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
2547         inp->next_addr_touse = starting_point;
2548         resettotop = 0;
2549 once_again_too:
2550         if (inp->next_addr_touse == NULL) {
2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552                 resettotop = 1;
2553         }
2554
2555         /* ok, what about an acceptable address in the inp */
2556         for (laddr = inp->next_addr_touse; laddr;
2557             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2558                 if (laddr->ifa == NULL) {
2559                         /* address has been removed */
2560                         continue;
2561                 }
2562                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2563                         /* address is being deleted */
2564                         continue;
2565                 }
2566                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2567                     dest_is_priv, fam);
2568                 if (sifa == NULL)
2569                         continue;
2570                 atomic_add_int(&sifa->refcount, 1);
2571                 return (sifa);
2572         }
2573         if (resettotop == 0) {
2574                 inp->next_addr_touse = NULL;
2575                 goto once_again_too;
2576         }
2577
2578         /*
2579          * no address bound can be a source for the destination we are in
2580          * trouble
2581          */
2582         return (NULL);
2583 }
2584
2585
2586
2587 static struct sctp_ifa *
2588 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2589     struct sctp_tcb *stcb,
2590     sctp_route_t *ro,
2591     uint32_t vrf_id,
2592     uint8_t dest_is_priv,
2593     uint8_t dest_is_loop,
2594     int non_asoc_addr_ok,
2595     sa_family_t fam)
2596 {
2597         struct sctp_laddr *laddr, *starting_point;
2598         void *ifn;
2599         struct sctp_ifn *sctp_ifn;
2600         struct sctp_ifa *sctp_ifa, *sifa;
2601         uint8_t start_at_beginning = 0;
2602         struct sctp_vrf *vrf;
2603         uint32_t ifn_index;
2604
2605         /*
2606          * first question, is the ifn we will emit on in our list, if so, we
2607          * want that one.
2608          */
2609         vrf = sctp_find_vrf(vrf_id);
2610         if (vrf == NULL)
2611                 return (NULL);
2612
2613         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2614         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2615         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2616
2617         /*
2618          * first question, is the ifn we will emit on in our list?  If so,
2619          * we want that one. First we look for a preferred. Second, we go
2620          * for an acceptable.
2621          */
2622         if (sctp_ifn) {
2623                 /* first try for a preferred address on the ep */
2624                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2625 #ifdef INET
2626                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2627                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2628                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2629                                 continue;
2630                         }
2631 #endif
2632 #ifdef INET6
2633                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2634                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2635                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2636                                 continue;
2637                         }
2638 #endif
2639                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2640                                 continue;
2641                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2642                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2643                                 if (sifa == NULL)
2644                                         continue;
2645                                 if (((non_asoc_addr_ok == 0) &&
2646                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2647                                     (non_asoc_addr_ok &&
2648                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2649                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2650                                         /* on the no-no list */
2651                                         continue;
2652                                 }
2653                                 atomic_add_int(&sifa->refcount, 1);
2654                                 return (sifa);
2655                         }
2656                 }
2657                 /* next try for an acceptable address on the ep */
2658                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2659 #ifdef INET
2660                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2661                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2662                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2663                                 continue;
2664                         }
2665 #endif
2666 #ifdef INET6
2667                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2668                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2669                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2670                                 continue;
2671                         }
2672 #endif
2673                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2674                                 continue;
2675                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2676                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2677                                 if (sifa == NULL)
2678                                         continue;
2679                                 if (((non_asoc_addr_ok == 0) &&
2680                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2681                                     (non_asoc_addr_ok &&
2682                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2683                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2684                                         /* on the no-no list */
2685                                         continue;
2686                                 }
2687                                 atomic_add_int(&sifa->refcount, 1);
2688                                 return (sifa);
2689                         }
2690                 }
2691
2692         }
2693         /*
2694          * if we can't find one like that then we must look at all addresses
2695          * bound to pick one at first preferable then secondly acceptable.
2696          */
2697         starting_point = stcb->asoc.last_used_address;
2698 sctp_from_the_top:
2699         if (stcb->asoc.last_used_address == NULL) {
2700                 start_at_beginning = 1;
2701                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2702         }
2703         /* search beginning with the last used address */
2704         for (laddr = stcb->asoc.last_used_address; laddr;
2705             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2706                 if (laddr->ifa == NULL) {
2707                         /* address has been removed */
2708                         continue;
2709                 }
2710                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2711                         /* address is being deleted */
2712                         continue;
2713                 }
2714                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2715                 if (sifa == NULL)
2716                         continue;
2717                 if (((non_asoc_addr_ok == 0) &&
2718                     (sctp_is_addr_restricted(stcb, sifa))) ||
2719                     (non_asoc_addr_ok &&
2720                     (sctp_is_addr_restricted(stcb, sifa)) &&
2721                     (!sctp_is_addr_pending(stcb, sifa)))) {
2722                         /* on the no-no list */
2723                         continue;
2724                 }
2725                 stcb->asoc.last_used_address = laddr;
2726                 atomic_add_int(&sifa->refcount, 1);
2727                 return (sifa);
2728         }
2729         if (start_at_beginning == 0) {
2730                 stcb->asoc.last_used_address = NULL;
2731                 goto sctp_from_the_top;
2732         }
2733         /* now try for any higher scope than the destination */
2734         stcb->asoc.last_used_address = starting_point;
2735         start_at_beginning = 0;
2736 sctp_from_the_top2:
2737         if (stcb->asoc.last_used_address == NULL) {
2738                 start_at_beginning = 1;
2739                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2740         }
2741         /* search beginning with the last used address */
2742         for (laddr = stcb->asoc.last_used_address; laddr;
2743             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2744                 if (laddr->ifa == NULL) {
2745                         /* address has been removed */
2746                         continue;
2747                 }
2748                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2749                         /* address is being deleted */
2750                         continue;
2751                 }
2752                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2753                     dest_is_priv, fam);
2754                 if (sifa == NULL)
2755                         continue;
2756                 if (((non_asoc_addr_ok == 0) &&
2757                     (sctp_is_addr_restricted(stcb, sifa))) ||
2758                     (non_asoc_addr_ok &&
2759                     (sctp_is_addr_restricted(stcb, sifa)) &&
2760                     (!sctp_is_addr_pending(stcb, sifa)))) {
2761                         /* on the no-no list */
2762                         continue;
2763                 }
2764                 stcb->asoc.last_used_address = laddr;
2765                 atomic_add_int(&sifa->refcount, 1);
2766                 return (sifa);
2767         }
2768         if (start_at_beginning == 0) {
2769                 stcb->asoc.last_used_address = NULL;
2770                 goto sctp_from_the_top2;
2771         }
2772         return (NULL);
2773 }
2774
2775 static struct sctp_ifa *
2776 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2777     struct sctp_inpcb *inp,
2778     struct sctp_tcb *stcb,
2779     int non_asoc_addr_ok,
2780     uint8_t dest_is_loop,
2781     uint8_t dest_is_priv,
2782     int addr_wanted,
2783     sa_family_t fam,
2784     sctp_route_t *ro
2785 )
2786 {
2787         struct sctp_ifa *ifa, *sifa;
2788         int num_eligible_addr = 0;
2789 #ifdef INET6
2790         struct sockaddr_in6 sin6, lsa6;
2791
2792         if (fam == AF_INET6) {
2793                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2794                 (void)sa6_recoverscope(&sin6);
2795         }
2796 #endif                          /* INET6 */
2797         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2798 #ifdef INET
2799                 if ((ifa->address.sa.sa_family == AF_INET) &&
2800                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2801                     &ifa->address.sin.sin_addr) != 0)) {
2802                         continue;
2803                 }
2804 #endif
2805 #ifdef INET6
2806                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2807                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2808                     &ifa->address.sin6.sin6_addr) != 0)) {
2809                         continue;
2810                 }
2811 #endif
2812                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2813                     (non_asoc_addr_ok == 0))
2814                         continue;
2815                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2816                     dest_is_priv, fam);
2817                 if (sifa == NULL)
2818                         continue;
2819 #ifdef INET6
2820                 if (fam == AF_INET6 &&
2821                     dest_is_loop &&
2822                     sifa->src_is_loop && sifa->src_is_priv) {
2823                         /*
2824                          * don't allow fe80::1 to be a src on loop ::1, we
2825                          * don't list it to the peer so we will get an
2826                          * abort.
2827                          */
2828                         continue;
2829                 }
2830                 if (fam == AF_INET6 &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2832                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2833                         /*
2834                          * link-local <-> link-local must belong to the same
2835                          * scope.
2836                          */
2837                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2838                         (void)sa6_recoverscope(&lsa6);
2839                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2840                                 continue;
2841                         }
2842                 }
2843 #endif                          /* INET6 */
2844
2845                 /*
2846                  * Check if the IPv6 address matches to next-hop. In the
2847                  * mobile case, old IPv6 address may be not deleted from the
2848                  * interface. Then, the interface has previous and new
2849                  * addresses.  We should use one corresponding to the
2850                  * next-hop.  (by micchie)
2851                  */
2852 #ifdef INET6
2853                 if (stcb && fam == AF_INET6 &&
2854                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2855                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2856                             == 0) {
2857                                 continue;
2858                         }
2859                 }
2860 #endif
2861 #ifdef INET
2862                 /* Avoid topologically incorrect IPv4 address */
2863                 if (stcb && fam == AF_INET &&
2864                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2865                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2866                                 continue;
2867                         }
2868                 }
2869 #endif
2870                 if (stcb) {
2871                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2872                                 continue;
2873                         }
2874                         if (((non_asoc_addr_ok == 0) &&
2875                             (sctp_is_addr_restricted(stcb, sifa))) ||
2876                             (non_asoc_addr_ok &&
2877                             (sctp_is_addr_restricted(stcb, sifa)) &&
2878                             (!sctp_is_addr_pending(stcb, sifa)))) {
2879                                 /*
2880                                  * It is restricted for some reason..
2881                                  * probably not yet added.
2882                                  */
2883                                 continue;
2884                         }
2885                 }
2886                 if (num_eligible_addr >= addr_wanted) {
2887                         return (sifa);
2888                 }
2889                 num_eligible_addr++;
2890         }
2891         return (NULL);
2892 }
2893
2894
2895 static int
2896 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2897     struct sctp_inpcb *inp,
2898     struct sctp_tcb *stcb,
2899     int non_asoc_addr_ok,
2900     uint8_t dest_is_loop,
2901     uint8_t dest_is_priv,
2902     sa_family_t fam)
2903 {
2904         struct sctp_ifa *ifa, *sifa;
2905         int num_eligible_addr = 0;
2906
2907         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2908 #ifdef INET
2909                 if ((ifa->address.sa.sa_family == AF_INET) &&
2910                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2911                     &ifa->address.sin.sin_addr) != 0)) {
2912                         continue;
2913                 }
2914 #endif
2915 #ifdef INET6
2916                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2917                     (stcb != NULL) &&
2918                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2919                     &ifa->address.sin6.sin6_addr) != 0)) {
2920                         continue;
2921                 }
2922 #endif
2923                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2924                     (non_asoc_addr_ok == 0)) {
2925                         continue;
2926                 }
2927                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2928                     dest_is_priv, fam);
2929                 if (sifa == NULL) {
2930                         continue;
2931                 }
2932                 if (stcb) {
2933                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2934                                 continue;
2935                         }
2936                         if (((non_asoc_addr_ok == 0) &&
2937                             (sctp_is_addr_restricted(stcb, sifa))) ||
2938                             (non_asoc_addr_ok &&
2939                             (sctp_is_addr_restricted(stcb, sifa)) &&
2940                             (!sctp_is_addr_pending(stcb, sifa)))) {
2941                                 /*
2942                                  * It is restricted for some reason..
2943                                  * probably not yet added.
2944                                  */
2945                                 continue;
2946                         }
2947                 }
2948                 num_eligible_addr++;
2949         }
2950         return (num_eligible_addr);
2951 }
2952
2953 static struct sctp_ifa *
2954 sctp_choose_boundall(struct sctp_inpcb *inp,
2955     struct sctp_tcb *stcb,
2956     struct sctp_nets *net,
2957     sctp_route_t *ro,
2958     uint32_t vrf_id,
2959     uint8_t dest_is_priv,
2960     uint8_t dest_is_loop,
2961     int non_asoc_addr_ok,
2962     sa_family_t fam)
2963 {
2964         int cur_addr_num = 0, num_preferred = 0;
2965         void *ifn;
2966         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2967         struct sctp_ifa *sctp_ifa, *sifa;
2968         uint32_t ifn_index;
2969         struct sctp_vrf *vrf;
2970 #ifdef INET
2971         int retried = 0;
2972 #endif
2973
2974         /*-
2975          * For boundall we can use any address in the association.
2976          * If non_asoc_addr_ok is set we can use any address (at least in
2977          * theory). So we look for preferred addresses first. If we find one,
2978          * we use it. Otherwise we next try to get an address on the
2979          * interface, which we should be able to do (unless non_asoc_addr_ok
2980          * is false and we are routed out that way). In these cases where we
2981          * can't use the address of the interface we go through all the
2982          * ifn's looking for an address we can use and fill that in. Punting
2983          * means we send back address 0, which will probably cause problems
2984          * actually since then IP will fill in the address of the route ifn,
2985          * which means we probably already rejected it.. i.e. here comes an
2986          * abort :-<.
2987          */
2988         vrf = sctp_find_vrf(vrf_id);
2989         if (vrf == NULL)
2990                 return (NULL);
2991
2992         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2993         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2994         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2995         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2996         if (sctp_ifn == NULL) {
2997                 /* ?? We don't have this guy ?? */
2998                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2999                 goto bound_all_plan_b;
3000         }
3001         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3002             ifn_index, sctp_ifn->ifn_name);
3003
3004         if (net) {
3005                 cur_addr_num = net->indx_of_eligible_next_to_use;
3006         }
3007         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3008             inp, stcb,
3009             non_asoc_addr_ok,
3010             dest_is_loop,
3011             dest_is_priv, fam);
3012         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3013             num_preferred, sctp_ifn->ifn_name);
3014         if (num_preferred == 0) {
3015                 /*
3016                  * no eligible addresses, we must use some other interface
3017                  * address if we can find one.
3018                  */
3019                 goto bound_all_plan_b;
3020         }
3021         /*
3022          * Ok we have num_eligible_addr set with how many we can use, this
3023          * may vary from call to call due to addresses being deprecated
3024          * etc..
3025          */
3026         if (cur_addr_num >= num_preferred) {
3027                 cur_addr_num = 0;
3028         }
3029         /*
3030          * select the nth address from the list (where cur_addr_num is the
3031          * nth) and 0 is the first one, 1 is the second one etc...
3032          */
3033         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3034
3035         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3036             dest_is_priv, cur_addr_num, fam, ro);
3037
3038         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3039         if (sctp_ifa) {
3040                 atomic_add_int(&sctp_ifa->refcount, 1);
3041                 if (net) {
3042                         /* save off where the next one we will want */
3043                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3044                 }
3045                 return (sctp_ifa);
3046         }
3047         /*
3048          * plan_b: Look at all interfaces and find a preferred address. If
3049          * no preferred fall through to plan_c.
3050          */
3051 bound_all_plan_b:
3052         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3053         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3054                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3055                     sctp_ifn->ifn_name);
3056                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3057                         /* wrong base scope */
3058                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3059                         continue;
3060                 }
3061                 if ((sctp_ifn == looked_at) && looked_at) {
3062                         /* already looked at this guy */
3063                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3064                         continue;
3065                 }
3066                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3067                     dest_is_loop, dest_is_priv, fam);
3068                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3069                     "Found ifn:%p %d preferred source addresses\n",
3070                     ifn, num_preferred);
3071                 if (num_preferred == 0) {
3072                         /* None on this interface. */
3073                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3074                         continue;
3075                 }
3076                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3077                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3078                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3079
3080                 /*
3081                  * Ok we have num_eligible_addr set with how many we can
3082                  * use, this may vary from call to call due to addresses
3083                  * being deprecated etc..
3084                  */
3085                 if (cur_addr_num >= num_preferred) {
3086                         cur_addr_num = 0;
3087                 }
3088                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3089                     dest_is_priv, cur_addr_num, fam, ro);
3090                 if (sifa == NULL)
3091                         continue;
3092                 if (net) {
3093                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3094                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3095                             cur_addr_num);
3096                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3097                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3098                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3099                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3100                 }
3101                 atomic_add_int(&sifa->refcount, 1);
3102                 return (sifa);
3103         }
3104 #ifdef INET
3105 again_with_private_addresses_allowed:
3106 #endif
3107         /* plan_c: do we have an acceptable address on the emit interface */
3108         sifa = NULL;
3109         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3110         if (emit_ifn == NULL) {
3111                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3112                 goto plan_d;
3113         }
3114         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3115                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3116 #ifdef INET
3117                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3118                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3119                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3120                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3121                         continue;
3122                 }
3123 #endif
3124 #ifdef INET6
3125                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3126                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3127                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3128                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3129                         continue;
3130                 }
3131 #endif
3132                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3133                     (non_asoc_addr_ok == 0)) {
3134                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3135                         continue;
3136                 }
3137                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3138                     dest_is_priv, fam);
3139                 if (sifa == NULL) {
3140                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3141                         continue;
3142                 }
3143                 if (stcb) {
3144                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3145                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3146                                 sifa = NULL;
3147                                 continue;
3148                         }
3149                         if (((non_asoc_addr_ok == 0) &&
3150                             (sctp_is_addr_restricted(stcb, sifa))) ||
3151                             (non_asoc_addr_ok &&
3152                             (sctp_is_addr_restricted(stcb, sifa)) &&
3153                             (!sctp_is_addr_pending(stcb, sifa)))) {
3154                                 /*
3155                                  * It is restricted for some reason..
3156                                  * probably not yet added.
3157                                  */
3158                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3159                                 sifa = NULL;
3160                                 continue;
3161                         }
3162                 }
3163                 atomic_add_int(&sifa->refcount, 1);
3164                 goto out;
3165         }
3166 plan_d:
3167         /*
3168          * plan_d: We are in trouble. No preferred address on the emit
3169          * interface. And not even a preferred address on all interfaces. Go
3170          * out and see if we can find an acceptable address somewhere
3171          * amongst all interfaces.
3172          */
3173         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3174         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3175                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3176                         /* wrong base scope */
3177                         continue;
3178                 }
3179                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3180 #ifdef INET
3181                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3182                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3183                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3184                                 continue;
3185                         }
3186 #endif
3187 #ifdef INET6
3188                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3189                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3190                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3191                                 continue;
3192                         }
3193 #endif
3194                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3195                             (non_asoc_addr_ok == 0))
3196                                 continue;
3197                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3198                             dest_is_loop,
3199                             dest_is_priv, fam);
3200                         if (sifa == NULL)
3201                                 continue;
3202                         if (stcb) {
3203                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3204                                         sifa = NULL;
3205                                         continue;
3206                                 }
3207                                 if (((non_asoc_addr_ok == 0) &&
3208                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3209                                     (non_asoc_addr_ok &&
3210                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3211                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3212                                         /*
3213                                          * It is restricted for some
3214                                          * reason.. probably not yet added.
3215                                          */
3216                                         sifa = NULL;
3217                                         continue;
3218                                 }
3219                         }
3220                         goto out;
3221                 }
3222         }
3223 #ifdef INET
3224         if (stcb) {
3225                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226                         stcb->asoc.scope.ipv4_local_scope = 1;
3227                         retried = 1;
3228                         goto again_with_private_addresses_allowed;
3229                 } else if (retried == 1) {
3230                         stcb->asoc.scope.ipv4_local_scope = 0;
3231                 }
3232         }
3233 #endif
3234 out:
3235 #ifdef INET
3236         if (sifa) {
3237                 if (retried == 1) {
3238                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3239                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3240                                         /* wrong base scope */
3241                                         continue;
3242                                 }
3243                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3244                                         struct sctp_ifa *tmp_sifa;
3245
3246 #ifdef INET
3247                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3248                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3249                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3250                                                 continue;
3251                                         }
3252 #endif
3253 #ifdef INET6
3254                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3255                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3256                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3257                                                 continue;
3258                                         }
3259 #endif
3260                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3261                                             (non_asoc_addr_ok == 0))
3262                                                 continue;
3263                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3264                                             dest_is_loop,
3265                                             dest_is_priv, fam);
3266                                         if (tmp_sifa == NULL) {
3267                                                 continue;
3268                                         }
3269                                         if (tmp_sifa == sifa) {
3270                                                 continue;
3271                                         }
3272                                         if (stcb) {
3273                                                 if (sctp_is_address_in_scope(tmp_sifa,
3274                                                     &stcb->asoc.scope, 0) == 0) {
3275                                                         continue;
3276                                                 }
3277                                                 if (((non_asoc_addr_ok == 0) &&
3278                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3279                                                     (non_asoc_addr_ok &&
3280                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3281                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3282                                                         /*
3283                                                          * It is restricted
3284                                                          * for some reason..
3285                                                          * probably not yet
3286                                                          * added.
3287                                                          */
3288                                                         continue;
3289                                                 }
3290                                         }
3291                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3292                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3293                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3294                                         }
3295                                 }
3296                         }
3297                 }
3298                 atomic_add_int(&sifa->refcount, 1);
3299         }
3300 #endif
3301         return (sifa);
3302 }
3303
3304
3305
3306 /* tcb may be NULL */
3307 struct sctp_ifa *
3308 sctp_source_address_selection(struct sctp_inpcb *inp,
3309     struct sctp_tcb *stcb,
3310     sctp_route_t *ro,
3311     struct sctp_nets *net,
3312     int non_asoc_addr_ok, uint32_t vrf_id)
3313 {
3314         struct sctp_ifa *answer;
3315         uint8_t dest_is_priv, dest_is_loop;
3316         sa_family_t fam;
3317 #ifdef INET
3318         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319 #endif
3320 #ifdef INET6
3321         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3322 #endif
3323
3324         /**
3325          * Rules:
3326          * - Find the route if needed, cache if I can.
3327          * - Look at interface address in route, Is it in the bound list. If so we
3328          *   have the best source.
3329          * - If not we must rotate amongst the addresses.
3330          *
3331          * Cavets and issues
3332          *
3333          * Do we need to pay attention to scope. We can have a private address
3334          * or a global address we are sourcing or sending to. So if we draw
3335          * it out
3336          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3337          * For V4
3338          * ------------------------------------------
3339          *      source     *      dest  *  result
3340          * -----------------------------------------
3341          * <a>  Private    *    Global  *  NAT
3342          * -----------------------------------------
3343          * <b>  Private    *    Private *  No problem
3344          * -----------------------------------------
3345          * <c>  Global     *    Private *  Huh, How will this work?
3346          * -----------------------------------------
3347          * <d>  Global     *    Global  *  No Problem
3348          *------------------------------------------
3349          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3350          * For V6
3351          *------------------------------------------
3352          *      source     *      dest  *  result
3353          * -----------------------------------------
3354          * <a>  Linklocal  *    Global  *
3355          * -----------------------------------------
3356          * <b>  Linklocal  * Linklocal  *  No problem
3357          * -----------------------------------------
3358          * <c>  Global     * Linklocal  *  Huh, How will this work?
3359          * -----------------------------------------
3360          * <d>  Global     *    Global  *  No Problem
3361          *------------------------------------------
3362          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3363          *
3364          * And then we add to that what happens if there are multiple addresses
3365          * assigned to an interface. Remember the ifa on a ifn is a linked
3366          * list of addresses. So one interface can have more than one IP
3367          * address. What happens if we have both a private and a global
3368          * address? Do we then use context of destination to sort out which
3369          * one is best? And what about NAT's sending P->G may get you a NAT
3370          * translation, or should you select the G thats on the interface in
3371          * preference.
3372          *
3373          * Decisions:
3374          *
3375          * - count the number of addresses on the interface.
3376          * - if it is one, no problem except case <c>.
3377          *   For <a> we will assume a NAT out there.
3378          * - if there are more than one, then we need to worry about scope P
3379          *   or G. We should prefer G -> G and P -> P if possible.
3380          *   Then as a secondary fall back to mixed types G->P being a last
3381          *   ditch one.
3382          * - The above all works for bound all, but bound specific we need to
3383          *   use the same concept but instead only consider the bound
3384          *   addresses. If the bound set is NOT assigned to the interface then
3385          *   we must use rotation amongst the bound addresses..
3386          */
3387         if (ro->ro_rt == NULL) {
3388                 /*
3389                  * Need a route to cache.
3390                  */
3391                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3392         }
3393         if (ro->ro_rt == NULL) {
3394                 return (NULL);
3395         }
3396         fam = ro->ro_dst.sa_family;
3397         dest_is_priv = dest_is_loop = 0;
3398         /* Setup our scopes for the destination */
3399         switch (fam) {
3400 #ifdef INET
3401         case AF_INET:
3402                 /* Scope based on outbound address */
3403                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3404                         dest_is_loop = 1;
3405                         if (net != NULL) {
3406                                 /* mark it as local */
3407                                 net->addr_is_local = 1;
3408                         }
3409                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3410                         dest_is_priv = 1;
3411                 }
3412                 break;
3413 #endif
3414 #ifdef INET6
3415         case AF_INET6:
3416                 /* Scope based on outbound address */
3417                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3418                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3419                         /*
3420                          * If the address is a loopback address, which
3421                          * consists of "::1" OR "fe80::1%lo0", we are
3422                          * loopback scope. But we don't use dest_is_priv
3423                          * (link local addresses).
3424                          */
3425                         dest_is_loop = 1;
3426                         if (net != NULL) {
3427                                 /* mark it as local */
3428                                 net->addr_is_local = 1;
3429                         }
3430                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3431                         dest_is_priv = 1;
3432                 }
3433                 break;
3434 #endif
3435         }
3436         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3437         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3438         SCTP_IPI_ADDR_RLOCK();
3439         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3440                 /*
3441                  * Bound all case
3442                  */
3443                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3444                     dest_is_priv, dest_is_loop,
3445                     non_asoc_addr_ok, fam);
3446                 SCTP_IPI_ADDR_RUNLOCK();
3447                 return (answer);
3448         }
3449         /*
3450          * Subset bound case
3451          */
3452         if (stcb) {
3453                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3454                     vrf_id, dest_is_priv,
3455                     dest_is_loop,
3456                     non_asoc_addr_ok, fam);
3457         } else {
3458                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3459                     non_asoc_addr_ok,
3460                     dest_is_priv,
3461                     dest_is_loop, fam);
3462         }
3463         SCTP_IPI_ADDR_RUNLOCK();
3464         return (answer);
3465 }
3466
3467 static int
3468 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3469 {
3470         struct cmsghdr cmh;
3471         struct sctp_sndinfo sndinfo;
3472         struct sctp_prinfo prinfo;
3473         struct sctp_authinfo authinfo;
3474         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3475         int found;
3476
3477         /*
3478          * Independent of how many mbufs, find the c_type inside the control
3479          * structure and copy out the data.
3480          */
3481         found = 0;
3482         tot_len = SCTP_BUF_LEN(control);
3483         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3484                 rem_len = tot_len - off;
3485                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3486                         /* There is not enough room for one more. */
3487                         return (found);
3488                 }
3489                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3490                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491                         /* We dont't have a complete CMSG header. */
3492                         return (found);
3493                 }
3494                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3495                         /* We don't have the complete CMSG. */
3496                         return (found);
3497                 }
3498                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3499                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3500                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3501                     ((c_type == cmh.cmsg_type) ||
3502                     ((c_type == SCTP_SNDRCV) &&
3503                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3504                     (cmh.cmsg_type == SCTP_PRINFO) ||
3505                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3506                         if (c_type == cmh.cmsg_type) {
3507                                 if (cpsize > INT_MAX) {
3508                                         return (found);
3509                                 }
3510                                 if (cmsg_data_len < (int)cpsize) {
3511                                         return (found);
3512                                 }
3513                                 /* It is exactly what we want. Copy it out. */
3514                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3515                                 return (1);
3516                         } else {
3517                                 struct sctp_sndrcvinfo *sndrcvinfo;
3518
3519                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3520                                 if (found == 0) {
3521                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3522                                                 return (found);
3523                                         }
3524                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3525                                 }
3526                                 switch (cmh.cmsg_type) {
3527                                 case SCTP_SNDINFO:
3528                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3529                                                 return (found);
3530                                         }
3531                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3532                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3533                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3534                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3535                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3536                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3537                                         break;
3538                                 case SCTP_PRINFO:
3539                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3540                                                 return (found);
3541                                         }
3542                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3543                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3544                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3545                                         } else {
3546                                                 sndrcvinfo->sinfo_timetolive = 0;
3547                                         }
3548                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3549                                         break;
3550                                 case SCTP_AUTHINFO:
3551                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3552                                                 return (found);
3553                                         }
3554                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3555                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3556                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3557                                         break;
3558                                 default:
3559                                         return (found);
3560                                 }
3561                                 found = 1;
3562                         }
3563                 }
3564         }
3565         return (found);
3566 }
3567
3568 static int
3569 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3570 {
3571         struct cmsghdr cmh;
3572         struct sctp_initmsg initmsg;
3573 #ifdef INET
3574         struct sockaddr_in sin;
3575 #endif
3576 #ifdef INET6
3577         struct sockaddr_in6 sin6;
3578 #endif
3579         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3580
3581         tot_len = SCTP_BUF_LEN(control);
3582         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3583                 rem_len = tot_len - off;
3584                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3585                         /* There is not enough room for one more. */
3586                         *error = EINVAL;
3587                         return (1);
3588                 }
3589                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3590                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3591                         /* We dont't have a complete CMSG header. */
3592                         *error = EINVAL;
3593                         return (1);
3594                 }
3595                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3596                         /* We don't have the complete CMSG. */
3597                         *error = EINVAL;
3598                         return (1);
3599                 }
3600                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3601                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604                         case SCTP_INIT:
3605                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3606                                         *error = EINVAL;
3607                                         return (1);
3608                                 }
3609                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3610                                 if (initmsg.sinit_max_attempts)
3611                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3612                                 if (initmsg.sinit_num_ostreams)
3613                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3614                                 if (initmsg.sinit_max_instreams)
3615                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3616                                 if (initmsg.sinit_max_init_timeo)
3617                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3618                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3619                                         struct sctp_stream_out *tmp_str;
3620                                         unsigned int i;
3621 #if defined(SCTP_DETAILED_STR_STATS)
3622                                         int j;
3623 #endif
3624
3625                                         /* Default is NOT correct */
3626                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3627                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3628                                         SCTP_TCB_UNLOCK(stcb);
3629                                         SCTP_MALLOC(tmp_str,
3630                                             struct sctp_stream_out *,
3631                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3632                                             SCTP_M_STRMO);
3633                                         SCTP_TCB_LOCK(stcb);
3634                                         if (tmp_str != NULL) {
3635                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3636                                                 stcb->asoc.strmout = tmp_str;
3637                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3638                                         } else {
3639                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3640                                         }
3641                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3642                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3643                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3644                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3645                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3646 #if defined(SCTP_DETAILED_STR_STATS)
3647                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650                                                 }
3651 #else
3652                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654 #endif
3655                                                 stcb->asoc.strmout[i].sid = i;
3656                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3658                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3659                                         }
3660                                 }
3661                                 break;
3662 #ifdef INET
3663                         case SCTP_DSTADDRV4:
3664                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3665                                         *error = EINVAL;
3666                                         return (1);
3667                                 }
3668                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3669                                 sin.sin_family = AF_INET;
3670                                 sin.sin_len = sizeof(struct sockaddr_in);
3671                                 sin.sin_port = stcb->rport;
3672                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3673                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3674                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3675                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3676                                         *error = EINVAL;
3677                                         return (1);
3678                                 }
3679                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3680                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3681                                         *error = ENOBUFS;
3682                                         return (1);
3683                                 }
3684                                 break;
3685 #endif
3686 #ifdef INET6
3687                         case SCTP_DSTADDRV6:
3688                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3693                                 sin6.sin6_family = AF_INET6;
3694                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3695                                 sin6.sin6_port = stcb->rport;
3696                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3697                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3698                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3699                                         *error = EINVAL;
3700                                         return (1);
3701                                 }
3702 #ifdef INET
3703                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3704                                         in6_sin6_2_sin(&sin, &sin6);
3705                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3706                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3707                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3708                                                 *error = EINVAL;
3709                                                 return (1);
3710                                         }
3711                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3712                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3713                                                 *error = ENOBUFS;
3714                                                 return (1);
3715                                         }
3716                                 } else
3717 #endif
3718                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3719                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3720                                         *error = ENOBUFS;
3721                                         return (1);
3722                                 }
3723                                 break;
3724 #endif
3725                         default:
3726                                 break;
3727                         }
3728                 }
3729         }
3730         return (0);
3731 }
3732
3733 static struct sctp_tcb *
3734 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3735     uint16_t port,
3736     struct mbuf *control,
3737     struct sctp_nets **net_p,
3738     int *error)
3739 {
3740         struct cmsghdr cmh;
3741         struct sctp_tcb *stcb;
3742         struct sockaddr *addr;
3743 #ifdef INET
3744         struct sockaddr_in sin;
3745 #endif
3746 #ifdef INET6
3747         struct sockaddr_in6 sin6;
3748 #endif
3749         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3750
3751         tot_len = SCTP_BUF_LEN(control);
3752         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3753                 rem_len = tot_len - off;
3754                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3755                         /* There is not enough room for one more. */
3756                         *error = EINVAL;
3757                         return (NULL);
3758                 }
3759                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3760                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3761                         /* We dont't have a complete CMSG header. */
3762                         *error = EINVAL;
3763                         return (NULL);
3764                 }
3765                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3766                         /* We don't have the complete CMSG. */
3767                         *error = EINVAL;
3768                         return (NULL);
3769                 }
3770                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3771                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3772                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3773                         switch (cmh.cmsg_type) {
3774 #ifdef INET
3775                         case SCTP_DSTADDRV4:
3776                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3777                                         *error = EINVAL;
3778                                         return (NULL);
3779                                 }
3780                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3781                                 sin.sin_family = AF_INET;
3782                                 sin.sin_len = sizeof(struct sockaddr_in);
3783                                 sin.sin_port = port;
3784                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3785                                 addr = (struct sockaddr *)&sin;
3786                                 break;
3787 #endif
3788 #ifdef INET6
3789                         case SCTP_DSTADDRV6:
3790                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3791                                         *error = EINVAL;
3792                                         return (NULL);
3793                                 }
3794                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3795                                 sin6.sin6_family = AF_INET6;
3796                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3797                                 sin6.sin6_port = port;
3798                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3799 #ifdef INET
3800                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3801                                         in6_sin6_2_sin(&sin, &sin6);
3802                                         addr = (struct sockaddr *)&sin;
3803                                 } else
3804 #endif
3805                                         addr = (struct sockaddr *)&sin6;
3806                                 break;
3807 #endif
3808                         default:
3809                                 addr = NULL;
3810                                 break;
3811                         }
3812                         if (addr) {
3813                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3814                                 if (stcb != NULL) {
3815                                         return (stcb);
3816                                 }
3817                         }
3818                 }
3819         }
3820         return (NULL);
3821 }
3822
3823 static struct mbuf *
3824 sctp_add_cookie(struct mbuf *init, int init_offset,
3825     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3826 {
3827         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3828         struct sctp_state_cookie *stc;
3829         struct sctp_paramhdr *ph;
3830         uint8_t *foo;
3831         int sig_offset;
3832         uint16_t cookie_sz;
3833
3834         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3835             sizeof(struct sctp_paramhdr)), 0,
3836             M_NOWAIT, 1, MT_DATA);
3837         if (mret == NULL) {
3838                 return (NULL);
3839         }
3840         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3841         if (copy_init == NULL) {
3842                 sctp_m_freem(mret);
3843                 return (NULL);
3844         }
3845 #ifdef SCTP_MBUF_LOGGING
3846         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3847                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3848         }
3849 #endif
3850         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3851             M_NOWAIT);
3852         if (copy_initack == NULL) {
3853                 sctp_m_freem(mret);
3854                 sctp_m_freem(copy_init);
3855                 return (NULL);
3856         }
3857 #ifdef SCTP_MBUF_LOGGING
3858         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3859                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3860         }
3861 #endif
3862         /* easy side we just drop it on the end */
3863         ph = mtod(mret, struct sctp_paramhdr *);
3864         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865             sizeof(struct sctp_paramhdr);
3866         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867             sizeof(struct sctp_paramhdr));
3868         ph->param_type = htons(SCTP_STATE_COOKIE);
3869         ph->param_length = 0;   /* fill in at the end */
3870         /* Fill in the stc cookie data */
3871         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873         /* tack the INIT and then the INIT-ACK onto the chain */
3874         cookie_sz = 0;
3875         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876                 cookie_sz += SCTP_BUF_LEN(m_at);
3877                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3878                         SCTP_BUF_NEXT(m_at) = copy_init;
3879                         break;
3880                 }
3881         }
3882         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883                 cookie_sz += SCTP_BUF_LEN(m_at);
3884                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3885                         SCTP_BUF_NEXT(m_at) = copy_initack;
3886                         break;
3887                 }
3888         }
3889         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890                 cookie_sz += SCTP_BUF_LEN(m_at);
3891                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3892                         break;
3893                 }
3894         }
3895         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896         if (sig == NULL) {
3897                 /* no space, so free the entire chain */
3898                 sctp_m_freem(mret);
3899                 return (NULL);
3900         }
3901         SCTP_BUF_LEN(sig) = 0;
3902         SCTP_BUF_NEXT(m_at) = sig;
3903         sig_offset = 0;
3904         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3905         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906         *signature = foo;
3907         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908         cookie_sz += SCTP_SIGNATURE_SIZE;
3909         ph->param_length = htons(cookie_sz);
3910         return (mret);
3911 }
3912
3913
3914 static uint8_t
3915 sctp_get_ect(struct sctp_tcb *stcb)
3916 {
3917         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3918                 return (SCTP_ECT0_BIT);
3919         } else {
3920                 return (0);
3921         }
3922 }
3923
3924 #if defined(INET) || defined(INET6)
3925 static void
3926 sctp_handle_no_route(struct sctp_tcb *stcb,
3927     struct sctp_nets *net,
3928     int so_locked)
3929 {
3930         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3931
3932         if (net) {
3933                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3934                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3935                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3936                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3937                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3938                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3939                                     stcb, 0,
3940                                     (void *)net,
3941                                     so_locked);
3942                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3943                                 net->dest_state &= ~SCTP_ADDR_PF;
3944                         }
3945                 }
3946                 if (stcb) {
3947                         if (net == stcb->asoc.primary_destination) {
3948                                 /* need a new primary */
3949                                 struct sctp_nets *alt;
3950
3951                                 alt = sctp_find_alternate_net(stcb, net, 0);
3952                                 if (alt != net) {
3953                                         if (stcb->asoc.alternate) {
3954                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3955                                         }
3956                                         stcb->asoc.alternate = alt;
3957                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3958                                         if (net->ro._s_addr) {
3959                                                 sctp_free_ifa(net->ro._s_addr);
3960                                                 net->ro._s_addr = NULL;
3961                                         }
3962                                         net->src_addr_selected = 0;
3963                                 }
3964                         }
3965                 }
3966         }
3967 }
3968 #endif
3969
3970 static int
3971 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3972     struct sctp_tcb *stcb,      /* may be NULL */
3973     struct sctp_nets *net,
3974     struct sockaddr *to,
3975     struct mbuf *m,
3976     uint32_t auth_offset,
3977     struct sctp_auth_chunk *auth,
3978     uint16_t auth_keyid,
3979     int nofragment_flag,
3980     int ecn_ok,
3981     int out_of_asoc_ok,
3982     uint16_t src_port,
3983     uint16_t dest_port,
3984     uint32_t v_tag,
3985     uint16_t port,
3986     union sctp_sockstore *over_addr,
3987     uint8_t mflowtype, uint32_t mflowid,
3988 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3989     int so_locked SCTP_UNUSED
3990 #else
3991     int so_locked
3992 #endif
3993 )
3994 {
3995 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3996         /**
3997          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3998          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3999          * - fill in the HMAC digest of any AUTH chunk in the packet.
4000          * - calculate and fill in the SCTP checksum.
4001          * - prepend an IP address header.
4002          * - if boundall use INADDR_ANY.
4003          * - if boundspecific do source address selection.
4004          * - set fragmentation option for ipV4.
4005          * - On return from IP output, check/adjust mtu size of output
4006          *   interface and smallest_mtu size as well.
4007          */
4008         /* Will need ifdefs around this */
4009         struct mbuf *newm;
4010         struct sctphdr *sctphdr;
4011         int packet_length;
4012         int ret;
4013 #if defined(INET) || defined(INET6)
4014         uint32_t vrf_id;
4015 #endif
4016 #if defined(INET) || defined(INET6)
4017         struct mbuf *o_pak;
4018         sctp_route_t *ro = NULL;
4019         struct udphdr *udp = NULL;
4020 #endif
4021         uint8_t tos_value;
4022 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4023         struct socket *so = NULL;
4024 #endif
4025
4026         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4027                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4028                 sctp_m_freem(m);
4029                 return (EFAULT);
4030         }
4031 #if defined(INET) || defined(INET6)
4032         if (stcb) {
4033                 vrf_id = stcb->asoc.vrf_id;
4034         } else {
4035                 vrf_id = inp->def_vrf_id;
4036         }
4037 #endif
4038         /* fill in the HMAC digest for any AUTH chunk in the packet */
4039         if ((auth != NULL) && (stcb != NULL)) {
4040                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4041         }
4042
4043         if (net) {
4044                 tos_value = net->dscp;
4045         } else if (stcb) {
4046                 tos_value = stcb->asoc.default_dscp;
4047         } else {
4048                 tos_value = inp->sctp_ep.default_dscp;
4049         }
4050
4051         switch (to->sa_family) {
4052 #ifdef INET
4053         case AF_INET:
4054                 {
4055                         struct ip *ip = NULL;
4056                         sctp_route_t iproute;
4057                         int len;
4058
4059                         len = SCTP_MIN_V4_OVERHEAD;
4060                         if (port) {
4061                                 len += sizeof(struct udphdr);
4062                         }
4063                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4064                         if (newm == NULL) {
4065                                 sctp_m_freem(m);
4066                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4067                                 return (ENOMEM);
4068                         }
4069                         SCTP_ALIGN_TO_END(newm, len);
4070                         SCTP_BUF_LEN(newm) = len;
4071                         SCTP_BUF_NEXT(newm) = m;
4072                         m = newm;
4073                         if (net != NULL) {
4074                                 m->m_pkthdr.flowid = net->flowid;
4075                                 M_HASHTYPE_SET(m, net->flowtype);
4076                         } else {
4077                                 m->m_pkthdr.flowid = mflowid;
4078                                 M_HASHTYPE_SET(m, mflowtype);
4079                         }
4080                         packet_length = sctp_calculate_len(m);
4081                         ip = mtod(m, struct ip *);
4082                         ip->ip_v = IPVERSION;
4083                         ip->ip_hl = (sizeof(struct ip) >> 2);
4084                         if (tos_value == 0) {
4085                                 /*
4086                                  * This means especially, that it is not set
4087                                  * at the SCTP layer. So use the value from
4088                                  * the IP layer.
4089                                  */
4090                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4091                         }
4092                         tos_value &= 0xfc;
4093                         if (ecn_ok) {
4094                                 tos_value |= sctp_get_ect(stcb);
4095                         }
4096                         if ((nofragment_flag) && (port == 0)) {
4097                                 ip->ip_off = htons(IP_DF);
4098                         } else {
4099                                 ip->ip_off = htons(0);
4100                         }
4101                         /* FreeBSD has a function for ip_id's */
4102                         ip_fillid(ip);
4103
4104                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4105                         ip->ip_len = htons(packet_length);
4106                         ip->ip_tos = tos_value;
4107                         if (port) {
4108                                 ip->ip_p = IPPROTO_UDP;
4109                         } else {
4110                                 ip->ip_p = IPPROTO_SCTP;
4111                         }
4112                         ip->ip_sum = 0;
4113                         if (net == NULL) {
4114                                 ro = &iproute;
4115                                 memset(&iproute, 0, sizeof(iproute));
4116                                 memcpy(&ro->ro_dst, to, to->sa_len);
4117                         } else {
4118                                 ro = (sctp_route_t *)&net->ro;
4119                         }
4120                         /* Now the address selection part */
4121                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4122
4123                         /* call the routine to select the src address */
4124                         if (net && out_of_asoc_ok == 0) {
4125                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4126                                         sctp_free_ifa(net->ro._s_addr);
4127                                         net->ro._s_addr = NULL;
4128                                         net->src_addr_selected = 0;
4129                                         if (ro->ro_rt) {
4130                                                 RTFREE(ro->ro_rt);
4131                                                 ro->ro_rt = NULL;
4132                                         }
4133                                 }
4134                                 if (net->src_addr_selected == 0) {
4135                                         /* Cache the source address */
4136                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4137                                             ro, net, 0,
4138                                             vrf_id);
4139                                         net->src_addr_selected = 1;
4140                                 }
4141                                 if (net->ro._s_addr == NULL) {
4142                                         /* No route to host */
4143                                         net->src_addr_selected = 0;
4144                                         sctp_handle_no_route(stcb, net, so_locked);
4145                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4146                                         sctp_m_freem(m);
4147                                         return (EHOSTUNREACH);
4148                                 }
4149                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4150                         } else {
4151                                 if (over_addr == NULL) {
4152                                         struct sctp_ifa *_lsrc;
4153
4154                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4155                                             net,
4156                                             out_of_asoc_ok,
4157                                             vrf_id);
4158                                         if (_lsrc == NULL) {
4159                                                 sctp_handle_no_route(stcb, net, so_locked);
4160                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4161                                                 sctp_m_freem(m);
4162                                                 return (EHOSTUNREACH);
4163                                         }
4164                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4165                                         sctp_free_ifa(_lsrc);
4166                                 } else {
4167                                         ip->ip_src = over_addr->sin.sin_addr;
4168                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4169                                 }
4170                         }
4171                         if (port) {
4172                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4173                                         sctp_handle_no_route(stcb, net, so_locked);
4174                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4175                                         sctp_m_freem(m);
4176                                         return (EHOSTUNREACH);
4177                                 }
4178                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4179                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4180                                 udp->uh_dport = port;
4181                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4182                                 if (V_udp_cksum) {
4183                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4184                                 } else {
4185                                         udp->uh_sum = 0;
4186                                 }
4187                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4188                         } else {
4189                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4190                         }
4191
4192                         sctphdr->src_port = src_port;
4193                         sctphdr->dest_port = dest_port;
4194                         sctphdr->v_tag = v_tag;
4195                         sctphdr->checksum = 0;
4196
4197                         /*
4198                          * If source address selection fails and we find no
4199                          * route then the ip_output should fail as well with
4200                          * a NO_ROUTE_TO_HOST type error. We probably should
4201                          * catch that somewhere and abort the association
4202                          * right away (assuming this is an INIT being sent).
4203                          */
4204                         if (ro->ro_rt == NULL) {
4205                                 /*
4206                                  * src addr selection failed to find a route
4207                                  * (or valid source addr), so we can't get
4208                                  * there from here (yet)!
4209                                  */
4210                                 sctp_handle_no_route(stcb, net, so_locked);
4211                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4212                                 sctp_m_freem(m);
4213                                 return (EHOSTUNREACH);
4214                         }
4215                         if (ro != &iproute) {
4216                                 memcpy(&iproute, ro, sizeof(*ro));
4217                         }
4218                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4219                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4220                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4221                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4222                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4223                             (void *)ro->ro_rt);
4224
4225                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4226                                 /* failed to prepend data, give up */
4227                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4228                                 sctp_m_freem(m);
4229                                 return (ENOMEM);
4230                         }
4231                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4232                         if (port) {
4233                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4234                                 SCTP_STAT_INCR(sctps_sendswcrc);
4235                                 if (V_udp_cksum) {
4236                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4237                                 }
4238                         } else {
4239                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4240                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4241                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4242                         }
4243 #ifdef SCTP_PACKET_LOGGING
4244                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4245                                 sctp_packet_log(o_pak);
4246 #endif
4247                         /* send it out.  table id is taken from stcb */
4248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4249                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4250                                 so = SCTP_INP_SO(inp);
4251                                 SCTP_SOCKET_UNLOCK(so, 0);
4252                         }
4253 #endif
4254                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4256                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4257                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4258                                 SCTP_TCB_UNLOCK(stcb);
4259                                 SCTP_SOCKET_LOCK(so, 0);
4260                                 SCTP_TCB_LOCK(stcb);
4261                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4262                         }
4263 #endif
4264                         if (port) {
4265                                 UDPSTAT_INC(udps_opackets);
4266                         }
4267                         SCTP_STAT_INCR(sctps_sendpackets);
4268                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4269                         if (ret)
4270                                 SCTP_STAT_INCR(sctps_senderrors);
4271
4272                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4273                         if (net == NULL) {
4274                                 /* free tempy routes */
4275                                 RO_RTFREE(ro);
4276                         } else {
4277                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4278                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4279                                         uint32_t mtu;
4280
4281                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4282                                         if (mtu > 0) {
4283                                                 if (net->port) {
4284                                                         mtu -= sizeof(struct udphdr);
4285                                                 }
4286                                                 if (mtu < net->mtu) {
4287                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4288                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4289                                                         }
4290                                                         net->mtu = mtu;
4291                                                 }
4292                                         }
4293                                 } else if (ro->ro_rt == NULL) {
4294                                         /* route was freed */
4295                                         if (net->ro._s_addr &&
4296                                             net->src_addr_selected) {
4297                                                 sctp_free_ifa(net->ro._s_addr);
4298                                                 net->ro._s_addr = NULL;
4299                                         }
4300                                         net->src_addr_selected = 0;
4301                                 }
4302                         }
4303                         return (ret);
4304                 }
4305 #endif
4306 #ifdef INET6
4307         case AF_INET6:
4308                 {
4309                         uint32_t flowlabel, flowinfo;
4310                         struct ip6_hdr *ip6h;
4311                         struct route_in6 ip6route;
4312                         struct ifnet *ifp;
4313                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4314                         int prev_scope = 0;
4315                         struct sockaddr_in6 lsa6_storage;
4316                         int error;
4317                         u_short prev_port = 0;
4318                         int len;
4319
4320                         if (net) {
4321                                 flowlabel = net->flowlabel;
4322                         } else if (stcb) {
4323                                 flowlabel = stcb->asoc.default_flowlabel;
4324                         } else {
4325                                 flowlabel = inp->sctp_ep.default_flowlabel;
4326                         }
4327                         if (flowlabel == 0) {
4328                                 /*
4329                                  * This means especially, that it is not set
4330                                  * at the SCTP layer. So use the value from
4331                                  * the IP layer.
4332                                  */
4333                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4334                         }
4335                         flowlabel &= 0x000fffff;
4336                         len = SCTP_MIN_OVERHEAD;
4337                         if (port) {
4338                                 len += sizeof(struct udphdr);
4339                         }
4340                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4341                         if (newm == NULL) {
4342                                 sctp_m_freem(m);
4343                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4344                                 return (ENOMEM);
4345                         }
4346                         SCTP_ALIGN_TO_END(newm, len);
4347                         SCTP_BUF_LEN(newm) = len;
4348                         SCTP_BUF_NEXT(newm) = m;
4349                         m = newm;
4350                         if (net != NULL) {
4351                                 m->m_pkthdr.flowid = net->flowid;
4352                                 M_HASHTYPE_SET(m, net->flowtype);
4353                         } else {
4354                                 m->m_pkthdr.flowid = mflowid;
4355                                 M_HASHTYPE_SET(m, mflowtype);
4356                         }
4357                         packet_length = sctp_calculate_len(m);
4358
4359                         ip6h = mtod(m, struct ip6_hdr *);
4360                         /* protect *sin6 from overwrite */
4361                         sin6 = (struct sockaddr_in6 *)to;
4362                         tmp = *sin6;
4363                         sin6 = &tmp;
4364
4365                         /* KAME hack: embed scopeid */
4366                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4367                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4368                                 sctp_m_freem(m);
4369                                 return (EINVAL);
4370                         }
4371                         if (net == NULL) {
4372                                 memset(&ip6route, 0, sizeof(ip6route));
4373                                 ro = (sctp_route_t *)&ip6route;
4374                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4375                         } else {
4376                                 ro = (sctp_route_t *)&net->ro;
4377                         }
4378                         /*
4379                          * We assume here that inp_flow is in host byte
4380                          * order within the TCB!
4381                          */
4382                         if (tos_value == 0) {
4383                                 /*
4384                                  * This means especially, that it is not set
4385                                  * at the SCTP layer. So use the value from
4386                                  * the IP layer.
4387                                  */
4388                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4389                         }
4390                         tos_value &= 0xfc;
4391                         if (ecn_ok) {
4392                                 tos_value |= sctp_get_ect(stcb);
4393                         }
4394                         flowinfo = 0x06;
4395                         flowinfo <<= 8;
4396                         flowinfo |= tos_value;
4397                         flowinfo <<= 20;
4398                         flowinfo |= flowlabel;
4399                         ip6h->ip6_flow = htonl(flowinfo);
4400                         if (port) {
4401                                 ip6h->ip6_nxt = IPPROTO_UDP;
4402                         } else {
4403                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4404                         }
4405                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4406                         ip6h->ip6_dst = sin6->sin6_addr;
4407
4408                         /*
4409                          * Add SRC address selection here: we can only reuse
4410                          * to a limited degree the kame src-addr-sel, since
4411                          * we can try their selection but it may not be
4412                          * bound.
4413                          */
4414                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4415                         lsa6_tmp.sin6_family = AF_INET6;
4416                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4417                         lsa6 = &lsa6_tmp;
4418                         if (net && out_of_asoc_ok == 0) {
4419                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4420                                         sctp_free_ifa(net->ro._s_addr);
4421                                         net->ro._s_addr = NULL;
4422                                         net->src_addr_selected = 0;
4423                                         if (ro->ro_rt) {
4424                                                 RTFREE(ro->ro_rt);
4425                                                 ro->ro_rt = NULL;
4426                                         }
4427                                 }
4428                                 if (net->src_addr_selected == 0) {
4429                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4430                                         /* KAME hack: embed scopeid */
4431                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4432                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4433                                                 sctp_m_freem(m);
4434                                                 return (EINVAL);
4435                                         }
4436                                         /* Cache the source address */
4437                                         net->ro._s_addr = sctp_source_address_selection(inp,
4438                                             stcb,
4439                                             ro,
4440                                             net,
4441                                             0,
4442                                             vrf_id);
4443                                         (void)sa6_recoverscope(sin6);
4444                                         net->src_addr_selected = 1;
4445                                 }
4446                                 if (net->ro._s_addr == NULL) {
4447                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4448                                         net->src_addr_selected = 0;
4449                                         sctp_handle_no_route(stcb, net, so_locked);
4450                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4451                                         sctp_m_freem(m);
4452                                         return (EHOSTUNREACH);
4453                                 }
4454                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4455                         } else {
4456                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4457                                 /* KAME hack: embed scopeid */
4458                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4459                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4460                                         sctp_m_freem(m);
4461                                         return (EINVAL);
4462                                 }
4463                                 if (over_addr == NULL) {
4464                                         struct sctp_ifa *_lsrc;
4465
4466                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4467                                             net,
4468                                             out_of_asoc_ok,
4469                                             vrf_id);
4470                                         if (_lsrc == NULL) {
4471                                                 sctp_handle_no_route(stcb, net, so_locked);
4472                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4473                                                 sctp_m_freem(m);
4474                                                 return (EHOSTUNREACH);
4475                                         }
4476                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4477                                         sctp_free_ifa(_lsrc);
4478                                 } else {
4479                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4480                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4481                                 }
4482                                 (void)sa6_recoverscope(sin6);
4483                         }
4484                         lsa6->sin6_port = inp->sctp_lport;
4485
4486                         if (ro->ro_rt == NULL) {
4487                                 /*
4488                                  * src addr selection failed to find a route
4489                                  * (or valid source addr), so we can't get
4490                                  * there from here!
4491                                  */
4492                                 sctp_handle_no_route(stcb, net, so_locked);
4493                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4494                                 sctp_m_freem(m);
4495                                 return (EHOSTUNREACH);
4496                         }
4497                         /*
4498                          * XXX: sa6 may not have a valid sin6_scope_id in
4499                          * the non-SCOPEDROUTING case.
4500                          */
4501                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4502                         lsa6_storage.sin6_family = AF_INET6;
4503                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4504                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4505                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4506                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4507                                 sctp_m_freem(m);
4508                                 return (error);
4509                         }
4510                         /* XXX */
4511                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4512                         lsa6_storage.sin6_port = inp->sctp_lport;
4513                         lsa6 = &lsa6_storage;
4514                         ip6h->ip6_src = lsa6->sin6_addr;
4515
4516                         if (port) {
4517                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4518                                         sctp_handle_no_route(stcb, net, so_locked);
4519                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4520                                         sctp_m_freem(m);
4521                                         return (EHOSTUNREACH);
4522                                 }
4523                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4524                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4525                                 udp->uh_dport = port;
4526                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4527                                 udp->uh_sum = 0;
4528                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4529                         } else {
4530                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4531                         }
4532
4533                         sctphdr->src_port = src_port;
4534                         sctphdr->dest_port = dest_port;
4535                         sctphdr->v_tag = v_tag;
4536                         sctphdr->checksum = 0;
4537
4538                         /*
4539                          * We set the hop limit now since there is a good
4540                          * chance that our ro pointer is now filled
4541                          */
4542                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4543                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4544
4545 #ifdef SCTP_DEBUG
4546                         /* Copy to be sure something bad is not happening */
4547                         sin6->sin6_addr = ip6h->ip6_dst;
4548                         lsa6->sin6_addr = ip6h->ip6_src;
4549 #endif
4550
4551                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4552                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4553                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4554                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4555                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4556                         if (net) {
4557                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4558                                 /*
4559                                  * preserve the port and scope for link
4560                                  * local send
4561                                  */
4562                                 prev_scope = sin6->sin6_scope_id;
4563                                 prev_port = sin6->sin6_port;
4564                         }
4565
4566                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4567                                 /* failed to prepend data, give up */
4568                                 sctp_m_freem(m);
4569                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4570                                 return (ENOMEM);
4571                         }
4572                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4573                         if (port) {
4574                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4575                                 SCTP_STAT_INCR(sctps_sendswcrc);
4576                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4577                                         udp->uh_sum = 0xffff;
4578                                 }
4579                         } else {
4580                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4581                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4582                                 SCTP_STAT_INCR(sctps_sendhwcrc);
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                         if (port) {
4612                                 UDPSTAT_INC(udps_opackets);
4613                         }
4614                         SCTP_STAT_INCR(sctps_sendpackets);
4615                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4616                         if (ret) {
4617                                 SCTP_STAT_INCR(sctps_senderrors);
4618                         }
4619                         if (net == NULL) {
4620                                 /* Now if we had a temp route free it */
4621                                 RO_RTFREE(ro);
4622                         } else {
4623                                 /*
4624                                  * PMTU check versus smallest asoc MTU goes
4625                                  * here
4626                                  */
4627                                 if (ro->ro_rt == NULL) {
4628                                         /* Route was freed */
4629                                         if (net->ro._s_addr &&
4630                                             net->src_addr_selected) {
4631                                                 sctp_free_ifa(net->ro._s_addr);
4632                                                 net->ro._s_addr = NULL;
4633                                         }
4634                                         net->src_addr_selected = 0;
4635                                 }
4636                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4637                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4638                                         uint32_t mtu;
4639
4640                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4641                                         if (mtu > 0) {
4642                                                 if (net->port) {
4643                                                         mtu -= sizeof(struct udphdr);
4644                                                 }
4645                                                 if (mtu < net->mtu) {
4646                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4647                                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4648                                                         }
4649                                                         net->mtu = mtu;
4650                                                 }
4651                                         }
4652                                 } else if (ifp) {
4653                                         if (ND_IFINFO(ifp)->linkmtu &&
4654                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4655                                                 sctp_mtu_size_reset(inp,
4656                                                     &stcb->asoc,
4657                                                     ND_IFINFO(ifp)->linkmtu);
4658                                         }
4659                                 }
4660                         }
4661                         return (ret);
4662                 }
4663 #endif
4664         default:
4665                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4666                     ((struct sockaddr *)to)->sa_family);
4667                 sctp_m_freem(m);
4668                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4669                 return (EFAULT);
4670         }
4671 }
4672
4673
4674 void
4675 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4676 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4677     SCTP_UNUSED
4678 #endif
4679 )
4680 {
4681         struct mbuf *m, *m_last;
4682         struct sctp_nets *net;
4683         struct sctp_init_chunk *init;
4684         struct sctp_supported_addr_param *sup_addr;
4685         struct sctp_adaptation_layer_indication *ali;
4686         struct sctp_supported_chunk_types_param *pr_supported;
4687         struct sctp_paramhdr *ph;
4688         int cnt_inits_to = 0;
4689         int error;
4690         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4691
4692         /* INIT's always go to the primary (and usually ONLY address) */
4693         net = stcb->asoc.primary_destination;
4694         if (net == NULL) {
4695                 net = TAILQ_FIRST(&stcb->asoc.nets);
4696                 if (net == NULL) {
4697                         /* TSNH */
4698                         return;
4699                 }
4700                 /* we confirm any address we send an INIT to */
4701                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4702                 (void)sctp_set_primary_addr(stcb, NULL, net);
4703         } else {
4704                 /* we confirm any address we send an INIT to */
4705                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4706         }
4707         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4708 #ifdef INET6
4709         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4710                 /*
4711                  * special hook, if we are sending to link local it will not
4712                  * show up in our private address count.
4713                  */
4714                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4715                         cnt_inits_to = 1;
4716         }
4717 #endif
4718         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4719                 /* This case should not happen */
4720                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4721                 return;
4722         }
4723         /* start the INIT timer */
4724         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4725
4726         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4727         if (m == NULL) {
4728                 /* No memory, INIT timer will re-attempt. */
4729                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4730                 return;
4731         }
4732         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4733         padding_len = 0;
4734         /* Now lets put the chunk header in place */
4735         init = mtod(m, struct sctp_init_chunk *);
4736         /* now the chunk header */
4737         init->ch.chunk_type = SCTP_INITIATION;
4738         init->ch.chunk_flags = 0;
4739         /* fill in later from mbuf we build */
4740         init->ch.chunk_length = 0;
4741         /* place in my tag */
4742         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4743         /* set up some of the credits. */
4744         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4745             SCTP_MINIMAL_RWND));
4746         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4747         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4748         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4749
4750         /* Adaptation layer indication parameter */
4751         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4752                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4753                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4754                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4755                 ali->ph.param_length = htons(parameter_len);
4756                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4757                 chunk_len += parameter_len;
4758         }
4759
4760         /* ECN parameter */
4761         if (stcb->asoc.ecn_supported == 1) {
4762                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4763                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4764                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4765                 ph->param_length = htons(parameter_len);
4766                 chunk_len += parameter_len;
4767         }
4768
4769         /* PR-SCTP supported parameter */
4770         if (stcb->asoc.prsctp_supported == 1) {
4771                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4772                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4773                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4774                 ph->param_length = htons(parameter_len);
4775                 chunk_len += parameter_len;
4776         }
4777
4778         /* Add NAT friendly parameter. */
4779         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4780                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4781                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4782                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4783                 ph->param_length = htons(parameter_len);
4784                 chunk_len += parameter_len;
4785         }
4786
4787         /* And now tell the peer which extensions we support */
4788         num_ext = 0;
4789         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4790         if (stcb->asoc.prsctp_supported == 1) {
4791                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4792                 if (stcb->asoc.idata_supported) {
4793                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4794                 }
4795         }
4796         if (stcb->asoc.auth_supported == 1) {
4797                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4798         }
4799         if (stcb->asoc.asconf_supported == 1) {
4800                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4801                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4802         }
4803         if (stcb->asoc.reconfig_supported == 1) {
4804                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4805         }
4806         if (stcb->asoc.idata_supported) {
4807                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4808         }
4809         if (stcb->asoc.nrsack_supported == 1) {
4810                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4811         }
4812         if (stcb->asoc.pktdrop_supported == 1) {
4813                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4814         }
4815         if (num_ext > 0) {
4816                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4817                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4818                 pr_supported->ph.param_length = htons(parameter_len);
4819                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4820                 chunk_len += parameter_len;
4821         }
4822         /* add authentication parameters */
4823         if (stcb->asoc.auth_supported) {
4824                 /* attach RANDOM parameter, if available */
4825                 if (stcb->asoc.authinfo.random != NULL) {
4826                         struct sctp_auth_random *randp;
4827
4828                         if (padding_len > 0) {
4829                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4830                                 chunk_len += padding_len;
4831                                 padding_len = 0;
4832                         }
4833                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4834                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4835                         /* random key already contains the header */
4836                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4837                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4838                         chunk_len += parameter_len;
4839                 }
4840                 /* add HMAC_ALGO parameter */
4841                 if (stcb->asoc.local_hmacs != NULL) {
4842                         struct sctp_auth_hmac_algo *hmacs;
4843
4844                         if (padding_len > 0) {
4845                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4846                                 chunk_len += padding_len;
4847                                 padding_len = 0;
4848                         }
4849                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4850                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4851                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4852                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4853                         hmacs->ph.param_length = htons(parameter_len);
4854                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4855                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4856                         chunk_len += parameter_len;
4857                 }
4858                 /* add CHUNKS parameter */
4859                 if (stcb->asoc.local_auth_chunks != NULL) {
4860                         struct sctp_auth_chunk_list *chunks;
4861
4862                         if (padding_len > 0) {
4863                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4864                                 chunk_len += padding_len;
4865                                 padding_len = 0;
4866                         }
4867                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4868                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4869                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4870                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4871                         chunks->ph.param_length = htons(parameter_len);
4872                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4873                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4874                         chunk_len += parameter_len;
4875                 }
4876         }
4877
4878         /* now any cookie time extensions */
4879         if (stcb->asoc.cookie_preserve_req) {
4880                 struct sctp_cookie_perserve_param *cookie_preserve;
4881
4882                 if (padding_len > 0) {
4883                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4884                         chunk_len += padding_len;
4885                         padding_len = 0;
4886                 }
4887                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4888                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4889                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4890                 cookie_preserve->ph.param_length = htons(parameter_len);
4891                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4892                 stcb->asoc.cookie_preserve_req = 0;
4893                 chunk_len += parameter_len;
4894         }
4895
4896         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4897                 uint8_t i;
4898
4899                 if (padding_len > 0) {
4900                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4901                         chunk_len += padding_len;
4902                         padding_len = 0;
4903                 }
4904                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4905                 if (stcb->asoc.scope.ipv4_addr_legal) {
4906                         parameter_len += (uint16_t)sizeof(uint16_t);
4907                 }
4908                 if (stcb->asoc.scope.ipv6_addr_legal) {
4909                         parameter_len += (uint16_t)sizeof(uint16_t);
4910                 }
4911                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4912                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4913                 sup_addr->ph.param_length = htons(parameter_len);
4914                 i = 0;
4915                 if (stcb->asoc.scope.ipv4_addr_legal) {
4916                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4917                 }
4918                 if (stcb->asoc.scope.ipv6_addr_legal) {
4919                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4920                 }
4921                 padding_len = 4 - 2 * i;
4922                 chunk_len += parameter_len;
4923         }
4924
4925         SCTP_BUF_LEN(m) = chunk_len;
4926         /* now the addresses */
4927         /*
4928          * To optimize this we could put the scoping stuff into a structure
4929          * and remove the individual uint8's from the assoc structure. Then
4930          * we could just sifa in the address within the stcb. But for now
4931          * this is a quick hack to get the address stuff teased apart.
4932          */
4933         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4934             m, cnt_inits_to,
4935             &padding_len, &chunk_len);
4936
4937         init->ch.chunk_length = htons(chunk_len);
4938         if (padding_len > 0) {
4939                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4940                         sctp_m_freem(m);
4941                         return;
4942                 }
4943         }
4944         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4945         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4946             (struct sockaddr *)&net->ro._l_addr,
4947             m, 0, NULL, 0, 0, 0, 0,
4948             inp->sctp_lport, stcb->rport, htonl(0),
4949             net->port, NULL,
4950             0, 0,
4951             so_locked))) {
4952                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4953                 if (error == ENOBUFS) {
4954                         stcb->asoc.ifp_had_enobuf = 1;
4955                         SCTP_STAT_INCR(sctps_lowlevelerr);
4956                 }
4957         } else {
4958                 stcb->asoc.ifp_had_enobuf = 0;
4959         }
4960         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4961         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4962 }
4963
4964 struct mbuf *
4965 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4966     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4967 {
4968         /*
4969          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4970          * being equal to the beginning of the params i.e. (iphlen +
4971          * sizeof(struct sctp_init_msg) parse through the parameters to the
4972          * end of the mbuf verifying that all parameters are known.
4973          *
4974          * For unknown parameters build and return a mbuf with
4975          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4976          * processing this chunk stop, and set *abort_processing to 1.
4977          *
4978          * By having param_offset be pre-set to where parameters begin it is
4979          * hoped that this routine may be reused in the future by new
4980          * features.
4981          */
4982         struct sctp_paramhdr *phdr, params;
4983
4984         struct mbuf *mat, *op_err;
4985         int at, limit, pad_needed;
4986         uint16_t ptype, plen, padded_size;
4987         int err_at;
4988
4989         *abort_processing = 0;
4990         mat = in_initpkt;
4991         err_at = 0;
4992         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4993         at = param_offset;
4994         op_err = NULL;
4995         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4996         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4997         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4998                 ptype = ntohs(phdr->param_type);
4999                 plen = ntohs(phdr->param_length);
5000                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5001                         /* wacked parameter */
5002                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5003                         goto invalid_size;
5004                 }
5005                 limit -= SCTP_SIZE32(plen);
5006                 /*-
5007                  * All parameters for all chunks that we know/understand are
5008                  * listed here. We process them other places and make
5009                  * appropriate stop actions per the upper bits. However this
5010                  * is the generic routine processor's can call to get back
5011                  * an operr.. to either incorporate (init-ack) or send.
5012                  */
5013                 padded_size = SCTP_SIZE32(plen);
5014                 switch (ptype) {
5015                         /* Param's with variable size */
5016                 case SCTP_HEARTBEAT_INFO:
5017                 case SCTP_STATE_COOKIE:
5018                 case SCTP_UNRECOG_PARAM:
5019                 case SCTP_ERROR_CAUSE_IND:
5020                         /* ok skip fwd */
5021                         at += padded_size;
5022                         break;
5023                         /* Param's with variable size within a range */
5024                 case SCTP_CHUNK_LIST:
5025                 case SCTP_SUPPORTED_CHUNK_EXT:
5026                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5028                                 goto invalid_size;
5029                         }
5030                         at += padded_size;
5031                         break;
5032                 case SCTP_SUPPORTED_ADDRTYPE:
5033                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5034                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5035                                 goto invalid_size;
5036                         }
5037                         at += padded_size;
5038                         break;
5039                 case SCTP_RANDOM:
5040                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                 case SCTP_SET_PRIM_ADDR:
5047                 case SCTP_DEL_IP_ADDRESS:
5048                 case SCTP_ADD_IP_ADDRESS:
5049                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5050                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5052                                 goto invalid_size;
5053                         }
5054                         at += padded_size;
5055                         break;
5056                         /* Param's with a fixed size */
5057                 case SCTP_IPV4_ADDRESS:
5058                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_IPV6_ADDRESS:
5065                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5066                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5067                                 goto invalid_size;
5068                         }
5069                         at += padded_size;
5070                         break;
5071                 case SCTP_COOKIE_PRESERVE:
5072                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_HAS_NAT_SUPPORT:
5079                         *nat_friendly = 1;
5080                         /* fall through */
5081                 case SCTP_PRSCTP_SUPPORTED:
5082                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5084                                 goto invalid_size;
5085                         }
5086                         at += padded_size;
5087                         break;
5088                 case SCTP_ECN_CAPABLE:
5089                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_ULP_ADAPTATION:
5096                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5097                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5098                                 goto invalid_size;
5099                         }
5100                         at += padded_size;
5101                         break;
5102                 case SCTP_SUCCESS_REPORT:
5103                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5105                                 goto invalid_size;
5106                         }
5107                         at += padded_size;
5108                         break;
5109                 case SCTP_HOSTNAME_ADDRESS:
5110                         {
5111                                 /* We can NOT handle HOST NAME addresses!! */
5112                                 int l_len;
5113
5114                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5115                                 *abort_processing = 1;
5116                                 if (op_err == NULL) {
5117                                         /* Ok need to try to get a mbuf */
5118 #ifdef INET6
5119                                         l_len = SCTP_MIN_OVERHEAD;
5120 #else
5121                                         l_len = SCTP_MIN_V4_OVERHEAD;
5122 #endif
5123                                         l_len += sizeof(struct sctp_chunkhdr);
5124                                         l_len += sizeof(struct sctp_gen_error_cause);
5125                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5126                                         if (op_err) {
5127                                                 SCTP_BUF_LEN(op_err) = 0;
5128                                                 /*
5129                                                  * Pre-reserve space for IP,
5130                                                  * SCTP, and chunk header.
5131                                                  */
5132 #ifdef INET6
5133                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5134 #else
5135                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5136 #endif
5137                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5138                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5139                                         }
5140                                 }
5141                                 if (op_err) {
5142                                         /* If we have space */
5143                                         struct sctp_gen_error_cause cause;
5144
5145                                         if (err_at % 4) {
5146                                                 uint32_t cpthis = 0;
5147
5148                                                 pad_needed = 4 - (err_at % 4);
5149                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5150                                                 err_at += pad_needed;
5151                                         }
5152                                         cause.code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5153                                         cause.length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5154                                         m_copyback(op_err, err_at, sizeof(struct sctp_gen_error_cause), (caddr_t)&cause);
5155                                         err_at += sizeof(struct sctp_gen_error_cause);
5156                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5157                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5158                                                 sctp_m_freem(op_err);
5159                                                 return (NULL);
5160                                         }
5161                                 }
5162                                 return (op_err);
5163                                 break;
5164                         }
5165                 default:
5166                         /*
5167                          * we do not recognize the parameter figure out what
5168                          * we do.
5169                          */
5170                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5171                         if ((ptype & 0x4000) == 0x4000) {
5172                                 /* Report bit is set?? */
5173                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5174                                 if (op_err == NULL) {
5175                                         int l_len;
5176
5177                                         /* Ok need to try to get an mbuf */
5178 #ifdef INET6
5179                                         l_len = SCTP_MIN_OVERHEAD;
5180 #else
5181                                         l_len = SCTP_MIN_V4_OVERHEAD;
5182 #endif
5183                                         l_len += sizeof(struct sctp_chunkhdr);
5184                                         l_len += sizeof(struct sctp_paramhdr);
5185                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5186                                         if (op_err) {
5187                                                 SCTP_BUF_LEN(op_err) = 0;
5188 #ifdef INET6
5189                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5190 #else
5191                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5192 #endif
5193                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5195                                         }
5196                                 }
5197                                 if (op_err) {
5198                                         /* If we have space */
5199                                         struct sctp_paramhdr s;
5200
5201                                         if (err_at % 4) {
5202                                                 uint32_t cpthis = 0;
5203
5204                                                 pad_needed = 4 - (err_at % 4);
5205                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5206                                                 err_at += pad_needed;
5207                                         }
5208                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5209                                         s.param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5210                                         m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)&s);
5211                                         err_at += sizeof(struct sctp_paramhdr);
5212                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5213                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
5214                                                 sctp_m_freem(op_err);
5215                                                 /*
5216                                                  * we are out of memory but
5217                                                  * we still need to have a
5218                                                  * look at what to do (the
5219                                                  * system is in trouble
5220                                                  * though).
5221                                                  */
5222                                                 op_err = NULL;
5223                                                 goto more_processing;
5224                                         }
5225                                         err_at += plen;
5226                                 }
5227                         }
5228         more_processing:
5229                         if ((ptype & 0x8000) == 0x0000) {
5230                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5231                                 return (op_err);
5232                         } else {
5233                                 /* skip this chunk and continue processing */
5234                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5235                                 at += SCTP_SIZE32(plen);
5236                         }
5237                         break;
5238
5239                 }
5240                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5241         }
5242         return (op_err);
5243 invalid_size:
5244         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5245         *abort_processing = 1;
5246         if ((op_err == NULL) && phdr) {
5247                 int l_len;
5248 #ifdef INET6
5249                 l_len = SCTP_MIN_OVERHEAD;
5250 #else
5251                 l_len = SCTP_MIN_V4_OVERHEAD;
5252 #endif
5253                 l_len += sizeof(struct sctp_chunkhdr);
5254                 l_len += (2 * sizeof(struct sctp_paramhdr));
5255                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5256                 if (op_err) {
5257                         SCTP_BUF_LEN(op_err) = 0;
5258 #ifdef INET6
5259                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5260 #else
5261                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5262 #endif
5263                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5264                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5265                 }
5266         }
5267         if ((op_err) && phdr) {
5268                 struct sctp_paramhdr s;
5269
5270                 if (err_at % 4) {
5271                         uint32_t cpthis = 0;
5272
5273                         pad_needed = 4 - (err_at % 4);
5274                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5275                         err_at += pad_needed;
5276                 }
5277                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5278                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5279                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5280                 err_at += sizeof(s);
5281                 /* Only copy back the p-hdr that caused the issue */
5282                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5283         }
5284         return (op_err);
5285 }
5286
5287 static int
5288 sctp_are_there_new_addresses(struct sctp_association *asoc,
5289     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5290 {
5291         /*
5292          * Given a INIT packet, look through the packet to verify that there
5293          * are NO new addresses. As we go through the parameters add reports
5294          * of any un-understood parameters that require an error.  Also we
5295          * must return (1) to drop the packet if we see a un-understood
5296          * parameter that tells us to drop the chunk.
5297          */
5298         struct sockaddr *sa_touse;
5299         struct sockaddr *sa;
5300         struct sctp_paramhdr *phdr, params;
5301         uint16_t ptype, plen;
5302         uint8_t fnd;
5303         struct sctp_nets *net;
5304         int check_src;
5305 #ifdef INET
5306         struct sockaddr_in sin4, *sa4;
5307 #endif
5308 #ifdef INET6
5309         struct sockaddr_in6 sin6, *sa6;
5310 #endif
5311
5312 #ifdef INET
5313         memset(&sin4, 0, sizeof(sin4));
5314         sin4.sin_family = AF_INET;
5315         sin4.sin_len = sizeof(sin4);
5316 #endif
5317 #ifdef INET6
5318         memset(&sin6, 0, sizeof(sin6));
5319         sin6.sin6_family = AF_INET6;
5320         sin6.sin6_len = sizeof(sin6);
5321 #endif
5322         /* First what about the src address of the pkt ? */
5323         check_src = 0;
5324         switch (src->sa_family) {
5325 #ifdef INET
5326         case AF_INET:
5327                 if (asoc->scope.ipv4_addr_legal) {
5328                         check_src = 1;
5329                 }
5330                 break;
5331 #endif
5332 #ifdef INET6
5333         case AF_INET6:
5334                 if (asoc->scope.ipv6_addr_legal) {
5335                         check_src = 1;
5336                 }
5337                 break;
5338 #endif
5339         default:
5340                 /* TSNH */
5341                 break;
5342         }
5343         if (check_src) {
5344                 fnd = 0;
5345                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5346                         sa = (struct sockaddr *)&net->ro._l_addr;
5347                         if (sa->sa_family == src->sa_family) {
5348 #ifdef INET
5349                                 if (sa->sa_family == AF_INET) {
5350                                         struct sockaddr_in *src4;
5351
5352                                         sa4 = (struct sockaddr_in *)sa;
5353                                         src4 = (struct sockaddr_in *)src;
5354                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5355                                                 fnd = 1;
5356                                                 break;
5357                                         }
5358                                 }
5359 #endif
5360 #ifdef INET6
5361                                 if (sa->sa_family == AF_INET6) {
5362                                         struct sockaddr_in6 *src6;
5363
5364                                         sa6 = (struct sockaddr_in6 *)sa;
5365                                         src6 = (struct sockaddr_in6 *)src;
5366                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5367                                                 fnd = 1;
5368                                                 break;
5369                                         }
5370                                 }
5371 #endif
5372                         }
5373                 }
5374                 if (fnd == 0) {
5375                         /* New address added! no need to look further. */
5376                         return (1);
5377                 }
5378         }
5379         /* Ok so far lets munge through the rest of the packet */
5380         offset += sizeof(struct sctp_init_chunk);
5381         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5382         while (phdr) {
5383                 sa_touse = NULL;
5384                 ptype = ntohs(phdr->param_type);
5385                 plen = ntohs(phdr->param_length);
5386                 switch (ptype) {
5387 #ifdef INET
5388                 case SCTP_IPV4_ADDRESS:
5389                         {
5390                                 struct sctp_ipv4addr_param *p4, p4_buf;
5391
5392                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5393                                         return (1);
5394                                 }
5395                                 phdr = sctp_get_next_param(in_initpkt, offset,
5396                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5397                                 if (phdr == NULL) {
5398                                         return (1);
5399                                 }
5400                                 if (asoc->scope.ipv4_addr_legal) {
5401                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5402                                         sin4.sin_addr.s_addr = p4->addr;
5403                                         sa_touse = (struct sockaddr *)&sin4;
5404                                 }
5405                                 break;
5406                         }
5407 #endif
5408 #ifdef INET6
5409                 case SCTP_IPV6_ADDRESS:
5410                         {
5411                                 struct sctp_ipv6addr_param *p6, p6_buf;
5412
5413                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5414                                         return (1);
5415                                 }
5416                                 phdr = sctp_get_next_param(in_initpkt, offset,
5417                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5418                                 if (phdr == NULL) {
5419                                         return (1);
5420                                 }
5421                                 if (asoc->scope.ipv6_addr_legal) {
5422                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5423                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5424                                             sizeof(p6->addr));
5425                                         sa_touse = (struct sockaddr *)&sin6;
5426                                 }
5427                                 break;
5428                         }
5429 #endif
5430                 default:
5431                         sa_touse = NULL;
5432                         break;
5433                 }
5434                 if (sa_touse) {
5435                         /* ok, sa_touse points to one to check */
5436                         fnd = 0;
5437                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5438                                 sa = (struct sockaddr *)&net->ro._l_addr;
5439                                 if (sa->sa_family != sa_touse->sa_family) {
5440                                         continue;
5441                                 }
5442 #ifdef INET
5443                                 if (sa->sa_family == AF_INET) {
5444                                         sa4 = (struct sockaddr_in *)sa;
5445                                         if (sa4->sin_addr.s_addr ==
5446                                             sin4.sin_addr.s_addr) {
5447                                                 fnd = 1;
5448                                                 break;
5449                                         }
5450                                 }
5451 #endif
5452 #ifdef INET6
5453                                 if (sa->sa_family == AF_INET6) {
5454                                         sa6 = (struct sockaddr_in6 *)sa;
5455                                         if (SCTP6_ARE_ADDR_EQUAL(
5456                                             sa6, &sin6)) {
5457                                                 fnd = 1;
5458                                                 break;
5459                                         }
5460                                 }
5461 #endif
5462                         }
5463                         if (!fnd) {
5464                                 /* New addr added! no need to look further */
5465                                 return (1);
5466                         }
5467                 }
5468                 offset += SCTP_SIZE32(plen);
5469                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5470         }
5471         return (0);
5472 }
5473
5474 /*
5475  * Given a MBUF chain that was sent into us containing an INIT. Build a
5476  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5477  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5478  * message (i.e. the struct sctp_init_msg).
5479  */
5480 void
5481 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5482     struct sctp_nets *src_net, struct mbuf *init_pkt,
5483     int iphlen, int offset,
5484     struct sockaddr *src, struct sockaddr *dst,
5485     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5486     uint8_t mflowtype, uint32_t mflowid,
5487     uint32_t vrf_id, uint16_t port)
5488 {
5489         struct sctp_association *asoc;
5490         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5491         struct sctp_init_ack_chunk *initack;
5492         struct sctp_adaptation_layer_indication *ali;
5493         struct sctp_supported_chunk_types_param *pr_supported;
5494         struct sctp_paramhdr *ph;
5495         union sctp_sockstore *over_addr;
5496         struct sctp_scoping scp;
5497         struct timeval now;
5498 #ifdef INET
5499         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5500         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5501         struct sockaddr_in *sin;
5502 #endif
5503 #ifdef INET6
5504         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5505         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5506         struct sockaddr_in6 *sin6;
5507 #endif
5508         struct sockaddr *to;
5509         struct sctp_state_cookie stc;
5510         struct sctp_nets *net = NULL;
5511         uint8_t *signature = NULL;
5512         int cnt_inits_to = 0;
5513         uint16_t his_limit, i_want;
5514         int abort_flag;
5515         int nat_friendly = 0;
5516         int error;
5517         struct socket *so;
5518         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5519
5520         if (stcb) {
5521                 asoc = &stcb->asoc;
5522         } else {
5523                 asoc = NULL;
5524         }
5525         if ((asoc != NULL) &&
5526             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5527                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5528                         /*
5529                          * new addresses, out of here in non-cookie-wait
5530                          * states
5531                          *
5532                          * Send an ABORT, without the new address error
5533                          * cause. This looks no different than if no
5534                          * listener was present.
5535                          */
5536                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5537                             "Address added");
5538                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5539                             mflowtype, mflowid, inp->fibnum,
5540                             vrf_id, port);
5541                         return;
5542                 }
5543                 if (src_net != NULL && (src_net->port != port)) {
5544                         /*
5545                          * change of remote encapsulation port, out of here
5546                          * in non-cookie-wait states
5547                          *
5548                          * Send an ABORT, without an specific error cause.
5549                          * This looks no different than if no listener was
5550                          * present.
5551                          */
5552                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5553                             "Remote encapsulation port changed");
5554                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5555                             mflowtype, mflowid, inp->fibnum,
5556                             vrf_id, port);
5557                         return;
5558                 }
5559         }
5560         abort_flag = 0;
5561         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5562             (offset + sizeof(struct sctp_init_chunk)),
5563             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5564         if (abort_flag) {
5565 do_a_abort:
5566                 if (op_err == NULL) {
5567                         char msg[SCTP_DIAG_INFO_LEN];
5568
5569                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5570                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5571                             msg);
5572                 }
5573                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5574                     init_chk->init.initiate_tag, op_err,
5575                     mflowtype, mflowid, inp->fibnum,
5576                     vrf_id, port);
5577                 return;
5578         }
5579         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5580         if (m == NULL) {
5581                 /* No memory, INIT timer will re-attempt. */
5582                 if (op_err)
5583                         sctp_m_freem(op_err);
5584                 return;
5585         }
5586         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5587         padding_len = 0;
5588
5589         /*
5590          * We might not overwrite the identification[] completely and on
5591          * some platforms time_entered will contain some padding. Therefore
5592          * zero out the cookie to avoid putting uninitialized memory on the
5593          * wire.
5594          */
5595         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5596
5597         /* the time I built cookie */
5598         (void)SCTP_GETTIME_TIMEVAL(&now);
5599         stc.time_entered.tv_sec = now.tv_sec;
5600         stc.time_entered.tv_usec = now.tv_usec;
5601
5602         /* populate any tie tags */
5603         if (asoc != NULL) {
5604                 /* unlock before tag selections */
5605                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5606                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5607                 stc.cookie_life = asoc->cookie_life;
5608                 net = asoc->primary_destination;
5609         } else {
5610                 stc.tie_tag_my_vtag = 0;
5611                 stc.tie_tag_peer_vtag = 0;
5612                 /* life I will award this cookie */
5613                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5614         }
5615
5616         /* copy in the ports for later check */
5617         stc.myport = sh->dest_port;
5618         stc.peerport = sh->src_port;
5619
5620         /*
5621          * If we wanted to honor cookie life extensions, we would add to
5622          * stc.cookie_life. For now we should NOT honor any extension
5623          */
5624         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5625         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5626                 stc.ipv6_addr_legal = 1;
5627                 if (SCTP_IPV6_V6ONLY(inp)) {
5628                         stc.ipv4_addr_legal = 0;
5629                 } else {
5630                         stc.ipv4_addr_legal = 1;
5631                 }
5632         } else {
5633                 stc.ipv6_addr_legal = 0;
5634                 stc.ipv4_addr_legal = 1;
5635         }
5636         stc.ipv4_scope = 0;
5637         if (net == NULL) {
5638                 to = src;
5639                 switch (dst->sa_family) {
5640 #ifdef INET
5641                 case AF_INET:
5642                         {
5643                                 /* lookup address */
5644                                 stc.address[0] = src4->sin_addr.s_addr;
5645                                 stc.address[1] = 0;
5646                                 stc.address[2] = 0;
5647                                 stc.address[3] = 0;
5648                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5649                                 /* local from address */
5650                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5651                                 stc.laddress[1] = 0;
5652                                 stc.laddress[2] = 0;
5653                                 stc.laddress[3] = 0;
5654                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5655                                 /* scope_id is only for v6 */
5656                                 stc.scope_id = 0;
5657                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5658                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5659                                         stc.ipv4_scope = 1;
5660                                 }
5661                                 /* Must use the address in this case */
5662                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5663                                         stc.loopback_scope = 1;
5664                                         stc.ipv4_scope = 1;
5665                                         stc.site_scope = 1;
5666                                         stc.local_scope = 0;
5667                                 }
5668                                 break;
5669                         }
5670 #endif
5671 #ifdef INET6
5672                 case AF_INET6:
5673                         {
5674                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5675                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5676                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5677                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5678                                         stc.loopback_scope = 1;
5679                                         stc.local_scope = 0;
5680                                         stc.site_scope = 1;
5681                                         stc.ipv4_scope = 1;
5682                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5683                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5684                                         /*
5685                                          * If the new destination or source
5686                                          * is a LINK_LOCAL we must have
5687                                          * common both site and local scope.
5688                                          * Don't set local scope though
5689                                          * since we must depend on the
5690                                          * source to be added implicitly. We
5691                                          * cannot assure just because we
5692                                          * share one link that all links are
5693                                          * common.
5694                                          */
5695                                         stc.local_scope = 0;
5696                                         stc.site_scope = 1;
5697                                         stc.ipv4_scope = 1;
5698                                         /*
5699                                          * we start counting for the private
5700                                          * address stuff at 1. since the
5701                                          * link local we source from won't
5702                                          * show up in our scoped count.
5703                                          */
5704                                         cnt_inits_to = 1;
5705                                         /*
5706                                          * pull out the scope_id from
5707                                          * incoming pkt
5708                                          */
5709                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5710                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5711                                         /*
5712                                          * If the new destination or source
5713                                          * is SITE_LOCAL then we must have
5714                                          * site scope in common.
5715                                          */
5716                                         stc.site_scope = 1;
5717                                 }
5718                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5719                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5720                                 break;
5721                         }
5722 #endif
5723                 default:
5724                         /* TSNH */
5725                         goto do_a_abort;
5726                         break;
5727                 }
5728         } else {
5729                 /* set the scope per the existing tcb */
5730
5731 #ifdef INET6
5732                 struct sctp_nets *lnet;
5733 #endif
5734
5735                 stc.loopback_scope = asoc->scope.loopback_scope;
5736                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5737                 stc.site_scope = asoc->scope.site_scope;
5738                 stc.local_scope = asoc->scope.local_scope;
5739 #ifdef INET6
5740                 /* Why do we not consider IPv4 LL addresses? */
5741                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5742                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5743                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5744                                         /*
5745                                          * if we have a LL address, start
5746                                          * counting at 1.
5747                                          */
5748                                         cnt_inits_to = 1;
5749                                 }
5750                         }
5751                 }
5752 #endif
5753                 /* use the net pointer */
5754                 to = (struct sockaddr *)&net->ro._l_addr;
5755                 switch (to->sa_family) {
5756 #ifdef INET
5757                 case AF_INET:
5758                         sin = (struct sockaddr_in *)to;
5759                         stc.address[0] = sin->sin_addr.s_addr;
5760                         stc.address[1] = 0;
5761                         stc.address[2] = 0;
5762                         stc.address[3] = 0;
5763                         stc.addr_type = SCTP_IPV4_ADDRESS;
5764                         if (net->src_addr_selected == 0) {
5765                                 /*
5766                                  * strange case here, the INIT should have
5767                                  * did the selection.
5768                                  */
5769                                 net->ro._s_addr = sctp_source_address_selection(inp,
5770                                     stcb, (sctp_route_t *)&net->ro,
5771                                     net, 0, vrf_id);
5772                                 if (net->ro._s_addr == NULL)
5773                                         return;
5774
5775                                 net->src_addr_selected = 1;
5776
5777                         }
5778                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5779                         stc.laddress[1] = 0;
5780                         stc.laddress[2] = 0;
5781                         stc.laddress[3] = 0;
5782                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5783                         /* scope_id is only for v6 */
5784                         stc.scope_id = 0;
5785                         break;
5786 #endif
5787 #ifdef INET6
5788                 case AF_INET6:
5789                         sin6 = (struct sockaddr_in6 *)to;
5790                         memcpy(&stc.address, &sin6->sin6_addr,
5791                             sizeof(struct in6_addr));
5792                         stc.addr_type = SCTP_IPV6_ADDRESS;
5793                         stc.scope_id = sin6->sin6_scope_id;
5794                         if (net->src_addr_selected == 0) {
5795                                 /*
5796                                  * strange case here, the INIT should have
5797                                  * done the selection.
5798                                  */
5799                                 net->ro._s_addr = sctp_source_address_selection(inp,
5800                                     stcb, (sctp_route_t *)&net->ro,
5801                                     net, 0, vrf_id);
5802                                 if (net->ro._s_addr == NULL)
5803                                         return;
5804
5805                                 net->src_addr_selected = 1;
5806                         }
5807                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5808                             sizeof(struct in6_addr));
5809                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5810                         break;
5811 #endif
5812                 }
5813         }
5814         /* Now lets put the SCTP header in place */
5815         initack = mtod(m, struct sctp_init_ack_chunk *);
5816         /* Save it off for quick ref */
5817         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5818         /* who are we */
5819         memcpy(stc.identification, SCTP_VERSION_STRING,
5820             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5821         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5822         /* now the chunk header */
5823         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5824         initack->ch.chunk_flags = 0;
5825         /* fill in later from mbuf we build */
5826         initack->ch.chunk_length = 0;
5827         /* place in my tag */
5828         if ((asoc != NULL) &&
5829             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5830             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5831             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5832                 /* re-use the v-tags and init-seq here */
5833                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5834                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5835         } else {
5836                 uint32_t vtag, itsn;
5837
5838                 if (asoc) {
5839                         atomic_add_int(&asoc->refcnt, 1);
5840                         SCTP_TCB_UNLOCK(stcb);
5841         new_tag:
5842                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5843                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5844                                 /*
5845                                  * Got a duplicate vtag on some guy behind a
5846                                  * nat make sure we don't use it.
5847                                  */
5848                                 goto new_tag;
5849                         }
5850                         initack->init.initiate_tag = htonl(vtag);
5851                         /* get a TSN to use too */
5852                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5853                         initack->init.initial_tsn = htonl(itsn);
5854                         SCTP_TCB_LOCK(stcb);
5855                         atomic_add_int(&asoc->refcnt, -1);
5856                 } else {
5857                         SCTP_INP_INCR_REF(inp);
5858                         SCTP_INP_RUNLOCK(inp);
5859                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5860                         initack->init.initiate_tag = htonl(vtag);
5861                         /* get a TSN to use too */
5862                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5863                         SCTP_INP_RLOCK(inp);
5864                         SCTP_INP_DECR_REF(inp);
5865                 }
5866         }
5867         /* save away my tag to */
5868         stc.my_vtag = initack->init.initiate_tag;
5869
5870         /* set up some of the credits. */
5871         so = inp->sctp_socket;
5872         if (so == NULL) {
5873                 /* memory problem */
5874                 sctp_m_freem(m);
5875                 return;
5876         } else {
5877                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5878         }
5879         /* set what I want */
5880         his_limit = ntohs(init_chk->init.num_inbound_streams);
5881         /* choose what I want */
5882         if (asoc != NULL) {
5883                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5884                         i_want = asoc->streamoutcnt;
5885                 } else {
5886                         i_want = asoc->pre_open_streams;
5887                 }
5888         } else {
5889                 i_want = inp->sctp_ep.pre_open_stream_count;
5890         }
5891         if (his_limit < i_want) {
5892                 /* I Want more :< */
5893                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5894         } else {
5895                 /* I can have what I want :> */
5896                 initack->init.num_outbound_streams = htons(i_want);
5897         }
5898         /* tell him his limit. */
5899         initack->init.num_inbound_streams =
5900             htons(inp->sctp_ep.max_open_streams_intome);
5901
5902         /* adaptation layer indication parameter */
5903         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5904                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5905                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5906                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5907                 ali->ph.param_length = htons(parameter_len);
5908                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5909                 chunk_len += parameter_len;
5910         }
5911
5912         /* ECN parameter */
5913         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5914             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5915                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5916                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5917                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5918                 ph->param_length = htons(parameter_len);
5919                 chunk_len += parameter_len;
5920         }
5921
5922         /* PR-SCTP supported parameter */
5923         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5924             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5925                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5926                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5927                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5928                 ph->param_length = htons(parameter_len);
5929                 chunk_len += parameter_len;
5930         }
5931
5932         /* Add NAT friendly parameter */
5933         if (nat_friendly) {
5934                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5935                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5936                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5937                 ph->param_length = htons(parameter_len);
5938                 chunk_len += parameter_len;
5939         }
5940
5941         /* And now tell the peer which extensions we support */
5942         num_ext = 0;
5943         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5944         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5945             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5946                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5947                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5948                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5949                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5950                 }
5951         }
5952         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5953             ((asoc == NULL) && (inp->auth_supported == 1))) {
5954                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5955         }
5956         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5957             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5958                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5959                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5960         }
5961         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5962             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5963                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5964         }
5965         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5966             ((asoc == NULL) && (inp->idata_supported == 1))) {
5967                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5968         }
5969         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5970             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5971                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5972         }
5973         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5974             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5975                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5976         }
5977         if (num_ext > 0) {
5978                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5979                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5980                 pr_supported->ph.param_length = htons(parameter_len);
5981                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5982                 chunk_len += parameter_len;
5983         }
5984
5985         /* add authentication parameters */
5986         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5987             ((asoc == NULL) && (inp->auth_supported == 1))) {
5988                 struct sctp_auth_random *randp;
5989                 struct sctp_auth_hmac_algo *hmacs;
5990                 struct sctp_auth_chunk_list *chunks;
5991
5992                 if (padding_len > 0) {
5993                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5994                         chunk_len += padding_len;
5995                         padding_len = 0;
5996                 }
5997                 /* generate and add RANDOM parameter */
5998                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5999                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6000                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6001                 randp->ph.param_type = htons(SCTP_RANDOM);
6002                 randp->ph.param_length = htons(parameter_len);
6003                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6004                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6005                 chunk_len += parameter_len;
6006
6007                 if (padding_len > 0) {
6008                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009                         chunk_len += padding_len;
6010                         padding_len = 0;
6011                 }
6012                 /* add HMAC_ALGO parameter */
6013                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6014                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6015                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6016                     (uint8_t *)hmacs->hmac_ids);
6017                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6018                 hmacs->ph.param_length = htons(parameter_len);
6019                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020                 chunk_len += parameter_len;
6021
6022                 if (padding_len > 0) {
6023                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6024                         chunk_len += padding_len;
6025                         padding_len = 0;
6026                 }
6027                 /* add CHUNKS parameter */
6028                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6029                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6030                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6031                     chunks->chunk_types);
6032                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6033                 chunks->ph.param_length = htons(parameter_len);
6034                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6035                 chunk_len += parameter_len;
6036         }
6037         SCTP_BUF_LEN(m) = chunk_len;
6038         m_last = m;
6039         /* now the addresses */
6040         /*
6041          * To optimize this we could put the scoping stuff into a structure
6042          * and remove the individual uint8's from the stc structure. Then we
6043          * could just sifa in the address within the stc.. but for now this
6044          * is a quick hack to get the address stuff teased apart.
6045          */
6046         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6047         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6048         scp.loopback_scope = stc.loopback_scope;
6049         scp.ipv4_local_scope = stc.ipv4_scope;
6050         scp.local_scope = stc.local_scope;
6051         scp.site_scope = stc.site_scope;
6052         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6053             cnt_inits_to,
6054             &padding_len, &chunk_len);
6055         /* padding_len can only be positive, if no addresses have been added */
6056         if (padding_len > 0) {
6057                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6058                 chunk_len += padding_len;
6059                 SCTP_BUF_LEN(m) += padding_len;
6060                 padding_len = 0;
6061         }
6062
6063         /* tack on the operational error if present */
6064         if (op_err) {
6065                 parameter_len = 0;
6066                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6067                         parameter_len += SCTP_BUF_LEN(m_tmp);
6068                 }
6069                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6070                 SCTP_BUF_NEXT(m_last) = op_err;
6071                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6072                         m_last = SCTP_BUF_NEXT(m_last);
6073                 }
6074                 chunk_len += parameter_len;
6075         }
6076         if (padding_len > 0) {
6077                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6078                 if (m_last == NULL) {
6079                         /* Houston we have a problem, no space */
6080                         sctp_m_freem(m);
6081                         return;
6082                 }
6083                 chunk_len += padding_len;
6084                 padding_len = 0;
6085         }
6086         /* Now we must build a cookie */
6087         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6088         if (m_cookie == NULL) {
6089                 /* memory problem */
6090                 sctp_m_freem(m);
6091                 return;
6092         }
6093         /* Now append the cookie to the end and update the space/size */
6094         SCTP_BUF_NEXT(m_last) = m_cookie;
6095         parameter_len = 0;
6096         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6097                 parameter_len += SCTP_BUF_LEN(m_tmp);
6098                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6099                         m_last = m_tmp;
6100                 }
6101         }
6102         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6103         chunk_len += parameter_len;
6104
6105         /*
6106          * Place in the size, but we don't include the last pad (if any) in
6107          * the INIT-ACK.
6108          */
6109         initack->ch.chunk_length = htons(chunk_len);
6110
6111         /*
6112          * Time to sign the cookie, we don't sign over the cookie signature
6113          * though thus we set trailer.
6114          */
6115         (void)sctp_hmac_m(SCTP_HMAC,
6116             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6117             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6118             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6119         /*
6120          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6121          * here since the timer will drive a retranmission.
6122          */
6123         if (padding_len > 0) {
6124                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6125                         sctp_m_freem(m);
6126                         return;
6127                 }
6128         }
6129         if (stc.loopback_scope) {
6130                 over_addr = (union sctp_sockstore *)dst;
6131         } else {
6132                 over_addr = NULL;
6133         }
6134
6135         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6136             0, 0,
6137             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6138             port, over_addr,
6139             mflowtype, mflowid,
6140             SCTP_SO_NOT_LOCKED))) {
6141                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6142                 if (error == ENOBUFS) {
6143                         if (asoc != NULL) {
6144                                 asoc->ifp_had_enobuf = 1;
6145                         }
6146                         SCTP_STAT_INCR(sctps_lowlevelerr);
6147                 }
6148         } else {
6149                 if (asoc != NULL) {
6150                         asoc->ifp_had_enobuf = 0;
6151                 }
6152         }
6153         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6154 }
6155
6156
6157 static void
6158 sctp_prune_prsctp(struct sctp_tcb *stcb,
6159     struct sctp_association *asoc,
6160     struct sctp_sndrcvinfo *srcv,
6161     int dataout)
6162 {
6163         int freed_spc = 0;
6164         struct sctp_tmit_chunk *chk, *nchk;
6165
6166         SCTP_TCB_LOCK_ASSERT(stcb);
6167         if ((asoc->prsctp_supported) &&
6168             (asoc->sent_queue_cnt_removeable > 0)) {
6169                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6170                         /*
6171                          * Look for chunks marked with the PR_SCTP flag AND
6172                          * the buffer space flag. If the one being sent is
6173                          * equal or greater priority then purge the old one
6174                          * and free some space.
6175                          */
6176                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6177                                 /*
6178                                  * This one is PR-SCTP AND buffer space
6179                                  * limited type
6180                                  */
6181                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6182                                         /*
6183                                          * Lower numbers equates to higher
6184                                          * priority so if the one we are
6185                                          * looking at has a larger or equal
6186                                          * priority we want to drop the data
6187                                          * and NOT retransmit it.
6188                                          */
6189                                         if (chk->data) {
6190                                                 /*
6191                                                  * We release the book_size
6192                                                  * if the mbuf is here
6193                                                  */
6194                                                 int ret_spc;
6195                                                 uint8_t sent;
6196
6197                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6198                                                         sent = 1;
6199                                                 else
6200                                                         sent = 0;
6201                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6202                                                     sent,
6203                                                     SCTP_SO_LOCKED);
6204                                                 freed_spc += ret_spc;
6205                                                 if (freed_spc >= dataout) {
6206                                                         return;
6207                                                 }
6208                                         }       /* if chunk was present */
6209                                 }       /* if of sufficient priority */
6210                         }       /* if chunk has enabled */
6211                 }               /* tailqforeach */
6212
6213                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6214                         /* Here we must move to the sent queue and mark */
6215                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6216                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6217                                         if (chk->data) {
6218                                                 /*
6219                                                  * We release the book_size
6220                                                  * if the mbuf is here
6221                                                  */
6222                                                 int ret_spc;
6223
6224                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6225                                                     0, SCTP_SO_LOCKED);
6226
6227                                                 freed_spc += ret_spc;
6228                                                 if (freed_spc >= dataout) {
6229                                                         return;
6230                                                 }
6231                                         }       /* end if chk->data */
6232                                 }       /* end if right class */
6233                         }       /* end if chk pr-sctp */
6234                 }               /* tailqforeachsafe (chk) */
6235         }                       /* if enabled in asoc */
6236 }
6237
6238 int
6239 sctp_get_frag_point(struct sctp_tcb *stcb,
6240     struct sctp_association *asoc)
6241 {
6242         int siz, ovh;
6243
6244         /*
6245          * For endpoints that have both v6 and v4 addresses we must reserve
6246          * room for the ipv6 header, for those that are only dealing with V4
6247          * we use a larger frag point.
6248          */
6249         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6250                 ovh = SCTP_MIN_OVERHEAD;
6251         } else {
6252                 ovh = SCTP_MIN_V4_OVERHEAD;
6253         }
6254         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6255         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6256                 siz = asoc->smallest_mtu - ovh;
6257         else
6258                 siz = (stcb->asoc.sctp_frag_point - ovh);
6259         /*
6260          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6261          */
6262         /* A data chunk MUST fit in a cluster */
6263         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6264         /* } */
6265
6266         /* adjust for an AUTH chunk if DATA requires auth */
6267         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6268                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6269
6270         if (siz % 4) {
6271                 /* make it an even word boundary please */
6272                 siz -= (siz % 4);
6273         }
6274         return (siz);
6275 }
6276
6277 static void
6278 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6279 {
6280         /*
6281          * We assume that the user wants PR_SCTP_TTL if the user provides a
6282          * positive lifetime but does not specify any PR_SCTP policy.
6283          */
6284         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6285                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6286         } else if (sp->timetolive > 0) {
6287                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6288                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6289         } else {
6290                 return;
6291         }
6292         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6293         case CHUNK_FLAGS_PR_SCTP_BUF:
6294                 /*
6295                  * Time to live is a priority stored in tv_sec when doing
6296                  * the buffer drop thing.
6297                  */
6298                 sp->ts.tv_sec = sp->timetolive;
6299                 sp->ts.tv_usec = 0;
6300                 break;
6301         case CHUNK_FLAGS_PR_SCTP_TTL:
6302                 {
6303                         struct timeval tv;
6304
6305                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6306                         tv.tv_sec = sp->timetolive / 1000;
6307                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6308                         /*
6309                          * TODO sctp_constants.h needs alternative time
6310                          * macros when _KERNEL is undefined.
6311                          */
6312                         timevaladd(&sp->ts, &tv);
6313                 }
6314                 break;
6315         case CHUNK_FLAGS_PR_SCTP_RTX:
6316                 /*
6317                  * Time to live is a the number or retransmissions stored in
6318                  * tv_sec.
6319                  */
6320                 sp->ts.tv_sec = sp->timetolive;
6321                 sp->ts.tv_usec = 0;
6322                 break;
6323         default:
6324                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6325                     "Unknown PR_SCTP policy %u.\n",
6326                     PR_SCTP_POLICY(sp->sinfo_flags));
6327                 break;
6328         }
6329 }
6330
6331 static int
6332 sctp_msg_append(struct sctp_tcb *stcb,
6333     struct sctp_nets *net,
6334     struct mbuf *m,
6335     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6336 {
6337         int error = 0;
6338         struct mbuf *at;
6339         struct sctp_stream_queue_pending *sp = NULL;
6340         struct sctp_stream_out *strm;
6341
6342         /*
6343          * Given an mbuf chain, put it into the association send queue and
6344          * place it on the wheel
6345          */
6346         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6347                 /* Invalid stream number */
6348                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6349                 error = EINVAL;
6350                 goto out_now;
6351         }
6352         if ((stcb->asoc.stream_locked) &&
6353             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6354                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6355                 error = EINVAL;
6356                 goto out_now;
6357         }
6358         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6359         /* Now can we send this? */
6360         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6361             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6362             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6363             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6364                 /* got data while shutting down */
6365                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6366                 error = ECONNRESET;
6367                 goto out_now;
6368         }
6369         sctp_alloc_a_strmoq(stcb, sp);
6370         if (sp == NULL) {
6371                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6372                 error = ENOMEM;
6373                 goto out_now;
6374         }
6375         sp->sinfo_flags = srcv->sinfo_flags;
6376         sp->timetolive = srcv->sinfo_timetolive;
6377         sp->ppid = srcv->sinfo_ppid;
6378         sp->context = srcv->sinfo_context;
6379         sp->fsn = 0;
6380         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6381                 sp->net = net;
6382                 atomic_add_int(&sp->net->ref_count, 1);
6383         } else {
6384                 sp->net = NULL;
6385         }
6386         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6387         sp->sid = srcv->sinfo_stream;
6388         sp->msg_is_complete = 1;
6389         sp->sender_all_done = 1;
6390         sp->some_taken = 0;
6391         sp->data = m;
6392         sp->tail_mbuf = NULL;
6393         sctp_set_prsctp_policy(sp);
6394         /*
6395          * We could in theory (for sendall) sifa the length in, but we would
6396          * still have to hunt through the chain since we need to setup the
6397          * tail_mbuf
6398          */
6399         sp->length = 0;
6400         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6401                 if (SCTP_BUF_NEXT(at) == NULL)
6402                         sp->tail_mbuf = at;
6403                 sp->length += SCTP_BUF_LEN(at);
6404         }
6405         if (srcv->sinfo_keynumber_valid) {
6406                 sp->auth_keyid = srcv->sinfo_keynumber;
6407         } else {
6408                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6409         }
6410         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6411                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6412                 sp->holds_key_ref = 1;
6413         }
6414         if (hold_stcb_lock == 0) {
6415                 SCTP_TCB_SEND_LOCK(stcb);
6416         }
6417         sctp_snd_sb_alloc(stcb, sp->length);
6418         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6419         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6420         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6421         m = NULL;
6422         if (hold_stcb_lock == 0) {
6423                 SCTP_TCB_SEND_UNLOCK(stcb);
6424         }
6425 out_now:
6426         if (m) {
6427                 sctp_m_freem(m);
6428         }
6429         return (error);
6430 }
6431
6432
6433 static struct mbuf *
6434 sctp_copy_mbufchain(struct mbuf *clonechain,
6435     struct mbuf *outchain,
6436     struct mbuf **endofchain,
6437     int can_take_mbuf,
6438     int sizeofcpy,
6439     uint8_t copy_by_ref)
6440 {
6441         struct mbuf *m;
6442         struct mbuf *appendchain;
6443         caddr_t cp;
6444         int len;
6445
6446         if (endofchain == NULL) {
6447                 /* error */
6448 error_out:
6449                 if (outchain)
6450                         sctp_m_freem(outchain);
6451                 return (NULL);
6452         }
6453         if (can_take_mbuf) {
6454                 appendchain = clonechain;
6455         } else {
6456                 if (!copy_by_ref &&
6457                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6458                     ) {
6459                         /* Its not in a cluster */
6460                         if (*endofchain == NULL) {
6461                                 /* lets get a mbuf cluster */
6462                                 if (outchain == NULL) {
6463                                         /* This is the general case */
6464                         new_mbuf:
6465                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6466                                         if (outchain == NULL) {
6467                                                 goto error_out;
6468                                         }
6469                                         SCTP_BUF_LEN(outchain) = 0;
6470                                         *endofchain = outchain;
6471                                         /* get the prepend space */
6472                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6473                                 } else {
6474                                         /*
6475                                          * We really should not get a NULL
6476                                          * in endofchain
6477                                          */
6478                                         /* find end */
6479                                         m = outchain;
6480                                         while (m) {
6481                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6482                                                         *endofchain = m;
6483                                                         break;
6484                                                 }
6485                                                 m = SCTP_BUF_NEXT(m);
6486                                         }
6487                                         /* sanity */
6488                                         if (*endofchain == NULL) {
6489                                                 /*
6490                                                  * huh, TSNH XXX maybe we
6491                                                  * should panic
6492                                                  */
6493                                                 sctp_m_freem(outchain);
6494                                                 goto new_mbuf;
6495                                         }
6496                                 }
6497                                 /* get the new end of length */
6498                                 len = (int)M_TRAILINGSPACE(*endofchain);
6499                         } else {
6500                                 /* how much is left at the end? */
6501                                 len = (int)M_TRAILINGSPACE(*endofchain);
6502                         }
6503                         /* Find the end of the data, for appending */
6504                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6505
6506                         /* Now lets copy it out */
6507                         if (len >= sizeofcpy) {
6508                                 /* It all fits, copy it in */
6509                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6510                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6511                         } else {
6512                                 /* fill up the end of the chain */
6513                                 if (len > 0) {
6514                                         m_copydata(clonechain, 0, len, cp);
6515                                         SCTP_BUF_LEN((*endofchain)) += len;
6516                                         /* now we need another one */
6517                                         sizeofcpy -= len;
6518                                 }
6519                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6520                                 if (m == NULL) {
6521                                         /* We failed */
6522                                         goto error_out;
6523                                 }
6524                                 SCTP_BUF_NEXT((*endofchain)) = m;
6525                                 *endofchain = m;
6526                                 cp = mtod((*endofchain), caddr_t);
6527                                 m_copydata(clonechain, len, sizeofcpy, cp);
6528                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6529                         }
6530                         return (outchain);
6531                 } else {
6532                         /* copy the old fashion way */
6533                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6534 #ifdef SCTP_MBUF_LOGGING
6535                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6536                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6537                         }
6538 #endif
6539                 }
6540         }
6541         if (appendchain == NULL) {
6542                 /* error */
6543                 if (outchain)
6544                         sctp_m_freem(outchain);
6545                 return (NULL);
6546         }
6547         if (outchain) {
6548                 /* tack on to the end */
6549                 if (*endofchain != NULL) {
6550                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6551                 } else {
6552                         m = outchain;
6553                         while (m) {
6554                                 if (SCTP_BUF_NEXT(m) == NULL) {
6555                                         SCTP_BUF_NEXT(m) = appendchain;
6556                                         break;
6557                                 }
6558                                 m = SCTP_BUF_NEXT(m);
6559                         }
6560                 }
6561                 /*
6562                  * save off the end and update the end-chain position
6563                  */
6564                 m = appendchain;
6565                 while (m) {
6566                         if (SCTP_BUF_NEXT(m) == NULL) {
6567                                 *endofchain = m;
6568                                 break;
6569                         }
6570                         m = SCTP_BUF_NEXT(m);
6571                 }
6572                 return (outchain);
6573         } else {
6574                 /* save off the end and update the end-chain position */
6575                 m = appendchain;
6576                 while (m) {
6577                         if (SCTP_BUF_NEXT(m) == NULL) {
6578                                 *endofchain = m;
6579                                 break;
6580                         }
6581                         m = SCTP_BUF_NEXT(m);
6582                 }
6583                 return (appendchain);
6584         }
6585 }
6586
6587 static int
6588 sctp_med_chunk_output(struct sctp_inpcb *inp,
6589     struct sctp_tcb *stcb,
6590     struct sctp_association *asoc,
6591     int *num_out,
6592     int *reason_code,
6593     int control_only, int from_where,
6594     struct timeval *now, int *now_filled, int frag_point, int so_locked
6595 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6596     SCTP_UNUSED
6597 #endif
6598 );
6599
6600 static void
6601 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6602     uint32_t val SCTP_UNUSED)
6603 {
6604         struct sctp_copy_all *ca;
6605         struct mbuf *m;
6606         int ret = 0;
6607         int added_control = 0;
6608         int un_sent, do_chunk_output = 1;
6609         struct sctp_association *asoc;
6610         struct sctp_nets *net;
6611
6612         ca = (struct sctp_copy_all *)ptr;
6613         if (ca->m == NULL) {
6614                 return;
6615         }
6616         if (ca->inp != inp) {
6617                 /* TSNH */
6618                 return;
6619         }
6620         if (ca->sndlen > 0) {
6621                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6622                 if (m == NULL) {
6623                         /* can't copy so we are done */
6624                         ca->cnt_failed++;
6625                         return;
6626                 }
6627 #ifdef SCTP_MBUF_LOGGING
6628                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6629                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6630                 }
6631 #endif
6632         } else {
6633                 m = NULL;
6634         }
6635         SCTP_TCB_LOCK_ASSERT(stcb);
6636         if (stcb->asoc.alternate) {
6637                 net = stcb->asoc.alternate;
6638         } else {
6639                 net = stcb->asoc.primary_destination;
6640         }
6641         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6642                 /* Abort this assoc with m as the user defined reason */
6643                 if (m != NULL) {
6644                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6645                 } else {
6646                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6647                             0, M_NOWAIT, 1, MT_DATA);
6648                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6649                 }
6650                 if (m != NULL) {
6651                         struct sctp_paramhdr *ph;
6652
6653                         ph = mtod(m, struct sctp_paramhdr *);
6654                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6655                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6656                 }
6657                 /*
6658                  * We add one here to keep the assoc from dis-appearing on
6659                  * us.
6660                  */
6661                 atomic_add_int(&stcb->asoc.refcnt, 1);
6662                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6663                 /*
6664                  * sctp_abort_an_association calls sctp_free_asoc() free
6665                  * association will NOT free it since we incremented the
6666                  * refcnt .. we do this to prevent it being freed and things
6667                  * getting tricky since we could end up (from free_asoc)
6668                  * calling inpcb_free which would get a recursive lock call
6669                  * to the iterator lock.. But as a consequence of that the
6670                  * stcb will return to us un-locked.. since free_asoc
6671                  * returns with either no TCB or the TCB unlocked, we must
6672                  * relock.. to unlock in the iterator timer :-0
6673                  */
6674                 SCTP_TCB_LOCK(stcb);
6675                 atomic_add_int(&stcb->asoc.refcnt, -1);
6676                 goto no_chunk_output;
6677         } else {
6678                 if (m) {
6679                         ret = sctp_msg_append(stcb, net, m,
6680                             &ca->sndrcv, 1);
6681                 }
6682                 asoc = &stcb->asoc;
6683                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6684                         /* shutdown this assoc */
6685                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6686                             TAILQ_EMPTY(&asoc->sent_queue) &&
6687                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6688                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6689                                         goto abort_anyway;
6690                                 }
6691                                 /*
6692                                  * there is nothing queued to send, so I'm
6693                                  * done...
6694                                  */
6695                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6696                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6697                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6698                                         /*
6699                                          * only send SHUTDOWN the first time
6700                                          * through
6701                                          */
6702                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6703                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6704                                         }
6705                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6706                                         SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6707                                         sctp_stop_timers_for_shutdown(stcb);
6708                                         sctp_send_shutdown(stcb, net);
6709                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6710                                             net);
6711                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6712                                             asoc->primary_destination);
6713                                         added_control = 1;
6714                                         do_chunk_output = 0;
6715                                 }
6716                         } else {
6717                                 /*
6718                                  * we still got (or just got) data to send,
6719                                  * so set SHUTDOWN_PENDING
6720                                  */
6721                                 /*
6722                                  * XXX sockets draft says that SCTP_EOF
6723                                  * should be sent with no data.  currently,
6724                                  * we will allow user data to be sent first
6725                                  * and move to SHUTDOWN-PENDING
6726                                  */
6727                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6728                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6729                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6730                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6731                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6732                                         }
6733                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6734                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6735                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6736                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6737                                                 struct mbuf *op_err;
6738                                                 char msg[SCTP_DIAG_INFO_LEN];
6739
6740                                 abort_anyway:
6741                                                 snprintf(msg, sizeof(msg),
6742                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6743                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6744                                                     msg);
6745                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6746                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6747                                                     op_err, SCTP_SO_NOT_LOCKED);
6748                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6749                                                 goto no_chunk_output;
6750                                         }
6751                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6752                                             asoc->primary_destination);
6753                                 }
6754                         }
6755
6756                 }
6757         }
6758         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6759             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6760
6761         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6762             (stcb->asoc.total_flight > 0) &&
6763             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6764                 do_chunk_output = 0;
6765         }
6766         if (do_chunk_output)
6767                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6768         else if (added_control) {
6769                 int num_out, reason, now_filled = 0;
6770                 struct timeval now;
6771                 int frag_point;
6772
6773                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6774                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6775                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6776         }
6777 no_chunk_output:
6778         if (ret) {
6779                 ca->cnt_failed++;
6780         } else {
6781                 ca->cnt_sent++;
6782         }
6783 }
6784
6785 static void
6786 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6787 {
6788         struct sctp_copy_all *ca;
6789
6790         ca = (struct sctp_copy_all *)ptr;
6791         /*
6792          * Do a notify here? Kacheong suggests that the notify be done at
6793          * the send time.. so you would push up a notification if any send
6794          * failed. Don't know if this is feasible since the only failures we
6795          * have is "memory" related and if you cannot get an mbuf to send
6796          * the data you surely can't get an mbuf to send up to notify the
6797          * user you can't send the data :->
6798          */
6799
6800         /* now free everything */
6801         if (ca->inp) {
6802                 /* Lets clear the flag to allow others to run. */
6803                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6804         }
6805         sctp_m_freem(ca->m);
6806         SCTP_FREE(ca, SCTP_M_COPYAL);
6807 }
6808
6809 static struct mbuf *
6810 sctp_copy_out_all(struct uio *uio, ssize_t len)
6811 {
6812         struct mbuf *ret, *at;
6813         ssize_t left, willcpy, cancpy, error;
6814
6815         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6816         if (ret == NULL) {
6817                 /* TSNH */
6818                 return (NULL);
6819         }
6820         left = len;
6821         SCTP_BUF_LEN(ret) = 0;
6822         /* save space for the data chunk header */
6823         cancpy = (int)M_TRAILINGSPACE(ret);
6824         willcpy = min(cancpy, left);
6825         at = ret;
6826         while (left > 0) {
6827                 /* Align data to the end */
6828                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6829                 if (error) {
6830         err_out_now:
6831                         sctp_m_freem(at);
6832                         return (NULL);
6833                 }
6834                 SCTP_BUF_LEN(at) = (int)willcpy;
6835                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6836                 left -= willcpy;
6837                 if (left > 0) {
6838                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6839                         if (SCTP_BUF_NEXT(at) == NULL) {
6840                                 goto err_out_now;
6841                         }
6842                         at = SCTP_BUF_NEXT(at);
6843                         SCTP_BUF_LEN(at) = 0;
6844                         cancpy = (int)M_TRAILINGSPACE(at);
6845                         willcpy = min(cancpy, left);
6846                 }
6847         }
6848         return (ret);
6849 }
6850
6851 static int
6852 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6853     struct sctp_sndrcvinfo *srcv)
6854 {
6855         int ret;
6856         struct sctp_copy_all *ca;
6857
6858         if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6859                 /* There is another. */
6860                 return (EBUSY);
6861         }
6862         if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6863                 /* You must be less than the max! */
6864                 return (EMSGSIZE);
6865         }
6866         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6867             SCTP_M_COPYAL);
6868         if (ca == NULL) {
6869                 sctp_m_freem(m);
6870                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6871                 return (ENOMEM);
6872         }
6873         memset(ca, 0, sizeof(struct sctp_copy_all));
6874
6875         ca->inp = inp;
6876         if (srcv) {
6877                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6878         }
6879         /*
6880          * take off the sendall flag, it would be bad if we failed to do
6881          * this :-0
6882          */
6883         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6884         /* get length and mbuf chain */
6885         if (uio) {
6886                 ca->sndlen = uio->uio_resid;
6887                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6888                 if (ca->m == NULL) {
6889                         SCTP_FREE(ca, SCTP_M_COPYAL);
6890                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6891                         return (ENOMEM);
6892                 }
6893         } else {
6894                 /* Gather the length of the send */
6895                 struct mbuf *mat;
6896
6897                 ca->sndlen = 0;
6898                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6899                         ca->sndlen += SCTP_BUF_LEN(mat);
6900                 }
6901         }
6902         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6903         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6904             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6905             SCTP_ASOC_ANY_STATE,
6906             (void *)ca, 0,
6907             sctp_sendall_completes, inp, 1);
6908         if (ret) {
6909                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6910                 SCTP_FREE(ca, SCTP_M_COPYAL);
6911                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6912                 return (EFAULT);
6913         }
6914         return (0);
6915 }
6916
6917
6918 void
6919 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6920 {
6921         struct sctp_tmit_chunk *chk, *nchk;
6922
6923         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6924                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6925                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6926                         asoc->ctrl_queue_cnt--;
6927                         if (chk->data) {
6928                                 sctp_m_freem(chk->data);
6929                                 chk->data = NULL;
6930                         }
6931                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6932                 }
6933         }
6934 }
6935
6936 void
6937 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6938 {
6939         struct sctp_association *asoc;
6940         struct sctp_tmit_chunk *chk, *nchk;
6941         struct sctp_asconf_chunk *acp;
6942
6943         asoc = &stcb->asoc;
6944         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6945                 /* find SCTP_ASCONF chunk in queue */
6946                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6947                         if (chk->data) {
6948                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6949                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6950                                         /* Not Acked yet */
6951                                         break;
6952                                 }
6953                         }
6954                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6955                         asoc->ctrl_queue_cnt--;
6956                         if (chk->data) {
6957                                 sctp_m_freem(chk->data);
6958                                 chk->data = NULL;
6959                         }
6960                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6961                 }
6962         }
6963 }
6964
6965
6966 static void
6967 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6968     struct sctp_association *asoc,
6969     struct sctp_tmit_chunk **data_list,
6970     int bundle_at,
6971     struct sctp_nets *net)
6972 {
6973         int i;
6974         struct sctp_tmit_chunk *tp1;
6975
6976         for (i = 0; i < bundle_at; i++) {
6977                 /* off of the send queue */
6978                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6979                 asoc->send_queue_cnt--;
6980                 if (i > 0) {
6981                         /*
6982                          * Any chunk NOT 0 you zap the time chunk 0 gets
6983                          * zapped or set based on if a RTO measurment is
6984                          * needed.
6985                          */
6986                         data_list[i]->do_rtt = 0;
6987                 }
6988                 /* record time */
6989                 data_list[i]->sent_rcv_time = net->last_sent_time;
6990                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6991                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6992                 if (data_list[i]->whoTo == NULL) {
6993                         data_list[i]->whoTo = net;
6994                         atomic_add_int(&net->ref_count, 1);
6995                 }
6996                 /* on to the sent queue */
6997                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6998                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6999                         struct sctp_tmit_chunk *tpp;
7000
7001                         /* need to move back */
7002         back_up_more:
7003                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7004                         if (tpp == NULL) {
7005                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7006                                 goto all_done;
7007                         }
7008                         tp1 = tpp;
7009                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7010                                 goto back_up_more;
7011                         }
7012                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7013                 } else {
7014                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7015                             data_list[i],
7016                             sctp_next);
7017                 }
7018 all_done:
7019                 /* This does not lower until the cum-ack passes it */
7020                 asoc->sent_queue_cnt++;
7021                 if ((asoc->peers_rwnd <= 0) &&
7022                     (asoc->total_flight == 0) &&
7023                     (bundle_at == 1)) {
7024                         /* Mark the chunk as being a window probe */
7025                         SCTP_STAT_INCR(sctps_windowprobed);
7026                 }
7027 #ifdef SCTP_AUDITING_ENABLED
7028                 sctp_audit_log(0xC2, 3);
7029 #endif
7030                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7031                 data_list[i]->snd_count = 1;
7032                 data_list[i]->rec.data.chunk_was_revoked = 0;
7033                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7034                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7035                             data_list[i]->whoTo->flight_size,
7036                             data_list[i]->book_size,
7037                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7038                             data_list[i]->rec.data.tsn);
7039                 }
7040                 sctp_flight_size_increase(data_list[i]);
7041                 sctp_total_flight_increase(stcb, data_list[i]);
7042                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7043                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7044                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7045                 }
7046                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7047                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7048                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7049                         /* SWS sender side engages */
7050                         asoc->peers_rwnd = 0;
7051                 }
7052         }
7053         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7054                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7055         }
7056 }
7057
7058 static void
7059 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7060 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7061     SCTP_UNUSED
7062 #endif
7063 )
7064 {
7065         struct sctp_tmit_chunk *chk, *nchk;
7066
7067         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7068                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7069                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7070                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7071                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7072                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7073                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7074                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7075                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7076                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7077                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7078                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7079                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7080                         /* Stray chunks must be cleaned up */
7081         clean_up_anyway:
7082                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7083                         asoc->ctrl_queue_cnt--;
7084                         if (chk->data) {
7085                                 sctp_m_freem(chk->data);
7086                                 chk->data = NULL;
7087                         }
7088                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7089                                 asoc->fwd_tsn_cnt--;
7090                         }
7091                         sctp_free_a_chunk(stcb, chk, so_locked);
7092                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7093                         /* special handling, we must look into the param */
7094                         if (chk != asoc->str_reset) {
7095                                 goto clean_up_anyway;
7096                         }
7097                 }
7098         }
7099 }
7100
7101 static uint32_t
7102 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7103     uint32_t space_left, uint32_t frag_point, int eeor_on)
7104 {
7105         /*
7106          * Make a decision on if I should split a msg into multiple parts.
7107          * This is only asked of incomplete messages.
7108          */
7109         if (eeor_on) {
7110                 /*
7111                  * If we are doing EEOR we need to always send it if its the
7112                  * entire thing, since it might be all the guy is putting in
7113                  * the hopper.
7114                  */
7115                 if (space_left >= length) {
7116                         /*-
7117                          * If we have data outstanding,
7118                          * we get another chance when the sack
7119                          * arrives to transmit - wait for more data
7120                          */
7121                         if (stcb->asoc.total_flight == 0) {
7122                                 /*
7123                                  * If nothing is in flight, we zero the
7124                                  * packet counter.
7125                                  */
7126                                 return (length);
7127                         }
7128                         return (0);
7129
7130                 } else {
7131                         /* You can fill the rest */
7132                         return (space_left);
7133                 }
7134         }
7135         /*-
7136          * For those strange folk that make the send buffer
7137          * smaller than our fragmentation point, we can't
7138          * get a full msg in so we have to allow splitting.
7139          */
7140         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7141                 return (length);
7142         }
7143         if ((length <= space_left) ||
7144             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7145                 /* Sub-optimial residual don't split in non-eeor mode. */
7146                 return (0);
7147         }
7148         /*
7149          * If we reach here length is larger than the space_left. Do we wish
7150          * to split it for the sake of packet putting together?
7151          */
7152         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7153                 /* Its ok to split it */
7154                 return (min(space_left, frag_point));
7155         }
7156         /* Nope, can't split */
7157         return (0);
7158 }
7159
7160 static uint32_t
7161 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7162     struct sctp_stream_out *strq,
7163     uint32_t space_left,
7164     uint32_t frag_point,
7165     int *giveup,
7166     int eeor_mode,
7167     int *bail,
7168     int so_locked
7169 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7170     SCTP_UNUSED
7171 #endif
7172 )
7173 {
7174         /* Move from the stream to the send_queue keeping track of the total */
7175         struct sctp_association *asoc;
7176         struct sctp_stream_queue_pending *sp;
7177         struct sctp_tmit_chunk *chk;
7178         struct sctp_data_chunk *dchkh = NULL;
7179         struct sctp_idata_chunk *ndchkh = NULL;
7180         uint32_t to_move, length;
7181         int leading;
7182         uint8_t rcv_flags = 0;
7183         uint8_t some_taken;
7184         uint8_t send_lock_up = 0;
7185
7186         SCTP_TCB_LOCK_ASSERT(stcb);
7187         asoc = &stcb->asoc;
7188 one_more_time:
7189         /* sa_ignore FREED_MEMORY */
7190         sp = TAILQ_FIRST(&strq->outqueue);
7191         if (sp == NULL) {
7192                 if (send_lock_up == 0) {
7193                         SCTP_TCB_SEND_LOCK(stcb);
7194                         send_lock_up = 1;
7195                 }
7196                 sp = TAILQ_FIRST(&strq->outqueue);
7197                 if (sp) {
7198                         goto one_more_time;
7199                 }
7200                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7201                     (stcb->asoc.idata_supported == 0) &&
7202                     (strq->last_msg_incomplete)) {
7203                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7204                             strq->sid,
7205                             strq->last_msg_incomplete);
7206                         strq->last_msg_incomplete = 0;
7207                 }
7208                 to_move = 0;
7209                 if (send_lock_up) {
7210                         SCTP_TCB_SEND_UNLOCK(stcb);
7211                         send_lock_up = 0;
7212                 }
7213                 goto out_of;
7214         }
7215         if ((sp->msg_is_complete) && (sp->length == 0)) {
7216                 if (sp->sender_all_done) {
7217                         /*
7218                          * We are doing differed cleanup. Last time through
7219                          * when we took all the data the sender_all_done was
7220                          * not set.
7221                          */
7222                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7223                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7224                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7225                                     sp->sender_all_done,
7226                                     sp->length,
7227                                     sp->msg_is_complete,
7228                                     sp->put_last_out,
7229                                     send_lock_up);
7230                         }
7231                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7232                                 SCTP_TCB_SEND_LOCK(stcb);
7233                                 send_lock_up = 1;
7234                         }
7235                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7236                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7237                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7238                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7239                             (strq->chunks_on_queues == 0) &&
7240                             TAILQ_EMPTY(&strq->outqueue)) {
7241                                 stcb->asoc.trigger_reset = 1;
7242                         }
7243                         if (sp->net) {
7244                                 sctp_free_remote_addr(sp->net);
7245                                 sp->net = NULL;
7246                         }
7247                         if (sp->data) {
7248                                 sctp_m_freem(sp->data);
7249                                 sp->data = NULL;
7250                         }
7251                         sctp_free_a_strmoq(stcb, sp, so_locked);
7252                         /* we can't be locked to it */
7253                         if (send_lock_up) {
7254                                 SCTP_TCB_SEND_UNLOCK(stcb);
7255                                 send_lock_up = 0;
7256                         }
7257                         /* back to get the next msg */
7258                         goto one_more_time;
7259                 } else {
7260                         /*
7261                          * sender just finished this but still holds a
7262                          * reference
7263                          */
7264                         *giveup = 1;
7265                         to_move = 0;
7266                         goto out_of;
7267                 }
7268         } else {
7269                 /* is there some to get */
7270                 if (sp->length == 0) {
7271                         /* no */
7272                         *giveup = 1;
7273                         to_move = 0;
7274                         goto out_of;
7275                 } else if (sp->discard_rest) {
7276                         if (send_lock_up == 0) {
7277                                 SCTP_TCB_SEND_LOCK(stcb);
7278                                 send_lock_up = 1;
7279                         }
7280                         /* Whack down the size */
7281                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7282                         if ((stcb->sctp_socket != NULL) &&
7283                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7284                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7285                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7286                         }
7287                         if (sp->data) {
7288                                 sctp_m_freem(sp->data);
7289                                 sp->data = NULL;
7290                                 sp->tail_mbuf = NULL;
7291                         }
7292                         sp->length = 0;
7293                         sp->some_taken = 1;
7294                         *giveup = 1;
7295                         to_move = 0;
7296                         goto out_of;
7297                 }
7298         }
7299         some_taken = sp->some_taken;
7300 re_look:
7301         length = sp->length;
7302         if (sp->msg_is_complete) {
7303                 /* The message is complete */
7304                 to_move = min(length, frag_point);
7305                 if (to_move == length) {
7306                         /* All of it fits in the MTU */
7307                         if (sp->some_taken) {
7308                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7309                         } else {
7310                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7311                         }
7312                         sp->put_last_out = 1;
7313                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7314                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7315                         }
7316                 } else {
7317                         /* Not all of it fits, we fragment */
7318                         if (sp->some_taken == 0) {
7319                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7320                         }
7321                         sp->some_taken = 1;
7322                 }
7323         } else {
7324                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7325                 if (to_move) {
7326                         /*-
7327                          * We use a snapshot of length in case it
7328                          * is expanding during the compare.
7329                          */
7330                         uint32_t llen;
7331
7332                         llen = length;
7333                         if (to_move >= llen) {
7334                                 to_move = llen;
7335                                 if (send_lock_up == 0) {
7336                                         /*-
7337                                          * We are taking all of an incomplete msg
7338                                          * thus we need a send lock.
7339                                          */
7340                                         SCTP_TCB_SEND_LOCK(stcb);
7341                                         send_lock_up = 1;
7342                                         if (sp->msg_is_complete) {
7343                                                 /*
7344                                                  * the sender finished the
7345                                                  * msg
7346                                                  */
7347                                                 goto re_look;
7348                                         }
7349                                 }
7350                         }
7351                         if (sp->some_taken == 0) {
7352                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7353                                 sp->some_taken = 1;
7354                         }
7355                 } else {
7356                         /* Nothing to take. */
7357                         *giveup = 1;
7358                         to_move = 0;
7359                         goto out_of;
7360                 }
7361         }
7362
7363         /* If we reach here, we can copy out a chunk */
7364         sctp_alloc_a_chunk(stcb, chk);
7365         if (chk == NULL) {
7366                 /* No chunk memory */
7367                 *giveup = 1;
7368                 to_move = 0;
7369                 goto out_of;
7370         }
7371         /*
7372          * Setup for unordered if needed by looking at the user sent info
7373          * flags.
7374          */
7375         if (sp->sinfo_flags & SCTP_UNORDERED) {
7376                 rcv_flags |= SCTP_DATA_UNORDERED;
7377         }
7378         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7379             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7380                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7381         }
7382         /* clear out the chunk before setting up */
7383         memset(chk, 0, sizeof(*chk));
7384         chk->rec.data.rcv_flags = rcv_flags;
7385
7386         if (to_move >= length) {
7387                 /* we think we can steal the whole thing */
7388                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7389                         SCTP_TCB_SEND_LOCK(stcb);
7390                         send_lock_up = 1;
7391                 }
7392                 if (to_move < sp->length) {
7393                         /* bail, it changed */
7394                         goto dont_do_it;
7395                 }
7396                 chk->data = sp->data;
7397                 chk->last_mbuf = sp->tail_mbuf;
7398                 /* register the stealing */
7399                 sp->data = sp->tail_mbuf = NULL;
7400         } else {
7401                 struct mbuf *m;
7402
7403 dont_do_it:
7404                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7405                 chk->last_mbuf = NULL;
7406                 if (chk->data == NULL) {
7407                         sp->some_taken = some_taken;
7408                         sctp_free_a_chunk(stcb, chk, so_locked);
7409                         *bail = 1;
7410                         to_move = 0;
7411                         goto out_of;
7412                 }
7413 #ifdef SCTP_MBUF_LOGGING
7414                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7415                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7416                 }
7417 #endif
7418                 /* Pull off the data */
7419                 m_adj(sp->data, to_move);
7420                 /* Now lets work our way down and compact it */
7421                 m = sp->data;
7422                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7423                         sp->data = SCTP_BUF_NEXT(m);
7424                         SCTP_BUF_NEXT(m) = NULL;
7425                         if (sp->tail_mbuf == m) {
7426                                 /*-
7427                                  * Freeing tail? TSNH since
7428                                  * we supposedly were taking less
7429                                  * than the sp->length.
7430                                  */
7431 #ifdef INVARIANTS
7432                                 panic("Huh, freing tail? - TSNH");
7433 #else
7434                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7435                                 sp->tail_mbuf = sp->data = NULL;
7436                                 sp->length = 0;
7437 #endif
7438
7439                         }
7440                         sctp_m_free(m);
7441                         m = sp->data;
7442                 }
7443         }
7444         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7445                 chk->copy_by_ref = 1;
7446         } else {
7447                 chk->copy_by_ref = 0;
7448         }
7449         /*
7450          * get last_mbuf and counts of mb usage This is ugly but hopefully
7451          * its only one mbuf.
7452          */
7453         if (chk->last_mbuf == NULL) {
7454                 chk->last_mbuf = chk->data;
7455                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7456                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7457                 }
7458         }
7459
7460         if (to_move > length) {
7461                 /*- This should not happen either
7462                  * since we always lower to_move to the size
7463                  * of sp->length if its larger.
7464                  */
7465 #ifdef INVARIANTS
7466                 panic("Huh, how can to_move be larger?");
7467 #else
7468                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7469                 sp->length = 0;
7470 #endif
7471         } else {
7472                 atomic_subtract_int(&sp->length, to_move);
7473         }
7474         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7475         if (M_LEADINGSPACE(chk->data) < leading) {
7476                 /* Not enough room for a chunk header, get some */
7477                 struct mbuf *m;
7478
7479                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7480                 if (m == NULL) {
7481                         /*
7482                          * we're in trouble here. _PREPEND below will free
7483                          * all the data if there is no leading space, so we
7484                          * must put the data back and restore.
7485                          */
7486                         if (send_lock_up == 0) {
7487                                 SCTP_TCB_SEND_LOCK(stcb);
7488                                 send_lock_up = 1;
7489                         }
7490                         if (sp->data == NULL) {
7491                                 /* unsteal the data */
7492                                 sp->data = chk->data;
7493                                 sp->tail_mbuf = chk->last_mbuf;
7494                         } else {
7495                                 struct mbuf *m_tmp;
7496
7497                                 /* reassemble the data */
7498                                 m_tmp = sp->data;
7499                                 sp->data = chk->data;
7500                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7501                         }
7502                         sp->some_taken = some_taken;
7503                         atomic_add_int(&sp->length, to_move);
7504                         chk->data = NULL;
7505                         *bail = 1;
7506                         sctp_free_a_chunk(stcb, chk, so_locked);
7507                         to_move = 0;
7508                         goto out_of;
7509                 } else {
7510                         SCTP_BUF_LEN(m) = 0;
7511                         SCTP_BUF_NEXT(m) = chk->data;
7512                         chk->data = m;
7513                         M_ALIGN(chk->data, 4);
7514                 }
7515         }
7516         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7517         if (chk->data == NULL) {
7518                 /* HELP, TSNH since we assured it would not above? */
7519 #ifdef INVARIANTS
7520                 panic("prepend failes HELP?");
7521 #else
7522                 SCTP_PRINTF("prepend fails HELP?\n");
7523                 sctp_free_a_chunk(stcb, chk, so_locked);
7524 #endif
7525                 *bail = 1;
7526                 to_move = 0;
7527                 goto out_of;
7528         }
7529         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7530         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7531         chk->book_size_scale = 0;
7532         chk->sent = SCTP_DATAGRAM_UNSENT;
7533
7534         chk->flags = 0;
7535         chk->asoc = &stcb->asoc;
7536         chk->pad_inplace = 0;
7537         chk->no_fr_allowed = 0;
7538         if (stcb->asoc.idata_supported == 0) {
7539                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7540                         /* Just use 0. The receiver ignores the values. */
7541                         chk->rec.data.mid = 0;
7542                 } else {
7543                         chk->rec.data.mid = strq->next_mid_ordered;
7544                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7545                                 strq->next_mid_ordered++;
7546                         }
7547                 }
7548         } else {
7549                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7550                         chk->rec.data.mid = strq->next_mid_unordered;
7551                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7552                                 strq->next_mid_unordered++;
7553                         }
7554                 } else {
7555                         chk->rec.data.mid = strq->next_mid_ordered;
7556                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7557                                 strq->next_mid_ordered++;
7558                         }
7559                 }
7560         }
7561         chk->rec.data.sid = sp->sid;
7562         chk->rec.data.ppid = sp->ppid;
7563         chk->rec.data.context = sp->context;
7564         chk->rec.data.doing_fast_retransmit = 0;
7565
7566         chk->rec.data.timetodrop = sp->ts;
7567         chk->flags = sp->act_flags;
7568
7569         if (sp->net) {
7570                 chk->whoTo = sp->net;
7571                 atomic_add_int(&chk->whoTo->ref_count, 1);
7572         } else
7573                 chk->whoTo = NULL;
7574
7575         if (sp->holds_key_ref) {
7576                 chk->auth_keyid = sp->auth_keyid;
7577                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7578                 chk->holds_key_ref = 1;
7579         }
7580         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7581         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7582                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7583                     (uint32_t)(uintptr_t)stcb, sp->length,
7584                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7585                     chk->rec.data.tsn);
7586         }
7587         if (stcb->asoc.idata_supported == 0) {
7588                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7589         } else {
7590                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7591         }
7592         /*
7593          * Put the rest of the things in place now. Size was done earlier in
7594          * previous loop prior to padding.
7595          */
7596
7597 #ifdef SCTP_ASOCLOG_OF_TSNS
7598         SCTP_TCB_LOCK_ASSERT(stcb);
7599         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7600                 asoc->tsn_out_at = 0;
7601                 asoc->tsn_out_wrapped = 1;
7602         }
7603         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7604         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7605         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7606         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7607         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7608         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7609         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7610         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7611         asoc->tsn_out_at++;
7612 #endif
7613         if (stcb->asoc.idata_supported == 0) {
7614                 dchkh->ch.chunk_type = SCTP_DATA;
7615                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7616                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7617                 dchkh->dp.sid = htons(strq->sid);
7618                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7619                 dchkh->dp.ppid = chk->rec.data.ppid;
7620                 dchkh->ch.chunk_length = htons(chk->send_size);
7621         } else {
7622                 ndchkh->ch.chunk_type = SCTP_IDATA;
7623                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7624                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7625                 ndchkh->dp.sid = htons(strq->sid);
7626                 ndchkh->dp.reserved = htons(0);
7627                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7628                 if (sp->fsn == 0)
7629                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7630                 else
7631                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7632                 sp->fsn++;
7633                 ndchkh->ch.chunk_length = htons(chk->send_size);
7634         }
7635         /* Now advance the chk->send_size by the actual pad needed. */
7636         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7637                 /* need a pad */
7638                 struct mbuf *lm;
7639                 int pads;
7640
7641                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7642                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7643                 if (lm != NULL) {
7644                         chk->last_mbuf = lm;
7645                         chk->pad_inplace = 1;
7646                 }
7647                 chk->send_size += pads;
7648         }
7649         if (PR_SCTP_ENABLED(chk->flags)) {
7650                 asoc->pr_sctp_cnt++;
7651         }
7652         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7653                 /* All done pull and kill the message */
7654                 if (sp->put_last_out == 0) {
7655                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7656                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7657                             sp->sender_all_done,
7658                             sp->length,
7659                             sp->msg_is_complete,
7660                             sp->put_last_out,
7661                             send_lock_up);
7662                 }
7663                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7664                         SCTP_TCB_SEND_LOCK(stcb);
7665                         send_lock_up = 1;
7666                 }
7667                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7668                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7669                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7670                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7671                     (strq->chunks_on_queues == 0) &&
7672                     TAILQ_EMPTY(&strq->outqueue)) {
7673                         stcb->asoc.trigger_reset = 1;
7674                 }
7675                 if (sp->net) {
7676                         sctp_free_remote_addr(sp->net);
7677                         sp->net = NULL;
7678                 }
7679                 if (sp->data) {
7680                         sctp_m_freem(sp->data);
7681                         sp->data = NULL;
7682                 }
7683                 sctp_free_a_strmoq(stcb, sp, so_locked);
7684         }
7685         asoc->chunks_on_out_queue++;
7686         strq->chunks_on_queues++;
7687         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7688         asoc->send_queue_cnt++;
7689 out_of:
7690         if (send_lock_up) {
7691                 SCTP_TCB_SEND_UNLOCK(stcb);
7692         }
7693         return (to_move);
7694 }
7695
7696
7697 static void
7698 sctp_fill_outqueue(struct sctp_tcb *stcb,
7699     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7700 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7701     SCTP_UNUSED
7702 #endif
7703 )
7704 {
7705         struct sctp_association *asoc;
7706         struct sctp_stream_out *strq;
7707         uint32_t space_left, moved, total_moved;
7708         int bail, giveup;
7709
7710         SCTP_TCB_LOCK_ASSERT(stcb);
7711         asoc = &stcb->asoc;
7712         total_moved = 0;
7713         switch (net->ro._l_addr.sa.sa_family) {
7714 #ifdef INET
7715         case AF_INET:
7716                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7717                 break;
7718 #endif
7719 #ifdef INET6
7720         case AF_INET6:
7721                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7722                 break;
7723 #endif
7724         default:
7725                 /* TSNH */
7726                 space_left = net->mtu;
7727                 break;
7728         }
7729         /* Need an allowance for the data chunk header too */
7730         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7731
7732         /* must make even word boundary */
7733         space_left &= 0xfffffffc;
7734         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7735         giveup = 0;
7736         bail = 0;
7737         while ((space_left > 0) && (strq != NULL)) {
7738                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7739                     &giveup, eeor_mode, &bail, so_locked);
7740                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7741                 if ((giveup != 0) || (bail != 0)) {
7742                         break;
7743                 }
7744                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7745                 total_moved += moved;
7746                 space_left -= moved;
7747                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7748                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7749                 } else {
7750                         space_left = 0;
7751                 }
7752                 space_left &= 0xfffffffc;
7753         }
7754         if (bail != 0)
7755                 *quit_now = 1;
7756
7757         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7758
7759         if (total_moved == 0) {
7760                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7761                     (net == stcb->asoc.primary_destination)) {
7762                         /* ran dry for primary network net */
7763                         SCTP_STAT_INCR(sctps_primary_randry);
7764                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7765                         /* ran dry with CMT on */
7766                         SCTP_STAT_INCR(sctps_cmt_randry);
7767                 }
7768         }
7769 }
7770
7771 void
7772 sctp_fix_ecn_echo(struct sctp_association *asoc)
7773 {
7774         struct sctp_tmit_chunk *chk;
7775
7776         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7777                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7778                         chk->sent = SCTP_DATAGRAM_UNSENT;
7779                 }
7780         }
7781 }
7782
7783 void
7784 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7785 {
7786         struct sctp_association *asoc;
7787         struct sctp_tmit_chunk *chk;
7788         struct sctp_stream_queue_pending *sp;
7789         unsigned int i;
7790
7791         if (net == NULL) {
7792                 return;
7793         }
7794         asoc = &stcb->asoc;
7795         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7796                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7797                         if (sp->net == net) {
7798                                 sctp_free_remote_addr(sp->net);
7799                                 sp->net = NULL;
7800                         }
7801                 }
7802         }
7803         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7804                 if (chk->whoTo == net) {
7805                         sctp_free_remote_addr(chk->whoTo);
7806                         chk->whoTo = NULL;
7807                 }
7808         }
7809 }
7810
7811 int
7812 sctp_med_chunk_output(struct sctp_inpcb *inp,
7813     struct sctp_tcb *stcb,
7814     struct sctp_association *asoc,
7815     int *num_out,
7816     int *reason_code,
7817     int control_only, int from_where,
7818     struct timeval *now, int *now_filled, int frag_point, int so_locked
7819 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7820     SCTP_UNUSED
7821 #endif
7822 )
7823 {
7824         /**
7825          * Ok this is the generic chunk service queue. we must do the
7826          * following:
7827          * - Service the stream queue that is next, moving any
7828          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7829          *   LAST to the out queue in one pass) and assigning TSN's. This
7830          *   only applys though if the peer does not support NDATA. For NDATA
7831          *   chunks its ok to not send the entire message ;-)
7832          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7833          *   fomulate and send the low level chunks. Making sure to combine
7834          *   any control in the control chunk queue also.
7835          */
7836         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7837         struct mbuf *outchain, *endoutchain;
7838         struct sctp_tmit_chunk *chk, *nchk;
7839
7840         /* temp arrays for unlinking */
7841         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7842         int no_fragmentflg, error;
7843         unsigned int max_rwnd_per_dest, max_send_per_dest;
7844         int one_chunk, hbflag, skip_data_for_this_net;
7845         int asconf, cookie, no_out_cnt;
7846         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7847         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7848         int tsns_sent = 0;
7849         uint32_t auth_offset = 0;
7850         struct sctp_auth_chunk *auth = NULL;
7851         uint16_t auth_keyid;
7852         int override_ok = 1;
7853         int skip_fill_up = 0;
7854         int data_auth_reqd = 0;
7855
7856         /*
7857          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7858          * destination.
7859          */
7860         int quit_now = 0;
7861
7862         *num_out = 0;
7863         *reason_code = 0;
7864         auth_keyid = stcb->asoc.authinfo.active_keyid;
7865         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7866             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7867             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7868                 eeor_mode = 1;
7869         } else {
7870                 eeor_mode = 0;
7871         }
7872         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7873         /*
7874          * First lets prime the pump. For each destination, if there is room
7875          * in the flight size, attempt to pull an MTU's worth out of the
7876          * stream queues into the general send_queue
7877          */
7878 #ifdef SCTP_AUDITING_ENABLED
7879         sctp_audit_log(0xC2, 2);
7880 #endif
7881         SCTP_TCB_LOCK_ASSERT(stcb);
7882         hbflag = 0;
7883         if (control_only)
7884                 no_data_chunks = 1;
7885         else
7886                 no_data_chunks = 0;
7887
7888         /* Nothing to possible to send? */
7889         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7890             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7891             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7892             TAILQ_EMPTY(&asoc->send_queue) &&
7893             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7894 nothing_to_send:
7895                 *reason_code = 9;
7896                 return (0);
7897         }
7898         if (asoc->peers_rwnd == 0) {
7899                 /* No room in peers rwnd */
7900                 *reason_code = 1;
7901                 if (asoc->total_flight > 0) {
7902                         /* we are allowed one chunk in flight */
7903                         no_data_chunks = 1;
7904                 }
7905         }
7906         if (stcb->asoc.ecn_echo_cnt_onq) {
7907                 /* Record where a sack goes, if any */
7908                 if (no_data_chunks &&
7909                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7910                         /* Nothing but ECNe to send - we don't do that */
7911                         goto nothing_to_send;
7912                 }
7913                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7914                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7915                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7916                                 sack_goes_to = chk->whoTo;
7917                                 break;
7918                         }
7919                 }
7920         }
7921         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7922         if (stcb->sctp_socket)
7923                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7924         else
7925                 max_send_per_dest = 0;
7926         if (no_data_chunks == 0) {
7927                 /* How many non-directed chunks are there? */
7928                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7929                         if (chk->whoTo == NULL) {
7930                                 /*
7931                                  * We already have non-directed chunks on
7932                                  * the queue, no need to do a fill-up.
7933                                  */
7934                                 skip_fill_up = 1;
7935                                 break;
7936                         }
7937                 }
7938
7939         }
7940         if ((no_data_chunks == 0) &&
7941             (skip_fill_up == 0) &&
7942             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7943                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7944                         /*
7945                          * This for loop we are in takes in each net, if
7946                          * its's got space in cwnd and has data sent to it
7947                          * (when CMT is off) then it calls
7948                          * sctp_fill_outqueue for the net. This gets data on
7949                          * the send queue for that network.
7950                          *
7951                          * In sctp_fill_outqueue TSN's are assigned and data
7952                          * is copied out of the stream buffers. Note mostly
7953                          * copy by reference (we hope).
7954                          */
7955                         net->window_probe = 0;
7956                         if ((net != stcb->asoc.alternate) &&
7957                             ((net->dest_state & SCTP_ADDR_PF) ||
7958                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7959                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7960                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7961                                         sctp_log_cwnd(stcb, net, 1,
7962                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7963                                 }
7964                                 continue;
7965                         }
7966                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7967                             (net->flight_size == 0)) {
7968                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7969                         }
7970                         if (net->flight_size >= net->cwnd) {
7971                                 /* skip this network, no room - can't fill */
7972                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7973                                         sctp_log_cwnd(stcb, net, 3,
7974                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7975                                 }
7976                                 continue;
7977                         }
7978                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7979                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7980                         }
7981                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7982                         if (quit_now) {
7983                                 /* memory alloc failure */
7984                                 no_data_chunks = 1;
7985                                 break;
7986                         }
7987                 }
7988         }
7989         /* now service each destination and send out what we can for it */
7990         /* Nothing to send? */
7991         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7992             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7993             TAILQ_EMPTY(&asoc->send_queue)) {
7994                 *reason_code = 8;
7995                 return (0);
7996         }
7997
7998         if (asoc->sctp_cmt_on_off > 0) {
7999                 /* get the last start point */
8000                 start_at = asoc->last_net_cmt_send_started;
8001                 if (start_at == NULL) {
8002                         /* null so to beginning */
8003                         start_at = TAILQ_FIRST(&asoc->nets);
8004                 } else {
8005                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8006                         if (start_at == NULL) {
8007                                 start_at = TAILQ_FIRST(&asoc->nets);
8008                         }
8009                 }
8010                 asoc->last_net_cmt_send_started = start_at;
8011         } else {
8012                 start_at = TAILQ_FIRST(&asoc->nets);
8013         }
8014         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8015                 if (chk->whoTo == NULL) {
8016                         if (asoc->alternate) {
8017                                 chk->whoTo = asoc->alternate;
8018                         } else {
8019                                 chk->whoTo = asoc->primary_destination;
8020                         }
8021                         atomic_add_int(&chk->whoTo->ref_count, 1);
8022                 }
8023         }
8024         old_start_at = NULL;
8025 again_one_more_time:
8026         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8027                 /* how much can we send? */
8028                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8029                 if (old_start_at && (old_start_at == net)) {
8030                         /* through list ocmpletely. */
8031                         break;
8032                 }
8033                 tsns_sent = 0xa;
8034                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8035                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8036                     (net->flight_size >= net->cwnd)) {
8037                         /*
8038                          * Nothing on control or asconf and flight is full,
8039                          * we can skip even in the CMT case.
8040                          */
8041                         continue;
8042                 }
8043                 bundle_at = 0;
8044                 endoutchain = outchain = NULL;
8045                 no_fragmentflg = 1;
8046                 one_chunk = 0;
8047                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8048                         skip_data_for_this_net = 1;
8049                 } else {
8050                         skip_data_for_this_net = 0;
8051                 }
8052                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8053 #ifdef INET
8054                 case AF_INET:
8055                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8056                         break;
8057 #endif
8058 #ifdef INET6
8059                 case AF_INET6:
8060                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8061                         break;
8062 #endif
8063                 default:
8064                         /* TSNH */
8065                         mtu = net->mtu;
8066                         break;
8067                 }
8068                 mx_mtu = mtu;
8069                 to_out = 0;
8070                 if (mtu > asoc->peers_rwnd) {
8071                         if (asoc->total_flight > 0) {
8072                                 /* We have a packet in flight somewhere */
8073                                 r_mtu = asoc->peers_rwnd;
8074                         } else {
8075                                 /* We are always allowed to send one MTU out */
8076                                 one_chunk = 1;
8077                                 r_mtu = mtu;
8078                         }
8079                 } else {
8080                         r_mtu = mtu;
8081                 }
8082                 error = 0;
8083                 /************************/
8084                 /* ASCONF transmission */
8085                 /************************/
8086                 /* Now first lets go through the asconf queue */
8087                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8088                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8089                                 continue;
8090                         }
8091                         if (chk->whoTo == NULL) {
8092                                 if (asoc->alternate == NULL) {
8093                                         if (asoc->primary_destination != net) {
8094                                                 break;
8095                                         }
8096                                 } else {
8097                                         if (asoc->alternate != net) {
8098                                                 break;
8099                                         }
8100                                 }
8101                         } else {
8102                                 if (chk->whoTo != net) {
8103                                         break;
8104                                 }
8105                         }
8106                         if (chk->data == NULL) {
8107                                 break;
8108                         }
8109                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8110                             chk->sent != SCTP_DATAGRAM_RESEND) {
8111                                 break;
8112                         }
8113                         /*
8114                          * if no AUTH is yet included and this chunk
8115                          * requires it, make sure to account for it.  We
8116                          * don't apply the size until the AUTH chunk is
8117                          * actually added below in case there is no room for
8118                          * this chunk. NOTE: we overload the use of "omtu"
8119                          * here
8120                          */
8121                         if ((auth == NULL) &&
8122                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8123                             stcb->asoc.peer_auth_chunks)) {
8124                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8125                         } else
8126                                 omtu = 0;
8127                         /* Here we do NOT factor the r_mtu */
8128                         if ((chk->send_size < (int)(mtu - omtu)) ||
8129                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8130                                 /*
8131                                  * We probably should glom the mbuf chain
8132                                  * from the chk->data for control but the
8133                                  * problem is it becomes yet one more level
8134                                  * of tracking to do if for some reason
8135                                  * output fails. Then I have got to
8136                                  * reconstruct the merged control chain.. el
8137                                  * yucko.. for now we take the easy way and
8138                                  * do the copy
8139                                  */
8140                                 /*
8141                                  * Add an AUTH chunk, if chunk requires it
8142                                  * save the offset into the chain for AUTH
8143                                  */
8144                                 if ((auth == NULL) &&
8145                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8146                                     stcb->asoc.peer_auth_chunks))) {
8147                                         outchain = sctp_add_auth_chunk(outchain,
8148                                             &endoutchain,
8149                                             &auth,
8150                                             &auth_offset,
8151                                             stcb,
8152                                             chk->rec.chunk_id.id);
8153                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8154                                 }
8155                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8156                                     (int)chk->rec.chunk_id.can_take_data,
8157                                     chk->send_size, chk->copy_by_ref);
8158                                 if (outchain == NULL) {
8159                                         *reason_code = 8;
8160                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8161                                         return (ENOMEM);
8162                                 }
8163                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8164                                 /* update our MTU size */
8165                                 if (mtu > (chk->send_size + omtu))
8166                                         mtu -= (chk->send_size + omtu);
8167                                 else
8168                                         mtu = 0;
8169                                 to_out += (chk->send_size + omtu);
8170                                 /* Do clear IP_DF ? */
8171                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8172                                         no_fragmentflg = 0;
8173                                 }
8174                                 if (chk->rec.chunk_id.can_take_data)
8175                                         chk->data = NULL;
8176                                 /*
8177                                  * set hb flag since we can use these for
8178                                  * RTO
8179                                  */
8180                                 hbflag = 1;
8181                                 asconf = 1;
8182                                 /*
8183                                  * should sysctl this: don't bundle data
8184                                  * with ASCONF since it requires AUTH
8185                                  */
8186                                 no_data_chunks = 1;
8187                                 chk->sent = SCTP_DATAGRAM_SENT;
8188                                 if (chk->whoTo == NULL) {
8189                                         chk->whoTo = net;
8190                                         atomic_add_int(&net->ref_count, 1);
8191                                 }
8192                                 chk->snd_count++;
8193                                 if (mtu == 0) {
8194                                         /*
8195                                          * Ok we are out of room but we can
8196                                          * output without effecting the
8197                                          * flight size since this little guy
8198                                          * is a control only packet.
8199                                          */
8200                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8201                                         /*
8202                                          * do NOT clear the asconf flag as
8203                                          * it is used to do appropriate
8204                                          * source address selection.
8205                                          */
8206                                         if (*now_filled == 0) {
8207                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8208                                                 *now_filled = 1;
8209                                         }
8210                                         net->last_sent_time = *now;
8211                                         hbflag = 0;
8212                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8213                                             (struct sockaddr *)&net->ro._l_addr,
8214                                             outchain, auth_offset, auth,
8215                                             stcb->asoc.authinfo.active_keyid,
8216                                             no_fragmentflg, 0, asconf,
8217                                             inp->sctp_lport, stcb->rport,
8218                                             htonl(stcb->asoc.peer_vtag),
8219                                             net->port, NULL,
8220                                             0, 0,
8221                                             so_locked))) {
8222                                                 /*
8223                                                  * error, we could not
8224                                                  * output
8225                                                  */
8226                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8227                                                 if (from_where == 0) {
8228                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8229                                                 }
8230                                                 if (error == ENOBUFS) {
8231                                                         asoc->ifp_had_enobuf = 1;
8232                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8233                                                 }
8234                                                 /* error, could not output */
8235                                                 if (error == EHOSTUNREACH) {
8236                                                         /*
8237                                                          * Destination went
8238                                                          * unreachable
8239                                                          * during this send
8240                                                          */
8241                                                         sctp_move_chunks_from_net(stcb, net);
8242                                                 }
8243                                                 *reason_code = 7;
8244                                                 break;
8245                                         } else {
8246                                                 asoc->ifp_had_enobuf = 0;
8247                                         }
8248                                         /*
8249                                          * increase the number we sent, if a
8250                                          * cookie is sent we don't tell them
8251                                          * any was sent out.
8252                                          */
8253                                         outchain = endoutchain = NULL;
8254                                         auth = NULL;
8255                                         auth_offset = 0;
8256                                         if (!no_out_cnt)
8257                                                 *num_out += ctl_cnt;
8258                                         /* recalc a clean slate and setup */
8259                                         switch (net->ro._l_addr.sa.sa_family) {
8260 #ifdef INET
8261                                         case AF_INET:
8262                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8263                                                 break;
8264 #endif
8265 #ifdef INET6
8266                                         case AF_INET6:
8267                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8268                                                 break;
8269 #endif
8270                                         default:
8271                                                 /* TSNH */
8272                                                 mtu = net->mtu;
8273                                                 break;
8274                                         }
8275                                         to_out = 0;
8276                                         no_fragmentflg = 1;
8277                                 }
8278                         }
8279                 }
8280                 if (error != 0) {
8281                         /* try next net */
8282                         continue;
8283                 }
8284                 /************************/
8285                 /* Control transmission */
8286                 /************************/
8287                 /* Now first lets go through the control queue */
8288                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8289                         if ((sack_goes_to) &&
8290                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8291                             (chk->whoTo != sack_goes_to)) {
8292                                 /*
8293                                  * if we have a sack in queue, and we are
8294                                  * looking at an ecn echo that is NOT queued
8295                                  * to where the sack is going..
8296                                  */
8297                                 if (chk->whoTo == net) {
8298                                         /*
8299                                          * Don't transmit it to where its
8300                                          * going (current net)
8301                                          */
8302                                         continue;
8303                                 } else if (sack_goes_to == net) {
8304                                         /*
8305                                          * But do transmit it to this
8306                                          * address
8307                                          */
8308                                         goto skip_net_check;
8309                                 }
8310                         }
8311                         if (chk->whoTo == NULL) {
8312                                 if (asoc->alternate == NULL) {
8313                                         if (asoc->primary_destination != net) {
8314                                                 continue;
8315                                         }
8316                                 } else {
8317                                         if (asoc->alternate != net) {
8318                                                 continue;
8319                                         }
8320                                 }
8321                         } else {
8322                                 if (chk->whoTo != net) {
8323                                         continue;
8324                                 }
8325                         }
8326         skip_net_check:
8327                         if (chk->data == NULL) {
8328                                 continue;
8329                         }
8330                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8331                                 /*
8332                                  * It must be unsent. Cookies and ASCONF's
8333                                  * hang around but there timers will force
8334                                  * when marked for resend.
8335                                  */
8336                                 continue;
8337                         }
8338                         /*
8339                          * if no AUTH is yet included and this chunk
8340                          * requires it, make sure to account for it.  We
8341                          * don't apply the size until the AUTH chunk is
8342                          * actually added below in case there is no room for
8343                          * this chunk. NOTE: we overload the use of "omtu"
8344                          * here
8345                          */
8346                         if ((auth == NULL) &&
8347                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8348                             stcb->asoc.peer_auth_chunks)) {
8349                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8350                         } else
8351                                 omtu = 0;
8352                         /* Here we do NOT factor the r_mtu */
8353                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8354                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8355                                 /*
8356                                  * We probably should glom the mbuf chain
8357                                  * from the chk->data for control but the
8358                                  * problem is it becomes yet one more level
8359                                  * of tracking to do if for some reason
8360                                  * output fails. Then I have got to
8361                                  * reconstruct the merged control chain.. el
8362                                  * yucko.. for now we take the easy way and
8363                                  * do the copy
8364                                  */
8365                                 /*
8366                                  * Add an AUTH chunk, if chunk requires it
8367                                  * save the offset into the chain for AUTH
8368                                  */
8369                                 if ((auth == NULL) &&
8370                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8371                                     stcb->asoc.peer_auth_chunks))) {
8372                                         outchain = sctp_add_auth_chunk(outchain,
8373                                             &endoutchain,
8374                                             &auth,
8375                                             &auth_offset,
8376                                             stcb,
8377                                             chk->rec.chunk_id.id);
8378                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8379                                 }
8380                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8381                                     (int)chk->rec.chunk_id.can_take_data,
8382                                     chk->send_size, chk->copy_by_ref);
8383                                 if (outchain == NULL) {
8384                                         *reason_code = 8;
8385                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8386                                         return (ENOMEM);
8387                                 }
8388                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8389                                 /* update our MTU size */
8390                                 if (mtu > (chk->send_size + omtu))
8391                                         mtu -= (chk->send_size + omtu);
8392                                 else
8393                                         mtu = 0;
8394                                 to_out += (chk->send_size + omtu);
8395                                 /* Do clear IP_DF ? */
8396                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8397                                         no_fragmentflg = 0;
8398                                 }
8399                                 if (chk->rec.chunk_id.can_take_data)
8400                                         chk->data = NULL;
8401                                 /* Mark things to be removed, if needed */
8402                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8403                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8404                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8405                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8406                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8407                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8408                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8409                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8410                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8411                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8412                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8413                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8414                                                 hbflag = 1;
8415                                         }
8416                                         /* remove these chunks at the end */
8417                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8418                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8419                                                 /* turn off the timer */
8420                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8421                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8422                                                             inp, stcb, net,
8423                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8424                                                 }
8425                                         }
8426                                         ctl_cnt++;
8427                                 } else {
8428                                         /*
8429                                          * Other chunks, since they have
8430                                          * timers running (i.e. COOKIE) we
8431                                          * just "trust" that it gets sent or
8432                                          * retransmitted.
8433                                          */
8434                                         ctl_cnt++;
8435                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8436                                                 cookie = 1;
8437                                                 no_out_cnt = 1;
8438                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8439                                                 /*
8440                                                  * Increment ecne send count
8441                                                  * here this means we may be
8442                                                  * over-zealous in our
8443                                                  * counting if the send
8444                                                  * fails, but its the best
8445                                                  * place to do it (we used
8446                                                  * to do it in the queue of
8447                                                  * the chunk, but that did
8448                                                  * not tell how many times
8449                                                  * it was sent.
8450                                                  */
8451                                                 SCTP_STAT_INCR(sctps_sendecne);
8452                                         }
8453                                         chk->sent = SCTP_DATAGRAM_SENT;
8454                                         if (chk->whoTo == NULL) {
8455                                                 chk->whoTo = net;
8456                                                 atomic_add_int(&net->ref_count, 1);
8457                                         }
8458                                         chk->snd_count++;
8459                                 }
8460                                 if (mtu == 0) {
8461                                         /*
8462                                          * Ok we are out of room but we can
8463                                          * output without effecting the
8464                                          * flight size since this little guy
8465                                          * is a control only packet.
8466                                          */
8467                                         if (asconf) {
8468                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8469                                                 /*
8470                                                  * do NOT clear the asconf
8471                                                  * flag as it is used to do
8472                                                  * appropriate source
8473                                                  * address selection.
8474                                                  */
8475                                         }
8476                                         if (cookie) {
8477                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8478                                                 cookie = 0;
8479                                         }
8480                                         /* Only HB or ASCONF advances time */
8481                                         if (hbflag) {
8482                                                 if (*now_filled == 0) {
8483                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8484                                                         *now_filled = 1;
8485                                                 }
8486                                                 net->last_sent_time = *now;
8487                                                 hbflag = 0;
8488                                         }
8489                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8490                                             (struct sockaddr *)&net->ro._l_addr,
8491                                             outchain,
8492                                             auth_offset, auth,
8493                                             stcb->asoc.authinfo.active_keyid,
8494                                             no_fragmentflg, 0, asconf,
8495                                             inp->sctp_lport, stcb->rport,
8496                                             htonl(stcb->asoc.peer_vtag),
8497                                             net->port, NULL,
8498                                             0, 0,
8499                                             so_locked))) {
8500                                                 /*
8501                                                  * error, we could not
8502                                                  * output
8503                                                  */
8504                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8505                                                 if (from_where == 0) {
8506                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8507                                                 }
8508                                                 if (error == ENOBUFS) {
8509                                                         asoc->ifp_had_enobuf = 1;
8510                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8511                                                 }
8512                                                 if (error == EHOSTUNREACH) {
8513                                                         /*
8514                                                          * Destination went
8515                                                          * unreachable
8516                                                          * during this send
8517                                                          */
8518                                                         sctp_move_chunks_from_net(stcb, net);
8519                                                 }
8520                                                 *reason_code = 7;
8521                                                 break;
8522                                         } else {
8523                                                 asoc->ifp_had_enobuf = 0;
8524                                         }
8525                                         /*
8526                                          * increase the number we sent, if a
8527                                          * cookie is sent we don't tell them
8528                                          * any was sent out.
8529                                          */
8530                                         outchain = endoutchain = NULL;
8531                                         auth = NULL;
8532                                         auth_offset = 0;
8533                                         if (!no_out_cnt)
8534                                                 *num_out += ctl_cnt;
8535                                         /* recalc a clean slate and setup */
8536                                         switch (net->ro._l_addr.sa.sa_family) {
8537 #ifdef INET
8538                                         case AF_INET:
8539                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8540                                                 break;
8541 #endif
8542 #ifdef INET6
8543                                         case AF_INET6:
8544                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8545                                                 break;
8546 #endif
8547                                         default:
8548                                                 /* TSNH */
8549                                                 mtu = net->mtu;
8550                                                 break;
8551                                         }
8552                                         to_out = 0;
8553                                         no_fragmentflg = 1;
8554                                 }
8555                         }
8556                 }
8557                 if (error != 0) {
8558                         /* try next net */
8559                         continue;
8560                 }
8561                 /* JRI: if dest is in PF state, do not send data to it */
8562                 if ((asoc->sctp_cmt_on_off > 0) &&
8563                     (net != stcb->asoc.alternate) &&
8564                     (net->dest_state & SCTP_ADDR_PF)) {
8565                         goto no_data_fill;
8566                 }
8567                 if (net->flight_size >= net->cwnd) {
8568                         goto no_data_fill;
8569                 }
8570                 if ((asoc->sctp_cmt_on_off > 0) &&
8571                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8572                     (net->flight_size > max_rwnd_per_dest)) {
8573                         goto no_data_fill;
8574                 }
8575                 /*
8576                  * We need a specific accounting for the usage of the send
8577                  * buffer. We also need to check the number of messages per
8578                  * net. For now, this is better than nothing and it disabled
8579                  * by default...
8580                  */
8581                 if ((asoc->sctp_cmt_on_off > 0) &&
8582                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8583                     (max_send_per_dest > 0) &&
8584                     (net->flight_size > max_send_per_dest)) {
8585                         goto no_data_fill;
8586                 }
8587                 /*********************/
8588                 /* Data transmission */
8589                 /*********************/
8590                 /*
8591                  * if AUTH for DATA is required and no AUTH has been added
8592                  * yet, account for this in the mtu now... if no data can be
8593                  * bundled, this adjustment won't matter anyways since the
8594                  * packet will be going out...
8595                  */
8596                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8597                     stcb->asoc.peer_auth_chunks);
8598                 if (data_auth_reqd && (auth == NULL)) {
8599                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8600                 }
8601                 /* now lets add any data within the MTU constraints */
8602                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8603 #ifdef INET
8604                 case AF_INET:
8605                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8606                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8607                         else
8608                                 omtu = 0;
8609                         break;
8610 #endif
8611 #ifdef INET6
8612                 case AF_INET6:
8613                         if (net->mtu > SCTP_MIN_OVERHEAD)
8614                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8615                         else
8616                                 omtu = 0;
8617                         break;
8618 #endif
8619                 default:
8620                         /* TSNH */
8621                         omtu = 0;
8622                         break;
8623                 }
8624                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8625                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8626                     (skip_data_for_this_net == 0)) ||
8627                     (cookie)) {
8628                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8629                                 if (no_data_chunks) {
8630                                         /* let only control go out */
8631                                         *reason_code = 1;
8632                                         break;
8633                                 }
8634                                 if (net->flight_size >= net->cwnd) {
8635                                         /* skip this net, no room for data */
8636                                         *reason_code = 2;
8637                                         break;
8638                                 }
8639                                 if ((chk->whoTo != NULL) &&
8640                                     (chk->whoTo != net)) {
8641                                         /* Don't send the chunk on this net */
8642                                         continue;
8643                                 }
8644
8645                                 if (asoc->sctp_cmt_on_off == 0) {
8646                                         if ((asoc->alternate) &&
8647                                             (asoc->alternate != net) &&
8648                                             (chk->whoTo == NULL)) {
8649                                                 continue;
8650                                         } else if ((net != asoc->primary_destination) &&
8651                                                     (asoc->alternate == NULL) &&
8652                                             (chk->whoTo == NULL)) {
8653                                                 continue;
8654                                         }
8655                                 }
8656                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8657                                         /*-
8658                                          * strange, we have a chunk that is
8659                                          * to big for its destination and
8660                                          * yet no fragment ok flag.
8661                                          * Something went wrong when the
8662                                          * PMTU changed...we did not mark
8663                                          * this chunk for some reason?? I
8664                                          * will fix it here by letting IP
8665                                          * fragment it for now and printing
8666                                          * a warning. This really should not
8667                                          * happen ...
8668                                          */
8669                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8670                                             chk->send_size, mtu);
8671                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8672                                 }
8673                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8674                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8675                                         struct sctp_data_chunk *dchkh;
8676
8677                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8678                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8679                                 }
8680                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8681                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8682                                         /* ok we will add this one */
8683
8684                                         /*
8685                                          * Add an AUTH chunk, if chunk
8686                                          * requires it, save the offset into
8687                                          * the chain for AUTH
8688                                          */
8689                                         if (data_auth_reqd) {
8690                                                 if (auth == NULL) {
8691                                                         outchain = sctp_add_auth_chunk(outchain,
8692                                                             &endoutchain,
8693                                                             &auth,
8694                                                             &auth_offset,
8695                                                             stcb,
8696                                                             SCTP_DATA);
8697                                                         auth_keyid = chk->auth_keyid;
8698                                                         override_ok = 0;
8699                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8700                                                 } else if (override_ok) {
8701                                                         /*
8702                                                          * use this data's
8703                                                          * keyid
8704                                                          */
8705                                                         auth_keyid = chk->auth_keyid;
8706                                                         override_ok = 0;
8707                                                 } else if (auth_keyid != chk->auth_keyid) {
8708                                                         /*
8709                                                          * different keyid,
8710                                                          * so done bundling
8711                                                          */
8712                                                         break;
8713                                                 }
8714                                         }
8715                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8716                                             chk->send_size, chk->copy_by_ref);
8717                                         if (outchain == NULL) {
8718                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8719                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8720                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8721                                                 }
8722                                                 *reason_code = 3;
8723                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8724                                                 return (ENOMEM);
8725                                         }
8726                                         /* upate our MTU size */
8727                                         /* Do clear IP_DF ? */
8728                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8729                                                 no_fragmentflg = 0;
8730                                         }
8731                                         /* unsigned subtraction of mtu */
8732                                         if (mtu > chk->send_size)
8733                                                 mtu -= chk->send_size;
8734                                         else
8735                                                 mtu = 0;
8736                                         /* unsigned subtraction of r_mtu */
8737                                         if (r_mtu > chk->send_size)
8738                                                 r_mtu -= chk->send_size;
8739                                         else
8740                                                 r_mtu = 0;
8741
8742                                         to_out += chk->send_size;
8743                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8744 #ifdef INVARIANTS
8745                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8746 #else
8747                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8748                                                     mx_mtu, to_out);
8749 #endif
8750                                         }
8751                                         chk->window_probe = 0;
8752                                         data_list[bundle_at++] = chk;
8753                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8754                                                 break;
8755                                         }
8756                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8757                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8758                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8759                                                 } else {
8760                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8761                                                 }
8762                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8763                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8764                                                         /*
8765                                                          * Count number of
8766                                                          * user msg's that
8767                                                          * were fragmented
8768                                                          * we do this by
8769                                                          * counting when we
8770                                                          * see a LAST
8771                                                          * fragment only.
8772                                                          */
8773                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8774                                         }
8775                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8776                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8777                                                         data_list[0]->window_probe = 1;
8778                                                         net->window_probe = 1;
8779                                                 }
8780                                                 break;
8781                                         }
8782                                 } else {
8783                                         /*
8784                                          * Must be sent in order of the
8785                                          * TSN's (on a network)
8786                                          */
8787                                         break;
8788                                 }
8789                         }       /* for (chunk gather loop for this net) */
8790                 }               /* if asoc.state OPEN */
8791 no_data_fill:
8792                 /* Is there something to send for this destination? */
8793                 if (outchain) {
8794                         /* We may need to start a control timer or two */
8795                         if (asconf) {
8796                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8797                                     stcb, net);
8798                                 /*
8799                                  * do NOT clear the asconf flag as it is
8800                                  * used to do appropriate source address
8801                                  * selection.
8802                                  */
8803                         }
8804                         if (cookie) {
8805                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8806                                 cookie = 0;
8807                         }
8808                         /* must start a send timer if data is being sent */
8809                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8810                                 /*
8811                                  * no timer running on this destination
8812                                  * restart it.
8813                                  */
8814                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8815                         }
8816                         if (bundle_at || hbflag) {
8817                                 /* For data/asconf and hb set time */
8818                                 if (*now_filled == 0) {
8819                                         (void)SCTP_GETTIME_TIMEVAL(now);
8820                                         *now_filled = 1;
8821                                 }
8822                                 net->last_sent_time = *now;
8823                         }
8824                         /* Now send it, if there is anything to send :> */
8825                         if ((error = sctp_lowlevel_chunk_output(inp,
8826                             stcb,
8827                             net,
8828                             (struct sockaddr *)&net->ro._l_addr,
8829                             outchain,
8830                             auth_offset,
8831                             auth,
8832                             auth_keyid,
8833                             no_fragmentflg,
8834                             bundle_at,
8835                             asconf,
8836                             inp->sctp_lport, stcb->rport,
8837                             htonl(stcb->asoc.peer_vtag),
8838                             net->port, NULL,
8839                             0, 0,
8840                             so_locked))) {
8841                                 /* error, we could not output */
8842                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8843                                 if (from_where == 0) {
8844                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8845                                 }
8846                                 if (error == ENOBUFS) {
8847                                         asoc->ifp_had_enobuf = 1;
8848                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8849                                 }
8850                                 if (error == EHOSTUNREACH) {
8851                                         /*
8852                                          * Destination went unreachable
8853                                          * during this send
8854                                          */
8855                                         sctp_move_chunks_from_net(stcb, net);
8856                                 }
8857                                 *reason_code = 6;
8858                                 /*-
8859                                  * I add this line to be paranoid. As far as
8860                                  * I can tell the continue, takes us back to
8861                                  * the top of the for, but just to make sure
8862                                  * I will reset these again here.
8863                                  */
8864                                 ctl_cnt = bundle_at = 0;
8865                                 continue;       /* This takes us back to the
8866                                                  * for() for the nets. */
8867                         } else {
8868                                 asoc->ifp_had_enobuf = 0;
8869                         }
8870                         endoutchain = NULL;
8871                         auth = NULL;
8872                         auth_offset = 0;
8873                         if (!no_out_cnt) {
8874                                 *num_out += (ctl_cnt + bundle_at);
8875                         }
8876                         if (bundle_at) {
8877                                 /* setup for a RTO measurement */
8878                                 tsns_sent = data_list[0]->rec.data.tsn;
8879                                 /* fill time if not already filled */
8880                                 if (*now_filled == 0) {
8881                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8882                                         *now_filled = 1;
8883                                         *now = asoc->time_last_sent;
8884                                 } else {
8885                                         asoc->time_last_sent = *now;
8886                                 }
8887                                 if (net->rto_needed) {
8888                                         data_list[0]->do_rtt = 1;
8889                                         net->rto_needed = 0;
8890                                 }
8891                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8892                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8893                         }
8894                         if (one_chunk) {
8895                                 break;
8896                         }
8897                 }
8898                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8899                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8900                 }
8901         }
8902         if (old_start_at == NULL) {
8903                 old_start_at = start_at;
8904                 start_at = TAILQ_FIRST(&asoc->nets);
8905                 if (old_start_at)
8906                         goto again_one_more_time;
8907         }
8908
8909         /*
8910          * At the end there should be no NON timed chunks hanging on this
8911          * queue.
8912          */
8913         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8914                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8915         }
8916         if ((*num_out == 0) && (*reason_code == 0)) {
8917                 *reason_code = 4;
8918         } else {
8919                 *reason_code = 5;
8920         }
8921         sctp_clean_up_ctl(stcb, asoc, so_locked);
8922         return (0);
8923 }
8924
8925 void
8926 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8927 {
8928         /*-
8929          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8930          * the control chunk queue.
8931          */
8932         struct sctp_chunkhdr *hdr;
8933         struct sctp_tmit_chunk *chk;
8934         struct mbuf *mat, *last_mbuf;
8935         uint32_t chunk_length;
8936         uint16_t padding_length;
8937
8938         SCTP_TCB_LOCK_ASSERT(stcb);
8939         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8940         if (op_err == NULL) {
8941                 return;
8942         }
8943         last_mbuf = NULL;
8944         chunk_length = 0;
8945         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8946                 chunk_length += SCTP_BUF_LEN(mat);
8947                 if (SCTP_BUF_NEXT(mat) == NULL) {
8948                         last_mbuf = mat;
8949                 }
8950         }
8951         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8952                 sctp_m_freem(op_err);
8953                 return;
8954         }
8955         padding_length = chunk_length % 4;
8956         if (padding_length != 0) {
8957                 padding_length = 4 - padding_length;
8958         }
8959         if (padding_length != 0) {
8960                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8961                         sctp_m_freem(op_err);
8962                         return;
8963                 }
8964         }
8965         sctp_alloc_a_chunk(stcb, chk);
8966         if (chk == NULL) {
8967                 /* no memory */
8968                 sctp_m_freem(op_err);
8969                 return;
8970         }
8971         chk->copy_by_ref = 0;
8972         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8973         chk->rec.chunk_id.can_take_data = 0;
8974         chk->flags = 0;
8975         chk->send_size = (uint16_t)chunk_length;
8976         chk->sent = SCTP_DATAGRAM_UNSENT;
8977         chk->snd_count = 0;
8978         chk->asoc = &stcb->asoc;
8979         chk->data = op_err;
8980         chk->whoTo = NULL;
8981         hdr = mtod(op_err, struct sctp_chunkhdr *);
8982         hdr->chunk_type = SCTP_OPERATION_ERROR;
8983         hdr->chunk_flags = 0;
8984         hdr->chunk_length = htons(chk->send_size);
8985         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8986         chk->asoc->ctrl_queue_cnt++;
8987 }
8988
8989 int
8990 sctp_send_cookie_echo(struct mbuf *m,
8991     int offset,
8992     struct sctp_tcb *stcb,
8993     struct sctp_nets *net)
8994 {
8995         /*-
8996          * pull out the cookie and put it at the front of the control chunk
8997          * queue.
8998          */
8999         int at;
9000         struct mbuf *cookie;
9001         struct sctp_paramhdr param, *phdr;
9002         struct sctp_chunkhdr *hdr;
9003         struct sctp_tmit_chunk *chk;
9004         uint16_t ptype, plen;
9005
9006         SCTP_TCB_LOCK_ASSERT(stcb);
9007         /* First find the cookie in the param area */
9008         cookie = NULL;
9009         at = offset + sizeof(struct sctp_init_chunk);
9010         for (;;) {
9011                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9012                 if (phdr == NULL) {
9013                         return (-3);
9014                 }
9015                 ptype = ntohs(phdr->param_type);
9016                 plen = ntohs(phdr->param_length);
9017                 if (ptype == SCTP_STATE_COOKIE) {
9018                         int pad;
9019
9020                         /* found the cookie */
9021                         if ((pad = (plen % 4))) {
9022                                 plen += 4 - pad;
9023                         }
9024                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9025                         if (cookie == NULL) {
9026                                 /* No memory */
9027                                 return (-2);
9028                         }
9029 #ifdef SCTP_MBUF_LOGGING
9030                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9031                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9032                         }
9033 #endif
9034                         break;
9035                 }
9036                 at += SCTP_SIZE32(plen);
9037         }
9038         /* ok, we got the cookie lets change it into a cookie echo chunk */
9039         /* first the change from param to cookie */
9040         hdr = mtod(cookie, struct sctp_chunkhdr *);
9041         hdr->chunk_type = SCTP_COOKIE_ECHO;
9042         hdr->chunk_flags = 0;
9043         /* get the chunk stuff now and place it in the FRONT of the queue */
9044         sctp_alloc_a_chunk(stcb, chk);
9045         if (chk == NULL) {
9046                 /* no memory */
9047                 sctp_m_freem(cookie);
9048                 return (-5);
9049         }
9050         chk->copy_by_ref = 0;
9051         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9052         chk->rec.chunk_id.can_take_data = 0;
9053         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9054         chk->send_size = plen;
9055         chk->sent = SCTP_DATAGRAM_UNSENT;
9056         chk->snd_count = 0;
9057         chk->asoc = &stcb->asoc;
9058         chk->data = cookie;
9059         chk->whoTo = net;
9060         atomic_add_int(&chk->whoTo->ref_count, 1);
9061         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9062         chk->asoc->ctrl_queue_cnt++;
9063         return (0);
9064 }
9065
9066 void
9067 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9068     struct mbuf *m,
9069     int offset,
9070     int chk_length,
9071     struct sctp_nets *net)
9072 {
9073         /*
9074          * take a HB request and make it into a HB ack and send it.
9075          */
9076         struct mbuf *outchain;
9077         struct sctp_chunkhdr *chdr;
9078         struct sctp_tmit_chunk *chk;
9079
9080
9081         if (net == NULL)
9082                 /* must have a net pointer */
9083                 return;
9084
9085         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9086         if (outchain == NULL) {
9087                 /* gak out of memory */
9088                 return;
9089         }
9090 #ifdef SCTP_MBUF_LOGGING
9091         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9092                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9093         }
9094 #endif
9095         chdr = mtod(outchain, struct sctp_chunkhdr *);
9096         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9097         chdr->chunk_flags = 0;
9098         if (chk_length % 4) {
9099                 /* need pad */
9100                 uint32_t cpthis = 0;
9101                 int padlen;
9102
9103                 padlen = 4 - (chk_length % 4);
9104                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9105         }
9106         sctp_alloc_a_chunk(stcb, chk);
9107         if (chk == NULL) {
9108                 /* no memory */
9109                 sctp_m_freem(outchain);
9110                 return;
9111         }
9112         chk->copy_by_ref = 0;
9113         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9114         chk->rec.chunk_id.can_take_data = 1;
9115         chk->flags = 0;
9116         chk->send_size = chk_length;
9117         chk->sent = SCTP_DATAGRAM_UNSENT;
9118         chk->snd_count = 0;
9119         chk->asoc = &stcb->asoc;
9120         chk->data = outchain;
9121         chk->whoTo = net;
9122         atomic_add_int(&chk->whoTo->ref_count, 1);
9123         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9124         chk->asoc->ctrl_queue_cnt++;
9125 }
9126
9127 void
9128 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9129 {
9130         /* formulate and queue a cookie-ack back to sender */
9131         struct mbuf *cookie_ack;
9132         struct sctp_chunkhdr *hdr;
9133         struct sctp_tmit_chunk *chk;
9134
9135         SCTP_TCB_LOCK_ASSERT(stcb);
9136
9137         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9138         if (cookie_ack == NULL) {
9139                 /* no mbuf's */
9140                 return;
9141         }
9142         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9143         sctp_alloc_a_chunk(stcb, chk);
9144         if (chk == NULL) {
9145                 /* no memory */
9146                 sctp_m_freem(cookie_ack);
9147                 return;
9148         }
9149         chk->copy_by_ref = 0;
9150         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9151         chk->rec.chunk_id.can_take_data = 1;
9152         chk->flags = 0;
9153         chk->send_size = sizeof(struct sctp_chunkhdr);
9154         chk->sent = SCTP_DATAGRAM_UNSENT;
9155         chk->snd_count = 0;
9156         chk->asoc = &stcb->asoc;
9157         chk->data = cookie_ack;
9158         if (chk->asoc->last_control_chunk_from != NULL) {
9159                 chk->whoTo = chk->asoc->last_control_chunk_from;
9160                 atomic_add_int(&chk->whoTo->ref_count, 1);
9161         } else {
9162                 chk->whoTo = NULL;
9163         }
9164         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9165         hdr->chunk_type = SCTP_COOKIE_ACK;
9166         hdr->chunk_flags = 0;
9167         hdr->chunk_length = htons(chk->send_size);
9168         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9169         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9170         chk->asoc->ctrl_queue_cnt++;
9171         return;
9172 }
9173
9174
9175 void
9176 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9177 {
9178         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9179         struct mbuf *m_shutdown_ack;
9180         struct sctp_shutdown_ack_chunk *ack_cp;
9181         struct sctp_tmit_chunk *chk;
9182
9183         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9184         if (m_shutdown_ack == NULL) {
9185                 /* no mbuf's */
9186                 return;
9187         }
9188         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9189         sctp_alloc_a_chunk(stcb, chk);
9190         if (chk == NULL) {
9191                 /* no memory */
9192                 sctp_m_freem(m_shutdown_ack);
9193                 return;
9194         }
9195         chk->copy_by_ref = 0;
9196         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9197         chk->rec.chunk_id.can_take_data = 1;
9198         chk->flags = 0;
9199         chk->send_size = sizeof(struct sctp_chunkhdr);
9200         chk->sent = SCTP_DATAGRAM_UNSENT;
9201         chk->snd_count = 0;
9202         chk->asoc = &stcb->asoc;
9203         chk->data = m_shutdown_ack;
9204         chk->whoTo = net;
9205         if (chk->whoTo) {
9206                 atomic_add_int(&chk->whoTo->ref_count, 1);
9207         }
9208         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9209         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9210         ack_cp->ch.chunk_flags = 0;
9211         ack_cp->ch.chunk_length = htons(chk->send_size);
9212         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9213         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9214         chk->asoc->ctrl_queue_cnt++;
9215         return;
9216 }
9217
9218 void
9219 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9220 {
9221         /* formulate and queue a SHUTDOWN to the sender */
9222         struct mbuf *m_shutdown;
9223         struct sctp_shutdown_chunk *shutdown_cp;
9224         struct sctp_tmit_chunk *chk;
9225
9226         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9227                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9228                         /* We already have a SHUTDOWN queued. Reuse it. */
9229                         if (chk->whoTo) {
9230                                 sctp_free_remote_addr(chk->whoTo);
9231                                 chk->whoTo = NULL;
9232                         }
9233                         break;
9234                 }
9235         }
9236         if (chk == NULL) {
9237                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9238                 if (m_shutdown == NULL) {
9239                         /* no mbuf's */
9240                         return;
9241                 }
9242                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9243                 sctp_alloc_a_chunk(stcb, chk);
9244                 if (chk == NULL) {
9245                         /* no memory */
9246                         sctp_m_freem(m_shutdown);
9247                         return;
9248                 }
9249                 chk->copy_by_ref = 0;
9250                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9251                 chk->rec.chunk_id.can_take_data = 1;
9252                 chk->flags = 0;
9253                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9254                 chk->sent = SCTP_DATAGRAM_UNSENT;
9255                 chk->snd_count = 0;
9256                 chk->asoc = &stcb->asoc;
9257                 chk->data = m_shutdown;
9258                 chk->whoTo = net;
9259                 if (chk->whoTo) {
9260                         atomic_add_int(&chk->whoTo->ref_count, 1);
9261                 }
9262                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9263                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9264                 shutdown_cp->ch.chunk_flags = 0;
9265                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9266                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9267                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9268                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9269                 chk->asoc->ctrl_queue_cnt++;
9270         } else {
9271                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9272                 chk->whoTo = net;
9273                 if (chk->whoTo) {
9274                         atomic_add_int(&chk->whoTo->ref_count, 1);
9275                 }
9276                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9277                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9278                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9279         }
9280         return;
9281 }
9282
9283 void
9284 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9285 {
9286         /*
9287          * formulate and queue an ASCONF to the peer. ASCONF parameters
9288          * should be queued on the assoc queue.
9289          */
9290         struct sctp_tmit_chunk *chk;
9291         struct mbuf *m_asconf;
9292         int len;
9293
9294         SCTP_TCB_LOCK_ASSERT(stcb);
9295
9296         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9297             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9298                 /* can't send a new one if there is one in flight already */
9299                 return;
9300         }
9301
9302         /* compose an ASCONF chunk, maximum length is PMTU */
9303         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9304         if (m_asconf == NULL) {
9305                 return;
9306         }
9307
9308         sctp_alloc_a_chunk(stcb, chk);
9309         if (chk == NULL) {
9310                 /* no memory */
9311                 sctp_m_freem(m_asconf);
9312                 return;
9313         }
9314
9315         chk->copy_by_ref = 0;
9316         chk->rec.chunk_id.id = SCTP_ASCONF;
9317         chk->rec.chunk_id.can_take_data = 0;
9318         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9319         chk->data = m_asconf;
9320         chk->send_size = len;
9321         chk->sent = SCTP_DATAGRAM_UNSENT;
9322         chk->snd_count = 0;
9323         chk->asoc = &stcb->asoc;
9324         chk->whoTo = net;
9325         if (chk->whoTo) {
9326                 atomic_add_int(&chk->whoTo->ref_count, 1);
9327         }
9328         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9329         chk->asoc->ctrl_queue_cnt++;
9330         return;
9331 }
9332
9333 void
9334 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9335 {
9336         /*
9337          * formulate and queue a asconf-ack back to sender. the asconf-ack
9338          * must be stored in the tcb.
9339          */
9340         struct sctp_tmit_chunk *chk;
9341         struct sctp_asconf_ack *ack, *latest_ack;
9342         struct mbuf *m_ack;
9343         struct sctp_nets *net = NULL;
9344
9345         SCTP_TCB_LOCK_ASSERT(stcb);
9346         /* Get the latest ASCONF-ACK */
9347         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9348         if (latest_ack == NULL) {
9349                 return;
9350         }
9351         if (latest_ack->last_sent_to != NULL &&
9352             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9353                 /* we're doing a retransmission */
9354                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9355                 if (net == NULL) {
9356                         /* no alternate */
9357                         if (stcb->asoc.last_control_chunk_from == NULL) {
9358                                 if (stcb->asoc.alternate) {
9359                                         net = stcb->asoc.alternate;
9360                                 } else {
9361                                         net = stcb->asoc.primary_destination;
9362                                 }
9363                         } else {
9364                                 net = stcb->asoc.last_control_chunk_from;
9365                         }
9366                 }
9367         } else {
9368                 /* normal case */
9369                 if (stcb->asoc.last_control_chunk_from == NULL) {
9370                         if (stcb->asoc.alternate) {
9371                                 net = stcb->asoc.alternate;
9372                         } else {
9373                                 net = stcb->asoc.primary_destination;
9374                         }
9375                 } else {
9376                         net = stcb->asoc.last_control_chunk_from;
9377                 }
9378         }
9379         latest_ack->last_sent_to = net;
9380
9381         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9382                 if (ack->data == NULL) {
9383                         continue;
9384                 }
9385
9386                 /* copy the asconf_ack */
9387                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9388                 if (m_ack == NULL) {
9389                         /* couldn't copy it */
9390                         return;
9391                 }
9392 #ifdef SCTP_MBUF_LOGGING
9393                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9394                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9395                 }
9396 #endif
9397
9398                 sctp_alloc_a_chunk(stcb, chk);
9399                 if (chk == NULL) {
9400                         /* no memory */
9401                         if (m_ack)
9402                                 sctp_m_freem(m_ack);
9403                         return;
9404                 }
9405                 chk->copy_by_ref = 0;
9406                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9407                 chk->rec.chunk_id.can_take_data = 1;
9408                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9409                 chk->whoTo = net;
9410                 if (chk->whoTo) {
9411                         atomic_add_int(&chk->whoTo->ref_count, 1);
9412                 }
9413                 chk->data = m_ack;
9414                 chk->send_size = ack->len;
9415                 chk->sent = SCTP_DATAGRAM_UNSENT;
9416                 chk->snd_count = 0;
9417                 chk->asoc = &stcb->asoc;
9418
9419                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9420                 chk->asoc->ctrl_queue_cnt++;
9421         }
9422         return;
9423 }
9424
9425
9426 static int
9427 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9428     struct sctp_tcb *stcb,
9429     struct sctp_association *asoc,
9430     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9431 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9432     SCTP_UNUSED
9433 #endif
9434 )
9435 {
9436         /*-
9437          * send out one MTU of retransmission. If fast_retransmit is
9438          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9439          * rwnd. For a Cookie or Asconf in the control chunk queue we
9440          * retransmit them by themselves.
9441          *
9442          * For data chunks we will pick out the lowest TSN's in the sent_queue
9443          * marked for resend and bundle them all together (up to a MTU of
9444          * destination). The address to send to should have been
9445          * selected/changed where the retransmission was marked (i.e. in FR
9446          * or t3-timeout routines).
9447          */
9448         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9449         struct sctp_tmit_chunk *chk, *fwd;
9450         struct mbuf *m, *endofchain;
9451         struct sctp_nets *net = NULL;
9452         uint32_t tsns_sent = 0;
9453         int no_fragmentflg, bundle_at, cnt_thru;
9454         unsigned int mtu;
9455         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9456         struct sctp_auth_chunk *auth = NULL;
9457         uint32_t auth_offset = 0;
9458         uint16_t auth_keyid;
9459         int override_ok = 1;
9460         int data_auth_reqd = 0;
9461         uint32_t dmtu = 0;
9462
9463         SCTP_TCB_LOCK_ASSERT(stcb);
9464         tmr_started = ctl_cnt = bundle_at = error = 0;
9465         no_fragmentflg = 1;
9466         fwd_tsn = 0;
9467         *cnt_out = 0;
9468         fwd = NULL;
9469         endofchain = m = NULL;
9470         auth_keyid = stcb->asoc.authinfo.active_keyid;
9471 #ifdef SCTP_AUDITING_ENABLED
9472         sctp_audit_log(0xC3, 1);
9473 #endif
9474         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9475             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9476                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9477                     asoc->sent_queue_retran_cnt);
9478                 asoc->sent_queue_cnt = 0;
9479                 asoc->sent_queue_cnt_removeable = 0;
9480                 /* send back 0/0 so we enter normal transmission */
9481                 *cnt_out = 0;
9482                 return (0);
9483         }
9484         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9485                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9486                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9487                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9488                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9489                                 continue;
9490                         }
9491                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9492                                 if (chk != asoc->str_reset) {
9493                                         /*
9494                                          * not eligible for retran if its
9495                                          * not ours
9496                                          */
9497                                         continue;
9498                                 }
9499                         }
9500                         ctl_cnt++;
9501                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9502                                 fwd_tsn = 1;
9503                         }
9504                         /*
9505                          * Add an AUTH chunk, if chunk requires it save the
9506                          * offset into the chain for AUTH
9507                          */
9508                         if ((auth == NULL) &&
9509                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9510                             stcb->asoc.peer_auth_chunks))) {
9511                                 m = sctp_add_auth_chunk(m, &endofchain,
9512                                     &auth, &auth_offset,
9513                                     stcb,
9514                                     chk->rec.chunk_id.id);
9515                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9516                         }
9517                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9518                         break;
9519                 }
9520         }
9521         one_chunk = 0;
9522         cnt_thru = 0;
9523         /* do we have control chunks to retransmit? */
9524         if (m != NULL) {
9525                 /* Start a timer no matter if we succeed or fail */
9526                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9527                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9528                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9529                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9530                 chk->snd_count++;       /* update our count */
9531                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9532                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9533                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9534                     no_fragmentflg, 0, 0,
9535                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9536                     chk->whoTo->port, NULL,
9537                     0, 0,
9538                     so_locked))) {
9539                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9540                         if (error == ENOBUFS) {
9541                                 asoc->ifp_had_enobuf = 1;
9542                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9543                         }
9544                         return (error);
9545                 } else {
9546                         asoc->ifp_had_enobuf = 0;
9547                 }
9548                 endofchain = NULL;
9549                 auth = NULL;
9550                 auth_offset = 0;
9551                 /*
9552                  * We don't want to mark the net->sent time here since this
9553                  * we use this for HB and retrans cannot measure RTT
9554                  */
9555                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9556                 *cnt_out += 1;
9557                 chk->sent = SCTP_DATAGRAM_SENT;
9558                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9559                 if (fwd_tsn == 0) {
9560                         return (0);
9561                 } else {
9562                         /* Clean up the fwd-tsn list */
9563                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9564                         return (0);
9565                 }
9566         }
9567         /*
9568          * Ok, it is just data retransmission we need to do or that and a
9569          * fwd-tsn with it all.
9570          */
9571         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9572                 return (SCTP_RETRAN_DONE);
9573         }
9574         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9575             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9576                 /* not yet open, resend the cookie and that is it */
9577                 return (1);
9578         }
9579 #ifdef SCTP_AUDITING_ENABLED
9580         sctp_auditing(20, inp, stcb, NULL);
9581 #endif
9582         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9583         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9584                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9585                         /* No, not sent to this net or not ready for rtx */
9586                         continue;
9587                 }
9588                 if (chk->data == NULL) {
9589                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9590                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9591                         continue;
9592                 }
9593                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9594                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9595                         struct mbuf *op_err;
9596                         char msg[SCTP_DIAG_INFO_LEN];
9597
9598                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9599                             chk->rec.data.tsn, chk->snd_count);
9600                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9601                             msg);
9602                         atomic_add_int(&stcb->asoc.refcnt, 1);
9603                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9604                             so_locked);
9605                         SCTP_TCB_LOCK(stcb);
9606                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9607                         return (SCTP_RETRAN_EXIT);
9608                 }
9609                 /* pick up the net */
9610                 net = chk->whoTo;
9611                 switch (net->ro._l_addr.sa.sa_family) {
9612 #ifdef INET
9613                 case AF_INET:
9614                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9615                         break;
9616 #endif
9617 #ifdef INET6
9618                 case AF_INET6:
9619                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9620                         break;
9621 #endif
9622                 default:
9623                         /* TSNH */
9624                         mtu = net->mtu;
9625                         break;
9626                 }
9627
9628                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9629                         /* No room in peers rwnd */
9630                         uint32_t tsn;
9631
9632                         tsn = asoc->last_acked_seq + 1;
9633                         if (tsn == chk->rec.data.tsn) {
9634                                 /*
9635                                  * we make a special exception for this
9636                                  * case. The peer has no rwnd but is missing
9637                                  * the lowest chunk.. which is probably what
9638                                  * is holding up the rwnd.
9639                                  */
9640                                 goto one_chunk_around;
9641                         }
9642                         return (1);
9643                 }
9644 one_chunk_around:
9645                 if (asoc->peers_rwnd < mtu) {
9646                         one_chunk = 1;
9647                         if ((asoc->peers_rwnd == 0) &&
9648                             (asoc->total_flight == 0)) {
9649                                 chk->window_probe = 1;
9650                                 chk->whoTo->window_probe = 1;
9651                         }
9652                 }
9653 #ifdef SCTP_AUDITING_ENABLED
9654                 sctp_audit_log(0xC3, 2);
9655 #endif
9656                 bundle_at = 0;
9657                 m = NULL;
9658                 net->fast_retran_ip = 0;
9659                 if (chk->rec.data.doing_fast_retransmit == 0) {
9660                         /*
9661                          * if no FR in progress skip destination that have
9662                          * flight_size > cwnd.
9663                          */
9664                         if (net->flight_size >= net->cwnd) {
9665                                 continue;
9666                         }
9667                 } else {
9668                         /*
9669                          * Mark the destination net to have FR recovery
9670                          * limits put on it.
9671                          */
9672                         *fr_done = 1;
9673                         net->fast_retran_ip = 1;
9674                 }
9675
9676                 /*
9677                  * if no AUTH is yet included and this chunk requires it,
9678                  * make sure to account for it.  We don't apply the size
9679                  * until the AUTH chunk is actually added below in case
9680                  * there is no room for this chunk.
9681                  */
9682                 if (data_auth_reqd && (auth == NULL)) {
9683                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9684                 } else
9685                         dmtu = 0;
9686
9687                 if ((chk->send_size <= (mtu - dmtu)) ||
9688                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9689                         /* ok we will add this one */
9690                         if (data_auth_reqd) {
9691                                 if (auth == NULL) {
9692                                         m = sctp_add_auth_chunk(m,
9693                                             &endofchain,
9694                                             &auth,
9695                                             &auth_offset,
9696                                             stcb,
9697                                             SCTP_DATA);
9698                                         auth_keyid = chk->auth_keyid;
9699                                         override_ok = 0;
9700                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9701                                 } else if (override_ok) {
9702                                         auth_keyid = chk->auth_keyid;
9703                                         override_ok = 0;
9704                                 } else if (chk->auth_keyid != auth_keyid) {
9705                                         /* different keyid, so done bundling */
9706                                         break;
9707                                 }
9708                         }
9709                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9710                         if (m == NULL) {
9711                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9712                                 return (ENOMEM);
9713                         }
9714                         /* Do clear IP_DF ? */
9715                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9716                                 no_fragmentflg = 0;
9717                         }
9718                         /* upate our MTU size */
9719                         if (mtu > (chk->send_size + dmtu))
9720                                 mtu -= (chk->send_size + dmtu);
9721                         else
9722                                 mtu = 0;
9723                         data_list[bundle_at++] = chk;
9724                         if (one_chunk && (asoc->total_flight <= 0)) {
9725                                 SCTP_STAT_INCR(sctps_windowprobed);
9726                         }
9727                 }
9728                 if (one_chunk == 0) {
9729                         /*
9730                          * now are there anymore forward from chk to pick
9731                          * up?
9732                          */
9733                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9734                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9735                                         /* Nope, not for retran */
9736                                         continue;
9737                                 }
9738                                 if (fwd->whoTo != net) {
9739                                         /* Nope, not the net in question */
9740                                         continue;
9741                                 }
9742                                 if (data_auth_reqd && (auth == NULL)) {
9743                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9744                                 } else
9745                                         dmtu = 0;
9746                                 if (fwd->send_size <= (mtu - dmtu)) {
9747                                         if (data_auth_reqd) {
9748                                                 if (auth == NULL) {
9749                                                         m = sctp_add_auth_chunk(m,
9750                                                             &endofchain,
9751                                                             &auth,
9752                                                             &auth_offset,
9753                                                             stcb,
9754                                                             SCTP_DATA);
9755                                                         auth_keyid = fwd->auth_keyid;
9756                                                         override_ok = 0;
9757                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9758                                                 } else if (override_ok) {
9759                                                         auth_keyid = fwd->auth_keyid;
9760                                                         override_ok = 0;
9761                                                 } else if (fwd->auth_keyid != auth_keyid) {
9762                                                         /*
9763                                                          * different keyid,
9764                                                          * so done bundling
9765                                                          */
9766                                                         break;
9767                                                 }
9768                                         }
9769                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9770                                         if (m == NULL) {
9771                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9772                                                 return (ENOMEM);
9773                                         }
9774                                         /* Do clear IP_DF ? */
9775                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9776                                                 no_fragmentflg = 0;
9777                                         }
9778                                         /* upate our MTU size */
9779                                         if (mtu > (fwd->send_size + dmtu))
9780                                                 mtu -= (fwd->send_size + dmtu);
9781                                         else
9782                                                 mtu = 0;
9783                                         data_list[bundle_at++] = fwd;
9784                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9785                                                 break;
9786                                         }
9787                                 } else {
9788                                         /* can't fit so we are done */
9789                                         break;
9790                                 }
9791                         }
9792                 }
9793                 /* Is there something to send for this destination? */
9794                 if (m) {
9795                         /*
9796                          * No matter if we fail/or succeed we should start a
9797                          * timer. A failure is like a lost IP packet :-)
9798                          */
9799                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9800                                 /*
9801                                  * no timer running on this destination
9802                                  * restart it.
9803                                  */
9804                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9805                                 tmr_started = 1;
9806                         }
9807                         /* Now lets send it, if there is anything to send :> */
9808                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9809                             (struct sockaddr *)&net->ro._l_addr, m,
9810                             auth_offset, auth, auth_keyid,
9811                             no_fragmentflg, 0, 0,
9812                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9813                             net->port, NULL,
9814                             0, 0,
9815                             so_locked))) {
9816                                 /* error, we could not output */
9817                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9818                                 if (error == ENOBUFS) {
9819                                         asoc->ifp_had_enobuf = 1;
9820                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9821                                 }
9822                                 return (error);
9823                         } else {
9824                                 asoc->ifp_had_enobuf = 0;
9825                         }
9826                         endofchain = NULL;
9827                         auth = NULL;
9828                         auth_offset = 0;
9829                         /* For HB's */
9830                         /*
9831                          * We don't want to mark the net->sent time here
9832                          * since this we use this for HB and retrans cannot
9833                          * measure RTT
9834                          */
9835                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9836
9837                         /* For auto-close */
9838                         cnt_thru++;
9839                         if (*now_filled == 0) {
9840                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9841                                 *now = asoc->time_last_sent;
9842                                 *now_filled = 1;
9843                         } else {
9844                                 asoc->time_last_sent = *now;
9845                         }
9846                         *cnt_out += bundle_at;
9847 #ifdef SCTP_AUDITING_ENABLED
9848                         sctp_audit_log(0xC4, bundle_at);
9849 #endif
9850                         if (bundle_at) {
9851                                 tsns_sent = data_list[0]->rec.data.tsn;
9852                         }
9853                         for (i = 0; i < bundle_at; i++) {
9854                                 SCTP_STAT_INCR(sctps_sendretransdata);
9855                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9856                                 /*
9857                                  * When we have a revoked data, and we
9858                                  * retransmit it, then we clear the revoked
9859                                  * flag since this flag dictates if we
9860                                  * subtracted from the fs
9861                                  */
9862                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9863                                         /* Deflate the cwnd */
9864                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9865                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9866                                 }
9867                                 data_list[i]->snd_count++;
9868                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9869                                 /* record the time */
9870                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9871                                 if (data_list[i]->book_size_scale) {
9872                                         /*
9873                                          * need to double the book size on
9874                                          * this one
9875                                          */
9876                                         data_list[i]->book_size_scale = 0;
9877                                         /*
9878                                          * Since we double the booksize, we
9879                                          * must also double the output queue
9880                                          * size, since this get shrunk when
9881                                          * we free by this amount.
9882                                          */
9883                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9884                                         data_list[i]->book_size *= 2;
9885
9886
9887                                 } else {
9888                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9889                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9890                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9891                                         }
9892                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9893                                             (uint32_t)(data_list[i]->send_size +
9894                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9895                                 }
9896                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9897                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9898                                             data_list[i]->whoTo->flight_size,
9899                                             data_list[i]->book_size,
9900                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9901                                             data_list[i]->rec.data.tsn);
9902                                 }
9903                                 sctp_flight_size_increase(data_list[i]);
9904                                 sctp_total_flight_increase(stcb, data_list[i]);
9905                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9906                                         /* SWS sender side engages */
9907                                         asoc->peers_rwnd = 0;
9908                                 }
9909                                 if ((i == 0) &&
9910                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9911                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9912                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9913                                             (tmr_started == 0)) {
9914                                                 /*-
9915                                                  * ok we just fast-retrans'd
9916                                                  * the lowest TSN, i.e the
9917                                                  * first on the list. In
9918                                                  * this case we want to give
9919                                                  * some more time to get a
9920                                                  * SACK back without a
9921                                                  * t3-expiring.
9922                                                  */
9923                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9924                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9925                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9926                                         }
9927                                 }
9928                         }
9929                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9930                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9931                         }
9932 #ifdef SCTP_AUDITING_ENABLED
9933                         sctp_auditing(21, inp, stcb, NULL);
9934 #endif
9935                 } else {
9936                         /* None will fit */
9937                         return (1);
9938                 }
9939                 if (asoc->sent_queue_retran_cnt <= 0) {
9940                         /* all done we have no more to retran */
9941                         asoc->sent_queue_retran_cnt = 0;
9942                         break;
9943                 }
9944                 if (one_chunk) {
9945                         /* No more room in rwnd */
9946                         return (1);
9947                 }
9948                 /* stop the for loop here. we sent out a packet */
9949                 break;
9950         }
9951         return (0);
9952 }
9953
9954 static void
9955 sctp_timer_validation(struct sctp_inpcb *inp,
9956     struct sctp_tcb *stcb,
9957     struct sctp_association *asoc)
9958 {
9959         struct sctp_nets *net;
9960
9961         /* Validate that a timer is running somewhere */
9962         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9963                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9964                         /* Here is a timer */
9965                         return;
9966                 }
9967         }
9968         SCTP_TCB_LOCK_ASSERT(stcb);
9969         /* Gak, we did not have a timer somewhere */
9970         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9971         if (asoc->alternate) {
9972                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9973         } else {
9974                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9975         }
9976         return;
9977 }
9978
9979 void
9980 sctp_chunk_output(struct sctp_inpcb *inp,
9981     struct sctp_tcb *stcb,
9982     int from_where,
9983     int so_locked
9984 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9985     SCTP_UNUSED
9986 #endif
9987 )
9988 {
9989         /*-
9990          * Ok this is the generic chunk service queue. we must do the
9991          * following:
9992          * - See if there are retransmits pending, if so we must
9993          *   do these first.
9994          * - Service the stream queue that is next, moving any
9995          *   message (note I must get a complete message i.e.
9996          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9997          *   TSN's
9998          * - Check to see if the cwnd/rwnd allows any output, if so we
9999          *   go ahead and fomulate and send the low level chunks. Making sure
10000          *   to combine any control in the control chunk queue also.
10001          */
10002         struct sctp_association *asoc;
10003         struct sctp_nets *net;
10004         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10005         unsigned int burst_cnt = 0;
10006         struct timeval now;
10007         int now_filled = 0;
10008         int nagle_on;
10009         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10010         int un_sent = 0;
10011         int fr_done;
10012         unsigned int tot_frs = 0;
10013
10014         asoc = &stcb->asoc;
10015 do_it_again:
10016         /* The Nagle algorithm is only applied when handling a send call. */
10017         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10018                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10019                         nagle_on = 0;
10020                 } else {
10021                         nagle_on = 1;
10022                 }
10023         } else {
10024                 nagle_on = 0;
10025         }
10026         SCTP_TCB_LOCK_ASSERT(stcb);
10027
10028         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10029
10030         if ((un_sent <= 0) &&
10031             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10032             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10033             (asoc->sent_queue_retran_cnt == 0) &&
10034             (asoc->trigger_reset == 0)) {
10035                 /* Nothing to do unless there is something to be sent left */
10036                 return;
10037         }
10038         /*
10039          * Do we have something to send, data or control AND a sack timer
10040          * running, if so piggy-back the sack.
10041          */
10042         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10043                 sctp_send_sack(stcb, so_locked);
10044                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10045         }
10046         while (asoc->sent_queue_retran_cnt) {
10047                 /*-
10048                  * Ok, it is retransmission time only, we send out only ONE
10049                  * packet with a single call off to the retran code.
10050                  */
10051                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10052                         /*-
10053                          * Special hook for handling cookiess discarded
10054                          * by peer that carried data. Send cookie-ack only
10055                          * and then the next call with get the retran's.
10056                          */
10057                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10058                             from_where,
10059                             &now, &now_filled, frag_point, so_locked);
10060                         return;
10061                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10062                         /* if its not from a HB then do it */
10063                         fr_done = 0;
10064                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10065                         if (fr_done) {
10066                                 tot_frs++;
10067                         }
10068                 } else {
10069                         /*
10070                          * its from any other place, we don't allow retran
10071                          * output (only control)
10072                          */
10073                         ret = 1;
10074                 }
10075                 if (ret > 0) {
10076                         /* Can't send anymore */
10077                         /*-
10078                          * now lets push out control by calling med-level
10079                          * output once. this assures that we WILL send HB's
10080                          * if queued too.
10081                          */
10082                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10083                             from_where,
10084                             &now, &now_filled, frag_point, so_locked);
10085 #ifdef SCTP_AUDITING_ENABLED
10086                         sctp_auditing(8, inp, stcb, NULL);
10087 #endif
10088                         sctp_timer_validation(inp, stcb, asoc);
10089                         return;
10090                 }
10091                 if (ret < 0) {
10092                         /*-
10093                          * The count was off.. retran is not happening so do
10094                          * the normal retransmission.
10095                          */
10096 #ifdef SCTP_AUDITING_ENABLED
10097                         sctp_auditing(9, inp, stcb, NULL);
10098 #endif
10099                         if (ret == SCTP_RETRAN_EXIT) {
10100                                 return;
10101                         }
10102                         break;
10103                 }
10104                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10105                         /* Only one transmission allowed out of a timeout */
10106 #ifdef SCTP_AUDITING_ENABLED
10107                         sctp_auditing(10, inp, stcb, NULL);
10108 #endif
10109                         /* Push out any control */
10110                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10111                             &now, &now_filled, frag_point, so_locked);
10112                         return;
10113                 }
10114                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10115                         /* Hit FR burst limit */
10116                         return;
10117                 }
10118                 if ((num_out == 0) && (ret == 0)) {
10119                         /* No more retrans to send */
10120                         break;
10121                 }
10122         }
10123 #ifdef SCTP_AUDITING_ENABLED
10124         sctp_auditing(12, inp, stcb, NULL);
10125 #endif
10126         /* Check for bad destinations, if they exist move chunks around. */
10127         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10128                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10129                         /*-
10130                          * if possible move things off of this address we
10131                          * still may send below due to the dormant state but
10132                          * we try to find an alternate address to send to
10133                          * and if we have one we move all queued data on the
10134                          * out wheel to this alternate address.
10135                          */
10136                         if (net->ref_count > 1)
10137                                 sctp_move_chunks_from_net(stcb, net);
10138                 } else {
10139                         /*-
10140                          * if ((asoc->sat_network) || (net->addr_is_local))
10141                          * { burst_limit = asoc->max_burst *
10142                          * SCTP_SAT_NETWORK_BURST_INCR; }
10143                          */
10144                         if (asoc->max_burst > 0) {
10145                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10146                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10147                                                 /*
10148                                                  * JRS - Use the congestion
10149                                                  * control given in the
10150                                                  * congestion control module
10151                                                  */
10152                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10153                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10154                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10155                                                 }
10156                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10157                                         }
10158                                         net->fast_retran_ip = 0;
10159                                 } else {
10160                                         if (net->flight_size == 0) {
10161                                                 /*
10162                                                  * Should be decaying the
10163                                                  * cwnd here
10164                                                  */
10165                                                 ;
10166                                         }
10167                                 }
10168                         }
10169                 }
10170
10171         }
10172         burst_cnt = 0;
10173         do {
10174                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10175                     &reason_code, 0, from_where,
10176                     &now, &now_filled, frag_point, so_locked);
10177                 if (error) {
10178                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10179                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10180                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10181                         }
10182                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10183                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10184                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10185                         }
10186                         break;
10187                 }
10188                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10189
10190                 tot_out += num_out;
10191                 burst_cnt++;
10192                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10193                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10194                         if (num_out == 0) {
10195                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10196                         }
10197                 }
10198                 if (nagle_on) {
10199                         /*
10200                          * When the Nagle algorithm is used, look at how
10201                          * much is unsent, then if its smaller than an MTU
10202                          * and we have data in flight we stop, except if we
10203                          * are handling a fragmented user message.
10204                          */
10205                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10206                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10207                             (stcb->asoc.total_flight > 0)) {
10208 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10209                                 break;
10210                         }
10211                 }
10212                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10213                     TAILQ_EMPTY(&asoc->send_queue) &&
10214                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10215                         /* Nothing left to send */
10216                         break;
10217                 }
10218                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10219                         /* Nothing left to send */
10220                         break;
10221                 }
10222         } while (num_out &&
10223             ((asoc->max_burst == 0) ||
10224             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10225             (burst_cnt < asoc->max_burst)));
10226
10227         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10228                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10229                         SCTP_STAT_INCR(sctps_maxburstqueued);
10230                         asoc->burst_limit_applied = 1;
10231                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10232                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10233                         }
10234                 } else {
10235                         asoc->burst_limit_applied = 0;
10236                 }
10237         }
10238         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10239                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10240         }
10241         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10242             tot_out);
10243
10244         /*-
10245          * Now we need to clean up the control chunk chain if a ECNE is on
10246          * it. It must be marked as UNSENT again so next call will continue
10247          * to send it until such time that we get a CWR, to remove it.
10248          */
10249         if (stcb->asoc.ecn_echo_cnt_onq)
10250                 sctp_fix_ecn_echo(asoc);
10251
10252         if (stcb->asoc.trigger_reset) {
10253                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10254                         goto do_it_again;
10255                 }
10256         }
10257         return;
10258 }
10259
10260
10261 int
10262 sctp_output(
10263     struct sctp_inpcb *inp,
10264     struct mbuf *m,
10265     struct sockaddr *addr,
10266     struct mbuf *control,
10267     struct thread *p,
10268     int flags)
10269 {
10270         if (inp == NULL) {
10271                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10272                 return (EINVAL);
10273         }
10274
10275         if (inp->sctp_socket == NULL) {
10276                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10277                 return (EINVAL);
10278         }
10279         return (sctp_sosend(inp->sctp_socket,
10280             addr,
10281             (struct uio *)NULL,
10282             m,
10283             control,
10284             flags, p
10285             ));
10286 }
10287
10288 void
10289 send_forward_tsn(struct sctp_tcb *stcb,
10290     struct sctp_association *asoc)
10291 {
10292         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10293         struct sctp_forward_tsn_chunk *fwdtsn;
10294         struct sctp_strseq *strseq;
10295         struct sctp_strseq_mid *strseq_m;
10296         uint32_t advance_peer_ack_point;
10297         unsigned int cnt_of_space, i, ovh;
10298         unsigned int space_needed;
10299         unsigned int cnt_of_skipped = 0;
10300
10301         SCTP_TCB_LOCK_ASSERT(stcb);
10302         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10303                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10304                         /* mark it to unsent */
10305                         chk->sent = SCTP_DATAGRAM_UNSENT;
10306                         chk->snd_count = 0;
10307                         /* Do we correct its output location? */
10308                         if (chk->whoTo) {
10309                                 sctp_free_remote_addr(chk->whoTo);
10310                                 chk->whoTo = NULL;
10311                         }
10312                         goto sctp_fill_in_rest;
10313                 }
10314         }
10315         /* Ok if we reach here we must build one */
10316         sctp_alloc_a_chunk(stcb, chk);
10317         if (chk == NULL) {
10318                 return;
10319         }
10320         asoc->fwd_tsn_cnt++;
10321         chk->copy_by_ref = 0;
10322         /*
10323          * We don't do the old thing here since this is used not for on-wire
10324          * but to tell if we are sending a fwd-tsn by the stack during
10325          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10326          */
10327         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10328         chk->rec.chunk_id.can_take_data = 0;
10329         chk->flags = 0;
10330         chk->asoc = asoc;
10331         chk->whoTo = NULL;
10332         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10333         if (chk->data == NULL) {
10334                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10335                 return;
10336         }
10337         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10338         chk->sent = SCTP_DATAGRAM_UNSENT;
10339         chk->snd_count = 0;
10340         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10341         asoc->ctrl_queue_cnt++;
10342 sctp_fill_in_rest:
10343         /*-
10344          * Here we go through and fill out the part that deals with
10345          * stream/seq of the ones we skip.
10346          */
10347         SCTP_BUF_LEN(chk->data) = 0;
10348         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10349                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10350                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10351                         /* no more to look at */
10352                         break;
10353                 }
10354                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10355                         /* We don't report these */
10356                         continue;
10357                 }
10358                 cnt_of_skipped++;
10359         }
10360         if (asoc->idata_supported) {
10361                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10362                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10363         } else {
10364                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10365                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10366         }
10367         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10368
10369         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10370                 ovh = SCTP_MIN_OVERHEAD;
10371         } else {
10372                 ovh = SCTP_MIN_V4_OVERHEAD;
10373         }
10374         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10375                 /* trim to a mtu size */
10376                 cnt_of_space = asoc->smallest_mtu - ovh;
10377         }
10378         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10379                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10380                     0xff, 0, cnt_of_skipped,
10381                     asoc->advanced_peer_ack_point);
10382         }
10383         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10384         if (cnt_of_space < space_needed) {
10385                 /*-
10386                  * ok we must trim down the chunk by lowering the
10387                  * advance peer ack point.
10388                  */
10389                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10390                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10391                             0xff, 0xff, cnt_of_space,
10392                             space_needed);
10393                 }
10394                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10395                 if (asoc->idata_supported) {
10396                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10397                 } else {
10398                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10399                 }
10400                 /*-
10401                  * Go through and find the TSN that will be the one
10402                  * we report.
10403                  */
10404                 at = TAILQ_FIRST(&asoc->sent_queue);
10405                 if (at != NULL) {
10406                         for (i = 0; i < cnt_of_skipped; i++) {
10407                                 tp1 = TAILQ_NEXT(at, sctp_next);
10408                                 if (tp1 == NULL) {
10409                                         break;
10410                                 }
10411                                 at = tp1;
10412                         }
10413                 }
10414                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10415                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10416                             0xff, cnt_of_skipped, at->rec.data.tsn,
10417                             asoc->advanced_peer_ack_point);
10418                 }
10419                 last = at;
10420                 /*-
10421                  * last now points to last one I can report, update
10422                  * peer ack point
10423                  */
10424                 if (last) {
10425                         advance_peer_ack_point = last->rec.data.tsn;
10426                 }
10427                 if (asoc->idata_supported) {
10428                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10429                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10430                 } else {
10431                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10432                             cnt_of_skipped * sizeof(struct sctp_strseq);
10433                 }
10434         }
10435         chk->send_size = space_needed;
10436         /* Setup the chunk */
10437         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10438         fwdtsn->ch.chunk_length = htons(chk->send_size);
10439         fwdtsn->ch.chunk_flags = 0;
10440         if (asoc->idata_supported) {
10441                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10442         } else {
10443                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10444         }
10445         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10446         SCTP_BUF_LEN(chk->data) = chk->send_size;
10447         fwdtsn++;
10448         /*-
10449          * Move pointer to after the fwdtsn and transfer to the
10450          * strseq pointer.
10451          */
10452         if (asoc->idata_supported) {
10453                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10454                 strseq = NULL;
10455         } else {
10456                 strseq = (struct sctp_strseq *)fwdtsn;
10457                 strseq_m = NULL;
10458         }
10459         /*-
10460          * Now populate the strseq list. This is done blindly
10461          * without pulling out duplicate stream info. This is
10462          * inefficent but won't harm the process since the peer will
10463          * look at these in sequence and will thus release anything.
10464          * It could mean we exceed the PMTU and chop off some that
10465          * we could have included.. but this is unlikely (aka 1432/4
10466          * would mean 300+ stream seq's would have to be reported in
10467          * one FWD-TSN. With a bit of work we can later FIX this to
10468          * optimize and pull out duplicates.. but it does add more
10469          * overhead. So for now... not!
10470          */
10471         i = 0;
10472         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10473                 if (i >= cnt_of_skipped) {
10474                         break;
10475                 }
10476                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10477                         /* We don't report these */
10478                         continue;
10479                 }
10480                 if (at->rec.data.tsn == advance_peer_ack_point) {
10481                         at->rec.data.fwd_tsn_cnt = 0;
10482                 }
10483                 if (asoc->idata_supported) {
10484                         strseq_m->sid = htons(at->rec.data.sid);
10485                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10486                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10487                         } else {
10488                                 strseq_m->flags = 0;
10489                         }
10490                         strseq_m->mid = htonl(at->rec.data.mid);
10491                         strseq_m++;
10492                 } else {
10493                         strseq->sid = htons(at->rec.data.sid);
10494                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10495                         strseq++;
10496                 }
10497                 i++;
10498         }
10499         return;
10500 }
10501
10502 void
10503 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10504 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10505     SCTP_UNUSED
10506 #endif
10507 )
10508 {
10509         /*-
10510          * Queue up a SACK or NR-SACK in the control queue.
10511          * We must first check to see if a SACK or NR-SACK is
10512          * somehow on the control queue.
10513          * If so, we will take and and remove the old one.
10514          */
10515         struct sctp_association *asoc;
10516         struct sctp_tmit_chunk *chk, *a_chk;
10517         struct sctp_sack_chunk *sack;
10518         struct sctp_nr_sack_chunk *nr_sack;
10519         struct sctp_gap_ack_block *gap_descriptor;
10520         const struct sack_track *selector;
10521         int mergeable = 0;
10522         int offset;
10523         caddr_t limit;
10524         uint32_t *dup;
10525         int limit_reached = 0;
10526         unsigned int i, siz, j;
10527         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10528         int num_dups = 0;
10529         int space_req;
10530         uint32_t highest_tsn;
10531         uint8_t flags;
10532         uint8_t type;
10533         uint8_t tsn_map;
10534
10535         if (stcb->asoc.nrsack_supported == 1) {
10536                 type = SCTP_NR_SELECTIVE_ACK;
10537         } else {
10538                 type = SCTP_SELECTIVE_ACK;
10539         }
10540         a_chk = NULL;
10541         asoc = &stcb->asoc;
10542         SCTP_TCB_LOCK_ASSERT(stcb);
10543         if (asoc->last_data_chunk_from == NULL) {
10544                 /* Hmm we never received anything */
10545                 return;
10546         }
10547         sctp_slide_mapping_arrays(stcb);
10548         sctp_set_rwnd(stcb, asoc);
10549         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10550                 if (chk->rec.chunk_id.id == type) {
10551                         /* Hmm, found a sack already on queue, remove it */
10552                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10553                         asoc->ctrl_queue_cnt--;
10554                         a_chk = chk;
10555                         if (a_chk->data) {
10556                                 sctp_m_freem(a_chk->data);
10557                                 a_chk->data = NULL;
10558                         }
10559                         if (a_chk->whoTo) {
10560                                 sctp_free_remote_addr(a_chk->whoTo);
10561                                 a_chk->whoTo = NULL;
10562                         }
10563                         break;
10564                 }
10565         }
10566         if (a_chk == NULL) {
10567                 sctp_alloc_a_chunk(stcb, a_chk);
10568                 if (a_chk == NULL) {
10569                         /* No memory so we drop the idea, and set a timer */
10570                         if (stcb->asoc.delayed_ack) {
10571                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10572                                     stcb->sctp_ep, stcb, NULL,
10573                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10574                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10575                                     stcb->sctp_ep, stcb, NULL);
10576                         } else {
10577                                 stcb->asoc.send_sack = 1;
10578                         }
10579                         return;
10580                 }
10581                 a_chk->copy_by_ref = 0;
10582                 a_chk->rec.chunk_id.id = type;
10583                 a_chk->rec.chunk_id.can_take_data = 1;
10584         }
10585         /* Clear our pkt counts */
10586         asoc->data_pkts_seen = 0;
10587
10588         a_chk->flags = 0;
10589         a_chk->asoc = asoc;
10590         a_chk->snd_count = 0;
10591         a_chk->send_size = 0;   /* fill in later */
10592         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10593         a_chk->whoTo = NULL;
10594
10595         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10596                 /*-
10597                  * Ok, the destination for the SACK is unreachable, lets see if
10598                  * we can select an alternate to asoc->last_data_chunk_from
10599                  */
10600                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10601                 if (a_chk->whoTo == NULL) {
10602                         /* Nope, no alternate */
10603                         a_chk->whoTo = asoc->last_data_chunk_from;
10604                 }
10605         } else {
10606                 a_chk->whoTo = asoc->last_data_chunk_from;
10607         }
10608         if (a_chk->whoTo) {
10609                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10610         }
10611         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10612                 highest_tsn = asoc->highest_tsn_inside_map;
10613         } else {
10614                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10615         }
10616         if (highest_tsn == asoc->cumulative_tsn) {
10617                 /* no gaps */
10618                 if (type == SCTP_SELECTIVE_ACK) {
10619                         space_req = sizeof(struct sctp_sack_chunk);
10620                 } else {
10621                         space_req = sizeof(struct sctp_nr_sack_chunk);
10622                 }
10623         } else {
10624                 /* gaps get a cluster */
10625                 space_req = MCLBYTES;
10626         }
10627         /* Ok now lets formulate a MBUF with our sack */
10628         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10629         if ((a_chk->data == NULL) ||
10630             (a_chk->whoTo == NULL)) {
10631                 /* rats, no mbuf memory */
10632                 if (a_chk->data) {
10633                         /* was a problem with the destination */
10634                         sctp_m_freem(a_chk->data);
10635                         a_chk->data = NULL;
10636                 }
10637                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10638                 /* sa_ignore NO_NULL_CHK */
10639                 if (stcb->asoc.delayed_ack) {
10640                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10641                             stcb->sctp_ep, stcb, NULL,
10642                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10643                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10644                             stcb->sctp_ep, stcb, NULL);
10645                 } else {
10646                         stcb->asoc.send_sack = 1;
10647                 }
10648                 return;
10649         }
10650         /* ok, lets go through and fill it in */
10651         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10652         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10653         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10654                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10655         }
10656         limit = mtod(a_chk->data, caddr_t);
10657         limit += space;
10658
10659         flags = 0;
10660
10661         if ((asoc->sctp_cmt_on_off > 0) &&
10662             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10663                 /*-
10664                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10665                  * received, then set high bit to 1, else 0. Reset
10666                  * pkts_rcvd.
10667                  */
10668                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10669                 asoc->cmt_dac_pkts_rcvd = 0;
10670         }
10671 #ifdef SCTP_ASOCLOG_OF_TSNS
10672         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10673         stcb->asoc.cumack_log_atsnt++;
10674         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10675                 stcb->asoc.cumack_log_atsnt = 0;
10676         }
10677 #endif
10678         /* reset the readers interpretation */
10679         stcb->freed_by_sorcv_sincelast = 0;
10680
10681         if (type == SCTP_SELECTIVE_ACK) {
10682                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10683                 nr_sack = NULL;
10684                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10685                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10686                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10687                 } else {
10688                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10689                 }
10690         } else {
10691                 sack = NULL;
10692                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10693                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10694                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10695                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10696                 } else {
10697                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10698                 }
10699         }
10700
10701         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10702                 offset = 1;
10703         } else {
10704                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10705         }
10706         if (((type == SCTP_SELECTIVE_ACK) &&
10707             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10708             ((type == SCTP_NR_SELECTIVE_ACK) &&
10709             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10710                 /* we have a gap .. maybe */
10711                 for (i = 0; i < siz; i++) {
10712                         tsn_map = asoc->mapping_array[i];
10713                         if (type == SCTP_SELECTIVE_ACK) {
10714                                 tsn_map |= asoc->nr_mapping_array[i];
10715                         }
10716                         if (i == 0) {
10717                                 /*
10718                                  * Clear all bits corresponding to TSNs
10719                                  * smaller or equal to the cumulative TSN.
10720                                  */
10721                                 tsn_map &= (~0U << (1 - offset));
10722                         }
10723                         selector = &sack_array[tsn_map];
10724                         if (mergeable && selector->right_edge) {
10725                                 /*
10726                                  * Backup, left and right edges were ok to
10727                                  * merge.
10728                                  */
10729                                 num_gap_blocks--;
10730                                 gap_descriptor--;
10731                         }
10732                         if (selector->num_entries == 0)
10733                                 mergeable = 0;
10734                         else {
10735                                 for (j = 0; j < selector->num_entries; j++) {
10736                                         if (mergeable && selector->right_edge) {
10737                                                 /*
10738                                                  * do a merge by NOT setting
10739                                                  * the left side
10740                                                  */
10741                                                 mergeable = 0;
10742                                         } else {
10743                                                 /*
10744                                                  * no merge, set the left
10745                                                  * side
10746                                                  */
10747                                                 mergeable = 0;
10748                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10749                                         }
10750                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10751                                         num_gap_blocks++;
10752                                         gap_descriptor++;
10753                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10754                                                 /* no more room */
10755                                                 limit_reached = 1;
10756                                                 break;
10757                                         }
10758                                 }
10759                                 if (selector->left_edge) {
10760                                         mergeable = 1;
10761                                 }
10762                         }
10763                         if (limit_reached) {
10764                                 /* Reached the limit stop */
10765                                 break;
10766                         }
10767                         offset += 8;
10768                 }
10769         }
10770         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10771             (limit_reached == 0)) {
10772
10773                 mergeable = 0;
10774
10775                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10776                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10777                 } else {
10778                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10779                 }
10780
10781                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10782                         offset = 1;
10783                 } else {
10784                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10785                 }
10786                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10787                         /* we have a gap .. maybe */
10788                         for (i = 0; i < siz; i++) {
10789                                 tsn_map = asoc->nr_mapping_array[i];
10790                                 if (i == 0) {
10791                                         /*
10792                                          * Clear all bits corresponding to
10793                                          * TSNs smaller or equal to the
10794                                          * cumulative TSN.
10795                                          */
10796                                         tsn_map &= (~0U << (1 - offset));
10797                                 }
10798                                 selector = &sack_array[tsn_map];
10799                                 if (mergeable && selector->right_edge) {
10800                                         /*
10801                                          * Backup, left and right edges were
10802                                          * ok to merge.
10803                                          */
10804                                         num_nr_gap_blocks--;
10805                                         gap_descriptor--;
10806                                 }
10807                                 if (selector->num_entries == 0)
10808                                         mergeable = 0;
10809                                 else {
10810                                         for (j = 0; j < selector->num_entries; j++) {
10811                                                 if (mergeable && selector->right_edge) {
10812                                                         /*
10813                                                          * do a merge by NOT
10814                                                          * setting the left
10815                                                          * side
10816                                                          */
10817                                                         mergeable = 0;
10818                                                 } else {
10819                                                         /*
10820                                                          * no merge, set the
10821                                                          * left side
10822                                                          */
10823                                                         mergeable = 0;
10824                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10825                                                 }
10826                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10827                                                 num_nr_gap_blocks++;
10828                                                 gap_descriptor++;
10829                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10830                                                         /* no more room */
10831                                                         limit_reached = 1;
10832                                                         break;
10833                                                 }
10834                                         }
10835                                         if (selector->left_edge) {
10836                                                 mergeable = 1;
10837                                         }
10838                                 }
10839                                 if (limit_reached) {
10840                                         /* Reached the limit stop */
10841                                         break;
10842                                 }
10843                                 offset += 8;
10844                         }
10845                 }
10846         }
10847         /* now we must add any dups we are going to report. */
10848         if ((limit_reached == 0) && (asoc->numduptsns)) {
10849                 dup = (uint32_t *)gap_descriptor;
10850                 for (i = 0; i < asoc->numduptsns; i++) {
10851                         *dup = htonl(asoc->dup_tsns[i]);
10852                         dup++;
10853                         num_dups++;
10854                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10855                                 /* no more room */
10856                                 break;
10857                         }
10858                 }
10859                 asoc->numduptsns = 0;
10860         }
10861         /*
10862          * now that the chunk is prepared queue it to the control chunk
10863          * queue.
10864          */
10865         if (type == SCTP_SELECTIVE_ACK) {
10866                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10867                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10868                     num_dups * sizeof(int32_t));
10869                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10870                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10871                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10872                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10873                 sack->sack.num_dup_tsns = htons(num_dups);
10874                 sack->ch.chunk_type = type;
10875                 sack->ch.chunk_flags = flags;
10876                 sack->ch.chunk_length = htons(a_chk->send_size);
10877         } else {
10878                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10879                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10880                     num_dups * sizeof(int32_t));
10881                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10882                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10883                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10884                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10885                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10886                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10887                 nr_sack->nr_sack.reserved = 0;
10888                 nr_sack->ch.chunk_type = type;
10889                 nr_sack->ch.chunk_flags = flags;
10890                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10891         }
10892         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10893         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10894         asoc->ctrl_queue_cnt++;
10895         asoc->send_sack = 0;
10896         SCTP_STAT_INCR(sctps_sendsacks);
10897         return;
10898 }
10899
10900 void
10901 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10902 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10903     SCTP_UNUSED
10904 #endif
10905 )
10906 {
10907         struct mbuf *m_abort, *m, *m_last;
10908         struct mbuf *m_out, *m_end = NULL;
10909         struct sctp_abort_chunk *abort;
10910         struct sctp_auth_chunk *auth = NULL;
10911         struct sctp_nets *net;
10912         uint32_t vtag;
10913         uint32_t auth_offset = 0;
10914         int error;
10915         uint16_t cause_len, chunk_len, padding_len;
10916
10917         SCTP_TCB_LOCK_ASSERT(stcb);
10918         /*-
10919          * Add an AUTH chunk, if chunk requires it and save the offset into
10920          * the chain for AUTH
10921          */
10922         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10923             stcb->asoc.peer_auth_chunks)) {
10924                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10925                     stcb, SCTP_ABORT_ASSOCIATION);
10926                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10927         } else {
10928                 m_out = NULL;
10929         }
10930         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10931         if (m_abort == NULL) {
10932                 if (m_out) {
10933                         sctp_m_freem(m_out);
10934                 }
10935                 if (operr) {
10936                         sctp_m_freem(operr);
10937                 }
10938                 return;
10939         }
10940         /* link in any error */
10941         SCTP_BUF_NEXT(m_abort) = operr;
10942         cause_len = 0;
10943         m_last = NULL;
10944         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10945                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10946                 if (SCTP_BUF_NEXT(m) == NULL) {
10947                         m_last = m;
10948                 }
10949         }
10950         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10951         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10952         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10953         if (m_out == NULL) {
10954                 /* NO Auth chunk prepended, so reserve space in front */
10955                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10956                 m_out = m_abort;
10957         } else {
10958                 /* Put AUTH chunk at the front of the chain */
10959                 SCTP_BUF_NEXT(m_end) = m_abort;
10960         }
10961         if (stcb->asoc.alternate) {
10962                 net = stcb->asoc.alternate;
10963         } else {
10964                 net = stcb->asoc.primary_destination;
10965         }
10966         /* Fill in the ABORT chunk header. */
10967         abort = mtod(m_abort, struct sctp_abort_chunk *);
10968         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10969         if (stcb->asoc.peer_vtag == 0) {
10970                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10971                 vtag = stcb->asoc.my_vtag;
10972                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10973         } else {
10974                 vtag = stcb->asoc.peer_vtag;
10975                 abort->ch.chunk_flags = 0;
10976         }
10977         abort->ch.chunk_length = htons(chunk_len);
10978         /* Add padding, if necessary. */
10979         if (padding_len > 0) {
10980                 if ((m_last == NULL) ||
10981                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10982                         sctp_m_freem(m_out);
10983                         return;
10984                 }
10985         }
10986         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10987             (struct sockaddr *)&net->ro._l_addr,
10988             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10989             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10990             stcb->asoc.primary_destination->port, NULL,
10991             0, 0,
10992             so_locked))) {
10993                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10994                 if (error == ENOBUFS) {
10995                         stcb->asoc.ifp_had_enobuf = 1;
10996                         SCTP_STAT_INCR(sctps_lowlevelerr);
10997                 }
10998         } else {
10999                 stcb->asoc.ifp_had_enobuf = 0;
11000         }
11001         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11002 }
11003
11004 void
11005 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11006     struct sctp_nets *net,
11007     int reflect_vtag)
11008 {
11009         /* formulate and SEND a SHUTDOWN-COMPLETE */
11010         struct mbuf *m_shutdown_comp;
11011         struct sctp_shutdown_complete_chunk *shutdown_complete;
11012         uint32_t vtag;
11013         int error;
11014         uint8_t flags;
11015
11016         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11017         if (m_shutdown_comp == NULL) {
11018                 /* no mbuf's */
11019                 return;
11020         }
11021         if (reflect_vtag) {
11022                 flags = SCTP_HAD_NO_TCB;
11023                 vtag = stcb->asoc.my_vtag;
11024         } else {
11025                 flags = 0;
11026                 vtag = stcb->asoc.peer_vtag;
11027         }
11028         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11029         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11030         shutdown_complete->ch.chunk_flags = flags;
11031         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11032         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11033         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11034             (struct sockaddr *)&net->ro._l_addr,
11035             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11036             stcb->sctp_ep->sctp_lport, stcb->rport,
11037             htonl(vtag),
11038             net->port, NULL,
11039             0, 0,
11040             SCTP_SO_NOT_LOCKED))) {
11041                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11042                 if (error == ENOBUFS) {
11043                         stcb->asoc.ifp_had_enobuf = 1;
11044                         SCTP_STAT_INCR(sctps_lowlevelerr);
11045                 }
11046         } else {
11047                 stcb->asoc.ifp_had_enobuf = 0;
11048         }
11049         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11050         return;
11051 }
11052
11053 static void
11054 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11055     struct sctphdr *sh, uint32_t vtag,
11056     uint8_t type, struct mbuf *cause,
11057     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11058     uint32_t vrf_id, uint16_t port)
11059 {
11060         struct mbuf *o_pak;
11061         struct mbuf *mout;
11062         struct sctphdr *shout;
11063         struct sctp_chunkhdr *ch;
11064 #if defined(INET) || defined(INET6)
11065         struct udphdr *udp;
11066 #endif
11067         int ret, len, cause_len, padding_len;
11068 #ifdef INET
11069         struct sockaddr_in *src_sin, *dst_sin;
11070         struct ip *ip;
11071 #endif
11072 #ifdef INET6
11073         struct sockaddr_in6 *src_sin6, *dst_sin6;
11074         struct ip6_hdr *ip6;
11075 #endif
11076
11077         /* Compute the length of the cause and add final padding. */
11078         cause_len = 0;
11079         if (cause != NULL) {
11080                 struct mbuf *m_at, *m_last = NULL;
11081
11082                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11083                         if (SCTP_BUF_NEXT(m_at) == NULL)
11084                                 m_last = m_at;
11085                         cause_len += SCTP_BUF_LEN(m_at);
11086                 }
11087                 padding_len = cause_len % 4;
11088                 if (padding_len != 0) {
11089                         padding_len = 4 - padding_len;
11090                 }
11091                 if (padding_len != 0) {
11092                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11093                                 sctp_m_freem(cause);
11094                                 return;
11095                         }
11096                 }
11097         } else {
11098                 padding_len = 0;
11099         }
11100         /* Get an mbuf for the header. */
11101         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11102         switch (dst->sa_family) {
11103 #ifdef INET
11104         case AF_INET:
11105                 len += sizeof(struct ip);
11106                 break;
11107 #endif
11108 #ifdef INET6
11109         case AF_INET6:
11110                 len += sizeof(struct ip6_hdr);
11111                 break;
11112 #endif
11113         default:
11114                 break;
11115         }
11116 #if defined(INET) || defined(INET6)
11117         if (port) {
11118                 len += sizeof(struct udphdr);
11119         }
11120 #endif
11121         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11122         if (mout == NULL) {
11123                 if (cause) {
11124                         sctp_m_freem(cause);
11125                 }
11126                 return;
11127         }
11128         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11129         SCTP_BUF_LEN(mout) = len;
11130         SCTP_BUF_NEXT(mout) = cause;
11131         M_SETFIB(mout, fibnum);
11132         mout->m_pkthdr.flowid = mflowid;
11133         M_HASHTYPE_SET(mout, mflowtype);
11134 #ifdef INET
11135         ip = NULL;
11136 #endif
11137 #ifdef INET6
11138         ip6 = NULL;
11139 #endif
11140         switch (dst->sa_family) {
11141 #ifdef INET
11142         case AF_INET:
11143                 src_sin = (struct sockaddr_in *)src;
11144                 dst_sin = (struct sockaddr_in *)dst;
11145                 ip = mtod(mout, struct ip *);
11146                 ip->ip_v = IPVERSION;
11147                 ip->ip_hl = (sizeof(struct ip) >> 2);
11148                 ip->ip_tos = 0;
11149                 ip->ip_off = htons(IP_DF);
11150                 ip_fillid(ip);
11151                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11152                 if (port) {
11153                         ip->ip_p = IPPROTO_UDP;
11154                 } else {
11155                         ip->ip_p = IPPROTO_SCTP;
11156                 }
11157                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11158                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11159                 ip->ip_sum = 0;
11160                 len = sizeof(struct ip);
11161                 shout = (struct sctphdr *)((caddr_t)ip + len);
11162                 break;
11163 #endif
11164 #ifdef INET6
11165         case AF_INET6:
11166                 src_sin6 = (struct sockaddr_in6 *)src;
11167                 dst_sin6 = (struct sockaddr_in6 *)dst;
11168                 ip6 = mtod(mout, struct ip6_hdr *);
11169                 ip6->ip6_flow = htonl(0x60000000);
11170                 if (V_ip6_auto_flowlabel) {
11171                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11172                 }
11173                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11174                 if (port) {
11175                         ip6->ip6_nxt = IPPROTO_UDP;
11176                 } else {
11177                         ip6->ip6_nxt = IPPROTO_SCTP;
11178                 }
11179                 ip6->ip6_src = dst_sin6->sin6_addr;
11180                 ip6->ip6_dst = src_sin6->sin6_addr;
11181                 len = sizeof(struct ip6_hdr);
11182                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11183                 break;
11184 #endif
11185         default:
11186                 len = 0;
11187                 shout = mtod(mout, struct sctphdr *);
11188                 break;
11189         }
11190 #if defined(INET) || defined(INET6)
11191         if (port) {
11192                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11193                         sctp_m_freem(mout);
11194                         return;
11195                 }
11196                 udp = (struct udphdr *)shout;
11197                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11198                 udp->uh_dport = port;
11199                 udp->uh_sum = 0;
11200                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11201                     sizeof(struct sctphdr) +
11202                     sizeof(struct sctp_chunkhdr) +
11203                     cause_len + padding_len));
11204                 len += sizeof(struct udphdr);
11205                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11206         } else {
11207                 udp = NULL;
11208         }
11209 #endif
11210         shout->src_port = sh->dest_port;
11211         shout->dest_port = sh->src_port;
11212         shout->checksum = 0;
11213         if (vtag) {
11214                 shout->v_tag = htonl(vtag);
11215         } else {
11216                 shout->v_tag = sh->v_tag;
11217         }
11218         len += sizeof(struct sctphdr);
11219         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11220         ch->chunk_type = type;
11221         if (vtag) {
11222                 ch->chunk_flags = 0;
11223         } else {
11224                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11225         }
11226         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11227         len += sizeof(struct sctp_chunkhdr);
11228         len += cause_len + padding_len;
11229
11230         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11231                 sctp_m_freem(mout);
11232                 return;
11233         }
11234         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11235         switch (dst->sa_family) {
11236 #ifdef INET
11237         case AF_INET:
11238                 if (port) {
11239                         if (V_udp_cksum) {
11240                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11241                         } else {
11242                                 udp->uh_sum = 0;
11243                         }
11244                 }
11245                 ip->ip_len = htons(len);
11246                 if (port) {
11247                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11248                         SCTP_STAT_INCR(sctps_sendswcrc);
11249                         if (V_udp_cksum) {
11250                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11251                         }
11252                 } else {
11253                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11254                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11255                         SCTP_STAT_INCR(sctps_sendhwcrc);
11256                 }
11257 #ifdef SCTP_PACKET_LOGGING
11258                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11259                         sctp_packet_log(o_pak);
11260                 }
11261 #endif
11262                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11263                 break;
11264 #endif
11265 #ifdef INET6
11266         case AF_INET6:
11267                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11268                 if (port) {
11269                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11270                         SCTP_STAT_INCR(sctps_sendswcrc);
11271                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11272                                 udp->uh_sum = 0xffff;
11273                         }
11274                 } else {
11275                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11276                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11277                         SCTP_STAT_INCR(sctps_sendhwcrc);
11278                 }
11279 #ifdef SCTP_PACKET_LOGGING
11280                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11281                         sctp_packet_log(o_pak);
11282                 }
11283 #endif
11284                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11285                 break;
11286 #endif
11287         default:
11288                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11289                     dst->sa_family);
11290                 sctp_m_freem(mout);
11291                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11292                 return;
11293         }
11294         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11295         if (port) {
11296                 UDPSTAT_INC(udps_opackets);
11297         }
11298         SCTP_STAT_INCR(sctps_sendpackets);
11299         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11300         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11301         if (ret) {
11302                 SCTP_STAT_INCR(sctps_senderrors);
11303         }
11304         return;
11305 }
11306
11307 void
11308 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11309     struct sctphdr *sh,
11310     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11311     uint32_t vrf_id, uint16_t port)
11312 {
11313         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11314             mflowtype, mflowid, fibnum,
11315             vrf_id, port);
11316 }
11317
11318 void
11319 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11320 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11321     SCTP_UNUSED
11322 #endif
11323 )
11324 {
11325         struct sctp_tmit_chunk *chk;
11326         struct sctp_heartbeat_chunk *hb;
11327         struct timeval now;
11328
11329         SCTP_TCB_LOCK_ASSERT(stcb);
11330         if (net == NULL) {
11331                 return;
11332         }
11333         (void)SCTP_GETTIME_TIMEVAL(&now);
11334         switch (net->ro._l_addr.sa.sa_family) {
11335 #ifdef INET
11336         case AF_INET:
11337                 break;
11338 #endif
11339 #ifdef INET6
11340         case AF_INET6:
11341                 break;
11342 #endif
11343         default:
11344                 return;
11345         }
11346         sctp_alloc_a_chunk(stcb, chk);
11347         if (chk == NULL) {
11348                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11349                 return;
11350         }
11351
11352         chk->copy_by_ref = 0;
11353         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11354         chk->rec.chunk_id.can_take_data = 1;
11355         chk->flags = 0;
11356         chk->asoc = &stcb->asoc;
11357         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11358
11359         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11360         if (chk->data == NULL) {
11361                 sctp_free_a_chunk(stcb, chk, so_locked);
11362                 return;
11363         }
11364         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11365         SCTP_BUF_LEN(chk->data) = chk->send_size;
11366         chk->sent = SCTP_DATAGRAM_UNSENT;
11367         chk->snd_count = 0;
11368         chk->whoTo = net;
11369         atomic_add_int(&chk->whoTo->ref_count, 1);
11370         /* Now we have a mbuf that we can fill in with the details */
11371         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11372         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11373         /* fill out chunk header */
11374         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11375         hb->ch.chunk_flags = 0;
11376         hb->ch.chunk_length = htons(chk->send_size);
11377         /* Fill out hb parameter */
11378         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11379         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11380         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11381         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11382         /* Did our user request this one, put it in */
11383         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11384         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11385         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11386                 /*
11387                  * we only take from the entropy pool if the address is not
11388                  * confirmed.
11389                  */
11390                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11391                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11392         } else {
11393                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11394                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11395         }
11396         switch (net->ro._l_addr.sa.sa_family) {
11397 #ifdef INET
11398         case AF_INET:
11399                 memcpy(hb->heartbeat.hb_info.address,
11400                     &net->ro._l_addr.sin.sin_addr,
11401                     sizeof(net->ro._l_addr.sin.sin_addr));
11402                 break;
11403 #endif
11404 #ifdef INET6
11405         case AF_INET6:
11406                 memcpy(hb->heartbeat.hb_info.address,
11407                     &net->ro._l_addr.sin6.sin6_addr,
11408                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11409                 break;
11410 #endif
11411         default:
11412                 if (chk->data) {
11413                         sctp_m_freem(chk->data);
11414                         chk->data = NULL;
11415                 }
11416                 sctp_free_a_chunk(stcb, chk, so_locked);
11417                 return;
11418                 break;
11419         }
11420         net->hb_responded = 0;
11421         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11422         stcb->asoc.ctrl_queue_cnt++;
11423         SCTP_STAT_INCR(sctps_sendheartbeat);
11424         return;
11425 }
11426
11427 void
11428 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11429     uint32_t high_tsn)
11430 {
11431         struct sctp_association *asoc;
11432         struct sctp_ecne_chunk *ecne;
11433         struct sctp_tmit_chunk *chk;
11434
11435         if (net == NULL) {
11436                 return;
11437         }
11438         asoc = &stcb->asoc;
11439         SCTP_TCB_LOCK_ASSERT(stcb);
11440         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11441                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11442                         /* found a previous ECN_ECHO update it if needed */
11443                         uint32_t cnt, ctsn;
11444
11445                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11446                         ctsn = ntohl(ecne->tsn);
11447                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11448                                 ecne->tsn = htonl(high_tsn);
11449                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11450                         }
11451                         cnt = ntohl(ecne->num_pkts_since_cwr);
11452                         cnt++;
11453                         ecne->num_pkts_since_cwr = htonl(cnt);
11454                         return;
11455                 }
11456         }
11457         /* nope could not find one to update so we must build one */
11458         sctp_alloc_a_chunk(stcb, chk);
11459         if (chk == NULL) {
11460                 return;
11461         }
11462         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11463         chk->copy_by_ref = 0;
11464         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11465         chk->rec.chunk_id.can_take_data = 0;
11466         chk->flags = 0;
11467         chk->asoc = &stcb->asoc;
11468         chk->send_size = sizeof(struct sctp_ecne_chunk);
11469         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11470         if (chk->data == NULL) {
11471                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11472                 return;
11473         }
11474         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11475         SCTP_BUF_LEN(chk->data) = chk->send_size;
11476         chk->sent = SCTP_DATAGRAM_UNSENT;
11477         chk->snd_count = 0;
11478         chk->whoTo = net;
11479         atomic_add_int(&chk->whoTo->ref_count, 1);
11480
11481         stcb->asoc.ecn_echo_cnt_onq++;
11482         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11483         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11484         ecne->ch.chunk_flags = 0;
11485         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11486         ecne->tsn = htonl(high_tsn);
11487         ecne->num_pkts_since_cwr = htonl(1);
11488         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11489         asoc->ctrl_queue_cnt++;
11490 }
11491
11492 void
11493 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11494     struct mbuf *m, int len, int iphlen, int bad_crc)
11495 {
11496         struct sctp_association *asoc;
11497         struct sctp_pktdrop_chunk *drp;
11498         struct sctp_tmit_chunk *chk;
11499         uint8_t *datap;
11500         int was_trunc = 0;
11501         int fullsz = 0;
11502         long spc;
11503         int offset;
11504         struct sctp_chunkhdr *ch, chunk_buf;
11505         unsigned int chk_length;
11506
11507         if (!stcb) {
11508                 return;
11509         }
11510         asoc = &stcb->asoc;
11511         SCTP_TCB_LOCK_ASSERT(stcb);
11512         if (asoc->pktdrop_supported == 0) {
11513                 /*-
11514                  * peer must declare support before I send one.
11515                  */
11516                 return;
11517         }
11518         if (stcb->sctp_socket == NULL) {
11519                 return;
11520         }
11521         sctp_alloc_a_chunk(stcb, chk);
11522         if (chk == NULL) {
11523                 return;
11524         }
11525         chk->copy_by_ref = 0;
11526         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11527         chk->rec.chunk_id.can_take_data = 1;
11528         chk->flags = 0;
11529         len -= iphlen;
11530         chk->send_size = len;
11531         /* Validate that we do not have an ABORT in here. */
11532         offset = iphlen + sizeof(struct sctphdr);
11533         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11534             sizeof(*ch), (uint8_t *)&chunk_buf);
11535         while (ch != NULL) {
11536                 chk_length = ntohs(ch->chunk_length);
11537                 if (chk_length < sizeof(*ch)) {
11538                         /* break to abort land */
11539                         break;
11540                 }
11541                 switch (ch->chunk_type) {
11542                 case SCTP_PACKET_DROPPED:
11543                 case SCTP_ABORT_ASSOCIATION:
11544                 case SCTP_INITIATION_ACK:
11545                         /**
11546                          * We don't respond with an PKT-DROP to an ABORT
11547                          * or PKT-DROP. We also do not respond to an
11548                          * INIT-ACK, because we can't know if the initiation
11549                          * tag is correct or not.
11550                          */
11551                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11552                         return;
11553                 default:
11554                         break;
11555                 }
11556                 offset += SCTP_SIZE32(chk_length);
11557                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11558                     sizeof(*ch), (uint8_t *)&chunk_buf);
11559         }
11560
11561         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11562             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11563                 /*
11564                  * only send 1 mtu worth, trim off the excess on the end.
11565                  */
11566                 fullsz = len;
11567                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11568                 was_trunc = 1;
11569         }
11570         chk->asoc = &stcb->asoc;
11571         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11572         if (chk->data == NULL) {
11573 jump_out:
11574                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11575                 return;
11576         }
11577         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11578         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11579         if (drp == NULL) {
11580                 sctp_m_freem(chk->data);
11581                 chk->data = NULL;
11582                 goto jump_out;
11583         }
11584         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11585             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11586         chk->book_size_scale = 0;
11587         if (was_trunc) {
11588                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11589                 drp->trunc_len = htons(fullsz);
11590                 /*
11591                  * Len is already adjusted to size minus overhead above take
11592                  * out the pkt_drop chunk itself from it.
11593                  */
11594                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11595                 len = chk->send_size;
11596         } else {
11597                 /* no truncation needed */
11598                 drp->ch.chunk_flags = 0;
11599                 drp->trunc_len = htons(0);
11600         }
11601         if (bad_crc) {
11602                 drp->ch.chunk_flags |= SCTP_BADCRC;
11603         }
11604         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11605         SCTP_BUF_LEN(chk->data) = chk->send_size;
11606         chk->sent = SCTP_DATAGRAM_UNSENT;
11607         chk->snd_count = 0;
11608         if (net) {
11609                 /* we should hit here */
11610                 chk->whoTo = net;
11611                 atomic_add_int(&chk->whoTo->ref_count, 1);
11612         } else {
11613                 chk->whoTo = NULL;
11614         }
11615         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11616         drp->ch.chunk_length = htons(chk->send_size);
11617         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11618         if (spc < 0) {
11619                 spc = 0;
11620         }
11621         drp->bottle_bw = htonl(spc);
11622         if (asoc->my_rwnd) {
11623                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11624                     asoc->size_on_all_streams +
11625                     asoc->my_rwnd_control_len +
11626                     stcb->sctp_socket->so_rcv.sb_cc);
11627         } else {
11628                 /*-
11629                  * If my rwnd is 0, possibly from mbuf depletion as well as
11630                  * space used, tell the peer there is NO space aka onq == bw
11631                  */
11632                 drp->current_onq = htonl(spc);
11633         }
11634         drp->reserved = 0;
11635         datap = drp->data;
11636         m_copydata(m, iphlen, len, (caddr_t)datap);
11637         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11638         asoc->ctrl_queue_cnt++;
11639 }
11640
11641 void
11642 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11643 {
11644         struct sctp_association *asoc;
11645         struct sctp_cwr_chunk *cwr;
11646         struct sctp_tmit_chunk *chk;
11647
11648         SCTP_TCB_LOCK_ASSERT(stcb);
11649         if (net == NULL) {
11650                 return;
11651         }
11652         asoc = &stcb->asoc;
11653         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11654                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11655                         /*
11656                          * found a previous CWR queued to same destination
11657                          * update it if needed
11658                          */
11659                         uint32_t ctsn;
11660
11661                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11662                         ctsn = ntohl(cwr->tsn);
11663                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11664                                 cwr->tsn = htonl(high_tsn);
11665                         }
11666                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11667                                 /* Make sure override is carried */
11668                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11669                         }
11670                         return;
11671                 }
11672         }
11673         sctp_alloc_a_chunk(stcb, chk);
11674         if (chk == NULL) {
11675                 return;
11676         }
11677         chk->copy_by_ref = 0;
11678         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11679         chk->rec.chunk_id.can_take_data = 1;
11680         chk->flags = 0;
11681         chk->asoc = &stcb->asoc;
11682         chk->send_size = sizeof(struct sctp_cwr_chunk);
11683         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11684         if (chk->data == NULL) {
11685                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11686                 return;
11687         }
11688         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11689         SCTP_BUF_LEN(chk->data) = chk->send_size;
11690         chk->sent = SCTP_DATAGRAM_UNSENT;
11691         chk->snd_count = 0;
11692         chk->whoTo = net;
11693         atomic_add_int(&chk->whoTo->ref_count, 1);
11694         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11695         cwr->ch.chunk_type = SCTP_ECN_CWR;
11696         cwr->ch.chunk_flags = override;
11697         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11698         cwr->tsn = htonl(high_tsn);
11699         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11700         asoc->ctrl_queue_cnt++;
11701 }
11702
11703 static int
11704 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11705     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11706 {
11707         uint16_t len, old_len, i;
11708         struct sctp_stream_reset_out_request *req_out;
11709         struct sctp_chunkhdr *ch;
11710         int at;
11711         int number_entries = 0;
11712
11713         ch = mtod(chk->data, struct sctp_chunkhdr *);
11714         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11715         /* get to new offset for the param. */
11716         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11717         /* now how long will this param be? */
11718         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11719                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11720                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11721                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11722                         number_entries++;
11723                 }
11724         }
11725         if (number_entries == 0) {
11726                 return (0);
11727         }
11728         if (number_entries == stcb->asoc.streamoutcnt) {
11729                 number_entries = 0;
11730         }
11731         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11732                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11733         }
11734         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11735         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11736         req_out->ph.param_length = htons(len);
11737         req_out->request_seq = htonl(seq);
11738         req_out->response_seq = htonl(resp_seq);
11739         req_out->send_reset_at_tsn = htonl(last_sent);
11740         at = 0;
11741         if (number_entries) {
11742                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11743                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11744                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11745                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11746                                 req_out->list_of_streams[at] = htons(i);
11747                                 at++;
11748                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11749                                 if (at >= number_entries) {
11750                                         break;
11751                                 }
11752                         }
11753                 }
11754         } else {
11755                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11756                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11757                 }
11758         }
11759         if (SCTP_SIZE32(len) > len) {
11760                 /*-
11761                  * Need to worry about the pad we may end up adding to the
11762                  * end. This is easy since the struct is either aligned to 4
11763                  * bytes or 2 bytes off.
11764                  */
11765                 req_out->list_of_streams[number_entries] = 0;
11766         }
11767         /* now fix the chunk length */
11768         ch->chunk_length = htons(len + old_len);
11769         chk->book_size = len + old_len;
11770         chk->book_size_scale = 0;
11771         chk->send_size = SCTP_SIZE32(chk->book_size);
11772         SCTP_BUF_LEN(chk->data) = chk->send_size;
11773         return (1);
11774 }
11775
11776 static void
11777 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11778     int number_entries, uint16_t *list,
11779     uint32_t seq)
11780 {
11781         uint16_t len, old_len, i;
11782         struct sctp_stream_reset_in_request *req_in;
11783         struct sctp_chunkhdr *ch;
11784
11785         ch = mtod(chk->data, struct sctp_chunkhdr *);
11786         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11787
11788         /* get to new offset for the param. */
11789         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11790         /* now how long will this param be? */
11791         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11792         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11793         req_in->ph.param_length = htons(len);
11794         req_in->request_seq = htonl(seq);
11795         if (number_entries) {
11796                 for (i = 0; i < number_entries; i++) {
11797                         req_in->list_of_streams[i] = htons(list[i]);
11798                 }
11799         }
11800         if (SCTP_SIZE32(len) > len) {
11801                 /*-
11802                  * Need to worry about the pad we may end up adding to the
11803                  * end. This is easy since the struct is either aligned to 4
11804                  * bytes or 2 bytes off.
11805                  */
11806                 req_in->list_of_streams[number_entries] = 0;
11807         }
11808         /* now fix the chunk length */
11809         ch->chunk_length = htons(len + old_len);
11810         chk->book_size = len + old_len;
11811         chk->book_size_scale = 0;
11812         chk->send_size = SCTP_SIZE32(chk->book_size);
11813         SCTP_BUF_LEN(chk->data) = chk->send_size;
11814         return;
11815 }
11816
11817 static void
11818 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11819     uint32_t seq)
11820 {
11821         uint16_t len, old_len;
11822         struct sctp_stream_reset_tsn_request *req_tsn;
11823         struct sctp_chunkhdr *ch;
11824
11825         ch = mtod(chk->data, struct sctp_chunkhdr *);
11826         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11827
11828         /* get to new offset for the param. */
11829         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11830         /* now how long will this param be? */
11831         len = sizeof(struct sctp_stream_reset_tsn_request);
11832         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11833         req_tsn->ph.param_length = htons(len);
11834         req_tsn->request_seq = htonl(seq);
11835
11836         /* now fix the chunk length */
11837         ch->chunk_length = htons(len + old_len);
11838         chk->send_size = len + old_len;
11839         chk->book_size = SCTP_SIZE32(chk->send_size);
11840         chk->book_size_scale = 0;
11841         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11842         return;
11843 }
11844
11845 void
11846 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11847     uint32_t resp_seq, uint32_t result)
11848 {
11849         uint16_t len, old_len;
11850         struct sctp_stream_reset_response *resp;
11851         struct sctp_chunkhdr *ch;
11852
11853         ch = mtod(chk->data, struct sctp_chunkhdr *);
11854         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11855
11856         /* get to new offset for the param. */
11857         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11858         /* now how long will this param be? */
11859         len = sizeof(struct sctp_stream_reset_response);
11860         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11861         resp->ph.param_length = htons(len);
11862         resp->response_seq = htonl(resp_seq);
11863         resp->result = ntohl(result);
11864
11865         /* now fix the chunk length */
11866         ch->chunk_length = htons(len + old_len);
11867         chk->book_size = len + old_len;
11868         chk->book_size_scale = 0;
11869         chk->send_size = SCTP_SIZE32(chk->book_size);
11870         SCTP_BUF_LEN(chk->data) = chk->send_size;
11871         return;
11872 }
11873
11874 void
11875 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11876     struct sctp_stream_reset_list *ent,
11877     int response)
11878 {
11879         struct sctp_association *asoc;
11880         struct sctp_tmit_chunk *chk;
11881         struct sctp_chunkhdr *ch;
11882
11883         asoc = &stcb->asoc;
11884
11885         /*
11886          * Reset our last reset action to the new one IP -> response
11887          * (PERFORMED probably). This assures that if we fail to send, a
11888          * retran from the peer will get the new response.
11889          */
11890         asoc->last_reset_action[0] = response;
11891         if (asoc->stream_reset_outstanding) {
11892                 return;
11893         }
11894         sctp_alloc_a_chunk(stcb, chk);
11895         if (chk == NULL) {
11896                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11897                 return;
11898         }
11899         chk->copy_by_ref = 0;
11900         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11901         chk->rec.chunk_id.can_take_data = 0;
11902         chk->flags = 0;
11903         chk->asoc = &stcb->asoc;
11904         chk->book_size = sizeof(struct sctp_chunkhdr);
11905         chk->send_size = SCTP_SIZE32(chk->book_size);
11906         chk->book_size_scale = 0;
11907         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11908         if (chk->data == NULL) {
11909                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11910                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11911                 return;
11912         }
11913         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11914         /* setup chunk parameters */
11915         chk->sent = SCTP_DATAGRAM_UNSENT;
11916         chk->snd_count = 0;
11917         if (stcb->asoc.alternate) {
11918                 chk->whoTo = stcb->asoc.alternate;
11919         } else {
11920                 chk->whoTo = stcb->asoc.primary_destination;
11921         }
11922         ch = mtod(chk->data, struct sctp_chunkhdr *);
11923         ch->chunk_type = SCTP_STREAM_RESET;
11924         ch->chunk_flags = 0;
11925         ch->chunk_length = htons(chk->book_size);
11926         atomic_add_int(&chk->whoTo->ref_count, 1);
11927         SCTP_BUF_LEN(chk->data) = chk->send_size;
11928         sctp_add_stream_reset_result(chk, ent->seq, response);
11929         /* insert the chunk for sending */
11930         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11931             chk,
11932             sctp_next);
11933         asoc->ctrl_queue_cnt++;
11934 }
11935
11936 void
11937 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11938     uint32_t resp_seq, uint32_t result,
11939     uint32_t send_una, uint32_t recv_next)
11940 {
11941         uint16_t len, old_len;
11942         struct sctp_stream_reset_response_tsn *resp;
11943         struct sctp_chunkhdr *ch;
11944
11945         ch = mtod(chk->data, struct sctp_chunkhdr *);
11946         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11947
11948         /* get to new offset for the param. */
11949         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11950         /* now how long will this param be? */
11951         len = sizeof(struct sctp_stream_reset_response_tsn);
11952         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11953         resp->ph.param_length = htons(len);
11954         resp->response_seq = htonl(resp_seq);
11955         resp->result = htonl(result);
11956         resp->senders_next_tsn = htonl(send_una);
11957         resp->receivers_next_tsn = htonl(recv_next);
11958
11959         /* now fix the chunk length */
11960         ch->chunk_length = htons(len + old_len);
11961         chk->book_size = len + old_len;
11962         chk->send_size = SCTP_SIZE32(chk->book_size);
11963         chk->book_size_scale = 0;
11964         SCTP_BUF_LEN(chk->data) = chk->send_size;
11965         return;
11966 }
11967
11968 static void
11969 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11970     uint32_t seq,
11971     uint16_t adding)
11972 {
11973         uint16_t len, old_len;
11974         struct sctp_chunkhdr *ch;
11975         struct sctp_stream_reset_add_strm *addstr;
11976
11977         ch = mtod(chk->data, struct sctp_chunkhdr *);
11978         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11979
11980         /* get to new offset for the param. */
11981         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11982         /* now how long will this param be? */
11983         len = sizeof(struct sctp_stream_reset_add_strm);
11984
11985         /* Fill it out. */
11986         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11987         addstr->ph.param_length = htons(len);
11988         addstr->request_seq = htonl(seq);
11989         addstr->number_of_streams = htons(adding);
11990         addstr->reserved = 0;
11991
11992         /* now fix the chunk length */
11993         ch->chunk_length = htons(len + old_len);
11994         chk->send_size = len + old_len;
11995         chk->book_size = SCTP_SIZE32(chk->send_size);
11996         chk->book_size_scale = 0;
11997         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11998         return;
11999 }
12000
12001 static void
12002 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12003     uint32_t seq,
12004     uint16_t adding)
12005 {
12006         uint16_t len, old_len;
12007         struct sctp_chunkhdr *ch;
12008         struct sctp_stream_reset_add_strm *addstr;
12009
12010         ch = mtod(chk->data, struct sctp_chunkhdr *);
12011         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12012
12013         /* get to new offset for the param. */
12014         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12015         /* now how long will this param be? */
12016         len = sizeof(struct sctp_stream_reset_add_strm);
12017         /* Fill it out. */
12018         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12019         addstr->ph.param_length = htons(len);
12020         addstr->request_seq = htonl(seq);
12021         addstr->number_of_streams = htons(adding);
12022         addstr->reserved = 0;
12023
12024         /* now fix the chunk length */
12025         ch->chunk_length = htons(len + old_len);
12026         chk->send_size = len + old_len;
12027         chk->book_size = SCTP_SIZE32(chk->send_size);
12028         chk->book_size_scale = 0;
12029         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12030         return;
12031 }
12032
12033 int
12034 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12035 {
12036         struct sctp_association *asoc;
12037         struct sctp_tmit_chunk *chk;
12038         struct sctp_chunkhdr *ch;
12039         uint32_t seq;
12040
12041         asoc = &stcb->asoc;
12042         asoc->trigger_reset = 0;
12043         if (asoc->stream_reset_outstanding) {
12044                 return (EALREADY);
12045         }
12046         sctp_alloc_a_chunk(stcb, chk);
12047         if (chk == NULL) {
12048                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12049                 return (ENOMEM);
12050         }
12051         chk->copy_by_ref = 0;
12052         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12053         chk->rec.chunk_id.can_take_data = 0;
12054         chk->flags = 0;
12055         chk->asoc = &stcb->asoc;
12056         chk->book_size = sizeof(struct sctp_chunkhdr);
12057         chk->send_size = SCTP_SIZE32(chk->book_size);
12058         chk->book_size_scale = 0;
12059         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12060         if (chk->data == NULL) {
12061                 sctp_free_a_chunk(stcb, chk, so_locked);
12062                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12063                 return (ENOMEM);
12064         }
12065         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12066
12067         /* setup chunk parameters */
12068         chk->sent = SCTP_DATAGRAM_UNSENT;
12069         chk->snd_count = 0;
12070         if (stcb->asoc.alternate) {
12071                 chk->whoTo = stcb->asoc.alternate;
12072         } else {
12073                 chk->whoTo = stcb->asoc.primary_destination;
12074         }
12075         ch = mtod(chk->data, struct sctp_chunkhdr *);
12076         ch->chunk_type = SCTP_STREAM_RESET;
12077         ch->chunk_flags = 0;
12078         ch->chunk_length = htons(chk->book_size);
12079         atomic_add_int(&chk->whoTo->ref_count, 1);
12080         SCTP_BUF_LEN(chk->data) = chk->send_size;
12081         seq = stcb->asoc.str_reset_seq_out;
12082         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12083                 seq++;
12084                 asoc->stream_reset_outstanding++;
12085         } else {
12086                 m_freem(chk->data);
12087                 chk->data = NULL;
12088                 sctp_free_a_chunk(stcb, chk, so_locked);
12089                 return (ENOENT);
12090         }
12091         asoc->str_reset = chk;
12092         /* insert the chunk for sending */
12093         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12094             chk,
12095             sctp_next);
12096         asoc->ctrl_queue_cnt++;
12097
12098         if (stcb->asoc.send_sack) {
12099                 sctp_send_sack(stcb, so_locked);
12100         }
12101         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12102         return (0);
12103 }
12104
12105 int
12106 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12107     uint16_t number_entries, uint16_t *list,
12108     uint8_t send_in_req,
12109     uint8_t send_tsn_req,
12110     uint8_t add_stream,
12111     uint16_t adding_o,
12112     uint16_t adding_i, uint8_t peer_asked)
12113 {
12114         struct sctp_association *asoc;
12115         struct sctp_tmit_chunk *chk;
12116         struct sctp_chunkhdr *ch;
12117         int can_send_out_req = 0;
12118         uint32_t seq;
12119
12120         asoc = &stcb->asoc;
12121         if (asoc->stream_reset_outstanding) {
12122                 /*-
12123                  * Already one pending, must get ACK back to clear the flag.
12124                  */
12125                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12126                 return (EBUSY);
12127         }
12128         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12129             (add_stream == 0)) {
12130                 /* nothing to do */
12131                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12132                 return (EINVAL);
12133         }
12134         if (send_tsn_req && send_in_req) {
12135                 /* error, can't do that */
12136                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12137                 return (EINVAL);
12138         } else if (send_in_req) {
12139                 can_send_out_req = 1;
12140         }
12141         if (number_entries > (MCLBYTES -
12142             SCTP_MIN_OVERHEAD -
12143             sizeof(struct sctp_chunkhdr) -
12144             sizeof(struct sctp_stream_reset_out_request)) /
12145             sizeof(uint16_t)) {
12146                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12147                 return (ENOMEM);
12148         }
12149         sctp_alloc_a_chunk(stcb, chk);
12150         if (chk == NULL) {
12151                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12152                 return (ENOMEM);
12153         }
12154         chk->copy_by_ref = 0;
12155         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12156         chk->rec.chunk_id.can_take_data = 0;
12157         chk->flags = 0;
12158         chk->asoc = &stcb->asoc;
12159         chk->book_size = sizeof(struct sctp_chunkhdr);
12160         chk->send_size = SCTP_SIZE32(chk->book_size);
12161         chk->book_size_scale = 0;
12162         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12163         if (chk->data == NULL) {
12164                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12165                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12166                 return (ENOMEM);
12167         }
12168         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12169
12170         /* setup chunk parameters */
12171         chk->sent = SCTP_DATAGRAM_UNSENT;
12172         chk->snd_count = 0;
12173         if (stcb->asoc.alternate) {
12174                 chk->whoTo = stcb->asoc.alternate;
12175         } else {
12176                 chk->whoTo = stcb->asoc.primary_destination;
12177         }
12178         atomic_add_int(&chk->whoTo->ref_count, 1);
12179         ch = mtod(chk->data, struct sctp_chunkhdr *);
12180         ch->chunk_type = SCTP_STREAM_RESET;
12181         ch->chunk_flags = 0;
12182         ch->chunk_length = htons(chk->book_size);
12183         SCTP_BUF_LEN(chk->data) = chk->send_size;
12184
12185         seq = stcb->asoc.str_reset_seq_out;
12186         if (can_send_out_req) {
12187                 int ret;
12188
12189                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12190                 if (ret) {
12191                         seq++;
12192                         asoc->stream_reset_outstanding++;
12193                 }
12194         }
12195         if ((add_stream & 1) &&
12196             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12197                 /* Need to allocate more */
12198                 struct sctp_stream_out *oldstream;
12199                 struct sctp_stream_queue_pending *sp, *nsp;
12200                 int i;
12201 #if defined(SCTP_DETAILED_STR_STATS)
12202                 int j;
12203 #endif
12204
12205                 oldstream = stcb->asoc.strmout;
12206                 /* get some more */
12207                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12208                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12209                     SCTP_M_STRMO);
12210                 if (stcb->asoc.strmout == NULL) {
12211                         uint8_t x;
12212
12213                         stcb->asoc.strmout = oldstream;
12214                         /* Turn off the bit */
12215                         x = add_stream & 0xfe;
12216                         add_stream = x;
12217                         goto skip_stuff;
12218                 }
12219                 /*
12220                  * Ok now we proceed with copying the old out stuff and
12221                  * initializing the new stuff.
12222                  */
12223                 SCTP_TCB_SEND_LOCK(stcb);
12224                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12225                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12226                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12227                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12228                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12229                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12230                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12231                         stcb->asoc.strmout[i].sid = i;
12232                         stcb->asoc.strmout[i].state = oldstream[i].state;
12233                         /* FIX ME FIX ME */
12234                         /*
12235                          * This should be a SS_COPY operation FIX ME STREAM
12236                          * SCHEDULER EXPERT
12237                          */
12238                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12239                         /* now anything on those queues? */
12240                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12241                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12242                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12243                         }
12244
12245                 }
12246                 /* now the new streams */
12247                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12248                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12249                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12250                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12251 #if defined(SCTP_DETAILED_STR_STATS)
12252                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12253                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12254                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12255                         }
12256 #else
12257                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12258                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12259 #endif
12260                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12261                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12262                         stcb->asoc.strmout[i].sid = i;
12263                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12264                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12265                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12266                 }
12267                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12268                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12269                 SCTP_TCB_SEND_UNLOCK(stcb);
12270         }
12271 skip_stuff:
12272         if ((add_stream & 1) && (adding_o > 0)) {
12273                 asoc->strm_pending_add_size = adding_o;
12274                 asoc->peer_req_out = peer_asked;
12275                 sctp_add_an_out_stream(chk, seq, adding_o);
12276                 seq++;
12277                 asoc->stream_reset_outstanding++;
12278         }
12279         if ((add_stream & 2) && (adding_i > 0)) {
12280                 sctp_add_an_in_stream(chk, seq, adding_i);
12281                 seq++;
12282                 asoc->stream_reset_outstanding++;
12283         }
12284         if (send_in_req) {
12285                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12286                 seq++;
12287                 asoc->stream_reset_outstanding++;
12288         }
12289         if (send_tsn_req) {
12290                 sctp_add_stream_reset_tsn(chk, seq);
12291                 asoc->stream_reset_outstanding++;
12292         }
12293         asoc->str_reset = chk;
12294         /* insert the chunk for sending */
12295         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12296             chk,
12297             sctp_next);
12298         asoc->ctrl_queue_cnt++;
12299         if (stcb->asoc.send_sack) {
12300                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12301         }
12302         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12303         return (0);
12304 }
12305
12306 void
12307 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12308     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12309     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12310     uint32_t vrf_id, uint16_t port)
12311 {
12312         /* Don't respond to an ABORT with an ABORT. */
12313         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12314                 if (cause)
12315                         sctp_m_freem(cause);
12316                 return;
12317         }
12318         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12319             mflowtype, mflowid, fibnum,
12320             vrf_id, port);
12321         return;
12322 }
12323
12324 void
12325 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12326     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12327     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12328     uint32_t vrf_id, uint16_t port)
12329 {
12330         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12331             mflowtype, mflowid, fibnum,
12332             vrf_id, port);
12333         return;
12334 }
12335
12336 static struct mbuf *
12337 sctp_copy_resume(struct uio *uio,
12338     int max_send_len,
12339     int user_marks_eor,
12340     int *error,
12341     uint32_t *sndout,
12342     struct mbuf **new_tail)
12343 {
12344         struct mbuf *m;
12345
12346         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12347             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12348         if (m == NULL) {
12349                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12350                 *error = ENOBUFS;
12351         } else {
12352                 *sndout = m_length(m, NULL);
12353                 *new_tail = m_last(m);
12354         }
12355         return (m);
12356 }
12357
12358 static int
12359 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12360     struct uio *uio,
12361     int resv_upfront)
12362 {
12363         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12364             resv_upfront, 0);
12365         if (sp->data == NULL) {
12366                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12367                 return (ENOBUFS);
12368         }
12369
12370         sp->tail_mbuf = m_last(sp->data);
12371         return (0);
12372 }
12373
12374
12375
12376 static struct sctp_stream_queue_pending *
12377 sctp_copy_it_in(struct sctp_tcb *stcb,
12378     struct sctp_association *asoc,
12379     struct sctp_sndrcvinfo *srcv,
12380     struct uio *uio,
12381     struct sctp_nets *net,
12382     ssize_t max_send_len,
12383     int user_marks_eor,
12384     int *error)
12385 {
12386
12387         /*-
12388          * This routine must be very careful in its work. Protocol
12389          * processing is up and running so care must be taken to spl...()
12390          * when you need to do something that may effect the stcb/asoc. The
12391          * sb is locked however. When data is copied the protocol processing
12392          * should be enabled since this is a slower operation...
12393          */
12394         struct sctp_stream_queue_pending *sp = NULL;
12395         int resv_in_first;
12396
12397         *error = 0;
12398         /* Now can we send this? */
12399         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12400             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12401             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12402             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12403                 /* got data while shutting down */
12404                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12405                 *error = ECONNRESET;
12406                 goto out_now;
12407         }
12408         sctp_alloc_a_strmoq(stcb, sp);
12409         if (sp == NULL) {
12410                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12411                 *error = ENOMEM;
12412                 goto out_now;
12413         }
12414         sp->act_flags = 0;
12415         sp->sender_all_done = 0;
12416         sp->sinfo_flags = srcv->sinfo_flags;
12417         sp->timetolive = srcv->sinfo_timetolive;
12418         sp->ppid = srcv->sinfo_ppid;
12419         sp->context = srcv->sinfo_context;
12420         sp->fsn = 0;
12421         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12422
12423         sp->sid = srcv->sinfo_stream;
12424         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12425         if ((sp->length == (uint32_t)uio->uio_resid) &&
12426             ((user_marks_eor == 0) ||
12427             (srcv->sinfo_flags & SCTP_EOF) ||
12428             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12429                 sp->msg_is_complete = 1;
12430         } else {
12431                 sp->msg_is_complete = 0;
12432         }
12433         sp->sender_all_done = 0;
12434         sp->some_taken = 0;
12435         sp->put_last_out = 0;
12436         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12437         sp->data = sp->tail_mbuf = NULL;
12438         if (sp->length == 0) {
12439                 goto skip_copy;
12440         }
12441         if (srcv->sinfo_keynumber_valid) {
12442                 sp->auth_keyid = srcv->sinfo_keynumber;
12443         } else {
12444                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12445         }
12446         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12447                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12448                 sp->holds_key_ref = 1;
12449         }
12450         *error = sctp_copy_one(sp, uio, resv_in_first);
12451 skip_copy:
12452         if (*error) {
12453                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12454                 sp = NULL;
12455         } else {
12456                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12457                         sp->net = net;
12458                         atomic_add_int(&sp->net->ref_count, 1);
12459                 } else {
12460                         sp->net = NULL;
12461                 }
12462                 sctp_set_prsctp_policy(sp);
12463         }
12464 out_now:
12465         return (sp);
12466 }
12467
12468
12469 int
12470 sctp_sosend(struct socket *so,
12471     struct sockaddr *addr,
12472     struct uio *uio,
12473     struct mbuf *top,
12474     struct mbuf *control,
12475     int flags,
12476     struct thread *p
12477 )
12478 {
12479         int error, use_sndinfo = 0;
12480         struct sctp_sndrcvinfo sndrcvninfo;
12481         struct sockaddr *addr_to_use;
12482 #if defined(INET) && defined(INET6)
12483         struct sockaddr_in sin;
12484 #endif
12485
12486         if (control) {
12487                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12488                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12489                     sizeof(sndrcvninfo))) {
12490                         /* got one */
12491                         use_sndinfo = 1;
12492                 }
12493         }
12494         addr_to_use = addr;
12495 #if defined(INET) && defined(INET6)
12496         if ((addr) && (addr->sa_family == AF_INET6)) {
12497                 struct sockaddr_in6 *sin6;
12498
12499                 sin6 = (struct sockaddr_in6 *)addr;
12500                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12501                         in6_sin6_2_sin(&sin, sin6);
12502                         addr_to_use = (struct sockaddr *)&sin;
12503                 }
12504         }
12505 #endif
12506         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12507             control,
12508             flags,
12509             use_sndinfo ? &sndrcvninfo : NULL
12510             ,p
12511             );
12512         return (error);
12513 }
12514
12515
12516 int
12517 sctp_lower_sosend(struct socket *so,
12518     struct sockaddr *addr,
12519     struct uio *uio,
12520     struct mbuf *i_pak,
12521     struct mbuf *control,
12522     int flags,
12523     struct sctp_sndrcvinfo *srcv
12524     ,
12525     struct thread *p
12526 )
12527 {
12528         ssize_t sndlen = 0, max_len;
12529         int error, len;
12530         struct mbuf *top = NULL;
12531         int queue_only = 0, queue_only_for_init = 0;
12532         int free_cnt_applied = 0;
12533         int un_sent;
12534         int now_filled = 0;
12535         unsigned int inqueue_bytes = 0;
12536         struct sctp_block_entry be;
12537         struct sctp_inpcb *inp;
12538         struct sctp_tcb *stcb = NULL;
12539         struct timeval now;
12540         struct sctp_nets *net;
12541         struct sctp_association *asoc;
12542         struct sctp_inpcb *t_inp;
12543         int user_marks_eor;
12544         int create_lock_applied = 0;
12545         int nagle_applies = 0;
12546         int some_on_control = 0;
12547         int got_all_of_the_send = 0;
12548         int hold_tcblock = 0;
12549         int non_blocking = 0;
12550         uint32_t local_add_more;
12551         ssize_t local_soresv = 0;
12552         uint16_t port;
12553         uint16_t sinfo_flags;
12554         sctp_assoc_t sinfo_assoc_id;
12555
12556         error = 0;
12557         net = NULL;
12558         stcb = NULL;
12559         asoc = NULL;
12560
12561         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12562         if (inp == NULL) {
12563                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12564                 error = EINVAL;
12565                 if (i_pak) {
12566                         SCTP_RELEASE_PKT(i_pak);
12567                 }
12568                 return (error);
12569         }
12570         if ((uio == NULL) && (i_pak == NULL)) {
12571                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12572                 return (EINVAL);
12573         }
12574         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12575         atomic_add_int(&inp->total_sends, 1);
12576         if (uio) {
12577                 if (uio->uio_resid < 0) {
12578                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12579                         return (EINVAL);
12580                 }
12581                 sndlen = uio->uio_resid;
12582         } else {
12583                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12584                 sndlen = SCTP_HEADER_LEN(i_pak);
12585         }
12586         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zu\n",
12587             (void *)addr,
12588             sndlen);
12589         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12590             (inp->sctp_socket->so_qlimit)) {
12591                 /* The listener can NOT send */
12592                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12593                 error = ENOTCONN;
12594                 goto out_unlocked;
12595         }
12596         /**
12597          * Pre-screen address, if one is given the sin-len
12598          * must be set correctly!
12599          */
12600         if (addr) {
12601                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12602
12603                 switch (raddr->sa.sa_family) {
12604 #ifdef INET
12605                 case AF_INET:
12606                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12607                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12608                                 error = EINVAL;
12609                                 goto out_unlocked;
12610                         }
12611                         port = raddr->sin.sin_port;
12612                         break;
12613 #endif
12614 #ifdef INET6
12615                 case AF_INET6:
12616                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12617                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12618                                 error = EINVAL;
12619                                 goto out_unlocked;
12620                         }
12621                         port = raddr->sin6.sin6_port;
12622                         break;
12623 #endif
12624                 default:
12625                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12626                         error = EAFNOSUPPORT;
12627                         goto out_unlocked;
12628                 }
12629         } else
12630                 port = 0;
12631
12632         if (srcv) {
12633                 sinfo_flags = srcv->sinfo_flags;
12634                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12635                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12636                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12637                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12638                         error = EINVAL;
12639                         goto out_unlocked;
12640                 }
12641                 if (srcv->sinfo_flags)
12642                         SCTP_STAT_INCR(sctps_sends_with_flags);
12643         } else {
12644                 sinfo_flags = inp->def_send.sinfo_flags;
12645                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12646         }
12647         if (sinfo_flags & SCTP_SENDALL) {
12648                 /* its a sendall */
12649                 error = sctp_sendall(inp, uio, top, srcv);
12650                 top = NULL;
12651                 goto out_unlocked;
12652         }
12653         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12654                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12655                 error = EINVAL;
12656                 goto out_unlocked;
12657         }
12658         /* now we must find the assoc */
12659         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12660             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12661                 SCTP_INP_RLOCK(inp);
12662                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12663                 if (stcb) {
12664                         SCTP_TCB_LOCK(stcb);
12665                         hold_tcblock = 1;
12666                 }
12667                 SCTP_INP_RUNLOCK(inp);
12668         } else if (sinfo_assoc_id) {
12669                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12670                 if (stcb != NULL) {
12671                         hold_tcblock = 1;
12672                 }
12673         } else if (addr) {
12674                 /*-
12675                  * Since we did not use findep we must
12676                  * increment it, and if we don't find a tcb
12677                  * decrement it.
12678                  */
12679                 SCTP_INP_WLOCK(inp);
12680                 SCTP_INP_INCR_REF(inp);
12681                 SCTP_INP_WUNLOCK(inp);
12682                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12683                 if (stcb == NULL) {
12684                         SCTP_INP_WLOCK(inp);
12685                         SCTP_INP_DECR_REF(inp);
12686                         SCTP_INP_WUNLOCK(inp);
12687                 } else {
12688                         hold_tcblock = 1;
12689                 }
12690         }
12691         if ((stcb == NULL) && (addr)) {
12692                 /* Possible implicit send? */
12693                 SCTP_ASOC_CREATE_LOCK(inp);
12694                 create_lock_applied = 1;
12695                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12696                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12697                         /* Should I really unlock ? */
12698                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12699                         error = EINVAL;
12700                         goto out_unlocked;
12701
12702                 }
12703                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12704                     (addr->sa_family == AF_INET6)) {
12705                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12706                         error = EINVAL;
12707                         goto out_unlocked;
12708                 }
12709                 SCTP_INP_WLOCK(inp);
12710                 SCTP_INP_INCR_REF(inp);
12711                 SCTP_INP_WUNLOCK(inp);
12712                 /* With the lock applied look again */
12713                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12714                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12715                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12716                 }
12717                 if (stcb == NULL) {
12718                         SCTP_INP_WLOCK(inp);
12719                         SCTP_INP_DECR_REF(inp);
12720                         SCTP_INP_WUNLOCK(inp);
12721                 } else {
12722                         hold_tcblock = 1;
12723                 }
12724                 if (error) {
12725                         goto out_unlocked;
12726                 }
12727                 if (t_inp != inp) {
12728                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12729                         error = ENOTCONN;
12730                         goto out_unlocked;
12731                 }
12732         }
12733         if (stcb == NULL) {
12734                 if (addr == NULL) {
12735                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12736                         error = ENOENT;
12737                         goto out_unlocked;
12738                 } else {
12739                         /* We must go ahead and start the INIT process */
12740                         uint32_t vrf_id;
12741
12742                         if ((sinfo_flags & SCTP_ABORT) ||
12743                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12744                                 /*-
12745                                  * User asks to abort a non-existant assoc,
12746                                  * or EOF a non-existant assoc with no data
12747                                  */
12748                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12749                                 error = ENOENT;
12750                                 goto out_unlocked;
12751                         }
12752                         /* get an asoc/stcb struct */
12753                         vrf_id = inp->def_vrf_id;
12754 #ifdef INVARIANTS
12755                         if (create_lock_applied == 0) {
12756                                 panic("Error, should hold create lock and I don't?");
12757                         }
12758 #endif
12759                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12760                             inp->sctp_ep.pre_open_stream_count,
12761                             inp->sctp_ep.port,
12762                             p);
12763                         if (stcb == NULL) {
12764                                 /* Error is setup for us in the call */
12765                                 goto out_unlocked;
12766                         }
12767                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12768                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12769                                 /*
12770                                  * Set the connected flag so we can queue
12771                                  * data
12772                                  */
12773                                 soisconnecting(so);
12774                         }
12775                         hold_tcblock = 1;
12776                         if (create_lock_applied) {
12777                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12778                                 create_lock_applied = 0;
12779                         } else {
12780                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12781                         }
12782                         /*
12783                          * Turn on queue only flag to prevent data from
12784                          * being sent
12785                          */
12786                         queue_only = 1;
12787                         asoc = &stcb->asoc;
12788                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12789                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12790
12791                         /* initialize authentication params for the assoc */
12792                         sctp_initialize_auth_params(inp, stcb);
12793
12794                         if (control) {
12795                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12796                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12797                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12798                                         hold_tcblock = 0;
12799                                         stcb = NULL;
12800                                         goto out_unlocked;
12801                                 }
12802                         }
12803                         /* out with the INIT */
12804                         queue_only_for_init = 1;
12805                         /*-
12806                          * we may want to dig in after this call and adjust the MTU
12807                          * value. It defaulted to 1500 (constant) but the ro
12808                          * structure may now have an update and thus we may need to
12809                          * change it BEFORE we append the message.
12810                          */
12811                 }
12812         } else
12813                 asoc = &stcb->asoc;
12814         if (srcv == NULL)
12815                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12816         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12817                 if (addr)
12818                         net = sctp_findnet(stcb, addr);
12819                 else
12820                         net = NULL;
12821                 if ((net == NULL) ||
12822                     ((port != 0) && (port != stcb->rport))) {
12823                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12824                         error = EINVAL;
12825                         goto out_unlocked;
12826                 }
12827         } else {
12828                 if (stcb->asoc.alternate) {
12829                         net = stcb->asoc.alternate;
12830                 } else {
12831                         net = stcb->asoc.primary_destination;
12832                 }
12833         }
12834         atomic_add_int(&stcb->total_sends, 1);
12835         /* Keep the stcb from being freed under our feet */
12836         atomic_add_int(&asoc->refcnt, 1);
12837         free_cnt_applied = 1;
12838
12839         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12840                 if (sndlen > asoc->smallest_mtu) {
12841                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12842                         error = EMSGSIZE;
12843                         goto out_unlocked;
12844                 }
12845         }
12846         if (SCTP_SO_IS_NBIO(so)
12847             || (flags & MSG_NBIO)
12848             ) {
12849                 non_blocking = 1;
12850         }
12851         /* would we block? */
12852         if (non_blocking) {
12853                 ssize_t amount;
12854
12855                 if (hold_tcblock == 0) {
12856                         SCTP_TCB_LOCK(stcb);
12857                         hold_tcblock = 1;
12858                 }
12859                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12860                 if (user_marks_eor == 0) {
12861                         amount = sndlen;
12862                 } else {
12863                         amount = 1;
12864                 }
12865                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12866                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12867                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12868                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12869                                 error = EMSGSIZE;
12870                         else
12871                                 error = EWOULDBLOCK;
12872                         goto out_unlocked;
12873                 }
12874                 stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12875                 SCTP_TCB_UNLOCK(stcb);
12876                 hold_tcblock = 0;
12877         } else {
12878                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12879         }
12880         local_soresv = sndlen;
12881         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12882                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12883                 error = ECONNRESET;
12884                 goto out_unlocked;
12885         }
12886         if (create_lock_applied) {
12887                 SCTP_ASOC_CREATE_UNLOCK(inp);
12888                 create_lock_applied = 0;
12889         }
12890         /* Is the stream no. valid? */
12891         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12892                 /* Invalid stream number */
12893                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12894                 error = EINVAL;
12895                 goto out_unlocked;
12896         }
12897         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12898             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12899                 /*
12900                  * Can't queue any data while stream reset is underway.
12901                  */
12902                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12903                         error = EAGAIN;
12904                 } else {
12905                         error = EINVAL;
12906                 }
12907                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12908                 goto out_unlocked;
12909         }
12910         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12911             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12912                 queue_only = 1;
12913         }
12914         /* we are now done with all control */
12915         if (control) {
12916                 sctp_m_freem(control);
12917                 control = NULL;
12918         }
12919         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12920             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12921             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12922             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12923                 if (srcv->sinfo_flags & SCTP_ABORT) {
12924                         ;
12925                 } else {
12926                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12927                         error = ECONNRESET;
12928                         goto out_unlocked;
12929                 }
12930         }
12931         /* Ok, we will attempt a msgsnd :> */
12932         if (p) {
12933                 p->td_ru.ru_msgsnd++;
12934         }
12935         /* Are we aborting? */
12936         if (srcv->sinfo_flags & SCTP_ABORT) {
12937                 struct mbuf *mm;
12938                 ssize_t tot_demand, tot_out = 0, max_out;
12939
12940                 SCTP_STAT_INCR(sctps_sends_with_abort);
12941                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12942                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12943                         /* It has to be up before we abort */
12944                         /* how big is the user initiated abort? */
12945                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12946                         error = EINVAL;
12947                         goto out;
12948                 }
12949                 if (hold_tcblock) {
12950                         SCTP_TCB_UNLOCK(stcb);
12951                         hold_tcblock = 0;
12952                 }
12953                 if (top) {
12954                         struct mbuf *cntm = NULL;
12955
12956                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12957                         if (sndlen != 0) {
12958                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12959                                         tot_out += SCTP_BUF_LEN(cntm);
12960                                 }
12961                         }
12962                 } else {
12963                         /* Must fit in a MTU */
12964                         tot_out = sndlen;
12965                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12966                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12967                                 /* To big */
12968                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12969                                 error = EMSGSIZE;
12970                                 goto out;
12971                         }
12972                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
12973                 }
12974                 if (mm == NULL) {
12975                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12976                         error = ENOMEM;
12977                         goto out;
12978                 }
12979                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12980                 max_out -= sizeof(struct sctp_abort_msg);
12981                 if (tot_out > max_out) {
12982                         tot_out = max_out;
12983                 }
12984                 if (mm) {
12985                         struct sctp_paramhdr *ph;
12986
12987                         /* now move forward the data pointer */
12988                         ph = mtod(mm, struct sctp_paramhdr *);
12989                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12990                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12991                         ph++;
12992                         SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12993                         if (top == NULL) {
12994                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12995                                 if (error) {
12996                                         /*-
12997                                          * Here if we can't get his data we
12998                                          * still abort we just don't get to
12999                                          * send the users note :-0
13000                                          */
13001                                         sctp_m_freem(mm);
13002                                         mm = NULL;
13003                                 }
13004                         } else {
13005                                 if (sndlen != 0) {
13006                                         SCTP_BUF_NEXT(mm) = top;
13007                                 }
13008                         }
13009                 }
13010                 if (hold_tcblock == 0) {
13011                         SCTP_TCB_LOCK(stcb);
13012                 }
13013                 atomic_add_int(&stcb->asoc.refcnt, -1);
13014                 free_cnt_applied = 0;
13015                 /* release this lock, otherwise we hang on ourselves */
13016                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13017                 /* now relock the stcb so everything is sane */
13018                 hold_tcblock = 0;
13019                 stcb = NULL;
13020                 /*
13021                  * In this case top is already chained to mm avoid double
13022                  * free, since we free it below if top != NULL and driver
13023                  * would free it after sending the packet out
13024                  */
13025                 if (sndlen != 0) {
13026                         top = NULL;
13027                 }
13028                 goto out_unlocked;
13029         }
13030         /* Calculate the maximum we can send */
13031         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13032         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13033                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13034         } else {
13035                 max_len = 0;
13036         }
13037         if (hold_tcblock) {
13038                 SCTP_TCB_UNLOCK(stcb);
13039                 hold_tcblock = 0;
13040         }
13041         if (asoc->strmout == NULL) {
13042                 /* huh? software error */
13043                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13044                 error = EFAULT;
13045                 goto out_unlocked;
13046         }
13047
13048         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13049         if ((user_marks_eor == 0) &&
13050             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13051                 /* It will NEVER fit */
13052                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13053                 error = EMSGSIZE;
13054                 goto out_unlocked;
13055         }
13056         if ((uio == NULL) && user_marks_eor) {
13057                 /*-
13058                  * We do not support eeor mode for
13059                  * sending with mbuf chains (like sendfile).
13060                  */
13061                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13062                 error = EINVAL;
13063                 goto out_unlocked;
13064         }
13065
13066         if (user_marks_eor) {
13067                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13068         } else {
13069                 /*-
13070                  * For non-eeor the whole message must fit in
13071                  * the socket send buffer.
13072                  */
13073                 local_add_more = (uint32_t)sndlen;
13074         }
13075         len = 0;
13076         if (non_blocking) {
13077                 goto skip_preblock;
13078         }
13079         if (((max_len <= local_add_more) &&
13080             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13081             (max_len == 0) ||
13082             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13083                 /* No room right now ! */
13084                 SOCKBUF_LOCK(&so->so_snd);
13085                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13086                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13087                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13088                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13089                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13090                             inqueue_bytes,
13091                             local_add_more,
13092                             stcb->asoc.stream_queue_cnt,
13093                             stcb->asoc.chunks_on_out_queue,
13094                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13095                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13096                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13097                         }
13098                         be.error = 0;
13099                         stcb->block_entry = &be;
13100                         error = sbwait(&so->so_snd);
13101                         stcb->block_entry = NULL;
13102                         if (error || so->so_error || be.error) {
13103                                 if (error == 0) {
13104                                         if (so->so_error)
13105                                                 error = so->so_error;
13106                                         if (be.error) {
13107                                                 error = be.error;
13108                                         }
13109                                 }
13110                                 SOCKBUF_UNLOCK(&so->so_snd);
13111                                 goto out_unlocked;
13112                         }
13113                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13114                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13115                                     asoc, stcb->asoc.total_output_queue_size);
13116                         }
13117                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13118                                 SOCKBUF_UNLOCK(&so->so_snd);
13119                                 goto out_unlocked;
13120                         }
13121                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13122                 }
13123                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13124                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13125                 } else {
13126                         max_len = 0;
13127                 }
13128                 SOCKBUF_UNLOCK(&so->so_snd);
13129         }
13130
13131 skip_preblock:
13132         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13133                 goto out_unlocked;
13134         }
13135         /*
13136          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13137          * case NOTE: uio will be null when top/mbuf is passed
13138          */
13139         if (sndlen == 0) {
13140                 if (srcv->sinfo_flags & SCTP_EOF) {
13141                         got_all_of_the_send = 1;
13142                         goto dataless_eof;
13143                 } else {
13144                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13145                         error = EINVAL;
13146                         goto out;
13147                 }
13148         }
13149         if (top == NULL) {
13150                 struct sctp_stream_queue_pending *sp;
13151                 struct sctp_stream_out *strm;
13152                 uint32_t sndout;
13153
13154                 SCTP_TCB_SEND_LOCK(stcb);
13155                 if ((asoc->stream_locked) &&
13156                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13157                         SCTP_TCB_SEND_UNLOCK(stcb);
13158                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13159                         error = EINVAL;
13160                         goto out;
13161                 }
13162                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13163                 if (strm->last_msg_incomplete == 0) {
13164         do_a_copy_in:
13165                         SCTP_TCB_SEND_UNLOCK(stcb);
13166                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13167                         if (error) {
13168                                 goto out;
13169                         }
13170                         SCTP_TCB_SEND_LOCK(stcb);
13171                         if (sp->msg_is_complete) {
13172                                 strm->last_msg_incomplete = 0;
13173                                 asoc->stream_locked = 0;
13174                         } else {
13175                                 /*
13176                                  * Just got locked to this guy in case of an
13177                                  * interrupt.
13178                                  */
13179                                 strm->last_msg_incomplete = 1;
13180                                 if (stcb->asoc.idata_supported == 0) {
13181                                         asoc->stream_locked = 1;
13182                                         asoc->stream_locked_on = srcv->sinfo_stream;
13183                                 }
13184                                 sp->sender_all_done = 0;
13185                         }
13186                         sctp_snd_sb_alloc(stcb, sp->length);
13187                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13188                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13189                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13190                         }
13191                         sp->processing = 1;
13192                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13193                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13194                 } else {
13195                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13196                         if (sp == NULL) {
13197                                 /* ???? Huh ??? last msg is gone */
13198 #ifdef INVARIANTS
13199                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13200 #else
13201                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13202                                 strm->last_msg_incomplete = 0;
13203 #endif
13204                                 goto do_a_copy_in;
13205
13206                         }
13207                         if (sp->processing) {
13208                                 SCTP_TCB_SEND_UNLOCK(stcb);
13209                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13210                                 error = EINVAL;
13211                                 goto out;
13212                         } else {
13213                                 sp->processing = 1;
13214                         }
13215                 }
13216                 SCTP_TCB_SEND_UNLOCK(stcb);
13217                 while (uio->uio_resid > 0) {
13218                         /* How much room do we have? */
13219                         struct mbuf *new_tail, *mm;
13220
13221                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13222                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13223                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13224                         else
13225                                 max_len = 0;
13226
13227                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13228                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13229                             (uio->uio_resid && (uio->uio_resid <= max_len))) {
13230                                 sndout = 0;
13231                                 new_tail = NULL;
13232                                 if (hold_tcblock) {
13233                                         SCTP_TCB_UNLOCK(stcb);
13234                                         hold_tcblock = 0;
13235                                 }
13236                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13237                                 if ((mm == NULL) || error) {
13238                                         if (mm) {
13239                                                 sctp_m_freem(mm);
13240                                         }
13241                                         SCTP_TCB_SEND_LOCK(stcb);
13242                                         if (sp != NULL) {
13243                                                 sp->processing = 0;
13244                                         }
13245                                         SCTP_TCB_SEND_UNLOCK(stcb);
13246                                         goto out;
13247                                 }
13248                                 /* Update the mbuf and count */
13249                                 SCTP_TCB_SEND_LOCK(stcb);
13250                                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13251                                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13252                                         /*
13253                                          * we need to get out. Peer probably
13254                                          * aborted.
13255                                          */
13256                                         sctp_m_freem(mm);
13257                                         if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) {
13258                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13259                                                 error = ECONNRESET;
13260                                         }
13261                                         if (sp != NULL) {
13262                                                 sp->processing = 0;
13263                                         }
13264                                         SCTP_TCB_SEND_UNLOCK(stcb);
13265                                         goto out;
13266                                 }
13267                                 if (sp->tail_mbuf) {
13268                                         /* tack it to the end */
13269                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13270                                         sp->tail_mbuf = new_tail;
13271                                 } else {
13272                                         /* A stolen mbuf */
13273                                         sp->data = mm;
13274                                         sp->tail_mbuf = new_tail;
13275                                 }
13276                                 sctp_snd_sb_alloc(stcb, sndout);
13277                                 atomic_add_int(&sp->length, sndout);
13278                                 len += sndout;
13279                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13280                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13281                                 }
13282
13283                                 /* Did we reach EOR? */
13284                                 if ((uio->uio_resid == 0) &&
13285                                     ((user_marks_eor == 0) ||
13286                                     (srcv->sinfo_flags & SCTP_EOF) ||
13287                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13288                                         sp->msg_is_complete = 1;
13289                                 } else {
13290                                         sp->msg_is_complete = 0;
13291                                 }
13292                                 SCTP_TCB_SEND_UNLOCK(stcb);
13293                         }
13294                         if (uio->uio_resid == 0) {
13295                                 /* got it all? */
13296                                 continue;
13297                         }
13298                         /* PR-SCTP? */
13299                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13300                                 /*
13301                                  * This is ugly but we must assure locking
13302                                  * order
13303                                  */
13304                                 if (hold_tcblock == 0) {
13305                                         SCTP_TCB_LOCK(stcb);
13306                                         hold_tcblock = 1;
13307                                 }
13308                                 sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13309                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13310                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13311                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13312                                 else
13313                                         max_len = 0;
13314                                 if (max_len > 0) {
13315                                         continue;
13316                                 }
13317                                 SCTP_TCB_UNLOCK(stcb);
13318                                 hold_tcblock = 0;
13319                         }
13320                         /* wait for space now */
13321                         if (non_blocking) {
13322                                 /* Non-blocking io in place out */
13323                                 SCTP_TCB_SEND_LOCK(stcb);
13324                                 if (sp != NULL) {
13325                                         sp->processing = 0;
13326                                 }
13327                                 SCTP_TCB_SEND_UNLOCK(stcb);
13328                                 goto skip_out_eof;
13329                         }
13330                         /* What about the INIT, send it maybe */
13331                         if (queue_only_for_init) {
13332                                 if (hold_tcblock == 0) {
13333                                         SCTP_TCB_LOCK(stcb);
13334                                         hold_tcblock = 1;
13335                                 }
13336                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13337                                         /* a collision took us forward? */
13338                                         queue_only = 0;
13339                                 } else {
13340                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13341                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13342                                         queue_only = 1;
13343                                 }
13344                         }
13345                         if ((net->flight_size > net->cwnd) &&
13346                             (asoc->sctp_cmt_on_off == 0)) {
13347                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13348                                 queue_only = 1;
13349                         } else if (asoc->ifp_had_enobuf) {
13350                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13351                                 if (net->flight_size > (2 * net->mtu)) {
13352                                         queue_only = 1;
13353                                 }
13354                                 asoc->ifp_had_enobuf = 0;
13355                         }
13356                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13357                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13358                             (stcb->asoc.total_flight > 0) &&
13359                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13360                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13361
13362                                 /*-
13363                                  * Ok, Nagle is set on and we have data outstanding.
13364                                  * Don't send anything and let SACKs drive out the
13365                                  * data unless we have a "full" segment to send.
13366                                  */
13367                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13368                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13369                                 }
13370                                 SCTP_STAT_INCR(sctps_naglequeued);
13371                                 nagle_applies = 1;
13372                         } else {
13373                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13374                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13375                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13376                                 }
13377                                 SCTP_STAT_INCR(sctps_naglesent);
13378                                 nagle_applies = 0;
13379                         }
13380                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13381
13382                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13383                                     nagle_applies, un_sent);
13384                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13385                                     stcb->asoc.total_flight,
13386                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13387                         }
13388                         if (queue_only_for_init)
13389                                 queue_only_for_init = 0;
13390                         if ((queue_only == 0) && (nagle_applies == 0)) {
13391                                 /*-
13392                                  * need to start chunk output
13393                                  * before blocking.. note that if
13394                                  * a lock is already applied, then
13395                                  * the input via the net is happening
13396                                  * and I don't need to start output :-D
13397                                  */
13398                                 if (hold_tcblock == 0) {
13399                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13400                                                 hold_tcblock = 1;
13401                                                 sctp_chunk_output(inp,
13402                                                     stcb,
13403                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13404                                         }
13405                                 } else {
13406                                         sctp_chunk_output(inp,
13407                                             stcb,
13408                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13409                                 }
13410                                 if (hold_tcblock == 1) {
13411                                         SCTP_TCB_UNLOCK(stcb);
13412                                         hold_tcblock = 0;
13413                                 }
13414                         }
13415                         SOCKBUF_LOCK(&so->so_snd);
13416                         /*-
13417                          * This is a bit strange, but I think it will
13418                          * work. The total_output_queue_size is locked and
13419                          * protected by the TCB_LOCK, which we just released.
13420                          * There is a race that can occur between releasing it
13421                          * above, and me getting the socket lock, where sacks
13422                          * come in but we have not put the SB_WAIT on the
13423                          * so_snd buffer to get the wakeup. After the LOCK
13424                          * is applied the sack_processing will also need to
13425                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13426                          * once we have the socket buffer lock if we recheck the
13427                          * size we KNOW we will get to sleep safely with the
13428                          * wakeup flag in place.
13429                          */
13430                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13431                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13432                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13433                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13434                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13435                                             asoc, uio->uio_resid);
13436                                 }
13437                                 be.error = 0;
13438                                 stcb->block_entry = &be;
13439                                 error = sbwait(&so->so_snd);
13440                                 stcb->block_entry = NULL;
13441
13442                                 if (error || so->so_error || be.error) {
13443                                         if (error == 0) {
13444                                                 if (so->so_error)
13445                                                         error = so->so_error;
13446                                                 if (be.error) {
13447                                                         error = be.error;
13448                                                 }
13449                                         }
13450                                         SOCKBUF_UNLOCK(&so->so_snd);
13451                                         SCTP_TCB_SEND_LOCK(stcb);
13452                                         if (sp != NULL) {
13453                                                 sp->processing = 0;
13454                                         }
13455                                         SCTP_TCB_SEND_UNLOCK(stcb);
13456                                         goto out_unlocked;
13457                                 }
13458
13459                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13460                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13461                                             asoc, stcb->asoc.total_output_queue_size);
13462                                 }
13463                         }
13464                         SOCKBUF_UNLOCK(&so->so_snd);
13465                         SCTP_TCB_SEND_LOCK(stcb);
13466                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13467                                 if (sp != NULL) {
13468                                         sp->processing = 0;
13469                                 }
13470                                 SCTP_TCB_SEND_UNLOCK(stcb);
13471                                 goto out_unlocked;
13472                         }
13473                         SCTP_TCB_SEND_UNLOCK(stcb);
13474                 }
13475                 SCTP_TCB_SEND_LOCK(stcb);
13476                 if ((stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13477                     (stcb->asoc.state & SCTP_STATE_WAS_ABORTED)) {
13478                         SCTP_TCB_SEND_UNLOCK(stcb);
13479                         goto out_unlocked;
13480                 }
13481                 if (sp) {
13482                         if (sp->msg_is_complete == 0) {
13483                                 strm->last_msg_incomplete = 1;
13484                                 if (stcb->asoc.idata_supported == 0) {
13485                                         asoc->stream_locked = 1;
13486                                         asoc->stream_locked_on = srcv->sinfo_stream;
13487                                 }
13488                         } else {
13489                                 sp->sender_all_done = 1;
13490                                 strm->last_msg_incomplete = 0;
13491                                 asoc->stream_locked = 0;
13492                         }
13493                         sp->processing = 0;
13494                 } else {
13495                         SCTP_PRINTF("Huh no sp TSNH?\n");
13496                         strm->last_msg_incomplete = 0;
13497                         asoc->stream_locked = 0;
13498                 }
13499                 SCTP_TCB_SEND_UNLOCK(stcb);
13500                 if (uio->uio_resid == 0) {
13501                         got_all_of_the_send = 1;
13502                 }
13503         } else {
13504                 /* We send in a 0, since we do NOT have any locks */
13505                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13506                 top = NULL;
13507                 if (srcv->sinfo_flags & SCTP_EOF) {
13508                         /*
13509                          * This should only happen for Panda for the mbuf
13510                          * send case, which does NOT yet support EEOR mode.
13511                          * Thus, we can just set this flag to do the proper
13512                          * EOF handling.
13513                          */
13514                         got_all_of_the_send = 1;
13515                 }
13516         }
13517         if (error) {
13518                 goto out;
13519         }
13520 dataless_eof:
13521         /* EOF thing ? */
13522         if ((srcv->sinfo_flags & SCTP_EOF) &&
13523             (got_all_of_the_send == 1)) {
13524                 SCTP_STAT_INCR(sctps_sends_with_eof);
13525                 error = 0;
13526                 if (hold_tcblock == 0) {
13527                         SCTP_TCB_LOCK(stcb);
13528                         hold_tcblock = 1;
13529                 }
13530                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13531                     TAILQ_EMPTY(&asoc->sent_queue) &&
13532                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13533                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13534                                 goto abort_anyway;
13535                         }
13536                         /* there is nothing queued to send, so I'm done... */
13537                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13538                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13539                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13540                                 struct sctp_nets *netp;
13541
13542                                 /* only send SHUTDOWN the first time through */
13543                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13544                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13545                                 }
13546                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13547                                 SCTP_CLEAR_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13548                                 sctp_stop_timers_for_shutdown(stcb);
13549                                 if (stcb->asoc.alternate) {
13550                                         netp = stcb->asoc.alternate;
13551                                 } else {
13552                                         netp = stcb->asoc.primary_destination;
13553                                 }
13554                                 sctp_send_shutdown(stcb, netp);
13555                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13556                                     netp);
13557                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13558                                     asoc->primary_destination);
13559                         }
13560                 } else {
13561                         /*-
13562                          * we still got (or just got) data to send, so set
13563                          * SHUTDOWN_PENDING
13564                          */
13565                         /*-
13566                          * XXX sockets draft says that SCTP_EOF should be
13567                          * sent with no data.  currently, we will allow user
13568                          * data to be sent first and move to
13569                          * SHUTDOWN-PENDING
13570                          */
13571                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13572                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13573                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13574                                 if (hold_tcblock == 0) {
13575                                         SCTP_TCB_LOCK(stcb);
13576                                         hold_tcblock = 1;
13577                                 }
13578                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13579                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13580                                 }
13581                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13582                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13583                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13584                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13585                                         struct mbuf *op_err;
13586                                         char msg[SCTP_DIAG_INFO_LEN];
13587
13588                         abort_anyway:
13589                                         if (free_cnt_applied) {
13590                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13591                                                 free_cnt_applied = 0;
13592                                         }
13593                                         snprintf(msg, sizeof(msg),
13594                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13595                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13596                                             msg);
13597                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13598                                             op_err, SCTP_SO_LOCKED);
13599                                         /*
13600                                          * now relock the stcb so everything
13601                                          * is sane
13602                                          */
13603                                         hold_tcblock = 0;
13604                                         stcb = NULL;
13605                                         goto out;
13606                                 }
13607                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13608                                     asoc->primary_destination);
13609                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13610                         }
13611                 }
13612         }
13613 skip_out_eof:
13614         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13615                 some_on_control = 1;
13616         }
13617         if (queue_only_for_init) {
13618                 if (hold_tcblock == 0) {
13619                         SCTP_TCB_LOCK(stcb);
13620                         hold_tcblock = 1;
13621                 }
13622                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13623                         /* a collision took us forward? */
13624                         queue_only = 0;
13625                 } else {
13626                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13627                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13628                         queue_only = 1;
13629                 }
13630         }
13631         if ((net->flight_size > net->cwnd) &&
13632             (stcb->asoc.sctp_cmt_on_off == 0)) {
13633                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13634                 queue_only = 1;
13635         } else if (asoc->ifp_had_enobuf) {
13636                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13637                 if (net->flight_size > (2 * net->mtu)) {
13638                         queue_only = 1;
13639                 }
13640                 asoc->ifp_had_enobuf = 0;
13641         }
13642         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13643         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13644             (stcb->asoc.total_flight > 0) &&
13645             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13646             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13647                 /*-
13648                  * Ok, Nagle is set on and we have data outstanding.
13649                  * Don't send anything and let SACKs drive out the
13650                  * data unless wen have a "full" segment to send.
13651                  */
13652                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13653                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13654                 }
13655                 SCTP_STAT_INCR(sctps_naglequeued);
13656                 nagle_applies = 1;
13657         } else {
13658                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13659                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13660                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13661                 }
13662                 SCTP_STAT_INCR(sctps_naglesent);
13663                 nagle_applies = 0;
13664         }
13665         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13666                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13667                     nagle_applies, un_sent);
13668                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13669                     stcb->asoc.total_flight,
13670                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13671         }
13672         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13673                 /* we can attempt to send too. */
13674                 if (hold_tcblock == 0) {
13675                         /*
13676                          * If there is activity recv'ing sacks no need to
13677                          * send
13678                          */
13679                         if (SCTP_TCB_TRYLOCK(stcb)) {
13680                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13681                                 hold_tcblock = 1;
13682                         }
13683                 } else {
13684                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13685                 }
13686         } else if ((queue_only == 0) &&
13687                     (stcb->asoc.peers_rwnd == 0) &&
13688             (stcb->asoc.total_flight == 0)) {
13689                 /* We get to have a probe outstanding */
13690                 if (hold_tcblock == 0) {
13691                         hold_tcblock = 1;
13692                         SCTP_TCB_LOCK(stcb);
13693                 }
13694                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13695         } else if (some_on_control) {
13696                 int num_out, reason, frag_point;
13697
13698                 /* Here we do control only */
13699                 if (hold_tcblock == 0) {
13700                         hold_tcblock = 1;
13701                         SCTP_TCB_LOCK(stcb);
13702                 }
13703                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13704                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13705                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13706         }
13707         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13708             queue_only, stcb->asoc.peers_rwnd, un_sent,
13709             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13710             stcb->asoc.total_output_queue_size, error);
13711
13712 out:
13713 out_unlocked:
13714
13715         if (local_soresv && stcb) {
13716                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13717         }
13718         if (create_lock_applied) {
13719                 SCTP_ASOC_CREATE_UNLOCK(inp);
13720         }
13721         if ((stcb) && hold_tcblock) {
13722                 SCTP_TCB_UNLOCK(stcb);
13723         }
13724         if (stcb && free_cnt_applied) {
13725                 atomic_add_int(&stcb->asoc.refcnt, -1);
13726         }
13727 #ifdef INVARIANTS
13728         if (stcb) {
13729                 if (mtx_owned(&stcb->tcb_mtx)) {
13730                         panic("Leaving with tcb mtx owned?");
13731                 }
13732                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13733                         panic("Leaving with tcb send mtx owned?");
13734                 }
13735         }
13736 #endif
13737         if (top) {
13738                 sctp_m_freem(top);
13739         }
13740         if (control) {
13741                 sctp_m_freem(control);
13742         }
13743         return (error);
13744 }
13745
13746
13747 /*
13748  * generate an AUTHentication chunk, if required
13749  */
13750 struct mbuf *
13751 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13752     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13753     struct sctp_tcb *stcb, uint8_t chunk)
13754 {
13755         struct mbuf *m_auth;
13756         struct sctp_auth_chunk *auth;
13757         int chunk_len;
13758         struct mbuf *cn;
13759
13760         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13761             (stcb == NULL))
13762                 return (m);
13763
13764         if (stcb->asoc.auth_supported == 0) {
13765                 return (m);
13766         }
13767         /* does the requested chunk require auth? */
13768         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13769                 return (m);
13770         }
13771         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13772         if (m_auth == NULL) {
13773                 /* no mbuf's */
13774                 return (m);
13775         }
13776         /* reserve some space if this will be the first mbuf */
13777         if (m == NULL)
13778                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13779         /* fill in the AUTH chunk details */
13780         auth = mtod(m_auth, struct sctp_auth_chunk *);
13781         memset(auth, 0, sizeof(*auth));
13782         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13783         auth->ch.chunk_flags = 0;
13784         chunk_len = sizeof(*auth) +
13785             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13786         auth->ch.chunk_length = htons(chunk_len);
13787         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13788         /* key id and hmac digest will be computed and filled in upon send */
13789
13790         /* save the offset where the auth was inserted into the chain */
13791         *offset = 0;
13792         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13793                 *offset += SCTP_BUF_LEN(cn);
13794         }
13795
13796         /* update length and return pointer to the auth chunk */
13797         SCTP_BUF_LEN(m_auth) = chunk_len;
13798         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13799         if (auth_ret != NULL)
13800                 *auth_ret = auth;
13801
13802         return (m);
13803 }
13804
13805 #ifdef INET6
13806 int
13807 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13808 {
13809         struct nd_prefix *pfx = NULL;
13810         struct nd_pfxrouter *pfxrtr = NULL;
13811         struct sockaddr_in6 gw6;
13812
13813         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13814                 return (0);
13815
13816         /* get prefix entry of address */
13817         ND6_RLOCK();
13818         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13819                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13820                         continue;
13821                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13822                     &src6->sin6_addr, &pfx->ndpr_mask))
13823                         break;
13824         }
13825         /* no prefix entry in the prefix list */
13826         if (pfx == NULL) {
13827                 ND6_RUNLOCK();
13828                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13829                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13830                 return (0);
13831         }
13832
13833         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13834         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13835
13836         /* search installed gateway from prefix entry */
13837         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13838                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13839                 gw6.sin6_family = AF_INET6;
13840                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13841                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13842                     sizeof(struct in6_addr));
13843                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13844                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13845                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13846                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13847                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13848                         ND6_RUNLOCK();
13849                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13850                         ND6_RUNLOCK();
13851                         return (1);
13852                 }
13853         }
13854         ND6_RUNLOCK();
13855         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13856         return (0);
13857 }
13858 #endif
13859
13860 int
13861 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13862 {
13863 #ifdef INET
13864         struct sockaddr_in *sin, *mask;
13865         struct ifaddr *ifa;
13866         struct in_addr srcnetaddr, gwnetaddr;
13867
13868         if (ro == NULL || ro->ro_rt == NULL ||
13869             sifa->address.sa.sa_family != AF_INET) {
13870                 return (0);
13871         }
13872         ifa = (struct ifaddr *)sifa->ifa;
13873         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13874         sin = &sifa->address.sin;
13875         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13876         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13877         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13878         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13879
13880         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13881         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13882         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13883         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13884         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13885         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13886                 return (1);
13887         }
13888 #endif
13889         return (0);
13890 }