sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 const struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *parmh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946
1947 #endif
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963 #if defined(INET) || defined(INET6)
1964         if (M_TRAILINGSPACE(m) >= plen) {
1965                 /* easy side we just drop it on the end */
1966                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967                 mret = m;
1968         } else {
1969                 /* Need more space */
1970                 mret = m;
1971                 while (SCTP_BUF_NEXT(mret) != NULL) {
1972                         mret = SCTP_BUF_NEXT(mret);
1973                 }
1974                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1975                 if (SCTP_BUF_NEXT(mret) == NULL) {
1976                         /* We are hosed, can't add more addresses */
1977                         return (m);
1978                 }
1979                 mret = SCTP_BUF_NEXT(mret);
1980                 parmh = mtod(mret, struct sctp_paramhdr *);
1981         }
1982         /* now add the parameter */
1983         switch (ifa->address.sa.sa_family) {
1984 #ifdef INET
1985         case AF_INET:
1986                 {
1987                         struct sctp_ipv4addr_param *ipv4p;
1988                         struct sockaddr_in *sin;
1989
1990                         sin = &ifa->address.sin;
1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993                         parmh->param_length = htons(plen);
1994                         ipv4p->addr = sin->sin_addr.s_addr;
1995                         SCTP_BUF_LEN(mret) += plen;
1996                         break;
1997                 }
1998 #endif
1999 #ifdef INET6
2000         case AF_INET6:
2001                 {
2002                         struct sctp_ipv6addr_param *ipv6p;
2003                         struct sockaddr_in6 *sin6;
2004
2005                         sin6 = &ifa->address.sin6;
2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008                         parmh->param_length = htons(plen);
2009                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2010                             sizeof(ipv6p->addr));
2011                         /* clear embedded scope in the address */
2012                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2013                         SCTP_BUF_LEN(mret) += plen;
2014                         break;
2015                 }
2016 #endif
2017         default:
2018                 return (m);
2019         }
2020         if (len != NULL) {
2021                 *len += plen;
2022         }
2023         return (mret);
2024 #endif
2025 }
2026
2027
2028 struct mbuf *
2029 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2030     struct sctp_scoping *scope,
2031     struct mbuf *m_at, int cnt_inits_to,
2032     uint16_t * padding_len, uint16_t * chunk_len)
2033 {
2034         struct sctp_vrf *vrf = NULL;
2035         int cnt, limit_out = 0, total_count;
2036         uint32_t vrf_id;
2037
2038         vrf_id = inp->def_vrf_id;
2039         SCTP_IPI_ADDR_RLOCK();
2040         vrf = sctp_find_vrf(vrf_id);
2041         if (vrf == NULL) {
2042                 SCTP_IPI_ADDR_RUNLOCK();
2043                 return (m_at);
2044         }
2045         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2046                 struct sctp_ifa *sctp_ifap;
2047                 struct sctp_ifn *sctp_ifnp;
2048
2049                 cnt = cnt_inits_to;
2050                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2051                         limit_out = 1;
2052                         cnt = SCTP_ADDRESS_LIMIT;
2053                         goto skip_count;
2054                 }
2055                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2056                         if ((scope->loopback_scope == 0) &&
2057                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2058                                 /*
2059                                  * Skip loopback devices if loopback_scope
2060                                  * not set
2061                                  */
2062                                 continue;
2063                         }
2064                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2065 #ifdef INET
2066                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2067                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2068                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2069                                         continue;
2070                                 }
2071 #endif
2072 #ifdef INET6
2073                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2074                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2075                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2076                                         continue;
2077                                 }
2078 #endif
2079                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2080                                         continue;
2081                                 }
2082                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2083                                         continue;
2084                                 }
2085                                 cnt++;
2086                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2087                                         break;
2088                                 }
2089                         }
2090                         if (cnt > SCTP_ADDRESS_LIMIT) {
2091                                 break;
2092                         }
2093                 }
2094 skip_count:
2095                 if (cnt > 1) {
2096                         total_count = 0;
2097                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2098                                 cnt = 0;
2099                                 if ((scope->loopback_scope == 0) &&
2100                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2101                                         /*
2102                                          * Skip loopback devices if
2103                                          * loopback_scope not set
2104                                          */
2105                                         continue;
2106                                 }
2107                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2108 #ifdef INET
2109                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2110                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2111                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2112                                                 continue;
2113                                         }
2114 #endif
2115 #ifdef INET6
2116                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2117                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2118                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2119                                                 continue;
2120                                         }
2121 #endif
2122                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2123                                                 continue;
2124                                         }
2125                                         if (sctp_is_address_in_scope(sctp_ifap,
2126                                             scope, 0) == 0) {
2127                                                 continue;
2128                                         }
2129                                         if ((chunk_len != NULL) &&
2130                                             (padding_len != NULL) &&
2131                                             (*padding_len > 0)) {
2132                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2133                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2134                                                 *chunk_len += *padding_len;
2135                                                 *padding_len = 0;
2136                                         }
2137                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2138                                         if (limit_out) {
2139                                                 cnt++;
2140                                                 total_count++;
2141                                                 if (cnt >= 2) {
2142                                                         /*
2143                                                          * two from each
2144                                                          * address
2145                                                          */
2146                                                         break;
2147                                                 }
2148                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2149                                                         /* No more addresses */
2150                                                         break;
2151                                                 }
2152                                         }
2153                                 }
2154                         }
2155                 }
2156         } else {
2157                 struct sctp_laddr *laddr;
2158
2159                 cnt = cnt_inits_to;
2160                 /* First, how many ? */
2161                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162                         if (laddr->ifa == NULL) {
2163                                 continue;
2164                         }
2165                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2166                                 /*
2167                                  * Address being deleted by the system, dont
2168                                  * list.
2169                                  */
2170                                 continue;
2171                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2172                                 /*
2173                                  * Address being deleted on this ep don't
2174                                  * list.
2175                                  */
2176                                 continue;
2177                         }
2178                         if (sctp_is_address_in_scope(laddr->ifa,
2179                             scope, 1) == 0) {
2180                                 continue;
2181                         }
2182                         cnt++;
2183                 }
2184                 /*
2185                  * To get through a NAT we only list addresses if we have
2186                  * more than one. That way if you just bind a single address
2187                  * we let the source of the init dictate our address.
2188                  */
2189                 if (cnt > 1) {
2190                         cnt = cnt_inits_to;
2191                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2192                                 if (laddr->ifa == NULL) {
2193                                         continue;
2194                                 }
2195                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2196                                         continue;
2197                                 }
2198                                 if (sctp_is_address_in_scope(laddr->ifa,
2199                                     scope, 0) == 0) {
2200                                         continue;
2201                                 }
2202                                 if ((chunk_len != NULL) &&
2203                                     (padding_len != NULL) &&
2204                                     (*padding_len > 0)) {
2205                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2206                                         SCTP_BUF_LEN(m_at) += *padding_len;
2207                                         *chunk_len += *padding_len;
2208                                         *padding_len = 0;
2209                                 }
2210                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2211                                 cnt++;
2212                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2213                                         break;
2214                                 }
2215                         }
2216                 }
2217         }
2218         SCTP_IPI_ADDR_RUNLOCK();
2219         return (m_at);
2220 }
2221
2222 static struct sctp_ifa *
2223 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2224     uint8_t dest_is_loop,
2225     uint8_t dest_is_priv,
2226     sa_family_t fam)
2227 {
2228         uint8_t dest_is_global = 0;
2229
2230         /* dest_is_priv is true if destination is a private address */
2231         /* dest_is_loop is true if destination is a loopback addresses */
2232
2233         /**
2234          * Here we determine if its a preferred address. A preferred address
2235          * means it is the same scope or higher scope then the destination.
2236          * L = loopback, P = private, G = global
2237          * -----------------------------------------
2238          *    src    |  dest | result
2239          *  ----------------------------------------
2240          *     L     |    L  |    yes
2241          *  -----------------------------------------
2242          *     P     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     G     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     L     |    P  |    no
2247          *  -----------------------------------------
2248          *     P     |    P  |    yes
2249          *  -----------------------------------------
2250          *     G     |    P  |    no
2251          *   -----------------------------------------
2252          *     L     |    G  |    no
2253          *   -----------------------------------------
2254          *     P     |    G  |    no
2255          *    -----------------------------------------
2256          *     G     |    G  |    yes
2257          *    -----------------------------------------
2258          */
2259
2260         if (ifa->address.sa.sa_family != fam) {
2261                 /* forget mis-matched family */
2262                 return (NULL);
2263         }
2264         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2265                 dest_is_global = 1;
2266         }
2267         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2268         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2269         /* Ok the address may be ok */
2270 #ifdef INET6
2271         if (fam == AF_INET6) {
2272                 /* ok to use deprecated addresses? no lets not! */
2273                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2274                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2275                         return (NULL);
2276                 }
2277                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2278                         if (dest_is_loop) {
2279                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2280                                 return (NULL);
2281                         }
2282                 }
2283                 if (ifa->src_is_glob) {
2284                         if (dest_is_loop) {
2285                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2286                                 return (NULL);
2287                         }
2288                 }
2289         }
2290 #endif
2291         /*
2292          * Now that we know what is what, implement or table this could in
2293          * theory be done slicker (it used to be), but this is
2294          * straightforward and easier to validate :-)
2295          */
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2297             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2299             dest_is_loop, dest_is_priv, dest_is_global);
2300
2301         if ((ifa->src_is_loop) && (dest_is_priv)) {
2302                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2303                 return (NULL);
2304         }
2305         if ((ifa->src_is_glob) && (dest_is_priv)) {
2306                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2307                 return (NULL);
2308         }
2309         if ((ifa->src_is_loop) && (dest_is_global)) {
2310                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2311                 return (NULL);
2312         }
2313         if ((ifa->src_is_priv) && (dest_is_global)) {
2314                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2315                 return (NULL);
2316         }
2317         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2318         /* its a preferred address */
2319         return (ifa);
2320 }
2321
2322 static struct sctp_ifa *
2323 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2324     uint8_t dest_is_loop,
2325     uint8_t dest_is_priv,
2326     sa_family_t fam)
2327 {
2328         uint8_t dest_is_global = 0;
2329
2330         /**
2331          * Here we determine if its a acceptable address. A acceptable
2332          * address means it is the same scope or higher scope but we can
2333          * allow for NAT which means its ok to have a global dest and a
2334          * private src.
2335          *
2336          * L = loopback, P = private, G = global
2337          * -----------------------------------------
2338          *  src    |  dest | result
2339          * -----------------------------------------
2340          *   L     |   L   |    yes
2341          *  -----------------------------------------
2342          *   P     |   L   |    yes-v4 no-v6
2343          *  -----------------------------------------
2344          *   G     |   L   |    yes
2345          * -----------------------------------------
2346          *   L     |   P   |    no
2347          * -----------------------------------------
2348          *   P     |   P   |    yes
2349          * -----------------------------------------
2350          *   G     |   P   |    yes - May not work
2351          * -----------------------------------------
2352          *   L     |   G   |    no
2353          * -----------------------------------------
2354          *   P     |   G   |    yes - May not work
2355          * -----------------------------------------
2356          *   G     |   G   |    yes
2357          * -----------------------------------------
2358          */
2359
2360         if (ifa->address.sa.sa_family != fam) {
2361                 /* forget non matching family */
2362                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2363                     ifa->address.sa.sa_family, fam);
2364                 return (NULL);
2365         }
2366         /* Ok the address may be ok */
2367         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2369             dest_is_loop, dest_is_priv);
2370         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2371                 dest_is_global = 1;
2372         }
2373 #ifdef INET6
2374         if (fam == AF_INET6) {
2375                 /* ok to use deprecated addresses? */
2376                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2377                         return (NULL);
2378                 }
2379                 if (ifa->src_is_priv) {
2380                         /* Special case, linklocal to loop */
2381                         if (dest_is_loop)
2382                                 return (NULL);
2383                 }
2384         }
2385 #endif
2386         /*
2387          * Now that we know what is what, implement our table. This could in
2388          * theory be done slicker (it used to be), but this is
2389          * straightforward and easier to validate :-)
2390          */
2391         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2392             ifa->src_is_loop,
2393             dest_is_priv);
2394         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2395                 return (NULL);
2396         }
2397         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2398             ifa->src_is_loop,
2399             dest_is_global);
2400         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2401                 return (NULL);
2402         }
2403         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2404         /* its an acceptable address */
2405         return (ifa);
2406 }
2407
2408 int
2409 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2410 {
2411         struct sctp_laddr *laddr;
2412
2413         if (stcb == NULL) {
2414                 /* There are no restrictions, no TCB :-) */
2415                 return (0);
2416         }
2417         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2418                 if (laddr->ifa == NULL) {
2419                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2420                             __func__);
2421                         continue;
2422                 }
2423                 if (laddr->ifa == ifa) {
2424                         /* Yes it is on the list */
2425                         return (1);
2426                 }
2427         }
2428         return (0);
2429 }
2430
2431
2432 int
2433 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2434 {
2435         struct sctp_laddr *laddr;
2436
2437         if (ifa == NULL)
2438                 return (0);
2439         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2440                 if (laddr->ifa == NULL) {
2441                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2442                             __func__);
2443                         continue;
2444                 }
2445                 if ((laddr->ifa == ifa) && laddr->action == 0)
2446                         /* same pointer */
2447                         return (1);
2448         }
2449         return (0);
2450 }
2451
2452
2453
2454 static struct sctp_ifa *
2455 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2456     sctp_route_t * ro,
2457     uint32_t vrf_id,
2458     int non_asoc_addr_ok,
2459     uint8_t dest_is_priv,
2460     uint8_t dest_is_loop,
2461     sa_family_t fam)
2462 {
2463         struct sctp_laddr *laddr, *starting_point;
2464         void *ifn;
2465         int resettotop = 0;
2466         struct sctp_ifn *sctp_ifn;
2467         struct sctp_ifa *sctp_ifa, *sifa;
2468         struct sctp_vrf *vrf;
2469         uint32_t ifn_index;
2470
2471         vrf = sctp_find_vrf(vrf_id);
2472         if (vrf == NULL)
2473                 return (NULL);
2474
2475         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2476         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2477         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2478         /*
2479          * first question, is the ifn we will emit on in our list, if so, we
2480          * want such an address. Note that we first looked for a preferred
2481          * address.
2482          */
2483         if (sctp_ifn) {
2484                 /* is a preferred one on the interface we route out? */
2485                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2486 #ifdef INET
2487                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2488                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2489                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2490                                 continue;
2491                         }
2492 #endif
2493 #ifdef INET6
2494                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2495                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2496                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2497                                 continue;
2498                         }
2499 #endif
2500                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2501                             (non_asoc_addr_ok == 0))
2502                                 continue;
2503                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2504                             dest_is_loop,
2505                             dest_is_priv, fam);
2506                         if (sifa == NULL)
2507                                 continue;
2508                         if (sctp_is_addr_in_ep(inp, sifa)) {
2509                                 atomic_add_int(&sifa->refcount, 1);
2510                                 return (sifa);
2511                         }
2512                 }
2513         }
2514         /*
2515          * ok, now we now need to find one on the list of the addresses. We
2516          * can't get one on the emitting interface so let's find first a
2517          * preferred one. If not that an acceptable one otherwise... we
2518          * return NULL.
2519          */
2520         starting_point = inp->next_addr_touse;
2521 once_again:
2522         if (inp->next_addr_touse == NULL) {
2523                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2524                 resettotop = 1;
2525         }
2526         for (laddr = inp->next_addr_touse; laddr;
2527             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2528                 if (laddr->ifa == NULL) {
2529                         /* address has been removed */
2530                         continue;
2531                 }
2532                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2533                         /* address is being deleted */
2534                         continue;
2535                 }
2536                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2537                     dest_is_priv, fam);
2538                 if (sifa == NULL)
2539                         continue;
2540                 atomic_add_int(&sifa->refcount, 1);
2541                 return (sifa);
2542         }
2543         if (resettotop == 0) {
2544                 inp->next_addr_touse = NULL;
2545                 goto once_again;
2546         }
2547         inp->next_addr_touse = starting_point;
2548         resettotop = 0;
2549 once_again_too:
2550         if (inp->next_addr_touse == NULL) {
2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552                 resettotop = 1;
2553         }
2554         /* ok, what about an acceptable address in the inp */
2555         for (laddr = inp->next_addr_touse; laddr;
2556             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2557                 if (laddr->ifa == NULL) {
2558                         /* address has been removed */
2559                         continue;
2560                 }
2561                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2562                         /* address is being deleted */
2563                         continue;
2564                 }
2565                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2566                     dest_is_priv, fam);
2567                 if (sifa == NULL)
2568                         continue;
2569                 atomic_add_int(&sifa->refcount, 1);
2570                 return (sifa);
2571         }
2572         if (resettotop == 0) {
2573                 inp->next_addr_touse = NULL;
2574                 goto once_again_too;
2575         }
2576         /*
2577          * no address bound can be a source for the destination we are in
2578          * trouble
2579          */
2580         return (NULL);
2581 }
2582
2583
2584
2585 static struct sctp_ifa *
2586 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2587     struct sctp_tcb *stcb,
2588     sctp_route_t * ro,
2589     uint32_t vrf_id,
2590     uint8_t dest_is_priv,
2591     uint8_t dest_is_loop,
2592     int non_asoc_addr_ok,
2593     sa_family_t fam)
2594 {
2595         struct sctp_laddr *laddr, *starting_point;
2596         void *ifn;
2597         struct sctp_ifn *sctp_ifn;
2598         struct sctp_ifa *sctp_ifa, *sifa;
2599         uint8_t start_at_beginning = 0;
2600         struct sctp_vrf *vrf;
2601         uint32_t ifn_index;
2602
2603         /*
2604          * first question, is the ifn we will emit on in our list, if so, we
2605          * want that one.
2606          */
2607         vrf = sctp_find_vrf(vrf_id);
2608         if (vrf == NULL)
2609                 return (NULL);
2610
2611         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2612         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2613         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2614
2615         /*
2616          * first question, is the ifn we will emit on in our list?  If so,
2617          * we want that one. First we look for a preferred. Second, we go
2618          * for an acceptable.
2619          */
2620         if (sctp_ifn) {
2621                 /* first try for a preferred address on the ep */
2622                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2623 #ifdef INET
2624                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2625                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2626                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2627                                 continue;
2628                         }
2629 #endif
2630 #ifdef INET6
2631                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2632                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2633                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2634                                 continue;
2635                         }
2636 #endif
2637                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2638                                 continue;
2639                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2640                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2641                                 if (sifa == NULL)
2642                                         continue;
2643                                 if (((non_asoc_addr_ok == 0) &&
2644                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2645                                     (non_asoc_addr_ok &&
2646                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2647                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2648                                         /* on the no-no list */
2649                                         continue;
2650                                 }
2651                                 atomic_add_int(&sifa->refcount, 1);
2652                                 return (sifa);
2653                         }
2654                 }
2655                 /* next try for an acceptable address on the ep */
2656                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2657 #ifdef INET
2658                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2659                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2660                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2661                                 continue;
2662                         }
2663 #endif
2664 #ifdef INET6
2665                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2666                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2667                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2668                                 continue;
2669                         }
2670 #endif
2671                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2672                                 continue;
2673                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2674                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2675                                 if (sifa == NULL)
2676                                         continue;
2677                                 if (((non_asoc_addr_ok == 0) &&
2678                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                                     (non_asoc_addr_ok &&
2680                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                                         /* on the no-no list */
2683                                         continue;
2684                                 }
2685                                 atomic_add_int(&sifa->refcount, 1);
2686                                 return (sifa);
2687                         }
2688                 }
2689
2690         }
2691         /*
2692          * if we can't find one like that then we must look at all addresses
2693          * bound to pick one at first preferable then secondly acceptable.
2694          */
2695         starting_point = stcb->asoc.last_used_address;
2696 sctp_from_the_top:
2697         if (stcb->asoc.last_used_address == NULL) {
2698                 start_at_beginning = 1;
2699                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2700         }
2701         /* search beginning with the last used address */
2702         for (laddr = stcb->asoc.last_used_address; laddr;
2703             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2704                 if (laddr->ifa == NULL) {
2705                         /* address has been removed */
2706                         continue;
2707                 }
2708                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2709                         /* address is being deleted */
2710                         continue;
2711                 }
2712                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2713                 if (sifa == NULL)
2714                         continue;
2715                 if (((non_asoc_addr_ok == 0) &&
2716                     (sctp_is_addr_restricted(stcb, sifa))) ||
2717                     (non_asoc_addr_ok &&
2718                     (sctp_is_addr_restricted(stcb, sifa)) &&
2719                     (!sctp_is_addr_pending(stcb, sifa)))) {
2720                         /* on the no-no list */
2721                         continue;
2722                 }
2723                 stcb->asoc.last_used_address = laddr;
2724                 atomic_add_int(&sifa->refcount, 1);
2725                 return (sifa);
2726         }
2727         if (start_at_beginning == 0) {
2728                 stcb->asoc.last_used_address = NULL;
2729                 goto sctp_from_the_top;
2730         }
2731         /* now try for any higher scope than the destination */
2732         stcb->asoc.last_used_address = starting_point;
2733         start_at_beginning = 0;
2734 sctp_from_the_top2:
2735         if (stcb->asoc.last_used_address == NULL) {
2736                 start_at_beginning = 1;
2737                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2738         }
2739         /* search beginning with the last used address */
2740         for (laddr = stcb->asoc.last_used_address; laddr;
2741             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2742                 if (laddr->ifa == NULL) {
2743                         /* address has been removed */
2744                         continue;
2745                 }
2746                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2747                         /* address is being deleted */
2748                         continue;
2749                 }
2750                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2751                     dest_is_priv, fam);
2752                 if (sifa == NULL)
2753                         continue;
2754                 if (((non_asoc_addr_ok == 0) &&
2755                     (sctp_is_addr_restricted(stcb, sifa))) ||
2756                     (non_asoc_addr_ok &&
2757                     (sctp_is_addr_restricted(stcb, sifa)) &&
2758                     (!sctp_is_addr_pending(stcb, sifa)))) {
2759                         /* on the no-no list */
2760                         continue;
2761                 }
2762                 stcb->asoc.last_used_address = laddr;
2763                 atomic_add_int(&sifa->refcount, 1);
2764                 return (sifa);
2765         }
2766         if (start_at_beginning == 0) {
2767                 stcb->asoc.last_used_address = NULL;
2768                 goto sctp_from_the_top2;
2769         }
2770         return (NULL);
2771 }
2772
2773 static struct sctp_ifa *
2774 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2775     struct sctp_inpcb *inp,
2776     struct sctp_tcb *stcb,
2777     int non_asoc_addr_ok,
2778     uint8_t dest_is_loop,
2779     uint8_t dest_is_priv,
2780     int addr_wanted,
2781     sa_family_t fam,
2782     sctp_route_t * ro
2783 )
2784 {
2785         struct sctp_ifa *ifa, *sifa;
2786         int num_eligible_addr = 0;
2787
2788 #ifdef INET6
2789         struct sockaddr_in6 sin6, lsa6;
2790
2791         if (fam == AF_INET6) {
2792                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793                 (void)sa6_recoverscope(&sin6);
2794         }
2795 #endif                          /* INET6 */
2796         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797 #ifdef INET
2798                 if ((ifa->address.sa.sa_family == AF_INET) &&
2799                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin.sin_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804 #ifdef INET6
2805                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2806                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807                     &ifa->address.sin6.sin6_addr) != 0)) {
2808                         continue;
2809                 }
2810 #endif
2811                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812                     (non_asoc_addr_ok == 0))
2813                         continue;
2814                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815                     dest_is_priv, fam);
2816                 if (sifa == NULL)
2817                         continue;
2818 #ifdef INET6
2819                 if (fam == AF_INET6 &&
2820                     dest_is_loop &&
2821                     sifa->src_is_loop && sifa->src_is_priv) {
2822                         /*
2823                          * don't allow fe80::1 to be a src on loop ::1, we
2824                          * don't list it to the peer so we will get an
2825                          * abort.
2826                          */
2827                         continue;
2828                 }
2829                 if (fam == AF_INET6 &&
2830                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832                         /*
2833                          * link-local <-> link-local must belong to the same
2834                          * scope.
2835                          */
2836                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837                         (void)sa6_recoverscope(&lsa6);
2838                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839                                 continue;
2840                         }
2841                 }
2842 #endif                          /* INET6 */
2843
2844                 /*
2845                  * Check if the IPv6 address matches to next-hop. In the
2846                  * mobile case, old IPv6 address may be not deleted from the
2847                  * interface. Then, the interface has previous and new
2848                  * addresses.  We should use one corresponding to the
2849                  * next-hop.  (by micchie)
2850                  */
2851 #ifdef INET6
2852                 if (stcb && fam == AF_INET6 &&
2853                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855                             == 0) {
2856                                 continue;
2857                         }
2858                 }
2859 #endif
2860 #ifdef INET
2861                 /* Avoid topologically incorrect IPv4 address */
2862                 if (stcb && fam == AF_INET &&
2863                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865                                 continue;
2866                         }
2867                 }
2868 #endif
2869                 if (stcb) {
2870                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871                                 continue;
2872                         }
2873                         if (((non_asoc_addr_ok == 0) &&
2874                             (sctp_is_addr_restricted(stcb, sifa))) ||
2875                             (non_asoc_addr_ok &&
2876                             (sctp_is_addr_restricted(stcb, sifa)) &&
2877                             (!sctp_is_addr_pending(stcb, sifa)))) {
2878                                 /*
2879                                  * It is restricted for some reason..
2880                                  * probably not yet added.
2881                                  */
2882                                 continue;
2883                         }
2884                 }
2885                 if (num_eligible_addr >= addr_wanted) {
2886                         return (sifa);
2887                 }
2888                 num_eligible_addr++;
2889         }
2890         return (NULL);
2891 }
2892
2893
2894 static int
2895 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896     struct sctp_inpcb *inp,
2897     struct sctp_tcb *stcb,
2898     int non_asoc_addr_ok,
2899     uint8_t dest_is_loop,
2900     uint8_t dest_is_priv,
2901     sa_family_t fam)
2902 {
2903         struct sctp_ifa *ifa, *sifa;
2904         int num_eligible_addr = 0;
2905
2906         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907 #ifdef INET
2908                 if ((ifa->address.sa.sa_family == AF_INET) &&
2909                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin.sin_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914 #ifdef INET6
2915                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2916                     (stcb != NULL) &&
2917                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918                     &ifa->address.sin6.sin6_addr) != 0)) {
2919                         continue;
2920                 }
2921 #endif
2922                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923                     (non_asoc_addr_ok == 0)) {
2924                         continue;
2925                 }
2926                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927                     dest_is_priv, fam);
2928                 if (sifa == NULL) {
2929                         continue;
2930                 }
2931                 if (stcb) {
2932                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933                                 continue;
2934                         }
2935                         if (((non_asoc_addr_ok == 0) &&
2936                             (sctp_is_addr_restricted(stcb, sifa))) ||
2937                             (non_asoc_addr_ok &&
2938                             (sctp_is_addr_restricted(stcb, sifa)) &&
2939                             (!sctp_is_addr_pending(stcb, sifa)))) {
2940                                 /*
2941                                  * It is restricted for some reason..
2942                                  * probably not yet added.
2943                                  */
2944                                 continue;
2945                         }
2946                 }
2947                 num_eligible_addr++;
2948         }
2949         return (num_eligible_addr);
2950 }
2951
2952 static struct sctp_ifa *
2953 sctp_choose_boundall(struct sctp_inpcb *inp,
2954     struct sctp_tcb *stcb,
2955     struct sctp_nets *net,
2956     sctp_route_t * ro,
2957     uint32_t vrf_id,
2958     uint8_t dest_is_priv,
2959     uint8_t dest_is_loop,
2960     int non_asoc_addr_ok,
2961     sa_family_t fam)
2962 {
2963         int cur_addr_num = 0, num_preferred = 0;
2964         void *ifn;
2965         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966         struct sctp_ifa *sctp_ifa, *sifa;
2967         uint32_t ifn_index;
2968         struct sctp_vrf *vrf;
2969
2970 #ifdef INET
2971         int retried = 0;
2972
2973 #endif
2974
2975         /*-
2976          * For boundall we can use any address in the association.
2977          * If non_asoc_addr_ok is set we can use any address (at least in
2978          * theory). So we look for preferred addresses first. If we find one,
2979          * we use it. Otherwise we next try to get an address on the
2980          * interface, which we should be able to do (unless non_asoc_addr_ok
2981          * is false and we are routed out that way). In these cases where we
2982          * can't use the address of the interface we go through all the
2983          * ifn's looking for an address we can use and fill that in. Punting
2984          * means we send back address 0, which will probably cause problems
2985          * actually since then IP will fill in the address of the route ifn,
2986          * which means we probably already rejected it.. i.e. here comes an
2987          * abort :-<.
2988          */
2989         vrf = sctp_find_vrf(vrf_id);
2990         if (vrf == NULL)
2991                 return (NULL);
2992
2993         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997         if (sctp_ifn == NULL) {
2998                 /* ?? We don't have this guy ?? */
2999                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000                 goto bound_all_plan_b;
3001         }
3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003             ifn_index, sctp_ifn->ifn_name);
3004
3005         if (net) {
3006                 cur_addr_num = net->indx_of_eligible_next_to_use;
3007         }
3008         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009             inp, stcb,
3010             non_asoc_addr_ok,
3011             dest_is_loop,
3012             dest_is_priv, fam);
3013         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014             num_preferred, sctp_ifn->ifn_name);
3015         if (num_preferred == 0) {
3016                 /*
3017                  * no eligible addresses, we must use some other interface
3018                  * address if we can find one.
3019                  */
3020                 goto bound_all_plan_b;
3021         }
3022         /*
3023          * Ok we have num_eligible_addr set with how many we can use, this
3024          * may vary from call to call due to addresses being deprecated
3025          * etc..
3026          */
3027         if (cur_addr_num >= num_preferred) {
3028                 cur_addr_num = 0;
3029         }
3030         /*
3031          * select the nth address from the list (where cur_addr_num is the
3032          * nth) and 0 is the first one, 1 is the second one etc...
3033          */
3034         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037             dest_is_priv, cur_addr_num, fam, ro);
3038
3039         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3040         if (sctp_ifa) {
3041                 atomic_add_int(&sctp_ifa->refcount, 1);
3042                 if (net) {
3043                         /* save off where the next one we will want */
3044                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045                 }
3046                 return (sctp_ifa);
3047         }
3048         /*
3049          * plan_b: Look at all interfaces and find a preferred address. If
3050          * no preferred fall through to plan_c.
3051          */
3052 bound_all_plan_b:
3053         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056                     sctp_ifn->ifn_name);
3057                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058                         /* wrong base scope */
3059                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060                         continue;
3061                 }
3062                 if ((sctp_ifn == looked_at) && looked_at) {
3063                         /* already looked at this guy */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065                         continue;
3066                 }
3067                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068                     dest_is_loop, dest_is_priv, fam);
3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070                     "Found ifn:%p %d preferred source addresses\n",
3071                     ifn, num_preferred);
3072                 if (num_preferred == 0) {
3073                         /* None on this interface. */
3074                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3075                         continue;
3076                 }
3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081                 /*
3082                  * Ok we have num_eligible_addr set with how many we can
3083                  * use, this may vary from call to call due to addresses
3084                  * being deprecated etc..
3085                  */
3086                 if (cur_addr_num >= num_preferred) {
3087                         cur_addr_num = 0;
3088                 }
3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090                     dest_is_priv, cur_addr_num, fam, ro);
3091                 if (sifa == NULL)
3092                         continue;
3093                 if (net) {
3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096                             cur_addr_num);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101                 }
3102                 atomic_add_int(&sifa->refcount, 1);
3103                 return (sifa);
3104         }
3105 #ifdef INET
3106 again_with_private_addresses_allowed:
3107 #endif
3108         /* plan_c: do we have an acceptable address on the emit interface */
3109         sifa = NULL;
3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111         if (emit_ifn == NULL) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113                 goto plan_d;
3114         }
3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117 #ifdef INET
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125 #ifdef INET6
3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130                         continue;
3131                 }
3132 #endif
3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134                     (non_asoc_addr_ok == 0)) {
3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136                         continue;
3137                 }
3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139                     dest_is_priv, fam);
3140                 if (sifa == NULL) {
3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142                         continue;
3143                 }
3144                 if (stcb) {
3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147                                 sifa = NULL;
3148                                 continue;
3149                         }
3150                         if (((non_asoc_addr_ok == 0) &&
3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
3152                             (non_asoc_addr_ok &&
3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
3155                                 /*
3156                                  * It is restricted for some reason..
3157                                  * probably not yet added.
3158                                  */
3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3160                                 sifa = NULL;
3161                                 continue;
3162                         }
3163                 }
3164                 atomic_add_int(&sifa->refcount, 1);
3165                 goto out;
3166         }
3167 plan_d:
3168         /*
3169          * plan_d: We are in trouble. No preferred address on the emit
3170          * interface. And not even a preferred address on all interfaces. Go
3171          * out and see if we can find an acceptable address somewhere
3172          * amongst all interfaces.
3173          */
3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177                         /* wrong base scope */
3178                         continue;
3179                 }
3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181 #ifdef INET
3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3185                                 continue;
3186                         }
3187 #endif
3188 #ifdef INET6
3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192                                 continue;
3193                         }
3194 #endif
3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196                             (non_asoc_addr_ok == 0))
3197                                 continue;
3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199                             dest_is_loop,
3200                             dest_is_priv, fam);
3201                         if (sifa == NULL)
3202                                 continue;
3203                         if (stcb) {
3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205                                         sifa = NULL;
3206                                         continue;
3207                                 }
3208                                 if (((non_asoc_addr_ok == 0) &&
3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3210                                     (non_asoc_addr_ok &&
3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3213                                         /*
3214                                          * It is restricted for some
3215                                          * reason.. probably not yet added.
3216                                          */
3217                                         sifa = NULL;
3218                                         continue;
3219                                 }
3220                         }
3221                         goto out;
3222                 }
3223         }
3224 #ifdef INET
3225         if (stcb) {
3226                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3227                         stcb->asoc.scope.ipv4_local_scope = 1;
3228                         retried = 1;
3229                         goto again_with_private_addresses_allowed;
3230                 } else if (retried == 1) {
3231                         stcb->asoc.scope.ipv4_local_scope = 0;
3232                 }
3233         }
3234 #endif
3235 out:
3236 #ifdef INET
3237         if (sifa) {
3238                 if (retried == 1) {
3239                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3240                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3241                                         /* wrong base scope */
3242                                         continue;
3243                                 }
3244                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3245                                         struct sctp_ifa *tmp_sifa;
3246
3247 #ifdef INET
3248                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3249                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3250                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3251                                                 continue;
3252                                         }
3253 #endif
3254 #ifdef INET6
3255                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3256                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3257                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3258                                                 continue;
3259                                         }
3260 #endif
3261                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3262                                             (non_asoc_addr_ok == 0))
3263                                                 continue;
3264                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3265                                             dest_is_loop,
3266                                             dest_is_priv, fam);
3267                                         if (tmp_sifa == NULL) {
3268                                                 continue;
3269                                         }
3270                                         if (tmp_sifa == sifa) {
3271                                                 continue;
3272                                         }
3273                                         if (stcb) {
3274                                                 if (sctp_is_address_in_scope(tmp_sifa,
3275                                                     &stcb->asoc.scope, 0) == 0) {
3276                                                         continue;
3277                                                 }
3278                                                 if (((non_asoc_addr_ok == 0) &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3280                                                     (non_asoc_addr_ok &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3282                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3283                                                         /*
3284                                                          * It is restricted
3285                                                          * for some reason..
3286                                                          * probably not yet
3287                                                          * added.
3288                                                          */
3289                                                         continue;
3290                                                 }
3291                                         }
3292                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3293                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3294                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3295                                         }
3296                                 }
3297                         }
3298                 }
3299                 atomic_add_int(&sifa->refcount, 1);
3300         }
3301 #endif
3302         return (sifa);
3303 }
3304
3305
3306
3307 /* tcb may be NULL */
3308 struct sctp_ifa *
3309 sctp_source_address_selection(struct sctp_inpcb *inp,
3310     struct sctp_tcb *stcb,
3311     sctp_route_t * ro,
3312     struct sctp_nets *net,
3313     int non_asoc_addr_ok, uint32_t vrf_id)
3314 {
3315         struct sctp_ifa *answer;
3316         uint8_t dest_is_priv, dest_is_loop;
3317         sa_family_t fam;
3318
3319 #ifdef INET
3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325
3326 #endif
3327
3328         /**
3329          * Rules:
3330          * - Find the route if needed, cache if I can.
3331          * - Look at interface address in route, Is it in the bound list. If so we
3332          *   have the best source.
3333          * - If not we must rotate amongst the addresses.
3334          *
3335          * Cavets and issues
3336          *
3337          * Do we need to pay attention to scope. We can have a private address
3338          * or a global address we are sourcing or sending to. So if we draw
3339          * it out
3340          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3341          * For V4
3342          * ------------------------------------------
3343          *      source     *      dest  *  result
3344          * -----------------------------------------
3345          * <a>  Private    *    Global  *  NAT
3346          * -----------------------------------------
3347          * <b>  Private    *    Private *  No problem
3348          * -----------------------------------------
3349          * <c>  Global     *    Private *  Huh, How will this work?
3350          * -----------------------------------------
3351          * <d>  Global     *    Global  *  No Problem
3352          *------------------------------------------
3353          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3354          * For V6
3355          *------------------------------------------
3356          *      source     *      dest  *  result
3357          * -----------------------------------------
3358          * <a>  Linklocal  *    Global  *
3359          * -----------------------------------------
3360          * <b>  Linklocal  * Linklocal  *  No problem
3361          * -----------------------------------------
3362          * <c>  Global     * Linklocal  *  Huh, How will this work?
3363          * -----------------------------------------
3364          * <d>  Global     *    Global  *  No Problem
3365          *------------------------------------------
3366          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3367          *
3368          * And then we add to that what happens if there are multiple addresses
3369          * assigned to an interface. Remember the ifa on a ifn is a linked
3370          * list of addresses. So one interface can have more than one IP
3371          * address. What happens if we have both a private and a global
3372          * address? Do we then use context of destination to sort out which
3373          * one is best? And what about NAT's sending P->G may get you a NAT
3374          * translation, or should you select the G thats on the interface in
3375          * preference.
3376          *
3377          * Decisions:
3378          *
3379          * - count the number of addresses on the interface.
3380          * - if it is one, no problem except case <c>.
3381          *   For <a> we will assume a NAT out there.
3382          * - if there are more than one, then we need to worry about scope P
3383          *   or G. We should prefer G -> G and P -> P if possible.
3384          *   Then as a secondary fall back to mixed types G->P being a last
3385          *   ditch one.
3386          * - The above all works for bound all, but bound specific we need to
3387          *   use the same concept but instead only consider the bound
3388          *   addresses. If the bound set is NOT assigned to the interface then
3389          *   we must use rotation amongst the bound addresses..
3390          */
3391         if (ro->ro_rt == NULL) {
3392                 /*
3393                  * Need a route to cache.
3394                  */
3395                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3396         }
3397         if (ro->ro_rt == NULL) {
3398                 return (NULL);
3399         }
3400         fam = ro->ro_dst.sa_family;
3401         dest_is_priv = dest_is_loop = 0;
3402         /* Setup our scopes for the destination */
3403         switch (fam) {
3404 #ifdef INET
3405         case AF_INET:
3406                 /* Scope based on outbound address */
3407                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3408                         dest_is_loop = 1;
3409                         if (net != NULL) {
3410                                 /* mark it as local */
3411                                 net->addr_is_local = 1;
3412                         }
3413                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3414                         dest_is_priv = 1;
3415                 }
3416                 break;
3417 #endif
3418 #ifdef INET6
3419         case AF_INET6:
3420                 /* Scope based on outbound address */
3421                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3422                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3423                         /*
3424                          * If the address is a loopback address, which
3425                          * consists of "::1" OR "fe80::1%lo0", we are
3426                          * loopback scope. But we don't use dest_is_priv
3427                          * (link local addresses).
3428                          */
3429                         dest_is_loop = 1;
3430                         if (net != NULL) {
3431                                 /* mark it as local */
3432                                 net->addr_is_local = 1;
3433                         }
3434                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3435                         dest_is_priv = 1;
3436                 }
3437                 break;
3438 #endif
3439         }
3440         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3441         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3442         SCTP_IPI_ADDR_RLOCK();
3443         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3444                 /*
3445                  * Bound all case
3446                  */
3447                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3448                     dest_is_priv, dest_is_loop,
3449                     non_asoc_addr_ok, fam);
3450                 SCTP_IPI_ADDR_RUNLOCK();
3451                 return (answer);
3452         }
3453         /*
3454          * Subset bound case
3455          */
3456         if (stcb) {
3457                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3458                     vrf_id, dest_is_priv,
3459                     dest_is_loop,
3460                     non_asoc_addr_ok, fam);
3461         } else {
3462                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3463                     non_asoc_addr_ok,
3464                     dest_is_priv,
3465                     dest_is_loop, fam);
3466         }
3467         SCTP_IPI_ADDR_RUNLOCK();
3468         return (answer);
3469 }
3470
3471 static int
3472 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3473 {
3474         struct cmsghdr cmh;
3475         int tlen, at, found;
3476         struct sctp_sndinfo sndinfo;
3477         struct sctp_prinfo prinfo;
3478         struct sctp_authinfo authinfo;
3479
3480         tlen = SCTP_BUF_LEN(control);
3481         at = 0;
3482         found = 0;
3483         /*
3484          * Independent of how many mbufs, find the c_type inside the control
3485          * structure and copy out the data.
3486          */
3487         while (at < tlen) {
3488                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if (((int)cmh.cmsg_len + at) > tlen) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3502                     ((c_type == cmh.cmsg_type) ||
3503                     ((c_type == SCTP_SNDRCV) &&
3504                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3505                     (cmh.cmsg_type == SCTP_PRINFO) ||
3506                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3507                         if (c_type == cmh.cmsg_type) {
3508                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3509                                         return (found);
3510                                 }
3511                                 /* It is exactly what we want. Copy it out. */
3512                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3513                                 return (1);
3514                         } else {
3515                                 struct sctp_sndrcvinfo *sndrcvinfo;
3516
3517                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3518                                 if (found == 0) {
3519                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3520                                                 return (found);
3521                                         }
3522                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3523                                 }
3524                                 switch (cmh.cmsg_type) {
3525                                 case SCTP_SNDINFO:
3526                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3527                                                 return (found);
3528                                         }
3529                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3530                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3531                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3532                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3533                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3534                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3535                                         break;
3536                                 case SCTP_PRINFO:
3537                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3538                                                 return (found);
3539                                         }
3540                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3541                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3542                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3543                                         } else {
3544                                                 sndrcvinfo->sinfo_timetolive = 0;
3545                                         }
3546                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3547                                         break;
3548                                 case SCTP_AUTHINFO:
3549                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3550                                                 return (found);
3551                                         }
3552                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3553                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3554                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3555                                         break;
3556                                 default:
3557                                         return (found);
3558                                 }
3559                                 found = 1;
3560                         }
3561                 }
3562                 at += CMSG_ALIGN(cmh.cmsg_len);
3563         }
3564         return (found);
3565 }
3566
3567 static int
3568 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3569 {
3570         struct cmsghdr cmh;
3571         int tlen, at;
3572         struct sctp_initmsg initmsg;
3573
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576
3577 #endif
3578 #ifdef INET6
3579         struct sockaddr_in6 sin6;
3580
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (1);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (1);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (1);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604                         case SCTP_INIT:
3605                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3606                                         *error = EINVAL;
3607                                         return (1);
3608                                 }
3609                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), 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
3622 #if defined(SCTP_DETAILED_STR_STATS)
3623                                         int j;
3624
3625 #endif
3626
3627                                         /* Default is NOT correct */
3628                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3629                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3630                                         SCTP_TCB_UNLOCK(stcb);
3631                                         SCTP_MALLOC(tmp_str,
3632                                             struct sctp_stream_out *,
3633                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3634                                             SCTP_M_STRMO);
3635                                         SCTP_TCB_LOCK(stcb);
3636                                         if (tmp_str != NULL) {
3637                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3638                                                 stcb->asoc.strmout = tmp_str;
3639                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3640                                         } else {
3641                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3642                                         }
3643                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3644                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3645                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3646                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3647 #if defined(SCTP_DETAILED_STR_STATS)
3648                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3649                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3650                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3651                                                 }
3652 #else
3653                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3654                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3655 #endif
3656                                                 stcb->asoc.strmout[i].stream_no = i;
3657                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3658                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3659                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3660                                         }
3661                                 }
3662                                 break;
3663 #ifdef INET
3664                         case SCTP_DSTADDRV4:
3665                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3670                                 sin.sin_family = AF_INET;
3671                                 sin.sin_len = sizeof(struct sockaddr_in);
3672                                 sin.sin_port = stcb->rport;
3673                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3674                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3675                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3676                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3677                                         *error = EINVAL;
3678                                         return (1);
3679                                 }
3680                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3681                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3682                                         *error = ENOBUFS;
3683                                         return (1);
3684                                 }
3685                                 break;
3686 #endif
3687 #ifdef INET6
3688                         case SCTP_DSTADDRV6:
3689                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3690                                         *error = EINVAL;
3691                                         return (1);
3692                                 }
3693                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3694                                 sin6.sin6_family = AF_INET6;
3695                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3696                                 sin6.sin6_port = stcb->rport;
3697                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3698                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3699                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3700                                         *error = EINVAL;
3701                                         return (1);
3702                                 }
3703 #ifdef INET
3704                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3705                                         in6_sin6_2_sin(&sin, &sin6);
3706                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3707                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3708                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3709                                                 *error = EINVAL;
3710                                                 return (1);
3711                                         }
3712                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3713                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3714                                                 *error = ENOBUFS;
3715                                                 return (1);
3716                                         }
3717                                 } else
3718 #endif
3719                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3720                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3721                                         *error = ENOBUFS;
3722                                         return (1);
3723                                 }
3724                                 break;
3725 #endif
3726                         default:
3727                                 break;
3728                         }
3729                 }
3730                 at += CMSG_ALIGN(cmh.cmsg_len);
3731         }
3732         return (0);
3733 }
3734
3735 static struct sctp_tcb *
3736 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3737     uint16_t port,
3738     struct mbuf *control,
3739     struct sctp_nets **net_p,
3740     int *error)
3741 {
3742         struct cmsghdr cmh;
3743         int tlen, at;
3744         struct sctp_tcb *stcb;
3745         struct sockaddr *addr;
3746
3747 #ifdef INET
3748         struct sockaddr_in sin;
3749
3750 #endif
3751 #ifdef INET6
3752         struct sockaddr_in6 sin6;
3753
3754 #endif
3755
3756         tlen = SCTP_BUF_LEN(control);
3757         at = 0;
3758         while (at < tlen) {
3759                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3760                         /* There is not enough room for one more. */
3761                         *error = EINVAL;
3762                         return (NULL);
3763                 }
3764                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3765                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3766                         /* We dont't have a complete CMSG header. */
3767                         *error = EINVAL;
3768                         return (NULL);
3769                 }
3770                 if (((int)cmh.cmsg_len + at) > tlen) {
3771                         /* We don't have the complete CMSG. */
3772                         *error = EINVAL;
3773                         return (NULL);
3774                 }
3775                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3776                         switch (cmh.cmsg_type) {
3777 #ifdef INET
3778                         case SCTP_DSTADDRV4:
3779                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3784                                 sin.sin_family = AF_INET;
3785                                 sin.sin_len = sizeof(struct sockaddr_in);
3786                                 sin.sin_port = port;
3787                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3788                                 addr = (struct sockaddr *)&sin;
3789                                 break;
3790 #endif
3791 #ifdef INET6
3792                         case SCTP_DSTADDRV6:
3793                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3794                                         *error = EINVAL;
3795                                         return (NULL);
3796                                 }
3797                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3798                                 sin6.sin6_family = AF_INET6;
3799                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3800                                 sin6.sin6_port = port;
3801                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3802 #ifdef INET
3803                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3804                                         in6_sin6_2_sin(&sin, &sin6);
3805                                         addr = (struct sockaddr *)&sin;
3806                                 } else
3807 #endif
3808                                         addr = (struct sockaddr *)&sin6;
3809                                 break;
3810 #endif
3811                         default:
3812                                 addr = NULL;
3813                                 break;
3814                         }
3815                         if (addr) {
3816                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3817                                 if (stcb != NULL) {
3818                                         return (stcb);
3819                                 }
3820                         }
3821                 }
3822                 at += CMSG_ALIGN(cmh.cmsg_len);
3823         }
3824         return (NULL);
3825 }
3826
3827 static struct mbuf *
3828 sctp_add_cookie(struct mbuf *init, int init_offset,
3829     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3830 {
3831         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3832         struct sctp_state_cookie *stc;
3833         struct sctp_paramhdr *ph;
3834         uint8_t *foo;
3835         int sig_offset;
3836         uint16_t cookie_sz;
3837
3838         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3839             sizeof(struct sctp_paramhdr)), 0,
3840             M_NOWAIT, 1, MT_DATA);
3841         if (mret == NULL) {
3842                 return (NULL);
3843         }
3844         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3845         if (copy_init == NULL) {
3846                 sctp_m_freem(mret);
3847                 return (NULL);
3848         }
3849 #ifdef SCTP_MBUF_LOGGING
3850         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3851                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3852         }
3853 #endif
3854         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3855             M_NOWAIT);
3856         if (copy_initack == NULL) {
3857                 sctp_m_freem(mret);
3858                 sctp_m_freem(copy_init);
3859                 return (NULL);
3860         }
3861 #ifdef SCTP_MBUF_LOGGING
3862         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3863                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3864         }
3865 #endif
3866         /* easy side we just drop it on the end */
3867         ph = mtod(mret, struct sctp_paramhdr *);
3868         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3869             sizeof(struct sctp_paramhdr);
3870         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3871             sizeof(struct sctp_paramhdr));
3872         ph->param_type = htons(SCTP_STATE_COOKIE);
3873         ph->param_length = 0;   /* fill in at the end */
3874         /* Fill in the stc cookie data */
3875         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3876
3877         /* tack the INIT and then the INIT-ACK onto the chain */
3878         cookie_sz = 0;
3879         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880                 cookie_sz += SCTP_BUF_LEN(m_at);
3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3882                         SCTP_BUF_NEXT(m_at) = copy_init;
3883                         break;
3884                 }
3885         }
3886         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3887                 cookie_sz += SCTP_BUF_LEN(m_at);
3888                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3889                         SCTP_BUF_NEXT(m_at) = copy_initack;
3890                         break;
3891                 }
3892         }
3893         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3894                 cookie_sz += SCTP_BUF_LEN(m_at);
3895                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3896                         break;
3897                 }
3898         }
3899         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3900         if (sig == NULL) {
3901                 /* no space, so free the entire chain */
3902                 sctp_m_freem(mret);
3903                 return (NULL);
3904         }
3905         SCTP_BUF_LEN(sig) = 0;
3906         SCTP_BUF_NEXT(m_at) = sig;
3907         sig_offset = 0;
3908         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3909         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3910         *signature = foo;
3911         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3912         cookie_sz += SCTP_SIGNATURE_SIZE;
3913         ph->param_length = htons(cookie_sz);
3914         return (mret);
3915 }
3916
3917
3918 static uint8_t
3919 sctp_get_ect(struct sctp_tcb *stcb)
3920 {
3921         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3922                 return (SCTP_ECT0_BIT);
3923         } else {
3924                 return (0);
3925         }
3926 }
3927
3928 #if defined(INET) || defined(INET6)
3929 static void
3930 sctp_handle_no_route(struct sctp_tcb *stcb,
3931     struct sctp_nets *net,
3932     int so_locked)
3933 {
3934         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3935
3936         if (net) {
3937                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3938                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3939                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3940                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3941                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3942                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3943                                     stcb, 0,
3944                                     (void *)net,
3945                                     so_locked);
3946                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3947                                 net->dest_state &= ~SCTP_ADDR_PF;
3948                         }
3949                 }
3950                 if (stcb) {
3951                         if (net == stcb->asoc.primary_destination) {
3952                                 /* need a new primary */
3953                                 struct sctp_nets *alt;
3954
3955                                 alt = sctp_find_alternate_net(stcb, net, 0);
3956                                 if (alt != net) {
3957                                         if (stcb->asoc.alternate) {
3958                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3959                                         }
3960                                         stcb->asoc.alternate = alt;
3961                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3962                                         if (net->ro._s_addr) {
3963                                                 sctp_free_ifa(net->ro._s_addr);
3964                                                 net->ro._s_addr = NULL;
3965                                         }
3966                                         net->src_addr_selected = 0;
3967                                 }
3968                         }
3969                 }
3970         }
3971 }
3972
3973 #endif
3974
3975 static int
3976 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3977     struct sctp_tcb *stcb,      /* may be NULL */
3978     struct sctp_nets *net,
3979     struct sockaddr *to,
3980     struct mbuf *m,
3981     uint32_t auth_offset,
3982     struct sctp_auth_chunk *auth,
3983     uint16_t auth_keyid,
3984     int nofragment_flag,
3985     int ecn_ok,
3986     int out_of_asoc_ok,
3987     uint16_t src_port,
3988     uint16_t dest_port,
3989     uint32_t v_tag,
3990     uint16_t port,
3991     union sctp_sockstore *over_addr,
3992     uint8_t mflowtype, uint32_t mflowid,
3993 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3994     int so_locked SCTP_UNUSED
3995 #else
3996     int so_locked
3997 #endif
3998 )
3999 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4000 {
4001         /**
4002          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4003          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4004          * - fill in the HMAC digest of any AUTH chunk in the packet.
4005          * - calculate and fill in the SCTP checksum.
4006          * - prepend an IP address header.
4007          * - if boundall use INADDR_ANY.
4008          * - if boundspecific do source address selection.
4009          * - set fragmentation option for ipV4.
4010          * - On return from IP output, check/adjust mtu size of output
4011          *   interface and smallest_mtu size as well.
4012          */
4013         /* Will need ifdefs around this */
4014         struct mbuf *newm;
4015         struct sctphdr *sctphdr;
4016         int packet_length;
4017         int ret;
4018
4019 #if defined(INET) || defined(INET6)
4020         uint32_t vrf_id;
4021
4022 #endif
4023 #if defined(INET) || defined(INET6)
4024         struct mbuf *o_pak;
4025         sctp_route_t *ro = NULL;
4026         struct udphdr *udp = NULL;
4027
4028 #endif
4029         uint8_t tos_value;
4030
4031 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4032         struct socket *so = NULL;
4033
4034 #endif
4035
4036         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4037                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4038                 sctp_m_freem(m);
4039                 return (EFAULT);
4040         }
4041 #if defined(INET) || defined(INET6)
4042         if (stcb) {
4043                 vrf_id = stcb->asoc.vrf_id;
4044         } else {
4045                 vrf_id = inp->def_vrf_id;
4046         }
4047 #endif
4048         /* fill in the HMAC digest for any AUTH chunk in the packet */
4049         if ((auth != NULL) && (stcb != NULL)) {
4050                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4051         }
4052         if (net) {
4053                 tos_value = net->dscp;
4054         } else if (stcb) {
4055                 tos_value = stcb->asoc.default_dscp;
4056         } else {
4057                 tos_value = inp->sctp_ep.default_dscp;
4058         }
4059
4060         switch (to->sa_family) {
4061 #ifdef INET
4062         case AF_INET:
4063                 {
4064                         struct ip *ip = NULL;
4065                         sctp_route_t iproute;
4066                         int len;
4067
4068                         len = SCTP_MIN_V4_OVERHEAD;
4069                         if (port) {
4070                                 len += sizeof(struct udphdr);
4071                         }
4072                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4073                         if (newm == NULL) {
4074                                 sctp_m_freem(m);
4075                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4076                                 return (ENOMEM);
4077                         }
4078                         SCTP_ALIGN_TO_END(newm, len);
4079                         SCTP_BUF_LEN(newm) = len;
4080                         SCTP_BUF_NEXT(newm) = m;
4081                         m = newm;
4082                         if (net != NULL) {
4083                                 m->m_pkthdr.flowid = net->flowid;
4084                                 M_HASHTYPE_SET(m, net->flowtype);
4085                         } else {
4086                                 m->m_pkthdr.flowid = mflowid;
4087                                 M_HASHTYPE_SET(m, mflowtype);
4088                         }
4089                         packet_length = sctp_calculate_len(m);
4090                         ip = mtod(m, struct ip *);
4091                         ip->ip_v = IPVERSION;
4092                         ip->ip_hl = (sizeof(struct ip) >> 2);
4093                         if (tos_value == 0) {
4094                                 /*
4095                                  * This means especially, that it is not set
4096                                  * at the SCTP layer. So use the value from
4097                                  * the IP layer.
4098                                  */
4099                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4100                         }
4101                         tos_value &= 0xfc;
4102                         if (ecn_ok) {
4103                                 tos_value |= sctp_get_ect(stcb);
4104                         }
4105                         if ((nofragment_flag) && (port == 0)) {
4106                                 ip->ip_off = htons(IP_DF);
4107                         } else {
4108                                 ip->ip_off = htons(0);
4109                         }
4110                         /* FreeBSD has a function for ip_id's */
4111                         ip_fillid(ip);
4112
4113                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4114                         ip->ip_len = htons(packet_length);
4115                         ip->ip_tos = tos_value;
4116                         if (port) {
4117                                 ip->ip_p = IPPROTO_UDP;
4118                         } else {
4119                                 ip->ip_p = IPPROTO_SCTP;
4120                         }
4121                         ip->ip_sum = 0;
4122                         if (net == NULL) {
4123                                 ro = &iproute;
4124                                 memset(&iproute, 0, sizeof(iproute));
4125                                 memcpy(&ro->ro_dst, to, to->sa_len);
4126                         } else {
4127                                 ro = (sctp_route_t *) & net->ro;
4128                         }
4129                         /* Now the address selection part */
4130                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4131
4132                         /* call the routine to select the src address */
4133                         if (net && out_of_asoc_ok == 0) {
4134                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4135                                         sctp_free_ifa(net->ro._s_addr);
4136                                         net->ro._s_addr = NULL;
4137                                         net->src_addr_selected = 0;
4138                                         if (ro->ro_rt) {
4139                                                 RTFREE(ro->ro_rt);
4140                                                 ro->ro_rt = NULL;
4141                                         }
4142                                 }
4143                                 if (net->src_addr_selected == 0) {
4144                                         /* Cache the source address */
4145                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4146                                             ro, net, 0,
4147                                             vrf_id);
4148                                         net->src_addr_selected = 1;
4149                                 }
4150                                 if (net->ro._s_addr == NULL) {
4151                                         /* No route to host */
4152                                         net->src_addr_selected = 0;
4153                                         sctp_handle_no_route(stcb, net, so_locked);
4154                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4155                                         sctp_m_freem(m);
4156                                         return (EHOSTUNREACH);
4157                                 }
4158                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4159                         } else {
4160                                 if (over_addr == NULL) {
4161                                         struct sctp_ifa *_lsrc;
4162
4163                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4164                                             net,
4165                                             out_of_asoc_ok,
4166                                             vrf_id);
4167                                         if (_lsrc == NULL) {
4168                                                 sctp_handle_no_route(stcb, net, so_locked);
4169                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4170                                                 sctp_m_freem(m);
4171                                                 return (EHOSTUNREACH);
4172                                         }
4173                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4174                                         sctp_free_ifa(_lsrc);
4175                                 } else {
4176                                         ip->ip_src = over_addr->sin.sin_addr;
4177                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4178                                 }
4179                         }
4180                         if (port) {
4181                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4182                                         sctp_handle_no_route(stcb, net, so_locked);
4183                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4184                                         sctp_m_freem(m);
4185                                         return (EHOSTUNREACH);
4186                                 }
4187                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4188                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4189                                 udp->uh_dport = port;
4190                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip)));
4191                                 if (V_udp_cksum) {
4192                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4193                                 } else {
4194                                         udp->uh_sum = 0;
4195                                 }
4196                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4197                         } else {
4198                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4199                         }
4200
4201                         sctphdr->src_port = src_port;
4202                         sctphdr->dest_port = dest_port;
4203                         sctphdr->v_tag = v_tag;
4204                         sctphdr->checksum = 0;
4205
4206                         /*
4207                          * If source address selection fails and we find no
4208                          * route then the ip_output should fail as well with
4209                          * a NO_ROUTE_TO_HOST type error. We probably should
4210                          * catch that somewhere and abort the association
4211                          * right away (assuming this is an INIT being sent).
4212                          */
4213                         if (ro->ro_rt == NULL) {
4214                                 /*
4215                                  * src addr selection failed to find a route
4216                                  * (or valid source addr), so we can't get
4217                                  * there from here (yet)!
4218                                  */
4219                                 sctp_handle_no_route(stcb, net, so_locked);
4220                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4221                                 sctp_m_freem(m);
4222                                 return (EHOSTUNREACH);
4223                         }
4224                         if (ro != &iproute) {
4225                                 memcpy(&iproute, ro, sizeof(*ro));
4226                         }
4227                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4228                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4229                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4230                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4231                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4232                             (void *)ro->ro_rt);
4233
4234                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4235                                 /* failed to prepend data, give up */
4236                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4237                                 sctp_m_freem(m);
4238                                 return (ENOMEM);
4239                         }
4240                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4241                         if (port) {
4242 #if defined(SCTP_WITH_NO_CSUM)
4243                                 SCTP_STAT_INCR(sctps_sendnocrc);
4244 #else
4245                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4246                                 SCTP_STAT_INCR(sctps_sendswcrc);
4247 #endif
4248                                 if (V_udp_cksum) {
4249                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4250                                 }
4251                         } else {
4252 #if defined(SCTP_WITH_NO_CSUM)
4253                                 SCTP_STAT_INCR(sctps_sendnocrc);
4254 #else
4255                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4256                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4257                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4258 #endif
4259                         }
4260 #ifdef SCTP_PACKET_LOGGING
4261                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4262                                 sctp_packet_log(o_pak);
4263 #endif
4264                         /* send it out.  table id is taken from stcb */
4265 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4266                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4267                                 so = SCTP_INP_SO(inp);
4268                                 SCTP_SOCKET_UNLOCK(so, 0);
4269                         }
4270 #endif
4271                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4272 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4273                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4274                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4275                                 SCTP_TCB_UNLOCK(stcb);
4276                                 SCTP_SOCKET_LOCK(so, 0);
4277                                 SCTP_TCB_LOCK(stcb);
4278                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4279                         }
4280 #endif
4281                         SCTP_STAT_INCR(sctps_sendpackets);
4282                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4283                         if (ret)
4284                                 SCTP_STAT_INCR(sctps_senderrors);
4285
4286                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4287                         if (net == NULL) {
4288                                 /* free tempy routes */
4289                                 RO_RTFREE(ro);
4290                         } else {
4291                                 /*
4292                                  * PMTU check versus smallest asoc MTU goes
4293                                  * here
4294                                  */
4295                                 if ((ro->ro_rt != NULL) &&
4296                                     (net->ro._s_addr)) {
4297                                         uint32_t mtu;
4298
4299                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4300                                         if (net->port) {
4301                                                 mtu -= sizeof(struct udphdr);
4302                                         }
4303                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4304                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4305                                                 net->mtu = mtu;
4306                                         }
4307                                 } else if (ro->ro_rt == NULL) {
4308                                         /* route was freed */
4309                                         if (net->ro._s_addr &&
4310                                             net->src_addr_selected) {
4311                                                 sctp_free_ifa(net->ro._s_addr);
4312                                                 net->ro._s_addr = NULL;
4313                                         }
4314                                         net->src_addr_selected = 0;
4315                                 }
4316                         }
4317                         return (ret);
4318                 }
4319 #endif
4320 #ifdef INET6
4321         case AF_INET6:
4322                 {
4323                         uint32_t flowlabel, flowinfo;
4324                         struct ip6_hdr *ip6h;
4325                         struct route_in6 ip6route;
4326                         struct ifnet *ifp;
4327                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4328                         int prev_scope = 0;
4329                         struct sockaddr_in6 lsa6_storage;
4330                         int error;
4331                         u_short prev_port = 0;
4332                         int len;
4333
4334                         if (net) {
4335                                 flowlabel = net->flowlabel;
4336                         } else if (stcb) {
4337                                 flowlabel = stcb->asoc.default_flowlabel;
4338                         } else {
4339                                 flowlabel = inp->sctp_ep.default_flowlabel;
4340                         }
4341                         if (flowlabel == 0) {
4342                                 /*
4343                                  * This means especially, that it is not set
4344                                  * at the SCTP layer. So use the value from
4345                                  * the IP layer.
4346                                  */
4347                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4348                         }
4349                         flowlabel &= 0x000fffff;
4350                         len = SCTP_MIN_OVERHEAD;
4351                         if (port) {
4352                                 len += sizeof(struct udphdr);
4353                         }
4354                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4355                         if (newm == NULL) {
4356                                 sctp_m_freem(m);
4357                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4358                                 return (ENOMEM);
4359                         }
4360                         SCTP_ALIGN_TO_END(newm, len);
4361                         SCTP_BUF_LEN(newm) = len;
4362                         SCTP_BUF_NEXT(newm) = m;
4363                         m = newm;
4364                         if (net != NULL) {
4365                                 m->m_pkthdr.flowid = net->flowid;
4366                                 M_HASHTYPE_SET(m, net->flowtype);
4367                         } else {
4368                                 m->m_pkthdr.flowid = mflowid;
4369                                 M_HASHTYPE_SET(m, mflowtype);
4370                         }
4371                         packet_length = sctp_calculate_len(m);
4372
4373                         ip6h = mtod(m, struct ip6_hdr *);
4374                         /* protect *sin6 from overwrite */
4375                         sin6 = (struct sockaddr_in6 *)to;
4376                         tmp = *sin6;
4377                         sin6 = &tmp;
4378
4379                         /* KAME hack: embed scopeid */
4380                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4381                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4382                                 return (EINVAL);
4383                         }
4384                         if (net == NULL) {
4385                                 memset(&ip6route, 0, sizeof(ip6route));
4386                                 ro = (sctp_route_t *) & ip6route;
4387                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4388                         } else {
4389                                 ro = (sctp_route_t *) & net->ro;
4390                         }
4391                         /*
4392                          * We assume here that inp_flow is in host byte
4393                          * order within the TCB!
4394                          */
4395                         if (tos_value == 0) {
4396                                 /*
4397                                  * This means especially, that it is not set
4398                                  * at the SCTP layer. So use the value from
4399                                  * the IP layer.
4400                                  */
4401                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4402                         }
4403                         tos_value &= 0xfc;
4404                         if (ecn_ok) {
4405                                 tos_value |= sctp_get_ect(stcb);
4406                         }
4407                         flowinfo = 0x06;
4408                         flowinfo <<= 8;
4409                         flowinfo |= tos_value;
4410                         flowinfo <<= 20;
4411                         flowinfo |= flowlabel;
4412                         ip6h->ip6_flow = htonl(flowinfo);
4413                         if (port) {
4414                                 ip6h->ip6_nxt = IPPROTO_UDP;
4415                         } else {
4416                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4417                         }
4418                         ip6h->ip6_plen = (uint16_t) (packet_length - sizeof(struct ip6_hdr));
4419                         ip6h->ip6_dst = sin6->sin6_addr;
4420
4421                         /*
4422                          * Add SRC address selection here: we can only reuse
4423                          * to a limited degree the kame src-addr-sel, since
4424                          * we can try their selection but it may not be
4425                          * bound.
4426                          */
4427                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4428                         lsa6_tmp.sin6_family = AF_INET6;
4429                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4430                         lsa6 = &lsa6_tmp;
4431                         if (net && out_of_asoc_ok == 0) {
4432                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4433                                         sctp_free_ifa(net->ro._s_addr);
4434                                         net->ro._s_addr = NULL;
4435                                         net->src_addr_selected = 0;
4436                                         if (ro->ro_rt) {
4437                                                 RTFREE(ro->ro_rt);
4438                                                 ro->ro_rt = NULL;
4439                                         }
4440                                 }
4441                                 if (net->src_addr_selected == 0) {
4442                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4443                                         /* KAME hack: embed scopeid */
4444                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4445                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4446                                                 return (EINVAL);
4447                                         }
4448                                         /* Cache the source address */
4449                                         net->ro._s_addr = sctp_source_address_selection(inp,
4450                                             stcb,
4451                                             ro,
4452                                             net,
4453                                             0,
4454                                             vrf_id);
4455                                         (void)sa6_recoverscope(sin6);
4456                                         net->src_addr_selected = 1;
4457                                 }
4458                                 if (net->ro._s_addr == NULL) {
4459                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4460                                         net->src_addr_selected = 0;
4461                                         sctp_handle_no_route(stcb, net, so_locked);
4462                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4463                                         sctp_m_freem(m);
4464                                         return (EHOSTUNREACH);
4465                                 }
4466                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4467                         } else {
4468                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4469                                 /* KAME hack: embed scopeid */
4470                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4471                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4472                                         return (EINVAL);
4473                                 }
4474                                 if (over_addr == NULL) {
4475                                         struct sctp_ifa *_lsrc;
4476
4477                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4478                                             net,
4479                                             out_of_asoc_ok,
4480                                             vrf_id);
4481                                         if (_lsrc == NULL) {
4482                                                 sctp_handle_no_route(stcb, net, so_locked);
4483                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4484                                                 sctp_m_freem(m);
4485                                                 return (EHOSTUNREACH);
4486                                         }
4487                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4488                                         sctp_free_ifa(_lsrc);
4489                                 } else {
4490                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4491                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4492                                 }
4493                                 (void)sa6_recoverscope(sin6);
4494                         }
4495                         lsa6->sin6_port = inp->sctp_lport;
4496
4497                         if (ro->ro_rt == NULL) {
4498                                 /*
4499                                  * src addr selection failed to find a route
4500                                  * (or valid source addr), so we can't get
4501                                  * there from here!
4502                                  */
4503                                 sctp_handle_no_route(stcb, net, so_locked);
4504                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4505                                 sctp_m_freem(m);
4506                                 return (EHOSTUNREACH);
4507                         }
4508                         /*
4509                          * XXX: sa6 may not have a valid sin6_scope_id in
4510                          * the non-SCOPEDROUTING case.
4511                          */
4512                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4513                         lsa6_storage.sin6_family = AF_INET6;
4514                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4515                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4516                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4517                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4518                                 sctp_m_freem(m);
4519                                 return (error);
4520                         }
4521                         /* XXX */
4522                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4523                         lsa6_storage.sin6_port = inp->sctp_lport;
4524                         lsa6 = &lsa6_storage;
4525                         ip6h->ip6_src = lsa6->sin6_addr;
4526
4527                         if (port) {
4528                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4529                                         sctp_handle_no_route(stcb, net, so_locked);
4530                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4531                                         sctp_m_freem(m);
4532                                         return (EHOSTUNREACH);
4533                                 }
4534                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4535                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4536                                 udp->uh_dport = port;
4537                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip6_hdr)));
4538                                 udp->uh_sum = 0;
4539                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4540                         } else {
4541                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4542                         }
4543
4544                         sctphdr->src_port = src_port;
4545                         sctphdr->dest_port = dest_port;
4546                         sctphdr->v_tag = v_tag;
4547                         sctphdr->checksum = 0;
4548
4549                         /*
4550                          * We set the hop limit now since there is a good
4551                          * chance that our ro pointer is now filled
4552                          */
4553                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4554                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4555
4556 #ifdef SCTP_DEBUG
4557                         /* Copy to be sure something bad is not happening */
4558                         sin6->sin6_addr = ip6h->ip6_dst;
4559                         lsa6->sin6_addr = ip6h->ip6_src;
4560 #endif
4561
4562                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4563                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4564                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4565                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4566                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4567                         if (net) {
4568                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4569                                 /*
4570                                  * preserve the port and scope for link
4571                                  * local send
4572                                  */
4573                                 prev_scope = sin6->sin6_scope_id;
4574                                 prev_port = sin6->sin6_port;
4575                         }
4576                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4577                                 /* failed to prepend data, give up */
4578                                 sctp_m_freem(m);
4579                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4580                                 return (ENOMEM);
4581                         }
4582                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4583                         if (port) {
4584 #if defined(SCTP_WITH_NO_CSUM)
4585                                 SCTP_STAT_INCR(sctps_sendnocrc);
4586 #else
4587                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4588                                 SCTP_STAT_INCR(sctps_sendswcrc);
4589 #endif
4590                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4591                                         udp->uh_sum = 0xffff;
4592                                 }
4593                         } else {
4594 #if defined(SCTP_WITH_NO_CSUM)
4595                                 SCTP_STAT_INCR(sctps_sendnocrc);
4596 #else
4597                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4598                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4599                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4600 #endif
4601                         }
4602                         /* send it out. table id is taken from stcb */
4603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4604                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4605                                 so = SCTP_INP_SO(inp);
4606                                 SCTP_SOCKET_UNLOCK(so, 0);
4607                         }
4608 #endif
4609 #ifdef SCTP_PACKET_LOGGING
4610                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4611                                 sctp_packet_log(o_pak);
4612 #endif
4613                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4614 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4615                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4616                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4617                                 SCTP_TCB_UNLOCK(stcb);
4618                                 SCTP_SOCKET_LOCK(so, 0);
4619                                 SCTP_TCB_LOCK(stcb);
4620                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4621                         }
4622 #endif
4623                         if (net) {
4624                                 /* for link local this must be done */
4625                                 sin6->sin6_scope_id = prev_scope;
4626                                 sin6->sin6_port = prev_port;
4627                         }
4628                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4629                         SCTP_STAT_INCR(sctps_sendpackets);
4630                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4631                         if (ret) {
4632                                 SCTP_STAT_INCR(sctps_senderrors);
4633                         }
4634                         if (net == NULL) {
4635                                 /* Now if we had a temp route free it */
4636                                 RO_RTFREE(ro);
4637                         } else {
4638                                 /*
4639                                  * PMTU check versus smallest asoc MTU goes
4640                                  * here
4641                                  */
4642                                 if (ro->ro_rt == NULL) {
4643                                         /* Route was freed */
4644                                         if (net->ro._s_addr &&
4645                                             net->src_addr_selected) {
4646                                                 sctp_free_ifa(net->ro._s_addr);
4647                                                 net->ro._s_addr = NULL;
4648                                         }
4649                                         net->src_addr_selected = 0;
4650                                 }
4651                                 if ((ro->ro_rt != NULL) &&
4652                                     (net->ro._s_addr)) {
4653                                         uint32_t mtu;
4654
4655                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4656                                         if (mtu &&
4657                                             (stcb->asoc.smallest_mtu > mtu)) {
4658                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4659                                                 net->mtu = mtu;
4660                                                 if (net->port) {
4661                                                         net->mtu -= sizeof(struct udphdr);
4662                                                 }
4663                                         }
4664                                 } else if (ifp) {
4665                                         if (ND_IFINFO(ifp)->linkmtu &&
4666                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4667                                                 sctp_mtu_size_reset(inp,
4668                                                     &stcb->asoc,
4669                                                     ND_IFINFO(ifp)->linkmtu);
4670                                         }
4671                                 }
4672                         }
4673                         return (ret);
4674                 }
4675 #endif
4676         default:
4677                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4678                     ((struct sockaddr *)to)->sa_family);
4679                 sctp_m_freem(m);
4680                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4681                 return (EFAULT);
4682         }
4683 }
4684
4685
4686 void
4687 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4688 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4689     SCTP_UNUSED
4690 #endif
4691 )
4692 {
4693         struct mbuf *m, *m_last;
4694         struct sctp_nets *net;
4695         struct sctp_init_chunk *init;
4696         struct sctp_supported_addr_param *sup_addr;
4697         struct sctp_adaptation_layer_indication *ali;
4698         struct sctp_supported_chunk_types_param *pr_supported;
4699         struct sctp_paramhdr *ph;
4700         int cnt_inits_to = 0;
4701         int ret;
4702         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4703
4704         /* INIT's always go to the primary (and usually ONLY address) */
4705         net = stcb->asoc.primary_destination;
4706         if (net == NULL) {
4707                 net = TAILQ_FIRST(&stcb->asoc.nets);
4708                 if (net == NULL) {
4709                         /* TSNH */
4710                         return;
4711                 }
4712                 /* we confirm any address we send an INIT to */
4713                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4714                 (void)sctp_set_primary_addr(stcb, NULL, net);
4715         } else {
4716                 /* we confirm any address we send an INIT to */
4717                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4718         }
4719         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4720 #ifdef INET6
4721         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4722                 /*
4723                  * special hook, if we are sending to link local it will not
4724                  * show up in our private address count.
4725                  */
4726                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4727                         cnt_inits_to = 1;
4728         }
4729 #endif
4730         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4731                 /* This case should not happen */
4732                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4733                 return;
4734         }
4735         /* start the INIT timer */
4736         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4737
4738         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4739         if (m == NULL) {
4740                 /* No memory, INIT timer will re-attempt. */
4741                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4742                 return;
4743         }
4744         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4745         padding_len = 0;
4746         /* Now lets put the chunk header in place */
4747         init = mtod(m, struct sctp_init_chunk *);
4748         /* now the chunk header */
4749         init->ch.chunk_type = SCTP_INITIATION;
4750         init->ch.chunk_flags = 0;
4751         /* fill in later from mbuf we build */
4752         init->ch.chunk_length = 0;
4753         /* place in my tag */
4754         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4755         /* set up some of the credits. */
4756         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4757             SCTP_MINIMAL_RWND));
4758         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4759         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4760         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4761
4762         /* Adaptation layer indication parameter */
4763         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4764                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4765                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4766                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4767                 ali->ph.param_length = htons(parameter_len);
4768                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4769                 chunk_len += parameter_len;
4770         }
4771         /* ECN parameter */
4772         if (stcb->asoc.ecn_supported == 1) {
4773                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4774                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4775                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4776                 ph->param_length = htons(parameter_len);
4777                 chunk_len += parameter_len;
4778         }
4779         /* PR-SCTP supported parameter */
4780         if (stcb->asoc.prsctp_supported == 1) {
4781                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4782                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4783                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4784                 ph->param_length = htons(parameter_len);
4785                 chunk_len += parameter_len;
4786         }
4787         /* Add NAT friendly parameter. */
4788         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4789                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4790                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4791                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4792                 ph->param_length = htons(parameter_len);
4793                 chunk_len += parameter_len;
4794         }
4795         /* And now tell the peer which extensions we support */
4796         num_ext = 0;
4797         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4798         if (stcb->asoc.prsctp_supported == 1) {
4799                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4800                 if (stcb->asoc.idata_supported) {
4801                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4802                 }
4803         }
4804         if (stcb->asoc.auth_supported == 1) {
4805                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4806         }
4807         if (stcb->asoc.asconf_supported == 1) {
4808                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4809                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4810         }
4811         if (stcb->asoc.reconfig_supported == 1) {
4812                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4813         }
4814         if (stcb->asoc.idata_supported) {
4815                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4816         }
4817         if (stcb->asoc.nrsack_supported == 1) {
4818                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4819         }
4820         if (stcb->asoc.pktdrop_supported == 1) {
4821                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4822         }
4823         if (num_ext > 0) {
4824                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4825                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4826                 pr_supported->ph.param_length = htons(parameter_len);
4827                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4828                 chunk_len += parameter_len;
4829         }
4830         /* add authentication parameters */
4831         if (stcb->asoc.auth_supported) {
4832                 /* attach RANDOM parameter, if available */
4833                 if (stcb->asoc.authinfo.random != NULL) {
4834                         struct sctp_auth_random *randp;
4835
4836                         if (padding_len > 0) {
4837                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4838                                 chunk_len += padding_len;
4839                                 padding_len = 0;
4840                         }
4841                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4842                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4843                         /* random key already contains the header */
4844                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4845                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4846                         chunk_len += parameter_len;
4847                 }
4848                 /* add HMAC_ALGO parameter */
4849                 if (stcb->asoc.local_hmacs != NULL) {
4850                         struct sctp_auth_hmac_algo *hmacs;
4851
4852                         if (padding_len > 0) {
4853                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4854                                 chunk_len += padding_len;
4855                                 padding_len = 0;
4856                         }
4857                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4858                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4859                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4860                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4861                         hmacs->ph.param_length = htons(parameter_len);
4862                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4863                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4864                         chunk_len += parameter_len;
4865                 }
4866                 /* add CHUNKS parameter */
4867                 if (stcb->asoc.local_auth_chunks != NULL) {
4868                         struct sctp_auth_chunk_list *chunks;
4869
4870                         if (padding_len > 0) {
4871                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4872                                 chunk_len += padding_len;
4873                                 padding_len = 0;
4874                         }
4875                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4876                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4877                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4878                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4879                         chunks->ph.param_length = htons(parameter_len);
4880                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4881                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4882                         chunk_len += parameter_len;
4883                 }
4884         }
4885         /* now any cookie time extensions */
4886         if (stcb->asoc.cookie_preserve_req) {
4887                 struct sctp_cookie_perserve_param *cookie_preserve;
4888
4889                 if (padding_len > 0) {
4890                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891                         chunk_len += padding_len;
4892                         padding_len = 0;
4893                 }
4894                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4895                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4896                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4897                 cookie_preserve->ph.param_length = htons(parameter_len);
4898                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4899                 stcb->asoc.cookie_preserve_req = 0;
4900                 chunk_len += parameter_len;
4901         }
4902         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4903                 uint8_t i;
4904
4905                 if (padding_len > 0) {
4906                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4907                         chunk_len += padding_len;
4908                         padding_len = 0;
4909                 }
4910                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4911                 if (stcb->asoc.scope.ipv4_addr_legal) {
4912                         parameter_len += (uint16_t) sizeof(uint16_t);
4913                 }
4914                 if (stcb->asoc.scope.ipv6_addr_legal) {
4915                         parameter_len += (uint16_t) sizeof(uint16_t);
4916                 }
4917                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4918                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4919                 sup_addr->ph.param_length = htons(parameter_len);
4920                 i = 0;
4921                 if (stcb->asoc.scope.ipv4_addr_legal) {
4922                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4923                 }
4924                 if (stcb->asoc.scope.ipv6_addr_legal) {
4925                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4926                 }
4927                 padding_len = 4 - 2 * i;
4928                 chunk_len += parameter_len;
4929         }
4930         SCTP_BUF_LEN(m) = chunk_len;
4931         /* now the addresses */
4932         /*
4933          * To optimize this we could put the scoping stuff into a structure
4934          * and remove the individual uint8's from the assoc structure. Then
4935          * we could just sifa in the address within the stcb. But for now
4936          * this is a quick hack to get the address stuff teased apart.
4937          */
4938         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4939             m, cnt_inits_to,
4940             &padding_len, &chunk_len);
4941
4942         init->ch.chunk_length = htons(chunk_len);
4943         if (padding_len > 0) {
4944                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4945                         sctp_m_freem(m);
4946                         return;
4947                 }
4948         }
4949         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4950         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4951             (struct sockaddr *)&net->ro._l_addr,
4952             m, 0, NULL, 0, 0, 0, 0,
4953             inp->sctp_lport, stcb->rport, htonl(0),
4954             net->port, NULL,
4955             0, 0,
4956             so_locked);
4957         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4958         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4959         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4960 }
4961
4962 struct mbuf *
4963 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4964     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4965 {
4966         /*
4967          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4968          * being equal to the beginning of the params i.e. (iphlen +
4969          * sizeof(struct sctp_init_msg) parse through the parameters to the
4970          * end of the mbuf verifying that all parameters are known.
4971          *
4972          * For unknown parameters build and return a mbuf with
4973          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4974          * processing this chunk stop, and set *abort_processing to 1.
4975          *
4976          * By having param_offset be pre-set to where parameters begin it is
4977          * hoped that this routine may be reused in the future by new
4978          * features.
4979          */
4980         struct sctp_paramhdr *phdr, params;
4981
4982         struct mbuf *mat, *op_err;
4983         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4984         int at, limit, pad_needed;
4985         uint16_t ptype, plen, padded_size;
4986         int err_at;
4987
4988         *abort_processing = 0;
4989         mat = in_initpkt;
4990         err_at = 0;
4991         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4992         at = param_offset;
4993         op_err = NULL;
4994         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4995         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4996         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4997                 ptype = ntohs(phdr->param_type);
4998                 plen = ntohs(phdr->param_length);
4999                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5000                         /* wacked parameter */
5001                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5002                         goto invalid_size;
5003                 }
5004                 limit -= SCTP_SIZE32(plen);
5005                 /*-
5006                  * All parameters for all chunks that we know/understand are
5007                  * listed here. We process them other places and make
5008                  * appropriate stop actions per the upper bits. However this
5009                  * is the generic routine processor's can call to get back
5010                  * an operr.. to either incorporate (init-ack) or send.
5011                  */
5012                 padded_size = SCTP_SIZE32(plen);
5013                 switch (ptype) {
5014                         /* Param's with variable size */
5015                 case SCTP_HEARTBEAT_INFO:
5016                 case SCTP_STATE_COOKIE:
5017                 case SCTP_UNRECOG_PARAM:
5018                 case SCTP_ERROR_CAUSE_IND:
5019                         /* ok skip fwd */
5020                         at += padded_size;
5021                         break;
5022                         /* Param's with variable size within a range */
5023                 case SCTP_CHUNK_LIST:
5024                 case SCTP_SUPPORTED_CHUNK_EXT:
5025                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5026                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5027                                 goto invalid_size;
5028                         }
5029                         at += padded_size;
5030                         break;
5031                 case SCTP_SUPPORTED_ADDRTYPE:
5032                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5033                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5034                                 goto invalid_size;
5035                         }
5036                         at += padded_size;
5037                         break;
5038                 case SCTP_RANDOM:
5039                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5040                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5041                                 goto invalid_size;
5042                         }
5043                         at += padded_size;
5044                         break;
5045                 case SCTP_SET_PRIM_ADDR:
5046                 case SCTP_DEL_IP_ADDRESS:
5047                 case SCTP_ADD_IP_ADDRESS:
5048                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5049                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5050                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5051                                 goto invalid_size;
5052                         }
5053                         at += padded_size;
5054                         break;
5055                         /* Param's with a fixed size */
5056                 case SCTP_IPV4_ADDRESS:
5057                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                 case SCTP_IPV6_ADDRESS:
5064                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5065                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5066                                 goto invalid_size;
5067                         }
5068                         at += padded_size;
5069                         break;
5070                 case SCTP_COOKIE_PRESERVE:
5071                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5073                                 goto invalid_size;
5074                         }
5075                         at += padded_size;
5076                         break;
5077                 case SCTP_HAS_NAT_SUPPORT:
5078                         *nat_friendly = 1;
5079                         /* fall through */
5080                 case SCTP_PRSCTP_SUPPORTED:
5081                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5082                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5083                                 goto invalid_size;
5084                         }
5085                         at += padded_size;
5086                         break;
5087                 case SCTP_ECN_CAPABLE:
5088                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5089                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5090                                 goto invalid_size;
5091                         }
5092                         at += padded_size;
5093                         break;
5094                 case SCTP_ULP_ADAPTATION:
5095                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5096                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5097                                 goto invalid_size;
5098                         }
5099                         at += padded_size;
5100                         break;
5101                 case SCTP_SUCCESS_REPORT:
5102                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5103                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5104                                 goto invalid_size;
5105                         }
5106                         at += padded_size;
5107                         break;
5108                 case SCTP_HOSTNAME_ADDRESS:
5109                         {
5110                                 /* We can NOT handle HOST NAME addresses!! */
5111                                 int l_len;
5112
5113                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5114                                 *abort_processing = 1;
5115                                 if (op_err == NULL) {
5116                                         /* Ok need to try to get a mbuf */
5117 #ifdef INET6
5118                                         l_len = SCTP_MIN_OVERHEAD;
5119 #else
5120                                         l_len = SCTP_MIN_V4_OVERHEAD;
5121 #endif
5122                                         l_len += sizeof(struct sctp_chunkhdr);
5123                                         l_len += plen;
5124                                         l_len += sizeof(struct sctp_paramhdr);
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                                                  * and sctp header  and
5131                                                  * chunk hdr
5132                                                  */
5133 #ifdef INET6
5134                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5135 #else
5136                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5137 #endif
5138                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5139                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5140                                         }
5141                                 }
5142                                 if (op_err) {
5143                                         /* If we have space */
5144                                         struct sctp_paramhdr s;
5145
5146                                         if (err_at % 4) {
5147                                                 uint32_t cpthis = 0;
5148
5149                                                 pad_needed = 4 - (err_at % 4);
5150                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5151                                                 err_at += pad_needed;
5152                                         }
5153                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5154                                         s.param_length = htons(sizeof(s) + plen);
5155                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5156                                         err_at += sizeof(s);
5157                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5158                                         if (phdr == NULL) {
5159                                                 sctp_m_freem(op_err);
5160                                                 /*
5161                                                  * we are out of memory but
5162                                                  * we still need to have a
5163                                                  * look at what to do (the
5164                                                  * system is in trouble
5165                                                  * though).
5166                                                  */
5167                                                 return (NULL);
5168                                         }
5169                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5170                                 }
5171                                 return (op_err);
5172                                 break;
5173                         }
5174                 default:
5175                         /*
5176                          * we do not recognize the parameter figure out what
5177                          * we do.
5178                          */
5179                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5180                         if ((ptype & 0x4000) == 0x4000) {
5181                                 /* Report bit is set?? */
5182                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5183                                 if (op_err == NULL) {
5184                                         int l_len;
5185
5186                                         /* Ok need to try to get an mbuf */
5187 #ifdef INET6
5188                                         l_len = SCTP_MIN_OVERHEAD;
5189 #else
5190                                         l_len = SCTP_MIN_V4_OVERHEAD;
5191 #endif
5192                                         l_len += sizeof(struct sctp_chunkhdr);
5193                                         l_len += plen;
5194                                         l_len += sizeof(struct sctp_paramhdr);
5195                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5196                                         if (op_err) {
5197                                                 SCTP_BUF_LEN(op_err) = 0;
5198 #ifdef INET6
5199                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5200 #else
5201                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5202 #endif
5203                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5204                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5205                                         }
5206                                 }
5207                                 if (op_err) {
5208                                         /* If we have space */
5209                                         struct sctp_paramhdr s;
5210
5211                                         if (err_at % 4) {
5212                                                 uint32_t cpthis = 0;
5213
5214                                                 pad_needed = 4 - (err_at % 4);
5215                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5216                                                 err_at += pad_needed;
5217                                         }
5218                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5219                                         s.param_length = htons(sizeof(s) + plen);
5220                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5221                                         err_at += sizeof(s);
5222                                         if (plen > sizeof(tempbuf)) {
5223                                                 plen = sizeof(tempbuf);
5224                                         }
5225                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5226                                         if (phdr == NULL) {
5227                                                 sctp_m_freem(op_err);
5228                                                 /*
5229                                                  * we are out of memory but
5230                                                  * we still need to have a
5231                                                  * look at what to do (the
5232                                                  * system is in trouble
5233                                                  * though).
5234                                                  */
5235                                                 op_err = NULL;
5236                                                 goto more_processing;
5237                                         }
5238                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5239                                         err_at += plen;
5240                                 }
5241                         }
5242         more_processing:
5243                         if ((ptype & 0x8000) == 0x0000) {
5244                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5245                                 return (op_err);
5246                         } else {
5247                                 /* skip this chunk and continue processing */
5248                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5249                                 at += SCTP_SIZE32(plen);
5250                         }
5251                         break;
5252
5253                 }
5254                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5255         }
5256         return (op_err);
5257 invalid_size:
5258         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5259         *abort_processing = 1;
5260         if ((op_err == NULL) && phdr) {
5261                 int l_len;
5262
5263 #ifdef INET6
5264                 l_len = SCTP_MIN_OVERHEAD;
5265 #else
5266                 l_len = SCTP_MIN_V4_OVERHEAD;
5267 #endif
5268                 l_len += sizeof(struct sctp_chunkhdr);
5269                 l_len += (2 * sizeof(struct sctp_paramhdr));
5270                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5271                 if (op_err) {
5272                         SCTP_BUF_LEN(op_err) = 0;
5273 #ifdef INET6
5274                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5275 #else
5276                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5277 #endif
5278                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5279                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5280                 }
5281         }
5282         if ((op_err) && phdr) {
5283                 struct sctp_paramhdr s;
5284
5285                 if (err_at % 4) {
5286                         uint32_t cpthis = 0;
5287
5288                         pad_needed = 4 - (err_at % 4);
5289                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5290                         err_at += pad_needed;
5291                 }
5292                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5293                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5294                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5295                 err_at += sizeof(s);
5296                 /* Only copy back the p-hdr that caused the issue */
5297                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5298         }
5299         return (op_err);
5300 }
5301
5302 static int
5303 sctp_are_there_new_addresses(struct sctp_association *asoc,
5304     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5305 {
5306         /*
5307          * Given a INIT packet, look through the packet to verify that there
5308          * are NO new addresses. As we go through the parameters add reports
5309          * of any un-understood parameters that require an error.  Also we
5310          * must return (1) to drop the packet if we see a un-understood
5311          * parameter that tells us to drop the chunk.
5312          */
5313         struct sockaddr *sa_touse;
5314         struct sockaddr *sa;
5315         struct sctp_paramhdr *phdr, params;
5316         uint16_t ptype, plen;
5317         uint8_t fnd;
5318         struct sctp_nets *net;
5319         int check_src;
5320
5321 #ifdef INET
5322         struct sockaddr_in sin4, *sa4;
5323
5324 #endif
5325 #ifdef INET6
5326         struct sockaddr_in6 sin6, *sa6;
5327
5328 #endif
5329
5330 #ifdef INET
5331         memset(&sin4, 0, sizeof(sin4));
5332         sin4.sin_family = AF_INET;
5333         sin4.sin_len = sizeof(sin4);
5334 #endif
5335 #ifdef INET6
5336         memset(&sin6, 0, sizeof(sin6));
5337         sin6.sin6_family = AF_INET6;
5338         sin6.sin6_len = sizeof(sin6);
5339 #endif
5340         /* First what about the src address of the pkt ? */
5341         check_src = 0;
5342         switch (src->sa_family) {
5343 #ifdef INET
5344         case AF_INET:
5345                 if (asoc->scope.ipv4_addr_legal) {
5346                         check_src = 1;
5347                 }
5348                 break;
5349 #endif
5350 #ifdef INET6
5351         case AF_INET6:
5352                 if (asoc->scope.ipv6_addr_legal) {
5353                         check_src = 1;
5354                 }
5355                 break;
5356 #endif
5357         default:
5358                 /* TSNH */
5359                 break;
5360         }
5361         if (check_src) {
5362                 fnd = 0;
5363                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5364                         sa = (struct sockaddr *)&net->ro._l_addr;
5365                         if (sa->sa_family == src->sa_family) {
5366 #ifdef INET
5367                                 if (sa->sa_family == AF_INET) {
5368                                         struct sockaddr_in *src4;
5369
5370                                         sa4 = (struct sockaddr_in *)sa;
5371                                         src4 = (struct sockaddr_in *)src;
5372                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5373                                                 fnd = 1;
5374                                                 break;
5375                                         }
5376                                 }
5377 #endif
5378 #ifdef INET6
5379                                 if (sa->sa_family == AF_INET6) {
5380                                         struct sockaddr_in6 *src6;
5381
5382                                         sa6 = (struct sockaddr_in6 *)sa;
5383                                         src6 = (struct sockaddr_in6 *)src;
5384                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5385                                                 fnd = 1;
5386                                                 break;
5387                                         }
5388                                 }
5389 #endif
5390                         }
5391                 }
5392                 if (fnd == 0) {
5393                         /* New address added! no need to look further. */
5394                         return (1);
5395                 }
5396         }
5397         /* Ok so far lets munge through the rest of the packet */
5398         offset += sizeof(struct sctp_init_chunk);
5399         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5400         while (phdr) {
5401                 sa_touse = NULL;
5402                 ptype = ntohs(phdr->param_type);
5403                 plen = ntohs(phdr->param_length);
5404                 switch (ptype) {
5405 #ifdef INET
5406                 case SCTP_IPV4_ADDRESS:
5407                         {
5408                                 struct sctp_ipv4addr_param *p4, p4_buf;
5409
5410                                 phdr = sctp_get_next_param(in_initpkt, offset,
5411                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5412                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5413                                     phdr == NULL) {
5414                                         return (1);
5415                                 }
5416                                 if (asoc->scope.ipv4_addr_legal) {
5417                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5418                                         sin4.sin_addr.s_addr = p4->addr;
5419                                         sa_touse = (struct sockaddr *)&sin4;
5420                                 }
5421                                 break;
5422                         }
5423 #endif
5424 #ifdef INET6
5425                 case SCTP_IPV6_ADDRESS:
5426                         {
5427                                 struct sctp_ipv6addr_param *p6, p6_buf;
5428
5429                                 phdr = sctp_get_next_param(in_initpkt, offset,
5430                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5431                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5432                                     phdr == NULL) {
5433                                         return (1);
5434                                 }
5435                                 if (asoc->scope.ipv6_addr_legal) {
5436                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5437                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5438                                             sizeof(p6->addr));
5439                                         sa_touse = (struct sockaddr *)&sin6;
5440                                 }
5441                                 break;
5442                         }
5443 #endif
5444                 default:
5445                         sa_touse = NULL;
5446                         break;
5447                 }
5448                 if (sa_touse) {
5449                         /* ok, sa_touse points to one to check */
5450                         fnd = 0;
5451                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5452                                 sa = (struct sockaddr *)&net->ro._l_addr;
5453                                 if (sa->sa_family != sa_touse->sa_family) {
5454                                         continue;
5455                                 }
5456 #ifdef INET
5457                                 if (sa->sa_family == AF_INET) {
5458                                         sa4 = (struct sockaddr_in *)sa;
5459                                         if (sa4->sin_addr.s_addr ==
5460                                             sin4.sin_addr.s_addr) {
5461                                                 fnd = 1;
5462                                                 break;
5463                                         }
5464                                 }
5465 #endif
5466 #ifdef INET6
5467                                 if (sa->sa_family == AF_INET6) {
5468                                         sa6 = (struct sockaddr_in6 *)sa;
5469                                         if (SCTP6_ARE_ADDR_EQUAL(
5470                                             sa6, &sin6)) {
5471                                                 fnd = 1;
5472                                                 break;
5473                                         }
5474                                 }
5475 #endif
5476                         }
5477                         if (!fnd) {
5478                                 /* New addr added! no need to look further */
5479                                 return (1);
5480                         }
5481                 }
5482                 offset += SCTP_SIZE32(plen);
5483                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5484         }
5485         return (0);
5486 }
5487
5488 /*
5489  * Given a MBUF chain that was sent into us containing an INIT. Build a
5490  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5491  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5492  * message (i.e. the struct sctp_init_msg).
5493  */
5494 void
5495 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5496     struct sctp_nets *src_net, struct mbuf *init_pkt,
5497     int iphlen, int offset,
5498     struct sockaddr *src, struct sockaddr *dst,
5499     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5500     uint8_t mflowtype, uint32_t mflowid,
5501     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5502 {
5503         struct sctp_association *asoc;
5504         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5505         struct sctp_init_ack_chunk *initack;
5506         struct sctp_adaptation_layer_indication *ali;
5507         struct sctp_supported_chunk_types_param *pr_supported;
5508         struct sctp_paramhdr *ph;
5509         union sctp_sockstore *over_addr;
5510         struct sctp_scoping scp;
5511
5512 #ifdef INET
5513         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5514         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5515         struct sockaddr_in *sin;
5516
5517 #endif
5518 #ifdef INET6
5519         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5520         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5521         struct sockaddr_in6 *sin6;
5522
5523 #endif
5524         struct sockaddr *to;
5525         struct sctp_state_cookie stc;
5526         struct sctp_nets *net = NULL;
5527         uint8_t *signature = NULL;
5528         int cnt_inits_to = 0;
5529         uint16_t his_limit, i_want;
5530         int abort_flag;
5531         int nat_friendly = 0;
5532         struct socket *so;
5533         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5534
5535         if (stcb) {
5536                 asoc = &stcb->asoc;
5537         } else {
5538                 asoc = NULL;
5539         }
5540         if ((asoc != NULL) &&
5541             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5542                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5543                         /*
5544                          * new addresses, out of here in non-cookie-wait
5545                          * states
5546                          *
5547                          * Send an ABORT, without the new address error cause.
5548                          * This looks no different than if no listener was
5549                          * present.
5550                          */
5551                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5552                             "Address added");
5553                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5554                             mflowtype, mflowid, inp->fibnum,
5555                             vrf_id, port);
5556                         return;
5557                 }
5558                 if (src_net != NULL && (src_net->port != port)) {
5559                         /*
5560                          * change of remote encapsulation port, out of here
5561                          * in non-cookie-wait states
5562                          *
5563                          * Send an ABORT, without an specific error cause. This
5564                          * looks no different than if no listener was
5565                          * present.
5566                          */
5567                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5568                             "Remote encapsulation port changed");
5569                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5570                             mflowtype, mflowid, inp->fibnum,
5571                             vrf_id, port);
5572                         return;
5573                 }
5574         }
5575         abort_flag = 0;
5576         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5577             (offset + sizeof(struct sctp_init_chunk)),
5578             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5579         if (abort_flag) {
5580 do_a_abort:
5581                 if (op_err == NULL) {
5582                         char msg[SCTP_DIAG_INFO_LEN];
5583
5584                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5585                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5586                             msg);
5587                 }
5588                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5589                     init_chk->init.initiate_tag, op_err,
5590                     mflowtype, mflowid, inp->fibnum,
5591                     vrf_id, port);
5592                 return;
5593         }
5594         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5595         if (m == NULL) {
5596                 /* No memory, INIT timer will re-attempt. */
5597                 if (op_err)
5598                         sctp_m_freem(op_err);
5599                 return;
5600         }
5601         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5602         padding_len = 0;
5603
5604         /*
5605          * We might not overwrite the identification[] completely and on
5606          * some platforms time_entered will contain some padding. Therefore
5607          * zero out the cookie to avoid putting uninitialized memory on the
5608          * wire.
5609          */
5610         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5611
5612         /* the time I built cookie */
5613         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5614
5615         /* populate any tie tags */
5616         if (asoc != NULL) {
5617                 /* unlock before tag selections */
5618                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5619                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5620                 stc.cookie_life = asoc->cookie_life;
5621                 net = asoc->primary_destination;
5622         } else {
5623                 stc.tie_tag_my_vtag = 0;
5624                 stc.tie_tag_peer_vtag = 0;
5625                 /* life I will award this cookie */
5626                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5627         }
5628
5629         /* copy in the ports for later check */
5630         stc.myport = sh->dest_port;
5631         stc.peerport = sh->src_port;
5632
5633         /*
5634          * If we wanted to honor cookie life extensions, we would add to
5635          * stc.cookie_life. For now we should NOT honor any extension
5636          */
5637         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5638         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5639                 stc.ipv6_addr_legal = 1;
5640                 if (SCTP_IPV6_V6ONLY(inp)) {
5641                         stc.ipv4_addr_legal = 0;
5642                 } else {
5643                         stc.ipv4_addr_legal = 1;
5644                 }
5645         } else {
5646                 stc.ipv6_addr_legal = 0;
5647                 stc.ipv4_addr_legal = 1;
5648         }
5649         stc.ipv4_scope = 0;
5650         if (net == NULL) {
5651                 to = src;
5652                 switch (dst->sa_family) {
5653 #ifdef INET
5654                 case AF_INET:
5655                         {
5656                                 /* lookup address */
5657                                 stc.address[0] = src4->sin_addr.s_addr;
5658                                 stc.address[1] = 0;
5659                                 stc.address[2] = 0;
5660                                 stc.address[3] = 0;
5661                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5662                                 /* local from address */
5663                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5664                                 stc.laddress[1] = 0;
5665                                 stc.laddress[2] = 0;
5666                                 stc.laddress[3] = 0;
5667                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5668                                 /* scope_id is only for v6 */
5669                                 stc.scope_id = 0;
5670                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5671                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5672                                         stc.ipv4_scope = 1;
5673                                 }
5674                                 /* Must use the address in this case */
5675                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5676                                         stc.loopback_scope = 1;
5677                                         stc.ipv4_scope = 1;
5678                                         stc.site_scope = 1;
5679                                         stc.local_scope = 0;
5680                                 }
5681                                 break;
5682                         }
5683 #endif
5684 #ifdef INET6
5685                 case AF_INET6:
5686                         {
5687                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5688                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5689                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5690                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5691                                         stc.loopback_scope = 1;
5692                                         stc.local_scope = 0;
5693                                         stc.site_scope = 1;
5694                                         stc.ipv4_scope = 1;
5695                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5696                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5697                                         /*
5698                                          * If the new destination or source
5699                                          * is a LINK_LOCAL we must have
5700                                          * common both site and local scope.
5701                                          * Don't set local scope though
5702                                          * since we must depend on the
5703                                          * source to be added implicitly. We
5704                                          * cannot assure just because we
5705                                          * share one link that all links are
5706                                          * common.
5707                                          */
5708                                         stc.local_scope = 0;
5709                                         stc.site_scope = 1;
5710                                         stc.ipv4_scope = 1;
5711                                         /*
5712                                          * we start counting for the private
5713                                          * address stuff at 1. since the
5714                                          * link local we source from won't
5715                                          * show up in our scoped count.
5716                                          */
5717                                         cnt_inits_to = 1;
5718                                         /*
5719                                          * pull out the scope_id from
5720                                          * incoming pkt
5721                                          */
5722                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5723                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5724                                         /*
5725                                          * If the new destination or source
5726                                          * is SITE_LOCAL then we must have
5727                                          * site scope in common.
5728                                          */
5729                                         stc.site_scope = 1;
5730                                 }
5731                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5732                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5733                                 break;
5734                         }
5735 #endif
5736                 default:
5737                         /* TSNH */
5738                         goto do_a_abort;
5739                         break;
5740                 }
5741         } else {
5742                 /* set the scope per the existing tcb */
5743
5744 #ifdef INET6
5745                 struct sctp_nets *lnet;
5746
5747 #endif
5748
5749                 stc.loopback_scope = asoc->scope.loopback_scope;
5750                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5751                 stc.site_scope = asoc->scope.site_scope;
5752                 stc.local_scope = asoc->scope.local_scope;
5753 #ifdef INET6
5754                 /* Why do we not consider IPv4 LL addresses? */
5755                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5756                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5757                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5758                                         /*
5759                                          * if we have a LL address, start
5760                                          * counting at 1.
5761                                          */
5762                                         cnt_inits_to = 1;
5763                                 }
5764                         }
5765                 }
5766 #endif
5767                 /* use the net pointer */
5768                 to = (struct sockaddr *)&net->ro._l_addr;
5769                 switch (to->sa_family) {
5770 #ifdef INET
5771                 case AF_INET:
5772                         sin = (struct sockaddr_in *)to;
5773                         stc.address[0] = sin->sin_addr.s_addr;
5774                         stc.address[1] = 0;
5775                         stc.address[2] = 0;
5776                         stc.address[3] = 0;
5777                         stc.addr_type = SCTP_IPV4_ADDRESS;
5778                         if (net->src_addr_selected == 0) {
5779                                 /*
5780                                  * strange case here, the INIT should have
5781                                  * did the selection.
5782                                  */
5783                                 net->ro._s_addr = sctp_source_address_selection(inp,
5784                                     stcb, (sctp_route_t *) & net->ro,
5785                                     net, 0, vrf_id);
5786                                 if (net->ro._s_addr == NULL)
5787                                         return;
5788
5789                                 net->src_addr_selected = 1;
5790
5791                         }
5792                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5793                         stc.laddress[1] = 0;
5794                         stc.laddress[2] = 0;
5795                         stc.laddress[3] = 0;
5796                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5797                         /* scope_id is only for v6 */
5798                         stc.scope_id = 0;
5799                         break;
5800 #endif
5801 #ifdef INET6
5802                 case AF_INET6:
5803                         sin6 = (struct sockaddr_in6 *)to;
5804                         memcpy(&stc.address, &sin6->sin6_addr,
5805                             sizeof(struct in6_addr));
5806                         stc.addr_type = SCTP_IPV6_ADDRESS;
5807                         stc.scope_id = sin6->sin6_scope_id;
5808                         if (net->src_addr_selected == 0) {
5809                                 /*
5810                                  * strange case here, the INIT should have
5811                                  * done the selection.
5812                                  */
5813                                 net->ro._s_addr = sctp_source_address_selection(inp,
5814                                     stcb, (sctp_route_t *) & net->ro,
5815                                     net, 0, vrf_id);
5816                                 if (net->ro._s_addr == NULL)
5817                                         return;
5818
5819                                 net->src_addr_selected = 1;
5820                         }
5821                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5822                             sizeof(struct in6_addr));
5823                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5824                         break;
5825 #endif
5826                 }
5827         }
5828         /* Now lets put the SCTP header in place */
5829         initack = mtod(m, struct sctp_init_ack_chunk *);
5830         /* Save it off for quick ref */
5831         stc.peers_vtag = init_chk->init.initiate_tag;
5832         /* who are we */
5833         memcpy(stc.identification, SCTP_VERSION_STRING,
5834             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5835         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5836         /* now the chunk header */
5837         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5838         initack->ch.chunk_flags = 0;
5839         /* fill in later from mbuf we build */
5840         initack->ch.chunk_length = 0;
5841         /* place in my tag */
5842         if ((asoc != NULL) &&
5843             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5844             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5845             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5846                 /* re-use the v-tags and init-seq here */
5847                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5848                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5849         } else {
5850                 uint32_t vtag, itsn;
5851
5852                 if (hold_inp_lock) {
5853                         SCTP_INP_INCR_REF(inp);
5854                         SCTP_INP_RUNLOCK(inp);
5855                 }
5856                 if (asoc) {
5857                         atomic_add_int(&asoc->refcnt, 1);
5858                         SCTP_TCB_UNLOCK(stcb);
5859         new_tag:
5860                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5861                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5862                                 /*
5863                                  * Got a duplicate vtag on some guy behind a
5864                                  * nat make sure we don't use it.
5865                                  */
5866                                 goto new_tag;
5867                         }
5868                         initack->init.initiate_tag = htonl(vtag);
5869                         /* get a TSN to use too */
5870                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5871                         initack->init.initial_tsn = htonl(itsn);
5872                         SCTP_TCB_LOCK(stcb);
5873                         atomic_add_int(&asoc->refcnt, -1);
5874                 } else {
5875                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5876                         initack->init.initiate_tag = htonl(vtag);
5877                         /* get a TSN to use too */
5878                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5879                 }
5880                 if (hold_inp_lock) {
5881                         SCTP_INP_RLOCK(inp);
5882                         SCTP_INP_DECR_REF(inp);
5883                 }
5884         }
5885         /* save away my tag to */
5886         stc.my_vtag = initack->init.initiate_tag;
5887
5888         /* set up some of the credits. */
5889         so = inp->sctp_socket;
5890         if (so == NULL) {
5891                 /* memory problem */
5892                 sctp_m_freem(m);
5893                 return;
5894         } else {
5895                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5896         }
5897         /* set what I want */
5898         his_limit = ntohs(init_chk->init.num_inbound_streams);
5899         /* choose what I want */
5900         if (asoc != NULL) {
5901                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5902                         i_want = asoc->streamoutcnt;
5903                 } else {
5904                         i_want = asoc->pre_open_streams;
5905                 }
5906         } else {
5907                 i_want = inp->sctp_ep.pre_open_stream_count;
5908         }
5909         if (his_limit < i_want) {
5910                 /* I Want more :< */
5911                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5912         } else {
5913                 /* I can have what I want :> */
5914                 initack->init.num_outbound_streams = htons(i_want);
5915         }
5916         /* tell him his limit. */
5917         initack->init.num_inbound_streams =
5918             htons(inp->sctp_ep.max_open_streams_intome);
5919
5920         /* adaptation layer indication parameter */
5921         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5922                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5923                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5924                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5925                 ali->ph.param_length = htons(parameter_len);
5926                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5927                 chunk_len += parameter_len;
5928         }
5929         /* ECN parameter */
5930         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5931             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5932                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5933                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5934                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5935                 ph->param_length = htons(parameter_len);
5936                 chunk_len += parameter_len;
5937         }
5938         /* PR-SCTP supported parameter */
5939         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5940             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5941                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5942                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5943                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5944                 ph->param_length = htons(parameter_len);
5945                 chunk_len += parameter_len;
5946         }
5947         /* Add NAT friendly parameter */
5948         if (nat_friendly) {
5949                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5950                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5951                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5952                 ph->param_length = htons(parameter_len);
5953                 chunk_len += parameter_len;
5954         }
5955         /* And now tell the peer which extensions we support */
5956         num_ext = 0;
5957         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5958         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5959             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5960                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5961                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5962                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5963                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5964                 }
5965         }
5966         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5967             ((asoc == NULL) && (inp->auth_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5969         }
5970         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5971             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5973                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5974         }
5975         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5976             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5977                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5978         }
5979         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5980             ((asoc == NULL) && (inp->idata_supported == 1))) {
5981                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5982         }
5983         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5984             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5985                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5986         }
5987         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5988             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5989                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5990         }
5991         if (num_ext > 0) {
5992                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5993                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5994                 pr_supported->ph.param_length = htons(parameter_len);
5995                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5996                 chunk_len += parameter_len;
5997         }
5998         /* add authentication parameters */
5999         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6000             ((asoc == NULL) && (inp->auth_supported == 1))) {
6001                 struct sctp_auth_random *randp;
6002                 struct sctp_auth_hmac_algo *hmacs;
6003                 struct sctp_auth_chunk_list *chunks;
6004
6005                 if (padding_len > 0) {
6006                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6007                         chunk_len += padding_len;
6008                         padding_len = 0;
6009                 }
6010                 /* generate and add RANDOM parameter */
6011                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6012                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
6013                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6014                 randp->ph.param_type = htons(SCTP_RANDOM);
6015                 randp->ph.param_length = htons(parameter_len);
6016                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6017                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6018                 chunk_len += parameter_len;
6019
6020                 if (padding_len > 0) {
6021                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6022                         chunk_len += padding_len;
6023                         padding_len = 0;
6024                 }
6025                 /* add HMAC_ALGO parameter */
6026                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6027                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
6028                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6029                     (uint8_t *) hmacs->hmac_ids);
6030                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6031                 hmacs->ph.param_length = htons(parameter_len);
6032                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6033                 chunk_len += parameter_len;
6034
6035                 if (padding_len > 0) {
6036                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6037                         chunk_len += padding_len;
6038                         padding_len = 0;
6039                 }
6040                 /* add CHUNKS parameter */
6041                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6042                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6043                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6044                     chunks->chunk_types);
6045                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6046                 chunks->ph.param_length = htons(parameter_len);
6047                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6048                 chunk_len += parameter_len;
6049         }
6050         SCTP_BUF_LEN(m) = chunk_len;
6051         m_last = m;
6052         /* now the addresses */
6053         /*
6054          * To optimize this we could put the scoping stuff into a structure
6055          * and remove the individual uint8's from the stc structure. Then we
6056          * could just sifa in the address within the stc.. but for now this
6057          * is a quick hack to get the address stuff teased apart.
6058          */
6059         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6060         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6061         scp.loopback_scope = stc.loopback_scope;
6062         scp.ipv4_local_scope = stc.ipv4_scope;
6063         scp.local_scope = stc.local_scope;
6064         scp.site_scope = stc.site_scope;
6065         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6066             cnt_inits_to,
6067             &padding_len, &chunk_len);
6068         /* padding_len can only be positive, if no addresses have been added */
6069         if (padding_len > 0) {
6070                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6071                 chunk_len += padding_len;
6072                 SCTP_BUF_LEN(m) += padding_len;
6073                 padding_len = 0;
6074         }
6075         /* tack on the operational error if present */
6076         if (op_err) {
6077                 parameter_len = 0;
6078                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6079                         parameter_len += SCTP_BUF_LEN(m_tmp);
6080                 }
6081                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6082                 SCTP_BUF_NEXT(m_last) = op_err;
6083                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6084                         m_last = SCTP_BUF_NEXT(m_last);
6085                 }
6086                 chunk_len += parameter_len;
6087         }
6088         if (padding_len > 0) {
6089                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6090                 if (m_last == NULL) {
6091                         /* Houston we have a problem, no space */
6092                         sctp_m_freem(m);
6093                         return;
6094                 }
6095                 chunk_len += padding_len;
6096                 padding_len = 0;
6097         }
6098         /* Now we must build a cookie */
6099         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6100         if (m_cookie == NULL) {
6101                 /* memory problem */
6102                 sctp_m_freem(m);
6103                 return;
6104         }
6105         /* Now append the cookie to the end and update the space/size */
6106         SCTP_BUF_NEXT(m_last) = m_cookie;
6107         parameter_len = 0;
6108         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6109                 parameter_len += SCTP_BUF_LEN(m_tmp);
6110                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6111                         m_last = m_tmp;
6112                 }
6113         }
6114         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6115         chunk_len += parameter_len;
6116
6117         /*
6118          * Place in the size, but we don't include the last pad (if any) in
6119          * the INIT-ACK.
6120          */
6121         initack->ch.chunk_length = htons(chunk_len);
6122
6123         /*
6124          * Time to sign the cookie, we don't sign over the cookie signature
6125          * though thus we set trailer.
6126          */
6127         (void)sctp_hmac_m(SCTP_HMAC,
6128             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6129             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6130             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6131         /*
6132          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6133          * here since the timer will drive a retranmission.
6134          */
6135         if (padding_len > 0) {
6136                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6137                         sctp_m_freem(m);
6138                         return;
6139                 }
6140         }
6141         if (stc.loopback_scope) {
6142                 over_addr = (union sctp_sockstore *)dst;
6143         } else {
6144                 over_addr = NULL;
6145         }
6146
6147         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6148             0, 0,
6149             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6150             port, over_addr,
6151             mflowtype, mflowid,
6152             SCTP_SO_NOT_LOCKED);
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         if (stcb->asoc.idata_supported) {
6255                 ovh += sizeof(struct sctp_idata_chunk);
6256         } else {
6257                 ovh += sizeof(struct sctp_data_chunk);
6258         }
6259         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6260                 siz = asoc->smallest_mtu - ovh;
6261         else
6262                 siz = (stcb->asoc.sctp_frag_point - ovh);
6263         /*
6264          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6265          */
6266         /* A data chunk MUST fit in a cluster */
6267         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6268         /* } */
6269
6270         /* adjust for an AUTH chunk if DATA requires auth */
6271         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6272                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6273
6274         if (siz % 4) {
6275                 /* make it an even word boundary please */
6276                 siz -= (siz % 4);
6277         }
6278         return (siz);
6279 }
6280
6281 static void
6282 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6283 {
6284         /*
6285          * We assume that the user wants PR_SCTP_TTL if the user provides a
6286          * positive lifetime but does not specify any PR_SCTP policy.
6287          */
6288         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6289                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6290         } else if (sp->timetolive > 0) {
6291                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6292                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6293         } else {
6294                 return;
6295         }
6296         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6297         case CHUNK_FLAGS_PR_SCTP_BUF:
6298                 /*
6299                  * Time to live is a priority stored in tv_sec when doing
6300                  * the buffer drop thing.
6301                  */
6302                 sp->ts.tv_sec = sp->timetolive;
6303                 sp->ts.tv_usec = 0;
6304                 break;
6305         case CHUNK_FLAGS_PR_SCTP_TTL:
6306                 {
6307                         struct timeval tv;
6308
6309                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6310                         tv.tv_sec = sp->timetolive / 1000;
6311                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6312                         /*
6313                          * TODO sctp_constants.h needs alternative time
6314                          * macros when _KERNEL is undefined.
6315                          */
6316                         timevaladd(&sp->ts, &tv);
6317                 }
6318                 break;
6319         case CHUNK_FLAGS_PR_SCTP_RTX:
6320                 /*
6321                  * Time to live is a the number or retransmissions stored in
6322                  * tv_sec.
6323                  */
6324                 sp->ts.tv_sec = sp->timetolive;
6325                 sp->ts.tv_usec = 0;
6326                 break;
6327         default:
6328                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6329                     "Unknown PR_SCTP policy %u.\n",
6330                     PR_SCTP_POLICY(sp->sinfo_flags));
6331                 break;
6332         }
6333 }
6334
6335 static int
6336 sctp_msg_append(struct sctp_tcb *stcb,
6337     struct sctp_nets *net,
6338     struct mbuf *m,
6339     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6340 {
6341         int error = 0;
6342         struct mbuf *at;
6343         struct sctp_stream_queue_pending *sp = NULL;
6344         struct sctp_stream_out *strm;
6345
6346         /*
6347          * Given an mbuf chain, put it into the association send queue and
6348          * place it on the wheel
6349          */
6350         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6351                 /* Invalid stream number */
6352                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6353                 error = EINVAL;
6354                 goto out_now;
6355         }
6356         if ((stcb->asoc.stream_locked) &&
6357             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6358                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6359                 error = EINVAL;
6360                 goto out_now;
6361         }
6362         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6363         /* Now can we send this? */
6364         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6365             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6366             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6367             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6368                 /* got data while shutting down */
6369                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6370                 error = ECONNRESET;
6371                 goto out_now;
6372         }
6373         sctp_alloc_a_strmoq(stcb, sp);
6374         if (sp == NULL) {
6375                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6376                 error = ENOMEM;
6377                 goto out_now;
6378         }
6379         sp->sinfo_flags = srcv->sinfo_flags;
6380         sp->timetolive = srcv->sinfo_timetolive;
6381         sp->ppid = srcv->sinfo_ppid;
6382         sp->context = srcv->sinfo_context;
6383         sp->fsn = 0;
6384         sp->msg_id = atomic_fetchadd_int(&stcb->asoc.assoc_msg_id, 1);
6385         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6386                 sp->net = net;
6387                 atomic_add_int(&sp->net->ref_count, 1);
6388         } else {
6389                 sp->net = NULL;
6390         }
6391         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6392         sp->stream = srcv->sinfo_stream;
6393         sp->msg_is_complete = 1;
6394         sp->sender_all_done = 1;
6395         sp->some_taken = 0;
6396         sp->data = m;
6397         sp->tail_mbuf = NULL;
6398         sctp_set_prsctp_policy(sp);
6399         /*
6400          * We could in theory (for sendall) sifa the length in, but we would
6401          * still have to hunt through the chain since we need to setup the
6402          * tail_mbuf
6403          */
6404         sp->length = 0;
6405         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6406                 if (SCTP_BUF_NEXT(at) == NULL)
6407                         sp->tail_mbuf = at;
6408                 sp->length += SCTP_BUF_LEN(at);
6409         }
6410         if (srcv->sinfo_keynumber_valid) {
6411                 sp->auth_keyid = srcv->sinfo_keynumber;
6412         } else {
6413                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6414         }
6415         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6416                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6417                 sp->holds_key_ref = 1;
6418         }
6419         if (hold_stcb_lock == 0) {
6420                 SCTP_TCB_SEND_LOCK(stcb);
6421         }
6422         sctp_snd_sb_alloc(stcb, sp->length);
6423         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6424         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6425         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6426         m = NULL;
6427         if (hold_stcb_lock == 0) {
6428                 SCTP_TCB_SEND_UNLOCK(stcb);
6429         }
6430 out_now:
6431         if (m) {
6432                 sctp_m_freem(m);
6433         }
6434         return (error);
6435 }
6436
6437
6438 static struct mbuf *
6439 sctp_copy_mbufchain(struct mbuf *clonechain,
6440     struct mbuf *outchain,
6441     struct mbuf **endofchain,
6442     int can_take_mbuf,
6443     int sizeofcpy,
6444     uint8_t copy_by_ref)
6445 {
6446         struct mbuf *m;
6447         struct mbuf *appendchain;
6448         caddr_t cp;
6449         int len;
6450
6451         if (endofchain == NULL) {
6452                 /* error */
6453 error_out:
6454                 if (outchain)
6455                         sctp_m_freem(outchain);
6456                 return (NULL);
6457         }
6458         if (can_take_mbuf) {
6459                 appendchain = clonechain;
6460         } else {
6461                 if (!copy_by_ref &&
6462                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6463                     ) {
6464                         /* Its not in a cluster */
6465                         if (*endofchain == NULL) {
6466                                 /* lets get a mbuf cluster */
6467                                 if (outchain == NULL) {
6468                                         /* This is the general case */
6469                         new_mbuf:
6470                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6471                                         if (outchain == NULL) {
6472                                                 goto error_out;
6473                                         }
6474                                         SCTP_BUF_LEN(outchain) = 0;
6475                                         *endofchain = outchain;
6476                                         /* get the prepend space */
6477                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6478                                 } else {
6479                                         /*
6480                                          * We really should not get a NULL
6481                                          * in endofchain
6482                                          */
6483                                         /* find end */
6484                                         m = outchain;
6485                                         while (m) {
6486                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6487                                                         *endofchain = m;
6488                                                         break;
6489                                                 }
6490                                                 m = SCTP_BUF_NEXT(m);
6491                                         }
6492                                         /* sanity */
6493                                         if (*endofchain == NULL) {
6494                                                 /*
6495                                                  * huh, TSNH XXX maybe we
6496                                                  * should panic
6497                                                  */
6498                                                 sctp_m_freem(outchain);
6499                                                 goto new_mbuf;
6500                                         }
6501                                 }
6502                                 /* get the new end of length */
6503                                 len = (int)M_TRAILINGSPACE(*endofchain);
6504                         } else {
6505                                 /* how much is left at the end? */
6506                                 len = (int)M_TRAILINGSPACE(*endofchain);
6507                         }
6508                         /* Find the end of the data, for appending */
6509                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6510
6511                         /* Now lets copy it out */
6512                         if (len >= sizeofcpy) {
6513                                 /* It all fits, copy it in */
6514                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6515                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6516                         } else {
6517                                 /* fill up the end of the chain */
6518                                 if (len > 0) {
6519                                         m_copydata(clonechain, 0, len, cp);
6520                                         SCTP_BUF_LEN((*endofchain)) += len;
6521                                         /* now we need another one */
6522                                         sizeofcpy -= len;
6523                                 }
6524                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6525                                 if (m == NULL) {
6526                                         /* We failed */
6527                                         goto error_out;
6528                                 }
6529                                 SCTP_BUF_NEXT((*endofchain)) = m;
6530                                 *endofchain = m;
6531                                 cp = mtod((*endofchain), caddr_t);
6532                                 m_copydata(clonechain, len, sizeofcpy, cp);
6533                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6534                         }
6535                         return (outchain);
6536                 } else {
6537                         /* copy the old fashion way */
6538                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6539 #ifdef SCTP_MBUF_LOGGING
6540                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6541                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6542                         }
6543 #endif
6544                 }
6545         }
6546         if (appendchain == NULL) {
6547                 /* error */
6548                 if (outchain)
6549                         sctp_m_freem(outchain);
6550                 return (NULL);
6551         }
6552         if (outchain) {
6553                 /* tack on to the end */
6554                 if (*endofchain != NULL) {
6555                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6556                 } else {
6557                         m = outchain;
6558                         while (m) {
6559                                 if (SCTP_BUF_NEXT(m) == NULL) {
6560                                         SCTP_BUF_NEXT(m) = appendchain;
6561                                         break;
6562                                 }
6563                                 m = SCTP_BUF_NEXT(m);
6564                         }
6565                 }
6566                 /*
6567                  * save off the end and update the end-chain position
6568                  */
6569                 m = appendchain;
6570                 while (m) {
6571                         if (SCTP_BUF_NEXT(m) == NULL) {
6572                                 *endofchain = m;
6573                                 break;
6574                         }
6575                         m = SCTP_BUF_NEXT(m);
6576                 }
6577                 return (outchain);
6578         } else {
6579                 /* save off the end and update the end-chain position */
6580                 m = appendchain;
6581                 while (m) {
6582                         if (SCTP_BUF_NEXT(m) == NULL) {
6583                                 *endofchain = m;
6584                                 break;
6585                         }
6586                         m = SCTP_BUF_NEXT(m);
6587                 }
6588                 return (appendchain);
6589         }
6590 }
6591
6592 static int
6593 sctp_med_chunk_output(struct sctp_inpcb *inp,
6594     struct sctp_tcb *stcb,
6595     struct sctp_association *asoc,
6596     int *num_out,
6597     int *reason_code,
6598     int control_only, int from_where,
6599     struct timeval *now, int *now_filled, int frag_point, int so_locked
6600 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6601     SCTP_UNUSED
6602 #endif
6603 );
6604
6605 static void
6606 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6607     uint32_t val SCTP_UNUSED)
6608 {
6609         struct sctp_copy_all *ca;
6610         struct mbuf *m;
6611         int ret = 0;
6612         int added_control = 0;
6613         int un_sent, do_chunk_output = 1;
6614         struct sctp_association *asoc;
6615         struct sctp_nets *net;
6616
6617         ca = (struct sctp_copy_all *)ptr;
6618         if (ca->m == NULL) {
6619                 return;
6620         }
6621         if (ca->inp != inp) {
6622                 /* TSNH */
6623                 return;
6624         }
6625         if (ca->sndlen > 0) {
6626                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6627                 if (m == NULL) {
6628                         /* can't copy so we are done */
6629                         ca->cnt_failed++;
6630                         return;
6631                 }
6632 #ifdef SCTP_MBUF_LOGGING
6633                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6634                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6635                 }
6636 #endif
6637         } else {
6638                 m = NULL;
6639         }
6640         SCTP_TCB_LOCK_ASSERT(stcb);
6641         if (stcb->asoc.alternate) {
6642                 net = stcb->asoc.alternate;
6643         } else {
6644                 net = stcb->asoc.primary_destination;
6645         }
6646         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6647                 /* Abort this assoc with m as the user defined reason */
6648                 if (m != NULL) {
6649                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6650                 } else {
6651                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6652                             0, M_NOWAIT, 1, MT_DATA);
6653                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6654                 }
6655                 if (m != NULL) {
6656                         struct sctp_paramhdr *ph;
6657
6658                         ph = mtod(m, struct sctp_paramhdr *);
6659                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6660                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + ca->sndlen));
6661                 }
6662                 /*
6663                  * We add one here to keep the assoc from dis-appearing on
6664                  * us.
6665                  */
6666                 atomic_add_int(&stcb->asoc.refcnt, 1);
6667                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6668                 /*
6669                  * sctp_abort_an_association calls sctp_free_asoc() free
6670                  * association will NOT free it since we incremented the
6671                  * refcnt .. we do this to prevent it being freed and things
6672                  * getting tricky since we could end up (from free_asoc)
6673                  * calling inpcb_free which would get a recursive lock call
6674                  * to the iterator lock.. But as a consequence of that the
6675                  * stcb will return to us un-locked.. since free_asoc
6676                  * returns with either no TCB or the TCB unlocked, we must
6677                  * relock.. to unlock in the iterator timer :-0
6678                  */
6679                 SCTP_TCB_LOCK(stcb);
6680                 atomic_add_int(&stcb->asoc.refcnt, -1);
6681                 goto no_chunk_output;
6682         } else {
6683                 if (m) {
6684                         ret = sctp_msg_append(stcb, net, m,
6685                             &ca->sndrcv, 1);
6686                 }
6687                 asoc = &stcb->asoc;
6688                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6689                         /* shutdown this assoc */
6690                         int cnt;
6691
6692                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6693
6694                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6695                             TAILQ_EMPTY(&asoc->sent_queue) &&
6696                             (cnt == 0)) {
6697                                 if (asoc->locked_on_sending) {
6698                                         goto abort_anyway;
6699                                 }
6700                                 /*
6701                                  * there is nothing queued to send, so I'm
6702                                  * done...
6703                                  */
6704                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6705                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6706                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6707                                         /*
6708                                          * only send SHUTDOWN the first time
6709                                          * through
6710                                          */
6711                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6712                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6713                                         }
6714                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6715                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6716                                         sctp_stop_timers_for_shutdown(stcb);
6717                                         sctp_send_shutdown(stcb, net);
6718                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6719                                             net);
6720                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6721                                             asoc->primary_destination);
6722                                         added_control = 1;
6723                                         do_chunk_output = 0;
6724                                 }
6725                         } else {
6726                                 /*
6727                                  * we still got (or just got) data to send,
6728                                  * so set SHUTDOWN_PENDING
6729                                  */
6730                                 /*
6731                                  * XXX sockets draft says that SCTP_EOF
6732                                  * should be sent with no data.  currently,
6733                                  * we will allow user data to be sent first
6734                                  * and move to SHUTDOWN-PENDING
6735                                  */
6736                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6737                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6738                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6739                                         if (asoc->locked_on_sending) {
6740                                                 /*
6741                                                  * Locked to send out the
6742                                                  * data
6743                                                  */
6744                                                 struct sctp_stream_queue_pending *sp;
6745
6746                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6747                                                 if (sp) {
6748                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6749                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6750                                                 }
6751                                         }
6752                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6753                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6754                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6755                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6756                                                 struct mbuf *op_err;
6757                                                 char msg[SCTP_DIAG_INFO_LEN];
6758
6759                                 abort_anyway:
6760                                                 snprintf(msg, sizeof(msg),
6761                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6762                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6763                                                     msg);
6764                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6765                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6766                                                     op_err, SCTP_SO_NOT_LOCKED);
6767                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6768                                                 goto no_chunk_output;
6769                                         }
6770                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6771                                             asoc->primary_destination);
6772                                 }
6773                         }
6774
6775                 }
6776         }
6777         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6778             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6779
6780         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6781             (stcb->asoc.total_flight > 0) &&
6782             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6783                 do_chunk_output = 0;
6784         }
6785         if (do_chunk_output)
6786                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6787         else if (added_control) {
6788                 int num_out, reason, now_filled = 0;
6789                 struct timeval now;
6790                 int frag_point;
6791
6792                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6793                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6794                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6795         }
6796 no_chunk_output:
6797         if (ret) {
6798                 ca->cnt_failed++;
6799         } else {
6800                 ca->cnt_sent++;
6801         }
6802 }
6803
6804 static void
6805 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6806 {
6807         struct sctp_copy_all *ca;
6808
6809         ca = (struct sctp_copy_all *)ptr;
6810         /*
6811          * Do a notify here? Kacheong suggests that the notify be done at
6812          * the send time.. so you would push up a notification if any send
6813          * failed. Don't know if this is feasible since the only failures we
6814          * have is "memory" related and if you cannot get an mbuf to send
6815          * the data you surely can't get an mbuf to send up to notify the
6816          * user you can't send the data :->
6817          */
6818
6819         /* now free everything */
6820         sctp_m_freem(ca->m);
6821         SCTP_FREE(ca, SCTP_M_COPYAL);
6822 }
6823
6824 static struct mbuf *
6825 sctp_copy_out_all(struct uio *uio, int len)
6826 {
6827         struct mbuf *ret, *at;
6828         int left, willcpy, cancpy, error;
6829
6830         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6831         if (ret == NULL) {
6832                 /* TSNH */
6833                 return (NULL);
6834         }
6835         left = len;
6836         SCTP_BUF_LEN(ret) = 0;
6837         /* save space for the data chunk header */
6838         cancpy = (int)M_TRAILINGSPACE(ret);
6839         willcpy = min(cancpy, left);
6840         at = ret;
6841         while (left > 0) {
6842                 /* Align data to the end */
6843                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6844                 if (error) {
6845         err_out_now:
6846                         sctp_m_freem(at);
6847                         return (NULL);
6848                 }
6849                 SCTP_BUF_LEN(at) = willcpy;
6850                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6851                 left -= willcpy;
6852                 if (left > 0) {
6853                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6854                         if (SCTP_BUF_NEXT(at) == NULL) {
6855                                 goto err_out_now;
6856                         }
6857                         at = SCTP_BUF_NEXT(at);
6858                         SCTP_BUF_LEN(at) = 0;
6859                         cancpy = (int)M_TRAILINGSPACE(at);
6860                         willcpy = min(cancpy, left);
6861                 }
6862         }
6863         return (ret);
6864 }
6865
6866 static int
6867 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6868     struct sctp_sndrcvinfo *srcv)
6869 {
6870         int ret;
6871         struct sctp_copy_all *ca;
6872
6873         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6874             SCTP_M_COPYAL);
6875         if (ca == NULL) {
6876                 sctp_m_freem(m);
6877                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6878                 return (ENOMEM);
6879         }
6880         memset(ca, 0, sizeof(struct sctp_copy_all));
6881
6882         ca->inp = inp;
6883         if (srcv) {
6884                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6885         }
6886         /*
6887          * take off the sendall flag, it would be bad if we failed to do
6888          * this :-0
6889          */
6890         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6891         /* get length and mbuf chain */
6892         if (uio) {
6893                 ca->sndlen = (int)uio->uio_resid;
6894                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6895                 if (ca->m == NULL) {
6896                         SCTP_FREE(ca, SCTP_M_COPYAL);
6897                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6898                         return (ENOMEM);
6899                 }
6900         } else {
6901                 /* Gather the length of the send */
6902                 struct mbuf *mat;
6903
6904                 ca->sndlen = 0;
6905                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6906                         ca->sndlen += SCTP_BUF_LEN(mat);
6907                 }
6908         }
6909         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6910             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6911             SCTP_ASOC_ANY_STATE,
6912             (void *)ca, 0,
6913             sctp_sendall_completes, inp, 1);
6914         if (ret) {
6915                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6916                 SCTP_FREE(ca, SCTP_M_COPYAL);
6917                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6918                 return (EFAULT);
6919         }
6920         return (0);
6921 }
6922
6923
6924 void
6925 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6926 {
6927         struct sctp_tmit_chunk *chk, *nchk;
6928
6929         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6930                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6931                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6932                         if (chk->data) {
6933                                 sctp_m_freem(chk->data);
6934                                 chk->data = NULL;
6935                         }
6936                         asoc->ctrl_queue_cnt--;
6937                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6938                 }
6939         }
6940 }
6941
6942 void
6943 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6944 {
6945         struct sctp_association *asoc;
6946         struct sctp_tmit_chunk *chk, *nchk;
6947         struct sctp_asconf_chunk *acp;
6948
6949         asoc = &stcb->asoc;
6950         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6951                 /* find SCTP_ASCONF chunk in queue */
6952                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6953                         if (chk->data) {
6954                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6955                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6956                                         /* Not Acked yet */
6957                                         break;
6958                                 }
6959                         }
6960                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6961                         if (chk->data) {
6962                                 sctp_m_freem(chk->data);
6963                                 chk->data = NULL;
6964                         }
6965                         asoc->ctrl_queue_cnt--;
6966                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6967                 }
6968         }
6969 }
6970
6971
6972 static void
6973 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6974     struct sctp_association *asoc,
6975     struct sctp_tmit_chunk **data_list,
6976     int bundle_at,
6977     struct sctp_nets *net)
6978 {
6979         int i;
6980         struct sctp_tmit_chunk *tp1;
6981
6982         for (i = 0; i < bundle_at; i++) {
6983                 /* off of the send queue */
6984                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6985                 asoc->send_queue_cnt--;
6986                 if (i > 0) {
6987                         /*
6988                          * Any chunk NOT 0 you zap the time chunk 0 gets
6989                          * zapped or set based on if a RTO measurment is
6990                          * needed.
6991                          */
6992                         data_list[i]->do_rtt = 0;
6993                 }
6994                 /* record time */
6995                 data_list[i]->sent_rcv_time = net->last_sent_time;
6996                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6997                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6998                 if (data_list[i]->whoTo == NULL) {
6999                         data_list[i]->whoTo = net;
7000                         atomic_add_int(&net->ref_count, 1);
7001                 }
7002                 /* on to the sent queue */
7003                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7004                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
7005                         struct sctp_tmit_chunk *tpp;
7006
7007                         /* need to move back */
7008         back_up_more:
7009                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7010                         if (tpp == NULL) {
7011                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7012                                 goto all_done;
7013                         }
7014                         tp1 = tpp;
7015                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
7016                                 goto back_up_more;
7017                         }
7018                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7019                 } else {
7020                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7021                             data_list[i],
7022                             sctp_next);
7023                 }
7024 all_done:
7025                 /* This does not lower until the cum-ack passes it */
7026                 asoc->sent_queue_cnt++;
7027                 if ((asoc->peers_rwnd <= 0) &&
7028                     (asoc->total_flight == 0) &&
7029                     (bundle_at == 1)) {
7030                         /* Mark the chunk as being a window probe */
7031                         SCTP_STAT_INCR(sctps_windowprobed);
7032                 }
7033 #ifdef SCTP_AUDITING_ENABLED
7034                 sctp_audit_log(0xC2, 3);
7035 #endif
7036                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7037                 data_list[i]->snd_count = 1;
7038                 data_list[i]->rec.data.chunk_was_revoked = 0;
7039                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7040                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7041                             data_list[i]->whoTo->flight_size,
7042                             data_list[i]->book_size,
7043                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
7044                             data_list[i]->rec.data.TSN_seq);
7045                 }
7046                 sctp_flight_size_increase(data_list[i]);
7047                 sctp_total_flight_increase(stcb, data_list[i]);
7048                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7049                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7050                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7051                 }
7052                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7053                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7054                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7055                         /* SWS sender side engages */
7056                         asoc->peers_rwnd = 0;
7057                 }
7058         }
7059         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7060                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7061         }
7062 }
7063
7064 static void
7065 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7066 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7067     SCTP_UNUSED
7068 #endif
7069 )
7070 {
7071         struct sctp_tmit_chunk *chk, *nchk;
7072
7073         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7074                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7075                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7076                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7077                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7078                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7079                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7080                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7081                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7082                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7083                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7084                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7085                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7086                         /* Stray chunks must be cleaned up */
7087         clean_up_anyway:
7088                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7089                         if (chk->data) {
7090                                 sctp_m_freem(chk->data);
7091                                 chk->data = NULL;
7092                         }
7093                         asoc->ctrl_queue_cnt--;
7094                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7095                                 asoc->fwd_tsn_cnt--;
7096                         sctp_free_a_chunk(stcb, chk, so_locked);
7097                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7098                         /* special handling, we must look into the param */
7099                         if (chk != asoc->str_reset) {
7100                                 goto clean_up_anyway;
7101                         }
7102                 }
7103         }
7104 }
7105
7106
7107 static int
7108 sctp_can_we_split_this(struct sctp_tcb *stcb,
7109     uint32_t length,
7110     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7111 {
7112         /*
7113          * Make a decision on if I should split a msg into multiple parts.
7114          * This is only asked of incomplete messages.
7115          */
7116         if (eeor_on) {
7117                 /*
7118                  * If we are doing EEOR we need to always send it if its the
7119                  * entire thing, since it might be all the guy is putting in
7120                  * the hopper.
7121                  */
7122                 if (goal_mtu >= length) {
7123                         /*-
7124                          * If we have data outstanding,
7125                          * we get another chance when the sack
7126                          * arrives to transmit - wait for more data
7127                          */
7128                         if (stcb->asoc.total_flight == 0) {
7129                                 /*
7130                                  * If nothing is in flight, we zero the
7131                                  * packet counter.
7132                                  */
7133                                 return (length);
7134                         }
7135                         return (0);
7136
7137                 } else {
7138                         /* You can fill the rest */
7139                         return (goal_mtu);
7140                 }
7141         }
7142         /*-
7143          * For those strange folk that make the send buffer
7144          * smaller than our fragmentation point, we can't
7145          * get a full msg in so we have to allow splitting.
7146          */
7147         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7148                 return (length);
7149         }
7150         if ((length <= goal_mtu) ||
7151             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7152                 /* Sub-optimial residual don't split in non-eeor mode. */
7153                 return (0);
7154         }
7155         /*
7156          * If we reach here length is larger than the goal_mtu. Do we wish
7157          * to split it for the sake of packet putting together?
7158          */
7159         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7160                 /* Its ok to split it */
7161                 return (min(goal_mtu, frag_point));
7162         }
7163         /* Nope, can't split */
7164         return (0);
7165
7166 }
7167
7168 static uint32_t
7169 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7170     struct sctp_stream_out *strq,
7171     uint32_t goal_mtu,
7172     uint32_t frag_point,
7173     int *locked,
7174     int *giveup,
7175     int eeor_mode,
7176     int *bail,
7177     int so_locked
7178 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7179     SCTP_UNUSED
7180 #endif
7181 )
7182 {
7183         /* Move from the stream to the send_queue keeping track of the total */
7184         struct sctp_association *asoc;
7185         struct sctp_stream_queue_pending *sp;
7186         struct sctp_tmit_chunk *chk;
7187         struct sctp_data_chunk *dchkh = NULL;
7188         struct sctp_idata_chunk *ndchkh = NULL;
7189         uint32_t to_move, length;
7190         int leading;
7191         uint8_t rcv_flags = 0;
7192         uint8_t some_taken;
7193         uint8_t send_lock_up = 0;
7194
7195         SCTP_TCB_LOCK_ASSERT(stcb);
7196         asoc = &stcb->asoc;
7197 one_more_time:
7198         /* sa_ignore FREED_MEMORY */
7199         *locked = 0;
7200         sp = TAILQ_FIRST(&strq->outqueue);
7201         if (sp == NULL) {
7202                 *locked = 0;
7203                 if (send_lock_up == 0) {
7204                         SCTP_TCB_SEND_LOCK(stcb);
7205                         send_lock_up = 1;
7206                 }
7207                 sp = TAILQ_FIRST(&strq->outqueue);
7208                 if (sp) {
7209                         goto one_more_time;
7210                 }
7211                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7212                     (stcb->asoc.idata_supported == 0) &&
7213                     (strq->last_msg_incomplete)) {
7214                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7215                             strq->stream_no,
7216                             strq->last_msg_incomplete);
7217                         strq->last_msg_incomplete = 0;
7218                 }
7219                 to_move = 0;
7220                 if (send_lock_up) {
7221                         SCTP_TCB_SEND_UNLOCK(stcb);
7222                         send_lock_up = 0;
7223                 }
7224                 goto out_of;
7225         }
7226         if ((sp->msg_is_complete) && (sp->length == 0)) {
7227                 if (sp->sender_all_done) {
7228                         /*
7229                          * We are doing differed cleanup. Last time through
7230                          * when we took all the data the sender_all_done was
7231                          * not set.
7232                          */
7233                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7234                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7235                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7236                                     sp->sender_all_done,
7237                                     sp->length,
7238                                     sp->msg_is_complete,
7239                                     sp->put_last_out,
7240                                     send_lock_up);
7241                         }
7242                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7243                                 SCTP_TCB_SEND_LOCK(stcb);
7244                                 send_lock_up = 1;
7245                         }
7246                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7247                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7248                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7249                             (strq->chunks_on_queues == 0) &&
7250                             TAILQ_EMPTY(&strq->outqueue)) {
7251                                 stcb->asoc.trigger_reset = 1;
7252                         }
7253                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7254                         if (sp->net) {
7255                                 sctp_free_remote_addr(sp->net);
7256                                 sp->net = NULL;
7257                         }
7258                         if (sp->data) {
7259                                 sctp_m_freem(sp->data);
7260                                 sp->data = NULL;
7261                         }
7262                         sctp_free_a_strmoq(stcb, sp, so_locked);
7263                         /* we can't be locked to it */
7264                         *locked = 0;
7265                         stcb->asoc.locked_on_sending = NULL;
7266                         if (send_lock_up) {
7267                                 SCTP_TCB_SEND_UNLOCK(stcb);
7268                                 send_lock_up = 0;
7269                         }
7270                         /* back to get the next msg */
7271                         goto one_more_time;
7272                 } else {
7273                         /*
7274                          * sender just finished this but still holds a
7275                          * reference
7276                          */
7277                         if (stcb->asoc.idata_supported == 0)
7278                                 *locked = 1;
7279                         *giveup = 1;
7280                         to_move = 0;
7281                         goto out_of;
7282                 }
7283         } else {
7284                 /* is there some to get */
7285                 if (sp->length == 0) {
7286                         /* no */
7287                         if (stcb->asoc.idata_supported == 0)
7288                                 *locked = 1;
7289                         *giveup = 1;
7290                         to_move = 0;
7291                         goto out_of;
7292                 } else if (sp->discard_rest) {
7293                         if (send_lock_up == 0) {
7294                                 SCTP_TCB_SEND_LOCK(stcb);
7295                                 send_lock_up = 1;
7296                         }
7297                         /* Whack down the size */
7298                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7299                         if ((stcb->sctp_socket != NULL) &&
7300                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7301                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7302                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7303                         }
7304                         if (sp->data) {
7305                                 sctp_m_freem(sp->data);
7306                                 sp->data = NULL;
7307                                 sp->tail_mbuf = NULL;
7308                         }
7309                         sp->length = 0;
7310                         sp->some_taken = 1;
7311                         if (stcb->asoc.idata_supported == 0)
7312                                 *locked = 1;
7313                         *giveup = 1;
7314                         to_move = 0;
7315                         goto out_of;
7316                 }
7317         }
7318         some_taken = sp->some_taken;
7319 re_look:
7320         length = sp->length;
7321         if (sp->msg_is_complete) {
7322                 /* The message is complete */
7323                 to_move = min(length, frag_point);
7324                 if (to_move == length) {
7325                         /* All of it fits in the MTU */
7326                         if (sp->some_taken) {
7327                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7328                                 sp->put_last_out = 1;
7329                         } else {
7330                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7331                                 sp->put_last_out = 1;
7332                         }
7333                 } else {
7334                         /* Not all of it fits, we fragment */
7335                         if (sp->some_taken == 0) {
7336                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7337                         }
7338                         sp->some_taken = 1;
7339                 }
7340         } else {
7341                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7342                 if (to_move) {
7343                         /*-
7344                          * We use a snapshot of length in case it
7345                          * is expanding during the compare.
7346                          */
7347                         uint32_t llen;
7348
7349                         llen = length;
7350                         if (to_move >= llen) {
7351                                 to_move = llen;
7352                                 if (send_lock_up == 0) {
7353                                         /*-
7354                                          * We are taking all of an incomplete msg
7355                                          * thus we need a send lock.
7356                                          */
7357                                         SCTP_TCB_SEND_LOCK(stcb);
7358                                         send_lock_up = 1;
7359                                         if (sp->msg_is_complete) {
7360                                                 /*
7361                                                  * the sender finished the
7362                                                  * msg
7363                                                  */
7364                                                 goto re_look;
7365                                         }
7366                                 }
7367                         }
7368                         if (sp->some_taken == 0) {
7369                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7370                                 sp->some_taken = 1;
7371                         }
7372                 } else {
7373                         /* Nothing to take. */
7374                         if ((sp->some_taken) &&
7375                             (stcb->asoc.idata_supported == 0)) {
7376                                 *locked = 1;
7377                         }
7378                         *giveup = 1;
7379                         to_move = 0;
7380                         goto out_of;
7381                 }
7382         }
7383
7384         /* If we reach here, we can copy out a chunk */
7385         sctp_alloc_a_chunk(stcb, chk);
7386         if (chk == NULL) {
7387                 /* No chunk memory */
7388                 *giveup = 1;
7389                 to_move = 0;
7390                 goto out_of;
7391         }
7392         /*
7393          * Setup for unordered if needed by looking at the user sent info
7394          * flags.
7395          */
7396         if (sp->sinfo_flags & SCTP_UNORDERED) {
7397                 rcv_flags |= SCTP_DATA_UNORDERED;
7398         }
7399         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7400             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7401                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7402         }
7403         /* clear out the chunk before setting up */
7404         memset(chk, 0, sizeof(*chk));
7405         chk->rec.data.rcv_flags = rcv_flags;
7406
7407         if (to_move >= length) {
7408                 /* we think we can steal the whole thing */
7409                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7410                         SCTP_TCB_SEND_LOCK(stcb);
7411                         send_lock_up = 1;
7412                 }
7413                 if (to_move < sp->length) {
7414                         /* bail, it changed */
7415                         goto dont_do_it;
7416                 }
7417                 chk->data = sp->data;
7418                 chk->last_mbuf = sp->tail_mbuf;
7419                 /* register the stealing */
7420                 sp->data = sp->tail_mbuf = NULL;
7421         } else {
7422                 struct mbuf *m;
7423
7424 dont_do_it:
7425                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7426                 chk->last_mbuf = NULL;
7427                 if (chk->data == NULL) {
7428                         sp->some_taken = some_taken;
7429                         sctp_free_a_chunk(stcb, chk, so_locked);
7430                         *bail = 1;
7431                         to_move = 0;
7432                         goto out_of;
7433                 }
7434 #ifdef SCTP_MBUF_LOGGING
7435                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7436                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7437                 }
7438 #endif
7439                 /* Pull off the data */
7440                 m_adj(sp->data, to_move);
7441                 /* Now lets work our way down and compact it */
7442                 m = sp->data;
7443                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7444                         sp->data = SCTP_BUF_NEXT(m);
7445                         SCTP_BUF_NEXT(m) = NULL;
7446                         if (sp->tail_mbuf == m) {
7447                                 /*-
7448                                  * Freeing tail? TSNH since
7449                                  * we supposedly were taking less
7450                                  * than the sp->length.
7451                                  */
7452 #ifdef INVARIANTS
7453                                 panic("Huh, freing tail? - TSNH");
7454 #else
7455                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7456                                 sp->tail_mbuf = sp->data = NULL;
7457                                 sp->length = 0;
7458 #endif
7459
7460                         }
7461                         sctp_m_free(m);
7462                         m = sp->data;
7463                 }
7464         }
7465         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7466                 chk->copy_by_ref = 1;
7467         } else {
7468                 chk->copy_by_ref = 0;
7469         }
7470         /*
7471          * get last_mbuf and counts of mb usage This is ugly but hopefully
7472          * its only one mbuf.
7473          */
7474         if (chk->last_mbuf == NULL) {
7475                 chk->last_mbuf = chk->data;
7476                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7477                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7478                 }
7479         }
7480         if (to_move > length) {
7481                 /*- This should not happen either
7482                  * since we always lower to_move to the size
7483                  * of sp->length if its larger.
7484                  */
7485 #ifdef INVARIANTS
7486                 panic("Huh, how can to_move be larger?");
7487 #else
7488                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7489                 sp->length = 0;
7490 #endif
7491         } else {
7492                 atomic_subtract_int(&sp->length, to_move);
7493         }
7494         if (stcb->asoc.idata_supported == 0) {
7495                 leading = sizeof(struct sctp_data_chunk);
7496         } else {
7497                 leading = sizeof(struct sctp_idata_chunk);
7498         }
7499         if (M_LEADINGSPACE(chk->data) < leading) {
7500                 /* Not enough room for a chunk header, get some */
7501                 struct mbuf *m;
7502
7503                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7504                 if (m == NULL) {
7505                         /*
7506                          * we're in trouble here. _PREPEND below will free
7507                          * all the data if there is no leading space, so we
7508                          * must put the data back and restore.
7509                          */
7510                         if (send_lock_up == 0) {
7511                                 SCTP_TCB_SEND_LOCK(stcb);
7512                                 send_lock_up = 1;
7513                         }
7514                         if (sp->data == NULL) {
7515                                 /* unsteal the data */
7516                                 sp->data = chk->data;
7517                                 sp->tail_mbuf = chk->last_mbuf;
7518                         } else {
7519                                 struct mbuf *m_tmp;
7520
7521                                 /* reassemble the data */
7522                                 m_tmp = sp->data;
7523                                 sp->data = chk->data;
7524                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7525                         }
7526                         sp->some_taken = some_taken;
7527                         atomic_add_int(&sp->length, to_move);
7528                         chk->data = NULL;
7529                         *bail = 1;
7530                         sctp_free_a_chunk(stcb, chk, so_locked);
7531                         to_move = 0;
7532                         goto out_of;
7533                 } else {
7534                         SCTP_BUF_LEN(m) = 0;
7535                         SCTP_BUF_NEXT(m) = chk->data;
7536                         chk->data = m;
7537                         M_ALIGN(chk->data, 4);
7538                 }
7539         }
7540         if (stcb->asoc.idata_supported == 0) {
7541                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7542         } else {
7543                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7544         }
7545         if (chk->data == NULL) {
7546                 /* HELP, TSNH since we assured it would not above? */
7547 #ifdef INVARIANTS
7548                 panic("prepend failes HELP?");
7549 #else
7550                 SCTP_PRINTF("prepend fails HELP?\n");
7551                 sctp_free_a_chunk(stcb, chk, so_locked);
7552 #endif
7553                 *bail = 1;
7554                 to_move = 0;
7555                 goto out_of;
7556         }
7557         if (stcb->asoc.idata_supported == 0) {
7558                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7559                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_data_chunk));
7560         } else {
7561                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7562                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_idata_chunk));
7563         }
7564         chk->book_size_scale = 0;
7565         chk->sent = SCTP_DATAGRAM_UNSENT;
7566
7567         chk->flags = 0;
7568         chk->asoc = &stcb->asoc;
7569         chk->pad_inplace = 0;
7570         chk->no_fr_allowed = 0;
7571         chk->rec.data.stream_seq = strq->next_sequence_send;
7572         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7573             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7574                 strq->next_sequence_send++;
7575         }
7576         chk->rec.data.stream_number = sp->stream;
7577         chk->rec.data.payloadtype = sp->ppid;
7578         chk->rec.data.context = sp->context;
7579         chk->rec.data.doing_fast_retransmit = 0;
7580
7581         chk->rec.data.timetodrop = sp->ts;
7582         chk->flags = sp->act_flags;
7583
7584         if (sp->net) {
7585                 chk->whoTo = sp->net;
7586                 atomic_add_int(&chk->whoTo->ref_count, 1);
7587         } else
7588                 chk->whoTo = NULL;
7589
7590         if (sp->holds_key_ref) {
7591                 chk->auth_keyid = sp->auth_keyid;
7592                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7593                 chk->holds_key_ref = 1;
7594         }
7595         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7596         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7597                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7598                     (uint32_t) (uintptr_t) stcb, sp->length,
7599                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7600                     chk->rec.data.TSN_seq);
7601         }
7602         if (stcb->asoc.idata_supported == 0) {
7603                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7604         } else {
7605                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7606         }
7607         /*
7608          * Put the rest of the things in place now. Size was done earlier in
7609          * previous loop prior to padding.
7610          */
7611
7612 #ifdef SCTP_ASOCLOG_OF_TSNS
7613         SCTP_TCB_LOCK_ASSERT(stcb);
7614         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7615                 asoc->tsn_out_at = 0;
7616                 asoc->tsn_out_wrapped = 1;
7617         }
7618         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7619         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7620         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7621         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7622         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7623         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7624         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7625         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7626         asoc->tsn_out_at++;
7627 #endif
7628         if (stcb->asoc.idata_supported == 0) {
7629                 dchkh->ch.chunk_type = SCTP_DATA;
7630                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7631                 dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7632                 dchkh->dp.stream_id = htons((strq->stream_no & 0x0000ffff));
7633                 dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7634                 dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7635                 dchkh->ch.chunk_length = htons(chk->send_size);
7636         } else {
7637                 ndchkh->ch.chunk_type = SCTP_IDATA;
7638                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7639                 ndchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7640                 ndchkh->dp.stream_id = htons(strq->stream_no);
7641                 /* WHAT DO WE DO HERE??? */
7642                 ndchkh->dp.reserved = htons(0);
7643                 ndchkh->dp.msg_id = htonl(sp->msg_id);
7644                 if (sp->fsn == 0)
7645                         ndchkh->dp.ppid_fsn.protocol_id = chk->rec.data.payloadtype;
7646                 else
7647                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7648                 sp->fsn++;
7649                 ndchkh->ch.chunk_length = htons(chk->send_size);
7650         }
7651         /* Now advance the chk->send_size by the actual pad needed. */
7652         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7653                 /* need a pad */
7654                 struct mbuf *lm;
7655                 int pads;
7656
7657                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7658                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7659                 if (lm != NULL) {
7660                         chk->last_mbuf = lm;
7661                         chk->pad_inplace = 1;
7662                 }
7663                 chk->send_size += pads;
7664         }
7665         if (PR_SCTP_ENABLED(chk->flags)) {
7666                 asoc->pr_sctp_cnt++;
7667         }
7668         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7669                 /* All done pull and kill the message */
7670                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7671                 if (sp->put_last_out == 0) {
7672                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7673                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7674                             sp->sender_all_done,
7675                             sp->length,
7676                             sp->msg_is_complete,
7677                             sp->put_last_out,
7678                             send_lock_up);
7679                 }
7680                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7681                         SCTP_TCB_SEND_LOCK(stcb);
7682                         send_lock_up = 1;
7683                 }
7684                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7685                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7686                     (strq->chunks_on_queues == 0) &&
7687                     TAILQ_EMPTY(&strq->outqueue)) {
7688                         stcb->asoc.trigger_reset = 1;
7689                 }
7690                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7691                 if (sp->net) {
7692                         sctp_free_remote_addr(sp->net);
7693                         sp->net = NULL;
7694                 }
7695                 if (sp->data) {
7696                         sctp_m_freem(sp->data);
7697                         sp->data = NULL;
7698                 }
7699                 sctp_free_a_strmoq(stcb, sp, so_locked);
7700
7701                 /* we can't be locked to it */
7702                 *locked = 0;
7703                 stcb->asoc.locked_on_sending = NULL;
7704         } else {
7705                 /* more to go, we are locked */
7706                 if (stcb->asoc.idata_supported == 0)
7707                         *locked = 1;
7708         }
7709         asoc->chunks_on_out_queue++;
7710         strq->chunks_on_queues++;
7711         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7712         asoc->send_queue_cnt++;
7713 out_of:
7714         if (send_lock_up) {
7715                 SCTP_TCB_SEND_UNLOCK(stcb);
7716         }
7717         return (to_move);
7718 }
7719
7720
7721 static void
7722 sctp_fill_outqueue(struct sctp_tcb *stcb,
7723     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7724 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7725     SCTP_UNUSED
7726 #endif
7727 )
7728 {
7729         struct sctp_association *asoc;
7730         struct sctp_stream_out *strq;
7731         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7732         int locked, giveup;
7733
7734         SCTP_TCB_LOCK_ASSERT(stcb);
7735         asoc = &stcb->asoc;
7736         switch (net->ro._l_addr.sa.sa_family) {
7737 #ifdef INET
7738         case AF_INET:
7739                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7740                 break;
7741 #endif
7742 #ifdef INET6
7743         case AF_INET6:
7744                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7745                 break;
7746 #endif
7747         default:
7748                 /* TSNH */
7749                 goal_mtu = net->mtu;
7750                 break;
7751         }
7752         /* Need an allowance for the data chunk header too */
7753         if (stcb->asoc.idata_supported == 0) {
7754                 goal_mtu -= sizeof(struct sctp_data_chunk);
7755         } else {
7756                 goal_mtu -= sizeof(struct sctp_idata_chunk);
7757         }
7758
7759         /* must make even word boundary */
7760         goal_mtu &= 0xfffffffc;
7761         if (asoc->locked_on_sending) {
7762                 /* We are stuck on one stream until the message completes. */
7763                 strq = asoc->locked_on_sending;
7764                 locked = 1;
7765         } else {
7766                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7767                 locked = 0;
7768         }
7769         while ((goal_mtu > 0) && strq) {
7770                 giveup = 0;
7771                 bail = 0;
7772                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7773                     &giveup, eeor_mode, &bail, so_locked);
7774                 if (moved_how_much)
7775                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7776
7777                 if (locked) {
7778                         asoc->locked_on_sending = strq;
7779                         if ((moved_how_much == 0) || (giveup) || bail)
7780                                 /* no more to move for now */
7781                                 break;
7782                 } else {
7783                         asoc->locked_on_sending = NULL;
7784                         if ((giveup) || bail) {
7785                                 break;
7786                         }
7787                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7788                         if (strq == NULL) {
7789                                 break;
7790                         }
7791                 }
7792                 total_moved += moved_how_much;
7793                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7794                 goal_mtu &= 0xfffffffc;
7795         }
7796         if (bail)
7797                 *quit_now = 1;
7798
7799         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7800
7801         if (total_moved == 0) {
7802                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7803                     (net == stcb->asoc.primary_destination)) {
7804                         /* ran dry for primary network net */
7805                         SCTP_STAT_INCR(sctps_primary_randry);
7806                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7807                         /* ran dry with CMT on */
7808                         SCTP_STAT_INCR(sctps_cmt_randry);
7809                 }
7810         }
7811 }
7812
7813 void
7814 sctp_fix_ecn_echo(struct sctp_association *asoc)
7815 {
7816         struct sctp_tmit_chunk *chk;
7817
7818         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7819                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7820                         chk->sent = SCTP_DATAGRAM_UNSENT;
7821                 }
7822         }
7823 }
7824
7825 void
7826 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7827 {
7828         struct sctp_association *asoc;
7829         struct sctp_tmit_chunk *chk;
7830         struct sctp_stream_queue_pending *sp;
7831         unsigned int i;
7832
7833         if (net == NULL) {
7834                 return;
7835         }
7836         asoc = &stcb->asoc;
7837         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7838                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7839                         if (sp->net == net) {
7840                                 sctp_free_remote_addr(sp->net);
7841                                 sp->net = NULL;
7842                         }
7843                 }
7844         }
7845         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7846                 if (chk->whoTo == net) {
7847                         sctp_free_remote_addr(chk->whoTo);
7848                         chk->whoTo = NULL;
7849                 }
7850         }
7851 }
7852
7853 int
7854 sctp_med_chunk_output(struct sctp_inpcb *inp,
7855     struct sctp_tcb *stcb,
7856     struct sctp_association *asoc,
7857     int *num_out,
7858     int *reason_code,
7859     int control_only, int from_where,
7860     struct timeval *now, int *now_filled, int frag_point, int so_locked
7861 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7862     SCTP_UNUSED
7863 #endif
7864 )
7865 {
7866         /**
7867          * Ok this is the generic chunk service queue. we must do the
7868          * following:
7869          * - Service the stream queue that is next, moving any
7870          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7871          *   LAST to the out queue in one pass) and assigning TSN's. This
7872          *   only applys though if the peer does not support NDATA. For NDATA
7873          *   chunks its ok to not send the entire message ;-)
7874          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7875          *   fomulate and send the low level chunks. Making sure to combine
7876          *   any control in the control chunk queue also.
7877          */
7878         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7879         struct mbuf *outchain, *endoutchain;
7880         struct sctp_tmit_chunk *chk, *nchk;
7881
7882         /* temp arrays for unlinking */
7883         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7884         int no_fragmentflg, error;
7885         unsigned int max_rwnd_per_dest, max_send_per_dest;
7886         int one_chunk, hbflag, skip_data_for_this_net;
7887         int asconf, cookie, no_out_cnt;
7888         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7889         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7890         int tsns_sent = 0;
7891         uint32_t auth_offset = 0;
7892         struct sctp_auth_chunk *auth = NULL;
7893         uint16_t auth_keyid;
7894         int override_ok = 1;
7895         int skip_fill_up = 0;
7896         int data_auth_reqd = 0;
7897
7898         /*
7899          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7900          * destination.
7901          */
7902         int quit_now = 0;
7903
7904         *num_out = 0;
7905         *reason_code = 0;
7906         auth_keyid = stcb->asoc.authinfo.active_keyid;
7907         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7908             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7909             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7910                 eeor_mode = 1;
7911         } else {
7912                 eeor_mode = 0;
7913         }
7914         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7915         /*
7916          * First lets prime the pump. For each destination, if there is room
7917          * in the flight size, attempt to pull an MTU's worth out of the
7918          * stream queues into the general send_queue
7919          */
7920 #ifdef SCTP_AUDITING_ENABLED
7921         sctp_audit_log(0xC2, 2);
7922 #endif
7923         SCTP_TCB_LOCK_ASSERT(stcb);
7924         hbflag = 0;
7925         if (control_only)
7926                 no_data_chunks = 1;
7927         else
7928                 no_data_chunks = 0;
7929
7930         /* Nothing to possible to send? */
7931         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7932             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7933             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7934             TAILQ_EMPTY(&asoc->send_queue) &&
7935             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7936 nothing_to_send:
7937                 *reason_code = 9;
7938                 return (0);
7939         }
7940         if (asoc->peers_rwnd == 0) {
7941                 /* No room in peers rwnd */
7942                 *reason_code = 1;
7943                 if (asoc->total_flight > 0) {
7944                         /* we are allowed one chunk in flight */
7945                         no_data_chunks = 1;
7946                 }
7947         }
7948         if (stcb->asoc.ecn_echo_cnt_onq) {
7949                 /* Record where a sack goes, if any */
7950                 if (no_data_chunks &&
7951                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7952                         /* Nothing but ECNe to send - we don't do that */
7953                         goto nothing_to_send;
7954                 }
7955                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7956                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7957                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7958                                 sack_goes_to = chk->whoTo;
7959                                 break;
7960                         }
7961                 }
7962         }
7963         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7964         if (stcb->sctp_socket)
7965                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7966         else
7967                 max_send_per_dest = 0;
7968         if (no_data_chunks == 0) {
7969                 /* How many non-directed chunks are there? */
7970                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7971                         if (chk->whoTo == NULL) {
7972                                 /*
7973                                  * We already have non-directed chunks on
7974                                  * the queue, no need to do a fill-up.
7975                                  */
7976                                 skip_fill_up = 1;
7977                                 break;
7978                         }
7979                 }
7980
7981         }
7982         if ((no_data_chunks == 0) &&
7983             (skip_fill_up == 0) &&
7984             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7985                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7986                         /*
7987                          * This for loop we are in takes in each net, if
7988                          * its's got space in cwnd and has data sent to it
7989                          * (when CMT is off) then it calls
7990                          * sctp_fill_outqueue for the net. This gets data on
7991                          * the send queue for that network.
7992                          *
7993                          * In sctp_fill_outqueue TSN's are assigned and data is
7994                          * copied out of the stream buffers. Note mostly
7995                          * copy by reference (we hope).
7996                          */
7997                         net->window_probe = 0;
7998                         if ((net != stcb->asoc.alternate) &&
7999                             ((net->dest_state & SCTP_ADDR_PF) ||
8000                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
8001                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
8002                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8003                                         sctp_log_cwnd(stcb, net, 1,
8004                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8005                                 }
8006                                 continue;
8007                         }
8008                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
8009                             (net->flight_size == 0)) {
8010                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
8011                         }
8012                         if (net->flight_size >= net->cwnd) {
8013                                 /* skip this network, no room - can't fill */
8014                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8015                                         sctp_log_cwnd(stcb, net, 3,
8016                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8017                                 }
8018                                 continue;
8019                         }
8020                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8021                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8022                         }
8023                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
8024                         if (quit_now) {
8025                                 /* memory alloc failure */
8026                                 no_data_chunks = 1;
8027                                 break;
8028                         }
8029                 }
8030         }
8031         /* now service each destination and send out what we can for it */
8032         /* Nothing to send? */
8033         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8034             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8035             TAILQ_EMPTY(&asoc->send_queue)) {
8036                 *reason_code = 8;
8037                 return (0);
8038         }
8039         if (asoc->sctp_cmt_on_off > 0) {
8040                 /* get the last start point */
8041                 start_at = asoc->last_net_cmt_send_started;
8042                 if (start_at == NULL) {
8043                         /* null so to beginning */
8044                         start_at = TAILQ_FIRST(&asoc->nets);
8045                 } else {
8046                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8047                         if (start_at == NULL) {
8048                                 start_at = TAILQ_FIRST(&asoc->nets);
8049                         }
8050                 }
8051                 asoc->last_net_cmt_send_started = start_at;
8052         } else {
8053                 start_at = TAILQ_FIRST(&asoc->nets);
8054         }
8055         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8056                 if (chk->whoTo == NULL) {
8057                         if (asoc->alternate) {
8058                                 chk->whoTo = asoc->alternate;
8059                         } else {
8060                                 chk->whoTo = asoc->primary_destination;
8061                         }
8062                         atomic_add_int(&chk->whoTo->ref_count, 1);
8063                 }
8064         }
8065         old_start_at = NULL;
8066 again_one_more_time:
8067         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8068                 /* how much can we send? */
8069                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8070                 if (old_start_at && (old_start_at == net)) {
8071                         /* through list ocmpletely. */
8072                         break;
8073                 }
8074                 tsns_sent = 0xa;
8075                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8076                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8077                     (net->flight_size >= net->cwnd)) {
8078                         /*
8079                          * Nothing on control or asconf and flight is full,
8080                          * we can skip even in the CMT case.
8081                          */
8082                         continue;
8083                 }
8084                 bundle_at = 0;
8085                 endoutchain = outchain = NULL;
8086                 no_fragmentflg = 1;
8087                 one_chunk = 0;
8088                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8089                         skip_data_for_this_net = 1;
8090                 } else {
8091                         skip_data_for_this_net = 0;
8092                 }
8093                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8094 #ifdef INET
8095                 case AF_INET:
8096                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8097                         break;
8098 #endif
8099 #ifdef INET6
8100                 case AF_INET6:
8101                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8102                         break;
8103 #endif
8104                 default:
8105                         /* TSNH */
8106                         mtu = net->mtu;
8107                         break;
8108                 }
8109                 mx_mtu = mtu;
8110                 to_out = 0;
8111                 if (mtu > asoc->peers_rwnd) {
8112                         if (asoc->total_flight > 0) {
8113                                 /* We have a packet in flight somewhere */
8114                                 r_mtu = asoc->peers_rwnd;
8115                         } else {
8116                                 /* We are always allowed to send one MTU out */
8117                                 one_chunk = 1;
8118                                 r_mtu = mtu;
8119                         }
8120                 } else {
8121                         r_mtu = mtu;
8122                 }
8123                 error = 0;
8124                 /************************/
8125                 /* ASCONF transmission */
8126                 /************************/
8127                 /* Now first lets go through the asconf queue */
8128                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8129                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8130                                 continue;
8131                         }
8132                         if (chk->whoTo == NULL) {
8133                                 if (asoc->alternate == NULL) {
8134                                         if (asoc->primary_destination != net) {
8135                                                 break;
8136                                         }
8137                                 } else {
8138                                         if (asoc->alternate != net) {
8139                                                 break;
8140                                         }
8141                                 }
8142                         } else {
8143                                 if (chk->whoTo != net) {
8144                                         break;
8145                                 }
8146                         }
8147                         if (chk->data == NULL) {
8148                                 break;
8149                         }
8150                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8151                             chk->sent != SCTP_DATAGRAM_RESEND) {
8152                                 break;
8153                         }
8154                         /*
8155                          * if no AUTH is yet included and this chunk
8156                          * requires it, make sure to account for it.  We
8157                          * don't apply the size until the AUTH chunk is
8158                          * actually added below in case there is no room for
8159                          * this chunk. NOTE: we overload the use of "omtu"
8160                          * here
8161                          */
8162                         if ((auth == NULL) &&
8163                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8164                             stcb->asoc.peer_auth_chunks)) {
8165                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8166                         } else
8167                                 omtu = 0;
8168                         /* Here we do NOT factor the r_mtu */
8169                         if ((chk->send_size < (int)(mtu - omtu)) ||
8170                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8171                                 /*
8172                                  * We probably should glom the mbuf chain
8173                                  * from the chk->data for control but the
8174                                  * problem is it becomes yet one more level
8175                                  * of tracking to do if for some reason
8176                                  * output fails. Then I have got to
8177                                  * reconstruct the merged control chain.. el
8178                                  * yucko.. for now we take the easy way and
8179                                  * do the copy
8180                                  */
8181                                 /*
8182                                  * Add an AUTH chunk, if chunk requires it
8183                                  * save the offset into the chain for AUTH
8184                                  */
8185                                 if ((auth == NULL) &&
8186                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8187                                     stcb->asoc.peer_auth_chunks))) {
8188                                         outchain = sctp_add_auth_chunk(outchain,
8189                                             &endoutchain,
8190                                             &auth,
8191                                             &auth_offset,
8192                                             stcb,
8193                                             chk->rec.chunk_id.id);
8194                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8195                                 }
8196                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8197                                     (int)chk->rec.chunk_id.can_take_data,
8198                                     chk->send_size, chk->copy_by_ref);
8199                                 if (outchain == NULL) {
8200                                         *reason_code = 8;
8201                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8202                                         return (ENOMEM);
8203                                 }
8204                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8205                                 /* update our MTU size */
8206                                 if (mtu > (chk->send_size + omtu))
8207                                         mtu -= (chk->send_size + omtu);
8208                                 else
8209                                         mtu = 0;
8210                                 to_out += (chk->send_size + omtu);
8211                                 /* Do clear IP_DF ? */
8212                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8213                                         no_fragmentflg = 0;
8214                                 }
8215                                 if (chk->rec.chunk_id.can_take_data)
8216                                         chk->data = NULL;
8217                                 /*
8218                                  * set hb flag since we can use these for
8219                                  * RTO
8220                                  */
8221                                 hbflag = 1;
8222                                 asconf = 1;
8223                                 /*
8224                                  * should sysctl this: don't bundle data
8225                                  * with ASCONF since it requires AUTH
8226                                  */
8227                                 no_data_chunks = 1;
8228                                 chk->sent = SCTP_DATAGRAM_SENT;
8229                                 if (chk->whoTo == NULL) {
8230                                         chk->whoTo = net;
8231                                         atomic_add_int(&net->ref_count, 1);
8232                                 }
8233                                 chk->snd_count++;
8234                                 if (mtu == 0) {
8235                                         /*
8236                                          * Ok we are out of room but we can
8237                                          * output without effecting the
8238                                          * flight size since this little guy
8239                                          * is a control only packet.
8240                                          */
8241                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8242                                         /*
8243                                          * do NOT clear the asconf flag as
8244                                          * it is used to do appropriate
8245                                          * source address selection.
8246                                          */
8247                                         if (*now_filled == 0) {
8248                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8249                                                 *now_filled = 1;
8250                                         }
8251                                         net->last_sent_time = *now;
8252                                         hbflag = 0;
8253                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8254                                             (struct sockaddr *)&net->ro._l_addr,
8255                                             outchain, auth_offset, auth,
8256                                             stcb->asoc.authinfo.active_keyid,
8257                                             no_fragmentflg, 0, asconf,
8258                                             inp->sctp_lport, stcb->rport,
8259                                             htonl(stcb->asoc.peer_vtag),
8260                                             net->port, NULL,
8261                                             0, 0,
8262                                             so_locked))) {
8263                                                 /*
8264                                                  * error, we could not
8265                                                  * output
8266                                                  */
8267                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8268                                                 if (from_where == 0) {
8269                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8270                                                 }
8271                                                 if (error == ENOBUFS) {
8272                                                         asoc->ifp_had_enobuf = 1;
8273                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8274                                                 }
8275                                                 /* error, could not output */
8276                                                 if (error == EHOSTUNREACH) {
8277                                                         /*
8278                                                          * Destination went
8279                                                          * unreachable
8280                                                          * during this send
8281                                                          */
8282                                                         sctp_move_chunks_from_net(stcb, net);
8283                                                 }
8284                                                 *reason_code = 7;
8285                                                 break;
8286                                         } else {
8287                                                 asoc->ifp_had_enobuf = 0;
8288                                         }
8289                                         /*
8290                                          * increase the number we sent, if a
8291                                          * cookie is sent we don't tell them
8292                                          * any was sent out.
8293                                          */
8294                                         outchain = endoutchain = NULL;
8295                                         auth = NULL;
8296                                         auth_offset = 0;
8297                                         if (!no_out_cnt)
8298                                                 *num_out += ctl_cnt;
8299                                         /* recalc a clean slate and setup */
8300                                         switch (net->ro._l_addr.sa.sa_family) {
8301 #ifdef INET
8302                                         case AF_INET:
8303                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8304                                                 break;
8305 #endif
8306 #ifdef INET6
8307                                         case AF_INET6:
8308                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8309                                                 break;
8310 #endif
8311                                         default:
8312                                                 /* TSNH */
8313                                                 mtu = net->mtu;
8314                                                 break;
8315                                         }
8316                                         to_out = 0;
8317                                         no_fragmentflg = 1;
8318                                 }
8319                         }
8320                 }
8321                 if (error != 0) {
8322                         /* try next net */
8323                         continue;
8324                 }
8325                 /************************/
8326                 /* Control transmission */
8327                 /************************/
8328                 /* Now first lets go through the control queue */
8329                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8330                         if ((sack_goes_to) &&
8331                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8332                             (chk->whoTo != sack_goes_to)) {
8333                                 /*
8334                                  * if we have a sack in queue, and we are
8335                                  * looking at an ecn echo that is NOT queued
8336                                  * to where the sack is going..
8337                                  */
8338                                 if (chk->whoTo == net) {
8339                                         /*
8340                                          * Don't transmit it to where its
8341                                          * going (current net)
8342                                          */
8343                                         continue;
8344                                 } else if (sack_goes_to == net) {
8345                                         /*
8346                                          * But do transmit it to this
8347                                          * address
8348                                          */
8349                                         goto skip_net_check;
8350                                 }
8351                         }
8352                         if (chk->whoTo == NULL) {
8353                                 if (asoc->alternate == NULL) {
8354                                         if (asoc->primary_destination != net) {
8355                                                 continue;
8356                                         }
8357                                 } else {
8358                                         if (asoc->alternate != net) {
8359                                                 continue;
8360                                         }
8361                                 }
8362                         } else {
8363                                 if (chk->whoTo != net) {
8364                                         continue;
8365                                 }
8366                         }
8367         skip_net_check:
8368                         if (chk->data == NULL) {
8369                                 continue;
8370                         }
8371                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8372                                 /*
8373                                  * It must be unsent. Cookies and ASCONF's
8374                                  * hang around but there timers will force
8375                                  * when marked for resend.
8376                                  */
8377                                 continue;
8378                         }
8379                         /*
8380                          * if no AUTH is yet included and this chunk
8381                          * requires it, make sure to account for it.  We
8382                          * don't apply the size until the AUTH chunk is
8383                          * actually added below in case there is no room for
8384                          * this chunk. NOTE: we overload the use of "omtu"
8385                          * here
8386                          */
8387                         if ((auth == NULL) &&
8388                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8389                             stcb->asoc.peer_auth_chunks)) {
8390                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8391                         } else
8392                                 omtu = 0;
8393                         /* Here we do NOT factor the r_mtu */
8394                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8395                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8396                                 /*
8397                                  * We probably should glom the mbuf chain
8398                                  * from the chk->data for control but the
8399                                  * problem is it becomes yet one more level
8400                                  * of tracking to do if for some reason
8401                                  * output fails. Then I have got to
8402                                  * reconstruct the merged control chain.. el
8403                                  * yucko.. for now we take the easy way and
8404                                  * do the copy
8405                                  */
8406                                 /*
8407                                  * Add an AUTH chunk, if chunk requires it
8408                                  * save the offset into the chain for AUTH
8409                                  */
8410                                 if ((auth == NULL) &&
8411                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8412                                     stcb->asoc.peer_auth_chunks))) {
8413                                         outchain = sctp_add_auth_chunk(outchain,
8414                                             &endoutchain,
8415                                             &auth,
8416                                             &auth_offset,
8417                                             stcb,
8418                                             chk->rec.chunk_id.id);
8419                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8420                                 }
8421                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8422                                     (int)chk->rec.chunk_id.can_take_data,
8423                                     chk->send_size, chk->copy_by_ref);
8424                                 if (outchain == NULL) {
8425                                         *reason_code = 8;
8426                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8427                                         return (ENOMEM);
8428                                 }
8429                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8430                                 /* update our MTU size */
8431                                 if (mtu > (chk->send_size + omtu))
8432                                         mtu -= (chk->send_size + omtu);
8433                                 else
8434                                         mtu = 0;
8435                                 to_out += (chk->send_size + omtu);
8436                                 /* Do clear IP_DF ? */
8437                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8438                                         no_fragmentflg = 0;
8439                                 }
8440                                 if (chk->rec.chunk_id.can_take_data)
8441                                         chk->data = NULL;
8442                                 /* Mark things to be removed, if needed */
8443                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8444                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8445                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8446                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8447                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8448                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8449                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8450                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8451                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8452                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8453                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8454                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8455                                                 hbflag = 1;
8456                                         }
8457                                         /* remove these chunks at the end */
8458                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8459                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8460                                                 /* turn off the timer */
8461                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8462                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8463                                                             inp, stcb, net,
8464                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8465                                                 }
8466                                         }
8467                                         ctl_cnt++;
8468                                 } else {
8469                                         /*
8470                                          * Other chunks, since they have
8471                                          * timers running (i.e. COOKIE) we
8472                                          * just "trust" that it gets sent or
8473                                          * retransmitted.
8474                                          */
8475                                         ctl_cnt++;
8476                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8477                                                 cookie = 1;
8478                                                 no_out_cnt = 1;
8479                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8480                                                 /*
8481                                                  * Increment ecne send count
8482                                                  * here this means we may be
8483                                                  * over-zealous in our
8484                                                  * counting if the send
8485                                                  * fails, but its the best
8486                                                  * place to do it (we used
8487                                                  * to do it in the queue of
8488                                                  * the chunk, but that did
8489                                                  * not tell how many times
8490                                                  * it was sent.
8491                                                  */
8492                                                 SCTP_STAT_INCR(sctps_sendecne);
8493                                         }
8494                                         chk->sent = SCTP_DATAGRAM_SENT;
8495                                         if (chk->whoTo == NULL) {
8496                                                 chk->whoTo = net;
8497                                                 atomic_add_int(&net->ref_count, 1);
8498                                         }
8499                                         chk->snd_count++;
8500                                 }
8501                                 if (mtu == 0) {
8502                                         /*
8503                                          * Ok we are out of room but we can
8504                                          * output without effecting the
8505                                          * flight size since this little guy
8506                                          * is a control only packet.
8507                                          */
8508                                         if (asconf) {
8509                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8510                                                 /*
8511                                                  * do NOT clear the asconf
8512                                                  * flag as it is used to do
8513                                                  * appropriate source
8514                                                  * address selection.
8515                                                  */
8516                                         }
8517                                         if (cookie) {
8518                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8519                                                 cookie = 0;
8520                                         }
8521                                         /* Only HB or ASCONF advances time */
8522                                         if (hbflag) {
8523                                                 if (*now_filled == 0) {
8524                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8525                                                         *now_filled = 1;
8526                                                 }
8527                                                 net->last_sent_time = *now;
8528                                                 hbflag = 0;
8529                                         }
8530                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8531                                             (struct sockaddr *)&net->ro._l_addr,
8532                                             outchain,
8533                                             auth_offset, auth,
8534                                             stcb->asoc.authinfo.active_keyid,
8535                                             no_fragmentflg, 0, asconf,
8536                                             inp->sctp_lport, stcb->rport,
8537                                             htonl(stcb->asoc.peer_vtag),
8538                                             net->port, NULL,
8539                                             0, 0,
8540                                             so_locked))) {
8541                                                 /*
8542                                                  * error, we could not
8543                                                  * output
8544                                                  */
8545                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8546                                                 if (from_where == 0) {
8547                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8548                                                 }
8549                                                 if (error == ENOBUFS) {
8550                                                         asoc->ifp_had_enobuf = 1;
8551                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8552                                                 }
8553                                                 if (error == EHOSTUNREACH) {
8554                                                         /*
8555                                                          * Destination went
8556                                                          * unreachable
8557                                                          * during this send
8558                                                          */
8559                                                         sctp_move_chunks_from_net(stcb, net);
8560                                                 }
8561                                                 *reason_code = 7;
8562                                                 break;
8563                                         } else {
8564                                                 asoc->ifp_had_enobuf = 0;
8565                                         }
8566                                         /*
8567                                          * increase the number we sent, if a
8568                                          * cookie is sent we don't tell them
8569                                          * any was sent out.
8570                                          */
8571                                         outchain = endoutchain = NULL;
8572                                         auth = NULL;
8573                                         auth_offset = 0;
8574                                         if (!no_out_cnt)
8575                                                 *num_out += ctl_cnt;
8576                                         /* recalc a clean slate and setup */
8577                                         switch (net->ro._l_addr.sa.sa_family) {
8578 #ifdef INET
8579                                         case AF_INET:
8580                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8581                                                 break;
8582 #endif
8583 #ifdef INET6
8584                                         case AF_INET6:
8585                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8586                                                 break;
8587 #endif
8588                                         default:
8589                                                 /* TSNH */
8590                                                 mtu = net->mtu;
8591                                                 break;
8592                                         }
8593                                         to_out = 0;
8594                                         no_fragmentflg = 1;
8595                                 }
8596                         }
8597                 }
8598                 if (error != 0) {
8599                         /* try next net */
8600                         continue;
8601                 }
8602                 /* JRI: if dest is in PF state, do not send data to it */
8603                 if ((asoc->sctp_cmt_on_off > 0) &&
8604                     (net != stcb->asoc.alternate) &&
8605                     (net->dest_state & SCTP_ADDR_PF)) {
8606                         goto no_data_fill;
8607                 }
8608                 if (net->flight_size >= net->cwnd) {
8609                         goto no_data_fill;
8610                 }
8611                 if ((asoc->sctp_cmt_on_off > 0) &&
8612                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8613                     (net->flight_size > max_rwnd_per_dest)) {
8614                         goto no_data_fill;
8615                 }
8616                 /*
8617                  * We need a specific accounting for the usage of the send
8618                  * buffer. We also need to check the number of messages per
8619                  * net. For now, this is better than nothing and it disabled
8620                  * by default...
8621                  */
8622                 if ((asoc->sctp_cmt_on_off > 0) &&
8623                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8624                     (max_send_per_dest > 0) &&
8625                     (net->flight_size > max_send_per_dest)) {
8626                         goto no_data_fill;
8627                 }
8628                 /*********************/
8629                 /* Data transmission */
8630                 /*********************/
8631                 /*
8632                  * if AUTH for DATA is required and no AUTH has been added
8633                  * yet, account for this in the mtu now... if no data can be
8634                  * bundled, this adjustment won't matter anyways since the
8635                  * packet will be going out...
8636                  */
8637                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8638                     stcb->asoc.peer_auth_chunks);
8639                 if (data_auth_reqd && (auth == NULL)) {
8640                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8641                 }
8642                 /* now lets add any data within the MTU constraints */
8643                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8644 #ifdef INET
8645                 case AF_INET:
8646                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8647                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8648                         else
8649                                 omtu = 0;
8650                         break;
8651 #endif
8652 #ifdef INET6
8653                 case AF_INET6:
8654                         if (net->mtu > SCTP_MIN_OVERHEAD)
8655                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8656                         else
8657                                 omtu = 0;
8658                         break;
8659 #endif
8660                 default:
8661                         /* TSNH */
8662                         omtu = 0;
8663                         break;
8664                 }
8665                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8666                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8667                     (skip_data_for_this_net == 0)) ||
8668                     (cookie)) {
8669                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8670                                 if (no_data_chunks) {
8671                                         /* let only control go out */
8672                                         *reason_code = 1;
8673                                         break;
8674                                 }
8675                                 if (net->flight_size >= net->cwnd) {
8676                                         /* skip this net, no room for data */
8677                                         *reason_code = 2;
8678                                         break;
8679                                 }
8680                                 if ((chk->whoTo != NULL) &&
8681                                     (chk->whoTo != net)) {
8682                                         /* Don't send the chunk on this net */
8683                                         continue;
8684                                 }
8685                                 if (asoc->sctp_cmt_on_off == 0) {
8686                                         if ((asoc->alternate) &&
8687                                             (asoc->alternate != net) &&
8688                                             (chk->whoTo == NULL)) {
8689                                                 continue;
8690                                         } else if ((net != asoc->primary_destination) &&
8691                                                     (asoc->alternate == NULL) &&
8692                                             (chk->whoTo == NULL)) {
8693                                                 continue;
8694                                         }
8695                                 }
8696                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8697                                         /*-
8698                                          * strange, we have a chunk that is
8699                                          * to big for its destination and
8700                                          * yet no fragment ok flag.
8701                                          * Something went wrong when the
8702                                          * PMTU changed...we did not mark
8703                                          * this chunk for some reason?? I
8704                                          * will fix it here by letting IP
8705                                          * fragment it for now and printing
8706                                          * a warning. This really should not
8707                                          * happen ...
8708                                          */
8709                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8710                                             chk->send_size, mtu);
8711                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8712                                 }
8713                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8714                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8715                                         struct sctp_data_chunk *dchkh;
8716
8717                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8718                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8719                                 }
8720                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8721                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8722                                         /* ok we will add this one */
8723
8724                                         /*
8725                                          * Add an AUTH chunk, if chunk
8726                                          * requires it, save the offset into
8727                                          * the chain for AUTH
8728                                          */
8729                                         if (data_auth_reqd) {
8730                                                 if (auth == NULL) {
8731                                                         outchain = sctp_add_auth_chunk(outchain,
8732                                                             &endoutchain,
8733                                                             &auth,
8734                                                             &auth_offset,
8735                                                             stcb,
8736                                                             SCTP_DATA);
8737                                                         auth_keyid = chk->auth_keyid;
8738                                                         override_ok = 0;
8739                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8740                                                 } else if (override_ok) {
8741                                                         /*
8742                                                          * use this data's
8743                                                          * keyid
8744                                                          */
8745                                                         auth_keyid = chk->auth_keyid;
8746                                                         override_ok = 0;
8747                                                 } else if (auth_keyid != chk->auth_keyid) {
8748                                                         /*
8749                                                          * different keyid,
8750                                                          * so done bundling
8751                                                          */
8752                                                         break;
8753                                                 }
8754                                         }
8755                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8756                                             chk->send_size, chk->copy_by_ref);
8757                                         if (outchain == NULL) {
8758                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8759                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8760                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8761                                                 }
8762                                                 *reason_code = 3;
8763                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8764                                                 return (ENOMEM);
8765                                         }
8766                                         /* upate our MTU size */
8767                                         /* Do clear IP_DF ? */
8768                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8769                                                 no_fragmentflg = 0;
8770                                         }
8771                                         /* unsigned subtraction of mtu */
8772                                         if (mtu > chk->send_size)
8773                                                 mtu -= chk->send_size;
8774                                         else
8775                                                 mtu = 0;
8776                                         /* unsigned subtraction of r_mtu */
8777                                         if (r_mtu > chk->send_size)
8778                                                 r_mtu -= chk->send_size;
8779                                         else
8780                                                 r_mtu = 0;
8781
8782                                         to_out += chk->send_size;
8783                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8784 #ifdef INVARIANTS
8785                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8786 #else
8787                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8788                                                     mx_mtu, to_out);
8789 #endif
8790                                         }
8791                                         chk->window_probe = 0;
8792                                         data_list[bundle_at++] = chk;
8793                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8794                                                 break;
8795                                         }
8796                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8797                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8798                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8799                                                 } else {
8800                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8801                                                 }
8802                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8803                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8804                                                         /*
8805                                                          * Count number of
8806                                                          * user msg's that
8807                                                          * were fragmented
8808                                                          * we do this by
8809                                                          * counting when we
8810                                                          * see a LAST
8811                                                          * fragment only.
8812                                                          */
8813                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8814                                         }
8815                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8816                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8817                                                         data_list[0]->window_probe = 1;
8818                                                         net->window_probe = 1;
8819                                                 }
8820                                                 break;
8821                                         }
8822                                 } else {
8823                                         /*
8824                                          * Must be sent in order of the
8825                                          * TSN's (on a network)
8826                                          */
8827                                         break;
8828                                 }
8829                         }       /* for (chunk gather loop for this net) */
8830                 }               /* if asoc.state OPEN */
8831 no_data_fill:
8832                 /* Is there something to send for this destination? */
8833                 if (outchain) {
8834                         /* We may need to start a control timer or two */
8835                         if (asconf) {
8836                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8837                                     stcb, net);
8838                                 /*
8839                                  * do NOT clear the asconf flag as it is
8840                                  * used to do appropriate source address
8841                                  * selection.
8842                                  */
8843                         }
8844                         if (cookie) {
8845                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8846                                 cookie = 0;
8847                         }
8848                         /* must start a send timer if data is being sent */
8849                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8850                                 /*
8851                                  * no timer running on this destination
8852                                  * restart it.
8853                                  */
8854                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8855                         }
8856                         if (bundle_at || hbflag) {
8857                                 /* For data/asconf and hb set time */
8858                                 if (*now_filled == 0) {
8859                                         (void)SCTP_GETTIME_TIMEVAL(now);
8860                                         *now_filled = 1;
8861                                 }
8862                                 net->last_sent_time = *now;
8863                         }
8864                         /* Now send it, if there is anything to send :> */
8865                         if ((error = sctp_lowlevel_chunk_output(inp,
8866                             stcb,
8867                             net,
8868                             (struct sockaddr *)&net->ro._l_addr,
8869                             outchain,
8870                             auth_offset,
8871                             auth,
8872                             auth_keyid,
8873                             no_fragmentflg,
8874                             bundle_at,
8875                             asconf,
8876                             inp->sctp_lport, stcb->rport,
8877                             htonl(stcb->asoc.peer_vtag),
8878                             net->port, NULL,
8879                             0, 0,
8880                             so_locked))) {
8881                                 /* error, we could not output */
8882                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8883                                 if (from_where == 0) {
8884                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8885                                 }
8886                                 if (error == ENOBUFS) {
8887                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8888                                         asoc->ifp_had_enobuf = 1;
8889                                 }
8890                                 if (error == EHOSTUNREACH) {
8891                                         /*
8892                                          * Destination went unreachable
8893                                          * during this send
8894                                          */
8895                                         sctp_move_chunks_from_net(stcb, net);
8896                                 }
8897                                 *reason_code = 6;
8898                                 /*-
8899                                  * I add this line to be paranoid. As far as
8900                                  * I can tell the continue, takes us back to
8901                                  * the top of the for, but just to make sure
8902                                  * I will reset these again here.
8903                                  */
8904                                 ctl_cnt = bundle_at = 0;
8905                                 continue;       /* This takes us back to the
8906                                                  * for() for the nets. */
8907                         } else {
8908                                 asoc->ifp_had_enobuf = 0;
8909                         }
8910                         endoutchain = NULL;
8911                         auth = NULL;
8912                         auth_offset = 0;
8913                         if (!no_out_cnt) {
8914                                 *num_out += (ctl_cnt + bundle_at);
8915                         }
8916                         if (bundle_at) {
8917                                 /* setup for a RTO measurement */
8918                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8919                                 /* fill time if not already filled */
8920                                 if (*now_filled == 0) {
8921                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8922                                         *now_filled = 1;
8923                                         *now = asoc->time_last_sent;
8924                                 } else {
8925                                         asoc->time_last_sent = *now;
8926                                 }
8927                                 if (net->rto_needed) {
8928                                         data_list[0]->do_rtt = 1;
8929                                         net->rto_needed = 0;
8930                                 }
8931                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8932                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8933                         }
8934                         if (one_chunk) {
8935                                 break;
8936                         }
8937                 }
8938                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8939                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8940                 }
8941         }
8942         if (old_start_at == NULL) {
8943                 old_start_at = start_at;
8944                 start_at = TAILQ_FIRST(&asoc->nets);
8945                 if (old_start_at)
8946                         goto again_one_more_time;
8947         }
8948         /*
8949          * At the end there should be no NON timed chunks hanging on this
8950          * queue.
8951          */
8952         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8953                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8954         }
8955         if ((*num_out == 0) && (*reason_code == 0)) {
8956                 *reason_code = 4;
8957         } else {
8958                 *reason_code = 5;
8959         }
8960         sctp_clean_up_ctl(stcb, asoc, so_locked);
8961         return (0);
8962 }
8963
8964 void
8965 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8966 {
8967         /*-
8968          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8969          * the control chunk queue.
8970          */
8971         struct sctp_chunkhdr *hdr;
8972         struct sctp_tmit_chunk *chk;
8973         struct mbuf *mat, *last_mbuf;
8974         uint32_t chunk_length;
8975         uint16_t padding_length;
8976
8977         SCTP_TCB_LOCK_ASSERT(stcb);
8978         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8979         if (op_err == NULL) {
8980                 return;
8981         }
8982         last_mbuf = NULL;
8983         chunk_length = 0;
8984         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8985                 chunk_length += SCTP_BUF_LEN(mat);
8986                 if (SCTP_BUF_NEXT(mat) == NULL) {
8987                         last_mbuf = mat;
8988                 }
8989         }
8990         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8991                 sctp_m_freem(op_err);
8992                 return;
8993         }
8994         padding_length = chunk_length % 4;
8995         if (padding_length != 0) {
8996                 padding_length = 4 - padding_length;
8997         }
8998         if (padding_length != 0) {
8999                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
9000                         sctp_m_freem(op_err);
9001                         return;
9002                 }
9003         }
9004         sctp_alloc_a_chunk(stcb, chk);
9005         if (chk == NULL) {
9006                 /* no memory */
9007                 sctp_m_freem(op_err);
9008                 return;
9009         }
9010         chk->copy_by_ref = 0;
9011         chk->send_size = (uint16_t) chunk_length;
9012         chk->sent = SCTP_DATAGRAM_UNSENT;
9013         chk->snd_count = 0;
9014         chk->asoc = &stcb->asoc;
9015         chk->data = op_err;
9016         chk->whoTo = NULL;
9017         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
9018         chk->rec.chunk_id.can_take_data = 0;
9019         hdr = mtod(op_err, struct sctp_chunkhdr *);
9020         hdr->chunk_type = SCTP_OPERATION_ERROR;
9021         hdr->chunk_flags = 0;
9022         hdr->chunk_length = htons(chk->send_size);
9023         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9024         chk->asoc->ctrl_queue_cnt++;
9025 }
9026
9027 int
9028 sctp_send_cookie_echo(struct mbuf *m,
9029     int offset,
9030     struct sctp_tcb *stcb,
9031     struct sctp_nets *net)
9032 {
9033         /*-
9034          * pull out the cookie and put it at the front of the control chunk
9035          * queue.
9036          */
9037         int at;
9038         struct mbuf *cookie;
9039         struct sctp_paramhdr parm, *phdr;
9040         struct sctp_chunkhdr *hdr;
9041         struct sctp_tmit_chunk *chk;
9042         uint16_t ptype, plen;
9043
9044         SCTP_TCB_LOCK_ASSERT(stcb);
9045         /* First find the cookie in the param area */
9046         cookie = NULL;
9047         at = offset + sizeof(struct sctp_init_chunk);
9048         for (;;) {
9049                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
9050                 if (phdr == NULL) {
9051                         return (-3);
9052                 }
9053                 ptype = ntohs(phdr->param_type);
9054                 plen = ntohs(phdr->param_length);
9055                 if (ptype == SCTP_STATE_COOKIE) {
9056                         int pad;
9057
9058                         /* found the cookie */
9059                         if ((pad = (plen % 4))) {
9060                                 plen += 4 - pad;
9061                         }
9062                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9063                         if (cookie == NULL) {
9064                                 /* No memory */
9065                                 return (-2);
9066                         }
9067 #ifdef SCTP_MBUF_LOGGING
9068                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9069                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9070                         }
9071 #endif
9072                         break;
9073                 }
9074                 at += SCTP_SIZE32(plen);
9075         }
9076         /* ok, we got the cookie lets change it into a cookie echo chunk */
9077         /* first the change from param to cookie */
9078         hdr = mtod(cookie, struct sctp_chunkhdr *);
9079         hdr->chunk_type = SCTP_COOKIE_ECHO;
9080         hdr->chunk_flags = 0;
9081         /* get the chunk stuff now and place it in the FRONT of the queue */
9082         sctp_alloc_a_chunk(stcb, chk);
9083         if (chk == NULL) {
9084                 /* no memory */
9085                 sctp_m_freem(cookie);
9086                 return (-5);
9087         }
9088         chk->copy_by_ref = 0;
9089         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9090         chk->rec.chunk_id.can_take_data = 0;
9091         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9092         chk->send_size = plen;
9093         chk->sent = SCTP_DATAGRAM_UNSENT;
9094         chk->snd_count = 0;
9095         chk->asoc = &stcb->asoc;
9096         chk->data = cookie;
9097         chk->whoTo = net;
9098         atomic_add_int(&chk->whoTo->ref_count, 1);
9099         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9100         chk->asoc->ctrl_queue_cnt++;
9101         return (0);
9102 }
9103
9104 void
9105 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9106     struct mbuf *m,
9107     int offset,
9108     int chk_length,
9109     struct sctp_nets *net)
9110 {
9111         /*
9112          * take a HB request and make it into a HB ack and send it.
9113          */
9114         struct mbuf *outchain;
9115         struct sctp_chunkhdr *chdr;
9116         struct sctp_tmit_chunk *chk;
9117
9118
9119         if (net == NULL)
9120                 /* must have a net pointer */
9121                 return;
9122
9123         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9124         if (outchain == NULL) {
9125                 /* gak out of memory */
9126                 return;
9127         }
9128 #ifdef SCTP_MBUF_LOGGING
9129         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9130                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9131         }
9132 #endif
9133         chdr = mtod(outchain, struct sctp_chunkhdr *);
9134         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9135         chdr->chunk_flags = 0;
9136         if (chk_length % 4) {
9137                 /* need pad */
9138                 uint32_t cpthis = 0;
9139                 int padlen;
9140
9141                 padlen = 4 - (chk_length % 4);
9142                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9143         }
9144         sctp_alloc_a_chunk(stcb, chk);
9145         if (chk == NULL) {
9146                 /* no memory */
9147                 sctp_m_freem(outchain);
9148                 return;
9149         }
9150         chk->copy_by_ref = 0;
9151         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9152         chk->rec.chunk_id.can_take_data = 1;
9153         chk->flags = 0;
9154         chk->send_size = chk_length;
9155         chk->sent = SCTP_DATAGRAM_UNSENT;
9156         chk->snd_count = 0;
9157         chk->asoc = &stcb->asoc;
9158         chk->data = outchain;
9159         chk->whoTo = net;
9160         atomic_add_int(&chk->whoTo->ref_count, 1);
9161         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9162         chk->asoc->ctrl_queue_cnt++;
9163 }
9164
9165 void
9166 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9167 {
9168         /* formulate and queue a cookie-ack back to sender */
9169         struct mbuf *cookie_ack;
9170         struct sctp_chunkhdr *hdr;
9171         struct sctp_tmit_chunk *chk;
9172
9173         SCTP_TCB_LOCK_ASSERT(stcb);
9174
9175         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9176         if (cookie_ack == NULL) {
9177                 /* no mbuf's */
9178                 return;
9179         }
9180         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9181         sctp_alloc_a_chunk(stcb, chk);
9182         if (chk == NULL) {
9183                 /* no memory */
9184                 sctp_m_freem(cookie_ack);
9185                 return;
9186         }
9187         chk->copy_by_ref = 0;
9188         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9189         chk->rec.chunk_id.can_take_data = 1;
9190         chk->flags = 0;
9191         chk->send_size = sizeof(struct sctp_chunkhdr);
9192         chk->sent = SCTP_DATAGRAM_UNSENT;
9193         chk->snd_count = 0;
9194         chk->asoc = &stcb->asoc;
9195         chk->data = cookie_ack;
9196         if (chk->asoc->last_control_chunk_from != NULL) {
9197                 chk->whoTo = chk->asoc->last_control_chunk_from;
9198                 atomic_add_int(&chk->whoTo->ref_count, 1);
9199         } else {
9200                 chk->whoTo = NULL;
9201         }
9202         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9203         hdr->chunk_type = SCTP_COOKIE_ACK;
9204         hdr->chunk_flags = 0;
9205         hdr->chunk_length = htons(chk->send_size);
9206         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9207         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9208         chk->asoc->ctrl_queue_cnt++;
9209         return;
9210 }
9211
9212
9213 void
9214 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9215 {
9216         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9217         struct mbuf *m_shutdown_ack;
9218         struct sctp_shutdown_ack_chunk *ack_cp;
9219         struct sctp_tmit_chunk *chk;
9220
9221         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9222         if (m_shutdown_ack == NULL) {
9223                 /* no mbuf's */
9224                 return;
9225         }
9226         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9227         sctp_alloc_a_chunk(stcb, chk);
9228         if (chk == NULL) {
9229                 /* no memory */
9230                 sctp_m_freem(m_shutdown_ack);
9231                 return;
9232         }
9233         chk->copy_by_ref = 0;
9234         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9235         chk->rec.chunk_id.can_take_data = 1;
9236         chk->flags = 0;
9237         chk->send_size = sizeof(struct sctp_chunkhdr);
9238         chk->sent = SCTP_DATAGRAM_UNSENT;
9239         chk->snd_count = 0;
9240         chk->flags = 0;
9241         chk->asoc = &stcb->asoc;
9242         chk->data = m_shutdown_ack;
9243         chk->whoTo = net;
9244         if (chk->whoTo) {
9245                 atomic_add_int(&chk->whoTo->ref_count, 1);
9246         }
9247         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9248         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9249         ack_cp->ch.chunk_flags = 0;
9250         ack_cp->ch.chunk_length = htons(chk->send_size);
9251         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9252         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9253         chk->asoc->ctrl_queue_cnt++;
9254         return;
9255 }
9256
9257 void
9258 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9259 {
9260         /* formulate and queue a SHUTDOWN to the sender */
9261         struct mbuf *m_shutdown;
9262         struct sctp_shutdown_chunk *shutdown_cp;
9263         struct sctp_tmit_chunk *chk;
9264
9265         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9266         if (m_shutdown == NULL) {
9267                 /* no mbuf's */
9268                 return;
9269         }
9270         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9271         sctp_alloc_a_chunk(stcb, chk);
9272         if (chk == NULL) {
9273                 /* no memory */
9274                 sctp_m_freem(m_shutdown);
9275                 return;
9276         }
9277         chk->copy_by_ref = 0;
9278         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9279         chk->rec.chunk_id.can_take_data = 1;
9280         chk->flags = 0;
9281         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9282         chk->sent = SCTP_DATAGRAM_UNSENT;
9283         chk->snd_count = 0;
9284         chk->flags = 0;
9285         chk->asoc = &stcb->asoc;
9286         chk->data = m_shutdown;
9287         chk->whoTo = net;
9288         if (chk->whoTo) {
9289                 atomic_add_int(&chk->whoTo->ref_count, 1);
9290         }
9291         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9292         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9293         shutdown_cp->ch.chunk_flags = 0;
9294         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9295         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9296         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9297         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9298         chk->asoc->ctrl_queue_cnt++;
9299         return;
9300 }
9301
9302 void
9303 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9304 {
9305         /*
9306          * formulate and queue an ASCONF to the peer. ASCONF parameters
9307          * should be queued on the assoc queue.
9308          */
9309         struct sctp_tmit_chunk *chk;
9310         struct mbuf *m_asconf;
9311         int len;
9312
9313         SCTP_TCB_LOCK_ASSERT(stcb);
9314
9315         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9316             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9317                 /* can't send a new one if there is one in flight already */
9318                 return;
9319         }
9320         /* compose an ASCONF chunk, maximum length is PMTU */
9321         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9322         if (m_asconf == NULL) {
9323                 return;
9324         }
9325         sctp_alloc_a_chunk(stcb, chk);
9326         if (chk == NULL) {
9327                 /* no memory */
9328                 sctp_m_freem(m_asconf);
9329                 return;
9330         }
9331         chk->copy_by_ref = 0;
9332         chk->rec.chunk_id.id = SCTP_ASCONF;
9333         chk->rec.chunk_id.can_take_data = 0;
9334         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9335         chk->data = m_asconf;
9336         chk->send_size = len;
9337         chk->sent = SCTP_DATAGRAM_UNSENT;
9338         chk->snd_count = 0;
9339         chk->asoc = &stcb->asoc;
9340         chk->whoTo = net;
9341         if (chk->whoTo) {
9342                 atomic_add_int(&chk->whoTo->ref_count, 1);
9343         }
9344         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9345         chk->asoc->ctrl_queue_cnt++;
9346         return;
9347 }
9348
9349 void
9350 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9351 {
9352         /*
9353          * formulate and queue a asconf-ack back to sender. the asconf-ack
9354          * must be stored in the tcb.
9355          */
9356         struct sctp_tmit_chunk *chk;
9357         struct sctp_asconf_ack *ack, *latest_ack;
9358         struct mbuf *m_ack;
9359         struct sctp_nets *net = NULL;
9360
9361         SCTP_TCB_LOCK_ASSERT(stcb);
9362         /* Get the latest ASCONF-ACK */
9363         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9364         if (latest_ack == NULL) {
9365                 return;
9366         }
9367         if (latest_ack->last_sent_to != NULL &&
9368             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9369                 /* we're doing a retransmission */
9370                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9371                 if (net == NULL) {
9372                         /* no alternate */
9373                         if (stcb->asoc.last_control_chunk_from == NULL) {
9374                                 if (stcb->asoc.alternate) {
9375                                         net = stcb->asoc.alternate;
9376                                 } else {
9377                                         net = stcb->asoc.primary_destination;
9378                                 }
9379                         } else {
9380                                 net = stcb->asoc.last_control_chunk_from;
9381                         }
9382                 }
9383         } else {
9384                 /* normal case */
9385                 if (stcb->asoc.last_control_chunk_from == NULL) {
9386                         if (stcb->asoc.alternate) {
9387                                 net = stcb->asoc.alternate;
9388                         } else {
9389                                 net = stcb->asoc.primary_destination;
9390                         }
9391                 } else {
9392                         net = stcb->asoc.last_control_chunk_from;
9393                 }
9394         }
9395         latest_ack->last_sent_to = net;
9396
9397         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9398                 if (ack->data == NULL) {
9399                         continue;
9400                 }
9401                 /* copy the asconf_ack */
9402                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9403                 if (m_ack == NULL) {
9404                         /* couldn't copy it */
9405                         return;
9406                 }
9407 #ifdef SCTP_MBUF_LOGGING
9408                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9409                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9410                 }
9411 #endif
9412
9413                 sctp_alloc_a_chunk(stcb, chk);
9414                 if (chk == NULL) {
9415                         /* no memory */
9416                         if (m_ack)
9417                                 sctp_m_freem(m_ack);
9418                         return;
9419                 }
9420                 chk->copy_by_ref = 0;
9421                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9422                 chk->rec.chunk_id.can_take_data = 1;
9423                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9424                 chk->whoTo = net;
9425                 if (chk->whoTo) {
9426                         atomic_add_int(&chk->whoTo->ref_count, 1);
9427                 }
9428                 chk->data = m_ack;
9429                 chk->send_size = ack->len;
9430                 chk->sent = SCTP_DATAGRAM_UNSENT;
9431                 chk->snd_count = 0;
9432                 chk->asoc = &stcb->asoc;
9433
9434                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9435                 chk->asoc->ctrl_queue_cnt++;
9436         }
9437         return;
9438 }
9439
9440
9441 static int
9442 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9443     struct sctp_tcb *stcb,
9444     struct sctp_association *asoc,
9445     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9446 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9447     SCTP_UNUSED
9448 #endif
9449 )
9450 {
9451         /*-
9452          * send out one MTU of retransmission. If fast_retransmit is
9453          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9454          * rwnd. For a Cookie or Asconf in the control chunk queue we
9455          * retransmit them by themselves.
9456          *
9457          * For data chunks we will pick out the lowest TSN's in the sent_queue
9458          * marked for resend and bundle them all together (up to a MTU of
9459          * destination). The address to send to should have been
9460          * selected/changed where the retransmission was marked (i.e. in FR
9461          * or t3-timeout routines).
9462          */
9463         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9464         struct sctp_tmit_chunk *chk, *fwd;
9465         struct mbuf *m, *endofchain;
9466         struct sctp_nets *net = NULL;
9467         uint32_t tsns_sent = 0;
9468         int no_fragmentflg, bundle_at, cnt_thru;
9469         unsigned int mtu;
9470         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9471         struct sctp_auth_chunk *auth = NULL;
9472         uint32_t auth_offset = 0;
9473         uint16_t auth_keyid;
9474         int override_ok = 1;
9475         int data_auth_reqd = 0;
9476         uint32_t dmtu = 0;
9477
9478         SCTP_TCB_LOCK_ASSERT(stcb);
9479         tmr_started = ctl_cnt = bundle_at = error = 0;
9480         no_fragmentflg = 1;
9481         fwd_tsn = 0;
9482         *cnt_out = 0;
9483         fwd = NULL;
9484         endofchain = m = NULL;
9485         auth_keyid = stcb->asoc.authinfo.active_keyid;
9486 #ifdef SCTP_AUDITING_ENABLED
9487         sctp_audit_log(0xC3, 1);
9488 #endif
9489         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9490             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9491                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9492                     asoc->sent_queue_retran_cnt);
9493                 asoc->sent_queue_cnt = 0;
9494                 asoc->sent_queue_cnt_removeable = 0;
9495                 /* send back 0/0 so we enter normal transmission */
9496                 *cnt_out = 0;
9497                 return (0);
9498         }
9499         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9500                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9501                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9502                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9503                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9504                                 continue;
9505                         }
9506                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9507                                 if (chk != asoc->str_reset) {
9508                                         /*
9509                                          * not eligible for retran if its
9510                                          * not ours
9511                                          */
9512                                         continue;
9513                                 }
9514                         }
9515                         ctl_cnt++;
9516                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9517                                 fwd_tsn = 1;
9518                         }
9519                         /*
9520                          * Add an AUTH chunk, if chunk requires it save the
9521                          * offset into the chain for AUTH
9522                          */
9523                         if ((auth == NULL) &&
9524                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9525                             stcb->asoc.peer_auth_chunks))) {
9526                                 m = sctp_add_auth_chunk(m, &endofchain,
9527                                     &auth, &auth_offset,
9528                                     stcb,
9529                                     chk->rec.chunk_id.id);
9530                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9531                         }
9532                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9533                         break;
9534                 }
9535         }
9536         one_chunk = 0;
9537         cnt_thru = 0;
9538         /* do we have control chunks to retransmit? */
9539         if (m != NULL) {
9540                 /* Start a timer no matter if we succeed or fail */
9541                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9542                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9543                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9544                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9545                 chk->snd_count++;       /* update our count */
9546                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9547                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9548                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9549                     no_fragmentflg, 0, 0,
9550                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9551                     chk->whoTo->port, NULL,
9552                     0, 0,
9553                     so_locked))) {
9554                         SCTP_STAT_INCR(sctps_lowlevelerr);
9555                         return (error);
9556                 }
9557                 endofchain = NULL;
9558                 auth = NULL;
9559                 auth_offset = 0;
9560                 /*
9561                  * We don't want to mark the net->sent time here since this
9562                  * we use this for HB and retrans cannot measure RTT
9563                  */
9564                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9565                 *cnt_out += 1;
9566                 chk->sent = SCTP_DATAGRAM_SENT;
9567                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9568                 if (fwd_tsn == 0) {
9569                         return (0);
9570                 } else {
9571                         /* Clean up the fwd-tsn list */
9572                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9573                         return (0);
9574                 }
9575         }
9576         /*
9577          * Ok, it is just data retransmission we need to do or that and a
9578          * fwd-tsn with it all.
9579          */
9580         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9581                 return (SCTP_RETRAN_DONE);
9582         }
9583         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9584             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9585                 /* not yet open, resend the cookie and that is it */
9586                 return (1);
9587         }
9588 #ifdef SCTP_AUDITING_ENABLED
9589         sctp_auditing(20, inp, stcb, NULL);
9590 #endif
9591         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9592         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9593                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9594                         /* No, not sent to this net or not ready for rtx */
9595                         continue;
9596                 }
9597                 if (chk->data == NULL) {
9598                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9599                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9600                         continue;
9601                 }
9602                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9603                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9604                         struct mbuf *op_err;
9605                         char msg[SCTP_DIAG_INFO_LEN];
9606
9607                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9608                             chk->rec.data.TSN_seq, chk->snd_count);
9609                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9610                             msg);
9611                         atomic_add_int(&stcb->asoc.refcnt, 1);
9612                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9613                             so_locked);
9614                         SCTP_TCB_LOCK(stcb);
9615                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9616                         return (SCTP_RETRAN_EXIT);
9617                 }
9618                 /* pick up the net */
9619                 net = chk->whoTo;
9620                 switch (net->ro._l_addr.sa.sa_family) {
9621 #ifdef INET
9622                 case AF_INET:
9623                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9624                         break;
9625 #endif
9626 #ifdef INET6
9627                 case AF_INET6:
9628                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9629                         break;
9630 #endif
9631                 default:
9632                         /* TSNH */
9633                         mtu = net->mtu;
9634                         break;
9635                 }
9636
9637                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9638                         /* No room in peers rwnd */
9639                         uint32_t tsn;
9640
9641                         tsn = asoc->last_acked_seq + 1;
9642                         if (tsn == chk->rec.data.TSN_seq) {
9643                                 /*
9644                                  * we make a special exception for this
9645                                  * case. The peer has no rwnd but is missing
9646                                  * the lowest chunk.. which is probably what
9647                                  * is holding up the rwnd.
9648                                  */
9649                                 goto one_chunk_around;
9650                         }
9651                         return (1);
9652                 }
9653 one_chunk_around:
9654                 if (asoc->peers_rwnd < mtu) {
9655                         one_chunk = 1;
9656                         if ((asoc->peers_rwnd == 0) &&
9657                             (asoc->total_flight == 0)) {
9658                                 chk->window_probe = 1;
9659                                 chk->whoTo->window_probe = 1;
9660                         }
9661                 }
9662 #ifdef SCTP_AUDITING_ENABLED
9663                 sctp_audit_log(0xC3, 2);
9664 #endif
9665                 bundle_at = 0;
9666                 m = NULL;
9667                 net->fast_retran_ip = 0;
9668                 if (chk->rec.data.doing_fast_retransmit == 0) {
9669                         /*
9670                          * if no FR in progress skip destination that have
9671                          * flight_size > cwnd.
9672                          */
9673                         if (net->flight_size >= net->cwnd) {
9674                                 continue;
9675                         }
9676                 } else {
9677                         /*
9678                          * Mark the destination net to have FR recovery
9679                          * limits put on it.
9680                          */
9681                         *fr_done = 1;
9682                         net->fast_retran_ip = 1;
9683                 }
9684
9685                 /*
9686                  * if no AUTH is yet included and this chunk requires it,
9687                  * make sure to account for it.  We don't apply the size
9688                  * until the AUTH chunk is actually added below in case
9689                  * there is no room for this chunk.
9690                  */
9691                 if (data_auth_reqd && (auth == NULL)) {
9692                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9693                 } else
9694                         dmtu = 0;
9695
9696                 if ((chk->send_size <= (mtu - dmtu)) ||
9697                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9698                         /* ok we will add this one */
9699                         if (data_auth_reqd) {
9700                                 if (auth == NULL) {
9701                                         m = sctp_add_auth_chunk(m,
9702                                             &endofchain,
9703                                             &auth,
9704                                             &auth_offset,
9705                                             stcb,
9706                                             SCTP_DATA);
9707                                         auth_keyid = chk->auth_keyid;
9708                                         override_ok = 0;
9709                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9710                                 } else if (override_ok) {
9711                                         auth_keyid = chk->auth_keyid;
9712                                         override_ok = 0;
9713                                 } else if (chk->auth_keyid != auth_keyid) {
9714                                         /* different keyid, so done bundling */
9715                                         break;
9716                                 }
9717                         }
9718                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9719                         if (m == NULL) {
9720                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9721                                 return (ENOMEM);
9722                         }
9723                         /* Do clear IP_DF ? */
9724                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9725                                 no_fragmentflg = 0;
9726                         }
9727                         /* upate our MTU size */
9728                         if (mtu > (chk->send_size + dmtu))
9729                                 mtu -= (chk->send_size + dmtu);
9730                         else
9731                                 mtu = 0;
9732                         data_list[bundle_at++] = chk;
9733                         if (one_chunk && (asoc->total_flight <= 0)) {
9734                                 SCTP_STAT_INCR(sctps_windowprobed);
9735                         }
9736                 }
9737                 if (one_chunk == 0) {
9738                         /*
9739                          * now are there anymore forward from chk to pick
9740                          * up?
9741                          */
9742                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9743                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9744                                         /* Nope, not for retran */
9745                                         continue;
9746                                 }
9747                                 if (fwd->whoTo != net) {
9748                                         /* Nope, not the net in question */
9749                                         continue;
9750                                 }
9751                                 if (data_auth_reqd && (auth == NULL)) {
9752                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9753                                 } else
9754                                         dmtu = 0;
9755                                 if (fwd->send_size <= (mtu - dmtu)) {
9756                                         if (data_auth_reqd) {
9757                                                 if (auth == NULL) {
9758                                                         m = sctp_add_auth_chunk(m,
9759                                                             &endofchain,
9760                                                             &auth,
9761                                                             &auth_offset,
9762                                                             stcb,
9763                                                             SCTP_DATA);
9764                                                         auth_keyid = fwd->auth_keyid;
9765                                                         override_ok = 0;
9766                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9767                                                 } else if (override_ok) {
9768                                                         auth_keyid = fwd->auth_keyid;
9769                                                         override_ok = 0;
9770                                                 } else if (fwd->auth_keyid != auth_keyid) {
9771                                                         /*
9772                                                          * different keyid,
9773                                                          * so done bundling
9774                                                          */
9775                                                         break;
9776                                                 }
9777                                         }
9778                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9779                                         if (m == NULL) {
9780                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9781                                                 return (ENOMEM);
9782                                         }
9783                                         /* Do clear IP_DF ? */
9784                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9785                                                 no_fragmentflg = 0;
9786                                         }
9787                                         /* upate our MTU size */
9788                                         if (mtu > (fwd->send_size + dmtu))
9789                                                 mtu -= (fwd->send_size + dmtu);
9790                                         else
9791                                                 mtu = 0;
9792                                         data_list[bundle_at++] = fwd;
9793                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9794                                                 break;
9795                                         }
9796                                 } else {
9797                                         /* can't fit so we are done */
9798                                         break;
9799                                 }
9800                         }
9801                 }
9802                 /* Is there something to send for this destination? */
9803                 if (m) {
9804                         /*
9805                          * No matter if we fail/or succeed we should start a
9806                          * timer. A failure is like a lost IP packet :-)
9807                          */
9808                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9809                                 /*
9810                                  * no timer running on this destination
9811                                  * restart it.
9812                                  */
9813                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9814                                 tmr_started = 1;
9815                         }
9816                         /* Now lets send it, if there is anything to send :> */
9817                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9818                             (struct sockaddr *)&net->ro._l_addr, m,
9819                             auth_offset, auth, auth_keyid,
9820                             no_fragmentflg, 0, 0,
9821                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9822                             net->port, NULL,
9823                             0, 0,
9824                             so_locked))) {
9825                                 /* error, we could not output */
9826                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9827                                 return (error);
9828                         }
9829                         endofchain = NULL;
9830                         auth = NULL;
9831                         auth_offset = 0;
9832                         /* For HB's */
9833                         /*
9834                          * We don't want to mark the net->sent time here
9835                          * since this we use this for HB and retrans cannot
9836                          * measure RTT
9837                          */
9838                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9839
9840                         /* For auto-close */
9841                         cnt_thru++;
9842                         if (*now_filled == 0) {
9843                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9844                                 *now = asoc->time_last_sent;
9845                                 *now_filled = 1;
9846                         } else {
9847                                 asoc->time_last_sent = *now;
9848                         }
9849                         *cnt_out += bundle_at;
9850 #ifdef SCTP_AUDITING_ENABLED
9851                         sctp_audit_log(0xC4, bundle_at);
9852 #endif
9853                         if (bundle_at) {
9854                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9855                         }
9856                         for (i = 0; i < bundle_at; i++) {
9857                                 SCTP_STAT_INCR(sctps_sendretransdata);
9858                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9859                                 /*
9860                                  * When we have a revoked data, and we
9861                                  * retransmit it, then we clear the revoked
9862                                  * flag since this flag dictates if we
9863                                  * subtracted from the fs
9864                                  */
9865                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9866                                         /* Deflate the cwnd */
9867                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9868                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9869                                 }
9870                                 data_list[i]->snd_count++;
9871                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9872                                 /* record the time */
9873                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9874                                 if (data_list[i]->book_size_scale) {
9875                                         /*
9876                                          * need to double the book size on
9877                                          * this one
9878                                          */
9879                                         data_list[i]->book_size_scale = 0;
9880                                         /*
9881                                          * Since we double the booksize, we
9882                                          * must also double the output queue
9883                                          * size, since this get shrunk when
9884                                          * we free by this amount.
9885                                          */
9886                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9887                                         data_list[i]->book_size *= 2;
9888
9889
9890                                 } else {
9891                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9892                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9893                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9894                                         }
9895                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9896                                             (uint32_t) (data_list[i]->send_size +
9897                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9898                                 }
9899                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9900                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9901                                             data_list[i]->whoTo->flight_size,
9902                                             data_list[i]->book_size,
9903                                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
9904                                             data_list[i]->rec.data.TSN_seq);
9905                                 }
9906                                 sctp_flight_size_increase(data_list[i]);
9907                                 sctp_total_flight_increase(stcb, data_list[i]);
9908                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9909                                         /* SWS sender side engages */
9910                                         asoc->peers_rwnd = 0;
9911                                 }
9912                                 if ((i == 0) &&
9913                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9914                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9915                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9916                                             (tmr_started == 0)) {
9917                                                 /*-
9918                                                  * ok we just fast-retrans'd
9919                                                  * the lowest TSN, i.e the
9920                                                  * first on the list. In
9921                                                  * this case we want to give
9922                                                  * some more time to get a
9923                                                  * SACK back without a
9924                                                  * t3-expiring.
9925                                                  */
9926                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9927                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9928                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9929                                         }
9930                                 }
9931                         }
9932                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9933                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9934                         }
9935 #ifdef SCTP_AUDITING_ENABLED
9936                         sctp_auditing(21, inp, stcb, NULL);
9937 #endif
9938                 } else {
9939                         /* None will fit */
9940                         return (1);
9941                 }
9942                 if (asoc->sent_queue_retran_cnt <= 0) {
9943                         /* all done we have no more to retran */
9944                         asoc->sent_queue_retran_cnt = 0;
9945                         break;
9946                 }
9947                 if (one_chunk) {
9948                         /* No more room in rwnd */
9949                         return (1);
9950                 }
9951                 /* stop the for loop here. we sent out a packet */
9952                 break;
9953         }
9954         return (0);
9955 }
9956
9957 static void
9958 sctp_timer_validation(struct sctp_inpcb *inp,
9959     struct sctp_tcb *stcb,
9960     struct sctp_association *asoc)
9961 {
9962         struct sctp_nets *net;
9963
9964         /* Validate that a timer is running somewhere */
9965         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9966                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9967                         /* Here is a timer */
9968                         return;
9969                 }
9970         }
9971         SCTP_TCB_LOCK_ASSERT(stcb);
9972         /* Gak, we did not have a timer somewhere */
9973         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9974         if (asoc->alternate) {
9975                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9976         } else {
9977                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9978         }
9979         return;
9980 }
9981
9982 void
9983 sctp_chunk_output(struct sctp_inpcb *inp,
9984     struct sctp_tcb *stcb,
9985     int from_where,
9986     int so_locked
9987 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9988     SCTP_UNUSED
9989 #endif
9990 )
9991 {
9992         /*-
9993          * Ok this is the generic chunk service queue. we must do the
9994          * following:
9995          * - See if there are retransmits pending, if so we must
9996          *   do these first.
9997          * - Service the stream queue that is next, moving any
9998          *   message (note I must get a complete message i.e.
9999          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10000          *   TSN's
10001          * - Check to see if the cwnd/rwnd allows any output, if so we
10002          *   go ahead and fomulate and send the low level chunks. Making sure
10003          *   to combine any control in the control chunk queue also.
10004          */
10005         struct sctp_association *asoc;
10006         struct sctp_nets *net;
10007         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10008         unsigned int burst_cnt = 0;
10009         struct timeval now;
10010         int now_filled = 0;
10011         int nagle_on;
10012         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10013         int un_sent = 0;
10014         int fr_done;
10015         unsigned int tot_frs = 0;
10016
10017         asoc = &stcb->asoc;
10018 do_it_again:
10019         /* The Nagle algorithm is only applied when handling a send call. */
10020         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10021                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10022                         nagle_on = 0;
10023                 } else {
10024                         nagle_on = 1;
10025                 }
10026         } else {
10027                 nagle_on = 0;
10028         }
10029         SCTP_TCB_LOCK_ASSERT(stcb);
10030
10031         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10032
10033         if ((un_sent <= 0) &&
10034             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10035             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10036             (asoc->sent_queue_retran_cnt == 0) &&
10037             (asoc->trigger_reset == 0)) {
10038                 /* Nothing to do unless there is something to be sent left */
10039                 return;
10040         }
10041         /*
10042          * Do we have something to send, data or control AND a sack timer
10043          * running, if so piggy-back the sack.
10044          */
10045         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10046                 sctp_send_sack(stcb, so_locked);
10047                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10048         }
10049         while (asoc->sent_queue_retran_cnt) {
10050                 /*-
10051                  * Ok, it is retransmission time only, we send out only ONE
10052                  * packet with a single call off to the retran code.
10053                  */
10054                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10055                         /*-
10056                          * Special hook for handling cookiess discarded
10057                          * by peer that carried data. Send cookie-ack only
10058                          * and then the next call with get the retran's.
10059                          */
10060                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10061                             from_where,
10062                             &now, &now_filled, frag_point, so_locked);
10063                         return;
10064                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10065                         /* if its not from a HB then do it */
10066                         fr_done = 0;
10067                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10068                         if (fr_done) {
10069                                 tot_frs++;
10070                         }
10071                 } else {
10072                         /*
10073                          * its from any other place, we don't allow retran
10074                          * output (only control)
10075                          */
10076                         ret = 1;
10077                 }
10078                 if (ret > 0) {
10079                         /* Can't send anymore */
10080                         /*-
10081                          * now lets push out control by calling med-level
10082                          * output once. this assures that we WILL send HB's
10083                          * if queued too.
10084                          */
10085                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10086                             from_where,
10087                             &now, &now_filled, frag_point, so_locked);
10088 #ifdef SCTP_AUDITING_ENABLED
10089                         sctp_auditing(8, inp, stcb, NULL);
10090 #endif
10091                         sctp_timer_validation(inp, stcb, asoc);
10092                         return;
10093                 }
10094                 if (ret < 0) {
10095                         /*-
10096                          * The count was off.. retran is not happening so do
10097                          * the normal retransmission.
10098                          */
10099 #ifdef SCTP_AUDITING_ENABLED
10100                         sctp_auditing(9, inp, stcb, NULL);
10101 #endif
10102                         if (ret == SCTP_RETRAN_EXIT) {
10103                                 return;
10104                         }
10105                         break;
10106                 }
10107                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10108                         /* Only one transmission allowed out of a timeout */
10109 #ifdef SCTP_AUDITING_ENABLED
10110                         sctp_auditing(10, inp, stcb, NULL);
10111 #endif
10112                         /* Push out any control */
10113                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10114                             &now, &now_filled, frag_point, so_locked);
10115                         return;
10116                 }
10117                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10118                         /* Hit FR burst limit */
10119                         return;
10120                 }
10121                 if ((num_out == 0) && (ret == 0)) {
10122                         /* No more retrans to send */
10123                         break;
10124                 }
10125         }
10126 #ifdef SCTP_AUDITING_ENABLED
10127         sctp_auditing(12, inp, stcb, NULL);
10128 #endif
10129         /* Check for bad destinations, if they exist move chunks around. */
10130         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10131                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10132                         /*-
10133                          * if possible move things off of this address we
10134                          * still may send below due to the dormant state but
10135                          * we try to find an alternate address to send to
10136                          * and if we have one we move all queued data on the
10137                          * out wheel to this alternate address.
10138                          */
10139                         if (net->ref_count > 1)
10140                                 sctp_move_chunks_from_net(stcb, net);
10141                 } else {
10142                         /*-
10143                          * if ((asoc->sat_network) || (net->addr_is_local))
10144                          * { burst_limit = asoc->max_burst *
10145                          * SCTP_SAT_NETWORK_BURST_INCR; }
10146                          */
10147                         if (asoc->max_burst > 0) {
10148                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10149                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10150                                                 /*
10151                                                  * JRS - Use the congestion
10152                                                  * control given in the
10153                                                  * congestion control module
10154                                                  */
10155                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10156                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10157                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10158                                                 }
10159                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10160                                         }
10161                                         net->fast_retran_ip = 0;
10162                                 } else {
10163                                         if (net->flight_size == 0) {
10164                                                 /*
10165                                                  * Should be decaying the
10166                                                  * cwnd here
10167                                                  */
10168                                                 ;
10169                                         }
10170                                 }
10171                         }
10172                 }
10173
10174         }
10175         burst_cnt = 0;
10176         do {
10177                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10178                     &reason_code, 0, from_where,
10179                     &now, &now_filled, frag_point, so_locked);
10180                 if (error) {
10181                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10182                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10183                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10184                         }
10185                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10186                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10187                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10188                         }
10189                         break;
10190                 }
10191                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10192
10193                 tot_out += num_out;
10194                 burst_cnt++;
10195                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10196                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10197                         if (num_out == 0) {
10198                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10199                         }
10200                 }
10201                 if (nagle_on) {
10202                         /*
10203                          * When the Nagle algorithm is used, look at how
10204                          * much is unsent, then if its smaller than an MTU
10205                          * and we have data in flight we stop, except if we
10206                          * are handling a fragmented user message.
10207                          */
10208                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10209                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10210                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10211                             (stcb->asoc.total_flight > 0) &&
10212                             ((stcb->asoc.locked_on_sending == NULL) ||
10213                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10214                                 break;
10215                         }
10216                 }
10217                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10218                     TAILQ_EMPTY(&asoc->send_queue) &&
10219                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10220                         /* Nothing left to send */
10221                         break;
10222                 }
10223                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10224                         /* Nothing left to send */
10225                         break;
10226                 }
10227         } while (num_out &&
10228             ((asoc->max_burst == 0) ||
10229             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10230             (burst_cnt < asoc->max_burst)));
10231
10232         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10233                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10234                         SCTP_STAT_INCR(sctps_maxburstqueued);
10235                         asoc->burst_limit_applied = 1;
10236                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10237                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10238                         }
10239                 } else {
10240                         asoc->burst_limit_applied = 0;
10241                 }
10242         }
10243         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10244                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10245         }
10246         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10247             tot_out);
10248
10249         /*-
10250          * Now we need to clean up the control chunk chain if a ECNE is on
10251          * it. It must be marked as UNSENT again so next call will continue
10252          * to send it until such time that we get a CWR, to remove it.
10253          */
10254         if (stcb->asoc.ecn_echo_cnt_onq)
10255                 sctp_fix_ecn_echo(asoc);
10256
10257         if (stcb->asoc.trigger_reset) {
10258                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10259                         goto do_it_again;
10260                 }
10261         }
10262         return;
10263 }
10264
10265
10266 int
10267 sctp_output(
10268     struct sctp_inpcb *inp,
10269     struct mbuf *m,
10270     struct sockaddr *addr,
10271     struct mbuf *control,
10272     struct thread *p,
10273     int flags)
10274 {
10275         if (inp == NULL) {
10276                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10277                 return (EINVAL);
10278         }
10279         if (inp->sctp_socket == NULL) {
10280                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10281                 return (EINVAL);
10282         }
10283         return (sctp_sosend(inp->sctp_socket,
10284             addr,
10285             (struct uio *)NULL,
10286             m,
10287             control,
10288             flags, p
10289             ));
10290 }
10291
10292 void
10293 send_forward_tsn(struct sctp_tcb *stcb,
10294     struct sctp_association *asoc)
10295 {
10296         struct sctp_tmit_chunk *chk;
10297         struct sctp_forward_tsn_chunk *fwdtsn;
10298         uint32_t advance_peer_ack_point;
10299         int old;
10300
10301         if (asoc->idata_supported) {
10302                 old = 0;
10303         } else {
10304                 old = 1;
10305         }
10306         SCTP_TCB_LOCK_ASSERT(stcb);
10307         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10308                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10309                         /* mark it to unsent */
10310                         chk->sent = SCTP_DATAGRAM_UNSENT;
10311                         chk->snd_count = 0;
10312                         /* Do we correct its output location? */
10313                         if (chk->whoTo) {
10314                                 sctp_free_remote_addr(chk->whoTo);
10315                                 chk->whoTo = NULL;
10316                         }
10317                         goto sctp_fill_in_rest;
10318                 }
10319         }
10320         /* Ok if we reach here we must build one */
10321         sctp_alloc_a_chunk(stcb, chk);
10322         if (chk == NULL) {
10323                 return;
10324         }
10325         asoc->fwd_tsn_cnt++;
10326         chk->copy_by_ref = 0;
10327         /*
10328          * We don't do the old thing here since this is used not for on-wire
10329          * but to tell if we are sending a fwd-tsn by the stack during
10330          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10331          */
10332         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10333         chk->rec.chunk_id.can_take_data = 0;
10334         chk->flags = 0;
10335         chk->asoc = asoc;
10336         chk->whoTo = NULL;
10337         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10338         if (chk->data == NULL) {
10339                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10340                 return;
10341         }
10342         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10343         chk->sent = SCTP_DATAGRAM_UNSENT;
10344         chk->snd_count = 0;
10345         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10346         asoc->ctrl_queue_cnt++;
10347 sctp_fill_in_rest:
10348         /*-
10349          * Here we go through and fill out the part that deals with
10350          * stream/seq of the ones we skip.
10351          */
10352         SCTP_BUF_LEN(chk->data) = 0;
10353         {
10354                 struct sctp_tmit_chunk *at, *tp1, *last;
10355                 struct sctp_strseq *strseq;
10356                 struct sctp_strseq_mid *strseq_m;
10357                 unsigned int cnt_of_space, i, ovh;
10358                 unsigned int space_needed;
10359                 unsigned int cnt_of_skipped = 0;
10360
10361                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10362                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10363                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10364                                 /* no more to look at */
10365                                 break;
10366                         }
10367                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10368                                 /* We don't report these */
10369                                 continue;
10370                         }
10371                         cnt_of_skipped++;
10372                 }
10373                 if (old) {
10374                         space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10375                             (cnt_of_skipped * sizeof(struct sctp_strseq)));
10376                 } else {
10377                         space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10378                             (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10379                 }
10380                 cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10381
10382                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10383                         ovh = SCTP_MIN_OVERHEAD;
10384                 } else {
10385                         ovh = SCTP_MIN_V4_OVERHEAD;
10386                 }
10387                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10388                         /* trim to a mtu size */
10389                         cnt_of_space = asoc->smallest_mtu - ovh;
10390                 }
10391                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10392                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10393                             0xff, 0, cnt_of_skipped,
10394                             asoc->advanced_peer_ack_point);
10395
10396                 }
10397                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10398                 if (cnt_of_space < space_needed) {
10399                         /*-
10400                          * ok we must trim down the chunk by lowering the
10401                          * advance peer ack point.
10402                          */
10403                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10404                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10405                                     0xff, 0xff, cnt_of_space,
10406                                     space_needed);
10407                         }
10408                         if (old) {
10409                                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10410                                 cnt_of_skipped /= sizeof(struct sctp_strseq);
10411                         } else {
10412                                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10413                                 cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10414                         }
10415                         /*-
10416                          * Go through and find the TSN that will be the one
10417                          * we report.
10418                          */
10419                         at = TAILQ_FIRST(&asoc->sent_queue);
10420                         if (at != NULL) {
10421                                 for (i = 0; i < cnt_of_skipped; i++) {
10422                                         tp1 = TAILQ_NEXT(at, sctp_next);
10423                                         if (tp1 == NULL) {
10424                                                 break;
10425                                         }
10426                                         at = tp1;
10427                                 }
10428                         }
10429                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10430                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10431                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10432                                     asoc->advanced_peer_ack_point);
10433                         }
10434                         last = at;
10435                         /*-
10436                          * last now points to last one I can report, update
10437                          * peer ack point
10438                          */
10439                         if (last)
10440                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10441                         if (old) {
10442                                 space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10443                                     cnt_of_skipped * sizeof(struct sctp_strseq);
10444                         } else {
10445                                 space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10446                                     cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10447                         }
10448                 }
10449                 chk->send_size = space_needed;
10450                 /* Setup the chunk */
10451                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10452                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10453                 fwdtsn->ch.chunk_flags = 0;
10454                 if (old) {
10455                         fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10456                 } else {
10457                         fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10458                 }
10459                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10460                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10461                 fwdtsn++;
10462                 /*-
10463                  * Move pointer to after the fwdtsn and transfer to the
10464                  * strseq pointer.
10465                  */
10466                 if (old) {
10467                         strseq = (struct sctp_strseq *)fwdtsn;
10468                 } else {
10469                         strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10470                 }
10471                 /*-
10472                  * Now populate the strseq list. This is done blindly
10473                  * without pulling out duplicate stream info. This is
10474                  * inefficent but won't harm the process since the peer will
10475                  * look at these in sequence and will thus release anything.
10476                  * It could mean we exceed the PMTU and chop off some that
10477                  * we could have included.. but this is unlikely (aka 1432/4
10478                  * would mean 300+ stream seq's would have to be reported in
10479                  * one FWD-TSN. With a bit of work we can later FIX this to
10480                  * optimize and pull out duplcates.. but it does add more
10481                  * overhead. So for now... not!
10482                  */
10483                 at = TAILQ_FIRST(&asoc->sent_queue);
10484                 for (i = 0; i < cnt_of_skipped; i++) {
10485                         tp1 = TAILQ_NEXT(at, sctp_next);
10486                         if (tp1 == NULL)
10487                                 break;
10488                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10489                                 /* We don't report these */
10490                                 i--;
10491                                 at = tp1;
10492                                 continue;
10493                         }
10494                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10495                                 at->rec.data.fwd_tsn_cnt = 0;
10496                         }
10497                         if (old) {
10498                                 strseq->stream = ntohs(at->rec.data.stream_number);
10499                                 strseq->sequence = ntohs(at->rec.data.stream_seq);
10500                                 strseq++;
10501                         } else {
10502                                 strseq_m->stream = ntohs(at->rec.data.stream_number);
10503                                 strseq_m->reserved = ntohs(0);
10504                                 strseq_m->msg_id = ntohl(at->rec.data.stream_seq);
10505                                 strseq_m++;
10506                         }
10507                         at = tp1;
10508                 }
10509         }
10510         return;
10511 }
10512
10513 void
10514 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10515 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10516     SCTP_UNUSED
10517 #endif
10518 )
10519 {
10520         /*-
10521          * Queue up a SACK or NR-SACK in the control queue.
10522          * We must first check to see if a SACK or NR-SACK is
10523          * somehow on the control queue.
10524          * If so, we will take and and remove the old one.
10525          */
10526         struct sctp_association *asoc;
10527         struct sctp_tmit_chunk *chk, *a_chk;
10528         struct sctp_sack_chunk *sack;
10529         struct sctp_nr_sack_chunk *nr_sack;
10530         struct sctp_gap_ack_block *gap_descriptor;
10531         const struct sack_track *selector;
10532         int mergeable = 0;
10533         int offset;
10534         caddr_t limit;
10535         uint32_t *dup;
10536         int limit_reached = 0;
10537         unsigned int i, siz, j;
10538         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10539         int num_dups = 0;
10540         int space_req;
10541         uint32_t highest_tsn;
10542         uint8_t flags;
10543         uint8_t type;
10544         uint8_t tsn_map;
10545
10546         if (stcb->asoc.nrsack_supported == 1) {
10547                 type = SCTP_NR_SELECTIVE_ACK;
10548         } else {
10549                 type = SCTP_SELECTIVE_ACK;
10550         }
10551         a_chk = NULL;
10552         asoc = &stcb->asoc;
10553         SCTP_TCB_LOCK_ASSERT(stcb);
10554         if (asoc->last_data_chunk_from == NULL) {
10555                 /* Hmm we never received anything */
10556                 return;
10557         }
10558         sctp_slide_mapping_arrays(stcb);
10559         sctp_set_rwnd(stcb, asoc);
10560         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10561                 if (chk->rec.chunk_id.id == type) {
10562                         /* Hmm, found a sack already on queue, remove it */
10563                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10564                         asoc->ctrl_queue_cnt--;
10565                         a_chk = chk;
10566                         if (a_chk->data) {
10567                                 sctp_m_freem(a_chk->data);
10568                                 a_chk->data = NULL;
10569                         }
10570                         if (a_chk->whoTo) {
10571                                 sctp_free_remote_addr(a_chk->whoTo);
10572                                 a_chk->whoTo = NULL;
10573                         }
10574                         break;
10575                 }
10576         }
10577         if (a_chk == NULL) {
10578                 sctp_alloc_a_chunk(stcb, a_chk);
10579                 if (a_chk == NULL) {
10580                         /* No memory so we drop the idea, and set a timer */
10581                         if (stcb->asoc.delayed_ack) {
10582                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10583                                     stcb->sctp_ep, stcb, NULL,
10584                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10585                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10586                                     stcb->sctp_ep, stcb, NULL);
10587                         } else {
10588                                 stcb->asoc.send_sack = 1;
10589                         }
10590                         return;
10591                 }
10592                 a_chk->copy_by_ref = 0;
10593                 a_chk->rec.chunk_id.id = type;
10594                 a_chk->rec.chunk_id.can_take_data = 1;
10595         }
10596         /* Clear our pkt counts */
10597         asoc->data_pkts_seen = 0;
10598
10599         a_chk->flags = 0;
10600         a_chk->asoc = asoc;
10601         a_chk->snd_count = 0;
10602         a_chk->send_size = 0;   /* fill in later */
10603         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10604         a_chk->whoTo = NULL;
10605
10606         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10607                 /*-
10608                  * Ok, the destination for the SACK is unreachable, lets see if
10609                  * we can select an alternate to asoc->last_data_chunk_from
10610                  */
10611                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10612                 if (a_chk->whoTo == NULL) {
10613                         /* Nope, no alternate */
10614                         a_chk->whoTo = asoc->last_data_chunk_from;
10615                 }
10616         } else {
10617                 a_chk->whoTo = asoc->last_data_chunk_from;
10618         }
10619         if (a_chk->whoTo) {
10620                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10621         }
10622         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10623                 highest_tsn = asoc->highest_tsn_inside_map;
10624         } else {
10625                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10626         }
10627         if (highest_tsn == asoc->cumulative_tsn) {
10628                 /* no gaps */
10629                 if (type == SCTP_SELECTIVE_ACK) {
10630                         space_req = sizeof(struct sctp_sack_chunk);
10631                 } else {
10632                         space_req = sizeof(struct sctp_nr_sack_chunk);
10633                 }
10634         } else {
10635                 /* gaps get a cluster */
10636                 space_req = MCLBYTES;
10637         }
10638         /* Ok now lets formulate a MBUF with our sack */
10639         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10640         if ((a_chk->data == NULL) ||
10641             (a_chk->whoTo == NULL)) {
10642                 /* rats, no mbuf memory */
10643                 if (a_chk->data) {
10644                         /* was a problem with the destination */
10645                         sctp_m_freem(a_chk->data);
10646                         a_chk->data = NULL;
10647                 }
10648                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10649                 /* sa_ignore NO_NULL_CHK */
10650                 if (stcb->asoc.delayed_ack) {
10651                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10652                             stcb->sctp_ep, stcb, NULL,
10653                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10654                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10655                             stcb->sctp_ep, stcb, NULL);
10656                 } else {
10657                         stcb->asoc.send_sack = 1;
10658                 }
10659                 return;
10660         }
10661         /* ok, lets go through and fill it in */
10662         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10663         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10664         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10665                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10666         }
10667         limit = mtod(a_chk->data, caddr_t);
10668         limit += space;
10669
10670         flags = 0;
10671
10672         if ((asoc->sctp_cmt_on_off > 0) &&
10673             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10674                 /*-
10675                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10676                  * received, then set high bit to 1, else 0. Reset
10677                  * pkts_rcvd.
10678                  */
10679                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10680                 asoc->cmt_dac_pkts_rcvd = 0;
10681         }
10682 #ifdef SCTP_ASOCLOG_OF_TSNS
10683         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10684         stcb->asoc.cumack_log_atsnt++;
10685         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10686                 stcb->asoc.cumack_log_atsnt = 0;
10687         }
10688 #endif
10689         /* reset the readers interpretation */
10690         stcb->freed_by_sorcv_sincelast = 0;
10691
10692         if (type == SCTP_SELECTIVE_ACK) {
10693                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10694                 nr_sack = NULL;
10695                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10696                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10697                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10698                 } else {
10699                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10700                 }
10701         } else {
10702                 sack = NULL;
10703                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10704                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10705                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10706                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10707                 } else {
10708                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10709                 }
10710         }
10711
10712         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10713                 offset = 1;
10714         } else {
10715                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10716         }
10717         if (((type == SCTP_SELECTIVE_ACK) &&
10718             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10719             ((type == SCTP_NR_SELECTIVE_ACK) &&
10720             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10721                 /* we have a gap .. maybe */
10722                 for (i = 0; i < siz; i++) {
10723                         tsn_map = asoc->mapping_array[i];
10724                         if (type == SCTP_SELECTIVE_ACK) {
10725                                 tsn_map |= asoc->nr_mapping_array[i];
10726                         }
10727                         if (i == 0) {
10728                                 /*
10729                                  * Clear all bits corresponding to TSNs
10730                                  * smaller or equal to the cumulative TSN.
10731                                  */
10732                                 tsn_map &= (~0U << (1 - offset));
10733                         }
10734                         selector = &sack_array[tsn_map];
10735                         if (mergeable && selector->right_edge) {
10736                                 /*
10737                                  * Backup, left and right edges were ok to
10738                                  * merge.
10739                                  */
10740                                 num_gap_blocks--;
10741                                 gap_descriptor--;
10742                         }
10743                         if (selector->num_entries == 0)
10744                                 mergeable = 0;
10745                         else {
10746                                 for (j = 0; j < selector->num_entries; j++) {
10747                                         if (mergeable && selector->right_edge) {
10748                                                 /*
10749                                                  * do a merge by NOT setting
10750                                                  * the left side
10751                                                  */
10752                                                 mergeable = 0;
10753                                         } else {
10754                                                 /*
10755                                                  * no merge, set the left
10756                                                  * side
10757                                                  */
10758                                                 mergeable = 0;
10759                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10760                                         }
10761                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10762                                         num_gap_blocks++;
10763                                         gap_descriptor++;
10764                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10765                                                 /* no more room */
10766                                                 limit_reached = 1;
10767                                                 break;
10768                                         }
10769                                 }
10770                                 if (selector->left_edge) {
10771                                         mergeable = 1;
10772                                 }
10773                         }
10774                         if (limit_reached) {
10775                                 /* Reached the limit stop */
10776                                 break;
10777                         }
10778                         offset += 8;
10779                 }
10780         }
10781         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10782             (limit_reached == 0)) {
10783
10784                 mergeable = 0;
10785
10786                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10787                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10788                 } else {
10789                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10790                 }
10791
10792                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10793                         offset = 1;
10794                 } else {
10795                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10796                 }
10797                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10798                         /* we have a gap .. maybe */
10799                         for (i = 0; i < siz; i++) {
10800                                 tsn_map = asoc->nr_mapping_array[i];
10801                                 if (i == 0) {
10802                                         /*
10803                                          * Clear all bits corresponding to
10804                                          * TSNs smaller or equal to the
10805                                          * cumulative TSN.
10806                                          */
10807                                         tsn_map &= (~0U << (1 - offset));
10808                                 }
10809                                 selector = &sack_array[tsn_map];
10810                                 if (mergeable && selector->right_edge) {
10811                                         /*
10812                                          * Backup, left and right edges were
10813                                          * ok to merge.
10814                                          */
10815                                         num_nr_gap_blocks--;
10816                                         gap_descriptor--;
10817                                 }
10818                                 if (selector->num_entries == 0)
10819                                         mergeable = 0;
10820                                 else {
10821                                         for (j = 0; j < selector->num_entries; j++) {
10822                                                 if (mergeable && selector->right_edge) {
10823                                                         /*
10824                                                          * do a merge by NOT
10825                                                          * setting the left
10826                                                          * side
10827                                                          */
10828                                                         mergeable = 0;
10829                                                 } else {
10830                                                         /*
10831                                                          * no merge, set the
10832                                                          * left side
10833                                                          */
10834                                                         mergeable = 0;
10835                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10836                                                 }
10837                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10838                                                 num_nr_gap_blocks++;
10839                                                 gap_descriptor++;
10840                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10841                                                         /* no more room */
10842                                                         limit_reached = 1;
10843                                                         break;
10844                                                 }
10845                                         }
10846                                         if (selector->left_edge) {
10847                                                 mergeable = 1;
10848                                         }
10849                                 }
10850                                 if (limit_reached) {
10851                                         /* Reached the limit stop */
10852                                         break;
10853                                 }
10854                                 offset += 8;
10855                         }
10856                 }
10857         }
10858         /* now we must add any dups we are going to report. */
10859         if ((limit_reached == 0) && (asoc->numduptsns)) {
10860                 dup = (uint32_t *) gap_descriptor;
10861                 for (i = 0; i < asoc->numduptsns; i++) {
10862                         *dup = htonl(asoc->dup_tsns[i]);
10863                         dup++;
10864                         num_dups++;
10865                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10866                                 /* no more room */
10867                                 break;
10868                         }
10869                 }
10870                 asoc->numduptsns = 0;
10871         }
10872         /*
10873          * now that the chunk is prepared queue it to the control chunk
10874          * queue.
10875          */
10876         if (type == SCTP_SELECTIVE_ACK) {
10877                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_sack_chunk) +
10878                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10879                     num_dups * sizeof(int32_t));
10880                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10881                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10882                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10883                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10884                 sack->sack.num_dup_tsns = htons(num_dups);
10885                 sack->ch.chunk_type = type;
10886                 sack->ch.chunk_flags = flags;
10887                 sack->ch.chunk_length = htons(a_chk->send_size);
10888         } else {
10889                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_nr_sack_chunk) +
10890                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10891                     num_dups * sizeof(int32_t));
10892                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10893                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10894                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10895                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10896                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10897                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10898                 nr_sack->nr_sack.reserved = 0;
10899                 nr_sack->ch.chunk_type = type;
10900                 nr_sack->ch.chunk_flags = flags;
10901                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10902         }
10903         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10904         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10905         asoc->ctrl_queue_cnt++;
10906         asoc->send_sack = 0;
10907         SCTP_STAT_INCR(sctps_sendsacks);
10908         return;
10909 }
10910
10911 void
10912 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10913 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10914     SCTP_UNUSED
10915 #endif
10916 )
10917 {
10918         struct mbuf *m_abort, *m, *m_last;
10919         struct mbuf *m_out, *m_end = NULL;
10920         struct sctp_abort_chunk *abort;
10921         struct sctp_auth_chunk *auth = NULL;
10922         struct sctp_nets *net;
10923         uint32_t vtag;
10924         uint32_t auth_offset = 0;
10925         uint16_t cause_len, chunk_len, padding_len;
10926
10927         SCTP_TCB_LOCK_ASSERT(stcb);
10928         /*-
10929          * Add an AUTH chunk, if chunk requires it and save the offset into
10930          * the chain for AUTH
10931          */
10932         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10933             stcb->asoc.peer_auth_chunks)) {
10934                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10935                     stcb, SCTP_ABORT_ASSOCIATION);
10936                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10937         } else {
10938                 m_out = NULL;
10939         }
10940         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10941         if (m_abort == NULL) {
10942                 if (m_out) {
10943                         sctp_m_freem(m_out);
10944                 }
10945                 if (operr) {
10946                         sctp_m_freem(operr);
10947                 }
10948                 return;
10949         }
10950         /* link in any error */
10951         SCTP_BUF_NEXT(m_abort) = operr;
10952         cause_len = 0;
10953         m_last = NULL;
10954         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10955                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10956                 if (SCTP_BUF_NEXT(m) == NULL) {
10957                         m_last = m;
10958                 }
10959         }
10960         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10961         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10962         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10963         if (m_out == NULL) {
10964                 /* NO Auth chunk prepended, so reserve space in front */
10965                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10966                 m_out = m_abort;
10967         } else {
10968                 /* Put AUTH chunk at the front of the chain */
10969                 SCTP_BUF_NEXT(m_end) = m_abort;
10970         }
10971         if (stcb->asoc.alternate) {
10972                 net = stcb->asoc.alternate;
10973         } else {
10974                 net = stcb->asoc.primary_destination;
10975         }
10976         /* Fill in the ABORT chunk header. */
10977         abort = mtod(m_abort, struct sctp_abort_chunk *);
10978         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10979         if (stcb->asoc.peer_vtag == 0) {
10980                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10981                 vtag = stcb->asoc.my_vtag;
10982                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10983         } else {
10984                 vtag = stcb->asoc.peer_vtag;
10985                 abort->ch.chunk_flags = 0;
10986         }
10987         abort->ch.chunk_length = htons(chunk_len);
10988         /* Add padding, if necessary. */
10989         if (padding_len > 0) {
10990                 if ((m_last == NULL) ||
10991                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10992                         sctp_m_freem(m_out);
10993                         return;
10994                 }
10995         }
10996         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10997             (struct sockaddr *)&net->ro._l_addr,
10998             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10999             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
11000             stcb->asoc.primary_destination->port, NULL,
11001             0, 0,
11002             so_locked);
11003         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11004 }
11005
11006 void
11007 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11008     struct sctp_nets *net,
11009     int reflect_vtag)
11010 {
11011         /* formulate and SEND a SHUTDOWN-COMPLETE */
11012         struct mbuf *m_shutdown_comp;
11013         struct sctp_shutdown_complete_chunk *shutdown_complete;
11014         uint32_t vtag;
11015         uint8_t flags;
11016
11017         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11018         if (m_shutdown_comp == NULL) {
11019                 /* no mbuf's */
11020                 return;
11021         }
11022         if (reflect_vtag) {
11023                 flags = SCTP_HAD_NO_TCB;
11024                 vtag = stcb->asoc.my_vtag;
11025         } else {
11026                 flags = 0;
11027                 vtag = stcb->asoc.peer_vtag;
11028         }
11029         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11030         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11031         shutdown_complete->ch.chunk_flags = flags;
11032         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11033         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11034         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11035             (struct sockaddr *)&net->ro._l_addr,
11036             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11037             stcb->sctp_ep->sctp_lport, stcb->rport,
11038             htonl(vtag),
11039             net->port, NULL,
11040             0, 0,
11041             SCTP_SO_NOT_LOCKED);
11042         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11043         return;
11044 }
11045
11046 static void
11047 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11048     struct sctphdr *sh, uint32_t vtag,
11049     uint8_t type, struct mbuf *cause,
11050     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11051     uint32_t vrf_id, uint16_t port)
11052 {
11053         struct mbuf *o_pak;
11054         struct mbuf *mout;
11055         struct sctphdr *shout;
11056         struct sctp_chunkhdr *ch;
11057
11058 #if defined(INET) || defined(INET6)
11059         struct udphdr *udp;
11060         int ret;
11061
11062 #endif
11063         int len, cause_len, padding_len;
11064
11065 #ifdef INET
11066         struct sockaddr_in *src_sin, *dst_sin;
11067         struct ip *ip;
11068
11069 #endif
11070 #ifdef INET6
11071         struct sockaddr_in6 *src_sin6, *dst_sin6;
11072         struct ip6_hdr *ip6;
11073
11074 #endif
11075
11076         /* Compute the length of the cause and add final padding. */
11077         cause_len = 0;
11078         if (cause != NULL) {
11079                 struct mbuf *m_at, *m_last = NULL;
11080
11081                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11082                         if (SCTP_BUF_NEXT(m_at) == NULL)
11083                                 m_last = m_at;
11084                         cause_len += SCTP_BUF_LEN(m_at);
11085                 }
11086                 padding_len = cause_len % 4;
11087                 if (padding_len != 0) {
11088                         padding_len = 4 - padding_len;
11089                 }
11090                 if (padding_len != 0) {
11091                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11092                                 sctp_m_freem(cause);
11093                                 return;
11094                         }
11095                 }
11096         } else {
11097                 padding_len = 0;
11098         }
11099         /* Get an mbuf for the header. */
11100         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11101         switch (dst->sa_family) {
11102 #ifdef INET
11103         case AF_INET:
11104                 len += sizeof(struct ip);
11105                 break;
11106 #endif
11107 #ifdef INET6
11108         case AF_INET6:
11109                 len += sizeof(struct ip6_hdr);
11110                 break;
11111 #endif
11112         default:
11113                 break;
11114         }
11115 #if defined(INET) || defined(INET6)
11116         if (port) {
11117                 len += sizeof(struct udphdr);
11118         }
11119 #endif
11120         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11121         if (mout == NULL) {
11122                 if (cause) {
11123                         sctp_m_freem(cause);
11124                 }
11125                 return;
11126         }
11127         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11128         SCTP_BUF_LEN(mout) = len;
11129         SCTP_BUF_NEXT(mout) = cause;
11130         M_SETFIB(mout, fibnum);
11131         mout->m_pkthdr.flowid = mflowid;
11132         M_HASHTYPE_SET(mout, mflowtype);
11133 #ifdef INET
11134         ip = NULL;
11135 #endif
11136 #ifdef INET6
11137         ip6 = NULL;
11138 #endif
11139         switch (dst->sa_family) {
11140 #ifdef INET
11141         case AF_INET:
11142                 src_sin = (struct sockaddr_in *)src;
11143                 dst_sin = (struct sockaddr_in *)dst;
11144                 ip = mtod(mout, struct ip *);
11145                 ip->ip_v = IPVERSION;
11146                 ip->ip_hl = (sizeof(struct ip) >> 2);
11147                 ip->ip_tos = 0;
11148                 ip->ip_off = 0;
11149                 ip_fillid(ip);
11150                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11151                 if (port) {
11152                         ip->ip_p = IPPROTO_UDP;
11153                 } else {
11154                         ip->ip_p = IPPROTO_SCTP;
11155                 }
11156                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11157                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11158                 ip->ip_sum = 0;
11159                 len = sizeof(struct ip);
11160                 shout = (struct sctphdr *)((caddr_t)ip + len);
11161                 break;
11162 #endif
11163 #ifdef INET6
11164         case AF_INET6:
11165                 src_sin6 = (struct sockaddr_in6 *)src;
11166                 dst_sin6 = (struct sockaddr_in6 *)dst;
11167                 ip6 = mtod(mout, struct ip6_hdr *);
11168                 ip6->ip6_flow = htonl(0x60000000);
11169                 if (V_ip6_auto_flowlabel) {
11170                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11171                 }
11172                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11173                 if (port) {
11174                         ip6->ip6_nxt = IPPROTO_UDP;
11175                 } else {
11176                         ip6->ip6_nxt = IPPROTO_SCTP;
11177                 }
11178                 ip6->ip6_src = dst_sin6->sin6_addr;
11179                 ip6->ip6_dst = src_sin6->sin6_addr;
11180                 len = sizeof(struct ip6_hdr);
11181                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11182                 break;
11183 #endif
11184         default:
11185                 len = 0;
11186                 shout = mtod(mout, struct sctphdr *);
11187                 break;
11188         }
11189 #if defined(INET) || defined(INET6)
11190         if (port) {
11191                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11192                         sctp_m_freem(mout);
11193                         return;
11194                 }
11195                 udp = (struct udphdr *)shout;
11196                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11197                 udp->uh_dport = port;
11198                 udp->uh_sum = 0;
11199                 udp->uh_ulen = htons((uint16_t) (sizeof(struct udphdr) +
11200                     sizeof(struct sctphdr) +
11201                     sizeof(struct sctp_chunkhdr) +
11202                     cause_len + padding_len));
11203                 len += sizeof(struct udphdr);
11204                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11205         } else {
11206                 udp = NULL;
11207         }
11208 #endif
11209         shout->src_port = sh->dest_port;
11210         shout->dest_port = sh->src_port;
11211         shout->checksum = 0;
11212         if (vtag) {
11213                 shout->v_tag = htonl(vtag);
11214         } else {
11215                 shout->v_tag = sh->v_tag;
11216         }
11217         len += sizeof(struct sctphdr);
11218         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11219         ch->chunk_type = type;
11220         if (vtag) {
11221                 ch->chunk_flags = 0;
11222         } else {
11223                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11224         }
11225         ch->chunk_length = htons((uint16_t) (sizeof(struct sctp_chunkhdr) + cause_len));
11226         len += sizeof(struct sctp_chunkhdr);
11227         len += cause_len + padding_len;
11228
11229         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11230                 sctp_m_freem(mout);
11231                 return;
11232         }
11233         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11234         switch (dst->sa_family) {
11235 #ifdef INET
11236         case AF_INET:
11237                 if (port) {
11238                         if (V_udp_cksum) {
11239                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11240                         } else {
11241                                 udp->uh_sum = 0;
11242                         }
11243                 }
11244                 ip->ip_len = htons(len);
11245                 if (port) {
11246 #if defined(SCTP_WITH_NO_CSUM)
11247                         SCTP_STAT_INCR(sctps_sendnocrc);
11248 #else
11249                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11250                         SCTP_STAT_INCR(sctps_sendswcrc);
11251 #endif
11252                         if (V_udp_cksum) {
11253                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11254                         }
11255                 } else {
11256 #if defined(SCTP_WITH_NO_CSUM)
11257                         SCTP_STAT_INCR(sctps_sendnocrc);
11258 #else
11259                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11260                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11261                         SCTP_STAT_INCR(sctps_sendhwcrc);
11262 #endif
11263                 }
11264 #ifdef SCTP_PACKET_LOGGING
11265                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11266                         sctp_packet_log(o_pak);
11267                 }
11268 #endif
11269                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11270                 break;
11271 #endif
11272 #ifdef INET6
11273         case AF_INET6:
11274                 ip6->ip6_plen = (uint16_t) (len - sizeof(struct ip6_hdr));
11275                 if (port) {
11276 #if defined(SCTP_WITH_NO_CSUM)
11277                         SCTP_STAT_INCR(sctps_sendnocrc);
11278 #else
11279                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11280                         SCTP_STAT_INCR(sctps_sendswcrc);
11281 #endif
11282                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11283                                 udp->uh_sum = 0xffff;
11284                         }
11285                 } else {
11286 #if defined(SCTP_WITH_NO_CSUM)
11287                         SCTP_STAT_INCR(sctps_sendnocrc);
11288 #else
11289                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11290                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11291                         SCTP_STAT_INCR(sctps_sendhwcrc);
11292 #endif
11293                 }
11294 #ifdef SCTP_PACKET_LOGGING
11295                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11296                         sctp_packet_log(o_pak);
11297                 }
11298 #endif
11299                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11300                 break;
11301 #endif
11302         default:
11303                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11304                     dst->sa_family);
11305                 sctp_m_freem(mout);
11306                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11307                 return;
11308         }
11309         SCTP_STAT_INCR(sctps_sendpackets);
11310         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11311         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11312         return;
11313 }
11314
11315 void
11316 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11317     struct sctphdr *sh,
11318     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11319     uint32_t vrf_id, uint16_t port)
11320 {
11321         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11322             mflowtype, mflowid, fibnum,
11323             vrf_id, port);
11324 }
11325
11326 void
11327 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11328 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11329     SCTP_UNUSED
11330 #endif
11331 )
11332 {
11333         struct sctp_tmit_chunk *chk;
11334         struct sctp_heartbeat_chunk *hb;
11335         struct timeval now;
11336
11337         SCTP_TCB_LOCK_ASSERT(stcb);
11338         if (net == NULL) {
11339                 return;
11340         }
11341         (void)SCTP_GETTIME_TIMEVAL(&now);
11342         switch (net->ro._l_addr.sa.sa_family) {
11343 #ifdef INET
11344         case AF_INET:
11345                 break;
11346 #endif
11347 #ifdef INET6
11348         case AF_INET6:
11349                 break;
11350 #endif
11351         default:
11352                 return;
11353         }
11354         sctp_alloc_a_chunk(stcb, chk);
11355         if (chk == NULL) {
11356                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11357                 return;
11358         }
11359         chk->copy_by_ref = 0;
11360         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11361         chk->rec.chunk_id.can_take_data = 1;
11362         chk->flags = 0;
11363         chk->asoc = &stcb->asoc;
11364         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11365
11366         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11367         if (chk->data == NULL) {
11368                 sctp_free_a_chunk(stcb, chk, so_locked);
11369                 return;
11370         }
11371         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11372         SCTP_BUF_LEN(chk->data) = chk->send_size;
11373         chk->sent = SCTP_DATAGRAM_UNSENT;
11374         chk->snd_count = 0;
11375         chk->whoTo = net;
11376         atomic_add_int(&chk->whoTo->ref_count, 1);
11377         /* Now we have a mbuf that we can fill in with the details */
11378         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11379         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11380         /* fill out chunk header */
11381         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11382         hb->ch.chunk_flags = 0;
11383         hb->ch.chunk_length = htons(chk->send_size);
11384         /* Fill out hb parameter */
11385         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11386         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11387         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11388         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11389         /* Did our user request this one, put it in */
11390         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11391         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11392         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11393                 /*
11394                  * we only take from the entropy pool if the address is not
11395                  * confirmed.
11396                  */
11397                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11398                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11399         } else {
11400                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11401                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11402         }
11403         switch (net->ro._l_addr.sa.sa_family) {
11404 #ifdef INET
11405         case AF_INET:
11406                 memcpy(hb->heartbeat.hb_info.address,
11407                     &net->ro._l_addr.sin.sin_addr,
11408                     sizeof(net->ro._l_addr.sin.sin_addr));
11409                 break;
11410 #endif
11411 #ifdef INET6
11412         case AF_INET6:
11413                 memcpy(hb->heartbeat.hb_info.address,
11414                     &net->ro._l_addr.sin6.sin6_addr,
11415                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11416                 break;
11417 #endif
11418         default:
11419                 if (chk->data) {
11420                         sctp_m_freem(chk->data);
11421                         chk->data = NULL;
11422                 }
11423                 sctp_free_a_chunk(stcb, chk, so_locked);
11424                 return;
11425                 break;
11426         }
11427         net->hb_responded = 0;
11428         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11429         stcb->asoc.ctrl_queue_cnt++;
11430         SCTP_STAT_INCR(sctps_sendheartbeat);
11431         return;
11432 }
11433
11434 void
11435 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11436     uint32_t high_tsn)
11437 {
11438         struct sctp_association *asoc;
11439         struct sctp_ecne_chunk *ecne;
11440         struct sctp_tmit_chunk *chk;
11441
11442         if (net == NULL) {
11443                 return;
11444         }
11445         asoc = &stcb->asoc;
11446         SCTP_TCB_LOCK_ASSERT(stcb);
11447         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11448                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11449                         /* found a previous ECN_ECHO update it if needed */
11450                         uint32_t cnt, ctsn;
11451
11452                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11453                         ctsn = ntohl(ecne->tsn);
11454                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11455                                 ecne->tsn = htonl(high_tsn);
11456                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11457                         }
11458                         cnt = ntohl(ecne->num_pkts_since_cwr);
11459                         cnt++;
11460                         ecne->num_pkts_since_cwr = htonl(cnt);
11461                         return;
11462                 }
11463         }
11464         /* nope could not find one to update so we must build one */
11465         sctp_alloc_a_chunk(stcb, chk);
11466         if (chk == NULL) {
11467                 return;
11468         }
11469         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11470         chk->copy_by_ref = 0;
11471         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11472         chk->rec.chunk_id.can_take_data = 0;
11473         chk->flags = 0;
11474         chk->asoc = &stcb->asoc;
11475         chk->send_size = sizeof(struct sctp_ecne_chunk);
11476         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11477         if (chk->data == NULL) {
11478                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11479                 return;
11480         }
11481         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11482         SCTP_BUF_LEN(chk->data) = chk->send_size;
11483         chk->sent = SCTP_DATAGRAM_UNSENT;
11484         chk->snd_count = 0;
11485         chk->whoTo = net;
11486         atomic_add_int(&chk->whoTo->ref_count, 1);
11487
11488         stcb->asoc.ecn_echo_cnt_onq++;
11489         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11490         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11491         ecne->ch.chunk_flags = 0;
11492         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11493         ecne->tsn = htonl(high_tsn);
11494         ecne->num_pkts_since_cwr = htonl(1);
11495         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11496         asoc->ctrl_queue_cnt++;
11497 }
11498
11499 void
11500 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11501     struct mbuf *m, int len, int iphlen, int bad_crc)
11502 {
11503         struct sctp_association *asoc;
11504         struct sctp_pktdrop_chunk *drp;
11505         struct sctp_tmit_chunk *chk;
11506         uint8_t *datap;
11507         int was_trunc = 0;
11508         int fullsz = 0;
11509         long spc;
11510         int offset;
11511         struct sctp_chunkhdr *ch, chunk_buf;
11512         unsigned int chk_length;
11513
11514         if (!stcb) {
11515                 return;
11516         }
11517         asoc = &stcb->asoc;
11518         SCTP_TCB_LOCK_ASSERT(stcb);
11519         if (asoc->pktdrop_supported == 0) {
11520                 /*-
11521                  * peer must declare support before I send one.
11522                  */
11523                 return;
11524         }
11525         if (stcb->sctp_socket == NULL) {
11526                 return;
11527         }
11528         sctp_alloc_a_chunk(stcb, chk);
11529         if (chk == NULL) {
11530                 return;
11531         }
11532         chk->copy_by_ref = 0;
11533         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11534         chk->rec.chunk_id.can_take_data = 1;
11535         chk->flags = 0;
11536         len -= iphlen;
11537         chk->send_size = len;
11538         /* Validate that we do not have an ABORT in here. */
11539         offset = iphlen + sizeof(struct sctphdr);
11540         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11541             sizeof(*ch), (uint8_t *) & chunk_buf);
11542         while (ch != NULL) {
11543                 chk_length = ntohs(ch->chunk_length);
11544                 if (chk_length < sizeof(*ch)) {
11545                         /* break to abort land */
11546                         break;
11547                 }
11548                 switch (ch->chunk_type) {
11549                 case SCTP_PACKET_DROPPED:
11550                 case SCTP_ABORT_ASSOCIATION:
11551                 case SCTP_INITIATION_ACK:
11552                         /**
11553                          * We don't respond with an PKT-DROP to an ABORT
11554                          * or PKT-DROP. We also do not respond to an
11555                          * INIT-ACK, because we can't know if the initiation
11556                          * tag is correct or not.
11557                          */
11558                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11559                         return;
11560                 default:
11561                         break;
11562                 }
11563                 offset += SCTP_SIZE32(chk_length);
11564                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11565                     sizeof(*ch), (uint8_t *) & chunk_buf);
11566         }
11567
11568         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11569             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11570                 /*
11571                  * only send 1 mtu worth, trim off the excess on the end.
11572                  */
11573                 fullsz = len;
11574                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11575                 was_trunc = 1;
11576         }
11577         chk->asoc = &stcb->asoc;
11578         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11579         if (chk->data == NULL) {
11580 jump_out:
11581                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11582                 return;
11583         }
11584         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11585         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11586         if (drp == NULL) {
11587                 sctp_m_freem(chk->data);
11588                 chk->data = NULL;
11589                 goto jump_out;
11590         }
11591         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11592             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11593         chk->book_size_scale = 0;
11594         if (was_trunc) {
11595                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11596                 drp->trunc_len = htons(fullsz);
11597                 /*
11598                  * Len is already adjusted to size minus overhead above take
11599                  * out the pkt_drop chunk itself from it.
11600                  */
11601                 chk->send_size = (uint16_t) (len - sizeof(struct sctp_pktdrop_chunk));
11602                 len = chk->send_size;
11603         } else {
11604                 /* no truncation needed */
11605                 drp->ch.chunk_flags = 0;
11606                 drp->trunc_len = htons(0);
11607         }
11608         if (bad_crc) {
11609                 drp->ch.chunk_flags |= SCTP_BADCRC;
11610         }
11611         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11612         SCTP_BUF_LEN(chk->data) = chk->send_size;
11613         chk->sent = SCTP_DATAGRAM_UNSENT;
11614         chk->snd_count = 0;
11615         if (net) {
11616                 /* we should hit here */
11617                 chk->whoTo = net;
11618                 atomic_add_int(&chk->whoTo->ref_count, 1);
11619         } else {
11620                 chk->whoTo = NULL;
11621         }
11622         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11623         drp->ch.chunk_length = htons(chk->send_size);
11624         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11625         if (spc < 0) {
11626                 spc = 0;
11627         }
11628         drp->bottle_bw = htonl(spc);
11629         if (asoc->my_rwnd) {
11630                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11631                     asoc->size_on_all_streams +
11632                     asoc->my_rwnd_control_len +
11633                     stcb->sctp_socket->so_rcv.sb_cc);
11634         } else {
11635                 /*-
11636                  * If my rwnd is 0, possibly from mbuf depletion as well as
11637                  * space used, tell the peer there is NO space aka onq == bw
11638                  */
11639                 drp->current_onq = htonl(spc);
11640         }
11641         drp->reserved = 0;
11642         datap = drp->data;
11643         m_copydata(m, iphlen, len, (caddr_t)datap);
11644         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11645         asoc->ctrl_queue_cnt++;
11646 }
11647
11648 void
11649 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11650 {
11651         struct sctp_association *asoc;
11652         struct sctp_cwr_chunk *cwr;
11653         struct sctp_tmit_chunk *chk;
11654
11655         SCTP_TCB_LOCK_ASSERT(stcb);
11656         if (net == NULL) {
11657                 return;
11658         }
11659         asoc = &stcb->asoc;
11660         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11661                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11662                         /*
11663                          * found a previous CWR queued to same destination
11664                          * update it if needed
11665                          */
11666                         uint32_t ctsn;
11667
11668                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11669                         ctsn = ntohl(cwr->tsn);
11670                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11671                                 cwr->tsn = htonl(high_tsn);
11672                         }
11673                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11674                                 /* Make sure override is carried */
11675                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11676                         }
11677                         return;
11678                 }
11679         }
11680         sctp_alloc_a_chunk(stcb, chk);
11681         if (chk == NULL) {
11682                 return;
11683         }
11684         chk->copy_by_ref = 0;
11685         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11686         chk->rec.chunk_id.can_take_data = 1;
11687         chk->flags = 0;
11688         chk->asoc = &stcb->asoc;
11689         chk->send_size = sizeof(struct sctp_cwr_chunk);
11690         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11691         if (chk->data == NULL) {
11692                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11693                 return;
11694         }
11695         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11696         SCTP_BUF_LEN(chk->data) = chk->send_size;
11697         chk->sent = SCTP_DATAGRAM_UNSENT;
11698         chk->snd_count = 0;
11699         chk->whoTo = net;
11700         atomic_add_int(&chk->whoTo->ref_count, 1);
11701         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11702         cwr->ch.chunk_type = SCTP_ECN_CWR;
11703         cwr->ch.chunk_flags = override;
11704         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11705         cwr->tsn = htonl(high_tsn);
11706         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11707         asoc->ctrl_queue_cnt++;
11708 }
11709
11710 static int
11711 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11712     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11713 {
11714         uint16_t len, old_len, i;
11715         struct sctp_stream_reset_out_request *req_out;
11716         struct sctp_chunkhdr *ch;
11717         int at;
11718         int number_entries = 0;
11719
11720         ch = mtod(chk->data, struct sctp_chunkhdr *);
11721         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11722         /* get to new offset for the param. */
11723         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11724         /* now how long will this param be? */
11725         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11726                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11727                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11728                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11729                         number_entries++;
11730                 }
11731         }
11732         if (number_entries == 0) {
11733                 return (0);
11734         }
11735         if (number_entries == stcb->asoc.streamoutcnt) {
11736                 number_entries = 0;
11737         }
11738         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11739                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11740         }
11741         len = (uint16_t) (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11742         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11743         req_out->ph.param_length = htons(len);
11744         req_out->request_seq = htonl(seq);
11745         req_out->response_seq = htonl(resp_seq);
11746         req_out->send_reset_at_tsn = htonl(last_sent);
11747         at = 0;
11748         if (number_entries) {
11749                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11750                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11751                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11752                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11753                                 req_out->list_of_streams[at] = htons(i);
11754                                 at++;
11755                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11756                                 if (at >= number_entries) {
11757                                         break;
11758                                 }
11759                         }
11760                 }
11761         } else {
11762                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11763                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11764                 }
11765         }
11766         if (SCTP_SIZE32(len) > len) {
11767                 /*-
11768                  * Need to worry about the pad we may end up adding to the
11769                  * end. This is easy since the struct is either aligned to 4
11770                  * bytes or 2 bytes off.
11771                  */
11772                 req_out->list_of_streams[number_entries] = 0;
11773         }
11774         /* now fix the chunk length */
11775         ch->chunk_length = htons(len + old_len);
11776         chk->book_size = len + old_len;
11777         chk->book_size_scale = 0;
11778         chk->send_size = SCTP_SIZE32(chk->book_size);
11779         SCTP_BUF_LEN(chk->data) = chk->send_size;
11780         return (1);
11781 }
11782
11783 static void
11784 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11785     int number_entries, uint16_t * list,
11786     uint32_t seq)
11787 {
11788         uint16_t len, old_len, i;
11789         struct sctp_stream_reset_in_request *req_in;
11790         struct sctp_chunkhdr *ch;
11791
11792         ch = mtod(chk->data, struct sctp_chunkhdr *);
11793         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11794
11795         /* get to new offset for the param. */
11796         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11797         /* now how long will this param be? */
11798         len = (uint16_t) (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11799         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11800         req_in->ph.param_length = htons(len);
11801         req_in->request_seq = htonl(seq);
11802         if (number_entries) {
11803                 for (i = 0; i < number_entries; i++) {
11804                         req_in->list_of_streams[i] = htons(list[i]);
11805                 }
11806         }
11807         if (SCTP_SIZE32(len) > len) {
11808                 /*-
11809                  * Need to worry about the pad we may end up adding to the
11810                  * end. This is easy since the struct is either aligned to 4
11811                  * bytes or 2 bytes off.
11812                  */
11813                 req_in->list_of_streams[number_entries] = 0;
11814         }
11815         /* now fix the chunk length */
11816         ch->chunk_length = htons(len + old_len);
11817         chk->book_size = len + old_len;
11818         chk->book_size_scale = 0;
11819         chk->send_size = SCTP_SIZE32(chk->book_size);
11820         SCTP_BUF_LEN(chk->data) = chk->send_size;
11821         return;
11822 }
11823
11824 static void
11825 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11826     uint32_t seq)
11827 {
11828         uint16_t len, old_len;
11829         struct sctp_stream_reset_tsn_request *req_tsn;
11830         struct sctp_chunkhdr *ch;
11831
11832         ch = mtod(chk->data, struct sctp_chunkhdr *);
11833         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11834
11835         /* get to new offset for the param. */
11836         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11837         /* now how long will this param be? */
11838         len = sizeof(struct sctp_stream_reset_tsn_request);
11839         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11840         req_tsn->ph.param_length = htons(len);
11841         req_tsn->request_seq = htonl(seq);
11842
11843         /* now fix the chunk length */
11844         ch->chunk_length = htons(len + old_len);
11845         chk->send_size = len + old_len;
11846         chk->book_size = SCTP_SIZE32(chk->send_size);
11847         chk->book_size_scale = 0;
11848         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11849         return;
11850 }
11851
11852 void
11853 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11854     uint32_t resp_seq, uint32_t result)
11855 {
11856         uint16_t len, old_len;
11857         struct sctp_stream_reset_response *resp;
11858         struct sctp_chunkhdr *ch;
11859
11860         ch = mtod(chk->data, struct sctp_chunkhdr *);
11861         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11862
11863         /* get to new offset for the param. */
11864         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11865         /* now how long will this param be? */
11866         len = sizeof(struct sctp_stream_reset_response);
11867         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11868         resp->ph.param_length = htons(len);
11869         resp->response_seq = htonl(resp_seq);
11870         resp->result = ntohl(result);
11871
11872         /* now fix the chunk length */
11873         ch->chunk_length = htons(len + old_len);
11874         chk->book_size = len + old_len;
11875         chk->book_size_scale = 0;
11876         chk->send_size = SCTP_SIZE32(chk->book_size);
11877         SCTP_BUF_LEN(chk->data) = chk->send_size;
11878         return;
11879 }
11880
11881 void
11882 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11883     struct sctp_stream_reset_list *ent,
11884     int response)
11885 {
11886         struct sctp_association *asoc;
11887         struct sctp_tmit_chunk *chk;
11888         struct sctp_chunkhdr *ch;
11889
11890         asoc = &stcb->asoc;
11891
11892         /*
11893          * Reset our last reset action to the new one IP -> response
11894          * (PERFORMED probably). This assures that if we fail to send, a
11895          * retran from the peer will get the new response.
11896          */
11897         asoc->last_reset_action[0] = response;
11898         if (asoc->stream_reset_outstanding) {
11899                 return;
11900         }
11901         sctp_alloc_a_chunk(stcb, chk);
11902         if (chk == NULL) {
11903                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11904                 return;
11905         }
11906         chk->copy_by_ref = 0;
11907         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11908         chk->rec.chunk_id.can_take_data = 0;
11909         chk->flags = 0;
11910         chk->asoc = &stcb->asoc;
11911         chk->book_size = sizeof(struct sctp_chunkhdr);
11912         chk->send_size = SCTP_SIZE32(chk->book_size);
11913         chk->book_size_scale = 0;
11914         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11915         if (chk->data == NULL) {
11916                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11917                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11918                 return;
11919         }
11920         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11921         sctp_add_stream_reset_result(chk, ent->seq, response);
11922         /* setup chunk parameters */
11923         chk->sent = SCTP_DATAGRAM_UNSENT;
11924         chk->snd_count = 0;
11925         if (stcb->asoc.alternate) {
11926                 chk->whoTo = stcb->asoc.alternate;
11927         } else {
11928                 chk->whoTo = stcb->asoc.primary_destination;
11929         }
11930         ch = mtod(chk->data, struct sctp_chunkhdr *);
11931         ch->chunk_type = SCTP_STREAM_RESET;
11932         ch->chunk_flags = 0;
11933         ch->chunk_length = htons(chk->book_size);
11934         atomic_add_int(&chk->whoTo->ref_count, 1);
11935         SCTP_BUF_LEN(chk->data) = chk->send_size;
11936         /* insert the chunk for sending */
11937         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11938             chk,
11939             sctp_next);
11940         asoc->ctrl_queue_cnt++;
11941 }
11942
11943 void
11944 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11945     uint32_t resp_seq, uint32_t result,
11946     uint32_t send_una, uint32_t recv_next)
11947 {
11948         uint16_t len, old_len;
11949         struct sctp_stream_reset_response_tsn *resp;
11950         struct sctp_chunkhdr *ch;
11951
11952         ch = mtod(chk->data, struct sctp_chunkhdr *);
11953         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11954
11955         /* get to new offset for the param. */
11956         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11957         /* now how long will this param be? */
11958         len = sizeof(struct sctp_stream_reset_response_tsn);
11959         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11960         resp->ph.param_length = htons(len);
11961         resp->response_seq = htonl(resp_seq);
11962         resp->result = htonl(result);
11963         resp->senders_next_tsn = htonl(send_una);
11964         resp->receivers_next_tsn = htonl(recv_next);
11965
11966         /* now fix the chunk length */
11967         ch->chunk_length = htons(len + old_len);
11968         chk->book_size = len + old_len;
11969         chk->send_size = SCTP_SIZE32(chk->book_size);
11970         chk->book_size_scale = 0;
11971         SCTP_BUF_LEN(chk->data) = chk->send_size;
11972         return;
11973 }
11974
11975 static void
11976 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11977     uint32_t seq,
11978     uint16_t adding)
11979 {
11980         uint16_t len, old_len;
11981         struct sctp_chunkhdr *ch;
11982         struct sctp_stream_reset_add_strm *addstr;
11983
11984         ch = mtod(chk->data, struct sctp_chunkhdr *);
11985         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11986
11987         /* get to new offset for the param. */
11988         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11989         /* now how long will this param be? */
11990         len = sizeof(struct sctp_stream_reset_add_strm);
11991
11992         /* Fill it out. */
11993         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11994         addstr->ph.param_length = htons(len);
11995         addstr->request_seq = htonl(seq);
11996         addstr->number_of_streams = htons(adding);
11997         addstr->reserved = 0;
11998
11999         /* now fix the chunk length */
12000         ch->chunk_length = htons(len + old_len);
12001         chk->send_size = len + old_len;
12002         chk->book_size = SCTP_SIZE32(chk->send_size);
12003         chk->book_size_scale = 0;
12004         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12005         return;
12006 }
12007
12008 static void
12009 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12010     uint32_t seq,
12011     uint16_t adding)
12012 {
12013         uint16_t len, old_len;
12014         struct sctp_chunkhdr *ch;
12015         struct sctp_stream_reset_add_strm *addstr;
12016
12017         ch = mtod(chk->data, struct sctp_chunkhdr *);
12018         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12019
12020         /* get to new offset for the param. */
12021         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12022         /* now how long will this param be? */
12023         len = sizeof(struct sctp_stream_reset_add_strm);
12024         /* Fill it out. */
12025         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12026         addstr->ph.param_length = htons(len);
12027         addstr->request_seq = htonl(seq);
12028         addstr->number_of_streams = htons(adding);
12029         addstr->reserved = 0;
12030
12031         /* now fix the chunk length */
12032         ch->chunk_length = htons(len + old_len);
12033         chk->send_size = len + old_len;
12034         chk->book_size = SCTP_SIZE32(chk->send_size);
12035         chk->book_size_scale = 0;
12036         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12037         return;
12038 }
12039
12040 int
12041 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12042 {
12043         struct sctp_association *asoc;
12044         struct sctp_tmit_chunk *chk;
12045         struct sctp_chunkhdr *ch;
12046         uint32_t seq;
12047
12048         asoc = &stcb->asoc;
12049         asoc->trigger_reset = 0;
12050         if (asoc->stream_reset_outstanding) {
12051                 return (EALREADY);
12052         }
12053         sctp_alloc_a_chunk(stcb, chk);
12054         if (chk == NULL) {
12055                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12056                 return (ENOMEM);
12057         }
12058         chk->copy_by_ref = 0;
12059         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12060         chk->rec.chunk_id.can_take_data = 0;
12061         chk->flags = 0;
12062         chk->asoc = &stcb->asoc;
12063         chk->book_size = sizeof(struct sctp_chunkhdr);
12064         chk->send_size = SCTP_SIZE32(chk->book_size);
12065         chk->book_size_scale = 0;
12066         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12067         if (chk->data == NULL) {
12068                 sctp_free_a_chunk(stcb, chk, so_locked);
12069                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12070                 return (ENOMEM);
12071         }
12072         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12073
12074         /* setup chunk parameters */
12075         chk->sent = SCTP_DATAGRAM_UNSENT;
12076         chk->snd_count = 0;
12077         if (stcb->asoc.alternate) {
12078                 chk->whoTo = stcb->asoc.alternate;
12079         } else {
12080                 chk->whoTo = stcb->asoc.primary_destination;
12081         }
12082         ch = mtod(chk->data, struct sctp_chunkhdr *);
12083         ch->chunk_type = SCTP_STREAM_RESET;
12084         ch->chunk_flags = 0;
12085         ch->chunk_length = htons(chk->book_size);
12086         atomic_add_int(&chk->whoTo->ref_count, 1);
12087         SCTP_BUF_LEN(chk->data) = chk->send_size;
12088         seq = stcb->asoc.str_reset_seq_out;
12089         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12090                 seq++;
12091                 asoc->stream_reset_outstanding++;
12092         } else {
12093                 m_freem(chk->data);
12094                 chk->data = NULL;
12095                 sctp_free_a_chunk(stcb, chk, so_locked);
12096                 return (ENOENT);
12097         }
12098         asoc->str_reset = chk;
12099         /* insert the chunk for sending */
12100         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12101             chk,
12102             sctp_next);
12103         asoc->ctrl_queue_cnt++;
12104
12105         if (stcb->asoc.send_sack) {
12106                 sctp_send_sack(stcb, so_locked);
12107         }
12108         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12109         return (0);
12110 }
12111
12112 int
12113 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12114     uint16_t number_entries, uint16_t * list,
12115     uint8_t send_in_req,
12116     uint8_t send_tsn_req,
12117     uint8_t add_stream,
12118     uint16_t adding_o,
12119     uint16_t adding_i, uint8_t peer_asked)
12120 {
12121         struct sctp_association *asoc;
12122         struct sctp_tmit_chunk *chk;
12123         struct sctp_chunkhdr *ch;
12124         int can_send_out_req = 0;
12125         uint32_t seq;
12126
12127         asoc = &stcb->asoc;
12128         if (asoc->stream_reset_outstanding) {
12129                 /*-
12130                  * Already one pending, must get ACK back to clear the flag.
12131                  */
12132                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12133                 return (EBUSY);
12134         }
12135         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12136             (add_stream == 0)) {
12137                 /* nothing to do */
12138                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12139                 return (EINVAL);
12140         }
12141         if (send_tsn_req && send_in_req) {
12142                 /* error, can't do that */
12143                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12144                 return (EINVAL);
12145         } else if (send_in_req) {
12146                 can_send_out_req = 1;
12147         }
12148         if (number_entries > (MCLBYTES -
12149             SCTP_MIN_OVERHEAD -
12150             sizeof(struct sctp_chunkhdr) -
12151             sizeof(struct sctp_stream_reset_out_request)) /
12152             sizeof(uint16_t)) {
12153                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12154                 return (ENOMEM);
12155         }
12156         sctp_alloc_a_chunk(stcb, chk);
12157         if (chk == NULL) {
12158                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12159                 return (ENOMEM);
12160         }
12161         chk->copy_by_ref = 0;
12162         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12163         chk->rec.chunk_id.can_take_data = 0;
12164         chk->flags = 0;
12165         chk->asoc = &stcb->asoc;
12166         chk->book_size = sizeof(struct sctp_chunkhdr);
12167         chk->send_size = SCTP_SIZE32(chk->book_size);
12168         chk->book_size_scale = 0;
12169
12170         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12171         if (chk->data == NULL) {
12172                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12173                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12174                 return (ENOMEM);
12175         }
12176         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12177
12178         /* setup chunk parameters */
12179         chk->sent = SCTP_DATAGRAM_UNSENT;
12180         chk->snd_count = 0;
12181         if (stcb->asoc.alternate) {
12182                 chk->whoTo = stcb->asoc.alternate;
12183         } else {
12184                 chk->whoTo = stcb->asoc.primary_destination;
12185         }
12186         atomic_add_int(&chk->whoTo->ref_count, 1);
12187         ch = mtod(chk->data, struct sctp_chunkhdr *);
12188         ch->chunk_type = SCTP_STREAM_RESET;
12189         ch->chunk_flags = 0;
12190         ch->chunk_length = htons(chk->book_size);
12191         SCTP_BUF_LEN(chk->data) = chk->send_size;
12192
12193         seq = stcb->asoc.str_reset_seq_out;
12194         if (can_send_out_req) {
12195                 int ret;
12196
12197                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12198                 if (ret) {
12199                         seq++;
12200                         asoc->stream_reset_outstanding++;
12201                 }
12202         }
12203         if ((add_stream & 1) &&
12204             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12205                 /* Need to allocate more */
12206                 struct sctp_stream_out *oldstream;
12207                 struct sctp_stream_queue_pending *sp, *nsp;
12208                 int i;
12209
12210 #if defined(SCTP_DETAILED_STR_STATS)
12211                 int j;
12212
12213 #endif
12214
12215                 oldstream = stcb->asoc.strmout;
12216                 /* get some more */
12217                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12218                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12219                     SCTP_M_STRMO);
12220                 if (stcb->asoc.strmout == NULL) {
12221                         uint8_t x;
12222
12223                         stcb->asoc.strmout = oldstream;
12224                         /* Turn off the bit */
12225                         x = add_stream & 0xfe;
12226                         add_stream = x;
12227                         goto skip_stuff;
12228                 }
12229                 /*
12230                  * Ok now we proceed with copying the old out stuff and
12231                  * initializing the new stuff.
12232                  */
12233                 SCTP_TCB_SEND_LOCK(stcb);
12234                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12235                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12236                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12237                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12238                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
12239                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12240                         stcb->asoc.strmout[i].stream_no = i;
12241                         stcb->asoc.strmout[i].state = oldstream[i].state;
12242                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12243                         /* now anything on those queues? */
12244                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12245                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12246                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12247                         }
12248                         /* Now move assoc pointers too */
12249                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12250                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12251                         }
12252                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12253                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12254                         }
12255                 }
12256                 /* now the new streams */
12257                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12258                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12259                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12260                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12261 #if defined(SCTP_DETAILED_STR_STATS)
12262                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12263                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12264                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12265                         }
12266 #else
12267                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12268                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12269 #endif
12270                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12271                         stcb->asoc.strmout[i].stream_no = i;
12272                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12273                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12274                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12275                 }
12276                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12277                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12278                 SCTP_TCB_SEND_UNLOCK(stcb);
12279         }
12280 skip_stuff:
12281         if ((add_stream & 1) && (adding_o > 0)) {
12282                 asoc->strm_pending_add_size = adding_o;
12283                 asoc->peer_req_out = peer_asked;
12284                 sctp_add_an_out_stream(chk, seq, adding_o);
12285                 seq++;
12286                 asoc->stream_reset_outstanding++;
12287         }
12288         if ((add_stream & 2) && (adding_i > 0)) {
12289                 sctp_add_an_in_stream(chk, seq, adding_i);
12290                 seq++;
12291                 asoc->stream_reset_outstanding++;
12292         }
12293         if (send_in_req) {
12294                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12295                 seq++;
12296                 asoc->stream_reset_outstanding++;
12297         }
12298         if (send_tsn_req) {
12299                 sctp_add_stream_reset_tsn(chk, seq);
12300                 asoc->stream_reset_outstanding++;
12301         }
12302         asoc->str_reset = chk;
12303         /* insert the chunk for sending */
12304         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12305             chk,
12306             sctp_next);
12307         asoc->ctrl_queue_cnt++;
12308         if (stcb->asoc.send_sack) {
12309                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12310         }
12311         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12312         return (0);
12313 }
12314
12315 void
12316 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12317     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12318     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12319     uint32_t vrf_id, uint16_t port)
12320 {
12321         /* Don't respond to an ABORT with an ABORT. */
12322         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12323                 if (cause)
12324                         sctp_m_freem(cause);
12325                 return;
12326         }
12327         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12328             mflowtype, mflowid, fibnum,
12329             vrf_id, port);
12330         return;
12331 }
12332
12333 void
12334 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12335     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12336     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12337     uint32_t vrf_id, uint16_t port)
12338 {
12339         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12340             mflowtype, mflowid, fibnum,
12341             vrf_id, port);
12342         return;
12343 }
12344
12345 static struct mbuf *
12346 sctp_copy_resume(struct uio *uio,
12347     int max_send_len,
12348     int user_marks_eor,
12349     int *error,
12350     uint32_t * sndout,
12351     struct mbuf **new_tail)
12352 {
12353         struct mbuf *m;
12354
12355         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12356             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12357         if (m == NULL) {
12358                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12359                 *error = ENOBUFS;
12360         } else {
12361                 *sndout = m_length(m, NULL);
12362                 *new_tail = m_last(m);
12363         }
12364         return (m);
12365 }
12366
12367 static int
12368 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12369     struct uio *uio,
12370     int resv_upfront)
12371 {
12372         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12373             resv_upfront, 0);
12374         if (sp->data == NULL) {
12375                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12376                 return (ENOBUFS);
12377         }
12378         sp->tail_mbuf = m_last(sp->data);
12379         return (0);
12380 }
12381
12382
12383
12384 static struct sctp_stream_queue_pending *
12385 sctp_copy_it_in(struct sctp_tcb *stcb,
12386     struct sctp_association *asoc,
12387     struct sctp_sndrcvinfo *srcv,
12388     struct uio *uio,
12389     struct sctp_nets *net,
12390     int max_send_len,
12391     int user_marks_eor,
12392     int *error)
12393 {
12394         /*-
12395          * This routine must be very careful in its work. Protocol
12396          * processing is up and running so care must be taken to spl...()
12397          * when you need to do something that may effect the stcb/asoc. The
12398          * sb is locked however. When data is copied the protocol processing
12399          * should be enabled since this is a slower operation...
12400          */
12401         struct sctp_stream_queue_pending *sp = NULL;
12402         int resv_in_first;
12403
12404         *error = 0;
12405         /* Now can we send this? */
12406         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12407             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12408             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12409             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12410                 /* got data while shutting down */
12411                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12412                 *error = ECONNRESET;
12413                 goto out_now;
12414         }
12415         sctp_alloc_a_strmoq(stcb, sp);
12416         if (sp == NULL) {
12417                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12418                 *error = ENOMEM;
12419                 goto out_now;
12420         }
12421         sp->act_flags = 0;
12422         sp->sender_all_done = 0;
12423         sp->sinfo_flags = srcv->sinfo_flags;
12424         sp->timetolive = srcv->sinfo_timetolive;
12425         sp->ppid = srcv->sinfo_ppid;
12426         sp->context = srcv->sinfo_context;
12427         sp->fsn = 0;
12428         sp->msg_id = atomic_fetchadd_int(&stcb->asoc.assoc_msg_id, 1);
12429         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12430
12431         sp->stream = srcv->sinfo_stream;
12432         sp->length = (uint32_t) min(uio->uio_resid, max_send_len);
12433         if ((sp->length == (uint32_t) uio->uio_resid) &&
12434             ((user_marks_eor == 0) ||
12435             (srcv->sinfo_flags & SCTP_EOF) ||
12436             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12437                 sp->msg_is_complete = 1;
12438         } else {
12439                 sp->msg_is_complete = 0;
12440         }
12441         sp->sender_all_done = 0;
12442         sp->some_taken = 0;
12443         sp->put_last_out = 0;
12444         resv_in_first = sizeof(struct sctp_data_chunk);
12445         sp->data = sp->tail_mbuf = NULL;
12446         if (sp->length == 0) {
12447                 *error = 0;
12448                 goto skip_copy;
12449         }
12450         if (srcv->sinfo_keynumber_valid) {
12451                 sp->auth_keyid = srcv->sinfo_keynumber;
12452         } else {
12453                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12454         }
12455         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12456                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12457                 sp->holds_key_ref = 1;
12458         }
12459         *error = sctp_copy_one(sp, uio, resv_in_first);
12460 skip_copy:
12461         if (*error) {
12462                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12463                 sp = NULL;
12464         } else {
12465                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12466                         sp->net = net;
12467                         atomic_add_int(&sp->net->ref_count, 1);
12468                 } else {
12469                         sp->net = NULL;
12470                 }
12471                 sctp_set_prsctp_policy(sp);
12472         }
12473 out_now:
12474         return (sp);
12475 }
12476
12477
12478 int
12479 sctp_sosend(struct socket *so,
12480     struct sockaddr *addr,
12481     struct uio *uio,
12482     struct mbuf *top,
12483     struct mbuf *control,
12484     int flags,
12485     struct thread *p
12486 )
12487 {
12488         int error, use_sndinfo = 0;
12489         struct sctp_sndrcvinfo sndrcvninfo;
12490         struct sockaddr *addr_to_use;
12491
12492 #if defined(INET) && defined(INET6)
12493         struct sockaddr_in sin;
12494
12495 #endif
12496
12497         if (control) {
12498                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12499                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12500                     sizeof(sndrcvninfo))) {
12501                         /* got one */
12502                         use_sndinfo = 1;
12503                 }
12504         }
12505         addr_to_use = addr;
12506 #if defined(INET) && defined(INET6)
12507         if ((addr) && (addr->sa_family == AF_INET6)) {
12508                 struct sockaddr_in6 *sin6;
12509
12510                 sin6 = (struct sockaddr_in6 *)addr;
12511                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12512                         in6_sin6_2_sin(&sin, sin6);
12513                         addr_to_use = (struct sockaddr *)&sin;
12514                 }
12515         }
12516 #endif
12517         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12518             control,
12519             flags,
12520             use_sndinfo ? &sndrcvninfo : NULL
12521             ,p
12522             );
12523         return (error);
12524 }
12525
12526
12527 int
12528 sctp_lower_sosend(struct socket *so,
12529     struct sockaddr *addr,
12530     struct uio *uio,
12531     struct mbuf *i_pak,
12532     struct mbuf *control,
12533     int flags,
12534     struct sctp_sndrcvinfo *srcv
12535     ,
12536     struct thread *p
12537 )
12538 {
12539         unsigned int sndlen = 0, max_len;
12540         int error, len;
12541         struct mbuf *top = NULL;
12542         int queue_only = 0, queue_only_for_init = 0;
12543         int free_cnt_applied = 0;
12544         int un_sent;
12545         int now_filled = 0;
12546         unsigned int inqueue_bytes = 0;
12547         struct sctp_block_entry be;
12548         struct sctp_inpcb *inp;
12549         struct sctp_tcb *stcb = NULL;
12550         struct timeval now;
12551         struct sctp_nets *net;
12552         struct sctp_association *asoc;
12553         struct sctp_inpcb *t_inp;
12554         int user_marks_eor;
12555         int create_lock_applied = 0;
12556         int nagle_applies = 0;
12557         int some_on_control = 0;
12558         int got_all_of_the_send = 0;
12559         int hold_tcblock = 0;
12560         int non_blocking = 0;
12561         uint32_t local_add_more, local_soresv = 0;
12562         uint16_t port;
12563         uint16_t sinfo_flags;
12564         sctp_assoc_t sinfo_assoc_id;
12565
12566         error = 0;
12567         net = NULL;
12568         stcb = NULL;
12569         asoc = NULL;
12570
12571         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12572         if (inp == NULL) {
12573                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12574                 error = EINVAL;
12575                 if (i_pak) {
12576                         SCTP_RELEASE_PKT(i_pak);
12577                 }
12578                 return (error);
12579         }
12580         if ((uio == NULL) && (i_pak == NULL)) {
12581                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12582                 return (EINVAL);
12583         }
12584         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12585         atomic_add_int(&inp->total_sends, 1);
12586         if (uio) {
12587                 if (uio->uio_resid < 0) {
12588                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12589                         return (EINVAL);
12590                 }
12591                 sndlen = (unsigned int)uio->uio_resid;
12592         } else {
12593                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12594                 sndlen = SCTP_HEADER_LEN(i_pak);
12595         }
12596         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12597             (void *)addr,
12598             sndlen);
12599         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12600             (inp->sctp_socket->so_qlimit)) {
12601                 /* The listener can NOT send */
12602                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12603                 error = ENOTCONN;
12604                 goto out_unlocked;
12605         }
12606         /**
12607          * Pre-screen address, if one is given the sin-len
12608          * must be set correctly!
12609          */
12610         if (addr) {
12611                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12612
12613                 switch (raddr->sa.sa_family) {
12614 #ifdef INET
12615                 case AF_INET:
12616                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12617                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12618                                 error = EINVAL;
12619                                 goto out_unlocked;
12620                         }
12621                         port = raddr->sin.sin_port;
12622                         break;
12623 #endif
12624 #ifdef INET6
12625                 case AF_INET6:
12626                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12627                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12628                                 error = EINVAL;
12629                                 goto out_unlocked;
12630                         }
12631                         port = raddr->sin6.sin6_port;
12632                         break;
12633 #endif
12634                 default:
12635                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12636                         error = EAFNOSUPPORT;
12637                         goto out_unlocked;
12638                 }
12639         } else
12640                 port = 0;
12641
12642         if (srcv) {
12643                 sinfo_flags = srcv->sinfo_flags;
12644                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12645                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12646                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12647                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12648                         error = EINVAL;
12649                         goto out_unlocked;
12650                 }
12651                 if (srcv->sinfo_flags)
12652                         SCTP_STAT_INCR(sctps_sends_with_flags);
12653         } else {
12654                 sinfo_flags = inp->def_send.sinfo_flags;
12655                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12656         }
12657         if (sinfo_flags & SCTP_SENDALL) {
12658                 /* its a sendall */
12659                 error = sctp_sendall(inp, uio, top, srcv);
12660                 top = NULL;
12661                 goto out_unlocked;
12662         }
12663         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12664                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12665                 error = EINVAL;
12666                 goto out_unlocked;
12667         }
12668         /* now we must find the assoc */
12669         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12670             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12671                 SCTP_INP_RLOCK(inp);
12672                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12673                 if (stcb) {
12674                         SCTP_TCB_LOCK(stcb);
12675                         hold_tcblock = 1;
12676                 }
12677                 SCTP_INP_RUNLOCK(inp);
12678         } else if (sinfo_assoc_id) {
12679                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12680         } else if (addr) {
12681                 /*-
12682                  * Since we did not use findep we must
12683                  * increment it, and if we don't find a tcb
12684                  * decrement it.
12685                  */
12686                 SCTP_INP_WLOCK(inp);
12687                 SCTP_INP_INCR_REF(inp);
12688                 SCTP_INP_WUNLOCK(inp);
12689                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12690                 if (stcb == NULL) {
12691                         SCTP_INP_WLOCK(inp);
12692                         SCTP_INP_DECR_REF(inp);
12693                         SCTP_INP_WUNLOCK(inp);
12694                 } else {
12695                         hold_tcblock = 1;
12696                 }
12697         }
12698         if ((stcb == NULL) && (addr)) {
12699                 /* Possible implicit send? */
12700                 SCTP_ASOC_CREATE_LOCK(inp);
12701                 create_lock_applied = 1;
12702                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12703                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12704                         /* Should I really unlock ? */
12705                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12706                         error = EINVAL;
12707                         goto out_unlocked;
12708
12709                 }
12710                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12711                     (addr->sa_family == AF_INET6)) {
12712                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12713                         error = EINVAL;
12714                         goto out_unlocked;
12715                 }
12716                 SCTP_INP_WLOCK(inp);
12717                 SCTP_INP_INCR_REF(inp);
12718                 SCTP_INP_WUNLOCK(inp);
12719                 /* With the lock applied look again */
12720                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12721                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12722                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12723                 }
12724                 if (stcb == NULL) {
12725                         SCTP_INP_WLOCK(inp);
12726                         SCTP_INP_DECR_REF(inp);
12727                         SCTP_INP_WUNLOCK(inp);
12728                 } else {
12729                         hold_tcblock = 1;
12730                 }
12731                 if (error) {
12732                         goto out_unlocked;
12733                 }
12734                 if (t_inp != inp) {
12735                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12736                         error = ENOTCONN;
12737                         goto out_unlocked;
12738                 }
12739         }
12740         if (stcb == NULL) {
12741                 if (addr == NULL) {
12742                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12743                         error = ENOENT;
12744                         goto out_unlocked;
12745                 } else {
12746                         /* We must go ahead and start the INIT process */
12747                         uint32_t vrf_id;
12748
12749                         if ((sinfo_flags & SCTP_ABORT) ||
12750                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12751                                 /*-
12752                                  * User asks to abort a non-existant assoc,
12753                                  * or EOF a non-existant assoc with no data
12754                                  */
12755                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12756                                 error = ENOENT;
12757                                 goto out_unlocked;
12758                         }
12759                         /* get an asoc/stcb struct */
12760                         vrf_id = inp->def_vrf_id;
12761 #ifdef INVARIANTS
12762                         if (create_lock_applied == 0) {
12763                                 panic("Error, should hold create lock and I don't?");
12764                         }
12765 #endif
12766                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12767                             inp->sctp_ep.pre_open_stream_count,
12768                             inp->sctp_ep.port,
12769                             p);
12770                         if (stcb == NULL) {
12771                                 /* Error is setup for us in the call */
12772                                 goto out_unlocked;
12773                         }
12774                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12775                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12776                                 /*
12777                                  * Set the connected flag so we can queue
12778                                  * data
12779                                  */
12780                                 soisconnecting(so);
12781                         }
12782                         hold_tcblock = 1;
12783                         if (create_lock_applied) {
12784                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12785                                 create_lock_applied = 0;
12786                         } else {
12787                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12788                         }
12789                         /*
12790                          * Turn on queue only flag to prevent data from
12791                          * being sent
12792                          */
12793                         queue_only = 1;
12794                         asoc = &stcb->asoc;
12795                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12796                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12797
12798                         /* initialize authentication params for the assoc */
12799                         sctp_initialize_auth_params(inp, stcb);
12800
12801                         if (control) {
12802                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12803                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12804                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12805                                         hold_tcblock = 0;
12806                                         stcb = NULL;
12807                                         goto out_unlocked;
12808                                 }
12809                         }
12810                         /* out with the INIT */
12811                         queue_only_for_init = 1;
12812                         /*-
12813                          * we may want to dig in after this call and adjust the MTU
12814                          * value. It defaulted to 1500 (constant) but the ro
12815                          * structure may now have an update and thus we may need to
12816                          * change it BEFORE we append the message.
12817                          */
12818                 }
12819         } else
12820                 asoc = &stcb->asoc;
12821         if (srcv == NULL)
12822                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12823         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12824                 if (addr)
12825                         net = sctp_findnet(stcb, addr);
12826                 else
12827                         net = NULL;
12828                 if ((net == NULL) ||
12829                     ((port != 0) && (port != stcb->rport))) {
12830                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12831                         error = EINVAL;
12832                         goto out_unlocked;
12833                 }
12834         } else {
12835                 if (stcb->asoc.alternate) {
12836                         net = stcb->asoc.alternate;
12837                 } else {
12838                         net = stcb->asoc.primary_destination;
12839                 }
12840         }
12841         atomic_add_int(&stcb->total_sends, 1);
12842         /* Keep the stcb from being freed under our feet */
12843         atomic_add_int(&asoc->refcnt, 1);
12844         free_cnt_applied = 1;
12845
12846         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12847                 if (sndlen > asoc->smallest_mtu) {
12848                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12849                         error = EMSGSIZE;
12850                         goto out_unlocked;
12851                 }
12852         }
12853         if (SCTP_SO_IS_NBIO(so)
12854             || (flags & MSG_NBIO)
12855             ) {
12856                 non_blocking = 1;
12857         }
12858         /* would we block? */
12859         if (non_blocking) {
12860                 if (hold_tcblock == 0) {
12861                         SCTP_TCB_LOCK(stcb);
12862                         hold_tcblock = 1;
12863                 }
12864                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12865                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + 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 += 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(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12911             (SCTP_GET_STATE(asoc) == 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(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12920             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12921             (SCTP_GET_STATE(asoc) == 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                 int tot_demand, tot_out = 0, max_out;
12939
12940                 SCTP_STAT_INCR(sctps_sends_with_abort);
12941                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12942                     (SCTP_GET_STATE(asoc) == 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(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) = 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 * sizeof(struct sctp_data_chunk));
13032         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13033                 if (non_blocking) {
13034                         /* we already checked for non-blocking above. */
13035                         max_len = sndlen;
13036                 } else {
13037                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13038                 }
13039         } else {
13040                 max_len = 0;
13041         }
13042         if (hold_tcblock) {
13043                 SCTP_TCB_UNLOCK(stcb);
13044                 hold_tcblock = 0;
13045         }
13046         if (asoc->strmout == NULL) {
13047                 /* huh? software error */
13048                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13049                 error = EFAULT;
13050                 goto out_unlocked;
13051         }
13052         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13053         if ((user_marks_eor == 0) &&
13054             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13055                 /* It will NEVER fit */
13056                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13057                 error = EMSGSIZE;
13058                 goto out_unlocked;
13059         }
13060         if ((uio == NULL) && user_marks_eor) {
13061                 /*-
13062                  * We do not support eeor mode for
13063                  * sending with mbuf chains (like sendfile).
13064                  */
13065                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13066                 error = EINVAL;
13067                 goto out_unlocked;
13068         }
13069         if (user_marks_eor) {
13070                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13071         } else {
13072                 /*-
13073                  * For non-eeor the whole message must fit in
13074                  * the socket send buffer.
13075                  */
13076                 local_add_more = sndlen;
13077         }
13078         len = 0;
13079         if (non_blocking) {
13080                 goto skip_preblock;
13081         }
13082         if (((max_len <= local_add_more) &&
13083             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13084             (max_len == 0) ||
13085             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13086                 /* No room right now ! */
13087                 SOCKBUF_LOCK(&so->so_snd);
13088                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13089                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13090                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13091                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13092                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13093                             inqueue_bytes,
13094                             local_add_more,
13095                             stcb->asoc.stream_queue_cnt,
13096                             stcb->asoc.chunks_on_out_queue,
13097                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13098                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13099                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13100                         }
13101                         be.error = 0;
13102                         stcb->block_entry = &be;
13103                         error = sbwait(&so->so_snd);
13104                         stcb->block_entry = NULL;
13105                         if (error || so->so_error || be.error) {
13106                                 if (error == 0) {
13107                                         if (so->so_error)
13108                                                 error = so->so_error;
13109                                         if (be.error) {
13110                                                 error = be.error;
13111                                         }
13112                                 }
13113                                 SOCKBUF_UNLOCK(&so->so_snd);
13114                                 goto out_unlocked;
13115                         }
13116                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13117                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13118                                     asoc, stcb->asoc.total_output_queue_size);
13119                         }
13120                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13121                                 goto out_unlocked;
13122                         }
13123                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13124                 }
13125                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13126                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13127                 } else {
13128                         max_len = 0;
13129                 }
13130                 SOCKBUF_UNLOCK(&so->so_snd);
13131         }
13132 skip_preblock:
13133         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13134                 goto out_unlocked;
13135         }
13136         /*
13137          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13138          * case NOTE: uio will be null when top/mbuf is passed
13139          */
13140         if (sndlen == 0) {
13141                 if (srcv->sinfo_flags & SCTP_EOF) {
13142                         got_all_of_the_send = 1;
13143                         goto dataless_eof;
13144                 } else {
13145                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13146                         error = EINVAL;
13147                         goto out;
13148                 }
13149         }
13150         if (top == NULL) {
13151                 struct sctp_stream_queue_pending *sp;
13152                 struct sctp_stream_out *strm;
13153                 uint32_t sndout;
13154
13155                 SCTP_TCB_SEND_LOCK(stcb);
13156                 if ((asoc->stream_locked) &&
13157                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13158                         SCTP_TCB_SEND_UNLOCK(stcb);
13159                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13160                         error = EINVAL;
13161                         goto out;
13162                 }
13163                 SCTP_TCB_SEND_UNLOCK(stcb);
13164
13165                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13166                 if (strm->last_msg_incomplete == 0) {
13167         do_a_copy_in:
13168                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13169                         if ((sp == NULL) || (error)) {
13170                                 goto out;
13171                         }
13172                         SCTP_TCB_SEND_LOCK(stcb);
13173                         if (sp->msg_is_complete) {
13174                                 strm->last_msg_incomplete = 0;
13175                                 asoc->stream_locked = 0;
13176                         } else {
13177                                 /*
13178                                  * Just got locked to this guy in case of an
13179                                  * interrupt.
13180                                  */
13181                                 strm->last_msg_incomplete = 1;
13182                                 if (stcb->asoc.idata_supported == 0) {
13183                                         asoc->stream_locked = 1;
13184                                         asoc->stream_locked_on = srcv->sinfo_stream;
13185                                 }
13186                                 sp->sender_all_done = 0;
13187                         }
13188                         sctp_snd_sb_alloc(stcb, sp->length);
13189                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13190                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13191                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13192                         }
13193                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13194                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13195                         SCTP_TCB_SEND_UNLOCK(stcb);
13196                 } else {
13197                         SCTP_TCB_SEND_LOCK(stcb);
13198                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13199                         SCTP_TCB_SEND_UNLOCK(stcb);
13200                         if (sp == NULL) {
13201                                 /* ???? Huh ??? last msg is gone */
13202 #ifdef INVARIANTS
13203                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13204 #else
13205                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13206                                 strm->last_msg_incomplete = 0;
13207 #endif
13208                                 goto do_a_copy_in;
13209
13210                         }
13211                 }
13212                 while (uio->uio_resid > 0) {
13213                         /* How much room do we have? */
13214                         struct mbuf *new_tail, *mm;
13215
13216                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13217                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13218                         else
13219                                 max_len = 0;
13220
13221                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13222                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13223                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13224                                 sndout = 0;
13225                                 new_tail = NULL;
13226                                 if (hold_tcblock) {
13227                                         SCTP_TCB_UNLOCK(stcb);
13228                                         hold_tcblock = 0;
13229                                 }
13230                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13231                                 if ((mm == NULL) || error) {
13232                                         if (mm) {
13233                                                 sctp_m_freem(mm);
13234                                         }
13235                                         goto out;
13236                                 }
13237                                 /* Update the mbuf and count */
13238                                 SCTP_TCB_SEND_LOCK(stcb);
13239                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13240                                         /*
13241                                          * we need to get out. Peer probably
13242                                          * aborted.
13243                                          */
13244                                         sctp_m_freem(mm);
13245                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13246                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13247                                                 error = ECONNRESET;
13248                                         }
13249                                         SCTP_TCB_SEND_UNLOCK(stcb);
13250                                         goto out;
13251                                 }
13252                                 if (sp->tail_mbuf) {
13253                                         /* tack it to the end */
13254                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13255                                         sp->tail_mbuf = new_tail;
13256                                 } else {
13257                                         /* A stolen mbuf */
13258                                         sp->data = mm;
13259                                         sp->tail_mbuf = new_tail;
13260                                 }
13261                                 sctp_snd_sb_alloc(stcb, sndout);
13262                                 atomic_add_int(&sp->length, sndout);
13263                                 len += sndout;
13264
13265                                 /* Did we reach EOR? */
13266                                 if ((uio->uio_resid == 0) &&
13267                                     ((user_marks_eor == 0) ||
13268                                     (srcv->sinfo_flags & SCTP_EOF) ||
13269                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13270                                         sp->msg_is_complete = 1;
13271                                 } else {
13272                                         sp->msg_is_complete = 0;
13273                                 }
13274                                 SCTP_TCB_SEND_UNLOCK(stcb);
13275                         }
13276                         if (uio->uio_resid == 0) {
13277                                 /* got it all? */
13278                                 continue;
13279                         }
13280                         /* PR-SCTP? */
13281                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13282                                 /*
13283                                  * This is ugly but we must assure locking
13284                                  * order
13285                                  */
13286                                 if (hold_tcblock == 0) {
13287                                         SCTP_TCB_LOCK(stcb);
13288                                         hold_tcblock = 1;
13289                                 }
13290                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13291                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13292                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13293                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13294                                 else
13295                                         max_len = 0;
13296                                 if (max_len > 0) {
13297                                         continue;
13298                                 }
13299                                 SCTP_TCB_UNLOCK(stcb);
13300                                 hold_tcblock = 0;
13301                         }
13302                         /* wait for space now */
13303                         if (non_blocking) {
13304                                 /* Non-blocking io in place out */
13305                                 goto skip_out_eof;
13306                         }
13307                         /* What about the INIT, send it maybe */
13308                         if (queue_only_for_init) {
13309                                 if (hold_tcblock == 0) {
13310                                         SCTP_TCB_LOCK(stcb);
13311                                         hold_tcblock = 1;
13312                                 }
13313                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13314                                         /* a collision took us forward? */
13315                                         queue_only = 0;
13316                                 } else {
13317                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13318                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13319                                         queue_only = 1;
13320                                 }
13321                         }
13322                         if ((net->flight_size > net->cwnd) &&
13323                             (asoc->sctp_cmt_on_off == 0)) {
13324                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13325                                 queue_only = 1;
13326                         } else if (asoc->ifp_had_enobuf) {
13327                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13328                                 if (net->flight_size > (2 * net->mtu)) {
13329                                         queue_only = 1;
13330                                 }
13331                                 asoc->ifp_had_enobuf = 0;
13332                         }
13333                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13334                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13335                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13336                             (stcb->asoc.total_flight > 0) &&
13337                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13338                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13339
13340                                 /*-
13341                                  * Ok, Nagle is set on and we have data outstanding.
13342                                  * Don't send anything and let SACKs drive out the
13343                                  * data unless we have a "full" segment to send.
13344                                  */
13345                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13346                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13347                                 }
13348                                 SCTP_STAT_INCR(sctps_naglequeued);
13349                                 nagle_applies = 1;
13350                         } else {
13351                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13352                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13353                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13354                                 }
13355                                 SCTP_STAT_INCR(sctps_naglesent);
13356                                 nagle_applies = 0;
13357                         }
13358                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13359
13360                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13361                                     nagle_applies, un_sent);
13362                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13363                                     stcb->asoc.total_flight,
13364                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13365                         }
13366                         if (queue_only_for_init)
13367                                 queue_only_for_init = 0;
13368                         if ((queue_only == 0) && (nagle_applies == 0)) {
13369                                 /*-
13370                                  * need to start chunk output
13371                                  * before blocking.. note that if
13372                                  * a lock is already applied, then
13373                                  * the input via the net is happening
13374                                  * and I don't need to start output :-D
13375                                  */
13376                                 if (hold_tcblock == 0) {
13377                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13378                                                 hold_tcblock = 1;
13379                                                 sctp_chunk_output(inp,
13380                                                     stcb,
13381                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13382                                         }
13383                                 } else {
13384                                         sctp_chunk_output(inp,
13385                                             stcb,
13386                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13387                                 }
13388                                 if (hold_tcblock == 1) {
13389                                         SCTP_TCB_UNLOCK(stcb);
13390                                         hold_tcblock = 0;
13391                                 }
13392                         }
13393                         SOCKBUF_LOCK(&so->so_snd);
13394                         /*-
13395                          * This is a bit strange, but I think it will
13396                          * work. The total_output_queue_size is locked and
13397                          * protected by the TCB_LOCK, which we just released.
13398                          * There is a race that can occur between releasing it
13399                          * above, and me getting the socket lock, where sacks
13400                          * come in but we have not put the SB_WAIT on the
13401                          * so_snd buffer to get the wakeup. After the LOCK
13402                          * is applied the sack_processing will also need to
13403                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13404                          * once we have the socket buffer lock if we recheck the
13405                          * size we KNOW we will get to sleep safely with the
13406                          * wakeup flag in place.
13407                          */
13408                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13409                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13410                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13411                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13412                                             asoc, (size_t)uio->uio_resid);
13413                                 }
13414                                 be.error = 0;
13415                                 stcb->block_entry = &be;
13416                                 error = sbwait(&so->so_snd);
13417                                 stcb->block_entry = NULL;
13418
13419                                 if (error || so->so_error || be.error) {
13420                                         if (error == 0) {
13421                                                 if (so->so_error)
13422                                                         error = so->so_error;
13423                                                 if (be.error) {
13424                                                         error = be.error;
13425                                                 }
13426                                         }
13427                                         SOCKBUF_UNLOCK(&so->so_snd);
13428                                         goto out_unlocked;
13429                                 }
13430                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13431                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13432                                             asoc, stcb->asoc.total_output_queue_size);
13433                                 }
13434                         }
13435                         SOCKBUF_UNLOCK(&so->so_snd);
13436                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13437                                 goto out_unlocked;
13438                         }
13439                 }
13440                 SCTP_TCB_SEND_LOCK(stcb);
13441                 if (sp) {
13442                         if (sp->msg_is_complete == 0) {
13443                                 strm->last_msg_incomplete = 1;
13444                                 if (stcb->asoc.idata_supported == 0) {
13445                                         asoc->stream_locked = 1;
13446                                         asoc->stream_locked_on = srcv->sinfo_stream;
13447                                 }
13448                         } else {
13449                                 sp->sender_all_done = 1;
13450                                 strm->last_msg_incomplete = 0;
13451                                 asoc->stream_locked = 0;
13452                         }
13453                 } else {
13454                         SCTP_PRINTF("Huh no sp TSNH?\n");
13455                         strm->last_msg_incomplete = 0;
13456                         asoc->stream_locked = 0;
13457                 }
13458                 SCTP_TCB_SEND_UNLOCK(stcb);
13459                 if (uio->uio_resid == 0) {
13460                         got_all_of_the_send = 1;
13461                 }
13462         } else {
13463                 /* We send in a 0, since we do NOT have any locks */
13464                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13465                 top = NULL;
13466                 if (srcv->sinfo_flags & SCTP_EOF) {
13467                         /*
13468                          * This should only happen for Panda for the mbuf
13469                          * send case, which does NOT yet support EEOR mode.
13470                          * Thus, we can just set this flag to do the proper
13471                          * EOF handling.
13472                          */
13473                         got_all_of_the_send = 1;
13474                 }
13475         }
13476         if (error) {
13477                 goto out;
13478         }
13479 dataless_eof:
13480         /* EOF thing ? */
13481         if ((srcv->sinfo_flags & SCTP_EOF) &&
13482             (got_all_of_the_send == 1)) {
13483                 int cnt;
13484
13485                 SCTP_STAT_INCR(sctps_sends_with_eof);
13486                 error = 0;
13487                 if (hold_tcblock == 0) {
13488                         SCTP_TCB_LOCK(stcb);
13489                         hold_tcblock = 1;
13490                 }
13491                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13492                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13493                     TAILQ_EMPTY(&asoc->sent_queue) &&
13494                     (cnt == 0)) {
13495                         if (asoc->locked_on_sending) {
13496                                 goto abort_anyway;
13497                         }
13498                         /* there is nothing queued to send, so I'm done... */
13499                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13500                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13501                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13502                                 struct sctp_nets *netp;
13503
13504                                 /* only send SHUTDOWN the first time through */
13505                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13506                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13507                                 }
13508                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13509                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13510                                 sctp_stop_timers_for_shutdown(stcb);
13511                                 if (stcb->asoc.alternate) {
13512                                         netp = stcb->asoc.alternate;
13513                                 } else {
13514                                         netp = stcb->asoc.primary_destination;
13515                                 }
13516                                 sctp_send_shutdown(stcb, netp);
13517                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13518                                     netp);
13519                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13520                                     asoc->primary_destination);
13521                         }
13522                 } else {
13523                         /*-
13524                          * we still got (or just got) data to send, so set
13525                          * SHUTDOWN_PENDING
13526                          */
13527                         /*-
13528                          * XXX sockets draft says that SCTP_EOF should be
13529                          * sent with no data.  currently, we will allow user
13530                          * data to be sent first and move to
13531                          * SHUTDOWN-PENDING
13532                          */
13533                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13534                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13535                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13536                                 if (hold_tcblock == 0) {
13537                                         SCTP_TCB_LOCK(stcb);
13538                                         hold_tcblock = 1;
13539                                 }
13540                                 if (asoc->locked_on_sending) {
13541                                         /* Locked to send out the data */
13542                                         struct sctp_stream_queue_pending *sp;
13543
13544                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13545                                         if (sp) {
13546                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13547                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13548                                         }
13549                                 }
13550                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13551                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13552                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13553                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13554                                         struct mbuf *op_err;
13555                                         char msg[SCTP_DIAG_INFO_LEN];
13556
13557                         abort_anyway:
13558                                         if (free_cnt_applied) {
13559                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13560                                                 free_cnt_applied = 0;
13561                                         }
13562                                         snprintf(msg, sizeof(msg),
13563                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13564                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13565                                             msg);
13566                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13567                                             op_err, SCTP_SO_LOCKED);
13568                                         /*
13569                                          * now relock the stcb so everything
13570                                          * is sane
13571                                          */
13572                                         hold_tcblock = 0;
13573                                         stcb = NULL;
13574                                         goto out;
13575                                 }
13576                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13577                                     asoc->primary_destination);
13578                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13579                         }
13580                 }
13581         }
13582 skip_out_eof:
13583         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13584                 some_on_control = 1;
13585         }
13586         if (queue_only_for_init) {
13587                 if (hold_tcblock == 0) {
13588                         SCTP_TCB_LOCK(stcb);
13589                         hold_tcblock = 1;
13590                 }
13591                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13592                         /* a collision took us forward? */
13593                         queue_only = 0;
13594                 } else {
13595                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13596                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13597                         queue_only = 1;
13598                 }
13599         }
13600         if ((net->flight_size > net->cwnd) &&
13601             (stcb->asoc.sctp_cmt_on_off == 0)) {
13602                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13603                 queue_only = 1;
13604         } else if (asoc->ifp_had_enobuf) {
13605                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13606                 if (net->flight_size > (2 * net->mtu)) {
13607                         queue_only = 1;
13608                 }
13609                 asoc->ifp_had_enobuf = 0;
13610         }
13611         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13612             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13613         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13614             (stcb->asoc.total_flight > 0) &&
13615             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13616             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13617                 /*-
13618                  * Ok, Nagle is set on and we have data outstanding.
13619                  * Don't send anything and let SACKs drive out the
13620                  * data unless wen have a "full" segment to send.
13621                  */
13622                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13623                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13624                 }
13625                 SCTP_STAT_INCR(sctps_naglequeued);
13626                 nagle_applies = 1;
13627         } else {
13628                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13629                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13630                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13631                 }
13632                 SCTP_STAT_INCR(sctps_naglesent);
13633                 nagle_applies = 0;
13634         }
13635         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13636                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13637                     nagle_applies, un_sent);
13638                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13639                     stcb->asoc.total_flight,
13640                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13641         }
13642         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13643                 /* we can attempt to send too. */
13644                 if (hold_tcblock == 0) {
13645                         /*
13646                          * If there is activity recv'ing sacks no need to
13647                          * send
13648                          */
13649                         if (SCTP_TCB_TRYLOCK(stcb)) {
13650                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13651                                 hold_tcblock = 1;
13652                         }
13653                 } else {
13654                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13655                 }
13656         } else if ((queue_only == 0) &&
13657                     (stcb->asoc.peers_rwnd == 0) &&
13658             (stcb->asoc.total_flight == 0)) {
13659                 /* We get to have a probe outstanding */
13660                 if (hold_tcblock == 0) {
13661                         hold_tcblock = 1;
13662                         SCTP_TCB_LOCK(stcb);
13663                 }
13664                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13665         } else if (some_on_control) {
13666                 int num_out, reason, frag_point;
13667
13668                 /* Here we do control only */
13669                 if (hold_tcblock == 0) {
13670                         hold_tcblock = 1;
13671                         SCTP_TCB_LOCK(stcb);
13672                 }
13673                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13674                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13675                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13676         }
13677         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13678             queue_only, stcb->asoc.peers_rwnd, un_sent,
13679             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13680             stcb->asoc.total_output_queue_size, error);
13681
13682 out:
13683 out_unlocked:
13684
13685         if (local_soresv && stcb) {
13686                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13687         }
13688         if (create_lock_applied) {
13689                 SCTP_ASOC_CREATE_UNLOCK(inp);
13690         }
13691         if ((stcb) && hold_tcblock) {
13692                 SCTP_TCB_UNLOCK(stcb);
13693         }
13694         if (stcb && free_cnt_applied) {
13695                 atomic_add_int(&stcb->asoc.refcnt, -1);
13696         }
13697 #ifdef INVARIANTS
13698         if (stcb) {
13699                 if (mtx_owned(&stcb->tcb_mtx)) {
13700                         panic("Leaving with tcb mtx owned?");
13701                 }
13702                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13703                         panic("Leaving with tcb send mtx owned?");
13704                 }
13705         }
13706 #endif
13707         if (top) {
13708                 sctp_m_freem(top);
13709         }
13710         if (control) {
13711                 sctp_m_freem(control);
13712         }
13713         return (error);
13714 }
13715
13716
13717 /*
13718  * generate an AUTHentication chunk, if required
13719  */
13720 struct mbuf *
13721 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13722     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13723     struct sctp_tcb *stcb, uint8_t chunk)
13724 {
13725         struct mbuf *m_auth;
13726         struct sctp_auth_chunk *auth;
13727         int chunk_len;
13728         struct mbuf *cn;
13729
13730         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13731             (stcb == NULL))
13732                 return (m);
13733
13734         if (stcb->asoc.auth_supported == 0) {
13735                 return (m);
13736         }
13737         /* does the requested chunk require auth? */
13738         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13739                 return (m);
13740         }
13741         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13742         if (m_auth == NULL) {
13743                 /* no mbuf's */
13744                 return (m);
13745         }
13746         /* reserve some space if this will be the first mbuf */
13747         if (m == NULL)
13748                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13749         /* fill in the AUTH chunk details */
13750         auth = mtod(m_auth, struct sctp_auth_chunk *);
13751         bzero(auth, sizeof(*auth));
13752         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13753         auth->ch.chunk_flags = 0;
13754         chunk_len = sizeof(*auth) +
13755             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13756         auth->ch.chunk_length = htons(chunk_len);
13757         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13758         /* key id and hmac digest will be computed and filled in upon send */
13759
13760         /* save the offset where the auth was inserted into the chain */
13761         *offset = 0;
13762         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13763                 *offset += SCTP_BUF_LEN(cn);
13764         }
13765
13766         /* update length and return pointer to the auth chunk */
13767         SCTP_BUF_LEN(m_auth) = chunk_len;
13768         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13769         if (auth_ret != NULL)
13770                 *auth_ret = auth;
13771
13772         return (m);
13773 }
13774
13775 #ifdef INET6
13776 int
13777 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13778 {
13779         struct nd_prefix *pfx = NULL;
13780         struct nd_pfxrouter *pfxrtr = NULL;
13781         struct sockaddr_in6 gw6;
13782
13783         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13784                 return (0);
13785
13786         /* get prefix entry of address */
13787         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13788                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13789                         continue;
13790                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13791                     &src6->sin6_addr, &pfx->ndpr_mask))
13792                         break;
13793         }
13794         /* no prefix entry in the prefix list */
13795         if (pfx == NULL) {
13796                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13797                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13798                 return (0);
13799         }
13800         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13801         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13802
13803         /* search installed gateway from prefix entry */
13804         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13805                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13806                 gw6.sin6_family = AF_INET6;
13807                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13808                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13809                     sizeof(struct in6_addr));
13810                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13811                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13812                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13813                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13814                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13815                     ro->ro_rt->rt_gateway)) {
13816                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13817                         return (1);
13818                 }
13819         }
13820         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13821         return (0);
13822 }
13823
13824 #endif
13825
13826 int
13827 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13828 {
13829 #ifdef INET
13830         struct sockaddr_in *sin, *mask;
13831         struct ifaddr *ifa;
13832         struct in_addr srcnetaddr, gwnetaddr;
13833
13834         if (ro == NULL || ro->ro_rt == NULL ||
13835             sifa->address.sa.sa_family != AF_INET) {
13836                 return (0);
13837         }
13838         ifa = (struct ifaddr *)sifa->ifa;
13839         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13840         sin = &sifa->address.sin;
13841         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13842         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13843         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13844         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13845
13846         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13847         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13848         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13849         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13850         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13851         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13852                 return (1);
13853         }
13854 #endif
13855         return (0);
13856 }