sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *parmh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946
1947 #endif
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963 #if defined(INET) || defined(INET6)
1964         if (M_TRAILINGSPACE(m) >= plen) {
1965                 /* easy side we just drop it on the end */
1966                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967                 mret = m;
1968         } else {
1969                 /* Need more space */
1970                 mret = m;
1971                 while (SCTP_BUF_NEXT(mret) != NULL) {
1972                         mret = SCTP_BUF_NEXT(mret);
1973                 }
1974                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1975                 if (SCTP_BUF_NEXT(mret) == NULL) {
1976                         /* We are hosed, can't add more addresses */
1977                         return (m);
1978                 }
1979                 mret = SCTP_BUF_NEXT(mret);
1980                 parmh = mtod(mret, struct sctp_paramhdr *);
1981         }
1982         /* now add the parameter */
1983         switch (ifa->address.sa.sa_family) {
1984 #ifdef INET
1985         case AF_INET:
1986                 {
1987                         struct sctp_ipv4addr_param *ipv4p;
1988                         struct sockaddr_in *sin;
1989
1990                         sin = &ifa->address.sin;
1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993                         parmh->param_length = htons(plen);
1994                         ipv4p->addr = sin->sin_addr.s_addr;
1995                         SCTP_BUF_LEN(mret) += plen;
1996                         break;
1997                 }
1998 #endif
1999 #ifdef INET6
2000         case AF_INET6:
2001                 {
2002                         struct sctp_ipv6addr_param *ipv6p;
2003                         struct sockaddr_in6 *sin6;
2004
2005                         sin6 = &ifa->address.sin6;
2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008                         parmh->param_length = htons(plen);
2009                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2010                             sizeof(ipv6p->addr));
2011                         /* clear embedded scope in the address */
2012                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2013                         SCTP_BUF_LEN(mret) += plen;
2014                         break;
2015                 }
2016 #endif
2017         default:
2018                 return (m);
2019         }
2020         if (len != NULL) {
2021                 *len += plen;
2022         }
2023         return (mret);
2024 #endif
2025 }
2026
2027
2028 struct mbuf *
2029 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2030     struct sctp_scoping *scope,
2031     struct mbuf *m_at, int cnt_inits_to,
2032     uint16_t * padding_len, uint16_t * chunk_len)
2033 {
2034         struct sctp_vrf *vrf = NULL;
2035         int cnt, limit_out = 0, total_count;
2036         uint32_t vrf_id;
2037
2038         vrf_id = inp->def_vrf_id;
2039         SCTP_IPI_ADDR_RLOCK();
2040         vrf = sctp_find_vrf(vrf_id);
2041         if (vrf == NULL) {
2042                 SCTP_IPI_ADDR_RUNLOCK();
2043                 return (m_at);
2044         }
2045         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2046                 struct sctp_ifa *sctp_ifap;
2047                 struct sctp_ifn *sctp_ifnp;
2048
2049                 cnt = cnt_inits_to;
2050                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2051                         limit_out = 1;
2052                         cnt = SCTP_ADDRESS_LIMIT;
2053                         goto skip_count;
2054                 }
2055                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2056                         if ((scope->loopback_scope == 0) &&
2057                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2058                                 /*
2059                                  * Skip loopback devices if loopback_scope
2060                                  * not set
2061                                  */
2062                                 continue;
2063                         }
2064                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2065 #ifdef INET
2066                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2067                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2068                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2069                                         continue;
2070                                 }
2071 #endif
2072 #ifdef INET6
2073                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2074                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2075                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2076                                         continue;
2077                                 }
2078 #endif
2079                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2080                                         continue;
2081                                 }
2082                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2083                                         continue;
2084                                 }
2085                                 cnt++;
2086                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2087                                         break;
2088                                 }
2089                         }
2090                         if (cnt > SCTP_ADDRESS_LIMIT) {
2091                                 break;
2092                         }
2093                 }
2094 skip_count:
2095                 if (cnt > 1) {
2096                         total_count = 0;
2097                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2098                                 cnt = 0;
2099                                 if ((scope->loopback_scope == 0) &&
2100                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2101                                         /*
2102                                          * Skip loopback devices if
2103                                          * loopback_scope not set
2104                                          */
2105                                         continue;
2106                                 }
2107                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2108 #ifdef INET
2109                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2110                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2111                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2112                                                 continue;
2113                                         }
2114 #endif
2115 #ifdef INET6
2116                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2117                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2118                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2119                                                 continue;
2120                                         }
2121 #endif
2122                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2123                                                 continue;
2124                                         }
2125                                         if (sctp_is_address_in_scope(sctp_ifap,
2126                                             scope, 0) == 0) {
2127                                                 continue;
2128                                         }
2129                                         if ((chunk_len != NULL) &&
2130                                             (padding_len != NULL) &&
2131                                             (*padding_len > 0)) {
2132                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2133                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2134                                                 *chunk_len += *padding_len;
2135                                                 *padding_len = 0;
2136                                         }
2137                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2138                                         if (limit_out) {
2139                                                 cnt++;
2140                                                 total_count++;
2141                                                 if (cnt >= 2) {
2142                                                         /*
2143                                                          * two from each
2144                                                          * address
2145                                                          */
2146                                                         break;
2147                                                 }
2148                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2149                                                         /* No more addresses */
2150                                                         break;
2151                                                 }
2152                                         }
2153                                 }
2154                         }
2155                 }
2156         } else {
2157                 struct sctp_laddr *laddr;
2158
2159                 cnt = cnt_inits_to;
2160                 /* First, how many ? */
2161                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162                         if (laddr->ifa == NULL) {
2163                                 continue;
2164                         }
2165                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2166                                 /*
2167                                  * Address being deleted by the system, dont
2168                                  * list.
2169                                  */
2170                                 continue;
2171                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2172                                 /*
2173                                  * Address being deleted on this ep don't
2174                                  * list.
2175                                  */
2176                                 continue;
2177                         }
2178                         if (sctp_is_address_in_scope(laddr->ifa,
2179                             scope, 1) == 0) {
2180                                 continue;
2181                         }
2182                         cnt++;
2183                 }
2184                 /*
2185                  * To get through a NAT we only list addresses if we have
2186                  * more than one. That way if you just bind a single address
2187                  * we let the source of the init dictate our address.
2188                  */
2189                 if (cnt > 1) {
2190                         cnt = cnt_inits_to;
2191                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2192                                 if (laddr->ifa == NULL) {
2193                                         continue;
2194                                 }
2195                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2196                                         continue;
2197                                 }
2198                                 if (sctp_is_address_in_scope(laddr->ifa,
2199                                     scope, 0) == 0) {
2200                                         continue;
2201                                 }
2202                                 if ((chunk_len != NULL) &&
2203                                     (padding_len != NULL) &&
2204                                     (*padding_len > 0)) {
2205                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2206                                         SCTP_BUF_LEN(m_at) += *padding_len;
2207                                         *chunk_len += *padding_len;
2208                                         *padding_len = 0;
2209                                 }
2210                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2211                                 cnt++;
2212                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2213                                         break;
2214                                 }
2215                         }
2216                 }
2217         }
2218         SCTP_IPI_ADDR_RUNLOCK();
2219         return (m_at);
2220 }
2221
2222 static struct sctp_ifa *
2223 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2224     uint8_t dest_is_loop,
2225     uint8_t dest_is_priv,
2226     sa_family_t fam)
2227 {
2228         uint8_t dest_is_global = 0;
2229
2230         /* dest_is_priv is true if destination is a private address */
2231         /* dest_is_loop is true if destination is a loopback addresses */
2232
2233         /**
2234          * Here we determine if its a preferred address. A preferred address
2235          * means it is the same scope or higher scope then the destination.
2236          * L = loopback, P = private, G = global
2237          * -----------------------------------------
2238          *    src    |  dest | result
2239          *  ----------------------------------------
2240          *     L     |    L  |    yes
2241          *  -----------------------------------------
2242          *     P     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     G     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     L     |    P  |    no
2247          *  -----------------------------------------
2248          *     P     |    P  |    yes
2249          *  -----------------------------------------
2250          *     G     |    P  |    no
2251          *   -----------------------------------------
2252          *     L     |    G  |    no
2253          *   -----------------------------------------
2254          *     P     |    G  |    no
2255          *    -----------------------------------------
2256          *     G     |    G  |    yes
2257          *    -----------------------------------------
2258          */
2259
2260         if (ifa->address.sa.sa_family != fam) {
2261                 /* forget mis-matched family */
2262                 return (NULL);
2263         }
2264         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2265                 dest_is_global = 1;
2266         }
2267         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2268         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2269         /* Ok the address may be ok */
2270 #ifdef INET6
2271         if (fam == AF_INET6) {
2272                 /* ok to use deprecated addresses? no lets not! */
2273                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2274                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2275                         return (NULL);
2276                 }
2277                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2278                         if (dest_is_loop) {
2279                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2280                                 return (NULL);
2281                         }
2282                 }
2283                 if (ifa->src_is_glob) {
2284                         if (dest_is_loop) {
2285                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2286                                 return (NULL);
2287                         }
2288                 }
2289         }
2290 #endif
2291         /*
2292          * Now that we know what is what, implement or table this could in
2293          * theory be done slicker (it used to be), but this is
2294          * straightforward and easier to validate :-)
2295          */
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2297             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2299             dest_is_loop, dest_is_priv, dest_is_global);
2300
2301         if ((ifa->src_is_loop) && (dest_is_priv)) {
2302                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2303                 return (NULL);
2304         }
2305         if ((ifa->src_is_glob) && (dest_is_priv)) {
2306                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2307                 return (NULL);
2308         }
2309         if ((ifa->src_is_loop) && (dest_is_global)) {
2310                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2311                 return (NULL);
2312         }
2313         if ((ifa->src_is_priv) && (dest_is_global)) {
2314                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2315                 return (NULL);
2316         }
2317         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2318         /* its a preferred address */
2319         return (ifa);
2320 }
2321
2322 static struct sctp_ifa *
2323 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2324     uint8_t dest_is_loop,
2325     uint8_t dest_is_priv,
2326     sa_family_t fam)
2327 {
2328         uint8_t dest_is_global = 0;
2329
2330         /**
2331          * Here we determine if its a acceptable address. A acceptable
2332          * address means it is the same scope or higher scope but we can
2333          * allow for NAT which means its ok to have a global dest and a
2334          * private src.
2335          *
2336          * L = loopback, P = private, G = global
2337          * -----------------------------------------
2338          *  src    |  dest | result
2339          * -----------------------------------------
2340          *   L     |   L   |    yes
2341          *  -----------------------------------------
2342          *   P     |   L   |    yes-v4 no-v6
2343          *  -----------------------------------------
2344          *   G     |   L   |    yes
2345          * -----------------------------------------
2346          *   L     |   P   |    no
2347          * -----------------------------------------
2348          *   P     |   P   |    yes
2349          * -----------------------------------------
2350          *   G     |   P   |    yes - May not work
2351          * -----------------------------------------
2352          *   L     |   G   |    no
2353          * -----------------------------------------
2354          *   P     |   G   |    yes - May not work
2355          * -----------------------------------------
2356          *   G     |   G   |    yes
2357          * -----------------------------------------
2358          */
2359
2360         if (ifa->address.sa.sa_family != fam) {
2361                 /* forget non matching family */
2362                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2363                     ifa->address.sa.sa_family, fam);
2364                 return (NULL);
2365         }
2366         /* Ok the address may be ok */
2367         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2369             dest_is_loop, dest_is_priv);
2370         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2371                 dest_is_global = 1;
2372         }
2373 #ifdef INET6
2374         if (fam == AF_INET6) {
2375                 /* ok to use deprecated addresses? */
2376                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2377                         return (NULL);
2378                 }
2379                 if (ifa->src_is_priv) {
2380                         /* Special case, linklocal to loop */
2381                         if (dest_is_loop)
2382                                 return (NULL);
2383                 }
2384         }
2385 #endif
2386         /*
2387          * Now that we know what is what, implement our table. This could in
2388          * theory be done slicker (it used to be), but this is
2389          * straightforward and easier to validate :-)
2390          */
2391         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2392             ifa->src_is_loop,
2393             dest_is_priv);
2394         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2395                 return (NULL);
2396         }
2397         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2398             ifa->src_is_loop,
2399             dest_is_global);
2400         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2401                 return (NULL);
2402         }
2403         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2404         /* its an acceptable address */
2405         return (ifa);
2406 }
2407
2408 int
2409 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2410 {
2411         struct sctp_laddr *laddr;
2412
2413         if (stcb == NULL) {
2414                 /* There are no restrictions, no TCB :-) */
2415                 return (0);
2416         }
2417         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2418                 if (laddr->ifa == NULL) {
2419                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2420                             __FUNCTION__);
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                             __FUNCTION__);
2443                         continue;
2444                 }
2445                 if ((laddr->ifa == ifa) && laddr->action == 0)
2446                         /* same pointer */
2447                         return (1);
2448         }
2449         return (0);
2450 }
2451
2452
2453
2454 static struct sctp_ifa *
2455 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2456     sctp_route_t * ro,
2457     uint32_t vrf_id,
2458     int non_asoc_addr_ok,
2459     uint8_t dest_is_priv,
2460     uint8_t dest_is_loop,
2461     sa_family_t fam)
2462 {
2463         struct sctp_laddr *laddr, *starting_point;
2464         void *ifn;
2465         int resettotop = 0;
2466         struct sctp_ifn *sctp_ifn;
2467         struct sctp_ifa *sctp_ifa, *sifa;
2468         struct sctp_vrf *vrf;
2469         uint32_t ifn_index;
2470
2471         vrf = sctp_find_vrf(vrf_id);
2472         if (vrf == NULL)
2473                 return (NULL);
2474
2475         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2476         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2477         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2478         /*
2479          * first question, is the ifn we will emit on in our list, if so, we
2480          * want such an address. Note that we first looked for a preferred
2481          * address.
2482          */
2483         if (sctp_ifn) {
2484                 /* is a preferred one on the interface we route out? */
2485                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2486 #ifdef INET
2487                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2488                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2489                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2490                                 continue;
2491                         }
2492 #endif
2493 #ifdef INET6
2494                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2495                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2496                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2497                                 continue;
2498                         }
2499 #endif
2500                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2501                             (non_asoc_addr_ok == 0))
2502                                 continue;
2503                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2504                             dest_is_loop,
2505                             dest_is_priv, fam);
2506                         if (sifa == NULL)
2507                                 continue;
2508                         if (sctp_is_addr_in_ep(inp, sifa)) {
2509                                 atomic_add_int(&sifa->refcount, 1);
2510                                 return (sifa);
2511                         }
2512                 }
2513         }
2514         /*
2515          * ok, now we now need to find one on the list of the addresses. We
2516          * can't get one on the emitting interface so let's find first a
2517          * preferred one. If not that an acceptable one otherwise... we
2518          * return NULL.
2519          */
2520         starting_point = inp->next_addr_touse;
2521 once_again:
2522         if (inp->next_addr_touse == NULL) {
2523                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2524                 resettotop = 1;
2525         }
2526         for (laddr = inp->next_addr_touse; laddr;
2527             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2528                 if (laddr->ifa == NULL) {
2529                         /* address has been removed */
2530                         continue;
2531                 }
2532                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2533                         /* address is being deleted */
2534                         continue;
2535                 }
2536                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2537                     dest_is_priv, fam);
2538                 if (sifa == NULL)
2539                         continue;
2540                 atomic_add_int(&sifa->refcount, 1);
2541                 return (sifa);
2542         }
2543         if (resettotop == 0) {
2544                 inp->next_addr_touse = NULL;
2545                 goto once_again;
2546         }
2547         inp->next_addr_touse = starting_point;
2548         resettotop = 0;
2549 once_again_too:
2550         if (inp->next_addr_touse == NULL) {
2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552                 resettotop = 1;
2553         }
2554         /* ok, what about an acceptable address in the inp */
2555         for (laddr = inp->next_addr_touse; laddr;
2556             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2557                 if (laddr->ifa == NULL) {
2558                         /* address has been removed */
2559                         continue;
2560                 }
2561                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2562                         /* address is being deleted */
2563                         continue;
2564                 }
2565                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2566                     dest_is_priv, fam);
2567                 if (sifa == NULL)
2568                         continue;
2569                 atomic_add_int(&sifa->refcount, 1);
2570                 return (sifa);
2571         }
2572         if (resettotop == 0) {
2573                 inp->next_addr_touse = NULL;
2574                 goto once_again_too;
2575         }
2576         /*
2577          * no address bound can be a source for the destination we are in
2578          * trouble
2579          */
2580         return (NULL);
2581 }
2582
2583
2584
2585 static struct sctp_ifa *
2586 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2587     struct sctp_tcb *stcb,
2588     sctp_route_t * ro,
2589     uint32_t vrf_id,
2590     uint8_t dest_is_priv,
2591     uint8_t dest_is_loop,
2592     int non_asoc_addr_ok,
2593     sa_family_t fam)
2594 {
2595         struct sctp_laddr *laddr, *starting_point;
2596         void *ifn;
2597         struct sctp_ifn *sctp_ifn;
2598         struct sctp_ifa *sctp_ifa, *sifa;
2599         uint8_t start_at_beginning = 0;
2600         struct sctp_vrf *vrf;
2601         uint32_t ifn_index;
2602
2603         /*
2604          * first question, is the ifn we will emit on in our list, if so, we
2605          * want that one.
2606          */
2607         vrf = sctp_find_vrf(vrf_id);
2608         if (vrf == NULL)
2609                 return (NULL);
2610
2611         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2612         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2613         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2614
2615         /*
2616          * first question, is the ifn we will emit on in our list?  If so,
2617          * we want that one. First we look for a preferred. Second, we go
2618          * for an acceptable.
2619          */
2620         if (sctp_ifn) {
2621                 /* first try for a preferred address on the ep */
2622                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2623 #ifdef INET
2624                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2625                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2626                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2627                                 continue;
2628                         }
2629 #endif
2630 #ifdef INET6
2631                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2632                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2633                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2634                                 continue;
2635                         }
2636 #endif
2637                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2638                                 continue;
2639                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2640                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2641                                 if (sifa == NULL)
2642                                         continue;
2643                                 if (((non_asoc_addr_ok == 0) &&
2644                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2645                                     (non_asoc_addr_ok &&
2646                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2647                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2648                                         /* on the no-no list */
2649                                         continue;
2650                                 }
2651                                 atomic_add_int(&sifa->refcount, 1);
2652                                 return (sifa);
2653                         }
2654                 }
2655                 /* next try for an acceptable address on the ep */
2656                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2657 #ifdef INET
2658                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2659                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2660                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2661                                 continue;
2662                         }
2663 #endif
2664 #ifdef INET6
2665                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2666                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2667                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2668                                 continue;
2669                         }
2670 #endif
2671                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2672                                 continue;
2673                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2674                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2675                                 if (sifa == NULL)
2676                                         continue;
2677                                 if (((non_asoc_addr_ok == 0) &&
2678                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                                     (non_asoc_addr_ok &&
2680                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                                         /* on the no-no list */
2683                                         continue;
2684                                 }
2685                                 atomic_add_int(&sifa->refcount, 1);
2686                                 return (sifa);
2687                         }
2688                 }
2689
2690         }
2691         /*
2692          * if we can't find one like that then we must look at all addresses
2693          * bound to pick one at first preferable then secondly acceptable.
2694          */
2695         starting_point = stcb->asoc.last_used_address;
2696 sctp_from_the_top:
2697         if (stcb->asoc.last_used_address == NULL) {
2698                 start_at_beginning = 1;
2699                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2700         }
2701         /* search beginning with the last used address */
2702         for (laddr = stcb->asoc.last_used_address; laddr;
2703             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2704                 if (laddr->ifa == NULL) {
2705                         /* address has been removed */
2706                         continue;
2707                 }
2708                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2709                         /* address is being deleted */
2710                         continue;
2711                 }
2712                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2713                 if (sifa == NULL)
2714                         continue;
2715                 if (((non_asoc_addr_ok == 0) &&
2716                     (sctp_is_addr_restricted(stcb, sifa))) ||
2717                     (non_asoc_addr_ok &&
2718                     (sctp_is_addr_restricted(stcb, sifa)) &&
2719                     (!sctp_is_addr_pending(stcb, sifa)))) {
2720                         /* on the no-no list */
2721                         continue;
2722                 }
2723                 stcb->asoc.last_used_address = laddr;
2724                 atomic_add_int(&sifa->refcount, 1);
2725                 return (sifa);
2726         }
2727         if (start_at_beginning == 0) {
2728                 stcb->asoc.last_used_address = NULL;
2729                 goto sctp_from_the_top;
2730         }
2731         /* now try for any higher scope than the destination */
2732         stcb->asoc.last_used_address = starting_point;
2733         start_at_beginning = 0;
2734 sctp_from_the_top2:
2735         if (stcb->asoc.last_used_address == NULL) {
2736                 start_at_beginning = 1;
2737                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2738         }
2739         /* search beginning with the last used address */
2740         for (laddr = stcb->asoc.last_used_address; laddr;
2741             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2742                 if (laddr->ifa == NULL) {
2743                         /* address has been removed */
2744                         continue;
2745                 }
2746                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2747                         /* address is being deleted */
2748                         continue;
2749                 }
2750                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2751                     dest_is_priv, fam);
2752                 if (sifa == NULL)
2753                         continue;
2754                 if (((non_asoc_addr_ok == 0) &&
2755                     (sctp_is_addr_restricted(stcb, sifa))) ||
2756                     (non_asoc_addr_ok &&
2757                     (sctp_is_addr_restricted(stcb, sifa)) &&
2758                     (!sctp_is_addr_pending(stcb, sifa)))) {
2759                         /* on the no-no list */
2760                         continue;
2761                 }
2762                 stcb->asoc.last_used_address = laddr;
2763                 atomic_add_int(&sifa->refcount, 1);
2764                 return (sifa);
2765         }
2766         if (start_at_beginning == 0) {
2767                 stcb->asoc.last_used_address = NULL;
2768                 goto sctp_from_the_top2;
2769         }
2770         return (NULL);
2771 }
2772
2773 static struct sctp_ifa *
2774 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2775     struct sctp_inpcb *inp,
2776     struct sctp_tcb *stcb,
2777     int non_asoc_addr_ok,
2778     uint8_t dest_is_loop,
2779     uint8_t dest_is_priv,
2780     int addr_wanted,
2781     sa_family_t fam,
2782     sctp_route_t * ro
2783 )
2784 {
2785         struct sctp_ifa *ifa, *sifa;
2786         int num_eligible_addr = 0;
2787
2788 #ifdef INET6
2789         struct sockaddr_in6 sin6, lsa6;
2790
2791         if (fam == AF_INET6) {
2792                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793                 (void)sa6_recoverscope(&sin6);
2794         }
2795 #endif                          /* INET6 */
2796         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797 #ifdef INET
2798                 if ((ifa->address.sa.sa_family == AF_INET) &&
2799                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin.sin_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804 #ifdef INET6
2805                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2806                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807                     &ifa->address.sin6.sin6_addr) != 0)) {
2808                         continue;
2809                 }
2810 #endif
2811                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812                     (non_asoc_addr_ok == 0))
2813                         continue;
2814                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815                     dest_is_priv, fam);
2816                 if (sifa == NULL)
2817                         continue;
2818 #ifdef INET6
2819                 if (fam == AF_INET6 &&
2820                     dest_is_loop &&
2821                     sifa->src_is_loop && sifa->src_is_priv) {
2822                         /*
2823                          * don't allow fe80::1 to be a src on loop ::1, we
2824                          * don't list it to the peer so we will get an
2825                          * abort.
2826                          */
2827                         continue;
2828                 }
2829                 if (fam == AF_INET6 &&
2830                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832                         /*
2833                          * link-local <-> link-local must belong to the same
2834                          * scope.
2835                          */
2836                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837                         (void)sa6_recoverscope(&lsa6);
2838                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839                                 continue;
2840                         }
2841                 }
2842 #endif                          /* INET6 */
2843
2844                 /*
2845                  * Check if the IPv6 address matches to next-hop. In the
2846                  * mobile case, old IPv6 address may be not deleted from the
2847                  * interface. Then, the interface has previous and new
2848                  * addresses.  We should use one corresponding to the
2849                  * next-hop.  (by micchie)
2850                  */
2851 #ifdef INET6
2852                 if (stcb && fam == AF_INET6 &&
2853                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855                             == 0) {
2856                                 continue;
2857                         }
2858                 }
2859 #endif
2860 #ifdef INET
2861                 /* Avoid topologically incorrect IPv4 address */
2862                 if (stcb && fam == AF_INET &&
2863                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865                                 continue;
2866                         }
2867                 }
2868 #endif
2869                 if (stcb) {
2870                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871                                 continue;
2872                         }
2873                         if (((non_asoc_addr_ok == 0) &&
2874                             (sctp_is_addr_restricted(stcb, sifa))) ||
2875                             (non_asoc_addr_ok &&
2876                             (sctp_is_addr_restricted(stcb, sifa)) &&
2877                             (!sctp_is_addr_pending(stcb, sifa)))) {
2878                                 /*
2879                                  * It is restricted for some reason..
2880                                  * probably not yet added.
2881                                  */
2882                                 continue;
2883                         }
2884                 }
2885                 if (num_eligible_addr >= addr_wanted) {
2886                         return (sifa);
2887                 }
2888                 num_eligible_addr++;
2889         }
2890         return (NULL);
2891 }
2892
2893
2894 static int
2895 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896     struct sctp_inpcb *inp,
2897     struct sctp_tcb *stcb,
2898     int non_asoc_addr_ok,
2899     uint8_t dest_is_loop,
2900     uint8_t dest_is_priv,
2901     sa_family_t fam)
2902 {
2903         struct sctp_ifa *ifa, *sifa;
2904         int num_eligible_addr = 0;
2905
2906         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907 #ifdef INET
2908                 if ((ifa->address.sa.sa_family == AF_INET) &&
2909                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin.sin_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914 #ifdef INET6
2915                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2916                     (stcb != NULL) &&
2917                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918                     &ifa->address.sin6.sin6_addr) != 0)) {
2919                         continue;
2920                 }
2921 #endif
2922                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923                     (non_asoc_addr_ok == 0)) {
2924                         continue;
2925                 }
2926                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927                     dest_is_priv, fam);
2928                 if (sifa == NULL) {
2929                         continue;
2930                 }
2931                 if (stcb) {
2932                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933                                 continue;
2934                         }
2935                         if (((non_asoc_addr_ok == 0) &&
2936                             (sctp_is_addr_restricted(stcb, sifa))) ||
2937                             (non_asoc_addr_ok &&
2938                             (sctp_is_addr_restricted(stcb, sifa)) &&
2939                             (!sctp_is_addr_pending(stcb, sifa)))) {
2940                                 /*
2941                                  * It is restricted for some reason..
2942                                  * probably not yet added.
2943                                  */
2944                                 continue;
2945                         }
2946                 }
2947                 num_eligible_addr++;
2948         }
2949         return (num_eligible_addr);
2950 }
2951
2952 static struct sctp_ifa *
2953 sctp_choose_boundall(struct sctp_inpcb *inp,
2954     struct sctp_tcb *stcb,
2955     struct sctp_nets *net,
2956     sctp_route_t * ro,
2957     uint32_t vrf_id,
2958     uint8_t dest_is_priv,
2959     uint8_t dest_is_loop,
2960     int non_asoc_addr_ok,
2961     sa_family_t fam)
2962 {
2963         int cur_addr_num = 0, num_preferred = 0;
2964         void *ifn;
2965         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966         struct sctp_ifa *sctp_ifa, *sifa;
2967         uint32_t ifn_index;
2968         struct sctp_vrf *vrf;
2969
2970 #ifdef INET
2971         int retried = 0;
2972
2973 #endif
2974
2975         /*-
2976          * For boundall we can use any address in the association.
2977          * If non_asoc_addr_ok is set we can use any address (at least in
2978          * theory). So we look for preferred addresses first. If we find one,
2979          * we use it. Otherwise we next try to get an address on the
2980          * interface, which we should be able to do (unless non_asoc_addr_ok
2981          * is false and we are routed out that way). In these cases where we
2982          * can't use the address of the interface we go through all the
2983          * ifn's looking for an address we can use and fill that in. Punting
2984          * means we send back address 0, which will probably cause problems
2985          * actually since then IP will fill in the address of the route ifn,
2986          * which means we probably already rejected it.. i.e. here comes an
2987          * abort :-<.
2988          */
2989         vrf = sctp_find_vrf(vrf_id);
2990         if (vrf == NULL)
2991                 return (NULL);
2992
2993         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997         if (sctp_ifn == NULL) {
2998                 /* ?? We don't have this guy ?? */
2999                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000                 goto bound_all_plan_b;
3001         }
3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003             ifn_index, sctp_ifn->ifn_name);
3004
3005         if (net) {
3006                 cur_addr_num = net->indx_of_eligible_next_to_use;
3007         }
3008         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009             inp, stcb,
3010             non_asoc_addr_ok,
3011             dest_is_loop,
3012             dest_is_priv, fam);
3013         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014             num_preferred, sctp_ifn->ifn_name);
3015         if (num_preferred == 0) {
3016                 /*
3017                  * no eligible addresses, we must use some other interface
3018                  * address if we can find one.
3019                  */
3020                 goto bound_all_plan_b;
3021         }
3022         /*
3023          * Ok we have num_eligible_addr set with how many we can use, this
3024          * may vary from call to call due to addresses being deprecated
3025          * etc..
3026          */
3027         if (cur_addr_num >= num_preferred) {
3028                 cur_addr_num = 0;
3029         }
3030         /*
3031          * select the nth address from the list (where cur_addr_num is the
3032          * nth) and 0 is the first one, 1 is the second one etc...
3033          */
3034         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037             dest_is_priv, cur_addr_num, fam, ro);
3038
3039         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3040         if (sctp_ifa) {
3041                 atomic_add_int(&sctp_ifa->refcount, 1);
3042                 if (net) {
3043                         /* save off where the next one we will want */
3044                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045                 }
3046                 return (sctp_ifa);
3047         }
3048         /*
3049          * plan_b: Look at all interfaces and find a preferred address. If
3050          * no preferred fall through to plan_c.
3051          */
3052 bound_all_plan_b:
3053         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056                     sctp_ifn->ifn_name);
3057                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058                         /* wrong base scope */
3059                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060                         continue;
3061                 }
3062                 if ((sctp_ifn == looked_at) && looked_at) {
3063                         /* already looked at this guy */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065                         continue;
3066                 }
3067                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068                     dest_is_loop, dest_is_priv, fam);
3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070                     "Found ifn:%p %d preferred source addresses\n",
3071                     ifn, num_preferred);
3072                 if (num_preferred == 0) {
3073                         /* None on this interface. */
3074                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3075                         continue;
3076                 }
3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081                 /*
3082                  * Ok we have num_eligible_addr set with how many we can
3083                  * use, this may vary from call to call due to addresses
3084                  * being deprecated etc..
3085                  */
3086                 if (cur_addr_num >= num_preferred) {
3087                         cur_addr_num = 0;
3088                 }
3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090                     dest_is_priv, cur_addr_num, fam, ro);
3091                 if (sifa == NULL)
3092                         continue;
3093                 if (net) {
3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096                             cur_addr_num);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101                 }
3102                 atomic_add_int(&sifa->refcount, 1);
3103                 return (sifa);
3104         }
3105 #ifdef INET
3106 again_with_private_addresses_allowed:
3107 #endif
3108         /* plan_c: do we have an acceptable address on the emit interface */
3109         sifa = NULL;
3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111         if (emit_ifn == NULL) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113                 goto plan_d;
3114         }
3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117 #ifdef INET
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125 #ifdef INET6
3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130                         continue;
3131                 }
3132 #endif
3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134                     (non_asoc_addr_ok == 0)) {
3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136                         continue;
3137                 }
3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139                     dest_is_priv, fam);
3140                 if (sifa == NULL) {
3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142                         continue;
3143                 }
3144                 if (stcb) {
3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147                                 sifa = NULL;
3148                                 continue;
3149                         }
3150                         if (((non_asoc_addr_ok == 0) &&
3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
3152                             (non_asoc_addr_ok &&
3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
3155                                 /*
3156                                  * It is restricted for some reason..
3157                                  * probably not yet added.
3158                                  */
3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3160                                 sifa = NULL;
3161                                 continue;
3162                         }
3163                 } else {
3164                         SCTP_PRINTF("Stcb is null - no print\n");
3165                 }
3166                 atomic_add_int(&sifa->refcount, 1);
3167                 goto out;
3168         }
3169 plan_d:
3170         /*
3171          * plan_d: We are in trouble. No preferred address on the emit
3172          * interface. And not even a preferred address on all interfaces. Go
3173          * out and see if we can find an acceptable address somewhere
3174          * amongst all interfaces.
3175          */
3176         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179                         /* wrong base scope */
3180                         continue;
3181                 }
3182                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183 #ifdef INET
3184                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3187                                 continue;
3188                         }
3189 #endif
3190 #ifdef INET6
3191                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194                                 continue;
3195                         }
3196 #endif
3197                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198                             (non_asoc_addr_ok == 0))
3199                                 continue;
3200                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201                             dest_is_loop,
3202                             dest_is_priv, fam);
3203                         if (sifa == NULL)
3204                                 continue;
3205                         if (stcb) {
3206                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207                                         sifa = NULL;
3208                                         continue;
3209                                 }
3210                                 if (((non_asoc_addr_ok == 0) &&
3211                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3212                                     (non_asoc_addr_ok &&
3213                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3214                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3215                                         /*
3216                                          * It is restricted for some
3217                                          * reason.. probably not yet added.
3218                                          */
3219                                         sifa = NULL;
3220                                         continue;
3221                                 }
3222                         }
3223                         goto out;
3224                 }
3225         }
3226 #ifdef INET
3227         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3228                 stcb->asoc.scope.ipv4_local_scope = 1;
3229                 retried = 1;
3230                 goto again_with_private_addresses_allowed;
3231         } else if (retried == 1) {
3232                 stcb->asoc.scope.ipv4_local_scope = 0;
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: - Find the route if needed, cache if I can. - Look at
3330          * interface address in route, Is it in the bound list. If so we
3331          * have the best source. - If not we must rotate amongst the
3332          * addresses.
3333          *
3334          * Cavets and issues
3335          *
3336          * Do we need to pay attention to scope. We can have a private address
3337          * or a global address we are sourcing or sending to. So if we draw
3338          * it out
3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340          * For V4
3341          * ------------------------------------------
3342          *      source     *      dest  *  result
3343          * -----------------------------------------
3344          * <a>  Private    *    Global  *  NAT
3345          * -----------------------------------------
3346          * <b>  Private    *    Private *  No problem
3347          * -----------------------------------------
3348          * <c>  Global     *    Private *  Huh, How will this work?
3349          * -----------------------------------------
3350          * <d>  Global     *    Global  *  No Problem
3351          *------------------------------------------
3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353          * For V6
3354          *------------------------------------------
3355          *      source     *      dest  *  result
3356          * -----------------------------------------
3357          * <a>  Linklocal  *    Global  *
3358          * -----------------------------------------
3359          * <b>  Linklocal  * Linklocal  *  No problem
3360          * -----------------------------------------
3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
3362          * -----------------------------------------
3363          * <d>  Global     *    Global  *  No Problem
3364          *------------------------------------------
3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366          *
3367          * And then we add to that what happens if there are multiple addresses
3368          * assigned to an interface. Remember the ifa on a ifn is a linked
3369          * list of addresses. So one interface can have more than one IP
3370          * address. What happens if we have both a private and a global
3371          * address? Do we then use context of destination to sort out which
3372          * one is best? And what about NAT's sending P->G may get you a NAT
3373          * translation, or should you select the G thats on the interface in
3374          * preference.
3375          *
3376          * Decisions:
3377          *
3378          * - count the number of addresses on the interface.
3379          * - if it is one, no problem except case <c>.
3380          *   For <a> we will assume a NAT out there.
3381          * - if there are more than one, then we need to worry about scope P
3382          *   or G. We should prefer G -> G and P -> P if possible.
3383          *   Then as a secondary fall back to mixed types G->P being a last
3384          *   ditch one.
3385          * - The above all works for bound all, but bound specific we need to
3386          *   use the same concept but instead only consider the bound
3387          *   addresses. If the bound set is NOT assigned to the interface then
3388          *   we must use rotation amongst the bound addresses..
3389          */
3390         if (ro->ro_rt == NULL) {
3391                 /*
3392                  * Need a route to cache.
3393                  */
3394                 SCTP_RTALLOC(ro, vrf_id);
3395         }
3396         if (ro->ro_rt == NULL) {
3397                 return (NULL);
3398         }
3399         fam = ro->ro_dst.sa_family;
3400         dest_is_priv = dest_is_loop = 0;
3401         /* Setup our scopes for the destination */
3402         switch (fam) {
3403 #ifdef INET
3404         case AF_INET:
3405                 /* Scope based on outbound address */
3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407                         dest_is_loop = 1;
3408                         if (net != NULL) {
3409                                 /* mark it as local */
3410                                 net->addr_is_local = 1;
3411                         }
3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413                         dest_is_priv = 1;
3414                 }
3415                 break;
3416 #endif
3417 #ifdef INET6
3418         case AF_INET6:
3419                 /* Scope based on outbound address */
3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422                         /*
3423                          * If the address is a loopback address, which
3424                          * consists of "::1" OR "fe80::1%lo0", we are
3425                          * loopback scope. But we don't use dest_is_priv
3426                          * (link local addresses).
3427                          */
3428                         dest_is_loop = 1;
3429                         if (net != NULL) {
3430                                 /* mark it as local */
3431                                 net->addr_is_local = 1;
3432                         }
3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434                         dest_is_priv = 1;
3435                 }
3436                 break;
3437 #endif
3438         }
3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441         SCTP_IPI_ADDR_RLOCK();
3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443                 /*
3444                  * Bound all case
3445                  */
3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447                     dest_is_priv, dest_is_loop,
3448                     non_asoc_addr_ok, fam);
3449                 SCTP_IPI_ADDR_RUNLOCK();
3450                 return (answer);
3451         }
3452         /*
3453          * Subset bound case
3454          */
3455         if (stcb) {
3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457                     vrf_id, dest_is_priv,
3458                     dest_is_loop,
3459                     non_asoc_addr_ok, fam);
3460         } else {
3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462                     non_asoc_addr_ok,
3463                     dest_is_priv,
3464                     dest_is_loop, fam);
3465         }
3466         SCTP_IPI_ADDR_RUNLOCK();
3467         return (answer);
3468 }
3469
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473         struct cmsghdr cmh;
3474         int tlen, at, found;
3475         struct sctp_sndinfo sndinfo;
3476         struct sctp_prinfo prinfo;
3477         struct sctp_authinfo authinfo;
3478
3479         tlen = SCTP_BUF_LEN(control);
3480         at = 0;
3481         found = 0;
3482         /*
3483          * Independent of how many mbufs, find the c_type inside the control
3484          * structure and copy out the data.
3485          */
3486         while (at < tlen) {
3487                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3488                         /* There is not enough room for one more. */
3489                         return (found);
3490                 }
3491                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3492                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3493                         /* We dont't have a complete CMSG header. */
3494                         return (found);
3495                 }
3496                 if (((int)cmh.cmsg_len + at) > tlen) {
3497                         /* We don't have the complete CMSG. */
3498                         return (found);
3499                 }
3500                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3501                     ((c_type == cmh.cmsg_type) ||
3502                     ((c_type == SCTP_SNDRCV) &&
3503                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3504                     (cmh.cmsg_type == SCTP_PRINFO) ||
3505                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3506                         if (c_type == cmh.cmsg_type) {
3507                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3508                                         return (found);
3509                                 }
3510                                 /* It is exactly what we want. Copy it out. */
3511                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3512                                 return (1);
3513                         } else {
3514                                 struct sctp_sndrcvinfo *sndrcvinfo;
3515
3516                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3517                                 if (found == 0) {
3518                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3519                                                 return (found);
3520                                         }
3521                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3522                                 }
3523                                 switch (cmh.cmsg_type) {
3524                                 case SCTP_SNDINFO:
3525                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3526                                                 return (found);
3527                                         }
3528                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3529                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3530                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3531                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3532                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3533                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3534                                         break;
3535                                 case SCTP_PRINFO:
3536                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3537                                                 return (found);
3538                                         }
3539                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3540                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3541                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3542                                         } else {
3543                                                 sndrcvinfo->sinfo_timetolive = 0;
3544                                         }
3545                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3546                                         break;
3547                                 case SCTP_AUTHINFO:
3548                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3549                                                 return (found);
3550                                         }
3551                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3552                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3553                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3554                                         break;
3555                                 default:
3556                                         return (found);
3557                                 }
3558                                 found = 1;
3559                         }
3560                 }
3561                 at += CMSG_ALIGN(cmh.cmsg_len);
3562         }
3563         return (found);
3564 }
3565
3566 static int
3567 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3568 {
3569         struct cmsghdr cmh;
3570         int tlen, at;
3571         struct sctp_initmsg initmsg;
3572
3573 #ifdef INET
3574         struct sockaddr_in sin;
3575
3576 #endif
3577 #ifdef INET6
3578         struct sockaddr_in6 sin6;
3579
3580 #endif
3581
3582         tlen = SCTP_BUF_LEN(control);
3583         at = 0;
3584         while (at < tlen) {
3585                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3586                         /* There is not enough room for one more. */
3587                         *error = EINVAL;
3588                         return (1);
3589                 }
3590                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3591                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3592                         /* We dont't have a complete CMSG header. */
3593                         *error = EINVAL;
3594                         return (1);
3595                 }
3596                 if (((int)cmh.cmsg_len + at) > tlen) {
3597                         /* We don't have the complete CMSG. */
3598                         *error = EINVAL;
3599                         return (1);
3600                 }
3601                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3602                         switch (cmh.cmsg_type) {
3603                         case SCTP_INIT:
3604                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3605                                         *error = EINVAL;
3606                                         return (1);
3607                                 }
3608                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3609                                 if (initmsg.sinit_max_attempts)
3610                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3611                                 if (initmsg.sinit_num_ostreams)
3612                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3613                                 if (initmsg.sinit_max_instreams)
3614                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3615                                 if (initmsg.sinit_max_init_timeo)
3616                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3617                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3618                                         struct sctp_stream_out *tmp_str;
3619                                         unsigned int i;
3620
3621 #if defined(SCTP_DETAILED_STR_STATS)
3622                                         int j;
3623
3624 #endif
3625
3626                                         /* Default is NOT correct */
3627                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3628                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3629                                         SCTP_TCB_UNLOCK(stcb);
3630                                         SCTP_MALLOC(tmp_str,
3631                                             struct sctp_stream_out *,
3632                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3633                                             SCTP_M_STRMO);
3634                                         SCTP_TCB_LOCK(stcb);
3635                                         if (tmp_str != NULL) {
3636                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3637                                                 stcb->asoc.strmout = tmp_str;
3638                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3639                                         } else {
3640                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3641                                         }
3642                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3643                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3644                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3645                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3646 #if defined(SCTP_DETAILED_STR_STATS)
3647                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3648                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3649                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3650                                                 }
3651 #else
3652                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3653                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3654 #endif
3655                                                 stcb->asoc.strmout[i].stream_no = i;
3656                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3657                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3658                                         }
3659                                 }
3660                                 break;
3661 #ifdef INET
3662                         case SCTP_DSTADDRV4:
3663                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3664                                         *error = EINVAL;
3665                                         return (1);
3666                                 }
3667                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3668                                 sin.sin_family = AF_INET;
3669                                 sin.sin_len = sizeof(struct sockaddr_in);
3670                                 sin.sin_port = stcb->rport;
3671                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3672                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3673                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3674                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3675                                         *error = EINVAL;
3676                                         return (1);
3677                                 }
3678                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3679                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3680                                         *error = ENOBUFS;
3681                                         return (1);
3682                                 }
3683                                 break;
3684 #endif
3685 #ifdef INET6
3686                         case SCTP_DSTADDRV6:
3687                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3688                                         *error = EINVAL;
3689                                         return (1);
3690                                 }
3691                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3692                                 sin6.sin6_family = AF_INET6;
3693                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3694                                 sin6.sin6_port = stcb->rport;
3695                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3696                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3697                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3698                                         *error = EINVAL;
3699                                         return (1);
3700                                 }
3701 #ifdef INET
3702                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3703                                         in6_sin6_2_sin(&sin, &sin6);
3704                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3705                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3706                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3707                                                 *error = EINVAL;
3708                                                 return (1);
3709                                         }
3710                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3711                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3712                                                 *error = ENOBUFS;
3713                                                 return (1);
3714                                         }
3715                                 } else
3716 #endif
3717                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3718                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3719                                         *error = ENOBUFS;
3720                                         return (1);
3721                                 }
3722                                 break;
3723 #endif
3724                         default:
3725                                 break;
3726                         }
3727                 }
3728                 at += CMSG_ALIGN(cmh.cmsg_len);
3729         }
3730         return (0);
3731 }
3732
3733 static struct sctp_tcb *
3734 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3735     uint16_t port,
3736     struct mbuf *control,
3737     struct sctp_nets **net_p,
3738     int *error)
3739 {
3740         struct cmsghdr cmh;
3741         int tlen, at;
3742         struct sctp_tcb *stcb;
3743         struct sockaddr *addr;
3744
3745 #ifdef INET
3746         struct sockaddr_in sin;
3747
3748 #endif
3749 #ifdef INET6
3750         struct sockaddr_in6 sin6;
3751
3752 #endif
3753
3754         tlen = SCTP_BUF_LEN(control);
3755         at = 0;
3756         while (at < tlen) {
3757                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3758                         /* There is not enough room for one more. */
3759                         *error = EINVAL;
3760                         return (NULL);
3761                 }
3762                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3763                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3764                         /* We dont't have a complete CMSG header. */
3765                         *error = EINVAL;
3766                         return (NULL);
3767                 }
3768                 if (((int)cmh.cmsg_len + at) > tlen) {
3769                         /* We don't have the complete CMSG. */
3770                         *error = EINVAL;
3771                         return (NULL);
3772                 }
3773                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3774                         switch (cmh.cmsg_type) {
3775 #ifdef INET
3776                         case SCTP_DSTADDRV4:
3777                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3778                                         *error = EINVAL;
3779                                         return (NULL);
3780                                 }
3781                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3782                                 sin.sin_family = AF_INET;
3783                                 sin.sin_len = sizeof(struct sockaddr_in);
3784                                 sin.sin_port = port;
3785                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3786                                 addr = (struct sockaddr *)&sin;
3787                                 break;
3788 #endif
3789 #ifdef INET6
3790                         case SCTP_DSTADDRV6:
3791                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3792                                         *error = EINVAL;
3793                                         return (NULL);
3794                                 }
3795                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3796                                 sin6.sin6_family = AF_INET6;
3797                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3798                                 sin6.sin6_port = port;
3799                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3800 #ifdef INET
3801                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3802                                         in6_sin6_2_sin(&sin, &sin6);
3803                                         addr = (struct sockaddr *)&sin;
3804                                 } else
3805 #endif
3806                                         addr = (struct sockaddr *)&sin6;
3807                                 break;
3808 #endif
3809                         default:
3810                                 addr = NULL;
3811                                 break;
3812                         }
3813                         if (addr) {
3814                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3815                                 if (stcb != NULL) {
3816                                         return (stcb);
3817                                 }
3818                         }
3819                 }
3820                 at += CMSG_ALIGN(cmh.cmsg_len);
3821         }
3822         return (NULL);
3823 }
3824
3825 static struct mbuf *
3826 sctp_add_cookie(struct mbuf *init, int init_offset,
3827     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3828 {
3829         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3830         struct sctp_state_cookie *stc;
3831         struct sctp_paramhdr *ph;
3832         uint8_t *foo;
3833         int sig_offset;
3834         uint16_t cookie_sz;
3835
3836         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3837             sizeof(struct sctp_paramhdr)), 0,
3838             M_NOWAIT, 1, MT_DATA);
3839         if (mret == NULL) {
3840                 return (NULL);
3841         }
3842         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3843         if (copy_init == NULL) {
3844                 sctp_m_freem(mret);
3845                 return (NULL);
3846         }
3847 #ifdef SCTP_MBUF_LOGGING
3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849                 struct mbuf *mat;
3850
3851                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3852                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3853                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3854                         }
3855                 }
3856         }
3857 #endif
3858         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3859             M_NOWAIT);
3860         if (copy_initack == NULL) {
3861                 sctp_m_freem(mret);
3862                 sctp_m_freem(copy_init);
3863                 return (NULL);
3864         }
3865 #ifdef SCTP_MBUF_LOGGING
3866         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3867                 struct mbuf *mat;
3868
3869                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3870                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3871                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3872                         }
3873                 }
3874         }
3875 #endif
3876         /* easy side we just drop it on the end */
3877         ph = mtod(mret, struct sctp_paramhdr *);
3878         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3879             sizeof(struct sctp_paramhdr);
3880         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3881             sizeof(struct sctp_paramhdr));
3882         ph->param_type = htons(SCTP_STATE_COOKIE);
3883         ph->param_length = 0;   /* fill in at the end */
3884         /* Fill in the stc cookie data */
3885         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3886
3887         /* tack the INIT and then the INIT-ACK onto the chain */
3888         cookie_sz = 0;
3889         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890                 cookie_sz += SCTP_BUF_LEN(m_at);
3891                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3892                         SCTP_BUF_NEXT(m_at) = copy_init;
3893                         break;
3894                 }
3895         }
3896         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3897                 cookie_sz += SCTP_BUF_LEN(m_at);
3898                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3899                         SCTP_BUF_NEXT(m_at) = copy_initack;
3900                         break;
3901                 }
3902         }
3903         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3904                 cookie_sz += SCTP_BUF_LEN(m_at);
3905                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3906                         break;
3907                 }
3908         }
3909         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3910         if (sig == NULL) {
3911                 /* no space, so free the entire chain */
3912                 sctp_m_freem(mret);
3913                 return (NULL);
3914         }
3915         SCTP_BUF_LEN(sig) = 0;
3916         SCTP_BUF_NEXT(m_at) = sig;
3917         sig_offset = 0;
3918         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3919         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3920         *signature = foo;
3921         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3922         cookie_sz += SCTP_SIGNATURE_SIZE;
3923         ph->param_length = htons(cookie_sz);
3924         return (mret);
3925 }
3926
3927
3928 static uint8_t
3929 sctp_get_ect(struct sctp_tcb *stcb)
3930 {
3931         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3932                 return (SCTP_ECT0_BIT);
3933         } else {
3934                 return (0);
3935         }
3936 }
3937
3938 #if defined(INET) || defined(INET6)
3939 static void
3940 sctp_handle_no_route(struct sctp_tcb *stcb,
3941     struct sctp_nets *net,
3942     int so_locked)
3943 {
3944         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3945
3946         if (net) {
3947                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3948                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3949                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3950                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3951                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3952                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3953                                     stcb, 0,
3954                                     (void *)net,
3955                                     so_locked);
3956                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3957                                 net->dest_state &= ~SCTP_ADDR_PF;
3958                         }
3959                 }
3960                 if (stcb) {
3961                         if (net == stcb->asoc.primary_destination) {
3962                                 /* need a new primary */
3963                                 struct sctp_nets *alt;
3964
3965                                 alt = sctp_find_alternate_net(stcb, net, 0);
3966                                 if (alt != net) {
3967                                         if (stcb->asoc.alternate) {
3968                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3969                                         }
3970                                         stcb->asoc.alternate = alt;
3971                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3972                                         if (net->ro._s_addr) {
3973                                                 sctp_free_ifa(net->ro._s_addr);
3974                                                 net->ro._s_addr = NULL;
3975                                         }
3976                                         net->src_addr_selected = 0;
3977                                 }
3978                         }
3979                 }
3980         }
3981 }
3982
3983 #endif
3984
3985 static int
3986 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3987     struct sctp_tcb *stcb,      /* may be NULL */
3988     struct sctp_nets *net,
3989     struct sockaddr *to,
3990     struct mbuf *m,
3991     uint32_t auth_offset,
3992     struct sctp_auth_chunk *auth,
3993     uint16_t auth_keyid,
3994     int nofragment_flag,
3995     int ecn_ok,
3996     int out_of_asoc_ok,
3997     uint16_t src_port,
3998     uint16_t dest_port,
3999     uint32_t v_tag,
4000     uint16_t port,
4001     union sctp_sockstore *over_addr,
4002     uint8_t use_mflowid, uint32_t mflowid,
4003 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4004     int so_locked SCTP_UNUSED
4005 #else
4006     int so_locked
4007 #endif
4008 )
4009 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4010 {
4011         /**
4012          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4013          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4014          * - fill in the HMAC digest of any AUTH chunk in the packet.
4015          * - calculate and fill in the SCTP checksum.
4016          * - prepend an IP address header.
4017          * - if boundall use INADDR_ANY.
4018          * - if boundspecific do source address selection.
4019          * - set fragmentation option for ipV4.
4020          * - On return from IP output, check/adjust mtu size of output
4021          *   interface and smallest_mtu size as well.
4022          */
4023         /* Will need ifdefs around this */
4024         struct mbuf *newm;
4025         struct sctphdr *sctphdr;
4026         int packet_length;
4027         int ret;
4028
4029 #if defined(INET) || defined(INET6)
4030         uint32_t vrf_id;
4031
4032 #endif
4033 #if defined(INET) || defined(INET6)
4034         struct mbuf *o_pak;
4035         sctp_route_t *ro = NULL;
4036         struct udphdr *udp = NULL;
4037
4038 #endif
4039         uint8_t tos_value;
4040
4041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4042         struct socket *so = NULL;
4043
4044 #endif
4045
4046         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4047                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4048                 sctp_m_freem(m);
4049                 return (EFAULT);
4050         }
4051 #if defined(INET) || defined(INET6)
4052         if (stcb) {
4053                 vrf_id = stcb->asoc.vrf_id;
4054         } else {
4055                 vrf_id = inp->def_vrf_id;
4056         }
4057 #endif
4058         /* fill in the HMAC digest for any AUTH chunk in the packet */
4059         if ((auth != NULL) && (stcb != NULL)) {
4060                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4061         }
4062         if (net) {
4063                 tos_value = net->dscp;
4064         } else if (stcb) {
4065                 tos_value = stcb->asoc.default_dscp;
4066         } else {
4067                 tos_value = inp->sctp_ep.default_dscp;
4068         }
4069
4070         switch (to->sa_family) {
4071 #ifdef INET
4072         case AF_INET:
4073                 {
4074                         struct ip *ip = NULL;
4075                         sctp_route_t iproute;
4076                         int len;
4077
4078                         len = sizeof(struct ip) + sizeof(struct sctphdr);
4079                         if (port) {
4080                                 len += sizeof(struct udphdr);
4081                         }
4082                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4083                         if (newm == NULL) {
4084                                 sctp_m_freem(m);
4085                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4086                                 return (ENOMEM);
4087                         }
4088                         SCTP_ALIGN_TO_END(newm, len);
4089                         SCTP_BUF_LEN(newm) = len;
4090                         SCTP_BUF_NEXT(newm) = m;
4091                         m = newm;
4092                         if (net != NULL) {
4093 #ifdef INVARIANTS
4094                                 if (net->flowidset == 0) {
4095                                         panic("Flow ID not set");
4096                                 }
4097 #endif
4098                                 m->m_pkthdr.flowid = net->flowid;
4099                                 m->m_flags |= M_FLOWID;
4100                         } else {
4101                                 if (use_mflowid != 0) {
4102                                         m->m_pkthdr.flowid = mflowid;
4103                                         m->m_flags |= M_FLOWID;
4104                                 }
4105                         }
4106                         packet_length = sctp_calculate_len(m);
4107                         ip = mtod(m, struct ip *);
4108                         ip->ip_v = IPVERSION;
4109                         ip->ip_hl = (sizeof(struct ip) >> 2);
4110                         if (tos_value == 0) {
4111                                 /*
4112                                  * This means especially, that it is not set
4113                                  * at the SCTP layer. So use the value from
4114                                  * the IP layer.
4115                                  */
4116                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4117                         }
4118                         tos_value &= 0xfc;
4119                         if (ecn_ok) {
4120                                 tos_value |= sctp_get_ect(stcb);
4121                         }
4122                         if ((nofragment_flag) && (port == 0)) {
4123                                 ip->ip_off = htons(IP_DF);
4124                         } else {
4125                                 ip->ip_off = htons(0);
4126                         }
4127                         /* FreeBSD has a function for ip_id's */
4128                         ip->ip_id = ip_newid();
4129
4130                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4131                         ip->ip_len = htons(packet_length);
4132                         ip->ip_tos = tos_value;
4133                         if (port) {
4134                                 ip->ip_p = IPPROTO_UDP;
4135                         } else {
4136                                 ip->ip_p = IPPROTO_SCTP;
4137                         }
4138                         ip->ip_sum = 0;
4139                         if (net == NULL) {
4140                                 ro = &iproute;
4141                                 memset(&iproute, 0, sizeof(iproute));
4142                                 memcpy(&ro->ro_dst, to, to->sa_len);
4143                         } else {
4144                                 ro = (sctp_route_t *) & net->ro;
4145                         }
4146                         /* Now the address selection part */
4147                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4148
4149                         /* call the routine to select the src address */
4150                         if (net && out_of_asoc_ok == 0) {
4151                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4152                                         sctp_free_ifa(net->ro._s_addr);
4153                                         net->ro._s_addr = NULL;
4154                                         net->src_addr_selected = 0;
4155                                         if (ro->ro_rt) {
4156                                                 RTFREE(ro->ro_rt);
4157                                                 ro->ro_rt = NULL;
4158                                         }
4159                                 }
4160                                 if (net->src_addr_selected == 0) {
4161                                         /* Cache the source address */
4162                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4163                                             ro, net, 0,
4164                                             vrf_id);
4165                                         net->src_addr_selected = 1;
4166                                 }
4167                                 if (net->ro._s_addr == NULL) {
4168                                         /* No route to host */
4169                                         net->src_addr_selected = 0;
4170                                         sctp_handle_no_route(stcb, net, so_locked);
4171                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4172                                         sctp_m_freem(m);
4173                                         return (EHOSTUNREACH);
4174                                 }
4175                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4176                         } else {
4177                                 if (over_addr == NULL) {
4178                                         struct sctp_ifa *_lsrc;
4179
4180                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4181                                             net,
4182                                             out_of_asoc_ok,
4183                                             vrf_id);
4184                                         if (_lsrc == NULL) {
4185                                                 sctp_handle_no_route(stcb, net, so_locked);
4186                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4187                                                 sctp_m_freem(m);
4188                                                 return (EHOSTUNREACH);
4189                                         }
4190                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4191                                         sctp_free_ifa(_lsrc);
4192                                 } else {
4193                                         ip->ip_src = over_addr->sin.sin_addr;
4194                                         SCTP_RTALLOC(ro, vrf_id);
4195                                 }
4196                         }
4197                         if (port) {
4198                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4199                                         sctp_handle_no_route(stcb, net, so_locked);
4200                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201                                         sctp_m_freem(m);
4202                                         return (EHOSTUNREACH);
4203                                 }
4204                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4205                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4206                                 udp->uh_dport = port;
4207                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4208                                 if (V_udp_cksum) {
4209                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4210                                 } else {
4211                                         udp->uh_sum = 0;
4212                                 }
4213                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4214                         } else {
4215                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4216                         }
4217
4218                         sctphdr->src_port = src_port;
4219                         sctphdr->dest_port = dest_port;
4220                         sctphdr->v_tag = v_tag;
4221                         sctphdr->checksum = 0;
4222
4223                         /*
4224                          * If source address selection fails and we find no
4225                          * route then the ip_output should fail as well with
4226                          * a NO_ROUTE_TO_HOST type error. We probably should
4227                          * catch that somewhere and abort the association
4228                          * right away (assuming this is an INIT being sent).
4229                          */
4230                         if (ro->ro_rt == NULL) {
4231                                 /*
4232                                  * src addr selection failed to find a route
4233                                  * (or valid source addr), so we can't get
4234                                  * there from here (yet)!
4235                                  */
4236                                 sctp_handle_no_route(stcb, net, so_locked);
4237                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4238                                 sctp_m_freem(m);
4239                                 return (EHOSTUNREACH);
4240                         }
4241                         if (ro != &iproute) {
4242                                 memcpy(&iproute, ro, sizeof(*ro));
4243                         }
4244                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4245                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4246                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4247                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4248                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4249                             (void *)ro->ro_rt);
4250
4251                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4252                                 /* failed to prepend data, give up */
4253                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4254                                 sctp_m_freem(m);
4255                                 return (ENOMEM);
4256                         }
4257                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4258                         if (port) {
4259 #if defined(SCTP_WITH_NO_CSUM)
4260                                 SCTP_STAT_INCR(sctps_sendnocrc);
4261 #else
4262                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4263                                 SCTP_STAT_INCR(sctps_sendswcrc);
4264 #endif
4265                                 if (V_udp_cksum) {
4266                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4267                                 }
4268                         } else {
4269 #if defined(SCTP_WITH_NO_CSUM)
4270                                 SCTP_STAT_INCR(sctps_sendnocrc);
4271 #else
4272                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4273                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4274                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4275 #endif
4276                         }
4277 #ifdef SCTP_PACKET_LOGGING
4278                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4279                                 sctp_packet_log(o_pak);
4280 #endif
4281                         /* send it out.  table id is taken from stcb */
4282 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4283                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4284                                 so = SCTP_INP_SO(inp);
4285                                 SCTP_SOCKET_UNLOCK(so, 0);
4286                         }
4287 #endif
4288                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4289 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4290                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4291                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4292                                 SCTP_TCB_UNLOCK(stcb);
4293                                 SCTP_SOCKET_LOCK(so, 0);
4294                                 SCTP_TCB_LOCK(stcb);
4295                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4296                         }
4297 #endif
4298                         SCTP_STAT_INCR(sctps_sendpackets);
4299                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4300                         if (ret)
4301                                 SCTP_STAT_INCR(sctps_senderrors);
4302
4303                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4304                         if (net == NULL) {
4305                                 /* free tempy routes */
4306                                 RO_RTFREE(ro);
4307                         } else {
4308                                 /*
4309                                  * PMTU check versus smallest asoc MTU goes
4310                                  * here
4311                                  */
4312                                 if ((ro->ro_rt != NULL) &&
4313                                     (net->ro._s_addr)) {
4314                                         uint32_t mtu;
4315
4316                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4317                                         if (net->port) {
4318                                                 mtu -= sizeof(struct udphdr);
4319                                         }
4320                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4321                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4322                                                 net->mtu = mtu;
4323                                         }
4324                                 } else if (ro->ro_rt == NULL) {
4325                                         /* route was freed */
4326                                         if (net->ro._s_addr &&
4327                                             net->src_addr_selected) {
4328                                                 sctp_free_ifa(net->ro._s_addr);
4329                                                 net->ro._s_addr = NULL;
4330                                         }
4331                                         net->src_addr_selected = 0;
4332                                 }
4333                         }
4334                         return (ret);
4335                 }
4336 #endif
4337 #ifdef INET6
4338         case AF_INET6:
4339                 {
4340                         uint32_t flowlabel, flowinfo;
4341                         struct ip6_hdr *ip6h;
4342                         struct route_in6 ip6route;
4343                         struct ifnet *ifp;
4344                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4345                         int prev_scope = 0;
4346                         struct sockaddr_in6 lsa6_storage;
4347                         int error;
4348                         u_short prev_port = 0;
4349                         int len;
4350
4351                         if (net) {
4352                                 flowlabel = net->flowlabel;
4353                         } else if (stcb) {
4354                                 flowlabel = stcb->asoc.default_flowlabel;
4355                         } else {
4356                                 flowlabel = inp->sctp_ep.default_flowlabel;
4357                         }
4358                         if (flowlabel == 0) {
4359                                 /*
4360                                  * This means especially, that it is not set
4361                                  * at the SCTP layer. So use the value from
4362                                  * the IP layer.
4363                                  */
4364                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4365                         }
4366                         flowlabel &= 0x000fffff;
4367                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4368                         if (port) {
4369                                 len += sizeof(struct udphdr);
4370                         }
4371                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4372                         if (newm == NULL) {
4373                                 sctp_m_freem(m);
4374                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4375                                 return (ENOMEM);
4376                         }
4377                         SCTP_ALIGN_TO_END(newm, len);
4378                         SCTP_BUF_LEN(newm) = len;
4379                         SCTP_BUF_NEXT(newm) = m;
4380                         m = newm;
4381                         if (net != NULL) {
4382 #ifdef INVARIANTS
4383                                 if (net->flowidset == 0) {
4384                                         panic("Flow ID not set");
4385                                 }
4386 #endif
4387                                 m->m_pkthdr.flowid = net->flowid;
4388                                 m->m_flags |= M_FLOWID;
4389                         } else {
4390                                 if (use_mflowid != 0) {
4391                                         m->m_pkthdr.flowid = mflowid;
4392                                         m->m_flags |= M_FLOWID;
4393                                 }
4394                         }
4395                         packet_length = sctp_calculate_len(m);
4396
4397                         ip6h = mtod(m, struct ip6_hdr *);
4398                         /* protect *sin6 from overwrite */
4399                         sin6 = (struct sockaddr_in6 *)to;
4400                         tmp = *sin6;
4401                         sin6 = &tmp;
4402
4403                         /* KAME hack: embed scopeid */
4404                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4405                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4406                                 return (EINVAL);
4407                         }
4408                         if (net == NULL) {
4409                                 memset(&ip6route, 0, sizeof(ip6route));
4410                                 ro = (sctp_route_t *) & ip6route;
4411                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4412                         } else {
4413                                 ro = (sctp_route_t *) & net->ro;
4414                         }
4415                         /*
4416                          * We assume here that inp_flow is in host byte
4417                          * order within the TCB!
4418                          */
4419                         if (tos_value == 0) {
4420                                 /*
4421                                  * This means especially, that it is not set
4422                                  * at the SCTP layer. So use the value from
4423                                  * the IP layer.
4424                                  */
4425                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4426                         }
4427                         tos_value &= 0xfc;
4428                         if (ecn_ok) {
4429                                 tos_value |= sctp_get_ect(stcb);
4430                         }
4431                         flowinfo = 0x06;
4432                         flowinfo <<= 8;
4433                         flowinfo |= tos_value;
4434                         flowinfo <<= 20;
4435                         flowinfo |= flowlabel;
4436                         ip6h->ip6_flow = htonl(flowinfo);
4437                         if (port) {
4438                                 ip6h->ip6_nxt = IPPROTO_UDP;
4439                         } else {
4440                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4441                         }
4442                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4443                         ip6h->ip6_dst = sin6->sin6_addr;
4444
4445                         /*
4446                          * Add SRC address selection here: we can only reuse
4447                          * to a limited degree the kame src-addr-sel, since
4448                          * we can try their selection but it may not be
4449                          * bound.
4450                          */
4451                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4452                         lsa6_tmp.sin6_family = AF_INET6;
4453                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4454                         lsa6 = &lsa6_tmp;
4455                         if (net && out_of_asoc_ok == 0) {
4456                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4457                                         sctp_free_ifa(net->ro._s_addr);
4458                                         net->ro._s_addr = NULL;
4459                                         net->src_addr_selected = 0;
4460                                         if (ro->ro_rt) {
4461                                                 RTFREE(ro->ro_rt);
4462                                                 ro->ro_rt = NULL;
4463                                         }
4464                                 }
4465                                 if (net->src_addr_selected == 0) {
4466                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4467                                         /* KAME hack: embed scopeid */
4468                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4469                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4470                                                 return (EINVAL);
4471                                         }
4472                                         /* Cache the source address */
4473                                         net->ro._s_addr = sctp_source_address_selection(inp,
4474                                             stcb,
4475                                             ro,
4476                                             net,
4477                                             0,
4478                                             vrf_id);
4479                                         (void)sa6_recoverscope(sin6);
4480                                         net->src_addr_selected = 1;
4481                                 }
4482                                 if (net->ro._s_addr == NULL) {
4483                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4484                                         net->src_addr_selected = 0;
4485                                         sctp_handle_no_route(stcb, net, so_locked);
4486                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4487                                         sctp_m_freem(m);
4488                                         return (EHOSTUNREACH);
4489                                 }
4490                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4491                         } else {
4492                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4493                                 /* KAME hack: embed scopeid */
4494                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4495                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4496                                         return (EINVAL);
4497                                 }
4498                                 if (over_addr == NULL) {
4499                                         struct sctp_ifa *_lsrc;
4500
4501                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4502                                             net,
4503                                             out_of_asoc_ok,
4504                                             vrf_id);
4505                                         if (_lsrc == NULL) {
4506                                                 sctp_handle_no_route(stcb, net, so_locked);
4507                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4508                                                 sctp_m_freem(m);
4509                                                 return (EHOSTUNREACH);
4510                                         }
4511                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4512                                         sctp_free_ifa(_lsrc);
4513                                 } else {
4514                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4515                                         SCTP_RTALLOC(ro, vrf_id);
4516                                 }
4517                                 (void)sa6_recoverscope(sin6);
4518                         }
4519                         lsa6->sin6_port = inp->sctp_lport;
4520
4521                         if (ro->ro_rt == NULL) {
4522                                 /*
4523                                  * src addr selection failed to find a route
4524                                  * (or valid source addr), so we can't get
4525                                  * there from here!
4526                                  */
4527                                 sctp_handle_no_route(stcb, net, so_locked);
4528                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4529                                 sctp_m_freem(m);
4530                                 return (EHOSTUNREACH);
4531                         }
4532                         /*
4533                          * XXX: sa6 may not have a valid sin6_scope_id in
4534                          * the non-SCOPEDROUTING case.
4535                          */
4536                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4537                         lsa6_storage.sin6_family = AF_INET6;
4538                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4539                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4540                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4541                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4542                                 sctp_m_freem(m);
4543                                 return (error);
4544                         }
4545                         /* XXX */
4546                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4547                         lsa6_storage.sin6_port = inp->sctp_lport;
4548                         lsa6 = &lsa6_storage;
4549                         ip6h->ip6_src = lsa6->sin6_addr;
4550
4551                         if (port) {
4552                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4553                                         sctp_handle_no_route(stcb, net, so_locked);
4554                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4555                                         sctp_m_freem(m);
4556                                         return (EHOSTUNREACH);
4557                                 }
4558                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4559                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4560                                 udp->uh_dport = port;
4561                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4562                                 udp->uh_sum = 0;
4563                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4564                         } else {
4565                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4566                         }
4567
4568                         sctphdr->src_port = src_port;
4569                         sctphdr->dest_port = dest_port;
4570                         sctphdr->v_tag = v_tag;
4571                         sctphdr->checksum = 0;
4572
4573                         /*
4574                          * We set the hop limit now since there is a good
4575                          * chance that our ro pointer is now filled
4576                          */
4577                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4578                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4579
4580 #ifdef SCTP_DEBUG
4581                         /* Copy to be sure something bad is not happening */
4582                         sin6->sin6_addr = ip6h->ip6_dst;
4583                         lsa6->sin6_addr = ip6h->ip6_src;
4584 #endif
4585
4586                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4587                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4588                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4589                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4590                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4591                         if (net) {
4592                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4593                                 /*
4594                                  * preserve the port and scope for link
4595                                  * local send
4596                                  */
4597                                 prev_scope = sin6->sin6_scope_id;
4598                                 prev_port = sin6->sin6_port;
4599                         }
4600                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4601                                 /* failed to prepend data, give up */
4602                                 sctp_m_freem(m);
4603                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4604                                 return (ENOMEM);
4605                         }
4606                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4607                         if (port) {
4608 #if defined(SCTP_WITH_NO_CSUM)
4609                                 SCTP_STAT_INCR(sctps_sendnocrc);
4610 #else
4611                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4612                                 SCTP_STAT_INCR(sctps_sendswcrc);
4613 #endif
4614                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4615                                         udp->uh_sum = 0xffff;
4616                                 }
4617                         } else {
4618 #if defined(SCTP_WITH_NO_CSUM)
4619                                 SCTP_STAT_INCR(sctps_sendnocrc);
4620 #else
4621                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4622                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4623                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4624 #endif
4625                         }
4626                         /* send it out. table id is taken from stcb */
4627 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4628                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4629                                 so = SCTP_INP_SO(inp);
4630                                 SCTP_SOCKET_UNLOCK(so, 0);
4631                         }
4632 #endif
4633 #ifdef SCTP_PACKET_LOGGING
4634                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4635                                 sctp_packet_log(o_pak);
4636 #endif
4637                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4638 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4639                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4640                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4641                                 SCTP_TCB_UNLOCK(stcb);
4642                                 SCTP_SOCKET_LOCK(so, 0);
4643                                 SCTP_TCB_LOCK(stcb);
4644                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4645                         }
4646 #endif
4647                         if (net) {
4648                                 /* for link local this must be done */
4649                                 sin6->sin6_scope_id = prev_scope;
4650                                 sin6->sin6_port = prev_port;
4651                         }
4652                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4653                         SCTP_STAT_INCR(sctps_sendpackets);
4654                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4655                         if (ret) {
4656                                 SCTP_STAT_INCR(sctps_senderrors);
4657                         }
4658                         if (net == NULL) {
4659                                 /* Now if we had a temp route free it */
4660                                 RO_RTFREE(ro);
4661                         } else {
4662                                 /*
4663                                  * PMTU check versus smallest asoc MTU goes
4664                                  * here
4665                                  */
4666                                 if (ro->ro_rt == NULL) {
4667                                         /* Route was freed */
4668                                         if (net->ro._s_addr &&
4669                                             net->src_addr_selected) {
4670                                                 sctp_free_ifa(net->ro._s_addr);
4671                                                 net->ro._s_addr = NULL;
4672                                         }
4673                                         net->src_addr_selected = 0;
4674                                 }
4675                                 if ((ro->ro_rt != NULL) &&
4676                                     (net->ro._s_addr)) {
4677                                         uint32_t mtu;
4678
4679                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4680                                         if (mtu &&
4681                                             (stcb->asoc.smallest_mtu > mtu)) {
4682                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4683                                                 net->mtu = mtu;
4684                                                 if (net->port) {
4685                                                         net->mtu -= sizeof(struct udphdr);
4686                                                 }
4687                                         }
4688                                 } else if (ifp) {
4689                                         if (ND_IFINFO(ifp)->linkmtu &&
4690                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4691                                                 sctp_mtu_size_reset(inp,
4692                                                     &stcb->asoc,
4693                                                     ND_IFINFO(ifp)->linkmtu);
4694                                         }
4695                                 }
4696                         }
4697                         return (ret);
4698                 }
4699 #endif
4700         default:
4701                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4702                     ((struct sockaddr *)to)->sa_family);
4703                 sctp_m_freem(m);
4704                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4705                 return (EFAULT);
4706         }
4707 }
4708
4709
4710 void
4711 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4712 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4713     SCTP_UNUSED
4714 #endif
4715 )
4716 {
4717         struct mbuf *m, *m_last;
4718         struct sctp_nets *net;
4719         struct sctp_init_chunk *init;
4720         struct sctp_supported_addr_param *sup_addr;
4721         struct sctp_adaptation_layer_indication *ali;
4722         struct sctp_supported_chunk_types_param *pr_supported;
4723         struct sctp_paramhdr *ph;
4724         int cnt_inits_to = 0;
4725         int ret;
4726         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4727
4728         /* INIT's always go to the primary (and usually ONLY address) */
4729         net = stcb->asoc.primary_destination;
4730         if (net == NULL) {
4731                 net = TAILQ_FIRST(&stcb->asoc.nets);
4732                 if (net == NULL) {
4733                         /* TSNH */
4734                         return;
4735                 }
4736                 /* we confirm any address we send an INIT to */
4737                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4738                 (void)sctp_set_primary_addr(stcb, NULL, net);
4739         } else {
4740                 /* we confirm any address we send an INIT to */
4741                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4742         }
4743         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4744 #ifdef INET6
4745         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4746                 /*
4747                  * special hook, if we are sending to link local it will not
4748                  * show up in our private address count.
4749                  */
4750                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4751                         cnt_inits_to = 1;
4752         }
4753 #endif
4754         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4755                 /* This case should not happen */
4756                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4757                 return;
4758         }
4759         /* start the INIT timer */
4760         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4761
4762         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4763         if (m == NULL) {
4764                 /* No memory, INIT timer will re-attempt. */
4765                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4766                 return;
4767         }
4768         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4769         padding_len = 0;
4770         /* Now lets put the chunk header in place */
4771         init = mtod(m, struct sctp_init_chunk *);
4772         /* now the chunk header */
4773         init->ch.chunk_type = SCTP_INITIATION;
4774         init->ch.chunk_flags = 0;
4775         /* fill in later from mbuf we build */
4776         init->ch.chunk_length = 0;
4777         /* place in my tag */
4778         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4779         /* set up some of the credits. */
4780         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4781             SCTP_MINIMAL_RWND));
4782         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4783         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4784         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4785
4786         /* Adaptation layer indication parameter */
4787         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4788                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4789                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4790                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4791                 ali->ph.param_length = htons(parameter_len);
4792                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4793                 chunk_len += parameter_len;
4794         }
4795         /* ECN parameter */
4796         if (stcb->asoc.ecn_supported == 1) {
4797                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4798                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4799                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4800                 ph->param_length = htons(parameter_len);
4801                 chunk_len += parameter_len;
4802         }
4803         /* PR-SCTP supported parameter */
4804         if (stcb->asoc.prsctp_supported == 1) {
4805                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4806                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4807                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4808                 ph->param_length = htons(parameter_len);
4809                 chunk_len += parameter_len;
4810         }
4811         /* Add NAT friendly parameter. */
4812         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4813                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4814                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4815                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4816                 ph->param_length = htons(parameter_len);
4817                 chunk_len += parameter_len;
4818         }
4819         /* And now tell the peer which extensions we support */
4820         num_ext = 0;
4821         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4822         if (stcb->asoc.prsctp_supported == 1) {
4823                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4824         }
4825         if (stcb->asoc.auth_supported == 1) {
4826                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4827         }
4828         if (stcb->asoc.asconf_supported == 1) {
4829                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4830                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4831         }
4832         if (stcb->asoc.reconfig_supported == 1) {
4833                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4834         }
4835         if (stcb->asoc.nrsack_supported == 1) {
4836                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4837         }
4838         if (stcb->asoc.pktdrop_supported == 1) {
4839                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4840         }
4841         if (num_ext > 0) {
4842                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4843                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4844                 pr_supported->ph.param_length = htons(parameter_len);
4845                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4846                 chunk_len += parameter_len;
4847         }
4848         /* add authentication parameters */
4849         if (stcb->asoc.auth_supported) {
4850                 /* attach RANDOM parameter, if available */
4851                 if (stcb->asoc.authinfo.random != NULL) {
4852                         struct sctp_auth_random *randp;
4853
4854                         if (padding_len > 0) {
4855                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4856                                 chunk_len += padding_len;
4857                                 padding_len = 0;
4858                         }
4859                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4860                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4861                         /* random key already contains the header */
4862                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4863                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4864                         chunk_len += parameter_len;
4865                 }
4866                 /* add HMAC_ALGO parameter */
4867                 if (stcb->asoc.local_hmacs != NULL) {
4868                         struct sctp_auth_hmac_algo *hmacs;
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                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4876                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4877                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4878                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4879                         hmacs->ph.param_length = htons(parameter_len);
4880                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4881                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4882                         chunk_len += parameter_len;
4883                 }
4884                 /* add CHUNKS parameter */
4885                 if (stcb->asoc.local_auth_chunks != NULL) {
4886                         struct sctp_auth_chunk_list *chunks;
4887
4888                         if (padding_len > 0) {
4889                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4890                                 chunk_len += padding_len;
4891                                 padding_len = 0;
4892                         }
4893                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4894                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4895                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4896                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4897                         chunks->ph.param_length = htons(parameter_len);
4898                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4899                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4900                         chunk_len += parameter_len;
4901                 }
4902         }
4903         /* now any cookie time extensions */
4904         if (stcb->asoc.cookie_preserve_req) {
4905                 struct sctp_cookie_perserve_param *cookie_preserve;
4906
4907                 if (padding_len > 0) {
4908                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4909                         chunk_len += padding_len;
4910                         padding_len = 0;
4911                 }
4912                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4913                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4914                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4915                 cookie_preserve->ph.param_length = htons(parameter_len);
4916                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4917                 stcb->asoc.cookie_preserve_req = 0;
4918                 chunk_len += parameter_len;
4919         }
4920         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4921                 uint8_t i;
4922
4923                 if (padding_len > 0) {
4924                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4925                         chunk_len += padding_len;
4926                         padding_len = 0;
4927                 }
4928                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4929                 if (stcb->asoc.scope.ipv4_addr_legal) {
4930                         parameter_len += (uint16_t) sizeof(uint16_t);
4931                 }
4932                 if (stcb->asoc.scope.ipv6_addr_legal) {
4933                         parameter_len += (uint16_t) sizeof(uint16_t);
4934                 }
4935                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4936                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4937                 sup_addr->ph.param_length = htons(parameter_len);
4938                 i = 0;
4939                 if (stcb->asoc.scope.ipv4_addr_legal) {
4940                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4941                 }
4942                 if (stcb->asoc.scope.ipv6_addr_legal) {
4943                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4944                 }
4945                 padding_len = 4 - 2 * i;
4946                 chunk_len += parameter_len;
4947         }
4948         SCTP_BUF_LEN(m) = chunk_len;
4949         /* now the addresses */
4950         /*
4951          * To optimize this we could put the scoping stuff into a structure
4952          * and remove the individual uint8's from the assoc structure. Then
4953          * we could just sifa in the address within the stcb. But for now
4954          * this is a quick hack to get the address stuff teased apart.
4955          */
4956         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4957             m, cnt_inits_to,
4958             &padding_len, &chunk_len);
4959
4960         init->ch.chunk_length = htons(chunk_len);
4961         if (padding_len > 0) {
4962                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4963                         sctp_m_freem(m);
4964                         return;
4965                 }
4966         }
4967         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4968         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4969             (struct sockaddr *)&net->ro._l_addr,
4970             m, 0, NULL, 0, 0, 0, 0,
4971             inp->sctp_lport, stcb->rport, htonl(0),
4972             net->port, NULL,
4973             0, 0,
4974             so_locked);
4975         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4976         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4977         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4978 }
4979
4980 struct mbuf *
4981 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4982     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4983 {
4984         /*
4985          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4986          * being equal to the beginning of the params i.e. (iphlen +
4987          * sizeof(struct sctp_init_msg) parse through the parameters to the
4988          * end of the mbuf verifying that all parameters are known.
4989          *
4990          * For unknown parameters build and return a mbuf with
4991          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4992          * processing this chunk stop, and set *abort_processing to 1.
4993          *
4994          * By having param_offset be pre-set to where parameters begin it is
4995          * hoped that this routine may be reused in the future by new
4996          * features.
4997          */
4998         struct sctp_paramhdr *phdr, params;
4999
5000         struct mbuf *mat, *op_err;
5001         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
5002         int at, limit, pad_needed;
5003         uint16_t ptype, plen, padded_size;
5004         int err_at;
5005
5006         *abort_processing = 0;
5007         mat = in_initpkt;
5008         err_at = 0;
5009         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5010         at = param_offset;
5011         op_err = NULL;
5012         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5013         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5014         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5015                 ptype = ntohs(phdr->param_type);
5016                 plen = ntohs(phdr->param_length);
5017                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5018                         /* wacked parameter */
5019                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5020                         goto invalid_size;
5021                 }
5022                 limit -= SCTP_SIZE32(plen);
5023                 /*-
5024                  * All parameters for all chunks that we know/understand are
5025                  * listed here. We process them other places and make
5026                  * appropriate stop actions per the upper bits. However this
5027                  * is the generic routine processor's can call to get back
5028                  * an operr.. to either incorporate (init-ack) or send.
5029                  */
5030                 padded_size = SCTP_SIZE32(plen);
5031                 switch (ptype) {
5032                         /* Param's with variable size */
5033                 case SCTP_HEARTBEAT_INFO:
5034                 case SCTP_STATE_COOKIE:
5035                 case SCTP_UNRECOG_PARAM:
5036                 case SCTP_ERROR_CAUSE_IND:
5037                         /* ok skip fwd */
5038                         at += padded_size;
5039                         break;
5040                         /* Param's with variable size within a range */
5041                 case SCTP_CHUNK_LIST:
5042                 case SCTP_SUPPORTED_CHUNK_EXT:
5043                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5044                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5045                                 goto invalid_size;
5046                         }
5047                         at += padded_size;
5048                         break;
5049                 case SCTP_SUPPORTED_ADDRTYPE:
5050                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5052                                 goto invalid_size;
5053                         }
5054                         at += padded_size;
5055                         break;
5056                 case SCTP_RANDOM:
5057                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                 case SCTP_SET_PRIM_ADDR:
5064                 case SCTP_DEL_IP_ADDRESS:
5065                 case SCTP_ADD_IP_ADDRESS:
5066                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5067                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5068                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5069                                 goto invalid_size;
5070                         }
5071                         at += padded_size;
5072                         break;
5073                         /* Param's with a fixed size */
5074                 case SCTP_IPV4_ADDRESS:
5075                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5076                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5077                                 goto invalid_size;
5078                         }
5079                         at += padded_size;
5080                         break;
5081                 case SCTP_IPV6_ADDRESS:
5082                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5084                                 goto invalid_size;
5085                         }
5086                         at += padded_size;
5087                         break;
5088                 case SCTP_COOKIE_PRESERVE:
5089                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_HAS_NAT_SUPPORT:
5096                         *nat_friendly = 1;
5097                         /* fall through */
5098                 case SCTP_PRSCTP_SUPPORTED:
5099                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5100                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5101                                 goto invalid_size;
5102                         }
5103                         at += padded_size;
5104                         break;
5105                 case SCTP_ECN_CAPABLE:
5106                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5107                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5108                                 goto invalid_size;
5109                         }
5110                         at += padded_size;
5111                         break;
5112                 case SCTP_ULP_ADAPTATION:
5113                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5114                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5115                                 goto invalid_size;
5116                         }
5117                         at += padded_size;
5118                         break;
5119                 case SCTP_SUCCESS_REPORT:
5120                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5121                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5122                                 goto invalid_size;
5123                         }
5124                         at += padded_size;
5125                         break;
5126                 case SCTP_HOSTNAME_ADDRESS:
5127                         {
5128                                 /* We can NOT handle HOST NAME addresses!! */
5129                                 int l_len;
5130
5131                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5132                                 *abort_processing = 1;
5133                                 if (op_err == NULL) {
5134                                         /* Ok need to try to get a mbuf */
5135 #ifdef INET6
5136                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5137 #else
5138                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5139 #endif
5140                                         l_len += plen;
5141                                         l_len += sizeof(struct sctp_paramhdr);
5142                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5143                                         if (op_err) {
5144                                                 SCTP_BUF_LEN(op_err) = 0;
5145                                                 /*
5146                                                  * pre-reserve space for ip
5147                                                  * and sctp header  and
5148                                                  * chunk hdr
5149                                                  */
5150 #ifdef INET6
5151                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5152 #else
5153                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5154 #endif
5155                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5156                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5157                                         }
5158                                 }
5159                                 if (op_err) {
5160                                         /* If we have space */
5161                                         struct sctp_paramhdr s;
5162
5163                                         if (err_at % 4) {
5164                                                 uint32_t cpthis = 0;
5165
5166                                                 pad_needed = 4 - (err_at % 4);
5167                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5168                                                 err_at += pad_needed;
5169                                         }
5170                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5171                                         s.param_length = htons(sizeof(s) + plen);
5172                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5173                                         err_at += sizeof(s);
5174                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5175                                         if (phdr == NULL) {
5176                                                 sctp_m_freem(op_err);
5177                                                 /*
5178                                                  * we are out of memory but
5179                                                  * we still need to have a
5180                                                  * look at what to do (the
5181                                                  * system is in trouble
5182                                                  * though).
5183                                                  */
5184                                                 return (NULL);
5185                                         }
5186                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5187                                 }
5188                                 return (op_err);
5189                                 break;
5190                         }
5191                 default:
5192                         /*
5193                          * we do not recognize the parameter figure out what
5194                          * we do.
5195                          */
5196                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5197                         if ((ptype & 0x4000) == 0x4000) {
5198                                 /* Report bit is set?? */
5199                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5200                                 if (op_err == NULL) {
5201                                         int l_len;
5202
5203                                         /* Ok need to try to get an mbuf */
5204 #ifdef INET6
5205                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5206 #else
5207                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5208 #endif
5209                                         l_len += plen;
5210                                         l_len += sizeof(struct sctp_paramhdr);
5211                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5212                                         if (op_err) {
5213                                                 SCTP_BUF_LEN(op_err) = 0;
5214 #ifdef INET6
5215                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5216 #else
5217                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5218 #endif
5219                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5220                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5221                                         }
5222                                 }
5223                                 if (op_err) {
5224                                         /* If we have space */
5225                                         struct sctp_paramhdr s;
5226
5227                                         if (err_at % 4) {
5228                                                 uint32_t cpthis = 0;
5229
5230                                                 pad_needed = 4 - (err_at % 4);
5231                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5232                                                 err_at += pad_needed;
5233                                         }
5234                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5235                                         s.param_length = htons(sizeof(s) + plen);
5236                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5237                                         err_at += sizeof(s);
5238                                         if (plen > sizeof(tempbuf)) {
5239                                                 plen = sizeof(tempbuf);
5240                                         }
5241                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5242                                         if (phdr == NULL) {
5243                                                 sctp_m_freem(op_err);
5244                                                 /*
5245                                                  * we are out of memory but
5246                                                  * we still need to have a
5247                                                  * look at what to do (the
5248                                                  * system is in trouble
5249                                                  * though).
5250                                                  */
5251                                                 op_err = NULL;
5252                                                 goto more_processing;
5253                                         }
5254                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5255                                         err_at += plen;
5256                                 }
5257                         }
5258         more_processing:
5259                         if ((ptype & 0x8000) == 0x0000) {
5260                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5261                                 return (op_err);
5262                         } else {
5263                                 /* skip this chunk and continue processing */
5264                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5265                                 at += SCTP_SIZE32(plen);
5266                         }
5267                         break;
5268
5269                 }
5270                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5271         }
5272         return (op_err);
5273 invalid_size:
5274         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5275         *abort_processing = 1;
5276         if ((op_err == NULL) && phdr) {
5277                 int l_len;
5278
5279 #ifdef INET6
5280                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5281 #else
5282                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5283 #endif
5284                 l_len += (2 * sizeof(struct sctp_paramhdr));
5285                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5286                 if (op_err) {
5287                         SCTP_BUF_LEN(op_err) = 0;
5288 #ifdef INET6
5289                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5290 #else
5291                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5292 #endif
5293                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5294                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5295                 }
5296         }
5297         if ((op_err) && phdr) {
5298                 struct sctp_paramhdr s;
5299
5300                 if (err_at % 4) {
5301                         uint32_t cpthis = 0;
5302
5303                         pad_needed = 4 - (err_at % 4);
5304                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5305                         err_at += pad_needed;
5306                 }
5307                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5308                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5309                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5310                 err_at += sizeof(s);
5311                 /* Only copy back the p-hdr that caused the issue */
5312                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5313         }
5314         return (op_err);
5315 }
5316
5317 static int
5318 sctp_are_there_new_addresses(struct sctp_association *asoc,
5319     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5320 {
5321         /*
5322          * Given a INIT packet, look through the packet to verify that there
5323          * are NO new addresses. As we go through the parameters add reports
5324          * of any un-understood parameters that require an error.  Also we
5325          * must return (1) to drop the packet if we see a un-understood
5326          * parameter that tells us to drop the chunk.
5327          */
5328         struct sockaddr *sa_touse;
5329         struct sockaddr *sa;
5330         struct sctp_paramhdr *phdr, params;
5331         uint16_t ptype, plen;
5332         uint8_t fnd;
5333         struct sctp_nets *net;
5334
5335 #ifdef INET
5336         struct sockaddr_in sin4, *sa4;
5337
5338 #endif
5339 #ifdef INET6
5340         struct sockaddr_in6 sin6, *sa6;
5341
5342 #endif
5343
5344 #ifdef INET
5345         memset(&sin4, 0, sizeof(sin4));
5346         sin4.sin_family = AF_INET;
5347         sin4.sin_len = sizeof(sin4);
5348 #endif
5349 #ifdef INET6
5350         memset(&sin6, 0, sizeof(sin6));
5351         sin6.sin6_family = AF_INET6;
5352         sin6.sin6_len = sizeof(sin6);
5353 #endif
5354         /* First what about the src address of the pkt ? */
5355         fnd = 0;
5356         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5357                 sa = (struct sockaddr *)&net->ro._l_addr;
5358                 if (sa->sa_family == src->sa_family) {
5359 #ifdef INET
5360                         if (sa->sa_family == AF_INET) {
5361                                 struct sockaddr_in *src4;
5362
5363                                 sa4 = (struct sockaddr_in *)sa;
5364                                 src4 = (struct sockaddr_in *)src;
5365                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5366                                         fnd = 1;
5367                                         break;
5368                                 }
5369                         }
5370 #endif
5371 #ifdef INET6
5372                         if (sa->sa_family == AF_INET6) {
5373                                 struct sockaddr_in6 *src6;
5374
5375                                 sa6 = (struct sockaddr_in6 *)sa;
5376                                 src6 = (struct sockaddr_in6 *)src;
5377                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5378                                         fnd = 1;
5379                                         break;
5380                                 }
5381                         }
5382 #endif
5383                 }
5384         }
5385         if (fnd == 0) {
5386                 /* New address added! no need to look futher. */
5387                 return (1);
5388         }
5389         /* Ok so far lets munge through the rest of the packet */
5390         offset += sizeof(struct sctp_init_chunk);
5391         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5392         while (phdr) {
5393                 sa_touse = NULL;
5394                 ptype = ntohs(phdr->param_type);
5395                 plen = ntohs(phdr->param_length);
5396                 switch (ptype) {
5397 #ifdef INET
5398                 case SCTP_IPV4_ADDRESS:
5399                         {
5400                                 struct sctp_ipv4addr_param *p4, p4_buf;
5401
5402                                 phdr = sctp_get_next_param(in_initpkt, offset,
5403                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5404                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5405                                     phdr == NULL) {
5406                                         return (1);
5407                                 }
5408                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5409                                 sin4.sin_addr.s_addr = p4->addr;
5410                                 sa_touse = (struct sockaddr *)&sin4;
5411                                 break;
5412                         }
5413 #endif
5414 #ifdef INET6
5415                 case SCTP_IPV6_ADDRESS:
5416                         {
5417                                 struct sctp_ipv6addr_param *p6, p6_buf;
5418
5419                                 phdr = sctp_get_next_param(in_initpkt, offset,
5420                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5421                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5422                                     phdr == NULL) {
5423                                         return (1);
5424                                 }
5425                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5426                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5427                                     sizeof(p6->addr));
5428                                 sa_touse = (struct sockaddr *)&sin6;
5429                                 break;
5430                         }
5431 #endif
5432                 default:
5433                         sa_touse = NULL;
5434                         break;
5435                 }
5436                 if (sa_touse) {
5437                         /* ok, sa_touse points to one to check */
5438                         fnd = 0;
5439                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5440                                 sa = (struct sockaddr *)&net->ro._l_addr;
5441                                 if (sa->sa_family != sa_touse->sa_family) {
5442                                         continue;
5443                                 }
5444 #ifdef INET
5445                                 if (sa->sa_family == AF_INET) {
5446                                         sa4 = (struct sockaddr_in *)sa;
5447                                         if (sa4->sin_addr.s_addr ==
5448                                             sin4.sin_addr.s_addr) {
5449                                                 fnd = 1;
5450                                                 break;
5451                                         }
5452                                 }
5453 #endif
5454 #ifdef INET6
5455                                 if (sa->sa_family == AF_INET6) {
5456                                         sa6 = (struct sockaddr_in6 *)sa;
5457                                         if (SCTP6_ARE_ADDR_EQUAL(
5458                                             sa6, &sin6)) {
5459                                                 fnd = 1;
5460                                                 break;
5461                                         }
5462                                 }
5463 #endif
5464                         }
5465                         if (!fnd) {
5466                                 /* New addr added! no need to look further */
5467                                 return (1);
5468                         }
5469                 }
5470                 offset += SCTP_SIZE32(plen);
5471                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5472         }
5473         return (0);
5474 }
5475
5476 /*
5477  * Given a MBUF chain that was sent into us containing an INIT. Build a
5478  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5479  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5480  * message (i.e. the struct sctp_init_msg).
5481  */
5482 void
5483 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5484     struct mbuf *init_pkt, int iphlen, int offset,
5485     struct sockaddr *src, struct sockaddr *dst,
5486     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5487     uint8_t use_mflowid, uint32_t mflowid,
5488     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5489 {
5490         struct sctp_association *asoc;
5491         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5492         struct sctp_init_ack_chunk *initack;
5493         struct sctp_adaptation_layer_indication *ali;
5494         struct sctp_supported_chunk_types_param *pr_supported;
5495         struct sctp_paramhdr *ph;
5496         union sctp_sockstore *over_addr;
5497         struct sctp_scoping scp;
5498
5499 #ifdef INET
5500         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5501         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5502         struct sockaddr_in *sin;
5503
5504 #endif
5505 #ifdef INET6
5506         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5507         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5508         struct sockaddr_in6 *sin6;
5509
5510 #endif
5511         struct sockaddr *to;
5512         struct sctp_state_cookie stc;
5513         struct sctp_nets *net = NULL;
5514         uint8_t *signature = NULL;
5515         int cnt_inits_to = 0;
5516         uint16_t his_limit, i_want;
5517         int abort_flag;
5518         int nat_friendly = 0;
5519         struct socket *so;
5520         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5521
5522         if (stcb) {
5523                 asoc = &stcb->asoc;
5524         } else {
5525                 asoc = NULL;
5526         }
5527         if ((asoc != NULL) &&
5528             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5529             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5530                 /* new addresses, out of here in non-cookie-wait states */
5531                 /*
5532                  * Send a ABORT, we don't add the new address error clause
5533                  * though we even set the T bit and copy in the 0 tag.. this
5534                  * looks no different than if no listener was present.
5535                  */
5536                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5537                     "Address added");
5538                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5539                     use_mflowid, mflowid,
5540                     vrf_id, port);
5541                 return;
5542         }
5543         abort_flag = 0;
5544         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5545             (offset + sizeof(struct sctp_init_chunk)),
5546             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5547         if (abort_flag) {
5548 do_a_abort:
5549                 if (op_err == NULL) {
5550                         char msg[SCTP_DIAG_INFO_LEN];
5551
5552                         snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5553                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5554                             msg);
5555                 }
5556                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5557                     init_chk->init.initiate_tag, op_err,
5558                     use_mflowid, mflowid,
5559                     vrf_id, port);
5560                 return;
5561         }
5562         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5563         if (m == NULL) {
5564                 /* No memory, INIT timer will re-attempt. */
5565                 if (op_err)
5566                         sctp_m_freem(op_err);
5567                 return;
5568         }
5569         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5570         padding_len = 0;
5571
5572         /*
5573          * We might not overwrite the identification[] completely and on
5574          * some platforms time_entered will contain some padding. Therefore
5575          * zero out the cookie to avoid putting uninitialized memory on the
5576          * wire.
5577          */
5578         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5579
5580         /* the time I built cookie */
5581         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5582
5583         /* populate any tie tags */
5584         if (asoc != NULL) {
5585                 /* unlock before tag selections */
5586                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5587                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5588                 stc.cookie_life = asoc->cookie_life;
5589                 net = asoc->primary_destination;
5590         } else {
5591                 stc.tie_tag_my_vtag = 0;
5592                 stc.tie_tag_peer_vtag = 0;
5593                 /* life I will award this cookie */
5594                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5595         }
5596
5597         /* copy in the ports for later check */
5598         stc.myport = sh->dest_port;
5599         stc.peerport = sh->src_port;
5600
5601         /*
5602          * If we wanted to honor cookie life extentions, we would add to
5603          * stc.cookie_life. For now we should NOT honor any extension
5604          */
5605         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5606         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5607                 stc.ipv6_addr_legal = 1;
5608                 if (SCTP_IPV6_V6ONLY(inp)) {
5609                         stc.ipv4_addr_legal = 0;
5610                 } else {
5611                         stc.ipv4_addr_legal = 1;
5612                 }
5613         } else {
5614                 stc.ipv6_addr_legal = 0;
5615                 stc.ipv4_addr_legal = 1;
5616         }
5617 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5618         stc.ipv4_scope = 1;
5619 #else
5620         stc.ipv4_scope = 0;
5621 #endif
5622         if (net == NULL) {
5623                 to = src;
5624                 switch (dst->sa_family) {
5625 #ifdef INET
5626                 case AF_INET:
5627                         {
5628                                 /* lookup address */
5629                                 stc.address[0] = src4->sin_addr.s_addr;
5630                                 stc.address[1] = 0;
5631                                 stc.address[2] = 0;
5632                                 stc.address[3] = 0;
5633                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5634                                 /* local from address */
5635                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5636                                 stc.laddress[1] = 0;
5637                                 stc.laddress[2] = 0;
5638                                 stc.laddress[3] = 0;
5639                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5640                                 /* scope_id is only for v6 */
5641                                 stc.scope_id = 0;
5642 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5643                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5644                                         stc.ipv4_scope = 1;
5645                                 }
5646 #else
5647                                 stc.ipv4_scope = 1;
5648 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5649                                 /* Must use the address in this case */
5650                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5651                                         stc.loopback_scope = 1;
5652                                         stc.ipv4_scope = 1;
5653                                         stc.site_scope = 1;
5654                                         stc.local_scope = 0;
5655                                 }
5656                                 break;
5657                         }
5658 #endif
5659 #ifdef INET6
5660                 case AF_INET6:
5661                         {
5662                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5663                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5664                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5665                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5666                                         stc.loopback_scope = 1;
5667                                         stc.local_scope = 0;
5668                                         stc.site_scope = 1;
5669                                         stc.ipv4_scope = 1;
5670                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5671                                         /*
5672                                          * If the new destination is a
5673                                          * LINK_LOCAL we must have common
5674                                          * both site and local scope. Don't
5675                                          * set local scope though since we
5676                                          * must depend on the source to be
5677                                          * added implicitly. We cannot
5678                                          * assure just because we share one
5679                                          * link that all links are common.
5680                                          */
5681                                         stc.local_scope = 0;
5682                                         stc.site_scope = 1;
5683                                         stc.ipv4_scope = 1;
5684                                         /*
5685                                          * we start counting for the private
5686                                          * address stuff at 1. since the
5687                                          * link local we source from won't
5688                                          * show up in our scoped count.
5689                                          */
5690                                         cnt_inits_to = 1;
5691                                         /*
5692                                          * pull out the scope_id from
5693                                          * incoming pkt
5694                                          */
5695                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5696                                         /*
5697                                          * If the new destination is
5698                                          * SITE_LOCAL then we must have site
5699                                          * scope in common.
5700                                          */
5701                                         stc.site_scope = 1;
5702                                 }
5703                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5704                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5705                                 break;
5706                         }
5707 #endif
5708                 default:
5709                         /* TSNH */
5710                         goto do_a_abort;
5711                         break;
5712                 }
5713         } else {
5714                 /* set the scope per the existing tcb */
5715
5716 #ifdef INET6
5717                 struct sctp_nets *lnet;
5718
5719 #endif
5720
5721                 stc.loopback_scope = asoc->scope.loopback_scope;
5722                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5723                 stc.site_scope = asoc->scope.site_scope;
5724                 stc.local_scope = asoc->scope.local_scope;
5725 #ifdef INET6
5726                 /* Why do we not consider IPv4 LL addresses? */
5727                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5728                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5729                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5730                                         /*
5731                                          * if we have a LL address, start
5732                                          * counting at 1.
5733                                          */
5734                                         cnt_inits_to = 1;
5735                                 }
5736                         }
5737                 }
5738 #endif
5739                 /* use the net pointer */
5740                 to = (struct sockaddr *)&net->ro._l_addr;
5741                 switch (to->sa_family) {
5742 #ifdef INET
5743                 case AF_INET:
5744                         sin = (struct sockaddr_in *)to;
5745                         stc.address[0] = sin->sin_addr.s_addr;
5746                         stc.address[1] = 0;
5747                         stc.address[2] = 0;
5748                         stc.address[3] = 0;
5749                         stc.addr_type = SCTP_IPV4_ADDRESS;
5750                         if (net->src_addr_selected == 0) {
5751                                 /*
5752                                  * strange case here, the INIT should have
5753                                  * did the selection.
5754                                  */
5755                                 net->ro._s_addr = sctp_source_address_selection(inp,
5756                                     stcb, (sctp_route_t *) & net->ro,
5757                                     net, 0, vrf_id);
5758                                 if (net->ro._s_addr == NULL)
5759                                         return;
5760
5761                                 net->src_addr_selected = 1;
5762
5763                         }
5764                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5765                         stc.laddress[1] = 0;
5766                         stc.laddress[2] = 0;
5767                         stc.laddress[3] = 0;
5768                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5769                         /* scope_id is only for v6 */
5770                         stc.scope_id = 0;
5771                         break;
5772 #endif
5773 #ifdef INET6
5774                 case AF_INET6:
5775                         sin6 = (struct sockaddr_in6 *)to;
5776                         memcpy(&stc.address, &sin6->sin6_addr,
5777                             sizeof(struct in6_addr));
5778                         stc.addr_type = SCTP_IPV6_ADDRESS;
5779                         stc.scope_id = sin6->sin6_scope_id;
5780                         if (net->src_addr_selected == 0) {
5781                                 /*
5782                                  * strange case here, the INIT should have
5783                                  * done the selection.
5784                                  */
5785                                 net->ro._s_addr = sctp_source_address_selection(inp,
5786                                     stcb, (sctp_route_t *) & net->ro,
5787                                     net, 0, vrf_id);
5788                                 if (net->ro._s_addr == NULL)
5789                                         return;
5790
5791                                 net->src_addr_selected = 1;
5792                         }
5793                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5794                             sizeof(struct in6_addr));
5795                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5796                         break;
5797 #endif
5798                 }
5799         }
5800         /* Now lets put the SCTP header in place */
5801         initack = mtod(m, struct sctp_init_ack_chunk *);
5802         /* Save it off for quick ref */
5803         stc.peers_vtag = init_chk->init.initiate_tag;
5804         /* who are we */
5805         memcpy(stc.identification, SCTP_VERSION_STRING,
5806             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5807         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5808         /* now the chunk header */
5809         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5810         initack->ch.chunk_flags = 0;
5811         /* fill in later from mbuf we build */
5812         initack->ch.chunk_length = 0;
5813         /* place in my tag */
5814         if ((asoc != NULL) &&
5815             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5816             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5817             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5818                 /* re-use the v-tags and init-seq here */
5819                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5820                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5821         } else {
5822                 uint32_t vtag, itsn;
5823
5824                 if (hold_inp_lock) {
5825                         SCTP_INP_INCR_REF(inp);
5826                         SCTP_INP_RUNLOCK(inp);
5827                 }
5828                 if (asoc) {
5829                         atomic_add_int(&asoc->refcnt, 1);
5830                         SCTP_TCB_UNLOCK(stcb);
5831         new_tag:
5832                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5833                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5834                                 /*
5835                                  * Got a duplicate vtag on some guy behind a
5836                                  * nat make sure we don't use it.
5837                                  */
5838                                 goto new_tag;
5839                         }
5840                         initack->init.initiate_tag = htonl(vtag);
5841                         /* get a TSN to use too */
5842                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5843                         initack->init.initial_tsn = htonl(itsn);
5844                         SCTP_TCB_LOCK(stcb);
5845                         atomic_add_int(&asoc->refcnt, -1);
5846                 } else {
5847                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848                         initack->init.initiate_tag = htonl(vtag);
5849                         /* get a TSN to use too */
5850                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5851                 }
5852                 if (hold_inp_lock) {
5853                         SCTP_INP_RLOCK(inp);
5854                         SCTP_INP_DECR_REF(inp);
5855                 }
5856         }
5857         /* save away my tag to */
5858         stc.my_vtag = initack->init.initiate_tag;
5859
5860         /* set up some of the credits. */
5861         so = inp->sctp_socket;
5862         if (so == NULL) {
5863                 /* memory problem */
5864                 sctp_m_freem(m);
5865                 return;
5866         } else {
5867                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5868         }
5869         /* set what I want */
5870         his_limit = ntohs(init_chk->init.num_inbound_streams);
5871         /* choose what I want */
5872         if (asoc != NULL) {
5873                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5874                         i_want = asoc->streamoutcnt;
5875                 } else {
5876                         i_want = inp->sctp_ep.pre_open_stream_count;
5877                 }
5878         } else {
5879                 i_want = inp->sctp_ep.pre_open_stream_count;
5880         }
5881         if (his_limit < i_want) {
5882                 /* I Want more :< */
5883                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5884         } else {
5885                 /* I can have what I want :> */
5886                 initack->init.num_outbound_streams = htons(i_want);
5887         }
5888         /* tell him his limit. */
5889         initack->init.num_inbound_streams =
5890             htons(inp->sctp_ep.max_open_streams_intome);
5891
5892         /* adaptation layer indication parameter */
5893         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5894                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5895                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5896                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5897                 ali->ph.param_length = htons(parameter_len);
5898                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5899                 chunk_len += parameter_len;
5900         }
5901         /* ECN parameter */
5902         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5903             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5904                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5905                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5906                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5907                 ph->param_length = htons(parameter_len);
5908                 chunk_len += parameter_len;
5909         }
5910         /* PR-SCTP supported parameter */
5911         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5912             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5913                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5914                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5915                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5916                 ph->param_length = htons(parameter_len);
5917                 chunk_len += parameter_len;
5918         }
5919         /* Add NAT friendly parameter */
5920         if (nat_friendly) {
5921                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5922                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5923                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5924                 ph->param_length = htons(parameter_len);
5925                 chunk_len += parameter_len;
5926         }
5927         /* And now tell the peer which extensions we support */
5928         num_ext = 0;
5929         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5930         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5931             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5932                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5933         }
5934         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5935             ((asoc == NULL) && (inp->auth_supported == 1))) {
5936                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5937         }
5938         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5939             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5940                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5941                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5942         }
5943         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5944             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5945                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5946         }
5947         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5948             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5949                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5950         }
5951         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5952             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5953                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5954         }
5955         if (num_ext > 0) {
5956                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5957                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5958                 pr_supported->ph.param_length = htons(parameter_len);
5959                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5960                 chunk_len += parameter_len;
5961         }
5962         /* add authentication parameters */
5963         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5964             ((asoc == NULL) && (inp->auth_supported == 1))) {
5965                 struct sctp_auth_random *randp;
5966                 struct sctp_auth_hmac_algo *hmacs;
5967                 struct sctp_auth_chunk_list *chunks;
5968
5969                 if (padding_len > 0) {
5970                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5971                         chunk_len += padding_len;
5972                         padding_len = 0;
5973                 }
5974                 /* generate and add RANDOM parameter */
5975                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5976                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5977                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5978                 randp->ph.param_type = htons(SCTP_RANDOM);
5979                 randp->ph.param_length = htons(parameter_len);
5980                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5981                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5982                 chunk_len += parameter_len;
5983
5984                 if (padding_len > 0) {
5985                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5986                         chunk_len += padding_len;
5987                         padding_len = 0;
5988                 }
5989                 /* add HMAC_ALGO parameter */
5990                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5991                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5992                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5993                     (uint8_t *) hmacs->hmac_ids);
5994                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5995                 hmacs->ph.param_length = htons(parameter_len);
5996                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5997                 chunk_len += parameter_len;
5998
5999                 if (padding_len > 0) {
6000                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6001                         chunk_len += padding_len;
6002                         padding_len = 0;
6003                 }
6004                 /* add CHUNKS parameter */
6005                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6006                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6007                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6008                     chunks->chunk_types);
6009                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6010                 chunks->ph.param_length = htons(parameter_len);
6011                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6012                 chunk_len += parameter_len;
6013         }
6014         SCTP_BUF_LEN(m) = chunk_len;
6015         m_last = m;
6016         /* now the addresses */
6017         /*
6018          * To optimize this we could put the scoping stuff into a structure
6019          * and remove the individual uint8's from the stc structure. Then we
6020          * could just sifa in the address within the stc.. but for now this
6021          * is a quick hack to get the address stuff teased apart.
6022          */
6023         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6024         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6025         scp.loopback_scope = stc.loopback_scope;
6026         scp.ipv4_local_scope = stc.ipv4_scope;
6027         scp.local_scope = stc.local_scope;
6028         scp.site_scope = stc.site_scope;
6029         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6030             cnt_inits_to,
6031             &padding_len, &chunk_len);
6032         /* padding_len can only be positive, if no addresses have been added */
6033         if (padding_len > 0) {
6034                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6035                 chunk_len += padding_len;
6036                 SCTP_BUF_LEN(m) += padding_len;
6037                 padding_len = 0;
6038         }
6039         /* tack on the operational error if present */
6040         if (op_err) {
6041                 parameter_len = 0;
6042                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6043                         parameter_len += SCTP_BUF_LEN(m_tmp);
6044                 }
6045                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6046                 SCTP_BUF_NEXT(m_last) = op_err;
6047                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6048                         m_last = SCTP_BUF_NEXT(m_last);
6049                 }
6050                 chunk_len += parameter_len;
6051         }
6052         if (padding_len > 0) {
6053                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6054                 if (m_last == NULL) {
6055                         /* Houston we have a problem, no space */
6056                         sctp_m_freem(m);
6057                         return;
6058                 }
6059                 chunk_len += padding_len;
6060                 padding_len = 0;
6061         }
6062         /* Now we must build a cookie */
6063         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6064         if (m_cookie == NULL) {
6065                 /* memory problem */
6066                 sctp_m_freem(m);
6067                 return;
6068         }
6069         /* Now append the cookie to the end and update the space/size */
6070         SCTP_BUF_NEXT(m_last) = m_cookie;
6071         parameter_len = 0;
6072         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6073                 parameter_len += SCTP_BUF_LEN(m_tmp);
6074                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6075                         m_last = m_tmp;
6076                 }
6077         }
6078         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6079         chunk_len += parameter_len;
6080
6081         /*
6082          * Place in the size, but we don't include the last pad (if any) in
6083          * the INIT-ACK.
6084          */
6085         initack->ch.chunk_length = htons(chunk_len);
6086
6087         /*
6088          * Time to sign the cookie, we don't sign over the cookie signature
6089          * though thus we set trailer.
6090          */
6091         (void)sctp_hmac_m(SCTP_HMAC,
6092             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6093             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6094             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6095         /*
6096          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6097          * here since the timer will drive a retranmission.
6098          */
6099         if (padding_len > 0) {
6100                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6101                         sctp_m_freem(m);
6102                         return;
6103                 }
6104         }
6105         if (stc.loopback_scope) {
6106                 over_addr = (union sctp_sockstore *)dst;
6107         } else {
6108                 over_addr = NULL;
6109         }
6110
6111         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6112             0, 0,
6113             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6114             port, over_addr,
6115             use_mflowid, mflowid,
6116             SCTP_SO_NOT_LOCKED);
6117         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6118 }
6119
6120
6121 static void
6122 sctp_prune_prsctp(struct sctp_tcb *stcb,
6123     struct sctp_association *asoc,
6124     struct sctp_sndrcvinfo *srcv,
6125     int dataout)
6126 {
6127         int freed_spc = 0;
6128         struct sctp_tmit_chunk *chk, *nchk;
6129
6130         SCTP_TCB_LOCK_ASSERT(stcb);
6131         if ((asoc->prsctp_supported) &&
6132             (asoc->sent_queue_cnt_removeable > 0)) {
6133                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6134                         /*
6135                          * Look for chunks marked with the PR_SCTP flag AND
6136                          * the buffer space flag. If the one being sent is
6137                          * equal or greater priority then purge the old one
6138                          * and free some space.
6139                          */
6140                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6141                                 /*
6142                                  * This one is PR-SCTP AND buffer space
6143                                  * limited type
6144                                  */
6145                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6146                                         /*
6147                                          * Lower numbers equates to higher
6148                                          * priority so if the one we are
6149                                          * looking at has a larger or equal
6150                                          * priority we want to drop the data
6151                                          * and NOT retransmit it.
6152                                          */
6153                                         if (chk->data) {
6154                                                 /*
6155                                                  * We release the book_size
6156                                                  * if the mbuf is here
6157                                                  */
6158                                                 int ret_spc;
6159                                                 uint8_t sent;
6160
6161                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6162                                                         sent = 1;
6163                                                 else
6164                                                         sent = 0;
6165                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6166                                                     sent,
6167                                                     SCTP_SO_LOCKED);
6168                                                 freed_spc += ret_spc;
6169                                                 if (freed_spc >= dataout) {
6170                                                         return;
6171                                                 }
6172                                         }       /* if chunk was present */
6173                                 }       /* if of sufficent priority */
6174                         }       /* if chunk has enabled */
6175                 }               /* tailqforeach */
6176
6177                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6178                         /* Here we must move to the sent queue and mark */
6179                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6180                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6181                                         if (chk->data) {
6182                                                 /*
6183                                                  * We release the book_size
6184                                                  * if the mbuf is here
6185                                                  */
6186                                                 int ret_spc;
6187
6188                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6189                                                     0, SCTP_SO_LOCKED);
6190
6191                                                 freed_spc += ret_spc;
6192                                                 if (freed_spc >= dataout) {
6193                                                         return;
6194                                                 }
6195                                         }       /* end if chk->data */
6196                                 }       /* end if right class */
6197                         }       /* end if chk pr-sctp */
6198                 }               /* tailqforeachsafe (chk) */
6199         }                       /* if enabled in asoc */
6200 }
6201
6202 int
6203 sctp_get_frag_point(struct sctp_tcb *stcb,
6204     struct sctp_association *asoc)
6205 {
6206         int siz, ovh;
6207
6208         /*
6209          * For endpoints that have both v6 and v4 addresses we must reserve
6210          * room for the ipv6 header, for those that are only dealing with V4
6211          * we use a larger frag point.
6212          */
6213         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6214                 ovh = SCTP_MED_OVERHEAD;
6215         } else {
6216                 ovh = SCTP_MED_V4_OVERHEAD;
6217         }
6218
6219         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6220                 siz = asoc->smallest_mtu - ovh;
6221         else
6222                 siz = (stcb->asoc.sctp_frag_point - ovh);
6223         /*
6224          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6225          */
6226         /* A data chunk MUST fit in a cluster */
6227         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6228         /* } */
6229
6230         /* adjust for an AUTH chunk if DATA requires auth */
6231         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6232                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6233
6234         if (siz % 4) {
6235                 /* make it an even word boundary please */
6236                 siz -= (siz % 4);
6237         }
6238         return (siz);
6239 }
6240
6241 static void
6242 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6243 {
6244         /*
6245          * We assume that the user wants PR_SCTP_TTL if the user provides a
6246          * positive lifetime but does not specify any PR_SCTP policy.
6247          */
6248         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6249                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6250         } else if (sp->timetolive > 0) {
6251                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6252                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6253         } else {
6254                 return;
6255         }
6256         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6257         case CHUNK_FLAGS_PR_SCTP_BUF:
6258                 /*
6259                  * Time to live is a priority stored in tv_sec when doing
6260                  * the buffer drop thing.
6261                  */
6262                 sp->ts.tv_sec = sp->timetolive;
6263                 sp->ts.tv_usec = 0;
6264                 break;
6265         case CHUNK_FLAGS_PR_SCTP_TTL:
6266                 {
6267                         struct timeval tv;
6268
6269                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6270                         tv.tv_sec = sp->timetolive / 1000;
6271                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6272                         /*
6273                          * TODO sctp_constants.h needs alternative time
6274                          * macros when _KERNEL is undefined.
6275                          */
6276                         timevaladd(&sp->ts, &tv);
6277                 }
6278                 break;
6279         case CHUNK_FLAGS_PR_SCTP_RTX:
6280                 /*
6281                  * Time to live is a the number or retransmissions stored in
6282                  * tv_sec.
6283                  */
6284                 sp->ts.tv_sec = sp->timetolive;
6285                 sp->ts.tv_usec = 0;
6286                 break;
6287         default:
6288                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6289                     "Unknown PR_SCTP policy %u.\n",
6290                     PR_SCTP_POLICY(sp->sinfo_flags));
6291                 break;
6292         }
6293 }
6294
6295 static int
6296 sctp_msg_append(struct sctp_tcb *stcb,
6297     struct sctp_nets *net,
6298     struct mbuf *m,
6299     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6300 {
6301         int error = 0;
6302         struct mbuf *at;
6303         struct sctp_stream_queue_pending *sp = NULL;
6304         struct sctp_stream_out *strm;
6305
6306         /*
6307          * Given an mbuf chain, put it into the association send queue and
6308          * place it on the wheel
6309          */
6310         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6311                 /* Invalid stream number */
6312                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6313                 error = EINVAL;
6314                 goto out_now;
6315         }
6316         if ((stcb->asoc.stream_locked) &&
6317             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6318                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6319                 error = EINVAL;
6320                 goto out_now;
6321         }
6322         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6323         /* Now can we send this? */
6324         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6325             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6326             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6327             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6328                 /* got data while shutting down */
6329                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6330                 error = ECONNRESET;
6331                 goto out_now;
6332         }
6333         sctp_alloc_a_strmoq(stcb, sp);
6334         if (sp == NULL) {
6335                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6336                 error = ENOMEM;
6337                 goto out_now;
6338         }
6339         sp->sinfo_flags = srcv->sinfo_flags;
6340         sp->timetolive = srcv->sinfo_timetolive;
6341         sp->ppid = srcv->sinfo_ppid;
6342         sp->context = srcv->sinfo_context;
6343         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6344                 sp->net = net;
6345                 atomic_add_int(&sp->net->ref_count, 1);
6346         } else {
6347                 sp->net = NULL;
6348         }
6349         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6350         sp->stream = srcv->sinfo_stream;
6351         sp->msg_is_complete = 1;
6352         sp->sender_all_done = 1;
6353         sp->some_taken = 0;
6354         sp->data = m;
6355         sp->tail_mbuf = NULL;
6356         sctp_set_prsctp_policy(sp);
6357         /*
6358          * We could in theory (for sendall) sifa the length in, but we would
6359          * still have to hunt through the chain since we need to setup the
6360          * tail_mbuf
6361          */
6362         sp->length = 0;
6363         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6364                 if (SCTP_BUF_NEXT(at) == NULL)
6365                         sp->tail_mbuf = at;
6366                 sp->length += SCTP_BUF_LEN(at);
6367         }
6368         if (srcv->sinfo_keynumber_valid) {
6369                 sp->auth_keyid = srcv->sinfo_keynumber;
6370         } else {
6371                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6372         }
6373         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6374                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6375                 sp->holds_key_ref = 1;
6376         }
6377         if (hold_stcb_lock == 0) {
6378                 SCTP_TCB_SEND_LOCK(stcb);
6379         }
6380         sctp_snd_sb_alloc(stcb, sp->length);
6381         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6382         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6383         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6384         m = NULL;
6385         if (hold_stcb_lock == 0) {
6386                 SCTP_TCB_SEND_UNLOCK(stcb);
6387         }
6388 out_now:
6389         if (m) {
6390                 sctp_m_freem(m);
6391         }
6392         return (error);
6393 }
6394
6395
6396 static struct mbuf *
6397 sctp_copy_mbufchain(struct mbuf *clonechain,
6398     struct mbuf *outchain,
6399     struct mbuf **endofchain,
6400     int can_take_mbuf,
6401     int sizeofcpy,
6402     uint8_t copy_by_ref)
6403 {
6404         struct mbuf *m;
6405         struct mbuf *appendchain;
6406         caddr_t cp;
6407         int len;
6408
6409         if (endofchain == NULL) {
6410                 /* error */
6411 error_out:
6412                 if (outchain)
6413                         sctp_m_freem(outchain);
6414                 return (NULL);
6415         }
6416         if (can_take_mbuf) {
6417                 appendchain = clonechain;
6418         } else {
6419                 if (!copy_by_ref &&
6420                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6421                     ) {
6422                         /* Its not in a cluster */
6423                         if (*endofchain == NULL) {
6424                                 /* lets get a mbuf cluster */
6425                                 if (outchain == NULL) {
6426                                         /* This is the general case */
6427                         new_mbuf:
6428                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6429                                         if (outchain == NULL) {
6430                                                 goto error_out;
6431                                         }
6432                                         SCTP_BUF_LEN(outchain) = 0;
6433                                         *endofchain = outchain;
6434                                         /* get the prepend space */
6435                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6436                                 } else {
6437                                         /*
6438                                          * We really should not get a NULL
6439                                          * in endofchain
6440                                          */
6441                                         /* find end */
6442                                         m = outchain;
6443                                         while (m) {
6444                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6445                                                         *endofchain = m;
6446                                                         break;
6447                                                 }
6448                                                 m = SCTP_BUF_NEXT(m);
6449                                         }
6450                                         /* sanity */
6451                                         if (*endofchain == NULL) {
6452                                                 /*
6453                                                  * huh, TSNH XXX maybe we
6454                                                  * should panic
6455                                                  */
6456                                                 sctp_m_freem(outchain);
6457                                                 goto new_mbuf;
6458                                         }
6459                                 }
6460                                 /* get the new end of length */
6461                                 len = M_TRAILINGSPACE(*endofchain);
6462                         } else {
6463                                 /* how much is left at the end? */
6464                                 len = M_TRAILINGSPACE(*endofchain);
6465                         }
6466                         /* Find the end of the data, for appending */
6467                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6468
6469                         /* Now lets copy it out */
6470                         if (len >= sizeofcpy) {
6471                                 /* It all fits, copy it in */
6472                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6473                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6474                         } else {
6475                                 /* fill up the end of the chain */
6476                                 if (len > 0) {
6477                                         m_copydata(clonechain, 0, len, cp);
6478                                         SCTP_BUF_LEN((*endofchain)) += len;
6479                                         /* now we need another one */
6480                                         sizeofcpy -= len;
6481                                 }
6482                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6483                                 if (m == NULL) {
6484                                         /* We failed */
6485                                         goto error_out;
6486                                 }
6487                                 SCTP_BUF_NEXT((*endofchain)) = m;
6488                                 *endofchain = m;
6489                                 cp = mtod((*endofchain), caddr_t);
6490                                 m_copydata(clonechain, len, sizeofcpy, cp);
6491                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6492                         }
6493                         return (outchain);
6494                 } else {
6495                         /* copy the old fashion way */
6496                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6497 #ifdef SCTP_MBUF_LOGGING
6498                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6499                                 struct mbuf *mat;
6500
6501                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6502                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6503                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6504                                         }
6505                                 }
6506                         }
6507 #endif
6508                 }
6509         }
6510         if (appendchain == NULL) {
6511                 /* error */
6512                 if (outchain)
6513                         sctp_m_freem(outchain);
6514                 return (NULL);
6515         }
6516         if (outchain) {
6517                 /* tack on to the end */
6518                 if (*endofchain != NULL) {
6519                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6520                 } else {
6521                         m = outchain;
6522                         while (m) {
6523                                 if (SCTP_BUF_NEXT(m) == NULL) {
6524                                         SCTP_BUF_NEXT(m) = appendchain;
6525                                         break;
6526                                 }
6527                                 m = SCTP_BUF_NEXT(m);
6528                         }
6529                 }
6530                 /*
6531                  * save off the end and update the end-chain postion
6532                  */
6533                 m = appendchain;
6534                 while (m) {
6535                         if (SCTP_BUF_NEXT(m) == NULL) {
6536                                 *endofchain = m;
6537                                 break;
6538                         }
6539                         m = SCTP_BUF_NEXT(m);
6540                 }
6541                 return (outchain);
6542         } else {
6543                 /* save off the end and update the end-chain postion */
6544                 m = appendchain;
6545                 while (m) {
6546                         if (SCTP_BUF_NEXT(m) == NULL) {
6547                                 *endofchain = m;
6548                                 break;
6549                         }
6550                         m = SCTP_BUF_NEXT(m);
6551                 }
6552                 return (appendchain);
6553         }
6554 }
6555
6556 static int
6557 sctp_med_chunk_output(struct sctp_inpcb *inp,
6558     struct sctp_tcb *stcb,
6559     struct sctp_association *asoc,
6560     int *num_out,
6561     int *reason_code,
6562     int control_only, int from_where,
6563     struct timeval *now, int *now_filled, int frag_point, int so_locked
6564 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6565     SCTP_UNUSED
6566 #endif
6567 );
6568
6569 static void
6570 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6571     uint32_t val SCTP_UNUSED)
6572 {
6573         struct sctp_copy_all *ca;
6574         struct mbuf *m;
6575         int ret = 0;
6576         int added_control = 0;
6577         int un_sent, do_chunk_output = 1;
6578         struct sctp_association *asoc;
6579         struct sctp_nets *net;
6580
6581         ca = (struct sctp_copy_all *)ptr;
6582         if (ca->m == NULL) {
6583                 return;
6584         }
6585         if (ca->inp != inp) {
6586                 /* TSNH */
6587                 return;
6588         }
6589         if (ca->sndlen > 0) {
6590                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6591                 if (m == NULL) {
6592                         /* can't copy so we are done */
6593                         ca->cnt_failed++;
6594                         return;
6595                 }
6596 #ifdef SCTP_MBUF_LOGGING
6597                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6598                         struct mbuf *mat;
6599
6600                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6601                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6602                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6603                                 }
6604                         }
6605                 }
6606 #endif
6607         } else {
6608                 m = NULL;
6609         }
6610         SCTP_TCB_LOCK_ASSERT(stcb);
6611         if (stcb->asoc.alternate) {
6612                 net = stcb->asoc.alternate;
6613         } else {
6614                 net = stcb->asoc.primary_destination;
6615         }
6616         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6617                 /* Abort this assoc with m as the user defined reason */
6618                 if (m != NULL) {
6619                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6620                 } else {
6621                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6622                             0, M_NOWAIT, 1, MT_DATA);
6623                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6624                 }
6625                 if (m != NULL) {
6626                         struct sctp_paramhdr *ph;
6627
6628                         ph = mtod(m, struct sctp_paramhdr *);
6629                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6630                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6631                 }
6632                 /*
6633                  * We add one here to keep the assoc from dis-appearing on
6634                  * us.
6635                  */
6636                 atomic_add_int(&stcb->asoc.refcnt, 1);
6637                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6638                 /*
6639                  * sctp_abort_an_association calls sctp_free_asoc() free
6640                  * association will NOT free it since we incremented the
6641                  * refcnt .. we do this to prevent it being freed and things
6642                  * getting tricky since we could end up (from free_asoc)
6643                  * calling inpcb_free which would get a recursive lock call
6644                  * to the iterator lock.. But as a consequence of that the
6645                  * stcb will return to us un-locked.. since free_asoc
6646                  * returns with either no TCB or the TCB unlocked, we must
6647                  * relock.. to unlock in the iterator timer :-0
6648                  */
6649                 SCTP_TCB_LOCK(stcb);
6650                 atomic_add_int(&stcb->asoc.refcnt, -1);
6651                 goto no_chunk_output;
6652         } else {
6653                 if (m) {
6654                         ret = sctp_msg_append(stcb, net, m,
6655                             &ca->sndrcv, 1);
6656                 }
6657                 asoc = &stcb->asoc;
6658                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6659                         /* shutdown this assoc */
6660                         int cnt;
6661
6662                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6663
6664                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6665                             TAILQ_EMPTY(&asoc->sent_queue) &&
6666                             (cnt == 0)) {
6667                                 if (asoc->locked_on_sending) {
6668                                         goto abort_anyway;
6669                                 }
6670                                 /*
6671                                  * there is nothing queued to send, so I'm
6672                                  * done...
6673                                  */
6674                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6675                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6676                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6677                                         /*
6678                                          * only send SHUTDOWN the first time
6679                                          * through
6680                                          */
6681                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6682                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6683                                         }
6684                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6685                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6686                                         sctp_stop_timers_for_shutdown(stcb);
6687                                         sctp_send_shutdown(stcb, net);
6688                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6689                                             net);
6690                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6691                                             asoc->primary_destination);
6692                                         added_control = 1;
6693                                         do_chunk_output = 0;
6694                                 }
6695                         } else {
6696                                 /*
6697                                  * we still got (or just got) data to send,
6698                                  * so set SHUTDOWN_PENDING
6699                                  */
6700                                 /*
6701                                  * XXX sockets draft says that SCTP_EOF
6702                                  * should be sent with no data.  currently,
6703                                  * we will allow user data to be sent first
6704                                  * and move to SHUTDOWN-PENDING
6705                                  */
6706                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6707                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6708                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6709                                         if (asoc->locked_on_sending) {
6710                                                 /*
6711                                                  * Locked to send out the
6712                                                  * data
6713                                                  */
6714                                                 struct sctp_stream_queue_pending *sp;
6715
6716                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6717                                                 if (sp) {
6718                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6719                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6720                                                 }
6721                                         }
6722                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6723                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6724                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6725                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6726                                 abort_anyway:
6727                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6728                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6729                                                     NULL, SCTP_SO_NOT_LOCKED);
6730                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6731                                                 goto no_chunk_output;
6732                                         }
6733                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6734                                             asoc->primary_destination);
6735                                 }
6736                         }
6737
6738                 }
6739         }
6740         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6741             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6742
6743         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6744             (stcb->asoc.total_flight > 0) &&
6745             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6746                 do_chunk_output = 0;
6747         }
6748         if (do_chunk_output)
6749                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6750         else if (added_control) {
6751                 int num_out = 0, reason = 0, now_filled = 0;
6752                 struct timeval now;
6753                 int frag_point;
6754
6755                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6756                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6757                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6758         }
6759 no_chunk_output:
6760         if (ret) {
6761                 ca->cnt_failed++;
6762         } else {
6763                 ca->cnt_sent++;
6764         }
6765 }
6766
6767 static void
6768 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6769 {
6770         struct sctp_copy_all *ca;
6771
6772         ca = (struct sctp_copy_all *)ptr;
6773         /*
6774          * Do a notify here? Kacheong suggests that the notify be done at
6775          * the send time.. so you would push up a notification if any send
6776          * failed. Don't know if this is feasable since the only failures we
6777          * have is "memory" related and if you cannot get an mbuf to send
6778          * the data you surely can't get an mbuf to send up to notify the
6779          * user you can't send the data :->
6780          */
6781
6782         /* now free everything */
6783         sctp_m_freem(ca->m);
6784         SCTP_FREE(ca, SCTP_M_COPYAL);
6785 }
6786
6787
6788 #define MC_ALIGN(m, len) do {                                           \
6789         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6790 } while (0)
6791
6792
6793
6794 static struct mbuf *
6795 sctp_copy_out_all(struct uio *uio, int len)
6796 {
6797         struct mbuf *ret, *at;
6798         int left, willcpy, cancpy, error;
6799
6800         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6801         if (ret == NULL) {
6802                 /* TSNH */
6803                 return (NULL);
6804         }
6805         left = len;
6806         SCTP_BUF_LEN(ret) = 0;
6807         /* save space for the data chunk header */
6808         cancpy = M_TRAILINGSPACE(ret);
6809         willcpy = min(cancpy, left);
6810         at = ret;
6811         while (left > 0) {
6812                 /* Align data to the end */
6813                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6814                 if (error) {
6815         err_out_now:
6816                         sctp_m_freem(at);
6817                         return (NULL);
6818                 }
6819                 SCTP_BUF_LEN(at) = willcpy;
6820                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6821                 left -= willcpy;
6822                 if (left > 0) {
6823                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6824                         if (SCTP_BUF_NEXT(at) == NULL) {
6825                                 goto err_out_now;
6826                         }
6827                         at = SCTP_BUF_NEXT(at);
6828                         SCTP_BUF_LEN(at) = 0;
6829                         cancpy = M_TRAILINGSPACE(at);
6830                         willcpy = min(cancpy, left);
6831                 }
6832         }
6833         return (ret);
6834 }
6835
6836 static int
6837 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6838     struct sctp_sndrcvinfo *srcv)
6839 {
6840         int ret;
6841         struct sctp_copy_all *ca;
6842
6843         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6844             SCTP_M_COPYAL);
6845         if (ca == NULL) {
6846                 sctp_m_freem(m);
6847                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6848                 return (ENOMEM);
6849         }
6850         memset(ca, 0, sizeof(struct sctp_copy_all));
6851
6852         ca->inp = inp;
6853         if (srcv) {
6854                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6855         }
6856         /*
6857          * take off the sendall flag, it would be bad if we failed to do
6858          * this :-0
6859          */
6860         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6861         /* get length and mbuf chain */
6862         if (uio) {
6863                 ca->sndlen = uio->uio_resid;
6864                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6865                 if (ca->m == NULL) {
6866                         SCTP_FREE(ca, SCTP_M_COPYAL);
6867                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6868                         return (ENOMEM);
6869                 }
6870         } else {
6871                 /* Gather the length of the send */
6872                 struct mbuf *mat;
6873
6874                 ca->sndlen = 0;
6875                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6876                         ca->sndlen += SCTP_BUF_LEN(mat);
6877                 }
6878         }
6879         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6880             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6881             SCTP_ASOC_ANY_STATE,
6882             (void *)ca, 0,
6883             sctp_sendall_completes, inp, 1);
6884         if (ret) {
6885                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6886                 SCTP_FREE(ca, SCTP_M_COPYAL);
6887                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6888                 return (EFAULT);
6889         }
6890         return (0);
6891 }
6892
6893
6894 void
6895 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6896 {
6897         struct sctp_tmit_chunk *chk, *nchk;
6898
6899         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6900                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6901                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6902                         if (chk->data) {
6903                                 sctp_m_freem(chk->data);
6904                                 chk->data = NULL;
6905                         }
6906                         asoc->ctrl_queue_cnt--;
6907                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6908                 }
6909         }
6910 }
6911
6912 void
6913 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6914 {
6915         struct sctp_association *asoc;
6916         struct sctp_tmit_chunk *chk, *nchk;
6917         struct sctp_asconf_chunk *acp;
6918
6919         asoc = &stcb->asoc;
6920         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6921                 /* find SCTP_ASCONF chunk in queue */
6922                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6923                         if (chk->data) {
6924                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6925                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6926                                         /* Not Acked yet */
6927                                         break;
6928                                 }
6929                         }
6930                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6931                         if (chk->data) {
6932                                 sctp_m_freem(chk->data);
6933                                 chk->data = NULL;
6934                         }
6935                         asoc->ctrl_queue_cnt--;
6936                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6937                 }
6938         }
6939 }
6940
6941
6942 static void
6943 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6944     struct sctp_association *asoc,
6945     struct sctp_tmit_chunk **data_list,
6946     int bundle_at,
6947     struct sctp_nets *net)
6948 {
6949         int i;
6950         struct sctp_tmit_chunk *tp1;
6951
6952         for (i = 0; i < bundle_at; i++) {
6953                 /* off of the send queue */
6954                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6955                 asoc->send_queue_cnt--;
6956                 if (i > 0) {
6957                         /*
6958                          * Any chunk NOT 0 you zap the time chunk 0 gets
6959                          * zapped or set based on if a RTO measurment is
6960                          * needed.
6961                          */
6962                         data_list[i]->do_rtt = 0;
6963                 }
6964                 /* record time */
6965                 data_list[i]->sent_rcv_time = net->last_sent_time;
6966                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6967                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6968                 if (data_list[i]->whoTo == NULL) {
6969                         data_list[i]->whoTo = net;
6970                         atomic_add_int(&net->ref_count, 1);
6971                 }
6972                 /* on to the sent queue */
6973                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6974                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6975                         struct sctp_tmit_chunk *tpp;
6976
6977                         /* need to move back */
6978         back_up_more:
6979                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6980                         if (tpp == NULL) {
6981                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6982                                 goto all_done;
6983                         }
6984                         tp1 = tpp;
6985                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6986                                 goto back_up_more;
6987                         }
6988                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6989                 } else {
6990                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6991                             data_list[i],
6992                             sctp_next);
6993                 }
6994 all_done:
6995                 /* This does not lower until the cum-ack passes it */
6996                 asoc->sent_queue_cnt++;
6997                 if ((asoc->peers_rwnd <= 0) &&
6998                     (asoc->total_flight == 0) &&
6999                     (bundle_at == 1)) {
7000                         /* Mark the chunk as being a window probe */
7001                         SCTP_STAT_INCR(sctps_windowprobed);
7002                 }
7003 #ifdef SCTP_AUDITING_ENABLED
7004                 sctp_audit_log(0xC2, 3);
7005 #endif
7006                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7007                 data_list[i]->snd_count = 1;
7008                 data_list[i]->rec.data.chunk_was_revoked = 0;
7009                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7010                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7011                             data_list[i]->whoTo->flight_size,
7012                             data_list[i]->book_size,
7013                             (uintptr_t) data_list[i]->whoTo,
7014                             data_list[i]->rec.data.TSN_seq);
7015                 }
7016                 sctp_flight_size_increase(data_list[i]);
7017                 sctp_total_flight_increase(stcb, data_list[i]);
7018                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7019                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7020                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7021                 }
7022                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7023                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7024                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7025                         /* SWS sender side engages */
7026                         asoc->peers_rwnd = 0;
7027                 }
7028         }
7029         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7030                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7031         }
7032 }
7033
7034 static void
7035 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7036 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7037     SCTP_UNUSED
7038 #endif
7039 )
7040 {
7041         struct sctp_tmit_chunk *chk, *nchk;
7042
7043         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7044                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7045                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7046                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7047                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7048                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7049                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7050                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7051                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7052                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7053                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7054                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7055                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7056                         /* Stray chunks must be cleaned up */
7057         clean_up_anyway:
7058                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7059                         if (chk->data) {
7060                                 sctp_m_freem(chk->data);
7061                                 chk->data = NULL;
7062                         }
7063                         asoc->ctrl_queue_cnt--;
7064                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7065                                 asoc->fwd_tsn_cnt--;
7066                         sctp_free_a_chunk(stcb, chk, so_locked);
7067                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7068                         /* special handling, we must look into the param */
7069                         if (chk != asoc->str_reset) {
7070                                 goto clean_up_anyway;
7071                         }
7072                 }
7073         }
7074 }
7075
7076
7077 static int
7078 sctp_can_we_split_this(struct sctp_tcb *stcb,
7079     uint32_t length,
7080     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7081 {
7082         /*
7083          * Make a decision on if I should split a msg into multiple parts.
7084          * This is only asked of incomplete messages.
7085          */
7086         if (eeor_on) {
7087                 /*
7088                  * If we are doing EEOR we need to always send it if its the
7089                  * entire thing, since it might be all the guy is putting in
7090                  * the hopper.
7091                  */
7092                 if (goal_mtu >= length) {
7093                         /*-
7094                          * If we have data outstanding,
7095                          * we get another chance when the sack
7096                          * arrives to transmit - wait for more data
7097                          */
7098                         if (stcb->asoc.total_flight == 0) {
7099                                 /*
7100                                  * If nothing is in flight, we zero the
7101                                  * packet counter.
7102                                  */
7103                                 return (length);
7104                         }
7105                         return (0);
7106
7107                 } else {
7108                         /* You can fill the rest */
7109                         return (goal_mtu);
7110                 }
7111         }
7112         /*-
7113          * For those strange folk that make the send buffer
7114          * smaller than our fragmentation point, we can't
7115          * get a full msg in so we have to allow splitting.
7116          */
7117         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7118                 return (length);
7119         }
7120         if ((length <= goal_mtu) ||
7121             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7122                 /* Sub-optimial residual don't split in non-eeor mode. */
7123                 return (0);
7124         }
7125         /*
7126          * If we reach here length is larger than the goal_mtu. Do we wish
7127          * to split it for the sake of packet putting together?
7128          */
7129         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7130                 /* Its ok to split it */
7131                 return (min(goal_mtu, frag_point));
7132         }
7133         /* Nope, can't split */
7134         return (0);
7135
7136 }
7137
7138 static uint32_t
7139 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7140     struct sctp_stream_out *strq,
7141     uint32_t goal_mtu,
7142     uint32_t frag_point,
7143     int *locked,
7144     int *giveup,
7145     int eeor_mode,
7146     int *bail,
7147     int so_locked
7148 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7149     SCTP_UNUSED
7150 #endif
7151 )
7152 {
7153         /* Move from the stream to the send_queue keeping track of the total */
7154         struct sctp_association *asoc;
7155         struct sctp_stream_queue_pending *sp;
7156         struct sctp_tmit_chunk *chk;
7157         struct sctp_data_chunk *dchkh;
7158         uint32_t to_move, length;
7159         uint8_t rcv_flags = 0;
7160         uint8_t some_taken;
7161         uint8_t send_lock_up = 0;
7162
7163         SCTP_TCB_LOCK_ASSERT(stcb);
7164         asoc = &stcb->asoc;
7165 one_more_time:
7166         /* sa_ignore FREED_MEMORY */
7167         sp = TAILQ_FIRST(&strq->outqueue);
7168         if (sp == NULL) {
7169                 *locked = 0;
7170                 if (send_lock_up == 0) {
7171                         SCTP_TCB_SEND_LOCK(stcb);
7172                         send_lock_up = 1;
7173                 }
7174                 sp = TAILQ_FIRST(&strq->outqueue);
7175                 if (sp) {
7176                         goto one_more_time;
7177                 }
7178                 if (strq->last_msg_incomplete) {
7179                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7180                             strq->stream_no,
7181                             strq->last_msg_incomplete);
7182                         strq->last_msg_incomplete = 0;
7183                 }
7184                 to_move = 0;
7185                 if (send_lock_up) {
7186                         SCTP_TCB_SEND_UNLOCK(stcb);
7187                         send_lock_up = 0;
7188                 }
7189                 goto out_of;
7190         }
7191         if ((sp->msg_is_complete) && (sp->length == 0)) {
7192                 if (sp->sender_all_done) {
7193                         /*
7194                          * We are doing differed cleanup. Last time through
7195                          * when we took all the data the sender_all_done was
7196                          * not set.
7197                          */
7198                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7199                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7200                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7201                                     sp->sender_all_done,
7202                                     sp->length,
7203                                     sp->msg_is_complete,
7204                                     sp->put_last_out,
7205                                     send_lock_up);
7206                         }
7207                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7208                                 SCTP_TCB_SEND_LOCK(stcb);
7209                                 send_lock_up = 1;
7210                         }
7211                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7212                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7213                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7214                         if (sp->net) {
7215                                 sctp_free_remote_addr(sp->net);
7216                                 sp->net = NULL;
7217                         }
7218                         if (sp->data) {
7219                                 sctp_m_freem(sp->data);
7220                                 sp->data = NULL;
7221                         }
7222                         sctp_free_a_strmoq(stcb, sp, so_locked);
7223                         /* we can't be locked to it */
7224                         *locked = 0;
7225                         stcb->asoc.locked_on_sending = NULL;
7226                         if (send_lock_up) {
7227                                 SCTP_TCB_SEND_UNLOCK(stcb);
7228                                 send_lock_up = 0;
7229                         }
7230                         /* back to get the next msg */
7231                         goto one_more_time;
7232                 } else {
7233                         /*
7234                          * sender just finished this but still holds a
7235                          * reference
7236                          */
7237                         *locked = 1;
7238                         *giveup = 1;
7239                         to_move = 0;
7240                         goto out_of;
7241                 }
7242         } else {
7243                 /* is there some to get */
7244                 if (sp->length == 0) {
7245                         /* no */
7246                         *locked = 1;
7247                         *giveup = 1;
7248                         to_move = 0;
7249                         goto out_of;
7250                 } else if (sp->discard_rest) {
7251                         if (send_lock_up == 0) {
7252                                 SCTP_TCB_SEND_LOCK(stcb);
7253                                 send_lock_up = 1;
7254                         }
7255                         /* Whack down the size */
7256                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7257                         if ((stcb->sctp_socket != NULL) && \
7258                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7259                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7260                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7261                         }
7262                         if (sp->data) {
7263                                 sctp_m_freem(sp->data);
7264                                 sp->data = NULL;
7265                                 sp->tail_mbuf = NULL;
7266                         }
7267                         sp->length = 0;
7268                         sp->some_taken = 1;
7269                         *locked = 1;
7270                         *giveup = 1;
7271                         to_move = 0;
7272                         goto out_of;
7273                 }
7274         }
7275         some_taken = sp->some_taken;
7276         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7277                 sp->msg_is_complete = 1;
7278         }
7279 re_look:
7280         length = sp->length;
7281         if (sp->msg_is_complete) {
7282                 /* The message is complete */
7283                 to_move = min(length, frag_point);
7284                 if (to_move == length) {
7285                         /* All of it fits in the MTU */
7286                         if (sp->some_taken) {
7287                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7288                                 sp->put_last_out = 1;
7289                         } else {
7290                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7291                                 sp->put_last_out = 1;
7292                         }
7293                 } else {
7294                         /* Not all of it fits, we fragment */
7295                         if (sp->some_taken == 0) {
7296                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7297                         }
7298                         sp->some_taken = 1;
7299                 }
7300         } else {
7301                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7302                 if (to_move) {
7303                         /*-
7304                          * We use a snapshot of length in case it
7305                          * is expanding during the compare.
7306                          */
7307                         uint32_t llen;
7308
7309                         llen = length;
7310                         if (to_move >= llen) {
7311                                 to_move = llen;
7312                                 if (send_lock_up == 0) {
7313                                         /*-
7314                                          * We are taking all of an incomplete msg
7315                                          * thus we need a send lock.
7316                                          */
7317                                         SCTP_TCB_SEND_LOCK(stcb);
7318                                         send_lock_up = 1;
7319                                         if (sp->msg_is_complete) {
7320                                                 /*
7321                                                  * the sender finished the
7322                                                  * msg
7323                                                  */
7324                                                 goto re_look;
7325                                         }
7326                                 }
7327                         }
7328                         if (sp->some_taken == 0) {
7329                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7330                                 sp->some_taken = 1;
7331                         }
7332                 } else {
7333                         /* Nothing to take. */
7334                         if (sp->some_taken) {
7335                                 *locked = 1;
7336                         }
7337                         *giveup = 1;
7338                         to_move = 0;
7339                         goto out_of;
7340                 }
7341         }
7342
7343         /* If we reach here, we can copy out a chunk */
7344         sctp_alloc_a_chunk(stcb, chk);
7345         if (chk == NULL) {
7346                 /* No chunk memory */
7347                 *giveup = 1;
7348                 to_move = 0;
7349                 goto out_of;
7350         }
7351         /*
7352          * Setup for unordered if needed by looking at the user sent info
7353          * flags.
7354          */
7355         if (sp->sinfo_flags & SCTP_UNORDERED) {
7356                 rcv_flags |= SCTP_DATA_UNORDERED;
7357         }
7358         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7359             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7360                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7361         }
7362         /* clear out the chunk before setting up */
7363         memset(chk, 0, sizeof(*chk));
7364         chk->rec.data.rcv_flags = rcv_flags;
7365
7366         if (to_move >= length) {
7367                 /* we think we can steal the whole thing */
7368                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7369                         SCTP_TCB_SEND_LOCK(stcb);
7370                         send_lock_up = 1;
7371                 }
7372                 if (to_move < sp->length) {
7373                         /* bail, it changed */
7374                         goto dont_do_it;
7375                 }
7376                 chk->data = sp->data;
7377                 chk->last_mbuf = sp->tail_mbuf;
7378                 /* register the stealing */
7379                 sp->data = sp->tail_mbuf = NULL;
7380         } else {
7381                 struct mbuf *m;
7382
7383 dont_do_it:
7384                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7385                 chk->last_mbuf = NULL;
7386                 if (chk->data == NULL) {
7387                         sp->some_taken = some_taken;
7388                         sctp_free_a_chunk(stcb, chk, so_locked);
7389                         *bail = 1;
7390                         to_move = 0;
7391                         goto out_of;
7392                 }
7393 #ifdef SCTP_MBUF_LOGGING
7394                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7395                         struct mbuf *mat;
7396
7397                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7398                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7399                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7400                                 }
7401                         }
7402                 }
7403 #endif
7404                 /* Pull off the data */
7405                 m_adj(sp->data, to_move);
7406                 /* Now lets work our way down and compact it */
7407                 m = sp->data;
7408                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7409                         sp->data = SCTP_BUF_NEXT(m);
7410                         SCTP_BUF_NEXT(m) = NULL;
7411                         if (sp->tail_mbuf == m) {
7412                                 /*-
7413                                  * Freeing tail? TSNH since
7414                                  * we supposedly were taking less
7415                                  * than the sp->length.
7416                                  */
7417 #ifdef INVARIANTS
7418                                 panic("Huh, freing tail? - TSNH");
7419 #else
7420                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7421                                 sp->tail_mbuf = sp->data = NULL;
7422                                 sp->length = 0;
7423 #endif
7424
7425                         }
7426                         sctp_m_free(m);
7427                         m = sp->data;
7428                 }
7429         }
7430         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7431                 chk->copy_by_ref = 1;
7432         } else {
7433                 chk->copy_by_ref = 0;
7434         }
7435         /*
7436          * get last_mbuf and counts of mb useage This is ugly but hopefully
7437          * its only one mbuf.
7438          */
7439         if (chk->last_mbuf == NULL) {
7440                 chk->last_mbuf = chk->data;
7441                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7442                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7443                 }
7444         }
7445         if (to_move > length) {
7446                 /*- This should not happen either
7447                  * since we always lower to_move to the size
7448                  * of sp->length if its larger.
7449                  */
7450 #ifdef INVARIANTS
7451                 panic("Huh, how can to_move be larger?");
7452 #else
7453                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7454                 sp->length = 0;
7455 #endif
7456         } else {
7457                 atomic_subtract_int(&sp->length, to_move);
7458         }
7459         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7460                 /* Not enough room for a chunk header, get some */
7461                 struct mbuf *m;
7462
7463                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7464                 if (m == NULL) {
7465                         /*
7466                          * we're in trouble here. _PREPEND below will free
7467                          * all the data if there is no leading space, so we
7468                          * must put the data back and restore.
7469                          */
7470                         if (send_lock_up == 0) {
7471                                 SCTP_TCB_SEND_LOCK(stcb);
7472                                 send_lock_up = 1;
7473                         }
7474                         if (chk->data == NULL) {
7475                                 /* unsteal the data */
7476                                 sp->data = chk->data;
7477                                 sp->tail_mbuf = chk->last_mbuf;
7478                         } else {
7479                                 struct mbuf *m_tmp;
7480
7481                                 /* reassemble the data */
7482                                 m_tmp = sp->data;
7483                                 sp->data = chk->data;
7484                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7485                         }
7486                         sp->some_taken = some_taken;
7487                         atomic_add_int(&sp->length, to_move);
7488                         chk->data = NULL;
7489                         *bail = 1;
7490                         sctp_free_a_chunk(stcb, chk, so_locked);
7491                         to_move = 0;
7492                         goto out_of;
7493                 } else {
7494                         SCTP_BUF_LEN(m) = 0;
7495                         SCTP_BUF_NEXT(m) = chk->data;
7496                         chk->data = m;
7497                         M_ALIGN(chk->data, 4);
7498                 }
7499         }
7500         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7501         if (chk->data == NULL) {
7502                 /* HELP, TSNH since we assured it would not above? */
7503 #ifdef INVARIANTS
7504                 panic("prepend failes HELP?");
7505 #else
7506                 SCTP_PRINTF("prepend fails HELP?\n");
7507                 sctp_free_a_chunk(stcb, chk, so_locked);
7508 #endif
7509                 *bail = 1;
7510                 to_move = 0;
7511                 goto out_of;
7512         }
7513         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7514         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7515         chk->book_size_scale = 0;
7516         chk->sent = SCTP_DATAGRAM_UNSENT;
7517
7518         chk->flags = 0;
7519         chk->asoc = &stcb->asoc;
7520         chk->pad_inplace = 0;
7521         chk->no_fr_allowed = 0;
7522         chk->rec.data.stream_seq = strq->next_sequence_send;
7523         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7524             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7525                 strq->next_sequence_send++;
7526         }
7527         chk->rec.data.stream_number = sp->stream;
7528         chk->rec.data.payloadtype = sp->ppid;
7529         chk->rec.data.context = sp->context;
7530         chk->rec.data.doing_fast_retransmit = 0;
7531
7532         chk->rec.data.timetodrop = sp->ts;
7533         chk->flags = sp->act_flags;
7534
7535         if (sp->net) {
7536                 chk->whoTo = sp->net;
7537                 atomic_add_int(&chk->whoTo->ref_count, 1);
7538         } else
7539                 chk->whoTo = NULL;
7540
7541         if (sp->holds_key_ref) {
7542                 chk->auth_keyid = sp->auth_keyid;
7543                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7544                 chk->holds_key_ref = 1;
7545         }
7546         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7547         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7548                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7549                     (uintptr_t) stcb, sp->length,
7550                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7551                     chk->rec.data.TSN_seq);
7552         }
7553         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7554         /*
7555          * Put the rest of the things in place now. Size was done earlier in
7556          * previous loop prior to padding.
7557          */
7558
7559 #ifdef SCTP_ASOCLOG_OF_TSNS
7560         SCTP_TCB_LOCK_ASSERT(stcb);
7561         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7562                 asoc->tsn_out_at = 0;
7563                 asoc->tsn_out_wrapped = 1;
7564         }
7565         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7566         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7567         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7568         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7569         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7570         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7571         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7572         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7573         asoc->tsn_out_at++;
7574 #endif
7575
7576         dchkh->ch.chunk_type = SCTP_DATA;
7577         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7578         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7579         dchkh->dp.stream_id = htons(strq->stream_no);
7580         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7581         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7582         dchkh->ch.chunk_length = htons(chk->send_size);
7583         /* Now advance the chk->send_size by the actual pad needed. */
7584         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7585                 /* need a pad */
7586                 struct mbuf *lm;
7587                 int pads;
7588
7589                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7590                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7591                 if (lm != NULL) {
7592                         chk->last_mbuf = lm;
7593                         chk->pad_inplace = 1;
7594                 }
7595                 chk->send_size += pads;
7596         }
7597         if (PR_SCTP_ENABLED(chk->flags)) {
7598                 asoc->pr_sctp_cnt++;
7599         }
7600         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7601                 /* All done pull and kill the message */
7602                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7603                 if (sp->put_last_out == 0) {
7604                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7605                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7606                             sp->sender_all_done,
7607                             sp->length,
7608                             sp->msg_is_complete,
7609                             sp->put_last_out,
7610                             send_lock_up);
7611                 }
7612                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7613                         SCTP_TCB_SEND_LOCK(stcb);
7614                         send_lock_up = 1;
7615                 }
7616                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7617                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7618                 if (sp->net) {
7619                         sctp_free_remote_addr(sp->net);
7620                         sp->net = NULL;
7621                 }
7622                 if (sp->data) {
7623                         sctp_m_freem(sp->data);
7624                         sp->data = NULL;
7625                 }
7626                 sctp_free_a_strmoq(stcb, sp, so_locked);
7627
7628                 /* we can't be locked to it */
7629                 *locked = 0;
7630                 stcb->asoc.locked_on_sending = NULL;
7631         } else {
7632                 /* more to go, we are locked */
7633                 *locked = 1;
7634         }
7635         asoc->chunks_on_out_queue++;
7636         strq->chunks_on_queues++;
7637         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7638         asoc->send_queue_cnt++;
7639 out_of:
7640         if (send_lock_up) {
7641                 SCTP_TCB_SEND_UNLOCK(stcb);
7642         }
7643         return (to_move);
7644 }
7645
7646
7647 static void
7648 sctp_fill_outqueue(struct sctp_tcb *stcb,
7649     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7650 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7651     SCTP_UNUSED
7652 #endif
7653 )
7654 {
7655         struct sctp_association *asoc;
7656         struct sctp_stream_out *strq;
7657         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7658         int locked, giveup;
7659
7660         SCTP_TCB_LOCK_ASSERT(stcb);
7661         asoc = &stcb->asoc;
7662         switch (net->ro._l_addr.sa.sa_family) {
7663 #ifdef INET
7664         case AF_INET:
7665                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7666                 break;
7667 #endif
7668 #ifdef INET6
7669         case AF_INET6:
7670                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7671                 break;
7672 #endif
7673         default:
7674                 /* TSNH */
7675                 goal_mtu = net->mtu;
7676                 break;
7677         }
7678         /* Need an allowance for the data chunk header too */
7679         goal_mtu -= sizeof(struct sctp_data_chunk);
7680
7681         /* must make even word boundary */
7682         goal_mtu &= 0xfffffffc;
7683         if (asoc->locked_on_sending) {
7684                 /* We are stuck on one stream until the message completes. */
7685                 strq = asoc->locked_on_sending;
7686                 locked = 1;
7687         } else {
7688                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7689                 locked = 0;
7690         }
7691         while ((goal_mtu > 0) && strq) {
7692                 giveup = 0;
7693                 bail = 0;
7694                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7695                     &giveup, eeor_mode, &bail, so_locked);
7696                 if (moved_how_much)
7697                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7698
7699                 if (locked) {
7700                         asoc->locked_on_sending = strq;
7701                         if ((moved_how_much == 0) || (giveup) || bail)
7702                                 /* no more to move for now */
7703                                 break;
7704                 } else {
7705                         asoc->locked_on_sending = NULL;
7706                         if ((giveup) || bail) {
7707                                 break;
7708                         }
7709                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7710                         if (strq == NULL) {
7711                                 break;
7712                         }
7713                 }
7714                 total_moved += moved_how_much;
7715                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7716                 goal_mtu &= 0xfffffffc;
7717         }
7718         if (bail)
7719                 *quit_now = 1;
7720
7721         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7722
7723         if (total_moved == 0) {
7724                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7725                     (net == stcb->asoc.primary_destination)) {
7726                         /* ran dry for primary network net */
7727                         SCTP_STAT_INCR(sctps_primary_randry);
7728                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7729                         /* ran dry with CMT on */
7730                         SCTP_STAT_INCR(sctps_cmt_randry);
7731                 }
7732         }
7733 }
7734
7735 void
7736 sctp_fix_ecn_echo(struct sctp_association *asoc)
7737 {
7738         struct sctp_tmit_chunk *chk;
7739
7740         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7741                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7742                         chk->sent = SCTP_DATAGRAM_UNSENT;
7743                 }
7744         }
7745 }
7746
7747 void
7748 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7749 {
7750         struct sctp_association *asoc;
7751         struct sctp_tmit_chunk *chk;
7752         struct sctp_stream_queue_pending *sp;
7753         unsigned int i;
7754
7755         if (net == NULL) {
7756                 return;
7757         }
7758         asoc = &stcb->asoc;
7759         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7760                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7761                         if (sp->net == net) {
7762                                 sctp_free_remote_addr(sp->net);
7763                                 sp->net = NULL;
7764                         }
7765                 }
7766         }
7767         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7768                 if (chk->whoTo == net) {
7769                         sctp_free_remote_addr(chk->whoTo);
7770                         chk->whoTo = NULL;
7771                 }
7772         }
7773 }
7774
7775 int
7776 sctp_med_chunk_output(struct sctp_inpcb *inp,
7777     struct sctp_tcb *stcb,
7778     struct sctp_association *asoc,
7779     int *num_out,
7780     int *reason_code,
7781     int control_only, int from_where,
7782     struct timeval *now, int *now_filled, int frag_point, int so_locked
7783 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7784     SCTP_UNUSED
7785 #endif
7786 )
7787 {
7788         /**
7789          * Ok this is the generic chunk service queue. we must do the
7790          * following: - Service the stream queue that is next, moving any
7791          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7792          * LAST to the out queue in one pass) and assigning TSN's - Check to
7793          * see if the cwnd/rwnd allows any output, if so we go ahead and
7794          * fomulate and send the low level chunks. Making sure to combine
7795          * any control in the control chunk queue also.
7796          */
7797         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7798         struct mbuf *outchain, *endoutchain;
7799         struct sctp_tmit_chunk *chk, *nchk;
7800
7801         /* temp arrays for unlinking */
7802         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7803         int no_fragmentflg, error;
7804         unsigned int max_rwnd_per_dest, max_send_per_dest;
7805         int one_chunk, hbflag, skip_data_for_this_net;
7806         int asconf, cookie, no_out_cnt;
7807         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7808         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7809         int tsns_sent = 0;
7810         uint32_t auth_offset = 0;
7811         struct sctp_auth_chunk *auth = NULL;
7812         uint16_t auth_keyid;
7813         int override_ok = 1;
7814         int skip_fill_up = 0;
7815         int data_auth_reqd = 0;
7816
7817         /*
7818          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7819          * destination.
7820          */
7821         int quit_now = 0;
7822
7823         *num_out = 0;
7824         auth_keyid = stcb->asoc.authinfo.active_keyid;
7825         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7826             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7827             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7828                 eeor_mode = 1;
7829         } else {
7830                 eeor_mode = 0;
7831         }
7832         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7833         /*
7834          * First lets prime the pump. For each destination, if there is room
7835          * in the flight size, attempt to pull an MTU's worth out of the
7836          * stream queues into the general send_queue
7837          */
7838 #ifdef SCTP_AUDITING_ENABLED
7839         sctp_audit_log(0xC2, 2);
7840 #endif
7841         SCTP_TCB_LOCK_ASSERT(stcb);
7842         hbflag = 0;
7843         if ((control_only) || (asoc->stream_reset_outstanding))
7844                 no_data_chunks = 1;
7845         else
7846                 no_data_chunks = 0;
7847
7848         /* Nothing to possible to send? */
7849         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7850             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7851             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7852             TAILQ_EMPTY(&asoc->send_queue) &&
7853             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7854 nothing_to_send:
7855                 *reason_code = 9;
7856                 return (0);
7857         }
7858         if (asoc->peers_rwnd == 0) {
7859                 /* No room in peers rwnd */
7860                 *reason_code = 1;
7861                 if (asoc->total_flight > 0) {
7862                         /* we are allowed one chunk in flight */
7863                         no_data_chunks = 1;
7864                 }
7865         }
7866         if (stcb->asoc.ecn_echo_cnt_onq) {
7867                 /* Record where a sack goes, if any */
7868                 if (no_data_chunks &&
7869                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7870                         /* Nothing but ECNe to send - we don't do that */
7871                         goto nothing_to_send;
7872                 }
7873                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7874                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7875                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7876                                 sack_goes_to = chk->whoTo;
7877                                 break;
7878                         }
7879                 }
7880         }
7881         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7882         if (stcb->sctp_socket)
7883                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7884         else
7885                 max_send_per_dest = 0;
7886         if (no_data_chunks == 0) {
7887                 /* How many non-directed chunks are there? */
7888                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7889                         if (chk->whoTo == NULL) {
7890                                 /*
7891                                  * We already have non-directed chunks on
7892                                  * the queue, no need to do a fill-up.
7893                                  */
7894                                 skip_fill_up = 1;
7895                                 break;
7896                         }
7897                 }
7898
7899         }
7900         if ((no_data_chunks == 0) &&
7901             (skip_fill_up == 0) &&
7902             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7903                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7904                         /*
7905                          * This for loop we are in takes in each net, if
7906                          * its's got space in cwnd and has data sent to it
7907                          * (when CMT is off) then it calls
7908                          * sctp_fill_outqueue for the net. This gets data on
7909                          * the send queue for that network.
7910                          *
7911                          * In sctp_fill_outqueue TSN's are assigned and data is
7912                          * copied out of the stream buffers. Note mostly
7913                          * copy by reference (we hope).
7914                          */
7915                         net->window_probe = 0;
7916                         if ((net != stcb->asoc.alternate) &&
7917                             ((net->dest_state & SCTP_ADDR_PF) ||
7918                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7919                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7920                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7921                                         sctp_log_cwnd(stcb, net, 1,
7922                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7923                                 }
7924                                 continue;
7925                         }
7926                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7927                             (net->flight_size == 0)) {
7928                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7929                         }
7930                         if (net->flight_size >= net->cwnd) {
7931                                 /* skip this network, no room - can't fill */
7932                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7933                                         sctp_log_cwnd(stcb, net, 3,
7934                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7935                                 }
7936                                 continue;
7937                         }
7938                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7939                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7940                         }
7941                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7942                         if (quit_now) {
7943                                 /* memory alloc failure */
7944                                 no_data_chunks = 1;
7945                                 break;
7946                         }
7947                 }
7948         }
7949         /* now service each destination and send out what we can for it */
7950         /* Nothing to send? */
7951         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7952             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7953             TAILQ_EMPTY(&asoc->send_queue)) {
7954                 *reason_code = 8;
7955                 return (0);
7956         }
7957         if (asoc->sctp_cmt_on_off > 0) {
7958                 /* get the last start point */
7959                 start_at = asoc->last_net_cmt_send_started;
7960                 if (start_at == NULL) {
7961                         /* null so to beginning */
7962                         start_at = TAILQ_FIRST(&asoc->nets);
7963                 } else {
7964                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7965                         if (start_at == NULL) {
7966                                 start_at = TAILQ_FIRST(&asoc->nets);
7967                         }
7968                 }
7969                 asoc->last_net_cmt_send_started = start_at;
7970         } else {
7971                 start_at = TAILQ_FIRST(&asoc->nets);
7972         }
7973         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7974                 if (chk->whoTo == NULL) {
7975                         if (asoc->alternate) {
7976                                 chk->whoTo = asoc->alternate;
7977                         } else {
7978                                 chk->whoTo = asoc->primary_destination;
7979                         }
7980                         atomic_add_int(&chk->whoTo->ref_count, 1);
7981                 }
7982         }
7983         old_start_at = NULL;
7984 again_one_more_time:
7985         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7986                 /* how much can we send? */
7987                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7988                 if (old_start_at && (old_start_at == net)) {
7989                         /* through list ocmpletely. */
7990                         break;
7991                 }
7992                 tsns_sent = 0xa;
7993                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7994                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7995                     (net->flight_size >= net->cwnd)) {
7996                         /*
7997                          * Nothing on control or asconf and flight is full,
7998                          * we can skip even in the CMT case.
7999                          */
8000                         continue;
8001                 }
8002                 bundle_at = 0;
8003                 endoutchain = outchain = NULL;
8004                 no_fragmentflg = 1;
8005                 one_chunk = 0;
8006                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8007                         skip_data_for_this_net = 1;
8008                 } else {
8009                         skip_data_for_this_net = 0;
8010                 }
8011                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
8012                         /*
8013                          * if we have a route and an ifp check to see if we
8014                          * have room to send to this guy
8015                          */
8016                         struct ifnet *ifp;
8017
8018                         ifp = net->ro.ro_rt->rt_ifp;
8019                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
8020                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
8021                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
8022                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
8023                                 }
8024                                 continue;
8025                         }
8026                 }
8027                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8028 #ifdef INET
8029                 case AF_INET:
8030                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8031                         break;
8032 #endif
8033 #ifdef INET6
8034                 case AF_INET6:
8035                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8036                         break;
8037 #endif
8038                 default:
8039                         /* TSNH */
8040                         mtu = net->mtu;
8041                         break;
8042                 }
8043                 mx_mtu = mtu;
8044                 to_out = 0;
8045                 if (mtu > asoc->peers_rwnd) {
8046                         if (asoc->total_flight > 0) {
8047                                 /* We have a packet in flight somewhere */
8048                                 r_mtu = asoc->peers_rwnd;
8049                         } else {
8050                                 /* We are always allowed to send one MTU out */
8051                                 one_chunk = 1;
8052                                 r_mtu = mtu;
8053                         }
8054                 } else {
8055                         r_mtu = mtu;
8056                 }
8057                 /************************/
8058                 /* ASCONF transmission */
8059                 /************************/
8060                 /* Now first lets go through the asconf queue */
8061                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8062                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8063                                 continue;
8064                         }
8065                         if (chk->whoTo == NULL) {
8066                                 if (asoc->alternate == NULL) {
8067                                         if (asoc->primary_destination != net) {
8068                                                 break;
8069                                         }
8070                                 } else {
8071                                         if (asoc->alternate != net) {
8072                                                 break;
8073                                         }
8074                                 }
8075                         } else {
8076                                 if (chk->whoTo != net) {
8077                                         break;
8078                                 }
8079                         }
8080                         if (chk->data == NULL) {
8081                                 break;
8082                         }
8083                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8084                             chk->sent != SCTP_DATAGRAM_RESEND) {
8085                                 break;
8086                         }
8087                         /*
8088                          * if no AUTH is yet included and this chunk
8089                          * requires it, make sure to account for it.  We
8090                          * don't apply the size until the AUTH chunk is
8091                          * actually added below in case there is no room for
8092                          * this chunk. NOTE: we overload the use of "omtu"
8093                          * here
8094                          */
8095                         if ((auth == NULL) &&
8096                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8097                             stcb->asoc.peer_auth_chunks)) {
8098                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8099                         } else
8100                                 omtu = 0;
8101                         /* Here we do NOT factor the r_mtu */
8102                         if ((chk->send_size < (int)(mtu - omtu)) ||
8103                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8104                                 /*
8105                                  * We probably should glom the mbuf chain
8106                                  * from the chk->data for control but the
8107                                  * problem is it becomes yet one more level
8108                                  * of tracking to do if for some reason
8109                                  * output fails. Then I have got to
8110                                  * reconstruct the merged control chain.. el
8111                                  * yucko.. for now we take the easy way and
8112                                  * do the copy
8113                                  */
8114                                 /*
8115                                  * Add an AUTH chunk, if chunk requires it
8116                                  * save the offset into the chain for AUTH
8117                                  */
8118                                 if ((auth == NULL) &&
8119                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8120                                     stcb->asoc.peer_auth_chunks))) {
8121                                         outchain = sctp_add_auth_chunk(outchain,
8122                                             &endoutchain,
8123                                             &auth,
8124                                             &auth_offset,
8125                                             stcb,
8126                                             chk->rec.chunk_id.id);
8127                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8128                                 }
8129                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8130                                     (int)chk->rec.chunk_id.can_take_data,
8131                                     chk->send_size, chk->copy_by_ref);
8132                                 if (outchain == NULL) {
8133                                         *reason_code = 8;
8134                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8135                                         return (ENOMEM);
8136                                 }
8137                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8138                                 /* update our MTU size */
8139                                 if (mtu > (chk->send_size + omtu))
8140                                         mtu -= (chk->send_size + omtu);
8141                                 else
8142                                         mtu = 0;
8143                                 to_out += (chk->send_size + omtu);
8144                                 /* Do clear IP_DF ? */
8145                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8146                                         no_fragmentflg = 0;
8147                                 }
8148                                 if (chk->rec.chunk_id.can_take_data)
8149                                         chk->data = NULL;
8150                                 /*
8151                                  * set hb flag since we can use these for
8152                                  * RTO
8153                                  */
8154                                 hbflag = 1;
8155                                 asconf = 1;
8156                                 /*
8157                                  * should sysctl this: don't bundle data
8158                                  * with ASCONF since it requires AUTH
8159                                  */
8160                                 no_data_chunks = 1;
8161                                 chk->sent = SCTP_DATAGRAM_SENT;
8162                                 if (chk->whoTo == NULL) {
8163                                         chk->whoTo = net;
8164                                         atomic_add_int(&net->ref_count, 1);
8165                                 }
8166                                 chk->snd_count++;
8167                                 if (mtu == 0) {
8168                                         /*
8169                                          * Ok we are out of room but we can
8170                                          * output without effecting the
8171                                          * flight size since this little guy
8172                                          * is a control only packet.
8173                                          */
8174                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8175                                         /*
8176                                          * do NOT clear the asconf flag as
8177                                          * it is used to do appropriate
8178                                          * source address selection.
8179                                          */
8180                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8181                                             (struct sockaddr *)&net->ro._l_addr,
8182                                             outchain, auth_offset, auth,
8183                                             stcb->asoc.authinfo.active_keyid,
8184                                             no_fragmentflg, 0, asconf,
8185                                             inp->sctp_lport, stcb->rport,
8186                                             htonl(stcb->asoc.peer_vtag),
8187                                             net->port, NULL,
8188                                             0, 0,
8189                                             so_locked))) {
8190                                                 if (error == ENOBUFS) {
8191                                                         asoc->ifp_had_enobuf = 1;
8192                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8193                                                 }
8194                                                 if (from_where == 0) {
8195                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8196                                                 }
8197                                                 if (*now_filled == 0) {
8198                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8199                                                         *now_filled = 1;
8200                                                         *now = net->last_sent_time;
8201                                                 } else {
8202                                                         net->last_sent_time = *now;
8203                                                 }
8204                                                 hbflag = 0;
8205                                                 /* error, could not output */
8206                                                 if (error == EHOSTUNREACH) {
8207                                                         /*
8208                                                          * Destination went
8209                                                          * unreachable
8210                                                          * during this send
8211                                                          */
8212                                                         sctp_move_chunks_from_net(stcb, net);
8213                                                 }
8214                                                 *reason_code = 7;
8215                                                 continue;
8216                                         } else
8217                                                 asoc->ifp_had_enobuf = 0;
8218                                         if (*now_filled == 0) {
8219                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8220                                                 *now_filled = 1;
8221                                                 *now = net->last_sent_time;
8222                                         } else {
8223                                                 net->last_sent_time = *now;
8224                                         }
8225                                         hbflag = 0;
8226                                         /*
8227                                          * increase the number we sent, if a
8228                                          * cookie is sent we don't tell them
8229                                          * any was sent out.
8230                                          */
8231                                         outchain = endoutchain = NULL;
8232                                         auth = NULL;
8233                                         auth_offset = 0;
8234                                         if (!no_out_cnt)
8235                                                 *num_out += ctl_cnt;
8236                                         /* recalc a clean slate and setup */
8237                                         switch (net->ro._l_addr.sa.sa_family) {
8238 #ifdef INET
8239                                         case AF_INET:
8240                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8241                                                 break;
8242 #endif
8243 #ifdef INET6
8244                                         case AF_INET6:
8245                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8246                                                 break;
8247 #endif
8248                                         default:
8249                                                 /* TSNH */
8250                                                 mtu = net->mtu;
8251                                                 break;
8252                                         }
8253                                         to_out = 0;
8254                                         no_fragmentflg = 1;
8255                                 }
8256                         }
8257                 }
8258                 /************************/
8259                 /* Control transmission */
8260                 /************************/
8261                 /* Now first lets go through the control queue */
8262                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8263                         if ((sack_goes_to) &&
8264                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8265                             (chk->whoTo != sack_goes_to)) {
8266                                 /*
8267                                  * if we have a sack in queue, and we are
8268                                  * looking at an ecn echo that is NOT queued
8269                                  * to where the sack is going..
8270                                  */
8271                                 if (chk->whoTo == net) {
8272                                         /*
8273                                          * Don't transmit it to where its
8274                                          * going (current net)
8275                                          */
8276                                         continue;
8277                                 } else if (sack_goes_to == net) {
8278                                         /*
8279                                          * But do transmit it to this
8280                                          * address
8281                                          */
8282                                         goto skip_net_check;
8283                                 }
8284                         }
8285                         if (chk->whoTo == NULL) {
8286                                 if (asoc->alternate == NULL) {
8287                                         if (asoc->primary_destination != net) {
8288                                                 continue;
8289                                         }
8290                                 } else {
8291                                         if (asoc->alternate != net) {
8292                                                 continue;
8293                                         }
8294                                 }
8295                         } else {
8296                                 if (chk->whoTo != net) {
8297                                         continue;
8298                                 }
8299                         }
8300         skip_net_check:
8301                         if (chk->data == NULL) {
8302                                 continue;
8303                         }
8304                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8305                                 /*
8306                                  * It must be unsent. Cookies and ASCONF's
8307                                  * hang around but there timers will force
8308                                  * when marked for resend.
8309                                  */
8310                                 continue;
8311                         }
8312                         /*
8313                          * if no AUTH is yet included and this chunk
8314                          * requires it, make sure to account for it.  We
8315                          * don't apply the size until the AUTH chunk is
8316                          * actually added below in case there is no room for
8317                          * this chunk. NOTE: we overload the use of "omtu"
8318                          * here
8319                          */
8320                         if ((auth == NULL) &&
8321                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8322                             stcb->asoc.peer_auth_chunks)) {
8323                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8324                         } else
8325                                 omtu = 0;
8326                         /* Here we do NOT factor the r_mtu */
8327                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8328                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8329                                 /*
8330                                  * We probably should glom the mbuf chain
8331                                  * from the chk->data for control but the
8332                                  * problem is it becomes yet one more level
8333                                  * of tracking to do if for some reason
8334                                  * output fails. Then I have got to
8335                                  * reconstruct the merged control chain.. el
8336                                  * yucko.. for now we take the easy way and
8337                                  * do the copy
8338                                  */
8339                                 /*
8340                                  * Add an AUTH chunk, if chunk requires it
8341                                  * save the offset into the chain for AUTH
8342                                  */
8343                                 if ((auth == NULL) &&
8344                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8345                                     stcb->asoc.peer_auth_chunks))) {
8346                                         outchain = sctp_add_auth_chunk(outchain,
8347                                             &endoutchain,
8348                                             &auth,
8349                                             &auth_offset,
8350                                             stcb,
8351                                             chk->rec.chunk_id.id);
8352                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8353                                 }
8354                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8355                                     (int)chk->rec.chunk_id.can_take_data,
8356                                     chk->send_size, chk->copy_by_ref);
8357                                 if (outchain == NULL) {
8358                                         *reason_code = 8;
8359                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8360                                         return (ENOMEM);
8361                                 }
8362                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8363                                 /* update our MTU size */
8364                                 if (mtu > (chk->send_size + omtu))
8365                                         mtu -= (chk->send_size + omtu);
8366                                 else
8367                                         mtu = 0;
8368                                 to_out += (chk->send_size + omtu);
8369                                 /* Do clear IP_DF ? */
8370                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8371                                         no_fragmentflg = 0;
8372                                 }
8373                                 if (chk->rec.chunk_id.can_take_data)
8374                                         chk->data = NULL;
8375                                 /* Mark things to be removed, if needed */
8376                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8377                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8378                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8379                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8380                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8381                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8382                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8383                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8384                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8385                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8386                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8387                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8388                                                 hbflag = 1;
8389                                         }
8390                                         /* remove these chunks at the end */
8391                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8392                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8393                                                 /* turn off the timer */
8394                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8395                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8396                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8397                                                 }
8398                                         }
8399                                         ctl_cnt++;
8400                                 } else {
8401                                         /*
8402                                          * Other chunks, since they have
8403                                          * timers running (i.e. COOKIE) we
8404                                          * just "trust" that it gets sent or
8405                                          * retransmitted.
8406                                          */
8407                                         ctl_cnt++;
8408                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8409                                                 cookie = 1;
8410                                                 no_out_cnt = 1;
8411                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8412                                                 /*
8413                                                  * Increment ecne send count
8414                                                  * here this means we may be
8415                                                  * over-zealous in our
8416                                                  * counting if the send
8417                                                  * fails, but its the best
8418                                                  * place to do it (we used
8419                                                  * to do it in the queue of
8420                                                  * the chunk, but that did
8421                                                  * not tell how many times
8422                                                  * it was sent.
8423                                                  */
8424                                                 SCTP_STAT_INCR(sctps_sendecne);
8425                                         }
8426                                         chk->sent = SCTP_DATAGRAM_SENT;
8427                                         if (chk->whoTo == NULL) {
8428                                                 chk->whoTo = net;
8429                                                 atomic_add_int(&net->ref_count, 1);
8430                                         }
8431                                         chk->snd_count++;
8432                                 }
8433                                 if (mtu == 0) {
8434                                         /*
8435                                          * Ok we are out of room but we can
8436                                          * output without effecting the
8437                                          * flight size since this little guy
8438                                          * is a control only packet.
8439                                          */
8440                                         if (asconf) {
8441                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8442                                                 /*
8443                                                  * do NOT clear the asconf
8444                                                  * flag as it is used to do
8445                                                  * appropriate source
8446                                                  * address selection.
8447                                                  */
8448                                         }
8449                                         if (cookie) {
8450                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8451                                                 cookie = 0;
8452                                         }
8453                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8454                                             (struct sockaddr *)&net->ro._l_addr,
8455                                             outchain,
8456                                             auth_offset, auth,
8457                                             stcb->asoc.authinfo.active_keyid,
8458                                             no_fragmentflg, 0, asconf,
8459                                             inp->sctp_lport, stcb->rport,
8460                                             htonl(stcb->asoc.peer_vtag),
8461                                             net->port, NULL,
8462                                             0, 0,
8463                                             so_locked))) {
8464                                                 if (error == ENOBUFS) {
8465                                                         asoc->ifp_had_enobuf = 1;
8466                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8467                                                 }
8468                                                 if (from_where == 0) {
8469                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8470                                                 }
8471                                                 /* error, could not output */
8472                                                 if (hbflag) {
8473                                                         if (*now_filled == 0) {
8474                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8475                                                                 *now_filled = 1;
8476                                                                 *now = net->last_sent_time;
8477                                                         } else {
8478                                                                 net->last_sent_time = *now;
8479                                                         }
8480                                                         hbflag = 0;
8481                                                 }
8482                                                 if (error == EHOSTUNREACH) {
8483                                                         /*
8484                                                          * Destination went
8485                                                          * unreachable
8486                                                          * during this send
8487                                                          */
8488                                                         sctp_move_chunks_from_net(stcb, net);
8489                                                 }
8490                                                 *reason_code = 7;
8491                                                 continue;
8492                                         } else
8493                                                 asoc->ifp_had_enobuf = 0;
8494                                         /* Only HB or ASCONF advances time */
8495                                         if (hbflag) {
8496                                                 if (*now_filled == 0) {
8497                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8498                                                         *now_filled = 1;
8499                                                         *now = net->last_sent_time;
8500                                                 } else {
8501                                                         net->last_sent_time = *now;
8502                                                 }
8503                                                 hbflag = 0;
8504                                         }
8505                                         /*
8506                                          * increase the number we sent, if a
8507                                          * cookie is sent we don't tell them
8508                                          * any was sent out.
8509                                          */
8510                                         outchain = endoutchain = NULL;
8511                                         auth = NULL;
8512                                         auth_offset = 0;
8513                                         if (!no_out_cnt)
8514                                                 *num_out += ctl_cnt;
8515                                         /* recalc a clean slate and setup */
8516                                         switch (net->ro._l_addr.sa.sa_family) {
8517 #ifdef INET
8518                                         case AF_INET:
8519                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8520                                                 break;
8521 #endif
8522 #ifdef INET6
8523                                         case AF_INET6:
8524                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8525                                                 break;
8526 #endif
8527                                         default:
8528                                                 /* TSNH */
8529                                                 mtu = net->mtu;
8530                                                 break;
8531                                         }
8532                                         to_out = 0;
8533                                         no_fragmentflg = 1;
8534                                 }
8535                         }
8536                 }
8537                 /* JRI: if dest is in PF state, do not send data to it */
8538                 if ((asoc->sctp_cmt_on_off > 0) &&
8539                     (net != stcb->asoc.alternate) &&
8540                     (net->dest_state & SCTP_ADDR_PF)) {
8541                         goto no_data_fill;
8542                 }
8543                 if (net->flight_size >= net->cwnd) {
8544                         goto no_data_fill;
8545                 }
8546                 if ((asoc->sctp_cmt_on_off > 0) &&
8547                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8548                     (net->flight_size > max_rwnd_per_dest)) {
8549                         goto no_data_fill;
8550                 }
8551                 /*
8552                  * We need a specific accounting for the usage of the send
8553                  * buffer. We also need to check the number of messages per
8554                  * net. For now, this is better than nothing and it disabled
8555                  * by default...
8556                  */
8557                 if ((asoc->sctp_cmt_on_off > 0) &&
8558                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8559                     (max_send_per_dest > 0) &&
8560                     (net->flight_size > max_send_per_dest)) {
8561                         goto no_data_fill;
8562                 }
8563                 /*********************/
8564                 /* Data transmission */
8565                 /*********************/
8566                 /*
8567                  * if AUTH for DATA is required and no AUTH has been added
8568                  * yet, account for this in the mtu now... if no data can be
8569                  * bundled, this adjustment won't matter anyways since the
8570                  * packet will be going out...
8571                  */
8572                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8573                     stcb->asoc.peer_auth_chunks);
8574                 if (data_auth_reqd && (auth == NULL)) {
8575                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8576                 }
8577                 /* now lets add any data within the MTU constraints */
8578                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8579 #ifdef INET
8580                 case AF_INET:
8581                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8582                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8583                         else
8584                                 omtu = 0;
8585                         break;
8586 #endif
8587 #ifdef INET6
8588                 case AF_INET6:
8589                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8590                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8591                         else
8592                                 omtu = 0;
8593                         break;
8594 #endif
8595                 default:
8596                         /* TSNH */
8597                         omtu = 0;
8598                         break;
8599                 }
8600                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8601                     (skip_data_for_this_net == 0)) ||
8602                     (cookie)) {
8603                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8604                                 if (no_data_chunks) {
8605                                         /* let only control go out */
8606                                         *reason_code = 1;
8607                                         break;
8608                                 }
8609                                 if (net->flight_size >= net->cwnd) {
8610                                         /* skip this net, no room for data */
8611                                         *reason_code = 2;
8612                                         break;
8613                                 }
8614                                 if ((chk->whoTo != NULL) &&
8615                                     (chk->whoTo != net)) {
8616                                         /* Don't send the chunk on this net */
8617                                         continue;
8618                                 }
8619                                 if (asoc->sctp_cmt_on_off == 0) {
8620                                         if ((asoc->alternate) &&
8621                                             (asoc->alternate != net) &&
8622                                             (chk->whoTo == NULL)) {
8623                                                 continue;
8624                                         } else if ((net != asoc->primary_destination) &&
8625                                                     (asoc->alternate == NULL) &&
8626                                             (chk->whoTo == NULL)) {
8627                                                 continue;
8628                                         }
8629                                 }
8630                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8631                                         /*-
8632                                          * strange, we have a chunk that is
8633                                          * to big for its destination and
8634                                          * yet no fragment ok flag.
8635                                          * Something went wrong when the
8636                                          * PMTU changed...we did not mark
8637                                          * this chunk for some reason?? I
8638                                          * will fix it here by letting IP
8639                                          * fragment it for now and printing
8640                                          * a warning. This really should not
8641                                          * happen ...
8642                                          */
8643                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8644                                             chk->send_size, mtu);
8645                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8646                                 }
8647                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8648                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8649                                         struct sctp_data_chunk *dchkh;
8650
8651                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8652                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8653                                 }
8654                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8655                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8656                                         /* ok we will add this one */
8657
8658                                         /*
8659                                          * Add an AUTH chunk, if chunk
8660                                          * requires it, save the offset into
8661                                          * the chain for AUTH
8662                                          */
8663                                         if (data_auth_reqd) {
8664                                                 if (auth == NULL) {
8665                                                         outchain = sctp_add_auth_chunk(outchain,
8666                                                             &endoutchain,
8667                                                             &auth,
8668                                                             &auth_offset,
8669                                                             stcb,
8670                                                             SCTP_DATA);
8671                                                         auth_keyid = chk->auth_keyid;
8672                                                         override_ok = 0;
8673                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8674                                                 } else if (override_ok) {
8675                                                         /*
8676                                                          * use this data's
8677                                                          * keyid
8678                                                          */
8679                                                         auth_keyid = chk->auth_keyid;
8680                                                         override_ok = 0;
8681                                                 } else if (auth_keyid != chk->auth_keyid) {
8682                                                         /*
8683                                                          * different keyid,
8684                                                          * so done bundling
8685                                                          */
8686                                                         break;
8687                                                 }
8688                                         }
8689                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8690                                             chk->send_size, chk->copy_by_ref);
8691                                         if (outchain == NULL) {
8692                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8693                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8694                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8695                                                 }
8696                                                 *reason_code = 3;
8697                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8698                                                 return (ENOMEM);
8699                                         }
8700                                         /* upate our MTU size */
8701                                         /* Do clear IP_DF ? */
8702                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8703                                                 no_fragmentflg = 0;
8704                                         }
8705                                         /* unsigned subtraction of mtu */
8706                                         if (mtu > chk->send_size)
8707                                                 mtu -= chk->send_size;
8708                                         else
8709                                                 mtu = 0;
8710                                         /* unsigned subtraction of r_mtu */
8711                                         if (r_mtu > chk->send_size)
8712                                                 r_mtu -= chk->send_size;
8713                                         else
8714                                                 r_mtu = 0;
8715
8716                                         to_out += chk->send_size;
8717                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8718 #ifdef INVARIANTS
8719                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8720 #else
8721                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8722                                                     mx_mtu, to_out);
8723 #endif
8724                                         }
8725                                         chk->window_probe = 0;
8726                                         data_list[bundle_at++] = chk;
8727                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8728                                                 break;
8729                                         }
8730                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8731                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8732                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8733                                                 } else {
8734                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8735                                                 }
8736                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8737                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8738                                                         /*
8739                                                          * Count number of
8740                                                          * user msg's that
8741                                                          * were fragmented
8742                                                          * we do this by
8743                                                          * counting when we
8744                                                          * see a LAST
8745                                                          * fragment only.
8746                                                          */
8747                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8748                                         }
8749                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8750                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8751                                                         data_list[0]->window_probe = 1;
8752                                                         net->window_probe = 1;
8753                                                 }
8754                                                 break;
8755                                         }
8756                                 } else {
8757                                         /*
8758                                          * Must be sent in order of the
8759                                          * TSN's (on a network)
8760                                          */
8761                                         break;
8762                                 }
8763                         }       /* for (chunk gather loop for this net) */
8764                 }               /* if asoc.state OPEN */
8765 no_data_fill:
8766                 /* Is there something to send for this destination? */
8767                 if (outchain) {
8768                         /* We may need to start a control timer or two */
8769                         if (asconf) {
8770                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8771                                     stcb, net);
8772                                 /*
8773                                  * do NOT clear the asconf flag as it is
8774                                  * used to do appropriate source address
8775                                  * selection.
8776                                  */
8777                         }
8778                         if (cookie) {
8779                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8780                                 cookie = 0;
8781                         }
8782                         /* must start a send timer if data is being sent */
8783                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8784                                 /*
8785                                  * no timer running on this destination
8786                                  * restart it.
8787                                  */
8788                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8789                         }
8790                         /* Now send it, if there is anything to send :> */
8791                         if ((error = sctp_lowlevel_chunk_output(inp,
8792                             stcb,
8793                             net,
8794                             (struct sockaddr *)&net->ro._l_addr,
8795                             outchain,
8796                             auth_offset,
8797                             auth,
8798                             auth_keyid,
8799                             no_fragmentflg,
8800                             bundle_at,
8801                             asconf,
8802                             inp->sctp_lport, stcb->rport,
8803                             htonl(stcb->asoc.peer_vtag),
8804                             net->port, NULL,
8805                             0, 0,
8806                             so_locked))) {
8807                                 /* error, we could not output */
8808                                 if (error == ENOBUFS) {
8809                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8810                                         asoc->ifp_had_enobuf = 1;
8811                                 }
8812                                 if (from_where == 0) {
8813                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8814                                 }
8815                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8816                                 if (hbflag) {
8817                                         if (*now_filled == 0) {
8818                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8819                                                 *now_filled = 1;
8820                                                 *now = net->last_sent_time;
8821                                         } else {
8822                                                 net->last_sent_time = *now;
8823                                         }
8824                                         hbflag = 0;
8825                                 }
8826                                 if (error == EHOSTUNREACH) {
8827                                         /*
8828                                          * Destination went unreachable
8829                                          * during this send
8830                                          */
8831                                         sctp_move_chunks_from_net(stcb, net);
8832                                 }
8833                                 *reason_code = 6;
8834                                 /*-
8835                                  * I add this line to be paranoid. As far as
8836                                  * I can tell the continue, takes us back to
8837                                  * the top of the for, but just to make sure
8838                                  * I will reset these again here.
8839                                  */
8840                                 ctl_cnt = bundle_at = 0;
8841                                 continue;       /* This takes us back to the
8842                                                  * for() for the nets. */
8843                         } else {
8844                                 asoc->ifp_had_enobuf = 0;
8845                         }
8846                         endoutchain = NULL;
8847                         auth = NULL;
8848                         auth_offset = 0;
8849                         if (bundle_at || hbflag) {
8850                                 /* For data/asconf and hb set time */
8851                                 if (*now_filled == 0) {
8852                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8853                                         *now_filled = 1;
8854                                         *now = net->last_sent_time;
8855                                 } else {
8856                                         net->last_sent_time = *now;
8857                                 }
8858                         }
8859                         if (!no_out_cnt) {
8860                                 *num_out += (ctl_cnt + bundle_at);
8861                         }
8862                         if (bundle_at) {
8863                                 /* setup for a RTO measurement */
8864                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8865                                 /* fill time if not already filled */
8866                                 if (*now_filled == 0) {
8867                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8868                                         *now_filled = 1;
8869                                         *now = asoc->time_last_sent;
8870                                 } else {
8871                                         asoc->time_last_sent = *now;
8872                                 }
8873                                 if (net->rto_needed) {
8874                                         data_list[0]->do_rtt = 1;
8875                                         net->rto_needed = 0;
8876                                 }
8877                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8878                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8879                         }
8880                         if (one_chunk) {
8881                                 break;
8882                         }
8883                 }
8884                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8885                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8886                 }
8887         }
8888         if (old_start_at == NULL) {
8889                 old_start_at = start_at;
8890                 start_at = TAILQ_FIRST(&asoc->nets);
8891                 if (old_start_at)
8892                         goto again_one_more_time;
8893         }
8894         /*
8895          * At the end there should be no NON timed chunks hanging on this
8896          * queue.
8897          */
8898         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8899                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8900         }
8901         if ((*num_out == 0) && (*reason_code == 0)) {
8902                 *reason_code = 4;
8903         } else {
8904                 *reason_code = 5;
8905         }
8906         sctp_clean_up_ctl(stcb, asoc, so_locked);
8907         return (0);
8908 }
8909
8910 void
8911 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8912 {
8913         /*-
8914          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8915          * the control chunk queue.
8916          */
8917         struct sctp_chunkhdr *hdr;
8918         struct sctp_tmit_chunk *chk;
8919         struct mbuf *mat;
8920
8921         SCTP_TCB_LOCK_ASSERT(stcb);
8922         sctp_alloc_a_chunk(stcb, chk);
8923         if (chk == NULL) {
8924                 /* no memory */
8925                 sctp_m_freem(op_err);
8926                 return;
8927         }
8928         chk->copy_by_ref = 0;
8929         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8930         if (op_err == NULL) {
8931                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8932                 return;
8933         }
8934         chk->send_size = 0;
8935         mat = op_err;
8936         while (mat != NULL) {
8937                 chk->send_size += SCTP_BUF_LEN(mat);
8938                 mat = SCTP_BUF_NEXT(mat);
8939         }
8940         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8941         chk->rec.chunk_id.can_take_data = 1;
8942         chk->sent = SCTP_DATAGRAM_UNSENT;
8943         chk->snd_count = 0;
8944         chk->flags = 0;
8945         chk->asoc = &stcb->asoc;
8946         chk->data = op_err;
8947         chk->whoTo = NULL;
8948         hdr = mtod(op_err, struct sctp_chunkhdr *);
8949         hdr->chunk_type = SCTP_OPERATION_ERROR;
8950         hdr->chunk_flags = 0;
8951         hdr->chunk_length = htons(chk->send_size);
8952         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8953             chk,
8954             sctp_next);
8955         chk->asoc->ctrl_queue_cnt++;
8956 }
8957
8958 int
8959 sctp_send_cookie_echo(struct mbuf *m,
8960     int offset,
8961     struct sctp_tcb *stcb,
8962     struct sctp_nets *net)
8963 {
8964         /*-
8965          * pull out the cookie and put it at the front of the control chunk
8966          * queue.
8967          */
8968         int at;
8969         struct mbuf *cookie;
8970         struct sctp_paramhdr parm, *phdr;
8971         struct sctp_chunkhdr *hdr;
8972         struct sctp_tmit_chunk *chk;
8973         uint16_t ptype, plen;
8974
8975         /* First find the cookie in the param area */
8976         cookie = NULL;
8977         at = offset + sizeof(struct sctp_init_chunk);
8978
8979         SCTP_TCB_LOCK_ASSERT(stcb);
8980         do {
8981                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8982                 if (phdr == NULL) {
8983                         return (-3);
8984                 }
8985                 ptype = ntohs(phdr->param_type);
8986                 plen = ntohs(phdr->param_length);
8987                 if (ptype == SCTP_STATE_COOKIE) {
8988                         int pad;
8989
8990                         /* found the cookie */
8991                         if ((pad = (plen % 4))) {
8992                                 plen += 4 - pad;
8993                         }
8994                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8995                         if (cookie == NULL) {
8996                                 /* No memory */
8997                                 return (-2);
8998                         }
8999 #ifdef SCTP_MBUF_LOGGING
9000                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9001                                 struct mbuf *mat;
9002
9003                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
9004                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9005                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9006                                         }
9007                                 }
9008                         }
9009 #endif
9010                         break;
9011                 }
9012                 at += SCTP_SIZE32(plen);
9013         } while (phdr);
9014         if (cookie == NULL) {
9015                 /* Did not find the cookie */
9016                 return (-3);
9017         }
9018         /* ok, we got the cookie lets change it into a cookie echo chunk */
9019
9020         /* first the change from param to cookie */
9021         hdr = mtod(cookie, struct sctp_chunkhdr *);
9022         hdr->chunk_type = SCTP_COOKIE_ECHO;
9023         hdr->chunk_flags = 0;
9024         /* get the chunk stuff now and place it in the FRONT of the queue */
9025         sctp_alloc_a_chunk(stcb, chk);
9026         if (chk == NULL) {
9027                 /* no memory */
9028                 sctp_m_freem(cookie);
9029                 return (-5);
9030         }
9031         chk->copy_by_ref = 0;
9032         chk->send_size = plen;
9033         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9034         chk->rec.chunk_id.can_take_data = 0;
9035         chk->sent = SCTP_DATAGRAM_UNSENT;
9036         chk->snd_count = 0;
9037         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9038         chk->asoc = &stcb->asoc;
9039         chk->data = cookie;
9040         chk->whoTo = net;
9041         atomic_add_int(&chk->whoTo->ref_count, 1);
9042         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9043         chk->asoc->ctrl_queue_cnt++;
9044         return (0);
9045 }
9046
9047 void
9048 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9049     struct mbuf *m,
9050     int offset,
9051     int chk_length,
9052     struct sctp_nets *net)
9053 {
9054         /*
9055          * take a HB request and make it into a HB ack and send it.
9056          */
9057         struct mbuf *outchain;
9058         struct sctp_chunkhdr *chdr;
9059         struct sctp_tmit_chunk *chk;
9060
9061
9062         if (net == NULL)
9063                 /* must have a net pointer */
9064                 return;
9065
9066         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9067         if (outchain == NULL) {
9068                 /* gak out of memory */
9069                 return;
9070         }
9071 #ifdef SCTP_MBUF_LOGGING
9072         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9073                 struct mbuf *mat;
9074
9075                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9076                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9077                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9078                         }
9079                 }
9080         }
9081 #endif
9082         chdr = mtod(outchain, struct sctp_chunkhdr *);
9083         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9084         chdr->chunk_flags = 0;
9085         if (chk_length % 4) {
9086                 /* need pad */
9087                 uint32_t cpthis = 0;
9088                 int padlen;
9089
9090                 padlen = 4 - (chk_length % 4);
9091                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9092         }
9093         sctp_alloc_a_chunk(stcb, chk);
9094         if (chk == NULL) {
9095                 /* no memory */
9096                 sctp_m_freem(outchain);
9097                 return;
9098         }
9099         chk->copy_by_ref = 0;
9100         chk->send_size = chk_length;
9101         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9102         chk->rec.chunk_id.can_take_data = 1;
9103         chk->sent = SCTP_DATAGRAM_UNSENT;
9104         chk->snd_count = 0;
9105         chk->flags = 0;
9106         chk->asoc = &stcb->asoc;
9107         chk->data = outchain;
9108         chk->whoTo = net;
9109         atomic_add_int(&chk->whoTo->ref_count, 1);
9110         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9111         chk->asoc->ctrl_queue_cnt++;
9112 }
9113
9114 void
9115 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9116 {
9117         /* formulate and queue a cookie-ack back to sender */
9118         struct mbuf *cookie_ack;
9119         struct sctp_chunkhdr *hdr;
9120         struct sctp_tmit_chunk *chk;
9121
9122         SCTP_TCB_LOCK_ASSERT(stcb);
9123
9124         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9125         if (cookie_ack == NULL) {
9126                 /* no mbuf's */
9127                 return;
9128         }
9129         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9130         sctp_alloc_a_chunk(stcb, chk);
9131         if (chk == NULL) {
9132                 /* no memory */
9133                 sctp_m_freem(cookie_ack);
9134                 return;
9135         }
9136         chk->copy_by_ref = 0;
9137         chk->send_size = sizeof(struct sctp_chunkhdr);
9138         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9139         chk->rec.chunk_id.can_take_data = 1;
9140         chk->sent = SCTP_DATAGRAM_UNSENT;
9141         chk->snd_count = 0;
9142         chk->flags = 0;
9143         chk->asoc = &stcb->asoc;
9144         chk->data = cookie_ack;
9145         if (chk->asoc->last_control_chunk_from != NULL) {
9146                 chk->whoTo = chk->asoc->last_control_chunk_from;
9147                 atomic_add_int(&chk->whoTo->ref_count, 1);
9148         } else {
9149                 chk->whoTo = NULL;
9150         }
9151         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9152         hdr->chunk_type = SCTP_COOKIE_ACK;
9153         hdr->chunk_flags = 0;
9154         hdr->chunk_length = htons(chk->send_size);
9155         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9156         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9157         chk->asoc->ctrl_queue_cnt++;
9158         return;
9159 }
9160
9161
9162 void
9163 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9164 {
9165         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9166         struct mbuf *m_shutdown_ack;
9167         struct sctp_shutdown_ack_chunk *ack_cp;
9168         struct sctp_tmit_chunk *chk;
9169
9170         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9171         if (m_shutdown_ack == NULL) {
9172                 /* no mbuf's */
9173                 return;
9174         }
9175         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9176         sctp_alloc_a_chunk(stcb, chk);
9177         if (chk == NULL) {
9178                 /* no memory */
9179                 sctp_m_freem(m_shutdown_ack);
9180                 return;
9181         }
9182         chk->copy_by_ref = 0;
9183         chk->send_size = sizeof(struct sctp_chunkhdr);
9184         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9185         chk->rec.chunk_id.can_take_data = 1;
9186         chk->sent = SCTP_DATAGRAM_UNSENT;
9187         chk->snd_count = 0;
9188         chk->flags = 0;
9189         chk->asoc = &stcb->asoc;
9190         chk->data = m_shutdown_ack;
9191         chk->whoTo = net;
9192         if (chk->whoTo) {
9193                 atomic_add_int(&chk->whoTo->ref_count, 1);
9194         }
9195         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9196         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9197         ack_cp->ch.chunk_flags = 0;
9198         ack_cp->ch.chunk_length = htons(chk->send_size);
9199         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9200         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9201         chk->asoc->ctrl_queue_cnt++;
9202         return;
9203 }
9204
9205 void
9206 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9207 {
9208         /* formulate and queue a SHUTDOWN to the sender */
9209         struct mbuf *m_shutdown;
9210         struct sctp_shutdown_chunk *shutdown_cp;
9211         struct sctp_tmit_chunk *chk;
9212
9213         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9214         if (m_shutdown == NULL) {
9215                 /* no mbuf's */
9216                 return;
9217         }
9218         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9219         sctp_alloc_a_chunk(stcb, chk);
9220         if (chk == NULL) {
9221                 /* no memory */
9222                 sctp_m_freem(m_shutdown);
9223                 return;
9224         }
9225         chk->copy_by_ref = 0;
9226         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9227         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9228         chk->rec.chunk_id.can_take_data = 1;
9229         chk->sent = SCTP_DATAGRAM_UNSENT;
9230         chk->snd_count = 0;
9231         chk->flags = 0;
9232         chk->asoc = &stcb->asoc;
9233         chk->data = m_shutdown;
9234         chk->whoTo = net;
9235         if (chk->whoTo) {
9236                 atomic_add_int(&chk->whoTo->ref_count, 1);
9237         }
9238         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9239         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9240         shutdown_cp->ch.chunk_flags = 0;
9241         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9242         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9243         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9244         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9245         chk->asoc->ctrl_queue_cnt++;
9246         return;
9247 }
9248
9249 void
9250 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9251 {
9252         /*
9253          * formulate and queue an ASCONF to the peer. ASCONF parameters
9254          * should be queued on the assoc queue.
9255          */
9256         struct sctp_tmit_chunk *chk;
9257         struct mbuf *m_asconf;
9258         int len;
9259
9260         SCTP_TCB_LOCK_ASSERT(stcb);
9261
9262         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9263             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9264                 /* can't send a new one if there is one in flight already */
9265                 return;
9266         }
9267         /* compose an ASCONF chunk, maximum length is PMTU */
9268         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9269         if (m_asconf == NULL) {
9270                 return;
9271         }
9272         sctp_alloc_a_chunk(stcb, chk);
9273         if (chk == NULL) {
9274                 /* no memory */
9275                 sctp_m_freem(m_asconf);
9276                 return;
9277         }
9278         chk->copy_by_ref = 0;
9279         chk->data = m_asconf;
9280         chk->send_size = len;
9281         chk->rec.chunk_id.id = SCTP_ASCONF;
9282         chk->rec.chunk_id.can_take_data = 0;
9283         chk->sent = SCTP_DATAGRAM_UNSENT;
9284         chk->snd_count = 0;
9285         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9286         chk->asoc = &stcb->asoc;
9287         chk->whoTo = net;
9288         if (chk->whoTo) {
9289                 atomic_add_int(&chk->whoTo->ref_count, 1);
9290         }
9291         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9292         chk->asoc->ctrl_queue_cnt++;
9293         return;
9294 }
9295
9296 void
9297 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9298 {
9299         /*
9300          * formulate and queue a asconf-ack back to sender. the asconf-ack
9301          * must be stored in the tcb.
9302          */
9303         struct sctp_tmit_chunk *chk;
9304         struct sctp_asconf_ack *ack, *latest_ack;
9305         struct mbuf *m_ack;
9306         struct sctp_nets *net = NULL;
9307
9308         SCTP_TCB_LOCK_ASSERT(stcb);
9309         /* Get the latest ASCONF-ACK */
9310         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9311         if (latest_ack == NULL) {
9312                 return;
9313         }
9314         if (latest_ack->last_sent_to != NULL &&
9315             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9316                 /* we're doing a retransmission */
9317                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9318                 if (net == NULL) {
9319                         /* no alternate */
9320                         if (stcb->asoc.last_control_chunk_from == NULL) {
9321                                 if (stcb->asoc.alternate) {
9322                                         net = stcb->asoc.alternate;
9323                                 } else {
9324                                         net = stcb->asoc.primary_destination;
9325                                 }
9326                         } else {
9327                                 net = stcb->asoc.last_control_chunk_from;
9328                         }
9329                 }
9330         } else {
9331                 /* normal case */
9332                 if (stcb->asoc.last_control_chunk_from == NULL) {
9333                         if (stcb->asoc.alternate) {
9334                                 net = stcb->asoc.alternate;
9335                         } else {
9336                                 net = stcb->asoc.primary_destination;
9337                         }
9338                 } else {
9339                         net = stcb->asoc.last_control_chunk_from;
9340                 }
9341         }
9342         latest_ack->last_sent_to = net;
9343
9344         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9345                 if (ack->data == NULL) {
9346                         continue;
9347                 }
9348                 /* copy the asconf_ack */
9349                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9350                 if (m_ack == NULL) {
9351                         /* couldn't copy it */
9352                         return;
9353                 }
9354 #ifdef SCTP_MBUF_LOGGING
9355                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9356                         struct mbuf *mat;
9357
9358                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9359                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9360                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9361                                 }
9362                         }
9363                 }
9364 #endif
9365
9366                 sctp_alloc_a_chunk(stcb, chk);
9367                 if (chk == NULL) {
9368                         /* no memory */
9369                         if (m_ack)
9370                                 sctp_m_freem(m_ack);
9371                         return;
9372                 }
9373                 chk->copy_by_ref = 0;
9374
9375                 chk->whoTo = net;
9376                 if (chk->whoTo) {
9377                         atomic_add_int(&chk->whoTo->ref_count, 1);
9378                 }
9379                 chk->data = m_ack;
9380                 chk->send_size = 0;
9381                 /* Get size */
9382                 chk->send_size = ack->len;
9383                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9384                 chk->rec.chunk_id.can_take_data = 1;
9385                 chk->sent = SCTP_DATAGRAM_UNSENT;
9386                 chk->snd_count = 0;
9387                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9388                 chk->asoc = &stcb->asoc;
9389
9390                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9391                 chk->asoc->ctrl_queue_cnt++;
9392         }
9393         return;
9394 }
9395
9396
9397 static int
9398 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9399     struct sctp_tcb *stcb,
9400     struct sctp_association *asoc,
9401     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9402 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9403     SCTP_UNUSED
9404 #endif
9405 )
9406 {
9407         /*-
9408          * send out one MTU of retransmission. If fast_retransmit is
9409          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9410          * rwnd. For a Cookie or Asconf in the control chunk queue we
9411          * retransmit them by themselves.
9412          *
9413          * For data chunks we will pick out the lowest TSN's in the sent_queue
9414          * marked for resend and bundle them all together (up to a MTU of
9415          * destination). The address to send to should have been
9416          * selected/changed where the retransmission was marked (i.e. in FR
9417          * or t3-timeout routines).
9418          */
9419         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9420         struct sctp_tmit_chunk *chk, *fwd;
9421         struct mbuf *m, *endofchain;
9422         struct sctp_nets *net = NULL;
9423         uint32_t tsns_sent = 0;
9424         int no_fragmentflg, bundle_at, cnt_thru;
9425         unsigned int mtu;
9426         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9427         struct sctp_auth_chunk *auth = NULL;
9428         uint32_t auth_offset = 0;
9429         uint16_t auth_keyid;
9430         int override_ok = 1;
9431         int data_auth_reqd = 0;
9432         uint32_t dmtu = 0;
9433
9434         SCTP_TCB_LOCK_ASSERT(stcb);
9435         tmr_started = ctl_cnt = bundle_at = error = 0;
9436         no_fragmentflg = 1;
9437         fwd_tsn = 0;
9438         *cnt_out = 0;
9439         fwd = NULL;
9440         endofchain = m = NULL;
9441         auth_keyid = stcb->asoc.authinfo.active_keyid;
9442 #ifdef SCTP_AUDITING_ENABLED
9443         sctp_audit_log(0xC3, 1);
9444 #endif
9445         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9446             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9447                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9448                     asoc->sent_queue_retran_cnt);
9449                 asoc->sent_queue_cnt = 0;
9450                 asoc->sent_queue_cnt_removeable = 0;
9451                 /* send back 0/0 so we enter normal transmission */
9452                 *cnt_out = 0;
9453                 return (0);
9454         }
9455         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9456                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9457                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9458                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9459                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9460                                 continue;
9461                         }
9462                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9463                                 if (chk != asoc->str_reset) {
9464                                         /*
9465                                          * not eligible for retran if its
9466                                          * not ours
9467                                          */
9468                                         continue;
9469                                 }
9470                         }
9471                         ctl_cnt++;
9472                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9473                                 fwd_tsn = 1;
9474                         }
9475                         /*
9476                          * Add an AUTH chunk, if chunk requires it save the
9477                          * offset into the chain for AUTH
9478                          */
9479                         if ((auth == NULL) &&
9480                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9481                             stcb->asoc.peer_auth_chunks))) {
9482                                 m = sctp_add_auth_chunk(m, &endofchain,
9483                                     &auth, &auth_offset,
9484                                     stcb,
9485                                     chk->rec.chunk_id.id);
9486                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9487                         }
9488                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9489                         break;
9490                 }
9491         }
9492         one_chunk = 0;
9493         cnt_thru = 0;
9494         /* do we have control chunks to retransmit? */
9495         if (m != NULL) {
9496                 /* Start a timer no matter if we suceed or fail */
9497                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9498                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9499                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9500                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9501                 chk->snd_count++;       /* update our count */
9502                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9503                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9504                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9505                     no_fragmentflg, 0, 0,
9506                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9507                     chk->whoTo->port, NULL,
9508                     0, 0,
9509                     so_locked))) {
9510                         SCTP_STAT_INCR(sctps_lowlevelerr);
9511                         return (error);
9512                 }
9513                 endofchain = NULL;
9514                 auth = NULL;
9515                 auth_offset = 0;
9516                 /*
9517                  * We don't want to mark the net->sent time here since this
9518                  * we use this for HB and retrans cannot measure RTT
9519                  */
9520                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9521                 *cnt_out += 1;
9522                 chk->sent = SCTP_DATAGRAM_SENT;
9523                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9524                 if (fwd_tsn == 0) {
9525                         return (0);
9526                 } else {
9527                         /* Clean up the fwd-tsn list */
9528                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9529                         return (0);
9530                 }
9531         }
9532         /*
9533          * Ok, it is just data retransmission we need to do or that and a
9534          * fwd-tsn with it all.
9535          */
9536         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9537                 return (SCTP_RETRAN_DONE);
9538         }
9539         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9540             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9541                 /* not yet open, resend the cookie and that is it */
9542                 return (1);
9543         }
9544 #ifdef SCTP_AUDITING_ENABLED
9545         sctp_auditing(20, inp, stcb, NULL);
9546 #endif
9547         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9548         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9549                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9550                         /* No, not sent to this net or not ready for rtx */
9551                         continue;
9552                 }
9553                 if (chk->data == NULL) {
9554                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9555                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9556                         continue;
9557                 }
9558                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9559                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9560                         /* Gak, we have exceeded max unlucky retran, abort! */
9561                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9562                             chk->snd_count,
9563                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9564                         atomic_add_int(&stcb->asoc.refcnt, 1);
9565                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9566                         SCTP_TCB_LOCK(stcb);
9567                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9568                         return (SCTP_RETRAN_EXIT);
9569                 }
9570                 /* pick up the net */
9571                 net = chk->whoTo;
9572                 switch (net->ro._l_addr.sa.sa_family) {
9573 #ifdef INET
9574                 case AF_INET:
9575                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9576                         break;
9577 #endif
9578 #ifdef INET6
9579                 case AF_INET6:
9580                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9581                         break;
9582 #endif
9583                 default:
9584                         /* TSNH */
9585                         mtu = net->mtu;
9586                         break;
9587                 }
9588
9589                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9590                         /* No room in peers rwnd */
9591                         uint32_t tsn;
9592
9593                         tsn = asoc->last_acked_seq + 1;
9594                         if (tsn == chk->rec.data.TSN_seq) {
9595                                 /*
9596                                  * we make a special exception for this
9597                                  * case. The peer has no rwnd but is missing
9598                                  * the lowest chunk.. which is probably what
9599                                  * is holding up the rwnd.
9600                                  */
9601                                 goto one_chunk_around;
9602                         }
9603                         return (1);
9604                 }
9605 one_chunk_around:
9606                 if (asoc->peers_rwnd < mtu) {
9607                         one_chunk = 1;
9608                         if ((asoc->peers_rwnd == 0) &&
9609                             (asoc->total_flight == 0)) {
9610                                 chk->window_probe = 1;
9611                                 chk->whoTo->window_probe = 1;
9612                         }
9613                 }
9614 #ifdef SCTP_AUDITING_ENABLED
9615                 sctp_audit_log(0xC3, 2);
9616 #endif
9617                 bundle_at = 0;
9618                 m = NULL;
9619                 net->fast_retran_ip = 0;
9620                 if (chk->rec.data.doing_fast_retransmit == 0) {
9621                         /*
9622                          * if no FR in progress skip destination that have
9623                          * flight_size > cwnd.
9624                          */
9625                         if (net->flight_size >= net->cwnd) {
9626                                 continue;
9627                         }
9628                 } else {
9629                         /*
9630                          * Mark the destination net to have FR recovery
9631                          * limits put on it.
9632                          */
9633                         *fr_done = 1;
9634                         net->fast_retran_ip = 1;
9635                 }
9636
9637                 /*
9638                  * if no AUTH is yet included and this chunk requires it,
9639                  * make sure to account for it.  We don't apply the size
9640                  * until the AUTH chunk is actually added below in case
9641                  * there is no room for this chunk.
9642                  */
9643                 if (data_auth_reqd && (auth == NULL)) {
9644                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9645                 } else
9646                         dmtu = 0;
9647
9648                 if ((chk->send_size <= (mtu - dmtu)) ||
9649                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9650                         /* ok we will add this one */
9651                         if (data_auth_reqd) {
9652                                 if (auth == NULL) {
9653                                         m = sctp_add_auth_chunk(m,
9654                                             &endofchain,
9655                                             &auth,
9656                                             &auth_offset,
9657                                             stcb,
9658                                             SCTP_DATA);
9659                                         auth_keyid = chk->auth_keyid;
9660                                         override_ok = 0;
9661                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9662                                 } else if (override_ok) {
9663                                         auth_keyid = chk->auth_keyid;
9664                                         override_ok = 0;
9665                                 } else if (chk->auth_keyid != auth_keyid) {
9666                                         /* different keyid, so done bundling */
9667                                         break;
9668                                 }
9669                         }
9670                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9671                         if (m == NULL) {
9672                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9673                                 return (ENOMEM);
9674                         }
9675                         /* Do clear IP_DF ? */
9676                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9677                                 no_fragmentflg = 0;
9678                         }
9679                         /* upate our MTU size */
9680                         if (mtu > (chk->send_size + dmtu))
9681                                 mtu -= (chk->send_size + dmtu);
9682                         else
9683                                 mtu = 0;
9684                         data_list[bundle_at++] = chk;
9685                         if (one_chunk && (asoc->total_flight <= 0)) {
9686                                 SCTP_STAT_INCR(sctps_windowprobed);
9687                         }
9688                 }
9689                 if (one_chunk == 0) {
9690                         /*
9691                          * now are there anymore forward from chk to pick
9692                          * up?
9693                          */
9694                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9695                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9696                                         /* Nope, not for retran */
9697                                         continue;
9698                                 }
9699                                 if (fwd->whoTo != net) {
9700                                         /* Nope, not the net in question */
9701                                         continue;
9702                                 }
9703                                 if (data_auth_reqd && (auth == NULL)) {
9704                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9705                                 } else
9706                                         dmtu = 0;
9707                                 if (fwd->send_size <= (mtu - dmtu)) {
9708                                         if (data_auth_reqd) {
9709                                                 if (auth == NULL) {
9710                                                         m = sctp_add_auth_chunk(m,
9711                                                             &endofchain,
9712                                                             &auth,
9713                                                             &auth_offset,
9714                                                             stcb,
9715                                                             SCTP_DATA);
9716                                                         auth_keyid = fwd->auth_keyid;
9717                                                         override_ok = 0;
9718                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9719                                                 } else if (override_ok) {
9720                                                         auth_keyid = fwd->auth_keyid;
9721                                                         override_ok = 0;
9722                                                 } else if (fwd->auth_keyid != auth_keyid) {
9723                                                         /*
9724                                                          * different keyid,
9725                                                          * so done bundling
9726                                                          */
9727                                                         break;
9728                                                 }
9729                                         }
9730                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9731                                         if (m == NULL) {
9732                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9733                                                 return (ENOMEM);
9734                                         }
9735                                         /* Do clear IP_DF ? */
9736                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9737                                                 no_fragmentflg = 0;
9738                                         }
9739                                         /* upate our MTU size */
9740                                         if (mtu > (fwd->send_size + dmtu))
9741                                                 mtu -= (fwd->send_size + dmtu);
9742                                         else
9743                                                 mtu = 0;
9744                                         data_list[bundle_at++] = fwd;
9745                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9746                                                 break;
9747                                         }
9748                                 } else {
9749                                         /* can't fit so we are done */
9750                                         break;
9751                                 }
9752                         }
9753                 }
9754                 /* Is there something to send for this destination? */
9755                 if (m) {
9756                         /*
9757                          * No matter if we fail/or suceed we should start a
9758                          * timer. A failure is like a lost IP packet :-)
9759                          */
9760                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9761                                 /*
9762                                  * no timer running on this destination
9763                                  * restart it.
9764                                  */
9765                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9766                                 tmr_started = 1;
9767                         }
9768                         /* Now lets send it, if there is anything to send :> */
9769                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9770                             (struct sockaddr *)&net->ro._l_addr, m,
9771                             auth_offset, auth, auth_keyid,
9772                             no_fragmentflg, 0, 0,
9773                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9774                             net->port, NULL,
9775                             0, 0,
9776                             so_locked))) {
9777                                 /* error, we could not output */
9778                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9779                                 return (error);
9780                         }
9781                         endofchain = NULL;
9782                         auth = NULL;
9783                         auth_offset = 0;
9784                         /* For HB's */
9785                         /*
9786                          * We don't want to mark the net->sent time here
9787                          * since this we use this for HB and retrans cannot
9788                          * measure RTT
9789                          */
9790                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9791
9792                         /* For auto-close */
9793                         cnt_thru++;
9794                         if (*now_filled == 0) {
9795                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9796                                 *now = asoc->time_last_sent;
9797                                 *now_filled = 1;
9798                         } else {
9799                                 asoc->time_last_sent = *now;
9800                         }
9801                         *cnt_out += bundle_at;
9802 #ifdef SCTP_AUDITING_ENABLED
9803                         sctp_audit_log(0xC4, bundle_at);
9804 #endif
9805                         if (bundle_at) {
9806                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9807                         }
9808                         for (i = 0; i < bundle_at; i++) {
9809                                 SCTP_STAT_INCR(sctps_sendretransdata);
9810                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9811                                 /*
9812                                  * When we have a revoked data, and we
9813                                  * retransmit it, then we clear the revoked
9814                                  * flag since this flag dictates if we
9815                                  * subtracted from the fs
9816                                  */
9817                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9818                                         /* Deflate the cwnd */
9819                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9820                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9821                                 }
9822                                 data_list[i]->snd_count++;
9823                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9824                                 /* record the time */
9825                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9826                                 if (data_list[i]->book_size_scale) {
9827                                         /*
9828                                          * need to double the book size on
9829                                          * this one
9830                                          */
9831                                         data_list[i]->book_size_scale = 0;
9832                                         /*
9833                                          * Since we double the booksize, we
9834                                          * must also double the output queue
9835                                          * size, since this get shrunk when
9836                                          * we free by this amount.
9837                                          */
9838                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9839                                         data_list[i]->book_size *= 2;
9840
9841
9842                                 } else {
9843                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9844                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9845                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9846                                         }
9847                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9848                                             (uint32_t) (data_list[i]->send_size +
9849                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9850                                 }
9851                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9852                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9853                                             data_list[i]->whoTo->flight_size,
9854                                             data_list[i]->book_size,
9855                                             (uintptr_t) data_list[i]->whoTo,
9856                                             data_list[i]->rec.data.TSN_seq);
9857                                 }
9858                                 sctp_flight_size_increase(data_list[i]);
9859                                 sctp_total_flight_increase(stcb, data_list[i]);
9860                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9861                                         /* SWS sender side engages */
9862                                         asoc->peers_rwnd = 0;
9863                                 }
9864                                 if ((i == 0) &&
9865                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9866                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9867                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9868                                             (tmr_started == 0)) {
9869                                                 /*-
9870                                                  * ok we just fast-retrans'd
9871                                                  * the lowest TSN, i.e the
9872                                                  * first on the list. In
9873                                                  * this case we want to give
9874                                                  * some more time to get a
9875                                                  * SACK back without a
9876                                                  * t3-expiring.
9877                                                  */
9878                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9879                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9880                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9881                                         }
9882                                 }
9883                         }
9884                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9885                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9886                         }
9887 #ifdef SCTP_AUDITING_ENABLED
9888                         sctp_auditing(21, inp, stcb, NULL);
9889 #endif
9890                 } else {
9891                         /* None will fit */
9892                         return (1);
9893                 }
9894                 if (asoc->sent_queue_retran_cnt <= 0) {
9895                         /* all done we have no more to retran */
9896                         asoc->sent_queue_retran_cnt = 0;
9897                         break;
9898                 }
9899                 if (one_chunk) {
9900                         /* No more room in rwnd */
9901                         return (1);
9902                 }
9903                 /* stop the for loop here. we sent out a packet */
9904                 break;
9905         }
9906         return (0);
9907 }
9908
9909 static void
9910 sctp_timer_validation(struct sctp_inpcb *inp,
9911     struct sctp_tcb *stcb,
9912     struct sctp_association *asoc)
9913 {
9914         struct sctp_nets *net;
9915
9916         /* Validate that a timer is running somewhere */
9917         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9918                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9919                         /* Here is a timer */
9920                         return;
9921                 }
9922         }
9923         SCTP_TCB_LOCK_ASSERT(stcb);
9924         /* Gak, we did not have a timer somewhere */
9925         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9926         if (asoc->alternate) {
9927                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9928         } else {
9929                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9930         }
9931         return;
9932 }
9933
9934 void
9935 sctp_chunk_output(struct sctp_inpcb *inp,
9936     struct sctp_tcb *stcb,
9937     int from_where,
9938     int so_locked
9939 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9940     SCTP_UNUSED
9941 #endif
9942 )
9943 {
9944         /*-
9945          * Ok this is the generic chunk service queue. we must do the
9946          * following:
9947          * - See if there are retransmits pending, if so we must
9948          *   do these first.
9949          * - Service the stream queue that is next, moving any
9950          *   message (note I must get a complete message i.e.
9951          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9952          *   TSN's
9953          * - Check to see if the cwnd/rwnd allows any output, if so we
9954          *   go ahead and fomulate and send the low level chunks. Making sure
9955          *   to combine any control in the control chunk queue also.
9956          */
9957         struct sctp_association *asoc;
9958         struct sctp_nets *net;
9959         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9960         unsigned int burst_cnt = 0;
9961         struct timeval now;
9962         int now_filled = 0;
9963         int nagle_on;
9964         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9965         int un_sent = 0;
9966         int fr_done;
9967         unsigned int tot_frs = 0;
9968
9969         asoc = &stcb->asoc;
9970         /* The Nagle algorithm is only applied when handling a send call. */
9971         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9972                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9973                         nagle_on = 0;
9974                 } else {
9975                         nagle_on = 1;
9976                 }
9977         } else {
9978                 nagle_on = 0;
9979         }
9980         SCTP_TCB_LOCK_ASSERT(stcb);
9981
9982         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9983
9984         if ((un_sent <= 0) &&
9985             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9986             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9987             (asoc->sent_queue_retran_cnt == 0)) {
9988                 /* Nothing to do unless there is something to be sent left */
9989                 return;
9990         }
9991         /*
9992          * Do we have something to send, data or control AND a sack timer
9993          * running, if so piggy-back the sack.
9994          */
9995         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9996                 sctp_send_sack(stcb, so_locked);
9997                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9998         }
9999         while (asoc->sent_queue_retran_cnt) {
10000                 /*-
10001                  * Ok, it is retransmission time only, we send out only ONE
10002                  * packet with a single call off to the retran code.
10003                  */
10004                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10005                         /*-
10006                          * Special hook for handling cookiess discarded
10007                          * by peer that carried data. Send cookie-ack only
10008                          * and then the next call with get the retran's.
10009                          */
10010                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10011                             from_where,
10012                             &now, &now_filled, frag_point, so_locked);
10013                         return;
10014                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10015                         /* if its not from a HB then do it */
10016                         fr_done = 0;
10017                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10018                         if (fr_done) {
10019                                 tot_frs++;
10020                         }
10021                 } else {
10022                         /*
10023                          * its from any other place, we don't allow retran
10024                          * output (only control)
10025                          */
10026                         ret = 1;
10027                 }
10028                 if (ret > 0) {
10029                         /* Can't send anymore */
10030                         /*-
10031                          * now lets push out control by calling med-level
10032                          * output once. this assures that we WILL send HB's
10033                          * if queued too.
10034                          */
10035                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10036                             from_where,
10037                             &now, &now_filled, frag_point, so_locked);
10038 #ifdef SCTP_AUDITING_ENABLED
10039                         sctp_auditing(8, inp, stcb, NULL);
10040 #endif
10041                         sctp_timer_validation(inp, stcb, asoc);
10042                         return;
10043                 }
10044                 if (ret < 0) {
10045                         /*-
10046                          * The count was off.. retran is not happening so do
10047                          * the normal retransmission.
10048                          */
10049 #ifdef SCTP_AUDITING_ENABLED
10050                         sctp_auditing(9, inp, stcb, NULL);
10051 #endif
10052                         if (ret == SCTP_RETRAN_EXIT) {
10053                                 return;
10054                         }
10055                         break;
10056                 }
10057                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10058                         /* Only one transmission allowed out of a timeout */
10059 #ifdef SCTP_AUDITING_ENABLED
10060                         sctp_auditing(10, inp, stcb, NULL);
10061 #endif
10062                         /* Push out any control */
10063                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10064                             &now, &now_filled, frag_point, so_locked);
10065                         return;
10066                 }
10067                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10068                         /* Hit FR burst limit */
10069                         return;
10070                 }
10071                 if ((num_out == 0) && (ret == 0)) {
10072                         /* No more retrans to send */
10073                         break;
10074                 }
10075         }
10076 #ifdef SCTP_AUDITING_ENABLED
10077         sctp_auditing(12, inp, stcb, NULL);
10078 #endif
10079         /* Check for bad destinations, if they exist move chunks around. */
10080         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10081                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10082                         /*-
10083                          * if possible move things off of this address we
10084                          * still may send below due to the dormant state but
10085                          * we try to find an alternate address to send to
10086                          * and if we have one we move all queued data on the
10087                          * out wheel to this alternate address.
10088                          */
10089                         if (net->ref_count > 1)
10090                                 sctp_move_chunks_from_net(stcb, net);
10091                 } else {
10092                         /*-
10093                          * if ((asoc->sat_network) || (net->addr_is_local))
10094                          * { burst_limit = asoc->max_burst *
10095                          * SCTP_SAT_NETWORK_BURST_INCR; }
10096                          */
10097                         if (asoc->max_burst > 0) {
10098                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10099                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10100                                                 /*
10101                                                  * JRS - Use the congestion
10102                                                  * control given in the
10103                                                  * congestion control module
10104                                                  */
10105                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10106                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10107                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10108                                                 }
10109                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10110                                         }
10111                                         net->fast_retran_ip = 0;
10112                                 } else {
10113                                         if (net->flight_size == 0) {
10114                                                 /*
10115                                                  * Should be decaying the
10116                                                  * cwnd here
10117                                                  */
10118                                                 ;
10119                                         }
10120                                 }
10121                         }
10122                 }
10123
10124         }
10125         burst_cnt = 0;
10126         do {
10127                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10128                     &reason_code, 0, from_where,
10129                     &now, &now_filled, frag_point, so_locked);
10130                 if (error) {
10131                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10132                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10133                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10134                         }
10135                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10136                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10137                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10138                         }
10139                         break;
10140                 }
10141                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10142
10143                 tot_out += num_out;
10144                 burst_cnt++;
10145                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10146                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10147                         if (num_out == 0) {
10148                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10149                         }
10150                 }
10151                 if (nagle_on) {
10152                         /*
10153                          * When the Nagle algorithm is used, look at how
10154                          * much is unsent, then if its smaller than an MTU
10155                          * and we have data in flight we stop, except if we
10156                          * are handling a fragmented user message.
10157                          */
10158                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10159                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10160                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10161                             (stcb->asoc.total_flight > 0) &&
10162                             ((stcb->asoc.locked_on_sending == NULL) ||
10163                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10164                                 break;
10165                         }
10166                 }
10167                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10168                     TAILQ_EMPTY(&asoc->send_queue) &&
10169                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10170                         /* Nothing left to send */
10171                         break;
10172                 }
10173                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10174                         /* Nothing left to send */
10175                         break;
10176                 }
10177         } while (num_out &&
10178             ((asoc->max_burst == 0) ||
10179             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10180             (burst_cnt < asoc->max_burst)));
10181
10182         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10183                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10184                         SCTP_STAT_INCR(sctps_maxburstqueued);
10185                         asoc->burst_limit_applied = 1;
10186                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10187                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10188                         }
10189                 } else {
10190                         asoc->burst_limit_applied = 0;
10191                 }
10192         }
10193         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10194                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10195         }
10196         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10197             tot_out);
10198
10199         /*-
10200          * Now we need to clean up the control chunk chain if a ECNE is on
10201          * it. It must be marked as UNSENT again so next call will continue
10202          * to send it until such time that we get a CWR, to remove it.
10203          */
10204         if (stcb->asoc.ecn_echo_cnt_onq)
10205                 sctp_fix_ecn_echo(asoc);
10206         return;
10207 }
10208
10209
10210 int
10211 sctp_output(
10212     struct sctp_inpcb *inp,
10213     struct mbuf *m,
10214     struct sockaddr *addr,
10215     struct mbuf *control,
10216     struct thread *p,
10217     int flags)
10218 {
10219         if (inp == NULL) {
10220                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10221                 return (EINVAL);
10222         }
10223         if (inp->sctp_socket == NULL) {
10224                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10225                 return (EINVAL);
10226         }
10227         return (sctp_sosend(inp->sctp_socket,
10228             addr,
10229             (struct uio *)NULL,
10230             m,
10231             control,
10232             flags, p
10233             ));
10234 }
10235
10236 void
10237 send_forward_tsn(struct sctp_tcb *stcb,
10238     struct sctp_association *asoc)
10239 {
10240         struct sctp_tmit_chunk *chk;
10241         struct sctp_forward_tsn_chunk *fwdtsn;
10242         uint32_t advance_peer_ack_point;
10243
10244         SCTP_TCB_LOCK_ASSERT(stcb);
10245         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10246                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10247                         /* mark it to unsent */
10248                         chk->sent = SCTP_DATAGRAM_UNSENT;
10249                         chk->snd_count = 0;
10250                         /* Do we correct its output location? */
10251                         if (chk->whoTo) {
10252                                 sctp_free_remote_addr(chk->whoTo);
10253                                 chk->whoTo = NULL;
10254                         }
10255                         goto sctp_fill_in_rest;
10256                 }
10257         }
10258         /* Ok if we reach here we must build one */
10259         sctp_alloc_a_chunk(stcb, chk);
10260         if (chk == NULL) {
10261                 return;
10262         }
10263         asoc->fwd_tsn_cnt++;
10264         chk->copy_by_ref = 0;
10265         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10266         chk->rec.chunk_id.can_take_data = 0;
10267         chk->asoc = asoc;
10268         chk->whoTo = NULL;
10269         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10270         if (chk->data == NULL) {
10271                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10272                 return;
10273         }
10274         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10275         chk->sent = SCTP_DATAGRAM_UNSENT;
10276         chk->snd_count = 0;
10277         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10278         asoc->ctrl_queue_cnt++;
10279 sctp_fill_in_rest:
10280         /*-
10281          * Here we go through and fill out the part that deals with
10282          * stream/seq of the ones we skip.
10283          */
10284         SCTP_BUF_LEN(chk->data) = 0;
10285         {
10286                 struct sctp_tmit_chunk *at, *tp1, *last;
10287                 struct sctp_strseq *strseq;
10288                 unsigned int cnt_of_space, i, ovh;
10289                 unsigned int space_needed;
10290                 unsigned int cnt_of_skipped = 0;
10291
10292                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10293                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10294                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10295                                 /* no more to look at */
10296                                 break;
10297                         }
10298                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10299                                 /* We don't report these */
10300                                 continue;
10301                         }
10302                         cnt_of_skipped++;
10303                 }
10304                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10305                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10306
10307                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10308
10309                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10310                         ovh = SCTP_MIN_OVERHEAD;
10311                 } else {
10312                         ovh = SCTP_MIN_V4_OVERHEAD;
10313                 }
10314                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10315                         /* trim to a mtu size */
10316                         cnt_of_space = asoc->smallest_mtu - ovh;
10317                 }
10318                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10319                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10320                             0xff, 0, cnt_of_skipped,
10321                             asoc->advanced_peer_ack_point);
10322
10323                 }
10324                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10325                 if (cnt_of_space < space_needed) {
10326                         /*-
10327                          * ok we must trim down the chunk by lowering the
10328                          * advance peer ack point.
10329                          */
10330                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10331                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10332                                     0xff, 0xff, cnt_of_space,
10333                                     space_needed);
10334                         }
10335                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10336                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10337                         /*-
10338                          * Go through and find the TSN that will be the one
10339                          * we report.
10340                          */
10341                         at = TAILQ_FIRST(&asoc->sent_queue);
10342                         if (at != NULL) {
10343                                 for (i = 0; i < cnt_of_skipped; i++) {
10344                                         tp1 = TAILQ_NEXT(at, sctp_next);
10345                                         if (tp1 == NULL) {
10346                                                 break;
10347                                         }
10348                                         at = tp1;
10349                                 }
10350                         }
10351                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10352                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10353                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10354                                     asoc->advanced_peer_ack_point);
10355                         }
10356                         last = at;
10357                         /*-
10358                          * last now points to last one I can report, update
10359                          * peer ack point
10360                          */
10361                         if (last)
10362                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10363                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10364                             cnt_of_skipped * sizeof(struct sctp_strseq);
10365                 }
10366                 chk->send_size = space_needed;
10367                 /* Setup the chunk */
10368                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10369                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10370                 fwdtsn->ch.chunk_flags = 0;
10371                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10372                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10373                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10374                 fwdtsn++;
10375                 /*-
10376                  * Move pointer to after the fwdtsn and transfer to the
10377                  * strseq pointer.
10378                  */
10379                 strseq = (struct sctp_strseq *)fwdtsn;
10380                 /*-
10381                  * Now populate the strseq list. This is done blindly
10382                  * without pulling out duplicate stream info. This is
10383                  * inefficent but won't harm the process since the peer will
10384                  * look at these in sequence and will thus release anything.
10385                  * It could mean we exceed the PMTU and chop off some that
10386                  * we could have included.. but this is unlikely (aka 1432/4
10387                  * would mean 300+ stream seq's would have to be reported in
10388                  * one FWD-TSN. With a bit of work we can later FIX this to
10389                  * optimize and pull out duplcates.. but it does add more
10390                  * overhead. So for now... not!
10391                  */
10392                 at = TAILQ_FIRST(&asoc->sent_queue);
10393                 for (i = 0; i < cnt_of_skipped; i++) {
10394                         tp1 = TAILQ_NEXT(at, sctp_next);
10395                         if (tp1 == NULL)
10396                                 break;
10397                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10398                                 /* We don't report these */
10399                                 i--;
10400                                 at = tp1;
10401                                 continue;
10402                         }
10403                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10404                                 at->rec.data.fwd_tsn_cnt = 0;
10405                         }
10406                         strseq->stream = ntohs(at->rec.data.stream_number);
10407                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10408                         strseq++;
10409                         at = tp1;
10410                 }
10411         }
10412         return;
10413 }
10414
10415 void
10416 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10417 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10418     SCTP_UNUSED
10419 #endif
10420 )
10421 {
10422         /*-
10423          * Queue up a SACK or NR-SACK in the control queue.
10424          * We must first check to see if a SACK or NR-SACK is
10425          * somehow on the control queue.
10426          * If so, we will take and and remove the old one.
10427          */
10428         struct sctp_association *asoc;
10429         struct sctp_tmit_chunk *chk, *a_chk;
10430         struct sctp_sack_chunk *sack;
10431         struct sctp_nr_sack_chunk *nr_sack;
10432         struct sctp_gap_ack_block *gap_descriptor;
10433         struct sack_track *selector;
10434         int mergeable = 0;
10435         int offset;
10436         caddr_t limit;
10437         uint32_t *dup;
10438         int limit_reached = 0;
10439         unsigned int i, siz, j;
10440         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10441         int num_dups = 0;
10442         int space_req;
10443         uint32_t highest_tsn;
10444         uint8_t flags;
10445         uint8_t type;
10446         uint8_t tsn_map;
10447
10448         if (stcb->asoc.nrsack_supported == 1) {
10449                 type = SCTP_NR_SELECTIVE_ACK;
10450         } else {
10451                 type = SCTP_SELECTIVE_ACK;
10452         }
10453         a_chk = NULL;
10454         asoc = &stcb->asoc;
10455         SCTP_TCB_LOCK_ASSERT(stcb);
10456         if (asoc->last_data_chunk_from == NULL) {
10457                 /* Hmm we never received anything */
10458                 return;
10459         }
10460         sctp_slide_mapping_arrays(stcb);
10461         sctp_set_rwnd(stcb, asoc);
10462         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10463                 if (chk->rec.chunk_id.id == type) {
10464                         /* Hmm, found a sack already on queue, remove it */
10465                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10466                         asoc->ctrl_queue_cnt--;
10467                         a_chk = chk;
10468                         if (a_chk->data) {
10469                                 sctp_m_freem(a_chk->data);
10470                                 a_chk->data = NULL;
10471                         }
10472                         if (a_chk->whoTo) {
10473                                 sctp_free_remote_addr(a_chk->whoTo);
10474                                 a_chk->whoTo = NULL;
10475                         }
10476                         break;
10477                 }
10478         }
10479         if (a_chk == NULL) {
10480                 sctp_alloc_a_chunk(stcb, a_chk);
10481                 if (a_chk == NULL) {
10482                         /* No memory so we drop the idea, and set a timer */
10483                         if (stcb->asoc.delayed_ack) {
10484                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10485                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10486                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10487                                     stcb->sctp_ep, stcb, NULL);
10488                         } else {
10489                                 stcb->asoc.send_sack = 1;
10490                         }
10491                         return;
10492                 }
10493                 a_chk->copy_by_ref = 0;
10494                 a_chk->rec.chunk_id.id = type;
10495                 a_chk->rec.chunk_id.can_take_data = 1;
10496         }
10497         /* Clear our pkt counts */
10498         asoc->data_pkts_seen = 0;
10499
10500         a_chk->asoc = asoc;
10501         a_chk->snd_count = 0;
10502         a_chk->send_size = 0;   /* fill in later */
10503         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10504         a_chk->whoTo = NULL;
10505
10506         if ((asoc->numduptsns) ||
10507             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10508                 /*-
10509                  * Ok, we have some duplicates or the destination for the
10510                  * sack is unreachable, lets see if we can select an
10511                  * alternate than asoc->last_data_chunk_from
10512                  */
10513                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10514                     (asoc->used_alt_onsack > asoc->numnets)) {
10515                         /* We used an alt last time, don't this time */
10516                         a_chk->whoTo = NULL;
10517                 } else {
10518                         asoc->used_alt_onsack++;
10519                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10520                 }
10521                 if (a_chk->whoTo == NULL) {
10522                         /* Nope, no alternate */
10523                         a_chk->whoTo = asoc->last_data_chunk_from;
10524                         asoc->used_alt_onsack = 0;
10525                 }
10526         } else {
10527                 /*
10528                  * No duplicates so we use the last place we received data
10529                  * from.
10530                  */
10531                 asoc->used_alt_onsack = 0;
10532                 a_chk->whoTo = asoc->last_data_chunk_from;
10533         }
10534         if (a_chk->whoTo) {
10535                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10536         }
10537         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10538                 highest_tsn = asoc->highest_tsn_inside_map;
10539         } else {
10540                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10541         }
10542         if (highest_tsn == asoc->cumulative_tsn) {
10543                 /* no gaps */
10544                 if (type == SCTP_SELECTIVE_ACK) {
10545                         space_req = sizeof(struct sctp_sack_chunk);
10546                 } else {
10547                         space_req = sizeof(struct sctp_nr_sack_chunk);
10548                 }
10549         } else {
10550                 /* gaps get a cluster */
10551                 space_req = MCLBYTES;
10552         }
10553         /* Ok now lets formulate a MBUF with our sack */
10554         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10555         if ((a_chk->data == NULL) ||
10556             (a_chk->whoTo == NULL)) {
10557                 /* rats, no mbuf memory */
10558                 if (a_chk->data) {
10559                         /* was a problem with the destination */
10560                         sctp_m_freem(a_chk->data);
10561                         a_chk->data = NULL;
10562                 }
10563                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10564                 /* sa_ignore NO_NULL_CHK */
10565                 if (stcb->asoc.delayed_ack) {
10566                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10567                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10568                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10569                             stcb->sctp_ep, stcb, NULL);
10570                 } else {
10571                         stcb->asoc.send_sack = 1;
10572                 }
10573                 return;
10574         }
10575         /* ok, lets go through and fill it in */
10576         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10577         space = M_TRAILINGSPACE(a_chk->data);
10578         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10579                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10580         }
10581         limit = mtod(a_chk->data, caddr_t);
10582         limit += space;
10583
10584         flags = 0;
10585
10586         if ((asoc->sctp_cmt_on_off > 0) &&
10587             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10588                 /*-
10589                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10590                  * received, then set high bit to 1, else 0. Reset
10591                  * pkts_rcvd.
10592                  */
10593                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10594                 asoc->cmt_dac_pkts_rcvd = 0;
10595         }
10596 #ifdef SCTP_ASOCLOG_OF_TSNS
10597         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10598         stcb->asoc.cumack_log_atsnt++;
10599         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10600                 stcb->asoc.cumack_log_atsnt = 0;
10601         }
10602 #endif
10603         /* reset the readers interpretation */
10604         stcb->freed_by_sorcv_sincelast = 0;
10605
10606         if (type == SCTP_SELECTIVE_ACK) {
10607                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10608                 nr_sack = NULL;
10609                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10610                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10611                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10612                 } else {
10613                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10614                 }
10615         } else {
10616                 sack = NULL;
10617                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10618                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10619                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10620                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10621                 } else {
10622                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10623                 }
10624         }
10625
10626         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10627                 offset = 1;
10628         } else {
10629                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10630         }
10631         if (((type == SCTP_SELECTIVE_ACK) &&
10632             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10633             ((type == SCTP_NR_SELECTIVE_ACK) &&
10634             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10635                 /* we have a gap .. maybe */
10636                 for (i = 0; i < siz; i++) {
10637                         tsn_map = asoc->mapping_array[i];
10638                         if (type == SCTP_SELECTIVE_ACK) {
10639                                 tsn_map |= asoc->nr_mapping_array[i];
10640                         }
10641                         if (i == 0) {
10642                                 /*
10643                                  * Clear all bits corresponding to TSNs
10644                                  * smaller or equal to the cumulative TSN.
10645                                  */
10646                                 tsn_map &= (~0 << (1 - offset));
10647                         }
10648                         selector = &sack_array[tsn_map];
10649                         if (mergeable && selector->right_edge) {
10650                                 /*
10651                                  * Backup, left and right edges were ok to
10652                                  * merge.
10653                                  */
10654                                 num_gap_blocks--;
10655                                 gap_descriptor--;
10656                         }
10657                         if (selector->num_entries == 0)
10658                                 mergeable = 0;
10659                         else {
10660                                 for (j = 0; j < selector->num_entries; j++) {
10661                                         if (mergeable && selector->right_edge) {
10662                                                 /*
10663                                                  * do a merge by NOT setting
10664                                                  * the left side
10665                                                  */
10666                                                 mergeable = 0;
10667                                         } else {
10668                                                 /*
10669                                                  * no merge, set the left
10670                                                  * side
10671                                                  */
10672                                                 mergeable = 0;
10673                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10674                                         }
10675                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10676                                         num_gap_blocks++;
10677                                         gap_descriptor++;
10678                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10679                                                 /* no more room */
10680                                                 limit_reached = 1;
10681                                                 break;
10682                                         }
10683                                 }
10684                                 if (selector->left_edge) {
10685                                         mergeable = 1;
10686                                 }
10687                         }
10688                         if (limit_reached) {
10689                                 /* Reached the limit stop */
10690                                 break;
10691                         }
10692                         offset += 8;
10693                 }
10694         }
10695         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10696             (limit_reached == 0)) {
10697
10698                 mergeable = 0;
10699
10700                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10701                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10702                 } else {
10703                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10704                 }
10705
10706                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10707                         offset = 1;
10708                 } else {
10709                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10710                 }
10711                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10712                         /* we have a gap .. maybe */
10713                         for (i = 0; i < siz; i++) {
10714                                 tsn_map = asoc->nr_mapping_array[i];
10715                                 if (i == 0) {
10716                                         /*
10717                                          * Clear all bits corresponding to
10718                                          * TSNs smaller or equal to the
10719                                          * cumulative TSN.
10720                                          */
10721                                         tsn_map &= (~0 << (1 - offset));
10722                                 }
10723                                 selector = &sack_array[tsn_map];
10724                                 if (mergeable && selector->right_edge) {
10725                                         /*
10726                                          * Backup, left and right edges were
10727                                          * ok to merge.
10728                                          */
10729                                         num_nr_gap_blocks--;
10730                                         gap_descriptor--;
10731                                 }
10732                                 if (selector->num_entries == 0)
10733                                         mergeable = 0;
10734                                 else {
10735                                         for (j = 0; j < selector->num_entries; j++) {
10736                                                 if (mergeable && selector->right_edge) {
10737                                                         /*
10738                                                          * do a merge by NOT
10739                                                          * setting the left
10740                                                          * side
10741                                                          */
10742                                                         mergeable = 0;
10743                                                 } else {
10744                                                         /*
10745                                                          * no merge, set the
10746                                                          * left side
10747                                                          */
10748                                                         mergeable = 0;
10749                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10750                                                 }
10751                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10752                                                 num_nr_gap_blocks++;
10753                                                 gap_descriptor++;
10754                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10755                                                         /* no more room */
10756                                                         limit_reached = 1;
10757                                                         break;
10758                                                 }
10759                                         }
10760                                         if (selector->left_edge) {
10761                                                 mergeable = 1;
10762                                         }
10763                                 }
10764                                 if (limit_reached) {
10765                                         /* Reached the limit stop */
10766                                         break;
10767                                 }
10768                                 offset += 8;
10769                         }
10770                 }
10771         }
10772         /* now we must add any dups we are going to report. */
10773         if ((limit_reached == 0) && (asoc->numduptsns)) {
10774                 dup = (uint32_t *) gap_descriptor;
10775                 for (i = 0; i < asoc->numduptsns; i++) {
10776                         *dup = htonl(asoc->dup_tsns[i]);
10777                         dup++;
10778                         num_dups++;
10779                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10780                                 /* no more room */
10781                                 break;
10782                         }
10783                 }
10784                 asoc->numduptsns = 0;
10785         }
10786         /*
10787          * now that the chunk is prepared queue it to the control chunk
10788          * queue.
10789          */
10790         if (type == SCTP_SELECTIVE_ACK) {
10791                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10792                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10793                     num_dups * sizeof(int32_t);
10794                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10795                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10796                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10797                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10798                 sack->sack.num_dup_tsns = htons(num_dups);
10799                 sack->ch.chunk_type = type;
10800                 sack->ch.chunk_flags = flags;
10801                 sack->ch.chunk_length = htons(a_chk->send_size);
10802         } else {
10803                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10804                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10805                     num_dups * sizeof(int32_t);
10806                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10807                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10808                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10809                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10810                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10811                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10812                 nr_sack->nr_sack.reserved = 0;
10813                 nr_sack->ch.chunk_type = type;
10814                 nr_sack->ch.chunk_flags = flags;
10815                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10816         }
10817         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10818         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10819         asoc->ctrl_queue_cnt++;
10820         asoc->send_sack = 0;
10821         SCTP_STAT_INCR(sctps_sendsacks);
10822         return;
10823 }
10824
10825 void
10826 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10827 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10828     SCTP_UNUSED
10829 #endif
10830 )
10831 {
10832         struct mbuf *m_abort, *m, *m_last;
10833         struct mbuf *m_out, *m_end = NULL;
10834         struct sctp_abort_chunk *abort;
10835         struct sctp_auth_chunk *auth = NULL;
10836         struct sctp_nets *net;
10837         uint32_t vtag;
10838         uint32_t auth_offset = 0;
10839         uint16_t cause_len, chunk_len, padding_len;
10840
10841         SCTP_TCB_LOCK_ASSERT(stcb);
10842         /*-
10843          * Add an AUTH chunk, if chunk requires it and save the offset into
10844          * the chain for AUTH
10845          */
10846         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10847             stcb->asoc.peer_auth_chunks)) {
10848                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10849                     stcb, SCTP_ABORT_ASSOCIATION);
10850                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10851         } else {
10852                 m_out = NULL;
10853         }
10854         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10855         if (m_abort == NULL) {
10856                 if (m_out) {
10857                         sctp_m_freem(m_out);
10858                 }
10859                 if (operr) {
10860                         sctp_m_freem(operr);
10861                 }
10862                 return;
10863         }
10864         /* link in any error */
10865         SCTP_BUF_NEXT(m_abort) = operr;
10866         cause_len = 0;
10867         m_last = NULL;
10868         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10869                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10870                 if (SCTP_BUF_NEXT(m) == NULL) {
10871                         m_last = m;
10872                 }
10873         }
10874         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10875         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10876         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10877         if (m_out == NULL) {
10878                 /* NO Auth chunk prepended, so reserve space in front */
10879                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10880                 m_out = m_abort;
10881         } else {
10882                 /* Put AUTH chunk at the front of the chain */
10883                 SCTP_BUF_NEXT(m_end) = m_abort;
10884         }
10885         if (stcb->asoc.alternate) {
10886                 net = stcb->asoc.alternate;
10887         } else {
10888                 net = stcb->asoc.primary_destination;
10889         }
10890         /* Fill in the ABORT chunk header. */
10891         abort = mtod(m_abort, struct sctp_abort_chunk *);
10892         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10893         if (stcb->asoc.peer_vtag == 0) {
10894                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10895                 vtag = stcb->asoc.my_vtag;
10896                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10897         } else {
10898                 vtag = stcb->asoc.peer_vtag;
10899                 abort->ch.chunk_flags = 0;
10900         }
10901         abort->ch.chunk_length = htons(chunk_len);
10902         /* Add padding, if necessary. */
10903         if (padding_len > 0) {
10904                 if ((m_last == NULL) ||
10905                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10906                         sctp_m_freem(m_out);
10907                         return;
10908                 }
10909         }
10910         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10911             (struct sockaddr *)&net->ro._l_addr,
10912             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10913             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10914             stcb->asoc.primary_destination->port, NULL,
10915             0, 0,
10916             so_locked);
10917         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10918 }
10919
10920 void
10921 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10922     struct sctp_nets *net,
10923     int reflect_vtag)
10924 {
10925         /* formulate and SEND a SHUTDOWN-COMPLETE */
10926         struct mbuf *m_shutdown_comp;
10927         struct sctp_shutdown_complete_chunk *shutdown_complete;
10928         uint32_t vtag;
10929         uint8_t flags;
10930
10931         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10932         if (m_shutdown_comp == NULL) {
10933                 /* no mbuf's */
10934                 return;
10935         }
10936         if (reflect_vtag) {
10937                 flags = SCTP_HAD_NO_TCB;
10938                 vtag = stcb->asoc.my_vtag;
10939         } else {
10940                 flags = 0;
10941                 vtag = stcb->asoc.peer_vtag;
10942         }
10943         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10944         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10945         shutdown_complete->ch.chunk_flags = flags;
10946         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10947         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10948         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10949             (struct sockaddr *)&net->ro._l_addr,
10950             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10951             stcb->sctp_ep->sctp_lport, stcb->rport,
10952             htonl(vtag),
10953             net->port, NULL,
10954             0, 0,
10955             SCTP_SO_NOT_LOCKED);
10956         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10957         return;
10958 }
10959
10960 static void
10961 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10962     struct sctphdr *sh, uint32_t vtag,
10963     uint8_t type, struct mbuf *cause,
10964     uint8_t use_mflowid, uint32_t mflowid,
10965     uint32_t vrf_id, uint16_t port)
10966 {
10967         struct mbuf *o_pak;
10968         struct mbuf *mout;
10969         struct sctphdr *shout;
10970         struct sctp_chunkhdr *ch;
10971
10972 #if defined(INET) || defined(INET6)
10973         struct udphdr *udp;
10974         int ret;
10975
10976 #endif
10977         int len, cause_len, padding_len;
10978
10979 #ifdef INET
10980         struct sockaddr_in *src_sin, *dst_sin;
10981         struct ip *ip;
10982
10983 #endif
10984 #ifdef INET6
10985         struct sockaddr_in6 *src_sin6, *dst_sin6;
10986         struct ip6_hdr *ip6;
10987
10988 #endif
10989
10990         /* Compute the length of the cause and add final padding. */
10991         cause_len = 0;
10992         if (cause != NULL) {
10993                 struct mbuf *m_at, *m_last = NULL;
10994
10995                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10996                         if (SCTP_BUF_NEXT(m_at) == NULL)
10997                                 m_last = m_at;
10998                         cause_len += SCTP_BUF_LEN(m_at);
10999                 }
11000                 padding_len = cause_len % 4;
11001                 if (padding_len != 0) {
11002                         padding_len = 4 - padding_len;
11003                 }
11004                 if (padding_len != 0) {
11005                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11006                                 sctp_m_freem(cause);
11007                                 return;
11008                         }
11009                 }
11010         } else {
11011                 padding_len = 0;
11012         }
11013         /* Get an mbuf for the header. */
11014         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11015         switch (dst->sa_family) {
11016 #ifdef INET
11017         case AF_INET:
11018                 len += sizeof(struct ip);
11019                 break;
11020 #endif
11021 #ifdef INET6
11022         case AF_INET6:
11023                 len += sizeof(struct ip6_hdr);
11024                 break;
11025 #endif
11026         default:
11027                 break;
11028         }
11029 #if defined(INET) || defined(INET6)
11030         if (port) {
11031                 len += sizeof(struct udphdr);
11032         }
11033 #endif
11034         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11035         if (mout == NULL) {
11036                 if (cause) {
11037                         sctp_m_freem(cause);
11038                 }
11039                 return;
11040         }
11041         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11042         SCTP_BUF_LEN(mout) = len;
11043         SCTP_BUF_NEXT(mout) = cause;
11044         if (use_mflowid != 0) {
11045                 mout->m_pkthdr.flowid = mflowid;
11046                 mout->m_flags |= M_FLOWID;
11047         }
11048 #ifdef INET
11049         ip = NULL;
11050 #endif
11051 #ifdef INET6
11052         ip6 = NULL;
11053 #endif
11054         switch (dst->sa_family) {
11055 #ifdef INET
11056         case AF_INET:
11057                 src_sin = (struct sockaddr_in *)src;
11058                 dst_sin = (struct sockaddr_in *)dst;
11059                 ip = mtod(mout, struct ip *);
11060                 ip->ip_v = IPVERSION;
11061                 ip->ip_hl = (sizeof(struct ip) >> 2);
11062                 ip->ip_tos = 0;
11063                 ip->ip_id = ip_newid();
11064                 ip->ip_off = 0;
11065                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11066                 if (port) {
11067                         ip->ip_p = IPPROTO_UDP;
11068                 } else {
11069                         ip->ip_p = IPPROTO_SCTP;
11070                 }
11071                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11072                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11073                 ip->ip_sum = 0;
11074                 len = sizeof(struct ip);
11075                 shout = (struct sctphdr *)((caddr_t)ip + len);
11076                 break;
11077 #endif
11078 #ifdef INET6
11079         case AF_INET6:
11080                 src_sin6 = (struct sockaddr_in6 *)src;
11081                 dst_sin6 = (struct sockaddr_in6 *)dst;
11082                 ip6 = mtod(mout, struct ip6_hdr *);
11083                 ip6->ip6_flow = htonl(0x60000000);
11084                 if (V_ip6_auto_flowlabel) {
11085                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11086                 }
11087                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11088                 if (port) {
11089                         ip6->ip6_nxt = IPPROTO_UDP;
11090                 } else {
11091                         ip6->ip6_nxt = IPPROTO_SCTP;
11092                 }
11093                 ip6->ip6_src = dst_sin6->sin6_addr;
11094                 ip6->ip6_dst = src_sin6->sin6_addr;
11095                 len = sizeof(struct ip6_hdr);
11096                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11097                 break;
11098 #endif
11099         default:
11100                 len = 0;
11101                 shout = mtod(mout, struct sctphdr *);
11102                 break;
11103         }
11104 #if defined(INET) || defined(INET6)
11105         if (port) {
11106                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11107                         sctp_m_freem(mout);
11108                         return;
11109                 }
11110                 udp = (struct udphdr *)shout;
11111                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11112                 udp->uh_dport = port;
11113                 udp->uh_sum = 0;
11114                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11115                     sizeof(struct sctphdr) +
11116                     sizeof(struct sctp_chunkhdr) +
11117                     cause_len + padding_len);
11118                 len += sizeof(struct udphdr);
11119                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11120         } else {
11121                 udp = NULL;
11122         }
11123 #endif
11124         shout->src_port = sh->dest_port;
11125         shout->dest_port = sh->src_port;
11126         shout->checksum = 0;
11127         if (vtag) {
11128                 shout->v_tag = htonl(vtag);
11129         } else {
11130                 shout->v_tag = sh->v_tag;
11131         }
11132         len += sizeof(struct sctphdr);
11133         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11134         ch->chunk_type = type;
11135         if (vtag) {
11136                 ch->chunk_flags = 0;
11137         } else {
11138                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11139         }
11140         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11141         len += sizeof(struct sctp_chunkhdr);
11142         len += cause_len + padding_len;
11143
11144         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11145                 sctp_m_freem(mout);
11146                 return;
11147         }
11148         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11149         switch (dst->sa_family) {
11150 #ifdef INET
11151         case AF_INET:
11152                 if (port) {
11153                         if (V_udp_cksum) {
11154                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11155                         } else {
11156                                 udp->uh_sum = 0;
11157                         }
11158                 }
11159                 ip->ip_len = htons(len);
11160                 if (port) {
11161 #if defined(SCTP_WITH_NO_CSUM)
11162                         SCTP_STAT_INCR(sctps_sendnocrc);
11163 #else
11164                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11165                         SCTP_STAT_INCR(sctps_sendswcrc);
11166 #endif
11167                         if (V_udp_cksum) {
11168                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11169                         }
11170                 } else {
11171 #if defined(SCTP_WITH_NO_CSUM)
11172                         SCTP_STAT_INCR(sctps_sendnocrc);
11173 #else
11174                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11175                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11176                         SCTP_STAT_INCR(sctps_sendhwcrc);
11177 #endif
11178                 }
11179 #ifdef SCTP_PACKET_LOGGING
11180                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11181                         sctp_packet_log(o_pak);
11182                 }
11183 #endif
11184                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11185                 break;
11186 #endif
11187 #ifdef INET6
11188         case AF_INET6:
11189                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11190                 if (port) {
11191 #if defined(SCTP_WITH_NO_CSUM)
11192                         SCTP_STAT_INCR(sctps_sendnocrc);
11193 #else
11194                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11195                         SCTP_STAT_INCR(sctps_sendswcrc);
11196 #endif
11197                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11198                                 udp->uh_sum = 0xffff;
11199                         }
11200                 } else {
11201 #if defined(SCTP_WITH_NO_CSUM)
11202                         SCTP_STAT_INCR(sctps_sendnocrc);
11203 #else
11204                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11205                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11206                         SCTP_STAT_INCR(sctps_sendhwcrc);
11207 #endif
11208                 }
11209 #ifdef SCTP_PACKET_LOGGING
11210                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11211                         sctp_packet_log(o_pak);
11212                 }
11213 #endif
11214                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11215                 break;
11216 #endif
11217         default:
11218                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11219                     dst->sa_family);
11220                 sctp_m_freem(mout);
11221                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11222                 return;
11223         }
11224         SCTP_STAT_INCR(sctps_sendpackets);
11225         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11226         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11227         return;
11228 }
11229
11230 void
11231 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11232     struct sctphdr *sh,
11233     uint8_t use_mflowid, uint32_t mflowid,
11234     uint32_t vrf_id, uint16_t port)
11235 {
11236         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11237             use_mflowid, mflowid,
11238             vrf_id, port);
11239 }
11240
11241 void
11242 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11243 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11244     SCTP_UNUSED
11245 #endif
11246 )
11247 {
11248         struct sctp_tmit_chunk *chk;
11249         struct sctp_heartbeat_chunk *hb;
11250         struct timeval now;
11251
11252         SCTP_TCB_LOCK_ASSERT(stcb);
11253         if (net == NULL) {
11254                 return;
11255         }
11256         (void)SCTP_GETTIME_TIMEVAL(&now);
11257         switch (net->ro._l_addr.sa.sa_family) {
11258 #ifdef INET
11259         case AF_INET:
11260                 break;
11261 #endif
11262 #ifdef INET6
11263         case AF_INET6:
11264                 break;
11265 #endif
11266         default:
11267                 return;
11268         }
11269         sctp_alloc_a_chunk(stcb, chk);
11270         if (chk == NULL) {
11271                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11272                 return;
11273         }
11274         chk->copy_by_ref = 0;
11275         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11276         chk->rec.chunk_id.can_take_data = 1;
11277         chk->asoc = &stcb->asoc;
11278         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11279
11280         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11281         if (chk->data == NULL) {
11282                 sctp_free_a_chunk(stcb, chk, so_locked);
11283                 return;
11284         }
11285         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11286         SCTP_BUF_LEN(chk->data) = chk->send_size;
11287         chk->sent = SCTP_DATAGRAM_UNSENT;
11288         chk->snd_count = 0;
11289         chk->whoTo = net;
11290         atomic_add_int(&chk->whoTo->ref_count, 1);
11291         /* Now we have a mbuf that we can fill in with the details */
11292         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11293         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11294         /* fill out chunk header */
11295         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11296         hb->ch.chunk_flags = 0;
11297         hb->ch.chunk_length = htons(chk->send_size);
11298         /* Fill out hb parameter */
11299         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11300         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11301         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11302         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11303         /* Did our user request this one, put it in */
11304         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11305         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11306         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11307                 /*
11308                  * we only take from the entropy pool if the address is not
11309                  * confirmed.
11310                  */
11311                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11312                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11313         } else {
11314                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11315                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11316         }
11317         switch (net->ro._l_addr.sa.sa_family) {
11318 #ifdef INET
11319         case AF_INET:
11320                 memcpy(hb->heartbeat.hb_info.address,
11321                     &net->ro._l_addr.sin.sin_addr,
11322                     sizeof(net->ro._l_addr.sin.sin_addr));
11323                 break;
11324 #endif
11325 #ifdef INET6
11326         case AF_INET6:
11327                 memcpy(hb->heartbeat.hb_info.address,
11328                     &net->ro._l_addr.sin6.sin6_addr,
11329                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11330                 break;
11331 #endif
11332         default:
11333                 return;
11334                 break;
11335         }
11336         net->hb_responded = 0;
11337         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11338         stcb->asoc.ctrl_queue_cnt++;
11339         SCTP_STAT_INCR(sctps_sendheartbeat);
11340         return;
11341 }
11342
11343 void
11344 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11345     uint32_t high_tsn)
11346 {
11347         struct sctp_association *asoc;
11348         struct sctp_ecne_chunk *ecne;
11349         struct sctp_tmit_chunk *chk;
11350
11351         if (net == NULL) {
11352                 return;
11353         }
11354         asoc = &stcb->asoc;
11355         SCTP_TCB_LOCK_ASSERT(stcb);
11356         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11357                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11358                         /* found a previous ECN_ECHO update it if needed */
11359                         uint32_t cnt, ctsn;
11360
11361                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11362                         ctsn = ntohl(ecne->tsn);
11363                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11364                                 ecne->tsn = htonl(high_tsn);
11365                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11366                         }
11367                         cnt = ntohl(ecne->num_pkts_since_cwr);
11368                         cnt++;
11369                         ecne->num_pkts_since_cwr = htonl(cnt);
11370                         return;
11371                 }
11372         }
11373         /* nope could not find one to update so we must build one */
11374         sctp_alloc_a_chunk(stcb, chk);
11375         if (chk == NULL) {
11376                 return;
11377         }
11378         chk->copy_by_ref = 0;
11379         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11380         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11381         chk->rec.chunk_id.can_take_data = 0;
11382         chk->asoc = &stcb->asoc;
11383         chk->send_size = sizeof(struct sctp_ecne_chunk);
11384         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11385         if (chk->data == NULL) {
11386                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11387                 return;
11388         }
11389         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11390         SCTP_BUF_LEN(chk->data) = chk->send_size;
11391         chk->sent = SCTP_DATAGRAM_UNSENT;
11392         chk->snd_count = 0;
11393         chk->whoTo = net;
11394         atomic_add_int(&chk->whoTo->ref_count, 1);
11395
11396         stcb->asoc.ecn_echo_cnt_onq++;
11397         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11398         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11399         ecne->ch.chunk_flags = 0;
11400         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11401         ecne->tsn = htonl(high_tsn);
11402         ecne->num_pkts_since_cwr = htonl(1);
11403         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11404         asoc->ctrl_queue_cnt++;
11405 }
11406
11407 void
11408 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11409     struct mbuf *m, int len, int iphlen, int bad_crc)
11410 {
11411         struct sctp_association *asoc;
11412         struct sctp_pktdrop_chunk *drp;
11413         struct sctp_tmit_chunk *chk;
11414         uint8_t *datap;
11415         int was_trunc = 0;
11416         int fullsz = 0;
11417         long spc;
11418         int offset;
11419         struct sctp_chunkhdr *ch, chunk_buf;
11420         unsigned int chk_length;
11421
11422         if (!stcb) {
11423                 return;
11424         }
11425         asoc = &stcb->asoc;
11426         SCTP_TCB_LOCK_ASSERT(stcb);
11427         if (asoc->pktdrop_supported == 0) {
11428                 /*-
11429                  * peer must declare support before I send one.
11430                  */
11431                 return;
11432         }
11433         if (stcb->sctp_socket == NULL) {
11434                 return;
11435         }
11436         sctp_alloc_a_chunk(stcb, chk);
11437         if (chk == NULL) {
11438                 return;
11439         }
11440         chk->copy_by_ref = 0;
11441         len -= iphlen;
11442         chk->send_size = len;
11443         /* Validate that we do not have an ABORT in here. */
11444         offset = iphlen + sizeof(struct sctphdr);
11445         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11446             sizeof(*ch), (uint8_t *) & chunk_buf);
11447         while (ch != NULL) {
11448                 chk_length = ntohs(ch->chunk_length);
11449                 if (chk_length < sizeof(*ch)) {
11450                         /* break to abort land */
11451                         break;
11452                 }
11453                 switch (ch->chunk_type) {
11454                 case SCTP_PACKET_DROPPED:
11455                 case SCTP_ABORT_ASSOCIATION:
11456                 case SCTP_INITIATION_ACK:
11457                         /**
11458                          * We don't respond with an PKT-DROP to an ABORT
11459                          * or PKT-DROP. We also do not respond to an
11460                          * INIT-ACK, because we can't know if the initiation
11461                          * tag is correct or not.
11462                          */
11463                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11464                         return;
11465                 default:
11466                         break;
11467                 }
11468                 offset += SCTP_SIZE32(chk_length);
11469                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11470                     sizeof(*ch), (uint8_t *) & chunk_buf);
11471         }
11472
11473         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11474             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11475                 /*
11476                  * only send 1 mtu worth, trim off the excess on the end.
11477                  */
11478                 fullsz = len;
11479                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11480                 was_trunc = 1;
11481         }
11482         chk->asoc = &stcb->asoc;
11483         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11484         if (chk->data == NULL) {
11485 jump_out:
11486                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11487                 return;
11488         }
11489         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11490         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11491         if (drp == NULL) {
11492                 sctp_m_freem(chk->data);
11493                 chk->data = NULL;
11494                 goto jump_out;
11495         }
11496         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11497             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11498         chk->book_size_scale = 0;
11499         if (was_trunc) {
11500                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11501                 drp->trunc_len = htons(fullsz);
11502                 /*
11503                  * Len is already adjusted to size minus overhead above take
11504                  * out the pkt_drop chunk itself from it.
11505                  */
11506                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11507                 len = chk->send_size;
11508         } else {
11509                 /* no truncation needed */
11510                 drp->ch.chunk_flags = 0;
11511                 drp->trunc_len = htons(0);
11512         }
11513         if (bad_crc) {
11514                 drp->ch.chunk_flags |= SCTP_BADCRC;
11515         }
11516         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11517         SCTP_BUF_LEN(chk->data) = chk->send_size;
11518         chk->sent = SCTP_DATAGRAM_UNSENT;
11519         chk->snd_count = 0;
11520         if (net) {
11521                 /* we should hit here */
11522                 chk->whoTo = net;
11523                 atomic_add_int(&chk->whoTo->ref_count, 1);
11524         } else {
11525                 chk->whoTo = NULL;
11526         }
11527         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11528         chk->rec.chunk_id.can_take_data = 1;
11529         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11530         drp->ch.chunk_length = htons(chk->send_size);
11531         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11532         if (spc < 0) {
11533                 spc = 0;
11534         }
11535         drp->bottle_bw = htonl(spc);
11536         if (asoc->my_rwnd) {
11537                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11538                     asoc->size_on_all_streams +
11539                     asoc->my_rwnd_control_len +
11540                     stcb->sctp_socket->so_rcv.sb_cc);
11541         } else {
11542                 /*-
11543                  * If my rwnd is 0, possibly from mbuf depletion as well as
11544                  * space used, tell the peer there is NO space aka onq == bw
11545                  */
11546                 drp->current_onq = htonl(spc);
11547         }
11548         drp->reserved = 0;
11549         datap = drp->data;
11550         m_copydata(m, iphlen, len, (caddr_t)datap);
11551         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11552         asoc->ctrl_queue_cnt++;
11553 }
11554
11555 void
11556 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11557 {
11558         struct sctp_association *asoc;
11559         struct sctp_cwr_chunk *cwr;
11560         struct sctp_tmit_chunk *chk;
11561
11562         SCTP_TCB_LOCK_ASSERT(stcb);
11563         if (net == NULL) {
11564                 return;
11565         }
11566         asoc = &stcb->asoc;
11567         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11568                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11569                         /*
11570                          * found a previous CWR queued to same destination
11571                          * update it if needed
11572                          */
11573                         uint32_t ctsn;
11574
11575                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11576                         ctsn = ntohl(cwr->tsn);
11577                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11578                                 cwr->tsn = htonl(high_tsn);
11579                         }
11580                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11581                                 /* Make sure override is carried */
11582                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11583                         }
11584                         return;
11585                 }
11586         }
11587         sctp_alloc_a_chunk(stcb, chk);
11588         if (chk == NULL) {
11589                 return;
11590         }
11591         chk->copy_by_ref = 0;
11592         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11593         chk->rec.chunk_id.can_take_data = 1;
11594         chk->asoc = &stcb->asoc;
11595         chk->send_size = sizeof(struct sctp_cwr_chunk);
11596         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11597         if (chk->data == NULL) {
11598                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11599                 return;
11600         }
11601         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11602         SCTP_BUF_LEN(chk->data) = chk->send_size;
11603         chk->sent = SCTP_DATAGRAM_UNSENT;
11604         chk->snd_count = 0;
11605         chk->whoTo = net;
11606         atomic_add_int(&chk->whoTo->ref_count, 1);
11607         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11608         cwr->ch.chunk_type = SCTP_ECN_CWR;
11609         cwr->ch.chunk_flags = override;
11610         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11611         cwr->tsn = htonl(high_tsn);
11612         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11613         asoc->ctrl_queue_cnt++;
11614 }
11615
11616 void
11617 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11618     int number_entries, uint16_t * list,
11619     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11620 {
11621         uint16_t len, old_len, i;
11622         struct sctp_stream_reset_out_request *req_out;
11623         struct sctp_chunkhdr *ch;
11624
11625         ch = mtod(chk->data, struct sctp_chunkhdr *);
11626         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11627
11628         /* get to new offset for the param. */
11629         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11630         /* now how long will this param be? */
11631         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11632         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11633         req_out->ph.param_length = htons(len);
11634         req_out->request_seq = htonl(seq);
11635         req_out->response_seq = htonl(resp_seq);
11636         req_out->send_reset_at_tsn = htonl(last_sent);
11637         if (number_entries) {
11638                 for (i = 0; i < number_entries; i++) {
11639                         req_out->list_of_streams[i] = htons(list[i]);
11640                 }
11641         }
11642         if (SCTP_SIZE32(len) > len) {
11643                 /*-
11644                  * Need to worry about the pad we may end up adding to the
11645                  * end. This is easy since the struct is either aligned to 4
11646                  * bytes or 2 bytes off.
11647                  */
11648                 req_out->list_of_streams[number_entries] = 0;
11649         }
11650         /* now fix the chunk length */
11651         ch->chunk_length = htons(len + old_len);
11652         chk->book_size = len + old_len;
11653         chk->book_size_scale = 0;
11654         chk->send_size = SCTP_SIZE32(chk->book_size);
11655         SCTP_BUF_LEN(chk->data) = chk->send_size;
11656         return;
11657 }
11658
11659 static void
11660 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11661     int number_entries, uint16_t * list,
11662     uint32_t seq)
11663 {
11664         uint16_t len, old_len, i;
11665         struct sctp_stream_reset_in_request *req_in;
11666         struct sctp_chunkhdr *ch;
11667
11668         ch = mtod(chk->data, struct sctp_chunkhdr *);
11669         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11670
11671         /* get to new offset for the param. */
11672         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11673         /* now how long will this param be? */
11674         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11675         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11676         req_in->ph.param_length = htons(len);
11677         req_in->request_seq = htonl(seq);
11678         if (number_entries) {
11679                 for (i = 0; i < number_entries; i++) {
11680                         req_in->list_of_streams[i] = htons(list[i]);
11681                 }
11682         }
11683         if (SCTP_SIZE32(len) > len) {
11684                 /*-
11685                  * Need to worry about the pad we may end up adding to the
11686                  * end. This is easy since the struct is either aligned to 4
11687                  * bytes or 2 bytes off.
11688                  */
11689                 req_in->list_of_streams[number_entries] = 0;
11690         }
11691         /* now fix the chunk length */
11692         ch->chunk_length = htons(len + old_len);
11693         chk->book_size = len + old_len;
11694         chk->book_size_scale = 0;
11695         chk->send_size = SCTP_SIZE32(chk->book_size);
11696         SCTP_BUF_LEN(chk->data) = chk->send_size;
11697         return;
11698 }
11699
11700 static void
11701 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11702     uint32_t seq)
11703 {
11704         uint16_t len, old_len;
11705         struct sctp_stream_reset_tsn_request *req_tsn;
11706         struct sctp_chunkhdr *ch;
11707
11708         ch = mtod(chk->data, struct sctp_chunkhdr *);
11709         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11710
11711         /* get to new offset for the param. */
11712         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11713         /* now how long will this param be? */
11714         len = sizeof(struct sctp_stream_reset_tsn_request);
11715         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11716         req_tsn->ph.param_length = htons(len);
11717         req_tsn->request_seq = htonl(seq);
11718
11719         /* now fix the chunk length */
11720         ch->chunk_length = htons(len + old_len);
11721         chk->send_size = len + old_len;
11722         chk->book_size = SCTP_SIZE32(chk->send_size);
11723         chk->book_size_scale = 0;
11724         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11725         return;
11726 }
11727
11728 void
11729 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11730     uint32_t resp_seq, uint32_t result)
11731 {
11732         uint16_t len, old_len;
11733         struct sctp_stream_reset_response *resp;
11734         struct sctp_chunkhdr *ch;
11735
11736         ch = mtod(chk->data, struct sctp_chunkhdr *);
11737         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11738
11739         /* get to new offset for the param. */
11740         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11741         /* now how long will this param be? */
11742         len = sizeof(struct sctp_stream_reset_response);
11743         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11744         resp->ph.param_length = htons(len);
11745         resp->response_seq = htonl(resp_seq);
11746         resp->result = ntohl(result);
11747
11748         /* now fix the chunk length */
11749         ch->chunk_length = htons(len + old_len);
11750         chk->book_size = len + old_len;
11751         chk->book_size_scale = 0;
11752         chk->send_size = SCTP_SIZE32(chk->book_size);
11753         SCTP_BUF_LEN(chk->data) = chk->send_size;
11754         return;
11755 }
11756
11757 void
11758 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11759     uint32_t resp_seq, uint32_t result,
11760     uint32_t send_una, uint32_t recv_next)
11761 {
11762         uint16_t len, old_len;
11763         struct sctp_stream_reset_response_tsn *resp;
11764         struct sctp_chunkhdr *ch;
11765
11766         ch = mtod(chk->data, struct sctp_chunkhdr *);
11767         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11768
11769         /* get to new offset for the param. */
11770         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11771         /* now how long will this param be? */
11772         len = sizeof(struct sctp_stream_reset_response_tsn);
11773         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11774         resp->ph.param_length = htons(len);
11775         resp->response_seq = htonl(resp_seq);
11776         resp->result = htonl(result);
11777         resp->senders_next_tsn = htonl(send_una);
11778         resp->receivers_next_tsn = htonl(recv_next);
11779
11780         /* now fix the chunk length */
11781         ch->chunk_length = htons(len + old_len);
11782         chk->book_size = len + old_len;
11783         chk->send_size = SCTP_SIZE32(chk->book_size);
11784         chk->book_size_scale = 0;
11785         SCTP_BUF_LEN(chk->data) = chk->send_size;
11786         return;
11787 }
11788
11789 static void
11790 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11791     uint32_t seq,
11792     uint16_t adding)
11793 {
11794         uint16_t len, old_len;
11795         struct sctp_chunkhdr *ch;
11796         struct sctp_stream_reset_add_strm *addstr;
11797
11798         ch = mtod(chk->data, struct sctp_chunkhdr *);
11799         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11800
11801         /* get to new offset for the param. */
11802         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11803         /* now how long will this param be? */
11804         len = sizeof(struct sctp_stream_reset_add_strm);
11805
11806         /* Fill it out. */
11807         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11808         addstr->ph.param_length = htons(len);
11809         addstr->request_seq = htonl(seq);
11810         addstr->number_of_streams = htons(adding);
11811         addstr->reserved = 0;
11812
11813         /* now fix the chunk length */
11814         ch->chunk_length = htons(len + old_len);
11815         chk->send_size = len + old_len;
11816         chk->book_size = SCTP_SIZE32(chk->send_size);
11817         chk->book_size_scale = 0;
11818         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11819         return;
11820 }
11821
11822 static void
11823 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11824     uint32_t seq,
11825     uint16_t adding)
11826 {
11827         uint16_t len, old_len;
11828         struct sctp_chunkhdr *ch;
11829         struct sctp_stream_reset_add_strm *addstr;
11830
11831         ch = mtod(chk->data, struct sctp_chunkhdr *);
11832         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11833
11834         /* get to new offset for the param. */
11835         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11836         /* now how long will this param be? */
11837         len = sizeof(struct sctp_stream_reset_add_strm);
11838         /* Fill it out. */
11839         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11840         addstr->ph.param_length = htons(len);
11841         addstr->request_seq = htonl(seq);
11842         addstr->number_of_streams = htons(adding);
11843         addstr->reserved = 0;
11844
11845         /* now fix the chunk length */
11846         ch->chunk_length = htons(len + old_len);
11847         chk->send_size = len + old_len;
11848         chk->book_size = SCTP_SIZE32(chk->send_size);
11849         chk->book_size_scale = 0;
11850         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11851         return;
11852 }
11853
11854 int
11855 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11856     int number_entries, uint16_t * list,
11857     uint8_t send_out_req,
11858     uint8_t send_in_req,
11859     uint8_t send_tsn_req,
11860     uint8_t add_stream,
11861     uint16_t adding_o,
11862     uint16_t adding_i, uint8_t peer_asked)
11863 {
11864
11865         struct sctp_association *asoc;
11866         struct sctp_tmit_chunk *chk;
11867         struct sctp_chunkhdr *ch;
11868         uint32_t seq;
11869
11870         asoc = &stcb->asoc;
11871         if (asoc->stream_reset_outstanding) {
11872                 /*-
11873                  * Already one pending, must get ACK back to clear the flag.
11874                  */
11875                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11876                 return (EBUSY);
11877         }
11878         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11879             (add_stream == 0)) {
11880                 /* nothing to do */
11881                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11882                 return (EINVAL);
11883         }
11884         if (send_tsn_req && (send_out_req || send_in_req)) {
11885                 /* error, can't do that */
11886                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11887                 return (EINVAL);
11888         }
11889         sctp_alloc_a_chunk(stcb, chk);
11890         if (chk == NULL) {
11891                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11892                 return (ENOMEM);
11893         }
11894         chk->copy_by_ref = 0;
11895         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11896         chk->rec.chunk_id.can_take_data = 0;
11897         chk->asoc = &stcb->asoc;
11898         chk->book_size = sizeof(struct sctp_chunkhdr);
11899         chk->send_size = SCTP_SIZE32(chk->book_size);
11900         chk->book_size_scale = 0;
11901
11902         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11903         if (chk->data == NULL) {
11904                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11905                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11906                 return (ENOMEM);
11907         }
11908         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11909
11910         /* setup chunk parameters */
11911         chk->sent = SCTP_DATAGRAM_UNSENT;
11912         chk->snd_count = 0;
11913         if (stcb->asoc.alternate) {
11914                 chk->whoTo = stcb->asoc.alternate;
11915         } else {
11916                 chk->whoTo = stcb->asoc.primary_destination;
11917         }
11918         atomic_add_int(&chk->whoTo->ref_count, 1);
11919         ch = mtod(chk->data, struct sctp_chunkhdr *);
11920         ch->chunk_type = SCTP_STREAM_RESET;
11921         ch->chunk_flags = 0;
11922         ch->chunk_length = htons(chk->book_size);
11923         SCTP_BUF_LEN(chk->data) = chk->send_size;
11924
11925         seq = stcb->asoc.str_reset_seq_out;
11926         if (send_out_req) {
11927                 sctp_add_stream_reset_out(chk, number_entries, list,
11928                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11929                 asoc->stream_reset_out_is_outstanding = 1;
11930                 seq++;
11931                 asoc->stream_reset_outstanding++;
11932         }
11933         if ((add_stream & 1) &&
11934             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11935                 /* Need to allocate more */
11936                 struct sctp_stream_out *oldstream;
11937                 struct sctp_stream_queue_pending *sp, *nsp;
11938                 int i;
11939
11940 #if defined(SCTP_DETAILED_STR_STATS)
11941                 int j;
11942
11943 #endif
11944
11945                 oldstream = stcb->asoc.strmout;
11946                 /* get some more */
11947                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11948                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11949                     SCTP_M_STRMO);
11950                 if (stcb->asoc.strmout == NULL) {
11951                         uint8_t x;
11952
11953                         stcb->asoc.strmout = oldstream;
11954                         /* Turn off the bit */
11955                         x = add_stream & 0xfe;
11956                         add_stream = x;
11957                         goto skip_stuff;
11958                 }
11959                 /*
11960                  * Ok now we proceed with copying the old out stuff and
11961                  * initializing the new stuff.
11962                  */
11963                 SCTP_TCB_SEND_LOCK(stcb);
11964                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11965                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11966                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11967                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11968                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11969                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11970                         stcb->asoc.strmout[i].stream_no = i;
11971                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11972                         /* now anything on those queues? */
11973                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11974                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11975                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11976                         }
11977                         /* Now move assoc pointers too */
11978                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11979                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11980                         }
11981                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11982                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11983                         }
11984                 }
11985                 /* now the new streams */
11986                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11987                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11988                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11989                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11990 #if defined(SCTP_DETAILED_STR_STATS)
11991                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
11992                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
11993                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
11994                         }
11995 #else
11996                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
11997                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
11998 #endif
11999                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12000                         stcb->asoc.strmout[i].stream_no = i;
12001                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12002                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12003                 }
12004                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12005                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12006                 SCTP_TCB_SEND_UNLOCK(stcb);
12007         }
12008 skip_stuff:
12009         if ((add_stream & 1) && (adding_o > 0)) {
12010                 asoc->strm_pending_add_size = adding_o;
12011                 asoc->peer_req_out = peer_asked;
12012                 sctp_add_an_out_stream(chk, seq, adding_o);
12013                 seq++;
12014                 asoc->stream_reset_outstanding++;
12015         }
12016         if ((add_stream & 2) && (adding_i > 0)) {
12017                 sctp_add_an_in_stream(chk, seq, adding_i);
12018                 seq++;
12019                 asoc->stream_reset_outstanding++;
12020         }
12021         if (send_in_req) {
12022                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12023                 seq++;
12024                 asoc->stream_reset_outstanding++;
12025         }
12026         if (send_tsn_req) {
12027                 sctp_add_stream_reset_tsn(chk, seq);
12028                 asoc->stream_reset_outstanding++;
12029         }
12030         asoc->str_reset = chk;
12031         /* insert the chunk for sending */
12032         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12033             chk,
12034             sctp_next);
12035         asoc->ctrl_queue_cnt++;
12036         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12037         return (0);
12038 }
12039
12040 void
12041 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12042     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12043     uint8_t use_mflowid, uint32_t mflowid,
12044     uint32_t vrf_id, uint16_t port)
12045 {
12046         /* Don't respond to an ABORT with an ABORT. */
12047         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12048                 if (cause)
12049                         sctp_m_freem(cause);
12050                 return;
12051         }
12052         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12053             use_mflowid, mflowid,
12054             vrf_id, port);
12055         return;
12056 }
12057
12058 void
12059 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12060     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12061     uint8_t use_mflowid, uint32_t mflowid,
12062     uint32_t vrf_id, uint16_t port)
12063 {
12064         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12065             use_mflowid, mflowid,
12066             vrf_id, port);
12067         return;
12068 }
12069
12070 static struct mbuf *
12071 sctp_copy_resume(struct uio *uio,
12072     int max_send_len,
12073     int user_marks_eor,
12074     int *error,
12075     uint32_t * sndout,
12076     struct mbuf **new_tail)
12077 {
12078         struct mbuf *m;
12079
12080         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12081             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12082         if (m == NULL) {
12083                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12084                 *error = ENOBUFS;
12085         } else {
12086                 *sndout = m_length(m, NULL);
12087                 *new_tail = m_last(m);
12088         }
12089         return (m);
12090 }
12091
12092 static int
12093 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12094     struct uio *uio,
12095     int resv_upfront)
12096 {
12097         int left;
12098
12099         left = sp->length;
12100         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12101             resv_upfront, 0);
12102         if (sp->data == NULL) {
12103                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12104                 return (ENOBUFS);
12105         }
12106         sp->tail_mbuf = m_last(sp->data);
12107         return (0);
12108 }
12109
12110
12111
12112 static struct sctp_stream_queue_pending *
12113 sctp_copy_it_in(struct sctp_tcb *stcb,
12114     struct sctp_association *asoc,
12115     struct sctp_sndrcvinfo *srcv,
12116     struct uio *uio,
12117     struct sctp_nets *net,
12118     int max_send_len,
12119     int user_marks_eor,
12120     int *error)
12121 {
12122         /*-
12123          * This routine must be very careful in its work. Protocol
12124          * processing is up and running so care must be taken to spl...()
12125          * when you need to do something that may effect the stcb/asoc. The
12126          * sb is locked however. When data is copied the protocol processing
12127          * should be enabled since this is a slower operation...
12128          */
12129         struct sctp_stream_queue_pending *sp = NULL;
12130         int resv_in_first;
12131
12132         *error = 0;
12133         /* Now can we send this? */
12134         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12135             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12136             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12137             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12138                 /* got data while shutting down */
12139                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12140                 *error = ECONNRESET;
12141                 goto out_now;
12142         }
12143         sctp_alloc_a_strmoq(stcb, sp);
12144         if (sp == NULL) {
12145                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12146                 *error = ENOMEM;
12147                 goto out_now;
12148         }
12149         sp->act_flags = 0;
12150         sp->sender_all_done = 0;
12151         sp->sinfo_flags = srcv->sinfo_flags;
12152         sp->timetolive = srcv->sinfo_timetolive;
12153         sp->ppid = srcv->sinfo_ppid;
12154         sp->context = srcv->sinfo_context;
12155         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12156
12157         sp->stream = srcv->sinfo_stream;
12158         sp->length = min(uio->uio_resid, max_send_len);
12159         if ((sp->length == (uint32_t) uio->uio_resid) &&
12160             ((user_marks_eor == 0) ||
12161             (srcv->sinfo_flags & SCTP_EOF) ||
12162             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12163                 sp->msg_is_complete = 1;
12164         } else {
12165                 sp->msg_is_complete = 0;
12166         }
12167         sp->sender_all_done = 0;
12168         sp->some_taken = 0;
12169         sp->put_last_out = 0;
12170         resv_in_first = sizeof(struct sctp_data_chunk);
12171         sp->data = sp->tail_mbuf = NULL;
12172         if (sp->length == 0) {
12173                 *error = 0;
12174                 goto skip_copy;
12175         }
12176         if (srcv->sinfo_keynumber_valid) {
12177                 sp->auth_keyid = srcv->sinfo_keynumber;
12178         } else {
12179                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12180         }
12181         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12182                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12183                 sp->holds_key_ref = 1;
12184         }
12185         *error = sctp_copy_one(sp, uio, resv_in_first);
12186 skip_copy:
12187         if (*error) {
12188                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12189                 sp = NULL;
12190         } else {
12191                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12192                         sp->net = net;
12193                         atomic_add_int(&sp->net->ref_count, 1);
12194                 } else {
12195                         sp->net = NULL;
12196                 }
12197                 sctp_set_prsctp_policy(sp);
12198         }
12199 out_now:
12200         return (sp);
12201 }
12202
12203
12204 int
12205 sctp_sosend(struct socket *so,
12206     struct sockaddr *addr,
12207     struct uio *uio,
12208     struct mbuf *top,
12209     struct mbuf *control,
12210     int flags,
12211     struct thread *p
12212 )
12213 {
12214         int error, use_sndinfo = 0;
12215         struct sctp_sndrcvinfo sndrcvninfo;
12216         struct sockaddr *addr_to_use;
12217
12218 #if defined(INET) && defined(INET6)
12219         struct sockaddr_in sin;
12220
12221 #endif
12222
12223         if (control) {
12224                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12225                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12226                     sizeof(sndrcvninfo))) {
12227                         /* got one */
12228                         use_sndinfo = 1;
12229                 }
12230         }
12231         addr_to_use = addr;
12232 #if defined(INET) && defined(INET6)
12233         if ((addr) && (addr->sa_family == AF_INET6)) {
12234                 struct sockaddr_in6 *sin6;
12235
12236                 sin6 = (struct sockaddr_in6 *)addr;
12237                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12238                         in6_sin6_2_sin(&sin, sin6);
12239                         addr_to_use = (struct sockaddr *)&sin;
12240                 }
12241         }
12242 #endif
12243         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12244             control,
12245             flags,
12246             use_sndinfo ? &sndrcvninfo : NULL
12247             ,p
12248             );
12249         return (error);
12250 }
12251
12252
12253 int
12254 sctp_lower_sosend(struct socket *so,
12255     struct sockaddr *addr,
12256     struct uio *uio,
12257     struct mbuf *i_pak,
12258     struct mbuf *control,
12259     int flags,
12260     struct sctp_sndrcvinfo *srcv
12261     ,
12262     struct thread *p
12263 )
12264 {
12265         unsigned int sndlen = 0, max_len;
12266         int error, len;
12267         struct mbuf *top = NULL;
12268         int queue_only = 0, queue_only_for_init = 0;
12269         int free_cnt_applied = 0;
12270         int un_sent;
12271         int now_filled = 0;
12272         unsigned int inqueue_bytes = 0;
12273         struct sctp_block_entry be;
12274         struct sctp_inpcb *inp;
12275         struct sctp_tcb *stcb = NULL;
12276         struct timeval now;
12277         struct sctp_nets *net;
12278         struct sctp_association *asoc;
12279         struct sctp_inpcb *t_inp;
12280         int user_marks_eor;
12281         int create_lock_applied = 0;
12282         int nagle_applies = 0;
12283         int some_on_control = 0;
12284         int got_all_of_the_send = 0;
12285         int hold_tcblock = 0;
12286         int non_blocking = 0;
12287         uint32_t local_add_more, local_soresv = 0;
12288         uint16_t port;
12289         uint16_t sinfo_flags;
12290         sctp_assoc_t sinfo_assoc_id;
12291
12292         error = 0;
12293         net = NULL;
12294         stcb = NULL;
12295         asoc = NULL;
12296
12297         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12298         if (inp == NULL) {
12299                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12300                 error = EINVAL;
12301                 if (i_pak) {
12302                         SCTP_RELEASE_PKT(i_pak);
12303                 }
12304                 return (error);
12305         }
12306         if ((uio == NULL) && (i_pak == NULL)) {
12307                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12308                 return (EINVAL);
12309         }
12310         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12311         atomic_add_int(&inp->total_sends, 1);
12312         if (uio) {
12313                 if (uio->uio_resid < 0) {
12314                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12315                         return (EINVAL);
12316                 }
12317                 sndlen = uio->uio_resid;
12318         } else {
12319                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12320                 sndlen = SCTP_HEADER_LEN(i_pak);
12321         }
12322         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12323             (void *)addr,
12324             sndlen);
12325         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12326             (inp->sctp_socket->so_qlimit)) {
12327                 /* The listener can NOT send */
12328                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12329                 error = ENOTCONN;
12330                 goto out_unlocked;
12331         }
12332         /**
12333          * Pre-screen address, if one is given the sin-len
12334          * must be set correctly!
12335          */
12336         if (addr) {
12337                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12338
12339                 switch (raddr->sa.sa_family) {
12340 #ifdef INET
12341                 case AF_INET:
12342                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12343                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12344                                 error = EINVAL;
12345                                 goto out_unlocked;
12346                         }
12347                         port = raddr->sin.sin_port;
12348                         break;
12349 #endif
12350 #ifdef INET6
12351                 case AF_INET6:
12352                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12353                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12354                                 error = EINVAL;
12355                                 goto out_unlocked;
12356                         }
12357                         port = raddr->sin6.sin6_port;
12358                         break;
12359 #endif
12360                 default:
12361                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12362                         error = EAFNOSUPPORT;
12363                         goto out_unlocked;
12364                 }
12365         } else
12366                 port = 0;
12367
12368         if (srcv) {
12369                 sinfo_flags = srcv->sinfo_flags;
12370                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12371                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12372                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12373                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12374                         error = EINVAL;
12375                         goto out_unlocked;
12376                 }
12377                 if (srcv->sinfo_flags)
12378                         SCTP_STAT_INCR(sctps_sends_with_flags);
12379         } else {
12380                 sinfo_flags = inp->def_send.sinfo_flags;
12381                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12382         }
12383         if (sinfo_flags & SCTP_SENDALL) {
12384                 /* its a sendall */
12385                 error = sctp_sendall(inp, uio, top, srcv);
12386                 top = NULL;
12387                 goto out_unlocked;
12388         }
12389         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12390                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12391                 error = EINVAL;
12392                 goto out_unlocked;
12393         }
12394         /* now we must find the assoc */
12395         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12396             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12397                 SCTP_INP_RLOCK(inp);
12398                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12399                 if (stcb) {
12400                         SCTP_TCB_LOCK(stcb);
12401                         hold_tcblock = 1;
12402                 }
12403                 SCTP_INP_RUNLOCK(inp);
12404         } else if (sinfo_assoc_id) {
12405                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12406         } else if (addr) {
12407                 /*-
12408                  * Since we did not use findep we must
12409                  * increment it, and if we don't find a tcb
12410                  * decrement it.
12411                  */
12412                 SCTP_INP_WLOCK(inp);
12413                 SCTP_INP_INCR_REF(inp);
12414                 SCTP_INP_WUNLOCK(inp);
12415                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12416                 if (stcb == NULL) {
12417                         SCTP_INP_WLOCK(inp);
12418                         SCTP_INP_DECR_REF(inp);
12419                         SCTP_INP_WUNLOCK(inp);
12420                 } else {
12421                         hold_tcblock = 1;
12422                 }
12423         }
12424         if ((stcb == NULL) && (addr)) {
12425                 /* Possible implicit send? */
12426                 SCTP_ASOC_CREATE_LOCK(inp);
12427                 create_lock_applied = 1;
12428                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12429                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12430                         /* Should I really unlock ? */
12431                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12432                         error = EINVAL;
12433                         goto out_unlocked;
12434
12435                 }
12436                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12437                     (addr->sa_family == AF_INET6)) {
12438                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12439                         error = EINVAL;
12440                         goto out_unlocked;
12441                 }
12442                 SCTP_INP_WLOCK(inp);
12443                 SCTP_INP_INCR_REF(inp);
12444                 SCTP_INP_WUNLOCK(inp);
12445                 /* With the lock applied look again */
12446                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12447                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12448                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12449                 }
12450                 if (stcb == NULL) {
12451                         SCTP_INP_WLOCK(inp);
12452                         SCTP_INP_DECR_REF(inp);
12453                         SCTP_INP_WUNLOCK(inp);
12454                 } else {
12455                         hold_tcblock = 1;
12456                 }
12457                 if (error) {
12458                         goto out_unlocked;
12459                 }
12460                 if (t_inp != inp) {
12461                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12462                         error = ENOTCONN;
12463                         goto out_unlocked;
12464                 }
12465         }
12466         if (stcb == NULL) {
12467                 if (addr == NULL) {
12468                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12469                         error = ENOENT;
12470                         goto out_unlocked;
12471                 } else {
12472                         /* We must go ahead and start the INIT process */
12473                         uint32_t vrf_id;
12474
12475                         if ((sinfo_flags & SCTP_ABORT) ||
12476                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12477                                 /*-
12478                                  * User asks to abort a non-existant assoc,
12479                                  * or EOF a non-existant assoc with no data
12480                                  */
12481                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12482                                 error = ENOENT;
12483                                 goto out_unlocked;
12484                         }
12485                         /* get an asoc/stcb struct */
12486                         vrf_id = inp->def_vrf_id;
12487 #ifdef INVARIANTS
12488                         if (create_lock_applied == 0) {
12489                                 panic("Error, should hold create lock and I don't?");
12490                         }
12491 #endif
12492                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12493                             p
12494                             );
12495                         if (stcb == NULL) {
12496                                 /* Error is setup for us in the call */
12497                                 goto out_unlocked;
12498                         }
12499                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12500                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12501                                 /*
12502                                  * Set the connected flag so we can queue
12503                                  * data
12504                                  */
12505                                 soisconnecting(so);
12506                         }
12507                         hold_tcblock = 1;
12508                         if (create_lock_applied) {
12509                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12510                                 create_lock_applied = 0;
12511                         } else {
12512                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12513                         }
12514                         /*
12515                          * Turn on queue only flag to prevent data from
12516                          * being sent
12517                          */
12518                         queue_only = 1;
12519                         asoc = &stcb->asoc;
12520                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12521                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12522
12523                         /* initialize authentication params for the assoc */
12524                         sctp_initialize_auth_params(inp, stcb);
12525
12526                         if (control) {
12527                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12528                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12529                                         hold_tcblock = 0;
12530                                         stcb = NULL;
12531                                         goto out_unlocked;
12532                                 }
12533                         }
12534                         /* out with the INIT */
12535                         queue_only_for_init = 1;
12536                         /*-
12537                          * we may want to dig in after this call and adjust the MTU
12538                          * value. It defaulted to 1500 (constant) but the ro
12539                          * structure may now have an update and thus we may need to
12540                          * change it BEFORE we append the message.
12541                          */
12542                 }
12543         } else
12544                 asoc = &stcb->asoc;
12545         if (srcv == NULL)
12546                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12547         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12548                 if (addr)
12549                         net = sctp_findnet(stcb, addr);
12550                 else
12551                         net = NULL;
12552                 if ((net == NULL) ||
12553                     ((port != 0) && (port != stcb->rport))) {
12554                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12555                         error = EINVAL;
12556                         goto out_unlocked;
12557                 }
12558         } else {
12559                 if (stcb->asoc.alternate) {
12560                         net = stcb->asoc.alternate;
12561                 } else {
12562                         net = stcb->asoc.primary_destination;
12563                 }
12564         }
12565         atomic_add_int(&stcb->total_sends, 1);
12566         /* Keep the stcb from being freed under our feet */
12567         atomic_add_int(&asoc->refcnt, 1);
12568         free_cnt_applied = 1;
12569
12570         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12571                 if (sndlen > asoc->smallest_mtu) {
12572                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12573                         error = EMSGSIZE;
12574                         goto out_unlocked;
12575                 }
12576         }
12577         if (SCTP_SO_IS_NBIO(so)
12578             || (flags & MSG_NBIO)
12579             ) {
12580                 non_blocking = 1;
12581         }
12582         /* would we block? */
12583         if (non_blocking) {
12584                 if (hold_tcblock == 0) {
12585                         SCTP_TCB_LOCK(stcb);
12586                         hold_tcblock = 1;
12587                 }
12588                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12589                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12590                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12591                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12592                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12593                                 error = EMSGSIZE;
12594                         else
12595                                 error = EWOULDBLOCK;
12596                         goto out_unlocked;
12597                 }
12598                 stcb->asoc.sb_send_resv += sndlen;
12599                 SCTP_TCB_UNLOCK(stcb);
12600                 hold_tcblock = 0;
12601         } else {
12602                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12603         }
12604         local_soresv = sndlen;
12605         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12606                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12607                 error = ECONNRESET;
12608                 goto out_unlocked;
12609         }
12610         if (create_lock_applied) {
12611                 SCTP_ASOC_CREATE_UNLOCK(inp);
12612                 create_lock_applied = 0;
12613         }
12614         if (asoc->stream_reset_outstanding) {
12615                 /*
12616                  * Can't queue any data while stream reset is underway.
12617                  */
12618                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12619                 error = EAGAIN;
12620                 goto out_unlocked;
12621         }
12622         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12623             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12624                 queue_only = 1;
12625         }
12626         /* we are now done with all control */
12627         if (control) {
12628                 sctp_m_freem(control);
12629                 control = NULL;
12630         }
12631         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12632             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12633             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12634             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12635                 if (srcv->sinfo_flags & SCTP_ABORT) {
12636                         ;
12637                 } else {
12638                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12639                         error = ECONNRESET;
12640                         goto out_unlocked;
12641                 }
12642         }
12643         /* Ok, we will attempt a msgsnd :> */
12644         if (p) {
12645                 p->td_ru.ru_msgsnd++;
12646         }
12647         /* Are we aborting? */
12648         if (srcv->sinfo_flags & SCTP_ABORT) {
12649                 struct mbuf *mm;
12650                 int tot_demand, tot_out = 0, max_out;
12651
12652                 SCTP_STAT_INCR(sctps_sends_with_abort);
12653                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12654                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12655                         /* It has to be up before we abort */
12656                         /* how big is the user initiated abort? */
12657                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12658                         error = EINVAL;
12659                         goto out;
12660                 }
12661                 if (hold_tcblock) {
12662                         SCTP_TCB_UNLOCK(stcb);
12663                         hold_tcblock = 0;
12664                 }
12665                 if (top) {
12666                         struct mbuf *cntm = NULL;
12667
12668                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12669                         if (sndlen != 0) {
12670                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12671                                         tot_out += SCTP_BUF_LEN(cntm);
12672                                 }
12673                         }
12674                 } else {
12675                         /* Must fit in a MTU */
12676                         tot_out = sndlen;
12677                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12678                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12679                                 /* To big */
12680                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12681                                 error = EMSGSIZE;
12682                                 goto out;
12683                         }
12684                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12685                 }
12686                 if (mm == NULL) {
12687                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12688                         error = ENOMEM;
12689                         goto out;
12690                 }
12691                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12692                 max_out -= sizeof(struct sctp_abort_msg);
12693                 if (tot_out > max_out) {
12694                         tot_out = max_out;
12695                 }
12696                 if (mm) {
12697                         struct sctp_paramhdr *ph;
12698
12699                         /* now move forward the data pointer */
12700                         ph = mtod(mm, struct sctp_paramhdr *);
12701                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12702                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12703                         ph++;
12704                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12705                         if (top == NULL) {
12706                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12707                                 if (error) {
12708                                         /*-
12709                                          * Here if we can't get his data we
12710                                          * still abort we just don't get to
12711                                          * send the users note :-0
12712                                          */
12713                                         sctp_m_freem(mm);
12714                                         mm = NULL;
12715                                 }
12716                         } else {
12717                                 if (sndlen != 0) {
12718                                         SCTP_BUF_NEXT(mm) = top;
12719                                 }
12720                         }
12721                 }
12722                 if (hold_tcblock == 0) {
12723                         SCTP_TCB_LOCK(stcb);
12724                 }
12725                 atomic_add_int(&stcb->asoc.refcnt, -1);
12726                 free_cnt_applied = 0;
12727                 /* release this lock, otherwise we hang on ourselves */
12728                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12729                 /* now relock the stcb so everything is sane */
12730                 hold_tcblock = 0;
12731                 stcb = NULL;
12732                 /*
12733                  * In this case top is already chained to mm avoid double
12734                  * free, since we free it below if top != NULL and driver
12735                  * would free it after sending the packet out
12736                  */
12737                 if (sndlen != 0) {
12738                         top = NULL;
12739                 }
12740                 goto out_unlocked;
12741         }
12742         /* Calculate the maximum we can send */
12743         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12744         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12745                 if (non_blocking) {
12746                         /* we already checked for non-blocking above. */
12747                         max_len = sndlen;
12748                 } else {
12749                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12750                 }
12751         } else {
12752                 max_len = 0;
12753         }
12754         if (hold_tcblock) {
12755                 SCTP_TCB_UNLOCK(stcb);
12756                 hold_tcblock = 0;
12757         }
12758         /* Is the stream no. valid? */
12759         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12760                 /* Invalid stream number */
12761                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12762                 error = EINVAL;
12763                 goto out_unlocked;
12764         }
12765         if (asoc->strmout == NULL) {
12766                 /* huh? software error */
12767                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12768                 error = EFAULT;
12769                 goto out_unlocked;
12770         }
12771         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12772         if ((user_marks_eor == 0) &&
12773             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12774                 /* It will NEVER fit */
12775                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12776                 error = EMSGSIZE;
12777                 goto out_unlocked;
12778         }
12779         if ((uio == NULL) && user_marks_eor) {
12780                 /*-
12781                  * We do not support eeor mode for
12782                  * sending with mbuf chains (like sendfile).
12783                  */
12784                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12785                 error = EINVAL;
12786                 goto out_unlocked;
12787         }
12788         if (user_marks_eor) {
12789                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12790         } else {
12791                 /*-
12792                  * For non-eeor the whole message must fit in
12793                  * the socket send buffer.
12794                  */
12795                 local_add_more = sndlen;
12796         }
12797         len = 0;
12798         if (non_blocking) {
12799                 goto skip_preblock;
12800         }
12801         if (((max_len <= local_add_more) &&
12802             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12803             (max_len == 0) ||
12804             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12805                 /* No room right now ! */
12806                 SOCKBUF_LOCK(&so->so_snd);
12807                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12808                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12809                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12810                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12811                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12812                             inqueue_bytes,
12813                             local_add_more,
12814                             stcb->asoc.stream_queue_cnt,
12815                             stcb->asoc.chunks_on_out_queue,
12816                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12817                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12818                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12819                         }
12820                         be.error = 0;
12821                         stcb->block_entry = &be;
12822                         error = sbwait(&so->so_snd);
12823                         stcb->block_entry = NULL;
12824                         if (error || so->so_error || be.error) {
12825                                 if (error == 0) {
12826                                         if (so->so_error)
12827                                                 error = so->so_error;
12828                                         if (be.error) {
12829                                                 error = be.error;
12830                                         }
12831                                 }
12832                                 SOCKBUF_UNLOCK(&so->so_snd);
12833                                 goto out_unlocked;
12834                         }
12835                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12836                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12837                                     asoc, stcb->asoc.total_output_queue_size);
12838                         }
12839                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12840                                 goto out_unlocked;
12841                         }
12842                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12843                 }
12844                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12845                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12846                 } else {
12847                         max_len = 0;
12848                 }
12849                 SOCKBUF_UNLOCK(&so->so_snd);
12850         }
12851 skip_preblock:
12852         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12853                 goto out_unlocked;
12854         }
12855         /*
12856          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12857          * case NOTE: uio will be null when top/mbuf is passed
12858          */
12859         if (sndlen == 0) {
12860                 if (srcv->sinfo_flags & SCTP_EOF) {
12861                         got_all_of_the_send = 1;
12862                         goto dataless_eof;
12863                 } else {
12864                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12865                         error = EINVAL;
12866                         goto out;
12867                 }
12868         }
12869         if (top == NULL) {
12870                 struct sctp_stream_queue_pending *sp;
12871                 struct sctp_stream_out *strm;
12872                 uint32_t sndout;
12873
12874                 SCTP_TCB_SEND_LOCK(stcb);
12875                 if ((asoc->stream_locked) &&
12876                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12877                         SCTP_TCB_SEND_UNLOCK(stcb);
12878                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12879                         error = EINVAL;
12880                         goto out;
12881                 }
12882                 SCTP_TCB_SEND_UNLOCK(stcb);
12883
12884                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12885                 if (strm->last_msg_incomplete == 0) {
12886         do_a_copy_in:
12887                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12888                         if ((sp == NULL) || (error)) {
12889                                 goto out;
12890                         }
12891                         SCTP_TCB_SEND_LOCK(stcb);
12892                         if (sp->msg_is_complete) {
12893                                 strm->last_msg_incomplete = 0;
12894                                 asoc->stream_locked = 0;
12895                         } else {
12896                                 /*
12897                                  * Just got locked to this guy in case of an
12898                                  * interrupt.
12899                                  */
12900                                 strm->last_msg_incomplete = 1;
12901                                 asoc->stream_locked = 1;
12902                                 asoc->stream_locked_on = srcv->sinfo_stream;
12903                                 sp->sender_all_done = 0;
12904                         }
12905                         sctp_snd_sb_alloc(stcb, sp->length);
12906                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12907                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12908                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12909                         }
12910                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12911                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12912                         SCTP_TCB_SEND_UNLOCK(stcb);
12913                 } else {
12914                         SCTP_TCB_SEND_LOCK(stcb);
12915                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12916                         SCTP_TCB_SEND_UNLOCK(stcb);
12917                         if (sp == NULL) {
12918                                 /* ???? Huh ??? last msg is gone */
12919 #ifdef INVARIANTS
12920                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12921 #else
12922                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12923                                 strm->last_msg_incomplete = 0;
12924 #endif
12925                                 goto do_a_copy_in;
12926
12927                         }
12928                 }
12929                 while (uio->uio_resid > 0) {
12930                         /* How much room do we have? */
12931                         struct mbuf *new_tail, *mm;
12932
12933                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12934                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12935                         else
12936                                 max_len = 0;
12937
12938                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12939                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12940                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12941                                 sndout = 0;
12942                                 new_tail = NULL;
12943                                 if (hold_tcblock) {
12944                                         SCTP_TCB_UNLOCK(stcb);
12945                                         hold_tcblock = 0;
12946                                 }
12947                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12948                                 if ((mm == NULL) || error) {
12949                                         if (mm) {
12950                                                 sctp_m_freem(mm);
12951                                         }
12952                                         goto out;
12953                                 }
12954                                 /* Update the mbuf and count */
12955                                 SCTP_TCB_SEND_LOCK(stcb);
12956                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12957                                         /*
12958                                          * we need to get out. Peer probably
12959                                          * aborted.
12960                                          */
12961                                         sctp_m_freem(mm);
12962                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12963                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12964                                                 error = ECONNRESET;
12965                                         }
12966                                         SCTP_TCB_SEND_UNLOCK(stcb);
12967                                         goto out;
12968                                 }
12969                                 if (sp->tail_mbuf) {
12970                                         /* tack it to the end */
12971                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12972                                         sp->tail_mbuf = new_tail;
12973                                 } else {
12974                                         /* A stolen mbuf */
12975                                         sp->data = mm;
12976                                         sp->tail_mbuf = new_tail;
12977                                 }
12978                                 sctp_snd_sb_alloc(stcb, sndout);
12979                                 atomic_add_int(&sp->length, sndout);
12980                                 len += sndout;
12981
12982                                 /* Did we reach EOR? */
12983                                 if ((uio->uio_resid == 0) &&
12984                                     ((user_marks_eor == 0) ||
12985                                     (srcv->sinfo_flags & SCTP_EOF) ||
12986                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12987                                         sp->msg_is_complete = 1;
12988                                 } else {
12989                                         sp->msg_is_complete = 0;
12990                                 }
12991                                 SCTP_TCB_SEND_UNLOCK(stcb);
12992                         }
12993                         if (uio->uio_resid == 0) {
12994                                 /* got it all? */
12995                                 continue;
12996                         }
12997                         /* PR-SCTP? */
12998                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
12999                                 /*
13000                                  * This is ugly but we must assure locking
13001                                  * order
13002                                  */
13003                                 if (hold_tcblock == 0) {
13004                                         SCTP_TCB_LOCK(stcb);
13005                                         hold_tcblock = 1;
13006                                 }
13007                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13008                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13009                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13010                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13011                                 else
13012                                         max_len = 0;
13013                                 if (max_len > 0) {
13014                                         continue;
13015                                 }
13016                                 SCTP_TCB_UNLOCK(stcb);
13017                                 hold_tcblock = 0;
13018                         }
13019                         /* wait for space now */
13020                         if (non_blocking) {
13021                                 /* Non-blocking io in place out */
13022                                 goto skip_out_eof;
13023                         }
13024                         /* What about the INIT, send it maybe */
13025                         if (queue_only_for_init) {
13026                                 if (hold_tcblock == 0) {
13027                                         SCTP_TCB_LOCK(stcb);
13028                                         hold_tcblock = 1;
13029                                 }
13030                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13031                                         /* a collision took us forward? */
13032                                         queue_only = 0;
13033                                 } else {
13034                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13035                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13036                                         queue_only = 1;
13037                                 }
13038                         }
13039                         if ((net->flight_size > net->cwnd) &&
13040                             (asoc->sctp_cmt_on_off == 0)) {
13041                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13042                                 queue_only = 1;
13043                         } else if (asoc->ifp_had_enobuf) {
13044                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13045                                 if (net->flight_size > (2 * net->mtu)) {
13046                                         queue_only = 1;
13047                                 }
13048                                 asoc->ifp_had_enobuf = 0;
13049                         }
13050                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13051                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13052                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13053                             (stcb->asoc.total_flight > 0) &&
13054                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13055                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13056
13057                                 /*-
13058                                  * Ok, Nagle is set on and we have data outstanding.
13059                                  * Don't send anything and let SACKs drive out the
13060                                  * data unless wen have a "full" segment to send.
13061                                  */
13062                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13063                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13064                                 }
13065                                 SCTP_STAT_INCR(sctps_naglequeued);
13066                                 nagle_applies = 1;
13067                         } else {
13068                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13069                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13070                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13071                                 }
13072                                 SCTP_STAT_INCR(sctps_naglesent);
13073                                 nagle_applies = 0;
13074                         }
13075                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13076
13077                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13078                                     nagle_applies, un_sent);
13079                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13080                                     stcb->asoc.total_flight,
13081                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13082                         }
13083                         if (queue_only_for_init)
13084                                 queue_only_for_init = 0;
13085                         if ((queue_only == 0) && (nagle_applies == 0)) {
13086                                 /*-
13087                                  * need to start chunk output
13088                                  * before blocking.. note that if
13089                                  * a lock is already applied, then
13090                                  * the input via the net is happening
13091                                  * and I don't need to start output :-D
13092                                  */
13093                                 if (hold_tcblock == 0) {
13094                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13095                                                 hold_tcblock = 1;
13096                                                 sctp_chunk_output(inp,
13097                                                     stcb,
13098                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13099                                         }
13100                                 } else {
13101                                         sctp_chunk_output(inp,
13102                                             stcb,
13103                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13104                                 }
13105                                 if (hold_tcblock == 1) {
13106                                         SCTP_TCB_UNLOCK(stcb);
13107                                         hold_tcblock = 0;
13108                                 }
13109                         }
13110                         SOCKBUF_LOCK(&so->so_snd);
13111                         /*-
13112                          * This is a bit strange, but I think it will
13113                          * work. The total_output_queue_size is locked and
13114                          * protected by the TCB_LOCK, which we just released.
13115                          * There is a race that can occur between releasing it
13116                          * above, and me getting the socket lock, where sacks
13117                          * come in but we have not put the SB_WAIT on the
13118                          * so_snd buffer to get the wakeup. After the LOCK
13119                          * is applied the sack_processing will also need to
13120                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13121                          * once we have the socket buffer lock if we recheck the
13122                          * size we KNOW we will get to sleep safely with the
13123                          * wakeup flag in place.
13124                          */
13125                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13126                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13127                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13128                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13129                                             asoc, uio->uio_resid);
13130                                 }
13131                                 be.error = 0;
13132                                 stcb->block_entry = &be;
13133                                 error = sbwait(&so->so_snd);
13134                                 stcb->block_entry = NULL;
13135
13136                                 if (error || so->so_error || be.error) {
13137                                         if (error == 0) {
13138                                                 if (so->so_error)
13139                                                         error = so->so_error;
13140                                                 if (be.error) {
13141                                                         error = be.error;
13142                                                 }
13143                                         }
13144                                         SOCKBUF_UNLOCK(&so->so_snd);
13145                                         goto out_unlocked;
13146                                 }
13147                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13148                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13149                                             asoc, stcb->asoc.total_output_queue_size);
13150                                 }
13151                         }
13152                         SOCKBUF_UNLOCK(&so->so_snd);
13153                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13154                                 goto out_unlocked;
13155                         }
13156                 }
13157                 SCTP_TCB_SEND_LOCK(stcb);
13158                 if (sp) {
13159                         if (sp->msg_is_complete == 0) {
13160                                 strm->last_msg_incomplete = 1;
13161                                 asoc->stream_locked = 1;
13162                                 asoc->stream_locked_on = srcv->sinfo_stream;
13163                         } else {
13164                                 sp->sender_all_done = 1;
13165                                 strm->last_msg_incomplete = 0;
13166                                 asoc->stream_locked = 0;
13167                         }
13168                 } else {
13169                         SCTP_PRINTF("Huh no sp TSNH?\n");
13170                         strm->last_msg_incomplete = 0;
13171                         asoc->stream_locked = 0;
13172                 }
13173                 SCTP_TCB_SEND_UNLOCK(stcb);
13174                 if (uio->uio_resid == 0) {
13175                         got_all_of_the_send = 1;
13176                 }
13177         } else {
13178                 /* We send in a 0, since we do NOT have any locks */
13179                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13180                 top = NULL;
13181                 if (srcv->sinfo_flags & SCTP_EOF) {
13182                         /*
13183                          * This should only happen for Panda for the mbuf
13184                          * send case, which does NOT yet support EEOR mode.
13185                          * Thus, we can just set this flag to do the proper
13186                          * EOF handling.
13187                          */
13188                         got_all_of_the_send = 1;
13189                 }
13190         }
13191         if (error) {
13192                 goto out;
13193         }
13194 dataless_eof:
13195         /* EOF thing ? */
13196         if ((srcv->sinfo_flags & SCTP_EOF) &&
13197             (got_all_of_the_send == 1)) {
13198                 int cnt;
13199
13200                 SCTP_STAT_INCR(sctps_sends_with_eof);
13201                 error = 0;
13202                 if (hold_tcblock == 0) {
13203                         SCTP_TCB_LOCK(stcb);
13204                         hold_tcblock = 1;
13205                 }
13206                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13207                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13208                     TAILQ_EMPTY(&asoc->sent_queue) &&
13209                     (cnt == 0)) {
13210                         if (asoc->locked_on_sending) {
13211                                 goto abort_anyway;
13212                         }
13213                         /* there is nothing queued to send, so I'm done... */
13214                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13215                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13216                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13217                                 struct sctp_nets *netp;
13218
13219                                 /* only send SHUTDOWN the first time through */
13220                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13221                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13222                                 }
13223                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13224                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13225                                 sctp_stop_timers_for_shutdown(stcb);
13226                                 if (stcb->asoc.alternate) {
13227                                         netp = stcb->asoc.alternate;
13228                                 } else {
13229                                         netp = stcb->asoc.primary_destination;
13230                                 }
13231                                 sctp_send_shutdown(stcb, netp);
13232                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13233                                     netp);
13234                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13235                                     asoc->primary_destination);
13236                         }
13237                 } else {
13238                         /*-
13239                          * we still got (or just got) data to send, so set
13240                          * SHUTDOWN_PENDING
13241                          */
13242                         /*-
13243                          * XXX sockets draft says that SCTP_EOF should be
13244                          * sent with no data.  currently, we will allow user
13245                          * data to be sent first and move to
13246                          * SHUTDOWN-PENDING
13247                          */
13248                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13249                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13250                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13251                                 if (hold_tcblock == 0) {
13252                                         SCTP_TCB_LOCK(stcb);
13253                                         hold_tcblock = 1;
13254                                 }
13255                                 if (asoc->locked_on_sending) {
13256                                         /* Locked to send out the data */
13257                                         struct sctp_stream_queue_pending *sp;
13258
13259                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13260                                         if (sp) {
13261                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13262                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13263                                         }
13264                                 }
13265                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13266                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13267                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13268                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13269                         abort_anyway:
13270                                         if (free_cnt_applied) {
13271                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13272                                                 free_cnt_applied = 0;
13273                                         }
13274                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13275                                             NULL, SCTP_SO_LOCKED);
13276                                         /*
13277                                          * now relock the stcb so everything
13278                                          * is sane
13279                                          */
13280                                         hold_tcblock = 0;
13281                                         stcb = NULL;
13282                                         goto out;
13283                                 }
13284                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13285                                     asoc->primary_destination);
13286                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13287                         }
13288                 }
13289         }
13290 skip_out_eof:
13291         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13292                 some_on_control = 1;
13293         }
13294         if (queue_only_for_init) {
13295                 if (hold_tcblock == 0) {
13296                         SCTP_TCB_LOCK(stcb);
13297                         hold_tcblock = 1;
13298                 }
13299                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13300                         /* a collision took us forward? */
13301                         queue_only = 0;
13302                 } else {
13303                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13304                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13305                         queue_only = 1;
13306                 }
13307         }
13308         if ((net->flight_size > net->cwnd) &&
13309             (stcb->asoc.sctp_cmt_on_off == 0)) {
13310                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13311                 queue_only = 1;
13312         } else if (asoc->ifp_had_enobuf) {
13313                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13314                 if (net->flight_size > (2 * net->mtu)) {
13315                         queue_only = 1;
13316                 }
13317                 asoc->ifp_had_enobuf = 0;
13318         }
13319         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13320             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13321         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13322             (stcb->asoc.total_flight > 0) &&
13323             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13324             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13325                 /*-
13326                  * Ok, Nagle is set on and we have data outstanding.
13327                  * Don't send anything and let SACKs drive out the
13328                  * data unless wen have a "full" segment to send.
13329                  */
13330                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13331                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13332                 }
13333                 SCTP_STAT_INCR(sctps_naglequeued);
13334                 nagle_applies = 1;
13335         } else {
13336                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13337                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13338                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13339                 }
13340                 SCTP_STAT_INCR(sctps_naglesent);
13341                 nagle_applies = 0;
13342         }
13343         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13344                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13345                     nagle_applies, un_sent);
13346                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13347                     stcb->asoc.total_flight,
13348                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13349         }
13350         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13351                 /* we can attempt to send too. */
13352                 if (hold_tcblock == 0) {
13353                         /*
13354                          * If there is activity recv'ing sacks no need to
13355                          * send
13356                          */
13357                         if (SCTP_TCB_TRYLOCK(stcb)) {
13358                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13359                                 hold_tcblock = 1;
13360                         }
13361                 } else {
13362                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13363                 }
13364         } else if ((queue_only == 0) &&
13365                     (stcb->asoc.peers_rwnd == 0) &&
13366             (stcb->asoc.total_flight == 0)) {
13367                 /* We get to have a probe outstanding */
13368                 if (hold_tcblock == 0) {
13369                         hold_tcblock = 1;
13370                         SCTP_TCB_LOCK(stcb);
13371                 }
13372                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13373         } else if (some_on_control) {
13374                 int num_out, reason, frag_point;
13375
13376                 /* Here we do control only */
13377                 if (hold_tcblock == 0) {
13378                         hold_tcblock = 1;
13379                         SCTP_TCB_LOCK(stcb);
13380                 }
13381                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13382                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13383                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13384         }
13385         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13386             queue_only, stcb->asoc.peers_rwnd, un_sent,
13387             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13388             stcb->asoc.total_output_queue_size, error);
13389
13390 out:
13391 out_unlocked:
13392
13393         if (local_soresv && stcb) {
13394                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13395         }
13396         if (create_lock_applied) {
13397                 SCTP_ASOC_CREATE_UNLOCK(inp);
13398         }
13399         if ((stcb) && hold_tcblock) {
13400                 SCTP_TCB_UNLOCK(stcb);
13401         }
13402         if (stcb && free_cnt_applied) {
13403                 atomic_add_int(&stcb->asoc.refcnt, -1);
13404         }
13405 #ifdef INVARIANTS
13406         if (stcb) {
13407                 if (mtx_owned(&stcb->tcb_mtx)) {
13408                         panic("Leaving with tcb mtx owned?");
13409                 }
13410                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13411                         panic("Leaving with tcb send mtx owned?");
13412                 }
13413         }
13414 #endif
13415 #ifdef INVARIANTS
13416         if (inp) {
13417                 sctp_validate_no_locks(inp);
13418         } else {
13419                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13420         }
13421 #endif
13422         if (top) {
13423                 sctp_m_freem(top);
13424         }
13425         if (control) {
13426                 sctp_m_freem(control);
13427         }
13428         return (error);
13429 }
13430
13431
13432 /*
13433  * generate an AUTHentication chunk, if required
13434  */
13435 struct mbuf *
13436 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13437     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13438     struct sctp_tcb *stcb, uint8_t chunk)
13439 {
13440         struct mbuf *m_auth;
13441         struct sctp_auth_chunk *auth;
13442         int chunk_len;
13443         struct mbuf *cn;
13444
13445         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13446             (stcb == NULL))
13447                 return (m);
13448
13449         if (stcb->asoc.auth_supported == 0) {
13450                 return (m);
13451         }
13452         /* does the requested chunk require auth? */
13453         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13454                 return (m);
13455         }
13456         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13457         if (m_auth == NULL) {
13458                 /* no mbuf's */
13459                 return (m);
13460         }
13461         /* reserve some space if this will be the first mbuf */
13462         if (m == NULL)
13463                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13464         /* fill in the AUTH chunk details */
13465         auth = mtod(m_auth, struct sctp_auth_chunk *);
13466         bzero(auth, sizeof(*auth));
13467         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13468         auth->ch.chunk_flags = 0;
13469         chunk_len = sizeof(*auth) +
13470             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13471         auth->ch.chunk_length = htons(chunk_len);
13472         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13473         /* key id and hmac digest will be computed and filled in upon send */
13474
13475         /* save the offset where the auth was inserted into the chain */
13476         *offset = 0;
13477         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13478                 *offset += SCTP_BUF_LEN(cn);
13479         }
13480
13481         /* update length and return pointer to the auth chunk */
13482         SCTP_BUF_LEN(m_auth) = chunk_len;
13483         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13484         if (auth_ret != NULL)
13485                 *auth_ret = auth;
13486
13487         return (m);
13488 }
13489
13490 #ifdef INET6
13491 int
13492 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13493 {
13494         struct nd_prefix *pfx = NULL;
13495         struct nd_pfxrouter *pfxrtr = NULL;
13496         struct sockaddr_in6 gw6;
13497
13498         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13499                 return (0);
13500
13501         /* get prefix entry of address */
13502         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13503                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13504                         continue;
13505                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13506                     &src6->sin6_addr, &pfx->ndpr_mask))
13507                         break;
13508         }
13509         /* no prefix entry in the prefix list */
13510         if (pfx == NULL) {
13511                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13512                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13513                 return (0);
13514         }
13515         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13516         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13517
13518         /* search installed gateway from prefix entry */
13519         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13520                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13521                 gw6.sin6_family = AF_INET6;
13522                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13523                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13524                     sizeof(struct in6_addr));
13525                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13526                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13527                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13528                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13529                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13530                     ro->ro_rt->rt_gateway)) {
13531                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13532                         return (1);
13533                 }
13534         }
13535         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13536         return (0);
13537 }
13538
13539 #endif
13540
13541 int
13542 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13543 {
13544 #ifdef INET
13545         struct sockaddr_in *sin, *mask;
13546         struct ifaddr *ifa;
13547         struct in_addr srcnetaddr, gwnetaddr;
13548
13549         if (ro == NULL || ro->ro_rt == NULL ||
13550             sifa->address.sa.sa_family != AF_INET) {
13551                 return (0);
13552         }
13553         ifa = (struct ifaddr *)sifa->ifa;
13554         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13555         sin = &sifa->address.sin;
13556         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13557         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13558         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13559         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13560
13561         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13562         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13563         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13564         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13565         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13566         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13567                 return (1);
13568         }
13569 #endif
13570         return (0);
13571 }