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 = (struct sockaddr_in *)&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 = (struct sockaddr_in6 *)&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 = (struct sockaddr_in *)&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 = (struct sockaddr_in6 *)&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                                         /* Default is NOT correct */
3622                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3623                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3624                                         SCTP_TCB_UNLOCK(stcb);
3625                                         SCTP_MALLOC(tmp_str,
3626                                             struct sctp_stream_out *,
3627                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3628                                             SCTP_M_STRMO);
3629                                         SCTP_TCB_LOCK(stcb);
3630                                         if (tmp_str != NULL) {
3631                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3632                                                 stcb->asoc.strmout = tmp_str;
3633                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3634                                         } else {
3635                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3636                                         }
3637                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3638                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3639                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3640                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3641                                                 stcb->asoc.strmout[i].stream_no = i;
3642                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3643                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3644                                         }
3645                                 }
3646                                 break;
3647 #ifdef INET
3648                         case SCTP_DSTADDRV4:
3649                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3650                                         *error = EINVAL;
3651                                         return (1);
3652                                 }
3653                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3654                                 sin.sin_family = AF_INET;
3655                                 sin.sin_len = sizeof(struct sockaddr_in);
3656                                 sin.sin_port = stcb->rport;
3657                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3658                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3659                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3660                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3661                                         *error = EINVAL;
3662                                         return (1);
3663                                 }
3664                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3665                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3666                                         *error = ENOBUFS;
3667                                         return (1);
3668                                 }
3669                                 break;
3670 #endif
3671 #ifdef INET6
3672                         case SCTP_DSTADDRV6:
3673                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3674                                         *error = EINVAL;
3675                                         return (1);
3676                                 }
3677                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3678                                 sin6.sin6_family = AF_INET6;
3679                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3680                                 sin6.sin6_port = stcb->rport;
3681                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3682                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3683                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3684                                         *error = EINVAL;
3685                                         return (1);
3686                                 }
3687 #ifdef INET
3688                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3689                                         in6_sin6_2_sin(&sin, &sin6);
3690                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3691                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3692                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3693                                                 *error = EINVAL;
3694                                                 return (1);
3695                                         }
3696                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3697                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3698                                                 *error = ENOBUFS;
3699                                                 return (1);
3700                                         }
3701                                 } else
3702 #endif
3703                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3704                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3705                                         *error = ENOBUFS;
3706                                         return (1);
3707                                 }
3708                                 break;
3709 #endif
3710                         default:
3711                                 break;
3712                         }
3713                 }
3714                 at += CMSG_ALIGN(cmh.cmsg_len);
3715         }
3716         return (0);
3717 }
3718
3719 static struct sctp_tcb *
3720 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3721     uint16_t port,
3722     struct mbuf *control,
3723     struct sctp_nets **net_p,
3724     int *error)
3725 {
3726         struct cmsghdr cmh;
3727         int tlen, at;
3728         struct sctp_tcb *stcb;
3729         struct sockaddr *addr;
3730
3731 #ifdef INET
3732         struct sockaddr_in sin;
3733
3734 #endif
3735 #ifdef INET6
3736         struct sockaddr_in6 sin6;
3737
3738 #endif
3739
3740         tlen = SCTP_BUF_LEN(control);
3741         at = 0;
3742         while (at < tlen) {
3743                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3744                         /* There is not enough room for one more. */
3745                         *error = EINVAL;
3746                         return (NULL);
3747                 }
3748                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3749                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3750                         /* We dont't have a complete CMSG header. */
3751                         *error = EINVAL;
3752                         return (NULL);
3753                 }
3754                 if (((int)cmh.cmsg_len + at) > tlen) {
3755                         /* We don't have the complete CMSG. */
3756                         *error = EINVAL;
3757                         return (NULL);
3758                 }
3759                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3760                         switch (cmh.cmsg_type) {
3761 #ifdef INET
3762                         case SCTP_DSTADDRV4:
3763                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3764                                         *error = EINVAL;
3765                                         return (NULL);
3766                                 }
3767                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3768                                 sin.sin_family = AF_INET;
3769                                 sin.sin_len = sizeof(struct sockaddr_in);
3770                                 sin.sin_port = port;
3771                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3772                                 addr = (struct sockaddr *)&sin;
3773                                 break;
3774 #endif
3775 #ifdef INET6
3776                         case SCTP_DSTADDRV6:
3777                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3778                                         *error = EINVAL;
3779                                         return (NULL);
3780                                 }
3781                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3782                                 sin6.sin6_family = AF_INET6;
3783                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3784                                 sin6.sin6_port = port;
3785                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3786 #ifdef INET
3787                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3788                                         in6_sin6_2_sin(&sin, &sin6);
3789                                         addr = (struct sockaddr *)&sin;
3790                                 } else
3791 #endif
3792                                         addr = (struct sockaddr *)&sin6;
3793                                 break;
3794 #endif
3795                         default:
3796                                 addr = NULL;
3797                                 break;
3798                         }
3799                         if (addr) {
3800                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3801                                 if (stcb != NULL) {
3802                                         return (stcb);
3803                                 }
3804                         }
3805                 }
3806                 at += CMSG_ALIGN(cmh.cmsg_len);
3807         }
3808         return (NULL);
3809 }
3810
3811 static struct mbuf *
3812 sctp_add_cookie(struct mbuf *init, int init_offset,
3813     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3814 {
3815         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3816         struct sctp_state_cookie *stc;
3817         struct sctp_paramhdr *ph;
3818         uint8_t *foo;
3819         int sig_offset;
3820         uint16_t cookie_sz;
3821
3822         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3823             sizeof(struct sctp_paramhdr)), 0,
3824             M_NOWAIT, 1, MT_DATA);
3825         if (mret == NULL) {
3826                 return (NULL);
3827         }
3828         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3829         if (copy_init == NULL) {
3830                 sctp_m_freem(mret);
3831                 return (NULL);
3832         }
3833 #ifdef SCTP_MBUF_LOGGING
3834         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3835                 struct mbuf *mat;
3836
3837                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3838                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3839                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3840                         }
3841                 }
3842         }
3843 #endif
3844         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3845             M_NOWAIT);
3846         if (copy_initack == NULL) {
3847                 sctp_m_freem(mret);
3848                 sctp_m_freem(copy_init);
3849                 return (NULL);
3850         }
3851 #ifdef SCTP_MBUF_LOGGING
3852         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3853                 struct mbuf *mat;
3854
3855                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3856                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3857                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3858                         }
3859                 }
3860         }
3861 #endif
3862         /* easy side we just drop it on the end */
3863         ph = mtod(mret, struct sctp_paramhdr *);
3864         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3865             sizeof(struct sctp_paramhdr);
3866         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3867             sizeof(struct sctp_paramhdr));
3868         ph->param_type = htons(SCTP_STATE_COOKIE);
3869         ph->param_length = 0;   /* fill in at the end */
3870         /* Fill in the stc cookie data */
3871         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3872
3873         /* tack the INIT and then the INIT-ACK onto the chain */
3874         cookie_sz = 0;
3875         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3876                 cookie_sz += SCTP_BUF_LEN(m_at);
3877                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3878                         SCTP_BUF_NEXT(m_at) = copy_init;
3879                         break;
3880                 }
3881         }
3882         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3883                 cookie_sz += SCTP_BUF_LEN(m_at);
3884                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3885                         SCTP_BUF_NEXT(m_at) = copy_initack;
3886                         break;
3887                 }
3888         }
3889         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3890                 cookie_sz += SCTP_BUF_LEN(m_at);
3891                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3892                         break;
3893                 }
3894         }
3895         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3896         if (sig == NULL) {
3897                 /* no space, so free the entire chain */
3898                 sctp_m_freem(mret);
3899                 return (NULL);
3900         }
3901         SCTP_BUF_LEN(sig) = 0;
3902         SCTP_BUF_NEXT(m_at) = sig;
3903         sig_offset = 0;
3904         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3905         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3906         *signature = foo;
3907         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3908         cookie_sz += SCTP_SIGNATURE_SIZE;
3909         ph->param_length = htons(cookie_sz);
3910         return (mret);
3911 }
3912
3913
3914 static uint8_t
3915 sctp_get_ect(struct sctp_tcb *stcb)
3916 {
3917         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3918                 return (SCTP_ECT0_BIT);
3919         } else {
3920                 return (0);
3921         }
3922 }
3923
3924 #if defined(INET) || defined(INET6)
3925 static void
3926 sctp_handle_no_route(struct sctp_tcb *stcb,
3927     struct sctp_nets *net,
3928     int so_locked)
3929 {
3930         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3931
3932         if (net) {
3933                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3934                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3935                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3936                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3937                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3938                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3939                                     stcb, 0,
3940                                     (void *)net,
3941                                     so_locked);
3942                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3943                                 net->dest_state &= ~SCTP_ADDR_PF;
3944                         }
3945                 }
3946                 if (stcb) {
3947                         if (net == stcb->asoc.primary_destination) {
3948                                 /* need a new primary */
3949                                 struct sctp_nets *alt;
3950
3951                                 alt = sctp_find_alternate_net(stcb, net, 0);
3952                                 if (alt != net) {
3953                                         if (stcb->asoc.alternate) {
3954                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3955                                         }
3956                                         stcb->asoc.alternate = alt;
3957                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3958                                         if (net->ro._s_addr) {
3959                                                 sctp_free_ifa(net->ro._s_addr);
3960                                                 net->ro._s_addr = NULL;
3961                                         }
3962                                         net->src_addr_selected = 0;
3963                                 }
3964                         }
3965                 }
3966         }
3967 }
3968
3969 #endif
3970
3971 static int
3972 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3973     struct sctp_tcb *stcb,      /* may be NULL */
3974     struct sctp_nets *net,
3975     struct sockaddr *to,
3976     struct mbuf *m,
3977     uint32_t auth_offset,
3978     struct sctp_auth_chunk *auth,
3979     uint16_t auth_keyid,
3980     int nofragment_flag,
3981     int ecn_ok,
3982     int out_of_asoc_ok,
3983     uint16_t src_port,
3984     uint16_t dest_port,
3985     uint32_t v_tag,
3986     uint16_t port,
3987     union sctp_sockstore *over_addr,
3988     uint8_t use_mflowid, uint32_t mflowid,
3989 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3990     int so_locked SCTP_UNUSED
3991 #else
3992     int so_locked
3993 #endif
3994 )
3995 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3996 {
3997         /**
3998          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3999          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4000          * - fill in the HMAC digest of any AUTH chunk in the packet.
4001          * - calculate and fill in the SCTP checksum.
4002          * - prepend an IP address header.
4003          * - if boundall use INADDR_ANY.
4004          * - if boundspecific do source address selection.
4005          * - set fragmentation option for ipV4.
4006          * - On return from IP output, check/adjust mtu size of output
4007          *   interface and smallest_mtu size as well.
4008          */
4009         /* Will need ifdefs around this */
4010         struct mbuf *newm;
4011         struct sctphdr *sctphdr;
4012         int packet_length;
4013         int ret;
4014
4015 #if defined(INET) || defined(INET6)
4016         uint32_t vrf_id;
4017
4018 #endif
4019 #if defined(INET) || defined(INET6)
4020         struct mbuf *o_pak;
4021         sctp_route_t *ro = NULL;
4022         struct udphdr *udp = NULL;
4023
4024 #endif
4025         uint8_t tos_value;
4026
4027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028         struct socket *so = NULL;
4029
4030 #endif
4031
4032         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4033                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4034                 sctp_m_freem(m);
4035                 return (EFAULT);
4036         }
4037 #if defined(INET) || defined(INET6)
4038         if (stcb) {
4039                 vrf_id = stcb->asoc.vrf_id;
4040         } else {
4041                 vrf_id = inp->def_vrf_id;
4042         }
4043 #endif
4044         /* fill in the HMAC digest for any AUTH chunk in the packet */
4045         if ((auth != NULL) && (stcb != NULL)) {
4046                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4047         }
4048         if (net) {
4049                 tos_value = net->dscp;
4050         } else if (stcb) {
4051                 tos_value = stcb->asoc.default_dscp;
4052         } else {
4053                 tos_value = inp->sctp_ep.default_dscp;
4054         }
4055
4056         switch (to->sa_family) {
4057 #ifdef INET
4058         case AF_INET:
4059                 {
4060                         struct ip *ip = NULL;
4061                         sctp_route_t iproute;
4062                         int len;
4063
4064                         len = sizeof(struct ip) + sizeof(struct sctphdr);
4065                         if (port) {
4066                                 len += sizeof(struct udphdr);
4067                         }
4068                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069                         if (newm == NULL) {
4070                                 sctp_m_freem(m);
4071                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072                                 return (ENOMEM);
4073                         }
4074                         SCTP_ALIGN_TO_END(newm, len);
4075                         SCTP_BUF_LEN(newm) = len;
4076                         SCTP_BUF_NEXT(newm) = m;
4077                         m = newm;
4078                         if (net != NULL) {
4079 #ifdef INVARIANTS
4080                                 if (net->flowidset == 0) {
4081                                         panic("Flow ID not set");
4082                                 }
4083 #endif
4084                                 m->m_pkthdr.flowid = net->flowid;
4085                                 m->m_flags |= M_FLOWID;
4086                         } else {
4087                                 if (use_mflowid != 0) {
4088                                         m->m_pkthdr.flowid = mflowid;
4089                                         m->m_flags |= M_FLOWID;
4090                                 }
4091                         }
4092                         packet_length = sctp_calculate_len(m);
4093                         ip = mtod(m, struct ip *);
4094                         ip->ip_v = IPVERSION;
4095                         ip->ip_hl = (sizeof(struct ip) >> 2);
4096                         if (tos_value == 0) {
4097                                 /*
4098                                  * This means especially, that it is not set
4099                                  * at the SCTP layer. So use the value from
4100                                  * the IP layer.
4101                                  */
4102                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4103                         }
4104                         tos_value &= 0xfc;
4105                         if (ecn_ok) {
4106                                 tos_value |= sctp_get_ect(stcb);
4107                         }
4108                         if ((nofragment_flag) && (port == 0)) {
4109                                 ip->ip_off = htons(IP_DF);
4110                         } else {
4111                                 ip->ip_off = htons(0);
4112                         }
4113                         /* FreeBSD has a function for ip_id's */
4114                         ip->ip_id = ip_newid();
4115
4116                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4117                         ip->ip_len = htons(packet_length);
4118                         ip->ip_tos = tos_value;
4119                         if (port) {
4120                                 ip->ip_p = IPPROTO_UDP;
4121                         } else {
4122                                 ip->ip_p = IPPROTO_SCTP;
4123                         }
4124                         ip->ip_sum = 0;
4125                         if (net == NULL) {
4126                                 ro = &iproute;
4127                                 memset(&iproute, 0, sizeof(iproute));
4128                                 memcpy(&ro->ro_dst, to, to->sa_len);
4129                         } else {
4130                                 ro = (sctp_route_t *) & net->ro;
4131                         }
4132                         /* Now the address selection part */
4133                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4134
4135                         /* call the routine to select the src address */
4136                         if (net && out_of_asoc_ok == 0) {
4137                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4138                                         sctp_free_ifa(net->ro._s_addr);
4139                                         net->ro._s_addr = NULL;
4140                                         net->src_addr_selected = 0;
4141                                         if (ro->ro_rt) {
4142                                                 RTFREE(ro->ro_rt);
4143                                                 ro->ro_rt = NULL;
4144                                         }
4145                                 }
4146                                 if (net->src_addr_selected == 0) {
4147                                         /* Cache the source address */
4148                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4149                                             ro, net, 0,
4150                                             vrf_id);
4151                                         net->src_addr_selected = 1;
4152                                 }
4153                                 if (net->ro._s_addr == NULL) {
4154                                         /* No route to host */
4155                                         net->src_addr_selected = 0;
4156                                         sctp_handle_no_route(stcb, net, so_locked);
4157                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4158                                         sctp_m_freem(m);
4159                                         return (EHOSTUNREACH);
4160                                 }
4161                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4162                         } else {
4163                                 if (over_addr == NULL) {
4164                                         struct sctp_ifa *_lsrc;
4165
4166                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4167                                             net,
4168                                             out_of_asoc_ok,
4169                                             vrf_id);
4170                                         if (_lsrc == NULL) {
4171                                                 sctp_handle_no_route(stcb, net, so_locked);
4172                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4173                                                 sctp_m_freem(m);
4174                                                 return (EHOSTUNREACH);
4175                                         }
4176                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4177                                         sctp_free_ifa(_lsrc);
4178                                 } else {
4179                                         ip->ip_src = over_addr->sin.sin_addr;
4180                                         SCTP_RTALLOC(ro, vrf_id);
4181                                 }
4182                         }
4183                         if (port) {
4184                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
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                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4191                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4192                                 udp->uh_dport = port;
4193                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4194                                 if (V_udp_cksum) {
4195                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4196                                 } else {
4197                                         udp->uh_sum = 0;
4198                                 }
4199                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4200                         } else {
4201                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4202                         }
4203
4204                         sctphdr->src_port = src_port;
4205                         sctphdr->dest_port = dest_port;
4206                         sctphdr->v_tag = v_tag;
4207                         sctphdr->checksum = 0;
4208
4209                         /*
4210                          * If source address selection fails and we find no
4211                          * route then the ip_output should fail as well with
4212                          * a NO_ROUTE_TO_HOST type error. We probably should
4213                          * catch that somewhere and abort the association
4214                          * right away (assuming this is an INIT being sent).
4215                          */
4216                         if (ro->ro_rt == NULL) {
4217                                 /*
4218                                  * src addr selection failed to find a route
4219                                  * (or valid source addr), so we can't get
4220                                  * there from here (yet)!
4221                                  */
4222                                 sctp_handle_no_route(stcb, net, so_locked);
4223                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4224                                 sctp_m_freem(m);
4225                                 return (EHOSTUNREACH);
4226                         }
4227                         if (ro != &iproute) {
4228                                 memcpy(&iproute, ro, sizeof(*ro));
4229                         }
4230                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4231                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4232                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4233                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4234                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4235                             (void *)ro->ro_rt);
4236
4237                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4238                                 /* failed to prepend data, give up */
4239                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4240                                 sctp_m_freem(m);
4241                                 return (ENOMEM);
4242                         }
4243                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4244                         if (port) {
4245 #if defined(SCTP_WITH_NO_CSUM)
4246                                 SCTP_STAT_INCR(sctps_sendnocrc);
4247 #else
4248                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4249                                 SCTP_STAT_INCR(sctps_sendswcrc);
4250 #endif
4251                                 if (V_udp_cksum) {
4252                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4253                                 }
4254                         } else {
4255 #if defined(SCTP_WITH_NO_CSUM)
4256                                 SCTP_STAT_INCR(sctps_sendnocrc);
4257 #else
4258                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4259                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4260                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4261 #endif
4262                         }
4263 #ifdef SCTP_PACKET_LOGGING
4264                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4265                                 sctp_packet_log(o_pak);
4266 #endif
4267                         /* send it out.  table id is taken from stcb */
4268 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4269                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4270                                 so = SCTP_INP_SO(inp);
4271                                 SCTP_SOCKET_UNLOCK(so, 0);
4272                         }
4273 #endif
4274                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4275 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4276                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4277                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4278                                 SCTP_TCB_UNLOCK(stcb);
4279                                 SCTP_SOCKET_LOCK(so, 0);
4280                                 SCTP_TCB_LOCK(stcb);
4281                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4282                         }
4283 #endif
4284                         SCTP_STAT_INCR(sctps_sendpackets);
4285                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4286                         if (ret)
4287                                 SCTP_STAT_INCR(sctps_senderrors);
4288
4289                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4290                         if (net == NULL) {
4291                                 /* free tempy routes */
4292                                 RO_RTFREE(ro);
4293                         } else {
4294                                 /*
4295                                  * PMTU check versus smallest asoc MTU goes
4296                                  * here
4297                                  */
4298                                 if ((ro->ro_rt != NULL) &&
4299                                     (net->ro._s_addr)) {
4300                                         uint32_t mtu;
4301
4302                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4303                                         if (net->port) {
4304                                                 mtu -= sizeof(struct udphdr);
4305                                         }
4306                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4307                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4308                                                 net->mtu = mtu;
4309                                         }
4310                                 } else if (ro->ro_rt == NULL) {
4311                                         /* route was freed */
4312                                         if (net->ro._s_addr &&
4313                                             net->src_addr_selected) {
4314                                                 sctp_free_ifa(net->ro._s_addr);
4315                                                 net->ro._s_addr = NULL;
4316                                         }
4317                                         net->src_addr_selected = 0;
4318                                 }
4319                         }
4320                         return (ret);
4321                 }
4322 #endif
4323 #ifdef INET6
4324         case AF_INET6:
4325                 {
4326                         uint32_t flowlabel, flowinfo;
4327                         struct ip6_hdr *ip6h;
4328                         struct route_in6 ip6route;
4329                         struct ifnet *ifp;
4330                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4331                         int prev_scope = 0;
4332                         struct sockaddr_in6 lsa6_storage;
4333                         int error;
4334                         u_short prev_port = 0;
4335                         int len;
4336
4337                         if (net) {
4338                                 flowlabel = net->flowlabel;
4339                         } else if (stcb) {
4340                                 flowlabel = stcb->asoc.default_flowlabel;
4341                         } else {
4342                                 flowlabel = inp->sctp_ep.default_flowlabel;
4343                         }
4344                         if (flowlabel == 0) {
4345                                 /*
4346                                  * This means especially, that it is not set
4347                                  * at the SCTP layer. So use the value from
4348                                  * the IP layer.
4349                                  */
4350                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4351                         }
4352                         flowlabel &= 0x000fffff;
4353                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4354                         if (port) {
4355                                 len += sizeof(struct udphdr);
4356                         }
4357                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4358                         if (newm == NULL) {
4359                                 sctp_m_freem(m);
4360                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4361                                 return (ENOMEM);
4362                         }
4363                         SCTP_ALIGN_TO_END(newm, len);
4364                         SCTP_BUF_LEN(newm) = len;
4365                         SCTP_BUF_NEXT(newm) = m;
4366                         m = newm;
4367                         if (net != NULL) {
4368 #ifdef INVARIANTS
4369                                 if (net->flowidset == 0) {
4370                                         panic("Flow ID not set");
4371                                 }
4372 #endif
4373                                 m->m_pkthdr.flowid = net->flowid;
4374                                 m->m_flags |= M_FLOWID;
4375                         } else {
4376                                 if (use_mflowid != 0) {
4377                                         m->m_pkthdr.flowid = mflowid;
4378                                         m->m_flags |= M_FLOWID;
4379                                 }
4380                         }
4381                         packet_length = sctp_calculate_len(m);
4382
4383                         ip6h = mtod(m, struct ip6_hdr *);
4384                         /* protect *sin6 from overwrite */
4385                         sin6 = (struct sockaddr_in6 *)to;
4386                         tmp = *sin6;
4387                         sin6 = &tmp;
4388
4389                         /* KAME hack: embed scopeid */
4390                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4391                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4392                                 return (EINVAL);
4393                         }
4394                         if (net == NULL) {
4395                                 memset(&ip6route, 0, sizeof(ip6route));
4396                                 ro = (sctp_route_t *) & ip6route;
4397                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4398                         } else {
4399                                 ro = (sctp_route_t *) & net->ro;
4400                         }
4401                         /*
4402                          * We assume here that inp_flow is in host byte
4403                          * order within the TCB!
4404                          */
4405                         if (tos_value == 0) {
4406                                 /*
4407                                  * This means especially, that it is not set
4408                                  * at the SCTP layer. So use the value from
4409                                  * the IP layer.
4410                                  */
4411                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4412                         }
4413                         tos_value &= 0xfc;
4414                         if (ecn_ok) {
4415                                 tos_value |= sctp_get_ect(stcb);
4416                         }
4417                         flowinfo = 0x06;
4418                         flowinfo <<= 8;
4419                         flowinfo |= tos_value;
4420                         flowinfo <<= 20;
4421                         flowinfo |= flowlabel;
4422                         ip6h->ip6_flow = htonl(flowinfo);
4423                         if (port) {
4424                                 ip6h->ip6_nxt = IPPROTO_UDP;
4425                         } else {
4426                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4427                         }
4428                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4429                         ip6h->ip6_dst = sin6->sin6_addr;
4430
4431                         /*
4432                          * Add SRC address selection here: we can only reuse
4433                          * to a limited degree the kame src-addr-sel, since
4434                          * we can try their selection but it may not be
4435                          * bound.
4436                          */
4437                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4438                         lsa6_tmp.sin6_family = AF_INET6;
4439                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4440                         lsa6 = &lsa6_tmp;
4441                         if (net && out_of_asoc_ok == 0) {
4442                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4443                                         sctp_free_ifa(net->ro._s_addr);
4444                                         net->ro._s_addr = NULL;
4445                                         net->src_addr_selected = 0;
4446                                         if (ro->ro_rt) {
4447                                                 RTFREE(ro->ro_rt);
4448                                                 ro->ro_rt = NULL;
4449                                         }
4450                                 }
4451                                 if (net->src_addr_selected == 0) {
4452                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4453                                         /* KAME hack: embed scopeid */
4454                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4455                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4456                                                 return (EINVAL);
4457                                         }
4458                                         /* Cache the source address */
4459                                         net->ro._s_addr = sctp_source_address_selection(inp,
4460                                             stcb,
4461                                             ro,
4462                                             net,
4463                                             0,
4464                                             vrf_id);
4465                                         (void)sa6_recoverscope(sin6);
4466                                         net->src_addr_selected = 1;
4467                                 }
4468                                 if (net->ro._s_addr == NULL) {
4469                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4470                                         net->src_addr_selected = 0;
4471                                         sctp_handle_no_route(stcb, net, so_locked);
4472                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4473                                         sctp_m_freem(m);
4474                                         return (EHOSTUNREACH);
4475                                 }
4476                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4477                         } else {
4478                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4479                                 /* KAME hack: embed scopeid */
4480                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4481                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4482                                         return (EINVAL);
4483                                 }
4484                                 if (over_addr == NULL) {
4485                                         struct sctp_ifa *_lsrc;
4486
4487                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4488                                             net,
4489                                             out_of_asoc_ok,
4490                                             vrf_id);
4491                                         if (_lsrc == NULL) {
4492                                                 sctp_handle_no_route(stcb, net, so_locked);
4493                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4494                                                 sctp_m_freem(m);
4495                                                 return (EHOSTUNREACH);
4496                                         }
4497                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4498                                         sctp_free_ifa(_lsrc);
4499                                 } else {
4500                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4501                                         SCTP_RTALLOC(ro, vrf_id);
4502                                 }
4503                                 (void)sa6_recoverscope(sin6);
4504                         }
4505                         lsa6->sin6_port = inp->sctp_lport;
4506
4507                         if (ro->ro_rt == NULL) {
4508                                 /*
4509                                  * src addr selection failed to find a route
4510                                  * (or valid source addr), so we can't get
4511                                  * there from here!
4512                                  */
4513                                 sctp_handle_no_route(stcb, net, so_locked);
4514                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4515                                 sctp_m_freem(m);
4516                                 return (EHOSTUNREACH);
4517                         }
4518                         /*
4519                          * XXX: sa6 may not have a valid sin6_scope_id in
4520                          * the non-SCOPEDROUTING case.
4521                          */
4522                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4523                         lsa6_storage.sin6_family = AF_INET6;
4524                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4525                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4526                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4527                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4528                                 sctp_m_freem(m);
4529                                 return (error);
4530                         }
4531                         /* XXX */
4532                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4533                         lsa6_storage.sin6_port = inp->sctp_lport;
4534                         lsa6 = &lsa6_storage;
4535                         ip6h->ip6_src = lsa6->sin6_addr;
4536
4537                         if (port) {
4538                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4539                                         sctp_handle_no_route(stcb, net, so_locked);
4540                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4541                                         sctp_m_freem(m);
4542                                         return (EHOSTUNREACH);
4543                                 }
4544                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4545                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4546                                 udp->uh_dport = port;
4547                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4548                                 udp->uh_sum = 0;
4549                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4550                         } else {
4551                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4552                         }
4553
4554                         sctphdr->src_port = src_port;
4555                         sctphdr->dest_port = dest_port;
4556                         sctphdr->v_tag = v_tag;
4557                         sctphdr->checksum = 0;
4558
4559                         /*
4560                          * We set the hop limit now since there is a good
4561                          * chance that our ro pointer is now filled
4562                          */
4563                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4564                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4565
4566 #ifdef SCTP_DEBUG
4567                         /* Copy to be sure something bad is not happening */
4568                         sin6->sin6_addr = ip6h->ip6_dst;
4569                         lsa6->sin6_addr = ip6h->ip6_src;
4570 #endif
4571
4572                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4573                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4574                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4575                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4576                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4577                         if (net) {
4578                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4579                                 /*
4580                                  * preserve the port and scope for link
4581                                  * local send
4582                                  */
4583                                 prev_scope = sin6->sin6_scope_id;
4584                                 prev_port = sin6->sin6_port;
4585                         }
4586                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4587                                 /* failed to prepend data, give up */
4588                                 sctp_m_freem(m);
4589                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4590                                 return (ENOMEM);
4591                         }
4592                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4593                         if (port) {
4594 #if defined(SCTP_WITH_NO_CSUM)
4595                                 SCTP_STAT_INCR(sctps_sendnocrc);
4596 #else
4597                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4598                                 SCTP_STAT_INCR(sctps_sendswcrc);
4599 #endif
4600                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4601                                         udp->uh_sum = 0xffff;
4602                                 }
4603                         } else {
4604 #if defined(SCTP_WITH_NO_CSUM)
4605                                 SCTP_STAT_INCR(sctps_sendnocrc);
4606 #else
4607                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4608                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4609                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4610 #endif
4611                         }
4612                         /* send it out. table id is taken from stcb */
4613 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4614                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4615                                 so = SCTP_INP_SO(inp);
4616                                 SCTP_SOCKET_UNLOCK(so, 0);
4617                         }
4618 #endif
4619 #ifdef SCTP_PACKET_LOGGING
4620                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4621                                 sctp_packet_log(o_pak);
4622 #endif
4623                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4624 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4625                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4626                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4627                                 SCTP_TCB_UNLOCK(stcb);
4628                                 SCTP_SOCKET_LOCK(so, 0);
4629                                 SCTP_TCB_LOCK(stcb);
4630                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4631                         }
4632 #endif
4633                         if (net) {
4634                                 /* for link local this must be done */
4635                                 sin6->sin6_scope_id = prev_scope;
4636                                 sin6->sin6_port = prev_port;
4637                         }
4638                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4639                         SCTP_STAT_INCR(sctps_sendpackets);
4640                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4641                         if (ret) {
4642                                 SCTP_STAT_INCR(sctps_senderrors);
4643                         }
4644                         if (net == NULL) {
4645                                 /* Now if we had a temp route free it */
4646                                 RO_RTFREE(ro);
4647                         } else {
4648                                 /*
4649                                  * PMTU check versus smallest asoc MTU goes
4650                                  * here
4651                                  */
4652                                 if (ro->ro_rt == NULL) {
4653                                         /* Route was freed */
4654                                         if (net->ro._s_addr &&
4655                                             net->src_addr_selected) {
4656                                                 sctp_free_ifa(net->ro._s_addr);
4657                                                 net->ro._s_addr = NULL;
4658                                         }
4659                                         net->src_addr_selected = 0;
4660                                 }
4661                                 if ((ro->ro_rt != NULL) &&
4662                                     (net->ro._s_addr)) {
4663                                         uint32_t mtu;
4664
4665                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4666                                         if (mtu &&
4667                                             (stcb->asoc.smallest_mtu > mtu)) {
4668                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4669                                                 net->mtu = mtu;
4670                                                 if (net->port) {
4671                                                         net->mtu -= sizeof(struct udphdr);
4672                                                 }
4673                                         }
4674                                 } else if (ifp) {
4675                                         if (ND_IFINFO(ifp)->linkmtu &&
4676                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4677                                                 sctp_mtu_size_reset(inp,
4678                                                     &stcb->asoc,
4679                                                     ND_IFINFO(ifp)->linkmtu);
4680                                         }
4681                                 }
4682                         }
4683                         return (ret);
4684                 }
4685 #endif
4686         default:
4687                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4688                     ((struct sockaddr *)to)->sa_family);
4689                 sctp_m_freem(m);
4690                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4691                 return (EFAULT);
4692         }
4693 }
4694
4695
4696 void
4697 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4698 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4699     SCTP_UNUSED
4700 #endif
4701 )
4702 {
4703         struct mbuf *m, *m_last;
4704         struct sctp_nets *net;
4705         struct sctp_init_chunk *init;
4706         struct sctp_supported_addr_param *sup_addr;
4707         struct sctp_adaptation_layer_indication *ali;
4708         struct sctp_supported_chunk_types_param *pr_supported;
4709         struct sctp_paramhdr *ph;
4710         int cnt_inits_to = 0;
4711         int ret;
4712         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4713
4714         /* INIT's always go to the primary (and usually ONLY address) */
4715         net = stcb->asoc.primary_destination;
4716         if (net == NULL) {
4717                 net = TAILQ_FIRST(&stcb->asoc.nets);
4718                 if (net == NULL) {
4719                         /* TSNH */
4720                         return;
4721                 }
4722                 /* we confirm any address we send an INIT to */
4723                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4724                 (void)sctp_set_primary_addr(stcb, NULL, net);
4725         } else {
4726                 /* we confirm any address we send an INIT to */
4727                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4728         }
4729         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4730 #ifdef INET6
4731         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4732                 /*
4733                  * special hook, if we are sending to link local it will not
4734                  * show up in our private address count.
4735                  */
4736                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4737                         cnt_inits_to = 1;
4738         }
4739 #endif
4740         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4741                 /* This case should not happen */
4742                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4743                 return;
4744         }
4745         /* start the INIT timer */
4746         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4747
4748         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4749         if (m == NULL) {
4750                 /* No memory, INIT timer will re-attempt. */
4751                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4752                 return;
4753         }
4754         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4755         padding_len = 0;
4756         /*
4757          * assume peer supports asconf in order to be able to queue local
4758          * address changes while an INIT is in flight and before the assoc
4759          * is established.
4760          */
4761         stcb->asoc.peer_supports_asconf = 1;
4762         /* Now lets put the chunk header in place */
4763         init = mtod(m, struct sctp_init_chunk *);
4764         /* now the chunk header */
4765         init->ch.chunk_type = SCTP_INITIATION;
4766         init->ch.chunk_flags = 0;
4767         /* fill in later from mbuf we build */
4768         init->ch.chunk_length = 0;
4769         /* place in my tag */
4770         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4771         /* set up some of the credits. */
4772         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4773             SCTP_MINIMAL_RWND));
4774         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4775         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4776         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4777
4778         /* Adaptation layer indication parameter */
4779         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4780                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4781                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4782                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4783                 ali->ph.param_length = htons(parameter_len);
4784                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4785                 chunk_len += parameter_len;
4786         }
4787         /* ECN parameter */
4788         if (stcb->asoc.ecn_allowed == 1) {
4789                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4790                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4791                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4792                 ph->param_length = htons(parameter_len);
4793                 chunk_len += parameter_len;
4794         }
4795         /* And now tell the peer we do support PR-SCTP. */
4796         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4797         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4798         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4799         ph->param_length = htons(parameter_len);
4800         chunk_len += parameter_len;
4801
4802         /* Add NAT friendly parameter. */
4803         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4804                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4805                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4806                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4807                 ph->param_length = htons(parameter_len);
4808                 chunk_len += parameter_len;
4809         }
4810         /* And now tell the peer which extensions we support */
4811         num_ext = 0;
4812         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4813         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4814         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4815         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4816         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4817         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4818         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4819         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4820                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4821         }
4822         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4823                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4824         }
4825         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4826         pr_supported->ph.param_length = htons(parameter_len);
4827         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4828         chunk_len += parameter_len;
4829
4830         /* add authentication parameters */
4831         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4832                 /* attach RANDOM parameter, if available */
4833                 if (stcb->asoc.authinfo.random != NULL) {
4834                         struct sctp_auth_random *randp;
4835
4836                         if (padding_len > 0) {
4837                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4838                                 chunk_len += padding_len;
4839                                 padding_len = 0;
4840                         }
4841                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4842                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4843                         /* random key already contains the header */
4844                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4845                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4846                         chunk_len += parameter_len;
4847                 }
4848                 /* add HMAC_ALGO parameter */
4849                 if ((stcb->asoc.local_hmacs != NULL) &&
4850                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4851                         struct sctp_auth_hmac_algo *hmacs;
4852
4853                         if (padding_len > 0) {
4854                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4855                                 chunk_len += padding_len;
4856                                 padding_len = 0;
4857                         }
4858                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4859                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4860                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4861                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4862                         hmacs->ph.param_length = htons(parameter_len);
4863                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4864                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4865                         chunk_len += parameter_len;
4866                 }
4867                 /* add CHUNKS parameter */
4868                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4869                         struct sctp_auth_chunk_list *chunks;
4870
4871                         if (padding_len > 0) {
4872                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4873                                 chunk_len += padding_len;
4874                                 padding_len = 0;
4875                         }
4876                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4877                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4878                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4879                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4880                         chunks->ph.param_length = htons(parameter_len);
4881                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4882                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4883                         chunk_len += parameter_len;
4884                 }
4885         }
4886         /* now any cookie time extensions */
4887         if (stcb->asoc.cookie_preserve_req) {
4888                 struct sctp_cookie_perserve_param *cookie_preserve;
4889
4890                 if (padding_len > 0) {
4891                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4892                         chunk_len += padding_len;
4893                         padding_len = 0;
4894                 }
4895                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4896                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4897                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4898                 cookie_preserve->ph.param_length = htons(parameter_len);
4899                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4900                 stcb->asoc.cookie_preserve_req = 0;
4901                 chunk_len += parameter_len;
4902         }
4903         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4904                 uint8_t i;
4905
4906                 if (padding_len > 0) {
4907                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4908                         chunk_len += padding_len;
4909                         padding_len = 0;
4910                 }
4911                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4912                 if (stcb->asoc.scope.ipv4_addr_legal) {
4913                         parameter_len += (uint16_t) sizeof(uint16_t);
4914                 }
4915                 if (stcb->asoc.scope.ipv6_addr_legal) {
4916                         parameter_len += (uint16_t) sizeof(uint16_t);
4917                 }
4918                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4919                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4920                 sup_addr->ph.param_length = htons(parameter_len);
4921                 i = 0;
4922                 if (stcb->asoc.scope.ipv4_addr_legal) {
4923                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4924                 }
4925                 if (stcb->asoc.scope.ipv6_addr_legal) {
4926                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4927                 }
4928                 padding_len = 4 - 2 * i;
4929                 chunk_len += parameter_len;
4930         }
4931         SCTP_BUF_LEN(m) = chunk_len;
4932         /* now the addresses */
4933         /*
4934          * To optimize this we could put the scoping stuff into a structure
4935          * and remove the individual uint8's from the assoc structure. Then
4936          * we could just sifa in the address within the stcb. But for now
4937          * this is a quick hack to get the address stuff teased apart.
4938          */
4939         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4940             m, cnt_inits_to,
4941             &padding_len, &chunk_len);
4942
4943         init->ch.chunk_length = htons(chunk_len);
4944         if (padding_len > 0) {
4945                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4946                         sctp_m_freem(m);
4947                         return;
4948                 }
4949         }
4950         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4951         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4952             (struct sockaddr *)&net->ro._l_addr,
4953             m, 0, NULL, 0, 0, 0, 0,
4954             inp->sctp_lport, stcb->rport, htonl(0),
4955             net->port, NULL,
4956             0, 0,
4957             so_locked);
4958         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4959         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4960         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4961 }
4962
4963 struct mbuf *
4964 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4965     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4966 {
4967         /*
4968          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4969          * being equal to the beginning of the params i.e. (iphlen +
4970          * sizeof(struct sctp_init_msg) parse through the parameters to the
4971          * end of the mbuf verifying that all parameters are known.
4972          *
4973          * For unknown parameters build and return a mbuf with
4974          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4975          * processing this chunk stop, and set *abort_processing to 1.
4976          *
4977          * By having param_offset be pre-set to where parameters begin it is
4978          * hoped that this routine may be reused in the future by new
4979          * features.
4980          */
4981         struct sctp_paramhdr *phdr, params;
4982
4983         struct mbuf *mat, *op_err;
4984         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4985         int at, limit, pad_needed;
4986         uint16_t ptype, plen, padded_size;
4987         int err_at;
4988
4989         *abort_processing = 0;
4990         mat = in_initpkt;
4991         err_at = 0;
4992         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4993         at = param_offset;
4994         op_err = NULL;
4995         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4996         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4997         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4998                 ptype = ntohs(phdr->param_type);
4999                 plen = ntohs(phdr->param_length);
5000                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5001                         /* wacked parameter */
5002                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5003                         goto invalid_size;
5004                 }
5005                 limit -= SCTP_SIZE32(plen);
5006                 /*-
5007                  * All parameters for all chunks that we know/understand are
5008                  * listed here. We process them other places and make
5009                  * appropriate stop actions per the upper bits. However this
5010                  * is the generic routine processor's can call to get back
5011                  * an operr.. to either incorporate (init-ack) or send.
5012                  */
5013                 padded_size = SCTP_SIZE32(plen);
5014                 switch (ptype) {
5015                         /* Param's with variable size */
5016                 case SCTP_HEARTBEAT_INFO:
5017                 case SCTP_STATE_COOKIE:
5018                 case SCTP_UNRECOG_PARAM:
5019                 case SCTP_ERROR_CAUSE_IND:
5020                         /* ok skip fwd */
5021                         at += padded_size;
5022                         break;
5023                         /* Param's with variable size within a range */
5024                 case SCTP_CHUNK_LIST:
5025                 case SCTP_SUPPORTED_CHUNK_EXT:
5026                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5028                                 goto invalid_size;
5029                         }
5030                         at += padded_size;
5031                         break;
5032                 case SCTP_SUPPORTED_ADDRTYPE:
5033                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5034                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5035                                 goto invalid_size;
5036                         }
5037                         at += padded_size;
5038                         break;
5039                 case SCTP_RANDOM:
5040                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                 case SCTP_SET_PRIM_ADDR:
5047                 case SCTP_DEL_IP_ADDRESS:
5048                 case SCTP_ADD_IP_ADDRESS:
5049                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5050                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5052                                 goto invalid_size;
5053                         }
5054                         at += padded_size;
5055                         break;
5056                         /* Param's with a fixed size */
5057                 case SCTP_IPV4_ADDRESS:
5058                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_IPV6_ADDRESS:
5065                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5066                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5067                                 goto invalid_size;
5068                         }
5069                         at += padded_size;
5070                         break;
5071                 case SCTP_COOKIE_PRESERVE:
5072                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5073                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5074                                 goto invalid_size;
5075                         }
5076                         at += padded_size;
5077                         break;
5078                 case SCTP_HAS_NAT_SUPPORT:
5079                         *nat_friendly = 1;
5080                         /* fall through */
5081                 case SCTP_PRSCTP_SUPPORTED:
5082                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5084                                 goto invalid_size;
5085                         }
5086                         at += padded_size;
5087                         break;
5088                 case SCTP_ECN_CAPABLE:
5089                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_ULP_ADAPTATION:
5096                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5097                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5098                                 goto invalid_size;
5099                         }
5100                         at += padded_size;
5101                         break;
5102                 case SCTP_SUCCESS_REPORT:
5103                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5104                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5105                                 goto invalid_size;
5106                         }
5107                         at += padded_size;
5108                         break;
5109                 case SCTP_HOSTNAME_ADDRESS:
5110                         {
5111                                 /* We can NOT handle HOST NAME addresses!! */
5112                                 int l_len;
5113
5114                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5115                                 *abort_processing = 1;
5116                                 if (op_err == NULL) {
5117                                         /* Ok need to try to get a mbuf */
5118 #ifdef INET6
5119                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5120 #else
5121                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5122 #endif
5123                                         l_len += plen;
5124                                         l_len += sizeof(struct sctp_paramhdr);
5125                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5126                                         if (op_err) {
5127                                                 SCTP_BUF_LEN(op_err) = 0;
5128                                                 /*
5129                                                  * pre-reserve space for ip
5130                                                  * and sctp header  and
5131                                                  * chunk hdr
5132                                                  */
5133 #ifdef INET6
5134                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5135 #else
5136                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5137 #endif
5138                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5139                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5140                                         }
5141                                 }
5142                                 if (op_err) {
5143                                         /* If we have space */
5144                                         struct sctp_paramhdr s;
5145
5146                                         if (err_at % 4) {
5147                                                 uint32_t cpthis = 0;
5148
5149                                                 pad_needed = 4 - (err_at % 4);
5150                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5151                                                 err_at += pad_needed;
5152                                         }
5153                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5154                                         s.param_length = htons(sizeof(s) + plen);
5155                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5156                                         err_at += sizeof(s);
5157                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5158                                         if (phdr == NULL) {
5159                                                 sctp_m_freem(op_err);
5160                                                 /*
5161                                                  * we are out of memory but
5162                                                  * we still need to have a
5163                                                  * look at what to do (the
5164                                                  * system is in trouble
5165                                                  * though).
5166                                                  */
5167                                                 return (NULL);
5168                                         }
5169                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5170                                 }
5171                                 return (op_err);
5172                                 break;
5173                         }
5174                 default:
5175                         /*
5176                          * we do not recognize the parameter figure out what
5177                          * we do.
5178                          */
5179                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5180                         if ((ptype & 0x4000) == 0x4000) {
5181                                 /* Report bit is set?? */
5182                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5183                                 if (op_err == NULL) {
5184                                         int l_len;
5185
5186                                         /* Ok need to try to get an mbuf */
5187 #ifdef INET6
5188                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5189 #else
5190                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5191 #endif
5192                                         l_len += plen;
5193                                         l_len += sizeof(struct sctp_paramhdr);
5194                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5195                                         if (op_err) {
5196                                                 SCTP_BUF_LEN(op_err) = 0;
5197 #ifdef INET6
5198                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5199 #else
5200                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5201 #endif
5202                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5203                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5204                                         }
5205                                 }
5206                                 if (op_err) {
5207                                         /* If we have space */
5208                                         struct sctp_paramhdr s;
5209
5210                                         if (err_at % 4) {
5211                                                 uint32_t cpthis = 0;
5212
5213                                                 pad_needed = 4 - (err_at % 4);
5214                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5215                                                 err_at += pad_needed;
5216                                         }
5217                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5218                                         s.param_length = htons(sizeof(s) + plen);
5219                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5220                                         err_at += sizeof(s);
5221                                         if (plen > sizeof(tempbuf)) {
5222                                                 plen = sizeof(tempbuf);
5223                                         }
5224                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5225                                         if (phdr == NULL) {
5226                                                 sctp_m_freem(op_err);
5227                                                 /*
5228                                                  * we are out of memory but
5229                                                  * we still need to have a
5230                                                  * look at what to do (the
5231                                                  * system is in trouble
5232                                                  * though).
5233                                                  */
5234                                                 op_err = NULL;
5235                                                 goto more_processing;
5236                                         }
5237                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5238                                         err_at += plen;
5239                                 }
5240                         }
5241         more_processing:
5242                         if ((ptype & 0x8000) == 0x0000) {
5243                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5244                                 return (op_err);
5245                         } else {
5246                                 /* skip this chunk and continue processing */
5247                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5248                                 at += SCTP_SIZE32(plen);
5249                         }
5250                         break;
5251
5252                 }
5253                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5254         }
5255         return (op_err);
5256 invalid_size:
5257         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5258         *abort_processing = 1;
5259         if ((op_err == NULL) && phdr) {
5260                 int l_len;
5261
5262 #ifdef INET6
5263                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5264 #else
5265                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5266 #endif
5267                 l_len += (2 * sizeof(struct sctp_paramhdr));
5268                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5269                 if (op_err) {
5270                         SCTP_BUF_LEN(op_err) = 0;
5271 #ifdef INET6
5272                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5273 #else
5274                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5275 #endif
5276                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5277                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5278                 }
5279         }
5280         if ((op_err) && phdr) {
5281                 struct sctp_paramhdr s;
5282
5283                 if (err_at % 4) {
5284                         uint32_t cpthis = 0;
5285
5286                         pad_needed = 4 - (err_at % 4);
5287                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5288                         err_at += pad_needed;
5289                 }
5290                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5291                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5292                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5293                 err_at += sizeof(s);
5294                 /* Only copy back the p-hdr that caused the issue */
5295                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5296         }
5297         return (op_err);
5298 }
5299
5300 static int
5301 sctp_are_there_new_addresses(struct sctp_association *asoc,
5302     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5303 {
5304         /*
5305          * Given a INIT packet, look through the packet to verify that there
5306          * are NO new addresses. As we go through the parameters add reports
5307          * of any un-understood parameters that require an error.  Also we
5308          * must return (1) to drop the packet if we see a un-understood
5309          * parameter that tells us to drop the chunk.
5310          */
5311         struct sockaddr *sa_touse;
5312         struct sockaddr *sa;
5313         struct sctp_paramhdr *phdr, params;
5314         uint16_t ptype, plen;
5315         uint8_t fnd;
5316         struct sctp_nets *net;
5317
5318 #ifdef INET
5319         struct sockaddr_in sin4, *sa4;
5320
5321 #endif
5322 #ifdef INET6
5323         struct sockaddr_in6 sin6, *sa6;
5324
5325 #endif
5326
5327 #ifdef INET
5328         memset(&sin4, 0, sizeof(sin4));
5329         sin4.sin_family = AF_INET;
5330         sin4.sin_len = sizeof(sin4);
5331 #endif
5332 #ifdef INET6
5333         memset(&sin6, 0, sizeof(sin6));
5334         sin6.sin6_family = AF_INET6;
5335         sin6.sin6_len = sizeof(sin6);
5336 #endif
5337         /* First what about the src address of the pkt ? */
5338         fnd = 0;
5339         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5340                 sa = (struct sockaddr *)&net->ro._l_addr;
5341                 if (sa->sa_family == src->sa_family) {
5342 #ifdef INET
5343                         if (sa->sa_family == AF_INET) {
5344                                 struct sockaddr_in *src4;
5345
5346                                 sa4 = (struct sockaddr_in *)sa;
5347                                 src4 = (struct sockaddr_in *)src;
5348                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5349                                         fnd = 1;
5350                                         break;
5351                                 }
5352                         }
5353 #endif
5354 #ifdef INET6
5355                         if (sa->sa_family == AF_INET6) {
5356                                 struct sockaddr_in6 *src6;
5357
5358                                 sa6 = (struct sockaddr_in6 *)sa;
5359                                 src6 = (struct sockaddr_in6 *)src;
5360                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5361                                         fnd = 1;
5362                                         break;
5363                                 }
5364                         }
5365 #endif
5366                 }
5367         }
5368         if (fnd == 0) {
5369                 /* New address added! no need to look futher. */
5370                 return (1);
5371         }
5372         /* Ok so far lets munge through the rest of the packet */
5373         offset += sizeof(struct sctp_init_chunk);
5374         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5375         while (phdr) {
5376                 sa_touse = NULL;
5377                 ptype = ntohs(phdr->param_type);
5378                 plen = ntohs(phdr->param_length);
5379                 switch (ptype) {
5380 #ifdef INET
5381                 case SCTP_IPV4_ADDRESS:
5382                         {
5383                                 struct sctp_ipv4addr_param *p4, p4_buf;
5384
5385                                 phdr = sctp_get_next_param(in_initpkt, offset,
5386                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5387                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5388                                     phdr == NULL) {
5389                                         return (1);
5390                                 }
5391                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5392                                 sin4.sin_addr.s_addr = p4->addr;
5393                                 sa_touse = (struct sockaddr *)&sin4;
5394                                 break;
5395                         }
5396 #endif
5397 #ifdef INET6
5398                 case SCTP_IPV6_ADDRESS:
5399                         {
5400                                 struct sctp_ipv6addr_param *p6, p6_buf;
5401
5402                                 phdr = sctp_get_next_param(in_initpkt, offset,
5403                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5404                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5405                                     phdr == NULL) {
5406                                         return (1);
5407                                 }
5408                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5409                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5410                                     sizeof(p6->addr));
5411                                 sa_touse = (struct sockaddr *)&sin6;
5412                                 break;
5413                         }
5414 #endif
5415                 default:
5416                         sa_touse = NULL;
5417                         break;
5418                 }
5419                 if (sa_touse) {
5420                         /* ok, sa_touse points to one to check */
5421                         fnd = 0;
5422                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5423                                 sa = (struct sockaddr *)&net->ro._l_addr;
5424                                 if (sa->sa_family != sa_touse->sa_family) {
5425                                         continue;
5426                                 }
5427 #ifdef INET
5428                                 if (sa->sa_family == AF_INET) {
5429                                         sa4 = (struct sockaddr_in *)sa;
5430                                         if (sa4->sin_addr.s_addr ==
5431                                             sin4.sin_addr.s_addr) {
5432                                                 fnd = 1;
5433                                                 break;
5434                                         }
5435                                 }
5436 #endif
5437 #ifdef INET6
5438                                 if (sa->sa_family == AF_INET6) {
5439                                         sa6 = (struct sockaddr_in6 *)sa;
5440                                         if (SCTP6_ARE_ADDR_EQUAL(
5441                                             sa6, &sin6)) {
5442                                                 fnd = 1;
5443                                                 break;
5444                                         }
5445                                 }
5446 #endif
5447                         }
5448                         if (!fnd) {
5449                                 /* New addr added! no need to look further */
5450                                 return (1);
5451                         }
5452                 }
5453                 offset += SCTP_SIZE32(plen);
5454                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5455         }
5456         return (0);
5457 }
5458
5459 /*
5460  * Given a MBUF chain that was sent into us containing an INIT. Build a
5461  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5462  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5463  * message (i.e. the struct sctp_init_msg).
5464  */
5465 void
5466 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5467     struct mbuf *init_pkt, int iphlen, int offset,
5468     struct sockaddr *src, struct sockaddr *dst,
5469     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5470     uint8_t use_mflowid, uint32_t mflowid,
5471     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5472 {
5473         struct sctp_association *asoc;
5474         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5475         struct sctp_init_ack_chunk *initack;
5476         struct sctp_adaptation_layer_indication *ali;
5477         struct sctp_supported_chunk_types_param *pr_supported;
5478         struct sctp_paramhdr *ph;
5479         union sctp_sockstore *over_addr;
5480         struct sctp_scoping scp;
5481
5482 #ifdef INET
5483         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5484         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5485         struct sockaddr_in *sin;
5486
5487 #endif
5488 #ifdef INET6
5489         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5490         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5491         struct sockaddr_in6 *sin6;
5492
5493 #endif
5494         struct sockaddr *to;
5495         struct sctp_state_cookie stc;
5496         struct sctp_nets *net = NULL;
5497         uint8_t *signature = NULL;
5498         int cnt_inits_to = 0;
5499         uint16_t his_limit, i_want;
5500         int abort_flag;
5501         int nat_friendly = 0;
5502         struct socket *so;
5503         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5504
5505         if (stcb) {
5506                 asoc = &stcb->asoc;
5507         } else {
5508                 asoc = NULL;
5509         }
5510         if ((asoc != NULL) &&
5511             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5512             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5513                 /* new addresses, out of here in non-cookie-wait states */
5514                 /*
5515                  * Send a ABORT, we don't add the new address error clause
5516                  * though we even set the T bit and copy in the 0 tag.. this
5517                  * looks no different than if no listener was present.
5518                  */
5519                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5520                     "Address added");
5521                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5522                     use_mflowid, mflowid,
5523                     vrf_id, port);
5524                 return;
5525         }
5526         abort_flag = 0;
5527         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5528             (offset + sizeof(struct sctp_init_chunk)),
5529             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5530         if (abort_flag) {
5531 do_a_abort:
5532                 if (op_err == NULL) {
5533                         char msg[SCTP_DIAG_INFO_LEN];
5534
5535                         snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5536                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5537                             msg);
5538                 }
5539                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5540                     init_chk->init.initiate_tag, op_err,
5541                     use_mflowid, mflowid,
5542                     vrf_id, port);
5543                 return;
5544         }
5545         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5546         if (m == NULL) {
5547                 /* No memory, INIT timer will re-attempt. */
5548                 if (op_err)
5549                         sctp_m_freem(op_err);
5550                 return;
5551         }
5552         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5553         padding_len = 0;
5554
5555         /*
5556          * We might not overwrite the identification[] completely and on
5557          * some platforms time_entered will contain some padding. Therefore
5558          * zero out the cookie to avoid putting uninitialized memory on the
5559          * wire.
5560          */
5561         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5562
5563         /* the time I built cookie */
5564         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5565
5566         /* populate any tie tags */
5567         if (asoc != NULL) {
5568                 /* unlock before tag selections */
5569                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5570                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5571                 stc.cookie_life = asoc->cookie_life;
5572                 net = asoc->primary_destination;
5573         } else {
5574                 stc.tie_tag_my_vtag = 0;
5575                 stc.tie_tag_peer_vtag = 0;
5576                 /* life I will award this cookie */
5577                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5578         }
5579
5580         /* copy in the ports for later check */
5581         stc.myport = sh->dest_port;
5582         stc.peerport = sh->src_port;
5583
5584         /*
5585          * If we wanted to honor cookie life extentions, we would add to
5586          * stc.cookie_life. For now we should NOT honor any extension
5587          */
5588         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5589         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5590                 stc.ipv6_addr_legal = 1;
5591                 if (SCTP_IPV6_V6ONLY(inp)) {
5592                         stc.ipv4_addr_legal = 0;
5593                 } else {
5594                         stc.ipv4_addr_legal = 1;
5595                 }
5596         } else {
5597                 stc.ipv6_addr_legal = 0;
5598                 stc.ipv4_addr_legal = 1;
5599         }
5600 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5601         stc.ipv4_scope = 1;
5602 #else
5603         stc.ipv4_scope = 0;
5604 #endif
5605         if (net == NULL) {
5606                 to = src;
5607                 switch (dst->sa_family) {
5608 #ifdef INET
5609                 case AF_INET:
5610                         {
5611                                 /* lookup address */
5612                                 stc.address[0] = src4->sin_addr.s_addr;
5613                                 stc.address[1] = 0;
5614                                 stc.address[2] = 0;
5615                                 stc.address[3] = 0;
5616                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5617                                 /* local from address */
5618                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5619                                 stc.laddress[1] = 0;
5620                                 stc.laddress[2] = 0;
5621                                 stc.laddress[3] = 0;
5622                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5623                                 /* scope_id is only for v6 */
5624                                 stc.scope_id = 0;
5625 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5626                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5627                                         stc.ipv4_scope = 1;
5628                                 }
5629 #else
5630                                 stc.ipv4_scope = 1;
5631 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5632                                 /* Must use the address in this case */
5633                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5634                                         stc.loopback_scope = 1;
5635                                         stc.ipv4_scope = 1;
5636                                         stc.site_scope = 1;
5637                                         stc.local_scope = 0;
5638                                 }
5639                                 break;
5640                         }
5641 #endif
5642 #ifdef INET6
5643                 case AF_INET6:
5644                         {
5645                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5646                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5647                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5648                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5649                                         stc.loopback_scope = 1;
5650                                         stc.local_scope = 0;
5651                                         stc.site_scope = 1;
5652                                         stc.ipv4_scope = 1;
5653                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5654                                         /*
5655                                          * If the new destination is a
5656                                          * LINK_LOCAL we must have common
5657                                          * both site and local scope. Don't
5658                                          * set local scope though since we
5659                                          * must depend on the source to be
5660                                          * added implicitly. We cannot
5661                                          * assure just because we share one
5662                                          * link that all links are common.
5663                                          */
5664                                         stc.local_scope = 0;
5665                                         stc.site_scope = 1;
5666                                         stc.ipv4_scope = 1;
5667                                         /*
5668                                          * we start counting for the private
5669                                          * address stuff at 1. since the
5670                                          * link local we source from won't
5671                                          * show up in our scoped count.
5672                                          */
5673                                         cnt_inits_to = 1;
5674                                         /*
5675                                          * pull out the scope_id from
5676                                          * incoming pkt
5677                                          */
5678                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5679                                         /*
5680                                          * If the new destination is
5681                                          * SITE_LOCAL then we must have site
5682                                          * scope in common.
5683                                          */
5684                                         stc.site_scope = 1;
5685                                 }
5686                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5687                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5688                                 break;
5689                         }
5690 #endif
5691                 default:
5692                         /* TSNH */
5693                         goto do_a_abort;
5694                         break;
5695                 }
5696         } else {
5697                 /* set the scope per the existing tcb */
5698
5699 #ifdef INET6
5700                 struct sctp_nets *lnet;
5701
5702 #endif
5703
5704                 stc.loopback_scope = asoc->scope.loopback_scope;
5705                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5706                 stc.site_scope = asoc->scope.site_scope;
5707                 stc.local_scope = asoc->scope.local_scope;
5708 #ifdef INET6
5709                 /* Why do we not consider IPv4 LL addresses? */
5710                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5711                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5712                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5713                                         /*
5714                                          * if we have a LL address, start
5715                                          * counting at 1.
5716                                          */
5717                                         cnt_inits_to = 1;
5718                                 }
5719                         }
5720                 }
5721 #endif
5722                 /* use the net pointer */
5723                 to = (struct sockaddr *)&net->ro._l_addr;
5724                 switch (to->sa_family) {
5725 #ifdef INET
5726                 case AF_INET:
5727                         sin = (struct sockaddr_in *)to;
5728                         stc.address[0] = sin->sin_addr.s_addr;
5729                         stc.address[1] = 0;
5730                         stc.address[2] = 0;
5731                         stc.address[3] = 0;
5732                         stc.addr_type = SCTP_IPV4_ADDRESS;
5733                         if (net->src_addr_selected == 0) {
5734                                 /*
5735                                  * strange case here, the INIT should have
5736                                  * did the selection.
5737                                  */
5738                                 net->ro._s_addr = sctp_source_address_selection(inp,
5739                                     stcb, (sctp_route_t *) & net->ro,
5740                                     net, 0, vrf_id);
5741                                 if (net->ro._s_addr == NULL)
5742                                         return;
5743
5744                                 net->src_addr_selected = 1;
5745
5746                         }
5747                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5748                         stc.laddress[1] = 0;
5749                         stc.laddress[2] = 0;
5750                         stc.laddress[3] = 0;
5751                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5752                         /* scope_id is only for v6 */
5753                         stc.scope_id = 0;
5754                         break;
5755 #endif
5756 #ifdef INET6
5757                 case AF_INET6:
5758                         sin6 = (struct sockaddr_in6 *)to;
5759                         memcpy(&stc.address, &sin6->sin6_addr,
5760                             sizeof(struct in6_addr));
5761                         stc.addr_type = SCTP_IPV6_ADDRESS;
5762                         stc.scope_id = sin6->sin6_scope_id;
5763                         if (net->src_addr_selected == 0) {
5764                                 /*
5765                                  * strange case here, the INIT should have
5766                                  * done the selection.
5767                                  */
5768                                 net->ro._s_addr = sctp_source_address_selection(inp,
5769                                     stcb, (sctp_route_t *) & net->ro,
5770                                     net, 0, vrf_id);
5771                                 if (net->ro._s_addr == NULL)
5772                                         return;
5773
5774                                 net->src_addr_selected = 1;
5775                         }
5776                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5777                             sizeof(struct in6_addr));
5778                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5779                         break;
5780 #endif
5781                 }
5782         }
5783         /* Now lets put the SCTP header in place */
5784         initack = mtod(m, struct sctp_init_ack_chunk *);
5785         /* Save it off for quick ref */
5786         stc.peers_vtag = init_chk->init.initiate_tag;
5787         /* who are we */
5788         memcpy(stc.identification, SCTP_VERSION_STRING,
5789             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5790         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5791         /* now the chunk header */
5792         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5793         initack->ch.chunk_flags = 0;
5794         /* fill in later from mbuf we build */
5795         initack->ch.chunk_length = 0;
5796         /* place in my tag */
5797         if ((asoc != NULL) &&
5798             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5799             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5800             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5801                 /* re-use the v-tags and init-seq here */
5802                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5803                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5804         } else {
5805                 uint32_t vtag, itsn;
5806
5807                 if (hold_inp_lock) {
5808                         SCTP_INP_INCR_REF(inp);
5809                         SCTP_INP_RUNLOCK(inp);
5810                 }
5811                 if (asoc) {
5812                         atomic_add_int(&asoc->refcnt, 1);
5813                         SCTP_TCB_UNLOCK(stcb);
5814         new_tag:
5815                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5816                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5817                                 /*
5818                                  * Got a duplicate vtag on some guy behind a
5819                                  * nat make sure we don't use it.
5820                                  */
5821                                 goto new_tag;
5822                         }
5823                         initack->init.initiate_tag = htonl(vtag);
5824                         /* get a TSN to use too */
5825                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5826                         initack->init.initial_tsn = htonl(itsn);
5827                         SCTP_TCB_LOCK(stcb);
5828                         atomic_add_int(&asoc->refcnt, -1);
5829                 } else {
5830                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5831                         initack->init.initiate_tag = htonl(vtag);
5832                         /* get a TSN to use too */
5833                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5834                 }
5835                 if (hold_inp_lock) {
5836                         SCTP_INP_RLOCK(inp);
5837                         SCTP_INP_DECR_REF(inp);
5838                 }
5839         }
5840         /* save away my tag to */
5841         stc.my_vtag = initack->init.initiate_tag;
5842
5843         /* set up some of the credits. */
5844         so = inp->sctp_socket;
5845         if (so == NULL) {
5846                 /* memory problem */
5847                 sctp_m_freem(m);
5848                 return;
5849         } else {
5850                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5851         }
5852         /* set what I want */
5853         his_limit = ntohs(init_chk->init.num_inbound_streams);
5854         /* choose what I want */
5855         if (asoc != NULL) {
5856                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5857                         i_want = asoc->streamoutcnt;
5858                 } else {
5859                         i_want = inp->sctp_ep.pre_open_stream_count;
5860                 }
5861         } else {
5862                 i_want = inp->sctp_ep.pre_open_stream_count;
5863         }
5864         if (his_limit < i_want) {
5865                 /* I Want more :< */
5866                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5867         } else {
5868                 /* I can have what I want :> */
5869                 initack->init.num_outbound_streams = htons(i_want);
5870         }
5871         /* tell him his limit. */
5872         initack->init.num_inbound_streams =
5873             htons(inp->sctp_ep.max_open_streams_intome);
5874
5875         /* adaptation layer indication parameter */
5876         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5877                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5878                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5879                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5880                 ali->ph.param_length = htons(parameter_len);
5881                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5882                 chunk_len += parameter_len;
5883         }
5884         /* ECN parameter */
5885         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5886             ((asoc == NULL) && (inp->sctp_ecn_enable == 1))) {
5887                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5888                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5889                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5890                 ph->param_length = htons(parameter_len);
5891                 chunk_len += parameter_len;
5892         }
5893         /* And now tell the peer we do pr-sctp */
5894         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5895         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5896         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5897         ph->param_length = htons(parameter_len);
5898         chunk_len += parameter_len;
5899
5900         /* Add NAT friendly parameter */
5901         if (nat_friendly) {
5902                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5903                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5904                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5905                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5906                 chunk_len += sizeof(struct sctp_paramhdr);
5907         }
5908         /* And now tell the peer which extensions we support */
5909         num_ext = 0;
5910         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5911         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5912         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5913         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5914         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5915         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5916         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5917         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5918                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5919         }
5920         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off)) {
5921                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5922         }
5923         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5924         pr_supported->ph.param_length = htons(parameter_len);
5925         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5926         chunk_len += parameter_len;
5927
5928         /* add authentication parameters */
5929         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5930                 struct sctp_auth_random *randp;
5931                 struct sctp_auth_hmac_algo *hmacs;
5932                 struct sctp_auth_chunk_list *chunks;
5933
5934                 if (padding_len > 0) {
5935                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5936                         chunk_len += padding_len;
5937                         padding_len = 0;
5938                 }
5939                 /* generate and add RANDOM parameter */
5940                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5941                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
5942                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5943                 randp->ph.param_type = htons(SCTP_RANDOM);
5944                 randp->ph.param_length = htons(parameter_len);
5945                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5946                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5947                 chunk_len += parameter_len;
5948
5949                 if (padding_len > 0) {
5950                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5951                         chunk_len += padding_len;
5952                         padding_len = 0;
5953                 }
5954                 /* add HMAC_ALGO parameter */
5955                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
5956                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
5957                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5958                     (uint8_t *) hmacs->hmac_ids);
5959                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5960                 hmacs->ph.param_length = htons(parameter_len);
5961                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5962                 chunk_len += parameter_len;
5963
5964                 if (padding_len > 0) {
5965                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5966                         chunk_len += padding_len;
5967                         padding_len = 0;
5968                 }
5969                 /* add CHUNKS parameter */
5970                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
5971                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
5972                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5973                     chunks->chunk_types);
5974                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5975                 chunks->ph.param_length = htons(parameter_len);
5976                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5977                 chunk_len += parameter_len;
5978         }
5979         SCTP_BUF_LEN(m) = chunk_len;
5980         m_last = m;
5981         /* now the addresses */
5982         /*
5983          * To optimize this we could put the scoping stuff into a structure
5984          * and remove the individual uint8's from the stc structure. Then we
5985          * could just sifa in the address within the stc.. but for now this
5986          * is a quick hack to get the address stuff teased apart.
5987          */
5988         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5989         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5990         scp.loopback_scope = stc.loopback_scope;
5991         scp.ipv4_local_scope = stc.ipv4_scope;
5992         scp.local_scope = stc.local_scope;
5993         scp.site_scope = stc.site_scope;
5994         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
5995             cnt_inits_to,
5996             &padding_len, &chunk_len);
5997         /* padding_len can only be positive, if no addresses have been added */
5998         if (padding_len > 0) {
5999                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6000                 chunk_len += padding_len;
6001                 SCTP_BUF_LEN(m) += padding_len;
6002                 padding_len = 0;
6003         }
6004         /* tack on the operational error if present */
6005         if (op_err) {
6006                 parameter_len = 0;
6007                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6008                         parameter_len += SCTP_BUF_LEN(m_tmp);
6009                 }
6010                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6011                 SCTP_BUF_NEXT(m_last) = op_err;
6012                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6013                         m_last = SCTP_BUF_NEXT(m_last);
6014                 }
6015                 chunk_len += parameter_len;
6016         }
6017         if (padding_len > 0) {
6018                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6019                 if (m_last == NULL) {
6020                         /* Houston we have a problem, no space */
6021                         sctp_m_freem(m);
6022                         return;
6023                 }
6024                 chunk_len += padding_len;
6025                 padding_len = 0;
6026         }
6027         /* Now we must build a cookie */
6028         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6029         if (m_cookie == NULL) {
6030                 /* memory problem */
6031                 sctp_m_freem(m);
6032                 return;
6033         }
6034         /* Now append the cookie to the end and update the space/size */
6035         SCTP_BUF_NEXT(m_last) = m_cookie;
6036         parameter_len = 0;
6037         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6038                 parameter_len += SCTP_BUF_LEN(m_tmp);
6039                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6040                         m_last = m_tmp;
6041                 }
6042         }
6043         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6044         chunk_len += parameter_len;
6045
6046         /*
6047          * Place in the size, but we don't include the last pad (if any) in
6048          * the INIT-ACK.
6049          */
6050         initack->ch.chunk_length = htons(chunk_len);
6051
6052         /*
6053          * Time to sign the cookie, we don't sign over the cookie signature
6054          * though thus we set trailer.
6055          */
6056         (void)sctp_hmac_m(SCTP_HMAC,
6057             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6058             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6059             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6060         /*
6061          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6062          * here since the timer will drive a retranmission.
6063          */
6064         if (padding_len > 0) {
6065                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6066                         sctp_m_freem(m);
6067                         return;
6068                 }
6069         }
6070         if (stc.loopback_scope) {
6071                 over_addr = (union sctp_sockstore *)dst;
6072         } else {
6073                 over_addr = NULL;
6074         }
6075
6076         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6077             0, 0,
6078             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6079             port, over_addr,
6080             use_mflowid, mflowid,
6081             SCTP_SO_NOT_LOCKED);
6082         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6083 }
6084
6085
6086 static void
6087 sctp_prune_prsctp(struct sctp_tcb *stcb,
6088     struct sctp_association *asoc,
6089     struct sctp_sndrcvinfo *srcv,
6090     int dataout)
6091 {
6092         int freed_spc = 0;
6093         struct sctp_tmit_chunk *chk, *nchk;
6094
6095         SCTP_TCB_LOCK_ASSERT(stcb);
6096         if ((asoc->peer_supports_prsctp) &&
6097             (asoc->sent_queue_cnt_removeable > 0)) {
6098                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6099                         /*
6100                          * Look for chunks marked with the PR_SCTP flag AND
6101                          * the buffer space flag. If the one being sent is
6102                          * equal or greater priority then purge the old one
6103                          * and free some space.
6104                          */
6105                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6106                                 /*
6107                                  * This one is PR-SCTP AND buffer space
6108                                  * limited type
6109                                  */
6110                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6111                                         /*
6112                                          * Lower numbers equates to higher
6113                                          * priority so if the one we are
6114                                          * looking at has a larger or equal
6115                                          * priority we want to drop the data
6116                                          * and NOT retransmit it.
6117                                          */
6118                                         if (chk->data) {
6119                                                 /*
6120                                                  * We release the book_size
6121                                                  * if the mbuf is here
6122                                                  */
6123                                                 int ret_spc;
6124                                                 uint8_t sent;
6125
6126                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6127                                                         sent = 1;
6128                                                 else
6129                                                         sent = 0;
6130                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6131                                                     sent,
6132                                                     SCTP_SO_LOCKED);
6133                                                 freed_spc += ret_spc;
6134                                                 if (freed_spc >= dataout) {
6135                                                         return;
6136                                                 }
6137                                         }       /* if chunk was present */
6138                                 }       /* if of sufficent priority */
6139                         }       /* if chunk has enabled */
6140                 }               /* tailqforeach */
6141
6142                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6143                         /* Here we must move to the sent queue and mark */
6144                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6145                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6146                                         if (chk->data) {
6147                                                 /*
6148                                                  * We release the book_size
6149                                                  * if the mbuf is here
6150                                                  */
6151                                                 int ret_spc;
6152
6153                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6154                                                     0, SCTP_SO_LOCKED);
6155
6156                                                 freed_spc += ret_spc;
6157                                                 if (freed_spc >= dataout) {
6158                                                         return;
6159                                                 }
6160                                         }       /* end if chk->data */
6161                                 }       /* end if right class */
6162                         }       /* end if chk pr-sctp */
6163                 }               /* tailqforeachsafe (chk) */
6164         }                       /* if enabled in asoc */
6165 }
6166
6167 int
6168 sctp_get_frag_point(struct sctp_tcb *stcb,
6169     struct sctp_association *asoc)
6170 {
6171         int siz, ovh;
6172
6173         /*
6174          * For endpoints that have both v6 and v4 addresses we must reserve
6175          * room for the ipv6 header, for those that are only dealing with V4
6176          * we use a larger frag point.
6177          */
6178         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6179                 ovh = SCTP_MED_OVERHEAD;
6180         } else {
6181                 ovh = SCTP_MED_V4_OVERHEAD;
6182         }
6183
6184         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6185                 siz = asoc->smallest_mtu - ovh;
6186         else
6187                 siz = (stcb->asoc.sctp_frag_point - ovh);
6188         /*
6189          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6190          */
6191         /* A data chunk MUST fit in a cluster */
6192         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6193         /* } */
6194
6195         /* adjust for an AUTH chunk if DATA requires auth */
6196         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6197                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6198
6199         if (siz % 4) {
6200                 /* make it an even word boundary please */
6201                 siz -= (siz % 4);
6202         }
6203         return (siz);
6204 }
6205
6206 static void
6207 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6208 {
6209         /*
6210          * We assume that the user wants PR_SCTP_TTL if the user provides a
6211          * positive lifetime but does not specify any PR_SCTP policy.
6212          */
6213         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6214                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6215         } else if (sp->timetolive > 0) {
6216                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6217                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6218         } else {
6219                 return;
6220         }
6221         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6222         case CHUNK_FLAGS_PR_SCTP_BUF:
6223                 /*
6224                  * Time to live is a priority stored in tv_sec when doing
6225                  * the buffer drop thing.
6226                  */
6227                 sp->ts.tv_sec = sp->timetolive;
6228                 sp->ts.tv_usec = 0;
6229                 break;
6230         case CHUNK_FLAGS_PR_SCTP_TTL:
6231                 {
6232                         struct timeval tv;
6233
6234                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6235                         tv.tv_sec = sp->timetolive / 1000;
6236                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6237                         /*
6238                          * TODO sctp_constants.h needs alternative time
6239                          * macros when _KERNEL is undefined.
6240                          */
6241                         timevaladd(&sp->ts, &tv);
6242                 }
6243                 break;
6244         case CHUNK_FLAGS_PR_SCTP_RTX:
6245                 /*
6246                  * Time to live is a the number or retransmissions stored in
6247                  * tv_sec.
6248                  */
6249                 sp->ts.tv_sec = sp->timetolive;
6250                 sp->ts.tv_usec = 0;
6251                 break;
6252         default:
6253                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6254                     "Unknown PR_SCTP policy %u.\n",
6255                     PR_SCTP_POLICY(sp->sinfo_flags));
6256                 break;
6257         }
6258 }
6259
6260 static int
6261 sctp_msg_append(struct sctp_tcb *stcb,
6262     struct sctp_nets *net,
6263     struct mbuf *m,
6264     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6265 {
6266         int error = 0;
6267         struct mbuf *at;
6268         struct sctp_stream_queue_pending *sp = NULL;
6269         struct sctp_stream_out *strm;
6270
6271         /*
6272          * Given an mbuf chain, put it into the association send queue and
6273          * place it on the wheel
6274          */
6275         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6276                 /* Invalid stream number */
6277                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6278                 error = EINVAL;
6279                 goto out_now;
6280         }
6281         if ((stcb->asoc.stream_locked) &&
6282             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6283                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6284                 error = EINVAL;
6285                 goto out_now;
6286         }
6287         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6288         /* Now can we send this? */
6289         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6290             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6291             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6292             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6293                 /* got data while shutting down */
6294                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6295                 error = ECONNRESET;
6296                 goto out_now;
6297         }
6298         sctp_alloc_a_strmoq(stcb, sp);
6299         if (sp == NULL) {
6300                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6301                 error = ENOMEM;
6302                 goto out_now;
6303         }
6304         sp->sinfo_flags = srcv->sinfo_flags;
6305         sp->timetolive = srcv->sinfo_timetolive;
6306         sp->ppid = srcv->sinfo_ppid;
6307         sp->context = srcv->sinfo_context;
6308         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6309                 sp->net = net;
6310                 atomic_add_int(&sp->net->ref_count, 1);
6311         } else {
6312                 sp->net = NULL;
6313         }
6314         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6315         sp->stream = srcv->sinfo_stream;
6316         sp->msg_is_complete = 1;
6317         sp->sender_all_done = 1;
6318         sp->some_taken = 0;
6319         sp->data = m;
6320         sp->tail_mbuf = NULL;
6321         sctp_set_prsctp_policy(sp);
6322         /*
6323          * We could in theory (for sendall) sifa the length in, but we would
6324          * still have to hunt through the chain since we need to setup the
6325          * tail_mbuf
6326          */
6327         sp->length = 0;
6328         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6329                 if (SCTP_BUF_NEXT(at) == NULL)
6330                         sp->tail_mbuf = at;
6331                 sp->length += SCTP_BUF_LEN(at);
6332         }
6333         if (srcv->sinfo_keynumber_valid) {
6334                 sp->auth_keyid = srcv->sinfo_keynumber;
6335         } else {
6336                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6337         }
6338         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6339                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6340                 sp->holds_key_ref = 1;
6341         }
6342         if (hold_stcb_lock == 0) {
6343                 SCTP_TCB_SEND_LOCK(stcb);
6344         }
6345         sctp_snd_sb_alloc(stcb, sp->length);
6346         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6347         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6348         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6349         m = NULL;
6350         if (hold_stcb_lock == 0) {
6351                 SCTP_TCB_SEND_UNLOCK(stcb);
6352         }
6353 out_now:
6354         if (m) {
6355                 sctp_m_freem(m);
6356         }
6357         return (error);
6358 }
6359
6360
6361 static struct mbuf *
6362 sctp_copy_mbufchain(struct mbuf *clonechain,
6363     struct mbuf *outchain,
6364     struct mbuf **endofchain,
6365     int can_take_mbuf,
6366     int sizeofcpy,
6367     uint8_t copy_by_ref)
6368 {
6369         struct mbuf *m;
6370         struct mbuf *appendchain;
6371         caddr_t cp;
6372         int len;
6373
6374         if (endofchain == NULL) {
6375                 /* error */
6376 error_out:
6377                 if (outchain)
6378                         sctp_m_freem(outchain);
6379                 return (NULL);
6380         }
6381         if (can_take_mbuf) {
6382                 appendchain = clonechain;
6383         } else {
6384                 if (!copy_by_ref &&
6385                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6386                     ) {
6387                         /* Its not in a cluster */
6388                         if (*endofchain == NULL) {
6389                                 /* lets get a mbuf cluster */
6390                                 if (outchain == NULL) {
6391                                         /* This is the general case */
6392                         new_mbuf:
6393                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6394                                         if (outchain == NULL) {
6395                                                 goto error_out;
6396                                         }
6397                                         SCTP_BUF_LEN(outchain) = 0;
6398                                         *endofchain = outchain;
6399                                         /* get the prepend space */
6400                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6401                                 } else {
6402                                         /*
6403                                          * We really should not get a NULL
6404                                          * in endofchain
6405                                          */
6406                                         /* find end */
6407                                         m = outchain;
6408                                         while (m) {
6409                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6410                                                         *endofchain = m;
6411                                                         break;
6412                                                 }
6413                                                 m = SCTP_BUF_NEXT(m);
6414                                         }
6415                                         /* sanity */
6416                                         if (*endofchain == NULL) {
6417                                                 /*
6418                                                  * huh, TSNH XXX maybe we
6419                                                  * should panic
6420                                                  */
6421                                                 sctp_m_freem(outchain);
6422                                                 goto new_mbuf;
6423                                         }
6424                                 }
6425                                 /* get the new end of length */
6426                                 len = M_TRAILINGSPACE(*endofchain);
6427                         } else {
6428                                 /* how much is left at the end? */
6429                                 len = M_TRAILINGSPACE(*endofchain);
6430                         }
6431                         /* Find the end of the data, for appending */
6432                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6433
6434                         /* Now lets copy it out */
6435                         if (len >= sizeofcpy) {
6436                                 /* It all fits, copy it in */
6437                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6438                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6439                         } else {
6440                                 /* fill up the end of the chain */
6441                                 if (len > 0) {
6442                                         m_copydata(clonechain, 0, len, cp);
6443                                         SCTP_BUF_LEN((*endofchain)) += len;
6444                                         /* now we need another one */
6445                                         sizeofcpy -= len;
6446                                 }
6447                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6448                                 if (m == NULL) {
6449                                         /* We failed */
6450                                         goto error_out;
6451                                 }
6452                                 SCTP_BUF_NEXT((*endofchain)) = m;
6453                                 *endofchain = m;
6454                                 cp = mtod((*endofchain), caddr_t);
6455                                 m_copydata(clonechain, len, sizeofcpy, cp);
6456                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6457                         }
6458                         return (outchain);
6459                 } else {
6460                         /* copy the old fashion way */
6461                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6462 #ifdef SCTP_MBUF_LOGGING
6463                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6464                                 struct mbuf *mat;
6465
6466                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6467                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6468                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6469                                         }
6470                                 }
6471                         }
6472 #endif
6473                 }
6474         }
6475         if (appendchain == NULL) {
6476                 /* error */
6477                 if (outchain)
6478                         sctp_m_freem(outchain);
6479                 return (NULL);
6480         }
6481         if (outchain) {
6482                 /* tack on to the end */
6483                 if (*endofchain != NULL) {
6484                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6485                 } else {
6486                         m = outchain;
6487                         while (m) {
6488                                 if (SCTP_BUF_NEXT(m) == NULL) {
6489                                         SCTP_BUF_NEXT(m) = appendchain;
6490                                         break;
6491                                 }
6492                                 m = SCTP_BUF_NEXT(m);
6493                         }
6494                 }
6495                 /*
6496                  * save off the end and update the end-chain postion
6497                  */
6498                 m = appendchain;
6499                 while (m) {
6500                         if (SCTP_BUF_NEXT(m) == NULL) {
6501                                 *endofchain = m;
6502                                 break;
6503                         }
6504                         m = SCTP_BUF_NEXT(m);
6505                 }
6506                 return (outchain);
6507         } else {
6508                 /* save off the end and update the end-chain postion */
6509                 m = appendchain;
6510                 while (m) {
6511                         if (SCTP_BUF_NEXT(m) == NULL) {
6512                                 *endofchain = m;
6513                                 break;
6514                         }
6515                         m = SCTP_BUF_NEXT(m);
6516                 }
6517                 return (appendchain);
6518         }
6519 }
6520
6521 static int
6522 sctp_med_chunk_output(struct sctp_inpcb *inp,
6523     struct sctp_tcb *stcb,
6524     struct sctp_association *asoc,
6525     int *num_out,
6526     int *reason_code,
6527     int control_only, int from_where,
6528     struct timeval *now, int *now_filled, int frag_point, int so_locked
6529 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6530     SCTP_UNUSED
6531 #endif
6532 );
6533
6534 static void
6535 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6536     uint32_t val SCTP_UNUSED)
6537 {
6538         struct sctp_copy_all *ca;
6539         struct mbuf *m;
6540         int ret = 0;
6541         int added_control = 0;
6542         int un_sent, do_chunk_output = 1;
6543         struct sctp_association *asoc;
6544         struct sctp_nets *net;
6545
6546         ca = (struct sctp_copy_all *)ptr;
6547         if (ca->m == NULL) {
6548                 return;
6549         }
6550         if (ca->inp != inp) {
6551                 /* TSNH */
6552                 return;
6553         }
6554         if (ca->sndlen > 0) {
6555                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6556                 if (m == NULL) {
6557                         /* can't copy so we are done */
6558                         ca->cnt_failed++;
6559                         return;
6560                 }
6561 #ifdef SCTP_MBUF_LOGGING
6562                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6563                         struct mbuf *mat;
6564
6565                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6566                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6567                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6568                                 }
6569                         }
6570                 }
6571 #endif
6572         } else {
6573                 m = NULL;
6574         }
6575         SCTP_TCB_LOCK_ASSERT(stcb);
6576         if (stcb->asoc.alternate) {
6577                 net = stcb->asoc.alternate;
6578         } else {
6579                 net = stcb->asoc.primary_destination;
6580         }
6581         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6582                 /* Abort this assoc with m as the user defined reason */
6583                 if (m != NULL) {
6584                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6585                 } else {
6586                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6587                             0, M_NOWAIT, 1, MT_DATA);
6588                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6589                 }
6590                 if (m != NULL) {
6591                         struct sctp_paramhdr *ph;
6592
6593                         ph = mtod(m, struct sctp_paramhdr *);
6594                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6595                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6596                 }
6597                 /*
6598                  * We add one here to keep the assoc from dis-appearing on
6599                  * us.
6600                  */
6601                 atomic_add_int(&stcb->asoc.refcnt, 1);
6602                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6603                 /*
6604                  * sctp_abort_an_association calls sctp_free_asoc() free
6605                  * association will NOT free it since we incremented the
6606                  * refcnt .. we do this to prevent it being freed and things
6607                  * getting tricky since we could end up (from free_asoc)
6608                  * calling inpcb_free which would get a recursive lock call
6609                  * to the iterator lock.. But as a consequence of that the
6610                  * stcb will return to us un-locked.. since free_asoc
6611                  * returns with either no TCB or the TCB unlocked, we must
6612                  * relock.. to unlock in the iterator timer :-0
6613                  */
6614                 SCTP_TCB_LOCK(stcb);
6615                 atomic_add_int(&stcb->asoc.refcnt, -1);
6616                 goto no_chunk_output;
6617         } else {
6618                 if (m) {
6619                         ret = sctp_msg_append(stcb, net, m,
6620                             &ca->sndrcv, 1);
6621                 }
6622                 asoc = &stcb->asoc;
6623                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6624                         /* shutdown this assoc */
6625                         int cnt;
6626
6627                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6628
6629                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6630                             TAILQ_EMPTY(&asoc->sent_queue) &&
6631                             (cnt == 0)) {
6632                                 if (asoc->locked_on_sending) {
6633                                         goto abort_anyway;
6634                                 }
6635                                 /*
6636                                  * there is nothing queued to send, so I'm
6637                                  * done...
6638                                  */
6639                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6640                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6641                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6642                                         /*
6643                                          * only send SHUTDOWN the first time
6644                                          * through
6645                                          */
6646                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6647                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6648                                         }
6649                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6650                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6651                                         sctp_stop_timers_for_shutdown(stcb);
6652                                         sctp_send_shutdown(stcb, net);
6653                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6654                                             net);
6655                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6656                                             asoc->primary_destination);
6657                                         added_control = 1;
6658                                         do_chunk_output = 0;
6659                                 }
6660                         } else {
6661                                 /*
6662                                  * we still got (or just got) data to send,
6663                                  * so set SHUTDOWN_PENDING
6664                                  */
6665                                 /*
6666                                  * XXX sockets draft says that SCTP_EOF
6667                                  * should be sent with no data.  currently,
6668                                  * we will allow user data to be sent first
6669                                  * and move to SHUTDOWN-PENDING
6670                                  */
6671                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6672                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6673                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6674                                         if (asoc->locked_on_sending) {
6675                                                 /*
6676                                                  * Locked to send out the
6677                                                  * data
6678                                                  */
6679                                                 struct sctp_stream_queue_pending *sp;
6680
6681                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6682                                                 if (sp) {
6683                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6684                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6685                                                 }
6686                                         }
6687                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6688                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6689                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6690                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6691                                 abort_anyway:
6692                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6693                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6694                                                     NULL, SCTP_SO_NOT_LOCKED);
6695                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6696                                                 goto no_chunk_output;
6697                                         }
6698                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6699                                             asoc->primary_destination);
6700                                 }
6701                         }
6702
6703                 }
6704         }
6705         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6706             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6707
6708         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6709             (stcb->asoc.total_flight > 0) &&
6710             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6711                 do_chunk_output = 0;
6712         }
6713         if (do_chunk_output)
6714                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6715         else if (added_control) {
6716                 int num_out = 0, reason = 0, now_filled = 0;
6717                 struct timeval now;
6718                 int frag_point;
6719
6720                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6721                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6722                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6723         }
6724 no_chunk_output:
6725         if (ret) {
6726                 ca->cnt_failed++;
6727         } else {
6728                 ca->cnt_sent++;
6729         }
6730 }
6731
6732 static void
6733 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6734 {
6735         struct sctp_copy_all *ca;
6736
6737         ca = (struct sctp_copy_all *)ptr;
6738         /*
6739          * Do a notify here? Kacheong suggests that the notify be done at
6740          * the send time.. so you would push up a notification if any send
6741          * failed. Don't know if this is feasable since the only failures we
6742          * have is "memory" related and if you cannot get an mbuf to send
6743          * the data you surely can't get an mbuf to send up to notify the
6744          * user you can't send the data :->
6745          */
6746
6747         /* now free everything */
6748         sctp_m_freem(ca->m);
6749         SCTP_FREE(ca, SCTP_M_COPYAL);
6750 }
6751
6752
6753 #define MC_ALIGN(m, len) do {                                           \
6754         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6755 } while (0)
6756
6757
6758
6759 static struct mbuf *
6760 sctp_copy_out_all(struct uio *uio, int len)
6761 {
6762         struct mbuf *ret, *at;
6763         int left, willcpy, cancpy, error;
6764
6765         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6766         if (ret == NULL) {
6767                 /* TSNH */
6768                 return (NULL);
6769         }
6770         left = len;
6771         SCTP_BUF_LEN(ret) = 0;
6772         /* save space for the data chunk header */
6773         cancpy = M_TRAILINGSPACE(ret);
6774         willcpy = min(cancpy, left);
6775         at = ret;
6776         while (left > 0) {
6777                 /* Align data to the end */
6778                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6779                 if (error) {
6780         err_out_now:
6781                         sctp_m_freem(at);
6782                         return (NULL);
6783                 }
6784                 SCTP_BUF_LEN(at) = willcpy;
6785                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6786                 left -= willcpy;
6787                 if (left > 0) {
6788                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6789                         if (SCTP_BUF_NEXT(at) == NULL) {
6790                                 goto err_out_now;
6791                         }
6792                         at = SCTP_BUF_NEXT(at);
6793                         SCTP_BUF_LEN(at) = 0;
6794                         cancpy = M_TRAILINGSPACE(at);
6795                         willcpy = min(cancpy, left);
6796                 }
6797         }
6798         return (ret);
6799 }
6800
6801 static int
6802 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6803     struct sctp_sndrcvinfo *srcv)
6804 {
6805         int ret;
6806         struct sctp_copy_all *ca;
6807
6808         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6809             SCTP_M_COPYAL);
6810         if (ca == NULL) {
6811                 sctp_m_freem(m);
6812                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6813                 return (ENOMEM);
6814         }
6815         memset(ca, 0, sizeof(struct sctp_copy_all));
6816
6817         ca->inp = inp;
6818         if (srcv) {
6819                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6820         }
6821         /*
6822          * take off the sendall flag, it would be bad if we failed to do
6823          * this :-0
6824          */
6825         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6826         /* get length and mbuf chain */
6827         if (uio) {
6828                 ca->sndlen = uio->uio_resid;
6829                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6830                 if (ca->m == NULL) {
6831                         SCTP_FREE(ca, SCTP_M_COPYAL);
6832                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6833                         return (ENOMEM);
6834                 }
6835         } else {
6836                 /* Gather the length of the send */
6837                 struct mbuf *mat;
6838
6839                 ca->sndlen = 0;
6840                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6841                         ca->sndlen += SCTP_BUF_LEN(mat);
6842                 }
6843         }
6844         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6845             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6846             SCTP_ASOC_ANY_STATE,
6847             (void *)ca, 0,
6848             sctp_sendall_completes, inp, 1);
6849         if (ret) {
6850                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6851                 SCTP_FREE(ca, SCTP_M_COPYAL);
6852                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6853                 return (EFAULT);
6854         }
6855         return (0);
6856 }
6857
6858
6859 void
6860 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6861 {
6862         struct sctp_tmit_chunk *chk, *nchk;
6863
6864         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6865                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6866                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6867                         if (chk->data) {
6868                                 sctp_m_freem(chk->data);
6869                                 chk->data = NULL;
6870                         }
6871                         asoc->ctrl_queue_cnt--;
6872                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6873                 }
6874         }
6875 }
6876
6877 void
6878 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6879 {
6880         struct sctp_association *asoc;
6881         struct sctp_tmit_chunk *chk, *nchk;
6882         struct sctp_asconf_chunk *acp;
6883
6884         asoc = &stcb->asoc;
6885         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6886                 /* find SCTP_ASCONF chunk in queue */
6887                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6888                         if (chk->data) {
6889                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6890                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6891                                         /* Not Acked yet */
6892                                         break;
6893                                 }
6894                         }
6895                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6896                         if (chk->data) {
6897                                 sctp_m_freem(chk->data);
6898                                 chk->data = NULL;
6899                         }
6900                         asoc->ctrl_queue_cnt--;
6901                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6902                 }
6903         }
6904 }
6905
6906
6907 static void
6908 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6909     struct sctp_association *asoc,
6910     struct sctp_tmit_chunk **data_list,
6911     int bundle_at,
6912     struct sctp_nets *net)
6913 {
6914         int i;
6915         struct sctp_tmit_chunk *tp1;
6916
6917         for (i = 0; i < bundle_at; i++) {
6918                 /* off of the send queue */
6919                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6920                 asoc->send_queue_cnt--;
6921                 if (i > 0) {
6922                         /*
6923                          * Any chunk NOT 0 you zap the time chunk 0 gets
6924                          * zapped or set based on if a RTO measurment is
6925                          * needed.
6926                          */
6927                         data_list[i]->do_rtt = 0;
6928                 }
6929                 /* record time */
6930                 data_list[i]->sent_rcv_time = net->last_sent_time;
6931                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6932                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6933                 if (data_list[i]->whoTo == NULL) {
6934                         data_list[i]->whoTo = net;
6935                         atomic_add_int(&net->ref_count, 1);
6936                 }
6937                 /* on to the sent queue */
6938                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6939                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6940                         struct sctp_tmit_chunk *tpp;
6941
6942                         /* need to move back */
6943         back_up_more:
6944                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6945                         if (tpp == NULL) {
6946                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6947                                 goto all_done;
6948                         }
6949                         tp1 = tpp;
6950                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6951                                 goto back_up_more;
6952                         }
6953                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6954                 } else {
6955                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6956                             data_list[i],
6957                             sctp_next);
6958                 }
6959 all_done:
6960                 /* This does not lower until the cum-ack passes it */
6961                 asoc->sent_queue_cnt++;
6962                 if ((asoc->peers_rwnd <= 0) &&
6963                     (asoc->total_flight == 0) &&
6964                     (bundle_at == 1)) {
6965                         /* Mark the chunk as being a window probe */
6966                         SCTP_STAT_INCR(sctps_windowprobed);
6967                 }
6968 #ifdef SCTP_AUDITING_ENABLED
6969                 sctp_audit_log(0xC2, 3);
6970 #endif
6971                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6972                 data_list[i]->snd_count = 1;
6973                 data_list[i]->rec.data.chunk_was_revoked = 0;
6974                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6975                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6976                             data_list[i]->whoTo->flight_size,
6977                             data_list[i]->book_size,
6978                             (uintptr_t) data_list[i]->whoTo,
6979                             data_list[i]->rec.data.TSN_seq);
6980                 }
6981                 sctp_flight_size_increase(data_list[i]);
6982                 sctp_total_flight_increase(stcb, data_list[i]);
6983                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6984                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6985                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6986                 }
6987                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6988                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6989                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6990                         /* SWS sender side engages */
6991                         asoc->peers_rwnd = 0;
6992                 }
6993         }
6994         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6995                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6996         }
6997 }
6998
6999 static void
7000 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7001 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7002     SCTP_UNUSED
7003 #endif
7004 )
7005 {
7006         struct sctp_tmit_chunk *chk, *nchk;
7007
7008         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7009                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7010                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7011                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7012                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7013                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7014                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7015                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7016                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7017                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7018                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7019                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7020                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7021                         /* Stray chunks must be cleaned up */
7022         clean_up_anyway:
7023                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7024                         if (chk->data) {
7025                                 sctp_m_freem(chk->data);
7026                                 chk->data = NULL;
7027                         }
7028                         asoc->ctrl_queue_cnt--;
7029                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7030                                 asoc->fwd_tsn_cnt--;
7031                         sctp_free_a_chunk(stcb, chk, so_locked);
7032                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7033                         /* special handling, we must look into the param */
7034                         if (chk != asoc->str_reset) {
7035                                 goto clean_up_anyway;
7036                         }
7037                 }
7038         }
7039 }
7040
7041
7042 static int
7043 sctp_can_we_split_this(struct sctp_tcb *stcb,
7044     uint32_t length,
7045     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7046 {
7047         /*
7048          * Make a decision on if I should split a msg into multiple parts.
7049          * This is only asked of incomplete messages.
7050          */
7051         if (eeor_on) {
7052                 /*
7053                  * If we are doing EEOR we need to always send it if its the
7054                  * entire thing, since it might be all the guy is putting in
7055                  * the hopper.
7056                  */
7057                 if (goal_mtu >= length) {
7058                         /*-
7059                          * If we have data outstanding,
7060                          * we get another chance when the sack
7061                          * arrives to transmit - wait for more data
7062                          */
7063                         if (stcb->asoc.total_flight == 0) {
7064                                 /*
7065                                  * If nothing is in flight, we zero the
7066                                  * packet counter.
7067                                  */
7068                                 return (length);
7069                         }
7070                         return (0);
7071
7072                 } else {
7073                         /* You can fill the rest */
7074                         return (goal_mtu);
7075                 }
7076         }
7077         /*-
7078          * For those strange folk that make the send buffer
7079          * smaller than our fragmentation point, we can't
7080          * get a full msg in so we have to allow splitting.
7081          */
7082         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7083                 return (length);
7084         }
7085         if ((length <= goal_mtu) ||
7086             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7087                 /* Sub-optimial residual don't split in non-eeor mode. */
7088                 return (0);
7089         }
7090         /*
7091          * If we reach here length is larger than the goal_mtu. Do we wish
7092          * to split it for the sake of packet putting together?
7093          */
7094         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7095                 /* Its ok to split it */
7096                 return (min(goal_mtu, frag_point));
7097         }
7098         /* Nope, can't split */
7099         return (0);
7100
7101 }
7102
7103 static uint32_t
7104 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7105     struct sctp_stream_out *strq,
7106     uint32_t goal_mtu,
7107     uint32_t frag_point,
7108     int *locked,
7109     int *giveup,
7110     int eeor_mode,
7111     int *bail,
7112     int so_locked
7113 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7114     SCTP_UNUSED
7115 #endif
7116 )
7117 {
7118         /* Move from the stream to the send_queue keeping track of the total */
7119         struct sctp_association *asoc;
7120         struct sctp_stream_queue_pending *sp;
7121         struct sctp_tmit_chunk *chk;
7122         struct sctp_data_chunk *dchkh;
7123         uint32_t to_move, length;
7124         uint8_t rcv_flags = 0;
7125         uint8_t some_taken;
7126         uint8_t send_lock_up = 0;
7127
7128         SCTP_TCB_LOCK_ASSERT(stcb);
7129         asoc = &stcb->asoc;
7130 one_more_time:
7131         /* sa_ignore FREED_MEMORY */
7132         sp = TAILQ_FIRST(&strq->outqueue);
7133         if (sp == NULL) {
7134                 *locked = 0;
7135                 if (send_lock_up == 0) {
7136                         SCTP_TCB_SEND_LOCK(stcb);
7137                         send_lock_up = 1;
7138                 }
7139                 sp = TAILQ_FIRST(&strq->outqueue);
7140                 if (sp) {
7141                         goto one_more_time;
7142                 }
7143                 if (strq->last_msg_incomplete) {
7144                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7145                             strq->stream_no,
7146                             strq->last_msg_incomplete);
7147                         strq->last_msg_incomplete = 0;
7148                 }
7149                 to_move = 0;
7150                 if (send_lock_up) {
7151                         SCTP_TCB_SEND_UNLOCK(stcb);
7152                         send_lock_up = 0;
7153                 }
7154                 goto out_of;
7155         }
7156         if ((sp->msg_is_complete) && (sp->length == 0)) {
7157                 if (sp->sender_all_done) {
7158                         /*
7159                          * We are doing differed cleanup. Last time through
7160                          * when we took all the data the sender_all_done was
7161                          * not set.
7162                          */
7163                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7164                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7165                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7166                                     sp->sender_all_done,
7167                                     sp->length,
7168                                     sp->msg_is_complete,
7169                                     sp->put_last_out,
7170                                     send_lock_up);
7171                         }
7172                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7173                                 SCTP_TCB_SEND_LOCK(stcb);
7174                                 send_lock_up = 1;
7175                         }
7176                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7177                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7178                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7179                         if (sp->net) {
7180                                 sctp_free_remote_addr(sp->net);
7181                                 sp->net = NULL;
7182                         }
7183                         if (sp->data) {
7184                                 sctp_m_freem(sp->data);
7185                                 sp->data = NULL;
7186                         }
7187                         sctp_free_a_strmoq(stcb, sp, so_locked);
7188                         /* we can't be locked to it */
7189                         *locked = 0;
7190                         stcb->asoc.locked_on_sending = NULL;
7191                         if (send_lock_up) {
7192                                 SCTP_TCB_SEND_UNLOCK(stcb);
7193                                 send_lock_up = 0;
7194                         }
7195                         /* back to get the next msg */
7196                         goto one_more_time;
7197                 } else {
7198                         /*
7199                          * sender just finished this but still holds a
7200                          * reference
7201                          */
7202                         *locked = 1;
7203                         *giveup = 1;
7204                         to_move = 0;
7205                         goto out_of;
7206                 }
7207         } else {
7208                 /* is there some to get */
7209                 if (sp->length == 0) {
7210                         /* no */
7211                         *locked = 1;
7212                         *giveup = 1;
7213                         to_move = 0;
7214                         goto out_of;
7215                 } else if (sp->discard_rest) {
7216                         if (send_lock_up == 0) {
7217                                 SCTP_TCB_SEND_LOCK(stcb);
7218                                 send_lock_up = 1;
7219                         }
7220                         /* Whack down the size */
7221                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7222                         if ((stcb->sctp_socket != NULL) && \
7223                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7224                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7225                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7226                         }
7227                         if (sp->data) {
7228                                 sctp_m_freem(sp->data);
7229                                 sp->data = NULL;
7230                                 sp->tail_mbuf = NULL;
7231                         }
7232                         sp->length = 0;
7233                         sp->some_taken = 1;
7234                         *locked = 1;
7235                         *giveup = 1;
7236                         to_move = 0;
7237                         goto out_of;
7238                 }
7239         }
7240         some_taken = sp->some_taken;
7241         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7242                 sp->msg_is_complete = 1;
7243         }
7244 re_look:
7245         length = sp->length;
7246         if (sp->msg_is_complete) {
7247                 /* The message is complete */
7248                 to_move = min(length, frag_point);
7249                 if (to_move == length) {
7250                         /* All of it fits in the MTU */
7251                         if (sp->some_taken) {
7252                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7253                                 sp->put_last_out = 1;
7254                         } else {
7255                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7256                                 sp->put_last_out = 1;
7257                         }
7258                 } else {
7259                         /* Not all of it fits, we fragment */
7260                         if (sp->some_taken == 0) {
7261                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7262                         }
7263                         sp->some_taken = 1;
7264                 }
7265         } else {
7266                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7267                 if (to_move) {
7268                         /*-
7269                          * We use a snapshot of length in case it
7270                          * is expanding during the compare.
7271                          */
7272                         uint32_t llen;
7273
7274                         llen = length;
7275                         if (to_move >= llen) {
7276                                 to_move = llen;
7277                                 if (send_lock_up == 0) {
7278                                         /*-
7279                                          * We are taking all of an incomplete msg
7280                                          * thus we need a send lock.
7281                                          */
7282                                         SCTP_TCB_SEND_LOCK(stcb);
7283                                         send_lock_up = 1;
7284                                         if (sp->msg_is_complete) {
7285                                                 /*
7286                                                  * the sender finished the
7287                                                  * msg
7288                                                  */
7289                                                 goto re_look;
7290                                         }
7291                                 }
7292                         }
7293                         if (sp->some_taken == 0) {
7294                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7295                                 sp->some_taken = 1;
7296                         }
7297                 } else {
7298                         /* Nothing to take. */
7299                         if (sp->some_taken) {
7300                                 *locked = 1;
7301                         }
7302                         *giveup = 1;
7303                         to_move = 0;
7304                         goto out_of;
7305                 }
7306         }
7307
7308         /* If we reach here, we can copy out a chunk */
7309         sctp_alloc_a_chunk(stcb, chk);
7310         if (chk == NULL) {
7311                 /* No chunk memory */
7312                 *giveup = 1;
7313                 to_move = 0;
7314                 goto out_of;
7315         }
7316         /*
7317          * Setup for unordered if needed by looking at the user sent info
7318          * flags.
7319          */
7320         if (sp->sinfo_flags & SCTP_UNORDERED) {
7321                 rcv_flags |= SCTP_DATA_UNORDERED;
7322         }
7323         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7324             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7325                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7326         }
7327         /* clear out the chunk before setting up */
7328         memset(chk, 0, sizeof(*chk));
7329         chk->rec.data.rcv_flags = rcv_flags;
7330
7331         if (to_move >= length) {
7332                 /* we think we can steal the whole thing */
7333                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7334                         SCTP_TCB_SEND_LOCK(stcb);
7335                         send_lock_up = 1;
7336                 }
7337                 if (to_move < sp->length) {
7338                         /* bail, it changed */
7339                         goto dont_do_it;
7340                 }
7341                 chk->data = sp->data;
7342                 chk->last_mbuf = sp->tail_mbuf;
7343                 /* register the stealing */
7344                 sp->data = sp->tail_mbuf = NULL;
7345         } else {
7346                 struct mbuf *m;
7347
7348 dont_do_it:
7349                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7350                 chk->last_mbuf = NULL;
7351                 if (chk->data == NULL) {
7352                         sp->some_taken = some_taken;
7353                         sctp_free_a_chunk(stcb, chk, so_locked);
7354                         *bail = 1;
7355                         to_move = 0;
7356                         goto out_of;
7357                 }
7358 #ifdef SCTP_MBUF_LOGGING
7359                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7360                         struct mbuf *mat;
7361
7362                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7363                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7364                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7365                                 }
7366                         }
7367                 }
7368 #endif
7369                 /* Pull off the data */
7370                 m_adj(sp->data, to_move);
7371                 /* Now lets work our way down and compact it */
7372                 m = sp->data;
7373                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7374                         sp->data = SCTP_BUF_NEXT(m);
7375                         SCTP_BUF_NEXT(m) = NULL;
7376                         if (sp->tail_mbuf == m) {
7377                                 /*-
7378                                  * Freeing tail? TSNH since
7379                                  * we supposedly were taking less
7380                                  * than the sp->length.
7381                                  */
7382 #ifdef INVARIANTS
7383                                 panic("Huh, freing tail? - TSNH");
7384 #else
7385                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7386                                 sp->tail_mbuf = sp->data = NULL;
7387                                 sp->length = 0;
7388 #endif
7389
7390                         }
7391                         sctp_m_free(m);
7392                         m = sp->data;
7393                 }
7394         }
7395         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7396                 chk->copy_by_ref = 1;
7397         } else {
7398                 chk->copy_by_ref = 0;
7399         }
7400         /*
7401          * get last_mbuf and counts of mb useage This is ugly but hopefully
7402          * its only one mbuf.
7403          */
7404         if (chk->last_mbuf == NULL) {
7405                 chk->last_mbuf = chk->data;
7406                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7407                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7408                 }
7409         }
7410         if (to_move > length) {
7411                 /*- This should not happen either
7412                  * since we always lower to_move to the size
7413                  * of sp->length if its larger.
7414                  */
7415 #ifdef INVARIANTS
7416                 panic("Huh, how can to_move be larger?");
7417 #else
7418                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7419                 sp->length = 0;
7420 #endif
7421         } else {
7422                 atomic_subtract_int(&sp->length, to_move);
7423         }
7424         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7425                 /* Not enough room for a chunk header, get some */
7426                 struct mbuf *m;
7427
7428                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7429                 if (m == NULL) {
7430                         /*
7431                          * we're in trouble here. _PREPEND below will free
7432                          * all the data if there is no leading space, so we
7433                          * must put the data back and restore.
7434                          */
7435                         if (send_lock_up == 0) {
7436                                 SCTP_TCB_SEND_LOCK(stcb);
7437                                 send_lock_up = 1;
7438                         }
7439                         if (chk->data == NULL) {
7440                                 /* unsteal the data */
7441                                 sp->data = chk->data;
7442                                 sp->tail_mbuf = chk->last_mbuf;
7443                         } else {
7444                                 struct mbuf *m_tmp;
7445
7446                                 /* reassemble the data */
7447                                 m_tmp = sp->data;
7448                                 sp->data = chk->data;
7449                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7450                         }
7451                         sp->some_taken = some_taken;
7452                         atomic_add_int(&sp->length, to_move);
7453                         chk->data = NULL;
7454                         *bail = 1;
7455                         sctp_free_a_chunk(stcb, chk, so_locked);
7456                         to_move = 0;
7457                         goto out_of;
7458                 } else {
7459                         SCTP_BUF_LEN(m) = 0;
7460                         SCTP_BUF_NEXT(m) = chk->data;
7461                         chk->data = m;
7462                         M_ALIGN(chk->data, 4);
7463                 }
7464         }
7465         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7466         if (chk->data == NULL) {
7467                 /* HELP, TSNH since we assured it would not above? */
7468 #ifdef INVARIANTS
7469                 panic("prepend failes HELP?");
7470 #else
7471                 SCTP_PRINTF("prepend fails HELP?\n");
7472                 sctp_free_a_chunk(stcb, chk, so_locked);
7473 #endif
7474                 *bail = 1;
7475                 to_move = 0;
7476                 goto out_of;
7477         }
7478         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7479         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7480         chk->book_size_scale = 0;
7481         chk->sent = SCTP_DATAGRAM_UNSENT;
7482
7483         chk->flags = 0;
7484         chk->asoc = &stcb->asoc;
7485         chk->pad_inplace = 0;
7486         chk->no_fr_allowed = 0;
7487         chk->rec.data.stream_seq = strq->next_sequence_send;
7488         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7489             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7490                 strq->next_sequence_send++;
7491         }
7492         chk->rec.data.stream_number = sp->stream;
7493         chk->rec.data.payloadtype = sp->ppid;
7494         chk->rec.data.context = sp->context;
7495         chk->rec.data.doing_fast_retransmit = 0;
7496
7497         chk->rec.data.timetodrop = sp->ts;
7498         chk->flags = sp->act_flags;
7499
7500         if (sp->net) {
7501                 chk->whoTo = sp->net;
7502                 atomic_add_int(&chk->whoTo->ref_count, 1);
7503         } else
7504                 chk->whoTo = NULL;
7505
7506         if (sp->holds_key_ref) {
7507                 chk->auth_keyid = sp->auth_keyid;
7508                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7509                 chk->holds_key_ref = 1;
7510         }
7511         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7512         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7513                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7514                     (uintptr_t) stcb, sp->length,
7515                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7516                     chk->rec.data.TSN_seq);
7517         }
7518         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7519         /*
7520          * Put the rest of the things in place now. Size was done earlier in
7521          * previous loop prior to padding.
7522          */
7523
7524 #ifdef SCTP_ASOCLOG_OF_TSNS
7525         SCTP_TCB_LOCK_ASSERT(stcb);
7526         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7527                 asoc->tsn_out_at = 0;
7528                 asoc->tsn_out_wrapped = 1;
7529         }
7530         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7531         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7532         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7533         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7534         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7535         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7536         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7537         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7538         asoc->tsn_out_at++;
7539 #endif
7540
7541         dchkh->ch.chunk_type = SCTP_DATA;
7542         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7543         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7544         dchkh->dp.stream_id = htons(strq->stream_no);
7545         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7546         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7547         dchkh->ch.chunk_length = htons(chk->send_size);
7548         /* Now advance the chk->send_size by the actual pad needed. */
7549         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7550                 /* need a pad */
7551                 struct mbuf *lm;
7552                 int pads;
7553
7554                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7555                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7556                 if (lm != NULL) {
7557                         chk->last_mbuf = lm;
7558                         chk->pad_inplace = 1;
7559                 }
7560                 chk->send_size += pads;
7561         }
7562         if (PR_SCTP_ENABLED(chk->flags)) {
7563                 asoc->pr_sctp_cnt++;
7564         }
7565         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7566                 /* All done pull and kill the message */
7567                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7568                 if (sp->put_last_out == 0) {
7569                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7570                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7571                             sp->sender_all_done,
7572                             sp->length,
7573                             sp->msg_is_complete,
7574                             sp->put_last_out,
7575                             send_lock_up);
7576                 }
7577                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7578                         SCTP_TCB_SEND_LOCK(stcb);
7579                         send_lock_up = 1;
7580                 }
7581                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7582                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7583                 if (sp->net) {
7584                         sctp_free_remote_addr(sp->net);
7585                         sp->net = NULL;
7586                 }
7587                 if (sp->data) {
7588                         sctp_m_freem(sp->data);
7589                         sp->data = NULL;
7590                 }
7591                 sctp_free_a_strmoq(stcb, sp, so_locked);
7592
7593                 /* we can't be locked to it */
7594                 *locked = 0;
7595                 stcb->asoc.locked_on_sending = NULL;
7596         } else {
7597                 /* more to go, we are locked */
7598                 *locked = 1;
7599         }
7600         asoc->chunks_on_out_queue++;
7601         strq->chunks_on_queues++;
7602         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7603         asoc->send_queue_cnt++;
7604 out_of:
7605         if (send_lock_up) {
7606                 SCTP_TCB_SEND_UNLOCK(stcb);
7607         }
7608         return (to_move);
7609 }
7610
7611
7612 static void
7613 sctp_fill_outqueue(struct sctp_tcb *stcb,
7614     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7615 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7616     SCTP_UNUSED
7617 #endif
7618 )
7619 {
7620         struct sctp_association *asoc;
7621         struct sctp_stream_out *strq;
7622         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7623         int locked, giveup;
7624
7625         SCTP_TCB_LOCK_ASSERT(stcb);
7626         asoc = &stcb->asoc;
7627         switch (net->ro._l_addr.sa.sa_family) {
7628 #ifdef INET
7629         case AF_INET:
7630                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7631                 break;
7632 #endif
7633 #ifdef INET6
7634         case AF_INET6:
7635                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7636                 break;
7637 #endif
7638         default:
7639                 /* TSNH */
7640                 goal_mtu = net->mtu;
7641                 break;
7642         }
7643         /* Need an allowance for the data chunk header too */
7644         goal_mtu -= sizeof(struct sctp_data_chunk);
7645
7646         /* must make even word boundary */
7647         goal_mtu &= 0xfffffffc;
7648         if (asoc->locked_on_sending) {
7649                 /* We are stuck on one stream until the message completes. */
7650                 strq = asoc->locked_on_sending;
7651                 locked = 1;
7652         } else {
7653                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7654                 locked = 0;
7655         }
7656         while ((goal_mtu > 0) && strq) {
7657                 giveup = 0;
7658                 bail = 0;
7659                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7660                     &giveup, eeor_mode, &bail, so_locked);
7661                 if (moved_how_much)
7662                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7663
7664                 if (locked) {
7665                         asoc->locked_on_sending = strq;
7666                         if ((moved_how_much == 0) || (giveup) || bail)
7667                                 /* no more to move for now */
7668                                 break;
7669                 } else {
7670                         asoc->locked_on_sending = NULL;
7671                         if ((giveup) || bail) {
7672                                 break;
7673                         }
7674                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7675                         if (strq == NULL) {
7676                                 break;
7677                         }
7678                 }
7679                 total_moved += moved_how_much;
7680                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7681                 goal_mtu &= 0xfffffffc;
7682         }
7683         if (bail)
7684                 *quit_now = 1;
7685
7686         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7687
7688         if (total_moved == 0) {
7689                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7690                     (net == stcb->asoc.primary_destination)) {
7691                         /* ran dry for primary network net */
7692                         SCTP_STAT_INCR(sctps_primary_randry);
7693                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7694                         /* ran dry with CMT on */
7695                         SCTP_STAT_INCR(sctps_cmt_randry);
7696                 }
7697         }
7698 }
7699
7700 void
7701 sctp_fix_ecn_echo(struct sctp_association *asoc)
7702 {
7703         struct sctp_tmit_chunk *chk;
7704
7705         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7706                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7707                         chk->sent = SCTP_DATAGRAM_UNSENT;
7708                 }
7709         }
7710 }
7711
7712 void
7713 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7714 {
7715         struct sctp_association *asoc;
7716         struct sctp_tmit_chunk *chk;
7717         struct sctp_stream_queue_pending *sp;
7718         unsigned int i;
7719
7720         if (net == NULL) {
7721                 return;
7722         }
7723         asoc = &stcb->asoc;
7724         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7725                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7726                         if (sp->net == net) {
7727                                 sctp_free_remote_addr(sp->net);
7728                                 sp->net = NULL;
7729                         }
7730                 }
7731         }
7732         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7733                 if (chk->whoTo == net) {
7734                         sctp_free_remote_addr(chk->whoTo);
7735                         chk->whoTo = NULL;
7736                 }
7737         }
7738 }
7739
7740 int
7741 sctp_med_chunk_output(struct sctp_inpcb *inp,
7742     struct sctp_tcb *stcb,
7743     struct sctp_association *asoc,
7744     int *num_out,
7745     int *reason_code,
7746     int control_only, int from_where,
7747     struct timeval *now, int *now_filled, int frag_point, int so_locked
7748 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7749     SCTP_UNUSED
7750 #endif
7751 )
7752 {
7753         /**
7754          * Ok this is the generic chunk service queue. we must do the
7755          * following: - Service the stream queue that is next, moving any
7756          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7757          * LAST to the out queue in one pass) and assigning TSN's - Check to
7758          * see if the cwnd/rwnd allows any output, if so we go ahead and
7759          * fomulate and send the low level chunks. Making sure to combine
7760          * any control in the control chunk queue also.
7761          */
7762         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7763         struct mbuf *outchain, *endoutchain;
7764         struct sctp_tmit_chunk *chk, *nchk;
7765
7766         /* temp arrays for unlinking */
7767         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7768         int no_fragmentflg, error;
7769         unsigned int max_rwnd_per_dest, max_send_per_dest;
7770         int one_chunk, hbflag, skip_data_for_this_net;
7771         int asconf, cookie, no_out_cnt;
7772         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7773         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7774         int tsns_sent = 0;
7775         uint32_t auth_offset = 0;
7776         struct sctp_auth_chunk *auth = NULL;
7777         uint16_t auth_keyid;
7778         int override_ok = 1;
7779         int skip_fill_up = 0;
7780         int data_auth_reqd = 0;
7781
7782         /*
7783          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7784          * destination.
7785          */
7786         int quit_now = 0;
7787
7788         *num_out = 0;
7789         auth_keyid = stcb->asoc.authinfo.active_keyid;
7790
7791         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7792             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7793             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7794                 eeor_mode = 1;
7795         } else {
7796                 eeor_mode = 0;
7797         }
7798         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7799         /*
7800          * First lets prime the pump. For each destination, if there is room
7801          * in the flight size, attempt to pull an MTU's worth out of the
7802          * stream queues into the general send_queue
7803          */
7804 #ifdef SCTP_AUDITING_ENABLED
7805         sctp_audit_log(0xC2, 2);
7806 #endif
7807         SCTP_TCB_LOCK_ASSERT(stcb);
7808         hbflag = 0;
7809         if ((control_only) || (asoc->stream_reset_outstanding))
7810                 no_data_chunks = 1;
7811         else
7812                 no_data_chunks = 0;
7813
7814         /* Nothing to possible to send? */
7815         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7816             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7817             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7818             TAILQ_EMPTY(&asoc->send_queue) &&
7819             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7820 nothing_to_send:
7821                 *reason_code = 9;
7822                 return (0);
7823         }
7824         if (asoc->peers_rwnd == 0) {
7825                 /* No room in peers rwnd */
7826                 *reason_code = 1;
7827                 if (asoc->total_flight > 0) {
7828                         /* we are allowed one chunk in flight */
7829                         no_data_chunks = 1;
7830                 }
7831         }
7832         if (stcb->asoc.ecn_echo_cnt_onq) {
7833                 /* Record where a sack goes, if any */
7834                 if (no_data_chunks &&
7835                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7836                         /* Nothing but ECNe to send - we don't do that */
7837                         goto nothing_to_send;
7838                 }
7839                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7840                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7841                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7842                                 sack_goes_to = chk->whoTo;
7843                                 break;
7844                         }
7845                 }
7846         }
7847         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7848         if (stcb->sctp_socket)
7849                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7850         else
7851                 max_send_per_dest = 0;
7852         if (no_data_chunks == 0) {
7853                 /* How many non-directed chunks are there? */
7854                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7855                         if (chk->whoTo == NULL) {
7856                                 /*
7857                                  * We already have non-directed chunks on
7858                                  * the queue, no need to do a fill-up.
7859                                  */
7860                                 skip_fill_up = 1;
7861                                 break;
7862                         }
7863                 }
7864
7865         }
7866         if ((no_data_chunks == 0) &&
7867             (skip_fill_up == 0) &&
7868             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7869                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7870                         /*
7871                          * This for loop we are in takes in each net, if
7872                          * its's got space in cwnd and has data sent to it
7873                          * (when CMT is off) then it calls
7874                          * sctp_fill_outqueue for the net. This gets data on
7875                          * the send queue for that network.
7876                          *
7877                          * In sctp_fill_outqueue TSN's are assigned and data is
7878                          * copied out of the stream buffers. Note mostly
7879                          * copy by reference (we hope).
7880                          */
7881                         net->window_probe = 0;
7882                         if ((net != stcb->asoc.alternate) &&
7883                             ((net->dest_state & SCTP_ADDR_PF) ||
7884                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7885                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7886                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7887                                         sctp_log_cwnd(stcb, net, 1,
7888                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7889                                 }
7890                                 continue;
7891                         }
7892                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7893                             (net->flight_size == 0)) {
7894                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7895                         }
7896                         if (net->flight_size >= net->cwnd) {
7897                                 /* skip this network, no room - can't fill */
7898                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7899                                         sctp_log_cwnd(stcb, net, 3,
7900                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7901                                 }
7902                                 continue;
7903                         }
7904                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7905                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7906                         }
7907                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7908                         if (quit_now) {
7909                                 /* memory alloc failure */
7910                                 no_data_chunks = 1;
7911                                 break;
7912                         }
7913                 }
7914         }
7915         /* now service each destination and send out what we can for it */
7916         /* Nothing to send? */
7917         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7918             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7919             TAILQ_EMPTY(&asoc->send_queue)) {
7920                 *reason_code = 8;
7921                 return (0);
7922         }
7923         if (asoc->sctp_cmt_on_off > 0) {
7924                 /* get the last start point */
7925                 start_at = asoc->last_net_cmt_send_started;
7926                 if (start_at == NULL) {
7927                         /* null so to beginning */
7928                         start_at = TAILQ_FIRST(&asoc->nets);
7929                 } else {
7930                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7931                         if (start_at == NULL) {
7932                                 start_at = TAILQ_FIRST(&asoc->nets);
7933                         }
7934                 }
7935                 asoc->last_net_cmt_send_started = start_at;
7936         } else {
7937                 start_at = TAILQ_FIRST(&asoc->nets);
7938         }
7939         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7940                 if (chk->whoTo == NULL) {
7941                         if (asoc->alternate) {
7942                                 chk->whoTo = asoc->alternate;
7943                         } else {
7944                                 chk->whoTo = asoc->primary_destination;
7945                         }
7946                         atomic_add_int(&chk->whoTo->ref_count, 1);
7947                 }
7948         }
7949         old_start_at = NULL;
7950 again_one_more_time:
7951         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7952                 /* how much can we send? */
7953                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7954                 if (old_start_at && (old_start_at == net)) {
7955                         /* through list ocmpletely. */
7956                         break;
7957                 }
7958                 tsns_sent = 0xa;
7959                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7960                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7961                     (net->flight_size >= net->cwnd)) {
7962                         /*
7963                          * Nothing on control or asconf and flight is full,
7964                          * we can skip even in the CMT case.
7965                          */
7966                         continue;
7967                 }
7968                 bundle_at = 0;
7969                 endoutchain = outchain = NULL;
7970                 no_fragmentflg = 1;
7971                 one_chunk = 0;
7972                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7973                         skip_data_for_this_net = 1;
7974                 } else {
7975                         skip_data_for_this_net = 0;
7976                 }
7977                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7978                         /*
7979                          * if we have a route and an ifp check to see if we
7980                          * have room to send to this guy
7981                          */
7982                         struct ifnet *ifp;
7983
7984                         ifp = net->ro.ro_rt->rt_ifp;
7985                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7986                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7987                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7988                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7989                                 }
7990                                 continue;
7991                         }
7992                 }
7993                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7994 #ifdef INET
7995                 case AF_INET:
7996                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7997                         break;
7998 #endif
7999 #ifdef INET6
8000                 case AF_INET6:
8001                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8002                         break;
8003 #endif
8004                 default:
8005                         /* TSNH */
8006                         mtu = net->mtu;
8007                         break;
8008                 }
8009                 mx_mtu = mtu;
8010                 to_out = 0;
8011                 if (mtu > asoc->peers_rwnd) {
8012                         if (asoc->total_flight > 0) {
8013                                 /* We have a packet in flight somewhere */
8014                                 r_mtu = asoc->peers_rwnd;
8015                         } else {
8016                                 /* We are always allowed to send one MTU out */
8017                                 one_chunk = 1;
8018                                 r_mtu = mtu;
8019                         }
8020                 } else {
8021                         r_mtu = mtu;
8022                 }
8023                 /************************/
8024                 /* ASCONF transmission */
8025                 /************************/
8026                 /* Now first lets go through the asconf queue */
8027                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8028                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8029                                 continue;
8030                         }
8031                         if (chk->whoTo == NULL) {
8032                                 if (asoc->alternate == NULL) {
8033                                         if (asoc->primary_destination != net) {
8034                                                 break;
8035                                         }
8036                                 } else {
8037                                         if (asoc->alternate != net) {
8038                                                 break;
8039                                         }
8040                                 }
8041                         } else {
8042                                 if (chk->whoTo != net) {
8043                                         break;
8044                                 }
8045                         }
8046                         if (chk->data == NULL) {
8047                                 break;
8048                         }
8049                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8050                             chk->sent != SCTP_DATAGRAM_RESEND) {
8051                                 break;
8052                         }
8053                         /*
8054                          * if no AUTH is yet included and this chunk
8055                          * requires it, make sure to account for it.  We
8056                          * don't apply the size until the AUTH chunk is
8057                          * actually added below in case there is no room for
8058                          * this chunk. NOTE: we overload the use of "omtu"
8059                          * here
8060                          */
8061                         if ((auth == NULL) &&
8062                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8063                             stcb->asoc.peer_auth_chunks)) {
8064                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8065                         } else
8066                                 omtu = 0;
8067                         /* Here we do NOT factor the r_mtu */
8068                         if ((chk->send_size < (int)(mtu - omtu)) ||
8069                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8070                                 /*
8071                                  * We probably should glom the mbuf chain
8072                                  * from the chk->data for control but the
8073                                  * problem is it becomes yet one more level
8074                                  * of tracking to do if for some reason
8075                                  * output fails. Then I have got to
8076                                  * reconstruct the merged control chain.. el
8077                                  * yucko.. for now we take the easy way and
8078                                  * do the copy
8079                                  */
8080                                 /*
8081                                  * Add an AUTH chunk, if chunk requires it
8082                                  * save the offset into the chain for AUTH
8083                                  */
8084                                 if ((auth == NULL) &&
8085                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8086                                     stcb->asoc.peer_auth_chunks))) {
8087                                         outchain = sctp_add_auth_chunk(outchain,
8088                                             &endoutchain,
8089                                             &auth,
8090                                             &auth_offset,
8091                                             stcb,
8092                                             chk->rec.chunk_id.id);
8093                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8094                                 }
8095                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8096                                     (int)chk->rec.chunk_id.can_take_data,
8097                                     chk->send_size, chk->copy_by_ref);
8098                                 if (outchain == NULL) {
8099                                         *reason_code = 8;
8100                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8101                                         return (ENOMEM);
8102                                 }
8103                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8104                                 /* update our MTU size */
8105                                 if (mtu > (chk->send_size + omtu))
8106                                         mtu -= (chk->send_size + omtu);
8107                                 else
8108                                         mtu = 0;
8109                                 to_out += (chk->send_size + omtu);
8110                                 /* Do clear IP_DF ? */
8111                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8112                                         no_fragmentflg = 0;
8113                                 }
8114                                 if (chk->rec.chunk_id.can_take_data)
8115                                         chk->data = NULL;
8116                                 /*
8117                                  * set hb flag since we can use these for
8118                                  * RTO
8119                                  */
8120                                 hbflag = 1;
8121                                 asconf = 1;
8122                                 /*
8123                                  * should sysctl this: don't bundle data
8124                                  * with ASCONF since it requires AUTH
8125                                  */
8126                                 no_data_chunks = 1;
8127                                 chk->sent = SCTP_DATAGRAM_SENT;
8128                                 if (chk->whoTo == NULL) {
8129                                         chk->whoTo = net;
8130                                         atomic_add_int(&net->ref_count, 1);
8131                                 }
8132                                 chk->snd_count++;
8133                                 if (mtu == 0) {
8134                                         /*
8135                                          * Ok we are out of room but we can
8136                                          * output without effecting the
8137                                          * flight size since this little guy
8138                                          * is a control only packet.
8139                                          */
8140                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8141                                         /*
8142                                          * do NOT clear the asconf flag as
8143                                          * it is used to do appropriate
8144                                          * source address selection.
8145                                          */
8146                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8147                                             (struct sockaddr *)&net->ro._l_addr,
8148                                             outchain, auth_offset, auth,
8149                                             stcb->asoc.authinfo.active_keyid,
8150                                             no_fragmentflg, 0, asconf,
8151                                             inp->sctp_lport, stcb->rport,
8152                                             htonl(stcb->asoc.peer_vtag),
8153                                             net->port, NULL,
8154                                             0, 0,
8155                                             so_locked))) {
8156                                                 if (error == ENOBUFS) {
8157                                                         asoc->ifp_had_enobuf = 1;
8158                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8159                                                 }
8160                                                 if (from_where == 0) {
8161                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8162                                                 }
8163                                                 if (*now_filled == 0) {
8164                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8165                                                         *now_filled = 1;
8166                                                         *now = net->last_sent_time;
8167                                                 } else {
8168                                                         net->last_sent_time = *now;
8169                                                 }
8170                                                 hbflag = 0;
8171                                                 /* error, could not output */
8172                                                 if (error == EHOSTUNREACH) {
8173                                                         /*
8174                                                          * Destination went
8175                                                          * unreachable
8176                                                          * during this send
8177                                                          */
8178                                                         sctp_move_chunks_from_net(stcb, net);
8179                                                 }
8180                                                 *reason_code = 7;
8181                                                 continue;
8182                                         } else
8183                                                 asoc->ifp_had_enobuf = 0;
8184                                         if (*now_filled == 0) {
8185                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8186                                                 *now_filled = 1;
8187                                                 *now = net->last_sent_time;
8188                                         } else {
8189                                                 net->last_sent_time = *now;
8190                                         }
8191                                         hbflag = 0;
8192                                         /*
8193                                          * increase the number we sent, if a
8194                                          * cookie is sent we don't tell them
8195                                          * any was sent out.
8196                                          */
8197                                         outchain = endoutchain = NULL;
8198                                         auth = NULL;
8199                                         auth_offset = 0;
8200                                         if (!no_out_cnt)
8201                                                 *num_out += ctl_cnt;
8202                                         /* recalc a clean slate and setup */
8203                                         switch (net->ro._l_addr.sa.sa_family) {
8204 #ifdef INET
8205                                         case AF_INET:
8206                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8207                                                 break;
8208 #endif
8209 #ifdef INET6
8210                                         case AF_INET6:
8211                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8212                                                 break;
8213 #endif
8214                                         default:
8215                                                 /* TSNH */
8216                                                 mtu = net->mtu;
8217                                                 break;
8218                                         }
8219                                         to_out = 0;
8220                                         no_fragmentflg = 1;
8221                                 }
8222                         }
8223                 }
8224                 /************************/
8225                 /* Control transmission */
8226                 /************************/
8227                 /* Now first lets go through the control queue */
8228                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8229                         if ((sack_goes_to) &&
8230                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8231                             (chk->whoTo != sack_goes_to)) {
8232                                 /*
8233                                  * if we have a sack in queue, and we are
8234                                  * looking at an ecn echo that is NOT queued
8235                                  * to where the sack is going..
8236                                  */
8237                                 if (chk->whoTo == net) {
8238                                         /*
8239                                          * Don't transmit it to where its
8240                                          * going (current net)
8241                                          */
8242                                         continue;
8243                                 } else if (sack_goes_to == net) {
8244                                         /*
8245                                          * But do transmit it to this
8246                                          * address
8247                                          */
8248                                         goto skip_net_check;
8249                                 }
8250                         }
8251                         if (chk->whoTo == NULL) {
8252                                 if (asoc->alternate == NULL) {
8253                                         if (asoc->primary_destination != net) {
8254                                                 continue;
8255                                         }
8256                                 } else {
8257                                         if (asoc->alternate != net) {
8258                                                 continue;
8259                                         }
8260                                 }
8261                         } else {
8262                                 if (chk->whoTo != net) {
8263                                         continue;
8264                                 }
8265                         }
8266         skip_net_check:
8267                         if (chk->data == NULL) {
8268                                 continue;
8269                         }
8270                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8271                                 /*
8272                                  * It must be unsent. Cookies and ASCONF's
8273                                  * hang around but there timers will force
8274                                  * when marked for resend.
8275                                  */
8276                                 continue;
8277                         }
8278                         /*
8279                          * if no AUTH is yet included and this chunk
8280                          * requires it, make sure to account for it.  We
8281                          * don't apply the size until the AUTH chunk is
8282                          * actually added below in case there is no room for
8283                          * this chunk. NOTE: we overload the use of "omtu"
8284                          * here
8285                          */
8286                         if ((auth == NULL) &&
8287                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8288                             stcb->asoc.peer_auth_chunks)) {
8289                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8290                         } else
8291                                 omtu = 0;
8292                         /* Here we do NOT factor the r_mtu */
8293                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8294                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8295                                 /*
8296                                  * We probably should glom the mbuf chain
8297                                  * from the chk->data for control but the
8298                                  * problem is it becomes yet one more level
8299                                  * of tracking to do if for some reason
8300                                  * output fails. Then I have got to
8301                                  * reconstruct the merged control chain.. el
8302                                  * yucko.. for now we take the easy way and
8303                                  * do the copy
8304                                  */
8305                                 /*
8306                                  * Add an AUTH chunk, if chunk requires it
8307                                  * save the offset into the chain for AUTH
8308                                  */
8309                                 if ((auth == NULL) &&
8310                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8311                                     stcb->asoc.peer_auth_chunks))) {
8312                                         outchain = sctp_add_auth_chunk(outchain,
8313                                             &endoutchain,
8314                                             &auth,
8315                                             &auth_offset,
8316                                             stcb,
8317                                             chk->rec.chunk_id.id);
8318                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8319                                 }
8320                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8321                                     (int)chk->rec.chunk_id.can_take_data,
8322                                     chk->send_size, chk->copy_by_ref);
8323                                 if (outchain == NULL) {
8324                                         *reason_code = 8;
8325                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8326                                         return (ENOMEM);
8327                                 }
8328                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8329                                 /* update our MTU size */
8330                                 if (mtu > (chk->send_size + omtu))
8331                                         mtu -= (chk->send_size + omtu);
8332                                 else
8333                                         mtu = 0;
8334                                 to_out += (chk->send_size + omtu);
8335                                 /* Do clear IP_DF ? */
8336                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8337                                         no_fragmentflg = 0;
8338                                 }
8339                                 if (chk->rec.chunk_id.can_take_data)
8340                                         chk->data = NULL;
8341                                 /* Mark things to be removed, if needed */
8342                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8343                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8344                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8345                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8346                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8347                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8348                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8349                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8350                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8351                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8352                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8353                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8354                                                 hbflag = 1;
8355                                         }
8356                                         /* remove these chunks at the end */
8357                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8358                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8359                                                 /* turn off the timer */
8360                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8361                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8362                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8363                                                 }
8364                                         }
8365                                         ctl_cnt++;
8366                                 } else {
8367                                         /*
8368                                          * Other chunks, since they have
8369                                          * timers running (i.e. COOKIE) we
8370                                          * just "trust" that it gets sent or
8371                                          * retransmitted.
8372                                          */
8373                                         ctl_cnt++;
8374                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8375                                                 cookie = 1;
8376                                                 no_out_cnt = 1;
8377                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8378                                                 /*
8379                                                  * Increment ecne send count
8380                                                  * here this means we may be
8381                                                  * over-zealous in our
8382                                                  * counting if the send
8383                                                  * fails, but its the best
8384                                                  * place to do it (we used
8385                                                  * to do it in the queue of
8386                                                  * the chunk, but that did
8387                                                  * not tell how many times
8388                                                  * it was sent.
8389                                                  */
8390                                                 SCTP_STAT_INCR(sctps_sendecne);
8391                                         }
8392                                         chk->sent = SCTP_DATAGRAM_SENT;
8393                                         if (chk->whoTo == NULL) {
8394                                                 chk->whoTo = net;
8395                                                 atomic_add_int(&net->ref_count, 1);
8396                                         }
8397                                         chk->snd_count++;
8398                                 }
8399                                 if (mtu == 0) {
8400                                         /*
8401                                          * Ok we are out of room but we can
8402                                          * output without effecting the
8403                                          * flight size since this little guy
8404                                          * is a control only packet.
8405                                          */
8406                                         if (asconf) {
8407                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8408                                                 /*
8409                                                  * do NOT clear the asconf
8410                                                  * flag as it is used to do
8411                                                  * appropriate source
8412                                                  * address selection.
8413                                                  */
8414                                         }
8415                                         if (cookie) {
8416                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8417                                                 cookie = 0;
8418                                         }
8419                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8420                                             (struct sockaddr *)&net->ro._l_addr,
8421                                             outchain,
8422                                             auth_offset, auth,
8423                                             stcb->asoc.authinfo.active_keyid,
8424                                             no_fragmentflg, 0, asconf,
8425                                             inp->sctp_lport, stcb->rport,
8426                                             htonl(stcb->asoc.peer_vtag),
8427                                             net->port, NULL,
8428                                             0, 0,
8429                                             so_locked))) {
8430                                                 if (error == ENOBUFS) {
8431                                                         asoc->ifp_had_enobuf = 1;
8432                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8433                                                 }
8434                                                 if (from_where == 0) {
8435                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8436                                                 }
8437                                                 /* error, could not output */
8438                                                 if (hbflag) {
8439                                                         if (*now_filled == 0) {
8440                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8441                                                                 *now_filled = 1;
8442                                                                 *now = net->last_sent_time;
8443                                                         } else {
8444                                                                 net->last_sent_time = *now;
8445                                                         }
8446                                                         hbflag = 0;
8447                                                 }
8448                                                 if (error == EHOSTUNREACH) {
8449                                                         /*
8450                                                          * Destination went
8451                                                          * unreachable
8452                                                          * during this send
8453                                                          */
8454                                                         sctp_move_chunks_from_net(stcb, net);
8455                                                 }
8456                                                 *reason_code = 7;
8457                                                 continue;
8458                                         } else
8459                                                 asoc->ifp_had_enobuf = 0;
8460                                         /* Only HB or ASCONF advances time */
8461                                         if (hbflag) {
8462                                                 if (*now_filled == 0) {
8463                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8464                                                         *now_filled = 1;
8465                                                         *now = net->last_sent_time;
8466                                                 } else {
8467                                                         net->last_sent_time = *now;
8468                                                 }
8469                                                 hbflag = 0;
8470                                         }
8471                                         /*
8472                                          * increase the number we sent, if a
8473                                          * cookie is sent we don't tell them
8474                                          * any was sent out.
8475                                          */
8476                                         outchain = endoutchain = NULL;
8477                                         auth = NULL;
8478                                         auth_offset = 0;
8479                                         if (!no_out_cnt)
8480                                                 *num_out += ctl_cnt;
8481                                         /* recalc a clean slate and setup */
8482                                         switch (net->ro._l_addr.sa.sa_family) {
8483 #ifdef INET
8484                                         case AF_INET:
8485                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8486                                                 break;
8487 #endif
8488 #ifdef INET6
8489                                         case AF_INET6:
8490                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8491                                                 break;
8492 #endif
8493                                         default:
8494                                                 /* TSNH */
8495                                                 mtu = net->mtu;
8496                                                 break;
8497                                         }
8498                                         to_out = 0;
8499                                         no_fragmentflg = 1;
8500                                 }
8501                         }
8502                 }
8503                 /* JRI: if dest is in PF state, do not send data to it */
8504                 if ((asoc->sctp_cmt_on_off > 0) &&
8505                     (net != stcb->asoc.alternate) &&
8506                     (net->dest_state & SCTP_ADDR_PF)) {
8507                         goto no_data_fill;
8508                 }
8509                 if (net->flight_size >= net->cwnd) {
8510                         goto no_data_fill;
8511                 }
8512                 if ((asoc->sctp_cmt_on_off > 0) &&
8513                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8514                     (net->flight_size > max_rwnd_per_dest)) {
8515                         goto no_data_fill;
8516                 }
8517                 /*
8518                  * We need a specific accounting for the usage of the send
8519                  * buffer. We also need to check the number of messages per
8520                  * net. For now, this is better than nothing and it disabled
8521                  * by default...
8522                  */
8523                 if ((asoc->sctp_cmt_on_off > 0) &&
8524                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8525                     (max_send_per_dest > 0) &&
8526                     (net->flight_size > max_send_per_dest)) {
8527                         goto no_data_fill;
8528                 }
8529                 /*********************/
8530                 /* Data transmission */
8531                 /*********************/
8532                 /*
8533                  * if AUTH for DATA is required and no AUTH has been added
8534                  * yet, account for this in the mtu now... if no data can be
8535                  * bundled, this adjustment won't matter anyways since the
8536                  * packet will be going out...
8537                  */
8538                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8539                     stcb->asoc.peer_auth_chunks);
8540                 if (data_auth_reqd && (auth == NULL)) {
8541                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8542                 }
8543                 /* now lets add any data within the MTU constraints */
8544                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8545 #ifdef INET
8546                 case AF_INET:
8547                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8548                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8549                         else
8550                                 omtu = 0;
8551                         break;
8552 #endif
8553 #ifdef INET6
8554                 case AF_INET6:
8555                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8556                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8557                         else
8558                                 omtu = 0;
8559                         break;
8560 #endif
8561                 default:
8562                         /* TSNH */
8563                         omtu = 0;
8564                         break;
8565                 }
8566                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8567                     (skip_data_for_this_net == 0)) ||
8568                     (cookie)) {
8569                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8570                                 if (no_data_chunks) {
8571                                         /* let only control go out */
8572                                         *reason_code = 1;
8573                                         break;
8574                                 }
8575                                 if (net->flight_size >= net->cwnd) {
8576                                         /* skip this net, no room for data */
8577                                         *reason_code = 2;
8578                                         break;
8579                                 }
8580                                 if ((chk->whoTo != NULL) &&
8581                                     (chk->whoTo != net)) {
8582                                         /* Don't send the chunk on this net */
8583                                         continue;
8584                                 }
8585                                 if (asoc->sctp_cmt_on_off == 0) {
8586                                         if ((asoc->alternate) &&
8587                                             (asoc->alternate != net) &&
8588                                             (chk->whoTo == NULL)) {
8589                                                 continue;
8590                                         } else if ((net != asoc->primary_destination) &&
8591                                                     (asoc->alternate == NULL) &&
8592                                             (chk->whoTo == NULL)) {
8593                                                 continue;
8594                                         }
8595                                 }
8596                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8597                                         /*-
8598                                          * strange, we have a chunk that is
8599                                          * to big for its destination and
8600                                          * yet no fragment ok flag.
8601                                          * Something went wrong when the
8602                                          * PMTU changed...we did not mark
8603                                          * this chunk for some reason?? I
8604                                          * will fix it here by letting IP
8605                                          * fragment it for now and printing
8606                                          * a warning. This really should not
8607                                          * happen ...
8608                                          */
8609                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8610                                             chk->send_size, mtu);
8611                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8612                                 }
8613                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8614                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8615                                         struct sctp_data_chunk *dchkh;
8616
8617                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8618                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8619                                 }
8620                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8621                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8622                                         /* ok we will add this one */
8623
8624                                         /*
8625                                          * Add an AUTH chunk, if chunk
8626                                          * requires it, save the offset into
8627                                          * the chain for AUTH
8628                                          */
8629                                         if (data_auth_reqd) {
8630                                                 if (auth == NULL) {
8631                                                         outchain = sctp_add_auth_chunk(outchain,
8632                                                             &endoutchain,
8633                                                             &auth,
8634                                                             &auth_offset,
8635                                                             stcb,
8636                                                             SCTP_DATA);
8637                                                         auth_keyid = chk->auth_keyid;
8638                                                         override_ok = 0;
8639                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8640                                                 } else if (override_ok) {
8641                                                         /*
8642                                                          * use this data's
8643                                                          * keyid
8644                                                          */
8645                                                         auth_keyid = chk->auth_keyid;
8646                                                         override_ok = 0;
8647                                                 } else if (auth_keyid != chk->auth_keyid) {
8648                                                         /*
8649                                                          * different keyid,
8650                                                          * so done bundling
8651                                                          */
8652                                                         break;
8653                                                 }
8654                                         }
8655                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8656                                             chk->send_size, chk->copy_by_ref);
8657                                         if (outchain == NULL) {
8658                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8659                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8660                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8661                                                 }
8662                                                 *reason_code = 3;
8663                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8664                                                 return (ENOMEM);
8665                                         }
8666                                         /* upate our MTU size */
8667                                         /* Do clear IP_DF ? */
8668                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8669                                                 no_fragmentflg = 0;
8670                                         }
8671                                         /* unsigned subtraction of mtu */
8672                                         if (mtu > chk->send_size)
8673                                                 mtu -= chk->send_size;
8674                                         else
8675                                                 mtu = 0;
8676                                         /* unsigned subtraction of r_mtu */
8677                                         if (r_mtu > chk->send_size)
8678                                                 r_mtu -= chk->send_size;
8679                                         else
8680                                                 r_mtu = 0;
8681
8682                                         to_out += chk->send_size;
8683                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8684 #ifdef INVARIANTS
8685                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8686 #else
8687                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8688                                                     mx_mtu, to_out);
8689 #endif
8690                                         }
8691                                         chk->window_probe = 0;
8692                                         data_list[bundle_at++] = chk;
8693                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8694                                                 break;
8695                                         }
8696                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8697                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8698                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8699                                                 } else {
8700                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8701                                                 }
8702                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8703                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8704                                                         /*
8705                                                          * Count number of
8706                                                          * user msg's that
8707                                                          * were fragmented
8708                                                          * we do this by
8709                                                          * counting when we
8710                                                          * see a LAST
8711                                                          * fragment only.
8712                                                          */
8713                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8714                                         }
8715                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8716                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8717                                                         data_list[0]->window_probe = 1;
8718                                                         net->window_probe = 1;
8719                                                 }
8720                                                 break;
8721                                         }
8722                                 } else {
8723                                         /*
8724                                          * Must be sent in order of the
8725                                          * TSN's (on a network)
8726                                          */
8727                                         break;
8728                                 }
8729                         }       /* for (chunk gather loop for this net) */
8730                 }               /* if asoc.state OPEN */
8731 no_data_fill:
8732                 /* Is there something to send for this destination? */
8733                 if (outchain) {
8734                         /* We may need to start a control timer or two */
8735                         if (asconf) {
8736                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8737                                     stcb, net);
8738                                 /*
8739                                  * do NOT clear the asconf flag as it is
8740                                  * used to do appropriate source address
8741                                  * selection.
8742                                  */
8743                         }
8744                         if (cookie) {
8745                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8746                                 cookie = 0;
8747                         }
8748                         /* must start a send timer if data is being sent */
8749                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8750                                 /*
8751                                  * no timer running on this destination
8752                                  * restart it.
8753                                  */
8754                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8755                         }
8756                         /* Now send it, if there is anything to send :> */
8757                         if ((error = sctp_lowlevel_chunk_output(inp,
8758                             stcb,
8759                             net,
8760                             (struct sockaddr *)&net->ro._l_addr,
8761                             outchain,
8762                             auth_offset,
8763                             auth,
8764                             auth_keyid,
8765                             no_fragmentflg,
8766                             bundle_at,
8767                             asconf,
8768                             inp->sctp_lport, stcb->rport,
8769                             htonl(stcb->asoc.peer_vtag),
8770                             net->port, NULL,
8771                             0, 0,
8772                             so_locked))) {
8773                                 /* error, we could not output */
8774                                 if (error == ENOBUFS) {
8775                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8776                                         asoc->ifp_had_enobuf = 1;
8777                                 }
8778                                 if (from_where == 0) {
8779                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8780                                 }
8781                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8782                                 if (hbflag) {
8783                                         if (*now_filled == 0) {
8784                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8785                                                 *now_filled = 1;
8786                                                 *now = net->last_sent_time;
8787                                         } else {
8788                                                 net->last_sent_time = *now;
8789                                         }
8790                                         hbflag = 0;
8791                                 }
8792                                 if (error == EHOSTUNREACH) {
8793                                         /*
8794                                          * Destination went unreachable
8795                                          * during this send
8796                                          */
8797                                         sctp_move_chunks_from_net(stcb, net);
8798                                 }
8799                                 *reason_code = 6;
8800                                 /*-
8801                                  * I add this line to be paranoid. As far as
8802                                  * I can tell the continue, takes us back to
8803                                  * the top of the for, but just to make sure
8804                                  * I will reset these again here.
8805                                  */
8806                                 ctl_cnt = bundle_at = 0;
8807                                 continue;       /* This takes us back to the
8808                                                  * for() for the nets. */
8809                         } else {
8810                                 asoc->ifp_had_enobuf = 0;
8811                         }
8812                         endoutchain = NULL;
8813                         auth = NULL;
8814                         auth_offset = 0;
8815                         if (bundle_at || hbflag) {
8816                                 /* For data/asconf and hb set time */
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                         }
8825                         if (!no_out_cnt) {
8826                                 *num_out += (ctl_cnt + bundle_at);
8827                         }
8828                         if (bundle_at) {
8829                                 /* setup for a RTO measurement */
8830                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8831                                 /* fill time if not already filled */
8832                                 if (*now_filled == 0) {
8833                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8834                                         *now_filled = 1;
8835                                         *now = asoc->time_last_sent;
8836                                 } else {
8837                                         asoc->time_last_sent = *now;
8838                                 }
8839                                 if (net->rto_needed) {
8840                                         data_list[0]->do_rtt = 1;
8841                                         net->rto_needed = 0;
8842                                 }
8843                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8844                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8845                         }
8846                         if (one_chunk) {
8847                                 break;
8848                         }
8849                 }
8850                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8851                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8852                 }
8853         }
8854         if (old_start_at == NULL) {
8855                 old_start_at = start_at;
8856                 start_at = TAILQ_FIRST(&asoc->nets);
8857                 if (old_start_at)
8858                         goto again_one_more_time;
8859         }
8860         /*
8861          * At the end there should be no NON timed chunks hanging on this
8862          * queue.
8863          */
8864         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8865                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8866         }
8867         if ((*num_out == 0) && (*reason_code == 0)) {
8868                 *reason_code = 4;
8869         } else {
8870                 *reason_code = 5;
8871         }
8872         sctp_clean_up_ctl(stcb, asoc, so_locked);
8873         return (0);
8874 }
8875
8876 void
8877 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8878 {
8879         /*-
8880          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8881          * the control chunk queue.
8882          */
8883         struct sctp_chunkhdr *hdr;
8884         struct sctp_tmit_chunk *chk;
8885         struct mbuf *mat;
8886
8887         SCTP_TCB_LOCK_ASSERT(stcb);
8888         sctp_alloc_a_chunk(stcb, chk);
8889         if (chk == NULL) {
8890                 /* no memory */
8891                 sctp_m_freem(op_err);
8892                 return;
8893         }
8894         chk->copy_by_ref = 0;
8895         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8896         if (op_err == NULL) {
8897                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8898                 return;
8899         }
8900         chk->send_size = 0;
8901         mat = op_err;
8902         while (mat != NULL) {
8903                 chk->send_size += SCTP_BUF_LEN(mat);
8904                 mat = SCTP_BUF_NEXT(mat);
8905         }
8906         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8907         chk->rec.chunk_id.can_take_data = 1;
8908         chk->sent = SCTP_DATAGRAM_UNSENT;
8909         chk->snd_count = 0;
8910         chk->flags = 0;
8911         chk->asoc = &stcb->asoc;
8912         chk->data = op_err;
8913         chk->whoTo = NULL;
8914         hdr = mtod(op_err, struct sctp_chunkhdr *);
8915         hdr->chunk_type = SCTP_OPERATION_ERROR;
8916         hdr->chunk_flags = 0;
8917         hdr->chunk_length = htons(chk->send_size);
8918         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8919             chk,
8920             sctp_next);
8921         chk->asoc->ctrl_queue_cnt++;
8922 }
8923
8924 int
8925 sctp_send_cookie_echo(struct mbuf *m,
8926     int offset,
8927     struct sctp_tcb *stcb,
8928     struct sctp_nets *net)
8929 {
8930         /*-
8931          * pull out the cookie and put it at the front of the control chunk
8932          * queue.
8933          */
8934         int at;
8935         struct mbuf *cookie;
8936         struct sctp_paramhdr parm, *phdr;
8937         struct sctp_chunkhdr *hdr;
8938         struct sctp_tmit_chunk *chk;
8939         uint16_t ptype, plen;
8940
8941         /* First find the cookie in the param area */
8942         cookie = NULL;
8943         at = offset + sizeof(struct sctp_init_chunk);
8944
8945         SCTP_TCB_LOCK_ASSERT(stcb);
8946         do {
8947                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8948                 if (phdr == NULL) {
8949                         return (-3);
8950                 }
8951                 ptype = ntohs(phdr->param_type);
8952                 plen = ntohs(phdr->param_length);
8953                 if (ptype == SCTP_STATE_COOKIE) {
8954                         int pad;
8955
8956                         /* found the cookie */
8957                         if ((pad = (plen % 4))) {
8958                                 plen += 4 - pad;
8959                         }
8960                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
8961                         if (cookie == NULL) {
8962                                 /* No memory */
8963                                 return (-2);
8964                         }
8965 #ifdef SCTP_MBUF_LOGGING
8966                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8967                                 struct mbuf *mat;
8968
8969                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8970                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8971                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8972                                         }
8973                                 }
8974                         }
8975 #endif
8976                         break;
8977                 }
8978                 at += SCTP_SIZE32(plen);
8979         } while (phdr);
8980         if (cookie == NULL) {
8981                 /* Did not find the cookie */
8982                 return (-3);
8983         }
8984         /* ok, we got the cookie lets change it into a cookie echo chunk */
8985
8986         /* first the change from param to cookie */
8987         hdr = mtod(cookie, struct sctp_chunkhdr *);
8988         hdr->chunk_type = SCTP_COOKIE_ECHO;
8989         hdr->chunk_flags = 0;
8990         /* get the chunk stuff now and place it in the FRONT of the queue */
8991         sctp_alloc_a_chunk(stcb, chk);
8992         if (chk == NULL) {
8993                 /* no memory */
8994                 sctp_m_freem(cookie);
8995                 return (-5);
8996         }
8997         chk->copy_by_ref = 0;
8998         chk->send_size = plen;
8999         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9000         chk->rec.chunk_id.can_take_data = 0;
9001         chk->sent = SCTP_DATAGRAM_UNSENT;
9002         chk->snd_count = 0;
9003         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9004         chk->asoc = &stcb->asoc;
9005         chk->data = cookie;
9006         chk->whoTo = net;
9007         atomic_add_int(&chk->whoTo->ref_count, 1);
9008         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9009         chk->asoc->ctrl_queue_cnt++;
9010         return (0);
9011 }
9012
9013 void
9014 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9015     struct mbuf *m,
9016     int offset,
9017     int chk_length,
9018     struct sctp_nets *net)
9019 {
9020         /*
9021          * take a HB request and make it into a HB ack and send it.
9022          */
9023         struct mbuf *outchain;
9024         struct sctp_chunkhdr *chdr;
9025         struct sctp_tmit_chunk *chk;
9026
9027
9028         if (net == NULL)
9029                 /* must have a net pointer */
9030                 return;
9031
9032         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9033         if (outchain == NULL) {
9034                 /* gak out of memory */
9035                 return;
9036         }
9037 #ifdef SCTP_MBUF_LOGGING
9038         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9039                 struct mbuf *mat;
9040
9041                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9042                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9043                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9044                         }
9045                 }
9046         }
9047 #endif
9048         chdr = mtod(outchain, struct sctp_chunkhdr *);
9049         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9050         chdr->chunk_flags = 0;
9051         if (chk_length % 4) {
9052                 /* need pad */
9053                 uint32_t cpthis = 0;
9054                 int padlen;
9055
9056                 padlen = 4 - (chk_length % 4);
9057                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9058         }
9059         sctp_alloc_a_chunk(stcb, chk);
9060         if (chk == NULL) {
9061                 /* no memory */
9062                 sctp_m_freem(outchain);
9063                 return;
9064         }
9065         chk->copy_by_ref = 0;
9066         chk->send_size = chk_length;
9067         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9068         chk->rec.chunk_id.can_take_data = 1;
9069         chk->sent = SCTP_DATAGRAM_UNSENT;
9070         chk->snd_count = 0;
9071         chk->flags = 0;
9072         chk->asoc = &stcb->asoc;
9073         chk->data = outchain;
9074         chk->whoTo = net;
9075         atomic_add_int(&chk->whoTo->ref_count, 1);
9076         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9077         chk->asoc->ctrl_queue_cnt++;
9078 }
9079
9080 void
9081 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9082 {
9083         /* formulate and queue a cookie-ack back to sender */
9084         struct mbuf *cookie_ack;
9085         struct sctp_chunkhdr *hdr;
9086         struct sctp_tmit_chunk *chk;
9087
9088         SCTP_TCB_LOCK_ASSERT(stcb);
9089
9090         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9091         if (cookie_ack == NULL) {
9092                 /* no mbuf's */
9093                 return;
9094         }
9095         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9096         sctp_alloc_a_chunk(stcb, chk);
9097         if (chk == NULL) {
9098                 /* no memory */
9099                 sctp_m_freem(cookie_ack);
9100                 return;
9101         }
9102         chk->copy_by_ref = 0;
9103         chk->send_size = sizeof(struct sctp_chunkhdr);
9104         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9105         chk->rec.chunk_id.can_take_data = 1;
9106         chk->sent = SCTP_DATAGRAM_UNSENT;
9107         chk->snd_count = 0;
9108         chk->flags = 0;
9109         chk->asoc = &stcb->asoc;
9110         chk->data = cookie_ack;
9111         if (chk->asoc->last_control_chunk_from != NULL) {
9112                 chk->whoTo = chk->asoc->last_control_chunk_from;
9113                 atomic_add_int(&chk->whoTo->ref_count, 1);
9114         } else {
9115                 chk->whoTo = NULL;
9116         }
9117         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9118         hdr->chunk_type = SCTP_COOKIE_ACK;
9119         hdr->chunk_flags = 0;
9120         hdr->chunk_length = htons(chk->send_size);
9121         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9122         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9123         chk->asoc->ctrl_queue_cnt++;
9124         return;
9125 }
9126
9127
9128 void
9129 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9130 {
9131         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9132         struct mbuf *m_shutdown_ack;
9133         struct sctp_shutdown_ack_chunk *ack_cp;
9134         struct sctp_tmit_chunk *chk;
9135
9136         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9137         if (m_shutdown_ack == NULL) {
9138                 /* no mbuf's */
9139                 return;
9140         }
9141         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9142         sctp_alloc_a_chunk(stcb, chk);
9143         if (chk == NULL) {
9144                 /* no memory */
9145                 sctp_m_freem(m_shutdown_ack);
9146                 return;
9147         }
9148         chk->copy_by_ref = 0;
9149         chk->send_size = sizeof(struct sctp_chunkhdr);
9150         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9151         chk->rec.chunk_id.can_take_data = 1;
9152         chk->sent = SCTP_DATAGRAM_UNSENT;
9153         chk->snd_count = 0;
9154         chk->flags = 0;
9155         chk->asoc = &stcb->asoc;
9156         chk->data = m_shutdown_ack;
9157         chk->whoTo = net;
9158         if (chk->whoTo) {
9159                 atomic_add_int(&chk->whoTo->ref_count, 1);
9160         }
9161         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9162         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9163         ack_cp->ch.chunk_flags = 0;
9164         ack_cp->ch.chunk_length = htons(chk->send_size);
9165         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9166         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9167         chk->asoc->ctrl_queue_cnt++;
9168         return;
9169 }
9170
9171 void
9172 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9173 {
9174         /* formulate and queue a SHUTDOWN to the sender */
9175         struct mbuf *m_shutdown;
9176         struct sctp_shutdown_chunk *shutdown_cp;
9177         struct sctp_tmit_chunk *chk;
9178
9179         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9180         if (m_shutdown == NULL) {
9181                 /* no mbuf's */
9182                 return;
9183         }
9184         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9185         sctp_alloc_a_chunk(stcb, chk);
9186         if (chk == NULL) {
9187                 /* no memory */
9188                 sctp_m_freem(m_shutdown);
9189                 return;
9190         }
9191         chk->copy_by_ref = 0;
9192         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9193         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9194         chk->rec.chunk_id.can_take_data = 1;
9195         chk->sent = SCTP_DATAGRAM_UNSENT;
9196         chk->snd_count = 0;
9197         chk->flags = 0;
9198         chk->asoc = &stcb->asoc;
9199         chk->data = m_shutdown;
9200         chk->whoTo = net;
9201         if (chk->whoTo) {
9202                 atomic_add_int(&chk->whoTo->ref_count, 1);
9203         }
9204         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9205         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9206         shutdown_cp->ch.chunk_flags = 0;
9207         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9208         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9209         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9210         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9211         chk->asoc->ctrl_queue_cnt++;
9212         return;
9213 }
9214
9215 void
9216 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9217 {
9218         /*
9219          * formulate and queue an ASCONF to the peer. ASCONF parameters
9220          * should be queued on the assoc queue.
9221          */
9222         struct sctp_tmit_chunk *chk;
9223         struct mbuf *m_asconf;
9224         int len;
9225
9226         SCTP_TCB_LOCK_ASSERT(stcb);
9227
9228         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9229             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9230                 /* can't send a new one if there is one in flight already */
9231                 return;
9232         }
9233         /* compose an ASCONF chunk, maximum length is PMTU */
9234         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9235         if (m_asconf == NULL) {
9236                 return;
9237         }
9238         sctp_alloc_a_chunk(stcb, chk);
9239         if (chk == NULL) {
9240                 /* no memory */
9241                 sctp_m_freem(m_asconf);
9242                 return;
9243         }
9244         chk->copy_by_ref = 0;
9245         chk->data = m_asconf;
9246         chk->send_size = len;
9247         chk->rec.chunk_id.id = SCTP_ASCONF;
9248         chk->rec.chunk_id.can_take_data = 0;
9249         chk->sent = SCTP_DATAGRAM_UNSENT;
9250         chk->snd_count = 0;
9251         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9252         chk->asoc = &stcb->asoc;
9253         chk->whoTo = net;
9254         if (chk->whoTo) {
9255                 atomic_add_int(&chk->whoTo->ref_count, 1);
9256         }
9257         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9258         chk->asoc->ctrl_queue_cnt++;
9259         return;
9260 }
9261
9262 void
9263 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9264 {
9265         /*
9266          * formulate and queue a asconf-ack back to sender. the asconf-ack
9267          * must be stored in the tcb.
9268          */
9269         struct sctp_tmit_chunk *chk;
9270         struct sctp_asconf_ack *ack, *latest_ack;
9271         struct mbuf *m_ack;
9272         struct sctp_nets *net = NULL;
9273
9274         SCTP_TCB_LOCK_ASSERT(stcb);
9275         /* Get the latest ASCONF-ACK */
9276         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9277         if (latest_ack == NULL) {
9278                 return;
9279         }
9280         if (latest_ack->last_sent_to != NULL &&
9281             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9282                 /* we're doing a retransmission */
9283                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9284                 if (net == NULL) {
9285                         /* no alternate */
9286                         if (stcb->asoc.last_control_chunk_from == NULL) {
9287                                 if (stcb->asoc.alternate) {
9288                                         net = stcb->asoc.alternate;
9289                                 } else {
9290                                         net = stcb->asoc.primary_destination;
9291                                 }
9292                         } else {
9293                                 net = stcb->asoc.last_control_chunk_from;
9294                         }
9295                 }
9296         } else {
9297                 /* normal case */
9298                 if (stcb->asoc.last_control_chunk_from == NULL) {
9299                         if (stcb->asoc.alternate) {
9300                                 net = stcb->asoc.alternate;
9301                         } else {
9302                                 net = stcb->asoc.primary_destination;
9303                         }
9304                 } else {
9305                         net = stcb->asoc.last_control_chunk_from;
9306                 }
9307         }
9308         latest_ack->last_sent_to = net;
9309
9310         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9311                 if (ack->data == NULL) {
9312                         continue;
9313                 }
9314                 /* copy the asconf_ack */
9315                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9316                 if (m_ack == NULL) {
9317                         /* couldn't copy it */
9318                         return;
9319                 }
9320 #ifdef SCTP_MBUF_LOGGING
9321                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9322                         struct mbuf *mat;
9323
9324                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9325                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9326                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9327                                 }
9328                         }
9329                 }
9330 #endif
9331
9332                 sctp_alloc_a_chunk(stcb, chk);
9333                 if (chk == NULL) {
9334                         /* no memory */
9335                         if (m_ack)
9336                                 sctp_m_freem(m_ack);
9337                         return;
9338                 }
9339                 chk->copy_by_ref = 0;
9340
9341                 chk->whoTo = net;
9342                 if (chk->whoTo) {
9343                         atomic_add_int(&chk->whoTo->ref_count, 1);
9344                 }
9345                 chk->data = m_ack;
9346                 chk->send_size = 0;
9347                 /* Get size */
9348                 chk->send_size = ack->len;
9349                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9350                 chk->rec.chunk_id.can_take_data = 1;
9351                 chk->sent = SCTP_DATAGRAM_UNSENT;
9352                 chk->snd_count = 0;
9353                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9354                 chk->asoc = &stcb->asoc;
9355
9356                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9357                 chk->asoc->ctrl_queue_cnt++;
9358         }
9359         return;
9360 }
9361
9362
9363 static int
9364 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9365     struct sctp_tcb *stcb,
9366     struct sctp_association *asoc,
9367     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9368 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9369     SCTP_UNUSED
9370 #endif
9371 )
9372 {
9373         /*-
9374          * send out one MTU of retransmission. If fast_retransmit is
9375          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9376          * rwnd. For a Cookie or Asconf in the control chunk queue we
9377          * retransmit them by themselves.
9378          *
9379          * For data chunks we will pick out the lowest TSN's in the sent_queue
9380          * marked for resend and bundle them all together (up to a MTU of
9381          * destination). The address to send to should have been
9382          * selected/changed where the retransmission was marked (i.e. in FR
9383          * or t3-timeout routines).
9384          */
9385         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9386         struct sctp_tmit_chunk *chk, *fwd;
9387         struct mbuf *m, *endofchain;
9388         struct sctp_nets *net = NULL;
9389         uint32_t tsns_sent = 0;
9390         int no_fragmentflg, bundle_at, cnt_thru;
9391         unsigned int mtu;
9392         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9393         struct sctp_auth_chunk *auth = NULL;
9394         uint32_t auth_offset = 0;
9395         uint16_t auth_keyid;
9396         int override_ok = 1;
9397         int data_auth_reqd = 0;
9398         uint32_t dmtu = 0;
9399
9400         SCTP_TCB_LOCK_ASSERT(stcb);
9401         tmr_started = ctl_cnt = bundle_at = error = 0;
9402         no_fragmentflg = 1;
9403         fwd_tsn = 0;
9404         *cnt_out = 0;
9405         fwd = NULL;
9406         endofchain = m = NULL;
9407         auth_keyid = stcb->asoc.authinfo.active_keyid;
9408 #ifdef SCTP_AUDITING_ENABLED
9409         sctp_audit_log(0xC3, 1);
9410 #endif
9411         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9412             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9413                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9414                     asoc->sent_queue_retran_cnt);
9415                 asoc->sent_queue_cnt = 0;
9416                 asoc->sent_queue_cnt_removeable = 0;
9417                 /* send back 0/0 so we enter normal transmission */
9418                 *cnt_out = 0;
9419                 return (0);
9420         }
9421         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9422                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9423                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9424                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9425                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9426                                 continue;
9427                         }
9428                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9429                                 if (chk != asoc->str_reset) {
9430                                         /*
9431                                          * not eligible for retran if its
9432                                          * not ours
9433                                          */
9434                                         continue;
9435                                 }
9436                         }
9437                         ctl_cnt++;
9438                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9439                                 fwd_tsn = 1;
9440                         }
9441                         /*
9442                          * Add an AUTH chunk, if chunk requires it save the
9443                          * offset into the chain for AUTH
9444                          */
9445                         if ((auth == NULL) &&
9446                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9447                             stcb->asoc.peer_auth_chunks))) {
9448                                 m = sctp_add_auth_chunk(m, &endofchain,
9449                                     &auth, &auth_offset,
9450                                     stcb,
9451                                     chk->rec.chunk_id.id);
9452                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9453                         }
9454                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9455                         break;
9456                 }
9457         }
9458         one_chunk = 0;
9459         cnt_thru = 0;
9460         /* do we have control chunks to retransmit? */
9461         if (m != NULL) {
9462                 /* Start a timer no matter if we suceed or fail */
9463                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9464                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9465                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9466                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9467                 chk->snd_count++;       /* update our count */
9468                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9469                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9470                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9471                     no_fragmentflg, 0, 0,
9472                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9473                     chk->whoTo->port, NULL,
9474                     0, 0,
9475                     so_locked))) {
9476                         SCTP_STAT_INCR(sctps_lowlevelerr);
9477                         return (error);
9478                 }
9479                 endofchain = NULL;
9480                 auth = NULL;
9481                 auth_offset = 0;
9482                 /*
9483                  * We don't want to mark the net->sent time here since this
9484                  * we use this for HB and retrans cannot measure RTT
9485                  */
9486                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9487                 *cnt_out += 1;
9488                 chk->sent = SCTP_DATAGRAM_SENT;
9489                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9490                 if (fwd_tsn == 0) {
9491                         return (0);
9492                 } else {
9493                         /* Clean up the fwd-tsn list */
9494                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9495                         return (0);
9496                 }
9497         }
9498         /*
9499          * Ok, it is just data retransmission we need to do or that and a
9500          * fwd-tsn with it all.
9501          */
9502         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9503                 return (SCTP_RETRAN_DONE);
9504         }
9505         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9506             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9507                 /* not yet open, resend the cookie and that is it */
9508                 return (1);
9509         }
9510 #ifdef SCTP_AUDITING_ENABLED
9511         sctp_auditing(20, inp, stcb, NULL);
9512 #endif
9513         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9514         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9515                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9516                         /* No, not sent to this net or not ready for rtx */
9517                         continue;
9518                 }
9519                 if (chk->data == NULL) {
9520                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9521                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9522                         continue;
9523                 }
9524                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9525                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9526                         /* Gak, we have exceeded max unlucky retran, abort! */
9527                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9528                             chk->snd_count,
9529                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9530                         atomic_add_int(&stcb->asoc.refcnt, 1);
9531                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9532                         SCTP_TCB_LOCK(stcb);
9533                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9534                         return (SCTP_RETRAN_EXIT);
9535                 }
9536                 /* pick up the net */
9537                 net = chk->whoTo;
9538                 switch (net->ro._l_addr.sa.sa_family) {
9539 #ifdef INET
9540                 case AF_INET:
9541                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9542                         break;
9543 #endif
9544 #ifdef INET6
9545                 case AF_INET6:
9546                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9547                         break;
9548 #endif
9549                 default:
9550                         /* TSNH */
9551                         mtu = net->mtu;
9552                         break;
9553                 }
9554
9555                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9556                         /* No room in peers rwnd */
9557                         uint32_t tsn;
9558
9559                         tsn = asoc->last_acked_seq + 1;
9560                         if (tsn == chk->rec.data.TSN_seq) {
9561                                 /*
9562                                  * we make a special exception for this
9563                                  * case. The peer has no rwnd but is missing
9564                                  * the lowest chunk.. which is probably what
9565                                  * is holding up the rwnd.
9566                                  */
9567                                 goto one_chunk_around;
9568                         }
9569                         return (1);
9570                 }
9571 one_chunk_around:
9572                 if (asoc->peers_rwnd < mtu) {
9573                         one_chunk = 1;
9574                         if ((asoc->peers_rwnd == 0) &&
9575                             (asoc->total_flight == 0)) {
9576                                 chk->window_probe = 1;
9577                                 chk->whoTo->window_probe = 1;
9578                         }
9579                 }
9580 #ifdef SCTP_AUDITING_ENABLED
9581                 sctp_audit_log(0xC3, 2);
9582 #endif
9583                 bundle_at = 0;
9584                 m = NULL;
9585                 net->fast_retran_ip = 0;
9586                 if (chk->rec.data.doing_fast_retransmit == 0) {
9587                         /*
9588                          * if no FR in progress skip destination that have
9589                          * flight_size > cwnd.
9590                          */
9591                         if (net->flight_size >= net->cwnd) {
9592                                 continue;
9593                         }
9594                 } else {
9595                         /*
9596                          * Mark the destination net to have FR recovery
9597                          * limits put on it.
9598                          */
9599                         *fr_done = 1;
9600                         net->fast_retran_ip = 1;
9601                 }
9602
9603                 /*
9604                  * if no AUTH is yet included and this chunk requires it,
9605                  * make sure to account for it.  We don't apply the size
9606                  * until the AUTH chunk is actually added below in case
9607                  * there is no room for this chunk.
9608                  */
9609                 if (data_auth_reqd && (auth == NULL)) {
9610                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9611                 } else
9612                         dmtu = 0;
9613
9614                 if ((chk->send_size <= (mtu - dmtu)) ||
9615                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9616                         /* ok we will add this one */
9617                         if (data_auth_reqd) {
9618                                 if (auth == NULL) {
9619                                         m = sctp_add_auth_chunk(m,
9620                                             &endofchain,
9621                                             &auth,
9622                                             &auth_offset,
9623                                             stcb,
9624                                             SCTP_DATA);
9625                                         auth_keyid = chk->auth_keyid;
9626                                         override_ok = 0;
9627                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9628                                 } else if (override_ok) {
9629                                         auth_keyid = chk->auth_keyid;
9630                                         override_ok = 0;
9631                                 } else if (chk->auth_keyid != auth_keyid) {
9632                                         /* different keyid, so done bundling */
9633                                         break;
9634                                 }
9635                         }
9636                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9637                         if (m == NULL) {
9638                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9639                                 return (ENOMEM);
9640                         }
9641                         /* Do clear IP_DF ? */
9642                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9643                                 no_fragmentflg = 0;
9644                         }
9645                         /* upate our MTU size */
9646                         if (mtu > (chk->send_size + dmtu))
9647                                 mtu -= (chk->send_size + dmtu);
9648                         else
9649                                 mtu = 0;
9650                         data_list[bundle_at++] = chk;
9651                         if (one_chunk && (asoc->total_flight <= 0)) {
9652                                 SCTP_STAT_INCR(sctps_windowprobed);
9653                         }
9654                 }
9655                 if (one_chunk == 0) {
9656                         /*
9657                          * now are there anymore forward from chk to pick
9658                          * up?
9659                          */
9660                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9661                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9662                                         /* Nope, not for retran */
9663                                         continue;
9664                                 }
9665                                 if (fwd->whoTo != net) {
9666                                         /* Nope, not the net in question */
9667                                         continue;
9668                                 }
9669                                 if (data_auth_reqd && (auth == NULL)) {
9670                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9671                                 } else
9672                                         dmtu = 0;
9673                                 if (fwd->send_size <= (mtu - dmtu)) {
9674                                         if (data_auth_reqd) {
9675                                                 if (auth == NULL) {
9676                                                         m = sctp_add_auth_chunk(m,
9677                                                             &endofchain,
9678                                                             &auth,
9679                                                             &auth_offset,
9680                                                             stcb,
9681                                                             SCTP_DATA);
9682                                                         auth_keyid = fwd->auth_keyid;
9683                                                         override_ok = 0;
9684                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9685                                                 } else if (override_ok) {
9686                                                         auth_keyid = fwd->auth_keyid;
9687                                                         override_ok = 0;
9688                                                 } else if (fwd->auth_keyid != auth_keyid) {
9689                                                         /*
9690                                                          * different keyid,
9691                                                          * so done bundling
9692                                                          */
9693                                                         break;
9694                                                 }
9695                                         }
9696                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9697                                         if (m == NULL) {
9698                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9699                                                 return (ENOMEM);
9700                                         }
9701                                         /* Do clear IP_DF ? */
9702                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9703                                                 no_fragmentflg = 0;
9704                                         }
9705                                         /* upate our MTU size */
9706                                         if (mtu > (fwd->send_size + dmtu))
9707                                                 mtu -= (fwd->send_size + dmtu);
9708                                         else
9709                                                 mtu = 0;
9710                                         data_list[bundle_at++] = fwd;
9711                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9712                                                 break;
9713                                         }
9714                                 } else {
9715                                         /* can't fit so we are done */
9716                                         break;
9717                                 }
9718                         }
9719                 }
9720                 /* Is there something to send for this destination? */
9721                 if (m) {
9722                         /*
9723                          * No matter if we fail/or suceed we should start a
9724                          * timer. A failure is like a lost IP packet :-)
9725                          */
9726                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9727                                 /*
9728                                  * no timer running on this destination
9729                                  * restart it.
9730                                  */
9731                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9732                                 tmr_started = 1;
9733                         }
9734                         /* Now lets send it, if there is anything to send :> */
9735                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9736                             (struct sockaddr *)&net->ro._l_addr, m,
9737                             auth_offset, auth, auth_keyid,
9738                             no_fragmentflg, 0, 0,
9739                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9740                             net->port, NULL,
9741                             0, 0,
9742                             so_locked))) {
9743                                 /* error, we could not output */
9744                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9745                                 return (error);
9746                         }
9747                         endofchain = NULL;
9748                         auth = NULL;
9749                         auth_offset = 0;
9750                         /* For HB's */
9751                         /*
9752                          * We don't want to mark the net->sent time here
9753                          * since this we use this for HB and retrans cannot
9754                          * measure RTT
9755                          */
9756                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9757
9758                         /* For auto-close */
9759                         cnt_thru++;
9760                         if (*now_filled == 0) {
9761                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9762                                 *now = asoc->time_last_sent;
9763                                 *now_filled = 1;
9764                         } else {
9765                                 asoc->time_last_sent = *now;
9766                         }
9767                         *cnt_out += bundle_at;
9768 #ifdef SCTP_AUDITING_ENABLED
9769                         sctp_audit_log(0xC4, bundle_at);
9770 #endif
9771                         if (bundle_at) {
9772                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9773                         }
9774                         for (i = 0; i < bundle_at; i++) {
9775                                 SCTP_STAT_INCR(sctps_sendretransdata);
9776                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9777                                 /*
9778                                  * When we have a revoked data, and we
9779                                  * retransmit it, then we clear the revoked
9780                                  * flag since this flag dictates if we
9781                                  * subtracted from the fs
9782                                  */
9783                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9784                                         /* Deflate the cwnd */
9785                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9786                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9787                                 }
9788                                 data_list[i]->snd_count++;
9789                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9790                                 /* record the time */
9791                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9792                                 if (data_list[i]->book_size_scale) {
9793                                         /*
9794                                          * need to double the book size on
9795                                          * this one
9796                                          */
9797                                         data_list[i]->book_size_scale = 0;
9798                                         /*
9799                                          * Since we double the booksize, we
9800                                          * must also double the output queue
9801                                          * size, since this get shrunk when
9802                                          * we free by this amount.
9803                                          */
9804                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9805                                         data_list[i]->book_size *= 2;
9806
9807
9808                                 } else {
9809                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9810                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9811                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9812                                         }
9813                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9814                                             (uint32_t) (data_list[i]->send_size +
9815                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9816                                 }
9817                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9818                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9819                                             data_list[i]->whoTo->flight_size,
9820                                             data_list[i]->book_size,
9821                                             (uintptr_t) data_list[i]->whoTo,
9822                                             data_list[i]->rec.data.TSN_seq);
9823                                 }
9824                                 sctp_flight_size_increase(data_list[i]);
9825                                 sctp_total_flight_increase(stcb, data_list[i]);
9826                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9827                                         /* SWS sender side engages */
9828                                         asoc->peers_rwnd = 0;
9829                                 }
9830                                 if ((i == 0) &&
9831                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9832                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9833                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9834                                             (tmr_started == 0)) {
9835                                                 /*-
9836                                                  * ok we just fast-retrans'd
9837                                                  * the lowest TSN, i.e the
9838                                                  * first on the list. In
9839                                                  * this case we want to give
9840                                                  * some more time to get a
9841                                                  * SACK back without a
9842                                                  * t3-expiring.
9843                                                  */
9844                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9845                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9846                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9847                                         }
9848                                 }
9849                         }
9850                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9851                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9852                         }
9853 #ifdef SCTP_AUDITING_ENABLED
9854                         sctp_auditing(21, inp, stcb, NULL);
9855 #endif
9856                 } else {
9857                         /* None will fit */
9858                         return (1);
9859                 }
9860                 if (asoc->sent_queue_retran_cnt <= 0) {
9861                         /* all done we have no more to retran */
9862                         asoc->sent_queue_retran_cnt = 0;
9863                         break;
9864                 }
9865                 if (one_chunk) {
9866                         /* No more room in rwnd */
9867                         return (1);
9868                 }
9869                 /* stop the for loop here. we sent out a packet */
9870                 break;
9871         }
9872         return (0);
9873 }
9874
9875 static void
9876 sctp_timer_validation(struct sctp_inpcb *inp,
9877     struct sctp_tcb *stcb,
9878     struct sctp_association *asoc)
9879 {
9880         struct sctp_nets *net;
9881
9882         /* Validate that a timer is running somewhere */
9883         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9884                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9885                         /* Here is a timer */
9886                         return;
9887                 }
9888         }
9889         SCTP_TCB_LOCK_ASSERT(stcb);
9890         /* Gak, we did not have a timer somewhere */
9891         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9892         if (asoc->alternate) {
9893                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9894         } else {
9895                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9896         }
9897         return;
9898 }
9899
9900 void
9901 sctp_chunk_output(struct sctp_inpcb *inp,
9902     struct sctp_tcb *stcb,
9903     int from_where,
9904     int so_locked
9905 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9906     SCTP_UNUSED
9907 #endif
9908 )
9909 {
9910         /*-
9911          * Ok this is the generic chunk service queue. we must do the
9912          * following:
9913          * - See if there are retransmits pending, if so we must
9914          *   do these first.
9915          * - Service the stream queue that is next, moving any
9916          *   message (note I must get a complete message i.e.
9917          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9918          *   TSN's
9919          * - Check to see if the cwnd/rwnd allows any output, if so we
9920          *   go ahead and fomulate and send the low level chunks. Making sure
9921          *   to combine any control in the control chunk queue also.
9922          */
9923         struct sctp_association *asoc;
9924         struct sctp_nets *net;
9925         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9926         unsigned int burst_cnt = 0;
9927         struct timeval now;
9928         int now_filled = 0;
9929         int nagle_on;
9930         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9931         int un_sent = 0;
9932         int fr_done;
9933         unsigned int tot_frs = 0;
9934
9935         asoc = &stcb->asoc;
9936         /* The Nagle algorithm is only applied when handling a send call. */
9937         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9938                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9939                         nagle_on = 0;
9940                 } else {
9941                         nagle_on = 1;
9942                 }
9943         } else {
9944                 nagle_on = 0;
9945         }
9946         SCTP_TCB_LOCK_ASSERT(stcb);
9947
9948         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9949
9950         if ((un_sent <= 0) &&
9951             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9952             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9953             (asoc->sent_queue_retran_cnt == 0)) {
9954                 /* Nothing to do unless there is something to be sent left */
9955                 return;
9956         }
9957         /*
9958          * Do we have something to send, data or control AND a sack timer
9959          * running, if so piggy-back the sack.
9960          */
9961         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9962                 sctp_send_sack(stcb, so_locked);
9963                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9964         }
9965         while (asoc->sent_queue_retran_cnt) {
9966                 /*-
9967                  * Ok, it is retransmission time only, we send out only ONE
9968                  * packet with a single call off to the retran code.
9969                  */
9970                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9971                         /*-
9972                          * Special hook for handling cookiess discarded
9973                          * by peer that carried data. Send cookie-ack only
9974                          * and then the next call with get the retran's.
9975                          */
9976                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9977                             from_where,
9978                             &now, &now_filled, frag_point, so_locked);
9979                         return;
9980                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9981                         /* if its not from a HB then do it */
9982                         fr_done = 0;
9983                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9984                         if (fr_done) {
9985                                 tot_frs++;
9986                         }
9987                 } else {
9988                         /*
9989                          * its from any other place, we don't allow retran
9990                          * output (only control)
9991                          */
9992                         ret = 1;
9993                 }
9994                 if (ret > 0) {
9995                         /* Can't send anymore */
9996                         /*-
9997                          * now lets push out control by calling med-level
9998                          * output once. this assures that we WILL send HB's
9999                          * if queued too.
10000                          */
10001                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10002                             from_where,
10003                             &now, &now_filled, frag_point, so_locked);
10004 #ifdef SCTP_AUDITING_ENABLED
10005                         sctp_auditing(8, inp, stcb, NULL);
10006 #endif
10007                         sctp_timer_validation(inp, stcb, asoc);
10008                         return;
10009                 }
10010                 if (ret < 0) {
10011                         /*-
10012                          * The count was off.. retran is not happening so do
10013                          * the normal retransmission.
10014                          */
10015 #ifdef SCTP_AUDITING_ENABLED
10016                         sctp_auditing(9, inp, stcb, NULL);
10017 #endif
10018                         if (ret == SCTP_RETRAN_EXIT) {
10019                                 return;
10020                         }
10021                         break;
10022                 }
10023                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10024                         /* Only one transmission allowed out of a timeout */
10025 #ifdef SCTP_AUDITING_ENABLED
10026                         sctp_auditing(10, inp, stcb, NULL);
10027 #endif
10028                         /* Push out any control */
10029                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10030                             &now, &now_filled, frag_point, so_locked);
10031                         return;
10032                 }
10033                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10034                         /* Hit FR burst limit */
10035                         return;
10036                 }
10037                 if ((num_out == 0) && (ret == 0)) {
10038                         /* No more retrans to send */
10039                         break;
10040                 }
10041         }
10042 #ifdef SCTP_AUDITING_ENABLED
10043         sctp_auditing(12, inp, stcb, NULL);
10044 #endif
10045         /* Check for bad destinations, if they exist move chunks around. */
10046         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10047                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10048                         /*-
10049                          * if possible move things off of this address we
10050                          * still may send below due to the dormant state but
10051                          * we try to find an alternate address to send to
10052                          * and if we have one we move all queued data on the
10053                          * out wheel to this alternate address.
10054                          */
10055                         if (net->ref_count > 1)
10056                                 sctp_move_chunks_from_net(stcb, net);
10057                 } else {
10058                         /*-
10059                          * if ((asoc->sat_network) || (net->addr_is_local))
10060                          * { burst_limit = asoc->max_burst *
10061                          * SCTP_SAT_NETWORK_BURST_INCR; }
10062                          */
10063                         if (asoc->max_burst > 0) {
10064                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10065                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10066                                                 /*
10067                                                  * JRS - Use the congestion
10068                                                  * control given in the
10069                                                  * congestion control module
10070                                                  */
10071                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10072                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10073                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10074                                                 }
10075                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10076                                         }
10077                                         net->fast_retran_ip = 0;
10078                                 } else {
10079                                         if (net->flight_size == 0) {
10080                                                 /*
10081                                                  * Should be decaying the
10082                                                  * cwnd here
10083                                                  */
10084                                                 ;
10085                                         }
10086                                 }
10087                         }
10088                 }
10089
10090         }
10091         burst_cnt = 0;
10092         do {
10093                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10094                     &reason_code, 0, from_where,
10095                     &now, &now_filled, frag_point, so_locked);
10096                 if (error) {
10097                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10098                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10099                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10100                         }
10101                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10102                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10103                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10104                         }
10105                         break;
10106                 }
10107                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10108
10109                 tot_out += num_out;
10110                 burst_cnt++;
10111                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10112                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10113                         if (num_out == 0) {
10114                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10115                         }
10116                 }
10117                 if (nagle_on) {
10118                         /*
10119                          * When the Nagle algorithm is used, look at how
10120                          * much is unsent, then if its smaller than an MTU
10121                          * and we have data in flight we stop, except if we
10122                          * are handling a fragmented user message.
10123                          */
10124                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10125                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10126                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10127                             (stcb->asoc.total_flight > 0) &&
10128                             ((stcb->asoc.locked_on_sending == NULL) ||
10129                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10130                                 break;
10131                         }
10132                 }
10133                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10134                     TAILQ_EMPTY(&asoc->send_queue) &&
10135                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10136                         /* Nothing left to send */
10137                         break;
10138                 }
10139                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10140                         /* Nothing left to send */
10141                         break;
10142                 }
10143         } while (num_out &&
10144             ((asoc->max_burst == 0) ||
10145             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10146             (burst_cnt < asoc->max_burst)));
10147
10148         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10149                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10150                         SCTP_STAT_INCR(sctps_maxburstqueued);
10151                         asoc->burst_limit_applied = 1;
10152                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10153                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10154                         }
10155                 } else {
10156                         asoc->burst_limit_applied = 0;
10157                 }
10158         }
10159         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10160                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10161         }
10162         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10163             tot_out);
10164
10165         /*-
10166          * Now we need to clean up the control chunk chain if a ECNE is on
10167          * it. It must be marked as UNSENT again so next call will continue
10168          * to send it until such time that we get a CWR, to remove it.
10169          */
10170         if (stcb->asoc.ecn_echo_cnt_onq)
10171                 sctp_fix_ecn_echo(asoc);
10172         return;
10173 }
10174
10175
10176 int
10177 sctp_output(
10178     struct sctp_inpcb *inp,
10179     struct mbuf *m,
10180     struct sockaddr *addr,
10181     struct mbuf *control,
10182     struct thread *p,
10183     int flags)
10184 {
10185         if (inp == NULL) {
10186                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10187                 return (EINVAL);
10188         }
10189         if (inp->sctp_socket == NULL) {
10190                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10191                 return (EINVAL);
10192         }
10193         return (sctp_sosend(inp->sctp_socket,
10194             addr,
10195             (struct uio *)NULL,
10196             m,
10197             control,
10198             flags, p
10199             ));
10200 }
10201
10202 void
10203 send_forward_tsn(struct sctp_tcb *stcb,
10204     struct sctp_association *asoc)
10205 {
10206         struct sctp_tmit_chunk *chk;
10207         struct sctp_forward_tsn_chunk *fwdtsn;
10208         uint32_t advance_peer_ack_point;
10209
10210         SCTP_TCB_LOCK_ASSERT(stcb);
10211         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10212                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10213                         /* mark it to unsent */
10214                         chk->sent = SCTP_DATAGRAM_UNSENT;
10215                         chk->snd_count = 0;
10216                         /* Do we correct its output location? */
10217                         if (chk->whoTo) {
10218                                 sctp_free_remote_addr(chk->whoTo);
10219                                 chk->whoTo = NULL;
10220                         }
10221                         goto sctp_fill_in_rest;
10222                 }
10223         }
10224         /* Ok if we reach here we must build one */
10225         sctp_alloc_a_chunk(stcb, chk);
10226         if (chk == NULL) {
10227                 return;
10228         }
10229         asoc->fwd_tsn_cnt++;
10230         chk->copy_by_ref = 0;
10231         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10232         chk->rec.chunk_id.can_take_data = 0;
10233         chk->asoc = asoc;
10234         chk->whoTo = NULL;
10235         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10236         if (chk->data == NULL) {
10237                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10238                 return;
10239         }
10240         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10241         chk->sent = SCTP_DATAGRAM_UNSENT;
10242         chk->snd_count = 0;
10243         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10244         asoc->ctrl_queue_cnt++;
10245 sctp_fill_in_rest:
10246         /*-
10247          * Here we go through and fill out the part that deals with
10248          * stream/seq of the ones we skip.
10249          */
10250         SCTP_BUF_LEN(chk->data) = 0;
10251         {
10252                 struct sctp_tmit_chunk *at, *tp1, *last;
10253                 struct sctp_strseq *strseq;
10254                 unsigned int cnt_of_space, i, ovh;
10255                 unsigned int space_needed;
10256                 unsigned int cnt_of_skipped = 0;
10257
10258                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10259                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10260                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10261                                 /* no more to look at */
10262                                 break;
10263                         }
10264                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10265                                 /* We don't report these */
10266                                 continue;
10267                         }
10268                         cnt_of_skipped++;
10269                 }
10270                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10271                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10272
10273                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10274
10275                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10276                         ovh = SCTP_MIN_OVERHEAD;
10277                 } else {
10278                         ovh = SCTP_MIN_V4_OVERHEAD;
10279                 }
10280                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10281                         /* trim to a mtu size */
10282                         cnt_of_space = asoc->smallest_mtu - ovh;
10283                 }
10284                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10285                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10286                             0xff, 0, cnt_of_skipped,
10287                             asoc->advanced_peer_ack_point);
10288
10289                 }
10290                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10291                 if (cnt_of_space < space_needed) {
10292                         /*-
10293                          * ok we must trim down the chunk by lowering the
10294                          * advance peer ack point.
10295                          */
10296                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10297                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10298                                     0xff, 0xff, cnt_of_space,
10299                                     space_needed);
10300                         }
10301                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10302                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10303                         /*-
10304                          * Go through and find the TSN that will be the one
10305                          * we report.
10306                          */
10307                         at = TAILQ_FIRST(&asoc->sent_queue);
10308                         if (at != NULL) {
10309                                 for (i = 0; i < cnt_of_skipped; i++) {
10310                                         tp1 = TAILQ_NEXT(at, sctp_next);
10311                                         if (tp1 == NULL) {
10312                                                 break;
10313                                         }
10314                                         at = tp1;
10315                                 }
10316                         }
10317                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10318                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10319                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10320                                     asoc->advanced_peer_ack_point);
10321                         }
10322                         last = at;
10323                         /*-
10324                          * last now points to last one I can report, update
10325                          * peer ack point
10326                          */
10327                         if (last)
10328                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10329                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10330                             cnt_of_skipped * sizeof(struct sctp_strseq);
10331                 }
10332                 chk->send_size = space_needed;
10333                 /* Setup the chunk */
10334                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10335                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10336                 fwdtsn->ch.chunk_flags = 0;
10337                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10338                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10339                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10340                 fwdtsn++;
10341                 /*-
10342                  * Move pointer to after the fwdtsn and transfer to the
10343                  * strseq pointer.
10344                  */
10345                 strseq = (struct sctp_strseq *)fwdtsn;
10346                 /*-
10347                  * Now populate the strseq list. This is done blindly
10348                  * without pulling out duplicate stream info. This is
10349                  * inefficent but won't harm the process since the peer will
10350                  * look at these in sequence and will thus release anything.
10351                  * It could mean we exceed the PMTU and chop off some that
10352                  * we could have included.. but this is unlikely (aka 1432/4
10353                  * would mean 300+ stream seq's would have to be reported in
10354                  * one FWD-TSN. With a bit of work we can later FIX this to
10355                  * optimize and pull out duplcates.. but it does add more
10356                  * overhead. So for now... not!
10357                  */
10358                 at = TAILQ_FIRST(&asoc->sent_queue);
10359                 for (i = 0; i < cnt_of_skipped; i++) {
10360                         tp1 = TAILQ_NEXT(at, sctp_next);
10361                         if (tp1 == NULL)
10362                                 break;
10363                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10364                                 /* We don't report these */
10365                                 i--;
10366                                 at = tp1;
10367                                 continue;
10368                         }
10369                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10370                                 at->rec.data.fwd_tsn_cnt = 0;
10371                         }
10372                         strseq->stream = ntohs(at->rec.data.stream_number);
10373                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10374                         strseq++;
10375                         at = tp1;
10376                 }
10377         }
10378         return;
10379 }
10380
10381 void
10382 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10383 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10384     SCTP_UNUSED
10385 #endif
10386 )
10387 {
10388         /*-
10389          * Queue up a SACK or NR-SACK in the control queue.
10390          * We must first check to see if a SACK or NR-SACK is
10391          * somehow on the control queue.
10392          * If so, we will take and and remove the old one.
10393          */
10394         struct sctp_association *asoc;
10395         struct sctp_tmit_chunk *chk, *a_chk;
10396         struct sctp_sack_chunk *sack;
10397         struct sctp_nr_sack_chunk *nr_sack;
10398         struct sctp_gap_ack_block *gap_descriptor;
10399         struct sack_track *selector;
10400         int mergeable = 0;
10401         int offset;
10402         caddr_t limit;
10403         uint32_t *dup;
10404         int limit_reached = 0;
10405         unsigned int i, siz, j;
10406         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10407         int num_dups = 0;
10408         int space_req;
10409         uint32_t highest_tsn;
10410         uint8_t flags;
10411         uint8_t type;
10412         uint8_t tsn_map;
10413
10414         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10415             (stcb->asoc.peer_supports_nr_sack == 1)) {
10416                 type = SCTP_NR_SELECTIVE_ACK;
10417         } else {
10418                 type = SCTP_SELECTIVE_ACK;
10419         }
10420         a_chk = NULL;
10421         asoc = &stcb->asoc;
10422         SCTP_TCB_LOCK_ASSERT(stcb);
10423         if (asoc->last_data_chunk_from == NULL) {
10424                 /* Hmm we never received anything */
10425                 return;
10426         }
10427         sctp_slide_mapping_arrays(stcb);
10428         sctp_set_rwnd(stcb, asoc);
10429         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10430                 if (chk->rec.chunk_id.id == type) {
10431                         /* Hmm, found a sack already on queue, remove it */
10432                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10433                         asoc->ctrl_queue_cnt--;
10434                         a_chk = chk;
10435                         if (a_chk->data) {
10436                                 sctp_m_freem(a_chk->data);
10437                                 a_chk->data = NULL;
10438                         }
10439                         if (a_chk->whoTo) {
10440                                 sctp_free_remote_addr(a_chk->whoTo);
10441                                 a_chk->whoTo = NULL;
10442                         }
10443                         break;
10444                 }
10445         }
10446         if (a_chk == NULL) {
10447                 sctp_alloc_a_chunk(stcb, a_chk);
10448                 if (a_chk == NULL) {
10449                         /* No memory so we drop the idea, and set a timer */
10450                         if (stcb->asoc.delayed_ack) {
10451                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10452                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10453                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10454                                     stcb->sctp_ep, stcb, NULL);
10455                         } else {
10456                                 stcb->asoc.send_sack = 1;
10457                         }
10458                         return;
10459                 }
10460                 a_chk->copy_by_ref = 0;
10461                 a_chk->rec.chunk_id.id = type;
10462                 a_chk->rec.chunk_id.can_take_data = 1;
10463         }
10464         /* Clear our pkt counts */
10465         asoc->data_pkts_seen = 0;
10466
10467         a_chk->asoc = asoc;
10468         a_chk->snd_count = 0;
10469         a_chk->send_size = 0;   /* fill in later */
10470         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10471         a_chk->whoTo = NULL;
10472
10473         if ((asoc->numduptsns) ||
10474             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10475                 /*-
10476                  * Ok, we have some duplicates or the destination for the
10477                  * sack is unreachable, lets see if we can select an
10478                  * alternate than asoc->last_data_chunk_from
10479                  */
10480                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10481                     (asoc->used_alt_onsack > asoc->numnets)) {
10482                         /* We used an alt last time, don't this time */
10483                         a_chk->whoTo = NULL;
10484                 } else {
10485                         asoc->used_alt_onsack++;
10486                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10487                 }
10488                 if (a_chk->whoTo == NULL) {
10489                         /* Nope, no alternate */
10490                         a_chk->whoTo = asoc->last_data_chunk_from;
10491                         asoc->used_alt_onsack = 0;
10492                 }
10493         } else {
10494                 /*
10495                  * No duplicates so we use the last place we received data
10496                  * from.
10497                  */
10498                 asoc->used_alt_onsack = 0;
10499                 a_chk->whoTo = asoc->last_data_chunk_from;
10500         }
10501         if (a_chk->whoTo) {
10502                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10503         }
10504         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10505                 highest_tsn = asoc->highest_tsn_inside_map;
10506         } else {
10507                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10508         }
10509         if (highest_tsn == asoc->cumulative_tsn) {
10510                 /* no gaps */
10511                 if (type == SCTP_SELECTIVE_ACK) {
10512                         space_req = sizeof(struct sctp_sack_chunk);
10513                 } else {
10514                         space_req = sizeof(struct sctp_nr_sack_chunk);
10515                 }
10516         } else {
10517                 /* gaps get a cluster */
10518                 space_req = MCLBYTES;
10519         }
10520         /* Ok now lets formulate a MBUF with our sack */
10521         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10522         if ((a_chk->data == NULL) ||
10523             (a_chk->whoTo == NULL)) {
10524                 /* rats, no mbuf memory */
10525                 if (a_chk->data) {
10526                         /* was a problem with the destination */
10527                         sctp_m_freem(a_chk->data);
10528                         a_chk->data = NULL;
10529                 }
10530                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10531                 /* sa_ignore NO_NULL_CHK */
10532                 if (stcb->asoc.delayed_ack) {
10533                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10534                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10535                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10536                             stcb->sctp_ep, stcb, NULL);
10537                 } else {
10538                         stcb->asoc.send_sack = 1;
10539                 }
10540                 return;
10541         }
10542         /* ok, lets go through and fill it in */
10543         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10544         space = M_TRAILINGSPACE(a_chk->data);
10545         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10546                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10547         }
10548         limit = mtod(a_chk->data, caddr_t);
10549         limit += space;
10550
10551         flags = 0;
10552
10553         if ((asoc->sctp_cmt_on_off > 0) &&
10554             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10555                 /*-
10556                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10557                  * received, then set high bit to 1, else 0. Reset
10558                  * pkts_rcvd.
10559                  */
10560                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10561                 asoc->cmt_dac_pkts_rcvd = 0;
10562         }
10563 #ifdef SCTP_ASOCLOG_OF_TSNS
10564         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10565         stcb->asoc.cumack_log_atsnt++;
10566         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10567                 stcb->asoc.cumack_log_atsnt = 0;
10568         }
10569 #endif
10570         /* reset the readers interpretation */
10571         stcb->freed_by_sorcv_sincelast = 0;
10572
10573         if (type == SCTP_SELECTIVE_ACK) {
10574                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10575                 nr_sack = NULL;
10576                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10577                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10578                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10579                 } else {
10580                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10581                 }
10582         } else {
10583                 sack = NULL;
10584                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10585                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10586                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10587                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10588                 } else {
10589                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10590                 }
10591         }
10592
10593         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10594                 offset = 1;
10595         } else {
10596                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10597         }
10598         if (((type == SCTP_SELECTIVE_ACK) &&
10599             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10600             ((type == SCTP_NR_SELECTIVE_ACK) &&
10601             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10602                 /* we have a gap .. maybe */
10603                 for (i = 0; i < siz; i++) {
10604                         tsn_map = asoc->mapping_array[i];
10605                         if (type == SCTP_SELECTIVE_ACK) {
10606                                 tsn_map |= asoc->nr_mapping_array[i];
10607                         }
10608                         if (i == 0) {
10609                                 /*
10610                                  * Clear all bits corresponding to TSNs
10611                                  * smaller or equal to the cumulative TSN.
10612                                  */
10613                                 tsn_map &= (~0 << (1 - offset));
10614                         }
10615                         selector = &sack_array[tsn_map];
10616                         if (mergeable && selector->right_edge) {
10617                                 /*
10618                                  * Backup, left and right edges were ok to
10619                                  * merge.
10620                                  */
10621                                 num_gap_blocks--;
10622                                 gap_descriptor--;
10623                         }
10624                         if (selector->num_entries == 0)
10625                                 mergeable = 0;
10626                         else {
10627                                 for (j = 0; j < selector->num_entries; j++) {
10628                                         if (mergeable && selector->right_edge) {
10629                                                 /*
10630                                                  * do a merge by NOT setting
10631                                                  * the left side
10632                                                  */
10633                                                 mergeable = 0;
10634                                         } else {
10635                                                 /*
10636                                                  * no merge, set the left
10637                                                  * side
10638                                                  */
10639                                                 mergeable = 0;
10640                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10641                                         }
10642                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10643                                         num_gap_blocks++;
10644                                         gap_descriptor++;
10645                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10646                                                 /* no more room */
10647                                                 limit_reached = 1;
10648                                                 break;
10649                                         }
10650                                 }
10651                                 if (selector->left_edge) {
10652                                         mergeable = 1;
10653                                 }
10654                         }
10655                         if (limit_reached) {
10656                                 /* Reached the limit stop */
10657                                 break;
10658                         }
10659                         offset += 8;
10660                 }
10661         }
10662         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10663             (limit_reached == 0)) {
10664
10665                 mergeable = 0;
10666
10667                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10668                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10669                 } else {
10670                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10671                 }
10672
10673                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10674                         offset = 1;
10675                 } else {
10676                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10677                 }
10678                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10679                         /* we have a gap .. maybe */
10680                         for (i = 0; i < siz; i++) {
10681                                 tsn_map = asoc->nr_mapping_array[i];
10682                                 if (i == 0) {
10683                                         /*
10684                                          * Clear all bits corresponding to
10685                                          * TSNs smaller or equal to the
10686                                          * cumulative TSN.
10687                                          */
10688                                         tsn_map &= (~0 << (1 - offset));
10689                                 }
10690                                 selector = &sack_array[tsn_map];
10691                                 if (mergeable && selector->right_edge) {
10692                                         /*
10693                                          * Backup, left and right edges were
10694                                          * ok to merge.
10695                                          */
10696                                         num_nr_gap_blocks--;
10697                                         gap_descriptor--;
10698                                 }
10699                                 if (selector->num_entries == 0)
10700                                         mergeable = 0;
10701                                 else {
10702                                         for (j = 0; j < selector->num_entries; j++) {
10703                                                 if (mergeable && selector->right_edge) {
10704                                                         /*
10705                                                          * do a merge by NOT
10706                                                          * setting the left
10707                                                          * side
10708                                                          */
10709                                                         mergeable = 0;
10710                                                 } else {
10711                                                         /*
10712                                                          * no merge, set the
10713                                                          * left side
10714                                                          */
10715                                                         mergeable = 0;
10716                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10717                                                 }
10718                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10719                                                 num_nr_gap_blocks++;
10720                                                 gap_descriptor++;
10721                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10722                                                         /* no more room */
10723                                                         limit_reached = 1;
10724                                                         break;
10725                                                 }
10726                                         }
10727                                         if (selector->left_edge) {
10728                                                 mergeable = 1;
10729                                         }
10730                                 }
10731                                 if (limit_reached) {
10732                                         /* Reached the limit stop */
10733                                         break;
10734                                 }
10735                                 offset += 8;
10736                         }
10737                 }
10738         }
10739         /* now we must add any dups we are going to report. */
10740         if ((limit_reached == 0) && (asoc->numduptsns)) {
10741                 dup = (uint32_t *) gap_descriptor;
10742                 for (i = 0; i < asoc->numduptsns; i++) {
10743                         *dup = htonl(asoc->dup_tsns[i]);
10744                         dup++;
10745                         num_dups++;
10746                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10747                                 /* no more room */
10748                                 break;
10749                         }
10750                 }
10751                 asoc->numduptsns = 0;
10752         }
10753         /*
10754          * now that the chunk is prepared queue it to the control chunk
10755          * queue.
10756          */
10757         if (type == SCTP_SELECTIVE_ACK) {
10758                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10759                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10760                     num_dups * sizeof(int32_t);
10761                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10762                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10763                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10764                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10765                 sack->sack.num_dup_tsns = htons(num_dups);
10766                 sack->ch.chunk_type = type;
10767                 sack->ch.chunk_flags = flags;
10768                 sack->ch.chunk_length = htons(a_chk->send_size);
10769         } else {
10770                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10771                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10772                     num_dups * sizeof(int32_t);
10773                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10774                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10775                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10776                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10777                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10778                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10779                 nr_sack->nr_sack.reserved = 0;
10780                 nr_sack->ch.chunk_type = type;
10781                 nr_sack->ch.chunk_flags = flags;
10782                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10783         }
10784         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10785         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10786         asoc->ctrl_queue_cnt++;
10787         asoc->send_sack = 0;
10788         SCTP_STAT_INCR(sctps_sendsacks);
10789         return;
10790 }
10791
10792 void
10793 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10794 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10795     SCTP_UNUSED
10796 #endif
10797 )
10798 {
10799         struct mbuf *m_abort, *m, *m_last;
10800         struct mbuf *m_out, *m_end = NULL;
10801         struct sctp_abort_chunk *abort;
10802         struct sctp_auth_chunk *auth = NULL;
10803         struct sctp_nets *net;
10804         uint32_t vtag;
10805         uint32_t auth_offset = 0;
10806         uint16_t cause_len, chunk_len, padding_len;
10807
10808         SCTP_TCB_LOCK_ASSERT(stcb);
10809         /*-
10810          * Add an AUTH chunk, if chunk requires it and save the offset into
10811          * the chain for AUTH
10812          */
10813         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10814             stcb->asoc.peer_auth_chunks)) {
10815                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10816                     stcb, SCTP_ABORT_ASSOCIATION);
10817                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10818         } else {
10819                 m_out = NULL;
10820         }
10821         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10822         if (m_abort == NULL) {
10823                 if (m_out) {
10824                         sctp_m_freem(m_out);
10825                 }
10826                 if (operr) {
10827                         sctp_m_freem(operr);
10828                 }
10829                 return;
10830         }
10831         /* link in any error */
10832         SCTP_BUF_NEXT(m_abort) = operr;
10833         cause_len = 0;
10834         m_last = NULL;
10835         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10836                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10837                 if (SCTP_BUF_NEXT(m) == NULL) {
10838                         m_last = m;
10839                 }
10840         }
10841         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10842         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10843         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10844         if (m_out == NULL) {
10845                 /* NO Auth chunk prepended, so reserve space in front */
10846                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10847                 m_out = m_abort;
10848         } else {
10849                 /* Put AUTH chunk at the front of the chain */
10850                 SCTP_BUF_NEXT(m_end) = m_abort;
10851         }
10852         if (stcb->asoc.alternate) {
10853                 net = stcb->asoc.alternate;
10854         } else {
10855                 net = stcb->asoc.primary_destination;
10856         }
10857         /* Fill in the ABORT chunk header. */
10858         abort = mtod(m_abort, struct sctp_abort_chunk *);
10859         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10860         if (stcb->asoc.peer_vtag == 0) {
10861                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10862                 vtag = stcb->asoc.my_vtag;
10863                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10864         } else {
10865                 vtag = stcb->asoc.peer_vtag;
10866                 abort->ch.chunk_flags = 0;
10867         }
10868         abort->ch.chunk_length = htons(chunk_len);
10869         /* Add padding, if necessary. */
10870         if (padding_len > 0) {
10871                 if ((m_last == NULL) ||
10872                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10873                         sctp_m_freem(m_out);
10874                         return;
10875                 }
10876         }
10877         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10878             (struct sockaddr *)&net->ro._l_addr,
10879             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10880             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10881             stcb->asoc.primary_destination->port, NULL,
10882             0, 0,
10883             so_locked);
10884         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10885 }
10886
10887 void
10888 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10889     struct sctp_nets *net,
10890     int reflect_vtag)
10891 {
10892         /* formulate and SEND a SHUTDOWN-COMPLETE */
10893         struct mbuf *m_shutdown_comp;
10894         struct sctp_shutdown_complete_chunk *shutdown_complete;
10895         uint32_t vtag;
10896         uint8_t flags;
10897
10898         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10899         if (m_shutdown_comp == NULL) {
10900                 /* no mbuf's */
10901                 return;
10902         }
10903         if (reflect_vtag) {
10904                 flags = SCTP_HAD_NO_TCB;
10905                 vtag = stcb->asoc.my_vtag;
10906         } else {
10907                 flags = 0;
10908                 vtag = stcb->asoc.peer_vtag;
10909         }
10910         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10911         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10912         shutdown_complete->ch.chunk_flags = flags;
10913         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10914         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10915         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10916             (struct sockaddr *)&net->ro._l_addr,
10917             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10918             stcb->sctp_ep->sctp_lport, stcb->rport,
10919             htonl(vtag),
10920             net->port, NULL,
10921             0, 0,
10922             SCTP_SO_NOT_LOCKED);
10923         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10924         return;
10925 }
10926
10927 static void
10928 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10929     struct sctphdr *sh, uint32_t vtag,
10930     uint8_t type, struct mbuf *cause,
10931     uint8_t use_mflowid, uint32_t mflowid,
10932     uint32_t vrf_id, uint16_t port)
10933 {
10934         struct mbuf *o_pak;
10935         struct mbuf *mout;
10936         struct sctphdr *shout;
10937         struct sctp_chunkhdr *ch;
10938
10939 #if defined(INET) || defined(INET6)
10940         struct udphdr *udp;
10941         int ret;
10942
10943 #endif
10944         int len, cause_len, padding_len;
10945
10946 #ifdef INET
10947         struct sockaddr_in *src_sin, *dst_sin;
10948         struct ip *ip;
10949
10950 #endif
10951 #ifdef INET6
10952         struct sockaddr_in6 *src_sin6, *dst_sin6;
10953         struct ip6_hdr *ip6;
10954
10955 #endif
10956
10957         /* Compute the length of the cause and add final padding. */
10958         cause_len = 0;
10959         if (cause != NULL) {
10960                 struct mbuf *m_at, *m_last = NULL;
10961
10962                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10963                         if (SCTP_BUF_NEXT(m_at) == NULL)
10964                                 m_last = m_at;
10965                         cause_len += SCTP_BUF_LEN(m_at);
10966                 }
10967                 padding_len = cause_len % 4;
10968                 if (padding_len != 0) {
10969                         padding_len = 4 - padding_len;
10970                 }
10971                 if (padding_len != 0) {
10972                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10973                                 sctp_m_freem(cause);
10974                                 return;
10975                         }
10976                 }
10977         } else {
10978                 padding_len = 0;
10979         }
10980         /* Get an mbuf for the header. */
10981         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10982         switch (dst->sa_family) {
10983 #ifdef INET
10984         case AF_INET:
10985                 len += sizeof(struct ip);
10986                 break;
10987 #endif
10988 #ifdef INET6
10989         case AF_INET6:
10990                 len += sizeof(struct ip6_hdr);
10991                 break;
10992 #endif
10993         default:
10994                 break;
10995         }
10996 #if defined(INET) || defined(INET6)
10997         if (port) {
10998                 len += sizeof(struct udphdr);
10999         }
11000 #endif
11001         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11002         if (mout == NULL) {
11003                 if (cause) {
11004                         sctp_m_freem(cause);
11005                 }
11006                 return;
11007         }
11008         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11009         SCTP_BUF_LEN(mout) = len;
11010         SCTP_BUF_NEXT(mout) = cause;
11011         if (use_mflowid != 0) {
11012                 mout->m_pkthdr.flowid = mflowid;
11013                 mout->m_flags |= M_FLOWID;
11014         }
11015 #ifdef INET
11016         ip = NULL;
11017 #endif
11018 #ifdef INET6
11019         ip6 = NULL;
11020 #endif
11021         switch (dst->sa_family) {
11022 #ifdef INET
11023         case AF_INET:
11024                 src_sin = (struct sockaddr_in *)src;
11025                 dst_sin = (struct sockaddr_in *)dst;
11026                 ip = mtod(mout, struct ip *);
11027                 ip->ip_v = IPVERSION;
11028                 ip->ip_hl = (sizeof(struct ip) >> 2);
11029                 ip->ip_tos = 0;
11030                 ip->ip_id = ip_newid();
11031                 ip->ip_off = 0;
11032                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11033                 if (port) {
11034                         ip->ip_p = IPPROTO_UDP;
11035                 } else {
11036                         ip->ip_p = IPPROTO_SCTP;
11037                 }
11038                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11039                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11040                 ip->ip_sum = 0;
11041                 len = sizeof(struct ip);
11042                 shout = (struct sctphdr *)((caddr_t)ip + len);
11043                 break;
11044 #endif
11045 #ifdef INET6
11046         case AF_INET6:
11047                 src_sin6 = (struct sockaddr_in6 *)src;
11048                 dst_sin6 = (struct sockaddr_in6 *)dst;
11049                 ip6 = mtod(mout, struct ip6_hdr *);
11050                 ip6->ip6_flow = htonl(0x60000000);
11051                 if (V_ip6_auto_flowlabel) {
11052                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11053                 }
11054                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11055                 if (port) {
11056                         ip6->ip6_nxt = IPPROTO_UDP;
11057                 } else {
11058                         ip6->ip6_nxt = IPPROTO_SCTP;
11059                 }
11060                 ip6->ip6_src = dst_sin6->sin6_addr;
11061                 ip6->ip6_dst = src_sin6->sin6_addr;
11062                 len = sizeof(struct ip6_hdr);
11063                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11064                 break;
11065 #endif
11066         default:
11067                 len = 0;
11068                 shout = mtod(mout, struct sctphdr *);
11069                 break;
11070         }
11071 #if defined(INET) || defined(INET6)
11072         if (port) {
11073                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11074                         sctp_m_freem(mout);
11075                         return;
11076                 }
11077                 udp = (struct udphdr *)shout;
11078                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11079                 udp->uh_dport = port;
11080                 udp->uh_sum = 0;
11081                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11082                     sizeof(struct sctphdr) +
11083                     sizeof(struct sctp_chunkhdr) +
11084                     cause_len + padding_len);
11085                 len += sizeof(struct udphdr);
11086                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11087         } else {
11088                 udp = NULL;
11089         }
11090 #endif
11091         shout->src_port = sh->dest_port;
11092         shout->dest_port = sh->src_port;
11093         shout->checksum = 0;
11094         if (vtag) {
11095                 shout->v_tag = htonl(vtag);
11096         } else {
11097                 shout->v_tag = sh->v_tag;
11098         }
11099         len += sizeof(struct sctphdr);
11100         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11101         ch->chunk_type = type;
11102         if (vtag) {
11103                 ch->chunk_flags = 0;
11104         } else {
11105                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11106         }
11107         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11108         len += sizeof(struct sctp_chunkhdr);
11109         len += cause_len + padding_len;
11110
11111         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11112                 sctp_m_freem(mout);
11113                 return;
11114         }
11115         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11116         switch (dst->sa_family) {
11117 #ifdef INET
11118         case AF_INET:
11119                 if (port) {
11120                         if (V_udp_cksum) {
11121                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11122                         } else {
11123                                 udp->uh_sum = 0;
11124                         }
11125                 }
11126                 ip->ip_len = htons(len);
11127                 if (port) {
11128 #if defined(SCTP_WITH_NO_CSUM)
11129                         SCTP_STAT_INCR(sctps_sendnocrc);
11130 #else
11131                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11132                         SCTP_STAT_INCR(sctps_sendswcrc);
11133 #endif
11134                         if (V_udp_cksum) {
11135                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11136                         }
11137                 } else {
11138 #if defined(SCTP_WITH_NO_CSUM)
11139                         SCTP_STAT_INCR(sctps_sendnocrc);
11140 #else
11141                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11142                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11143                         SCTP_STAT_INCR(sctps_sendhwcrc);
11144 #endif
11145                 }
11146 #ifdef SCTP_PACKET_LOGGING
11147                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11148                         sctp_packet_log(o_pak);
11149                 }
11150 #endif
11151                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11152                 break;
11153 #endif
11154 #ifdef INET6
11155         case AF_INET6:
11156                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11157                 if (port) {
11158 #if defined(SCTP_WITH_NO_CSUM)
11159                         SCTP_STAT_INCR(sctps_sendnocrc);
11160 #else
11161                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11162                         SCTP_STAT_INCR(sctps_sendswcrc);
11163 #endif
11164                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11165                                 udp->uh_sum = 0xffff;
11166                         }
11167                 } else {
11168 #if defined(SCTP_WITH_NO_CSUM)
11169                         SCTP_STAT_INCR(sctps_sendnocrc);
11170 #else
11171                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11172                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11173                         SCTP_STAT_INCR(sctps_sendhwcrc);
11174 #endif
11175                 }
11176 #ifdef SCTP_PACKET_LOGGING
11177                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11178                         sctp_packet_log(o_pak);
11179                 }
11180 #endif
11181                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11182                 break;
11183 #endif
11184         default:
11185                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11186                     dst->sa_family);
11187                 sctp_m_freem(mout);
11188                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11189                 return;
11190         }
11191         SCTP_STAT_INCR(sctps_sendpackets);
11192         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11193         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11194         return;
11195 }
11196
11197 void
11198 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11199     struct sctphdr *sh,
11200     uint8_t use_mflowid, uint32_t mflowid,
11201     uint32_t vrf_id, uint16_t port)
11202 {
11203         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11204             use_mflowid, mflowid,
11205             vrf_id, port);
11206 }
11207
11208 void
11209 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11210 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11211     SCTP_UNUSED
11212 #endif
11213 )
11214 {
11215         struct sctp_tmit_chunk *chk;
11216         struct sctp_heartbeat_chunk *hb;
11217         struct timeval now;
11218
11219         SCTP_TCB_LOCK_ASSERT(stcb);
11220         if (net == NULL) {
11221                 return;
11222         }
11223         (void)SCTP_GETTIME_TIMEVAL(&now);
11224         switch (net->ro._l_addr.sa.sa_family) {
11225 #ifdef INET
11226         case AF_INET:
11227                 break;
11228 #endif
11229 #ifdef INET6
11230         case AF_INET6:
11231                 break;
11232 #endif
11233         default:
11234                 return;
11235         }
11236         sctp_alloc_a_chunk(stcb, chk);
11237         if (chk == NULL) {
11238                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11239                 return;
11240         }
11241         chk->copy_by_ref = 0;
11242         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11243         chk->rec.chunk_id.can_take_data = 1;
11244         chk->asoc = &stcb->asoc;
11245         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11246
11247         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11248         if (chk->data == NULL) {
11249                 sctp_free_a_chunk(stcb, chk, so_locked);
11250                 return;
11251         }
11252         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11253         SCTP_BUF_LEN(chk->data) = chk->send_size;
11254         chk->sent = SCTP_DATAGRAM_UNSENT;
11255         chk->snd_count = 0;
11256         chk->whoTo = net;
11257         atomic_add_int(&chk->whoTo->ref_count, 1);
11258         /* Now we have a mbuf that we can fill in with the details */
11259         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11260         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11261         /* fill out chunk header */
11262         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11263         hb->ch.chunk_flags = 0;
11264         hb->ch.chunk_length = htons(chk->send_size);
11265         /* Fill out hb parameter */
11266         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11267         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11268         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11269         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11270         /* Did our user request this one, put it in */
11271         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11272         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11273         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11274                 /*
11275                  * we only take from the entropy pool if the address is not
11276                  * confirmed.
11277                  */
11278                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11279                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11280         } else {
11281                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11282                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11283         }
11284         switch (net->ro._l_addr.sa.sa_family) {
11285 #ifdef INET
11286         case AF_INET:
11287                 memcpy(hb->heartbeat.hb_info.address,
11288                     &net->ro._l_addr.sin.sin_addr,
11289                     sizeof(net->ro._l_addr.sin.sin_addr));
11290                 break;
11291 #endif
11292 #ifdef INET6
11293         case AF_INET6:
11294                 memcpy(hb->heartbeat.hb_info.address,
11295                     &net->ro._l_addr.sin6.sin6_addr,
11296                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11297                 break;
11298 #endif
11299         default:
11300                 return;
11301                 break;
11302         }
11303         net->hb_responded = 0;
11304         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11305         stcb->asoc.ctrl_queue_cnt++;
11306         SCTP_STAT_INCR(sctps_sendheartbeat);
11307         return;
11308 }
11309
11310 void
11311 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11312     uint32_t high_tsn)
11313 {
11314         struct sctp_association *asoc;
11315         struct sctp_ecne_chunk *ecne;
11316         struct sctp_tmit_chunk *chk;
11317
11318         if (net == NULL) {
11319                 return;
11320         }
11321         asoc = &stcb->asoc;
11322         SCTP_TCB_LOCK_ASSERT(stcb);
11323         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11324                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11325                         /* found a previous ECN_ECHO update it if needed */
11326                         uint32_t cnt, ctsn;
11327
11328                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11329                         ctsn = ntohl(ecne->tsn);
11330                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11331                                 ecne->tsn = htonl(high_tsn);
11332                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11333                         }
11334                         cnt = ntohl(ecne->num_pkts_since_cwr);
11335                         cnt++;
11336                         ecne->num_pkts_since_cwr = htonl(cnt);
11337                         return;
11338                 }
11339         }
11340         /* nope could not find one to update so we must build one */
11341         sctp_alloc_a_chunk(stcb, chk);
11342         if (chk == NULL) {
11343                 return;
11344         }
11345         chk->copy_by_ref = 0;
11346         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11347         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11348         chk->rec.chunk_id.can_take_data = 0;
11349         chk->asoc = &stcb->asoc;
11350         chk->send_size = sizeof(struct sctp_ecne_chunk);
11351         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11352         if (chk->data == NULL) {
11353                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11354                 return;
11355         }
11356         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11357         SCTP_BUF_LEN(chk->data) = chk->send_size;
11358         chk->sent = SCTP_DATAGRAM_UNSENT;
11359         chk->snd_count = 0;
11360         chk->whoTo = net;
11361         atomic_add_int(&chk->whoTo->ref_count, 1);
11362
11363         stcb->asoc.ecn_echo_cnt_onq++;
11364         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11365         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11366         ecne->ch.chunk_flags = 0;
11367         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11368         ecne->tsn = htonl(high_tsn);
11369         ecne->num_pkts_since_cwr = htonl(1);
11370         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11371         asoc->ctrl_queue_cnt++;
11372 }
11373
11374 void
11375 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11376     struct mbuf *m, int len, int iphlen, int bad_crc)
11377 {
11378         struct sctp_association *asoc;
11379         struct sctp_pktdrop_chunk *drp;
11380         struct sctp_tmit_chunk *chk;
11381         uint8_t *datap;
11382         int was_trunc = 0;
11383         int fullsz = 0;
11384         long spc;
11385         int offset;
11386         struct sctp_chunkhdr *ch, chunk_buf;
11387         unsigned int chk_length;
11388
11389         if (!stcb) {
11390                 return;
11391         }
11392         asoc = &stcb->asoc;
11393         SCTP_TCB_LOCK_ASSERT(stcb);
11394         if (asoc->peer_supports_pktdrop == 0) {
11395                 /*-
11396                  * peer must declare support before I send one.
11397                  */
11398                 return;
11399         }
11400         if (stcb->sctp_socket == NULL) {
11401                 return;
11402         }
11403         sctp_alloc_a_chunk(stcb, chk);
11404         if (chk == NULL) {
11405                 return;
11406         }
11407         chk->copy_by_ref = 0;
11408         len -= iphlen;
11409         chk->send_size = len;
11410         /* Validate that we do not have an ABORT in here. */
11411         offset = iphlen + sizeof(struct sctphdr);
11412         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11413             sizeof(*ch), (uint8_t *) & chunk_buf);
11414         while (ch != NULL) {
11415                 chk_length = ntohs(ch->chunk_length);
11416                 if (chk_length < sizeof(*ch)) {
11417                         /* break to abort land */
11418                         break;
11419                 }
11420                 switch (ch->chunk_type) {
11421                 case SCTP_PACKET_DROPPED:
11422                 case SCTP_ABORT_ASSOCIATION:
11423                 case SCTP_INITIATION_ACK:
11424                         /**
11425                          * We don't respond with an PKT-DROP to an ABORT
11426                          * or PKT-DROP. We also do not respond to an
11427                          * INIT-ACK, because we can't know if the initiation
11428                          * tag is correct or not.
11429                          */
11430                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11431                         return;
11432                 default:
11433                         break;
11434                 }
11435                 offset += SCTP_SIZE32(chk_length);
11436                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11437                     sizeof(*ch), (uint8_t *) & chunk_buf);
11438         }
11439
11440         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11441             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11442                 /*
11443                  * only send 1 mtu worth, trim off the excess on the end.
11444                  */
11445                 fullsz = len;
11446                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11447                 was_trunc = 1;
11448         }
11449         chk->asoc = &stcb->asoc;
11450         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11451         if (chk->data == NULL) {
11452 jump_out:
11453                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11454                 return;
11455         }
11456         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11457         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11458         if (drp == NULL) {
11459                 sctp_m_freem(chk->data);
11460                 chk->data = NULL;
11461                 goto jump_out;
11462         }
11463         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11464             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11465         chk->book_size_scale = 0;
11466         if (was_trunc) {
11467                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11468                 drp->trunc_len = htons(fullsz);
11469                 /*
11470                  * Len is already adjusted to size minus overhead above take
11471                  * out the pkt_drop chunk itself from it.
11472                  */
11473                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11474                 len = chk->send_size;
11475         } else {
11476                 /* no truncation needed */
11477                 drp->ch.chunk_flags = 0;
11478                 drp->trunc_len = htons(0);
11479         }
11480         if (bad_crc) {
11481                 drp->ch.chunk_flags |= SCTP_BADCRC;
11482         }
11483         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11484         SCTP_BUF_LEN(chk->data) = chk->send_size;
11485         chk->sent = SCTP_DATAGRAM_UNSENT;
11486         chk->snd_count = 0;
11487         if (net) {
11488                 /* we should hit here */
11489                 chk->whoTo = net;
11490                 atomic_add_int(&chk->whoTo->ref_count, 1);
11491         } else {
11492                 chk->whoTo = NULL;
11493         }
11494         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11495         chk->rec.chunk_id.can_take_data = 1;
11496         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11497         drp->ch.chunk_length = htons(chk->send_size);
11498         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11499         if (spc < 0) {
11500                 spc = 0;
11501         }
11502         drp->bottle_bw = htonl(spc);
11503         if (asoc->my_rwnd) {
11504                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11505                     asoc->size_on_all_streams +
11506                     asoc->my_rwnd_control_len +
11507                     stcb->sctp_socket->so_rcv.sb_cc);
11508         } else {
11509                 /*-
11510                  * If my rwnd is 0, possibly from mbuf depletion as well as
11511                  * space used, tell the peer there is NO space aka onq == bw
11512                  */
11513                 drp->current_onq = htonl(spc);
11514         }
11515         drp->reserved = 0;
11516         datap = drp->data;
11517         m_copydata(m, iphlen, len, (caddr_t)datap);
11518         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11519         asoc->ctrl_queue_cnt++;
11520 }
11521
11522 void
11523 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11524 {
11525         struct sctp_association *asoc;
11526         struct sctp_cwr_chunk *cwr;
11527         struct sctp_tmit_chunk *chk;
11528
11529         SCTP_TCB_LOCK_ASSERT(stcb);
11530         if (net == NULL) {
11531                 return;
11532         }
11533         asoc = &stcb->asoc;
11534         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11535                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11536                         /*
11537                          * found a previous CWR queued to same destination
11538                          * update it if needed
11539                          */
11540                         uint32_t ctsn;
11541
11542                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11543                         ctsn = ntohl(cwr->tsn);
11544                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11545                                 cwr->tsn = htonl(high_tsn);
11546                         }
11547                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11548                                 /* Make sure override is carried */
11549                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11550                         }
11551                         return;
11552                 }
11553         }
11554         sctp_alloc_a_chunk(stcb, chk);
11555         if (chk == NULL) {
11556                 return;
11557         }
11558         chk->copy_by_ref = 0;
11559         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11560         chk->rec.chunk_id.can_take_data = 1;
11561         chk->asoc = &stcb->asoc;
11562         chk->send_size = sizeof(struct sctp_cwr_chunk);
11563         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11564         if (chk->data == NULL) {
11565                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11566                 return;
11567         }
11568         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11569         SCTP_BUF_LEN(chk->data) = chk->send_size;
11570         chk->sent = SCTP_DATAGRAM_UNSENT;
11571         chk->snd_count = 0;
11572         chk->whoTo = net;
11573         atomic_add_int(&chk->whoTo->ref_count, 1);
11574         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11575         cwr->ch.chunk_type = SCTP_ECN_CWR;
11576         cwr->ch.chunk_flags = override;
11577         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11578         cwr->tsn = htonl(high_tsn);
11579         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11580         asoc->ctrl_queue_cnt++;
11581 }
11582
11583 void
11584 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11585     int number_entries, uint16_t * list,
11586     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11587 {
11588         uint16_t len, old_len, i;
11589         struct sctp_stream_reset_out_request *req_out;
11590         struct sctp_chunkhdr *ch;
11591
11592         ch = mtod(chk->data, struct sctp_chunkhdr *);
11593         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11594
11595         /* get to new offset for the param. */
11596         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11597         /* now how long will this param be? */
11598         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11599         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11600         req_out->ph.param_length = htons(len);
11601         req_out->request_seq = htonl(seq);
11602         req_out->response_seq = htonl(resp_seq);
11603         req_out->send_reset_at_tsn = htonl(last_sent);
11604         if (number_entries) {
11605                 for (i = 0; i < number_entries; i++) {
11606                         req_out->list_of_streams[i] = htons(list[i]);
11607                 }
11608         }
11609         if (SCTP_SIZE32(len) > len) {
11610                 /*-
11611                  * Need to worry about the pad we may end up adding to the
11612                  * end. This is easy since the struct is either aligned to 4
11613                  * bytes or 2 bytes off.
11614                  */
11615                 req_out->list_of_streams[number_entries] = 0;
11616         }
11617         /* now fix the chunk length */
11618         ch->chunk_length = htons(len + old_len);
11619         chk->book_size = len + old_len;
11620         chk->book_size_scale = 0;
11621         chk->send_size = SCTP_SIZE32(chk->book_size);
11622         SCTP_BUF_LEN(chk->data) = chk->send_size;
11623         return;
11624 }
11625
11626 static void
11627 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11628     int number_entries, uint16_t * list,
11629     uint32_t seq)
11630 {
11631         uint16_t len, old_len, i;
11632         struct sctp_stream_reset_in_request *req_in;
11633         struct sctp_chunkhdr *ch;
11634
11635         ch = mtod(chk->data, struct sctp_chunkhdr *);
11636         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11637
11638         /* get to new offset for the param. */
11639         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11640         /* now how long will this param be? */
11641         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11642         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11643         req_in->ph.param_length = htons(len);
11644         req_in->request_seq = htonl(seq);
11645         if (number_entries) {
11646                 for (i = 0; i < number_entries; i++) {
11647                         req_in->list_of_streams[i] = htons(list[i]);
11648                 }
11649         }
11650         if (SCTP_SIZE32(len) > len) {
11651                 /*-
11652                  * Need to worry about the pad we may end up adding to the
11653                  * end. This is easy since the struct is either aligned to 4
11654                  * bytes or 2 bytes off.
11655                  */
11656                 req_in->list_of_streams[number_entries] = 0;
11657         }
11658         /* now fix the chunk length */
11659         ch->chunk_length = htons(len + old_len);
11660         chk->book_size = len + old_len;
11661         chk->book_size_scale = 0;
11662         chk->send_size = SCTP_SIZE32(chk->book_size);
11663         SCTP_BUF_LEN(chk->data) = chk->send_size;
11664         return;
11665 }
11666
11667 static void
11668 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11669     uint32_t seq)
11670 {
11671         uint16_t len, old_len;
11672         struct sctp_stream_reset_tsn_request *req_tsn;
11673         struct sctp_chunkhdr *ch;
11674
11675         ch = mtod(chk->data, struct sctp_chunkhdr *);
11676         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11677
11678         /* get to new offset for the param. */
11679         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11680         /* now how long will this param be? */
11681         len = sizeof(struct sctp_stream_reset_tsn_request);
11682         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11683         req_tsn->ph.param_length = htons(len);
11684         req_tsn->request_seq = htonl(seq);
11685
11686         /* now fix the chunk length */
11687         ch->chunk_length = htons(len + old_len);
11688         chk->send_size = len + old_len;
11689         chk->book_size = SCTP_SIZE32(chk->send_size);
11690         chk->book_size_scale = 0;
11691         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11692         return;
11693 }
11694
11695 void
11696 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11697     uint32_t resp_seq, uint32_t result)
11698 {
11699         uint16_t len, old_len;
11700         struct sctp_stream_reset_response *resp;
11701         struct sctp_chunkhdr *ch;
11702
11703         ch = mtod(chk->data, struct sctp_chunkhdr *);
11704         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11705
11706         /* get to new offset for the param. */
11707         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11708         /* now how long will this param be? */
11709         len = sizeof(struct sctp_stream_reset_response);
11710         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11711         resp->ph.param_length = htons(len);
11712         resp->response_seq = htonl(resp_seq);
11713         resp->result = ntohl(result);
11714
11715         /* now fix the chunk length */
11716         ch->chunk_length = htons(len + old_len);
11717         chk->book_size = len + old_len;
11718         chk->book_size_scale = 0;
11719         chk->send_size = SCTP_SIZE32(chk->book_size);
11720         SCTP_BUF_LEN(chk->data) = chk->send_size;
11721         return;
11722 }
11723
11724 void
11725 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11726     uint32_t resp_seq, uint32_t result,
11727     uint32_t send_una, uint32_t recv_next)
11728 {
11729         uint16_t len, old_len;
11730         struct sctp_stream_reset_response_tsn *resp;
11731         struct sctp_chunkhdr *ch;
11732
11733         ch = mtod(chk->data, struct sctp_chunkhdr *);
11734         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11735
11736         /* get to new offset for the param. */
11737         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11738         /* now how long will this param be? */
11739         len = sizeof(struct sctp_stream_reset_response_tsn);
11740         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11741         resp->ph.param_length = htons(len);
11742         resp->response_seq = htonl(resp_seq);
11743         resp->result = htonl(result);
11744         resp->senders_next_tsn = htonl(send_una);
11745         resp->receivers_next_tsn = htonl(recv_next);
11746
11747         /* now fix the chunk length */
11748         ch->chunk_length = htons(len + old_len);
11749         chk->book_size = len + old_len;
11750         chk->send_size = SCTP_SIZE32(chk->book_size);
11751         chk->book_size_scale = 0;
11752         SCTP_BUF_LEN(chk->data) = chk->send_size;
11753         return;
11754 }
11755
11756 static void
11757 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11758     uint32_t seq,
11759     uint16_t adding)
11760 {
11761         uint16_t len, old_len;
11762         struct sctp_chunkhdr *ch;
11763         struct sctp_stream_reset_add_strm *addstr;
11764
11765         ch = mtod(chk->data, struct sctp_chunkhdr *);
11766         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11767
11768         /* get to new offset for the param. */
11769         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11770         /* now how long will this param be? */
11771         len = sizeof(struct sctp_stream_reset_add_strm);
11772
11773         /* Fill it out. */
11774         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11775         addstr->ph.param_length = htons(len);
11776         addstr->request_seq = htonl(seq);
11777         addstr->number_of_streams = htons(adding);
11778         addstr->reserved = 0;
11779
11780         /* now fix the chunk length */
11781         ch->chunk_length = htons(len + old_len);
11782         chk->send_size = len + old_len;
11783         chk->book_size = SCTP_SIZE32(chk->send_size);
11784         chk->book_size_scale = 0;
11785         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11786         return;
11787 }
11788
11789 static void
11790 sctp_add_an_in_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         /* Fill it out. */
11806         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11807         addstr->ph.param_length = htons(len);
11808         addstr->request_seq = htonl(seq);
11809         addstr->number_of_streams = htons(adding);
11810         addstr->reserved = 0;
11811
11812         /* now fix the chunk length */
11813         ch->chunk_length = htons(len + old_len);
11814         chk->send_size = len + old_len;
11815         chk->book_size = SCTP_SIZE32(chk->send_size);
11816         chk->book_size_scale = 0;
11817         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11818         return;
11819 }
11820
11821 int
11822 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11823     int number_entries, uint16_t * list,
11824     uint8_t send_out_req,
11825     uint8_t send_in_req,
11826     uint8_t send_tsn_req,
11827     uint8_t add_stream,
11828     uint16_t adding_o,
11829     uint16_t adding_i, uint8_t peer_asked)
11830 {
11831
11832         struct sctp_association *asoc;
11833         struct sctp_tmit_chunk *chk;
11834         struct sctp_chunkhdr *ch;
11835         uint32_t seq;
11836
11837         asoc = &stcb->asoc;
11838         if (asoc->stream_reset_outstanding) {
11839                 /*-
11840                  * Already one pending, must get ACK back to clear the flag.
11841                  */
11842                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11843                 return (EBUSY);
11844         }
11845         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11846             (add_stream == 0)) {
11847                 /* nothing to do */
11848                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11849                 return (EINVAL);
11850         }
11851         if (send_tsn_req && (send_out_req || send_in_req)) {
11852                 /* error, can't do that */
11853                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11854                 return (EINVAL);
11855         }
11856         sctp_alloc_a_chunk(stcb, chk);
11857         if (chk == NULL) {
11858                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11859                 return (ENOMEM);
11860         }
11861         chk->copy_by_ref = 0;
11862         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11863         chk->rec.chunk_id.can_take_data = 0;
11864         chk->asoc = &stcb->asoc;
11865         chk->book_size = sizeof(struct sctp_chunkhdr);
11866         chk->send_size = SCTP_SIZE32(chk->book_size);
11867         chk->book_size_scale = 0;
11868
11869         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11870         if (chk->data == NULL) {
11871                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11872                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11873                 return (ENOMEM);
11874         }
11875         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11876
11877         /* setup chunk parameters */
11878         chk->sent = SCTP_DATAGRAM_UNSENT;
11879         chk->snd_count = 0;
11880         if (stcb->asoc.alternate) {
11881                 chk->whoTo = stcb->asoc.alternate;
11882         } else {
11883                 chk->whoTo = stcb->asoc.primary_destination;
11884         }
11885         atomic_add_int(&chk->whoTo->ref_count, 1);
11886         ch = mtod(chk->data, struct sctp_chunkhdr *);
11887         ch->chunk_type = SCTP_STREAM_RESET;
11888         ch->chunk_flags = 0;
11889         ch->chunk_length = htons(chk->book_size);
11890         SCTP_BUF_LEN(chk->data) = chk->send_size;
11891
11892         seq = stcb->asoc.str_reset_seq_out;
11893         if (send_out_req) {
11894                 sctp_add_stream_reset_out(chk, number_entries, list,
11895                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11896                 asoc->stream_reset_out_is_outstanding = 1;
11897                 seq++;
11898                 asoc->stream_reset_outstanding++;
11899         }
11900         if ((add_stream & 1) &&
11901             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11902                 /* Need to allocate more */
11903                 struct sctp_stream_out *oldstream;
11904                 struct sctp_stream_queue_pending *sp, *nsp;
11905                 int i;
11906
11907                 oldstream = stcb->asoc.strmout;
11908                 /* get some more */
11909                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11910                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11911                     SCTP_M_STRMO);
11912                 if (stcb->asoc.strmout == NULL) {
11913                         uint8_t x;
11914
11915                         stcb->asoc.strmout = oldstream;
11916                         /* Turn off the bit */
11917                         x = add_stream & 0xfe;
11918                         add_stream = x;
11919                         goto skip_stuff;
11920                 }
11921                 /*
11922                  * Ok now we proceed with copying the old out stuff and
11923                  * initializing the new stuff.
11924                  */
11925                 SCTP_TCB_SEND_LOCK(stcb);
11926                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11927                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11928                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11929                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11930                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11931                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11932                         stcb->asoc.strmout[i].stream_no = i;
11933                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11934                         /* now anything on those queues? */
11935                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11936                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11937                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11938                         }
11939                         /* Now move assoc pointers too */
11940                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11941                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11942                         }
11943                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11944                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11945                         }
11946                 }
11947                 /* now the new streams */
11948                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11949                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11950                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11951                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11952                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11953                         stcb->asoc.strmout[i].stream_no = i;
11954                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11955                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11956                 }
11957                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11958                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11959                 SCTP_TCB_SEND_UNLOCK(stcb);
11960         }
11961 skip_stuff:
11962         if ((add_stream & 1) && (adding_o > 0)) {
11963                 asoc->strm_pending_add_size = adding_o;
11964                 asoc->peer_req_out = peer_asked;
11965                 sctp_add_an_out_stream(chk, seq, adding_o);
11966                 seq++;
11967                 asoc->stream_reset_outstanding++;
11968         }
11969         if ((add_stream & 2) && (adding_i > 0)) {
11970                 sctp_add_an_in_stream(chk, seq, adding_i);
11971                 seq++;
11972                 asoc->stream_reset_outstanding++;
11973         }
11974         if (send_in_req) {
11975                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11976                 seq++;
11977                 asoc->stream_reset_outstanding++;
11978         }
11979         if (send_tsn_req) {
11980                 sctp_add_stream_reset_tsn(chk, seq);
11981                 asoc->stream_reset_outstanding++;
11982         }
11983         asoc->str_reset = chk;
11984         /* insert the chunk for sending */
11985         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11986             chk,
11987             sctp_next);
11988         asoc->ctrl_queue_cnt++;
11989         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11990         return (0);
11991 }
11992
11993 void
11994 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11995     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11996     uint8_t use_mflowid, uint32_t mflowid,
11997     uint32_t vrf_id, uint16_t port)
11998 {
11999         /* Don't respond to an ABORT with an ABORT. */
12000         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12001                 if (cause)
12002                         sctp_m_freem(cause);
12003                 return;
12004         }
12005         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12006             use_mflowid, mflowid,
12007             vrf_id, port);
12008         return;
12009 }
12010
12011 void
12012 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12013     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12014     uint8_t use_mflowid, uint32_t mflowid,
12015     uint32_t vrf_id, uint16_t port)
12016 {
12017         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12018             use_mflowid, mflowid,
12019             vrf_id, port);
12020         return;
12021 }
12022
12023 static struct mbuf *
12024 sctp_copy_resume(struct uio *uio,
12025     int max_send_len,
12026     int user_marks_eor,
12027     int *error,
12028     uint32_t * sndout,
12029     struct mbuf **new_tail)
12030 {
12031         struct mbuf *m;
12032
12033         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12034             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12035         if (m == NULL) {
12036                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12037                 *error = ENOBUFS;
12038         } else {
12039                 *sndout = m_length(m, NULL);
12040                 *new_tail = m_last(m);
12041         }
12042         return (m);
12043 }
12044
12045 static int
12046 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12047     struct uio *uio,
12048     int resv_upfront)
12049 {
12050         int left;
12051
12052         left = sp->length;
12053         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12054             resv_upfront, 0);
12055         if (sp->data == NULL) {
12056                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12057                 return (ENOBUFS);
12058         }
12059         sp->tail_mbuf = m_last(sp->data);
12060         return (0);
12061 }
12062
12063
12064
12065 static struct sctp_stream_queue_pending *
12066 sctp_copy_it_in(struct sctp_tcb *stcb,
12067     struct sctp_association *asoc,
12068     struct sctp_sndrcvinfo *srcv,
12069     struct uio *uio,
12070     struct sctp_nets *net,
12071     int max_send_len,
12072     int user_marks_eor,
12073     int *error)
12074 {
12075         /*-
12076          * This routine must be very careful in its work. Protocol
12077          * processing is up and running so care must be taken to spl...()
12078          * when you need to do something that may effect the stcb/asoc. The
12079          * sb is locked however. When data is copied the protocol processing
12080          * should be enabled since this is a slower operation...
12081          */
12082         struct sctp_stream_queue_pending *sp = NULL;
12083         int resv_in_first;
12084
12085         *error = 0;
12086         /* Now can we send this? */
12087         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12088             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12089             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12090             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12091                 /* got data while shutting down */
12092                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12093                 *error = ECONNRESET;
12094                 goto out_now;
12095         }
12096         sctp_alloc_a_strmoq(stcb, sp);
12097         if (sp == NULL) {
12098                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12099                 *error = ENOMEM;
12100                 goto out_now;
12101         }
12102         sp->act_flags = 0;
12103         sp->sender_all_done = 0;
12104         sp->sinfo_flags = srcv->sinfo_flags;
12105         sp->timetolive = srcv->sinfo_timetolive;
12106         sp->ppid = srcv->sinfo_ppid;
12107         sp->context = srcv->sinfo_context;
12108         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12109
12110         sp->stream = srcv->sinfo_stream;
12111         sp->length = min(uio->uio_resid, max_send_len);
12112         if ((sp->length == (uint32_t) uio->uio_resid) &&
12113             ((user_marks_eor == 0) ||
12114             (srcv->sinfo_flags & SCTP_EOF) ||
12115             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12116                 sp->msg_is_complete = 1;
12117         } else {
12118                 sp->msg_is_complete = 0;
12119         }
12120         sp->sender_all_done = 0;
12121         sp->some_taken = 0;
12122         sp->put_last_out = 0;
12123         resv_in_first = sizeof(struct sctp_data_chunk);
12124         sp->data = sp->tail_mbuf = NULL;
12125         if (sp->length == 0) {
12126                 *error = 0;
12127                 goto skip_copy;
12128         }
12129         if (srcv->sinfo_keynumber_valid) {
12130                 sp->auth_keyid = srcv->sinfo_keynumber;
12131         } else {
12132                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12133         }
12134         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12135                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12136                 sp->holds_key_ref = 1;
12137         }
12138         *error = sctp_copy_one(sp, uio, resv_in_first);
12139 skip_copy:
12140         if (*error) {
12141                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12142                 sp = NULL;
12143         } else {
12144                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12145                         sp->net = net;
12146                         atomic_add_int(&sp->net->ref_count, 1);
12147                 } else {
12148                         sp->net = NULL;
12149                 }
12150                 sctp_set_prsctp_policy(sp);
12151         }
12152 out_now:
12153         return (sp);
12154 }
12155
12156
12157 int
12158 sctp_sosend(struct socket *so,
12159     struct sockaddr *addr,
12160     struct uio *uio,
12161     struct mbuf *top,
12162     struct mbuf *control,
12163     int flags,
12164     struct thread *p
12165 )
12166 {
12167         int error, use_sndinfo = 0;
12168         struct sctp_sndrcvinfo sndrcvninfo;
12169         struct sockaddr *addr_to_use;
12170
12171 #if defined(INET) && defined(INET6)
12172         struct sockaddr_in sin;
12173
12174 #endif
12175
12176         if (control) {
12177                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12178                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12179                     sizeof(sndrcvninfo))) {
12180                         /* got one */
12181                         use_sndinfo = 1;
12182                 }
12183         }
12184         addr_to_use = addr;
12185 #if defined(INET) && defined(INET6)
12186         if ((addr) && (addr->sa_family == AF_INET6)) {
12187                 struct sockaddr_in6 *sin6;
12188
12189                 sin6 = (struct sockaddr_in6 *)addr;
12190                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12191                         in6_sin6_2_sin(&sin, sin6);
12192                         addr_to_use = (struct sockaddr *)&sin;
12193                 }
12194         }
12195 #endif
12196         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12197             control,
12198             flags,
12199             use_sndinfo ? &sndrcvninfo : NULL
12200             ,p
12201             );
12202         return (error);
12203 }
12204
12205
12206 int
12207 sctp_lower_sosend(struct socket *so,
12208     struct sockaddr *addr,
12209     struct uio *uio,
12210     struct mbuf *i_pak,
12211     struct mbuf *control,
12212     int flags,
12213     struct sctp_sndrcvinfo *srcv
12214     ,
12215     struct thread *p
12216 )
12217 {
12218         unsigned int sndlen = 0, max_len;
12219         int error, len;
12220         struct mbuf *top = NULL;
12221         int queue_only = 0, queue_only_for_init = 0;
12222         int free_cnt_applied = 0;
12223         int un_sent;
12224         int now_filled = 0;
12225         unsigned int inqueue_bytes = 0;
12226         struct sctp_block_entry be;
12227         struct sctp_inpcb *inp;
12228         struct sctp_tcb *stcb = NULL;
12229         struct timeval now;
12230         struct sctp_nets *net;
12231         struct sctp_association *asoc;
12232         struct sctp_inpcb *t_inp;
12233         int user_marks_eor;
12234         int create_lock_applied = 0;
12235         int nagle_applies = 0;
12236         int some_on_control = 0;
12237         int got_all_of_the_send = 0;
12238         int hold_tcblock = 0;
12239         int non_blocking = 0;
12240         uint32_t local_add_more, local_soresv = 0;
12241         uint16_t port;
12242         uint16_t sinfo_flags;
12243         sctp_assoc_t sinfo_assoc_id;
12244
12245         error = 0;
12246         net = NULL;
12247         stcb = NULL;
12248         asoc = NULL;
12249
12250         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12251         if (inp == NULL) {
12252                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12253                 error = EINVAL;
12254                 if (i_pak) {
12255                         SCTP_RELEASE_PKT(i_pak);
12256                 }
12257                 return (error);
12258         }
12259         if ((uio == NULL) && (i_pak == NULL)) {
12260                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12261                 return (EINVAL);
12262         }
12263         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12264         atomic_add_int(&inp->total_sends, 1);
12265         if (uio) {
12266                 if (uio->uio_resid < 0) {
12267                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12268                         return (EINVAL);
12269                 }
12270                 sndlen = uio->uio_resid;
12271         } else {
12272                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12273                 sndlen = SCTP_HEADER_LEN(i_pak);
12274         }
12275         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12276             (void *)addr,
12277             sndlen);
12278         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12279             (inp->sctp_socket->so_qlimit)) {
12280                 /* The listener can NOT send */
12281                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12282                 error = ENOTCONN;
12283                 goto out_unlocked;
12284         }
12285         /**
12286          * Pre-screen address, if one is given the sin-len
12287          * must be set correctly!
12288          */
12289         if (addr) {
12290                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12291
12292                 switch (raddr->sa.sa_family) {
12293 #ifdef INET
12294                 case AF_INET:
12295                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12296                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12297                                 error = EINVAL;
12298                                 goto out_unlocked;
12299                         }
12300                         port = raddr->sin.sin_port;
12301                         break;
12302 #endif
12303 #ifdef INET6
12304                 case AF_INET6:
12305                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12306                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12307                                 error = EINVAL;
12308                                 goto out_unlocked;
12309                         }
12310                         port = raddr->sin6.sin6_port;
12311                         break;
12312 #endif
12313                 default:
12314                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12315                         error = EAFNOSUPPORT;
12316                         goto out_unlocked;
12317                 }
12318         } else
12319                 port = 0;
12320
12321         if (srcv) {
12322                 sinfo_flags = srcv->sinfo_flags;
12323                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12324                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12325                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12326                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12327                         error = EINVAL;
12328                         goto out_unlocked;
12329                 }
12330                 if (srcv->sinfo_flags)
12331                         SCTP_STAT_INCR(sctps_sends_with_flags);
12332         } else {
12333                 sinfo_flags = inp->def_send.sinfo_flags;
12334                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12335         }
12336         if (sinfo_flags & SCTP_SENDALL) {
12337                 /* its a sendall */
12338                 error = sctp_sendall(inp, uio, top, srcv);
12339                 top = NULL;
12340                 goto out_unlocked;
12341         }
12342         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12343                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12344                 error = EINVAL;
12345                 goto out_unlocked;
12346         }
12347         /* now we must find the assoc */
12348         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12349             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12350                 SCTP_INP_RLOCK(inp);
12351                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12352                 if (stcb) {
12353                         SCTP_TCB_LOCK(stcb);
12354                         hold_tcblock = 1;
12355                 }
12356                 SCTP_INP_RUNLOCK(inp);
12357         } else if (sinfo_assoc_id) {
12358                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12359         } else if (addr) {
12360                 /*-
12361                  * Since we did not use findep we must
12362                  * increment it, and if we don't find a tcb
12363                  * decrement it.
12364                  */
12365                 SCTP_INP_WLOCK(inp);
12366                 SCTP_INP_INCR_REF(inp);
12367                 SCTP_INP_WUNLOCK(inp);
12368                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12369                 if (stcb == NULL) {
12370                         SCTP_INP_WLOCK(inp);
12371                         SCTP_INP_DECR_REF(inp);
12372                         SCTP_INP_WUNLOCK(inp);
12373                 } else {
12374                         hold_tcblock = 1;
12375                 }
12376         }
12377         if ((stcb == NULL) && (addr)) {
12378                 /* Possible implicit send? */
12379                 SCTP_ASOC_CREATE_LOCK(inp);
12380                 create_lock_applied = 1;
12381                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12382                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12383                         /* Should I really unlock ? */
12384                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12385                         error = EINVAL;
12386                         goto out_unlocked;
12387
12388                 }
12389                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12390                     (addr->sa_family == AF_INET6)) {
12391                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12392                         error = EINVAL;
12393                         goto out_unlocked;
12394                 }
12395                 SCTP_INP_WLOCK(inp);
12396                 SCTP_INP_INCR_REF(inp);
12397                 SCTP_INP_WUNLOCK(inp);
12398                 /* With the lock applied look again */
12399                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12400                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12401                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12402                 }
12403                 if (stcb == NULL) {
12404                         SCTP_INP_WLOCK(inp);
12405                         SCTP_INP_DECR_REF(inp);
12406                         SCTP_INP_WUNLOCK(inp);
12407                 } else {
12408                         hold_tcblock = 1;
12409                 }
12410                 if (error) {
12411                         goto out_unlocked;
12412                 }
12413                 if (t_inp != inp) {
12414                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12415                         error = ENOTCONN;
12416                         goto out_unlocked;
12417                 }
12418         }
12419         if (stcb == NULL) {
12420                 if (addr == NULL) {
12421                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12422                         error = ENOENT;
12423                         goto out_unlocked;
12424                 } else {
12425                         /* We must go ahead and start the INIT process */
12426                         uint32_t vrf_id;
12427
12428                         if ((sinfo_flags & SCTP_ABORT) ||
12429                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12430                                 /*-
12431                                  * User asks to abort a non-existant assoc,
12432                                  * or EOF a non-existant assoc with no data
12433                                  */
12434                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12435                                 error = ENOENT;
12436                                 goto out_unlocked;
12437                         }
12438                         /* get an asoc/stcb struct */
12439                         vrf_id = inp->def_vrf_id;
12440 #ifdef INVARIANTS
12441                         if (create_lock_applied == 0) {
12442                                 panic("Error, should hold create lock and I don't?");
12443                         }
12444 #endif
12445                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12446                             p
12447                             );
12448                         if (stcb == NULL) {
12449                                 /* Error is setup for us in the call */
12450                                 goto out_unlocked;
12451                         }
12452                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12453                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12454                                 /*
12455                                  * Set the connected flag so we can queue
12456                                  * data
12457                                  */
12458                                 soisconnecting(so);
12459                         }
12460                         hold_tcblock = 1;
12461                         if (create_lock_applied) {
12462                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12463                                 create_lock_applied = 0;
12464                         } else {
12465                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12466                         }
12467                         /*
12468                          * Turn on queue only flag to prevent data from
12469                          * being sent
12470                          */
12471                         queue_only = 1;
12472                         asoc = &stcb->asoc;
12473                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12474                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12475
12476                         /* initialize authentication params for the assoc */
12477                         sctp_initialize_auth_params(inp, stcb);
12478
12479                         if (control) {
12480                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12481                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12482                                         hold_tcblock = 0;
12483                                         stcb = NULL;
12484                                         goto out_unlocked;
12485                                 }
12486                         }
12487                         /* out with the INIT */
12488                         queue_only_for_init = 1;
12489                         /*-
12490                          * we may want to dig in after this call and adjust the MTU
12491                          * value. It defaulted to 1500 (constant) but the ro
12492                          * structure may now have an update and thus we may need to
12493                          * change it BEFORE we append the message.
12494                          */
12495                 }
12496         } else
12497                 asoc = &stcb->asoc;
12498         if (srcv == NULL)
12499                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12500         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12501                 if (addr)
12502                         net = sctp_findnet(stcb, addr);
12503                 else
12504                         net = NULL;
12505                 if ((net == NULL) ||
12506                     ((port != 0) && (port != stcb->rport))) {
12507                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12508                         error = EINVAL;
12509                         goto out_unlocked;
12510                 }
12511         } else {
12512                 if (stcb->asoc.alternate) {
12513                         net = stcb->asoc.alternate;
12514                 } else {
12515                         net = stcb->asoc.primary_destination;
12516                 }
12517         }
12518         atomic_add_int(&stcb->total_sends, 1);
12519         /* Keep the stcb from being freed under our feet */
12520         atomic_add_int(&asoc->refcnt, 1);
12521         free_cnt_applied = 1;
12522
12523         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12524                 if (sndlen > asoc->smallest_mtu) {
12525                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12526                         error = EMSGSIZE;
12527                         goto out_unlocked;
12528                 }
12529         }
12530         if (SCTP_SO_IS_NBIO(so)
12531             || (flags & MSG_NBIO)
12532             ) {
12533                 non_blocking = 1;
12534         }
12535         /* would we block? */
12536         if (non_blocking) {
12537                 if (hold_tcblock == 0) {
12538                         SCTP_TCB_LOCK(stcb);
12539                         hold_tcblock = 1;
12540                 }
12541                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12542                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12543                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12544                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12545                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12546                                 error = EMSGSIZE;
12547                         else
12548                                 error = EWOULDBLOCK;
12549                         goto out_unlocked;
12550                 }
12551                 stcb->asoc.sb_send_resv += sndlen;
12552                 SCTP_TCB_UNLOCK(stcb);
12553                 hold_tcblock = 0;
12554         } else {
12555                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12556         }
12557         local_soresv = sndlen;
12558         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12559                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12560                 error = ECONNRESET;
12561                 goto out_unlocked;
12562         }
12563         if (create_lock_applied) {
12564                 SCTP_ASOC_CREATE_UNLOCK(inp);
12565                 create_lock_applied = 0;
12566         }
12567         if (asoc->stream_reset_outstanding) {
12568                 /*
12569                  * Can't queue any data while stream reset is underway.
12570                  */
12571                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12572                 error = EAGAIN;
12573                 goto out_unlocked;
12574         }
12575         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12576             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12577                 queue_only = 1;
12578         }
12579         /* we are now done with all control */
12580         if (control) {
12581                 sctp_m_freem(control);
12582                 control = NULL;
12583         }
12584         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12585             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12586             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12587             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12588                 if (srcv->sinfo_flags & SCTP_ABORT) {
12589                         ;
12590                 } else {
12591                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12592                         error = ECONNRESET;
12593                         goto out_unlocked;
12594                 }
12595         }
12596         /* Ok, we will attempt a msgsnd :> */
12597         if (p) {
12598                 p->td_ru.ru_msgsnd++;
12599         }
12600         /* Are we aborting? */
12601         if (srcv->sinfo_flags & SCTP_ABORT) {
12602                 struct mbuf *mm;
12603                 int tot_demand, tot_out = 0, max_out;
12604
12605                 SCTP_STAT_INCR(sctps_sends_with_abort);
12606                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12607                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12608                         /* It has to be up before we abort */
12609                         /* how big is the user initiated abort? */
12610                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12611                         error = EINVAL;
12612                         goto out;
12613                 }
12614                 if (hold_tcblock) {
12615                         SCTP_TCB_UNLOCK(stcb);
12616                         hold_tcblock = 0;
12617                 }
12618                 if (top) {
12619                         struct mbuf *cntm = NULL;
12620
12621                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12622                         if (sndlen != 0) {
12623                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12624                                         tot_out += SCTP_BUF_LEN(cntm);
12625                                 }
12626                         }
12627                 } else {
12628                         /* Must fit in a MTU */
12629                         tot_out = sndlen;
12630                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12631                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12632                                 /* To big */
12633                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12634                                 error = EMSGSIZE;
12635                                 goto out;
12636                         }
12637                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12638                 }
12639                 if (mm == NULL) {
12640                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12641                         error = ENOMEM;
12642                         goto out;
12643                 }
12644                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12645                 max_out -= sizeof(struct sctp_abort_msg);
12646                 if (tot_out > max_out) {
12647                         tot_out = max_out;
12648                 }
12649                 if (mm) {
12650                         struct sctp_paramhdr *ph;
12651
12652                         /* now move forward the data pointer */
12653                         ph = mtod(mm, struct sctp_paramhdr *);
12654                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12655                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12656                         ph++;
12657                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12658                         if (top == NULL) {
12659                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12660                                 if (error) {
12661                                         /*-
12662                                          * Here if we can't get his data we
12663                                          * still abort we just don't get to
12664                                          * send the users note :-0
12665                                          */
12666                                         sctp_m_freem(mm);
12667                                         mm = NULL;
12668                                 }
12669                         } else {
12670                                 if (sndlen != 0) {
12671                                         SCTP_BUF_NEXT(mm) = top;
12672                                 }
12673                         }
12674                 }
12675                 if (hold_tcblock == 0) {
12676                         SCTP_TCB_LOCK(stcb);
12677                 }
12678                 atomic_add_int(&stcb->asoc.refcnt, -1);
12679                 free_cnt_applied = 0;
12680                 /* release this lock, otherwise we hang on ourselves */
12681                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12682                 /* now relock the stcb so everything is sane */
12683                 hold_tcblock = 0;
12684                 stcb = NULL;
12685                 /*
12686                  * In this case top is already chained to mm avoid double
12687                  * free, since we free it below if top != NULL and driver
12688                  * would free it after sending the packet out
12689                  */
12690                 if (sndlen != 0) {
12691                         top = NULL;
12692                 }
12693                 goto out_unlocked;
12694         }
12695         /* Calculate the maximum we can send */
12696         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12697         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12698                 if (non_blocking) {
12699                         /* we already checked for non-blocking above. */
12700                         max_len = sndlen;
12701                 } else {
12702                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12703                 }
12704         } else {
12705                 max_len = 0;
12706         }
12707         if (hold_tcblock) {
12708                 SCTP_TCB_UNLOCK(stcb);
12709                 hold_tcblock = 0;
12710         }
12711         /* Is the stream no. valid? */
12712         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12713                 /* Invalid stream number */
12714                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12715                 error = EINVAL;
12716                 goto out_unlocked;
12717         }
12718         if (asoc->strmout == NULL) {
12719                 /* huh? software error */
12720                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12721                 error = EFAULT;
12722                 goto out_unlocked;
12723         }
12724         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12725         if ((user_marks_eor == 0) &&
12726             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12727                 /* It will NEVER fit */
12728                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12729                 error = EMSGSIZE;
12730                 goto out_unlocked;
12731         }
12732         if ((uio == NULL) && user_marks_eor) {
12733                 /*-
12734                  * We do not support eeor mode for
12735                  * sending with mbuf chains (like sendfile).
12736                  */
12737                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12738                 error = EINVAL;
12739                 goto out_unlocked;
12740         }
12741         if (user_marks_eor) {
12742                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12743         } else {
12744                 /*-
12745                  * For non-eeor the whole message must fit in
12746                  * the socket send buffer.
12747                  */
12748                 local_add_more = sndlen;
12749         }
12750         len = 0;
12751         if (non_blocking) {
12752                 goto skip_preblock;
12753         }
12754         if (((max_len <= local_add_more) &&
12755             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12756             (max_len == 0) ||
12757             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12758                 /* No room right now ! */
12759                 SOCKBUF_LOCK(&so->so_snd);
12760                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12761                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12762                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12763                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12764                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12765                             inqueue_bytes,
12766                             local_add_more,
12767                             stcb->asoc.stream_queue_cnt,
12768                             stcb->asoc.chunks_on_out_queue,
12769                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12770                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12771                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12772                         }
12773                         be.error = 0;
12774                         stcb->block_entry = &be;
12775                         error = sbwait(&so->so_snd);
12776                         stcb->block_entry = NULL;
12777                         if (error || so->so_error || be.error) {
12778                                 if (error == 0) {
12779                                         if (so->so_error)
12780                                                 error = so->so_error;
12781                                         if (be.error) {
12782                                                 error = be.error;
12783                                         }
12784                                 }
12785                                 SOCKBUF_UNLOCK(&so->so_snd);
12786                                 goto out_unlocked;
12787                         }
12788                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12789                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12790                                     asoc, stcb->asoc.total_output_queue_size);
12791                         }
12792                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12793                                 goto out_unlocked;
12794                         }
12795                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12796                 }
12797                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12798                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12799                 } else {
12800                         max_len = 0;
12801                 }
12802                 SOCKBUF_UNLOCK(&so->so_snd);
12803         }
12804 skip_preblock:
12805         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12806                 goto out_unlocked;
12807         }
12808         /*
12809          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12810          * case NOTE: uio will be null when top/mbuf is passed
12811          */
12812         if (sndlen == 0) {
12813                 if (srcv->sinfo_flags & SCTP_EOF) {
12814                         got_all_of_the_send = 1;
12815                         goto dataless_eof;
12816                 } else {
12817                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12818                         error = EINVAL;
12819                         goto out;
12820                 }
12821         }
12822         if (top == NULL) {
12823                 struct sctp_stream_queue_pending *sp;
12824                 struct sctp_stream_out *strm;
12825                 uint32_t sndout;
12826
12827                 SCTP_TCB_SEND_LOCK(stcb);
12828                 if ((asoc->stream_locked) &&
12829                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12830                         SCTP_TCB_SEND_UNLOCK(stcb);
12831                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12832                         error = EINVAL;
12833                         goto out;
12834                 }
12835                 SCTP_TCB_SEND_UNLOCK(stcb);
12836
12837                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12838                 if (strm->last_msg_incomplete == 0) {
12839         do_a_copy_in:
12840                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12841                         if ((sp == NULL) || (error)) {
12842                                 goto out;
12843                         }
12844                         SCTP_TCB_SEND_LOCK(stcb);
12845                         if (sp->msg_is_complete) {
12846                                 strm->last_msg_incomplete = 0;
12847                                 asoc->stream_locked = 0;
12848                         } else {
12849                                 /*
12850                                  * Just got locked to this guy in case of an
12851                                  * interrupt.
12852                                  */
12853                                 strm->last_msg_incomplete = 1;
12854                                 asoc->stream_locked = 1;
12855                                 asoc->stream_locked_on = srcv->sinfo_stream;
12856                                 sp->sender_all_done = 0;
12857                         }
12858                         sctp_snd_sb_alloc(stcb, sp->length);
12859                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12860                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12861                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12862                         }
12863                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12864                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12865                         SCTP_TCB_SEND_UNLOCK(stcb);
12866                 } else {
12867                         SCTP_TCB_SEND_LOCK(stcb);
12868                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12869                         SCTP_TCB_SEND_UNLOCK(stcb);
12870                         if (sp == NULL) {
12871                                 /* ???? Huh ??? last msg is gone */
12872 #ifdef INVARIANTS
12873                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12874 #else
12875                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12876                                 strm->last_msg_incomplete = 0;
12877 #endif
12878                                 goto do_a_copy_in;
12879
12880                         }
12881                 }
12882                 while (uio->uio_resid > 0) {
12883                         /* How much room do we have? */
12884                         struct mbuf *new_tail, *mm;
12885
12886                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12887                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12888                         else
12889                                 max_len = 0;
12890
12891                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12892                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12893                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12894                                 sndout = 0;
12895                                 new_tail = NULL;
12896                                 if (hold_tcblock) {
12897                                         SCTP_TCB_UNLOCK(stcb);
12898                                         hold_tcblock = 0;
12899                                 }
12900                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12901                                 if ((mm == NULL) || error) {
12902                                         if (mm) {
12903                                                 sctp_m_freem(mm);
12904                                         }
12905                                         goto out;
12906                                 }
12907                                 /* Update the mbuf and count */
12908                                 SCTP_TCB_SEND_LOCK(stcb);
12909                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12910                                         /*
12911                                          * we need to get out. Peer probably
12912                                          * aborted.
12913                                          */
12914                                         sctp_m_freem(mm);
12915                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12916                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12917                                                 error = ECONNRESET;
12918                                         }
12919                                         SCTP_TCB_SEND_UNLOCK(stcb);
12920                                         goto out;
12921                                 }
12922                                 if (sp->tail_mbuf) {
12923                                         /* tack it to the end */
12924                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12925                                         sp->tail_mbuf = new_tail;
12926                                 } else {
12927                                         /* A stolen mbuf */
12928                                         sp->data = mm;
12929                                         sp->tail_mbuf = new_tail;
12930                                 }
12931                                 sctp_snd_sb_alloc(stcb, sndout);
12932                                 atomic_add_int(&sp->length, sndout);
12933                                 len += sndout;
12934
12935                                 /* Did we reach EOR? */
12936                                 if ((uio->uio_resid == 0) &&
12937                                     ((user_marks_eor == 0) ||
12938                                     (srcv->sinfo_flags & SCTP_EOF) ||
12939                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12940                                         sp->msg_is_complete = 1;
12941                                 } else {
12942                                         sp->msg_is_complete = 0;
12943                                 }
12944                                 SCTP_TCB_SEND_UNLOCK(stcb);
12945                         }
12946                         if (uio->uio_resid == 0) {
12947                                 /* got it all? */
12948                                 continue;
12949                         }
12950                         /* PR-SCTP? */
12951                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12952                                 /*
12953                                  * This is ugly but we must assure locking
12954                                  * order
12955                                  */
12956                                 if (hold_tcblock == 0) {
12957                                         SCTP_TCB_LOCK(stcb);
12958                                         hold_tcblock = 1;
12959                                 }
12960                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12961                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12962                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12963                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12964                                 else
12965                                         max_len = 0;
12966                                 if (max_len > 0) {
12967                                         continue;
12968                                 }
12969                                 SCTP_TCB_UNLOCK(stcb);
12970                                 hold_tcblock = 0;
12971                         }
12972                         /* wait for space now */
12973                         if (non_blocking) {
12974                                 /* Non-blocking io in place out */
12975                                 goto skip_out_eof;
12976                         }
12977                         /* What about the INIT, send it maybe */
12978                         if (queue_only_for_init) {
12979                                 if (hold_tcblock == 0) {
12980                                         SCTP_TCB_LOCK(stcb);
12981                                         hold_tcblock = 1;
12982                                 }
12983                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12984                                         /* a collision took us forward? */
12985                                         queue_only = 0;
12986                                 } else {
12987                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12988                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12989                                         queue_only = 1;
12990                                 }
12991                         }
12992                         if ((net->flight_size > net->cwnd) &&
12993                             (asoc->sctp_cmt_on_off == 0)) {
12994                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12995                                 queue_only = 1;
12996                         } else if (asoc->ifp_had_enobuf) {
12997                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12998                                 if (net->flight_size > (2 * net->mtu)) {
12999                                         queue_only = 1;
13000                                 }
13001                                 asoc->ifp_had_enobuf = 0;
13002                         }
13003                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13004                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13005                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13006                             (stcb->asoc.total_flight > 0) &&
13007                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13008                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13009
13010                                 /*-
13011                                  * Ok, Nagle is set on and we have data outstanding.
13012                                  * Don't send anything and let SACKs drive out the
13013                                  * data unless wen have a "full" segment to send.
13014                                  */
13015                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13016                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13017                                 }
13018                                 SCTP_STAT_INCR(sctps_naglequeued);
13019                                 nagle_applies = 1;
13020                         } else {
13021                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13022                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13023                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13024                                 }
13025                                 SCTP_STAT_INCR(sctps_naglesent);
13026                                 nagle_applies = 0;
13027                         }
13028                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13029
13030                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13031                                     nagle_applies, un_sent);
13032                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13033                                     stcb->asoc.total_flight,
13034                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13035                         }
13036                         if (queue_only_for_init)
13037                                 queue_only_for_init = 0;
13038                         if ((queue_only == 0) && (nagle_applies == 0)) {
13039                                 /*-
13040                                  * need to start chunk output
13041                                  * before blocking.. note that if
13042                                  * a lock is already applied, then
13043                                  * the input via the net is happening
13044                                  * and I don't need to start output :-D
13045                                  */
13046                                 if (hold_tcblock == 0) {
13047                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13048                                                 hold_tcblock = 1;
13049                                                 sctp_chunk_output(inp,
13050                                                     stcb,
13051                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13052                                         }
13053                                 } else {
13054                                         sctp_chunk_output(inp,
13055                                             stcb,
13056                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13057                                 }
13058                                 if (hold_tcblock == 1) {
13059                                         SCTP_TCB_UNLOCK(stcb);
13060                                         hold_tcblock = 0;
13061                                 }
13062                         }
13063                         SOCKBUF_LOCK(&so->so_snd);
13064                         /*-
13065                          * This is a bit strange, but I think it will
13066                          * work. The total_output_queue_size is locked and
13067                          * protected by the TCB_LOCK, which we just released.
13068                          * There is a race that can occur between releasing it
13069                          * above, and me getting the socket lock, where sacks
13070                          * come in but we have not put the SB_WAIT on the
13071                          * so_snd buffer to get the wakeup. After the LOCK
13072                          * is applied the sack_processing will also need to
13073                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13074                          * once we have the socket buffer lock if we recheck the
13075                          * size we KNOW we will get to sleep safely with the
13076                          * wakeup flag in place.
13077                          */
13078                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13079                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13080                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13081                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13082                                             asoc, uio->uio_resid);
13083                                 }
13084                                 be.error = 0;
13085                                 stcb->block_entry = &be;
13086                                 error = sbwait(&so->so_snd);
13087                                 stcb->block_entry = NULL;
13088
13089                                 if (error || so->so_error || be.error) {
13090                                         if (error == 0) {
13091                                                 if (so->so_error)
13092                                                         error = so->so_error;
13093                                                 if (be.error) {
13094                                                         error = be.error;
13095                                                 }
13096                                         }
13097                                         SOCKBUF_UNLOCK(&so->so_snd);
13098                                         goto out_unlocked;
13099                                 }
13100                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13101                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13102                                             asoc, stcb->asoc.total_output_queue_size);
13103                                 }
13104                         }
13105                         SOCKBUF_UNLOCK(&so->so_snd);
13106                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13107                                 goto out_unlocked;
13108                         }
13109                 }
13110                 SCTP_TCB_SEND_LOCK(stcb);
13111                 if (sp) {
13112                         if (sp->msg_is_complete == 0) {
13113                                 strm->last_msg_incomplete = 1;
13114                                 asoc->stream_locked = 1;
13115                                 asoc->stream_locked_on = srcv->sinfo_stream;
13116                         } else {
13117                                 sp->sender_all_done = 1;
13118                                 strm->last_msg_incomplete = 0;
13119                                 asoc->stream_locked = 0;
13120                         }
13121                 } else {
13122                         SCTP_PRINTF("Huh no sp TSNH?\n");
13123                         strm->last_msg_incomplete = 0;
13124                         asoc->stream_locked = 0;
13125                 }
13126                 SCTP_TCB_SEND_UNLOCK(stcb);
13127                 if (uio->uio_resid == 0) {
13128                         got_all_of_the_send = 1;
13129                 }
13130         } else {
13131                 /* We send in a 0, since we do NOT have any locks */
13132                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13133                 top = NULL;
13134                 if (srcv->sinfo_flags & SCTP_EOF) {
13135                         /*
13136                          * This should only happen for Panda for the mbuf
13137                          * send case, which does NOT yet support EEOR mode.
13138                          * Thus, we can just set this flag to do the proper
13139                          * EOF handling.
13140                          */
13141                         got_all_of_the_send = 1;
13142                 }
13143         }
13144         if (error) {
13145                 goto out;
13146         }
13147 dataless_eof:
13148         /* EOF thing ? */
13149         if ((srcv->sinfo_flags & SCTP_EOF) &&
13150             (got_all_of_the_send == 1)) {
13151                 int cnt;
13152
13153                 SCTP_STAT_INCR(sctps_sends_with_eof);
13154                 error = 0;
13155                 if (hold_tcblock == 0) {
13156                         SCTP_TCB_LOCK(stcb);
13157                         hold_tcblock = 1;
13158                 }
13159                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13160                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13161                     TAILQ_EMPTY(&asoc->sent_queue) &&
13162                     (cnt == 0)) {
13163                         if (asoc->locked_on_sending) {
13164                                 goto abort_anyway;
13165                         }
13166                         /* there is nothing queued to send, so I'm done... */
13167                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13168                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13169                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13170                                 struct sctp_nets *netp;
13171
13172                                 /* only send SHUTDOWN the first time through */
13173                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13174                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13175                                 }
13176                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13177                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13178                                 sctp_stop_timers_for_shutdown(stcb);
13179                                 if (stcb->asoc.alternate) {
13180                                         netp = stcb->asoc.alternate;
13181                                 } else {
13182                                         netp = stcb->asoc.primary_destination;
13183                                 }
13184                                 sctp_send_shutdown(stcb, netp);
13185                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13186                                     netp);
13187                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13188                                     asoc->primary_destination);
13189                         }
13190                 } else {
13191                         /*-
13192                          * we still got (or just got) data to send, so set
13193                          * SHUTDOWN_PENDING
13194                          */
13195                         /*-
13196                          * XXX sockets draft says that SCTP_EOF should be
13197                          * sent with no data.  currently, we will allow user
13198                          * data to be sent first and move to
13199                          * SHUTDOWN-PENDING
13200                          */
13201                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13202                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13203                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13204                                 if (hold_tcblock == 0) {
13205                                         SCTP_TCB_LOCK(stcb);
13206                                         hold_tcblock = 1;
13207                                 }
13208                                 if (asoc->locked_on_sending) {
13209                                         /* Locked to send out the data */
13210                                         struct sctp_stream_queue_pending *sp;
13211
13212                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13213                                         if (sp) {
13214                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13215                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13216                                         }
13217                                 }
13218                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13219                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13220                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13221                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13222                         abort_anyway:
13223                                         if (free_cnt_applied) {
13224                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13225                                                 free_cnt_applied = 0;
13226                                         }
13227                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13228                                             NULL, SCTP_SO_LOCKED);
13229                                         /*
13230                                          * now relock the stcb so everything
13231                                          * is sane
13232                                          */
13233                                         hold_tcblock = 0;
13234                                         stcb = NULL;
13235                                         goto out;
13236                                 }
13237                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13238                                     asoc->primary_destination);
13239                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13240                         }
13241                 }
13242         }
13243 skip_out_eof:
13244         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13245                 some_on_control = 1;
13246         }
13247         if (queue_only_for_init) {
13248                 if (hold_tcblock == 0) {
13249                         SCTP_TCB_LOCK(stcb);
13250                         hold_tcblock = 1;
13251                 }
13252                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13253                         /* a collision took us forward? */
13254                         queue_only = 0;
13255                 } else {
13256                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13257                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13258                         queue_only = 1;
13259                 }
13260         }
13261         if ((net->flight_size > net->cwnd) &&
13262             (stcb->asoc.sctp_cmt_on_off == 0)) {
13263                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13264                 queue_only = 1;
13265         } else if (asoc->ifp_had_enobuf) {
13266                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13267                 if (net->flight_size > (2 * net->mtu)) {
13268                         queue_only = 1;
13269                 }
13270                 asoc->ifp_had_enobuf = 0;
13271         }
13272         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13273             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13274         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13275             (stcb->asoc.total_flight > 0) &&
13276             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13277             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13278                 /*-
13279                  * Ok, Nagle is set on and we have data outstanding.
13280                  * Don't send anything and let SACKs drive out the
13281                  * data unless wen have a "full" segment to send.
13282                  */
13283                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13284                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13285                 }
13286                 SCTP_STAT_INCR(sctps_naglequeued);
13287                 nagle_applies = 1;
13288         } else {
13289                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13290                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13291                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13292                 }
13293                 SCTP_STAT_INCR(sctps_naglesent);
13294                 nagle_applies = 0;
13295         }
13296         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13297                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13298                     nagle_applies, un_sent);
13299                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13300                     stcb->asoc.total_flight,
13301                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13302         }
13303         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13304                 /* we can attempt to send too. */
13305                 if (hold_tcblock == 0) {
13306                         /*
13307                          * If there is activity recv'ing sacks no need to
13308                          * send
13309                          */
13310                         if (SCTP_TCB_TRYLOCK(stcb)) {
13311                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13312                                 hold_tcblock = 1;
13313                         }
13314                 } else {
13315                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13316                 }
13317         } else if ((queue_only == 0) &&
13318                     (stcb->asoc.peers_rwnd == 0) &&
13319             (stcb->asoc.total_flight == 0)) {
13320                 /* We get to have a probe outstanding */
13321                 if (hold_tcblock == 0) {
13322                         hold_tcblock = 1;
13323                         SCTP_TCB_LOCK(stcb);
13324                 }
13325                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13326         } else if (some_on_control) {
13327                 int num_out, reason, frag_point;
13328
13329                 /* Here we do control only */
13330                 if (hold_tcblock == 0) {
13331                         hold_tcblock = 1;
13332                         SCTP_TCB_LOCK(stcb);
13333                 }
13334                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13335                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13336                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13337         }
13338         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13339             queue_only, stcb->asoc.peers_rwnd, un_sent,
13340             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13341             stcb->asoc.total_output_queue_size, error);
13342
13343 out:
13344 out_unlocked:
13345
13346         if (local_soresv && stcb) {
13347                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13348         }
13349         if (create_lock_applied) {
13350                 SCTP_ASOC_CREATE_UNLOCK(inp);
13351         }
13352         if ((stcb) && hold_tcblock) {
13353                 SCTP_TCB_UNLOCK(stcb);
13354         }
13355         if (stcb && free_cnt_applied) {
13356                 atomic_add_int(&stcb->asoc.refcnt, -1);
13357         }
13358 #ifdef INVARIANTS
13359         if (stcb) {
13360                 if (mtx_owned(&stcb->tcb_mtx)) {
13361                         panic("Leaving with tcb mtx owned?");
13362                 }
13363                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13364                         panic("Leaving with tcb send mtx owned?");
13365                 }
13366         }
13367 #endif
13368 #ifdef INVARIANTS
13369         if (inp) {
13370                 sctp_validate_no_locks(inp);
13371         } else {
13372                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13373         }
13374 #endif
13375         if (top) {
13376                 sctp_m_freem(top);
13377         }
13378         if (control) {
13379                 sctp_m_freem(control);
13380         }
13381         return (error);
13382 }
13383
13384
13385 /*
13386  * generate an AUTHentication chunk, if required
13387  */
13388 struct mbuf *
13389 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13390     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13391     struct sctp_tcb *stcb, uint8_t chunk)
13392 {
13393         struct mbuf *m_auth;
13394         struct sctp_auth_chunk *auth;
13395         int chunk_len;
13396         struct mbuf *cn;
13397
13398         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13399             (stcb == NULL))
13400                 return (m);
13401
13402         /* sysctl disabled auth? */
13403         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13404                 return (m);
13405
13406         /* peer doesn't do auth... */
13407         if (!stcb->asoc.peer_supports_auth) {
13408                 return (m);
13409         }
13410         /* does the requested chunk require auth? */
13411         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13412                 return (m);
13413         }
13414         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13415         if (m_auth == NULL) {
13416                 /* no mbuf's */
13417                 return (m);
13418         }
13419         /* reserve some space if this will be the first mbuf */
13420         if (m == NULL)
13421                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13422         /* fill in the AUTH chunk details */
13423         auth = mtod(m_auth, struct sctp_auth_chunk *);
13424         bzero(auth, sizeof(*auth));
13425         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13426         auth->ch.chunk_flags = 0;
13427         chunk_len = sizeof(*auth) +
13428             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13429         auth->ch.chunk_length = htons(chunk_len);
13430         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13431         /* key id and hmac digest will be computed and filled in upon send */
13432
13433         /* save the offset where the auth was inserted into the chain */
13434         *offset = 0;
13435         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13436                 *offset += SCTP_BUF_LEN(cn);
13437         }
13438
13439         /* update length and return pointer to the auth chunk */
13440         SCTP_BUF_LEN(m_auth) = chunk_len;
13441         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13442         if (auth_ret != NULL)
13443                 *auth_ret = auth;
13444
13445         return (m);
13446 }
13447
13448 #ifdef INET6
13449 int
13450 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13451 {
13452         struct nd_prefix *pfx = NULL;
13453         struct nd_pfxrouter *pfxrtr = NULL;
13454         struct sockaddr_in6 gw6;
13455
13456         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13457                 return (0);
13458
13459         /* get prefix entry of address */
13460         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13461                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13462                         continue;
13463                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13464                     &src6->sin6_addr, &pfx->ndpr_mask))
13465                         break;
13466         }
13467         /* no prefix entry in the prefix list */
13468         if (pfx == NULL) {
13469                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13470                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13471                 return (0);
13472         }
13473         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13474         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13475
13476         /* search installed gateway from prefix entry */
13477         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13478                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13479                 gw6.sin6_family = AF_INET6;
13480                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13481                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13482                     sizeof(struct in6_addr));
13483                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13484                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13485                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13486                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13487                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13488                     ro->ro_rt->rt_gateway)) {
13489                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13490                         return (1);
13491                 }
13492         }
13493         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13494         return (0);
13495 }
13496
13497 #endif
13498
13499 int
13500 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13501 {
13502 #ifdef INET
13503         struct sockaddr_in *sin, *mask;
13504         struct ifaddr *ifa;
13505         struct in_addr srcnetaddr, gwnetaddr;
13506
13507         if (ro == NULL || ro->ro_rt == NULL ||
13508             sifa->address.sa.sa_family != AF_INET) {
13509                 return (0);
13510         }
13511         ifa = (struct ifaddr *)sifa->ifa;
13512         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13513         sin = (struct sockaddr_in *)&sifa->address.sin;
13514         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13515         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13516         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13517         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13518
13519         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13520         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13521         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13522         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13523         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13524         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13525                 return (1);
13526         }
13527 #endif
13528         return (0);
13529 }