sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 const struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871         if ((scope->loopback_scope == 0) &&
1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873                 /*
1874                  * skip loopback if not in scope *
1875                  */
1876                 return (0);
1877         }
1878         switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880         case AF_INET:
1881                 if (scope->ipv4_addr_legal) {
1882                         struct sockaddr_in *sin;
1883
1884                         sin = &ifa->address.sin;
1885                         if (sin->sin_addr.s_addr == 0) {
1886                                 /* not in scope , unspecified */
1887                                 return (0);
1888                         }
1889                         if ((scope->ipv4_local_scope == 0) &&
1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891                                 /* private address not in scope */
1892                                 return (0);
1893                         }
1894                 } else {
1895                         return (0);
1896                 }
1897                 break;
1898 #endif
1899 #ifdef INET6
1900         case AF_INET6:
1901                 if (scope->ipv6_addr_legal) {
1902                         struct sockaddr_in6 *sin6;
1903
1904                         /*
1905                          * Must update the flags,  bummer, which means any
1906                          * IFA locks must now be applied HERE <->
1907                          */
1908                         if (do_update) {
1909                                 sctp_gather_internal_ifa_flags(ifa);
1910                         }
1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912                                 return (0);
1913                         }
1914                         /* ok to use deprecated addresses? */
1915                         sin6 = &ifa->address.sin6;
1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917                                 /* skip unspecifed addresses */
1918                                 return (0);
1919                         }
1920                         if (    /* (local_scope == 0) && */
1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922                                 return (0);
1923                         }
1924                         if ((scope->site_scope == 0) &&
1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                 } else {
1929                         return (0);
1930                 }
1931                 break;
1932 #endif
1933         default:
1934                 return (0);
1935         }
1936         return (1);
1937 }
1938
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943         struct sctp_paramhdr *parmh;
1944         struct mbuf *mret;
1945         uint16_t plen;
1946
1947 #endif
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963 #if defined(INET) || defined(INET6)
1964         if (M_TRAILINGSPACE(m) >= plen) {
1965                 /* easy side we just drop it on the end */
1966                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967                 mret = m;
1968         } else {
1969                 /* Need more space */
1970                 mret = m;
1971                 while (SCTP_BUF_NEXT(mret) != NULL) {
1972                         mret = SCTP_BUF_NEXT(mret);
1973                 }
1974                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1975                 if (SCTP_BUF_NEXT(mret) == NULL) {
1976                         /* We are hosed, can't add more addresses */
1977                         return (m);
1978                 }
1979                 mret = SCTP_BUF_NEXT(mret);
1980                 parmh = mtod(mret, struct sctp_paramhdr *);
1981         }
1982         /* now add the parameter */
1983         switch (ifa->address.sa.sa_family) {
1984 #ifdef INET
1985         case AF_INET:
1986                 {
1987                         struct sctp_ipv4addr_param *ipv4p;
1988                         struct sockaddr_in *sin;
1989
1990                         sin = &ifa->address.sin;
1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993                         parmh->param_length = htons(plen);
1994                         ipv4p->addr = sin->sin_addr.s_addr;
1995                         SCTP_BUF_LEN(mret) += plen;
1996                         break;
1997                 }
1998 #endif
1999 #ifdef INET6
2000         case AF_INET6:
2001                 {
2002                         struct sctp_ipv6addr_param *ipv6p;
2003                         struct sockaddr_in6 *sin6;
2004
2005                         sin6 = &ifa->address.sin6;
2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008                         parmh->param_length = htons(plen);
2009                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2010                             sizeof(ipv6p->addr));
2011                         /* clear embedded scope in the address */
2012                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2013                         SCTP_BUF_LEN(mret) += plen;
2014                         break;
2015                 }
2016 #endif
2017         default:
2018                 return (m);
2019         }
2020         if (len != NULL) {
2021                 *len += plen;
2022         }
2023         return (mret);
2024 #endif
2025 }
2026
2027
2028 struct mbuf *
2029 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2030     struct sctp_scoping *scope,
2031     struct mbuf *m_at, int cnt_inits_to,
2032     uint16_t * padding_len, uint16_t * chunk_len)
2033 {
2034         struct sctp_vrf *vrf = NULL;
2035         int cnt, limit_out = 0, total_count;
2036         uint32_t vrf_id;
2037
2038         vrf_id = inp->def_vrf_id;
2039         SCTP_IPI_ADDR_RLOCK();
2040         vrf = sctp_find_vrf(vrf_id);
2041         if (vrf == NULL) {
2042                 SCTP_IPI_ADDR_RUNLOCK();
2043                 return (m_at);
2044         }
2045         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2046                 struct sctp_ifa *sctp_ifap;
2047                 struct sctp_ifn *sctp_ifnp;
2048
2049                 cnt = cnt_inits_to;
2050                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2051                         limit_out = 1;
2052                         cnt = SCTP_ADDRESS_LIMIT;
2053                         goto skip_count;
2054                 }
2055                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2056                         if ((scope->loopback_scope == 0) &&
2057                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2058                                 /*
2059                                  * Skip loopback devices if loopback_scope
2060                                  * not set
2061                                  */
2062                                 continue;
2063                         }
2064                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2065 #ifdef INET
2066                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2067                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2068                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2069                                         continue;
2070                                 }
2071 #endif
2072 #ifdef INET6
2073                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2074                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2075                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2076                                         continue;
2077                                 }
2078 #endif
2079                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2080                                         continue;
2081                                 }
2082                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2083                                         continue;
2084                                 }
2085                                 cnt++;
2086                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2087                                         break;
2088                                 }
2089                         }
2090                         if (cnt > SCTP_ADDRESS_LIMIT) {
2091                                 break;
2092                         }
2093                 }
2094 skip_count:
2095                 if (cnt > 1) {
2096                         total_count = 0;
2097                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2098                                 cnt = 0;
2099                                 if ((scope->loopback_scope == 0) &&
2100                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2101                                         /*
2102                                          * Skip loopback devices if
2103                                          * loopback_scope not set
2104                                          */
2105                                         continue;
2106                                 }
2107                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2108 #ifdef INET
2109                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2110                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2111                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2112                                                 continue;
2113                                         }
2114 #endif
2115 #ifdef INET6
2116                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2117                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2118                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2119                                                 continue;
2120                                         }
2121 #endif
2122                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2123                                                 continue;
2124                                         }
2125                                         if (sctp_is_address_in_scope(sctp_ifap,
2126                                             scope, 0) == 0) {
2127                                                 continue;
2128                                         }
2129                                         if ((chunk_len != NULL) &&
2130                                             (padding_len != NULL) &&
2131                                             (*padding_len > 0)) {
2132                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2133                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2134                                                 *chunk_len += *padding_len;
2135                                                 *padding_len = 0;
2136                                         }
2137                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2138                                         if (limit_out) {
2139                                                 cnt++;
2140                                                 total_count++;
2141                                                 if (cnt >= 2) {
2142                                                         /*
2143                                                          * two from each
2144                                                          * address
2145                                                          */
2146                                                         break;
2147                                                 }
2148                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2149                                                         /* No more addresses */
2150                                                         break;
2151                                                 }
2152                                         }
2153                                 }
2154                         }
2155                 }
2156         } else {
2157                 struct sctp_laddr *laddr;
2158
2159                 cnt = cnt_inits_to;
2160                 /* First, how many ? */
2161                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2162                         if (laddr->ifa == NULL) {
2163                                 continue;
2164                         }
2165                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2166                                 /*
2167                                  * Address being deleted by the system, dont
2168                                  * list.
2169                                  */
2170                                 continue;
2171                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2172                                 /*
2173                                  * Address being deleted on this ep don't
2174                                  * list.
2175                                  */
2176                                 continue;
2177                         }
2178                         if (sctp_is_address_in_scope(laddr->ifa,
2179                             scope, 1) == 0) {
2180                                 continue;
2181                         }
2182                         cnt++;
2183                 }
2184                 /*
2185                  * To get through a NAT we only list addresses if we have
2186                  * more than one. That way if you just bind a single address
2187                  * we let the source of the init dictate our address.
2188                  */
2189                 if (cnt > 1) {
2190                         cnt = cnt_inits_to;
2191                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2192                                 if (laddr->ifa == NULL) {
2193                                         continue;
2194                                 }
2195                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2196                                         continue;
2197                                 }
2198                                 if (sctp_is_address_in_scope(laddr->ifa,
2199                                     scope, 0) == 0) {
2200                                         continue;
2201                                 }
2202                                 if ((chunk_len != NULL) &&
2203                                     (padding_len != NULL) &&
2204                                     (*padding_len > 0)) {
2205                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2206                                         SCTP_BUF_LEN(m_at) += *padding_len;
2207                                         *chunk_len += *padding_len;
2208                                         *padding_len = 0;
2209                                 }
2210                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2211                                 cnt++;
2212                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2213                                         break;
2214                                 }
2215                         }
2216                 }
2217         }
2218         SCTP_IPI_ADDR_RUNLOCK();
2219         return (m_at);
2220 }
2221
2222 static struct sctp_ifa *
2223 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2224     uint8_t dest_is_loop,
2225     uint8_t dest_is_priv,
2226     sa_family_t fam)
2227 {
2228         uint8_t dest_is_global = 0;
2229
2230         /* dest_is_priv is true if destination is a private address */
2231         /* dest_is_loop is true if destination is a loopback addresses */
2232
2233         /**
2234          * Here we determine if its a preferred address. A preferred address
2235          * means it is the same scope or higher scope then the destination.
2236          * L = loopback, P = private, G = global
2237          * -----------------------------------------
2238          *    src    |  dest | result
2239          *  ----------------------------------------
2240          *     L     |    L  |    yes
2241          *  -----------------------------------------
2242          *     P     |    L  |    yes-v4 no-v6
2243          *  -----------------------------------------
2244          *     G     |    L  |    yes-v4 no-v6
2245          *  -----------------------------------------
2246          *     L     |    P  |    no
2247          *  -----------------------------------------
2248          *     P     |    P  |    yes
2249          *  -----------------------------------------
2250          *     G     |    P  |    no
2251          *   -----------------------------------------
2252          *     L     |    G  |    no
2253          *   -----------------------------------------
2254          *     P     |    G  |    no
2255          *    -----------------------------------------
2256          *     G     |    G  |    yes
2257          *    -----------------------------------------
2258          */
2259
2260         if (ifa->address.sa.sa_family != fam) {
2261                 /* forget mis-matched family */
2262                 return (NULL);
2263         }
2264         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2265                 dest_is_global = 1;
2266         }
2267         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2268         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2269         /* Ok the address may be ok */
2270 #ifdef INET6
2271         if (fam == AF_INET6) {
2272                 /* ok to use deprecated addresses? no lets not! */
2273                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2274                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2275                         return (NULL);
2276                 }
2277                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2278                         if (dest_is_loop) {
2279                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2280                                 return (NULL);
2281                         }
2282                 }
2283                 if (ifa->src_is_glob) {
2284                         if (dest_is_loop) {
2285                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2286                                 return (NULL);
2287                         }
2288                 }
2289         }
2290 #endif
2291         /*
2292          * Now that we know what is what, implement or table this could in
2293          * theory be done slicker (it used to be), but this is
2294          * straightforward and easier to validate :-)
2295          */
2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2297             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2299             dest_is_loop, dest_is_priv, dest_is_global);
2300
2301         if ((ifa->src_is_loop) && (dest_is_priv)) {
2302                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2303                 return (NULL);
2304         }
2305         if ((ifa->src_is_glob) && (dest_is_priv)) {
2306                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2307                 return (NULL);
2308         }
2309         if ((ifa->src_is_loop) && (dest_is_global)) {
2310                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2311                 return (NULL);
2312         }
2313         if ((ifa->src_is_priv) && (dest_is_global)) {
2314                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2315                 return (NULL);
2316         }
2317         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2318         /* its a preferred address */
2319         return (ifa);
2320 }
2321
2322 static struct sctp_ifa *
2323 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2324     uint8_t dest_is_loop,
2325     uint8_t dest_is_priv,
2326     sa_family_t fam)
2327 {
2328         uint8_t dest_is_global = 0;
2329
2330         /**
2331          * Here we determine if its a acceptable address. A acceptable
2332          * address means it is the same scope or higher scope but we can
2333          * allow for NAT which means its ok to have a global dest and a
2334          * private src.
2335          *
2336          * L = loopback, P = private, G = global
2337          * -----------------------------------------
2338          *  src    |  dest | result
2339          * -----------------------------------------
2340          *   L     |   L   |    yes
2341          *  -----------------------------------------
2342          *   P     |   L   |    yes-v4 no-v6
2343          *  -----------------------------------------
2344          *   G     |   L   |    yes
2345          * -----------------------------------------
2346          *   L     |   P   |    no
2347          * -----------------------------------------
2348          *   P     |   P   |    yes
2349          * -----------------------------------------
2350          *   G     |   P   |    yes - May not work
2351          * -----------------------------------------
2352          *   L     |   G   |    no
2353          * -----------------------------------------
2354          *   P     |   G   |    yes - May not work
2355          * -----------------------------------------
2356          *   G     |   G   |    yes
2357          * -----------------------------------------
2358          */
2359
2360         if (ifa->address.sa.sa_family != fam) {
2361                 /* forget non matching family */
2362                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2363                     ifa->address.sa.sa_family, fam);
2364                 return (NULL);
2365         }
2366         /* Ok the address may be ok */
2367         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2369             dest_is_loop, dest_is_priv);
2370         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2371                 dest_is_global = 1;
2372         }
2373 #ifdef INET6
2374         if (fam == AF_INET6) {
2375                 /* ok to use deprecated addresses? */
2376                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2377                         return (NULL);
2378                 }
2379                 if (ifa->src_is_priv) {
2380                         /* Special case, linklocal to loop */
2381                         if (dest_is_loop)
2382                                 return (NULL);
2383                 }
2384         }
2385 #endif
2386         /*
2387          * Now that we know what is what, implement our table. This could in
2388          * theory be done slicker (it used to be), but this is
2389          * straightforward and easier to validate :-)
2390          */
2391         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2392             ifa->src_is_loop,
2393             dest_is_priv);
2394         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2395                 return (NULL);
2396         }
2397         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2398             ifa->src_is_loop,
2399             dest_is_global);
2400         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2401                 return (NULL);
2402         }
2403         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2404         /* its an acceptable address */
2405         return (ifa);
2406 }
2407
2408 int
2409 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2410 {
2411         struct sctp_laddr *laddr;
2412
2413         if (stcb == NULL) {
2414                 /* There are no restrictions, no TCB :-) */
2415                 return (0);
2416         }
2417         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2418                 if (laddr->ifa == NULL) {
2419                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2420                             __func__);
2421                         continue;
2422                 }
2423                 if (laddr->ifa == ifa) {
2424                         /* Yes it is on the list */
2425                         return (1);
2426                 }
2427         }
2428         return (0);
2429 }
2430
2431
2432 int
2433 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2434 {
2435         struct sctp_laddr *laddr;
2436
2437         if (ifa == NULL)
2438                 return (0);
2439         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2440                 if (laddr->ifa == NULL) {
2441                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2442                             __func__);
2443                         continue;
2444                 }
2445                 if ((laddr->ifa == ifa) && laddr->action == 0)
2446                         /* same pointer */
2447                         return (1);
2448         }
2449         return (0);
2450 }
2451
2452
2453
2454 static struct sctp_ifa *
2455 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2456     sctp_route_t * ro,
2457     uint32_t vrf_id,
2458     int non_asoc_addr_ok,
2459     uint8_t dest_is_priv,
2460     uint8_t dest_is_loop,
2461     sa_family_t fam)
2462 {
2463         struct sctp_laddr *laddr, *starting_point;
2464         void *ifn;
2465         int resettotop = 0;
2466         struct sctp_ifn *sctp_ifn;
2467         struct sctp_ifa *sctp_ifa, *sifa;
2468         struct sctp_vrf *vrf;
2469         uint32_t ifn_index;
2470
2471         vrf = sctp_find_vrf(vrf_id);
2472         if (vrf == NULL)
2473                 return (NULL);
2474
2475         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2476         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2477         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2478         /*
2479          * first question, is the ifn we will emit on in our list, if so, we
2480          * want such an address. Note that we first looked for a preferred
2481          * address.
2482          */
2483         if (sctp_ifn) {
2484                 /* is a preferred one on the interface we route out? */
2485                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2486 #ifdef INET
2487                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2488                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2489                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2490                                 continue;
2491                         }
2492 #endif
2493 #ifdef INET6
2494                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2495                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2496                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2497                                 continue;
2498                         }
2499 #endif
2500                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2501                             (non_asoc_addr_ok == 0))
2502                                 continue;
2503                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2504                             dest_is_loop,
2505                             dest_is_priv, fam);
2506                         if (sifa == NULL)
2507                                 continue;
2508                         if (sctp_is_addr_in_ep(inp, sifa)) {
2509                                 atomic_add_int(&sifa->refcount, 1);
2510                                 return (sifa);
2511                         }
2512                 }
2513         }
2514         /*
2515          * ok, now we now need to find one on the list of the addresses. We
2516          * can't get one on the emitting interface so let's find first a
2517          * preferred one. If not that an acceptable one otherwise... we
2518          * return NULL.
2519          */
2520         starting_point = inp->next_addr_touse;
2521 once_again:
2522         if (inp->next_addr_touse == NULL) {
2523                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2524                 resettotop = 1;
2525         }
2526         for (laddr = inp->next_addr_touse; laddr;
2527             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2528                 if (laddr->ifa == NULL) {
2529                         /* address has been removed */
2530                         continue;
2531                 }
2532                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2533                         /* address is being deleted */
2534                         continue;
2535                 }
2536                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2537                     dest_is_priv, fam);
2538                 if (sifa == NULL)
2539                         continue;
2540                 atomic_add_int(&sifa->refcount, 1);
2541                 return (sifa);
2542         }
2543         if (resettotop == 0) {
2544                 inp->next_addr_touse = NULL;
2545                 goto once_again;
2546         }
2547         inp->next_addr_touse = starting_point;
2548         resettotop = 0;
2549 once_again_too:
2550         if (inp->next_addr_touse == NULL) {
2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2552                 resettotop = 1;
2553         }
2554         /* ok, what about an acceptable address in the inp */
2555         for (laddr = inp->next_addr_touse; laddr;
2556             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2557                 if (laddr->ifa == NULL) {
2558                         /* address has been removed */
2559                         continue;
2560                 }
2561                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2562                         /* address is being deleted */
2563                         continue;
2564                 }
2565                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2566                     dest_is_priv, fam);
2567                 if (sifa == NULL)
2568                         continue;
2569                 atomic_add_int(&sifa->refcount, 1);
2570                 return (sifa);
2571         }
2572         if (resettotop == 0) {
2573                 inp->next_addr_touse = NULL;
2574                 goto once_again_too;
2575         }
2576         /*
2577          * no address bound can be a source for the destination we are in
2578          * trouble
2579          */
2580         return (NULL);
2581 }
2582
2583
2584
2585 static struct sctp_ifa *
2586 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2587     struct sctp_tcb *stcb,
2588     sctp_route_t * ro,
2589     uint32_t vrf_id,
2590     uint8_t dest_is_priv,
2591     uint8_t dest_is_loop,
2592     int non_asoc_addr_ok,
2593     sa_family_t fam)
2594 {
2595         struct sctp_laddr *laddr, *starting_point;
2596         void *ifn;
2597         struct sctp_ifn *sctp_ifn;
2598         struct sctp_ifa *sctp_ifa, *sifa;
2599         uint8_t start_at_beginning = 0;
2600         struct sctp_vrf *vrf;
2601         uint32_t ifn_index;
2602
2603         /*
2604          * first question, is the ifn we will emit on in our list, if so, we
2605          * want that one.
2606          */
2607         vrf = sctp_find_vrf(vrf_id);
2608         if (vrf == NULL)
2609                 return (NULL);
2610
2611         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2612         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2613         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2614
2615         /*
2616          * first question, is the ifn we will emit on in our list?  If so,
2617          * we want that one. First we look for a preferred. Second, we go
2618          * for an acceptable.
2619          */
2620         if (sctp_ifn) {
2621                 /* first try for a preferred address on the ep */
2622                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2623 #ifdef INET
2624                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2625                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2626                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2627                                 continue;
2628                         }
2629 #endif
2630 #ifdef INET6
2631                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2632                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2633                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2634                                 continue;
2635                         }
2636 #endif
2637                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2638                                 continue;
2639                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2640                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2641                                 if (sifa == NULL)
2642                                         continue;
2643                                 if (((non_asoc_addr_ok == 0) &&
2644                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2645                                     (non_asoc_addr_ok &&
2646                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2647                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2648                                         /* on the no-no list */
2649                                         continue;
2650                                 }
2651                                 atomic_add_int(&sifa->refcount, 1);
2652                                 return (sifa);
2653                         }
2654                 }
2655                 /* next try for an acceptable address on the ep */
2656                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2657 #ifdef INET
2658                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2659                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2660                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2661                                 continue;
2662                         }
2663 #endif
2664 #ifdef INET6
2665                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2666                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2667                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2668                                 continue;
2669                         }
2670 #endif
2671                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2672                                 continue;
2673                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2674                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2675                                 if (sifa == NULL)
2676                                         continue;
2677                                 if (((non_asoc_addr_ok == 0) &&
2678                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                                     (non_asoc_addr_ok &&
2680                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                                         /* on the no-no list */
2683                                         continue;
2684                                 }
2685                                 atomic_add_int(&sifa->refcount, 1);
2686                                 return (sifa);
2687                         }
2688                 }
2689
2690         }
2691         /*
2692          * if we can't find one like that then we must look at all addresses
2693          * bound to pick one at first preferable then secondly acceptable.
2694          */
2695         starting_point = stcb->asoc.last_used_address;
2696 sctp_from_the_top:
2697         if (stcb->asoc.last_used_address == NULL) {
2698                 start_at_beginning = 1;
2699                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2700         }
2701         /* search beginning with the last used address */
2702         for (laddr = stcb->asoc.last_used_address; laddr;
2703             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2704                 if (laddr->ifa == NULL) {
2705                         /* address has been removed */
2706                         continue;
2707                 }
2708                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2709                         /* address is being deleted */
2710                         continue;
2711                 }
2712                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2713                 if (sifa == NULL)
2714                         continue;
2715                 if (((non_asoc_addr_ok == 0) &&
2716                     (sctp_is_addr_restricted(stcb, sifa))) ||
2717                     (non_asoc_addr_ok &&
2718                     (sctp_is_addr_restricted(stcb, sifa)) &&
2719                     (!sctp_is_addr_pending(stcb, sifa)))) {
2720                         /* on the no-no list */
2721                         continue;
2722                 }
2723                 stcb->asoc.last_used_address = laddr;
2724                 atomic_add_int(&sifa->refcount, 1);
2725                 return (sifa);
2726         }
2727         if (start_at_beginning == 0) {
2728                 stcb->asoc.last_used_address = NULL;
2729                 goto sctp_from_the_top;
2730         }
2731         /* now try for any higher scope than the destination */
2732         stcb->asoc.last_used_address = starting_point;
2733         start_at_beginning = 0;
2734 sctp_from_the_top2:
2735         if (stcb->asoc.last_used_address == NULL) {
2736                 start_at_beginning = 1;
2737                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2738         }
2739         /* search beginning with the last used address */
2740         for (laddr = stcb->asoc.last_used_address; laddr;
2741             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2742                 if (laddr->ifa == NULL) {
2743                         /* address has been removed */
2744                         continue;
2745                 }
2746                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2747                         /* address is being deleted */
2748                         continue;
2749                 }
2750                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2751                     dest_is_priv, fam);
2752                 if (sifa == NULL)
2753                         continue;
2754                 if (((non_asoc_addr_ok == 0) &&
2755                     (sctp_is_addr_restricted(stcb, sifa))) ||
2756                     (non_asoc_addr_ok &&
2757                     (sctp_is_addr_restricted(stcb, sifa)) &&
2758                     (!sctp_is_addr_pending(stcb, sifa)))) {
2759                         /* on the no-no list */
2760                         continue;
2761                 }
2762                 stcb->asoc.last_used_address = laddr;
2763                 atomic_add_int(&sifa->refcount, 1);
2764                 return (sifa);
2765         }
2766         if (start_at_beginning == 0) {
2767                 stcb->asoc.last_used_address = NULL;
2768                 goto sctp_from_the_top2;
2769         }
2770         return (NULL);
2771 }
2772
2773 static struct sctp_ifa *
2774 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2775     struct sctp_inpcb *inp,
2776     struct sctp_tcb *stcb,
2777     int non_asoc_addr_ok,
2778     uint8_t dest_is_loop,
2779     uint8_t dest_is_priv,
2780     int addr_wanted,
2781     sa_family_t fam,
2782     sctp_route_t * ro
2783 )
2784 {
2785         struct sctp_ifa *ifa, *sifa;
2786         int num_eligible_addr = 0;
2787
2788 #ifdef INET6
2789         struct sockaddr_in6 sin6, lsa6;
2790
2791         if (fam == AF_INET6) {
2792                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2793                 (void)sa6_recoverscope(&sin6);
2794         }
2795 #endif                          /* INET6 */
2796         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2797 #ifdef INET
2798                 if ((ifa->address.sa.sa_family == AF_INET) &&
2799                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2800                     &ifa->address.sin.sin_addr) != 0)) {
2801                         continue;
2802                 }
2803 #endif
2804 #ifdef INET6
2805                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2806                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2807                     &ifa->address.sin6.sin6_addr) != 0)) {
2808                         continue;
2809                 }
2810 #endif
2811                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2812                     (non_asoc_addr_ok == 0))
2813                         continue;
2814                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2815                     dest_is_priv, fam);
2816                 if (sifa == NULL)
2817                         continue;
2818 #ifdef INET6
2819                 if (fam == AF_INET6 &&
2820                     dest_is_loop &&
2821                     sifa->src_is_loop && sifa->src_is_priv) {
2822                         /*
2823                          * don't allow fe80::1 to be a src on loop ::1, we
2824                          * don't list it to the peer so we will get an
2825                          * abort.
2826                          */
2827                         continue;
2828                 }
2829                 if (fam == AF_INET6 &&
2830                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2831                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2832                         /*
2833                          * link-local <-> link-local must belong to the same
2834                          * scope.
2835                          */
2836                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2837                         (void)sa6_recoverscope(&lsa6);
2838                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2839                                 continue;
2840                         }
2841                 }
2842 #endif                          /* INET6 */
2843
2844                 /*
2845                  * Check if the IPv6 address matches to next-hop. In the
2846                  * mobile case, old IPv6 address may be not deleted from the
2847                  * interface. Then, the interface has previous and new
2848                  * addresses.  We should use one corresponding to the
2849                  * next-hop.  (by micchie)
2850                  */
2851 #ifdef INET6
2852                 if (stcb && fam == AF_INET6 &&
2853                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2854                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2855                             == 0) {
2856                                 continue;
2857                         }
2858                 }
2859 #endif
2860 #ifdef INET
2861                 /* Avoid topologically incorrect IPv4 address */
2862                 if (stcb && fam == AF_INET &&
2863                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2864                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2865                                 continue;
2866                         }
2867                 }
2868 #endif
2869                 if (stcb) {
2870                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2871                                 continue;
2872                         }
2873                         if (((non_asoc_addr_ok == 0) &&
2874                             (sctp_is_addr_restricted(stcb, sifa))) ||
2875                             (non_asoc_addr_ok &&
2876                             (sctp_is_addr_restricted(stcb, sifa)) &&
2877                             (!sctp_is_addr_pending(stcb, sifa)))) {
2878                                 /*
2879                                  * It is restricted for some reason..
2880                                  * probably not yet added.
2881                                  */
2882                                 continue;
2883                         }
2884                 }
2885                 if (num_eligible_addr >= addr_wanted) {
2886                         return (sifa);
2887                 }
2888                 num_eligible_addr++;
2889         }
2890         return (NULL);
2891 }
2892
2893
2894 static int
2895 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2896     struct sctp_inpcb *inp,
2897     struct sctp_tcb *stcb,
2898     int non_asoc_addr_ok,
2899     uint8_t dest_is_loop,
2900     uint8_t dest_is_priv,
2901     sa_family_t fam)
2902 {
2903         struct sctp_ifa *ifa, *sifa;
2904         int num_eligible_addr = 0;
2905
2906         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2907 #ifdef INET
2908                 if ((ifa->address.sa.sa_family == AF_INET) &&
2909                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2910                     &ifa->address.sin.sin_addr) != 0)) {
2911                         continue;
2912                 }
2913 #endif
2914 #ifdef INET6
2915                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2916                     (stcb != NULL) &&
2917                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2918                     &ifa->address.sin6.sin6_addr) != 0)) {
2919                         continue;
2920                 }
2921 #endif
2922                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2923                     (non_asoc_addr_ok == 0)) {
2924                         continue;
2925                 }
2926                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2927                     dest_is_priv, fam);
2928                 if (sifa == NULL) {
2929                         continue;
2930                 }
2931                 if (stcb) {
2932                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2933                                 continue;
2934                         }
2935                         if (((non_asoc_addr_ok == 0) &&
2936                             (sctp_is_addr_restricted(stcb, sifa))) ||
2937                             (non_asoc_addr_ok &&
2938                             (sctp_is_addr_restricted(stcb, sifa)) &&
2939                             (!sctp_is_addr_pending(stcb, sifa)))) {
2940                                 /*
2941                                  * It is restricted for some reason..
2942                                  * probably not yet added.
2943                                  */
2944                                 continue;
2945                         }
2946                 }
2947                 num_eligible_addr++;
2948         }
2949         return (num_eligible_addr);
2950 }
2951
2952 static struct sctp_ifa *
2953 sctp_choose_boundall(struct sctp_inpcb *inp,
2954     struct sctp_tcb *stcb,
2955     struct sctp_nets *net,
2956     sctp_route_t * ro,
2957     uint32_t vrf_id,
2958     uint8_t dest_is_priv,
2959     uint8_t dest_is_loop,
2960     int non_asoc_addr_ok,
2961     sa_family_t fam)
2962 {
2963         int cur_addr_num = 0, num_preferred = 0;
2964         void *ifn;
2965         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2966         struct sctp_ifa *sctp_ifa, *sifa;
2967         uint32_t ifn_index;
2968         struct sctp_vrf *vrf;
2969
2970 #ifdef INET
2971         int retried = 0;
2972
2973 #endif
2974
2975         /*-
2976          * For boundall we can use any address in the association.
2977          * If non_asoc_addr_ok is set we can use any address (at least in
2978          * theory). So we look for preferred addresses first. If we find one,
2979          * we use it. Otherwise we next try to get an address on the
2980          * interface, which we should be able to do (unless non_asoc_addr_ok
2981          * is false and we are routed out that way). In these cases where we
2982          * can't use the address of the interface we go through all the
2983          * ifn's looking for an address we can use and fill that in. Punting
2984          * means we send back address 0, which will probably cause problems
2985          * actually since then IP will fill in the address of the route ifn,
2986          * which means we probably already rejected it.. i.e. here comes an
2987          * abort :-<.
2988          */
2989         vrf = sctp_find_vrf(vrf_id);
2990         if (vrf == NULL)
2991                 return (NULL);
2992
2993         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2994         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2995         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2996         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2997         if (sctp_ifn == NULL) {
2998                 /* ?? We don't have this guy ?? */
2999                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3000                 goto bound_all_plan_b;
3001         }
3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3003             ifn_index, sctp_ifn->ifn_name);
3004
3005         if (net) {
3006                 cur_addr_num = net->indx_of_eligible_next_to_use;
3007         }
3008         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3009             inp, stcb,
3010             non_asoc_addr_ok,
3011             dest_is_loop,
3012             dest_is_priv, fam);
3013         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3014             num_preferred, sctp_ifn->ifn_name);
3015         if (num_preferred == 0) {
3016                 /*
3017                  * no eligible addresses, we must use some other interface
3018                  * address if we can find one.
3019                  */
3020                 goto bound_all_plan_b;
3021         }
3022         /*
3023          * Ok we have num_eligible_addr set with how many we can use, this
3024          * may vary from call to call due to addresses being deprecated
3025          * etc..
3026          */
3027         if (cur_addr_num >= num_preferred) {
3028                 cur_addr_num = 0;
3029         }
3030         /*
3031          * select the nth address from the list (where cur_addr_num is the
3032          * nth) and 0 is the first one, 1 is the second one etc...
3033          */
3034         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3035
3036         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3037             dest_is_priv, cur_addr_num, fam, ro);
3038
3039         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3040         if (sctp_ifa) {
3041                 atomic_add_int(&sctp_ifa->refcount, 1);
3042                 if (net) {
3043                         /* save off where the next one we will want */
3044                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3045                 }
3046                 return (sctp_ifa);
3047         }
3048         /*
3049          * plan_b: Look at all interfaces and find a preferred address. If
3050          * no preferred fall through to plan_c.
3051          */
3052 bound_all_plan_b:
3053         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3054         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3056                     sctp_ifn->ifn_name);
3057                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3058                         /* wrong base scope */
3059                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3060                         continue;
3061                 }
3062                 if ((sctp_ifn == looked_at) && looked_at) {
3063                         /* already looked at this guy */
3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3065                         continue;
3066                 }
3067                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3068                     dest_is_loop, dest_is_priv, fam);
3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3070                     "Found ifn:%p %d preferred source addresses\n",
3071                     ifn, num_preferred);
3072                 if (num_preferred == 0) {
3073                         /* None on this interface. */
3074                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3075                         continue;
3076                 }
3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081                 /*
3082                  * Ok we have num_eligible_addr set with how many we can
3083                  * use, this may vary from call to call due to addresses
3084                  * being deprecated etc..
3085                  */
3086                 if (cur_addr_num >= num_preferred) {
3087                         cur_addr_num = 0;
3088                 }
3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090                     dest_is_priv, cur_addr_num, fam, ro);
3091                 if (sifa == NULL)
3092                         continue;
3093                 if (net) {
3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096                             cur_addr_num);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101                 }
3102                 atomic_add_int(&sifa->refcount, 1);
3103                 return (sifa);
3104         }
3105 #ifdef INET
3106 again_with_private_addresses_allowed:
3107 #endif
3108         /* plan_c: do we have an acceptable address on the emit interface */
3109         sifa = NULL;
3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111         if (emit_ifn == NULL) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113                 goto plan_d;
3114         }
3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117 #ifdef INET
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125 #ifdef INET6
3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130                         continue;
3131                 }
3132 #endif
3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134                     (non_asoc_addr_ok == 0)) {
3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136                         continue;
3137                 }
3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139                     dest_is_priv, fam);
3140                 if (sifa == NULL) {
3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142                         continue;
3143                 }
3144                 if (stcb) {
3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147                                 sifa = NULL;
3148                                 continue;
3149                         }
3150                         if (((non_asoc_addr_ok == 0) &&
3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
3152                             (non_asoc_addr_ok &&
3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
3155                                 /*
3156                                  * It is restricted for some reason..
3157                                  * probably not yet added.
3158                                  */
3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3160                                 sifa = NULL;
3161                                 continue;
3162                         }
3163                 }
3164                 atomic_add_int(&sifa->refcount, 1);
3165                 goto out;
3166         }
3167 plan_d:
3168         /*
3169          * plan_d: We are in trouble. No preferred address on the emit
3170          * interface. And not even a preferred address on all interfaces. Go
3171          * out and see if we can find an acceptable address somewhere
3172          * amongst all interfaces.
3173          */
3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177                         /* wrong base scope */
3178                         continue;
3179                 }
3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181 #ifdef INET
3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3185                                 continue;
3186                         }
3187 #endif
3188 #ifdef INET6
3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192                                 continue;
3193                         }
3194 #endif
3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196                             (non_asoc_addr_ok == 0))
3197                                 continue;
3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199                             dest_is_loop,
3200                             dest_is_priv, fam);
3201                         if (sifa == NULL)
3202                                 continue;
3203                         if (stcb) {
3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205                                         sifa = NULL;
3206                                         continue;
3207                                 }
3208                                 if (((non_asoc_addr_ok == 0) &&
3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3210                                     (non_asoc_addr_ok &&
3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3213                                         /*
3214                                          * It is restricted for some
3215                                          * reason.. probably not yet added.
3216                                          */
3217                                         sifa = NULL;
3218                                         continue;
3219                                 }
3220                         }
3221                         goto out;
3222                 }
3223         }
3224 #ifdef INET
3225         if (stcb) {
3226                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3227                         stcb->asoc.scope.ipv4_local_scope = 1;
3228                         retried = 1;
3229                         goto again_with_private_addresses_allowed;
3230                 } else if (retried == 1) {
3231                         stcb->asoc.scope.ipv4_local_scope = 0;
3232                 }
3233         }
3234 #endif
3235 out:
3236 #ifdef INET
3237         if (sifa) {
3238                 if (retried == 1) {
3239                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3240                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3241                                         /* wrong base scope */
3242                                         continue;
3243                                 }
3244                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3245                                         struct sctp_ifa *tmp_sifa;
3246
3247 #ifdef INET
3248                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3249                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3250                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3251                                                 continue;
3252                                         }
3253 #endif
3254 #ifdef INET6
3255                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3256                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3257                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3258                                                 continue;
3259                                         }
3260 #endif
3261                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3262                                             (non_asoc_addr_ok == 0))
3263                                                 continue;
3264                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3265                                             dest_is_loop,
3266                                             dest_is_priv, fam);
3267                                         if (tmp_sifa == NULL) {
3268                                                 continue;
3269                                         }
3270                                         if (tmp_sifa == sifa) {
3271                                                 continue;
3272                                         }
3273                                         if (stcb) {
3274                                                 if (sctp_is_address_in_scope(tmp_sifa,
3275                                                     &stcb->asoc.scope, 0) == 0) {
3276                                                         continue;
3277                                                 }
3278                                                 if (((non_asoc_addr_ok == 0) &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3280                                                     (non_asoc_addr_ok &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3282                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3283                                                         /*
3284                                                          * It is restricted
3285                                                          * for some reason..
3286                                                          * probably not yet
3287                                                          * added.
3288                                                          */
3289                                                         continue;
3290                                                 }
3291                                         }
3292                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3293                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3294                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3295                                         }
3296                                 }
3297                         }
3298                 }
3299                 atomic_add_int(&sifa->refcount, 1);
3300         }
3301 #endif
3302         return (sifa);
3303 }
3304
3305
3306
3307 /* tcb may be NULL */
3308 struct sctp_ifa *
3309 sctp_source_address_selection(struct sctp_inpcb *inp,
3310     struct sctp_tcb *stcb,
3311     sctp_route_t * ro,
3312     struct sctp_nets *net,
3313     int non_asoc_addr_ok, uint32_t vrf_id)
3314 {
3315         struct sctp_ifa *answer;
3316         uint8_t dest_is_priv, dest_is_loop;
3317         sa_family_t fam;
3318
3319 #ifdef INET
3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325
3326 #endif
3327
3328         /**
3329          * Rules:
3330          * - Find the route if needed, cache if I can.
3331          * - Look at interface address in route, Is it in the bound list. If so we
3332          *   have the best source.
3333          * - If not we must rotate amongst the addresses.
3334          *
3335          * Cavets and issues
3336          *
3337          * Do we need to pay attention to scope. We can have a private address
3338          * or a global address we are sourcing or sending to. So if we draw
3339          * it out
3340          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3341          * For V4
3342          * ------------------------------------------
3343          *      source     *      dest  *  result
3344          * -----------------------------------------
3345          * <a>  Private    *    Global  *  NAT
3346          * -----------------------------------------
3347          * <b>  Private    *    Private *  No problem
3348          * -----------------------------------------
3349          * <c>  Global     *    Private *  Huh, How will this work?
3350          * -----------------------------------------
3351          * <d>  Global     *    Global  *  No Problem
3352          *------------------------------------------
3353          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3354          * For V6
3355          *------------------------------------------
3356          *      source     *      dest  *  result
3357          * -----------------------------------------
3358          * <a>  Linklocal  *    Global  *
3359          * -----------------------------------------
3360          * <b>  Linklocal  * Linklocal  *  No problem
3361          * -----------------------------------------
3362          * <c>  Global     * Linklocal  *  Huh, How will this work?
3363          * -----------------------------------------
3364          * <d>  Global     *    Global  *  No Problem
3365          *------------------------------------------
3366          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3367          *
3368          * And then we add to that what happens if there are multiple addresses
3369          * assigned to an interface. Remember the ifa on a ifn is a linked
3370          * list of addresses. So one interface can have more than one IP
3371          * address. What happens if we have both a private and a global
3372          * address? Do we then use context of destination to sort out which
3373          * one is best? And what about NAT's sending P->G may get you a NAT
3374          * translation, or should you select the G thats on the interface in
3375          * preference.
3376          *
3377          * Decisions:
3378          *
3379          * - count the number of addresses on the interface.
3380          * - if it is one, no problem except case <c>.
3381          *   For <a> we will assume a NAT out there.
3382          * - if there are more than one, then we need to worry about scope P
3383          *   or G. We should prefer G -> G and P -> P if possible.
3384          *   Then as a secondary fall back to mixed types G->P being a last
3385          *   ditch one.
3386          * - The above all works for bound all, but bound specific we need to
3387          *   use the same concept but instead only consider the bound
3388          *   addresses. If the bound set is NOT assigned to the interface then
3389          *   we must use rotation amongst the bound addresses..
3390          */
3391         if (ro->ro_rt == NULL) {
3392                 /*
3393                  * Need a route to cache.
3394                  */
3395                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3396         }
3397         if (ro->ro_rt == NULL) {
3398                 return (NULL);
3399         }
3400         fam = ro->ro_dst.sa_family;
3401         dest_is_priv = dest_is_loop = 0;
3402         /* Setup our scopes for the destination */
3403         switch (fam) {
3404 #ifdef INET
3405         case AF_INET:
3406                 /* Scope based on outbound address */
3407                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3408                         dest_is_loop = 1;
3409                         if (net != NULL) {
3410                                 /* mark it as local */
3411                                 net->addr_is_local = 1;
3412                         }
3413                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3414                         dest_is_priv = 1;
3415                 }
3416                 break;
3417 #endif
3418 #ifdef INET6
3419         case AF_INET6:
3420                 /* Scope based on outbound address */
3421                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3422                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3423                         /*
3424                          * If the address is a loopback address, which
3425                          * consists of "::1" OR "fe80::1%lo0", we are
3426                          * loopback scope. But we don't use dest_is_priv
3427                          * (link local addresses).
3428                          */
3429                         dest_is_loop = 1;
3430                         if (net != NULL) {
3431                                 /* mark it as local */
3432                                 net->addr_is_local = 1;
3433                         }
3434                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3435                         dest_is_priv = 1;
3436                 }
3437                 break;
3438 #endif
3439         }
3440         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3441         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3442         SCTP_IPI_ADDR_RLOCK();
3443         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3444                 /*
3445                  * Bound all case
3446                  */
3447                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3448                     dest_is_priv, dest_is_loop,
3449                     non_asoc_addr_ok, fam);
3450                 SCTP_IPI_ADDR_RUNLOCK();
3451                 return (answer);
3452         }
3453         /*
3454          * Subset bound case
3455          */
3456         if (stcb) {
3457                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3458                     vrf_id, dest_is_priv,
3459                     dest_is_loop,
3460                     non_asoc_addr_ok, fam);
3461         } else {
3462                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3463                     non_asoc_addr_ok,
3464                     dest_is_priv,
3465                     dest_is_loop, fam);
3466         }
3467         SCTP_IPI_ADDR_RUNLOCK();
3468         return (answer);
3469 }
3470
3471 static int
3472 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3473 {
3474         struct cmsghdr cmh;
3475         int tlen, at, found;
3476         struct sctp_sndinfo sndinfo;
3477         struct sctp_prinfo prinfo;
3478         struct sctp_authinfo authinfo;
3479
3480         tlen = SCTP_BUF_LEN(control);
3481         at = 0;
3482         found = 0;
3483         /*
3484          * Independent of how many mbufs, find the c_type inside the control
3485          * structure and copy out the data.
3486          */
3487         while (at < tlen) {
3488                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if (((int)cmh.cmsg_len + at) > tlen) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3502                     ((c_type == cmh.cmsg_type) ||
3503                     ((c_type == SCTP_SNDRCV) &&
3504                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3505                     (cmh.cmsg_type == SCTP_PRINFO) ||
3506                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3507                         if (c_type == cmh.cmsg_type) {
3508                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3509                                         return (found);
3510                                 }
3511                                 /* It is exactly what we want. Copy it out. */
3512                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3513                                 return (1);
3514                         } else {
3515                                 struct sctp_sndrcvinfo *sndrcvinfo;
3516
3517                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3518                                 if (found == 0) {
3519                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3520                                                 return (found);
3521                                         }
3522                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3523                                 }
3524                                 switch (cmh.cmsg_type) {
3525                                 case SCTP_SNDINFO:
3526                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3527                                                 return (found);
3528                                         }
3529                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3530                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3531                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3532                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3533                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3534                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3535                                         break;
3536                                 case SCTP_PRINFO:
3537                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3538                                                 return (found);
3539                                         }
3540                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3541                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3542                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3543                                         } else {
3544                                                 sndrcvinfo->sinfo_timetolive = 0;
3545                                         }
3546                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3547                                         break;
3548                                 case SCTP_AUTHINFO:
3549                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3550                                                 return (found);
3551                                         }
3552                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3553                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3554                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3555                                         break;
3556                                 default:
3557                                         return (found);
3558                                 }
3559                                 found = 1;
3560                         }
3561                 }
3562                 at += CMSG_ALIGN(cmh.cmsg_len);
3563         }
3564         return (found);
3565 }
3566
3567 static int
3568 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3569 {
3570         struct cmsghdr cmh;
3571         int tlen, at;
3572         struct sctp_initmsg initmsg;
3573
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576
3577 #endif
3578 #ifdef INET6
3579         struct sockaddr_in6 sin6;
3580
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (1);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (1);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (1);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604                         case SCTP_INIT:
3605                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3606                                         *error = EINVAL;
3607                                         return (1);
3608                                 }
3609                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3610                                 if (initmsg.sinit_max_attempts)
3611                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3612                                 if (initmsg.sinit_num_ostreams)
3613                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3614                                 if (initmsg.sinit_max_instreams)
3615                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3616                                 if (initmsg.sinit_max_init_timeo)
3617                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3618                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3619                                         struct sctp_stream_out *tmp_str;
3620                                         unsigned int i;
3621
3622 #if defined(SCTP_DETAILED_STR_STATS)
3623                                         int j;
3624
3625 #endif
3626
3627                                         /* Default is NOT correct */
3628                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3629                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3630                                         SCTP_TCB_UNLOCK(stcb);
3631                                         SCTP_MALLOC(tmp_str,
3632                                             struct sctp_stream_out *,
3633                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3634                                             SCTP_M_STRMO);
3635                                         SCTP_TCB_LOCK(stcb);
3636                                         if (tmp_str != NULL) {
3637                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3638                                                 stcb->asoc.strmout = tmp_str;
3639                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3640                                         } else {
3641                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3642                                         }
3643                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3644                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3645                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3646                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3647                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3648 #if defined(SCTP_DETAILED_STR_STATS)
3649                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3650                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3651                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3652                                                 }
3653 #else
3654                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3655                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3656 #endif
3657                                                 stcb->asoc.strmout[i].stream_no = i;
3658                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3659                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3660                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3661                                         }
3662                                 }
3663                                 break;
3664 #ifdef INET
3665                         case SCTP_DSTADDRV4:
3666                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3667                                         *error = EINVAL;
3668                                         return (1);
3669                                 }
3670                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3671                                 sin.sin_family = AF_INET;
3672                                 sin.sin_len = sizeof(struct sockaddr_in);
3673                                 sin.sin_port = stcb->rport;
3674                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3675                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3676                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3677                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3678                                         *error = EINVAL;
3679                                         return (1);
3680                                 }
3681                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3682                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3683                                         *error = ENOBUFS;
3684                                         return (1);
3685                                 }
3686                                 break;
3687 #endif
3688 #ifdef INET6
3689                         case SCTP_DSTADDRV6:
3690                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3691                                         *error = EINVAL;
3692                                         return (1);
3693                                 }
3694                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3695                                 sin6.sin6_family = AF_INET6;
3696                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3697                                 sin6.sin6_port = stcb->rport;
3698                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3699                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3700                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3701                                         *error = EINVAL;
3702                                         return (1);
3703                                 }
3704 #ifdef INET
3705                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3706                                         in6_sin6_2_sin(&sin, &sin6);
3707                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3708                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3709                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3710                                                 *error = EINVAL;
3711                                                 return (1);
3712                                         }
3713                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3714                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3715                                                 *error = ENOBUFS;
3716                                                 return (1);
3717                                         }
3718                                 } else
3719 #endif
3720                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3721                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3722                                         *error = ENOBUFS;
3723                                         return (1);
3724                                 }
3725                                 break;
3726 #endif
3727                         default:
3728                                 break;
3729                         }
3730                 }
3731                 at += CMSG_ALIGN(cmh.cmsg_len);
3732         }
3733         return (0);
3734 }
3735
3736 static struct sctp_tcb *
3737 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3738     uint16_t port,
3739     struct mbuf *control,
3740     struct sctp_nets **net_p,
3741     int *error)
3742 {
3743         struct cmsghdr cmh;
3744         int tlen, at;
3745         struct sctp_tcb *stcb;
3746         struct sockaddr *addr;
3747
3748 #ifdef INET
3749         struct sockaddr_in sin;
3750
3751 #endif
3752 #ifdef INET6
3753         struct sockaddr_in6 sin6;
3754
3755 #endif
3756
3757         tlen = SCTP_BUF_LEN(control);
3758         at = 0;
3759         while (at < tlen) {
3760                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3761                         /* There is not enough room for one more. */
3762                         *error = EINVAL;
3763                         return (NULL);
3764                 }
3765                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3766                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3767                         /* We dont't have a complete CMSG header. */
3768                         *error = EINVAL;
3769                         return (NULL);
3770                 }
3771                 if (((int)cmh.cmsg_len + at) > tlen) {
3772                         /* We don't have the complete CMSG. */
3773                         *error = EINVAL;
3774                         return (NULL);
3775                 }
3776                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3777                         switch (cmh.cmsg_type) {
3778 #ifdef INET
3779                         case SCTP_DSTADDRV4:
3780                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3781                                         *error = EINVAL;
3782                                         return (NULL);
3783                                 }
3784                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3785                                 sin.sin_family = AF_INET;
3786                                 sin.sin_len = sizeof(struct sockaddr_in);
3787                                 sin.sin_port = port;
3788                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3789                                 addr = (struct sockaddr *)&sin;
3790                                 break;
3791 #endif
3792 #ifdef INET6
3793                         case SCTP_DSTADDRV6:
3794                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3795                                         *error = EINVAL;
3796                                         return (NULL);
3797                                 }
3798                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3799                                 sin6.sin6_family = AF_INET6;
3800                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3801                                 sin6.sin6_port = port;
3802                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3803 #ifdef INET
3804                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3805                                         in6_sin6_2_sin(&sin, &sin6);
3806                                         addr = (struct sockaddr *)&sin;
3807                                 } else
3808 #endif
3809                                         addr = (struct sockaddr *)&sin6;
3810                                 break;
3811 #endif
3812                         default:
3813                                 addr = NULL;
3814                                 break;
3815                         }
3816                         if (addr) {
3817                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3818                                 if (stcb != NULL) {
3819                                         return (stcb);
3820                                 }
3821                         }
3822                 }
3823                 at += CMSG_ALIGN(cmh.cmsg_len);
3824         }
3825         return (NULL);
3826 }
3827
3828 static struct mbuf *
3829 sctp_add_cookie(struct mbuf *init, int init_offset,
3830     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3831 {
3832         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3833         struct sctp_state_cookie *stc;
3834         struct sctp_paramhdr *ph;
3835         uint8_t *foo;
3836         int sig_offset;
3837         uint16_t cookie_sz;
3838
3839         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3840             sizeof(struct sctp_paramhdr)), 0,
3841             M_NOWAIT, 1, MT_DATA);
3842         if (mret == NULL) {
3843                 return (NULL);
3844         }
3845         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3846         if (copy_init == NULL) {
3847                 sctp_m_freem(mret);
3848                 return (NULL);
3849         }
3850 #ifdef SCTP_MBUF_LOGGING
3851         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3852                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3853         }
3854 #endif
3855         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3856             M_NOWAIT);
3857         if (copy_initack == NULL) {
3858                 sctp_m_freem(mret);
3859                 sctp_m_freem(copy_init);
3860                 return (NULL);
3861         }
3862 #ifdef SCTP_MBUF_LOGGING
3863         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3864                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3865         }
3866 #endif
3867         /* easy side we just drop it on the end */
3868         ph = mtod(mret, struct sctp_paramhdr *);
3869         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3870             sizeof(struct sctp_paramhdr);
3871         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3872             sizeof(struct sctp_paramhdr));
3873         ph->param_type = htons(SCTP_STATE_COOKIE);
3874         ph->param_length = 0;   /* fill in at the end */
3875         /* Fill in the stc cookie data */
3876         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3877
3878         /* tack the INIT and then the INIT-ACK onto the chain */
3879         cookie_sz = 0;
3880         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881                 cookie_sz += SCTP_BUF_LEN(m_at);
3882                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3883                         SCTP_BUF_NEXT(m_at) = copy_init;
3884                         break;
3885                 }
3886         }
3887         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888                 cookie_sz += SCTP_BUF_LEN(m_at);
3889                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3890                         SCTP_BUF_NEXT(m_at) = copy_initack;
3891                         break;
3892                 }
3893         }
3894         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3895                 cookie_sz += SCTP_BUF_LEN(m_at);
3896                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3897                         break;
3898                 }
3899         }
3900         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3901         if (sig == NULL) {
3902                 /* no space, so free the entire chain */
3903                 sctp_m_freem(mret);
3904                 return (NULL);
3905         }
3906         SCTP_BUF_LEN(sig) = 0;
3907         SCTP_BUF_NEXT(m_at) = sig;
3908         sig_offset = 0;
3909         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3910         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3911         *signature = foo;
3912         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3913         cookie_sz += SCTP_SIGNATURE_SIZE;
3914         ph->param_length = htons(cookie_sz);
3915         return (mret);
3916 }
3917
3918
3919 static uint8_t
3920 sctp_get_ect(struct sctp_tcb *stcb)
3921 {
3922         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3923                 return (SCTP_ECT0_BIT);
3924         } else {
3925                 return (0);
3926         }
3927 }
3928
3929 #if defined(INET) || defined(INET6)
3930 static void
3931 sctp_handle_no_route(struct sctp_tcb *stcb,
3932     struct sctp_nets *net,
3933     int so_locked)
3934 {
3935         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3936
3937         if (net) {
3938                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3939                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3940                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3941                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3942                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3943                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3944                                     stcb, 0,
3945                                     (void *)net,
3946                                     so_locked);
3947                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3948                                 net->dest_state &= ~SCTP_ADDR_PF;
3949                         }
3950                 }
3951                 if (stcb) {
3952                         if (net == stcb->asoc.primary_destination) {
3953                                 /* need a new primary */
3954                                 struct sctp_nets *alt;
3955
3956                                 alt = sctp_find_alternate_net(stcb, net, 0);
3957                                 if (alt != net) {
3958                                         if (stcb->asoc.alternate) {
3959                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3960                                         }
3961                                         stcb->asoc.alternate = alt;
3962                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3963                                         if (net->ro._s_addr) {
3964                                                 sctp_free_ifa(net->ro._s_addr);
3965                                                 net->ro._s_addr = NULL;
3966                                         }
3967                                         net->src_addr_selected = 0;
3968                                 }
3969                         }
3970                 }
3971         }
3972 }
3973
3974 #endif
3975
3976 static int
3977 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3978     struct sctp_tcb *stcb,      /* may be NULL */
3979     struct sctp_nets *net,
3980     struct sockaddr *to,
3981     struct mbuf *m,
3982     uint32_t auth_offset,
3983     struct sctp_auth_chunk *auth,
3984     uint16_t auth_keyid,
3985     int nofragment_flag,
3986     int ecn_ok,
3987     int out_of_asoc_ok,
3988     uint16_t src_port,
3989     uint16_t dest_port,
3990     uint32_t v_tag,
3991     uint16_t port,
3992     union sctp_sockstore *over_addr,
3993     uint8_t mflowtype, uint32_t mflowid,
3994 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3995     int so_locked SCTP_UNUSED
3996 #else
3997     int so_locked
3998 #endif
3999 )
4000 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4001 {
4002         /**
4003          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4004          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4005          * - fill in the HMAC digest of any AUTH chunk in the packet.
4006          * - calculate and fill in the SCTP checksum.
4007          * - prepend an IP address header.
4008          * - if boundall use INADDR_ANY.
4009          * - if boundspecific do source address selection.
4010          * - set fragmentation option for ipV4.
4011          * - On return from IP output, check/adjust mtu size of output
4012          *   interface and smallest_mtu size as well.
4013          */
4014         /* Will need ifdefs around this */
4015         struct mbuf *newm;
4016         struct sctphdr *sctphdr;
4017         int packet_length;
4018         int ret;
4019
4020 #if defined(INET) || defined(INET6)
4021         uint32_t vrf_id;
4022
4023 #endif
4024 #if defined(INET) || defined(INET6)
4025         struct mbuf *o_pak;
4026         sctp_route_t *ro = NULL;
4027         struct udphdr *udp = NULL;
4028
4029 #endif
4030         uint8_t tos_value;
4031
4032 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4033         struct socket *so = NULL;
4034
4035 #endif
4036
4037         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4038                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4039                 sctp_m_freem(m);
4040                 return (EFAULT);
4041         }
4042 #if defined(INET) || defined(INET6)
4043         if (stcb) {
4044                 vrf_id = stcb->asoc.vrf_id;
4045         } else {
4046                 vrf_id = inp->def_vrf_id;
4047         }
4048 #endif
4049         /* fill in the HMAC digest for any AUTH chunk in the packet */
4050         if ((auth != NULL) && (stcb != NULL)) {
4051                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4052         }
4053         if (net) {
4054                 tos_value = net->dscp;
4055         } else if (stcb) {
4056                 tos_value = stcb->asoc.default_dscp;
4057         } else {
4058                 tos_value = inp->sctp_ep.default_dscp;
4059         }
4060
4061         switch (to->sa_family) {
4062 #ifdef INET
4063         case AF_INET:
4064                 {
4065                         struct ip *ip = NULL;
4066                         sctp_route_t iproute;
4067                         int len;
4068
4069                         len = SCTP_MIN_V4_OVERHEAD;
4070                         if (port) {
4071                                 len += sizeof(struct udphdr);
4072                         }
4073                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4074                         if (newm == NULL) {
4075                                 sctp_m_freem(m);
4076                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4077                                 return (ENOMEM);
4078                         }
4079                         SCTP_ALIGN_TO_END(newm, len);
4080                         SCTP_BUF_LEN(newm) = len;
4081                         SCTP_BUF_NEXT(newm) = m;
4082                         m = newm;
4083                         if (net != NULL) {
4084                                 m->m_pkthdr.flowid = net->flowid;
4085                                 M_HASHTYPE_SET(m, net->flowtype);
4086                         } else {
4087                                 m->m_pkthdr.flowid = mflowid;
4088                                 M_HASHTYPE_SET(m, mflowtype);
4089                         }
4090                         packet_length = sctp_calculate_len(m);
4091                         ip = mtod(m, struct ip *);
4092                         ip->ip_v = IPVERSION;
4093                         ip->ip_hl = (sizeof(struct ip) >> 2);
4094                         if (tos_value == 0) {
4095                                 /*
4096                                  * This means especially, that it is not set
4097                                  * at the SCTP layer. So use the value from
4098                                  * the IP layer.
4099                                  */
4100                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4101                         }
4102                         tos_value &= 0xfc;
4103                         if (ecn_ok) {
4104                                 tos_value |= sctp_get_ect(stcb);
4105                         }
4106                         if ((nofragment_flag) && (port == 0)) {
4107                                 ip->ip_off = htons(IP_DF);
4108                         } else {
4109                                 ip->ip_off = htons(0);
4110                         }
4111                         /* FreeBSD has a function for ip_id's */
4112                         ip_fillid(ip);
4113
4114                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4115                         ip->ip_len = htons(packet_length);
4116                         ip->ip_tos = tos_value;
4117                         if (port) {
4118                                 ip->ip_p = IPPROTO_UDP;
4119                         } else {
4120                                 ip->ip_p = IPPROTO_SCTP;
4121                         }
4122                         ip->ip_sum = 0;
4123                         if (net == NULL) {
4124                                 ro = &iproute;
4125                                 memset(&iproute, 0, sizeof(iproute));
4126                                 memcpy(&ro->ro_dst, to, to->sa_len);
4127                         } else {
4128                                 ro = (sctp_route_t *) & net->ro;
4129                         }
4130                         /* Now the address selection part */
4131                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4132
4133                         /* call the routine to select the src address */
4134                         if (net && out_of_asoc_ok == 0) {
4135                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4136                                         sctp_free_ifa(net->ro._s_addr);
4137                                         net->ro._s_addr = NULL;
4138                                         net->src_addr_selected = 0;
4139                                         if (ro->ro_rt) {
4140                                                 RTFREE(ro->ro_rt);
4141                                                 ro->ro_rt = NULL;
4142                                         }
4143                                 }
4144                                 if (net->src_addr_selected == 0) {
4145                                         /* Cache the source address */
4146                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4147                                             ro, net, 0,
4148                                             vrf_id);
4149                                         net->src_addr_selected = 1;
4150                                 }
4151                                 if (net->ro._s_addr == NULL) {
4152                                         /* No route to host */
4153                                         net->src_addr_selected = 0;
4154                                         sctp_handle_no_route(stcb, net, so_locked);
4155                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4156                                         sctp_m_freem(m);
4157                                         return (EHOSTUNREACH);
4158                                 }
4159                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4160                         } else {
4161                                 if (over_addr == NULL) {
4162                                         struct sctp_ifa *_lsrc;
4163
4164                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4165                                             net,
4166                                             out_of_asoc_ok,
4167                                             vrf_id);
4168                                         if (_lsrc == NULL) {
4169                                                 sctp_handle_no_route(stcb, net, so_locked);
4170                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4171                                                 sctp_m_freem(m);
4172                                                 return (EHOSTUNREACH);
4173                                         }
4174                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4175                                         sctp_free_ifa(_lsrc);
4176                                 } else {
4177                                         ip->ip_src = over_addr->sin.sin_addr;
4178                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4179                                 }
4180                         }
4181                         if (port) {
4182                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4183                                         sctp_handle_no_route(stcb, net, so_locked);
4184                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4185                                         sctp_m_freem(m);
4186                                         return (EHOSTUNREACH);
4187                                 }
4188                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4189                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4190                                 udp->uh_dport = port;
4191                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip)));
4192                                 if (V_udp_cksum) {
4193                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4194                                 } else {
4195                                         udp->uh_sum = 0;
4196                                 }
4197                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4198                         } else {
4199                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4200                         }
4201
4202                         sctphdr->src_port = src_port;
4203                         sctphdr->dest_port = dest_port;
4204                         sctphdr->v_tag = v_tag;
4205                         sctphdr->checksum = 0;
4206
4207                         /*
4208                          * If source address selection fails and we find no
4209                          * route then the ip_output should fail as well with
4210                          * a NO_ROUTE_TO_HOST type error. We probably should
4211                          * catch that somewhere and abort the association
4212                          * right away (assuming this is an INIT being sent).
4213                          */
4214                         if (ro->ro_rt == NULL) {
4215                                 /*
4216                                  * src addr selection failed to find a route
4217                                  * (or valid source addr), so we can't get
4218                                  * there from here (yet)!
4219                                  */
4220                                 sctp_handle_no_route(stcb, net, so_locked);
4221                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4222                                 sctp_m_freem(m);
4223                                 return (EHOSTUNREACH);
4224                         }
4225                         if (ro != &iproute) {
4226                                 memcpy(&iproute, ro, sizeof(*ro));
4227                         }
4228                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4229                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4230                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4231                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4232                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4233                             (void *)ro->ro_rt);
4234
4235                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4236                                 /* failed to prepend data, give up */
4237                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4238                                 sctp_m_freem(m);
4239                                 return (ENOMEM);
4240                         }
4241                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4242                         if (port) {
4243 #if defined(SCTP_WITH_NO_CSUM)
4244                                 SCTP_STAT_INCR(sctps_sendnocrc);
4245 #else
4246                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4247                                 SCTP_STAT_INCR(sctps_sendswcrc);
4248 #endif
4249                                 if (V_udp_cksum) {
4250                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4251                                 }
4252                         } else {
4253 #if defined(SCTP_WITH_NO_CSUM)
4254                                 SCTP_STAT_INCR(sctps_sendnocrc);
4255 #else
4256                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4257                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4258                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4259 #endif
4260                         }
4261 #ifdef SCTP_PACKET_LOGGING
4262                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4263                                 sctp_packet_log(o_pak);
4264 #endif
4265                         /* send it out.  table id is taken from stcb */
4266 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4267                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4268                                 so = SCTP_INP_SO(inp);
4269                                 SCTP_SOCKET_UNLOCK(so, 0);
4270                         }
4271 #endif
4272                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4273 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4274                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4275                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4276                                 SCTP_TCB_UNLOCK(stcb);
4277                                 SCTP_SOCKET_LOCK(so, 0);
4278                                 SCTP_TCB_LOCK(stcb);
4279                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4280                         }
4281 #endif
4282                         SCTP_STAT_INCR(sctps_sendpackets);
4283                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4284                         if (ret)
4285                                 SCTP_STAT_INCR(sctps_senderrors);
4286
4287                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4288                         if (net == NULL) {
4289                                 /* free tempy routes */
4290                                 RO_RTFREE(ro);
4291                         } else {
4292                                 /*
4293                                  * PMTU check versus smallest asoc MTU goes
4294                                  * here
4295                                  */
4296                                 if ((ro->ro_rt != NULL) &&
4297                                     (net->ro._s_addr)) {
4298                                         uint32_t mtu;
4299
4300                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4301                                         if (net->port) {
4302                                                 mtu -= sizeof(struct udphdr);
4303                                         }
4304                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4305                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4306                                                 net->mtu = mtu;
4307                                         }
4308                                 } else if (ro->ro_rt == NULL) {
4309                                         /* route was freed */
4310                                         if (net->ro._s_addr &&
4311                                             net->src_addr_selected) {
4312                                                 sctp_free_ifa(net->ro._s_addr);
4313                                                 net->ro._s_addr = NULL;
4314                                         }
4315                                         net->src_addr_selected = 0;
4316                                 }
4317                         }
4318                         return (ret);
4319                 }
4320 #endif
4321 #ifdef INET6
4322         case AF_INET6:
4323                 {
4324                         uint32_t flowlabel, flowinfo;
4325                         struct ip6_hdr *ip6h;
4326                         struct route_in6 ip6route;
4327                         struct ifnet *ifp;
4328                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4329                         int prev_scope = 0;
4330                         struct sockaddr_in6 lsa6_storage;
4331                         int error;
4332                         u_short prev_port = 0;
4333                         int len;
4334
4335                         if (net) {
4336                                 flowlabel = net->flowlabel;
4337                         } else if (stcb) {
4338                                 flowlabel = stcb->asoc.default_flowlabel;
4339                         } else {
4340                                 flowlabel = inp->sctp_ep.default_flowlabel;
4341                         }
4342                         if (flowlabel == 0) {
4343                                 /*
4344                                  * This means especially, that it is not set
4345                                  * at the SCTP layer. So use the value from
4346                                  * the IP layer.
4347                                  */
4348                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4349                         }
4350                         flowlabel &= 0x000fffff;
4351                         len = SCTP_MIN_OVERHEAD;
4352                         if (port) {
4353                                 len += sizeof(struct udphdr);
4354                         }
4355                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4356                         if (newm == NULL) {
4357                                 sctp_m_freem(m);
4358                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4359                                 return (ENOMEM);
4360                         }
4361                         SCTP_ALIGN_TO_END(newm, len);
4362                         SCTP_BUF_LEN(newm) = len;
4363                         SCTP_BUF_NEXT(newm) = m;
4364                         m = newm;
4365                         if (net != NULL) {
4366                                 m->m_pkthdr.flowid = net->flowid;
4367                                 M_HASHTYPE_SET(m, net->flowtype);
4368                         } else {
4369                                 m->m_pkthdr.flowid = mflowid;
4370                                 M_HASHTYPE_SET(m, mflowtype);
4371                         }
4372                         packet_length = sctp_calculate_len(m);
4373
4374                         ip6h = mtod(m, struct ip6_hdr *);
4375                         /* protect *sin6 from overwrite */
4376                         sin6 = (struct sockaddr_in6 *)to;
4377                         tmp = *sin6;
4378                         sin6 = &tmp;
4379
4380                         /* KAME hack: embed scopeid */
4381                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4382                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4383                                 return (EINVAL);
4384                         }
4385                         if (net == NULL) {
4386                                 memset(&ip6route, 0, sizeof(ip6route));
4387                                 ro = (sctp_route_t *) & ip6route;
4388                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4389                         } else {
4390                                 ro = (sctp_route_t *) & net->ro;
4391                         }
4392                         /*
4393                          * We assume here that inp_flow is in host byte
4394                          * order within the TCB!
4395                          */
4396                         if (tos_value == 0) {
4397                                 /*
4398                                  * This means especially, that it is not set
4399                                  * at the SCTP layer. So use the value from
4400                                  * the IP layer.
4401                                  */
4402                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4403                         }
4404                         tos_value &= 0xfc;
4405                         if (ecn_ok) {
4406                                 tos_value |= sctp_get_ect(stcb);
4407                         }
4408                         flowinfo = 0x06;
4409                         flowinfo <<= 8;
4410                         flowinfo |= tos_value;
4411                         flowinfo <<= 20;
4412                         flowinfo |= flowlabel;
4413                         ip6h->ip6_flow = htonl(flowinfo);
4414                         if (port) {
4415                                 ip6h->ip6_nxt = IPPROTO_UDP;
4416                         } else {
4417                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4418                         }
4419                         ip6h->ip6_plen = (uint16_t) (packet_length - sizeof(struct ip6_hdr));
4420                         ip6h->ip6_dst = sin6->sin6_addr;
4421
4422                         /*
4423                          * Add SRC address selection here: we can only reuse
4424                          * to a limited degree the kame src-addr-sel, since
4425                          * we can try their selection but it may not be
4426                          * bound.
4427                          */
4428                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4429                         lsa6_tmp.sin6_family = AF_INET6;
4430                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4431                         lsa6 = &lsa6_tmp;
4432                         if (net && out_of_asoc_ok == 0) {
4433                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4434                                         sctp_free_ifa(net->ro._s_addr);
4435                                         net->ro._s_addr = NULL;
4436                                         net->src_addr_selected = 0;
4437                                         if (ro->ro_rt) {
4438                                                 RTFREE(ro->ro_rt);
4439                                                 ro->ro_rt = NULL;
4440                                         }
4441                                 }
4442                                 if (net->src_addr_selected == 0) {
4443                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4444                                         /* KAME hack: embed scopeid */
4445                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4446                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4447                                                 return (EINVAL);
4448                                         }
4449                                         /* Cache the source address */
4450                                         net->ro._s_addr = sctp_source_address_selection(inp,
4451                                             stcb,
4452                                             ro,
4453                                             net,
4454                                             0,
4455                                             vrf_id);
4456                                         (void)sa6_recoverscope(sin6);
4457                                         net->src_addr_selected = 1;
4458                                 }
4459                                 if (net->ro._s_addr == NULL) {
4460                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4461                                         net->src_addr_selected = 0;
4462                                         sctp_handle_no_route(stcb, net, so_locked);
4463                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464                                         sctp_m_freem(m);
4465                                         return (EHOSTUNREACH);
4466                                 }
4467                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4468                         } else {
4469                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4470                                 /* KAME hack: embed scopeid */
4471                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4472                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4473                                         return (EINVAL);
4474                                 }
4475                                 if (over_addr == NULL) {
4476                                         struct sctp_ifa *_lsrc;
4477
4478                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4479                                             net,
4480                                             out_of_asoc_ok,
4481                                             vrf_id);
4482                                         if (_lsrc == NULL) {
4483                                                 sctp_handle_no_route(stcb, net, so_locked);
4484                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485                                                 sctp_m_freem(m);
4486                                                 return (EHOSTUNREACH);
4487                                         }
4488                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4489                                         sctp_free_ifa(_lsrc);
4490                                 } else {
4491                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4492                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4493                                 }
4494                                 (void)sa6_recoverscope(sin6);
4495                         }
4496                         lsa6->sin6_port = inp->sctp_lport;
4497
4498                         if (ro->ro_rt == NULL) {
4499                                 /*
4500                                  * src addr selection failed to find a route
4501                                  * (or valid source addr), so we can't get
4502                                  * there from here!
4503                                  */
4504                                 sctp_handle_no_route(stcb, net, so_locked);
4505                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4506                                 sctp_m_freem(m);
4507                                 return (EHOSTUNREACH);
4508                         }
4509                         /*
4510                          * XXX: sa6 may not have a valid sin6_scope_id in
4511                          * the non-SCOPEDROUTING case.
4512                          */
4513                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4514                         lsa6_storage.sin6_family = AF_INET6;
4515                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4516                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4517                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4518                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4519                                 sctp_m_freem(m);
4520                                 return (error);
4521                         }
4522                         /* XXX */
4523                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4524                         lsa6_storage.sin6_port = inp->sctp_lport;
4525                         lsa6 = &lsa6_storage;
4526                         ip6h->ip6_src = lsa6->sin6_addr;
4527
4528                         if (port) {
4529                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4530                                         sctp_handle_no_route(stcb, net, so_locked);
4531                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4532                                         sctp_m_freem(m);
4533                                         return (EHOSTUNREACH);
4534                                 }
4535                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4536                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4537                                 udp->uh_dport = port;
4538                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip6_hdr)));
4539                                 udp->uh_sum = 0;
4540                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4541                         } else {
4542                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4543                         }
4544
4545                         sctphdr->src_port = src_port;
4546                         sctphdr->dest_port = dest_port;
4547                         sctphdr->v_tag = v_tag;
4548                         sctphdr->checksum = 0;
4549
4550                         /*
4551                          * We set the hop limit now since there is a good
4552                          * chance that our ro pointer is now filled
4553                          */
4554                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4555                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4556
4557 #ifdef SCTP_DEBUG
4558                         /* Copy to be sure something bad is not happening */
4559                         sin6->sin6_addr = ip6h->ip6_dst;
4560                         lsa6->sin6_addr = ip6h->ip6_src;
4561 #endif
4562
4563                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4564                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4565                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4566                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4567                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4568                         if (net) {
4569                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4570                                 /*
4571                                  * preserve the port and scope for link
4572                                  * local send
4573                                  */
4574                                 prev_scope = sin6->sin6_scope_id;
4575                                 prev_port = sin6->sin6_port;
4576                         }
4577                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4578                                 /* failed to prepend data, give up */
4579                                 sctp_m_freem(m);
4580                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4581                                 return (ENOMEM);
4582                         }
4583                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4584                         if (port) {
4585 #if defined(SCTP_WITH_NO_CSUM)
4586                                 SCTP_STAT_INCR(sctps_sendnocrc);
4587 #else
4588                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4589                                 SCTP_STAT_INCR(sctps_sendswcrc);
4590 #endif
4591                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4592                                         udp->uh_sum = 0xffff;
4593                                 }
4594                         } else {
4595 #if defined(SCTP_WITH_NO_CSUM)
4596                                 SCTP_STAT_INCR(sctps_sendnocrc);
4597 #else
4598                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4599                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4600                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4601 #endif
4602                         }
4603                         /* send it out. table id is taken from stcb */
4604 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4605                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4606                                 so = SCTP_INP_SO(inp);
4607                                 SCTP_SOCKET_UNLOCK(so, 0);
4608                         }
4609 #endif
4610 #ifdef SCTP_PACKET_LOGGING
4611                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4612                                 sctp_packet_log(o_pak);
4613 #endif
4614                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4615 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4616                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4617                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4618                                 SCTP_TCB_UNLOCK(stcb);
4619                                 SCTP_SOCKET_LOCK(so, 0);
4620                                 SCTP_TCB_LOCK(stcb);
4621                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4622                         }
4623 #endif
4624                         if (net) {
4625                                 /* for link local this must be done */
4626                                 sin6->sin6_scope_id = prev_scope;
4627                                 sin6->sin6_port = prev_port;
4628                         }
4629                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4630                         SCTP_STAT_INCR(sctps_sendpackets);
4631                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4632                         if (ret) {
4633                                 SCTP_STAT_INCR(sctps_senderrors);
4634                         }
4635                         if (net == NULL) {
4636                                 /* Now if we had a temp route free it */
4637                                 RO_RTFREE(ro);
4638                         } else {
4639                                 /*
4640                                  * PMTU check versus smallest asoc MTU goes
4641                                  * here
4642                                  */
4643                                 if (ro->ro_rt == NULL) {
4644                                         /* Route was freed */
4645                                         if (net->ro._s_addr &&
4646                                             net->src_addr_selected) {
4647                                                 sctp_free_ifa(net->ro._s_addr);
4648                                                 net->ro._s_addr = NULL;
4649                                         }
4650                                         net->src_addr_selected = 0;
4651                                 }
4652                                 if ((ro->ro_rt != NULL) &&
4653                                     (net->ro._s_addr)) {
4654                                         uint32_t mtu;
4655
4656                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4657                                         if (mtu &&
4658                                             (stcb->asoc.smallest_mtu > mtu)) {
4659                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4660                                                 net->mtu = mtu;
4661                                                 if (net->port) {
4662                                                         net->mtu -= sizeof(struct udphdr);
4663                                                 }
4664                                         }
4665                                 } else if (ifp) {
4666                                         if (ND_IFINFO(ifp)->linkmtu &&
4667                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4668                                                 sctp_mtu_size_reset(inp,
4669                                                     &stcb->asoc,
4670                                                     ND_IFINFO(ifp)->linkmtu);
4671                                         }
4672                                 }
4673                         }
4674                         return (ret);
4675                 }
4676 #endif
4677         default:
4678                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4679                     ((struct sockaddr *)to)->sa_family);
4680                 sctp_m_freem(m);
4681                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4682                 return (EFAULT);
4683         }
4684 }
4685
4686
4687 void
4688 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4689 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4690     SCTP_UNUSED
4691 #endif
4692 )
4693 {
4694         struct mbuf *m, *m_last;
4695         struct sctp_nets *net;
4696         struct sctp_init_chunk *init;
4697         struct sctp_supported_addr_param *sup_addr;
4698         struct sctp_adaptation_layer_indication *ali;
4699         struct sctp_supported_chunk_types_param *pr_supported;
4700         struct sctp_paramhdr *ph;
4701         int cnt_inits_to = 0;
4702         int ret;
4703         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4704
4705         /* INIT's always go to the primary (and usually ONLY address) */
4706         net = stcb->asoc.primary_destination;
4707         if (net == NULL) {
4708                 net = TAILQ_FIRST(&stcb->asoc.nets);
4709                 if (net == NULL) {
4710                         /* TSNH */
4711                         return;
4712                 }
4713                 /* we confirm any address we send an INIT to */
4714                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4715                 (void)sctp_set_primary_addr(stcb, NULL, net);
4716         } else {
4717                 /* we confirm any address we send an INIT to */
4718                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4719         }
4720         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4721 #ifdef INET6
4722         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4723                 /*
4724                  * special hook, if we are sending to link local it will not
4725                  * show up in our private address count.
4726                  */
4727                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4728                         cnt_inits_to = 1;
4729         }
4730 #endif
4731         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4732                 /* This case should not happen */
4733                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4734                 return;
4735         }
4736         /* start the INIT timer */
4737         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4738
4739         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4740         if (m == NULL) {
4741                 /* No memory, INIT timer will re-attempt. */
4742                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4743                 return;
4744         }
4745         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4746         padding_len = 0;
4747         /* Now lets put the chunk header in place */
4748         init = mtod(m, struct sctp_init_chunk *);
4749         /* now the chunk header */
4750         init->ch.chunk_type = SCTP_INITIATION;
4751         init->ch.chunk_flags = 0;
4752         /* fill in later from mbuf we build */
4753         init->ch.chunk_length = 0;
4754         /* place in my tag */
4755         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4756         /* set up some of the credits. */
4757         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4758             SCTP_MINIMAL_RWND));
4759         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4760         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4761         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4762
4763         /* Adaptation layer indication parameter */
4764         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4765                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4766                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4767                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4768                 ali->ph.param_length = htons(parameter_len);
4769                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4770                 chunk_len += parameter_len;
4771         }
4772         /* ECN parameter */
4773         if (stcb->asoc.ecn_supported == 1) {
4774                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4775                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4776                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4777                 ph->param_length = htons(parameter_len);
4778                 chunk_len += parameter_len;
4779         }
4780         /* PR-SCTP supported parameter */
4781         if (stcb->asoc.prsctp_supported == 1) {
4782                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4783                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4784                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4785                 ph->param_length = htons(parameter_len);
4786                 chunk_len += parameter_len;
4787         }
4788         /* Add NAT friendly parameter. */
4789         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4790                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4791                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4792                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4793                 ph->param_length = htons(parameter_len);
4794                 chunk_len += parameter_len;
4795         }
4796         /* And now tell the peer which extensions we support */
4797         num_ext = 0;
4798         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4799         if (stcb->asoc.prsctp_supported == 1) {
4800                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4801                 if (stcb->asoc.idata_supported) {
4802                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4803                 }
4804         }
4805         if (stcb->asoc.auth_supported == 1) {
4806                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4807         }
4808         if (stcb->asoc.asconf_supported == 1) {
4809                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4810                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4811         }
4812         if (stcb->asoc.reconfig_supported == 1) {
4813                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4814         }
4815         if (stcb->asoc.idata_supported) {
4816                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4817         }
4818         if (stcb->asoc.nrsack_supported == 1) {
4819                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4820         }
4821         if (stcb->asoc.pktdrop_supported == 1) {
4822                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4823         }
4824         if (num_ext > 0) {
4825                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4826                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4827                 pr_supported->ph.param_length = htons(parameter_len);
4828                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4829                 chunk_len += parameter_len;
4830         }
4831         /* add authentication parameters */
4832         if (stcb->asoc.auth_supported) {
4833                 /* attach RANDOM parameter, if available */
4834                 if (stcb->asoc.authinfo.random != NULL) {
4835                         struct sctp_auth_random *randp;
4836
4837                         if (padding_len > 0) {
4838                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4839                                 chunk_len += padding_len;
4840                                 padding_len = 0;
4841                         }
4842                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4843                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4844                         /* random key already contains the header */
4845                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4846                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4847                         chunk_len += parameter_len;
4848                 }
4849                 /* add HMAC_ALGO parameter */
4850                 if (stcb->asoc.local_hmacs != NULL) {
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 (stcb->asoc.local_auth_chunks != NULL) {
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 = SCTP_MIN_OVERHEAD;
5120 #else
5121                                         l_len = SCTP_MIN_V4_OVERHEAD;
5122 #endif
5123                                         l_len += sizeof(struct sctp_chunkhdr);
5124                                         l_len += plen;
5125                                         l_len += sizeof(struct sctp_paramhdr);
5126                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5127                                         if (op_err) {
5128                                                 SCTP_BUF_LEN(op_err) = 0;
5129                                                 /*
5130                                                  * pre-reserve space for ip
5131                                                  * and sctp header  and
5132                                                  * chunk hdr
5133                                                  */
5134 #ifdef INET6
5135                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5136 #else
5137                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5138 #endif
5139                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5140                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5141                                         }
5142                                 }
5143                                 if (op_err) {
5144                                         /* If we have space */
5145                                         struct sctp_paramhdr s;
5146
5147                                         if (err_at % 4) {
5148                                                 uint32_t cpthis = 0;
5149
5150                                                 pad_needed = 4 - (err_at % 4);
5151                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5152                                                 err_at += pad_needed;
5153                                         }
5154                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5155                                         s.param_length = htons(sizeof(s) + plen);
5156                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5157                                         err_at += sizeof(s);
5158                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5159                                         if (phdr == NULL) {
5160                                                 sctp_m_freem(op_err);
5161                                                 /*
5162                                                  * we are out of memory but
5163                                                  * we still need to have a
5164                                                  * look at what to do (the
5165                                                  * system is in trouble
5166                                                  * though).
5167                                                  */
5168                                                 return (NULL);
5169                                         }
5170                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5171                                 }
5172                                 return (op_err);
5173                                 break;
5174                         }
5175                 default:
5176                         /*
5177                          * we do not recognize the parameter figure out what
5178                          * we do.
5179                          */
5180                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5181                         if ((ptype & 0x4000) == 0x4000) {
5182                                 /* Report bit is set?? */
5183                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5184                                 if (op_err == NULL) {
5185                                         int l_len;
5186
5187                                         /* Ok need to try to get an mbuf */
5188 #ifdef INET6
5189                                         l_len = SCTP_MIN_OVERHEAD;
5190 #else
5191                                         l_len = SCTP_MIN_V4_OVERHEAD;
5192 #endif
5193                                         l_len += sizeof(struct sctp_chunkhdr);
5194                                         l_len += plen;
5195                                         l_len += sizeof(struct sctp_paramhdr);
5196                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5197                                         if (op_err) {
5198                                                 SCTP_BUF_LEN(op_err) = 0;
5199 #ifdef INET6
5200                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5201 #else
5202                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5203 #endif
5204                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5205                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5206                                         }
5207                                 }
5208                                 if (op_err) {
5209                                         /* If we have space */
5210                                         struct sctp_paramhdr s;
5211
5212                                         if (err_at % 4) {
5213                                                 uint32_t cpthis = 0;
5214
5215                                                 pad_needed = 4 - (err_at % 4);
5216                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5217                                                 err_at += pad_needed;
5218                                         }
5219                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5220                                         s.param_length = htons(sizeof(s) + plen);
5221                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5222                                         err_at += sizeof(s);
5223                                         if (plen > sizeof(tempbuf)) {
5224                                                 plen = sizeof(tempbuf);
5225                                         }
5226                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5227                                         if (phdr == NULL) {
5228                                                 sctp_m_freem(op_err);
5229                                                 /*
5230                                                  * we are out of memory but
5231                                                  * we still need to have a
5232                                                  * look at what to do (the
5233                                                  * system is in trouble
5234                                                  * though).
5235                                                  */
5236                                                 op_err = NULL;
5237                                                 goto more_processing;
5238                                         }
5239                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5240                                         err_at += plen;
5241                                 }
5242                         }
5243         more_processing:
5244                         if ((ptype & 0x8000) == 0x0000) {
5245                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5246                                 return (op_err);
5247                         } else {
5248                                 /* skip this chunk and continue processing */
5249                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5250                                 at += SCTP_SIZE32(plen);
5251                         }
5252                         break;
5253
5254                 }
5255                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5256         }
5257         return (op_err);
5258 invalid_size:
5259         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5260         *abort_processing = 1;
5261         if ((op_err == NULL) && phdr) {
5262                 int l_len;
5263
5264 #ifdef INET6
5265                 l_len = SCTP_MIN_OVERHEAD;
5266 #else
5267                 l_len = SCTP_MIN_V4_OVERHEAD;
5268 #endif
5269                 l_len += sizeof(struct sctp_chunkhdr);
5270                 l_len += (2 * sizeof(struct sctp_paramhdr));
5271                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5272                 if (op_err) {
5273                         SCTP_BUF_LEN(op_err) = 0;
5274 #ifdef INET6
5275                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5276 #else
5277                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5278 #endif
5279                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5280                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5281                 }
5282         }
5283         if ((op_err) && phdr) {
5284                 struct sctp_paramhdr s;
5285
5286                 if (err_at % 4) {
5287                         uint32_t cpthis = 0;
5288
5289                         pad_needed = 4 - (err_at % 4);
5290                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5291                         err_at += pad_needed;
5292                 }
5293                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5294                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5295                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5296                 err_at += sizeof(s);
5297                 /* Only copy back the p-hdr that caused the issue */
5298                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5299         }
5300         return (op_err);
5301 }
5302
5303 static int
5304 sctp_are_there_new_addresses(struct sctp_association *asoc,
5305     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5306 {
5307         /*
5308          * Given a INIT packet, look through the packet to verify that there
5309          * are NO new addresses. As we go through the parameters add reports
5310          * of any un-understood parameters that require an error.  Also we
5311          * must return (1) to drop the packet if we see a un-understood
5312          * parameter that tells us to drop the chunk.
5313          */
5314         struct sockaddr *sa_touse;
5315         struct sockaddr *sa;
5316         struct sctp_paramhdr *phdr, params;
5317         uint16_t ptype, plen;
5318         uint8_t fnd;
5319         struct sctp_nets *net;
5320         int check_src;
5321
5322 #ifdef INET
5323         struct sockaddr_in sin4, *sa4;
5324
5325 #endif
5326 #ifdef INET6
5327         struct sockaddr_in6 sin6, *sa6;
5328
5329 #endif
5330
5331 #ifdef INET
5332         memset(&sin4, 0, sizeof(sin4));
5333         sin4.sin_family = AF_INET;
5334         sin4.sin_len = sizeof(sin4);
5335 #endif
5336 #ifdef INET6
5337         memset(&sin6, 0, sizeof(sin6));
5338         sin6.sin6_family = AF_INET6;
5339         sin6.sin6_len = sizeof(sin6);
5340 #endif
5341         /* First what about the src address of the pkt ? */
5342         check_src = 0;
5343         switch (src->sa_family) {
5344 #ifdef INET
5345         case AF_INET:
5346                 if (asoc->scope.ipv4_addr_legal) {
5347                         check_src = 1;
5348                 }
5349                 break;
5350 #endif
5351 #ifdef INET6
5352         case AF_INET6:
5353                 if (asoc->scope.ipv6_addr_legal) {
5354                         check_src = 1;
5355                 }
5356                 break;
5357 #endif
5358         default:
5359                 /* TSNH */
5360                 break;
5361         }
5362         if (check_src) {
5363                 fnd = 0;
5364                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5365                         sa = (struct sockaddr *)&net->ro._l_addr;
5366                         if (sa->sa_family == src->sa_family) {
5367 #ifdef INET
5368                                 if (sa->sa_family == AF_INET) {
5369                                         struct sockaddr_in *src4;
5370
5371                                         sa4 = (struct sockaddr_in *)sa;
5372                                         src4 = (struct sockaddr_in *)src;
5373                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5374                                                 fnd = 1;
5375                                                 break;
5376                                         }
5377                                 }
5378 #endif
5379 #ifdef INET6
5380                                 if (sa->sa_family == AF_INET6) {
5381                                         struct sockaddr_in6 *src6;
5382
5383                                         sa6 = (struct sockaddr_in6 *)sa;
5384                                         src6 = (struct sockaddr_in6 *)src;
5385                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5386                                                 fnd = 1;
5387                                                 break;
5388                                         }
5389                                 }
5390 #endif
5391                         }
5392                 }
5393                 if (fnd == 0) {
5394                         /* New address added! no need to look further. */
5395                         return (1);
5396                 }
5397         }
5398         /* Ok so far lets munge through the rest of the packet */
5399         offset += sizeof(struct sctp_init_chunk);
5400         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5401         while (phdr) {
5402                 sa_touse = NULL;
5403                 ptype = ntohs(phdr->param_type);
5404                 plen = ntohs(phdr->param_length);
5405                 switch (ptype) {
5406 #ifdef INET
5407                 case SCTP_IPV4_ADDRESS:
5408                         {
5409                                 struct sctp_ipv4addr_param *p4, p4_buf;
5410
5411                                 phdr = sctp_get_next_param(in_initpkt, offset,
5412                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5413                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5414                                     phdr == NULL) {
5415                                         return (1);
5416                                 }
5417                                 if (asoc->scope.ipv4_addr_legal) {
5418                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5419                                         sin4.sin_addr.s_addr = p4->addr;
5420                                         sa_touse = (struct sockaddr *)&sin4;
5421                                 }
5422                                 break;
5423                         }
5424 #endif
5425 #ifdef INET6
5426                 case SCTP_IPV6_ADDRESS:
5427                         {
5428                                 struct sctp_ipv6addr_param *p6, p6_buf;
5429
5430                                 phdr = sctp_get_next_param(in_initpkt, offset,
5431                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5432                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5433                                     phdr == NULL) {
5434                                         return (1);
5435                                 }
5436                                 if (asoc->scope.ipv6_addr_legal) {
5437                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5438                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5439                                             sizeof(p6->addr));
5440                                         sa_touse = (struct sockaddr *)&sin6;
5441                                 }
5442                                 break;
5443                         }
5444 #endif
5445                 default:
5446                         sa_touse = NULL;
5447                         break;
5448                 }
5449                 if (sa_touse) {
5450                         /* ok, sa_touse points to one to check */
5451                         fnd = 0;
5452                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5453                                 sa = (struct sockaddr *)&net->ro._l_addr;
5454                                 if (sa->sa_family != sa_touse->sa_family) {
5455                                         continue;
5456                                 }
5457 #ifdef INET
5458                                 if (sa->sa_family == AF_INET) {
5459                                         sa4 = (struct sockaddr_in *)sa;
5460                                         if (sa4->sin_addr.s_addr ==
5461                                             sin4.sin_addr.s_addr) {
5462                                                 fnd = 1;
5463                                                 break;
5464                                         }
5465                                 }
5466 #endif
5467 #ifdef INET6
5468                                 if (sa->sa_family == AF_INET6) {
5469                                         sa6 = (struct sockaddr_in6 *)sa;
5470                                         if (SCTP6_ARE_ADDR_EQUAL(
5471                                             sa6, &sin6)) {
5472                                                 fnd = 1;
5473                                                 break;
5474                                         }
5475                                 }
5476 #endif
5477                         }
5478                         if (!fnd) {
5479                                 /* New addr added! no need to look further */
5480                                 return (1);
5481                         }
5482                 }
5483                 offset += SCTP_SIZE32(plen);
5484                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5485         }
5486         return (0);
5487 }
5488
5489 /*
5490  * Given a MBUF chain that was sent into us containing an INIT. Build a
5491  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5492  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5493  * message (i.e. the struct sctp_init_msg).
5494  */
5495 void
5496 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5497     struct sctp_nets *src_net, struct mbuf *init_pkt,
5498     int iphlen, int offset,
5499     struct sockaddr *src, struct sockaddr *dst,
5500     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5501     uint8_t mflowtype, uint32_t mflowid,
5502     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5503 {
5504         struct sctp_association *asoc;
5505         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5506         struct sctp_init_ack_chunk *initack;
5507         struct sctp_adaptation_layer_indication *ali;
5508         struct sctp_supported_chunk_types_param *pr_supported;
5509         struct sctp_paramhdr *ph;
5510         union sctp_sockstore *over_addr;
5511         struct sctp_scoping scp;
5512
5513 #ifdef INET
5514         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5515         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5516         struct sockaddr_in *sin;
5517
5518 #endif
5519 #ifdef INET6
5520         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5521         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5522         struct sockaddr_in6 *sin6;
5523
5524 #endif
5525         struct sockaddr *to;
5526         struct sctp_state_cookie stc;
5527         struct sctp_nets *net = NULL;
5528         uint8_t *signature = NULL;
5529         int cnt_inits_to = 0;
5530         uint16_t his_limit, i_want;
5531         int abort_flag;
5532         int nat_friendly = 0;
5533         struct socket *so;
5534         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5535
5536         if (stcb) {
5537                 asoc = &stcb->asoc;
5538         } else {
5539                 asoc = NULL;
5540         }
5541         if ((asoc != NULL) &&
5542             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5543                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5544                         /*
5545                          * new addresses, out of here in non-cookie-wait
5546                          * states
5547                          *
5548                          * Send an ABORT, without the new address error cause.
5549                          * This looks no different than if no listener was
5550                          * present.
5551                          */
5552                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5553                             "Address added");
5554                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5555                             mflowtype, mflowid, inp->fibnum,
5556                             vrf_id, port);
5557                         return;
5558                 }
5559                 if (src_net != NULL && (src_net->port != port)) {
5560                         /*
5561                          * change of remote encapsulation port, out of here
5562                          * in non-cookie-wait states
5563                          *
5564                          * Send an ABORT, without an specific error cause. This
5565                          * looks no different than if no listener was
5566                          * present.
5567                          */
5568                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5569                             "Remote encapsulation port changed");
5570                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5571                             mflowtype, mflowid, inp->fibnum,
5572                             vrf_id, port);
5573                         return;
5574                 }
5575         }
5576         abort_flag = 0;
5577         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5578             (offset + sizeof(struct sctp_init_chunk)),
5579             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5580         if (abort_flag) {
5581 do_a_abort:
5582                 if (op_err == NULL) {
5583                         char msg[SCTP_DIAG_INFO_LEN];
5584
5585                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5586                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5587                             msg);
5588                 }
5589                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5590                     init_chk->init.initiate_tag, op_err,
5591                     mflowtype, mflowid, inp->fibnum,
5592                     vrf_id, port);
5593                 return;
5594         }
5595         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5596         if (m == NULL) {
5597                 /* No memory, INIT timer will re-attempt. */
5598                 if (op_err)
5599                         sctp_m_freem(op_err);
5600                 return;
5601         }
5602         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5603         padding_len = 0;
5604
5605         /*
5606          * We might not overwrite the identification[] completely and on
5607          * some platforms time_entered will contain some padding. Therefore
5608          * zero out the cookie to avoid putting uninitialized memory on the
5609          * wire.
5610          */
5611         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5612
5613         /* the time I built cookie */
5614         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5615
5616         /* populate any tie tags */
5617         if (asoc != NULL) {
5618                 /* unlock before tag selections */
5619                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5620                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5621                 stc.cookie_life = asoc->cookie_life;
5622                 net = asoc->primary_destination;
5623         } else {
5624                 stc.tie_tag_my_vtag = 0;
5625                 stc.tie_tag_peer_vtag = 0;
5626                 /* life I will award this cookie */
5627                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5628         }
5629
5630         /* copy in the ports for later check */
5631         stc.myport = sh->dest_port;
5632         stc.peerport = sh->src_port;
5633
5634         /*
5635          * If we wanted to honor cookie life extensions, we would add to
5636          * stc.cookie_life. For now we should NOT honor any extension
5637          */
5638         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5639         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5640                 stc.ipv6_addr_legal = 1;
5641                 if (SCTP_IPV6_V6ONLY(inp)) {
5642                         stc.ipv4_addr_legal = 0;
5643                 } else {
5644                         stc.ipv4_addr_legal = 1;
5645                 }
5646         } else {
5647                 stc.ipv6_addr_legal = 0;
5648                 stc.ipv4_addr_legal = 1;
5649         }
5650         stc.ipv4_scope = 0;
5651         if (net == NULL) {
5652                 to = src;
5653                 switch (dst->sa_family) {
5654 #ifdef INET
5655                 case AF_INET:
5656                         {
5657                                 /* lookup address */
5658                                 stc.address[0] = src4->sin_addr.s_addr;
5659                                 stc.address[1] = 0;
5660                                 stc.address[2] = 0;
5661                                 stc.address[3] = 0;
5662                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5663                                 /* local from address */
5664                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5665                                 stc.laddress[1] = 0;
5666                                 stc.laddress[2] = 0;
5667                                 stc.laddress[3] = 0;
5668                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5669                                 /* scope_id is only for v6 */
5670                                 stc.scope_id = 0;
5671                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5672                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5673                                         stc.ipv4_scope = 1;
5674                                 }
5675                                 /* Must use the address in this case */
5676                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5677                                         stc.loopback_scope = 1;
5678                                         stc.ipv4_scope = 1;
5679                                         stc.site_scope = 1;
5680                                         stc.local_scope = 0;
5681                                 }
5682                                 break;
5683                         }
5684 #endif
5685 #ifdef INET6
5686                 case AF_INET6:
5687                         {
5688                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5689                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5690                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5691                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5692                                         stc.loopback_scope = 1;
5693                                         stc.local_scope = 0;
5694                                         stc.site_scope = 1;
5695                                         stc.ipv4_scope = 1;
5696                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5697                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5698                                         /*
5699                                          * If the new destination or source
5700                                          * is a LINK_LOCAL we must have
5701                                          * common both site and local scope.
5702                                          * Don't set local scope though
5703                                          * since we must depend on the
5704                                          * source to be added implicitly. We
5705                                          * cannot assure just because we
5706                                          * share one link that all links are
5707                                          * common.
5708                                          */
5709                                         stc.local_scope = 0;
5710                                         stc.site_scope = 1;
5711                                         stc.ipv4_scope = 1;
5712                                         /*
5713                                          * we start counting for the private
5714                                          * address stuff at 1. since the
5715                                          * link local we source from won't
5716                                          * show up in our scoped count.
5717                                          */
5718                                         cnt_inits_to = 1;
5719                                         /*
5720                                          * pull out the scope_id from
5721                                          * incoming pkt
5722                                          */
5723                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5724                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5725                                         /*
5726                                          * If the new destination or source
5727                                          * is SITE_LOCAL then we must have
5728                                          * site scope in common.
5729                                          */
5730                                         stc.site_scope = 1;
5731                                 }
5732                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5733                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5734                                 break;
5735                         }
5736 #endif
5737                 default:
5738                         /* TSNH */
5739                         goto do_a_abort;
5740                         break;
5741                 }
5742         } else {
5743                 /* set the scope per the existing tcb */
5744
5745 #ifdef INET6
5746                 struct sctp_nets *lnet;
5747
5748 #endif
5749
5750                 stc.loopback_scope = asoc->scope.loopback_scope;
5751                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5752                 stc.site_scope = asoc->scope.site_scope;
5753                 stc.local_scope = asoc->scope.local_scope;
5754 #ifdef INET6
5755                 /* Why do we not consider IPv4 LL addresses? */
5756                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5757                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5758                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5759                                         /*
5760                                          * if we have a LL address, start
5761                                          * counting at 1.
5762                                          */
5763                                         cnt_inits_to = 1;
5764                                 }
5765                         }
5766                 }
5767 #endif
5768                 /* use the net pointer */
5769                 to = (struct sockaddr *)&net->ro._l_addr;
5770                 switch (to->sa_family) {
5771 #ifdef INET
5772                 case AF_INET:
5773                         sin = (struct sockaddr_in *)to;
5774                         stc.address[0] = sin->sin_addr.s_addr;
5775                         stc.address[1] = 0;
5776                         stc.address[2] = 0;
5777                         stc.address[3] = 0;
5778                         stc.addr_type = SCTP_IPV4_ADDRESS;
5779                         if (net->src_addr_selected == 0) {
5780                                 /*
5781                                  * strange case here, the INIT should have
5782                                  * did the selection.
5783                                  */
5784                                 net->ro._s_addr = sctp_source_address_selection(inp,
5785                                     stcb, (sctp_route_t *) & net->ro,
5786                                     net, 0, vrf_id);
5787                                 if (net->ro._s_addr == NULL)
5788                                         return;
5789
5790                                 net->src_addr_selected = 1;
5791
5792                         }
5793                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5794                         stc.laddress[1] = 0;
5795                         stc.laddress[2] = 0;
5796                         stc.laddress[3] = 0;
5797                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5798                         /* scope_id is only for v6 */
5799                         stc.scope_id = 0;
5800                         break;
5801 #endif
5802 #ifdef INET6
5803                 case AF_INET6:
5804                         sin6 = (struct sockaddr_in6 *)to;
5805                         memcpy(&stc.address, &sin6->sin6_addr,
5806                             sizeof(struct in6_addr));
5807                         stc.addr_type = SCTP_IPV6_ADDRESS;
5808                         stc.scope_id = sin6->sin6_scope_id;
5809                         if (net->src_addr_selected == 0) {
5810                                 /*
5811                                  * strange case here, the INIT should have
5812                                  * done the selection.
5813                                  */
5814                                 net->ro._s_addr = sctp_source_address_selection(inp,
5815                                     stcb, (sctp_route_t *) & net->ro,
5816                                     net, 0, vrf_id);
5817                                 if (net->ro._s_addr == NULL)
5818                                         return;
5819
5820                                 net->src_addr_selected = 1;
5821                         }
5822                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5823                             sizeof(struct in6_addr));
5824                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5825                         break;
5826 #endif
5827                 }
5828         }
5829         /* Now lets put the SCTP header in place */
5830         initack = mtod(m, struct sctp_init_ack_chunk *);
5831         /* Save it off for quick ref */
5832         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5833         /* who are we */
5834         memcpy(stc.identification, SCTP_VERSION_STRING,
5835             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5836         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5837         /* now the chunk header */
5838         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5839         initack->ch.chunk_flags = 0;
5840         /* fill in later from mbuf we build */
5841         initack->ch.chunk_length = 0;
5842         /* place in my tag */
5843         if ((asoc != NULL) &&
5844             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5845             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5846             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5847                 /* re-use the v-tags and init-seq here */
5848                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5849                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5850         } else {
5851                 uint32_t vtag, itsn;
5852
5853                 if (hold_inp_lock) {
5854                         SCTP_INP_INCR_REF(inp);
5855                         SCTP_INP_RUNLOCK(inp);
5856                 }
5857                 if (asoc) {
5858                         atomic_add_int(&asoc->refcnt, 1);
5859                         SCTP_TCB_UNLOCK(stcb);
5860         new_tag:
5861                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5862                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5863                                 /*
5864                                  * Got a duplicate vtag on some guy behind a
5865                                  * nat make sure we don't use it.
5866                                  */
5867                                 goto new_tag;
5868                         }
5869                         initack->init.initiate_tag = htonl(vtag);
5870                         /* get a TSN to use too */
5871                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5872                         initack->init.initial_tsn = htonl(itsn);
5873                         SCTP_TCB_LOCK(stcb);
5874                         atomic_add_int(&asoc->refcnt, -1);
5875                 } else {
5876                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5877                         initack->init.initiate_tag = htonl(vtag);
5878                         /* get a TSN to use too */
5879                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5880                 }
5881                 if (hold_inp_lock) {
5882                         SCTP_INP_RLOCK(inp);
5883                         SCTP_INP_DECR_REF(inp);
5884                 }
5885         }
5886         /* save away my tag to */
5887         stc.my_vtag = initack->init.initiate_tag;
5888
5889         /* set up some of the credits. */
5890         so = inp->sctp_socket;
5891         if (so == NULL) {
5892                 /* memory problem */
5893                 sctp_m_freem(m);
5894                 return;
5895         } else {
5896                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5897         }
5898         /* set what I want */
5899         his_limit = ntohs(init_chk->init.num_inbound_streams);
5900         /* choose what I want */
5901         if (asoc != NULL) {
5902                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5903                         i_want = asoc->streamoutcnt;
5904                 } else {
5905                         i_want = asoc->pre_open_streams;
5906                 }
5907         } else {
5908                 i_want = inp->sctp_ep.pre_open_stream_count;
5909         }
5910         if (his_limit < i_want) {
5911                 /* I Want more :< */
5912                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5913         } else {
5914                 /* I can have what I want :> */
5915                 initack->init.num_outbound_streams = htons(i_want);
5916         }
5917         /* tell him his limit. */
5918         initack->init.num_inbound_streams =
5919             htons(inp->sctp_ep.max_open_streams_intome);
5920
5921         /* adaptation layer indication parameter */
5922         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5923                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5924                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5925                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5926                 ali->ph.param_length = htons(parameter_len);
5927                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5928                 chunk_len += parameter_len;
5929         }
5930         /* ECN parameter */
5931         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5932             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5933                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5934                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5935                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5936                 ph->param_length = htons(parameter_len);
5937                 chunk_len += parameter_len;
5938         }
5939         /* PR-SCTP supported parameter */
5940         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5941             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5942                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5943                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5944                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5945                 ph->param_length = htons(parameter_len);
5946                 chunk_len += parameter_len;
5947         }
5948         /* Add NAT friendly parameter */
5949         if (nat_friendly) {
5950                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5951                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5952                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5953                 ph->param_length = htons(parameter_len);
5954                 chunk_len += parameter_len;
5955         }
5956         /* And now tell the peer which extensions we support */
5957         num_ext = 0;
5958         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5959         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5960             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5962                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5963                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5964                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5965                 }
5966         }
5967         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5968             ((asoc == NULL) && (inp->auth_supported == 1))) {
5969                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5970         }
5971         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5972             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5973                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5974                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5975         }
5976         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5977             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5978                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5979         }
5980         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5981             ((asoc == NULL) && (inp->idata_supported == 1))) {
5982                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5983         }
5984         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5985             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5986                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5987         }
5988         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5989             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5990                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5991         }
5992         if (num_ext > 0) {
5993                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5994                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5995                 pr_supported->ph.param_length = htons(parameter_len);
5996                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5997                 chunk_len += parameter_len;
5998         }
5999         /* add authentication parameters */
6000         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6001             ((asoc == NULL) && (inp->auth_supported == 1))) {
6002                 struct sctp_auth_random *randp;
6003                 struct sctp_auth_hmac_algo *hmacs;
6004                 struct sctp_auth_chunk_list *chunks;
6005
6006                 if (padding_len > 0) {
6007                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6008                         chunk_len += padding_len;
6009                         padding_len = 0;
6010                 }
6011                 /* generate and add RANDOM parameter */
6012                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6013                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
6014                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6015                 randp->ph.param_type = htons(SCTP_RANDOM);
6016                 randp->ph.param_length = htons(parameter_len);
6017                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6018                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6019                 chunk_len += parameter_len;
6020
6021                 if (padding_len > 0) {
6022                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6023                         chunk_len += padding_len;
6024                         padding_len = 0;
6025                 }
6026                 /* add HMAC_ALGO parameter */
6027                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6028                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
6029                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6030                     (uint8_t *) hmacs->hmac_ids);
6031                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6032                 hmacs->ph.param_length = htons(parameter_len);
6033                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6034                 chunk_len += parameter_len;
6035
6036                 if (padding_len > 0) {
6037                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6038                         chunk_len += padding_len;
6039                         padding_len = 0;
6040                 }
6041                 /* add CHUNKS parameter */
6042                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6043                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6044                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6045                     chunks->chunk_types);
6046                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6047                 chunks->ph.param_length = htons(parameter_len);
6048                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6049                 chunk_len += parameter_len;
6050         }
6051         SCTP_BUF_LEN(m) = chunk_len;
6052         m_last = m;
6053         /* now the addresses */
6054         /*
6055          * To optimize this we could put the scoping stuff into a structure
6056          * and remove the individual uint8's from the stc structure. Then we
6057          * could just sifa in the address within the stc.. but for now this
6058          * is a quick hack to get the address stuff teased apart.
6059          */
6060         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6061         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6062         scp.loopback_scope = stc.loopback_scope;
6063         scp.ipv4_local_scope = stc.ipv4_scope;
6064         scp.local_scope = stc.local_scope;
6065         scp.site_scope = stc.site_scope;
6066         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6067             cnt_inits_to,
6068             &padding_len, &chunk_len);
6069         /* padding_len can only be positive, if no addresses have been added */
6070         if (padding_len > 0) {
6071                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6072                 chunk_len += padding_len;
6073                 SCTP_BUF_LEN(m) += padding_len;
6074                 padding_len = 0;
6075         }
6076         /* tack on the operational error if present */
6077         if (op_err) {
6078                 parameter_len = 0;
6079                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6080                         parameter_len += SCTP_BUF_LEN(m_tmp);
6081                 }
6082                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6083                 SCTP_BUF_NEXT(m_last) = op_err;
6084                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6085                         m_last = SCTP_BUF_NEXT(m_last);
6086                 }
6087                 chunk_len += parameter_len;
6088         }
6089         if (padding_len > 0) {
6090                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6091                 if (m_last == NULL) {
6092                         /* Houston we have a problem, no space */
6093                         sctp_m_freem(m);
6094                         return;
6095                 }
6096                 chunk_len += padding_len;
6097                 padding_len = 0;
6098         }
6099         /* Now we must build a cookie */
6100         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6101         if (m_cookie == NULL) {
6102                 /* memory problem */
6103                 sctp_m_freem(m);
6104                 return;
6105         }
6106         /* Now append the cookie to the end and update the space/size */
6107         SCTP_BUF_NEXT(m_last) = m_cookie;
6108         parameter_len = 0;
6109         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6110                 parameter_len += SCTP_BUF_LEN(m_tmp);
6111                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6112                         m_last = m_tmp;
6113                 }
6114         }
6115         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6116         chunk_len += parameter_len;
6117
6118         /*
6119          * Place in the size, but we don't include the last pad (if any) in
6120          * the INIT-ACK.
6121          */
6122         initack->ch.chunk_length = htons(chunk_len);
6123
6124         /*
6125          * Time to sign the cookie, we don't sign over the cookie signature
6126          * though thus we set trailer.
6127          */
6128         (void)sctp_hmac_m(SCTP_HMAC,
6129             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6130             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6131             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6132         /*
6133          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6134          * here since the timer will drive a retranmission.
6135          */
6136         if (padding_len > 0) {
6137                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6138                         sctp_m_freem(m);
6139                         return;
6140                 }
6141         }
6142         if (stc.loopback_scope) {
6143                 over_addr = (union sctp_sockstore *)dst;
6144         } else {
6145                 over_addr = NULL;
6146         }
6147
6148         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6149             0, 0,
6150             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6151             port, over_addr,
6152             mflowtype, mflowid,
6153             SCTP_SO_NOT_LOCKED);
6154         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6155 }
6156
6157
6158 static void
6159 sctp_prune_prsctp(struct sctp_tcb *stcb,
6160     struct sctp_association *asoc,
6161     struct sctp_sndrcvinfo *srcv,
6162     int dataout)
6163 {
6164         int freed_spc = 0;
6165         struct sctp_tmit_chunk *chk, *nchk;
6166
6167         SCTP_TCB_LOCK_ASSERT(stcb);
6168         if ((asoc->prsctp_supported) &&
6169             (asoc->sent_queue_cnt_removeable > 0)) {
6170                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6171                         /*
6172                          * Look for chunks marked with the PR_SCTP flag AND
6173                          * the buffer space flag. If the one being sent is
6174                          * equal or greater priority then purge the old one
6175                          * and free some space.
6176                          */
6177                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6178                                 /*
6179                                  * This one is PR-SCTP AND buffer space
6180                                  * limited type
6181                                  */
6182                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6183                                         /*
6184                                          * Lower numbers equates to higher
6185                                          * priority so if the one we are
6186                                          * looking at has a larger or equal
6187                                          * priority we want to drop the data
6188                                          * and NOT retransmit it.
6189                                          */
6190                                         if (chk->data) {
6191                                                 /*
6192                                                  * We release the book_size
6193                                                  * if the mbuf is here
6194                                                  */
6195                                                 int ret_spc;
6196                                                 uint8_t sent;
6197
6198                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6199                                                         sent = 1;
6200                                                 else
6201                                                         sent = 0;
6202                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6203                                                     sent,
6204                                                     SCTP_SO_LOCKED);
6205                                                 freed_spc += ret_spc;
6206                                                 if (freed_spc >= dataout) {
6207                                                         return;
6208                                                 }
6209                                         }       /* if chunk was present */
6210                                 }       /* if of sufficient priority */
6211                         }       /* if chunk has enabled */
6212                 }               /* tailqforeach */
6213
6214                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6215                         /* Here we must move to the sent queue and mark */
6216                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6217                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6218                                         if (chk->data) {
6219                                                 /*
6220                                                  * We release the book_size
6221                                                  * if the mbuf is here
6222                                                  */
6223                                                 int ret_spc;
6224
6225                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6226                                                     0, SCTP_SO_LOCKED);
6227
6228                                                 freed_spc += ret_spc;
6229                                                 if (freed_spc >= dataout) {
6230                                                         return;
6231                                                 }
6232                                         }       /* end if chk->data */
6233                                 }       /* end if right class */
6234                         }       /* end if chk pr-sctp */
6235                 }               /* tailqforeachsafe (chk) */
6236         }                       /* if enabled in asoc */
6237 }
6238
6239 int
6240 sctp_get_frag_point(struct sctp_tcb *stcb,
6241     struct sctp_association *asoc)
6242 {
6243         int siz, ovh;
6244
6245         /*
6246          * For endpoints that have both v6 and v4 addresses we must reserve
6247          * room for the ipv6 header, for those that are only dealing with V4
6248          * we use a larger frag point.
6249          */
6250         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6251                 ovh = SCTP_MIN_OVERHEAD;
6252         } else {
6253                 ovh = SCTP_MIN_V4_OVERHEAD;
6254         }
6255         if (stcb->asoc.idata_supported) {
6256                 ovh += sizeof(struct sctp_idata_chunk);
6257         } else {
6258                 ovh += sizeof(struct sctp_data_chunk);
6259         }
6260         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6261                 siz = asoc->smallest_mtu - ovh;
6262         else
6263                 siz = (stcb->asoc.sctp_frag_point - ovh);
6264         /*
6265          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6266          */
6267         /* A data chunk MUST fit in a cluster */
6268         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6269         /* } */
6270
6271         /* adjust for an AUTH chunk if DATA requires auth */
6272         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6273                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6274
6275         if (siz % 4) {
6276                 /* make it an even word boundary please */
6277                 siz -= (siz % 4);
6278         }
6279         return (siz);
6280 }
6281
6282 static void
6283 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6284 {
6285         /*
6286          * We assume that the user wants PR_SCTP_TTL if the user provides a
6287          * positive lifetime but does not specify any PR_SCTP policy.
6288          */
6289         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6290                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6291         } else if (sp->timetolive > 0) {
6292                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6293                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6294         } else {
6295                 return;
6296         }
6297         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6298         case CHUNK_FLAGS_PR_SCTP_BUF:
6299                 /*
6300                  * Time to live is a priority stored in tv_sec when doing
6301                  * the buffer drop thing.
6302                  */
6303                 sp->ts.tv_sec = sp->timetolive;
6304                 sp->ts.tv_usec = 0;
6305                 break;
6306         case CHUNK_FLAGS_PR_SCTP_TTL:
6307                 {
6308                         struct timeval tv;
6309
6310                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6311                         tv.tv_sec = sp->timetolive / 1000;
6312                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6313                         /*
6314                          * TODO sctp_constants.h needs alternative time
6315                          * macros when _KERNEL is undefined.
6316                          */
6317                         timevaladd(&sp->ts, &tv);
6318                 }
6319                 break;
6320         case CHUNK_FLAGS_PR_SCTP_RTX:
6321                 /*
6322                  * Time to live is a the number or retransmissions stored in
6323                  * tv_sec.
6324                  */
6325                 sp->ts.tv_sec = sp->timetolive;
6326                 sp->ts.tv_usec = 0;
6327                 break;
6328         default:
6329                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6330                     "Unknown PR_SCTP policy %u.\n",
6331                     PR_SCTP_POLICY(sp->sinfo_flags));
6332                 break;
6333         }
6334 }
6335
6336 static int
6337 sctp_msg_append(struct sctp_tcb *stcb,
6338     struct sctp_nets *net,
6339     struct mbuf *m,
6340     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6341 {
6342         int error = 0;
6343         struct mbuf *at;
6344         struct sctp_stream_queue_pending *sp = NULL;
6345         struct sctp_stream_out *strm;
6346
6347         /*
6348          * Given an mbuf chain, put it into the association send queue and
6349          * place it on the wheel
6350          */
6351         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6352                 /* Invalid stream number */
6353                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6354                 error = EINVAL;
6355                 goto out_now;
6356         }
6357         if ((stcb->asoc.stream_locked) &&
6358             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6359                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6360                 error = EINVAL;
6361                 goto out_now;
6362         }
6363         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6364         /* Now can we send this? */
6365         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6366             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6367             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6368             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6369                 /* got data while shutting down */
6370                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6371                 error = ECONNRESET;
6372                 goto out_now;
6373         }
6374         sctp_alloc_a_strmoq(stcb, sp);
6375         if (sp == NULL) {
6376                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6377                 error = ENOMEM;
6378                 goto out_now;
6379         }
6380         sp->sinfo_flags = srcv->sinfo_flags;
6381         sp->timetolive = srcv->sinfo_timetolive;
6382         sp->ppid = srcv->sinfo_ppid;
6383         sp->context = srcv->sinfo_context;
6384         sp->fsn = 0;
6385         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6386                 sp->net = net;
6387                 atomic_add_int(&sp->net->ref_count, 1);
6388         } else {
6389                 sp->net = NULL;
6390         }
6391         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6392         sp->stream = srcv->sinfo_stream;
6393         sp->msg_is_complete = 1;
6394         sp->sender_all_done = 1;
6395         sp->some_taken = 0;
6396         sp->data = m;
6397         sp->tail_mbuf = NULL;
6398         sctp_set_prsctp_policy(sp);
6399         /*
6400          * We could in theory (for sendall) sifa the length in, but we would
6401          * still have to hunt through the chain since we need to setup the
6402          * tail_mbuf
6403          */
6404         sp->length = 0;
6405         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6406                 if (SCTP_BUF_NEXT(at) == NULL)
6407                         sp->tail_mbuf = at;
6408                 sp->length += SCTP_BUF_LEN(at);
6409         }
6410         if (srcv->sinfo_keynumber_valid) {
6411                 sp->auth_keyid = srcv->sinfo_keynumber;
6412         } else {
6413                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6414         }
6415         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6416                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6417                 sp->holds_key_ref = 1;
6418         }
6419         if (hold_stcb_lock == 0) {
6420                 SCTP_TCB_SEND_LOCK(stcb);
6421         }
6422         sctp_snd_sb_alloc(stcb, sp->length);
6423         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6424         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6425         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6426         m = NULL;
6427         if (hold_stcb_lock == 0) {
6428                 SCTP_TCB_SEND_UNLOCK(stcb);
6429         }
6430 out_now:
6431         if (m) {
6432                 sctp_m_freem(m);
6433         }
6434         return (error);
6435 }
6436
6437
6438 static struct mbuf *
6439 sctp_copy_mbufchain(struct mbuf *clonechain,
6440     struct mbuf *outchain,
6441     struct mbuf **endofchain,
6442     int can_take_mbuf,
6443     int sizeofcpy,
6444     uint8_t copy_by_ref)
6445 {
6446         struct mbuf *m;
6447         struct mbuf *appendchain;
6448         caddr_t cp;
6449         int len;
6450
6451         if (endofchain == NULL) {
6452                 /* error */
6453 error_out:
6454                 if (outchain)
6455                         sctp_m_freem(outchain);
6456                 return (NULL);
6457         }
6458         if (can_take_mbuf) {
6459                 appendchain = clonechain;
6460         } else {
6461                 if (!copy_by_ref &&
6462                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6463                     ) {
6464                         /* Its not in a cluster */
6465                         if (*endofchain == NULL) {
6466                                 /* lets get a mbuf cluster */
6467                                 if (outchain == NULL) {
6468                                         /* This is the general case */
6469                         new_mbuf:
6470                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6471                                         if (outchain == NULL) {
6472                                                 goto error_out;
6473                                         }
6474                                         SCTP_BUF_LEN(outchain) = 0;
6475                                         *endofchain = outchain;
6476                                         /* get the prepend space */
6477                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6478                                 } else {
6479                                         /*
6480                                          * We really should not get a NULL
6481                                          * in endofchain
6482                                          */
6483                                         /* find end */
6484                                         m = outchain;
6485                                         while (m) {
6486                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6487                                                         *endofchain = m;
6488                                                         break;
6489                                                 }
6490                                                 m = SCTP_BUF_NEXT(m);
6491                                         }
6492                                         /* sanity */
6493                                         if (*endofchain == NULL) {
6494                                                 /*
6495                                                  * huh, TSNH XXX maybe we
6496                                                  * should panic
6497                                                  */
6498                                                 sctp_m_freem(outchain);
6499                                                 goto new_mbuf;
6500                                         }
6501                                 }
6502                                 /* get the new end of length */
6503                                 len = (int)M_TRAILINGSPACE(*endofchain);
6504                         } else {
6505                                 /* how much is left at the end? */
6506                                 len = (int)M_TRAILINGSPACE(*endofchain);
6507                         }
6508                         /* Find the end of the data, for appending */
6509                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6510
6511                         /* Now lets copy it out */
6512                         if (len >= sizeofcpy) {
6513                                 /* It all fits, copy it in */
6514                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6515                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6516                         } else {
6517                                 /* fill up the end of the chain */
6518                                 if (len > 0) {
6519                                         m_copydata(clonechain, 0, len, cp);
6520                                         SCTP_BUF_LEN((*endofchain)) += len;
6521                                         /* now we need another one */
6522                                         sizeofcpy -= len;
6523                                 }
6524                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6525                                 if (m == NULL) {
6526                                         /* We failed */
6527                                         goto error_out;
6528                                 }
6529                                 SCTP_BUF_NEXT((*endofchain)) = m;
6530                                 *endofchain = m;
6531                                 cp = mtod((*endofchain), caddr_t);
6532                                 m_copydata(clonechain, len, sizeofcpy, cp);
6533                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6534                         }
6535                         return (outchain);
6536                 } else {
6537                         /* copy the old fashion way */
6538                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6539 #ifdef SCTP_MBUF_LOGGING
6540                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6541                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6542                         }
6543 #endif
6544                 }
6545         }
6546         if (appendchain == NULL) {
6547                 /* error */
6548                 if (outchain)
6549                         sctp_m_freem(outchain);
6550                 return (NULL);
6551         }
6552         if (outchain) {
6553                 /* tack on to the end */
6554                 if (*endofchain != NULL) {
6555                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6556                 } else {
6557                         m = outchain;
6558                         while (m) {
6559                                 if (SCTP_BUF_NEXT(m) == NULL) {
6560                                         SCTP_BUF_NEXT(m) = appendchain;
6561                                         break;
6562                                 }
6563                                 m = SCTP_BUF_NEXT(m);
6564                         }
6565                 }
6566                 /*
6567                  * save off the end and update the end-chain position
6568                  */
6569                 m = appendchain;
6570                 while (m) {
6571                         if (SCTP_BUF_NEXT(m) == NULL) {
6572                                 *endofchain = m;
6573                                 break;
6574                         }
6575                         m = SCTP_BUF_NEXT(m);
6576                 }
6577                 return (outchain);
6578         } else {
6579                 /* save off the end and update the end-chain position */
6580                 m = appendchain;
6581                 while (m) {
6582                         if (SCTP_BUF_NEXT(m) == NULL) {
6583                                 *endofchain = m;
6584                                 break;
6585                         }
6586                         m = SCTP_BUF_NEXT(m);
6587                 }
6588                 return (appendchain);
6589         }
6590 }
6591
6592 static int
6593 sctp_med_chunk_output(struct sctp_inpcb *inp,
6594     struct sctp_tcb *stcb,
6595     struct sctp_association *asoc,
6596     int *num_out,
6597     int *reason_code,
6598     int control_only, int from_where,
6599     struct timeval *now, int *now_filled, int frag_point, int so_locked
6600 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6601     SCTP_UNUSED
6602 #endif
6603 );
6604
6605 static void
6606 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6607     uint32_t val SCTP_UNUSED)
6608 {
6609         struct sctp_copy_all *ca;
6610         struct mbuf *m;
6611         int ret = 0;
6612         int added_control = 0;
6613         int un_sent, do_chunk_output = 1;
6614         struct sctp_association *asoc;
6615         struct sctp_nets *net;
6616
6617         ca = (struct sctp_copy_all *)ptr;
6618         if (ca->m == NULL) {
6619                 return;
6620         }
6621         if (ca->inp != inp) {
6622                 /* TSNH */
6623                 return;
6624         }
6625         if (ca->sndlen > 0) {
6626                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6627                 if (m == NULL) {
6628                         /* can't copy so we are done */
6629                         ca->cnt_failed++;
6630                         return;
6631                 }
6632 #ifdef SCTP_MBUF_LOGGING
6633                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6634                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6635                 }
6636 #endif
6637         } else {
6638                 m = NULL;
6639         }
6640         SCTP_TCB_LOCK_ASSERT(stcb);
6641         if (stcb->asoc.alternate) {
6642                 net = stcb->asoc.alternate;
6643         } else {
6644                 net = stcb->asoc.primary_destination;
6645         }
6646         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6647                 /* Abort this assoc with m as the user defined reason */
6648                 if (m != NULL) {
6649                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6650                 } else {
6651                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6652                             0, M_NOWAIT, 1, MT_DATA);
6653                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6654                 }
6655                 if (m != NULL) {
6656                         struct sctp_paramhdr *ph;
6657
6658                         ph = mtod(m, struct sctp_paramhdr *);
6659                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6660                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + ca->sndlen));
6661                 }
6662                 /*
6663                  * We add one here to keep the assoc from dis-appearing on
6664                  * us.
6665                  */
6666                 atomic_add_int(&stcb->asoc.refcnt, 1);
6667                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6668                 /*
6669                  * sctp_abort_an_association calls sctp_free_asoc() free
6670                  * association will NOT free it since we incremented the
6671                  * refcnt .. we do this to prevent it being freed and things
6672                  * getting tricky since we could end up (from free_asoc)
6673                  * calling inpcb_free which would get a recursive lock call
6674                  * to the iterator lock.. But as a consequence of that the
6675                  * stcb will return to us un-locked.. since free_asoc
6676                  * returns with either no TCB or the TCB unlocked, we must
6677                  * relock.. to unlock in the iterator timer :-0
6678                  */
6679                 SCTP_TCB_LOCK(stcb);
6680                 atomic_add_int(&stcb->asoc.refcnt, -1);
6681                 goto no_chunk_output;
6682         } else {
6683                 if (m) {
6684                         ret = sctp_msg_append(stcb, net, m,
6685                             &ca->sndrcv, 1);
6686                 }
6687                 asoc = &stcb->asoc;
6688                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6689                         /* shutdown this assoc */
6690                         int cnt;
6691
6692                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6693
6694                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6695                             TAILQ_EMPTY(&asoc->sent_queue) &&
6696                             (cnt == 0)) {
6697                                 if (asoc->locked_on_sending) {
6698                                         goto abort_anyway;
6699                                 }
6700                                 /*
6701                                  * there is nothing queued to send, so I'm
6702                                  * done...
6703                                  */
6704                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6705                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6706                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6707                                         /*
6708                                          * only send SHUTDOWN the first time
6709                                          * through
6710                                          */
6711                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6712                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6713                                         }
6714                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6715                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6716                                         sctp_stop_timers_for_shutdown(stcb);
6717                                         sctp_send_shutdown(stcb, net);
6718                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6719                                             net);
6720                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6721                                             asoc->primary_destination);
6722                                         added_control = 1;
6723                                         do_chunk_output = 0;
6724                                 }
6725                         } else {
6726                                 /*
6727                                  * we still got (or just got) data to send,
6728                                  * so set SHUTDOWN_PENDING
6729                                  */
6730                                 /*
6731                                  * XXX sockets draft says that SCTP_EOF
6732                                  * should be sent with no data.  currently,
6733                                  * we will allow user data to be sent first
6734                                  * and move to SHUTDOWN-PENDING
6735                                  */
6736                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6737                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6738                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6739                                         if (asoc->locked_on_sending) {
6740                                                 /*
6741                                                  * Locked to send out the
6742                                                  * data
6743                                                  */
6744                                                 struct sctp_stream_queue_pending *sp;
6745
6746                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6747                                                 if (sp) {
6748                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6749                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6750                                                 }
6751                                         }
6752                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6753                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6754                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6755                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6756                                                 struct mbuf *op_err;
6757                                                 char msg[SCTP_DIAG_INFO_LEN];
6758
6759                                 abort_anyway:
6760                                                 snprintf(msg, sizeof(msg),
6761                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6762                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6763                                                     msg);
6764                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6765                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6766                                                     op_err, SCTP_SO_NOT_LOCKED);
6767                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6768                                                 goto no_chunk_output;
6769                                         }
6770                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6771                                             asoc->primary_destination);
6772                                 }
6773                         }
6774
6775                 }
6776         }
6777         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6778             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6779
6780         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6781             (stcb->asoc.total_flight > 0) &&
6782             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6783                 do_chunk_output = 0;
6784         }
6785         if (do_chunk_output)
6786                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6787         else if (added_control) {
6788                 int num_out, reason, now_filled = 0;
6789                 struct timeval now;
6790                 int frag_point;
6791
6792                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6793                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6794                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6795         }
6796 no_chunk_output:
6797         if (ret) {
6798                 ca->cnt_failed++;
6799         } else {
6800                 ca->cnt_sent++;
6801         }
6802 }
6803
6804 static void
6805 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6806 {
6807         struct sctp_copy_all *ca;
6808
6809         ca = (struct sctp_copy_all *)ptr;
6810         /*
6811          * Do a notify here? Kacheong suggests that the notify be done at
6812          * the send time.. so you would push up a notification if any send
6813          * failed. Don't know if this is feasible since the only failures we
6814          * have is "memory" related and if you cannot get an mbuf to send
6815          * the data you surely can't get an mbuf to send up to notify the
6816          * user you can't send the data :->
6817          */
6818
6819         /* now free everything */
6820         sctp_m_freem(ca->m);
6821         SCTP_FREE(ca, SCTP_M_COPYAL);
6822 }
6823
6824 static struct mbuf *
6825 sctp_copy_out_all(struct uio *uio, int len)
6826 {
6827         struct mbuf *ret, *at;
6828         int left, willcpy, cancpy, error;
6829
6830         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6831         if (ret == NULL) {
6832                 /* TSNH */
6833                 return (NULL);
6834         }
6835         left = len;
6836         SCTP_BUF_LEN(ret) = 0;
6837         /* save space for the data chunk header */
6838         cancpy = (int)M_TRAILINGSPACE(ret);
6839         willcpy = min(cancpy, left);
6840         at = ret;
6841         while (left > 0) {
6842                 /* Align data to the end */
6843                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6844                 if (error) {
6845         err_out_now:
6846                         sctp_m_freem(at);
6847                         return (NULL);
6848                 }
6849                 SCTP_BUF_LEN(at) = willcpy;
6850                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6851                 left -= willcpy;
6852                 if (left > 0) {
6853                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6854                         if (SCTP_BUF_NEXT(at) == NULL) {
6855                                 goto err_out_now;
6856                         }
6857                         at = SCTP_BUF_NEXT(at);
6858                         SCTP_BUF_LEN(at) = 0;
6859                         cancpy = (int)M_TRAILINGSPACE(at);
6860                         willcpy = min(cancpy, left);
6861                 }
6862         }
6863         return (ret);
6864 }
6865
6866 static int
6867 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6868     struct sctp_sndrcvinfo *srcv)
6869 {
6870         int ret;
6871         struct sctp_copy_all *ca;
6872
6873         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6874             SCTP_M_COPYAL);
6875         if (ca == NULL) {
6876                 sctp_m_freem(m);
6877                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6878                 return (ENOMEM);
6879         }
6880         memset(ca, 0, sizeof(struct sctp_copy_all));
6881
6882         ca->inp = inp;
6883         if (srcv) {
6884                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6885         }
6886         /*
6887          * take off the sendall flag, it would be bad if we failed to do
6888          * this :-0
6889          */
6890         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6891         /* get length and mbuf chain */
6892         if (uio) {
6893                 ca->sndlen = (int)uio->uio_resid;
6894                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6895                 if (ca->m == NULL) {
6896                         SCTP_FREE(ca, SCTP_M_COPYAL);
6897                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6898                         return (ENOMEM);
6899                 }
6900         } else {
6901                 /* Gather the length of the send */
6902                 struct mbuf *mat;
6903
6904                 ca->sndlen = 0;
6905                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6906                         ca->sndlen += SCTP_BUF_LEN(mat);
6907                 }
6908         }
6909         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6910             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6911             SCTP_ASOC_ANY_STATE,
6912             (void *)ca, 0,
6913             sctp_sendall_completes, inp, 1);
6914         if (ret) {
6915                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6916                 SCTP_FREE(ca, SCTP_M_COPYAL);
6917                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6918                 return (EFAULT);
6919         }
6920         return (0);
6921 }
6922
6923
6924 void
6925 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6926 {
6927         struct sctp_tmit_chunk *chk, *nchk;
6928
6929         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6930                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6931                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6932                         if (chk->data) {
6933                                 sctp_m_freem(chk->data);
6934                                 chk->data = NULL;
6935                         }
6936                         asoc->ctrl_queue_cnt--;
6937                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6938                 }
6939         }
6940 }
6941
6942 void
6943 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6944 {
6945         struct sctp_association *asoc;
6946         struct sctp_tmit_chunk *chk, *nchk;
6947         struct sctp_asconf_chunk *acp;
6948
6949         asoc = &stcb->asoc;
6950         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6951                 /* find SCTP_ASCONF chunk in queue */
6952                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6953                         if (chk->data) {
6954                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6955                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6956                                         /* Not Acked yet */
6957                                         break;
6958                                 }
6959                         }
6960                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6961                         if (chk->data) {
6962                                 sctp_m_freem(chk->data);
6963                                 chk->data = NULL;
6964                         }
6965                         asoc->ctrl_queue_cnt--;
6966                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6967                 }
6968         }
6969 }
6970
6971
6972 static void
6973 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6974     struct sctp_association *asoc,
6975     struct sctp_tmit_chunk **data_list,
6976     int bundle_at,
6977     struct sctp_nets *net)
6978 {
6979         int i;
6980         struct sctp_tmit_chunk *tp1;
6981
6982         for (i = 0; i < bundle_at; i++) {
6983                 /* off of the send queue */
6984                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6985                 asoc->send_queue_cnt--;
6986                 if (i > 0) {
6987                         /*
6988                          * Any chunk NOT 0 you zap the time chunk 0 gets
6989                          * zapped or set based on if a RTO measurment is
6990                          * needed.
6991                          */
6992                         data_list[i]->do_rtt = 0;
6993                 }
6994                 /* record time */
6995                 data_list[i]->sent_rcv_time = net->last_sent_time;
6996                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6997                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6998                 if (data_list[i]->whoTo == NULL) {
6999                         data_list[i]->whoTo = net;
7000                         atomic_add_int(&net->ref_count, 1);
7001                 }
7002                 /* on to the sent queue */
7003                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7004                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
7005                         struct sctp_tmit_chunk *tpp;
7006
7007                         /* need to move back */
7008         back_up_more:
7009                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7010                         if (tpp == NULL) {
7011                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7012                                 goto all_done;
7013                         }
7014                         tp1 = tpp;
7015                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
7016                                 goto back_up_more;
7017                         }
7018                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7019                 } else {
7020                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7021                             data_list[i],
7022                             sctp_next);
7023                 }
7024 all_done:
7025                 /* This does not lower until the cum-ack passes it */
7026                 asoc->sent_queue_cnt++;
7027                 if ((asoc->peers_rwnd <= 0) &&
7028                     (asoc->total_flight == 0) &&
7029                     (bundle_at == 1)) {
7030                         /* Mark the chunk as being a window probe */
7031                         SCTP_STAT_INCR(sctps_windowprobed);
7032                 }
7033 #ifdef SCTP_AUDITING_ENABLED
7034                 sctp_audit_log(0xC2, 3);
7035 #endif
7036                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7037                 data_list[i]->snd_count = 1;
7038                 data_list[i]->rec.data.chunk_was_revoked = 0;
7039                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7040                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7041                             data_list[i]->whoTo->flight_size,
7042                             data_list[i]->book_size,
7043                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
7044                             data_list[i]->rec.data.TSN_seq);
7045                 }
7046                 sctp_flight_size_increase(data_list[i]);
7047                 sctp_total_flight_increase(stcb, data_list[i]);
7048                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7049                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7050                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7051                 }
7052                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7053                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7054                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7055                         /* SWS sender side engages */
7056                         asoc->peers_rwnd = 0;
7057                 }
7058         }
7059         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7060                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7061         }
7062 }
7063
7064 static void
7065 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7066 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7067     SCTP_UNUSED
7068 #endif
7069 )
7070 {
7071         struct sctp_tmit_chunk *chk, *nchk;
7072
7073         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7074                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7075                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7076                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7077                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7078                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7079                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7080                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7081                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7082                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7083                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7084                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7085                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7086                         /* Stray chunks must be cleaned up */
7087         clean_up_anyway:
7088                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7089                         if (chk->data) {
7090                                 sctp_m_freem(chk->data);
7091                                 chk->data = NULL;
7092                         }
7093                         asoc->ctrl_queue_cnt--;
7094                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7095                                 asoc->fwd_tsn_cnt--;
7096                         sctp_free_a_chunk(stcb, chk, so_locked);
7097                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7098                         /* special handling, we must look into the param */
7099                         if (chk != asoc->str_reset) {
7100                                 goto clean_up_anyway;
7101                         }
7102                 }
7103         }
7104 }
7105
7106
7107 static int
7108 sctp_can_we_split_this(struct sctp_tcb *stcb,
7109     uint32_t length,
7110     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7111 {
7112         /*
7113          * Make a decision on if I should split a msg into multiple parts.
7114          * This is only asked of incomplete messages.
7115          */
7116         if (eeor_on) {
7117                 /*
7118                  * If we are doing EEOR we need to always send it if its the
7119                  * entire thing, since it might be all the guy is putting in
7120                  * the hopper.
7121                  */
7122                 if (goal_mtu >= length) {
7123                         /*-
7124                          * If we have data outstanding,
7125                          * we get another chance when the sack
7126                          * arrives to transmit - wait for more data
7127                          */
7128                         if (stcb->asoc.total_flight == 0) {
7129                                 /*
7130                                  * If nothing is in flight, we zero the
7131                                  * packet counter.
7132                                  */
7133                                 return (length);
7134                         }
7135                         return (0);
7136
7137                 } else {
7138                         /* You can fill the rest */
7139                         return (goal_mtu);
7140                 }
7141         }
7142         /*-
7143          * For those strange folk that make the send buffer
7144          * smaller than our fragmentation point, we can't
7145          * get a full msg in so we have to allow splitting.
7146          */
7147         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7148                 return (length);
7149         }
7150         if ((length <= goal_mtu) ||
7151             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7152                 /* Sub-optimial residual don't split in non-eeor mode. */
7153                 return (0);
7154         }
7155         /*
7156          * If we reach here length is larger than the goal_mtu. Do we wish
7157          * to split it for the sake of packet putting together?
7158          */
7159         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7160                 /* Its ok to split it */
7161                 return (min(goal_mtu, frag_point));
7162         }
7163         /* Nope, can't split */
7164         return (0);
7165
7166 }
7167
7168 static uint32_t
7169 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7170     struct sctp_stream_out *strq,
7171     uint32_t goal_mtu,
7172     uint32_t frag_point,
7173     int *locked,
7174     int *giveup,
7175     int eeor_mode,
7176     int *bail,
7177     int so_locked
7178 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7179     SCTP_UNUSED
7180 #endif
7181 )
7182 {
7183         /* Move from the stream to the send_queue keeping track of the total */
7184         struct sctp_association *asoc;
7185         struct sctp_stream_queue_pending *sp;
7186         struct sctp_tmit_chunk *chk;
7187         struct sctp_data_chunk *dchkh = NULL;
7188         struct sctp_idata_chunk *ndchkh = NULL;
7189         uint32_t to_move, length;
7190         int leading;
7191         uint8_t rcv_flags = 0;
7192         uint8_t some_taken;
7193         uint8_t send_lock_up = 0;
7194
7195         SCTP_TCB_LOCK_ASSERT(stcb);
7196         asoc = &stcb->asoc;
7197 one_more_time:
7198         /* sa_ignore FREED_MEMORY */
7199         *locked = 0;
7200         sp = TAILQ_FIRST(&strq->outqueue);
7201         if (sp == NULL) {
7202                 *locked = 0;
7203                 if (send_lock_up == 0) {
7204                         SCTP_TCB_SEND_LOCK(stcb);
7205                         send_lock_up = 1;
7206                 }
7207                 sp = TAILQ_FIRST(&strq->outqueue);
7208                 if (sp) {
7209                         goto one_more_time;
7210                 }
7211                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7212                     (stcb->asoc.idata_supported == 0) &&
7213                     (strq->last_msg_incomplete)) {
7214                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7215                             strq->stream_no,
7216                             strq->last_msg_incomplete);
7217                         strq->last_msg_incomplete = 0;
7218                 }
7219                 to_move = 0;
7220                 if (send_lock_up) {
7221                         SCTP_TCB_SEND_UNLOCK(stcb);
7222                         send_lock_up = 0;
7223                 }
7224                 goto out_of;
7225         }
7226         if ((sp->msg_is_complete) && (sp->length == 0)) {
7227                 if (sp->sender_all_done) {
7228                         /*
7229                          * We are doing differed cleanup. Last time through
7230                          * when we took all the data the sender_all_done was
7231                          * not set.
7232                          */
7233                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7234                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7235                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7236                                     sp->sender_all_done,
7237                                     sp->length,
7238                                     sp->msg_is_complete,
7239                                     sp->put_last_out,
7240                                     send_lock_up);
7241                         }
7242                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7243                                 SCTP_TCB_SEND_LOCK(stcb);
7244                                 send_lock_up = 1;
7245                         }
7246                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7247                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7248                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7249                             (strq->chunks_on_queues == 0) &&
7250                             TAILQ_EMPTY(&strq->outqueue)) {
7251                                 stcb->asoc.trigger_reset = 1;
7252                         }
7253                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7254                         if (sp->net) {
7255                                 sctp_free_remote_addr(sp->net);
7256                                 sp->net = NULL;
7257                         }
7258                         if (sp->data) {
7259                                 sctp_m_freem(sp->data);
7260                                 sp->data = NULL;
7261                         }
7262                         sctp_free_a_strmoq(stcb, sp, so_locked);
7263                         /* we can't be locked to it */
7264                         *locked = 0;
7265                         stcb->asoc.locked_on_sending = NULL;
7266                         if (send_lock_up) {
7267                                 SCTP_TCB_SEND_UNLOCK(stcb);
7268                                 send_lock_up = 0;
7269                         }
7270                         /* back to get the next msg */
7271                         goto one_more_time;
7272                 } else {
7273                         /*
7274                          * sender just finished this but still holds a
7275                          * reference
7276                          */
7277                         if (stcb->asoc.idata_supported == 0)
7278                                 *locked = 1;
7279                         *giveup = 1;
7280                         to_move = 0;
7281                         goto out_of;
7282                 }
7283         } else {
7284                 /* is there some to get */
7285                 if (sp->length == 0) {
7286                         /* no */
7287                         if (stcb->asoc.idata_supported == 0)
7288                                 *locked = 1;
7289                         *giveup = 1;
7290                         to_move = 0;
7291                         goto out_of;
7292                 } else if (sp->discard_rest) {
7293                         if (send_lock_up == 0) {
7294                                 SCTP_TCB_SEND_LOCK(stcb);
7295                                 send_lock_up = 1;
7296                         }
7297                         /* Whack down the size */
7298                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7299                         if ((stcb->sctp_socket != NULL) &&
7300                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7301                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7302                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7303                         }
7304                         if (sp->data) {
7305                                 sctp_m_freem(sp->data);
7306                                 sp->data = NULL;
7307                                 sp->tail_mbuf = NULL;
7308                         }
7309                         sp->length = 0;
7310                         sp->some_taken = 1;
7311                         if (stcb->asoc.idata_supported == 0)
7312                                 *locked = 1;
7313                         *giveup = 1;
7314                         to_move = 0;
7315                         goto out_of;
7316                 }
7317         }
7318         some_taken = sp->some_taken;
7319 re_look:
7320         length = sp->length;
7321         if (sp->msg_is_complete) {
7322                 /* The message is complete */
7323                 to_move = min(length, frag_point);
7324                 if (to_move == length) {
7325                         /* All of it fits in the MTU */
7326                         if (sp->some_taken) {
7327                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7328                         } else {
7329                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7330                         }
7331                         sp->put_last_out = 1;
7332                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7333                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7334                         }
7335                 } else {
7336                         /* Not all of it fits, we fragment */
7337                         if (sp->some_taken == 0) {
7338                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7339                         }
7340                         sp->some_taken = 1;
7341                 }
7342         } else {
7343                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7344                 if (to_move) {
7345                         /*-
7346                          * We use a snapshot of length in case it
7347                          * is expanding during the compare.
7348                          */
7349                         uint32_t llen;
7350
7351                         llen = length;
7352                         if (to_move >= llen) {
7353                                 to_move = llen;
7354                                 if (send_lock_up == 0) {
7355                                         /*-
7356                                          * We are taking all of an incomplete msg
7357                                          * thus we need a send lock.
7358                                          */
7359                                         SCTP_TCB_SEND_LOCK(stcb);
7360                                         send_lock_up = 1;
7361                                         if (sp->msg_is_complete) {
7362                                                 /*
7363                                                  * the sender finished the
7364                                                  * msg
7365                                                  */
7366                                                 goto re_look;
7367                                         }
7368                                 }
7369                         }
7370                         if (sp->some_taken == 0) {
7371                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7372                                 sp->some_taken = 1;
7373                         }
7374                 } else {
7375                         /* Nothing to take. */
7376                         if ((sp->some_taken) &&
7377                             (stcb->asoc.idata_supported == 0)) {
7378                                 *locked = 1;
7379                         }
7380                         *giveup = 1;
7381                         to_move = 0;
7382                         goto out_of;
7383                 }
7384         }
7385
7386         /* If we reach here, we can copy out a chunk */
7387         sctp_alloc_a_chunk(stcb, chk);
7388         if (chk == NULL) {
7389                 /* No chunk memory */
7390                 *giveup = 1;
7391                 to_move = 0;
7392                 goto out_of;
7393         }
7394         /*
7395          * Setup for unordered if needed by looking at the user sent info
7396          * flags.
7397          */
7398         if (sp->sinfo_flags & SCTP_UNORDERED) {
7399                 rcv_flags |= SCTP_DATA_UNORDERED;
7400         }
7401         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7402             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7403                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7404         }
7405         /* clear out the chunk before setting up */
7406         memset(chk, 0, sizeof(*chk));
7407         chk->rec.data.rcv_flags = rcv_flags;
7408
7409         if (to_move >= length) {
7410                 /* we think we can steal the whole thing */
7411                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7412                         SCTP_TCB_SEND_LOCK(stcb);
7413                         send_lock_up = 1;
7414                 }
7415                 if (to_move < sp->length) {
7416                         /* bail, it changed */
7417                         goto dont_do_it;
7418                 }
7419                 chk->data = sp->data;
7420                 chk->last_mbuf = sp->tail_mbuf;
7421                 /* register the stealing */
7422                 sp->data = sp->tail_mbuf = NULL;
7423         } else {
7424                 struct mbuf *m;
7425
7426 dont_do_it:
7427                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7428                 chk->last_mbuf = NULL;
7429                 if (chk->data == NULL) {
7430                         sp->some_taken = some_taken;
7431                         sctp_free_a_chunk(stcb, chk, so_locked);
7432                         *bail = 1;
7433                         to_move = 0;
7434                         goto out_of;
7435                 }
7436 #ifdef SCTP_MBUF_LOGGING
7437                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7438                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7439                 }
7440 #endif
7441                 /* Pull off the data */
7442                 m_adj(sp->data, to_move);
7443                 /* Now lets work our way down and compact it */
7444                 m = sp->data;
7445                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7446                         sp->data = SCTP_BUF_NEXT(m);
7447                         SCTP_BUF_NEXT(m) = NULL;
7448                         if (sp->tail_mbuf == m) {
7449                                 /*-
7450                                  * Freeing tail? TSNH since
7451                                  * we supposedly were taking less
7452                                  * than the sp->length.
7453                                  */
7454 #ifdef INVARIANTS
7455                                 panic("Huh, freing tail? - TSNH");
7456 #else
7457                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7458                                 sp->tail_mbuf = sp->data = NULL;
7459                                 sp->length = 0;
7460 #endif
7461
7462                         }
7463                         sctp_m_free(m);
7464                         m = sp->data;
7465                 }
7466         }
7467         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7468                 chk->copy_by_ref = 1;
7469         } else {
7470                 chk->copy_by_ref = 0;
7471         }
7472         /*
7473          * get last_mbuf and counts of mb usage This is ugly but hopefully
7474          * its only one mbuf.
7475          */
7476         if (chk->last_mbuf == NULL) {
7477                 chk->last_mbuf = chk->data;
7478                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7479                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7480                 }
7481         }
7482         if (to_move > length) {
7483                 /*- This should not happen either
7484                  * since we always lower to_move to the size
7485                  * of sp->length if its larger.
7486                  */
7487 #ifdef INVARIANTS
7488                 panic("Huh, how can to_move be larger?");
7489 #else
7490                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7491                 sp->length = 0;
7492 #endif
7493         } else {
7494                 atomic_subtract_int(&sp->length, to_move);
7495         }
7496         if (stcb->asoc.idata_supported == 0) {
7497                 leading = sizeof(struct sctp_data_chunk);
7498         } else {
7499                 leading = sizeof(struct sctp_idata_chunk);
7500         }
7501         if (M_LEADINGSPACE(chk->data) < leading) {
7502                 /* Not enough room for a chunk header, get some */
7503                 struct mbuf *m;
7504
7505                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7506                 if (m == NULL) {
7507                         /*
7508                          * we're in trouble here. _PREPEND below will free
7509                          * all the data if there is no leading space, so we
7510                          * must put the data back and restore.
7511                          */
7512                         if (send_lock_up == 0) {
7513                                 SCTP_TCB_SEND_LOCK(stcb);
7514                                 send_lock_up = 1;
7515                         }
7516                         if (sp->data == NULL) {
7517                                 /* unsteal the data */
7518                                 sp->data = chk->data;
7519                                 sp->tail_mbuf = chk->last_mbuf;
7520                         } else {
7521                                 struct mbuf *m_tmp;
7522
7523                                 /* reassemble the data */
7524                                 m_tmp = sp->data;
7525                                 sp->data = chk->data;
7526                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7527                         }
7528                         sp->some_taken = some_taken;
7529                         atomic_add_int(&sp->length, to_move);
7530                         chk->data = NULL;
7531                         *bail = 1;
7532                         sctp_free_a_chunk(stcb, chk, so_locked);
7533                         to_move = 0;
7534                         goto out_of;
7535                 } else {
7536                         SCTP_BUF_LEN(m) = 0;
7537                         SCTP_BUF_NEXT(m) = chk->data;
7538                         chk->data = m;
7539                         M_ALIGN(chk->data, 4);
7540                 }
7541         }
7542         if (stcb->asoc.idata_supported == 0) {
7543                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7544         } else {
7545                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7546         }
7547         if (chk->data == NULL) {
7548                 /* HELP, TSNH since we assured it would not above? */
7549 #ifdef INVARIANTS
7550                 panic("prepend failes HELP?");
7551 #else
7552                 SCTP_PRINTF("prepend fails HELP?\n");
7553                 sctp_free_a_chunk(stcb, chk, so_locked);
7554 #endif
7555                 *bail = 1;
7556                 to_move = 0;
7557                 goto out_of;
7558         }
7559         if (stcb->asoc.idata_supported == 0) {
7560                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7561                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_data_chunk));
7562         } else {
7563                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7564                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_idata_chunk));
7565         }
7566         chk->book_size_scale = 0;
7567         chk->sent = SCTP_DATAGRAM_UNSENT;
7568
7569         chk->flags = 0;
7570         chk->asoc = &stcb->asoc;
7571         chk->pad_inplace = 0;
7572         chk->no_fr_allowed = 0;
7573         if (stcb->asoc.idata_supported == 0) {
7574                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7575                         /* Just use 0. The receiver ignores the values. */
7576                         chk->rec.data.stream_seq = 0;
7577                 } else {
7578                         chk->rec.data.stream_seq = strq->next_mid_ordered;
7579                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7580                                 strq->next_mid_ordered++;
7581                         }
7582                 }
7583         } else {
7584                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7585                         chk->rec.data.stream_seq = strq->next_mid_unordered;
7586                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7587                                 strq->next_mid_unordered++;
7588                         }
7589                 } else {
7590                         chk->rec.data.stream_seq = strq->next_mid_ordered;
7591                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7592                                 strq->next_mid_ordered++;
7593                         }
7594                 }
7595         }
7596         chk->rec.data.stream_number = sp->stream;
7597         chk->rec.data.payloadtype = sp->ppid;
7598         chk->rec.data.context = sp->context;
7599         chk->rec.data.doing_fast_retransmit = 0;
7600
7601         chk->rec.data.timetodrop = sp->ts;
7602         chk->flags = sp->act_flags;
7603
7604         if (sp->net) {
7605                 chk->whoTo = sp->net;
7606                 atomic_add_int(&chk->whoTo->ref_count, 1);
7607         } else
7608                 chk->whoTo = NULL;
7609
7610         if (sp->holds_key_ref) {
7611                 chk->auth_keyid = sp->auth_keyid;
7612                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7613                 chk->holds_key_ref = 1;
7614         }
7615         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7616         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7617                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7618                     (uint32_t) (uintptr_t) stcb, sp->length,
7619                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7620                     chk->rec.data.TSN_seq);
7621         }
7622         if (stcb->asoc.idata_supported == 0) {
7623                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7624         } else {
7625                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7626         }
7627         /*
7628          * Put the rest of the things in place now. Size was done earlier in
7629          * previous loop prior to padding.
7630          */
7631
7632 #ifdef SCTP_ASOCLOG_OF_TSNS
7633         SCTP_TCB_LOCK_ASSERT(stcb);
7634         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7635                 asoc->tsn_out_at = 0;
7636                 asoc->tsn_out_wrapped = 1;
7637         }
7638         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7639         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7640         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7641         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7642         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7643         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7644         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7645         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7646         asoc->tsn_out_at++;
7647 #endif
7648         if (stcb->asoc.idata_supported == 0) {
7649                 dchkh->ch.chunk_type = SCTP_DATA;
7650                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7651                 dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7652                 dchkh->dp.stream_id = htons((strq->stream_no & 0x0000ffff));
7653                 dchkh->dp.stream_sequence = htons((uint16_t) chk->rec.data.stream_seq);
7654                 dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7655                 dchkh->ch.chunk_length = htons(chk->send_size);
7656         } else {
7657                 ndchkh->ch.chunk_type = SCTP_IDATA;
7658                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7659                 ndchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7660                 ndchkh->dp.stream_id = htons(strq->stream_no);
7661                 ndchkh->dp.reserved = htons(0);
7662                 ndchkh->dp.msg_id = htonl(chk->rec.data.stream_seq);
7663                 if (sp->fsn == 0)
7664                         ndchkh->dp.ppid_fsn.protocol_id = chk->rec.data.payloadtype;
7665                 else
7666                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7667                 sp->fsn++;
7668                 ndchkh->ch.chunk_length = htons(chk->send_size);
7669         }
7670         /* Now advance the chk->send_size by the actual pad needed. */
7671         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7672                 /* need a pad */
7673                 struct mbuf *lm;
7674                 int pads;
7675
7676                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7677                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7678                 if (lm != NULL) {
7679                         chk->last_mbuf = lm;
7680                         chk->pad_inplace = 1;
7681                 }
7682                 chk->send_size += pads;
7683         }
7684         if (PR_SCTP_ENABLED(chk->flags)) {
7685                 asoc->pr_sctp_cnt++;
7686         }
7687         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7688                 /* All done pull and kill the message */
7689                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7690                 if (sp->put_last_out == 0) {
7691                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7692                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7693                             sp->sender_all_done,
7694                             sp->length,
7695                             sp->msg_is_complete,
7696                             sp->put_last_out,
7697                             send_lock_up);
7698                 }
7699                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7700                         SCTP_TCB_SEND_LOCK(stcb);
7701                         send_lock_up = 1;
7702                 }
7703                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7704                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7705                     (strq->chunks_on_queues == 0) &&
7706                     TAILQ_EMPTY(&strq->outqueue)) {
7707                         stcb->asoc.trigger_reset = 1;
7708                 }
7709                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7710                 if (sp->net) {
7711                         sctp_free_remote_addr(sp->net);
7712                         sp->net = NULL;
7713                 }
7714                 if (sp->data) {
7715                         sctp_m_freem(sp->data);
7716                         sp->data = NULL;
7717                 }
7718                 sctp_free_a_strmoq(stcb, sp, so_locked);
7719
7720                 /* we can't be locked to it */
7721                 *locked = 0;
7722                 stcb->asoc.locked_on_sending = NULL;
7723         } else {
7724                 /* more to go, we are locked */
7725                 if (stcb->asoc.idata_supported == 0)
7726                         *locked = 1;
7727         }
7728         asoc->chunks_on_out_queue++;
7729         strq->chunks_on_queues++;
7730         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7731         asoc->send_queue_cnt++;
7732 out_of:
7733         if (send_lock_up) {
7734                 SCTP_TCB_SEND_UNLOCK(stcb);
7735         }
7736         return (to_move);
7737 }
7738
7739
7740 static void
7741 sctp_fill_outqueue(struct sctp_tcb *stcb,
7742     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7743 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7744     SCTP_UNUSED
7745 #endif
7746 )
7747 {
7748         struct sctp_association *asoc;
7749         struct sctp_stream_out *strq;
7750         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7751         int locked, giveup;
7752
7753         SCTP_TCB_LOCK_ASSERT(stcb);
7754         asoc = &stcb->asoc;
7755         switch (net->ro._l_addr.sa.sa_family) {
7756 #ifdef INET
7757         case AF_INET:
7758                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7759                 break;
7760 #endif
7761 #ifdef INET6
7762         case AF_INET6:
7763                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7764                 break;
7765 #endif
7766         default:
7767                 /* TSNH */
7768                 goal_mtu = net->mtu;
7769                 break;
7770         }
7771         /* Need an allowance for the data chunk header too */
7772         if (stcb->asoc.idata_supported == 0) {
7773                 goal_mtu -= sizeof(struct sctp_data_chunk);
7774         } else {
7775                 goal_mtu -= sizeof(struct sctp_idata_chunk);
7776         }
7777
7778         /* must make even word boundary */
7779         goal_mtu &= 0xfffffffc;
7780         if (asoc->locked_on_sending) {
7781                 /* We are stuck on one stream until the message completes. */
7782                 strq = asoc->locked_on_sending;
7783                 locked = 1;
7784         } else {
7785                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7786                 locked = 0;
7787         }
7788         while ((goal_mtu > 0) && strq) {
7789                 giveup = 0;
7790                 bail = 0;
7791                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7792                     &giveup, eeor_mode, &bail, so_locked);
7793                 if (moved_how_much)
7794                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7795
7796                 if (locked) {
7797                         asoc->locked_on_sending = strq;
7798                         if ((moved_how_much == 0) || (giveup) || bail)
7799                                 /* no more to move for now */
7800                                 break;
7801                 } else {
7802                         asoc->locked_on_sending = NULL;
7803                         if ((giveup) || bail) {
7804                                 break;
7805                         }
7806                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7807                         if (strq == NULL) {
7808                                 break;
7809                         }
7810                 }
7811                 total_moved += moved_how_much;
7812                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7813                 goal_mtu &= 0xfffffffc;
7814         }
7815         if (bail)
7816                 *quit_now = 1;
7817
7818         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7819
7820         if (total_moved == 0) {
7821                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7822                     (net == stcb->asoc.primary_destination)) {
7823                         /* ran dry for primary network net */
7824                         SCTP_STAT_INCR(sctps_primary_randry);
7825                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7826                         /* ran dry with CMT on */
7827                         SCTP_STAT_INCR(sctps_cmt_randry);
7828                 }
7829         }
7830 }
7831
7832 void
7833 sctp_fix_ecn_echo(struct sctp_association *asoc)
7834 {
7835         struct sctp_tmit_chunk *chk;
7836
7837         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7838                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7839                         chk->sent = SCTP_DATAGRAM_UNSENT;
7840                 }
7841         }
7842 }
7843
7844 void
7845 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7846 {
7847         struct sctp_association *asoc;
7848         struct sctp_tmit_chunk *chk;
7849         struct sctp_stream_queue_pending *sp;
7850         unsigned int i;
7851
7852         if (net == NULL) {
7853                 return;
7854         }
7855         asoc = &stcb->asoc;
7856         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7857                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7858                         if (sp->net == net) {
7859                                 sctp_free_remote_addr(sp->net);
7860                                 sp->net = NULL;
7861                         }
7862                 }
7863         }
7864         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7865                 if (chk->whoTo == net) {
7866                         sctp_free_remote_addr(chk->whoTo);
7867                         chk->whoTo = NULL;
7868                 }
7869         }
7870 }
7871
7872 int
7873 sctp_med_chunk_output(struct sctp_inpcb *inp,
7874     struct sctp_tcb *stcb,
7875     struct sctp_association *asoc,
7876     int *num_out,
7877     int *reason_code,
7878     int control_only, int from_where,
7879     struct timeval *now, int *now_filled, int frag_point, int so_locked
7880 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7881     SCTP_UNUSED
7882 #endif
7883 )
7884 {
7885         /**
7886          * Ok this is the generic chunk service queue. we must do the
7887          * following:
7888          * - Service the stream queue that is next, moving any
7889          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7890          *   LAST to the out queue in one pass) and assigning TSN's. This
7891          *   only applys though if the peer does not support NDATA. For NDATA
7892          *   chunks its ok to not send the entire message ;-)
7893          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7894          *   fomulate and send the low level chunks. Making sure to combine
7895          *   any control in the control chunk queue also.
7896          */
7897         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7898         struct mbuf *outchain, *endoutchain;
7899         struct sctp_tmit_chunk *chk, *nchk;
7900
7901         /* temp arrays for unlinking */
7902         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7903         int no_fragmentflg, error;
7904         unsigned int max_rwnd_per_dest, max_send_per_dest;
7905         int one_chunk, hbflag, skip_data_for_this_net;
7906         int asconf, cookie, no_out_cnt;
7907         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7908         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7909         int tsns_sent = 0;
7910         uint32_t auth_offset = 0;
7911         struct sctp_auth_chunk *auth = NULL;
7912         uint16_t auth_keyid;
7913         int override_ok = 1;
7914         int skip_fill_up = 0;
7915         int data_auth_reqd = 0;
7916
7917         /*
7918          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7919          * destination.
7920          */
7921         int quit_now = 0;
7922
7923         *num_out = 0;
7924         *reason_code = 0;
7925         auth_keyid = stcb->asoc.authinfo.active_keyid;
7926         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7927             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7928             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7929                 eeor_mode = 1;
7930         } else {
7931                 eeor_mode = 0;
7932         }
7933         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7934         /*
7935          * First lets prime the pump. For each destination, if there is room
7936          * in the flight size, attempt to pull an MTU's worth out of the
7937          * stream queues into the general send_queue
7938          */
7939 #ifdef SCTP_AUDITING_ENABLED
7940         sctp_audit_log(0xC2, 2);
7941 #endif
7942         SCTP_TCB_LOCK_ASSERT(stcb);
7943         hbflag = 0;
7944         if (control_only)
7945                 no_data_chunks = 1;
7946         else
7947                 no_data_chunks = 0;
7948
7949         /* Nothing to possible to send? */
7950         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7951             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7952             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7953             TAILQ_EMPTY(&asoc->send_queue) &&
7954             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7955 nothing_to_send:
7956                 *reason_code = 9;
7957                 return (0);
7958         }
7959         if (asoc->peers_rwnd == 0) {
7960                 /* No room in peers rwnd */
7961                 *reason_code = 1;
7962                 if (asoc->total_flight > 0) {
7963                         /* we are allowed one chunk in flight */
7964                         no_data_chunks = 1;
7965                 }
7966         }
7967         if (stcb->asoc.ecn_echo_cnt_onq) {
7968                 /* Record where a sack goes, if any */
7969                 if (no_data_chunks &&
7970                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7971                         /* Nothing but ECNe to send - we don't do that */
7972                         goto nothing_to_send;
7973                 }
7974                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7975                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7976                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7977                                 sack_goes_to = chk->whoTo;
7978                                 break;
7979                         }
7980                 }
7981         }
7982         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7983         if (stcb->sctp_socket)
7984                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7985         else
7986                 max_send_per_dest = 0;
7987         if (no_data_chunks == 0) {
7988                 /* How many non-directed chunks are there? */
7989                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7990                         if (chk->whoTo == NULL) {
7991                                 /*
7992                                  * We already have non-directed chunks on
7993                                  * the queue, no need to do a fill-up.
7994                                  */
7995                                 skip_fill_up = 1;
7996                                 break;
7997                         }
7998                 }
7999
8000         }
8001         if ((no_data_chunks == 0) &&
8002             (skip_fill_up == 0) &&
8003             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
8004                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
8005                         /*
8006                          * This for loop we are in takes in each net, if
8007                          * its's got space in cwnd and has data sent to it
8008                          * (when CMT is off) then it calls
8009                          * sctp_fill_outqueue for the net. This gets data on
8010                          * the send queue for that network.
8011                          *
8012                          * In sctp_fill_outqueue TSN's are assigned and data is
8013                          * copied out of the stream buffers. Note mostly
8014                          * copy by reference (we hope).
8015                          */
8016                         net->window_probe = 0;
8017                         if ((net != stcb->asoc.alternate) &&
8018                             ((net->dest_state & SCTP_ADDR_PF) ||
8019                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
8020                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
8021                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8022                                         sctp_log_cwnd(stcb, net, 1,
8023                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8024                                 }
8025                                 continue;
8026                         }
8027                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
8028                             (net->flight_size == 0)) {
8029                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
8030                         }
8031                         if (net->flight_size >= net->cwnd) {
8032                                 /* skip this network, no room - can't fill */
8033                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8034                                         sctp_log_cwnd(stcb, net, 3,
8035                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8036                                 }
8037                                 continue;
8038                         }
8039                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8040                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8041                         }
8042                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
8043                         if (quit_now) {
8044                                 /* memory alloc failure */
8045                                 no_data_chunks = 1;
8046                                 break;
8047                         }
8048                 }
8049         }
8050         /* now service each destination and send out what we can for it */
8051         /* Nothing to send? */
8052         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8053             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8054             TAILQ_EMPTY(&asoc->send_queue)) {
8055                 *reason_code = 8;
8056                 return (0);
8057         }
8058         if (asoc->sctp_cmt_on_off > 0) {
8059                 /* get the last start point */
8060                 start_at = asoc->last_net_cmt_send_started;
8061                 if (start_at == NULL) {
8062                         /* null so to beginning */
8063                         start_at = TAILQ_FIRST(&asoc->nets);
8064                 } else {
8065                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8066                         if (start_at == NULL) {
8067                                 start_at = TAILQ_FIRST(&asoc->nets);
8068                         }
8069                 }
8070                 asoc->last_net_cmt_send_started = start_at;
8071         } else {
8072                 start_at = TAILQ_FIRST(&asoc->nets);
8073         }
8074         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8075                 if (chk->whoTo == NULL) {
8076                         if (asoc->alternate) {
8077                                 chk->whoTo = asoc->alternate;
8078                         } else {
8079                                 chk->whoTo = asoc->primary_destination;
8080                         }
8081                         atomic_add_int(&chk->whoTo->ref_count, 1);
8082                 }
8083         }
8084         old_start_at = NULL;
8085 again_one_more_time:
8086         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8087                 /* how much can we send? */
8088                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8089                 if (old_start_at && (old_start_at == net)) {
8090                         /* through list ocmpletely. */
8091                         break;
8092                 }
8093                 tsns_sent = 0xa;
8094                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8095                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8096                     (net->flight_size >= net->cwnd)) {
8097                         /*
8098                          * Nothing on control or asconf and flight is full,
8099                          * we can skip even in the CMT case.
8100                          */
8101                         continue;
8102                 }
8103                 bundle_at = 0;
8104                 endoutchain = outchain = NULL;
8105                 no_fragmentflg = 1;
8106                 one_chunk = 0;
8107                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8108                         skip_data_for_this_net = 1;
8109                 } else {
8110                         skip_data_for_this_net = 0;
8111                 }
8112                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8113 #ifdef INET
8114                 case AF_INET:
8115                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8116                         break;
8117 #endif
8118 #ifdef INET6
8119                 case AF_INET6:
8120                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8121                         break;
8122 #endif
8123                 default:
8124                         /* TSNH */
8125                         mtu = net->mtu;
8126                         break;
8127                 }
8128                 mx_mtu = mtu;
8129                 to_out = 0;
8130                 if (mtu > asoc->peers_rwnd) {
8131                         if (asoc->total_flight > 0) {
8132                                 /* We have a packet in flight somewhere */
8133                                 r_mtu = asoc->peers_rwnd;
8134                         } else {
8135                                 /* We are always allowed to send one MTU out */
8136                                 one_chunk = 1;
8137                                 r_mtu = mtu;
8138                         }
8139                 } else {
8140                         r_mtu = mtu;
8141                 }
8142                 error = 0;
8143                 /************************/
8144                 /* ASCONF transmission */
8145                 /************************/
8146                 /* Now first lets go through the asconf queue */
8147                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8148                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8149                                 continue;
8150                         }
8151                         if (chk->whoTo == NULL) {
8152                                 if (asoc->alternate == NULL) {
8153                                         if (asoc->primary_destination != net) {
8154                                                 break;
8155                                         }
8156                                 } else {
8157                                         if (asoc->alternate != net) {
8158                                                 break;
8159                                         }
8160                                 }
8161                         } else {
8162                                 if (chk->whoTo != net) {
8163                                         break;
8164                                 }
8165                         }
8166                         if (chk->data == NULL) {
8167                                 break;
8168                         }
8169                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8170                             chk->sent != SCTP_DATAGRAM_RESEND) {
8171                                 break;
8172                         }
8173                         /*
8174                          * if no AUTH is yet included and this chunk
8175                          * requires it, make sure to account for it.  We
8176                          * don't apply the size until the AUTH chunk is
8177                          * actually added below in case there is no room for
8178                          * this chunk. NOTE: we overload the use of "omtu"
8179                          * here
8180                          */
8181                         if ((auth == NULL) &&
8182                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8183                             stcb->asoc.peer_auth_chunks)) {
8184                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8185                         } else
8186                                 omtu = 0;
8187                         /* Here we do NOT factor the r_mtu */
8188                         if ((chk->send_size < (int)(mtu - omtu)) ||
8189                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8190                                 /*
8191                                  * We probably should glom the mbuf chain
8192                                  * from the chk->data for control but the
8193                                  * problem is it becomes yet one more level
8194                                  * of tracking to do if for some reason
8195                                  * output fails. Then I have got to
8196                                  * reconstruct the merged control chain.. el
8197                                  * yucko.. for now we take the easy way and
8198                                  * do the copy
8199                                  */
8200                                 /*
8201                                  * Add an AUTH chunk, if chunk requires it
8202                                  * save the offset into the chain for AUTH
8203                                  */
8204                                 if ((auth == NULL) &&
8205                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8206                                     stcb->asoc.peer_auth_chunks))) {
8207                                         outchain = sctp_add_auth_chunk(outchain,
8208                                             &endoutchain,
8209                                             &auth,
8210                                             &auth_offset,
8211                                             stcb,
8212                                             chk->rec.chunk_id.id);
8213                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8214                                 }
8215                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8216                                     (int)chk->rec.chunk_id.can_take_data,
8217                                     chk->send_size, chk->copy_by_ref);
8218                                 if (outchain == NULL) {
8219                                         *reason_code = 8;
8220                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8221                                         return (ENOMEM);
8222                                 }
8223                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8224                                 /* update our MTU size */
8225                                 if (mtu > (chk->send_size + omtu))
8226                                         mtu -= (chk->send_size + omtu);
8227                                 else
8228                                         mtu = 0;
8229                                 to_out += (chk->send_size + omtu);
8230                                 /* Do clear IP_DF ? */
8231                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8232                                         no_fragmentflg = 0;
8233                                 }
8234                                 if (chk->rec.chunk_id.can_take_data)
8235                                         chk->data = NULL;
8236                                 /*
8237                                  * set hb flag since we can use these for
8238                                  * RTO
8239                                  */
8240                                 hbflag = 1;
8241                                 asconf = 1;
8242                                 /*
8243                                  * should sysctl this: don't bundle data
8244                                  * with ASCONF since it requires AUTH
8245                                  */
8246                                 no_data_chunks = 1;
8247                                 chk->sent = SCTP_DATAGRAM_SENT;
8248                                 if (chk->whoTo == NULL) {
8249                                         chk->whoTo = net;
8250                                         atomic_add_int(&net->ref_count, 1);
8251                                 }
8252                                 chk->snd_count++;
8253                                 if (mtu == 0) {
8254                                         /*
8255                                          * Ok we are out of room but we can
8256                                          * output without effecting the
8257                                          * flight size since this little guy
8258                                          * is a control only packet.
8259                                          */
8260                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8261                                         /*
8262                                          * do NOT clear the asconf flag as
8263                                          * it is used to do appropriate
8264                                          * source address selection.
8265                                          */
8266                                         if (*now_filled == 0) {
8267                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8268                                                 *now_filled = 1;
8269                                         }
8270                                         net->last_sent_time = *now;
8271                                         hbflag = 0;
8272                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8273                                             (struct sockaddr *)&net->ro._l_addr,
8274                                             outchain, auth_offset, auth,
8275                                             stcb->asoc.authinfo.active_keyid,
8276                                             no_fragmentflg, 0, asconf,
8277                                             inp->sctp_lport, stcb->rport,
8278                                             htonl(stcb->asoc.peer_vtag),
8279                                             net->port, NULL,
8280                                             0, 0,
8281                                             so_locked))) {
8282                                                 /*
8283                                                  * error, we could not
8284                                                  * output
8285                                                  */
8286                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8287                                                 if (from_where == 0) {
8288                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8289                                                 }
8290                                                 if (error == ENOBUFS) {
8291                                                         asoc->ifp_had_enobuf = 1;
8292                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8293                                                 }
8294                                                 /* error, could not output */
8295                                                 if (error == EHOSTUNREACH) {
8296                                                         /*
8297                                                          * Destination went
8298                                                          * unreachable
8299                                                          * during this send
8300                                                          */
8301                                                         sctp_move_chunks_from_net(stcb, net);
8302                                                 }
8303                                                 *reason_code = 7;
8304                                                 break;
8305                                         } else {
8306                                                 asoc->ifp_had_enobuf = 0;
8307                                         }
8308                                         /*
8309                                          * increase the number we sent, if a
8310                                          * cookie is sent we don't tell them
8311                                          * any was sent out.
8312                                          */
8313                                         outchain = endoutchain = NULL;
8314                                         auth = NULL;
8315                                         auth_offset = 0;
8316                                         if (!no_out_cnt)
8317                                                 *num_out += ctl_cnt;
8318                                         /* recalc a clean slate and setup */
8319                                         switch (net->ro._l_addr.sa.sa_family) {
8320 #ifdef INET
8321                                         case AF_INET:
8322                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8323                                                 break;
8324 #endif
8325 #ifdef INET6
8326                                         case AF_INET6:
8327                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8328                                                 break;
8329 #endif
8330                                         default:
8331                                                 /* TSNH */
8332                                                 mtu = net->mtu;
8333                                                 break;
8334                                         }
8335                                         to_out = 0;
8336                                         no_fragmentflg = 1;
8337                                 }
8338                         }
8339                 }
8340                 if (error != 0) {
8341                         /* try next net */
8342                         continue;
8343                 }
8344                 /************************/
8345                 /* Control transmission */
8346                 /************************/
8347                 /* Now first lets go through the control queue */
8348                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8349                         if ((sack_goes_to) &&
8350                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8351                             (chk->whoTo != sack_goes_to)) {
8352                                 /*
8353                                  * if we have a sack in queue, and we are
8354                                  * looking at an ecn echo that is NOT queued
8355                                  * to where the sack is going..
8356                                  */
8357                                 if (chk->whoTo == net) {
8358                                         /*
8359                                          * Don't transmit it to where its
8360                                          * going (current net)
8361                                          */
8362                                         continue;
8363                                 } else if (sack_goes_to == net) {
8364                                         /*
8365                                          * But do transmit it to this
8366                                          * address
8367                                          */
8368                                         goto skip_net_check;
8369                                 }
8370                         }
8371                         if (chk->whoTo == NULL) {
8372                                 if (asoc->alternate == NULL) {
8373                                         if (asoc->primary_destination != net) {
8374                                                 continue;
8375                                         }
8376                                 } else {
8377                                         if (asoc->alternate != net) {
8378                                                 continue;
8379                                         }
8380                                 }
8381                         } else {
8382                                 if (chk->whoTo != net) {
8383                                         continue;
8384                                 }
8385                         }
8386         skip_net_check:
8387                         if (chk->data == NULL) {
8388                                 continue;
8389                         }
8390                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8391                                 /*
8392                                  * It must be unsent. Cookies and ASCONF's
8393                                  * hang around but there timers will force
8394                                  * when marked for resend.
8395                                  */
8396                                 continue;
8397                         }
8398                         /*
8399                          * if no AUTH is yet included and this chunk
8400                          * requires it, make sure to account for it.  We
8401                          * don't apply the size until the AUTH chunk is
8402                          * actually added below in case there is no room for
8403                          * this chunk. NOTE: we overload the use of "omtu"
8404                          * here
8405                          */
8406                         if ((auth == NULL) &&
8407                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8408                             stcb->asoc.peer_auth_chunks)) {
8409                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8410                         } else
8411                                 omtu = 0;
8412                         /* Here we do NOT factor the r_mtu */
8413                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8414                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8415                                 /*
8416                                  * We probably should glom the mbuf chain
8417                                  * from the chk->data for control but the
8418                                  * problem is it becomes yet one more level
8419                                  * of tracking to do if for some reason
8420                                  * output fails. Then I have got to
8421                                  * reconstruct the merged control chain.. el
8422                                  * yucko.. for now we take the easy way and
8423                                  * do the copy
8424                                  */
8425                                 /*
8426                                  * Add an AUTH chunk, if chunk requires it
8427                                  * save the offset into the chain for AUTH
8428                                  */
8429                                 if ((auth == NULL) &&
8430                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8431                                     stcb->asoc.peer_auth_chunks))) {
8432                                         outchain = sctp_add_auth_chunk(outchain,
8433                                             &endoutchain,
8434                                             &auth,
8435                                             &auth_offset,
8436                                             stcb,
8437                                             chk->rec.chunk_id.id);
8438                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8439                                 }
8440                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8441                                     (int)chk->rec.chunk_id.can_take_data,
8442                                     chk->send_size, chk->copy_by_ref);
8443                                 if (outchain == NULL) {
8444                                         *reason_code = 8;
8445                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8446                                         return (ENOMEM);
8447                                 }
8448                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8449                                 /* update our MTU size */
8450                                 if (mtu > (chk->send_size + omtu))
8451                                         mtu -= (chk->send_size + omtu);
8452                                 else
8453                                         mtu = 0;
8454                                 to_out += (chk->send_size + omtu);
8455                                 /* Do clear IP_DF ? */
8456                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8457                                         no_fragmentflg = 0;
8458                                 }
8459                                 if (chk->rec.chunk_id.can_take_data)
8460                                         chk->data = NULL;
8461                                 /* Mark things to be removed, if needed */
8462                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8463                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8464                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8465                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8466                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8467                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8468                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8469                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8470                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8471                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8472                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8473                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8474                                                 hbflag = 1;
8475                                         }
8476                                         /* remove these chunks at the end */
8477                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8478                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8479                                                 /* turn off the timer */
8480                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8481                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8482                                                             inp, stcb, net,
8483                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8484                                                 }
8485                                         }
8486                                         ctl_cnt++;
8487                                 } else {
8488                                         /*
8489                                          * Other chunks, since they have
8490                                          * timers running (i.e. COOKIE) we
8491                                          * just "trust" that it gets sent or
8492                                          * retransmitted.
8493                                          */
8494                                         ctl_cnt++;
8495                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8496                                                 cookie = 1;
8497                                                 no_out_cnt = 1;
8498                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8499                                                 /*
8500                                                  * Increment ecne send count
8501                                                  * here this means we may be
8502                                                  * over-zealous in our
8503                                                  * counting if the send
8504                                                  * fails, but its the best
8505                                                  * place to do it (we used
8506                                                  * to do it in the queue of
8507                                                  * the chunk, but that did
8508                                                  * not tell how many times
8509                                                  * it was sent.
8510                                                  */
8511                                                 SCTP_STAT_INCR(sctps_sendecne);
8512                                         }
8513                                         chk->sent = SCTP_DATAGRAM_SENT;
8514                                         if (chk->whoTo == NULL) {
8515                                                 chk->whoTo = net;
8516                                                 atomic_add_int(&net->ref_count, 1);
8517                                         }
8518                                         chk->snd_count++;
8519                                 }
8520                                 if (mtu == 0) {
8521                                         /*
8522                                          * Ok we are out of room but we can
8523                                          * output without effecting the
8524                                          * flight size since this little guy
8525                                          * is a control only packet.
8526                                          */
8527                                         if (asconf) {
8528                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8529                                                 /*
8530                                                  * do NOT clear the asconf
8531                                                  * flag as it is used to do
8532                                                  * appropriate source
8533                                                  * address selection.
8534                                                  */
8535                                         }
8536                                         if (cookie) {
8537                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8538                                                 cookie = 0;
8539                                         }
8540                                         /* Only HB or ASCONF advances time */
8541                                         if (hbflag) {
8542                                                 if (*now_filled == 0) {
8543                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8544                                                         *now_filled = 1;
8545                                                 }
8546                                                 net->last_sent_time = *now;
8547                                                 hbflag = 0;
8548                                         }
8549                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8550                                             (struct sockaddr *)&net->ro._l_addr,
8551                                             outchain,
8552                                             auth_offset, auth,
8553                                             stcb->asoc.authinfo.active_keyid,
8554                                             no_fragmentflg, 0, asconf,
8555                                             inp->sctp_lport, stcb->rport,
8556                                             htonl(stcb->asoc.peer_vtag),
8557                                             net->port, NULL,
8558                                             0, 0,
8559                                             so_locked))) {
8560                                                 /*
8561                                                  * error, we could not
8562                                                  * output
8563                                                  */
8564                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8565                                                 if (from_where == 0) {
8566                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8567                                                 }
8568                                                 if (error == ENOBUFS) {
8569                                                         asoc->ifp_had_enobuf = 1;
8570                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8571                                                 }
8572                                                 if (error == EHOSTUNREACH) {
8573                                                         /*
8574                                                          * Destination went
8575                                                          * unreachable
8576                                                          * during this send
8577                                                          */
8578                                                         sctp_move_chunks_from_net(stcb, net);
8579                                                 }
8580                                                 *reason_code = 7;
8581                                                 break;
8582                                         } else {
8583                                                 asoc->ifp_had_enobuf = 0;
8584                                         }
8585                                         /*
8586                                          * increase the number we sent, if a
8587                                          * cookie is sent we don't tell them
8588                                          * any was sent out.
8589                                          */
8590                                         outchain = endoutchain = NULL;
8591                                         auth = NULL;
8592                                         auth_offset = 0;
8593                                         if (!no_out_cnt)
8594                                                 *num_out += ctl_cnt;
8595                                         /* recalc a clean slate and setup */
8596                                         switch (net->ro._l_addr.sa.sa_family) {
8597 #ifdef INET
8598                                         case AF_INET:
8599                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8600                                                 break;
8601 #endif
8602 #ifdef INET6
8603                                         case AF_INET6:
8604                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8605                                                 break;
8606 #endif
8607                                         default:
8608                                                 /* TSNH */
8609                                                 mtu = net->mtu;
8610                                                 break;
8611                                         }
8612                                         to_out = 0;
8613                                         no_fragmentflg = 1;
8614                                 }
8615                         }
8616                 }
8617                 if (error != 0) {
8618                         /* try next net */
8619                         continue;
8620                 }
8621                 /* JRI: if dest is in PF state, do not send data to it */
8622                 if ((asoc->sctp_cmt_on_off > 0) &&
8623                     (net != stcb->asoc.alternate) &&
8624                     (net->dest_state & SCTP_ADDR_PF)) {
8625                         goto no_data_fill;
8626                 }
8627                 if (net->flight_size >= net->cwnd) {
8628                         goto no_data_fill;
8629                 }
8630                 if ((asoc->sctp_cmt_on_off > 0) &&
8631                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8632                     (net->flight_size > max_rwnd_per_dest)) {
8633                         goto no_data_fill;
8634                 }
8635                 /*
8636                  * We need a specific accounting for the usage of the send
8637                  * buffer. We also need to check the number of messages per
8638                  * net. For now, this is better than nothing and it disabled
8639                  * by default...
8640                  */
8641                 if ((asoc->sctp_cmt_on_off > 0) &&
8642                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8643                     (max_send_per_dest > 0) &&
8644                     (net->flight_size > max_send_per_dest)) {
8645                         goto no_data_fill;
8646                 }
8647                 /*********************/
8648                 /* Data transmission */
8649                 /*********************/
8650                 /*
8651                  * if AUTH for DATA is required and no AUTH has been added
8652                  * yet, account for this in the mtu now... if no data can be
8653                  * bundled, this adjustment won't matter anyways since the
8654                  * packet will be going out...
8655                  */
8656                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8657                     stcb->asoc.peer_auth_chunks);
8658                 if (data_auth_reqd && (auth == NULL)) {
8659                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8660                 }
8661                 /* now lets add any data within the MTU constraints */
8662                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8663 #ifdef INET
8664                 case AF_INET:
8665                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8666                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8667                         else
8668                                 omtu = 0;
8669                         break;
8670 #endif
8671 #ifdef INET6
8672                 case AF_INET6:
8673                         if (net->mtu > SCTP_MIN_OVERHEAD)
8674                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8675                         else
8676                                 omtu = 0;
8677                         break;
8678 #endif
8679                 default:
8680                         /* TSNH */
8681                         omtu = 0;
8682                         break;
8683                 }
8684                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8685                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8686                     (skip_data_for_this_net == 0)) ||
8687                     (cookie)) {
8688                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8689                                 if (no_data_chunks) {
8690                                         /* let only control go out */
8691                                         *reason_code = 1;
8692                                         break;
8693                                 }
8694                                 if (net->flight_size >= net->cwnd) {
8695                                         /* skip this net, no room for data */
8696                                         *reason_code = 2;
8697                                         break;
8698                                 }
8699                                 if ((chk->whoTo != NULL) &&
8700                                     (chk->whoTo != net)) {
8701                                         /* Don't send the chunk on this net */
8702                                         continue;
8703                                 }
8704                                 if (asoc->sctp_cmt_on_off == 0) {
8705                                         if ((asoc->alternate) &&
8706                                             (asoc->alternate != net) &&
8707                                             (chk->whoTo == NULL)) {
8708                                                 continue;
8709                                         } else if ((net != asoc->primary_destination) &&
8710                                                     (asoc->alternate == NULL) &&
8711                                             (chk->whoTo == NULL)) {
8712                                                 continue;
8713                                         }
8714                                 }
8715                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8716                                         /*-
8717                                          * strange, we have a chunk that is
8718                                          * to big for its destination and
8719                                          * yet no fragment ok flag.
8720                                          * Something went wrong when the
8721                                          * PMTU changed...we did not mark
8722                                          * this chunk for some reason?? I
8723                                          * will fix it here by letting IP
8724                                          * fragment it for now and printing
8725                                          * a warning. This really should not
8726                                          * happen ...
8727                                          */
8728                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8729                                             chk->send_size, mtu);
8730                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8731                                 }
8732                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8733                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8734                                         struct sctp_data_chunk *dchkh;
8735
8736                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8737                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8738                                 }
8739                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8740                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8741                                         /* ok we will add this one */
8742
8743                                         /*
8744                                          * Add an AUTH chunk, if chunk
8745                                          * requires it, save the offset into
8746                                          * the chain for AUTH
8747                                          */
8748                                         if (data_auth_reqd) {
8749                                                 if (auth == NULL) {
8750                                                         outchain = sctp_add_auth_chunk(outchain,
8751                                                             &endoutchain,
8752                                                             &auth,
8753                                                             &auth_offset,
8754                                                             stcb,
8755                                                             SCTP_DATA);
8756                                                         auth_keyid = chk->auth_keyid;
8757                                                         override_ok = 0;
8758                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8759                                                 } else if (override_ok) {
8760                                                         /*
8761                                                          * use this data's
8762                                                          * keyid
8763                                                          */
8764                                                         auth_keyid = chk->auth_keyid;
8765                                                         override_ok = 0;
8766                                                 } else if (auth_keyid != chk->auth_keyid) {
8767                                                         /*
8768                                                          * different keyid,
8769                                                          * so done bundling
8770                                                          */
8771                                                         break;
8772                                                 }
8773                                         }
8774                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8775                                             chk->send_size, chk->copy_by_ref);
8776                                         if (outchain == NULL) {
8777                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8778                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8779                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8780                                                 }
8781                                                 *reason_code = 3;
8782                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8783                                                 return (ENOMEM);
8784                                         }
8785                                         /* upate our MTU size */
8786                                         /* Do clear IP_DF ? */
8787                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8788                                                 no_fragmentflg = 0;
8789                                         }
8790                                         /* unsigned subtraction of mtu */
8791                                         if (mtu > chk->send_size)
8792                                                 mtu -= chk->send_size;
8793                                         else
8794                                                 mtu = 0;
8795                                         /* unsigned subtraction of r_mtu */
8796                                         if (r_mtu > chk->send_size)
8797                                                 r_mtu -= chk->send_size;
8798                                         else
8799                                                 r_mtu = 0;
8800
8801                                         to_out += chk->send_size;
8802                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8803 #ifdef INVARIANTS
8804                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8805 #else
8806                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8807                                                     mx_mtu, to_out);
8808 #endif
8809                                         }
8810                                         chk->window_probe = 0;
8811                                         data_list[bundle_at++] = chk;
8812                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8813                                                 break;
8814                                         }
8815                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8816                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8817                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8818                                                 } else {
8819                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8820                                                 }
8821                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8822                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8823                                                         /*
8824                                                          * Count number of
8825                                                          * user msg's that
8826                                                          * were fragmented
8827                                                          * we do this by
8828                                                          * counting when we
8829                                                          * see a LAST
8830                                                          * fragment only.
8831                                                          */
8832                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8833                                         }
8834                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8835                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8836                                                         data_list[0]->window_probe = 1;
8837                                                         net->window_probe = 1;
8838                                                 }
8839                                                 break;
8840                                         }
8841                                 } else {
8842                                         /*
8843                                          * Must be sent in order of the
8844                                          * TSN's (on a network)
8845                                          */
8846                                         break;
8847                                 }
8848                         }       /* for (chunk gather loop for this net) */
8849                 }               /* if asoc.state OPEN */
8850 no_data_fill:
8851                 /* Is there something to send for this destination? */
8852                 if (outchain) {
8853                         /* We may need to start a control timer or two */
8854                         if (asconf) {
8855                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8856                                     stcb, net);
8857                                 /*
8858                                  * do NOT clear the asconf flag as it is
8859                                  * used to do appropriate source address
8860                                  * selection.
8861                                  */
8862                         }
8863                         if (cookie) {
8864                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8865                                 cookie = 0;
8866                         }
8867                         /* must start a send timer if data is being sent */
8868                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8869                                 /*
8870                                  * no timer running on this destination
8871                                  * restart it.
8872                                  */
8873                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8874                         }
8875                         if (bundle_at || hbflag) {
8876                                 /* For data/asconf and hb set time */
8877                                 if (*now_filled == 0) {
8878                                         (void)SCTP_GETTIME_TIMEVAL(now);
8879                                         *now_filled = 1;
8880                                 }
8881                                 net->last_sent_time = *now;
8882                         }
8883                         /* Now send it, if there is anything to send :> */
8884                         if ((error = sctp_lowlevel_chunk_output(inp,
8885                             stcb,
8886                             net,
8887                             (struct sockaddr *)&net->ro._l_addr,
8888                             outchain,
8889                             auth_offset,
8890                             auth,
8891                             auth_keyid,
8892                             no_fragmentflg,
8893                             bundle_at,
8894                             asconf,
8895                             inp->sctp_lport, stcb->rport,
8896                             htonl(stcb->asoc.peer_vtag),
8897                             net->port, NULL,
8898                             0, 0,
8899                             so_locked))) {
8900                                 /* error, we could not output */
8901                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8902                                 if (from_where == 0) {
8903                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8904                                 }
8905                                 if (error == ENOBUFS) {
8906                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8907                                         asoc->ifp_had_enobuf = 1;
8908                                 }
8909                                 if (error == EHOSTUNREACH) {
8910                                         /*
8911                                          * Destination went unreachable
8912                                          * during this send
8913                                          */
8914                                         sctp_move_chunks_from_net(stcb, net);
8915                                 }
8916                                 *reason_code = 6;
8917                                 /*-
8918                                  * I add this line to be paranoid. As far as
8919                                  * I can tell the continue, takes us back to
8920                                  * the top of the for, but just to make sure
8921                                  * I will reset these again here.
8922                                  */
8923                                 ctl_cnt = bundle_at = 0;
8924                                 continue;       /* This takes us back to the
8925                                                  * for() for the nets. */
8926                         } else {
8927                                 asoc->ifp_had_enobuf = 0;
8928                         }
8929                         endoutchain = NULL;
8930                         auth = NULL;
8931                         auth_offset = 0;
8932                         if (!no_out_cnt) {
8933                                 *num_out += (ctl_cnt + bundle_at);
8934                         }
8935                         if (bundle_at) {
8936                                 /* setup for a RTO measurement */
8937                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8938                                 /* fill time if not already filled */
8939                                 if (*now_filled == 0) {
8940                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8941                                         *now_filled = 1;
8942                                         *now = asoc->time_last_sent;
8943                                 } else {
8944                                         asoc->time_last_sent = *now;
8945                                 }
8946                                 if (net->rto_needed) {
8947                                         data_list[0]->do_rtt = 1;
8948                                         net->rto_needed = 0;
8949                                 }
8950                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8951                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8952                         }
8953                         if (one_chunk) {
8954                                 break;
8955                         }
8956                 }
8957                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8958                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8959                 }
8960         }
8961         if (old_start_at == NULL) {
8962                 old_start_at = start_at;
8963                 start_at = TAILQ_FIRST(&asoc->nets);
8964                 if (old_start_at)
8965                         goto again_one_more_time;
8966         }
8967         /*
8968          * At the end there should be no NON timed chunks hanging on this
8969          * queue.
8970          */
8971         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8972                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8973         }
8974         if ((*num_out == 0) && (*reason_code == 0)) {
8975                 *reason_code = 4;
8976         } else {
8977                 *reason_code = 5;
8978         }
8979         sctp_clean_up_ctl(stcb, asoc, so_locked);
8980         return (0);
8981 }
8982
8983 void
8984 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8985 {
8986         /*-
8987          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8988          * the control chunk queue.
8989          */
8990         struct sctp_chunkhdr *hdr;
8991         struct sctp_tmit_chunk *chk;
8992         struct mbuf *mat, *last_mbuf;
8993         uint32_t chunk_length;
8994         uint16_t padding_length;
8995
8996         SCTP_TCB_LOCK_ASSERT(stcb);
8997         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8998         if (op_err == NULL) {
8999                 return;
9000         }
9001         last_mbuf = NULL;
9002         chunk_length = 0;
9003         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
9004                 chunk_length += SCTP_BUF_LEN(mat);
9005                 if (SCTP_BUF_NEXT(mat) == NULL) {
9006                         last_mbuf = mat;
9007                 }
9008         }
9009         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
9010                 sctp_m_freem(op_err);
9011                 return;
9012         }
9013         padding_length = chunk_length % 4;
9014         if (padding_length != 0) {
9015                 padding_length = 4 - padding_length;
9016         }
9017         if (padding_length != 0) {
9018                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
9019                         sctp_m_freem(op_err);
9020                         return;
9021                 }
9022         }
9023         sctp_alloc_a_chunk(stcb, chk);
9024         if (chk == NULL) {
9025                 /* no memory */
9026                 sctp_m_freem(op_err);
9027                 return;
9028         }
9029         chk->copy_by_ref = 0;
9030         chk->send_size = (uint16_t) chunk_length;
9031         chk->sent = SCTP_DATAGRAM_UNSENT;
9032         chk->snd_count = 0;
9033         chk->asoc = &stcb->asoc;
9034         chk->data = op_err;
9035         chk->whoTo = NULL;
9036         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
9037         chk->rec.chunk_id.can_take_data = 0;
9038         hdr = mtod(op_err, struct sctp_chunkhdr *);
9039         hdr->chunk_type = SCTP_OPERATION_ERROR;
9040         hdr->chunk_flags = 0;
9041         hdr->chunk_length = htons(chk->send_size);
9042         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9043         chk->asoc->ctrl_queue_cnt++;
9044 }
9045
9046 int
9047 sctp_send_cookie_echo(struct mbuf *m,
9048     int offset,
9049     struct sctp_tcb *stcb,
9050     struct sctp_nets *net)
9051 {
9052         /*-
9053          * pull out the cookie and put it at the front of the control chunk
9054          * queue.
9055          */
9056         int at;
9057         struct mbuf *cookie;
9058         struct sctp_paramhdr parm, *phdr;
9059         struct sctp_chunkhdr *hdr;
9060         struct sctp_tmit_chunk *chk;
9061         uint16_t ptype, plen;
9062
9063         SCTP_TCB_LOCK_ASSERT(stcb);
9064         /* First find the cookie in the param area */
9065         cookie = NULL;
9066         at = offset + sizeof(struct sctp_init_chunk);
9067         for (;;) {
9068                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
9069                 if (phdr == NULL) {
9070                         return (-3);
9071                 }
9072                 ptype = ntohs(phdr->param_type);
9073                 plen = ntohs(phdr->param_length);
9074                 if (ptype == SCTP_STATE_COOKIE) {
9075                         int pad;
9076
9077                         /* found the cookie */
9078                         if ((pad = (plen % 4))) {
9079                                 plen += 4 - pad;
9080                         }
9081                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9082                         if (cookie == NULL) {
9083                                 /* No memory */
9084                                 return (-2);
9085                         }
9086 #ifdef SCTP_MBUF_LOGGING
9087                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9088                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9089                         }
9090 #endif
9091                         break;
9092                 }
9093                 at += SCTP_SIZE32(plen);
9094         }
9095         /* ok, we got the cookie lets change it into a cookie echo chunk */
9096         /* first the change from param to cookie */
9097         hdr = mtod(cookie, struct sctp_chunkhdr *);
9098         hdr->chunk_type = SCTP_COOKIE_ECHO;
9099         hdr->chunk_flags = 0;
9100         /* get the chunk stuff now and place it in the FRONT of the queue */
9101         sctp_alloc_a_chunk(stcb, chk);
9102         if (chk == NULL) {
9103                 /* no memory */
9104                 sctp_m_freem(cookie);
9105                 return (-5);
9106         }
9107         chk->copy_by_ref = 0;
9108         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9109         chk->rec.chunk_id.can_take_data = 0;
9110         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9111         chk->send_size = plen;
9112         chk->sent = SCTP_DATAGRAM_UNSENT;
9113         chk->snd_count = 0;
9114         chk->asoc = &stcb->asoc;
9115         chk->data = cookie;
9116         chk->whoTo = net;
9117         atomic_add_int(&chk->whoTo->ref_count, 1);
9118         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9119         chk->asoc->ctrl_queue_cnt++;
9120         return (0);
9121 }
9122
9123 void
9124 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9125     struct mbuf *m,
9126     int offset,
9127     int chk_length,
9128     struct sctp_nets *net)
9129 {
9130         /*
9131          * take a HB request and make it into a HB ack and send it.
9132          */
9133         struct mbuf *outchain;
9134         struct sctp_chunkhdr *chdr;
9135         struct sctp_tmit_chunk *chk;
9136
9137
9138         if (net == NULL)
9139                 /* must have a net pointer */
9140                 return;
9141
9142         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9143         if (outchain == NULL) {
9144                 /* gak out of memory */
9145                 return;
9146         }
9147 #ifdef SCTP_MBUF_LOGGING
9148         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9149                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9150         }
9151 #endif
9152         chdr = mtod(outchain, struct sctp_chunkhdr *);
9153         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9154         chdr->chunk_flags = 0;
9155         if (chk_length % 4) {
9156                 /* need pad */
9157                 uint32_t cpthis = 0;
9158                 int padlen;
9159
9160                 padlen = 4 - (chk_length % 4);
9161                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9162         }
9163         sctp_alloc_a_chunk(stcb, chk);
9164         if (chk == NULL) {
9165                 /* no memory */
9166                 sctp_m_freem(outchain);
9167                 return;
9168         }
9169         chk->copy_by_ref = 0;
9170         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9171         chk->rec.chunk_id.can_take_data = 1;
9172         chk->flags = 0;
9173         chk->send_size = chk_length;
9174         chk->sent = SCTP_DATAGRAM_UNSENT;
9175         chk->snd_count = 0;
9176         chk->asoc = &stcb->asoc;
9177         chk->data = outchain;
9178         chk->whoTo = net;
9179         atomic_add_int(&chk->whoTo->ref_count, 1);
9180         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9181         chk->asoc->ctrl_queue_cnt++;
9182 }
9183
9184 void
9185 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9186 {
9187         /* formulate and queue a cookie-ack back to sender */
9188         struct mbuf *cookie_ack;
9189         struct sctp_chunkhdr *hdr;
9190         struct sctp_tmit_chunk *chk;
9191
9192         SCTP_TCB_LOCK_ASSERT(stcb);
9193
9194         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9195         if (cookie_ack == NULL) {
9196                 /* no mbuf's */
9197                 return;
9198         }
9199         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9200         sctp_alloc_a_chunk(stcb, chk);
9201         if (chk == NULL) {
9202                 /* no memory */
9203                 sctp_m_freem(cookie_ack);
9204                 return;
9205         }
9206         chk->copy_by_ref = 0;
9207         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9208         chk->rec.chunk_id.can_take_data = 1;
9209         chk->flags = 0;
9210         chk->send_size = sizeof(struct sctp_chunkhdr);
9211         chk->sent = SCTP_DATAGRAM_UNSENT;
9212         chk->snd_count = 0;
9213         chk->asoc = &stcb->asoc;
9214         chk->data = cookie_ack;
9215         if (chk->asoc->last_control_chunk_from != NULL) {
9216                 chk->whoTo = chk->asoc->last_control_chunk_from;
9217                 atomic_add_int(&chk->whoTo->ref_count, 1);
9218         } else {
9219                 chk->whoTo = NULL;
9220         }
9221         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9222         hdr->chunk_type = SCTP_COOKIE_ACK;
9223         hdr->chunk_flags = 0;
9224         hdr->chunk_length = htons(chk->send_size);
9225         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9226         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9227         chk->asoc->ctrl_queue_cnt++;
9228         return;
9229 }
9230
9231
9232 void
9233 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9234 {
9235         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9236         struct mbuf *m_shutdown_ack;
9237         struct sctp_shutdown_ack_chunk *ack_cp;
9238         struct sctp_tmit_chunk *chk;
9239
9240         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9241         if (m_shutdown_ack == NULL) {
9242                 /* no mbuf's */
9243                 return;
9244         }
9245         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9246         sctp_alloc_a_chunk(stcb, chk);
9247         if (chk == NULL) {
9248                 /* no memory */
9249                 sctp_m_freem(m_shutdown_ack);
9250                 return;
9251         }
9252         chk->copy_by_ref = 0;
9253         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9254         chk->rec.chunk_id.can_take_data = 1;
9255         chk->flags = 0;
9256         chk->send_size = sizeof(struct sctp_chunkhdr);
9257         chk->sent = SCTP_DATAGRAM_UNSENT;
9258         chk->snd_count = 0;
9259         chk->flags = 0;
9260         chk->asoc = &stcb->asoc;
9261         chk->data = m_shutdown_ack;
9262         chk->whoTo = net;
9263         if (chk->whoTo) {
9264                 atomic_add_int(&chk->whoTo->ref_count, 1);
9265         }
9266         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9267         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9268         ack_cp->ch.chunk_flags = 0;
9269         ack_cp->ch.chunk_length = htons(chk->send_size);
9270         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9271         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9272         chk->asoc->ctrl_queue_cnt++;
9273         return;
9274 }
9275
9276 void
9277 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9278 {
9279         /* formulate and queue a SHUTDOWN to the sender */
9280         struct mbuf *m_shutdown;
9281         struct sctp_shutdown_chunk *shutdown_cp;
9282         struct sctp_tmit_chunk *chk;
9283
9284         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9285         if (m_shutdown == NULL) {
9286                 /* no mbuf's */
9287                 return;
9288         }
9289         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9290         sctp_alloc_a_chunk(stcb, chk);
9291         if (chk == NULL) {
9292                 /* no memory */
9293                 sctp_m_freem(m_shutdown);
9294                 return;
9295         }
9296         chk->copy_by_ref = 0;
9297         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9298         chk->rec.chunk_id.can_take_data = 1;
9299         chk->flags = 0;
9300         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9301         chk->sent = SCTP_DATAGRAM_UNSENT;
9302         chk->snd_count = 0;
9303         chk->flags = 0;
9304         chk->asoc = &stcb->asoc;
9305         chk->data = m_shutdown;
9306         chk->whoTo = net;
9307         if (chk->whoTo) {
9308                 atomic_add_int(&chk->whoTo->ref_count, 1);
9309         }
9310         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9311         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9312         shutdown_cp->ch.chunk_flags = 0;
9313         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9314         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9315         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9316         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9317         chk->asoc->ctrl_queue_cnt++;
9318         return;
9319 }
9320
9321 void
9322 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9323 {
9324         /*
9325          * formulate and queue an ASCONF to the peer. ASCONF parameters
9326          * should be queued on the assoc queue.
9327          */
9328         struct sctp_tmit_chunk *chk;
9329         struct mbuf *m_asconf;
9330         int len;
9331
9332         SCTP_TCB_LOCK_ASSERT(stcb);
9333
9334         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9335             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9336                 /* can't send a new one if there is one in flight already */
9337                 return;
9338         }
9339         /* compose an ASCONF chunk, maximum length is PMTU */
9340         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9341         if (m_asconf == NULL) {
9342                 return;
9343         }
9344         sctp_alloc_a_chunk(stcb, chk);
9345         if (chk == NULL) {
9346                 /* no memory */
9347                 sctp_m_freem(m_asconf);
9348                 return;
9349         }
9350         chk->copy_by_ref = 0;
9351         chk->rec.chunk_id.id = SCTP_ASCONF;
9352         chk->rec.chunk_id.can_take_data = 0;
9353         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9354         chk->data = m_asconf;
9355         chk->send_size = len;
9356         chk->sent = SCTP_DATAGRAM_UNSENT;
9357         chk->snd_count = 0;
9358         chk->asoc = &stcb->asoc;
9359         chk->whoTo = net;
9360         if (chk->whoTo) {
9361                 atomic_add_int(&chk->whoTo->ref_count, 1);
9362         }
9363         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9364         chk->asoc->ctrl_queue_cnt++;
9365         return;
9366 }
9367
9368 void
9369 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9370 {
9371         /*
9372          * formulate and queue a asconf-ack back to sender. the asconf-ack
9373          * must be stored in the tcb.
9374          */
9375         struct sctp_tmit_chunk *chk;
9376         struct sctp_asconf_ack *ack, *latest_ack;
9377         struct mbuf *m_ack;
9378         struct sctp_nets *net = NULL;
9379
9380         SCTP_TCB_LOCK_ASSERT(stcb);
9381         /* Get the latest ASCONF-ACK */
9382         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9383         if (latest_ack == NULL) {
9384                 return;
9385         }
9386         if (latest_ack->last_sent_to != NULL &&
9387             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9388                 /* we're doing a retransmission */
9389                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9390                 if (net == NULL) {
9391                         /* no alternate */
9392                         if (stcb->asoc.last_control_chunk_from == NULL) {
9393                                 if (stcb->asoc.alternate) {
9394                                         net = stcb->asoc.alternate;
9395                                 } else {
9396                                         net = stcb->asoc.primary_destination;
9397                                 }
9398                         } else {
9399                                 net = stcb->asoc.last_control_chunk_from;
9400                         }
9401                 }
9402         } else {
9403                 /* normal case */
9404                 if (stcb->asoc.last_control_chunk_from == NULL) {
9405                         if (stcb->asoc.alternate) {
9406                                 net = stcb->asoc.alternate;
9407                         } else {
9408                                 net = stcb->asoc.primary_destination;
9409                         }
9410                 } else {
9411                         net = stcb->asoc.last_control_chunk_from;
9412                 }
9413         }
9414         latest_ack->last_sent_to = net;
9415
9416         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9417                 if (ack->data == NULL) {
9418                         continue;
9419                 }
9420                 /* copy the asconf_ack */
9421                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9422                 if (m_ack == NULL) {
9423                         /* couldn't copy it */
9424                         return;
9425                 }
9426 #ifdef SCTP_MBUF_LOGGING
9427                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9428                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9429                 }
9430 #endif
9431
9432                 sctp_alloc_a_chunk(stcb, chk);
9433                 if (chk == NULL) {
9434                         /* no memory */
9435                         if (m_ack)
9436                                 sctp_m_freem(m_ack);
9437                         return;
9438                 }
9439                 chk->copy_by_ref = 0;
9440                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9441                 chk->rec.chunk_id.can_take_data = 1;
9442                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9443                 chk->whoTo = net;
9444                 if (chk->whoTo) {
9445                         atomic_add_int(&chk->whoTo->ref_count, 1);
9446                 }
9447                 chk->data = m_ack;
9448                 chk->send_size = ack->len;
9449                 chk->sent = SCTP_DATAGRAM_UNSENT;
9450                 chk->snd_count = 0;
9451                 chk->asoc = &stcb->asoc;
9452
9453                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9454                 chk->asoc->ctrl_queue_cnt++;
9455         }
9456         return;
9457 }
9458
9459
9460 static int
9461 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9462     struct sctp_tcb *stcb,
9463     struct sctp_association *asoc,
9464     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9465 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9466     SCTP_UNUSED
9467 #endif
9468 )
9469 {
9470         /*-
9471          * send out one MTU of retransmission. If fast_retransmit is
9472          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9473          * rwnd. For a Cookie or Asconf in the control chunk queue we
9474          * retransmit them by themselves.
9475          *
9476          * For data chunks we will pick out the lowest TSN's in the sent_queue
9477          * marked for resend and bundle them all together (up to a MTU of
9478          * destination). The address to send to should have been
9479          * selected/changed where the retransmission was marked (i.e. in FR
9480          * or t3-timeout routines).
9481          */
9482         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9483         struct sctp_tmit_chunk *chk, *fwd;
9484         struct mbuf *m, *endofchain;
9485         struct sctp_nets *net = NULL;
9486         uint32_t tsns_sent = 0;
9487         int no_fragmentflg, bundle_at, cnt_thru;
9488         unsigned int mtu;
9489         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9490         struct sctp_auth_chunk *auth = NULL;
9491         uint32_t auth_offset = 0;
9492         uint16_t auth_keyid;
9493         int override_ok = 1;
9494         int data_auth_reqd = 0;
9495         uint32_t dmtu = 0;
9496
9497         SCTP_TCB_LOCK_ASSERT(stcb);
9498         tmr_started = ctl_cnt = bundle_at = error = 0;
9499         no_fragmentflg = 1;
9500         fwd_tsn = 0;
9501         *cnt_out = 0;
9502         fwd = NULL;
9503         endofchain = m = NULL;
9504         auth_keyid = stcb->asoc.authinfo.active_keyid;
9505 #ifdef SCTP_AUDITING_ENABLED
9506         sctp_audit_log(0xC3, 1);
9507 #endif
9508         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9509             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9510                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9511                     asoc->sent_queue_retran_cnt);
9512                 asoc->sent_queue_cnt = 0;
9513                 asoc->sent_queue_cnt_removeable = 0;
9514                 /* send back 0/0 so we enter normal transmission */
9515                 *cnt_out = 0;
9516                 return (0);
9517         }
9518         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9519                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9520                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9521                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9522                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9523                                 continue;
9524                         }
9525                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9526                                 if (chk != asoc->str_reset) {
9527                                         /*
9528                                          * not eligible for retran if its
9529                                          * not ours
9530                                          */
9531                                         continue;
9532                                 }
9533                         }
9534                         ctl_cnt++;
9535                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9536                                 fwd_tsn = 1;
9537                         }
9538                         /*
9539                          * Add an AUTH chunk, if chunk requires it save the
9540                          * offset into the chain for AUTH
9541                          */
9542                         if ((auth == NULL) &&
9543                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9544                             stcb->asoc.peer_auth_chunks))) {
9545                                 m = sctp_add_auth_chunk(m, &endofchain,
9546                                     &auth, &auth_offset,
9547                                     stcb,
9548                                     chk->rec.chunk_id.id);
9549                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9550                         }
9551                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9552                         break;
9553                 }
9554         }
9555         one_chunk = 0;
9556         cnt_thru = 0;
9557         /* do we have control chunks to retransmit? */
9558         if (m != NULL) {
9559                 /* Start a timer no matter if we succeed or fail */
9560                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9561                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9562                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9563                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9564                 chk->snd_count++;       /* update our count */
9565                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9566                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9567                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9568                     no_fragmentflg, 0, 0,
9569                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9570                     chk->whoTo->port, NULL,
9571                     0, 0,
9572                     so_locked))) {
9573                         SCTP_STAT_INCR(sctps_lowlevelerr);
9574                         return (error);
9575                 }
9576                 endofchain = NULL;
9577                 auth = NULL;
9578                 auth_offset = 0;
9579                 /*
9580                  * We don't want to mark the net->sent time here since this
9581                  * we use this for HB and retrans cannot measure RTT
9582                  */
9583                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9584                 *cnt_out += 1;
9585                 chk->sent = SCTP_DATAGRAM_SENT;
9586                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9587                 if (fwd_tsn == 0) {
9588                         return (0);
9589                 } else {
9590                         /* Clean up the fwd-tsn list */
9591                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9592                         return (0);
9593                 }
9594         }
9595         /*
9596          * Ok, it is just data retransmission we need to do or that and a
9597          * fwd-tsn with it all.
9598          */
9599         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9600                 return (SCTP_RETRAN_DONE);
9601         }
9602         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9603             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9604                 /* not yet open, resend the cookie and that is it */
9605                 return (1);
9606         }
9607 #ifdef SCTP_AUDITING_ENABLED
9608         sctp_auditing(20, inp, stcb, NULL);
9609 #endif
9610         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9611         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9612                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9613                         /* No, not sent to this net or not ready for rtx */
9614                         continue;
9615                 }
9616                 if (chk->data == NULL) {
9617                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9618                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9619                         continue;
9620                 }
9621                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9622                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9623                         struct mbuf *op_err;
9624                         char msg[SCTP_DIAG_INFO_LEN];
9625
9626                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9627                             chk->rec.data.TSN_seq, chk->snd_count);
9628                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9629                             msg);
9630                         atomic_add_int(&stcb->asoc.refcnt, 1);
9631                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9632                             so_locked);
9633                         SCTP_TCB_LOCK(stcb);
9634                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9635                         return (SCTP_RETRAN_EXIT);
9636                 }
9637                 /* pick up the net */
9638                 net = chk->whoTo;
9639                 switch (net->ro._l_addr.sa.sa_family) {
9640 #ifdef INET
9641                 case AF_INET:
9642                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9643                         break;
9644 #endif
9645 #ifdef INET6
9646                 case AF_INET6:
9647                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9648                         break;
9649 #endif
9650                 default:
9651                         /* TSNH */
9652                         mtu = net->mtu;
9653                         break;
9654                 }
9655
9656                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9657                         /* No room in peers rwnd */
9658                         uint32_t tsn;
9659
9660                         tsn = asoc->last_acked_seq + 1;
9661                         if (tsn == chk->rec.data.TSN_seq) {
9662                                 /*
9663                                  * we make a special exception for this
9664                                  * case. The peer has no rwnd but is missing
9665                                  * the lowest chunk.. which is probably what
9666                                  * is holding up the rwnd.
9667                                  */
9668                                 goto one_chunk_around;
9669                         }
9670                         return (1);
9671                 }
9672 one_chunk_around:
9673                 if (asoc->peers_rwnd < mtu) {
9674                         one_chunk = 1;
9675                         if ((asoc->peers_rwnd == 0) &&
9676                             (asoc->total_flight == 0)) {
9677                                 chk->window_probe = 1;
9678                                 chk->whoTo->window_probe = 1;
9679                         }
9680                 }
9681 #ifdef SCTP_AUDITING_ENABLED
9682                 sctp_audit_log(0xC3, 2);
9683 #endif
9684                 bundle_at = 0;
9685                 m = NULL;
9686                 net->fast_retran_ip = 0;
9687                 if (chk->rec.data.doing_fast_retransmit == 0) {
9688                         /*
9689                          * if no FR in progress skip destination that have
9690                          * flight_size > cwnd.
9691                          */
9692                         if (net->flight_size >= net->cwnd) {
9693                                 continue;
9694                         }
9695                 } else {
9696                         /*
9697                          * Mark the destination net to have FR recovery
9698                          * limits put on it.
9699                          */
9700                         *fr_done = 1;
9701                         net->fast_retran_ip = 1;
9702                 }
9703
9704                 /*
9705                  * if no AUTH is yet included and this chunk requires it,
9706                  * make sure to account for it.  We don't apply the size
9707                  * until the AUTH chunk is actually added below in case
9708                  * there is no room for this chunk.
9709                  */
9710                 if (data_auth_reqd && (auth == NULL)) {
9711                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9712                 } else
9713                         dmtu = 0;
9714
9715                 if ((chk->send_size <= (mtu - dmtu)) ||
9716                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9717                         /* ok we will add this one */
9718                         if (data_auth_reqd) {
9719                                 if (auth == NULL) {
9720                                         m = sctp_add_auth_chunk(m,
9721                                             &endofchain,
9722                                             &auth,
9723                                             &auth_offset,
9724                                             stcb,
9725                                             SCTP_DATA);
9726                                         auth_keyid = chk->auth_keyid;
9727                                         override_ok = 0;
9728                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9729                                 } else if (override_ok) {
9730                                         auth_keyid = chk->auth_keyid;
9731                                         override_ok = 0;
9732                                 } else if (chk->auth_keyid != auth_keyid) {
9733                                         /* different keyid, so done bundling */
9734                                         break;
9735                                 }
9736                         }
9737                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9738                         if (m == NULL) {
9739                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9740                                 return (ENOMEM);
9741                         }
9742                         /* Do clear IP_DF ? */
9743                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9744                                 no_fragmentflg = 0;
9745                         }
9746                         /* upate our MTU size */
9747                         if (mtu > (chk->send_size + dmtu))
9748                                 mtu -= (chk->send_size + dmtu);
9749                         else
9750                                 mtu = 0;
9751                         data_list[bundle_at++] = chk;
9752                         if (one_chunk && (asoc->total_flight <= 0)) {
9753                                 SCTP_STAT_INCR(sctps_windowprobed);
9754                         }
9755                 }
9756                 if (one_chunk == 0) {
9757                         /*
9758                          * now are there anymore forward from chk to pick
9759                          * up?
9760                          */
9761                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9762                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9763                                         /* Nope, not for retran */
9764                                         continue;
9765                                 }
9766                                 if (fwd->whoTo != net) {
9767                                         /* Nope, not the net in question */
9768                                         continue;
9769                                 }
9770                                 if (data_auth_reqd && (auth == NULL)) {
9771                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9772                                 } else
9773                                         dmtu = 0;
9774                                 if (fwd->send_size <= (mtu - dmtu)) {
9775                                         if (data_auth_reqd) {
9776                                                 if (auth == NULL) {
9777                                                         m = sctp_add_auth_chunk(m,
9778                                                             &endofchain,
9779                                                             &auth,
9780                                                             &auth_offset,
9781                                                             stcb,
9782                                                             SCTP_DATA);
9783                                                         auth_keyid = fwd->auth_keyid;
9784                                                         override_ok = 0;
9785                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9786                                                 } else if (override_ok) {
9787                                                         auth_keyid = fwd->auth_keyid;
9788                                                         override_ok = 0;
9789                                                 } else if (fwd->auth_keyid != auth_keyid) {
9790                                                         /*
9791                                                          * different keyid,
9792                                                          * so done bundling
9793                                                          */
9794                                                         break;
9795                                                 }
9796                                         }
9797                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9798                                         if (m == NULL) {
9799                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9800                                                 return (ENOMEM);
9801                                         }
9802                                         /* Do clear IP_DF ? */
9803                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9804                                                 no_fragmentflg = 0;
9805                                         }
9806                                         /* upate our MTU size */
9807                                         if (mtu > (fwd->send_size + dmtu))
9808                                                 mtu -= (fwd->send_size + dmtu);
9809                                         else
9810                                                 mtu = 0;
9811                                         data_list[bundle_at++] = fwd;
9812                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9813                                                 break;
9814                                         }
9815                                 } else {
9816                                         /* can't fit so we are done */
9817                                         break;
9818                                 }
9819                         }
9820                 }
9821                 /* Is there something to send for this destination? */
9822                 if (m) {
9823                         /*
9824                          * No matter if we fail/or succeed we should start a
9825                          * timer. A failure is like a lost IP packet :-)
9826                          */
9827                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9828                                 /*
9829                                  * no timer running on this destination
9830                                  * restart it.
9831                                  */
9832                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9833                                 tmr_started = 1;
9834                         }
9835                         /* Now lets send it, if there is anything to send :> */
9836                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9837                             (struct sockaddr *)&net->ro._l_addr, m,
9838                             auth_offset, auth, auth_keyid,
9839                             no_fragmentflg, 0, 0,
9840                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9841                             net->port, NULL,
9842                             0, 0,
9843                             so_locked))) {
9844                                 /* error, we could not output */
9845                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9846                                 return (error);
9847                         }
9848                         endofchain = NULL;
9849                         auth = NULL;
9850                         auth_offset = 0;
9851                         /* For HB's */
9852                         /*
9853                          * We don't want to mark the net->sent time here
9854                          * since this we use this for HB and retrans cannot
9855                          * measure RTT
9856                          */
9857                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9858
9859                         /* For auto-close */
9860                         cnt_thru++;
9861                         if (*now_filled == 0) {
9862                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9863                                 *now = asoc->time_last_sent;
9864                                 *now_filled = 1;
9865                         } else {
9866                                 asoc->time_last_sent = *now;
9867                         }
9868                         *cnt_out += bundle_at;
9869 #ifdef SCTP_AUDITING_ENABLED
9870                         sctp_audit_log(0xC4, bundle_at);
9871 #endif
9872                         if (bundle_at) {
9873                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9874                         }
9875                         for (i = 0; i < bundle_at; i++) {
9876                                 SCTP_STAT_INCR(sctps_sendretransdata);
9877                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9878                                 /*
9879                                  * When we have a revoked data, and we
9880                                  * retransmit it, then we clear the revoked
9881                                  * flag since this flag dictates if we
9882                                  * subtracted from the fs
9883                                  */
9884                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9885                                         /* Deflate the cwnd */
9886                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9887                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9888                                 }
9889                                 data_list[i]->snd_count++;
9890                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9891                                 /* record the time */
9892                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9893                                 if (data_list[i]->book_size_scale) {
9894                                         /*
9895                                          * need to double the book size on
9896                                          * this one
9897                                          */
9898                                         data_list[i]->book_size_scale = 0;
9899                                         /*
9900                                          * Since we double the booksize, we
9901                                          * must also double the output queue
9902                                          * size, since this get shrunk when
9903                                          * we free by this amount.
9904                                          */
9905                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9906                                         data_list[i]->book_size *= 2;
9907
9908
9909                                 } else {
9910                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9911                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9912                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9913                                         }
9914                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9915                                             (uint32_t) (data_list[i]->send_size +
9916                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9917                                 }
9918                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9919                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9920                                             data_list[i]->whoTo->flight_size,
9921                                             data_list[i]->book_size,
9922                                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
9923                                             data_list[i]->rec.data.TSN_seq);
9924                                 }
9925                                 sctp_flight_size_increase(data_list[i]);
9926                                 sctp_total_flight_increase(stcb, data_list[i]);
9927                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9928                                         /* SWS sender side engages */
9929                                         asoc->peers_rwnd = 0;
9930                                 }
9931                                 if ((i == 0) &&
9932                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9933                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9934                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9935                                             (tmr_started == 0)) {
9936                                                 /*-
9937                                                  * ok we just fast-retrans'd
9938                                                  * the lowest TSN, i.e the
9939                                                  * first on the list. In
9940                                                  * this case we want to give
9941                                                  * some more time to get a
9942                                                  * SACK back without a
9943                                                  * t3-expiring.
9944                                                  */
9945                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9946                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9947                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9948                                         }
9949                                 }
9950                         }
9951                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9952                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9953                         }
9954 #ifdef SCTP_AUDITING_ENABLED
9955                         sctp_auditing(21, inp, stcb, NULL);
9956 #endif
9957                 } else {
9958                         /* None will fit */
9959                         return (1);
9960                 }
9961                 if (asoc->sent_queue_retran_cnt <= 0) {
9962                         /* all done we have no more to retran */
9963                         asoc->sent_queue_retran_cnt = 0;
9964                         break;
9965                 }
9966                 if (one_chunk) {
9967                         /* No more room in rwnd */
9968                         return (1);
9969                 }
9970                 /* stop the for loop here. we sent out a packet */
9971                 break;
9972         }
9973         return (0);
9974 }
9975
9976 static void
9977 sctp_timer_validation(struct sctp_inpcb *inp,
9978     struct sctp_tcb *stcb,
9979     struct sctp_association *asoc)
9980 {
9981         struct sctp_nets *net;
9982
9983         /* Validate that a timer is running somewhere */
9984         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9985                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9986                         /* Here is a timer */
9987                         return;
9988                 }
9989         }
9990         SCTP_TCB_LOCK_ASSERT(stcb);
9991         /* Gak, we did not have a timer somewhere */
9992         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9993         if (asoc->alternate) {
9994                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9995         } else {
9996                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9997         }
9998         return;
9999 }
10000
10001 void
10002 sctp_chunk_output(struct sctp_inpcb *inp,
10003     struct sctp_tcb *stcb,
10004     int from_where,
10005     int so_locked
10006 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10007     SCTP_UNUSED
10008 #endif
10009 )
10010 {
10011         /*-
10012          * Ok this is the generic chunk service queue. we must do the
10013          * following:
10014          * - See if there are retransmits pending, if so we must
10015          *   do these first.
10016          * - Service the stream queue that is next, moving any
10017          *   message (note I must get a complete message i.e.
10018          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10019          *   TSN's
10020          * - Check to see if the cwnd/rwnd allows any output, if so we
10021          *   go ahead and fomulate and send the low level chunks. Making sure
10022          *   to combine any control in the control chunk queue also.
10023          */
10024         struct sctp_association *asoc;
10025         struct sctp_nets *net;
10026         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10027         unsigned int burst_cnt = 0;
10028         struct timeval now;
10029         int now_filled = 0;
10030         int nagle_on;
10031         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10032         int un_sent = 0;
10033         int fr_done;
10034         unsigned int tot_frs = 0;
10035
10036         asoc = &stcb->asoc;
10037 do_it_again:
10038         /* The Nagle algorithm is only applied when handling a send call. */
10039         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10040                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10041                         nagle_on = 0;
10042                 } else {
10043                         nagle_on = 1;
10044                 }
10045         } else {
10046                 nagle_on = 0;
10047         }
10048         SCTP_TCB_LOCK_ASSERT(stcb);
10049
10050         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10051
10052         if ((un_sent <= 0) &&
10053             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10054             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10055             (asoc->sent_queue_retran_cnt == 0) &&
10056             (asoc->trigger_reset == 0)) {
10057                 /* Nothing to do unless there is something to be sent left */
10058                 return;
10059         }
10060         /*
10061          * Do we have something to send, data or control AND a sack timer
10062          * running, if so piggy-back the sack.
10063          */
10064         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10065                 sctp_send_sack(stcb, so_locked);
10066                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10067         }
10068         while (asoc->sent_queue_retran_cnt) {
10069                 /*-
10070                  * Ok, it is retransmission time only, we send out only ONE
10071                  * packet with a single call off to the retran code.
10072                  */
10073                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10074                         /*-
10075                          * Special hook for handling cookiess discarded
10076                          * by peer that carried data. Send cookie-ack only
10077                          * and then the next call with get the retran's.
10078                          */
10079                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10080                             from_where,
10081                             &now, &now_filled, frag_point, so_locked);
10082                         return;
10083                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10084                         /* if its not from a HB then do it */
10085                         fr_done = 0;
10086                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10087                         if (fr_done) {
10088                                 tot_frs++;
10089                         }
10090                 } else {
10091                         /*
10092                          * its from any other place, we don't allow retran
10093                          * output (only control)
10094                          */
10095                         ret = 1;
10096                 }
10097                 if (ret > 0) {
10098                         /* Can't send anymore */
10099                         /*-
10100                          * now lets push out control by calling med-level
10101                          * output once. this assures that we WILL send HB's
10102                          * if queued too.
10103                          */
10104                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10105                             from_where,
10106                             &now, &now_filled, frag_point, so_locked);
10107 #ifdef SCTP_AUDITING_ENABLED
10108                         sctp_auditing(8, inp, stcb, NULL);
10109 #endif
10110                         sctp_timer_validation(inp, stcb, asoc);
10111                         return;
10112                 }
10113                 if (ret < 0) {
10114                         /*-
10115                          * The count was off.. retran is not happening so do
10116                          * the normal retransmission.
10117                          */
10118 #ifdef SCTP_AUDITING_ENABLED
10119                         sctp_auditing(9, inp, stcb, NULL);
10120 #endif
10121                         if (ret == SCTP_RETRAN_EXIT) {
10122                                 return;
10123                         }
10124                         break;
10125                 }
10126                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10127                         /* Only one transmission allowed out of a timeout */
10128 #ifdef SCTP_AUDITING_ENABLED
10129                         sctp_auditing(10, inp, stcb, NULL);
10130 #endif
10131                         /* Push out any control */
10132                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10133                             &now, &now_filled, frag_point, so_locked);
10134                         return;
10135                 }
10136                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10137                         /* Hit FR burst limit */
10138                         return;
10139                 }
10140                 if ((num_out == 0) && (ret == 0)) {
10141                         /* No more retrans to send */
10142                         break;
10143                 }
10144         }
10145 #ifdef SCTP_AUDITING_ENABLED
10146         sctp_auditing(12, inp, stcb, NULL);
10147 #endif
10148         /* Check for bad destinations, if they exist move chunks around. */
10149         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10150                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10151                         /*-
10152                          * if possible move things off of this address we
10153                          * still may send below due to the dormant state but
10154                          * we try to find an alternate address to send to
10155                          * and if we have one we move all queued data on the
10156                          * out wheel to this alternate address.
10157                          */
10158                         if (net->ref_count > 1)
10159                                 sctp_move_chunks_from_net(stcb, net);
10160                 } else {
10161                         /*-
10162                          * if ((asoc->sat_network) || (net->addr_is_local))
10163                          * { burst_limit = asoc->max_burst *
10164                          * SCTP_SAT_NETWORK_BURST_INCR; }
10165                          */
10166                         if (asoc->max_burst > 0) {
10167                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10168                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10169                                                 /*
10170                                                  * JRS - Use the congestion
10171                                                  * control given in the
10172                                                  * congestion control module
10173                                                  */
10174                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10175                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10176                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10177                                                 }
10178                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10179                                         }
10180                                         net->fast_retran_ip = 0;
10181                                 } else {
10182                                         if (net->flight_size == 0) {
10183                                                 /*
10184                                                  * Should be decaying the
10185                                                  * cwnd here
10186                                                  */
10187                                                 ;
10188                                         }
10189                                 }
10190                         }
10191                 }
10192
10193         }
10194         burst_cnt = 0;
10195         do {
10196                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10197                     &reason_code, 0, from_where,
10198                     &now, &now_filled, frag_point, so_locked);
10199                 if (error) {
10200                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10201                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10202                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10203                         }
10204                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10205                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10206                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10207                         }
10208                         break;
10209                 }
10210                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10211
10212                 tot_out += num_out;
10213                 burst_cnt++;
10214                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10215                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10216                         if (num_out == 0) {
10217                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10218                         }
10219                 }
10220                 if (nagle_on) {
10221                         /*
10222                          * When the Nagle algorithm is used, look at how
10223                          * much is unsent, then if its smaller than an MTU
10224                          * and we have data in flight we stop, except if we
10225                          * are handling a fragmented user message.
10226                          */
10227                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10228                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10229                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10230                             (stcb->asoc.total_flight > 0) &&
10231                             ((stcb->asoc.locked_on_sending == NULL) ||
10232                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10233                                 break;
10234                         }
10235                 }
10236                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10237                     TAILQ_EMPTY(&asoc->send_queue) &&
10238                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10239                         /* Nothing left to send */
10240                         break;
10241                 }
10242                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10243                         /* Nothing left to send */
10244                         break;
10245                 }
10246         } while (num_out &&
10247             ((asoc->max_burst == 0) ||
10248             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10249             (burst_cnt < asoc->max_burst)));
10250
10251         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10252                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10253                         SCTP_STAT_INCR(sctps_maxburstqueued);
10254                         asoc->burst_limit_applied = 1;
10255                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10256                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10257                         }
10258                 } else {
10259                         asoc->burst_limit_applied = 0;
10260                 }
10261         }
10262         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10263                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10264         }
10265         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10266             tot_out);
10267
10268         /*-
10269          * Now we need to clean up the control chunk chain if a ECNE is on
10270          * it. It must be marked as UNSENT again so next call will continue
10271          * to send it until such time that we get a CWR, to remove it.
10272          */
10273         if (stcb->asoc.ecn_echo_cnt_onq)
10274                 sctp_fix_ecn_echo(asoc);
10275
10276         if (stcb->asoc.trigger_reset) {
10277                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10278                         goto do_it_again;
10279                 }
10280         }
10281         return;
10282 }
10283
10284
10285 int
10286 sctp_output(
10287     struct sctp_inpcb *inp,
10288     struct mbuf *m,
10289     struct sockaddr *addr,
10290     struct mbuf *control,
10291     struct thread *p,
10292     int flags)
10293 {
10294         if (inp == NULL) {
10295                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10296                 return (EINVAL);
10297         }
10298         if (inp->sctp_socket == NULL) {
10299                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10300                 return (EINVAL);
10301         }
10302         return (sctp_sosend(inp->sctp_socket,
10303             addr,
10304             (struct uio *)NULL,
10305             m,
10306             control,
10307             flags, p
10308             ));
10309 }
10310
10311 void
10312 send_forward_tsn(struct sctp_tcb *stcb,
10313     struct sctp_association *asoc)
10314 {
10315         struct sctp_tmit_chunk *chk;
10316         struct sctp_forward_tsn_chunk *fwdtsn;
10317         uint32_t advance_peer_ack_point;
10318         int old;
10319
10320         if (asoc->idata_supported) {
10321                 old = 0;
10322         } else {
10323                 old = 1;
10324         }
10325         SCTP_TCB_LOCK_ASSERT(stcb);
10326         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10327                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10328                         /* mark it to unsent */
10329                         chk->sent = SCTP_DATAGRAM_UNSENT;
10330                         chk->snd_count = 0;
10331                         /* Do we correct its output location? */
10332                         if (chk->whoTo) {
10333                                 sctp_free_remote_addr(chk->whoTo);
10334                                 chk->whoTo = NULL;
10335                         }
10336                         goto sctp_fill_in_rest;
10337                 }
10338         }
10339         /* Ok if we reach here we must build one */
10340         sctp_alloc_a_chunk(stcb, chk);
10341         if (chk == NULL) {
10342                 return;
10343         }
10344         asoc->fwd_tsn_cnt++;
10345         chk->copy_by_ref = 0;
10346         /*
10347          * We don't do the old thing here since this is used not for on-wire
10348          * but to tell if we are sending a fwd-tsn by the stack during
10349          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10350          */
10351         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10352         chk->rec.chunk_id.can_take_data = 0;
10353         chk->flags = 0;
10354         chk->asoc = asoc;
10355         chk->whoTo = NULL;
10356         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10357         if (chk->data == NULL) {
10358                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10359                 return;
10360         }
10361         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10362         chk->sent = SCTP_DATAGRAM_UNSENT;
10363         chk->snd_count = 0;
10364         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10365         asoc->ctrl_queue_cnt++;
10366 sctp_fill_in_rest:
10367         /*-
10368          * Here we go through and fill out the part that deals with
10369          * stream/seq of the ones we skip.
10370          */
10371         SCTP_BUF_LEN(chk->data) = 0;
10372         {
10373                 struct sctp_tmit_chunk *at, *tp1, *last;
10374                 struct sctp_strseq *strseq;
10375                 struct sctp_strseq_mid *strseq_m;
10376                 unsigned int cnt_of_space, i, ovh;
10377                 unsigned int space_needed;
10378                 unsigned int cnt_of_skipped = 0;
10379
10380                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10381                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10382                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10383                                 /* no more to look at */
10384                                 break;
10385                         }
10386                         if ((at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) && old) {
10387                                 /* We don't report these */
10388                                 continue;
10389                         }
10390                         cnt_of_skipped++;
10391                 }
10392                 if (old) {
10393                         space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10394                             (cnt_of_skipped * sizeof(struct sctp_strseq)));
10395                 } else {
10396                         space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10397                             (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10398                 }
10399                 cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10400
10401                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10402                         ovh = SCTP_MIN_OVERHEAD;
10403                 } else {
10404                         ovh = SCTP_MIN_V4_OVERHEAD;
10405                 }
10406                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10407                         /* trim to a mtu size */
10408                         cnt_of_space = asoc->smallest_mtu - ovh;
10409                 }
10410                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10411                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10412                             0xff, 0, cnt_of_skipped,
10413                             asoc->advanced_peer_ack_point);
10414
10415                 }
10416                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10417                 if (cnt_of_space < space_needed) {
10418                         /*-
10419                          * ok we must trim down the chunk by lowering the
10420                          * advance peer ack point.
10421                          */
10422                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10423                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10424                                     0xff, 0xff, cnt_of_space,
10425                                     space_needed);
10426                         }
10427                         if (old) {
10428                                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10429                                 cnt_of_skipped /= sizeof(struct sctp_strseq);
10430                         } else {
10431                                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10432                                 cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10433                         }
10434                         /*-
10435                          * Go through and find the TSN that will be the one
10436                          * we report.
10437                          */
10438                         at = TAILQ_FIRST(&asoc->sent_queue);
10439                         if (at != NULL) {
10440                                 for (i = 0; i < cnt_of_skipped; i++) {
10441                                         tp1 = TAILQ_NEXT(at, sctp_next);
10442                                         if (tp1 == NULL) {
10443                                                 break;
10444                                         }
10445                                         at = tp1;
10446                                 }
10447                         }
10448                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10449                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10450                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10451                                     asoc->advanced_peer_ack_point);
10452                         }
10453                         last = at;
10454                         /*-
10455                          * last now points to last one I can report, update
10456                          * peer ack point
10457                          */
10458                         if (last)
10459                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10460                         if (old) {
10461                                 space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10462                                     cnt_of_skipped * sizeof(struct sctp_strseq);
10463                         } else {
10464                                 space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10465                                     cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10466                         }
10467                 }
10468                 chk->send_size = space_needed;
10469                 /* Setup the chunk */
10470                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10471                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10472                 fwdtsn->ch.chunk_flags = 0;
10473                 if (old) {
10474                         fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10475                 } else {
10476                         fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10477                 }
10478                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10479                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10480                 fwdtsn++;
10481                 /*-
10482                  * Move pointer to after the fwdtsn and transfer to the
10483                  * strseq pointer.
10484                  */
10485                 if (old) {
10486                         strseq = (struct sctp_strseq *)fwdtsn;
10487                 } else {
10488                         strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10489                 }
10490                 /*-
10491                  * Now populate the strseq list. This is done blindly
10492                  * without pulling out duplicate stream info. This is
10493                  * inefficent but won't harm the process since the peer will
10494                  * look at these in sequence and will thus release anything.
10495                  * It could mean we exceed the PMTU and chop off some that
10496                  * we could have included.. but this is unlikely (aka 1432/4
10497                  * would mean 300+ stream seq's would have to be reported in
10498                  * one FWD-TSN. With a bit of work we can later FIX this to
10499                  * optimize and pull out duplcates.. but it does add more
10500                  * overhead. So for now... not!
10501                  */
10502                 at = TAILQ_FIRST(&asoc->sent_queue);
10503                 for (i = 0; i < cnt_of_skipped; i++) {
10504                         tp1 = TAILQ_NEXT(at, sctp_next);
10505                         if (tp1 == NULL)
10506                                 break;
10507                         if (old && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10508                                 /* We don't report these */
10509                                 i--;
10510                                 at = tp1;
10511                                 continue;
10512                         }
10513                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10514                                 at->rec.data.fwd_tsn_cnt = 0;
10515                         }
10516                         if (old) {
10517                                 strseq->stream = ntohs(at->rec.data.stream_number);
10518                                 strseq->sequence = ntohs(at->rec.data.stream_seq);
10519                                 strseq++;
10520                         } else {
10521                                 strseq_m->stream = ntohs(at->rec.data.stream_number);
10522                                 strseq_m->msg_id = ntohl(at->rec.data.stream_seq);
10523                                 if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)
10524                                         strseq_m->flags = ntohs(PR_SCTP_UNORDERED_FLAG);
10525                                 else
10526                                         strseq_m->flags = 0;
10527                                 strseq_m++;
10528                         }
10529                         at = tp1;
10530                 }
10531         }
10532         return;
10533 }
10534
10535 void
10536 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10537 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10538     SCTP_UNUSED
10539 #endif
10540 )
10541 {
10542         /*-
10543          * Queue up a SACK or NR-SACK in the control queue.
10544          * We must first check to see if a SACK or NR-SACK is
10545          * somehow on the control queue.
10546          * If so, we will take and and remove the old one.
10547          */
10548         struct sctp_association *asoc;
10549         struct sctp_tmit_chunk *chk, *a_chk;
10550         struct sctp_sack_chunk *sack;
10551         struct sctp_nr_sack_chunk *nr_sack;
10552         struct sctp_gap_ack_block *gap_descriptor;
10553         const struct sack_track *selector;
10554         int mergeable = 0;
10555         int offset;
10556         caddr_t limit;
10557         uint32_t *dup;
10558         int limit_reached = 0;
10559         unsigned int i, siz, j;
10560         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10561         int num_dups = 0;
10562         int space_req;
10563         uint32_t highest_tsn;
10564         uint8_t flags;
10565         uint8_t type;
10566         uint8_t tsn_map;
10567
10568         if (stcb->asoc.nrsack_supported == 1) {
10569                 type = SCTP_NR_SELECTIVE_ACK;
10570         } else {
10571                 type = SCTP_SELECTIVE_ACK;
10572         }
10573         a_chk = NULL;
10574         asoc = &stcb->asoc;
10575         SCTP_TCB_LOCK_ASSERT(stcb);
10576         if (asoc->last_data_chunk_from == NULL) {
10577                 /* Hmm we never received anything */
10578                 return;
10579         }
10580         sctp_slide_mapping_arrays(stcb);
10581         sctp_set_rwnd(stcb, asoc);
10582         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10583                 if (chk->rec.chunk_id.id == type) {
10584                         /* Hmm, found a sack already on queue, remove it */
10585                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10586                         asoc->ctrl_queue_cnt--;
10587                         a_chk = chk;
10588                         if (a_chk->data) {
10589                                 sctp_m_freem(a_chk->data);
10590                                 a_chk->data = NULL;
10591                         }
10592                         if (a_chk->whoTo) {
10593                                 sctp_free_remote_addr(a_chk->whoTo);
10594                                 a_chk->whoTo = NULL;
10595                         }
10596                         break;
10597                 }
10598         }
10599         if (a_chk == NULL) {
10600                 sctp_alloc_a_chunk(stcb, a_chk);
10601                 if (a_chk == NULL) {
10602                         /* No memory so we drop the idea, and set a timer */
10603                         if (stcb->asoc.delayed_ack) {
10604                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10605                                     stcb->sctp_ep, stcb, NULL,
10606                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10607                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10608                                     stcb->sctp_ep, stcb, NULL);
10609                         } else {
10610                                 stcb->asoc.send_sack = 1;
10611                         }
10612                         return;
10613                 }
10614                 a_chk->copy_by_ref = 0;
10615                 a_chk->rec.chunk_id.id = type;
10616                 a_chk->rec.chunk_id.can_take_data = 1;
10617         }
10618         /* Clear our pkt counts */
10619         asoc->data_pkts_seen = 0;
10620
10621         a_chk->flags = 0;
10622         a_chk->asoc = asoc;
10623         a_chk->snd_count = 0;
10624         a_chk->send_size = 0;   /* fill in later */
10625         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10626         a_chk->whoTo = NULL;
10627
10628         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10629                 /*-
10630                  * Ok, the destination for the SACK is unreachable, lets see if
10631                  * we can select an alternate to asoc->last_data_chunk_from
10632                  */
10633                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10634                 if (a_chk->whoTo == NULL) {
10635                         /* Nope, no alternate */
10636                         a_chk->whoTo = asoc->last_data_chunk_from;
10637                 }
10638         } else {
10639                 a_chk->whoTo = asoc->last_data_chunk_from;
10640         }
10641         if (a_chk->whoTo) {
10642                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10643         }
10644         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10645                 highest_tsn = asoc->highest_tsn_inside_map;
10646         } else {
10647                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10648         }
10649         if (highest_tsn == asoc->cumulative_tsn) {
10650                 /* no gaps */
10651                 if (type == SCTP_SELECTIVE_ACK) {
10652                         space_req = sizeof(struct sctp_sack_chunk);
10653                 } else {
10654                         space_req = sizeof(struct sctp_nr_sack_chunk);
10655                 }
10656         } else {
10657                 /* gaps get a cluster */
10658                 space_req = MCLBYTES;
10659         }
10660         /* Ok now lets formulate a MBUF with our sack */
10661         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10662         if ((a_chk->data == NULL) ||
10663             (a_chk->whoTo == NULL)) {
10664                 /* rats, no mbuf memory */
10665                 if (a_chk->data) {
10666                         /* was a problem with the destination */
10667                         sctp_m_freem(a_chk->data);
10668                         a_chk->data = NULL;
10669                 }
10670                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10671                 /* sa_ignore NO_NULL_CHK */
10672                 if (stcb->asoc.delayed_ack) {
10673                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10674                             stcb->sctp_ep, stcb, NULL,
10675                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10676                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10677                             stcb->sctp_ep, stcb, NULL);
10678                 } else {
10679                         stcb->asoc.send_sack = 1;
10680                 }
10681                 return;
10682         }
10683         /* ok, lets go through and fill it in */
10684         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10685         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10686         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10687                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10688         }
10689         limit = mtod(a_chk->data, caddr_t);
10690         limit += space;
10691
10692         flags = 0;
10693
10694         if ((asoc->sctp_cmt_on_off > 0) &&
10695             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10696                 /*-
10697                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10698                  * received, then set high bit to 1, else 0. Reset
10699                  * pkts_rcvd.
10700                  */
10701                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10702                 asoc->cmt_dac_pkts_rcvd = 0;
10703         }
10704 #ifdef SCTP_ASOCLOG_OF_TSNS
10705         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10706         stcb->asoc.cumack_log_atsnt++;
10707         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10708                 stcb->asoc.cumack_log_atsnt = 0;
10709         }
10710 #endif
10711         /* reset the readers interpretation */
10712         stcb->freed_by_sorcv_sincelast = 0;
10713
10714         if (type == SCTP_SELECTIVE_ACK) {
10715                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10716                 nr_sack = NULL;
10717                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10718                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10719                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10720                 } else {
10721                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10722                 }
10723         } else {
10724                 sack = NULL;
10725                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10726                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10727                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10728                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10729                 } else {
10730                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10731                 }
10732         }
10733
10734         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10735                 offset = 1;
10736         } else {
10737                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10738         }
10739         if (((type == SCTP_SELECTIVE_ACK) &&
10740             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10741             ((type == SCTP_NR_SELECTIVE_ACK) &&
10742             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10743                 /* we have a gap .. maybe */
10744                 for (i = 0; i < siz; i++) {
10745                         tsn_map = asoc->mapping_array[i];
10746                         if (type == SCTP_SELECTIVE_ACK) {
10747                                 tsn_map |= asoc->nr_mapping_array[i];
10748                         }
10749                         if (i == 0) {
10750                                 /*
10751                                  * Clear all bits corresponding to TSNs
10752                                  * smaller or equal to the cumulative TSN.
10753                                  */
10754                                 tsn_map &= (~0U << (1 - offset));
10755                         }
10756                         selector = &sack_array[tsn_map];
10757                         if (mergeable && selector->right_edge) {
10758                                 /*
10759                                  * Backup, left and right edges were ok to
10760                                  * merge.
10761                                  */
10762                                 num_gap_blocks--;
10763                                 gap_descriptor--;
10764                         }
10765                         if (selector->num_entries == 0)
10766                                 mergeable = 0;
10767                         else {
10768                                 for (j = 0; j < selector->num_entries; j++) {
10769                                         if (mergeable && selector->right_edge) {
10770                                                 /*
10771                                                  * do a merge by NOT setting
10772                                                  * the left side
10773                                                  */
10774                                                 mergeable = 0;
10775                                         } else {
10776                                                 /*
10777                                                  * no merge, set the left
10778                                                  * side
10779                                                  */
10780                                                 mergeable = 0;
10781                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10782                                         }
10783                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10784                                         num_gap_blocks++;
10785                                         gap_descriptor++;
10786                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10787                                                 /* no more room */
10788                                                 limit_reached = 1;
10789                                                 break;
10790                                         }
10791                                 }
10792                                 if (selector->left_edge) {
10793                                         mergeable = 1;
10794                                 }
10795                         }
10796                         if (limit_reached) {
10797                                 /* Reached the limit stop */
10798                                 break;
10799                         }
10800                         offset += 8;
10801                 }
10802         }
10803         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10804             (limit_reached == 0)) {
10805
10806                 mergeable = 0;
10807
10808                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10809                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10810                 } else {
10811                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10812                 }
10813
10814                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10815                         offset = 1;
10816                 } else {
10817                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10818                 }
10819                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10820                         /* we have a gap .. maybe */
10821                         for (i = 0; i < siz; i++) {
10822                                 tsn_map = asoc->nr_mapping_array[i];
10823                                 if (i == 0) {
10824                                         /*
10825                                          * Clear all bits corresponding to
10826                                          * TSNs smaller or equal to the
10827                                          * cumulative TSN.
10828                                          */
10829                                         tsn_map &= (~0U << (1 - offset));
10830                                 }
10831                                 selector = &sack_array[tsn_map];
10832                                 if (mergeable && selector->right_edge) {
10833                                         /*
10834                                          * Backup, left and right edges were
10835                                          * ok to merge.
10836                                          */
10837                                         num_nr_gap_blocks--;
10838                                         gap_descriptor--;
10839                                 }
10840                                 if (selector->num_entries == 0)
10841                                         mergeable = 0;
10842                                 else {
10843                                         for (j = 0; j < selector->num_entries; j++) {
10844                                                 if (mergeable && selector->right_edge) {
10845                                                         /*
10846                                                          * do a merge by NOT
10847                                                          * setting the left
10848                                                          * side
10849                                                          */
10850                                                         mergeable = 0;
10851                                                 } else {
10852                                                         /*
10853                                                          * no merge, set the
10854                                                          * left side
10855                                                          */
10856                                                         mergeable = 0;
10857                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10858                                                 }
10859                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10860                                                 num_nr_gap_blocks++;
10861                                                 gap_descriptor++;
10862                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10863                                                         /* no more room */
10864                                                         limit_reached = 1;
10865                                                         break;
10866                                                 }
10867                                         }
10868                                         if (selector->left_edge) {
10869                                                 mergeable = 1;
10870                                         }
10871                                 }
10872                                 if (limit_reached) {
10873                                         /* Reached the limit stop */
10874                                         break;
10875                                 }
10876                                 offset += 8;
10877                         }
10878                 }
10879         }
10880         /* now we must add any dups we are going to report. */
10881         if ((limit_reached == 0) && (asoc->numduptsns)) {
10882                 dup = (uint32_t *) gap_descriptor;
10883                 for (i = 0; i < asoc->numduptsns; i++) {
10884                         *dup = htonl(asoc->dup_tsns[i]);
10885                         dup++;
10886                         num_dups++;
10887                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10888                                 /* no more room */
10889                                 break;
10890                         }
10891                 }
10892                 asoc->numduptsns = 0;
10893         }
10894         /*
10895          * now that the chunk is prepared queue it to the control chunk
10896          * queue.
10897          */
10898         if (type == SCTP_SELECTIVE_ACK) {
10899                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_sack_chunk) +
10900                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10901                     num_dups * sizeof(int32_t));
10902                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10903                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10904                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10905                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10906                 sack->sack.num_dup_tsns = htons(num_dups);
10907                 sack->ch.chunk_type = type;
10908                 sack->ch.chunk_flags = flags;
10909                 sack->ch.chunk_length = htons(a_chk->send_size);
10910         } else {
10911                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_nr_sack_chunk) +
10912                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10913                     num_dups * sizeof(int32_t));
10914                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10915                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10916                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10917                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10918                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10919                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10920                 nr_sack->nr_sack.reserved = 0;
10921                 nr_sack->ch.chunk_type = type;
10922                 nr_sack->ch.chunk_flags = flags;
10923                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10924         }
10925         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10926         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10927         asoc->ctrl_queue_cnt++;
10928         asoc->send_sack = 0;
10929         SCTP_STAT_INCR(sctps_sendsacks);
10930         return;
10931 }
10932
10933 void
10934 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10935 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10936     SCTP_UNUSED
10937 #endif
10938 )
10939 {
10940         struct mbuf *m_abort, *m, *m_last;
10941         struct mbuf *m_out, *m_end = NULL;
10942         struct sctp_abort_chunk *abort;
10943         struct sctp_auth_chunk *auth = NULL;
10944         struct sctp_nets *net;
10945         uint32_t vtag;
10946         uint32_t auth_offset = 0;
10947         uint16_t cause_len, chunk_len, padding_len;
10948
10949         SCTP_TCB_LOCK_ASSERT(stcb);
10950         /*-
10951          * Add an AUTH chunk, if chunk requires it and save the offset into
10952          * the chain for AUTH
10953          */
10954         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10955             stcb->asoc.peer_auth_chunks)) {
10956                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10957                     stcb, SCTP_ABORT_ASSOCIATION);
10958                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10959         } else {
10960                 m_out = NULL;
10961         }
10962         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10963         if (m_abort == NULL) {
10964                 if (m_out) {
10965                         sctp_m_freem(m_out);
10966                 }
10967                 if (operr) {
10968                         sctp_m_freem(operr);
10969                 }
10970                 return;
10971         }
10972         /* link in any error */
10973         SCTP_BUF_NEXT(m_abort) = operr;
10974         cause_len = 0;
10975         m_last = NULL;
10976         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10977                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10978                 if (SCTP_BUF_NEXT(m) == NULL) {
10979                         m_last = m;
10980                 }
10981         }
10982         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10983         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10984         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10985         if (m_out == NULL) {
10986                 /* NO Auth chunk prepended, so reserve space in front */
10987                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10988                 m_out = m_abort;
10989         } else {
10990                 /* Put AUTH chunk at the front of the chain */
10991                 SCTP_BUF_NEXT(m_end) = m_abort;
10992         }
10993         if (stcb->asoc.alternate) {
10994                 net = stcb->asoc.alternate;
10995         } else {
10996                 net = stcb->asoc.primary_destination;
10997         }
10998         /* Fill in the ABORT chunk header. */
10999         abort = mtod(m_abort, struct sctp_abort_chunk *);
11000         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11001         if (stcb->asoc.peer_vtag == 0) {
11002                 /* This happens iff the assoc is in COOKIE-WAIT state. */
11003                 vtag = stcb->asoc.my_vtag;
11004                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
11005         } else {
11006                 vtag = stcb->asoc.peer_vtag;
11007                 abort->ch.chunk_flags = 0;
11008         }
11009         abort->ch.chunk_length = htons(chunk_len);
11010         /* Add padding, if necessary. */
11011         if (padding_len > 0) {
11012                 if ((m_last == NULL) ||
11013                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
11014                         sctp_m_freem(m_out);
11015                         return;
11016                 }
11017         }
11018         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11019             (struct sockaddr *)&net->ro._l_addr,
11020             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
11021             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
11022             stcb->asoc.primary_destination->port, NULL,
11023             0, 0,
11024             so_locked);
11025         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11026 }
11027
11028 void
11029 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11030     struct sctp_nets *net,
11031     int reflect_vtag)
11032 {
11033         /* formulate and SEND a SHUTDOWN-COMPLETE */
11034         struct mbuf *m_shutdown_comp;
11035         struct sctp_shutdown_complete_chunk *shutdown_complete;
11036         uint32_t vtag;
11037         uint8_t flags;
11038
11039         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11040         if (m_shutdown_comp == NULL) {
11041                 /* no mbuf's */
11042                 return;
11043         }
11044         if (reflect_vtag) {
11045                 flags = SCTP_HAD_NO_TCB;
11046                 vtag = stcb->asoc.my_vtag;
11047         } else {
11048                 flags = 0;
11049                 vtag = stcb->asoc.peer_vtag;
11050         }
11051         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11052         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11053         shutdown_complete->ch.chunk_flags = flags;
11054         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11055         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11056         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11057             (struct sockaddr *)&net->ro._l_addr,
11058             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11059             stcb->sctp_ep->sctp_lport, stcb->rport,
11060             htonl(vtag),
11061             net->port, NULL,
11062             0, 0,
11063             SCTP_SO_NOT_LOCKED);
11064         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11065         return;
11066 }
11067
11068 static void
11069 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11070     struct sctphdr *sh, uint32_t vtag,
11071     uint8_t type, struct mbuf *cause,
11072     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11073     uint32_t vrf_id, uint16_t port)
11074 {
11075         struct mbuf *o_pak;
11076         struct mbuf *mout;
11077         struct sctphdr *shout;
11078         struct sctp_chunkhdr *ch;
11079
11080 #if defined(INET) || defined(INET6)
11081         struct udphdr *udp;
11082         int ret;
11083
11084 #endif
11085         int len, cause_len, padding_len;
11086
11087 #ifdef INET
11088         struct sockaddr_in *src_sin, *dst_sin;
11089         struct ip *ip;
11090
11091 #endif
11092 #ifdef INET6
11093         struct sockaddr_in6 *src_sin6, *dst_sin6;
11094         struct ip6_hdr *ip6;
11095
11096 #endif
11097
11098         /* Compute the length of the cause and add final padding. */
11099         cause_len = 0;
11100         if (cause != NULL) {
11101                 struct mbuf *m_at, *m_last = NULL;
11102
11103                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11104                         if (SCTP_BUF_NEXT(m_at) == NULL)
11105                                 m_last = m_at;
11106                         cause_len += SCTP_BUF_LEN(m_at);
11107                 }
11108                 padding_len = cause_len % 4;
11109                 if (padding_len != 0) {
11110                         padding_len = 4 - padding_len;
11111                 }
11112                 if (padding_len != 0) {
11113                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11114                                 sctp_m_freem(cause);
11115                                 return;
11116                         }
11117                 }
11118         } else {
11119                 padding_len = 0;
11120         }
11121         /* Get an mbuf for the header. */
11122         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11123         switch (dst->sa_family) {
11124 #ifdef INET
11125         case AF_INET:
11126                 len += sizeof(struct ip);
11127                 break;
11128 #endif
11129 #ifdef INET6
11130         case AF_INET6:
11131                 len += sizeof(struct ip6_hdr);
11132                 break;
11133 #endif
11134         default:
11135                 break;
11136         }
11137 #if defined(INET) || defined(INET6)
11138         if (port) {
11139                 len += sizeof(struct udphdr);
11140         }
11141 #endif
11142         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11143         if (mout == NULL) {
11144                 if (cause) {
11145                         sctp_m_freem(cause);
11146                 }
11147                 return;
11148         }
11149         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11150         SCTP_BUF_LEN(mout) = len;
11151         SCTP_BUF_NEXT(mout) = cause;
11152         M_SETFIB(mout, fibnum);
11153         mout->m_pkthdr.flowid = mflowid;
11154         M_HASHTYPE_SET(mout, mflowtype);
11155 #ifdef INET
11156         ip = NULL;
11157 #endif
11158 #ifdef INET6
11159         ip6 = NULL;
11160 #endif
11161         switch (dst->sa_family) {
11162 #ifdef INET
11163         case AF_INET:
11164                 src_sin = (struct sockaddr_in *)src;
11165                 dst_sin = (struct sockaddr_in *)dst;
11166                 ip = mtod(mout, struct ip *);
11167                 ip->ip_v = IPVERSION;
11168                 ip->ip_hl = (sizeof(struct ip) >> 2);
11169                 ip->ip_tos = 0;
11170                 ip->ip_off = 0;
11171                 ip_fillid(ip);
11172                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11173                 if (port) {
11174                         ip->ip_p = IPPROTO_UDP;
11175                 } else {
11176                         ip->ip_p = IPPROTO_SCTP;
11177                 }
11178                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11179                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11180                 ip->ip_sum = 0;
11181                 len = sizeof(struct ip);
11182                 shout = (struct sctphdr *)((caddr_t)ip + len);
11183                 break;
11184 #endif
11185 #ifdef INET6
11186         case AF_INET6:
11187                 src_sin6 = (struct sockaddr_in6 *)src;
11188                 dst_sin6 = (struct sockaddr_in6 *)dst;
11189                 ip6 = mtod(mout, struct ip6_hdr *);
11190                 ip6->ip6_flow = htonl(0x60000000);
11191                 if (V_ip6_auto_flowlabel) {
11192                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11193                 }
11194                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11195                 if (port) {
11196                         ip6->ip6_nxt = IPPROTO_UDP;
11197                 } else {
11198                         ip6->ip6_nxt = IPPROTO_SCTP;
11199                 }
11200                 ip6->ip6_src = dst_sin6->sin6_addr;
11201                 ip6->ip6_dst = src_sin6->sin6_addr;
11202                 len = sizeof(struct ip6_hdr);
11203                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11204                 break;
11205 #endif
11206         default:
11207                 len = 0;
11208                 shout = mtod(mout, struct sctphdr *);
11209                 break;
11210         }
11211 #if defined(INET) || defined(INET6)
11212         if (port) {
11213                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11214                         sctp_m_freem(mout);
11215                         return;
11216                 }
11217                 udp = (struct udphdr *)shout;
11218                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11219                 udp->uh_dport = port;
11220                 udp->uh_sum = 0;
11221                 udp->uh_ulen = htons((uint16_t) (sizeof(struct udphdr) +
11222                     sizeof(struct sctphdr) +
11223                     sizeof(struct sctp_chunkhdr) +
11224                     cause_len + padding_len));
11225                 len += sizeof(struct udphdr);
11226                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11227         } else {
11228                 udp = NULL;
11229         }
11230 #endif
11231         shout->src_port = sh->dest_port;
11232         shout->dest_port = sh->src_port;
11233         shout->checksum = 0;
11234         if (vtag) {
11235                 shout->v_tag = htonl(vtag);
11236         } else {
11237                 shout->v_tag = sh->v_tag;
11238         }
11239         len += sizeof(struct sctphdr);
11240         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11241         ch->chunk_type = type;
11242         if (vtag) {
11243                 ch->chunk_flags = 0;
11244         } else {
11245                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11246         }
11247         ch->chunk_length = htons((uint16_t) (sizeof(struct sctp_chunkhdr) + cause_len));
11248         len += sizeof(struct sctp_chunkhdr);
11249         len += cause_len + padding_len;
11250
11251         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11252                 sctp_m_freem(mout);
11253                 return;
11254         }
11255         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11256         switch (dst->sa_family) {
11257 #ifdef INET
11258         case AF_INET:
11259                 if (port) {
11260                         if (V_udp_cksum) {
11261                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11262                         } else {
11263                                 udp->uh_sum = 0;
11264                         }
11265                 }
11266                 ip->ip_len = htons(len);
11267                 if (port) {
11268 #if defined(SCTP_WITH_NO_CSUM)
11269                         SCTP_STAT_INCR(sctps_sendnocrc);
11270 #else
11271                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11272                         SCTP_STAT_INCR(sctps_sendswcrc);
11273 #endif
11274                         if (V_udp_cksum) {
11275                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11276                         }
11277                 } else {
11278 #if defined(SCTP_WITH_NO_CSUM)
11279                         SCTP_STAT_INCR(sctps_sendnocrc);
11280 #else
11281                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11282                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11283                         SCTP_STAT_INCR(sctps_sendhwcrc);
11284 #endif
11285                 }
11286 #ifdef SCTP_PACKET_LOGGING
11287                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11288                         sctp_packet_log(o_pak);
11289                 }
11290 #endif
11291                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11292                 break;
11293 #endif
11294 #ifdef INET6
11295         case AF_INET6:
11296                 ip6->ip6_plen = (uint16_t) (len - sizeof(struct ip6_hdr));
11297                 if (port) {
11298 #if defined(SCTP_WITH_NO_CSUM)
11299                         SCTP_STAT_INCR(sctps_sendnocrc);
11300 #else
11301                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11302                         SCTP_STAT_INCR(sctps_sendswcrc);
11303 #endif
11304                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11305                                 udp->uh_sum = 0xffff;
11306                         }
11307                 } else {
11308 #if defined(SCTP_WITH_NO_CSUM)
11309                         SCTP_STAT_INCR(sctps_sendnocrc);
11310 #else
11311                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11312                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11313                         SCTP_STAT_INCR(sctps_sendhwcrc);
11314 #endif
11315                 }
11316 #ifdef SCTP_PACKET_LOGGING
11317                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11318                         sctp_packet_log(o_pak);
11319                 }
11320 #endif
11321                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11322                 break;
11323 #endif
11324         default:
11325                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11326                     dst->sa_family);
11327                 sctp_m_freem(mout);
11328                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11329                 return;
11330         }
11331         SCTP_STAT_INCR(sctps_sendpackets);
11332         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11333         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11334         return;
11335 }
11336
11337 void
11338 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11339     struct sctphdr *sh,
11340     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11341     uint32_t vrf_id, uint16_t port)
11342 {
11343         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11344             mflowtype, mflowid, fibnum,
11345             vrf_id, port);
11346 }
11347
11348 void
11349 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11350 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11351     SCTP_UNUSED
11352 #endif
11353 )
11354 {
11355         struct sctp_tmit_chunk *chk;
11356         struct sctp_heartbeat_chunk *hb;
11357         struct timeval now;
11358
11359         SCTP_TCB_LOCK_ASSERT(stcb);
11360         if (net == NULL) {
11361                 return;
11362         }
11363         (void)SCTP_GETTIME_TIMEVAL(&now);
11364         switch (net->ro._l_addr.sa.sa_family) {
11365 #ifdef INET
11366         case AF_INET:
11367                 break;
11368 #endif
11369 #ifdef INET6
11370         case AF_INET6:
11371                 break;
11372 #endif
11373         default:
11374                 return;
11375         }
11376         sctp_alloc_a_chunk(stcb, chk);
11377         if (chk == NULL) {
11378                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11379                 return;
11380         }
11381         chk->copy_by_ref = 0;
11382         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11383         chk->rec.chunk_id.can_take_data = 1;
11384         chk->flags = 0;
11385         chk->asoc = &stcb->asoc;
11386         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11387
11388         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11389         if (chk->data == NULL) {
11390                 sctp_free_a_chunk(stcb, chk, so_locked);
11391                 return;
11392         }
11393         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11394         SCTP_BUF_LEN(chk->data) = chk->send_size;
11395         chk->sent = SCTP_DATAGRAM_UNSENT;
11396         chk->snd_count = 0;
11397         chk->whoTo = net;
11398         atomic_add_int(&chk->whoTo->ref_count, 1);
11399         /* Now we have a mbuf that we can fill in with the details */
11400         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11401         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11402         /* fill out chunk header */
11403         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11404         hb->ch.chunk_flags = 0;
11405         hb->ch.chunk_length = htons(chk->send_size);
11406         /* Fill out hb parameter */
11407         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11408         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11409         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11410         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11411         /* Did our user request this one, put it in */
11412         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11413         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11414         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11415                 /*
11416                  * we only take from the entropy pool if the address is not
11417                  * confirmed.
11418                  */
11419                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11420                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11421         } else {
11422                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11423                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11424         }
11425         switch (net->ro._l_addr.sa.sa_family) {
11426 #ifdef INET
11427         case AF_INET:
11428                 memcpy(hb->heartbeat.hb_info.address,
11429                     &net->ro._l_addr.sin.sin_addr,
11430                     sizeof(net->ro._l_addr.sin.sin_addr));
11431                 break;
11432 #endif
11433 #ifdef INET6
11434         case AF_INET6:
11435                 memcpy(hb->heartbeat.hb_info.address,
11436                     &net->ro._l_addr.sin6.sin6_addr,
11437                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11438                 break;
11439 #endif
11440         default:
11441                 if (chk->data) {
11442                         sctp_m_freem(chk->data);
11443                         chk->data = NULL;
11444                 }
11445                 sctp_free_a_chunk(stcb, chk, so_locked);
11446                 return;
11447                 break;
11448         }
11449         net->hb_responded = 0;
11450         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11451         stcb->asoc.ctrl_queue_cnt++;
11452         SCTP_STAT_INCR(sctps_sendheartbeat);
11453         return;
11454 }
11455
11456 void
11457 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11458     uint32_t high_tsn)
11459 {
11460         struct sctp_association *asoc;
11461         struct sctp_ecne_chunk *ecne;
11462         struct sctp_tmit_chunk *chk;
11463
11464         if (net == NULL) {
11465                 return;
11466         }
11467         asoc = &stcb->asoc;
11468         SCTP_TCB_LOCK_ASSERT(stcb);
11469         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11470                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11471                         /* found a previous ECN_ECHO update it if needed */
11472                         uint32_t cnt, ctsn;
11473
11474                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11475                         ctsn = ntohl(ecne->tsn);
11476                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11477                                 ecne->tsn = htonl(high_tsn);
11478                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11479                         }
11480                         cnt = ntohl(ecne->num_pkts_since_cwr);
11481                         cnt++;
11482                         ecne->num_pkts_since_cwr = htonl(cnt);
11483                         return;
11484                 }
11485         }
11486         /* nope could not find one to update so we must build one */
11487         sctp_alloc_a_chunk(stcb, chk);
11488         if (chk == NULL) {
11489                 return;
11490         }
11491         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11492         chk->copy_by_ref = 0;
11493         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11494         chk->rec.chunk_id.can_take_data = 0;
11495         chk->flags = 0;
11496         chk->asoc = &stcb->asoc;
11497         chk->send_size = sizeof(struct sctp_ecne_chunk);
11498         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11499         if (chk->data == NULL) {
11500                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11501                 return;
11502         }
11503         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11504         SCTP_BUF_LEN(chk->data) = chk->send_size;
11505         chk->sent = SCTP_DATAGRAM_UNSENT;
11506         chk->snd_count = 0;
11507         chk->whoTo = net;
11508         atomic_add_int(&chk->whoTo->ref_count, 1);
11509
11510         stcb->asoc.ecn_echo_cnt_onq++;
11511         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11512         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11513         ecne->ch.chunk_flags = 0;
11514         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11515         ecne->tsn = htonl(high_tsn);
11516         ecne->num_pkts_since_cwr = htonl(1);
11517         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11518         asoc->ctrl_queue_cnt++;
11519 }
11520
11521 void
11522 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11523     struct mbuf *m, int len, int iphlen, int bad_crc)
11524 {
11525         struct sctp_association *asoc;
11526         struct sctp_pktdrop_chunk *drp;
11527         struct sctp_tmit_chunk *chk;
11528         uint8_t *datap;
11529         int was_trunc = 0;
11530         int fullsz = 0;
11531         long spc;
11532         int offset;
11533         struct sctp_chunkhdr *ch, chunk_buf;
11534         unsigned int chk_length;
11535
11536         if (!stcb) {
11537                 return;
11538         }
11539         asoc = &stcb->asoc;
11540         SCTP_TCB_LOCK_ASSERT(stcb);
11541         if (asoc->pktdrop_supported == 0) {
11542                 /*-
11543                  * peer must declare support before I send one.
11544                  */
11545                 return;
11546         }
11547         if (stcb->sctp_socket == NULL) {
11548                 return;
11549         }
11550         sctp_alloc_a_chunk(stcb, chk);
11551         if (chk == NULL) {
11552                 return;
11553         }
11554         chk->copy_by_ref = 0;
11555         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11556         chk->rec.chunk_id.can_take_data = 1;
11557         chk->flags = 0;
11558         len -= iphlen;
11559         chk->send_size = len;
11560         /* Validate that we do not have an ABORT in here. */
11561         offset = iphlen + sizeof(struct sctphdr);
11562         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11563             sizeof(*ch), (uint8_t *) & chunk_buf);
11564         while (ch != NULL) {
11565                 chk_length = ntohs(ch->chunk_length);
11566                 if (chk_length < sizeof(*ch)) {
11567                         /* break to abort land */
11568                         break;
11569                 }
11570                 switch (ch->chunk_type) {
11571                 case SCTP_PACKET_DROPPED:
11572                 case SCTP_ABORT_ASSOCIATION:
11573                 case SCTP_INITIATION_ACK:
11574                         /**
11575                          * We don't respond with an PKT-DROP to an ABORT
11576                          * or PKT-DROP. We also do not respond to an
11577                          * INIT-ACK, because we can't know if the initiation
11578                          * tag is correct or not.
11579                          */
11580                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11581                         return;
11582                 default:
11583                         break;
11584                 }
11585                 offset += SCTP_SIZE32(chk_length);
11586                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11587                     sizeof(*ch), (uint8_t *) & chunk_buf);
11588         }
11589
11590         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11591             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11592                 /*
11593                  * only send 1 mtu worth, trim off the excess on the end.
11594                  */
11595                 fullsz = len;
11596                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11597                 was_trunc = 1;
11598         }
11599         chk->asoc = &stcb->asoc;
11600         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11601         if (chk->data == NULL) {
11602 jump_out:
11603                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11604                 return;
11605         }
11606         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11607         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11608         if (drp == NULL) {
11609                 sctp_m_freem(chk->data);
11610                 chk->data = NULL;
11611                 goto jump_out;
11612         }
11613         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11614             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11615         chk->book_size_scale = 0;
11616         if (was_trunc) {
11617                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11618                 drp->trunc_len = htons(fullsz);
11619                 /*
11620                  * Len is already adjusted to size minus overhead above take
11621                  * out the pkt_drop chunk itself from it.
11622                  */
11623                 chk->send_size = (uint16_t) (len - sizeof(struct sctp_pktdrop_chunk));
11624                 len = chk->send_size;
11625         } else {
11626                 /* no truncation needed */
11627                 drp->ch.chunk_flags = 0;
11628                 drp->trunc_len = htons(0);
11629         }
11630         if (bad_crc) {
11631                 drp->ch.chunk_flags |= SCTP_BADCRC;
11632         }
11633         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11634         SCTP_BUF_LEN(chk->data) = chk->send_size;
11635         chk->sent = SCTP_DATAGRAM_UNSENT;
11636         chk->snd_count = 0;
11637         if (net) {
11638                 /* we should hit here */
11639                 chk->whoTo = net;
11640                 atomic_add_int(&chk->whoTo->ref_count, 1);
11641         } else {
11642                 chk->whoTo = NULL;
11643         }
11644         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11645         drp->ch.chunk_length = htons(chk->send_size);
11646         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11647         if (spc < 0) {
11648                 spc = 0;
11649         }
11650         drp->bottle_bw = htonl(spc);
11651         if (asoc->my_rwnd) {
11652                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11653                     asoc->size_on_all_streams +
11654                     asoc->my_rwnd_control_len +
11655                     stcb->sctp_socket->so_rcv.sb_cc);
11656         } else {
11657                 /*-
11658                  * If my rwnd is 0, possibly from mbuf depletion as well as
11659                  * space used, tell the peer there is NO space aka onq == bw
11660                  */
11661                 drp->current_onq = htonl(spc);
11662         }
11663         drp->reserved = 0;
11664         datap = drp->data;
11665         m_copydata(m, iphlen, len, (caddr_t)datap);
11666         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11667         asoc->ctrl_queue_cnt++;
11668 }
11669
11670 void
11671 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11672 {
11673         struct sctp_association *asoc;
11674         struct sctp_cwr_chunk *cwr;
11675         struct sctp_tmit_chunk *chk;
11676
11677         SCTP_TCB_LOCK_ASSERT(stcb);
11678         if (net == NULL) {
11679                 return;
11680         }
11681         asoc = &stcb->asoc;
11682         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11683                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11684                         /*
11685                          * found a previous CWR queued to same destination
11686                          * update it if needed
11687                          */
11688                         uint32_t ctsn;
11689
11690                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11691                         ctsn = ntohl(cwr->tsn);
11692                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11693                                 cwr->tsn = htonl(high_tsn);
11694                         }
11695                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11696                                 /* Make sure override is carried */
11697                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11698                         }
11699                         return;
11700                 }
11701         }
11702         sctp_alloc_a_chunk(stcb, chk);
11703         if (chk == NULL) {
11704                 return;
11705         }
11706         chk->copy_by_ref = 0;
11707         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11708         chk->rec.chunk_id.can_take_data = 1;
11709         chk->flags = 0;
11710         chk->asoc = &stcb->asoc;
11711         chk->send_size = sizeof(struct sctp_cwr_chunk);
11712         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11713         if (chk->data == NULL) {
11714                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11715                 return;
11716         }
11717         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11718         SCTP_BUF_LEN(chk->data) = chk->send_size;
11719         chk->sent = SCTP_DATAGRAM_UNSENT;
11720         chk->snd_count = 0;
11721         chk->whoTo = net;
11722         atomic_add_int(&chk->whoTo->ref_count, 1);
11723         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11724         cwr->ch.chunk_type = SCTP_ECN_CWR;
11725         cwr->ch.chunk_flags = override;
11726         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11727         cwr->tsn = htonl(high_tsn);
11728         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11729         asoc->ctrl_queue_cnt++;
11730 }
11731
11732 static int
11733 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11734     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11735 {
11736         uint16_t len, old_len, i;
11737         struct sctp_stream_reset_out_request *req_out;
11738         struct sctp_chunkhdr *ch;
11739         int at;
11740         int number_entries = 0;
11741
11742         ch = mtod(chk->data, struct sctp_chunkhdr *);
11743         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11744         /* get to new offset for the param. */
11745         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11746         /* now how long will this param be? */
11747         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11748                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11749                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11750                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11751                         number_entries++;
11752                 }
11753         }
11754         if (number_entries == 0) {
11755                 return (0);
11756         }
11757         if (number_entries == stcb->asoc.streamoutcnt) {
11758                 number_entries = 0;
11759         }
11760         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11761                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11762         }
11763         len = (uint16_t) (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11764         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11765         req_out->ph.param_length = htons(len);
11766         req_out->request_seq = htonl(seq);
11767         req_out->response_seq = htonl(resp_seq);
11768         req_out->send_reset_at_tsn = htonl(last_sent);
11769         at = 0;
11770         if (number_entries) {
11771                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11772                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11773                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11774                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11775                                 req_out->list_of_streams[at] = htons(i);
11776                                 at++;
11777                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11778                                 if (at >= number_entries) {
11779                                         break;
11780                                 }
11781                         }
11782                 }
11783         } else {
11784                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11785                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11786                 }
11787         }
11788         if (SCTP_SIZE32(len) > len) {
11789                 /*-
11790                  * Need to worry about the pad we may end up adding to the
11791                  * end. This is easy since the struct is either aligned to 4
11792                  * bytes or 2 bytes off.
11793                  */
11794                 req_out->list_of_streams[number_entries] = 0;
11795         }
11796         /* now fix the chunk length */
11797         ch->chunk_length = htons(len + old_len);
11798         chk->book_size = len + old_len;
11799         chk->book_size_scale = 0;
11800         chk->send_size = SCTP_SIZE32(chk->book_size);
11801         SCTP_BUF_LEN(chk->data) = chk->send_size;
11802         return (1);
11803 }
11804
11805 static void
11806 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11807     int number_entries, uint16_t * list,
11808     uint32_t seq)
11809 {
11810         uint16_t len, old_len, i;
11811         struct sctp_stream_reset_in_request *req_in;
11812         struct sctp_chunkhdr *ch;
11813
11814         ch = mtod(chk->data, struct sctp_chunkhdr *);
11815         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11816
11817         /* get to new offset for the param. */
11818         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11819         /* now how long will this param be? */
11820         len = (uint16_t) (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11821         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11822         req_in->ph.param_length = htons(len);
11823         req_in->request_seq = htonl(seq);
11824         if (number_entries) {
11825                 for (i = 0; i < number_entries; i++) {
11826                         req_in->list_of_streams[i] = htons(list[i]);
11827                 }
11828         }
11829         if (SCTP_SIZE32(len) > len) {
11830                 /*-
11831                  * Need to worry about the pad we may end up adding to the
11832                  * end. This is easy since the struct is either aligned to 4
11833                  * bytes or 2 bytes off.
11834                  */
11835                 req_in->list_of_streams[number_entries] = 0;
11836         }
11837         /* now fix the chunk length */
11838         ch->chunk_length = htons(len + old_len);
11839         chk->book_size = len + old_len;
11840         chk->book_size_scale = 0;
11841         chk->send_size = SCTP_SIZE32(chk->book_size);
11842         SCTP_BUF_LEN(chk->data) = chk->send_size;
11843         return;
11844 }
11845
11846 static void
11847 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11848     uint32_t seq)
11849 {
11850         uint16_t len, old_len;
11851         struct sctp_stream_reset_tsn_request *req_tsn;
11852         struct sctp_chunkhdr *ch;
11853
11854         ch = mtod(chk->data, struct sctp_chunkhdr *);
11855         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11856
11857         /* get to new offset for the param. */
11858         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11859         /* now how long will this param be? */
11860         len = sizeof(struct sctp_stream_reset_tsn_request);
11861         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11862         req_tsn->ph.param_length = htons(len);
11863         req_tsn->request_seq = htonl(seq);
11864
11865         /* now fix the chunk length */
11866         ch->chunk_length = htons(len + old_len);
11867         chk->send_size = len + old_len;
11868         chk->book_size = SCTP_SIZE32(chk->send_size);
11869         chk->book_size_scale = 0;
11870         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11871         return;
11872 }
11873
11874 void
11875 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11876     uint32_t resp_seq, uint32_t result)
11877 {
11878         uint16_t len, old_len;
11879         struct sctp_stream_reset_response *resp;
11880         struct sctp_chunkhdr *ch;
11881
11882         ch = mtod(chk->data, struct sctp_chunkhdr *);
11883         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11884
11885         /* get to new offset for the param. */
11886         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11887         /* now how long will this param be? */
11888         len = sizeof(struct sctp_stream_reset_response);
11889         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11890         resp->ph.param_length = htons(len);
11891         resp->response_seq = htonl(resp_seq);
11892         resp->result = ntohl(result);
11893
11894         /* now fix the chunk length */
11895         ch->chunk_length = htons(len + old_len);
11896         chk->book_size = len + old_len;
11897         chk->book_size_scale = 0;
11898         chk->send_size = SCTP_SIZE32(chk->book_size);
11899         SCTP_BUF_LEN(chk->data) = chk->send_size;
11900         return;
11901 }
11902
11903 void
11904 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11905     struct sctp_stream_reset_list *ent,
11906     int response)
11907 {
11908         struct sctp_association *asoc;
11909         struct sctp_tmit_chunk *chk;
11910         struct sctp_chunkhdr *ch;
11911
11912         asoc = &stcb->asoc;
11913
11914         /*
11915          * Reset our last reset action to the new one IP -> response
11916          * (PERFORMED probably). This assures that if we fail to send, a
11917          * retran from the peer will get the new response.
11918          */
11919         asoc->last_reset_action[0] = response;
11920         if (asoc->stream_reset_outstanding) {
11921                 return;
11922         }
11923         sctp_alloc_a_chunk(stcb, chk);
11924         if (chk == NULL) {
11925                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11926                 return;
11927         }
11928         chk->copy_by_ref = 0;
11929         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11930         chk->rec.chunk_id.can_take_data = 0;
11931         chk->flags = 0;
11932         chk->asoc = &stcb->asoc;
11933         chk->book_size = sizeof(struct sctp_chunkhdr);
11934         chk->send_size = SCTP_SIZE32(chk->book_size);
11935         chk->book_size_scale = 0;
11936         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11937         if (chk->data == NULL) {
11938                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11939                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11940                 return;
11941         }
11942         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11943         /* setup chunk parameters */
11944         chk->sent = SCTP_DATAGRAM_UNSENT;
11945         chk->snd_count = 0;
11946         if (stcb->asoc.alternate) {
11947                 chk->whoTo = stcb->asoc.alternate;
11948         } else {
11949                 chk->whoTo = stcb->asoc.primary_destination;
11950         }
11951         ch = mtod(chk->data, struct sctp_chunkhdr *);
11952         ch->chunk_type = SCTP_STREAM_RESET;
11953         ch->chunk_flags = 0;
11954         ch->chunk_length = htons(chk->book_size);
11955         atomic_add_int(&chk->whoTo->ref_count, 1);
11956         SCTP_BUF_LEN(chk->data) = chk->send_size;
11957         sctp_add_stream_reset_result(chk, ent->seq, response);
11958         /* insert the chunk for sending */
11959         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11960             chk,
11961             sctp_next);
11962         asoc->ctrl_queue_cnt++;
11963 }
11964
11965 void
11966 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11967     uint32_t resp_seq, uint32_t result,
11968     uint32_t send_una, uint32_t recv_next)
11969 {
11970         uint16_t len, old_len;
11971         struct sctp_stream_reset_response_tsn *resp;
11972         struct sctp_chunkhdr *ch;
11973
11974         ch = mtod(chk->data, struct sctp_chunkhdr *);
11975         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11976
11977         /* get to new offset for the param. */
11978         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11979         /* now how long will this param be? */
11980         len = sizeof(struct sctp_stream_reset_response_tsn);
11981         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11982         resp->ph.param_length = htons(len);
11983         resp->response_seq = htonl(resp_seq);
11984         resp->result = htonl(result);
11985         resp->senders_next_tsn = htonl(send_una);
11986         resp->receivers_next_tsn = htonl(recv_next);
11987
11988         /* now fix the chunk length */
11989         ch->chunk_length = htons(len + old_len);
11990         chk->book_size = len + old_len;
11991         chk->send_size = SCTP_SIZE32(chk->book_size);
11992         chk->book_size_scale = 0;
11993         SCTP_BUF_LEN(chk->data) = chk->send_size;
11994         return;
11995 }
11996
11997 static void
11998 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11999     uint32_t seq,
12000     uint16_t adding)
12001 {
12002         uint16_t len, old_len;
12003         struct sctp_chunkhdr *ch;
12004         struct sctp_stream_reset_add_strm *addstr;
12005
12006         ch = mtod(chk->data, struct sctp_chunkhdr *);
12007         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12008
12009         /* get to new offset for the param. */
12010         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12011         /* now how long will this param be? */
12012         len = sizeof(struct sctp_stream_reset_add_strm);
12013
12014         /* Fill it out. */
12015         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12016         addstr->ph.param_length = htons(len);
12017         addstr->request_seq = htonl(seq);
12018         addstr->number_of_streams = htons(adding);
12019         addstr->reserved = 0;
12020
12021         /* now fix the chunk length */
12022         ch->chunk_length = htons(len + old_len);
12023         chk->send_size = len + old_len;
12024         chk->book_size = SCTP_SIZE32(chk->send_size);
12025         chk->book_size_scale = 0;
12026         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12027         return;
12028 }
12029
12030 static void
12031 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12032     uint32_t seq,
12033     uint16_t adding)
12034 {
12035         uint16_t len, old_len;
12036         struct sctp_chunkhdr *ch;
12037         struct sctp_stream_reset_add_strm *addstr;
12038
12039         ch = mtod(chk->data, struct sctp_chunkhdr *);
12040         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12041
12042         /* get to new offset for the param. */
12043         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12044         /* now how long will this param be? */
12045         len = sizeof(struct sctp_stream_reset_add_strm);
12046         /* Fill it out. */
12047         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12048         addstr->ph.param_length = htons(len);
12049         addstr->request_seq = htonl(seq);
12050         addstr->number_of_streams = htons(adding);
12051         addstr->reserved = 0;
12052
12053         /* now fix the chunk length */
12054         ch->chunk_length = htons(len + old_len);
12055         chk->send_size = len + old_len;
12056         chk->book_size = SCTP_SIZE32(chk->send_size);
12057         chk->book_size_scale = 0;
12058         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12059         return;
12060 }
12061
12062 int
12063 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12064 {
12065         struct sctp_association *asoc;
12066         struct sctp_tmit_chunk *chk;
12067         struct sctp_chunkhdr *ch;
12068         uint32_t seq;
12069
12070         asoc = &stcb->asoc;
12071         asoc->trigger_reset = 0;
12072         if (asoc->stream_reset_outstanding) {
12073                 return (EALREADY);
12074         }
12075         sctp_alloc_a_chunk(stcb, chk);
12076         if (chk == NULL) {
12077                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12078                 return (ENOMEM);
12079         }
12080         chk->copy_by_ref = 0;
12081         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12082         chk->rec.chunk_id.can_take_data = 0;
12083         chk->flags = 0;
12084         chk->asoc = &stcb->asoc;
12085         chk->book_size = sizeof(struct sctp_chunkhdr);
12086         chk->send_size = SCTP_SIZE32(chk->book_size);
12087         chk->book_size_scale = 0;
12088         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12089         if (chk->data == NULL) {
12090                 sctp_free_a_chunk(stcb, chk, so_locked);
12091                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12092                 return (ENOMEM);
12093         }
12094         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12095
12096         /* setup chunk parameters */
12097         chk->sent = SCTP_DATAGRAM_UNSENT;
12098         chk->snd_count = 0;
12099         if (stcb->asoc.alternate) {
12100                 chk->whoTo = stcb->asoc.alternate;
12101         } else {
12102                 chk->whoTo = stcb->asoc.primary_destination;
12103         }
12104         ch = mtod(chk->data, struct sctp_chunkhdr *);
12105         ch->chunk_type = SCTP_STREAM_RESET;
12106         ch->chunk_flags = 0;
12107         ch->chunk_length = htons(chk->book_size);
12108         atomic_add_int(&chk->whoTo->ref_count, 1);
12109         SCTP_BUF_LEN(chk->data) = chk->send_size;
12110         seq = stcb->asoc.str_reset_seq_out;
12111         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12112                 seq++;
12113                 asoc->stream_reset_outstanding++;
12114         } else {
12115                 m_freem(chk->data);
12116                 chk->data = NULL;
12117                 sctp_free_a_chunk(stcb, chk, so_locked);
12118                 return (ENOENT);
12119         }
12120         asoc->str_reset = chk;
12121         /* insert the chunk for sending */
12122         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12123             chk,
12124             sctp_next);
12125         asoc->ctrl_queue_cnt++;
12126
12127         if (stcb->asoc.send_sack) {
12128                 sctp_send_sack(stcb, so_locked);
12129         }
12130         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12131         return (0);
12132 }
12133
12134 int
12135 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12136     uint16_t number_entries, uint16_t * list,
12137     uint8_t send_in_req,
12138     uint8_t send_tsn_req,
12139     uint8_t add_stream,
12140     uint16_t adding_o,
12141     uint16_t adding_i, uint8_t peer_asked)
12142 {
12143         struct sctp_association *asoc;
12144         struct sctp_tmit_chunk *chk;
12145         struct sctp_chunkhdr *ch;
12146         int can_send_out_req = 0;
12147         uint32_t seq;
12148
12149         asoc = &stcb->asoc;
12150         if (asoc->stream_reset_outstanding) {
12151                 /*-
12152                  * Already one pending, must get ACK back to clear the flag.
12153                  */
12154                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12155                 return (EBUSY);
12156         }
12157         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12158             (add_stream == 0)) {
12159                 /* nothing to do */
12160                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12161                 return (EINVAL);
12162         }
12163         if (send_tsn_req && send_in_req) {
12164                 /* error, can't do that */
12165                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12166                 return (EINVAL);
12167         } else if (send_in_req) {
12168                 can_send_out_req = 1;
12169         }
12170         if (number_entries > (MCLBYTES -
12171             SCTP_MIN_OVERHEAD -
12172             sizeof(struct sctp_chunkhdr) -
12173             sizeof(struct sctp_stream_reset_out_request)) /
12174             sizeof(uint16_t)) {
12175                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12176                 return (ENOMEM);
12177         }
12178         sctp_alloc_a_chunk(stcb, chk);
12179         if (chk == NULL) {
12180                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12181                 return (ENOMEM);
12182         }
12183         chk->copy_by_ref = 0;
12184         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12185         chk->rec.chunk_id.can_take_data = 0;
12186         chk->flags = 0;
12187         chk->asoc = &stcb->asoc;
12188         chk->book_size = sizeof(struct sctp_chunkhdr);
12189         chk->send_size = SCTP_SIZE32(chk->book_size);
12190         chk->book_size_scale = 0;
12191
12192         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12193         if (chk->data == NULL) {
12194                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12195                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12196                 return (ENOMEM);
12197         }
12198         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12199
12200         /* setup chunk parameters */
12201         chk->sent = SCTP_DATAGRAM_UNSENT;
12202         chk->snd_count = 0;
12203         if (stcb->asoc.alternate) {
12204                 chk->whoTo = stcb->asoc.alternate;
12205         } else {
12206                 chk->whoTo = stcb->asoc.primary_destination;
12207         }
12208         atomic_add_int(&chk->whoTo->ref_count, 1);
12209         ch = mtod(chk->data, struct sctp_chunkhdr *);
12210         ch->chunk_type = SCTP_STREAM_RESET;
12211         ch->chunk_flags = 0;
12212         ch->chunk_length = htons(chk->book_size);
12213         SCTP_BUF_LEN(chk->data) = chk->send_size;
12214
12215         seq = stcb->asoc.str_reset_seq_out;
12216         if (can_send_out_req) {
12217                 int ret;
12218
12219                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12220                 if (ret) {
12221                         seq++;
12222                         asoc->stream_reset_outstanding++;
12223                 }
12224         }
12225         if ((add_stream & 1) &&
12226             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12227                 /* Need to allocate more */
12228                 struct sctp_stream_out *oldstream;
12229                 struct sctp_stream_queue_pending *sp, *nsp;
12230                 int i;
12231
12232 #if defined(SCTP_DETAILED_STR_STATS)
12233                 int j;
12234
12235 #endif
12236
12237                 oldstream = stcb->asoc.strmout;
12238                 /* get some more */
12239                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12240                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12241                     SCTP_M_STRMO);
12242                 if (stcb->asoc.strmout == NULL) {
12243                         uint8_t x;
12244
12245                         stcb->asoc.strmout = oldstream;
12246                         /* Turn off the bit */
12247                         x = add_stream & 0xfe;
12248                         add_stream = x;
12249                         goto skip_stuff;
12250                 }
12251                 /*
12252                  * Ok now we proceed with copying the old out stuff and
12253                  * initializing the new stuff.
12254                  */
12255                 SCTP_TCB_SEND_LOCK(stcb);
12256                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12257                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12258                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12259                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12260                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12261                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12262                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12263                         stcb->asoc.strmout[i].stream_no = i;
12264                         stcb->asoc.strmout[i].state = oldstream[i].state;
12265                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12266                         /* now anything on those queues? */
12267                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12268                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12269                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12270                         }
12271                         /* Now move assoc pointers too */
12272                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12273                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12274                         }
12275                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12276                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12277                         }
12278                 }
12279                 /* now the new streams */
12280                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12281                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12282                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12283                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12284 #if defined(SCTP_DETAILED_STR_STATS)
12285                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12286                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12287                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12288                         }
12289 #else
12290                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12291                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12292 #endif
12293                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12294                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12295                         stcb->asoc.strmout[i].stream_no = i;
12296                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12297                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12298                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12299                 }
12300                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12301                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12302                 SCTP_TCB_SEND_UNLOCK(stcb);
12303         }
12304 skip_stuff:
12305         if ((add_stream & 1) && (adding_o > 0)) {
12306                 asoc->strm_pending_add_size = adding_o;
12307                 asoc->peer_req_out = peer_asked;
12308                 sctp_add_an_out_stream(chk, seq, adding_o);
12309                 seq++;
12310                 asoc->stream_reset_outstanding++;
12311         }
12312         if ((add_stream & 2) && (adding_i > 0)) {
12313                 sctp_add_an_in_stream(chk, seq, adding_i);
12314                 seq++;
12315                 asoc->stream_reset_outstanding++;
12316         }
12317         if (send_in_req) {
12318                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12319                 seq++;
12320                 asoc->stream_reset_outstanding++;
12321         }
12322         if (send_tsn_req) {
12323                 sctp_add_stream_reset_tsn(chk, seq);
12324                 asoc->stream_reset_outstanding++;
12325         }
12326         asoc->str_reset = chk;
12327         /* insert the chunk for sending */
12328         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12329             chk,
12330             sctp_next);
12331         asoc->ctrl_queue_cnt++;
12332         if (stcb->asoc.send_sack) {
12333                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12334         }
12335         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12336         return (0);
12337 }
12338
12339 void
12340 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12341     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12342     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12343     uint32_t vrf_id, uint16_t port)
12344 {
12345         /* Don't respond to an ABORT with an ABORT. */
12346         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12347                 if (cause)
12348                         sctp_m_freem(cause);
12349                 return;
12350         }
12351         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12352             mflowtype, mflowid, fibnum,
12353             vrf_id, port);
12354         return;
12355 }
12356
12357 void
12358 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12359     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12360     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12361     uint32_t vrf_id, uint16_t port)
12362 {
12363         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12364             mflowtype, mflowid, fibnum,
12365             vrf_id, port);
12366         return;
12367 }
12368
12369 static struct mbuf *
12370 sctp_copy_resume(struct uio *uio,
12371     int max_send_len,
12372     int user_marks_eor,
12373     int *error,
12374     uint32_t * sndout,
12375     struct mbuf **new_tail)
12376 {
12377         struct mbuf *m;
12378
12379         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12380             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12381         if (m == NULL) {
12382                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12383                 *error = ENOBUFS;
12384         } else {
12385                 *sndout = m_length(m, NULL);
12386                 *new_tail = m_last(m);
12387         }
12388         return (m);
12389 }
12390
12391 static int
12392 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12393     struct uio *uio,
12394     int resv_upfront)
12395 {
12396         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12397             resv_upfront, 0);
12398         if (sp->data == NULL) {
12399                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12400                 return (ENOBUFS);
12401         }
12402         sp->tail_mbuf = m_last(sp->data);
12403         return (0);
12404 }
12405
12406
12407
12408 static struct sctp_stream_queue_pending *
12409 sctp_copy_it_in(struct sctp_tcb *stcb,
12410     struct sctp_association *asoc,
12411     struct sctp_sndrcvinfo *srcv,
12412     struct uio *uio,
12413     struct sctp_nets *net,
12414     int max_send_len,
12415     int user_marks_eor,
12416     int *error)
12417 {
12418         /*-
12419          * This routine must be very careful in its work. Protocol
12420          * processing is up and running so care must be taken to spl...()
12421          * when you need to do something that may effect the stcb/asoc. The
12422          * sb is locked however. When data is copied the protocol processing
12423          * should be enabled since this is a slower operation...
12424          */
12425         struct sctp_stream_queue_pending *sp = NULL;
12426         int resv_in_first;
12427
12428         *error = 0;
12429         /* Now can we send this? */
12430         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12431             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12432             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12433             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12434                 /* got data while shutting down */
12435                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12436                 *error = ECONNRESET;
12437                 goto out_now;
12438         }
12439         sctp_alloc_a_strmoq(stcb, sp);
12440         if (sp == NULL) {
12441                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12442                 *error = ENOMEM;
12443                 goto out_now;
12444         }
12445         sp->act_flags = 0;
12446         sp->sender_all_done = 0;
12447         sp->sinfo_flags = srcv->sinfo_flags;
12448         sp->timetolive = srcv->sinfo_timetolive;
12449         sp->ppid = srcv->sinfo_ppid;
12450         sp->context = srcv->sinfo_context;
12451         sp->fsn = 0;
12452         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12453
12454         sp->stream = srcv->sinfo_stream;
12455         sp->length = (uint32_t) min(uio->uio_resid, max_send_len);
12456         if ((sp->length == (uint32_t) uio->uio_resid) &&
12457             ((user_marks_eor == 0) ||
12458             (srcv->sinfo_flags & SCTP_EOF) ||
12459             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12460                 sp->msg_is_complete = 1;
12461         } else {
12462                 sp->msg_is_complete = 0;
12463         }
12464         sp->sender_all_done = 0;
12465         sp->some_taken = 0;
12466         sp->put_last_out = 0;
12467         resv_in_first = sizeof(struct sctp_data_chunk);
12468         sp->data = sp->tail_mbuf = NULL;
12469         if (sp->length == 0) {
12470                 *error = 0;
12471                 goto skip_copy;
12472         }
12473         if (srcv->sinfo_keynumber_valid) {
12474                 sp->auth_keyid = srcv->sinfo_keynumber;
12475         } else {
12476                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12477         }
12478         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12479                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12480                 sp->holds_key_ref = 1;
12481         }
12482         *error = sctp_copy_one(sp, uio, resv_in_first);
12483 skip_copy:
12484         if (*error) {
12485                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12486                 sp = NULL;
12487         } else {
12488                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12489                         sp->net = net;
12490                         atomic_add_int(&sp->net->ref_count, 1);
12491                 } else {
12492                         sp->net = NULL;
12493                 }
12494                 sctp_set_prsctp_policy(sp);
12495         }
12496 out_now:
12497         return (sp);
12498 }
12499
12500
12501 int
12502 sctp_sosend(struct socket *so,
12503     struct sockaddr *addr,
12504     struct uio *uio,
12505     struct mbuf *top,
12506     struct mbuf *control,
12507     int flags,
12508     struct thread *p
12509 )
12510 {
12511         int error, use_sndinfo = 0;
12512         struct sctp_sndrcvinfo sndrcvninfo;
12513         struct sockaddr *addr_to_use;
12514
12515 #if defined(INET) && defined(INET6)
12516         struct sockaddr_in sin;
12517
12518 #endif
12519
12520         if (control) {
12521                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12522                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12523                     sizeof(sndrcvninfo))) {
12524                         /* got one */
12525                         use_sndinfo = 1;
12526                 }
12527         }
12528         addr_to_use = addr;
12529 #if defined(INET) && defined(INET6)
12530         if ((addr) && (addr->sa_family == AF_INET6)) {
12531                 struct sockaddr_in6 *sin6;
12532
12533                 sin6 = (struct sockaddr_in6 *)addr;
12534                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12535                         in6_sin6_2_sin(&sin, sin6);
12536                         addr_to_use = (struct sockaddr *)&sin;
12537                 }
12538         }
12539 #endif
12540         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12541             control,
12542             flags,
12543             use_sndinfo ? &sndrcvninfo : NULL
12544             ,p
12545             );
12546         return (error);
12547 }
12548
12549
12550 int
12551 sctp_lower_sosend(struct socket *so,
12552     struct sockaddr *addr,
12553     struct uio *uio,
12554     struct mbuf *i_pak,
12555     struct mbuf *control,
12556     int flags,
12557     struct sctp_sndrcvinfo *srcv
12558     ,
12559     struct thread *p
12560 )
12561 {
12562         unsigned int sndlen = 0, max_len;
12563         int error, len;
12564         struct mbuf *top = NULL;
12565         int queue_only = 0, queue_only_for_init = 0;
12566         int free_cnt_applied = 0;
12567         int un_sent;
12568         int now_filled = 0;
12569         unsigned int inqueue_bytes = 0;
12570         struct sctp_block_entry be;
12571         struct sctp_inpcb *inp;
12572         struct sctp_tcb *stcb = NULL;
12573         struct timeval now;
12574         struct sctp_nets *net;
12575         struct sctp_association *asoc;
12576         struct sctp_inpcb *t_inp;
12577         int user_marks_eor;
12578         int create_lock_applied = 0;
12579         int nagle_applies = 0;
12580         int some_on_control = 0;
12581         int got_all_of_the_send = 0;
12582         int hold_tcblock = 0;
12583         int non_blocking = 0;
12584         uint32_t local_add_more, local_soresv = 0;
12585         uint16_t port;
12586         uint16_t sinfo_flags;
12587         sctp_assoc_t sinfo_assoc_id;
12588
12589         error = 0;
12590         net = NULL;
12591         stcb = NULL;
12592         asoc = NULL;
12593
12594         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12595         if (inp == NULL) {
12596                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12597                 error = EINVAL;
12598                 if (i_pak) {
12599                         SCTP_RELEASE_PKT(i_pak);
12600                 }
12601                 return (error);
12602         }
12603         if ((uio == NULL) && (i_pak == NULL)) {
12604                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12605                 return (EINVAL);
12606         }
12607         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12608         atomic_add_int(&inp->total_sends, 1);
12609         if (uio) {
12610                 if (uio->uio_resid < 0) {
12611                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12612                         return (EINVAL);
12613                 }
12614                 sndlen = (unsigned int)uio->uio_resid;
12615         } else {
12616                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12617                 sndlen = SCTP_HEADER_LEN(i_pak);
12618         }
12619         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12620             (void *)addr,
12621             sndlen);
12622         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12623             (inp->sctp_socket->so_qlimit)) {
12624                 /* The listener can NOT send */
12625                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12626                 error = ENOTCONN;
12627                 goto out_unlocked;
12628         }
12629         /**
12630          * Pre-screen address, if one is given the sin-len
12631          * must be set correctly!
12632          */
12633         if (addr) {
12634                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12635
12636                 switch (raddr->sa.sa_family) {
12637 #ifdef INET
12638                 case AF_INET:
12639                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12640                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12641                                 error = EINVAL;
12642                                 goto out_unlocked;
12643                         }
12644                         port = raddr->sin.sin_port;
12645                         break;
12646 #endif
12647 #ifdef INET6
12648                 case AF_INET6:
12649                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12650                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12651                                 error = EINVAL;
12652                                 goto out_unlocked;
12653                         }
12654                         port = raddr->sin6.sin6_port;
12655                         break;
12656 #endif
12657                 default:
12658                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12659                         error = EAFNOSUPPORT;
12660                         goto out_unlocked;
12661                 }
12662         } else
12663                 port = 0;
12664
12665         if (srcv) {
12666                 sinfo_flags = srcv->sinfo_flags;
12667                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12668                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12669                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12670                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12671                         error = EINVAL;
12672                         goto out_unlocked;
12673                 }
12674                 if (srcv->sinfo_flags)
12675                         SCTP_STAT_INCR(sctps_sends_with_flags);
12676         } else {
12677                 sinfo_flags = inp->def_send.sinfo_flags;
12678                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12679         }
12680         if (sinfo_flags & SCTP_SENDALL) {
12681                 /* its a sendall */
12682                 error = sctp_sendall(inp, uio, top, srcv);
12683                 top = NULL;
12684                 goto out_unlocked;
12685         }
12686         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12687                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12688                 error = EINVAL;
12689                 goto out_unlocked;
12690         }
12691         /* now we must find the assoc */
12692         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12693             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12694                 SCTP_INP_RLOCK(inp);
12695                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12696                 if (stcb) {
12697                         SCTP_TCB_LOCK(stcb);
12698                         hold_tcblock = 1;
12699                 }
12700                 SCTP_INP_RUNLOCK(inp);
12701         } else if (sinfo_assoc_id) {
12702                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12703         } else if (addr) {
12704                 /*-
12705                  * Since we did not use findep we must
12706                  * increment it, and if we don't find a tcb
12707                  * decrement it.
12708                  */
12709                 SCTP_INP_WLOCK(inp);
12710                 SCTP_INP_INCR_REF(inp);
12711                 SCTP_INP_WUNLOCK(inp);
12712                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12713                 if (stcb == NULL) {
12714                         SCTP_INP_WLOCK(inp);
12715                         SCTP_INP_DECR_REF(inp);
12716                         SCTP_INP_WUNLOCK(inp);
12717                 } else {
12718                         hold_tcblock = 1;
12719                 }
12720         }
12721         if ((stcb == NULL) && (addr)) {
12722                 /* Possible implicit send? */
12723                 SCTP_ASOC_CREATE_LOCK(inp);
12724                 create_lock_applied = 1;
12725                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12726                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12727                         /* Should I really unlock ? */
12728                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12729                         error = EINVAL;
12730                         goto out_unlocked;
12731
12732                 }
12733                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12734                     (addr->sa_family == AF_INET6)) {
12735                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12736                         error = EINVAL;
12737                         goto out_unlocked;
12738                 }
12739                 SCTP_INP_WLOCK(inp);
12740                 SCTP_INP_INCR_REF(inp);
12741                 SCTP_INP_WUNLOCK(inp);
12742                 /* With the lock applied look again */
12743                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12744                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12745                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12746                 }
12747                 if (stcb == NULL) {
12748                         SCTP_INP_WLOCK(inp);
12749                         SCTP_INP_DECR_REF(inp);
12750                         SCTP_INP_WUNLOCK(inp);
12751                 } else {
12752                         hold_tcblock = 1;
12753                 }
12754                 if (error) {
12755                         goto out_unlocked;
12756                 }
12757                 if (t_inp != inp) {
12758                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12759                         error = ENOTCONN;
12760                         goto out_unlocked;
12761                 }
12762         }
12763         if (stcb == NULL) {
12764                 if (addr == NULL) {
12765                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12766                         error = ENOENT;
12767                         goto out_unlocked;
12768                 } else {
12769                         /* We must go ahead and start the INIT process */
12770                         uint32_t vrf_id;
12771
12772                         if ((sinfo_flags & SCTP_ABORT) ||
12773                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12774                                 /*-
12775                                  * User asks to abort a non-existant assoc,
12776                                  * or EOF a non-existant assoc with no data
12777                                  */
12778                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12779                                 error = ENOENT;
12780                                 goto out_unlocked;
12781                         }
12782                         /* get an asoc/stcb struct */
12783                         vrf_id = inp->def_vrf_id;
12784 #ifdef INVARIANTS
12785                         if (create_lock_applied == 0) {
12786                                 panic("Error, should hold create lock and I don't?");
12787                         }
12788 #endif
12789                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12790                             inp->sctp_ep.pre_open_stream_count,
12791                             inp->sctp_ep.port,
12792                             p);
12793                         if (stcb == NULL) {
12794                                 /* Error is setup for us in the call */
12795                                 goto out_unlocked;
12796                         }
12797                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12798                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12799                                 /*
12800                                  * Set the connected flag so we can queue
12801                                  * data
12802                                  */
12803                                 soisconnecting(so);
12804                         }
12805                         hold_tcblock = 1;
12806                         if (create_lock_applied) {
12807                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12808                                 create_lock_applied = 0;
12809                         } else {
12810                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12811                         }
12812                         /*
12813                          * Turn on queue only flag to prevent data from
12814                          * being sent
12815                          */
12816                         queue_only = 1;
12817                         asoc = &stcb->asoc;
12818                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12819                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12820
12821                         /* initialize authentication params for the assoc */
12822                         sctp_initialize_auth_params(inp, stcb);
12823
12824                         if (control) {
12825                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12826                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12827                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12828                                         hold_tcblock = 0;
12829                                         stcb = NULL;
12830                                         goto out_unlocked;
12831                                 }
12832                         }
12833                         /* out with the INIT */
12834                         queue_only_for_init = 1;
12835                         /*-
12836                          * we may want to dig in after this call and adjust the MTU
12837                          * value. It defaulted to 1500 (constant) but the ro
12838                          * structure may now have an update and thus we may need to
12839                          * change it BEFORE we append the message.
12840                          */
12841                 }
12842         } else
12843                 asoc = &stcb->asoc;
12844         if (srcv == NULL)
12845                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12846         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12847                 if (addr)
12848                         net = sctp_findnet(stcb, addr);
12849                 else
12850                         net = NULL;
12851                 if ((net == NULL) ||
12852                     ((port != 0) && (port != stcb->rport))) {
12853                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12854                         error = EINVAL;
12855                         goto out_unlocked;
12856                 }
12857         } else {
12858                 if (stcb->asoc.alternate) {
12859                         net = stcb->asoc.alternate;
12860                 } else {
12861                         net = stcb->asoc.primary_destination;
12862                 }
12863         }
12864         atomic_add_int(&stcb->total_sends, 1);
12865         /* Keep the stcb from being freed under our feet */
12866         atomic_add_int(&asoc->refcnt, 1);
12867         free_cnt_applied = 1;
12868
12869         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12870                 if (sndlen > asoc->smallest_mtu) {
12871                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12872                         error = EMSGSIZE;
12873                         goto out_unlocked;
12874                 }
12875         }
12876         if (SCTP_SO_IS_NBIO(so)
12877             || (flags & MSG_NBIO)
12878             ) {
12879                 non_blocking = 1;
12880         }
12881         /* would we block? */
12882         if (non_blocking) {
12883                 if (hold_tcblock == 0) {
12884                         SCTP_TCB_LOCK(stcb);
12885                         hold_tcblock = 1;
12886                 }
12887                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12888                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12889                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12890                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12891                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12892                                 error = EMSGSIZE;
12893                         else
12894                                 error = EWOULDBLOCK;
12895                         goto out_unlocked;
12896                 }
12897                 stcb->asoc.sb_send_resv += sndlen;
12898                 SCTP_TCB_UNLOCK(stcb);
12899                 hold_tcblock = 0;
12900         } else {
12901                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12902         }
12903         local_soresv = sndlen;
12904         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12905                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12906                 error = ECONNRESET;
12907                 goto out_unlocked;
12908         }
12909         if (create_lock_applied) {
12910                 SCTP_ASOC_CREATE_UNLOCK(inp);
12911                 create_lock_applied = 0;
12912         }
12913         /* Is the stream no. valid? */
12914         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12915                 /* Invalid stream number */
12916                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12917                 error = EINVAL;
12918                 goto out_unlocked;
12919         }
12920         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12921             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12922                 /*
12923                  * Can't queue any data while stream reset is underway.
12924                  */
12925                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12926                         error = EAGAIN;
12927                 } else {
12928                         error = EINVAL;
12929                 }
12930                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12931                 goto out_unlocked;
12932         }
12933         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12934             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12935                 queue_only = 1;
12936         }
12937         /* we are now done with all control */
12938         if (control) {
12939                 sctp_m_freem(control);
12940                 control = NULL;
12941         }
12942         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12943             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12944             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12945             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12946                 if (srcv->sinfo_flags & SCTP_ABORT) {
12947                         ;
12948                 } else {
12949                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12950                         error = ECONNRESET;
12951                         goto out_unlocked;
12952                 }
12953         }
12954         /* Ok, we will attempt a msgsnd :> */
12955         if (p) {
12956                 p->td_ru.ru_msgsnd++;
12957         }
12958         /* Are we aborting? */
12959         if (srcv->sinfo_flags & SCTP_ABORT) {
12960                 struct mbuf *mm;
12961                 int tot_demand, tot_out = 0, max_out;
12962
12963                 SCTP_STAT_INCR(sctps_sends_with_abort);
12964                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12965                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12966                         /* It has to be up before we abort */
12967                         /* how big is the user initiated abort? */
12968                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12969                         error = EINVAL;
12970                         goto out;
12971                 }
12972                 if (hold_tcblock) {
12973                         SCTP_TCB_UNLOCK(stcb);
12974                         hold_tcblock = 0;
12975                 }
12976                 if (top) {
12977                         struct mbuf *cntm = NULL;
12978
12979                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12980                         if (sndlen != 0) {
12981                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12982                                         tot_out += SCTP_BUF_LEN(cntm);
12983                                 }
12984                         }
12985                 } else {
12986                         /* Must fit in a MTU */
12987                         tot_out = sndlen;
12988                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12989                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12990                                 /* To big */
12991                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12992                                 error = EMSGSIZE;
12993                                 goto out;
12994                         }
12995                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12996                 }
12997                 if (mm == NULL) {
12998                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12999                         error = ENOMEM;
13000                         goto out;
13001                 }
13002                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13003                 max_out -= sizeof(struct sctp_abort_msg);
13004                 if (tot_out > max_out) {
13005                         tot_out = max_out;
13006                 }
13007                 if (mm) {
13008                         struct sctp_paramhdr *ph;
13009
13010                         /* now move forward the data pointer */
13011                         ph = mtod(mm, struct sctp_paramhdr *);
13012                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13013                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + tot_out));
13014                         ph++;
13015                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13016                         if (top == NULL) {
13017                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13018                                 if (error) {
13019                                         /*-
13020                                          * Here if we can't get his data we
13021                                          * still abort we just don't get to
13022                                          * send the users note :-0
13023                                          */
13024                                         sctp_m_freem(mm);
13025                                         mm = NULL;
13026                                 }
13027                         } else {
13028                                 if (sndlen != 0) {
13029                                         SCTP_BUF_NEXT(mm) = top;
13030                                 }
13031                         }
13032                 }
13033                 if (hold_tcblock == 0) {
13034                         SCTP_TCB_LOCK(stcb);
13035                 }
13036                 atomic_add_int(&stcb->asoc.refcnt, -1);
13037                 free_cnt_applied = 0;
13038                 /* release this lock, otherwise we hang on ourselves */
13039                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13040                 /* now relock the stcb so everything is sane */
13041                 hold_tcblock = 0;
13042                 stcb = NULL;
13043                 /*
13044                  * In this case top is already chained to mm avoid double
13045                  * free, since we free it below if top != NULL and driver
13046                  * would free it after sending the packet out
13047                  */
13048                 if (sndlen != 0) {
13049                         top = NULL;
13050                 }
13051                 goto out_unlocked;
13052         }
13053         /* Calculate the maximum we can send */
13054         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13055         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13056                 if (non_blocking) {
13057                         /* we already checked for non-blocking above. */
13058                         max_len = sndlen;
13059                 } else {
13060                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13061                 }
13062         } else {
13063                 max_len = 0;
13064         }
13065         if (hold_tcblock) {
13066                 SCTP_TCB_UNLOCK(stcb);
13067                 hold_tcblock = 0;
13068         }
13069         if (asoc->strmout == NULL) {
13070                 /* huh? software error */
13071                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13072                 error = EFAULT;
13073                 goto out_unlocked;
13074         }
13075         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13076         if ((user_marks_eor == 0) &&
13077             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13078                 /* It will NEVER fit */
13079                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13080                 error = EMSGSIZE;
13081                 goto out_unlocked;
13082         }
13083         if ((uio == NULL) && user_marks_eor) {
13084                 /*-
13085                  * We do not support eeor mode for
13086                  * sending with mbuf chains (like sendfile).
13087                  */
13088                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13089                 error = EINVAL;
13090                 goto out_unlocked;
13091         }
13092         if (user_marks_eor) {
13093                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13094         } else {
13095                 /*-
13096                  * For non-eeor the whole message must fit in
13097                  * the socket send buffer.
13098                  */
13099                 local_add_more = sndlen;
13100         }
13101         len = 0;
13102         if (non_blocking) {
13103                 goto skip_preblock;
13104         }
13105         if (((max_len <= local_add_more) &&
13106             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13107             (max_len == 0) ||
13108             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13109                 /* No room right now ! */
13110                 SOCKBUF_LOCK(&so->so_snd);
13111                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13112                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13113                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13114                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13115                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13116                             inqueue_bytes,
13117                             local_add_more,
13118                             stcb->asoc.stream_queue_cnt,
13119                             stcb->asoc.chunks_on_out_queue,
13120                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13121                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13122                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13123                         }
13124                         be.error = 0;
13125                         stcb->block_entry = &be;
13126                         error = sbwait(&so->so_snd);
13127                         stcb->block_entry = NULL;
13128                         if (error || so->so_error || be.error) {
13129                                 if (error == 0) {
13130                                         if (so->so_error)
13131                                                 error = so->so_error;
13132                                         if (be.error) {
13133                                                 error = be.error;
13134                                         }
13135                                 }
13136                                 SOCKBUF_UNLOCK(&so->so_snd);
13137                                 goto out_unlocked;
13138                         }
13139                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13140                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13141                                     asoc, stcb->asoc.total_output_queue_size);
13142                         }
13143                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13144                                 SOCKBUF_UNLOCK(&so->so_snd);
13145                                 goto out_unlocked;
13146                         }
13147                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13148                 }
13149                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13150                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13151                 } else {
13152                         max_len = 0;
13153                 }
13154                 SOCKBUF_UNLOCK(&so->so_snd);
13155         }
13156 skip_preblock:
13157         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13158                 goto out_unlocked;
13159         }
13160         /*
13161          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13162          * case NOTE: uio will be null when top/mbuf is passed
13163          */
13164         if (sndlen == 0) {
13165                 if (srcv->sinfo_flags & SCTP_EOF) {
13166                         got_all_of_the_send = 1;
13167                         goto dataless_eof;
13168                 } else {
13169                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13170                         error = EINVAL;
13171                         goto out;
13172                 }
13173         }
13174         if (top == NULL) {
13175                 struct sctp_stream_queue_pending *sp;
13176                 struct sctp_stream_out *strm;
13177                 uint32_t sndout;
13178
13179                 SCTP_TCB_SEND_LOCK(stcb);
13180                 if ((asoc->stream_locked) &&
13181                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13182                         SCTP_TCB_SEND_UNLOCK(stcb);
13183                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13184                         error = EINVAL;
13185                         goto out;
13186                 }
13187                 SCTP_TCB_SEND_UNLOCK(stcb);
13188
13189                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13190                 if (strm->last_msg_incomplete == 0) {
13191         do_a_copy_in:
13192                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13193                         if ((sp == NULL) || (error)) {
13194                                 goto out;
13195                         }
13196                         SCTP_TCB_SEND_LOCK(stcb);
13197                         if (sp->msg_is_complete) {
13198                                 strm->last_msg_incomplete = 0;
13199                                 asoc->stream_locked = 0;
13200                         } else {
13201                                 /*
13202                                  * Just got locked to this guy in case of an
13203                                  * interrupt.
13204                                  */
13205                                 strm->last_msg_incomplete = 1;
13206                                 if (stcb->asoc.idata_supported == 0) {
13207                                         asoc->stream_locked = 1;
13208                                         asoc->stream_locked_on = srcv->sinfo_stream;
13209                                 }
13210                                 sp->sender_all_done = 0;
13211                         }
13212                         sctp_snd_sb_alloc(stcb, sp->length);
13213                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13214                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13215                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13216                         }
13217                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13218                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13219                         SCTP_TCB_SEND_UNLOCK(stcb);
13220                 } else {
13221                         SCTP_TCB_SEND_LOCK(stcb);
13222                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13223                         SCTP_TCB_SEND_UNLOCK(stcb);
13224                         if (sp == NULL) {
13225                                 /* ???? Huh ??? last msg is gone */
13226 #ifdef INVARIANTS
13227                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13228 #else
13229                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13230                                 strm->last_msg_incomplete = 0;
13231 #endif
13232                                 goto do_a_copy_in;
13233
13234                         }
13235                 }
13236                 while (uio->uio_resid > 0) {
13237                         /* How much room do we have? */
13238                         struct mbuf *new_tail, *mm;
13239
13240                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13241                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13242                         else
13243                                 max_len = 0;
13244
13245                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13246                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13247                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13248                                 sndout = 0;
13249                                 new_tail = NULL;
13250                                 if (hold_tcblock) {
13251                                         SCTP_TCB_UNLOCK(stcb);
13252                                         hold_tcblock = 0;
13253                                 }
13254                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13255                                 if ((mm == NULL) || error) {
13256                                         if (mm) {
13257                                                 sctp_m_freem(mm);
13258                                         }
13259                                         goto out;
13260                                 }
13261                                 /* Update the mbuf and count */
13262                                 SCTP_TCB_SEND_LOCK(stcb);
13263                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13264                                         /*
13265                                          * we need to get out. Peer probably
13266                                          * aborted.
13267                                          */
13268                                         sctp_m_freem(mm);
13269                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13270                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13271                                                 error = ECONNRESET;
13272                                         }
13273                                         SCTP_TCB_SEND_UNLOCK(stcb);
13274                                         goto out;
13275                                 }
13276                                 if (sp->tail_mbuf) {
13277                                         /* tack it to the end */
13278                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13279                                         sp->tail_mbuf = new_tail;
13280                                 } else {
13281                                         /* A stolen mbuf */
13282                                         sp->data = mm;
13283                                         sp->tail_mbuf = new_tail;
13284                                 }
13285                                 sctp_snd_sb_alloc(stcb, sndout);
13286                                 atomic_add_int(&sp->length, sndout);
13287                                 len += sndout;
13288                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13289                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13290                                 }
13291                                 /* Did we reach EOR? */
13292                                 if ((uio->uio_resid == 0) &&
13293                                     ((user_marks_eor == 0) ||
13294                                     (srcv->sinfo_flags & SCTP_EOF) ||
13295                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13296                                         sp->msg_is_complete = 1;
13297                                 } else {
13298                                         sp->msg_is_complete = 0;
13299                                 }
13300                                 SCTP_TCB_SEND_UNLOCK(stcb);
13301                         }
13302                         if (uio->uio_resid == 0) {
13303                                 /* got it all? */
13304                                 continue;
13305                         }
13306                         /* PR-SCTP? */
13307                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13308                                 /*
13309                                  * This is ugly but we must assure locking
13310                                  * order
13311                                  */
13312                                 if (hold_tcblock == 0) {
13313                                         SCTP_TCB_LOCK(stcb);
13314                                         hold_tcblock = 1;
13315                                 }
13316                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13317                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13318                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13319                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13320                                 else
13321                                         max_len = 0;
13322                                 if (max_len > 0) {
13323                                         continue;
13324                                 }
13325                                 SCTP_TCB_UNLOCK(stcb);
13326                                 hold_tcblock = 0;
13327                         }
13328                         /* wait for space now */
13329                         if (non_blocking) {
13330                                 /* Non-blocking io in place out */
13331                                 goto skip_out_eof;
13332                         }
13333                         /* What about the INIT, send it maybe */
13334                         if (queue_only_for_init) {
13335                                 if (hold_tcblock == 0) {
13336                                         SCTP_TCB_LOCK(stcb);
13337                                         hold_tcblock = 1;
13338                                 }
13339                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13340                                         /* a collision took us forward? */
13341                                         queue_only = 0;
13342                                 } else {
13343                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13344                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13345                                         queue_only = 1;
13346                                 }
13347                         }
13348                         if ((net->flight_size > net->cwnd) &&
13349                             (asoc->sctp_cmt_on_off == 0)) {
13350                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13351                                 queue_only = 1;
13352                         } else if (asoc->ifp_had_enobuf) {
13353                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13354                                 if (net->flight_size > (2 * net->mtu)) {
13355                                         queue_only = 1;
13356                                 }
13357                                 asoc->ifp_had_enobuf = 0;
13358                         }
13359                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13360                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13361                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13362                             (stcb->asoc.total_flight > 0) &&
13363                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13364                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13365
13366                                 /*-
13367                                  * Ok, Nagle is set on and we have data outstanding.
13368                                  * Don't send anything and let SACKs drive out the
13369                                  * data unless we have a "full" segment to send.
13370                                  */
13371                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13372                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13373                                 }
13374                                 SCTP_STAT_INCR(sctps_naglequeued);
13375                                 nagle_applies = 1;
13376                         } else {
13377                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13378                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13379                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13380                                 }
13381                                 SCTP_STAT_INCR(sctps_naglesent);
13382                                 nagle_applies = 0;
13383                         }
13384                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13385
13386                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13387                                     nagle_applies, un_sent);
13388                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13389                                     stcb->asoc.total_flight,
13390                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13391                         }
13392                         if (queue_only_for_init)
13393                                 queue_only_for_init = 0;
13394                         if ((queue_only == 0) && (nagle_applies == 0)) {
13395                                 /*-
13396                                  * need to start chunk output
13397                                  * before blocking.. note that if
13398                                  * a lock is already applied, then
13399                                  * the input via the net is happening
13400                                  * and I don't need to start output :-D
13401                                  */
13402                                 if (hold_tcblock == 0) {
13403                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13404                                                 hold_tcblock = 1;
13405                                                 sctp_chunk_output(inp,
13406                                                     stcb,
13407                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13408                                         }
13409                                 } else {
13410                                         sctp_chunk_output(inp,
13411                                             stcb,
13412                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13413                                 }
13414                                 if (hold_tcblock == 1) {
13415                                         SCTP_TCB_UNLOCK(stcb);
13416                                         hold_tcblock = 0;
13417                                 }
13418                         }
13419                         SOCKBUF_LOCK(&so->so_snd);
13420                         /*-
13421                          * This is a bit strange, but I think it will
13422                          * work. The total_output_queue_size is locked and
13423                          * protected by the TCB_LOCK, which we just released.
13424                          * There is a race that can occur between releasing it
13425                          * above, and me getting the socket lock, where sacks
13426                          * come in but we have not put the SB_WAIT on the
13427                          * so_snd buffer to get the wakeup. After the LOCK
13428                          * is applied the sack_processing will also need to
13429                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13430                          * once we have the socket buffer lock if we recheck the
13431                          * size we KNOW we will get to sleep safely with the
13432                          * wakeup flag in place.
13433                          */
13434                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13435                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13436                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13437                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13438                                             asoc, (size_t)uio->uio_resid);
13439                                 }
13440                                 be.error = 0;
13441                                 stcb->block_entry = &be;
13442                                 error = sbwait(&so->so_snd);
13443                                 stcb->block_entry = NULL;
13444
13445                                 if (error || so->so_error || be.error) {
13446                                         if (error == 0) {
13447                                                 if (so->so_error)
13448                                                         error = so->so_error;
13449                                                 if (be.error) {
13450                                                         error = be.error;
13451                                                 }
13452                                         }
13453                                         SOCKBUF_UNLOCK(&so->so_snd);
13454                                         goto out_unlocked;
13455                                 }
13456                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13457                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13458                                             asoc, stcb->asoc.total_output_queue_size);
13459                                 }
13460                         }
13461                         SOCKBUF_UNLOCK(&so->so_snd);
13462                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13463                                 goto out_unlocked;
13464                         }
13465                 }
13466                 SCTP_TCB_SEND_LOCK(stcb);
13467                 if (sp) {
13468                         if (sp->msg_is_complete == 0) {
13469                                 strm->last_msg_incomplete = 1;
13470                                 if (stcb->asoc.idata_supported == 0) {
13471                                         asoc->stream_locked = 1;
13472                                         asoc->stream_locked_on = srcv->sinfo_stream;
13473                                 }
13474                         } else {
13475                                 sp->sender_all_done = 1;
13476                                 strm->last_msg_incomplete = 0;
13477                                 asoc->stream_locked = 0;
13478                         }
13479                 } else {
13480                         SCTP_PRINTF("Huh no sp TSNH?\n");
13481                         strm->last_msg_incomplete = 0;
13482                         asoc->stream_locked = 0;
13483                 }
13484                 SCTP_TCB_SEND_UNLOCK(stcb);
13485                 if (uio->uio_resid == 0) {
13486                         got_all_of_the_send = 1;
13487                 }
13488         } else {
13489                 /* We send in a 0, since we do NOT have any locks */
13490                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13491                 top = NULL;
13492                 if (srcv->sinfo_flags & SCTP_EOF) {
13493                         /*
13494                          * This should only happen for Panda for the mbuf
13495                          * send case, which does NOT yet support EEOR mode.
13496                          * Thus, we can just set this flag to do the proper
13497                          * EOF handling.
13498                          */
13499                         got_all_of_the_send = 1;
13500                 }
13501         }
13502         if (error) {
13503                 goto out;
13504         }
13505 dataless_eof:
13506         /* EOF thing ? */
13507         if ((srcv->sinfo_flags & SCTP_EOF) &&
13508             (got_all_of_the_send == 1)) {
13509                 int cnt;
13510
13511                 SCTP_STAT_INCR(sctps_sends_with_eof);
13512                 error = 0;
13513                 if (hold_tcblock == 0) {
13514                         SCTP_TCB_LOCK(stcb);
13515                         hold_tcblock = 1;
13516                 }
13517                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13518                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13519                     TAILQ_EMPTY(&asoc->sent_queue) &&
13520                     (cnt == 0)) {
13521                         if (asoc->locked_on_sending) {
13522                                 goto abort_anyway;
13523                         }
13524                         /* there is nothing queued to send, so I'm done... */
13525                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13526                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13527                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13528                                 struct sctp_nets *netp;
13529
13530                                 /* only send SHUTDOWN the first time through */
13531                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13532                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13533                                 }
13534                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13535                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13536                                 sctp_stop_timers_for_shutdown(stcb);
13537                                 if (stcb->asoc.alternate) {
13538                                         netp = stcb->asoc.alternate;
13539                                 } else {
13540                                         netp = stcb->asoc.primary_destination;
13541                                 }
13542                                 sctp_send_shutdown(stcb, netp);
13543                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13544                                     netp);
13545                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13546                                     asoc->primary_destination);
13547                         }
13548                 } else {
13549                         /*-
13550                          * we still got (or just got) data to send, so set
13551                          * SHUTDOWN_PENDING
13552                          */
13553                         /*-
13554                          * XXX sockets draft says that SCTP_EOF should be
13555                          * sent with no data.  currently, we will allow user
13556                          * data to be sent first and move to
13557                          * SHUTDOWN-PENDING
13558                          */
13559                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13560                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13561                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13562                                 if (hold_tcblock == 0) {
13563                                         SCTP_TCB_LOCK(stcb);
13564                                         hold_tcblock = 1;
13565                                 }
13566                                 if (asoc->locked_on_sending) {
13567                                         /* Locked to send out the data */
13568                                         struct sctp_stream_queue_pending *sp;
13569
13570                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13571                                         if (sp) {
13572                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13573                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13574                                         }
13575                                 }
13576                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13577                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13578                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13579                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13580                                         struct mbuf *op_err;
13581                                         char msg[SCTP_DIAG_INFO_LEN];
13582
13583                         abort_anyway:
13584                                         if (free_cnt_applied) {
13585                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13586                                                 free_cnt_applied = 0;
13587                                         }
13588                                         snprintf(msg, sizeof(msg),
13589                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13590                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13591                                             msg);
13592                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13593                                             op_err, SCTP_SO_LOCKED);
13594                                         /*
13595                                          * now relock the stcb so everything
13596                                          * is sane
13597                                          */
13598                                         hold_tcblock = 0;
13599                                         stcb = NULL;
13600                                         goto out;
13601                                 }
13602                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13603                                     asoc->primary_destination);
13604                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13605                         }
13606                 }
13607         }
13608 skip_out_eof:
13609         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13610                 some_on_control = 1;
13611         }
13612         if (queue_only_for_init) {
13613                 if (hold_tcblock == 0) {
13614                         SCTP_TCB_LOCK(stcb);
13615                         hold_tcblock = 1;
13616                 }
13617                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13618                         /* a collision took us forward? */
13619                         queue_only = 0;
13620                 } else {
13621                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13622                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13623                         queue_only = 1;
13624                 }
13625         }
13626         if ((net->flight_size > net->cwnd) &&
13627             (stcb->asoc.sctp_cmt_on_off == 0)) {
13628                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13629                 queue_only = 1;
13630         } else if (asoc->ifp_had_enobuf) {
13631                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13632                 if (net->flight_size > (2 * net->mtu)) {
13633                         queue_only = 1;
13634                 }
13635                 asoc->ifp_had_enobuf = 0;
13636         }
13637         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13638             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13639         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13640             (stcb->asoc.total_flight > 0) &&
13641             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13642             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13643                 /*-
13644                  * Ok, Nagle is set on and we have data outstanding.
13645                  * Don't send anything and let SACKs drive out the
13646                  * data unless wen have a "full" segment to send.
13647                  */
13648                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13649                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13650                 }
13651                 SCTP_STAT_INCR(sctps_naglequeued);
13652                 nagle_applies = 1;
13653         } else {
13654                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13655                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13656                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13657                 }
13658                 SCTP_STAT_INCR(sctps_naglesent);
13659                 nagle_applies = 0;
13660         }
13661         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13662                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13663                     nagle_applies, un_sent);
13664                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13665                     stcb->asoc.total_flight,
13666                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13667         }
13668         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13669                 /* we can attempt to send too. */
13670                 if (hold_tcblock == 0) {
13671                         /*
13672                          * If there is activity recv'ing sacks no need to
13673                          * send
13674                          */
13675                         if (SCTP_TCB_TRYLOCK(stcb)) {
13676                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13677                                 hold_tcblock = 1;
13678                         }
13679                 } else {
13680                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13681                 }
13682         } else if ((queue_only == 0) &&
13683                     (stcb->asoc.peers_rwnd == 0) &&
13684             (stcb->asoc.total_flight == 0)) {
13685                 /* We get to have a probe outstanding */
13686                 if (hold_tcblock == 0) {
13687                         hold_tcblock = 1;
13688                         SCTP_TCB_LOCK(stcb);
13689                 }
13690                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13691         } else if (some_on_control) {
13692                 int num_out, reason, frag_point;
13693
13694                 /* Here we do control only */
13695                 if (hold_tcblock == 0) {
13696                         hold_tcblock = 1;
13697                         SCTP_TCB_LOCK(stcb);
13698                 }
13699                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13700                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13701                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13702         }
13703         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13704             queue_only, stcb->asoc.peers_rwnd, un_sent,
13705             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13706             stcb->asoc.total_output_queue_size, error);
13707
13708 out:
13709 out_unlocked:
13710
13711         if (local_soresv && stcb) {
13712                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13713         }
13714         if (create_lock_applied) {
13715                 SCTP_ASOC_CREATE_UNLOCK(inp);
13716         }
13717         if ((stcb) && hold_tcblock) {
13718                 SCTP_TCB_UNLOCK(stcb);
13719         }
13720         if (stcb && free_cnt_applied) {
13721                 atomic_add_int(&stcb->asoc.refcnt, -1);
13722         }
13723 #ifdef INVARIANTS
13724         if (stcb) {
13725                 if (mtx_owned(&stcb->tcb_mtx)) {
13726                         panic("Leaving with tcb mtx owned?");
13727                 }
13728                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13729                         panic("Leaving with tcb send mtx owned?");
13730                 }
13731         }
13732 #endif
13733         if (top) {
13734                 sctp_m_freem(top);
13735         }
13736         if (control) {
13737                 sctp_m_freem(control);
13738         }
13739         return (error);
13740 }
13741
13742
13743 /*
13744  * generate an AUTHentication chunk, if required
13745  */
13746 struct mbuf *
13747 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13748     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13749     struct sctp_tcb *stcb, uint8_t chunk)
13750 {
13751         struct mbuf *m_auth;
13752         struct sctp_auth_chunk *auth;
13753         int chunk_len;
13754         struct mbuf *cn;
13755
13756         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13757             (stcb == NULL))
13758                 return (m);
13759
13760         if (stcb->asoc.auth_supported == 0) {
13761                 return (m);
13762         }
13763         /* does the requested chunk require auth? */
13764         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13765                 return (m);
13766         }
13767         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13768         if (m_auth == NULL) {
13769                 /* no mbuf's */
13770                 return (m);
13771         }
13772         /* reserve some space if this will be the first mbuf */
13773         if (m == NULL)
13774                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13775         /* fill in the AUTH chunk details */
13776         auth = mtod(m_auth, struct sctp_auth_chunk *);
13777         bzero(auth, sizeof(*auth));
13778         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13779         auth->ch.chunk_flags = 0;
13780         chunk_len = sizeof(*auth) +
13781             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13782         auth->ch.chunk_length = htons(chunk_len);
13783         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13784         /* key id and hmac digest will be computed and filled in upon send */
13785
13786         /* save the offset where the auth was inserted into the chain */
13787         *offset = 0;
13788         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13789                 *offset += SCTP_BUF_LEN(cn);
13790         }
13791
13792         /* update length and return pointer to the auth chunk */
13793         SCTP_BUF_LEN(m_auth) = chunk_len;
13794         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13795         if (auth_ret != NULL)
13796                 *auth_ret = auth;
13797
13798         return (m);
13799 }
13800
13801 #ifdef INET6
13802 int
13803 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13804 {
13805         struct nd_prefix *pfx = NULL;
13806         struct nd_pfxrouter *pfxrtr = NULL;
13807         struct sockaddr_in6 gw6;
13808
13809         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13810                 return (0);
13811
13812         /* get prefix entry of address */
13813         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13814                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13815                         continue;
13816                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13817                     &src6->sin6_addr, &pfx->ndpr_mask))
13818                         break;
13819         }
13820         /* no prefix entry in the prefix list */
13821         if (pfx == NULL) {
13822                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13823                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13824                 return (0);
13825         }
13826         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13827         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13828
13829         /* search installed gateway from prefix entry */
13830         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13831                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13832                 gw6.sin6_family = AF_INET6;
13833                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13834                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13835                     sizeof(struct in6_addr));
13836                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13837                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13838                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13839                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13840                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13841                     ro->ro_rt->rt_gateway)) {
13842                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13843                         return (1);
13844                 }
13845         }
13846         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13847         return (0);
13848 }
13849
13850 #endif
13851
13852 int
13853 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13854 {
13855 #ifdef INET
13856         struct sockaddr_in *sin, *mask;
13857         struct ifaddr *ifa;
13858         struct in_addr srcnetaddr, gwnetaddr;
13859
13860         if (ro == NULL || ro->ro_rt == NULL ||
13861             sifa->address.sa.sa_family != AF_INET) {
13862                 return (0);
13863         }
13864         ifa = (struct ifaddr *)sifa->ifa;
13865         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13866         sin = &sifa->address.sin;
13867         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13868         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13869         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13870         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13871
13872         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13873         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13874         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13875         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13876         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13877         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13878                 return (1);
13879         }
13880 #endif
13881         return (0);
13882 }