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 prefered -- skipping to next\n");
3075                         continue;
3076                 }
3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3080
3081                 /*
3082                  * Ok we have num_eligible_addr set with how many we can
3083                  * use, this may vary from call to call due to addresses
3084                  * being deprecated etc..
3085                  */
3086                 if (cur_addr_num >= num_preferred) {
3087                         cur_addr_num = 0;
3088                 }
3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3090                     dest_is_priv, cur_addr_num, fam, ro);
3091                 if (sifa == NULL)
3092                         continue;
3093                 if (net) {
3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3096                             cur_addr_num);
3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3101                 }
3102                 atomic_add_int(&sifa->refcount, 1);
3103                 return (sifa);
3104         }
3105 #ifdef INET
3106 again_with_private_addresses_allowed:
3107 #endif
3108         /* plan_c: do we have an acceptable address on the emit interface */
3109         sifa = NULL;
3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3111         if (emit_ifn == NULL) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3113                 goto plan_d;
3114         }
3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3117 #ifdef INET
3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3122                         continue;
3123                 }
3124 #endif
3125 #ifdef INET6
3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3130                         continue;
3131                 }
3132 #endif
3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3134                     (non_asoc_addr_ok == 0)) {
3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3136                         continue;
3137                 }
3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3139                     dest_is_priv, fam);
3140                 if (sifa == NULL) {
3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3142                         continue;
3143                 }
3144                 if (stcb) {
3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3147                                 sifa = NULL;
3148                                 continue;
3149                         }
3150                         if (((non_asoc_addr_ok == 0) &&
3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
3152                             (non_asoc_addr_ok &&
3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
3155                                 /*
3156                                  * It is restricted for some reason..
3157                                  * probably not yet added.
3158                                  */
3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3160                                 sifa = NULL;
3161                                 continue;
3162                         }
3163                 }
3164                 atomic_add_int(&sifa->refcount, 1);
3165                 goto out;
3166         }
3167 plan_d:
3168         /*
3169          * plan_d: We are in trouble. No preferred address on the emit
3170          * interface. And not even a preferred address on all interfaces. Go
3171          * out and see if we can find an acceptable address somewhere
3172          * amongst all interfaces.
3173          */
3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177                         /* wrong base scope */
3178                         continue;
3179                 }
3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181 #ifdef INET
3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3185                                 continue;
3186                         }
3187 #endif
3188 #ifdef INET6
3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192                                 continue;
3193                         }
3194 #endif
3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196                             (non_asoc_addr_ok == 0))
3197                                 continue;
3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199                             dest_is_loop,
3200                             dest_is_priv, fam);
3201                         if (sifa == NULL)
3202                                 continue;
3203                         if (stcb) {
3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205                                         sifa = NULL;
3206                                         continue;
3207                                 }
3208                                 if (((non_asoc_addr_ok == 0) &&
3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3210                                     (non_asoc_addr_ok &&
3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3213                                         /*
3214                                          * It is restricted for some
3215                                          * reason.. probably not yet added.
3216                                          */
3217                                         sifa = NULL;
3218                                         continue;
3219                                 }
3220                         }
3221                         goto out;
3222                 }
3223         }
3224 #ifdef INET
3225         if (stcb) {
3226                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3227                         stcb->asoc.scope.ipv4_local_scope = 1;
3228                         retried = 1;
3229                         goto again_with_private_addresses_allowed;
3230                 } else if (retried == 1) {
3231                         stcb->asoc.scope.ipv4_local_scope = 0;
3232                 }
3233         }
3234 #endif
3235 out:
3236 #ifdef INET
3237         if (sifa) {
3238                 if (retried == 1) {
3239                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3240                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3241                                         /* wrong base scope */
3242                                         continue;
3243                                 }
3244                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3245                                         struct sctp_ifa *tmp_sifa;
3246
3247 #ifdef INET
3248                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3249                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3250                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3251                                                 continue;
3252                                         }
3253 #endif
3254 #ifdef INET6
3255                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3256                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3257                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3258                                                 continue;
3259                                         }
3260 #endif
3261                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3262                                             (non_asoc_addr_ok == 0))
3263                                                 continue;
3264                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3265                                             dest_is_loop,
3266                                             dest_is_priv, fam);
3267                                         if (tmp_sifa == NULL) {
3268                                                 continue;
3269                                         }
3270                                         if (tmp_sifa == sifa) {
3271                                                 continue;
3272                                         }
3273                                         if (stcb) {
3274                                                 if (sctp_is_address_in_scope(tmp_sifa,
3275                                                     &stcb->asoc.scope, 0) == 0) {
3276                                                         continue;
3277                                                 }
3278                                                 if (((non_asoc_addr_ok == 0) &&
3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3280                                                     (non_asoc_addr_ok &&
3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3282                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3283                                                         /*
3284                                                          * It is restricted
3285                                                          * for some reason..
3286                                                          * probably not yet
3287                                                          * added.
3288                                                          */
3289                                                         continue;
3290                                                 }
3291                                         }
3292                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3293                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3294                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3295                                         }
3296                                 }
3297                         }
3298                 }
3299                 atomic_add_int(&sifa->refcount, 1);
3300         }
3301 #endif
3302         return (sifa);
3303 }
3304
3305
3306
3307 /* tcb may be NULL */
3308 struct sctp_ifa *
3309 sctp_source_address_selection(struct sctp_inpcb *inp,
3310     struct sctp_tcb *stcb,
3311     sctp_route_t * ro,
3312     struct sctp_nets *net,
3313     int non_asoc_addr_ok, uint32_t vrf_id)
3314 {
3315         struct sctp_ifa *answer;
3316         uint8_t dest_is_priv, dest_is_loop;
3317         sa_family_t fam;
3318
3319 #ifdef INET
3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3321
3322 #endif
3323 #ifdef INET6
3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325
3326 #endif
3327
3328         /**
3329          * Rules:
3330          * - Find the route if needed, cache if I can.
3331          * - Look at interface address in route, Is it in the bound list. If so we
3332          *   have the best source.
3333          * - If not we must rotate amongst the addresses.
3334          *
3335          * Cavets and issues
3336          *
3337          * Do we need to pay attention to scope. We can have a private address
3338          * or a global address we are sourcing or sending to. So if we draw
3339          * it out
3340          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3341          * For V4
3342          * ------------------------------------------
3343          *      source     *      dest  *  result
3344          * -----------------------------------------
3345          * <a>  Private    *    Global  *  NAT
3346          * -----------------------------------------
3347          * <b>  Private    *    Private *  No problem
3348          * -----------------------------------------
3349          * <c>  Global     *    Private *  Huh, How will this work?
3350          * -----------------------------------------
3351          * <d>  Global     *    Global  *  No Problem
3352          *------------------------------------------
3353          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3354          * For V6
3355          *------------------------------------------
3356          *      source     *      dest  *  result
3357          * -----------------------------------------
3358          * <a>  Linklocal  *    Global  *
3359          * -----------------------------------------
3360          * <b>  Linklocal  * Linklocal  *  No problem
3361          * -----------------------------------------
3362          * <c>  Global     * Linklocal  *  Huh, How will this work?
3363          * -----------------------------------------
3364          * <d>  Global     *    Global  *  No Problem
3365          *------------------------------------------
3366          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3367          *
3368          * And then we add to that what happens if there are multiple addresses
3369          * assigned to an interface. Remember the ifa on a ifn is a linked
3370          * list of addresses. So one interface can have more than one IP
3371          * address. What happens if we have both a private and a global
3372          * address? Do we then use context of destination to sort out which
3373          * one is best? And what about NAT's sending P->G may get you a NAT
3374          * translation, or should you select the G thats on the interface in
3375          * preference.
3376          *
3377          * Decisions:
3378          *
3379          * - count the number of addresses on the interface.
3380          * - if it is one, no problem except case <c>.
3381          *   For <a> we will assume a NAT out there.
3382          * - if there are more than one, then we need to worry about scope P
3383          *   or G. We should prefer G -> G and P -> P if possible.
3384          *   Then as a secondary fall back to mixed types G->P being a last
3385          *   ditch one.
3386          * - The above all works for bound all, but bound specific we need to
3387          *   use the same concept but instead only consider the bound
3388          *   addresses. If the bound set is NOT assigned to the interface then
3389          *   we must use rotation amongst the bound addresses..
3390          */
3391         if (ro->ro_rt == NULL) {
3392                 /*
3393                  * Need a route to cache.
3394                  */
3395                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3396         }
3397         if (ro->ro_rt == NULL) {
3398                 return (NULL);
3399         }
3400         fam = ro->ro_dst.sa_family;
3401         dest_is_priv = dest_is_loop = 0;
3402         /* Setup our scopes for the destination */
3403         switch (fam) {
3404 #ifdef INET
3405         case AF_INET:
3406                 /* Scope based on outbound address */
3407                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3408                         dest_is_loop = 1;
3409                         if (net != NULL) {
3410                                 /* mark it as local */
3411                                 net->addr_is_local = 1;
3412                         }
3413                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3414                         dest_is_priv = 1;
3415                 }
3416                 break;
3417 #endif
3418 #ifdef INET6
3419         case AF_INET6:
3420                 /* Scope based on outbound address */
3421                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3422                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3423                         /*
3424                          * If the address is a loopback address, which
3425                          * consists of "::1" OR "fe80::1%lo0", we are
3426                          * loopback scope. But we don't use dest_is_priv
3427                          * (link local addresses).
3428                          */
3429                         dest_is_loop = 1;
3430                         if (net != NULL) {
3431                                 /* mark it as local */
3432                                 net->addr_is_local = 1;
3433                         }
3434                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3435                         dest_is_priv = 1;
3436                 }
3437                 break;
3438 #endif
3439         }
3440         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3441         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3442         SCTP_IPI_ADDR_RLOCK();
3443         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3444                 /*
3445                  * Bound all case
3446                  */
3447                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3448                     dest_is_priv, dest_is_loop,
3449                     non_asoc_addr_ok, fam);
3450                 SCTP_IPI_ADDR_RUNLOCK();
3451                 return (answer);
3452         }
3453         /*
3454          * Subset bound case
3455          */
3456         if (stcb) {
3457                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3458                     vrf_id, dest_is_priv,
3459                     dest_is_loop,
3460                     non_asoc_addr_ok, fam);
3461         } else {
3462                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3463                     non_asoc_addr_ok,
3464                     dest_is_priv,
3465                     dest_is_loop, fam);
3466         }
3467         SCTP_IPI_ADDR_RUNLOCK();
3468         return (answer);
3469 }
3470
3471 static int
3472 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3473 {
3474         struct cmsghdr cmh;
3475         int tlen, at, found;
3476         struct sctp_sndinfo sndinfo;
3477         struct sctp_prinfo prinfo;
3478         struct sctp_authinfo authinfo;
3479
3480         tlen = SCTP_BUF_LEN(control);
3481         at = 0;
3482         found = 0;
3483         /*
3484          * Independent of how many mbufs, find the c_type inside the control
3485          * structure and copy out the data.
3486          */
3487         while (at < tlen) {
3488                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3489                         /* There is not enough room for one more. */
3490                         return (found);
3491                 }
3492                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494                         /* We dont't have a complete CMSG header. */
3495                         return (found);
3496                 }
3497                 if (((int)cmh.cmsg_len + at) > tlen) {
3498                         /* We don't have the complete CMSG. */
3499                         return (found);
3500                 }
3501                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3502                     ((c_type == cmh.cmsg_type) ||
3503                     ((c_type == SCTP_SNDRCV) &&
3504                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3505                     (cmh.cmsg_type == SCTP_PRINFO) ||
3506                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3507                         if (c_type == cmh.cmsg_type) {
3508                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3509                                         return (found);
3510                                 }
3511                                 /* It is exactly what we want. Copy it out. */
3512                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3513                                 return (1);
3514                         } else {
3515                                 struct sctp_sndrcvinfo *sndrcvinfo;
3516
3517                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3518                                 if (found == 0) {
3519                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3520                                                 return (found);
3521                                         }
3522                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3523                                 }
3524                                 switch (cmh.cmsg_type) {
3525                                 case SCTP_SNDINFO:
3526                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3527                                                 return (found);
3528                                         }
3529                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3530                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3531                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3532                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3533                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3534                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3535                                         break;
3536                                 case SCTP_PRINFO:
3537                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3538                                                 return (found);
3539                                         }
3540                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3541                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3542                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3543                                         } else {
3544                                                 sndrcvinfo->sinfo_timetolive = 0;
3545                                         }
3546                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3547                                         break;
3548                                 case SCTP_AUTHINFO:
3549                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3550                                                 return (found);
3551                                         }
3552                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3553                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3554                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3555                                         break;
3556                                 default:
3557                                         return (found);
3558                                 }
3559                                 found = 1;
3560                         }
3561                 }
3562                 at += CMSG_ALIGN(cmh.cmsg_len);
3563         }
3564         return (found);
3565 }
3566
3567 static int
3568 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3569 {
3570         struct cmsghdr cmh;
3571         int tlen, at;
3572         struct sctp_initmsg initmsg;
3573
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576
3577 #endif
3578 #ifdef INET6
3579         struct sockaddr_in6 sin6;
3580
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (1);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (1);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (1);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604                         case SCTP_INIT:
3605                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3606                                         *error = EINVAL;
3607                                         return (1);
3608                                 }
3609                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3610                                 if (initmsg.sinit_max_attempts)
3611                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3612                                 if (initmsg.sinit_num_ostreams)
3613                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3614                                 if (initmsg.sinit_max_instreams)
3615                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3616                                 if (initmsg.sinit_max_init_timeo)
3617                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3618                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3619                                         struct sctp_stream_out *tmp_str;
3620                                         unsigned int i;
3621
3622 #if defined(SCTP_DETAILED_STR_STATS)
3623                                         int j;
3624
3625 #endif
3626
3627                                         /* Default is NOT correct */
3628                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3629                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3630                                         SCTP_TCB_UNLOCK(stcb);
3631                                         SCTP_MALLOC(tmp_str,
3632                                             struct sctp_stream_out *,
3633                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3634                                             SCTP_M_STRMO);
3635                                         SCTP_TCB_LOCK(stcb);
3636                                         if (tmp_str != NULL) {
3637                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3638                                                 stcb->asoc.strmout = tmp_str;
3639                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3640                                         } else {
3641                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3642                                         }
3643                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3644                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3645                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3646                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3647 #if defined(SCTP_DETAILED_STR_STATS)
3648                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3649                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3650                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3651                                                 }
3652 #else
3653                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3654                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3655 #endif
3656                                                 stcb->asoc.strmout[i].stream_no = i;
3657                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3658                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3659                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3660                                         }
3661                                 }
3662                                 break;
3663 #ifdef INET
3664                         case SCTP_DSTADDRV4:
3665                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3670                                 sin.sin_family = AF_INET;
3671                                 sin.sin_len = sizeof(struct sockaddr_in);
3672                                 sin.sin_port = stcb->rport;
3673                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3674                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3675                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3676                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3677                                         *error = EINVAL;
3678                                         return (1);
3679                                 }
3680                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3681                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3682                                         *error = ENOBUFS;
3683                                         return (1);
3684                                 }
3685                                 break;
3686 #endif
3687 #ifdef INET6
3688                         case SCTP_DSTADDRV6:
3689                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3690                                         *error = EINVAL;
3691                                         return (1);
3692                                 }
3693                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3694                                 sin6.sin6_family = AF_INET6;
3695                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3696                                 sin6.sin6_port = stcb->rport;
3697                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3698                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3699                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3700                                         *error = EINVAL;
3701                                         return (1);
3702                                 }
3703 #ifdef INET
3704                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3705                                         in6_sin6_2_sin(&sin, &sin6);
3706                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3707                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3708                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3709                                                 *error = EINVAL;
3710                                                 return (1);
3711                                         }
3712                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3713                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3714                                                 *error = ENOBUFS;
3715                                                 return (1);
3716                                         }
3717                                 } else
3718 #endif
3719                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3720                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3721                                         *error = ENOBUFS;
3722                                         return (1);
3723                                 }
3724                                 break;
3725 #endif
3726                         default:
3727                                 break;
3728                         }
3729                 }
3730                 at += CMSG_ALIGN(cmh.cmsg_len);
3731         }
3732         return (0);
3733 }
3734
3735 static struct sctp_tcb *
3736 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3737     uint16_t port,
3738     struct mbuf *control,
3739     struct sctp_nets **net_p,
3740     int *error)
3741 {
3742         struct cmsghdr cmh;
3743         int tlen, at;
3744         struct sctp_tcb *stcb;
3745         struct sockaddr *addr;
3746
3747 #ifdef INET
3748         struct sockaddr_in sin;
3749
3750 #endif
3751 #ifdef INET6
3752         struct sockaddr_in6 sin6;
3753
3754 #endif
3755
3756         tlen = SCTP_BUF_LEN(control);
3757         at = 0;
3758         while (at < tlen) {
3759                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3760                         /* There is not enough room for one more. */
3761                         *error = EINVAL;
3762                         return (NULL);
3763                 }
3764                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3765                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3766                         /* We dont't have a complete CMSG header. */
3767                         *error = EINVAL;
3768                         return (NULL);
3769                 }
3770                 if (((int)cmh.cmsg_len + at) > tlen) {
3771                         /* We don't have the complete CMSG. */
3772                         *error = EINVAL;
3773                         return (NULL);
3774                 }
3775                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3776                         switch (cmh.cmsg_type) {
3777 #ifdef INET
3778                         case SCTP_DSTADDRV4:
3779                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3784                                 sin.sin_family = AF_INET;
3785                                 sin.sin_len = sizeof(struct sockaddr_in);
3786                                 sin.sin_port = port;
3787                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3788                                 addr = (struct sockaddr *)&sin;
3789                                 break;
3790 #endif
3791 #ifdef INET6
3792                         case SCTP_DSTADDRV6:
3793                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3794                                         *error = EINVAL;
3795                                         return (NULL);
3796                                 }
3797                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3798                                 sin6.sin6_family = AF_INET6;
3799                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3800                                 sin6.sin6_port = port;
3801                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3802 #ifdef INET
3803                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3804                                         in6_sin6_2_sin(&sin, &sin6);
3805                                         addr = (struct sockaddr *)&sin;
3806                                 } else
3807 #endif
3808                                         addr = (struct sockaddr *)&sin6;
3809                                 break;
3810 #endif
3811                         default:
3812                                 addr = NULL;
3813                                 break;
3814                         }
3815                         if (addr) {
3816                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3817                                 if (stcb != NULL) {
3818                                         return (stcb);
3819                                 }
3820                         }
3821                 }
3822                 at += CMSG_ALIGN(cmh.cmsg_len);
3823         }
3824         return (NULL);
3825 }
3826
3827 static struct mbuf *
3828 sctp_add_cookie(struct mbuf *init, int init_offset,
3829     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3830 {
3831         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3832         struct sctp_state_cookie *stc;
3833         struct sctp_paramhdr *ph;
3834         uint8_t *foo;
3835         int sig_offset;
3836         uint16_t cookie_sz;
3837
3838         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3839             sizeof(struct sctp_paramhdr)), 0,
3840             M_NOWAIT, 1, MT_DATA);
3841         if (mret == NULL) {
3842                 return (NULL);
3843         }
3844         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3845         if (copy_init == NULL) {
3846                 sctp_m_freem(mret);
3847                 return (NULL);
3848         }
3849 #ifdef SCTP_MBUF_LOGGING
3850         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3851                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3852         }
3853 #endif
3854         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3855             M_NOWAIT);
3856         if (copy_initack == NULL) {
3857                 sctp_m_freem(mret);
3858                 sctp_m_freem(copy_init);
3859                 return (NULL);
3860         }
3861 #ifdef SCTP_MBUF_LOGGING
3862         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3863                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3864         }
3865 #endif
3866         /* easy side we just drop it on the end */
3867         ph = mtod(mret, struct sctp_paramhdr *);
3868         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3869             sizeof(struct sctp_paramhdr);
3870         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3871             sizeof(struct sctp_paramhdr));
3872         ph->param_type = htons(SCTP_STATE_COOKIE);
3873         ph->param_length = 0;   /* fill in at the end */
3874         /* Fill in the stc cookie data */
3875         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3876
3877         /* tack the INIT and then the INIT-ACK onto the chain */
3878         cookie_sz = 0;
3879         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880                 cookie_sz += SCTP_BUF_LEN(m_at);
3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3882                         SCTP_BUF_NEXT(m_at) = copy_init;
3883                         break;
3884                 }
3885         }
3886         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3887                 cookie_sz += SCTP_BUF_LEN(m_at);
3888                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3889                         SCTP_BUF_NEXT(m_at) = copy_initack;
3890                         break;
3891                 }
3892         }
3893         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3894                 cookie_sz += SCTP_BUF_LEN(m_at);
3895                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3896                         break;
3897                 }
3898         }
3899         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3900         if (sig == NULL) {
3901                 /* no space, so free the entire chain */
3902                 sctp_m_freem(mret);
3903                 return (NULL);
3904         }
3905         SCTP_BUF_LEN(sig) = 0;
3906         SCTP_BUF_NEXT(m_at) = sig;
3907         sig_offset = 0;
3908         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3909         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3910         *signature = foo;
3911         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3912         cookie_sz += SCTP_SIGNATURE_SIZE;
3913         ph->param_length = htons(cookie_sz);
3914         return (mret);
3915 }
3916
3917
3918 static uint8_t
3919 sctp_get_ect(struct sctp_tcb *stcb)
3920 {
3921         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3922                 return (SCTP_ECT0_BIT);
3923         } else {
3924                 return (0);
3925         }
3926 }
3927
3928 #if defined(INET) || defined(INET6)
3929 static void
3930 sctp_handle_no_route(struct sctp_tcb *stcb,
3931     struct sctp_nets *net,
3932     int so_locked)
3933 {
3934         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3935
3936         if (net) {
3937                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3938                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3939                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3940                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3941                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3942                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3943                                     stcb, 0,
3944                                     (void *)net,
3945                                     so_locked);
3946                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3947                                 net->dest_state &= ~SCTP_ADDR_PF;
3948                         }
3949                 }
3950                 if (stcb) {
3951                         if (net == stcb->asoc.primary_destination) {
3952                                 /* need a new primary */
3953                                 struct sctp_nets *alt;
3954
3955                                 alt = sctp_find_alternate_net(stcb, net, 0);
3956                                 if (alt != net) {
3957                                         if (stcb->asoc.alternate) {
3958                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3959                                         }
3960                                         stcb->asoc.alternate = alt;
3961                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3962                                         if (net->ro._s_addr) {
3963                                                 sctp_free_ifa(net->ro._s_addr);
3964                                                 net->ro._s_addr = NULL;
3965                                         }
3966                                         net->src_addr_selected = 0;
3967                                 }
3968                         }
3969                 }
3970         }
3971 }
3972
3973 #endif
3974
3975 static int
3976 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3977     struct sctp_tcb *stcb,      /* may be NULL */
3978     struct sctp_nets *net,
3979     struct sockaddr *to,
3980     struct mbuf *m,
3981     uint32_t auth_offset,
3982     struct sctp_auth_chunk *auth,
3983     uint16_t auth_keyid,
3984     int nofragment_flag,
3985     int ecn_ok,
3986     int out_of_asoc_ok,
3987     uint16_t src_port,
3988     uint16_t dest_port,
3989     uint32_t v_tag,
3990     uint16_t port,
3991     union sctp_sockstore *over_addr,
3992     uint8_t mflowtype, uint32_t mflowid,
3993 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3994     int so_locked SCTP_UNUSED
3995 #else
3996     int so_locked
3997 #endif
3998 )
3999 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4000 {
4001         /**
4002          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4003          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4004          * - fill in the HMAC digest of any AUTH chunk in the packet.
4005          * - calculate and fill in the SCTP checksum.
4006          * - prepend an IP address header.
4007          * - if boundall use INADDR_ANY.
4008          * - if boundspecific do source address selection.
4009          * - set fragmentation option for ipV4.
4010          * - On return from IP output, check/adjust mtu size of output
4011          *   interface and smallest_mtu size as well.
4012          */
4013         /* Will need ifdefs around this */
4014         struct mbuf *newm;
4015         struct sctphdr *sctphdr;
4016         int packet_length;
4017         int ret;
4018
4019 #if defined(INET) || defined(INET6)
4020         uint32_t vrf_id;
4021
4022 #endif
4023 #if defined(INET) || defined(INET6)
4024         struct mbuf *o_pak;
4025         sctp_route_t *ro = NULL;
4026         struct udphdr *udp = NULL;
4027
4028 #endif
4029         uint8_t tos_value;
4030
4031 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4032         struct socket *so = NULL;
4033
4034 #endif
4035
4036         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4037                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4038                 sctp_m_freem(m);
4039                 return (EFAULT);
4040         }
4041 #if defined(INET) || defined(INET6)
4042         if (stcb) {
4043                 vrf_id = stcb->asoc.vrf_id;
4044         } else {
4045                 vrf_id = inp->def_vrf_id;
4046         }
4047 #endif
4048         /* fill in the HMAC digest for any AUTH chunk in the packet */
4049         if ((auth != NULL) && (stcb != NULL)) {
4050                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4051         }
4052         if (net) {
4053                 tos_value = net->dscp;
4054         } else if (stcb) {
4055                 tos_value = stcb->asoc.default_dscp;
4056         } else {
4057                 tos_value = inp->sctp_ep.default_dscp;
4058         }
4059
4060         switch (to->sa_family) {
4061 #ifdef INET
4062         case AF_INET:
4063                 {
4064                         struct ip *ip = NULL;
4065                         sctp_route_t iproute;
4066                         int len;
4067
4068                         len = SCTP_MIN_V4_OVERHEAD;
4069                         if (port) {
4070                                 len += sizeof(struct udphdr);
4071                         }
4072                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4073                         if (newm == NULL) {
4074                                 sctp_m_freem(m);
4075                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4076                                 return (ENOMEM);
4077                         }
4078                         SCTP_ALIGN_TO_END(newm, len);
4079                         SCTP_BUF_LEN(newm) = len;
4080                         SCTP_BUF_NEXT(newm) = m;
4081                         m = newm;
4082                         if (net != NULL) {
4083                                 m->m_pkthdr.flowid = net->flowid;
4084                                 M_HASHTYPE_SET(m, net->flowtype);
4085                         } else {
4086                                 m->m_pkthdr.flowid = mflowid;
4087                                 M_HASHTYPE_SET(m, mflowtype);
4088                         }
4089                         packet_length = sctp_calculate_len(m);
4090                         ip = mtod(m, struct ip *);
4091                         ip->ip_v = IPVERSION;
4092                         ip->ip_hl = (sizeof(struct ip) >> 2);
4093                         if (tos_value == 0) {
4094                                 /*
4095                                  * This means especially, that it is not set
4096                                  * at the SCTP layer. So use the value from
4097                                  * the IP layer.
4098                                  */
4099                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4100                         }
4101                         tos_value &= 0xfc;
4102                         if (ecn_ok) {
4103                                 tos_value |= sctp_get_ect(stcb);
4104                         }
4105                         if ((nofragment_flag) && (port == 0)) {
4106                                 ip->ip_off = htons(IP_DF);
4107                         } else {
4108                                 ip->ip_off = htons(0);
4109                         }
4110                         /* FreeBSD has a function for ip_id's */
4111                         ip_fillid(ip);
4112
4113                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4114                         ip->ip_len = htons(packet_length);
4115                         ip->ip_tos = tos_value;
4116                         if (port) {
4117                                 ip->ip_p = IPPROTO_UDP;
4118                         } else {
4119                                 ip->ip_p = IPPROTO_SCTP;
4120                         }
4121                         ip->ip_sum = 0;
4122                         if (net == NULL) {
4123                                 ro = &iproute;
4124                                 memset(&iproute, 0, sizeof(iproute));
4125                                 memcpy(&ro->ro_dst, to, to->sa_len);
4126                         } else {
4127                                 ro = (sctp_route_t *) & net->ro;
4128                         }
4129                         /* Now the address selection part */
4130                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4131
4132                         /* call the routine to select the src address */
4133                         if (net && out_of_asoc_ok == 0) {
4134                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4135                                         sctp_free_ifa(net->ro._s_addr);
4136                                         net->ro._s_addr = NULL;
4137                                         net->src_addr_selected = 0;
4138                                         if (ro->ro_rt) {
4139                                                 RTFREE(ro->ro_rt);
4140                                                 ro->ro_rt = NULL;
4141                                         }
4142                                 }
4143                                 if (net->src_addr_selected == 0) {
4144                                         /* Cache the source address */
4145                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4146                                             ro, net, 0,
4147                                             vrf_id);
4148                                         net->src_addr_selected = 1;
4149                                 }
4150                                 if (net->ro._s_addr == NULL) {
4151                                         /* No route to host */
4152                                         net->src_addr_selected = 0;
4153                                         sctp_handle_no_route(stcb, net, so_locked);
4154                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4155                                         sctp_m_freem(m);
4156                                         return (EHOSTUNREACH);
4157                                 }
4158                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4159                         } else {
4160                                 if (over_addr == NULL) {
4161                                         struct sctp_ifa *_lsrc;
4162
4163                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4164                                             net,
4165                                             out_of_asoc_ok,
4166                                             vrf_id);
4167                                         if (_lsrc == NULL) {
4168                                                 sctp_handle_no_route(stcb, net, so_locked);
4169                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4170                                                 sctp_m_freem(m);
4171                                                 return (EHOSTUNREACH);
4172                                         }
4173                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4174                                         sctp_free_ifa(_lsrc);
4175                                 } else {
4176                                         ip->ip_src = over_addr->sin.sin_addr;
4177                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4178                                 }
4179                         }
4180                         if (port) {
4181                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4182                                         sctp_handle_no_route(stcb, net, so_locked);
4183                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4184                                         sctp_m_freem(m);
4185                                         return (EHOSTUNREACH);
4186                                 }
4187                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4188                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4189                                 udp->uh_dport = port;
4190                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip)));
4191                                 if (V_udp_cksum) {
4192                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4193                                 } else {
4194                                         udp->uh_sum = 0;
4195                                 }
4196                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4197                         } else {
4198                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4199                         }
4200
4201                         sctphdr->src_port = src_port;
4202                         sctphdr->dest_port = dest_port;
4203                         sctphdr->v_tag = v_tag;
4204                         sctphdr->checksum = 0;
4205
4206                         /*
4207                          * If source address selection fails and we find no
4208                          * route then the ip_output should fail as well with
4209                          * a NO_ROUTE_TO_HOST type error. We probably should
4210                          * catch that somewhere and abort the association
4211                          * right away (assuming this is an INIT being sent).
4212                          */
4213                         if (ro->ro_rt == NULL) {
4214                                 /*
4215                                  * src addr selection failed to find a route
4216                                  * (or valid source addr), so we can't get
4217                                  * there from here (yet)!
4218                                  */
4219                                 sctp_handle_no_route(stcb, net, so_locked);
4220                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4221                                 sctp_m_freem(m);
4222                                 return (EHOSTUNREACH);
4223                         }
4224                         if (ro != &iproute) {
4225                                 memcpy(&iproute, ro, sizeof(*ro));
4226                         }
4227                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4228                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4229                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4230                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4231                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4232                             (void *)ro->ro_rt);
4233
4234                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4235                                 /* failed to prepend data, give up */
4236                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4237                                 sctp_m_freem(m);
4238                                 return (ENOMEM);
4239                         }
4240                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4241                         if (port) {
4242 #if defined(SCTP_WITH_NO_CSUM)
4243                                 SCTP_STAT_INCR(sctps_sendnocrc);
4244 #else
4245                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4246                                 SCTP_STAT_INCR(sctps_sendswcrc);
4247 #endif
4248                                 if (V_udp_cksum) {
4249                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4250                                 }
4251                         } else {
4252 #if defined(SCTP_WITH_NO_CSUM)
4253                                 SCTP_STAT_INCR(sctps_sendnocrc);
4254 #else
4255                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4256                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4257                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4258 #endif
4259                         }
4260 #ifdef SCTP_PACKET_LOGGING
4261                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4262                                 sctp_packet_log(o_pak);
4263 #endif
4264                         /* send it out.  table id is taken from stcb */
4265 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4266                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4267                                 so = SCTP_INP_SO(inp);
4268                                 SCTP_SOCKET_UNLOCK(so, 0);
4269                         }
4270 #endif
4271                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4272 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4273                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4274                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4275                                 SCTP_TCB_UNLOCK(stcb);
4276                                 SCTP_SOCKET_LOCK(so, 0);
4277                                 SCTP_TCB_LOCK(stcb);
4278                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4279                         }
4280 #endif
4281                         SCTP_STAT_INCR(sctps_sendpackets);
4282                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4283                         if (ret)
4284                                 SCTP_STAT_INCR(sctps_senderrors);
4285
4286                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4287                         if (net == NULL) {
4288                                 /* free tempy routes */
4289                                 RO_RTFREE(ro);
4290                         } else {
4291                                 /*
4292                                  * PMTU check versus smallest asoc MTU goes
4293                                  * here
4294                                  */
4295                                 if ((ro->ro_rt != NULL) &&
4296                                     (net->ro._s_addr)) {
4297                                         uint32_t mtu;
4298
4299                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4300                                         if (net->port) {
4301                                                 mtu -= sizeof(struct udphdr);
4302                                         }
4303                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4304                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4305                                                 net->mtu = mtu;
4306                                         }
4307                                 } else if (ro->ro_rt == NULL) {
4308                                         /* route was freed */
4309                                         if (net->ro._s_addr &&
4310                                             net->src_addr_selected) {
4311                                                 sctp_free_ifa(net->ro._s_addr);
4312                                                 net->ro._s_addr = NULL;
4313                                         }
4314                                         net->src_addr_selected = 0;
4315                                 }
4316                         }
4317                         return (ret);
4318                 }
4319 #endif
4320 #ifdef INET6
4321         case AF_INET6:
4322                 {
4323                         uint32_t flowlabel, flowinfo;
4324                         struct ip6_hdr *ip6h;
4325                         struct route_in6 ip6route;
4326                         struct ifnet *ifp;
4327                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4328                         int prev_scope = 0;
4329                         struct sockaddr_in6 lsa6_storage;
4330                         int error;
4331                         u_short prev_port = 0;
4332                         int len;
4333
4334                         if (net) {
4335                                 flowlabel = net->flowlabel;
4336                         } else if (stcb) {
4337                                 flowlabel = stcb->asoc.default_flowlabel;
4338                         } else {
4339                                 flowlabel = inp->sctp_ep.default_flowlabel;
4340                         }
4341                         if (flowlabel == 0) {
4342                                 /*
4343                                  * This means especially, that it is not set
4344                                  * at the SCTP layer. So use the value from
4345                                  * the IP layer.
4346                                  */
4347                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4348                         }
4349                         flowlabel &= 0x000fffff;
4350                         len = SCTP_MIN_OVERHEAD;
4351                         if (port) {
4352                                 len += sizeof(struct udphdr);
4353                         }
4354                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4355                         if (newm == NULL) {
4356                                 sctp_m_freem(m);
4357                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4358                                 return (ENOMEM);
4359                         }
4360                         SCTP_ALIGN_TO_END(newm, len);
4361                         SCTP_BUF_LEN(newm) = len;
4362                         SCTP_BUF_NEXT(newm) = m;
4363                         m = newm;
4364                         if (net != NULL) {
4365                                 m->m_pkthdr.flowid = net->flowid;
4366                                 M_HASHTYPE_SET(m, net->flowtype);
4367                         } else {
4368                                 m->m_pkthdr.flowid = mflowid;
4369                                 M_HASHTYPE_SET(m, mflowtype);
4370                         }
4371                         packet_length = sctp_calculate_len(m);
4372
4373                         ip6h = mtod(m, struct ip6_hdr *);
4374                         /* protect *sin6 from overwrite */
4375                         sin6 = (struct sockaddr_in6 *)to;
4376                         tmp = *sin6;
4377                         sin6 = &tmp;
4378
4379                         /* KAME hack: embed scopeid */
4380                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4381                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4382                                 return (EINVAL);
4383                         }
4384                         if (net == NULL) {
4385                                 memset(&ip6route, 0, sizeof(ip6route));
4386                                 ro = (sctp_route_t *) & ip6route;
4387                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4388                         } else {
4389                                 ro = (sctp_route_t *) & net->ro;
4390                         }
4391                         /*
4392                          * We assume here that inp_flow is in host byte
4393                          * order within the TCB!
4394                          */
4395                         if (tos_value == 0) {
4396                                 /*
4397                                  * This means especially, that it is not set
4398                                  * at the SCTP layer. So use the value from
4399                                  * the IP layer.
4400                                  */
4401                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4402                         }
4403                         tos_value &= 0xfc;
4404                         if (ecn_ok) {
4405                                 tos_value |= sctp_get_ect(stcb);
4406                         }
4407                         flowinfo = 0x06;
4408                         flowinfo <<= 8;
4409                         flowinfo |= tos_value;
4410                         flowinfo <<= 20;
4411                         flowinfo |= flowlabel;
4412                         ip6h->ip6_flow = htonl(flowinfo);
4413                         if (port) {
4414                                 ip6h->ip6_nxt = IPPROTO_UDP;
4415                         } else {
4416                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4417                         }
4418                         ip6h->ip6_plen = (uint16_t) (packet_length - sizeof(struct ip6_hdr));
4419                         ip6h->ip6_dst = sin6->sin6_addr;
4420
4421                         /*
4422                          * Add SRC address selection here: we can only reuse
4423                          * to a limited degree the kame src-addr-sel, since
4424                          * we can try their selection but it may not be
4425                          * bound.
4426                          */
4427                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4428                         lsa6_tmp.sin6_family = AF_INET6;
4429                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4430                         lsa6 = &lsa6_tmp;
4431                         if (net && out_of_asoc_ok == 0) {
4432                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4433                                         sctp_free_ifa(net->ro._s_addr);
4434                                         net->ro._s_addr = NULL;
4435                                         net->src_addr_selected = 0;
4436                                         if (ro->ro_rt) {
4437                                                 RTFREE(ro->ro_rt);
4438                                                 ro->ro_rt = NULL;
4439                                         }
4440                                 }
4441                                 if (net->src_addr_selected == 0) {
4442                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4443                                         /* KAME hack: embed scopeid */
4444                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4445                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4446                                                 return (EINVAL);
4447                                         }
4448                                         /* Cache the source address */
4449                                         net->ro._s_addr = sctp_source_address_selection(inp,
4450                                             stcb,
4451                                             ro,
4452                                             net,
4453                                             0,
4454                                             vrf_id);
4455                                         (void)sa6_recoverscope(sin6);
4456                                         net->src_addr_selected = 1;
4457                                 }
4458                                 if (net->ro._s_addr == NULL) {
4459                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4460                                         net->src_addr_selected = 0;
4461                                         sctp_handle_no_route(stcb, net, so_locked);
4462                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4463                                         sctp_m_freem(m);
4464                                         return (EHOSTUNREACH);
4465                                 }
4466                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4467                         } else {
4468                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4469                                 /* KAME hack: embed scopeid */
4470                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4471                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4472                                         return (EINVAL);
4473                                 }
4474                                 if (over_addr == NULL) {
4475                                         struct sctp_ifa *_lsrc;
4476
4477                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4478                                             net,
4479                                             out_of_asoc_ok,
4480                                             vrf_id);
4481                                         if (_lsrc == NULL) {
4482                                                 sctp_handle_no_route(stcb, net, so_locked);
4483                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4484                                                 sctp_m_freem(m);
4485                                                 return (EHOSTUNREACH);
4486                                         }
4487                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4488                                         sctp_free_ifa(_lsrc);
4489                                 } else {
4490                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4491                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4492                                 }
4493                                 (void)sa6_recoverscope(sin6);
4494                         }
4495                         lsa6->sin6_port = inp->sctp_lport;
4496
4497                         if (ro->ro_rt == NULL) {
4498                                 /*
4499                                  * src addr selection failed to find a route
4500                                  * (or valid source addr), so we can't get
4501                                  * there from here!
4502                                  */
4503                                 sctp_handle_no_route(stcb, net, so_locked);
4504                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4505                                 sctp_m_freem(m);
4506                                 return (EHOSTUNREACH);
4507                         }
4508                         /*
4509                          * XXX: sa6 may not have a valid sin6_scope_id in
4510                          * the non-SCOPEDROUTING case.
4511                          */
4512                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4513                         lsa6_storage.sin6_family = AF_INET6;
4514                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4515                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4516                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4517                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4518                                 sctp_m_freem(m);
4519                                 return (error);
4520                         }
4521                         /* XXX */
4522                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4523                         lsa6_storage.sin6_port = inp->sctp_lport;
4524                         lsa6 = &lsa6_storage;
4525                         ip6h->ip6_src = lsa6->sin6_addr;
4526
4527                         if (port) {
4528                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4529                                         sctp_handle_no_route(stcb, net, so_locked);
4530                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4531                                         sctp_m_freem(m);
4532                                         return (EHOSTUNREACH);
4533                                 }
4534                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4535                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4536                                 udp->uh_dport = port;
4537                                 udp->uh_ulen = htons((uint16_t) (packet_length - sizeof(struct ip6_hdr)));
4538                                 udp->uh_sum = 0;
4539                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4540                         } else {
4541                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4542                         }
4543
4544                         sctphdr->src_port = src_port;
4545                         sctphdr->dest_port = dest_port;
4546                         sctphdr->v_tag = v_tag;
4547                         sctphdr->checksum = 0;
4548
4549                         /*
4550                          * We set the hop limit now since there is a good
4551                          * chance that our ro pointer is now filled
4552                          */
4553                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4554                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4555
4556 #ifdef SCTP_DEBUG
4557                         /* Copy to be sure something bad is not happening */
4558                         sin6->sin6_addr = ip6h->ip6_dst;
4559                         lsa6->sin6_addr = ip6h->ip6_src;
4560 #endif
4561
4562                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4563                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4564                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4565                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4566                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4567                         if (net) {
4568                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4569                                 /*
4570                                  * preserve the port and scope for link
4571                                  * local send
4572                                  */
4573                                 prev_scope = sin6->sin6_scope_id;
4574                                 prev_port = sin6->sin6_port;
4575                         }
4576                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4577                                 /* failed to prepend data, give up */
4578                                 sctp_m_freem(m);
4579                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4580                                 return (ENOMEM);
4581                         }
4582                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4583                         if (port) {
4584 #if defined(SCTP_WITH_NO_CSUM)
4585                                 SCTP_STAT_INCR(sctps_sendnocrc);
4586 #else
4587                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4588                                 SCTP_STAT_INCR(sctps_sendswcrc);
4589 #endif
4590                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4591                                         udp->uh_sum = 0xffff;
4592                                 }
4593                         } else {
4594 #if defined(SCTP_WITH_NO_CSUM)
4595                                 SCTP_STAT_INCR(sctps_sendnocrc);
4596 #else
4597                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4598                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4599                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4600 #endif
4601                         }
4602                         /* send it out. table id is taken from stcb */
4603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4604                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4605                                 so = SCTP_INP_SO(inp);
4606                                 SCTP_SOCKET_UNLOCK(so, 0);
4607                         }
4608 #endif
4609 #ifdef SCTP_PACKET_LOGGING
4610                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4611                                 sctp_packet_log(o_pak);
4612 #endif
4613                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4614 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4615                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4616                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4617                                 SCTP_TCB_UNLOCK(stcb);
4618                                 SCTP_SOCKET_LOCK(so, 0);
4619                                 SCTP_TCB_LOCK(stcb);
4620                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4621                         }
4622 #endif
4623                         if (net) {
4624                                 /* for link local this must be done */
4625                                 sin6->sin6_scope_id = prev_scope;
4626                                 sin6->sin6_port = prev_port;
4627                         }
4628                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4629                         SCTP_STAT_INCR(sctps_sendpackets);
4630                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4631                         if (ret) {
4632                                 SCTP_STAT_INCR(sctps_senderrors);
4633                         }
4634                         if (net == NULL) {
4635                                 /* Now if we had a temp route free it */
4636                                 RO_RTFREE(ro);
4637                         } else {
4638                                 /*
4639                                  * PMTU check versus smallest asoc MTU goes
4640                                  * here
4641                                  */
4642                                 if (ro->ro_rt == NULL) {
4643                                         /* Route was freed */
4644                                         if (net->ro._s_addr &&
4645                                             net->src_addr_selected) {
4646                                                 sctp_free_ifa(net->ro._s_addr);
4647                                                 net->ro._s_addr = NULL;
4648                                         }
4649                                         net->src_addr_selected = 0;
4650                                 }
4651                                 if ((ro->ro_rt != NULL) &&
4652                                     (net->ro._s_addr)) {
4653                                         uint32_t mtu;
4654
4655                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4656                                         if (mtu &&
4657                                             (stcb->asoc.smallest_mtu > mtu)) {
4658                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4659                                                 net->mtu = mtu;
4660                                                 if (net->port) {
4661                                                         net->mtu -= sizeof(struct udphdr);
4662                                                 }
4663                                         }
4664                                 } else if (ifp) {
4665                                         if (ND_IFINFO(ifp)->linkmtu &&
4666                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4667                                                 sctp_mtu_size_reset(inp,
4668                                                     &stcb->asoc,
4669                                                     ND_IFINFO(ifp)->linkmtu);
4670                                         }
4671                                 }
4672                         }
4673                         return (ret);
4674                 }
4675 #endif
4676         default:
4677                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4678                     ((struct sockaddr *)to)->sa_family);
4679                 sctp_m_freem(m);
4680                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4681                 return (EFAULT);
4682         }
4683 }
4684
4685
4686 void
4687 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4688 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4689     SCTP_UNUSED
4690 #endif
4691 )
4692 {
4693         struct mbuf *m, *m_last;
4694         struct sctp_nets *net;
4695         struct sctp_init_chunk *init;
4696         struct sctp_supported_addr_param *sup_addr;
4697         struct sctp_adaptation_layer_indication *ali;
4698         struct sctp_supported_chunk_types_param *pr_supported;
4699         struct sctp_paramhdr *ph;
4700         int cnt_inits_to = 0;
4701         int ret;
4702         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4703
4704         /* INIT's always go to the primary (and usually ONLY address) */
4705         net = stcb->asoc.primary_destination;
4706         if (net == NULL) {
4707                 net = TAILQ_FIRST(&stcb->asoc.nets);
4708                 if (net == NULL) {
4709                         /* TSNH */
4710                         return;
4711                 }
4712                 /* we confirm any address we send an INIT to */
4713                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4714                 (void)sctp_set_primary_addr(stcb, NULL, net);
4715         } else {
4716                 /* we confirm any address we send an INIT to */
4717                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4718         }
4719         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4720 #ifdef INET6
4721         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4722                 /*
4723                  * special hook, if we are sending to link local it will not
4724                  * show up in our private address count.
4725                  */
4726                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4727                         cnt_inits_to = 1;
4728         }
4729 #endif
4730         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4731                 /* This case should not happen */
4732                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4733                 return;
4734         }
4735         /* start the INIT timer */
4736         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4737
4738         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4739         if (m == NULL) {
4740                 /* No memory, INIT timer will re-attempt. */
4741                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4742                 return;
4743         }
4744         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4745         padding_len = 0;
4746         /* Now lets put the chunk header in place */
4747         init = mtod(m, struct sctp_init_chunk *);
4748         /* now the chunk header */
4749         init->ch.chunk_type = SCTP_INITIATION;
4750         init->ch.chunk_flags = 0;
4751         /* fill in later from mbuf we build */
4752         init->ch.chunk_length = 0;
4753         /* place in my tag */
4754         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4755         /* set up some of the credits. */
4756         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4757             SCTP_MINIMAL_RWND));
4758         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4759         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4760         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4761
4762         /* Adaptation layer indication parameter */
4763         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4764                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4765                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4766                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4767                 ali->ph.param_length = htons(parameter_len);
4768                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4769                 chunk_len += parameter_len;
4770         }
4771         /* ECN parameter */
4772         if (stcb->asoc.ecn_supported == 1) {
4773                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4774                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4775                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4776                 ph->param_length = htons(parameter_len);
4777                 chunk_len += parameter_len;
4778         }
4779         /* PR-SCTP supported parameter */
4780         if (stcb->asoc.prsctp_supported == 1) {
4781                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4782                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4783                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4784                 ph->param_length = htons(parameter_len);
4785                 chunk_len += parameter_len;
4786         }
4787         /* Add NAT friendly parameter. */
4788         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4789                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4790                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4791                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4792                 ph->param_length = htons(parameter_len);
4793                 chunk_len += parameter_len;
4794         }
4795         /* And now tell the peer which extensions we support */
4796         num_ext = 0;
4797         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4798         if (stcb->asoc.prsctp_supported == 1) {
4799                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4800                 if (stcb->asoc.idata_supported) {
4801                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4802                 }
4803         }
4804         if (stcb->asoc.auth_supported == 1) {
4805                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4806         }
4807         if (stcb->asoc.asconf_supported == 1) {
4808                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4809                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4810         }
4811         if (stcb->asoc.reconfig_supported == 1) {
4812                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4813         }
4814         if (stcb->asoc.idata_supported) {
4815                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4816         }
4817         if (stcb->asoc.nrsack_supported == 1) {
4818                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4819         }
4820         if (stcb->asoc.pktdrop_supported == 1) {
4821                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4822         }
4823         if (num_ext > 0) {
4824                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4825                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4826                 pr_supported->ph.param_length = htons(parameter_len);
4827                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4828                 chunk_len += parameter_len;
4829         }
4830         /* add authentication parameters */
4831         if (stcb->asoc.auth_supported) {
4832                 /* attach RANDOM parameter, if available */
4833                 if (stcb->asoc.authinfo.random != NULL) {
4834                         struct sctp_auth_random *randp;
4835
4836                         if (padding_len > 0) {
4837                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4838                                 chunk_len += padding_len;
4839                                 padding_len = 0;
4840                         }
4841                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4842                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4843                         /* random key already contains the header */
4844                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4845                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4846                         chunk_len += parameter_len;
4847                 }
4848                 /* add HMAC_ALGO parameter */
4849                 if (stcb->asoc.local_hmacs != NULL) {
4850                         struct sctp_auth_hmac_algo *hmacs;
4851
4852                         if (padding_len > 0) {
4853                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4854                                 chunk_len += padding_len;
4855                                 padding_len = 0;
4856                         }
4857                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4858                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4859                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4860                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4861                         hmacs->ph.param_length = htons(parameter_len);
4862                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4863                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4864                         chunk_len += parameter_len;
4865                 }
4866                 /* add CHUNKS parameter */
4867                 if (stcb->asoc.local_auth_chunks != NULL) {
4868                         struct sctp_auth_chunk_list *chunks;
4869
4870                         if (padding_len > 0) {
4871                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4872                                 chunk_len += padding_len;
4873                                 padding_len = 0;
4874                         }
4875                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4876                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4877                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4878                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4879                         chunks->ph.param_length = htons(parameter_len);
4880                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4881                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4882                         chunk_len += parameter_len;
4883                 }
4884         }
4885         /* now any cookie time extensions */
4886         if (stcb->asoc.cookie_preserve_req) {
4887                 struct sctp_cookie_perserve_param *cookie_preserve;
4888
4889                 if (padding_len > 0) {
4890                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891                         chunk_len += padding_len;
4892                         padding_len = 0;
4893                 }
4894                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4895                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4896                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4897                 cookie_preserve->ph.param_length = htons(parameter_len);
4898                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4899                 stcb->asoc.cookie_preserve_req = 0;
4900                 chunk_len += parameter_len;
4901         }
4902         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4903                 uint8_t i;
4904
4905                 if (padding_len > 0) {
4906                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4907                         chunk_len += padding_len;
4908                         padding_len = 0;
4909                 }
4910                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4911                 if (stcb->asoc.scope.ipv4_addr_legal) {
4912                         parameter_len += (uint16_t) sizeof(uint16_t);
4913                 }
4914                 if (stcb->asoc.scope.ipv6_addr_legal) {
4915                         parameter_len += (uint16_t) sizeof(uint16_t);
4916                 }
4917                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4918                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4919                 sup_addr->ph.param_length = htons(parameter_len);
4920                 i = 0;
4921                 if (stcb->asoc.scope.ipv4_addr_legal) {
4922                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4923                 }
4924                 if (stcb->asoc.scope.ipv6_addr_legal) {
4925                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4926                 }
4927                 padding_len = 4 - 2 * i;
4928                 chunk_len += parameter_len;
4929         }
4930         SCTP_BUF_LEN(m) = chunk_len;
4931         /* now the addresses */
4932         /*
4933          * To optimize this we could put the scoping stuff into a structure
4934          * and remove the individual uint8's from the assoc structure. Then
4935          * we could just sifa in the address within the stcb. But for now
4936          * this is a quick hack to get the address stuff teased apart.
4937          */
4938         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4939             m, cnt_inits_to,
4940             &padding_len, &chunk_len);
4941
4942         init->ch.chunk_length = htons(chunk_len);
4943         if (padding_len > 0) {
4944                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4945                         sctp_m_freem(m);
4946                         return;
4947                 }
4948         }
4949         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4950         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4951             (struct sockaddr *)&net->ro._l_addr,
4952             m, 0, NULL, 0, 0, 0, 0,
4953             inp->sctp_lport, stcb->rport, htonl(0),
4954             net->port, NULL,
4955             0, 0,
4956             so_locked);
4957         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4958         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4959         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4960 }
4961
4962 struct mbuf *
4963 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4964     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4965 {
4966         /*
4967          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4968          * being equal to the beginning of the params i.e. (iphlen +
4969          * sizeof(struct sctp_init_msg) parse through the parameters to the
4970          * end of the mbuf verifying that all parameters are known.
4971          *
4972          * For unknown parameters build and return a mbuf with
4973          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4974          * processing this chunk stop, and set *abort_processing to 1.
4975          *
4976          * By having param_offset be pre-set to where parameters begin it is
4977          * hoped that this routine may be reused in the future by new
4978          * features.
4979          */
4980         struct sctp_paramhdr *phdr, params;
4981
4982         struct mbuf *mat, *op_err;
4983         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4984         int at, limit, pad_needed;
4985         uint16_t ptype, plen, padded_size;
4986         int err_at;
4987
4988         *abort_processing = 0;
4989         mat = in_initpkt;
4990         err_at = 0;
4991         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4992         at = param_offset;
4993         op_err = NULL;
4994         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4995         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4996         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4997                 ptype = ntohs(phdr->param_type);
4998                 plen = ntohs(phdr->param_length);
4999                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5000                         /* wacked parameter */
5001                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5002                         goto invalid_size;
5003                 }
5004                 limit -= SCTP_SIZE32(plen);
5005                 /*-
5006                  * All parameters for all chunks that we know/understand are
5007                  * listed here. We process them other places and make
5008                  * appropriate stop actions per the upper bits. However this
5009                  * is the generic routine processor's can call to get back
5010                  * an operr.. to either incorporate (init-ack) or send.
5011                  */
5012                 padded_size = SCTP_SIZE32(plen);
5013                 switch (ptype) {
5014                         /* Param's with variable size */
5015                 case SCTP_HEARTBEAT_INFO:
5016                 case SCTP_STATE_COOKIE:
5017                 case SCTP_UNRECOG_PARAM:
5018                 case SCTP_ERROR_CAUSE_IND:
5019                         /* ok skip fwd */
5020                         at += padded_size;
5021                         break;
5022                         /* Param's with variable size within a range */
5023                 case SCTP_CHUNK_LIST:
5024                 case SCTP_SUPPORTED_CHUNK_EXT:
5025                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5026                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5027                                 goto invalid_size;
5028                         }
5029                         at += padded_size;
5030                         break;
5031                 case SCTP_SUPPORTED_ADDRTYPE:
5032                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5033                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5034                                 goto invalid_size;
5035                         }
5036                         at += padded_size;
5037                         break;
5038                 case SCTP_RANDOM:
5039                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5040                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5041                                 goto invalid_size;
5042                         }
5043                         at += padded_size;
5044                         break;
5045                 case SCTP_SET_PRIM_ADDR:
5046                 case SCTP_DEL_IP_ADDRESS:
5047                 case SCTP_ADD_IP_ADDRESS:
5048                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5049                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5050                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5051                                 goto invalid_size;
5052                         }
5053                         at += padded_size;
5054                         break;
5055                         /* Param's with a fixed size */
5056                 case SCTP_IPV4_ADDRESS:
5057                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5059                                 goto invalid_size;
5060                         }
5061                         at += padded_size;
5062                         break;
5063                 case SCTP_IPV6_ADDRESS:
5064                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5065                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5066                                 goto invalid_size;
5067                         }
5068                         at += padded_size;
5069                         break;
5070                 case SCTP_COOKIE_PRESERVE:
5071                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5073                                 goto invalid_size;
5074                         }
5075                         at += padded_size;
5076                         break;
5077                 case SCTP_HAS_NAT_SUPPORT:
5078                         *nat_friendly = 1;
5079                         /* fall through */
5080                 case SCTP_PRSCTP_SUPPORTED:
5081                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5082                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5083                                 goto invalid_size;
5084                         }
5085                         at += padded_size;
5086                         break;
5087                 case SCTP_ECN_CAPABLE:
5088                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5089                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5090                                 goto invalid_size;
5091                         }
5092                         at += padded_size;
5093                         break;
5094                 case SCTP_ULP_ADAPTATION:
5095                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5096                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5097                                 goto invalid_size;
5098                         }
5099                         at += padded_size;
5100                         break;
5101                 case SCTP_SUCCESS_REPORT:
5102                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5103                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5104                                 goto invalid_size;
5105                         }
5106                         at += padded_size;
5107                         break;
5108                 case SCTP_HOSTNAME_ADDRESS:
5109                         {
5110                                 /* We can NOT handle HOST NAME addresses!! */
5111                                 int l_len;
5112
5113                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5114                                 *abort_processing = 1;
5115                                 if (op_err == NULL) {
5116                                         /* Ok need to try to get a mbuf */
5117 #ifdef INET6
5118                                         l_len = SCTP_MIN_OVERHEAD;
5119 #else
5120                                         l_len = SCTP_MIN_V4_OVERHEAD;
5121 #endif
5122                                         l_len += sizeof(struct sctp_chunkhdr);
5123                                         l_len += plen;
5124                                         l_len += sizeof(struct sctp_paramhdr);
5125                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5126                                         if (op_err) {
5127                                                 SCTP_BUF_LEN(op_err) = 0;
5128                                                 /*
5129                                                  * pre-reserve space for ip
5130                                                  * and sctp header  and
5131                                                  * chunk hdr
5132                                                  */
5133 #ifdef INET6
5134                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5135 #else
5136                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5137 #endif
5138                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5139                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5140                                         }
5141                                 }
5142                                 if (op_err) {
5143                                         /* If we have space */
5144                                         struct sctp_paramhdr s;
5145
5146                                         if (err_at % 4) {
5147                                                 uint32_t cpthis = 0;
5148
5149                                                 pad_needed = 4 - (err_at % 4);
5150                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5151                                                 err_at += pad_needed;
5152                                         }
5153                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5154                                         s.param_length = htons(sizeof(s) + plen);
5155                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5156                                         err_at += sizeof(s);
5157                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5158                                         if (phdr == NULL) {
5159                                                 sctp_m_freem(op_err);
5160                                                 /*
5161                                                  * we are out of memory but
5162                                                  * we still need to have a
5163                                                  * look at what to do (the
5164                                                  * system is in trouble
5165                                                  * though).
5166                                                  */
5167                                                 return (NULL);
5168                                         }
5169                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5170                                 }
5171                                 return (op_err);
5172                                 break;
5173                         }
5174                 default:
5175                         /*
5176                          * we do not recognize the parameter figure out what
5177                          * we do.
5178                          */
5179                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5180                         if ((ptype & 0x4000) == 0x4000) {
5181                                 /* Report bit is set?? */
5182                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5183                                 if (op_err == NULL) {
5184                                         int l_len;
5185
5186                                         /* Ok need to try to get an mbuf */
5187 #ifdef INET6
5188                                         l_len = SCTP_MIN_OVERHEAD;
5189 #else
5190                                         l_len = SCTP_MIN_V4_OVERHEAD;
5191 #endif
5192                                         l_len += sizeof(struct sctp_chunkhdr);
5193                                         l_len += plen;
5194                                         l_len += sizeof(struct sctp_paramhdr);
5195                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5196                                         if (op_err) {
5197                                                 SCTP_BUF_LEN(op_err) = 0;
5198 #ifdef INET6
5199                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5200 #else
5201                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5202 #endif
5203                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5204                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5205                                         }
5206                                 }
5207                                 if (op_err) {
5208                                         /* If we have space */
5209                                         struct sctp_paramhdr s;
5210
5211                                         if (err_at % 4) {
5212                                                 uint32_t cpthis = 0;
5213
5214                                                 pad_needed = 4 - (err_at % 4);
5215                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5216                                                 err_at += pad_needed;
5217                                         }
5218                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5219                                         s.param_length = htons(sizeof(s) + plen);
5220                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5221                                         err_at += sizeof(s);
5222                                         if (plen > sizeof(tempbuf)) {
5223                                                 plen = sizeof(tempbuf);
5224                                         }
5225                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5226                                         if (phdr == NULL) {
5227                                                 sctp_m_freem(op_err);
5228                                                 /*
5229                                                  * we are out of memory but
5230                                                  * we still need to have a
5231                                                  * look at what to do (the
5232                                                  * system is in trouble
5233                                                  * though).
5234                                                  */
5235                                                 op_err = NULL;
5236                                                 goto more_processing;
5237                                         }
5238                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5239                                         err_at += plen;
5240                                 }
5241                         }
5242         more_processing:
5243                         if ((ptype & 0x8000) == 0x0000) {
5244                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5245                                 return (op_err);
5246                         } else {
5247                                 /* skip this chunk and continue processing */
5248                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5249                                 at += SCTP_SIZE32(plen);
5250                         }
5251                         break;
5252
5253                 }
5254                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5255         }
5256         return (op_err);
5257 invalid_size:
5258         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5259         *abort_processing = 1;
5260         if ((op_err == NULL) && phdr) {
5261                 int l_len;
5262
5263 #ifdef INET6
5264                 l_len = SCTP_MIN_OVERHEAD;
5265 #else
5266                 l_len = SCTP_MIN_V4_OVERHEAD;
5267 #endif
5268                 l_len += sizeof(struct sctp_chunkhdr);
5269                 l_len += (2 * sizeof(struct sctp_paramhdr));
5270                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5271                 if (op_err) {
5272                         SCTP_BUF_LEN(op_err) = 0;
5273 #ifdef INET6
5274                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5275 #else
5276                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5277 #endif
5278                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5279                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5280                 }
5281         }
5282         if ((op_err) && phdr) {
5283                 struct sctp_paramhdr s;
5284
5285                 if (err_at % 4) {
5286                         uint32_t cpthis = 0;
5287
5288                         pad_needed = 4 - (err_at % 4);
5289                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5290                         err_at += pad_needed;
5291                 }
5292                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5293                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5294                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5295                 err_at += sizeof(s);
5296                 /* Only copy back the p-hdr that caused the issue */
5297                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5298         }
5299         return (op_err);
5300 }
5301
5302 static int
5303 sctp_are_there_new_addresses(struct sctp_association *asoc,
5304     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5305 {
5306         /*
5307          * Given a INIT packet, look through the packet to verify that there
5308          * are NO new addresses. As we go through the parameters add reports
5309          * of any un-understood parameters that require an error.  Also we
5310          * must return (1) to drop the packet if we see a un-understood
5311          * parameter that tells us to drop the chunk.
5312          */
5313         struct sockaddr *sa_touse;
5314         struct sockaddr *sa;
5315         struct sctp_paramhdr *phdr, params;
5316         uint16_t ptype, plen;
5317         uint8_t fnd;
5318         struct sctp_nets *net;
5319         int check_src;
5320
5321 #ifdef INET
5322         struct sockaddr_in sin4, *sa4;
5323
5324 #endif
5325 #ifdef INET6
5326         struct sockaddr_in6 sin6, *sa6;
5327
5328 #endif
5329
5330 #ifdef INET
5331         memset(&sin4, 0, sizeof(sin4));
5332         sin4.sin_family = AF_INET;
5333         sin4.sin_len = sizeof(sin4);
5334 #endif
5335 #ifdef INET6
5336         memset(&sin6, 0, sizeof(sin6));
5337         sin6.sin6_family = AF_INET6;
5338         sin6.sin6_len = sizeof(sin6);
5339 #endif
5340         /* First what about the src address of the pkt ? */
5341         check_src = 0;
5342         switch (src->sa_family) {
5343 #ifdef INET
5344         case AF_INET:
5345                 if (asoc->scope.ipv4_addr_legal) {
5346                         check_src = 1;
5347                 }
5348                 break;
5349 #endif
5350 #ifdef INET6
5351         case AF_INET6:
5352                 if (asoc->scope.ipv6_addr_legal) {
5353                         check_src = 1;
5354                 }
5355                 break;
5356 #endif
5357         default:
5358                 /* TSNH */
5359                 break;
5360         }
5361         if (check_src) {
5362                 fnd = 0;
5363                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5364                         sa = (struct sockaddr *)&net->ro._l_addr;
5365                         if (sa->sa_family == src->sa_family) {
5366 #ifdef INET
5367                                 if (sa->sa_family == AF_INET) {
5368                                         struct sockaddr_in *src4;
5369
5370                                         sa4 = (struct sockaddr_in *)sa;
5371                                         src4 = (struct sockaddr_in *)src;
5372                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5373                                                 fnd = 1;
5374                                                 break;
5375                                         }
5376                                 }
5377 #endif
5378 #ifdef INET6
5379                                 if (sa->sa_family == AF_INET6) {
5380                                         struct sockaddr_in6 *src6;
5381
5382                                         sa6 = (struct sockaddr_in6 *)sa;
5383                                         src6 = (struct sockaddr_in6 *)src;
5384                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5385                                                 fnd = 1;
5386                                                 break;
5387                                         }
5388                                 }
5389 #endif
5390                         }
5391                 }
5392                 if (fnd == 0) {
5393                         /* New address added! no need to look futher. */
5394                         return (1);
5395                 }
5396         }
5397         /* Ok so far lets munge through the rest of the packet */
5398         offset += sizeof(struct sctp_init_chunk);
5399         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5400         while (phdr) {
5401                 sa_touse = NULL;
5402                 ptype = ntohs(phdr->param_type);
5403                 plen = ntohs(phdr->param_length);
5404                 switch (ptype) {
5405 #ifdef INET
5406                 case SCTP_IPV4_ADDRESS:
5407                         {
5408                                 struct sctp_ipv4addr_param *p4, p4_buf;
5409
5410                                 phdr = sctp_get_next_param(in_initpkt, offset,
5411                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5412                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5413                                     phdr == NULL) {
5414                                         return (1);
5415                                 }
5416                                 if (asoc->scope.ipv4_addr_legal) {
5417                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5418                                         sin4.sin_addr.s_addr = p4->addr;
5419                                         sa_touse = (struct sockaddr *)&sin4;
5420                                 }
5421                                 break;
5422                         }
5423 #endif
5424 #ifdef INET6
5425                 case SCTP_IPV6_ADDRESS:
5426                         {
5427                                 struct sctp_ipv6addr_param *p6, p6_buf;
5428
5429                                 phdr = sctp_get_next_param(in_initpkt, offset,
5430                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5431                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5432                                     phdr == NULL) {
5433                                         return (1);
5434                                 }
5435                                 if (asoc->scope.ipv6_addr_legal) {
5436                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5437                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5438                                             sizeof(p6->addr));
5439                                         sa_touse = (struct sockaddr *)&sin6;
5440                                 }
5441                                 break;
5442                         }
5443 #endif
5444                 default:
5445                         sa_touse = NULL;
5446                         break;
5447                 }
5448                 if (sa_touse) {
5449                         /* ok, sa_touse points to one to check */
5450                         fnd = 0;
5451                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5452                                 sa = (struct sockaddr *)&net->ro._l_addr;
5453                                 if (sa->sa_family != sa_touse->sa_family) {
5454                                         continue;
5455                                 }
5456 #ifdef INET
5457                                 if (sa->sa_family == AF_INET) {
5458                                         sa4 = (struct sockaddr_in *)sa;
5459                                         if (sa4->sin_addr.s_addr ==
5460                                             sin4.sin_addr.s_addr) {
5461                                                 fnd = 1;
5462                                                 break;
5463                                         }
5464                                 }
5465 #endif
5466 #ifdef INET6
5467                                 if (sa->sa_family == AF_INET6) {
5468                                         sa6 = (struct sockaddr_in6 *)sa;
5469                                         if (SCTP6_ARE_ADDR_EQUAL(
5470                                             sa6, &sin6)) {
5471                                                 fnd = 1;
5472                                                 break;
5473                                         }
5474                                 }
5475 #endif
5476                         }
5477                         if (!fnd) {
5478                                 /* New addr added! no need to look further */
5479                                 return (1);
5480                         }
5481                 }
5482                 offset += SCTP_SIZE32(plen);
5483                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5484         }
5485         return (0);
5486 }
5487
5488 /*
5489  * Given a MBUF chain that was sent into us containing an INIT. Build a
5490  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5491  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5492  * message (i.e. the struct sctp_init_msg).
5493  */
5494 void
5495 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5496     struct sctp_nets *src_net, struct mbuf *init_pkt,
5497     int iphlen, int offset,
5498     struct sockaddr *src, struct sockaddr *dst,
5499     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5500     uint8_t mflowtype, uint32_t mflowid,
5501     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5502 {
5503         struct sctp_association *asoc;
5504         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5505         struct sctp_init_ack_chunk *initack;
5506         struct sctp_adaptation_layer_indication *ali;
5507         struct sctp_supported_chunk_types_param *pr_supported;
5508         struct sctp_paramhdr *ph;
5509         union sctp_sockstore *over_addr;
5510         struct sctp_scoping scp;
5511
5512 #ifdef INET
5513         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5514         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5515         struct sockaddr_in *sin;
5516
5517 #endif
5518 #ifdef INET6
5519         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5520         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5521         struct sockaddr_in6 *sin6;
5522
5523 #endif
5524         struct sockaddr *to;
5525         struct sctp_state_cookie stc;
5526         struct sctp_nets *net = NULL;
5527         uint8_t *signature = NULL;
5528         int cnt_inits_to = 0;
5529         uint16_t his_limit, i_want;
5530         int abort_flag;
5531         int nat_friendly = 0;
5532         struct socket *so;
5533         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5534
5535         if (stcb) {
5536                 asoc = &stcb->asoc;
5537         } else {
5538                 asoc = NULL;
5539         }
5540         if ((asoc != NULL) &&
5541             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5542                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5543                         /*
5544                          * new addresses, out of here in non-cookie-wait
5545                          * states
5546                          *
5547                          * Send an ABORT, without the new address error cause.
5548                          * This looks no different than if no listener was
5549                          * present.
5550                          */
5551                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5552                             "Address added");
5553                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5554                             mflowtype, mflowid, inp->fibnum,
5555                             vrf_id, port);
5556                         return;
5557                 }
5558                 if (src_net != NULL && (src_net->port != port)) {
5559                         /*
5560                          * change of remote encapsulation port, out of here
5561                          * in non-cookie-wait states
5562                          *
5563                          * Send an ABORT, without an specific error cause. This
5564                          * looks no different than if no listener was
5565                          * present.
5566                          */
5567                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5568                             "Remote encapsulation port changed");
5569                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5570                             mflowtype, mflowid, inp->fibnum,
5571                             vrf_id, port);
5572                         return;
5573                 }
5574         }
5575         abort_flag = 0;
5576         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5577             (offset + sizeof(struct sctp_init_chunk)),
5578             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5579         if (abort_flag) {
5580 do_a_abort:
5581                 if (op_err == NULL) {
5582                         char msg[SCTP_DIAG_INFO_LEN];
5583
5584                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5585                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5586                             msg);
5587                 }
5588                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5589                     init_chk->init.initiate_tag, op_err,
5590                     mflowtype, mflowid, inp->fibnum,
5591                     vrf_id, port);
5592                 return;
5593         }
5594         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5595         if (m == NULL) {
5596                 /* No memory, INIT timer will re-attempt. */
5597                 if (op_err)
5598                         sctp_m_freem(op_err);
5599                 return;
5600         }
5601         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
5602         padding_len = 0;
5603
5604         /*
5605          * We might not overwrite the identification[] completely and on
5606          * some platforms time_entered will contain some padding. Therefore
5607          * zero out the cookie to avoid putting uninitialized memory on the
5608          * wire.
5609          */
5610         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5611
5612         /* the time I built cookie */
5613         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5614
5615         /* populate any tie tags */
5616         if (asoc != NULL) {
5617                 /* unlock before tag selections */
5618                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5619                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5620                 stc.cookie_life = asoc->cookie_life;
5621                 net = asoc->primary_destination;
5622         } else {
5623                 stc.tie_tag_my_vtag = 0;
5624                 stc.tie_tag_peer_vtag = 0;
5625                 /* life I will award this cookie */
5626                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5627         }
5628
5629         /* copy in the ports for later check */
5630         stc.myport = sh->dest_port;
5631         stc.peerport = sh->src_port;
5632
5633         /*
5634          * If we wanted to honor cookie life extentions, we would add to
5635          * stc.cookie_life. For now we should NOT honor any extension
5636          */
5637         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5638         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5639                 stc.ipv6_addr_legal = 1;
5640                 if (SCTP_IPV6_V6ONLY(inp)) {
5641                         stc.ipv4_addr_legal = 0;
5642                 } else {
5643                         stc.ipv4_addr_legal = 1;
5644                 }
5645         } else {
5646                 stc.ipv6_addr_legal = 0;
5647                 stc.ipv4_addr_legal = 1;
5648         }
5649         stc.ipv4_scope = 0;
5650         if (net == NULL) {
5651                 to = src;
5652                 switch (dst->sa_family) {
5653 #ifdef INET
5654                 case AF_INET:
5655                         {
5656                                 /* lookup address */
5657                                 stc.address[0] = src4->sin_addr.s_addr;
5658                                 stc.address[1] = 0;
5659                                 stc.address[2] = 0;
5660                                 stc.address[3] = 0;
5661                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5662                                 /* local from address */
5663                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5664                                 stc.laddress[1] = 0;
5665                                 stc.laddress[2] = 0;
5666                                 stc.laddress[3] = 0;
5667                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5668                                 /* scope_id is only for v6 */
5669                                 stc.scope_id = 0;
5670                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5671                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5672                                         stc.ipv4_scope = 1;
5673                                 }
5674                                 /* Must use the address in this case */
5675                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5676                                         stc.loopback_scope = 1;
5677                                         stc.ipv4_scope = 1;
5678                                         stc.site_scope = 1;
5679                                         stc.local_scope = 0;
5680                                 }
5681                                 break;
5682                         }
5683 #endif
5684 #ifdef INET6
5685                 case AF_INET6:
5686                         {
5687                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5688                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5689                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5690                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5691                                         stc.loopback_scope = 1;
5692                                         stc.local_scope = 0;
5693                                         stc.site_scope = 1;
5694                                         stc.ipv4_scope = 1;
5695                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5696                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5697                                         /*
5698                                          * If the new destination or source
5699                                          * is a LINK_LOCAL we must have
5700                                          * common both site and local scope.
5701                                          * Don't set local scope though
5702                                          * since we must depend on the
5703                                          * source to be added implicitly. We
5704                                          * cannot assure just because we
5705                                          * share one link that all links are
5706                                          * common.
5707                                          */
5708                                         stc.local_scope = 0;
5709                                         stc.site_scope = 1;
5710                                         stc.ipv4_scope = 1;
5711                                         /*
5712                                          * we start counting for the private
5713                                          * address stuff at 1. since the
5714                                          * link local we source from won't
5715                                          * show up in our scoped count.
5716                                          */
5717                                         cnt_inits_to = 1;
5718                                         /*
5719                                          * pull out the scope_id from
5720                                          * incoming pkt
5721                                          */
5722                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5723                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5724                                         /*
5725                                          * If the new destination or source
5726                                          * is SITE_LOCAL then we must have
5727                                          * site scope in common.
5728                                          */
5729                                         stc.site_scope = 1;
5730                                 }
5731                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5732                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5733                                 break;
5734                         }
5735 #endif
5736                 default:
5737                         /* TSNH */
5738                         goto do_a_abort;
5739                         break;
5740                 }
5741         } else {
5742                 /* set the scope per the existing tcb */
5743
5744 #ifdef INET6
5745                 struct sctp_nets *lnet;
5746
5747 #endif
5748
5749                 stc.loopback_scope = asoc->scope.loopback_scope;
5750                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5751                 stc.site_scope = asoc->scope.site_scope;
5752                 stc.local_scope = asoc->scope.local_scope;
5753 #ifdef INET6
5754                 /* Why do we not consider IPv4 LL addresses? */
5755                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5756                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5757                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5758                                         /*
5759                                          * if we have a LL address, start
5760                                          * counting at 1.
5761                                          */
5762                                         cnt_inits_to = 1;
5763                                 }
5764                         }
5765                 }
5766 #endif
5767                 /* use the net pointer */
5768                 to = (struct sockaddr *)&net->ro._l_addr;
5769                 switch (to->sa_family) {
5770 #ifdef INET
5771                 case AF_INET:
5772                         sin = (struct sockaddr_in *)to;
5773                         stc.address[0] = sin->sin_addr.s_addr;
5774                         stc.address[1] = 0;
5775                         stc.address[2] = 0;
5776                         stc.address[3] = 0;
5777                         stc.addr_type = SCTP_IPV4_ADDRESS;
5778                         if (net->src_addr_selected == 0) {
5779                                 /*
5780                                  * strange case here, the INIT should have
5781                                  * did the selection.
5782                                  */
5783                                 net->ro._s_addr = sctp_source_address_selection(inp,
5784                                     stcb, (sctp_route_t *) & net->ro,
5785                                     net, 0, vrf_id);
5786                                 if (net->ro._s_addr == NULL)
5787                                         return;
5788
5789                                 net->src_addr_selected = 1;
5790
5791                         }
5792                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5793                         stc.laddress[1] = 0;
5794                         stc.laddress[2] = 0;
5795                         stc.laddress[3] = 0;
5796                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5797                         /* scope_id is only for v6 */
5798                         stc.scope_id = 0;
5799                         break;
5800 #endif
5801 #ifdef INET6
5802                 case AF_INET6:
5803                         sin6 = (struct sockaddr_in6 *)to;
5804                         memcpy(&stc.address, &sin6->sin6_addr,
5805                             sizeof(struct in6_addr));
5806                         stc.addr_type = SCTP_IPV6_ADDRESS;
5807                         stc.scope_id = sin6->sin6_scope_id;
5808                         if (net->src_addr_selected == 0) {
5809                                 /*
5810                                  * strange case here, the INIT should have
5811                                  * done the selection.
5812                                  */
5813                                 net->ro._s_addr = sctp_source_address_selection(inp,
5814                                     stcb, (sctp_route_t *) & net->ro,
5815                                     net, 0, vrf_id);
5816                                 if (net->ro._s_addr == NULL)
5817                                         return;
5818
5819                                 net->src_addr_selected = 1;
5820                         }
5821                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5822                             sizeof(struct in6_addr));
5823                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5824                         break;
5825 #endif
5826                 }
5827         }
5828         /* Now lets put the SCTP header in place */
5829         initack = mtod(m, struct sctp_init_ack_chunk *);
5830         /* Save it off for quick ref */
5831         stc.peers_vtag = init_chk->init.initiate_tag;
5832         /* who are we */
5833         memcpy(stc.identification, SCTP_VERSION_STRING,
5834             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5835         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5836         /* now the chunk header */
5837         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5838         initack->ch.chunk_flags = 0;
5839         /* fill in later from mbuf we build */
5840         initack->ch.chunk_length = 0;
5841         /* place in my tag */
5842         if ((asoc != NULL) &&
5843             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5844             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5845             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5846                 /* re-use the v-tags and init-seq here */
5847                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5848                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5849         } else {
5850                 uint32_t vtag, itsn;
5851
5852                 if (hold_inp_lock) {
5853                         SCTP_INP_INCR_REF(inp);
5854                         SCTP_INP_RUNLOCK(inp);
5855                 }
5856                 if (asoc) {
5857                         atomic_add_int(&asoc->refcnt, 1);
5858                         SCTP_TCB_UNLOCK(stcb);
5859         new_tag:
5860                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5861                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5862                                 /*
5863                                  * Got a duplicate vtag on some guy behind a
5864                                  * nat make sure we don't use it.
5865                                  */
5866                                 goto new_tag;
5867                         }
5868                         initack->init.initiate_tag = htonl(vtag);
5869                         /* get a TSN to use too */
5870                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5871                         initack->init.initial_tsn = htonl(itsn);
5872                         SCTP_TCB_LOCK(stcb);
5873                         atomic_add_int(&asoc->refcnt, -1);
5874                 } else {
5875                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5876                         initack->init.initiate_tag = htonl(vtag);
5877                         /* get a TSN to use too */
5878                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5879                 }
5880                 if (hold_inp_lock) {
5881                         SCTP_INP_RLOCK(inp);
5882                         SCTP_INP_DECR_REF(inp);
5883                 }
5884         }
5885         /* save away my tag to */
5886         stc.my_vtag = initack->init.initiate_tag;
5887
5888         /* set up some of the credits. */
5889         so = inp->sctp_socket;
5890         if (so == NULL) {
5891                 /* memory problem */
5892                 sctp_m_freem(m);
5893                 return;
5894         } else {
5895                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5896         }
5897         /* set what I want */
5898         his_limit = ntohs(init_chk->init.num_inbound_streams);
5899         /* choose what I want */
5900         if (asoc != NULL) {
5901                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5902                         i_want = asoc->streamoutcnt;
5903                 } else {
5904                         i_want = asoc->pre_open_streams;
5905                 }
5906         } else {
5907                 i_want = inp->sctp_ep.pre_open_stream_count;
5908         }
5909         if (his_limit < i_want) {
5910                 /* I Want more :< */
5911                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5912         } else {
5913                 /* I can have what I want :> */
5914                 initack->init.num_outbound_streams = htons(i_want);
5915         }
5916         /* tell him his limit. */
5917         initack->init.num_inbound_streams =
5918             htons(inp->sctp_ep.max_open_streams_intome);
5919
5920         /* adaptation layer indication parameter */
5921         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5922                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
5923                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5924                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5925                 ali->ph.param_length = htons(parameter_len);
5926                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5927                 chunk_len += parameter_len;
5928         }
5929         /* ECN parameter */
5930         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5931             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5932                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5933                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5934                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5935                 ph->param_length = htons(parameter_len);
5936                 chunk_len += parameter_len;
5937         }
5938         /* PR-SCTP supported parameter */
5939         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5940             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5941                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5942                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5943                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5944                 ph->param_length = htons(parameter_len);
5945                 chunk_len += parameter_len;
5946         }
5947         /* Add NAT friendly parameter */
5948         if (nat_friendly) {
5949                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
5950                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5951                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5952                 ph->param_length = htons(parameter_len);
5953                 chunk_len += parameter_len;
5954         }
5955         /* And now tell the peer which extensions we support */
5956         num_ext = 0;
5957         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5958         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5959             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5960                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5961                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5962                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5963                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5964                 }
5965         }
5966         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5967             ((asoc == NULL) && (inp->auth_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5969         }
5970         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5971             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5973                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5974         }
5975         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5976             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5977                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5978         }
5979         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5980             ((asoc == NULL) && (inp->idata_supported == 1))) {
5981                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5982         }
5983         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5984             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5985                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5986         }
5987         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5988             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5989                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5990         }
5991         if (num_ext > 0) {
5992                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5993                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5994                 pr_supported->ph.param_length = htons(parameter_len);
5995                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5996                 chunk_len += parameter_len;
5997         }
5998         /* add authentication parameters */
5999         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6000             ((asoc == NULL) && (inp->auth_supported == 1))) {
6001                 struct sctp_auth_random *randp;
6002                 struct sctp_auth_hmac_algo *hmacs;
6003                 struct sctp_auth_chunk_list *chunks;
6004
6005                 if (padding_len > 0) {
6006                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6007                         chunk_len += padding_len;
6008                         padding_len = 0;
6009                 }
6010                 /* generate and add RANDOM parameter */
6011                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6012                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
6013                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6014                 randp->ph.param_type = htons(SCTP_RANDOM);
6015                 randp->ph.param_length = htons(parameter_len);
6016                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6017                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6018                 chunk_len += parameter_len;
6019
6020                 if (padding_len > 0) {
6021                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6022                         chunk_len += padding_len;
6023                         padding_len = 0;
6024                 }
6025                 /* add HMAC_ALGO parameter */
6026                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6027                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
6028                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6029                     (uint8_t *) hmacs->hmac_ids);
6030                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6031                 hmacs->ph.param_length = htons(parameter_len);
6032                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6033                 chunk_len += parameter_len;
6034
6035                 if (padding_len > 0) {
6036                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6037                         chunk_len += padding_len;
6038                         padding_len = 0;
6039                 }
6040                 /* add CHUNKS parameter */
6041                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6042                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
6043                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6044                     chunks->chunk_types);
6045                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6046                 chunks->ph.param_length = htons(parameter_len);
6047                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6048                 chunk_len += parameter_len;
6049         }
6050         SCTP_BUF_LEN(m) = chunk_len;
6051         m_last = m;
6052         /* now the addresses */
6053         /*
6054          * To optimize this we could put the scoping stuff into a structure
6055          * and remove the individual uint8's from the stc structure. Then we
6056          * could just sifa in the address within the stc.. but for now this
6057          * is a quick hack to get the address stuff teased apart.
6058          */
6059         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6060         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6061         scp.loopback_scope = stc.loopback_scope;
6062         scp.ipv4_local_scope = stc.ipv4_scope;
6063         scp.local_scope = stc.local_scope;
6064         scp.site_scope = stc.site_scope;
6065         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6066             cnt_inits_to,
6067             &padding_len, &chunk_len);
6068         /* padding_len can only be positive, if no addresses have been added */
6069         if (padding_len > 0) {
6070                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6071                 chunk_len += padding_len;
6072                 SCTP_BUF_LEN(m) += padding_len;
6073                 padding_len = 0;
6074         }
6075         /* tack on the operational error if present */
6076         if (op_err) {
6077                 parameter_len = 0;
6078                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6079                         parameter_len += SCTP_BUF_LEN(m_tmp);
6080                 }
6081                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6082                 SCTP_BUF_NEXT(m_last) = op_err;
6083                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6084                         m_last = SCTP_BUF_NEXT(m_last);
6085                 }
6086                 chunk_len += parameter_len;
6087         }
6088         if (padding_len > 0) {
6089                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6090                 if (m_last == NULL) {
6091                         /* Houston we have a problem, no space */
6092                         sctp_m_freem(m);
6093                         return;
6094                 }
6095                 chunk_len += padding_len;
6096                 padding_len = 0;
6097         }
6098         /* Now we must build a cookie */
6099         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6100         if (m_cookie == NULL) {
6101                 /* memory problem */
6102                 sctp_m_freem(m);
6103                 return;
6104         }
6105         /* Now append the cookie to the end and update the space/size */
6106         SCTP_BUF_NEXT(m_last) = m_cookie;
6107         parameter_len = 0;
6108         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6109                 parameter_len += SCTP_BUF_LEN(m_tmp);
6110                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6111                         m_last = m_tmp;
6112                 }
6113         }
6114         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6115         chunk_len += parameter_len;
6116
6117         /*
6118          * Place in the size, but we don't include the last pad (if any) in
6119          * the INIT-ACK.
6120          */
6121         initack->ch.chunk_length = htons(chunk_len);
6122
6123         /*
6124          * Time to sign the cookie, we don't sign over the cookie signature
6125          * though thus we set trailer.
6126          */
6127         (void)sctp_hmac_m(SCTP_HMAC,
6128             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6129             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6130             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6131         /*
6132          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6133          * here since the timer will drive a retranmission.
6134          */
6135         if (padding_len > 0) {
6136                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6137                         sctp_m_freem(m);
6138                         return;
6139                 }
6140         }
6141         if (stc.loopback_scope) {
6142                 over_addr = (union sctp_sockstore *)dst;
6143         } else {
6144                 over_addr = NULL;
6145         }
6146
6147         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6148             0, 0,
6149             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6150             port, over_addr,
6151             mflowtype, mflowid,
6152             SCTP_SO_NOT_LOCKED);
6153         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6154 }
6155
6156
6157 static void
6158 sctp_prune_prsctp(struct sctp_tcb *stcb,
6159     struct sctp_association *asoc,
6160     struct sctp_sndrcvinfo *srcv,
6161     int dataout)
6162 {
6163         int freed_spc = 0;
6164         struct sctp_tmit_chunk *chk, *nchk;
6165
6166         SCTP_TCB_LOCK_ASSERT(stcb);
6167         if ((asoc->prsctp_supported) &&
6168             (asoc->sent_queue_cnt_removeable > 0)) {
6169                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6170                         /*
6171                          * Look for chunks marked with the PR_SCTP flag AND
6172                          * the buffer space flag. If the one being sent is
6173                          * equal or greater priority then purge the old one
6174                          * and free some space.
6175                          */
6176                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6177                                 /*
6178                                  * This one is PR-SCTP AND buffer space
6179                                  * limited type
6180                                  */
6181                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6182                                         /*
6183                                          * Lower numbers equates to higher
6184                                          * priority so if the one we are
6185                                          * looking at has a larger or equal
6186                                          * priority we want to drop the data
6187                                          * and NOT retransmit it.
6188                                          */
6189                                         if (chk->data) {
6190                                                 /*
6191                                                  * We release the book_size
6192                                                  * if the mbuf is here
6193                                                  */
6194                                                 int ret_spc;
6195                                                 uint8_t sent;
6196
6197                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6198                                                         sent = 1;
6199                                                 else
6200                                                         sent = 0;
6201                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6202                                                     sent,
6203                                                     SCTP_SO_LOCKED);
6204                                                 freed_spc += ret_spc;
6205                                                 if (freed_spc >= dataout) {
6206                                                         return;
6207                                                 }
6208                                         }       /* if chunk was present */
6209                                 }       /* if of sufficent priority */
6210                         }       /* if chunk has enabled */
6211                 }               /* tailqforeach */
6212
6213                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6214                         /* Here we must move to the sent queue and mark */
6215                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6216                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6217                                         if (chk->data) {
6218                                                 /*
6219                                                  * We release the book_size
6220                                                  * if the mbuf is here
6221                                                  */
6222                                                 int ret_spc;
6223
6224                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6225                                                     0, SCTP_SO_LOCKED);
6226
6227                                                 freed_spc += ret_spc;
6228                                                 if (freed_spc >= dataout) {
6229                                                         return;
6230                                                 }
6231                                         }       /* end if chk->data */
6232                                 }       /* end if right class */
6233                         }       /* end if chk pr-sctp */
6234                 }               /* tailqforeachsafe (chk) */
6235         }                       /* if enabled in asoc */
6236 }
6237
6238 int
6239 sctp_get_frag_point(struct sctp_tcb *stcb,
6240     struct sctp_association *asoc)
6241 {
6242         int siz, ovh;
6243
6244         /*
6245          * For endpoints that have both v6 and v4 addresses we must reserve
6246          * room for the ipv6 header, for those that are only dealing with V4
6247          * we use a larger frag point.
6248          */
6249         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6250                 ovh = SCTP_MIN_OVERHEAD;
6251         } else {
6252                 ovh = SCTP_MIN_V4_OVERHEAD;
6253         }
6254         if (stcb->asoc.idata_supported) {
6255                 ovh += sizeof(struct sctp_idata_chunk);
6256         } else {
6257                 ovh += sizeof(struct sctp_data_chunk);
6258         }
6259         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6260                 siz = asoc->smallest_mtu - ovh;
6261         else
6262                 siz = (stcb->asoc.sctp_frag_point - ovh);
6263         /*
6264          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6265          */
6266         /* A data chunk MUST fit in a cluster */
6267         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6268         /* } */
6269
6270         /* adjust for an AUTH chunk if DATA requires auth */
6271         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6272                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6273
6274         if (siz % 4) {
6275                 /* make it an even word boundary please */
6276                 siz -= (siz % 4);
6277         }
6278         return (siz);
6279 }
6280
6281 static void
6282 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6283 {
6284         /*
6285          * We assume that the user wants PR_SCTP_TTL if the user provides a
6286          * positive lifetime but does not specify any PR_SCTP policy.
6287          */
6288         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6289                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6290         } else if (sp->timetolive > 0) {
6291                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6292                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6293         } else {
6294                 return;
6295         }
6296         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6297         case CHUNK_FLAGS_PR_SCTP_BUF:
6298                 /*
6299                  * Time to live is a priority stored in tv_sec when doing
6300                  * the buffer drop thing.
6301                  */
6302                 sp->ts.tv_sec = sp->timetolive;
6303                 sp->ts.tv_usec = 0;
6304                 break;
6305         case CHUNK_FLAGS_PR_SCTP_TTL:
6306                 {
6307                         struct timeval tv;
6308
6309                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6310                         tv.tv_sec = sp->timetolive / 1000;
6311                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6312                         /*
6313                          * TODO sctp_constants.h needs alternative time
6314                          * macros when _KERNEL is undefined.
6315                          */
6316                         timevaladd(&sp->ts, &tv);
6317                 }
6318                 break;
6319         case CHUNK_FLAGS_PR_SCTP_RTX:
6320                 /*
6321                  * Time to live is a the number or retransmissions stored in
6322                  * tv_sec.
6323                  */
6324                 sp->ts.tv_sec = sp->timetolive;
6325                 sp->ts.tv_usec = 0;
6326                 break;
6327         default:
6328                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6329                     "Unknown PR_SCTP policy %u.\n",
6330                     PR_SCTP_POLICY(sp->sinfo_flags));
6331                 break;
6332         }
6333 }
6334
6335 static int
6336 sctp_msg_append(struct sctp_tcb *stcb,
6337     struct sctp_nets *net,
6338     struct mbuf *m,
6339     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6340 {
6341         int error = 0;
6342         struct mbuf *at;
6343         struct sctp_stream_queue_pending *sp = NULL;
6344         struct sctp_stream_out *strm;
6345
6346         /*
6347          * Given an mbuf chain, put it into the association send queue and
6348          * place it on the wheel
6349          */
6350         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6351                 /* Invalid stream number */
6352                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6353                 error = EINVAL;
6354                 goto out_now;
6355         }
6356         if ((stcb->asoc.stream_locked) &&
6357             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6358                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6359                 error = EINVAL;
6360                 goto out_now;
6361         }
6362         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6363         /* Now can we send this? */
6364         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6365             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6366             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6367             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6368                 /* got data while shutting down */
6369                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6370                 error = ECONNRESET;
6371                 goto out_now;
6372         }
6373         sctp_alloc_a_strmoq(stcb, sp);
6374         if (sp == NULL) {
6375                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6376                 error = ENOMEM;
6377                 goto out_now;
6378         }
6379         sp->sinfo_flags = srcv->sinfo_flags;
6380         sp->timetolive = srcv->sinfo_timetolive;
6381         sp->ppid = srcv->sinfo_ppid;
6382         sp->context = srcv->sinfo_context;
6383         sp->fsn = 0;
6384         sp->msg_id = atomic_fetchadd_int(&stcb->asoc.assoc_msg_id, 1);
6385         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6386                 sp->net = net;
6387                 atomic_add_int(&sp->net->ref_count, 1);
6388         } else {
6389                 sp->net = NULL;
6390         }
6391         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6392         sp->stream = srcv->sinfo_stream;
6393         sp->msg_is_complete = 1;
6394         sp->sender_all_done = 1;
6395         sp->some_taken = 0;
6396         sp->data = m;
6397         sp->tail_mbuf = NULL;
6398         sctp_set_prsctp_policy(sp);
6399         /*
6400          * We could in theory (for sendall) sifa the length in, but we would
6401          * still have to hunt through the chain since we need to setup the
6402          * tail_mbuf
6403          */
6404         sp->length = 0;
6405         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6406                 if (SCTP_BUF_NEXT(at) == NULL)
6407                         sp->tail_mbuf = at;
6408                 sp->length += SCTP_BUF_LEN(at);
6409         }
6410         if (srcv->sinfo_keynumber_valid) {
6411                 sp->auth_keyid = srcv->sinfo_keynumber;
6412         } else {
6413                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6414         }
6415         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6416                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6417                 sp->holds_key_ref = 1;
6418         }
6419         if (hold_stcb_lock == 0) {
6420                 SCTP_TCB_SEND_LOCK(stcb);
6421         }
6422         sctp_snd_sb_alloc(stcb, sp->length);
6423         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6424         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6425         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6426         m = NULL;
6427         if (hold_stcb_lock == 0) {
6428                 SCTP_TCB_SEND_UNLOCK(stcb);
6429         }
6430 out_now:
6431         if (m) {
6432                 sctp_m_freem(m);
6433         }
6434         return (error);
6435 }
6436
6437
6438 static struct mbuf *
6439 sctp_copy_mbufchain(struct mbuf *clonechain,
6440     struct mbuf *outchain,
6441     struct mbuf **endofchain,
6442     int can_take_mbuf,
6443     int sizeofcpy,
6444     uint8_t copy_by_ref)
6445 {
6446         struct mbuf *m;
6447         struct mbuf *appendchain;
6448         caddr_t cp;
6449         int len;
6450
6451         if (endofchain == NULL) {
6452                 /* error */
6453 error_out:
6454                 if (outchain)
6455                         sctp_m_freem(outchain);
6456                 return (NULL);
6457         }
6458         if (can_take_mbuf) {
6459                 appendchain = clonechain;
6460         } else {
6461                 if (!copy_by_ref &&
6462                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6463                     ) {
6464                         /* Its not in a cluster */
6465                         if (*endofchain == NULL) {
6466                                 /* lets get a mbuf cluster */
6467                                 if (outchain == NULL) {
6468                                         /* This is the general case */
6469                         new_mbuf:
6470                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6471                                         if (outchain == NULL) {
6472                                                 goto error_out;
6473                                         }
6474                                         SCTP_BUF_LEN(outchain) = 0;
6475                                         *endofchain = outchain;
6476                                         /* get the prepend space */
6477                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6478                                 } else {
6479                                         /*
6480                                          * We really should not get a NULL
6481                                          * in endofchain
6482                                          */
6483                                         /* find end */
6484                                         m = outchain;
6485                                         while (m) {
6486                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6487                                                         *endofchain = m;
6488                                                         break;
6489                                                 }
6490                                                 m = SCTP_BUF_NEXT(m);
6491                                         }
6492                                         /* sanity */
6493                                         if (*endofchain == NULL) {
6494                                                 /*
6495                                                  * huh, TSNH XXX maybe we
6496                                                  * should panic
6497                                                  */
6498                                                 sctp_m_freem(outchain);
6499                                                 goto new_mbuf;
6500                                         }
6501                                 }
6502                                 /* get the new end of length */
6503                                 len = (int)M_TRAILINGSPACE(*endofchain);
6504                         } else {
6505                                 /* how much is left at the end? */
6506                                 len = (int)M_TRAILINGSPACE(*endofchain);
6507                         }
6508                         /* Find the end of the data, for appending */
6509                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6510
6511                         /* Now lets copy it out */
6512                         if (len >= sizeofcpy) {
6513                                 /* It all fits, copy it in */
6514                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6515                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6516                         } else {
6517                                 /* fill up the end of the chain */
6518                                 if (len > 0) {
6519                                         m_copydata(clonechain, 0, len, cp);
6520                                         SCTP_BUF_LEN((*endofchain)) += len;
6521                                         /* now we need another one */
6522                                         sizeofcpy -= len;
6523                                 }
6524                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6525                                 if (m == NULL) {
6526                                         /* We failed */
6527                                         goto error_out;
6528                                 }
6529                                 SCTP_BUF_NEXT((*endofchain)) = m;
6530                                 *endofchain = m;
6531                                 cp = mtod((*endofchain), caddr_t);
6532                                 m_copydata(clonechain, len, sizeofcpy, cp);
6533                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6534                         }
6535                         return (outchain);
6536                 } else {
6537                         /* copy the old fashion way */
6538                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6539 #ifdef SCTP_MBUF_LOGGING
6540                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6541                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6542                         }
6543 #endif
6544                 }
6545         }
6546         if (appendchain == NULL) {
6547                 /* error */
6548                 if (outchain)
6549                         sctp_m_freem(outchain);
6550                 return (NULL);
6551         }
6552         if (outchain) {
6553                 /* tack on to the end */
6554                 if (*endofchain != NULL) {
6555                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6556                 } else {
6557                         m = outchain;
6558                         while (m) {
6559                                 if (SCTP_BUF_NEXT(m) == NULL) {
6560                                         SCTP_BUF_NEXT(m) = appendchain;
6561                                         break;
6562                                 }
6563                                 m = SCTP_BUF_NEXT(m);
6564                         }
6565                 }
6566                 /*
6567                  * save off the end and update the end-chain postion
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 postion */
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 feasable 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, leading;
7190         uint8_t rcv_flags = 0;
7191         uint8_t some_taken;
7192         uint8_t send_lock_up = 0;
7193
7194         SCTP_TCB_LOCK_ASSERT(stcb);
7195         asoc = &stcb->asoc;
7196 one_more_time:
7197         /* sa_ignore FREED_MEMORY */
7198         *locked = 0;
7199         sp = TAILQ_FIRST(&strq->outqueue);
7200         if (sp == NULL) {
7201                 *locked = 0;
7202                 if (send_lock_up == 0) {
7203                         SCTP_TCB_SEND_LOCK(stcb);
7204                         send_lock_up = 1;
7205                 }
7206                 sp = TAILQ_FIRST(&strq->outqueue);
7207                 if (sp) {
7208                         goto one_more_time;
7209                 }
7210                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7211                     (stcb->asoc.idata_supported == 0) &&
7212                     (strq->last_msg_incomplete)) {
7213                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7214                             strq->stream_no,
7215                             strq->last_msg_incomplete);
7216                         strq->last_msg_incomplete = 0;
7217                 }
7218                 to_move = 0;
7219                 if (send_lock_up) {
7220                         SCTP_TCB_SEND_UNLOCK(stcb);
7221                         send_lock_up = 0;
7222                 }
7223                 goto out_of;
7224         }
7225         if ((sp->msg_is_complete) && (sp->length == 0)) {
7226                 if (sp->sender_all_done) {
7227                         /*
7228                          * We are doing differed cleanup. Last time through
7229                          * when we took all the data the sender_all_done was
7230                          * not set.
7231                          */
7232                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7233                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7234                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7235                                     sp->sender_all_done,
7236                                     sp->length,
7237                                     sp->msg_is_complete,
7238                                     sp->put_last_out,
7239                                     send_lock_up);
7240                         }
7241                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7242                                 SCTP_TCB_SEND_LOCK(stcb);
7243                                 send_lock_up = 1;
7244                         }
7245                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7246                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7247                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7248                             (strq->chunks_on_queues == 0) &&
7249                             TAILQ_EMPTY(&strq->outqueue)) {
7250                                 stcb->asoc.trigger_reset = 1;
7251                         }
7252                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7253                         if (sp->net) {
7254                                 sctp_free_remote_addr(sp->net);
7255                                 sp->net = NULL;
7256                         }
7257                         if (sp->data) {
7258                                 sctp_m_freem(sp->data);
7259                                 sp->data = NULL;
7260                         }
7261                         sctp_free_a_strmoq(stcb, sp, so_locked);
7262                         /* we can't be locked to it */
7263                         *locked = 0;
7264                         stcb->asoc.locked_on_sending = NULL;
7265                         if (send_lock_up) {
7266                                 SCTP_TCB_SEND_UNLOCK(stcb);
7267                                 send_lock_up = 0;
7268                         }
7269                         /* back to get the next msg */
7270                         goto one_more_time;
7271                 } else {
7272                         /*
7273                          * sender just finished this but still holds a
7274                          * reference
7275                          */
7276                         if (stcb->asoc.idata_supported == 0)
7277                                 *locked = 1;
7278                         *giveup = 1;
7279                         to_move = 0;
7280                         goto out_of;
7281                 }
7282         } else {
7283                 /* is there some to get */
7284                 if (sp->length == 0) {
7285                         /* no */
7286                         if (stcb->asoc.idata_supported == 0)
7287                                 *locked = 1;
7288                         *giveup = 1;
7289                         to_move = 0;
7290                         goto out_of;
7291                 } else if (sp->discard_rest) {
7292                         if (send_lock_up == 0) {
7293                                 SCTP_TCB_SEND_LOCK(stcb);
7294                                 send_lock_up = 1;
7295                         }
7296                         /* Whack down the size */
7297                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7298                         if ((stcb->sctp_socket != NULL) &&
7299                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7300                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7301                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7302                         }
7303                         if (sp->data) {
7304                                 sctp_m_freem(sp->data);
7305                                 sp->data = NULL;
7306                                 sp->tail_mbuf = NULL;
7307                         }
7308                         sp->length = 0;
7309                         sp->some_taken = 1;
7310                         if (stcb->asoc.idata_supported == 0)
7311                                 *locked = 1;
7312                         *giveup = 1;
7313                         to_move = 0;
7314                         goto out_of;
7315                 }
7316         }
7317         some_taken = sp->some_taken;
7318 re_look:
7319         length = sp->length;
7320         if (sp->msg_is_complete) {
7321                 /* The message is complete */
7322                 to_move = min(length, frag_point);
7323                 if (to_move == length) {
7324                         /* All of it fits in the MTU */
7325                         if (sp->some_taken) {
7326                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7327                                 sp->put_last_out = 1;
7328                         } else {
7329                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7330                                 sp->put_last_out = 1;
7331                         }
7332                 } else {
7333                         /* Not all of it fits, we fragment */
7334                         if (sp->some_taken == 0) {
7335                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7336                         }
7337                         sp->some_taken = 1;
7338                 }
7339         } else {
7340                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7341                 if (to_move) {
7342                         /*-
7343                          * We use a snapshot of length in case it
7344                          * is expanding during the compare.
7345                          */
7346                         uint32_t llen;
7347
7348                         llen = length;
7349                         if (to_move >= llen) {
7350                                 to_move = llen;
7351                                 if (send_lock_up == 0) {
7352                                         /*-
7353                                          * We are taking all of an incomplete msg
7354                                          * thus we need a send lock.
7355                                          */
7356                                         SCTP_TCB_SEND_LOCK(stcb);
7357                                         send_lock_up = 1;
7358                                         if (sp->msg_is_complete) {
7359                                                 /*
7360                                                  * the sender finished the
7361                                                  * msg
7362                                                  */
7363                                                 goto re_look;
7364                                         }
7365                                 }
7366                         }
7367                         if (sp->some_taken == 0) {
7368                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7369                                 sp->some_taken = 1;
7370                         }
7371                 } else {
7372                         /* Nothing to take. */
7373                         if ((sp->some_taken) &&
7374                             (stcb->asoc.idata_supported == 0)) {
7375                                 *locked = 1;
7376                         }
7377                         *giveup = 1;
7378                         to_move = 0;
7379                         goto out_of;
7380                 }
7381         }
7382
7383         /* If we reach here, we can copy out a chunk */
7384         sctp_alloc_a_chunk(stcb, chk);
7385         if (chk == NULL) {
7386                 /* No chunk memory */
7387                 *giveup = 1;
7388                 to_move = 0;
7389                 goto out_of;
7390         }
7391         /*
7392          * Setup for unordered if needed by looking at the user sent info
7393          * flags.
7394          */
7395         if (sp->sinfo_flags & SCTP_UNORDERED) {
7396                 rcv_flags |= SCTP_DATA_UNORDERED;
7397         }
7398         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7399             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7400                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7401         }
7402         /* clear out the chunk before setting up */
7403         memset(chk, 0, sizeof(*chk));
7404         chk->rec.data.rcv_flags = rcv_flags;
7405
7406         if (to_move >= length) {
7407                 /* we think we can steal the whole thing */
7408                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7409                         SCTP_TCB_SEND_LOCK(stcb);
7410                         send_lock_up = 1;
7411                 }
7412                 if (to_move < sp->length) {
7413                         /* bail, it changed */
7414                         goto dont_do_it;
7415                 }
7416                 chk->data = sp->data;
7417                 chk->last_mbuf = sp->tail_mbuf;
7418                 /* register the stealing */
7419                 sp->data = sp->tail_mbuf = NULL;
7420         } else {
7421                 struct mbuf *m;
7422
7423 dont_do_it:
7424                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7425                 chk->last_mbuf = NULL;
7426                 if (chk->data == NULL) {
7427                         sp->some_taken = some_taken;
7428                         sctp_free_a_chunk(stcb, chk, so_locked);
7429                         *bail = 1;
7430                         to_move = 0;
7431                         goto out_of;
7432                 }
7433 #ifdef SCTP_MBUF_LOGGING
7434                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7435                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7436                 }
7437 #endif
7438                 /* Pull off the data */
7439                 m_adj(sp->data, to_move);
7440                 /* Now lets work our way down and compact it */
7441                 m = sp->data;
7442                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7443                         sp->data = SCTP_BUF_NEXT(m);
7444                         SCTP_BUF_NEXT(m) = NULL;
7445                         if (sp->tail_mbuf == m) {
7446                                 /*-
7447                                  * Freeing tail? TSNH since
7448                                  * we supposedly were taking less
7449                                  * than the sp->length.
7450                                  */
7451 #ifdef INVARIANTS
7452                                 panic("Huh, freing tail? - TSNH");
7453 #else
7454                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7455                                 sp->tail_mbuf = sp->data = NULL;
7456                                 sp->length = 0;
7457 #endif
7458
7459                         }
7460                         sctp_m_free(m);
7461                         m = sp->data;
7462                 }
7463         }
7464         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7465                 chk->copy_by_ref = 1;
7466         } else {
7467                 chk->copy_by_ref = 0;
7468         }
7469         /*
7470          * get last_mbuf and counts of mb useage This is ugly but hopefully
7471          * its only one mbuf.
7472          */
7473         if (chk->last_mbuf == NULL) {
7474                 chk->last_mbuf = chk->data;
7475                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7476                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7477                 }
7478         }
7479         if (to_move > length) {
7480                 /*- This should not happen either
7481                  * since we always lower to_move to the size
7482                  * of sp->length if its larger.
7483                  */
7484 #ifdef INVARIANTS
7485                 panic("Huh, how can to_move be larger?");
7486 #else
7487                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7488                 sp->length = 0;
7489 #endif
7490         } else {
7491                 atomic_subtract_int(&sp->length, to_move);
7492         }
7493         if (stcb->asoc.idata_supported == 0) {
7494                 leading = (int)sizeof(struct sctp_data_chunk);
7495         } else {
7496                 leading = (int)sizeof(struct sctp_idata_chunk);
7497         }
7498         if (M_LEADINGSPACE(chk->data) < leading) {
7499                 /* Not enough room for a chunk header, get some */
7500                 struct mbuf *m;
7501
7502                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7503                 if (m == NULL) {
7504                         /*
7505                          * we're in trouble here. _PREPEND below will free
7506                          * all the data if there is no leading space, so we
7507                          * must put the data back and restore.
7508                          */
7509                         if (send_lock_up == 0) {
7510                                 SCTP_TCB_SEND_LOCK(stcb);
7511                                 send_lock_up = 1;
7512                         }
7513                         if (sp->data == NULL) {
7514                                 /* unsteal the data */
7515                                 sp->data = chk->data;
7516                                 sp->tail_mbuf = chk->last_mbuf;
7517                         } else {
7518                                 struct mbuf *m_tmp;
7519
7520                                 /* reassemble the data */
7521                                 m_tmp = sp->data;
7522                                 sp->data = chk->data;
7523                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7524                         }
7525                         sp->some_taken = some_taken;
7526                         atomic_add_int(&sp->length, to_move);
7527                         chk->data = NULL;
7528                         *bail = 1;
7529                         sctp_free_a_chunk(stcb, chk, so_locked);
7530                         to_move = 0;
7531                         goto out_of;
7532                 } else {
7533                         SCTP_BUF_LEN(m) = 0;
7534                         SCTP_BUF_NEXT(m) = chk->data;
7535                         chk->data = m;
7536                         M_ALIGN(chk->data, 4);
7537                 }
7538         }
7539         if (stcb->asoc.idata_supported == 0) {
7540                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7541         } else {
7542                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7543         }
7544         if (chk->data == NULL) {
7545                 /* HELP, TSNH since we assured it would not above? */
7546 #ifdef INVARIANTS
7547                 panic("prepend failes HELP?");
7548 #else
7549                 SCTP_PRINTF("prepend fails HELP?\n");
7550                 sctp_free_a_chunk(stcb, chk, so_locked);
7551 #endif
7552                 *bail = 1;
7553                 to_move = 0;
7554                 goto out_of;
7555         }
7556         if (stcb->asoc.idata_supported == 0) {
7557                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7558                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_data_chunk));
7559         } else {
7560                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7561                 chk->book_size = chk->send_size = (uint16_t) (to_move + sizeof(struct sctp_idata_chunk));
7562         }
7563         chk->book_size_scale = 0;
7564         chk->sent = SCTP_DATAGRAM_UNSENT;
7565
7566         chk->flags = 0;
7567         chk->asoc = &stcb->asoc;
7568         chk->pad_inplace = 0;
7569         chk->no_fr_allowed = 0;
7570         chk->rec.data.stream_seq = strq->next_sequence_send;
7571         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7572             !(rcv_flags & SCTP_DATA_UNORDERED)) {
7573                 strq->next_sequence_send++;
7574         }
7575         chk->rec.data.stream_number = sp->stream;
7576         chk->rec.data.payloadtype = sp->ppid;
7577         chk->rec.data.context = sp->context;
7578         chk->rec.data.doing_fast_retransmit = 0;
7579
7580         chk->rec.data.timetodrop = sp->ts;
7581         chk->flags = sp->act_flags;
7582
7583         if (sp->net) {
7584                 chk->whoTo = sp->net;
7585                 atomic_add_int(&chk->whoTo->ref_count, 1);
7586         } else
7587                 chk->whoTo = NULL;
7588
7589         if (sp->holds_key_ref) {
7590                 chk->auth_keyid = sp->auth_keyid;
7591                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7592                 chk->holds_key_ref = 1;
7593         }
7594         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7595         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7596                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7597                     (uint32_t) (uintptr_t) stcb, sp->length,
7598                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7599                     chk->rec.data.TSN_seq);
7600         }
7601         if (stcb->asoc.idata_supported == 0) {
7602                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7603         } else {
7604                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7605         }
7606         /*
7607          * Put the rest of the things in place now. Size was done earlier in
7608          * previous loop prior to padding.
7609          */
7610
7611 #ifdef SCTP_ASOCLOG_OF_TSNS
7612         SCTP_TCB_LOCK_ASSERT(stcb);
7613         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7614                 asoc->tsn_out_at = 0;
7615                 asoc->tsn_out_wrapped = 1;
7616         }
7617         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7618         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7619         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7620         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7621         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7622         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7623         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7624         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7625         asoc->tsn_out_at++;
7626 #endif
7627         if (stcb->asoc.idata_supported == 0) {
7628                 dchkh->ch.chunk_type = SCTP_DATA;
7629                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7630                 dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7631                 dchkh->dp.stream_id = htons((strq->stream_no & 0x0000ffff));
7632                 dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7633                 dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7634                 dchkh->ch.chunk_length = htons(chk->send_size);
7635         } else {
7636                 ndchkh->ch.chunk_type = SCTP_IDATA;
7637                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7638                 ndchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7639                 ndchkh->dp.stream_id = htons(strq->stream_no);
7640                 /* WHAT DO WE DO HERE??? */
7641                 ndchkh->dp.reserved = htons(0);
7642                 ndchkh->dp.msg_id = htonl(sp->msg_id);
7643                 if (sp->fsn == 0)
7644                         ndchkh->dp.protocol_id = chk->rec.data.payloadtype;
7645                 else
7646                         ndchkh->dp.fsn = htonl(sp->fsn);
7647                 sp->fsn++;
7648                 ndchkh->ch.chunk_length = htons(chk->send_size);
7649         }
7650         /* Now advance the chk->send_size by the actual pad needed. */
7651         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7652                 /* need a pad */
7653                 struct mbuf *lm;
7654                 int pads;
7655
7656                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7657                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7658                 if (lm != NULL) {
7659                         chk->last_mbuf = lm;
7660                         chk->pad_inplace = 1;
7661                 }
7662                 chk->send_size += pads;
7663         }
7664         if (PR_SCTP_ENABLED(chk->flags)) {
7665                 asoc->pr_sctp_cnt++;
7666         }
7667         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7668                 /* All done pull and kill the message */
7669                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7670                 if (sp->put_last_out == 0) {
7671                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7672                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7673                             sp->sender_all_done,
7674                             sp->length,
7675                             sp->msg_is_complete,
7676                             sp->put_last_out,
7677                             send_lock_up);
7678                 }
7679                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7680                         SCTP_TCB_SEND_LOCK(stcb);
7681                         send_lock_up = 1;
7682                 }
7683                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7684                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7685                     (strq->chunks_on_queues == 0) &&
7686                     TAILQ_EMPTY(&strq->outqueue)) {
7687                         stcb->asoc.trigger_reset = 1;
7688                 }
7689                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7690                 if (sp->net) {
7691                         sctp_free_remote_addr(sp->net);
7692                         sp->net = NULL;
7693                 }
7694                 if (sp->data) {
7695                         sctp_m_freem(sp->data);
7696                         sp->data = NULL;
7697                 }
7698                 sctp_free_a_strmoq(stcb, sp, so_locked);
7699
7700                 /* we can't be locked to it */
7701                 *locked = 0;
7702                 stcb->asoc.locked_on_sending = NULL;
7703         } else {
7704                 /* more to go, we are locked */
7705                 if (stcb->asoc.idata_supported == 0)
7706                         *locked = 1;
7707         }
7708         asoc->chunks_on_out_queue++;
7709         strq->chunks_on_queues++;
7710         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7711         asoc->send_queue_cnt++;
7712 out_of:
7713         if (send_lock_up) {
7714                 SCTP_TCB_SEND_UNLOCK(stcb);
7715         }
7716         return (to_move);
7717 }
7718
7719
7720 static void
7721 sctp_fill_outqueue(struct sctp_tcb *stcb,
7722     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7723 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7724     SCTP_UNUSED
7725 #endif
7726 )
7727 {
7728         struct sctp_association *asoc;
7729         struct sctp_stream_out *strq;
7730         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7731         int locked, giveup;
7732
7733         SCTP_TCB_LOCK_ASSERT(stcb);
7734         asoc = &stcb->asoc;
7735         switch (net->ro._l_addr.sa.sa_family) {
7736 #ifdef INET
7737         case AF_INET:
7738                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7739                 break;
7740 #endif
7741 #ifdef INET6
7742         case AF_INET6:
7743                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7744                 break;
7745 #endif
7746         default:
7747                 /* TSNH */
7748                 goal_mtu = net->mtu;
7749                 break;
7750         }
7751         /* Need an allowance for the data chunk header too */
7752         if (stcb->asoc.idata_supported == 0) {
7753                 goal_mtu -= sizeof(struct sctp_data_chunk);
7754         } else {
7755                 goal_mtu -= sizeof(struct sctp_idata_chunk);
7756         }
7757
7758         /* must make even word boundary */
7759         goal_mtu &= 0xfffffffc;
7760         if (asoc->locked_on_sending) {
7761                 /* We are stuck on one stream until the message completes. */
7762                 strq = asoc->locked_on_sending;
7763                 locked = 1;
7764         } else {
7765                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7766                 locked = 0;
7767         }
7768         while ((goal_mtu > 0) && strq) {
7769                 giveup = 0;
7770                 bail = 0;
7771                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7772                     &giveup, eeor_mode, &bail, so_locked);
7773                 if (moved_how_much)
7774                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7775
7776                 if (locked) {
7777                         asoc->locked_on_sending = strq;
7778                         if ((moved_how_much == 0) || (giveup) || bail)
7779                                 /* no more to move for now */
7780                                 break;
7781                 } else {
7782                         asoc->locked_on_sending = NULL;
7783                         if ((giveup) || bail) {
7784                                 break;
7785                         }
7786                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7787                         if (strq == NULL) {
7788                                 break;
7789                         }
7790                 }
7791                 total_moved += moved_how_much;
7792                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7793                 goal_mtu &= 0xfffffffc;
7794         }
7795         if (bail)
7796                 *quit_now = 1;
7797
7798         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7799
7800         if (total_moved == 0) {
7801                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7802                     (net == stcb->asoc.primary_destination)) {
7803                         /* ran dry for primary network net */
7804                         SCTP_STAT_INCR(sctps_primary_randry);
7805                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7806                         /* ran dry with CMT on */
7807                         SCTP_STAT_INCR(sctps_cmt_randry);
7808                 }
7809         }
7810 }
7811
7812 void
7813 sctp_fix_ecn_echo(struct sctp_association *asoc)
7814 {
7815         struct sctp_tmit_chunk *chk;
7816
7817         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7818                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7819                         chk->sent = SCTP_DATAGRAM_UNSENT;
7820                 }
7821         }
7822 }
7823
7824 void
7825 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7826 {
7827         struct sctp_association *asoc;
7828         struct sctp_tmit_chunk *chk;
7829         struct sctp_stream_queue_pending *sp;
7830         unsigned int i;
7831
7832         if (net == NULL) {
7833                 return;
7834         }
7835         asoc = &stcb->asoc;
7836         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7837                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7838                         if (sp->net == net) {
7839                                 sctp_free_remote_addr(sp->net);
7840                                 sp->net = NULL;
7841                         }
7842                 }
7843         }
7844         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7845                 if (chk->whoTo == net) {
7846                         sctp_free_remote_addr(chk->whoTo);
7847                         chk->whoTo = NULL;
7848                 }
7849         }
7850 }
7851
7852 int
7853 sctp_med_chunk_output(struct sctp_inpcb *inp,
7854     struct sctp_tcb *stcb,
7855     struct sctp_association *asoc,
7856     int *num_out,
7857     int *reason_code,
7858     int control_only, int from_where,
7859     struct timeval *now, int *now_filled, int frag_point, int so_locked
7860 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7861     SCTP_UNUSED
7862 #endif
7863 )
7864 {
7865         /**
7866          * Ok this is the generic chunk service queue. we must do the
7867          * following:
7868          * - Service the stream queue that is next, moving any
7869          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7870          *   LAST to the out queue in one pass) and assigning TSN's. This
7871          *   only applys though if the peer does not support NDATA. For NDATA
7872          *   chunks its ok to not send the entire message ;-)
7873          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7874          *   fomulate and send the low level chunks. Making sure to combine
7875          *   any control in the control chunk queue also.
7876          */
7877         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7878         struct mbuf *outchain, *endoutchain;
7879         struct sctp_tmit_chunk *chk, *nchk;
7880
7881         /* temp arrays for unlinking */
7882         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7883         int no_fragmentflg, error;
7884         unsigned int max_rwnd_per_dest, max_send_per_dest;
7885         int one_chunk, hbflag, skip_data_for_this_net;
7886         int asconf, cookie, no_out_cnt;
7887         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7888         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7889         int tsns_sent = 0;
7890         uint32_t auth_offset = 0;
7891         struct sctp_auth_chunk *auth = NULL;
7892         uint16_t auth_keyid;
7893         int override_ok = 1;
7894         int skip_fill_up = 0;
7895         int data_auth_reqd = 0;
7896
7897         /*
7898          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7899          * destination.
7900          */
7901         int quit_now = 0;
7902
7903         *num_out = 0;
7904         *reason_code = 0;
7905         auth_keyid = stcb->asoc.authinfo.active_keyid;
7906         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7907             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7908             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7909                 eeor_mode = 1;
7910         } else {
7911                 eeor_mode = 0;
7912         }
7913         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7914         /*
7915          * First lets prime the pump. For each destination, if there is room
7916          * in the flight size, attempt to pull an MTU's worth out of the
7917          * stream queues into the general send_queue
7918          */
7919 #ifdef SCTP_AUDITING_ENABLED
7920         sctp_audit_log(0xC2, 2);
7921 #endif
7922         SCTP_TCB_LOCK_ASSERT(stcb);
7923         hbflag = 0;
7924         if (control_only)
7925                 no_data_chunks = 1;
7926         else
7927                 no_data_chunks = 0;
7928
7929         /* Nothing to possible to send? */
7930         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7931             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7932             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7933             TAILQ_EMPTY(&asoc->send_queue) &&
7934             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7935 nothing_to_send:
7936                 *reason_code = 9;
7937                 return (0);
7938         }
7939         if (asoc->peers_rwnd == 0) {
7940                 /* No room in peers rwnd */
7941                 *reason_code = 1;
7942                 if (asoc->total_flight > 0) {
7943                         /* we are allowed one chunk in flight */
7944                         no_data_chunks = 1;
7945                 }
7946         }
7947         if (stcb->asoc.ecn_echo_cnt_onq) {
7948                 /* Record where a sack goes, if any */
7949                 if (no_data_chunks &&
7950                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7951                         /* Nothing but ECNe to send - we don't do that */
7952                         goto nothing_to_send;
7953                 }
7954                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7955                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7956                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7957                                 sack_goes_to = chk->whoTo;
7958                                 break;
7959                         }
7960                 }
7961         }
7962         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7963         if (stcb->sctp_socket)
7964                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7965         else
7966                 max_send_per_dest = 0;
7967         if (no_data_chunks == 0) {
7968                 /* How many non-directed chunks are there? */
7969                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7970                         if (chk->whoTo == NULL) {
7971                                 /*
7972                                  * We already have non-directed chunks on
7973                                  * the queue, no need to do a fill-up.
7974                                  */
7975                                 skip_fill_up = 1;
7976                                 break;
7977                         }
7978                 }
7979
7980         }
7981         if ((no_data_chunks == 0) &&
7982             (skip_fill_up == 0) &&
7983             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7984                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7985                         /*
7986                          * This for loop we are in takes in each net, if
7987                          * its's got space in cwnd and has data sent to it
7988                          * (when CMT is off) then it calls
7989                          * sctp_fill_outqueue for the net. This gets data on
7990                          * the send queue for that network.
7991                          *
7992                          * In sctp_fill_outqueue TSN's are assigned and data is
7993                          * copied out of the stream buffers. Note mostly
7994                          * copy by reference (we hope).
7995                          */
7996                         net->window_probe = 0;
7997                         if ((net != stcb->asoc.alternate) &&
7998                             ((net->dest_state & SCTP_ADDR_PF) ||
7999                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
8000                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
8001                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8002                                         sctp_log_cwnd(stcb, net, 1,
8003                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8004                                 }
8005                                 continue;
8006                         }
8007                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
8008                             (net->flight_size == 0)) {
8009                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
8010                         }
8011                         if (net->flight_size >= net->cwnd) {
8012                                 /* skip this network, no room - can't fill */
8013                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8014                                         sctp_log_cwnd(stcb, net, 3,
8015                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8016                                 }
8017                                 continue;
8018                         }
8019                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8020                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8021                         }
8022                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
8023                         if (quit_now) {
8024                                 /* memory alloc failure */
8025                                 no_data_chunks = 1;
8026                                 break;
8027                         }
8028                 }
8029         }
8030         /* now service each destination and send out what we can for it */
8031         /* Nothing to send? */
8032         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8033             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8034             TAILQ_EMPTY(&asoc->send_queue)) {
8035                 *reason_code = 8;
8036                 return (0);
8037         }
8038         if (asoc->sctp_cmt_on_off > 0) {
8039                 /* get the last start point */
8040                 start_at = asoc->last_net_cmt_send_started;
8041                 if (start_at == NULL) {
8042                         /* null so to beginning */
8043                         start_at = TAILQ_FIRST(&asoc->nets);
8044                 } else {
8045                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8046                         if (start_at == NULL) {
8047                                 start_at = TAILQ_FIRST(&asoc->nets);
8048                         }
8049                 }
8050                 asoc->last_net_cmt_send_started = start_at;
8051         } else {
8052                 start_at = TAILQ_FIRST(&asoc->nets);
8053         }
8054         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8055                 if (chk->whoTo == NULL) {
8056                         if (asoc->alternate) {
8057                                 chk->whoTo = asoc->alternate;
8058                         } else {
8059                                 chk->whoTo = asoc->primary_destination;
8060                         }
8061                         atomic_add_int(&chk->whoTo->ref_count, 1);
8062                 }
8063         }
8064         old_start_at = NULL;
8065 again_one_more_time:
8066         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8067                 /* how much can we send? */
8068                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8069                 if (old_start_at && (old_start_at == net)) {
8070                         /* through list ocmpletely. */
8071                         break;
8072                 }
8073                 tsns_sent = 0xa;
8074                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8075                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8076                     (net->flight_size >= net->cwnd)) {
8077                         /*
8078                          * Nothing on control or asconf and flight is full,
8079                          * we can skip even in the CMT case.
8080                          */
8081                         continue;
8082                 }
8083                 bundle_at = 0;
8084                 endoutchain = outchain = NULL;
8085                 no_fragmentflg = 1;
8086                 one_chunk = 0;
8087                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8088                         skip_data_for_this_net = 1;
8089                 } else {
8090                         skip_data_for_this_net = 0;
8091                 }
8092                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8093 #ifdef INET
8094                 case AF_INET:
8095                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8096                         break;
8097 #endif
8098 #ifdef INET6
8099                 case AF_INET6:
8100                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8101                         break;
8102 #endif
8103                 default:
8104                         /* TSNH */
8105                         mtu = net->mtu;
8106                         break;
8107                 }
8108                 mx_mtu = mtu;
8109                 to_out = 0;
8110                 if (mtu > asoc->peers_rwnd) {
8111                         if (asoc->total_flight > 0) {
8112                                 /* We have a packet in flight somewhere */
8113                                 r_mtu = asoc->peers_rwnd;
8114                         } else {
8115                                 /* We are always allowed to send one MTU out */
8116                                 one_chunk = 1;
8117                                 r_mtu = mtu;
8118                         }
8119                 } else {
8120                         r_mtu = mtu;
8121                 }
8122                 error = 0;
8123                 /************************/
8124                 /* ASCONF transmission */
8125                 /************************/
8126                 /* Now first lets go through the asconf queue */
8127                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8128                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8129                                 continue;
8130                         }
8131                         if (chk->whoTo == NULL) {
8132                                 if (asoc->alternate == NULL) {
8133                                         if (asoc->primary_destination != net) {
8134                                                 break;
8135                                         }
8136                                 } else {
8137                                         if (asoc->alternate != net) {
8138                                                 break;
8139                                         }
8140                                 }
8141                         } else {
8142                                 if (chk->whoTo != net) {
8143                                         break;
8144                                 }
8145                         }
8146                         if (chk->data == NULL) {
8147                                 break;
8148                         }
8149                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8150                             chk->sent != SCTP_DATAGRAM_RESEND) {
8151                                 break;
8152                         }
8153                         /*
8154                          * if no AUTH is yet included and this chunk
8155                          * requires it, make sure to account for it.  We
8156                          * don't apply the size until the AUTH chunk is
8157                          * actually added below in case there is no room for
8158                          * this chunk. NOTE: we overload the use of "omtu"
8159                          * here
8160                          */
8161                         if ((auth == NULL) &&
8162                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8163                             stcb->asoc.peer_auth_chunks)) {
8164                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8165                         } else
8166                                 omtu = 0;
8167                         /* Here we do NOT factor the r_mtu */
8168                         if ((chk->send_size < (int)(mtu - omtu)) ||
8169                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8170                                 /*
8171                                  * We probably should glom the mbuf chain
8172                                  * from the chk->data for control but the
8173                                  * problem is it becomes yet one more level
8174                                  * of tracking to do if for some reason
8175                                  * output fails. Then I have got to
8176                                  * reconstruct the merged control chain.. el
8177                                  * yucko.. for now we take the easy way and
8178                                  * do the copy
8179                                  */
8180                                 /*
8181                                  * Add an AUTH chunk, if chunk requires it
8182                                  * save the offset into the chain for AUTH
8183                                  */
8184                                 if ((auth == NULL) &&
8185                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8186                                     stcb->asoc.peer_auth_chunks))) {
8187                                         outchain = sctp_add_auth_chunk(outchain,
8188                                             &endoutchain,
8189                                             &auth,
8190                                             &auth_offset,
8191                                             stcb,
8192                                             chk->rec.chunk_id.id);
8193                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8194                                 }
8195                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8196                                     (int)chk->rec.chunk_id.can_take_data,
8197                                     chk->send_size, chk->copy_by_ref);
8198                                 if (outchain == NULL) {
8199                                         *reason_code = 8;
8200                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8201                                         return (ENOMEM);
8202                                 }
8203                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8204                                 /* update our MTU size */
8205                                 if (mtu > (chk->send_size + omtu))
8206                                         mtu -= (chk->send_size + omtu);
8207                                 else
8208                                         mtu = 0;
8209                                 to_out += (chk->send_size + omtu);
8210                                 /* Do clear IP_DF ? */
8211                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8212                                         no_fragmentflg = 0;
8213                                 }
8214                                 if (chk->rec.chunk_id.can_take_data)
8215                                         chk->data = NULL;
8216                                 /*
8217                                  * set hb flag since we can use these for
8218                                  * RTO
8219                                  */
8220                                 hbflag = 1;
8221                                 asconf = 1;
8222                                 /*
8223                                  * should sysctl this: don't bundle data
8224                                  * with ASCONF since it requires AUTH
8225                                  */
8226                                 no_data_chunks = 1;
8227                                 chk->sent = SCTP_DATAGRAM_SENT;
8228                                 if (chk->whoTo == NULL) {
8229                                         chk->whoTo = net;
8230                                         atomic_add_int(&net->ref_count, 1);
8231                                 }
8232                                 chk->snd_count++;
8233                                 if (mtu == 0) {
8234                                         /*
8235                                          * Ok we are out of room but we can
8236                                          * output without effecting the
8237                                          * flight size since this little guy
8238                                          * is a control only packet.
8239                                          */
8240                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8241                                         /*
8242                                          * do NOT clear the asconf flag as
8243                                          * it is used to do appropriate
8244                                          * source address selection.
8245                                          */
8246                                         if (*now_filled == 0) {
8247                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8248                                                 *now_filled = 1;
8249                                         }
8250                                         net->last_sent_time = *now;
8251                                         hbflag = 0;
8252                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8253                                             (struct sockaddr *)&net->ro._l_addr,
8254                                             outchain, auth_offset, auth,
8255                                             stcb->asoc.authinfo.active_keyid,
8256                                             no_fragmentflg, 0, asconf,
8257                                             inp->sctp_lport, stcb->rport,
8258                                             htonl(stcb->asoc.peer_vtag),
8259                                             net->port, NULL,
8260                                             0, 0,
8261                                             so_locked))) {
8262                                                 /*
8263                                                  * error, we could not
8264                                                  * output
8265                                                  */
8266                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8267                                                 if (from_where == 0) {
8268                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8269                                                 }
8270                                                 if (error == ENOBUFS) {
8271                                                         asoc->ifp_had_enobuf = 1;
8272                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8273                                                 }
8274                                                 /* error, could not output */
8275                                                 if (error == EHOSTUNREACH) {
8276                                                         /*
8277                                                          * Destination went
8278                                                          * unreachable
8279                                                          * during this send
8280                                                          */
8281                                                         sctp_move_chunks_from_net(stcb, net);
8282                                                 }
8283                                                 *reason_code = 7;
8284                                                 break;
8285                                         } else {
8286                                                 asoc->ifp_had_enobuf = 0;
8287                                         }
8288                                         /*
8289                                          * increase the number we sent, if a
8290                                          * cookie is sent we don't tell them
8291                                          * any was sent out.
8292                                          */
8293                                         outchain = endoutchain = NULL;
8294                                         auth = NULL;
8295                                         auth_offset = 0;
8296                                         if (!no_out_cnt)
8297                                                 *num_out += ctl_cnt;
8298                                         /* recalc a clean slate and setup */
8299                                         switch (net->ro._l_addr.sa.sa_family) {
8300 #ifdef INET
8301                                         case AF_INET:
8302                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8303                                                 break;
8304 #endif
8305 #ifdef INET6
8306                                         case AF_INET6:
8307                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8308                                                 break;
8309 #endif
8310                                         default:
8311                                                 /* TSNH */
8312                                                 mtu = net->mtu;
8313                                                 break;
8314                                         }
8315                                         to_out = 0;
8316                                         no_fragmentflg = 1;
8317                                 }
8318                         }
8319                 }
8320                 if (error != 0) {
8321                         /* try next net */
8322                         continue;
8323                 }
8324                 /************************/
8325                 /* Control transmission */
8326                 /************************/
8327                 /* Now first lets go through the control queue */
8328                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8329                         if ((sack_goes_to) &&
8330                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8331                             (chk->whoTo != sack_goes_to)) {
8332                                 /*
8333                                  * if we have a sack in queue, and we are
8334                                  * looking at an ecn echo that is NOT queued
8335                                  * to where the sack is going..
8336                                  */
8337                                 if (chk->whoTo == net) {
8338                                         /*
8339                                          * Don't transmit it to where its
8340                                          * going (current net)
8341                                          */
8342                                         continue;
8343                                 } else if (sack_goes_to == net) {
8344                                         /*
8345                                          * But do transmit it to this
8346                                          * address
8347                                          */
8348                                         goto skip_net_check;
8349                                 }
8350                         }
8351                         if (chk->whoTo == NULL) {
8352                                 if (asoc->alternate == NULL) {
8353                                         if (asoc->primary_destination != net) {
8354                                                 continue;
8355                                         }
8356                                 } else {
8357                                         if (asoc->alternate != net) {
8358                                                 continue;
8359                                         }
8360                                 }
8361                         } else {
8362                                 if (chk->whoTo != net) {
8363                                         continue;
8364                                 }
8365                         }
8366         skip_net_check:
8367                         if (chk->data == NULL) {
8368                                 continue;
8369                         }
8370                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8371                                 /*
8372                                  * It must be unsent. Cookies and ASCONF's
8373                                  * hang around but there timers will force
8374                                  * when marked for resend.
8375                                  */
8376                                 continue;
8377                         }
8378                         /*
8379                          * if no AUTH is yet included and this chunk
8380                          * requires it, make sure to account for it.  We
8381                          * don't apply the size until the AUTH chunk is
8382                          * actually added below in case there is no room for
8383                          * this chunk. NOTE: we overload the use of "omtu"
8384                          * here
8385                          */
8386                         if ((auth == NULL) &&
8387                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8388                             stcb->asoc.peer_auth_chunks)) {
8389                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8390                         } else
8391                                 omtu = 0;
8392                         /* Here we do NOT factor the r_mtu */
8393                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8394                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8395                                 /*
8396                                  * We probably should glom the mbuf chain
8397                                  * from the chk->data for control but the
8398                                  * problem is it becomes yet one more level
8399                                  * of tracking to do if for some reason
8400                                  * output fails. Then I have got to
8401                                  * reconstruct the merged control chain.. el
8402                                  * yucko.. for now we take the easy way and
8403                                  * do the copy
8404                                  */
8405                                 /*
8406                                  * Add an AUTH chunk, if chunk requires it
8407                                  * save the offset into the chain for AUTH
8408                                  */
8409                                 if ((auth == NULL) &&
8410                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8411                                     stcb->asoc.peer_auth_chunks))) {
8412                                         outchain = sctp_add_auth_chunk(outchain,
8413                                             &endoutchain,
8414                                             &auth,
8415                                             &auth_offset,
8416                                             stcb,
8417                                             chk->rec.chunk_id.id);
8418                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8419                                 }
8420                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8421                                     (int)chk->rec.chunk_id.can_take_data,
8422                                     chk->send_size, chk->copy_by_ref);
8423                                 if (outchain == NULL) {
8424                                         *reason_code = 8;
8425                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8426                                         return (ENOMEM);
8427                                 }
8428                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8429                                 /* update our MTU size */
8430                                 if (mtu > (chk->send_size + omtu))
8431                                         mtu -= (chk->send_size + omtu);
8432                                 else
8433                                         mtu = 0;
8434                                 to_out += (chk->send_size + omtu);
8435                                 /* Do clear IP_DF ? */
8436                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8437                                         no_fragmentflg = 0;
8438                                 }
8439                                 if (chk->rec.chunk_id.can_take_data)
8440                                         chk->data = NULL;
8441                                 /* Mark things to be removed, if needed */
8442                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8443                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8444                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8445                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8446                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8447                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8448                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8449                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8450                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8451                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8452                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8453                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8454                                                 hbflag = 1;
8455                                         }
8456                                         /* remove these chunks at the end */
8457                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8458                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8459                                                 /* turn off the timer */
8460                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8461                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8462                                                             inp, stcb, net,
8463                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8464                                                 }
8465                                         }
8466                                         ctl_cnt++;
8467                                 } else {
8468                                         /*
8469                                          * Other chunks, since they have
8470                                          * timers running (i.e. COOKIE) we
8471                                          * just "trust" that it gets sent or
8472                                          * retransmitted.
8473                                          */
8474                                         ctl_cnt++;
8475                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8476                                                 cookie = 1;
8477                                                 no_out_cnt = 1;
8478                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8479                                                 /*
8480                                                  * Increment ecne send count
8481                                                  * here this means we may be
8482                                                  * over-zealous in our
8483                                                  * counting if the send
8484                                                  * fails, but its the best
8485                                                  * place to do it (we used
8486                                                  * to do it in the queue of
8487                                                  * the chunk, but that did
8488                                                  * not tell how many times
8489                                                  * it was sent.
8490                                                  */
8491                                                 SCTP_STAT_INCR(sctps_sendecne);
8492                                         }
8493                                         chk->sent = SCTP_DATAGRAM_SENT;
8494                                         if (chk->whoTo == NULL) {
8495                                                 chk->whoTo = net;
8496                                                 atomic_add_int(&net->ref_count, 1);
8497                                         }
8498                                         chk->snd_count++;
8499                                 }
8500                                 if (mtu == 0) {
8501                                         /*
8502                                          * Ok we are out of room but we can
8503                                          * output without effecting the
8504                                          * flight size since this little guy
8505                                          * is a control only packet.
8506                                          */
8507                                         if (asconf) {
8508                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8509                                                 /*
8510                                                  * do NOT clear the asconf
8511                                                  * flag as it is used to do
8512                                                  * appropriate source
8513                                                  * address selection.
8514                                                  */
8515                                         }
8516                                         if (cookie) {
8517                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8518                                                 cookie = 0;
8519                                         }
8520                                         /* Only HB or ASCONF advances time */
8521                                         if (hbflag) {
8522                                                 if (*now_filled == 0) {
8523                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8524                                                         *now_filled = 1;
8525                                                 }
8526                                                 net->last_sent_time = *now;
8527                                                 hbflag = 0;
8528                                         }
8529                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8530                                             (struct sockaddr *)&net->ro._l_addr,
8531                                             outchain,
8532                                             auth_offset, auth,
8533                                             stcb->asoc.authinfo.active_keyid,
8534                                             no_fragmentflg, 0, asconf,
8535                                             inp->sctp_lport, stcb->rport,
8536                                             htonl(stcb->asoc.peer_vtag),
8537                                             net->port, NULL,
8538                                             0, 0,
8539                                             so_locked))) {
8540                                                 /*
8541                                                  * error, we could not
8542                                                  * output
8543                                                  */
8544                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8545                                                 if (from_where == 0) {
8546                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8547                                                 }
8548                                                 if (error == ENOBUFS) {
8549                                                         asoc->ifp_had_enobuf = 1;
8550                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8551                                                 }
8552                                                 if (error == EHOSTUNREACH) {
8553                                                         /*
8554                                                          * Destination went
8555                                                          * unreachable
8556                                                          * during this send
8557                                                          */
8558                                                         sctp_move_chunks_from_net(stcb, net);
8559                                                 }
8560                                                 *reason_code = 7;
8561                                                 break;
8562                                         } else {
8563                                                 asoc->ifp_had_enobuf = 0;
8564                                         }
8565                                         /*
8566                                          * increase the number we sent, if a
8567                                          * cookie is sent we don't tell them
8568                                          * any was sent out.
8569                                          */
8570                                         outchain = endoutchain = NULL;
8571                                         auth = NULL;
8572                                         auth_offset = 0;
8573                                         if (!no_out_cnt)
8574                                                 *num_out += ctl_cnt;
8575                                         /* recalc a clean slate and setup */
8576                                         switch (net->ro._l_addr.sa.sa_family) {
8577 #ifdef INET
8578                                         case AF_INET:
8579                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8580                                                 break;
8581 #endif
8582 #ifdef INET6
8583                                         case AF_INET6:
8584                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8585                                                 break;
8586 #endif
8587                                         default:
8588                                                 /* TSNH */
8589                                                 mtu = net->mtu;
8590                                                 break;
8591                                         }
8592                                         to_out = 0;
8593                                         no_fragmentflg = 1;
8594                                 }
8595                         }
8596                 }
8597                 if (error != 0) {
8598                         /* try next net */
8599                         continue;
8600                 }
8601                 /* JRI: if dest is in PF state, do not send data to it */
8602                 if ((asoc->sctp_cmt_on_off > 0) &&
8603                     (net != stcb->asoc.alternate) &&
8604                     (net->dest_state & SCTP_ADDR_PF)) {
8605                         goto no_data_fill;
8606                 }
8607                 if (net->flight_size >= net->cwnd) {
8608                         goto no_data_fill;
8609                 }
8610                 if ((asoc->sctp_cmt_on_off > 0) &&
8611                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8612                     (net->flight_size > max_rwnd_per_dest)) {
8613                         goto no_data_fill;
8614                 }
8615                 /*
8616                  * We need a specific accounting for the usage of the send
8617                  * buffer. We also need to check the number of messages per
8618                  * net. For now, this is better than nothing and it disabled
8619                  * by default...
8620                  */
8621                 if ((asoc->sctp_cmt_on_off > 0) &&
8622                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8623                     (max_send_per_dest > 0) &&
8624                     (net->flight_size > max_send_per_dest)) {
8625                         goto no_data_fill;
8626                 }
8627                 /*********************/
8628                 /* Data transmission */
8629                 /*********************/
8630                 /*
8631                  * if AUTH for DATA is required and no AUTH has been added
8632                  * yet, account for this in the mtu now... if no data can be
8633                  * bundled, this adjustment won't matter anyways since the
8634                  * packet will be going out...
8635                  */
8636                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8637                     stcb->asoc.peer_auth_chunks);
8638                 if (data_auth_reqd && (auth == NULL)) {
8639                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8640                 }
8641                 /* now lets add any data within the MTU constraints */
8642                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8643 #ifdef INET
8644                 case AF_INET:
8645                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8646                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8647                         else
8648                                 omtu = 0;
8649                         break;
8650 #endif
8651 #ifdef INET6
8652                 case AF_INET6:
8653                         if (net->mtu > SCTP_MIN_OVERHEAD)
8654                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8655                         else
8656                                 omtu = 0;
8657                         break;
8658 #endif
8659                 default:
8660                         /* TSNH */
8661                         omtu = 0;
8662                         break;
8663                 }
8664                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8665                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8666                     (skip_data_for_this_net == 0)) ||
8667                     (cookie)) {
8668                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8669                                 if (no_data_chunks) {
8670                                         /* let only control go out */
8671                                         *reason_code = 1;
8672                                         break;
8673                                 }
8674                                 if (net->flight_size >= net->cwnd) {
8675                                         /* skip this net, no room for data */
8676                                         *reason_code = 2;
8677                                         break;
8678                                 }
8679                                 if ((chk->whoTo != NULL) &&
8680                                     (chk->whoTo != net)) {
8681                                         /* Don't send the chunk on this net */
8682                                         continue;
8683                                 }
8684                                 if (asoc->sctp_cmt_on_off == 0) {
8685                                         if ((asoc->alternate) &&
8686                                             (asoc->alternate != net) &&
8687                                             (chk->whoTo == NULL)) {
8688                                                 continue;
8689                                         } else if ((net != asoc->primary_destination) &&
8690                                                     (asoc->alternate == NULL) &&
8691                                             (chk->whoTo == NULL)) {
8692                                                 continue;
8693                                         }
8694                                 }
8695                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8696                                         /*-
8697                                          * strange, we have a chunk that is
8698                                          * to big for its destination and
8699                                          * yet no fragment ok flag.
8700                                          * Something went wrong when the
8701                                          * PMTU changed...we did not mark
8702                                          * this chunk for some reason?? I
8703                                          * will fix it here by letting IP
8704                                          * fragment it for now and printing
8705                                          * a warning. This really should not
8706                                          * happen ...
8707                                          */
8708                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8709                                             chk->send_size, mtu);
8710                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8711                                 }
8712                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8713                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8714                                         struct sctp_data_chunk *dchkh;
8715
8716                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8717                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8718                                 }
8719                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8720                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8721                                         /* ok we will add this one */
8722
8723                                         /*
8724                                          * Add an AUTH chunk, if chunk
8725                                          * requires it, save the offset into
8726                                          * the chain for AUTH
8727                                          */
8728                                         if (data_auth_reqd) {
8729                                                 if (auth == NULL) {
8730                                                         outchain = sctp_add_auth_chunk(outchain,
8731                                                             &endoutchain,
8732                                                             &auth,
8733                                                             &auth_offset,
8734                                                             stcb,
8735                                                             SCTP_DATA);
8736                                                         auth_keyid = chk->auth_keyid;
8737                                                         override_ok = 0;
8738                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8739                                                 } else if (override_ok) {
8740                                                         /*
8741                                                          * use this data's
8742                                                          * keyid
8743                                                          */
8744                                                         auth_keyid = chk->auth_keyid;
8745                                                         override_ok = 0;
8746                                                 } else if (auth_keyid != chk->auth_keyid) {
8747                                                         /*
8748                                                          * different keyid,
8749                                                          * so done bundling
8750                                                          */
8751                                                         break;
8752                                                 }
8753                                         }
8754                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8755                                             chk->send_size, chk->copy_by_ref);
8756                                         if (outchain == NULL) {
8757                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8758                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8759                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8760                                                 }
8761                                                 *reason_code = 3;
8762                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8763                                                 return (ENOMEM);
8764                                         }
8765                                         /* upate our MTU size */
8766                                         /* Do clear IP_DF ? */
8767                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8768                                                 no_fragmentflg = 0;
8769                                         }
8770                                         /* unsigned subtraction of mtu */
8771                                         if (mtu > chk->send_size)
8772                                                 mtu -= chk->send_size;
8773                                         else
8774                                                 mtu = 0;
8775                                         /* unsigned subtraction of r_mtu */
8776                                         if (r_mtu > chk->send_size)
8777                                                 r_mtu -= chk->send_size;
8778                                         else
8779                                                 r_mtu = 0;
8780
8781                                         to_out += chk->send_size;
8782                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8783 #ifdef INVARIANTS
8784                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8785 #else
8786                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8787                                                     mx_mtu, to_out);
8788 #endif
8789                                         }
8790                                         chk->window_probe = 0;
8791                                         data_list[bundle_at++] = chk;
8792                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8793                                                 break;
8794                                         }
8795                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8796                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8797                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8798                                                 } else {
8799                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8800                                                 }
8801                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8802                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8803                                                         /*
8804                                                          * Count number of
8805                                                          * user msg's that
8806                                                          * were fragmented
8807                                                          * we do this by
8808                                                          * counting when we
8809                                                          * see a LAST
8810                                                          * fragment only.
8811                                                          */
8812                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8813                                         }
8814                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8815                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8816                                                         data_list[0]->window_probe = 1;
8817                                                         net->window_probe = 1;
8818                                                 }
8819                                                 break;
8820                                         }
8821                                 } else {
8822                                         /*
8823                                          * Must be sent in order of the
8824                                          * TSN's (on a network)
8825                                          */
8826                                         break;
8827                                 }
8828                         }       /* for (chunk gather loop for this net) */
8829                 }               /* if asoc.state OPEN */
8830 no_data_fill:
8831                 /* Is there something to send for this destination? */
8832                 if (outchain) {
8833                         /* We may need to start a control timer or two */
8834                         if (asconf) {
8835                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8836                                     stcb, net);
8837                                 /*
8838                                  * do NOT clear the asconf flag as it is
8839                                  * used to do appropriate source address
8840                                  * selection.
8841                                  */
8842                         }
8843                         if (cookie) {
8844                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8845                                 cookie = 0;
8846                         }
8847                         /* must start a send timer if data is being sent */
8848                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8849                                 /*
8850                                  * no timer running on this destination
8851                                  * restart it.
8852                                  */
8853                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8854                         }
8855                         if (bundle_at || hbflag) {
8856                                 /* For data/asconf and hb set time */
8857                                 if (*now_filled == 0) {
8858                                         (void)SCTP_GETTIME_TIMEVAL(now);
8859                                         *now_filled = 1;
8860                                 }
8861                                 net->last_sent_time = *now;
8862                         }
8863                         /* Now send it, if there is anything to send :> */
8864                         if ((error = sctp_lowlevel_chunk_output(inp,
8865                             stcb,
8866                             net,
8867                             (struct sockaddr *)&net->ro._l_addr,
8868                             outchain,
8869                             auth_offset,
8870                             auth,
8871                             auth_keyid,
8872                             no_fragmentflg,
8873                             bundle_at,
8874                             asconf,
8875                             inp->sctp_lport, stcb->rport,
8876                             htonl(stcb->asoc.peer_vtag),
8877                             net->port, NULL,
8878                             0, 0,
8879                             so_locked))) {
8880                                 /* error, we could not output */
8881                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8882                                 if (from_where == 0) {
8883                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8884                                 }
8885                                 if (error == ENOBUFS) {
8886                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8887                                         asoc->ifp_had_enobuf = 1;
8888                                 }
8889                                 if (error == EHOSTUNREACH) {
8890                                         /*
8891                                          * Destination went unreachable
8892                                          * during this send
8893                                          */
8894                                         sctp_move_chunks_from_net(stcb, net);
8895                                 }
8896                                 *reason_code = 6;
8897                                 /*-
8898                                  * I add this line to be paranoid. As far as
8899                                  * I can tell the continue, takes us back to
8900                                  * the top of the for, but just to make sure
8901                                  * I will reset these again here.
8902                                  */
8903                                 ctl_cnt = bundle_at = 0;
8904                                 continue;       /* This takes us back to the
8905                                                  * for() for the nets. */
8906                         } else {
8907                                 asoc->ifp_had_enobuf = 0;
8908                         }
8909                         endoutchain = NULL;
8910                         auth = NULL;
8911                         auth_offset = 0;
8912                         if (!no_out_cnt) {
8913                                 *num_out += (ctl_cnt + bundle_at);
8914                         }
8915                         if (bundle_at) {
8916                                 /* setup for a RTO measurement */
8917                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8918                                 /* fill time if not already filled */
8919                                 if (*now_filled == 0) {
8920                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8921                                         *now_filled = 1;
8922                                         *now = asoc->time_last_sent;
8923                                 } else {
8924                                         asoc->time_last_sent = *now;
8925                                 }
8926                                 if (net->rto_needed) {
8927                                         data_list[0]->do_rtt = 1;
8928                                         net->rto_needed = 0;
8929                                 }
8930                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8931                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8932                         }
8933                         if (one_chunk) {
8934                                 break;
8935                         }
8936                 }
8937                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8938                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8939                 }
8940         }
8941         if (old_start_at == NULL) {
8942                 old_start_at = start_at;
8943                 start_at = TAILQ_FIRST(&asoc->nets);
8944                 if (old_start_at)
8945                         goto again_one_more_time;
8946         }
8947         /*
8948          * At the end there should be no NON timed chunks hanging on this
8949          * queue.
8950          */
8951         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8952                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8953         }
8954         if ((*num_out == 0) && (*reason_code == 0)) {
8955                 *reason_code = 4;
8956         } else {
8957                 *reason_code = 5;
8958         }
8959         sctp_clean_up_ctl(stcb, asoc, so_locked);
8960         return (0);
8961 }
8962
8963 void
8964 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8965 {
8966         /*-
8967          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8968          * the control chunk queue.
8969          */
8970         struct sctp_chunkhdr *hdr;
8971         struct sctp_tmit_chunk *chk;
8972         struct mbuf *mat, *last_mbuf;
8973         uint32_t chunk_length;
8974         uint16_t padding_length;
8975
8976         SCTP_TCB_LOCK_ASSERT(stcb);
8977         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8978         if (op_err == NULL) {
8979                 return;
8980         }
8981         last_mbuf = NULL;
8982         chunk_length = 0;
8983         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8984                 chunk_length += SCTP_BUF_LEN(mat);
8985                 if (SCTP_BUF_NEXT(mat) == NULL) {
8986                         last_mbuf = mat;
8987                 }
8988         }
8989         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8990                 sctp_m_freem(op_err);
8991                 return;
8992         }
8993         padding_length = chunk_length % 4;
8994         if (padding_length != 0) {
8995                 padding_length = 4 - padding_length;
8996         }
8997         if (padding_length != 0) {
8998                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8999                         sctp_m_freem(op_err);
9000                         return;
9001                 }
9002         }
9003         sctp_alloc_a_chunk(stcb, chk);
9004         if (chk == NULL) {
9005                 /* no memory */
9006                 sctp_m_freem(op_err);
9007                 return;
9008         }
9009         chk->copy_by_ref = 0;
9010         chk->send_size = (uint16_t) chunk_length;
9011         chk->sent = SCTP_DATAGRAM_UNSENT;
9012         chk->snd_count = 0;
9013         chk->asoc = &stcb->asoc;
9014         chk->data = op_err;
9015         chk->whoTo = NULL;
9016         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
9017         chk->rec.chunk_id.can_take_data = 0;
9018         hdr = mtod(op_err, struct sctp_chunkhdr *);
9019         hdr->chunk_type = SCTP_OPERATION_ERROR;
9020         hdr->chunk_flags = 0;
9021         hdr->chunk_length = htons(chk->send_size);
9022         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9023         chk->asoc->ctrl_queue_cnt++;
9024 }
9025
9026 int
9027 sctp_send_cookie_echo(struct mbuf *m,
9028     int offset,
9029     struct sctp_tcb *stcb,
9030     struct sctp_nets *net)
9031 {
9032         /*-
9033          * pull out the cookie and put it at the front of the control chunk
9034          * queue.
9035          */
9036         int at;
9037         struct mbuf *cookie;
9038         struct sctp_paramhdr parm, *phdr;
9039         struct sctp_chunkhdr *hdr;
9040         struct sctp_tmit_chunk *chk;
9041         uint16_t ptype, plen;
9042
9043         SCTP_TCB_LOCK_ASSERT(stcb);
9044         /* First find the cookie in the param area */
9045         cookie = NULL;
9046         at = offset + sizeof(struct sctp_init_chunk);
9047         for (;;) {
9048                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
9049                 if (phdr == NULL) {
9050                         return (-3);
9051                 }
9052                 ptype = ntohs(phdr->param_type);
9053                 plen = ntohs(phdr->param_length);
9054                 if (ptype == SCTP_STATE_COOKIE) {
9055                         int pad;
9056
9057                         /* found the cookie */
9058                         if ((pad = (plen % 4))) {
9059                                 plen += 4 - pad;
9060                         }
9061                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9062                         if (cookie == NULL) {
9063                                 /* No memory */
9064                                 return (-2);
9065                         }
9066 #ifdef SCTP_MBUF_LOGGING
9067                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9068                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9069                         }
9070 #endif
9071                         break;
9072                 }
9073                 at += SCTP_SIZE32(plen);
9074         }
9075         /* ok, we got the cookie lets change it into a cookie echo chunk */
9076         /* first the change from param to cookie */
9077         hdr = mtod(cookie, struct sctp_chunkhdr *);
9078         hdr->chunk_type = SCTP_COOKIE_ECHO;
9079         hdr->chunk_flags = 0;
9080         /* get the chunk stuff now and place it in the FRONT of the queue */
9081         sctp_alloc_a_chunk(stcb, chk);
9082         if (chk == NULL) {
9083                 /* no memory */
9084                 sctp_m_freem(cookie);
9085                 return (-5);
9086         }
9087         chk->copy_by_ref = 0;
9088         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9089         chk->rec.chunk_id.can_take_data = 0;
9090         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9091         chk->send_size = plen;
9092         chk->sent = SCTP_DATAGRAM_UNSENT;
9093         chk->snd_count = 0;
9094         chk->asoc = &stcb->asoc;
9095         chk->data = cookie;
9096         chk->whoTo = net;
9097         atomic_add_int(&chk->whoTo->ref_count, 1);
9098         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9099         chk->asoc->ctrl_queue_cnt++;
9100         return (0);
9101 }
9102
9103 void
9104 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9105     struct mbuf *m,
9106     int offset,
9107     int chk_length,
9108     struct sctp_nets *net)
9109 {
9110         /*
9111          * take a HB request and make it into a HB ack and send it.
9112          */
9113         struct mbuf *outchain;
9114         struct sctp_chunkhdr *chdr;
9115         struct sctp_tmit_chunk *chk;
9116
9117
9118         if (net == NULL)
9119                 /* must have a net pointer */
9120                 return;
9121
9122         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9123         if (outchain == NULL) {
9124                 /* gak out of memory */
9125                 return;
9126         }
9127 #ifdef SCTP_MBUF_LOGGING
9128         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9129                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9130         }
9131 #endif
9132         chdr = mtod(outchain, struct sctp_chunkhdr *);
9133         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9134         chdr->chunk_flags = 0;
9135         if (chk_length % 4) {
9136                 /* need pad */
9137                 uint32_t cpthis = 0;
9138                 int padlen;
9139
9140                 padlen = 4 - (chk_length % 4);
9141                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9142         }
9143         sctp_alloc_a_chunk(stcb, chk);
9144         if (chk == NULL) {
9145                 /* no memory */
9146                 sctp_m_freem(outchain);
9147                 return;
9148         }
9149         chk->copy_by_ref = 0;
9150         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9151         chk->rec.chunk_id.can_take_data = 1;
9152         chk->flags = 0;
9153         chk->send_size = chk_length;
9154         chk->sent = SCTP_DATAGRAM_UNSENT;
9155         chk->snd_count = 0;
9156         chk->asoc = &stcb->asoc;
9157         chk->data = outchain;
9158         chk->whoTo = net;
9159         atomic_add_int(&chk->whoTo->ref_count, 1);
9160         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9161         chk->asoc->ctrl_queue_cnt++;
9162 }
9163
9164 void
9165 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9166 {
9167         /* formulate and queue a cookie-ack back to sender */
9168         struct mbuf *cookie_ack;
9169         struct sctp_chunkhdr *hdr;
9170         struct sctp_tmit_chunk *chk;
9171
9172         SCTP_TCB_LOCK_ASSERT(stcb);
9173
9174         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9175         if (cookie_ack == NULL) {
9176                 /* no mbuf's */
9177                 return;
9178         }
9179         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9180         sctp_alloc_a_chunk(stcb, chk);
9181         if (chk == NULL) {
9182                 /* no memory */
9183                 sctp_m_freem(cookie_ack);
9184                 return;
9185         }
9186         chk->copy_by_ref = 0;
9187         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9188         chk->rec.chunk_id.can_take_data = 1;
9189         chk->flags = 0;
9190         chk->send_size = sizeof(struct sctp_chunkhdr);
9191         chk->sent = SCTP_DATAGRAM_UNSENT;
9192         chk->snd_count = 0;
9193         chk->asoc = &stcb->asoc;
9194         chk->data = cookie_ack;
9195         if (chk->asoc->last_control_chunk_from != NULL) {
9196                 chk->whoTo = chk->asoc->last_control_chunk_from;
9197                 atomic_add_int(&chk->whoTo->ref_count, 1);
9198         } else {
9199                 chk->whoTo = NULL;
9200         }
9201         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9202         hdr->chunk_type = SCTP_COOKIE_ACK;
9203         hdr->chunk_flags = 0;
9204         hdr->chunk_length = htons(chk->send_size);
9205         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9206         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9207         chk->asoc->ctrl_queue_cnt++;
9208         return;
9209 }
9210
9211
9212 void
9213 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9214 {
9215         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9216         struct mbuf *m_shutdown_ack;
9217         struct sctp_shutdown_ack_chunk *ack_cp;
9218         struct sctp_tmit_chunk *chk;
9219
9220         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9221         if (m_shutdown_ack == NULL) {
9222                 /* no mbuf's */
9223                 return;
9224         }
9225         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9226         sctp_alloc_a_chunk(stcb, chk);
9227         if (chk == NULL) {
9228                 /* no memory */
9229                 sctp_m_freem(m_shutdown_ack);
9230                 return;
9231         }
9232         chk->copy_by_ref = 0;
9233         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9234         chk->rec.chunk_id.can_take_data = 1;
9235         chk->flags = 0;
9236         chk->send_size = sizeof(struct sctp_chunkhdr);
9237         chk->sent = SCTP_DATAGRAM_UNSENT;
9238         chk->snd_count = 0;
9239         chk->flags = 0;
9240         chk->asoc = &stcb->asoc;
9241         chk->data = m_shutdown_ack;
9242         chk->whoTo = net;
9243         if (chk->whoTo) {
9244                 atomic_add_int(&chk->whoTo->ref_count, 1);
9245         }
9246         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9247         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9248         ack_cp->ch.chunk_flags = 0;
9249         ack_cp->ch.chunk_length = htons(chk->send_size);
9250         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9251         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9252         chk->asoc->ctrl_queue_cnt++;
9253         return;
9254 }
9255
9256 void
9257 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9258 {
9259         /* formulate and queue a SHUTDOWN to the sender */
9260         struct mbuf *m_shutdown;
9261         struct sctp_shutdown_chunk *shutdown_cp;
9262         struct sctp_tmit_chunk *chk;
9263
9264         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9265         if (m_shutdown == NULL) {
9266                 /* no mbuf's */
9267                 return;
9268         }
9269         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9270         sctp_alloc_a_chunk(stcb, chk);
9271         if (chk == NULL) {
9272                 /* no memory */
9273                 sctp_m_freem(m_shutdown);
9274                 return;
9275         }
9276         chk->copy_by_ref = 0;
9277         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9278         chk->rec.chunk_id.can_take_data = 1;
9279         chk->flags = 0;
9280         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9281         chk->sent = SCTP_DATAGRAM_UNSENT;
9282         chk->snd_count = 0;
9283         chk->flags = 0;
9284         chk->asoc = &stcb->asoc;
9285         chk->data = m_shutdown;
9286         chk->whoTo = net;
9287         if (chk->whoTo) {
9288                 atomic_add_int(&chk->whoTo->ref_count, 1);
9289         }
9290         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9291         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9292         shutdown_cp->ch.chunk_flags = 0;
9293         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9294         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9295         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9296         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9297         chk->asoc->ctrl_queue_cnt++;
9298         return;
9299 }
9300
9301 void
9302 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9303 {
9304         /*
9305          * formulate and queue an ASCONF to the peer. ASCONF parameters
9306          * should be queued on the assoc queue.
9307          */
9308         struct sctp_tmit_chunk *chk;
9309         struct mbuf *m_asconf;
9310         int len;
9311
9312         SCTP_TCB_LOCK_ASSERT(stcb);
9313
9314         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9315             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9316                 /* can't send a new one if there is one in flight already */
9317                 return;
9318         }
9319         /* compose an ASCONF chunk, maximum length is PMTU */
9320         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9321         if (m_asconf == NULL) {
9322                 return;
9323         }
9324         sctp_alloc_a_chunk(stcb, chk);
9325         if (chk == NULL) {
9326                 /* no memory */
9327                 sctp_m_freem(m_asconf);
9328                 return;
9329         }
9330         chk->copy_by_ref = 0;
9331         chk->rec.chunk_id.id = SCTP_ASCONF;
9332         chk->rec.chunk_id.can_take_data = 0;
9333         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9334         chk->data = m_asconf;
9335         chk->send_size = len;
9336         chk->sent = SCTP_DATAGRAM_UNSENT;
9337         chk->snd_count = 0;
9338         chk->asoc = &stcb->asoc;
9339         chk->whoTo = net;
9340         if (chk->whoTo) {
9341                 atomic_add_int(&chk->whoTo->ref_count, 1);
9342         }
9343         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9344         chk->asoc->ctrl_queue_cnt++;
9345         return;
9346 }
9347
9348 void
9349 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9350 {
9351         /*
9352          * formulate and queue a asconf-ack back to sender. the asconf-ack
9353          * must be stored in the tcb.
9354          */
9355         struct sctp_tmit_chunk *chk;
9356         struct sctp_asconf_ack *ack, *latest_ack;
9357         struct mbuf *m_ack;
9358         struct sctp_nets *net = NULL;
9359
9360         SCTP_TCB_LOCK_ASSERT(stcb);
9361         /* Get the latest ASCONF-ACK */
9362         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9363         if (latest_ack == NULL) {
9364                 return;
9365         }
9366         if (latest_ack->last_sent_to != NULL &&
9367             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9368                 /* we're doing a retransmission */
9369                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9370                 if (net == NULL) {
9371                         /* no alternate */
9372                         if (stcb->asoc.last_control_chunk_from == NULL) {
9373                                 if (stcb->asoc.alternate) {
9374                                         net = stcb->asoc.alternate;
9375                                 } else {
9376                                         net = stcb->asoc.primary_destination;
9377                                 }
9378                         } else {
9379                                 net = stcb->asoc.last_control_chunk_from;
9380                         }
9381                 }
9382         } else {
9383                 /* normal case */
9384                 if (stcb->asoc.last_control_chunk_from == NULL) {
9385                         if (stcb->asoc.alternate) {
9386                                 net = stcb->asoc.alternate;
9387                         } else {
9388                                 net = stcb->asoc.primary_destination;
9389                         }
9390                 } else {
9391                         net = stcb->asoc.last_control_chunk_from;
9392                 }
9393         }
9394         latest_ack->last_sent_to = net;
9395
9396         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9397                 if (ack->data == NULL) {
9398                         continue;
9399                 }
9400                 /* copy the asconf_ack */
9401                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9402                 if (m_ack == NULL) {
9403                         /* couldn't copy it */
9404                         return;
9405                 }
9406 #ifdef SCTP_MBUF_LOGGING
9407                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9408                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9409                 }
9410 #endif
9411
9412                 sctp_alloc_a_chunk(stcb, chk);
9413                 if (chk == NULL) {
9414                         /* no memory */
9415                         if (m_ack)
9416                                 sctp_m_freem(m_ack);
9417                         return;
9418                 }
9419                 chk->copy_by_ref = 0;
9420                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9421                 chk->rec.chunk_id.can_take_data = 1;
9422                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9423                 chk->whoTo = net;
9424                 if (chk->whoTo) {
9425                         atomic_add_int(&chk->whoTo->ref_count, 1);
9426                 }
9427                 chk->data = m_ack;
9428                 chk->send_size = ack->len;
9429                 chk->sent = SCTP_DATAGRAM_UNSENT;
9430                 chk->snd_count = 0;
9431                 chk->asoc = &stcb->asoc;
9432
9433                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9434                 chk->asoc->ctrl_queue_cnt++;
9435         }
9436         return;
9437 }
9438
9439
9440 static int
9441 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9442     struct sctp_tcb *stcb,
9443     struct sctp_association *asoc,
9444     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9445 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9446     SCTP_UNUSED
9447 #endif
9448 )
9449 {
9450         /*-
9451          * send out one MTU of retransmission. If fast_retransmit is
9452          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9453          * rwnd. For a Cookie or Asconf in the control chunk queue we
9454          * retransmit them by themselves.
9455          *
9456          * For data chunks we will pick out the lowest TSN's in the sent_queue
9457          * marked for resend and bundle them all together (up to a MTU of
9458          * destination). The address to send to should have been
9459          * selected/changed where the retransmission was marked (i.e. in FR
9460          * or t3-timeout routines).
9461          */
9462         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9463         struct sctp_tmit_chunk *chk, *fwd;
9464         struct mbuf *m, *endofchain;
9465         struct sctp_nets *net = NULL;
9466         uint32_t tsns_sent = 0;
9467         int no_fragmentflg, bundle_at, cnt_thru;
9468         unsigned int mtu;
9469         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9470         struct sctp_auth_chunk *auth = NULL;
9471         uint32_t auth_offset = 0;
9472         uint16_t auth_keyid;
9473         int override_ok = 1;
9474         int data_auth_reqd = 0;
9475         uint32_t dmtu = 0;
9476
9477         SCTP_TCB_LOCK_ASSERT(stcb);
9478         tmr_started = ctl_cnt = bundle_at = error = 0;
9479         no_fragmentflg = 1;
9480         fwd_tsn = 0;
9481         *cnt_out = 0;
9482         fwd = NULL;
9483         endofchain = m = NULL;
9484         auth_keyid = stcb->asoc.authinfo.active_keyid;
9485 #ifdef SCTP_AUDITING_ENABLED
9486         sctp_audit_log(0xC3, 1);
9487 #endif
9488         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9489             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9490                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9491                     asoc->sent_queue_retran_cnt);
9492                 asoc->sent_queue_cnt = 0;
9493                 asoc->sent_queue_cnt_removeable = 0;
9494                 /* send back 0/0 so we enter normal transmission */
9495                 *cnt_out = 0;
9496                 return (0);
9497         }
9498         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9499                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9500                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9501                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9502                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9503                                 continue;
9504                         }
9505                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9506                                 if (chk != asoc->str_reset) {
9507                                         /*
9508                                          * not eligible for retran if its
9509                                          * not ours
9510                                          */
9511                                         continue;
9512                                 }
9513                         }
9514                         ctl_cnt++;
9515                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9516                                 fwd_tsn = 1;
9517                         }
9518                         /*
9519                          * Add an AUTH chunk, if chunk requires it save the
9520                          * offset into the chain for AUTH
9521                          */
9522                         if ((auth == NULL) &&
9523                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9524                             stcb->asoc.peer_auth_chunks))) {
9525                                 m = sctp_add_auth_chunk(m, &endofchain,
9526                                     &auth, &auth_offset,
9527                                     stcb,
9528                                     chk->rec.chunk_id.id);
9529                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9530                         }
9531                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9532                         break;
9533                 }
9534         }
9535         one_chunk = 0;
9536         cnt_thru = 0;
9537         /* do we have control chunks to retransmit? */
9538         if (m != NULL) {
9539                 /* Start a timer no matter if we suceed or fail */
9540                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9541                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9542                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9543                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9544                 chk->snd_count++;       /* update our count */
9545                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9546                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9547                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9548                     no_fragmentflg, 0, 0,
9549                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9550                     chk->whoTo->port, NULL,
9551                     0, 0,
9552                     so_locked))) {
9553                         SCTP_STAT_INCR(sctps_lowlevelerr);
9554                         return (error);
9555                 }
9556                 endofchain = NULL;
9557                 auth = NULL;
9558                 auth_offset = 0;
9559                 /*
9560                  * We don't want to mark the net->sent time here since this
9561                  * we use this for HB and retrans cannot measure RTT
9562                  */
9563                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9564                 *cnt_out += 1;
9565                 chk->sent = SCTP_DATAGRAM_SENT;
9566                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9567                 if (fwd_tsn == 0) {
9568                         return (0);
9569                 } else {
9570                         /* Clean up the fwd-tsn list */
9571                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9572                         return (0);
9573                 }
9574         }
9575         /*
9576          * Ok, it is just data retransmission we need to do or that and a
9577          * fwd-tsn with it all.
9578          */
9579         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9580                 return (SCTP_RETRAN_DONE);
9581         }
9582         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9583             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9584                 /* not yet open, resend the cookie and that is it */
9585                 return (1);
9586         }
9587 #ifdef SCTP_AUDITING_ENABLED
9588         sctp_auditing(20, inp, stcb, NULL);
9589 #endif
9590         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9591         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9592                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9593                         /* No, not sent to this net or not ready for rtx */
9594                         continue;
9595                 }
9596                 if (chk->data == NULL) {
9597                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9598                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9599                         continue;
9600                 }
9601                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9602                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9603                         struct mbuf *op_err;
9604                         char msg[SCTP_DIAG_INFO_LEN];
9605
9606                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9607                             chk->rec.data.TSN_seq, chk->snd_count);
9608                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9609                             msg);
9610                         atomic_add_int(&stcb->asoc.refcnt, 1);
9611                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9612                             so_locked);
9613                         SCTP_TCB_LOCK(stcb);
9614                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9615                         return (SCTP_RETRAN_EXIT);
9616                 }
9617                 /* pick up the net */
9618                 net = chk->whoTo;
9619                 switch (net->ro._l_addr.sa.sa_family) {
9620 #ifdef INET
9621                 case AF_INET:
9622                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9623                         break;
9624 #endif
9625 #ifdef INET6
9626                 case AF_INET6:
9627                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9628                         break;
9629 #endif
9630                 default:
9631                         /* TSNH */
9632                         mtu = net->mtu;
9633                         break;
9634                 }
9635
9636                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9637                         /* No room in peers rwnd */
9638                         uint32_t tsn;
9639
9640                         tsn = asoc->last_acked_seq + 1;
9641                         if (tsn == chk->rec.data.TSN_seq) {
9642                                 /*
9643                                  * we make a special exception for this
9644                                  * case. The peer has no rwnd but is missing
9645                                  * the lowest chunk.. which is probably what
9646                                  * is holding up the rwnd.
9647                                  */
9648                                 goto one_chunk_around;
9649                         }
9650                         return (1);
9651                 }
9652 one_chunk_around:
9653                 if (asoc->peers_rwnd < mtu) {
9654                         one_chunk = 1;
9655                         if ((asoc->peers_rwnd == 0) &&
9656                             (asoc->total_flight == 0)) {
9657                                 chk->window_probe = 1;
9658                                 chk->whoTo->window_probe = 1;
9659                         }
9660                 }
9661 #ifdef SCTP_AUDITING_ENABLED
9662                 sctp_audit_log(0xC3, 2);
9663 #endif
9664                 bundle_at = 0;
9665                 m = NULL;
9666                 net->fast_retran_ip = 0;
9667                 if (chk->rec.data.doing_fast_retransmit == 0) {
9668                         /*
9669                          * if no FR in progress skip destination that have
9670                          * flight_size > cwnd.
9671                          */
9672                         if (net->flight_size >= net->cwnd) {
9673                                 continue;
9674                         }
9675                 } else {
9676                         /*
9677                          * Mark the destination net to have FR recovery
9678                          * limits put on it.
9679                          */
9680                         *fr_done = 1;
9681                         net->fast_retran_ip = 1;
9682                 }
9683
9684                 /*
9685                  * if no AUTH is yet included and this chunk requires it,
9686                  * make sure to account for it.  We don't apply the size
9687                  * until the AUTH chunk is actually added below in case
9688                  * there is no room for this chunk.
9689                  */
9690                 if (data_auth_reqd && (auth == NULL)) {
9691                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9692                 } else
9693                         dmtu = 0;
9694
9695                 if ((chk->send_size <= (mtu - dmtu)) ||
9696                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9697                         /* ok we will add this one */
9698                         if (data_auth_reqd) {
9699                                 if (auth == NULL) {
9700                                         m = sctp_add_auth_chunk(m,
9701                                             &endofchain,
9702                                             &auth,
9703                                             &auth_offset,
9704                                             stcb,
9705                                             SCTP_DATA);
9706                                         auth_keyid = chk->auth_keyid;
9707                                         override_ok = 0;
9708                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9709                                 } else if (override_ok) {
9710                                         auth_keyid = chk->auth_keyid;
9711                                         override_ok = 0;
9712                                 } else if (chk->auth_keyid != auth_keyid) {
9713                                         /* different keyid, so done bundling */
9714                                         break;
9715                                 }
9716                         }
9717                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9718                         if (m == NULL) {
9719                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9720                                 return (ENOMEM);
9721                         }
9722                         /* Do clear IP_DF ? */
9723                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9724                                 no_fragmentflg = 0;
9725                         }
9726                         /* upate our MTU size */
9727                         if (mtu > (chk->send_size + dmtu))
9728                                 mtu -= (chk->send_size + dmtu);
9729                         else
9730                                 mtu = 0;
9731                         data_list[bundle_at++] = chk;
9732                         if (one_chunk && (asoc->total_flight <= 0)) {
9733                                 SCTP_STAT_INCR(sctps_windowprobed);
9734                         }
9735                 }
9736                 if (one_chunk == 0) {
9737                         /*
9738                          * now are there anymore forward from chk to pick
9739                          * up?
9740                          */
9741                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9742                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9743                                         /* Nope, not for retran */
9744                                         continue;
9745                                 }
9746                                 if (fwd->whoTo != net) {
9747                                         /* Nope, not the net in question */
9748                                         continue;
9749                                 }
9750                                 if (data_auth_reqd && (auth == NULL)) {
9751                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9752                                 } else
9753                                         dmtu = 0;
9754                                 if (fwd->send_size <= (mtu - dmtu)) {
9755                                         if (data_auth_reqd) {
9756                                                 if (auth == NULL) {
9757                                                         m = sctp_add_auth_chunk(m,
9758                                                             &endofchain,
9759                                                             &auth,
9760                                                             &auth_offset,
9761                                                             stcb,
9762                                                             SCTP_DATA);
9763                                                         auth_keyid = fwd->auth_keyid;
9764                                                         override_ok = 0;
9765                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9766                                                 } else if (override_ok) {
9767                                                         auth_keyid = fwd->auth_keyid;
9768                                                         override_ok = 0;
9769                                                 } else if (fwd->auth_keyid != auth_keyid) {
9770                                                         /*
9771                                                          * different keyid,
9772                                                          * so done bundling
9773                                                          */
9774                                                         break;
9775                                                 }
9776                                         }
9777                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9778                                         if (m == NULL) {
9779                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9780                                                 return (ENOMEM);
9781                                         }
9782                                         /* Do clear IP_DF ? */
9783                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9784                                                 no_fragmentflg = 0;
9785                                         }
9786                                         /* upate our MTU size */
9787                                         if (mtu > (fwd->send_size + dmtu))
9788                                                 mtu -= (fwd->send_size + dmtu);
9789                                         else
9790                                                 mtu = 0;
9791                                         data_list[bundle_at++] = fwd;
9792                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9793                                                 break;
9794                                         }
9795                                 } else {
9796                                         /* can't fit so we are done */
9797                                         break;
9798                                 }
9799                         }
9800                 }
9801                 /* Is there something to send for this destination? */
9802                 if (m) {
9803                         /*
9804                          * No matter if we fail/or suceed we should start a
9805                          * timer. A failure is like a lost IP packet :-)
9806                          */
9807                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9808                                 /*
9809                                  * no timer running on this destination
9810                                  * restart it.
9811                                  */
9812                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9813                                 tmr_started = 1;
9814                         }
9815                         /* Now lets send it, if there is anything to send :> */
9816                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9817                             (struct sockaddr *)&net->ro._l_addr, m,
9818                             auth_offset, auth, auth_keyid,
9819                             no_fragmentflg, 0, 0,
9820                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9821                             net->port, NULL,
9822                             0, 0,
9823                             so_locked))) {
9824                                 /* error, we could not output */
9825                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9826                                 return (error);
9827                         }
9828                         endofchain = NULL;
9829                         auth = NULL;
9830                         auth_offset = 0;
9831                         /* For HB's */
9832                         /*
9833                          * We don't want to mark the net->sent time here
9834                          * since this we use this for HB and retrans cannot
9835                          * measure RTT
9836                          */
9837                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9838
9839                         /* For auto-close */
9840                         cnt_thru++;
9841                         if (*now_filled == 0) {
9842                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9843                                 *now = asoc->time_last_sent;
9844                                 *now_filled = 1;
9845                         } else {
9846                                 asoc->time_last_sent = *now;
9847                         }
9848                         *cnt_out += bundle_at;
9849 #ifdef SCTP_AUDITING_ENABLED
9850                         sctp_audit_log(0xC4, bundle_at);
9851 #endif
9852                         if (bundle_at) {
9853                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9854                         }
9855                         for (i = 0; i < bundle_at; i++) {
9856                                 SCTP_STAT_INCR(sctps_sendretransdata);
9857                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9858                                 /*
9859                                  * When we have a revoked data, and we
9860                                  * retransmit it, then we clear the revoked
9861                                  * flag since this flag dictates if we
9862                                  * subtracted from the fs
9863                                  */
9864                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9865                                         /* Deflate the cwnd */
9866                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9867                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9868                                 }
9869                                 data_list[i]->snd_count++;
9870                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9871                                 /* record the time */
9872                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9873                                 if (data_list[i]->book_size_scale) {
9874                                         /*
9875                                          * need to double the book size on
9876                                          * this one
9877                                          */
9878                                         data_list[i]->book_size_scale = 0;
9879                                         /*
9880                                          * Since we double the booksize, we
9881                                          * must also double the output queue
9882                                          * size, since this get shrunk when
9883                                          * we free by this amount.
9884                                          */
9885                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9886                                         data_list[i]->book_size *= 2;
9887
9888
9889                                 } else {
9890                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9891                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9892                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9893                                         }
9894                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9895                                             (uint32_t) (data_list[i]->send_size +
9896                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9897                                 }
9898                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9899                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9900                                             data_list[i]->whoTo->flight_size,
9901                                             data_list[i]->book_size,
9902                                             (uint32_t) (uintptr_t) data_list[i]->whoTo,
9903                                             data_list[i]->rec.data.TSN_seq);
9904                                 }
9905                                 sctp_flight_size_increase(data_list[i]);
9906                                 sctp_total_flight_increase(stcb, data_list[i]);
9907                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9908                                         /* SWS sender side engages */
9909                                         asoc->peers_rwnd = 0;
9910                                 }
9911                                 if ((i == 0) &&
9912                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9913                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9914                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9915                                             (tmr_started == 0)) {
9916                                                 /*-
9917                                                  * ok we just fast-retrans'd
9918                                                  * the lowest TSN, i.e the
9919                                                  * first on the list. In
9920                                                  * this case we want to give
9921                                                  * some more time to get a
9922                                                  * SACK back without a
9923                                                  * t3-expiring.
9924                                                  */
9925                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9926                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9927                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9928                                         }
9929                                 }
9930                         }
9931                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9932                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9933                         }
9934 #ifdef SCTP_AUDITING_ENABLED
9935                         sctp_auditing(21, inp, stcb, NULL);
9936 #endif
9937                 } else {
9938                         /* None will fit */
9939                         return (1);
9940                 }
9941                 if (asoc->sent_queue_retran_cnt <= 0) {
9942                         /* all done we have no more to retran */
9943                         asoc->sent_queue_retran_cnt = 0;
9944                         break;
9945                 }
9946                 if (one_chunk) {
9947                         /* No more room in rwnd */
9948                         return (1);
9949                 }
9950                 /* stop the for loop here. we sent out a packet */
9951                 break;
9952         }
9953         return (0);
9954 }
9955
9956 static void
9957 sctp_timer_validation(struct sctp_inpcb *inp,
9958     struct sctp_tcb *stcb,
9959     struct sctp_association *asoc)
9960 {
9961         struct sctp_nets *net;
9962
9963         /* Validate that a timer is running somewhere */
9964         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9965                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9966                         /* Here is a timer */
9967                         return;
9968                 }
9969         }
9970         SCTP_TCB_LOCK_ASSERT(stcb);
9971         /* Gak, we did not have a timer somewhere */
9972         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9973         if (asoc->alternate) {
9974                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9975         } else {
9976                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9977         }
9978         return;
9979 }
9980
9981 void
9982 sctp_chunk_output(struct sctp_inpcb *inp,
9983     struct sctp_tcb *stcb,
9984     int from_where,
9985     int so_locked
9986 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9987     SCTP_UNUSED
9988 #endif
9989 )
9990 {
9991         /*-
9992          * Ok this is the generic chunk service queue. we must do the
9993          * following:
9994          * - See if there are retransmits pending, if so we must
9995          *   do these first.
9996          * - Service the stream queue that is next, moving any
9997          *   message (note I must get a complete message i.e.
9998          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9999          *   TSN's
10000          * - Check to see if the cwnd/rwnd allows any output, if so we
10001          *   go ahead and fomulate and send the low level chunks. Making sure
10002          *   to combine any control in the control chunk queue also.
10003          */
10004         struct sctp_association *asoc;
10005         struct sctp_nets *net;
10006         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10007         unsigned int burst_cnt = 0;
10008         struct timeval now;
10009         int now_filled = 0;
10010         int nagle_on;
10011         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10012         int un_sent = 0;
10013         int fr_done;
10014         unsigned int tot_frs = 0;
10015
10016         asoc = &stcb->asoc;
10017 do_it_again:
10018         /* The Nagle algorithm is only applied when handling a send call. */
10019         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10020                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10021                         nagle_on = 0;
10022                 } else {
10023                         nagle_on = 1;
10024                 }
10025         } else {
10026                 nagle_on = 0;
10027         }
10028         SCTP_TCB_LOCK_ASSERT(stcb);
10029
10030         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10031
10032         if ((un_sent <= 0) &&
10033             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10034             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10035             (asoc->sent_queue_retran_cnt == 0) &&
10036             (asoc->trigger_reset == 0)) {
10037                 /* Nothing to do unless there is something to be sent left */
10038                 return;
10039         }
10040         /*
10041          * Do we have something to send, data or control AND a sack timer
10042          * running, if so piggy-back the sack.
10043          */
10044         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10045                 sctp_send_sack(stcb, so_locked);
10046                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10047         }
10048         while (asoc->sent_queue_retran_cnt) {
10049                 /*-
10050                  * Ok, it is retransmission time only, we send out only ONE
10051                  * packet with a single call off to the retran code.
10052                  */
10053                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10054                         /*-
10055                          * Special hook for handling cookiess discarded
10056                          * by peer that carried data. Send cookie-ack only
10057                          * and then the next call with get the retran's.
10058                          */
10059                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10060                             from_where,
10061                             &now, &now_filled, frag_point, so_locked);
10062                         return;
10063                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10064                         /* if its not from a HB then do it */
10065                         fr_done = 0;
10066                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10067                         if (fr_done) {
10068                                 tot_frs++;
10069                         }
10070                 } else {
10071                         /*
10072                          * its from any other place, we don't allow retran
10073                          * output (only control)
10074                          */
10075                         ret = 1;
10076                 }
10077                 if (ret > 0) {
10078                         /* Can't send anymore */
10079                         /*-
10080                          * now lets push out control by calling med-level
10081                          * output once. this assures that we WILL send HB's
10082                          * if queued too.
10083                          */
10084                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10085                             from_where,
10086                             &now, &now_filled, frag_point, so_locked);
10087 #ifdef SCTP_AUDITING_ENABLED
10088                         sctp_auditing(8, inp, stcb, NULL);
10089 #endif
10090                         sctp_timer_validation(inp, stcb, asoc);
10091                         return;
10092                 }
10093                 if (ret < 0) {
10094                         /*-
10095                          * The count was off.. retran is not happening so do
10096                          * the normal retransmission.
10097                          */
10098 #ifdef SCTP_AUDITING_ENABLED
10099                         sctp_auditing(9, inp, stcb, NULL);
10100 #endif
10101                         if (ret == SCTP_RETRAN_EXIT) {
10102                                 return;
10103                         }
10104                         break;
10105                 }
10106                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10107                         /* Only one transmission allowed out of a timeout */
10108 #ifdef SCTP_AUDITING_ENABLED
10109                         sctp_auditing(10, inp, stcb, NULL);
10110 #endif
10111                         /* Push out any control */
10112                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10113                             &now, &now_filled, frag_point, so_locked);
10114                         return;
10115                 }
10116                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10117                         /* Hit FR burst limit */
10118                         return;
10119                 }
10120                 if ((num_out == 0) && (ret == 0)) {
10121                         /* No more retrans to send */
10122                         break;
10123                 }
10124         }
10125 #ifdef SCTP_AUDITING_ENABLED
10126         sctp_auditing(12, inp, stcb, NULL);
10127 #endif
10128         /* Check for bad destinations, if they exist move chunks around. */
10129         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10130                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10131                         /*-
10132                          * if possible move things off of this address we
10133                          * still may send below due to the dormant state but
10134                          * we try to find an alternate address to send to
10135                          * and if we have one we move all queued data on the
10136                          * out wheel to this alternate address.
10137                          */
10138                         if (net->ref_count > 1)
10139                                 sctp_move_chunks_from_net(stcb, net);
10140                 } else {
10141                         /*-
10142                          * if ((asoc->sat_network) || (net->addr_is_local))
10143                          * { burst_limit = asoc->max_burst *
10144                          * SCTP_SAT_NETWORK_BURST_INCR; }
10145                          */
10146                         if (asoc->max_burst > 0) {
10147                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10148                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10149                                                 /*
10150                                                  * JRS - Use the congestion
10151                                                  * control given in the
10152                                                  * congestion control module
10153                                                  */
10154                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10155                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10156                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10157                                                 }
10158                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10159                                         }
10160                                         net->fast_retran_ip = 0;
10161                                 } else {
10162                                         if (net->flight_size == 0) {
10163                                                 /*
10164                                                  * Should be decaying the
10165                                                  * cwnd here
10166                                                  */
10167                                                 ;
10168                                         }
10169                                 }
10170                         }
10171                 }
10172
10173         }
10174         burst_cnt = 0;
10175         do {
10176                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10177                     &reason_code, 0, from_where,
10178                     &now, &now_filled, frag_point, so_locked);
10179                 if (error) {
10180                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10181                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10182                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10183                         }
10184                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10185                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10186                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10187                         }
10188                         break;
10189                 }
10190                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10191
10192                 tot_out += num_out;
10193                 burst_cnt++;
10194                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10195                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10196                         if (num_out == 0) {
10197                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10198                         }
10199                 }
10200                 if (nagle_on) {
10201                         /*
10202                          * When the Nagle algorithm is used, look at how
10203                          * much is unsent, then if its smaller than an MTU
10204                          * and we have data in flight we stop, except if we
10205                          * are handling a fragmented user message.
10206                          */
10207                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10208                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10209                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10210                             (stcb->asoc.total_flight > 0) &&
10211                             ((stcb->asoc.locked_on_sending == NULL) ||
10212                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10213                                 break;
10214                         }
10215                 }
10216                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10217                     TAILQ_EMPTY(&asoc->send_queue) &&
10218                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10219                         /* Nothing left to send */
10220                         break;
10221                 }
10222                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10223                         /* Nothing left to send */
10224                         break;
10225                 }
10226         } while (num_out &&
10227             ((asoc->max_burst == 0) ||
10228             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10229             (burst_cnt < asoc->max_burst)));
10230
10231         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10232                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10233                         SCTP_STAT_INCR(sctps_maxburstqueued);
10234                         asoc->burst_limit_applied = 1;
10235                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10236                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10237                         }
10238                 } else {
10239                         asoc->burst_limit_applied = 0;
10240                 }
10241         }
10242         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10243                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10244         }
10245         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10246             tot_out);
10247
10248         /*-
10249          * Now we need to clean up the control chunk chain if a ECNE is on
10250          * it. It must be marked as UNSENT again so next call will continue
10251          * to send it until such time that we get a CWR, to remove it.
10252          */
10253         if (stcb->asoc.ecn_echo_cnt_onq)
10254                 sctp_fix_ecn_echo(asoc);
10255
10256         if (stcb->asoc.trigger_reset) {
10257                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10258                         goto do_it_again;
10259                 }
10260         }
10261         return;
10262 }
10263
10264
10265 int
10266 sctp_output(
10267     struct sctp_inpcb *inp,
10268     struct mbuf *m,
10269     struct sockaddr *addr,
10270     struct mbuf *control,
10271     struct thread *p,
10272     int flags)
10273 {
10274         if (inp == NULL) {
10275                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10276                 return (EINVAL);
10277         }
10278         if (inp->sctp_socket == NULL) {
10279                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10280                 return (EINVAL);
10281         }
10282         return (sctp_sosend(inp->sctp_socket,
10283             addr,
10284             (struct uio *)NULL,
10285             m,
10286             control,
10287             flags, p
10288             ));
10289 }
10290
10291 void
10292 send_forward_tsn(struct sctp_tcb *stcb,
10293     struct sctp_association *asoc)
10294 {
10295         struct sctp_tmit_chunk *chk;
10296         struct sctp_forward_tsn_chunk *fwdtsn;
10297         uint32_t advance_peer_ack_point;
10298         int old;
10299
10300         if (asoc->idata_supported) {
10301                 old = 0;
10302         } else {
10303                 old = 1;
10304         }
10305         SCTP_TCB_LOCK_ASSERT(stcb);
10306         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10307                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10308                         /* mark it to unsent */
10309                         chk->sent = SCTP_DATAGRAM_UNSENT;
10310                         chk->snd_count = 0;
10311                         /* Do we correct its output location? */
10312                         if (chk->whoTo) {
10313                                 sctp_free_remote_addr(chk->whoTo);
10314                                 chk->whoTo = NULL;
10315                         }
10316                         goto sctp_fill_in_rest;
10317                 }
10318         }
10319         /* Ok if we reach here we must build one */
10320         sctp_alloc_a_chunk(stcb, chk);
10321         if (chk == NULL) {
10322                 return;
10323         }
10324         asoc->fwd_tsn_cnt++;
10325         chk->copy_by_ref = 0;
10326         /*
10327          * We don't do the old thing here since this is used not for on-wire
10328          * but to tell if we are sending a fwd-tsn by the stack during
10329          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10330          */
10331         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10332         chk->rec.chunk_id.can_take_data = 0;
10333         chk->flags = 0;
10334         chk->asoc = asoc;
10335         chk->whoTo = NULL;
10336         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10337         if (chk->data == NULL) {
10338                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10339                 return;
10340         }
10341         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10342         chk->sent = SCTP_DATAGRAM_UNSENT;
10343         chk->snd_count = 0;
10344         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10345         asoc->ctrl_queue_cnt++;
10346 sctp_fill_in_rest:
10347         /*-
10348          * Here we go through and fill out the part that deals with
10349          * stream/seq of the ones we skip.
10350          */
10351         SCTP_BUF_LEN(chk->data) = 0;
10352         {
10353                 struct sctp_tmit_chunk *at, *tp1, *last;
10354                 struct sctp_strseq *strseq;
10355                 struct sctp_strseq_mid *strseq_m;
10356                 unsigned int cnt_of_space, i, ovh;
10357                 unsigned int space_needed;
10358                 unsigned int cnt_of_skipped = 0;
10359
10360                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10361                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10362                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10363                                 /* no more to look at */
10364                                 break;
10365                         }
10366                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10367                                 /* We don't report these */
10368                                 continue;
10369                         }
10370                         cnt_of_skipped++;
10371                 }
10372                 if (old) {
10373                         space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10374                             (cnt_of_skipped * sizeof(struct sctp_strseq)));
10375                 } else {
10376                         space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10377                             (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10378                 }
10379                 cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10380
10381                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10382                         ovh = SCTP_MIN_OVERHEAD;
10383                 } else {
10384                         ovh = SCTP_MIN_V4_OVERHEAD;
10385                 }
10386                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10387                         /* trim to a mtu size */
10388                         cnt_of_space = asoc->smallest_mtu - ovh;
10389                 }
10390                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10391                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10392                             0xff, 0, cnt_of_skipped,
10393                             asoc->advanced_peer_ack_point);
10394
10395                 }
10396                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10397                 if (cnt_of_space < space_needed) {
10398                         /*-
10399                          * ok we must trim down the chunk by lowering the
10400                          * advance peer ack point.
10401                          */
10402                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10403                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10404                                     0xff, 0xff, cnt_of_space,
10405                                     space_needed);
10406                         }
10407                         if (old) {
10408                                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10409                                 cnt_of_skipped /= sizeof(struct sctp_strseq);
10410                         } else {
10411                                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10412                                 cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10413                         }
10414                         /*-
10415                          * Go through and find the TSN that will be the one
10416                          * we report.
10417                          */
10418                         at = TAILQ_FIRST(&asoc->sent_queue);
10419                         if (at != NULL) {
10420                                 for (i = 0; i < cnt_of_skipped; i++) {
10421                                         tp1 = TAILQ_NEXT(at, sctp_next);
10422                                         if (tp1 == NULL) {
10423                                                 break;
10424                                         }
10425                                         at = tp1;
10426                                 }
10427                         }
10428                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10429                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10430                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10431                                     asoc->advanced_peer_ack_point);
10432                         }
10433                         last = at;
10434                         /*-
10435                          * last now points to last one I can report, update
10436                          * peer ack point
10437                          */
10438                         if (last)
10439                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10440                         if (old) {
10441                                 space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10442                                     cnt_of_skipped * sizeof(struct sctp_strseq);
10443                         } else {
10444                                 space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10445                                     cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10446                         }
10447                 }
10448                 chk->send_size = space_needed;
10449                 /* Setup the chunk */
10450                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10451                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10452                 fwdtsn->ch.chunk_flags = 0;
10453                 if (old) {
10454                         fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10455                 } else {
10456                         fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10457                 }
10458                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10459                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10460                 fwdtsn++;
10461                 /*-
10462                  * Move pointer to after the fwdtsn and transfer to the
10463                  * strseq pointer.
10464                  */
10465                 if (old) {
10466                         strseq = (struct sctp_strseq *)fwdtsn;
10467                 } else {
10468                         strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10469                 }
10470                 /*-
10471                  * Now populate the strseq list. This is done blindly
10472                  * without pulling out duplicate stream info. This is
10473                  * inefficent but won't harm the process since the peer will
10474                  * look at these in sequence and will thus release anything.
10475                  * It could mean we exceed the PMTU and chop off some that
10476                  * we could have included.. but this is unlikely (aka 1432/4
10477                  * would mean 300+ stream seq's would have to be reported in
10478                  * one FWD-TSN. With a bit of work we can later FIX this to
10479                  * optimize and pull out duplcates.. but it does add more
10480                  * overhead. So for now... not!
10481                  */
10482                 at = TAILQ_FIRST(&asoc->sent_queue);
10483                 for (i = 0; i < cnt_of_skipped; i++) {
10484                         tp1 = TAILQ_NEXT(at, sctp_next);
10485                         if (tp1 == NULL)
10486                                 break;
10487                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10488                                 /* We don't report these */
10489                                 i--;
10490                                 at = tp1;
10491                                 continue;
10492                         }
10493                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10494                                 at->rec.data.fwd_tsn_cnt = 0;
10495                         }
10496                         if (old) {
10497                                 strseq->stream = ntohs(at->rec.data.stream_number);
10498                                 strseq->sequence = ntohs(at->rec.data.stream_seq);
10499                                 strseq++;
10500                         } else {
10501                                 strseq_m->stream = ntohs(at->rec.data.stream_number);
10502                                 strseq_m->reserved = ntohs(0);
10503                                 strseq_m->msg_id = ntohl(at->rec.data.stream_seq);
10504                                 strseq_m++;
10505                         }
10506                         at = tp1;
10507                 }
10508         }
10509         return;
10510 }
10511
10512 void
10513 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10514 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10515     SCTP_UNUSED
10516 #endif
10517 )
10518 {
10519         /*-
10520          * Queue up a SACK or NR-SACK in the control queue.
10521          * We must first check to see if a SACK or NR-SACK is
10522          * somehow on the control queue.
10523          * If so, we will take and and remove the old one.
10524          */
10525         struct sctp_association *asoc;
10526         struct sctp_tmit_chunk *chk, *a_chk;
10527         struct sctp_sack_chunk *sack;
10528         struct sctp_nr_sack_chunk *nr_sack;
10529         struct sctp_gap_ack_block *gap_descriptor;
10530         const struct sack_track *selector;
10531         int mergeable = 0;
10532         int offset;
10533         caddr_t limit;
10534         uint32_t *dup;
10535         int limit_reached = 0;
10536         unsigned int i, siz, j;
10537         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10538         int num_dups = 0;
10539         int space_req;
10540         uint32_t highest_tsn;
10541         uint8_t flags;
10542         uint8_t type;
10543         uint8_t tsn_map;
10544
10545         if (stcb->asoc.nrsack_supported == 1) {
10546                 type = SCTP_NR_SELECTIVE_ACK;
10547         } else {
10548                 type = SCTP_SELECTIVE_ACK;
10549         }
10550         a_chk = NULL;
10551         asoc = &stcb->asoc;
10552         SCTP_TCB_LOCK_ASSERT(stcb);
10553         if (asoc->last_data_chunk_from == NULL) {
10554                 /* Hmm we never received anything */
10555                 return;
10556         }
10557         sctp_slide_mapping_arrays(stcb);
10558         sctp_set_rwnd(stcb, asoc);
10559         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10560                 if (chk->rec.chunk_id.id == type) {
10561                         /* Hmm, found a sack already on queue, remove it */
10562                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10563                         asoc->ctrl_queue_cnt--;
10564                         a_chk = chk;
10565                         if (a_chk->data) {
10566                                 sctp_m_freem(a_chk->data);
10567                                 a_chk->data = NULL;
10568                         }
10569                         if (a_chk->whoTo) {
10570                                 sctp_free_remote_addr(a_chk->whoTo);
10571                                 a_chk->whoTo = NULL;
10572                         }
10573                         break;
10574                 }
10575         }
10576         if (a_chk == NULL) {
10577                 sctp_alloc_a_chunk(stcb, a_chk);
10578                 if (a_chk == NULL) {
10579                         /* No memory so we drop the idea, and set a timer */
10580                         if (stcb->asoc.delayed_ack) {
10581                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10582                                     stcb->sctp_ep, stcb, NULL,
10583                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10584                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10585                                     stcb->sctp_ep, stcb, NULL);
10586                         } else {
10587                                 stcb->asoc.send_sack = 1;
10588                         }
10589                         return;
10590                 }
10591                 a_chk->copy_by_ref = 0;
10592                 a_chk->rec.chunk_id.id = type;
10593                 a_chk->rec.chunk_id.can_take_data = 1;
10594         }
10595         /* Clear our pkt counts */
10596         asoc->data_pkts_seen = 0;
10597
10598         a_chk->flags = 0;
10599         a_chk->asoc = asoc;
10600         a_chk->snd_count = 0;
10601         a_chk->send_size = 0;   /* fill in later */
10602         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10603         a_chk->whoTo = NULL;
10604
10605         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10606                 /*-
10607                  * Ok, the destination for the SACK is unreachable, lets see if
10608                  * we can select an alternate to asoc->last_data_chunk_from
10609                  */
10610                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10611                 if (a_chk->whoTo == NULL) {
10612                         /* Nope, no alternate */
10613                         a_chk->whoTo = asoc->last_data_chunk_from;
10614                 }
10615         } else {
10616                 a_chk->whoTo = asoc->last_data_chunk_from;
10617         }
10618         if (a_chk->whoTo) {
10619                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10620         }
10621         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10622                 highest_tsn = asoc->highest_tsn_inside_map;
10623         } else {
10624                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10625         }
10626         if (highest_tsn == asoc->cumulative_tsn) {
10627                 /* no gaps */
10628                 if (type == SCTP_SELECTIVE_ACK) {
10629                         space_req = sizeof(struct sctp_sack_chunk);
10630                 } else {
10631                         space_req = sizeof(struct sctp_nr_sack_chunk);
10632                 }
10633         } else {
10634                 /* gaps get a cluster */
10635                 space_req = MCLBYTES;
10636         }
10637         /* Ok now lets formulate a MBUF with our sack */
10638         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10639         if ((a_chk->data == NULL) ||
10640             (a_chk->whoTo == NULL)) {
10641                 /* rats, no mbuf memory */
10642                 if (a_chk->data) {
10643                         /* was a problem with the destination */
10644                         sctp_m_freem(a_chk->data);
10645                         a_chk->data = NULL;
10646                 }
10647                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10648                 /* sa_ignore NO_NULL_CHK */
10649                 if (stcb->asoc.delayed_ack) {
10650                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10651                             stcb->sctp_ep, stcb, NULL,
10652                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10653                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10654                             stcb->sctp_ep, stcb, NULL);
10655                 } else {
10656                         stcb->asoc.send_sack = 1;
10657                 }
10658                 return;
10659         }
10660         /* ok, lets go through and fill it in */
10661         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10662         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10663         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10664                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10665         }
10666         limit = mtod(a_chk->data, caddr_t);
10667         limit += space;
10668
10669         flags = 0;
10670
10671         if ((asoc->sctp_cmt_on_off > 0) &&
10672             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10673                 /*-
10674                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10675                  * received, then set high bit to 1, else 0. Reset
10676                  * pkts_rcvd.
10677                  */
10678                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10679                 asoc->cmt_dac_pkts_rcvd = 0;
10680         }
10681 #ifdef SCTP_ASOCLOG_OF_TSNS
10682         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10683         stcb->asoc.cumack_log_atsnt++;
10684         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10685                 stcb->asoc.cumack_log_atsnt = 0;
10686         }
10687 #endif
10688         /* reset the readers interpretation */
10689         stcb->freed_by_sorcv_sincelast = 0;
10690
10691         if (type == SCTP_SELECTIVE_ACK) {
10692                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10693                 nr_sack = NULL;
10694                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10695                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10696                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10697                 } else {
10698                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10699                 }
10700         } else {
10701                 sack = NULL;
10702                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10703                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10704                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10705                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10706                 } else {
10707                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10708                 }
10709         }
10710
10711         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10712                 offset = 1;
10713         } else {
10714                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10715         }
10716         if (((type == SCTP_SELECTIVE_ACK) &&
10717             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10718             ((type == SCTP_NR_SELECTIVE_ACK) &&
10719             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10720                 /* we have a gap .. maybe */
10721                 for (i = 0; i < siz; i++) {
10722                         tsn_map = asoc->mapping_array[i];
10723                         if (type == SCTP_SELECTIVE_ACK) {
10724                                 tsn_map |= asoc->nr_mapping_array[i];
10725                         }
10726                         if (i == 0) {
10727                                 /*
10728                                  * Clear all bits corresponding to TSNs
10729                                  * smaller or equal to the cumulative TSN.
10730                                  */
10731                                 tsn_map &= (~0U << (1 - offset));
10732                         }
10733                         selector = &sack_array[tsn_map];
10734                         if (mergeable && selector->right_edge) {
10735                                 /*
10736                                  * Backup, left and right edges were ok to
10737                                  * merge.
10738                                  */
10739                                 num_gap_blocks--;
10740                                 gap_descriptor--;
10741                         }
10742                         if (selector->num_entries == 0)
10743                                 mergeable = 0;
10744                         else {
10745                                 for (j = 0; j < selector->num_entries; j++) {
10746                                         if (mergeable && selector->right_edge) {
10747                                                 /*
10748                                                  * do a merge by NOT setting
10749                                                  * the left side
10750                                                  */
10751                                                 mergeable = 0;
10752                                         } else {
10753                                                 /*
10754                                                  * no merge, set the left
10755                                                  * side
10756                                                  */
10757                                                 mergeable = 0;
10758                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10759                                         }
10760                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10761                                         num_gap_blocks++;
10762                                         gap_descriptor++;
10763                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10764                                                 /* no more room */
10765                                                 limit_reached = 1;
10766                                                 break;
10767                                         }
10768                                 }
10769                                 if (selector->left_edge) {
10770                                         mergeable = 1;
10771                                 }
10772                         }
10773                         if (limit_reached) {
10774                                 /* Reached the limit stop */
10775                                 break;
10776                         }
10777                         offset += 8;
10778                 }
10779         }
10780         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10781             (limit_reached == 0)) {
10782
10783                 mergeable = 0;
10784
10785                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10786                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10787                 } else {
10788                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10789                 }
10790
10791                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10792                         offset = 1;
10793                 } else {
10794                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10795                 }
10796                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10797                         /* we have a gap .. maybe */
10798                         for (i = 0; i < siz; i++) {
10799                                 tsn_map = asoc->nr_mapping_array[i];
10800                                 if (i == 0) {
10801                                         /*
10802                                          * Clear all bits corresponding to
10803                                          * TSNs smaller or equal to the
10804                                          * cumulative TSN.
10805                                          */
10806                                         tsn_map &= (~0U << (1 - offset));
10807                                 }
10808                                 selector = &sack_array[tsn_map];
10809                                 if (mergeable && selector->right_edge) {
10810                                         /*
10811                                          * Backup, left and right edges were
10812                                          * ok to merge.
10813                                          */
10814                                         num_nr_gap_blocks--;
10815                                         gap_descriptor--;
10816                                 }
10817                                 if (selector->num_entries == 0)
10818                                         mergeable = 0;
10819                                 else {
10820                                         for (j = 0; j < selector->num_entries; j++) {
10821                                                 if (mergeable && selector->right_edge) {
10822                                                         /*
10823                                                          * do a merge by NOT
10824                                                          * setting the left
10825                                                          * side
10826                                                          */
10827                                                         mergeable = 0;
10828                                                 } else {
10829                                                         /*
10830                                                          * no merge, set the
10831                                                          * left side
10832                                                          */
10833                                                         mergeable = 0;
10834                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10835                                                 }
10836                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10837                                                 num_nr_gap_blocks++;
10838                                                 gap_descriptor++;
10839                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10840                                                         /* no more room */
10841                                                         limit_reached = 1;
10842                                                         break;
10843                                                 }
10844                                         }
10845                                         if (selector->left_edge) {
10846                                                 mergeable = 1;
10847                                         }
10848                                 }
10849                                 if (limit_reached) {
10850                                         /* Reached the limit stop */
10851                                         break;
10852                                 }
10853                                 offset += 8;
10854                         }
10855                 }
10856         }
10857         /* now we must add any dups we are going to report. */
10858         if ((limit_reached == 0) && (asoc->numduptsns)) {
10859                 dup = (uint32_t *) gap_descriptor;
10860                 for (i = 0; i < asoc->numduptsns; i++) {
10861                         *dup = htonl(asoc->dup_tsns[i]);
10862                         dup++;
10863                         num_dups++;
10864                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10865                                 /* no more room */
10866                                 break;
10867                         }
10868                 }
10869                 asoc->numduptsns = 0;
10870         }
10871         /*
10872          * now that the chunk is prepared queue it to the control chunk
10873          * queue.
10874          */
10875         if (type == SCTP_SELECTIVE_ACK) {
10876                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_sack_chunk) +
10877                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10878                     num_dups * sizeof(int32_t));
10879                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10880                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10881                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10882                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10883                 sack->sack.num_dup_tsns = htons(num_dups);
10884                 sack->ch.chunk_type = type;
10885                 sack->ch.chunk_flags = flags;
10886                 sack->ch.chunk_length = htons(a_chk->send_size);
10887         } else {
10888                 a_chk->send_size = (uint16_t) (sizeof(struct sctp_nr_sack_chunk) +
10889                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10890                     num_dups * sizeof(int32_t));
10891                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10892                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10893                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10894                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10895                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10896                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10897                 nr_sack->nr_sack.reserved = 0;
10898                 nr_sack->ch.chunk_type = type;
10899                 nr_sack->ch.chunk_flags = flags;
10900                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10901         }
10902         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10903         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10904         asoc->ctrl_queue_cnt++;
10905         asoc->send_sack = 0;
10906         SCTP_STAT_INCR(sctps_sendsacks);
10907         return;
10908 }
10909
10910 void
10911 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10912 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10913     SCTP_UNUSED
10914 #endif
10915 )
10916 {
10917         struct mbuf *m_abort, *m, *m_last;
10918         struct mbuf *m_out, *m_end = NULL;
10919         struct sctp_abort_chunk *abort;
10920         struct sctp_auth_chunk *auth = NULL;
10921         struct sctp_nets *net;
10922         uint32_t vtag;
10923         uint32_t auth_offset = 0;
10924         uint16_t cause_len, chunk_len, padding_len;
10925
10926         SCTP_TCB_LOCK_ASSERT(stcb);
10927         /*-
10928          * Add an AUTH chunk, if chunk requires it and save the offset into
10929          * the chain for AUTH
10930          */
10931         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10932             stcb->asoc.peer_auth_chunks)) {
10933                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10934                     stcb, SCTP_ABORT_ASSOCIATION);
10935                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10936         } else {
10937                 m_out = NULL;
10938         }
10939         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10940         if (m_abort == NULL) {
10941                 if (m_out) {
10942                         sctp_m_freem(m_out);
10943                 }
10944                 if (operr) {
10945                         sctp_m_freem(operr);
10946                 }
10947                 return;
10948         }
10949         /* link in any error */
10950         SCTP_BUF_NEXT(m_abort) = operr;
10951         cause_len = 0;
10952         m_last = NULL;
10953         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10954                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10955                 if (SCTP_BUF_NEXT(m) == NULL) {
10956                         m_last = m;
10957                 }
10958         }
10959         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10960         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10961         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10962         if (m_out == NULL) {
10963                 /* NO Auth chunk prepended, so reserve space in front */
10964                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10965                 m_out = m_abort;
10966         } else {
10967                 /* Put AUTH chunk at the front of the chain */
10968                 SCTP_BUF_NEXT(m_end) = m_abort;
10969         }
10970         if (stcb->asoc.alternate) {
10971                 net = stcb->asoc.alternate;
10972         } else {
10973                 net = stcb->asoc.primary_destination;
10974         }
10975         /* Fill in the ABORT chunk header. */
10976         abort = mtod(m_abort, struct sctp_abort_chunk *);
10977         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10978         if (stcb->asoc.peer_vtag == 0) {
10979                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10980                 vtag = stcb->asoc.my_vtag;
10981                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10982         } else {
10983                 vtag = stcb->asoc.peer_vtag;
10984                 abort->ch.chunk_flags = 0;
10985         }
10986         abort->ch.chunk_length = htons(chunk_len);
10987         /* Add padding, if necessary. */
10988         if (padding_len > 0) {
10989                 if ((m_last == NULL) ||
10990                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10991                         sctp_m_freem(m_out);
10992                         return;
10993                 }
10994         }
10995         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10996             (struct sockaddr *)&net->ro._l_addr,
10997             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10998             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10999             stcb->asoc.primary_destination->port, NULL,
11000             0, 0,
11001             so_locked);
11002         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11003 }
11004
11005 void
11006 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11007     struct sctp_nets *net,
11008     int reflect_vtag)
11009 {
11010         /* formulate and SEND a SHUTDOWN-COMPLETE */
11011         struct mbuf *m_shutdown_comp;
11012         struct sctp_shutdown_complete_chunk *shutdown_complete;
11013         uint32_t vtag;
11014         uint8_t flags;
11015
11016         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11017         if (m_shutdown_comp == NULL) {
11018                 /* no mbuf's */
11019                 return;
11020         }
11021         if (reflect_vtag) {
11022                 flags = SCTP_HAD_NO_TCB;
11023                 vtag = stcb->asoc.my_vtag;
11024         } else {
11025                 flags = 0;
11026                 vtag = stcb->asoc.peer_vtag;
11027         }
11028         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11029         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11030         shutdown_complete->ch.chunk_flags = flags;
11031         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11032         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11033         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11034             (struct sockaddr *)&net->ro._l_addr,
11035             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11036             stcb->sctp_ep->sctp_lport, stcb->rport,
11037             htonl(vtag),
11038             net->port, NULL,
11039             0, 0,
11040             SCTP_SO_NOT_LOCKED);
11041         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11042         return;
11043 }
11044
11045 static void
11046 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11047     struct sctphdr *sh, uint32_t vtag,
11048     uint8_t type, struct mbuf *cause,
11049     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11050     uint32_t vrf_id, uint16_t port)
11051 {
11052         struct mbuf *o_pak;
11053         struct mbuf *mout;
11054         struct sctphdr *shout;
11055         struct sctp_chunkhdr *ch;
11056
11057 #if defined(INET) || defined(INET6)
11058         struct udphdr *udp;
11059         int ret;
11060
11061 #endif
11062         int len, cause_len, padding_len;
11063
11064 #ifdef INET
11065         struct sockaddr_in *src_sin, *dst_sin;
11066         struct ip *ip;
11067
11068 #endif
11069 #ifdef INET6
11070         struct sockaddr_in6 *src_sin6, *dst_sin6;
11071         struct ip6_hdr *ip6;
11072
11073 #endif
11074
11075         /* Compute the length of the cause and add final padding. */
11076         cause_len = 0;
11077         if (cause != NULL) {
11078                 struct mbuf *m_at, *m_last = NULL;
11079
11080                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11081                         if (SCTP_BUF_NEXT(m_at) == NULL)
11082                                 m_last = m_at;
11083                         cause_len += SCTP_BUF_LEN(m_at);
11084                 }
11085                 padding_len = cause_len % 4;
11086                 if (padding_len != 0) {
11087                         padding_len = 4 - padding_len;
11088                 }
11089                 if (padding_len != 0) {
11090                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11091                                 sctp_m_freem(cause);
11092                                 return;
11093                         }
11094                 }
11095         } else {
11096                 padding_len = 0;
11097         }
11098         /* Get an mbuf for the header. */
11099         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11100         switch (dst->sa_family) {
11101 #ifdef INET
11102         case AF_INET:
11103                 len += sizeof(struct ip);
11104                 break;
11105 #endif
11106 #ifdef INET6
11107         case AF_INET6:
11108                 len += sizeof(struct ip6_hdr);
11109                 break;
11110 #endif
11111         default:
11112                 break;
11113         }
11114 #if defined(INET) || defined(INET6)
11115         if (port) {
11116                 len += sizeof(struct udphdr);
11117         }
11118 #endif
11119         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11120         if (mout == NULL) {
11121                 if (cause) {
11122                         sctp_m_freem(cause);
11123                 }
11124                 return;
11125         }
11126         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11127         SCTP_BUF_LEN(mout) = len;
11128         SCTP_BUF_NEXT(mout) = cause;
11129         M_SETFIB(mout, fibnum);
11130         mout->m_pkthdr.flowid = mflowid;
11131         M_HASHTYPE_SET(mout, mflowtype);
11132 #ifdef INET
11133         ip = NULL;
11134 #endif
11135 #ifdef INET6
11136         ip6 = NULL;
11137 #endif
11138         switch (dst->sa_family) {
11139 #ifdef INET
11140         case AF_INET:
11141                 src_sin = (struct sockaddr_in *)src;
11142                 dst_sin = (struct sockaddr_in *)dst;
11143                 ip = mtod(mout, struct ip *);
11144                 ip->ip_v = IPVERSION;
11145                 ip->ip_hl = (sizeof(struct ip) >> 2);
11146                 ip->ip_tos = 0;
11147                 ip->ip_off = 0;
11148                 ip_fillid(ip);
11149                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11150                 if (port) {
11151                         ip->ip_p = IPPROTO_UDP;
11152                 } else {
11153                         ip->ip_p = IPPROTO_SCTP;
11154                 }
11155                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11156                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11157                 ip->ip_sum = 0;
11158                 len = sizeof(struct ip);
11159                 shout = (struct sctphdr *)((caddr_t)ip + len);
11160                 break;
11161 #endif
11162 #ifdef INET6
11163         case AF_INET6:
11164                 src_sin6 = (struct sockaddr_in6 *)src;
11165                 dst_sin6 = (struct sockaddr_in6 *)dst;
11166                 ip6 = mtod(mout, struct ip6_hdr *);
11167                 ip6->ip6_flow = htonl(0x60000000);
11168                 if (V_ip6_auto_flowlabel) {
11169                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11170                 }
11171                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11172                 if (port) {
11173                         ip6->ip6_nxt = IPPROTO_UDP;
11174                 } else {
11175                         ip6->ip6_nxt = IPPROTO_SCTP;
11176                 }
11177                 ip6->ip6_src = dst_sin6->sin6_addr;
11178                 ip6->ip6_dst = src_sin6->sin6_addr;
11179                 len = sizeof(struct ip6_hdr);
11180                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11181                 break;
11182 #endif
11183         default:
11184                 len = 0;
11185                 shout = mtod(mout, struct sctphdr *);
11186                 break;
11187         }
11188 #if defined(INET) || defined(INET6)
11189         if (port) {
11190                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11191                         sctp_m_freem(mout);
11192                         return;
11193                 }
11194                 udp = (struct udphdr *)shout;
11195                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11196                 udp->uh_dport = port;
11197                 udp->uh_sum = 0;
11198                 udp->uh_ulen = htons((uint16_t) (sizeof(struct udphdr) +
11199                     sizeof(struct sctphdr) +
11200                     sizeof(struct sctp_chunkhdr) +
11201                     cause_len + padding_len));
11202                 len += sizeof(struct udphdr);
11203                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11204         } else {
11205                 udp = NULL;
11206         }
11207 #endif
11208         shout->src_port = sh->dest_port;
11209         shout->dest_port = sh->src_port;
11210         shout->checksum = 0;
11211         if (vtag) {
11212                 shout->v_tag = htonl(vtag);
11213         } else {
11214                 shout->v_tag = sh->v_tag;
11215         }
11216         len += sizeof(struct sctphdr);
11217         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11218         ch->chunk_type = type;
11219         if (vtag) {
11220                 ch->chunk_flags = 0;
11221         } else {
11222                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11223         }
11224         ch->chunk_length = htons((uint16_t) (sizeof(struct sctp_chunkhdr) + cause_len));
11225         len += sizeof(struct sctp_chunkhdr);
11226         len += cause_len + padding_len;
11227
11228         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11229                 sctp_m_freem(mout);
11230                 return;
11231         }
11232         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11233         switch (dst->sa_family) {
11234 #ifdef INET
11235         case AF_INET:
11236                 if (port) {
11237                         if (V_udp_cksum) {
11238                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11239                         } else {
11240                                 udp->uh_sum = 0;
11241                         }
11242                 }
11243                 ip->ip_len = htons(len);
11244                 if (port) {
11245 #if defined(SCTP_WITH_NO_CSUM)
11246                         SCTP_STAT_INCR(sctps_sendnocrc);
11247 #else
11248                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11249                         SCTP_STAT_INCR(sctps_sendswcrc);
11250 #endif
11251                         if (V_udp_cksum) {
11252                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11253                         }
11254                 } else {
11255 #if defined(SCTP_WITH_NO_CSUM)
11256                         SCTP_STAT_INCR(sctps_sendnocrc);
11257 #else
11258                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11259                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11260                         SCTP_STAT_INCR(sctps_sendhwcrc);
11261 #endif
11262                 }
11263 #ifdef SCTP_PACKET_LOGGING
11264                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11265                         sctp_packet_log(o_pak);
11266                 }
11267 #endif
11268                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11269                 break;
11270 #endif
11271 #ifdef INET6
11272         case AF_INET6:
11273                 ip6->ip6_plen = (uint16_t) (len - sizeof(struct ip6_hdr));
11274                 if (port) {
11275 #if defined(SCTP_WITH_NO_CSUM)
11276                         SCTP_STAT_INCR(sctps_sendnocrc);
11277 #else
11278                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11279                         SCTP_STAT_INCR(sctps_sendswcrc);
11280 #endif
11281                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11282                                 udp->uh_sum = 0xffff;
11283                         }
11284                 } else {
11285 #if defined(SCTP_WITH_NO_CSUM)
11286                         SCTP_STAT_INCR(sctps_sendnocrc);
11287 #else
11288                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11289                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11290                         SCTP_STAT_INCR(sctps_sendhwcrc);
11291 #endif
11292                 }
11293 #ifdef SCTP_PACKET_LOGGING
11294                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11295                         sctp_packet_log(o_pak);
11296                 }
11297 #endif
11298                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11299                 break;
11300 #endif
11301         default:
11302                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11303                     dst->sa_family);
11304                 sctp_m_freem(mout);
11305                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11306                 return;
11307         }
11308         SCTP_STAT_INCR(sctps_sendpackets);
11309         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11310         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11311         return;
11312 }
11313
11314 void
11315 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11316     struct sctphdr *sh,
11317     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11318     uint32_t vrf_id, uint16_t port)
11319 {
11320         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11321             mflowtype, mflowid, fibnum,
11322             vrf_id, port);
11323 }
11324
11325 void
11326 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11327 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11328     SCTP_UNUSED
11329 #endif
11330 )
11331 {
11332         struct sctp_tmit_chunk *chk;
11333         struct sctp_heartbeat_chunk *hb;
11334         struct timeval now;
11335
11336         SCTP_TCB_LOCK_ASSERT(stcb);
11337         if (net == NULL) {
11338                 return;
11339         }
11340         (void)SCTP_GETTIME_TIMEVAL(&now);
11341         switch (net->ro._l_addr.sa.sa_family) {
11342 #ifdef INET
11343         case AF_INET:
11344                 break;
11345 #endif
11346 #ifdef INET6
11347         case AF_INET6:
11348                 break;
11349 #endif
11350         default:
11351                 return;
11352         }
11353         sctp_alloc_a_chunk(stcb, chk);
11354         if (chk == NULL) {
11355                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11356                 return;
11357         }
11358         chk->copy_by_ref = 0;
11359         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11360         chk->rec.chunk_id.can_take_data = 1;
11361         chk->flags = 0;
11362         chk->asoc = &stcb->asoc;
11363         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11364
11365         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11366         if (chk->data == NULL) {
11367                 sctp_free_a_chunk(stcb, chk, so_locked);
11368                 return;
11369         }
11370         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11371         SCTP_BUF_LEN(chk->data) = chk->send_size;
11372         chk->sent = SCTP_DATAGRAM_UNSENT;
11373         chk->snd_count = 0;
11374         chk->whoTo = net;
11375         atomic_add_int(&chk->whoTo->ref_count, 1);
11376         /* Now we have a mbuf that we can fill in with the details */
11377         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11378         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11379         /* fill out chunk header */
11380         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11381         hb->ch.chunk_flags = 0;
11382         hb->ch.chunk_length = htons(chk->send_size);
11383         /* Fill out hb parameter */
11384         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11385         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11386         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11387         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11388         /* Did our user request this one, put it in */
11389         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11390         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11391         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11392                 /*
11393                  * we only take from the entropy pool if the address is not
11394                  * confirmed.
11395                  */
11396                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11397                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11398         } else {
11399                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11400                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11401         }
11402         switch (net->ro._l_addr.sa.sa_family) {
11403 #ifdef INET
11404         case AF_INET:
11405                 memcpy(hb->heartbeat.hb_info.address,
11406                     &net->ro._l_addr.sin.sin_addr,
11407                     sizeof(net->ro._l_addr.sin.sin_addr));
11408                 break;
11409 #endif
11410 #ifdef INET6
11411         case AF_INET6:
11412                 memcpy(hb->heartbeat.hb_info.address,
11413                     &net->ro._l_addr.sin6.sin6_addr,
11414                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11415                 break;
11416 #endif
11417         default:
11418                 if (chk->data) {
11419                         sctp_m_freem(chk->data);
11420                         chk->data = NULL;
11421                 }
11422                 sctp_free_a_chunk(stcb, chk, so_locked);
11423                 return;
11424                 break;
11425         }
11426         net->hb_responded = 0;
11427         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11428         stcb->asoc.ctrl_queue_cnt++;
11429         SCTP_STAT_INCR(sctps_sendheartbeat);
11430         return;
11431 }
11432
11433 void
11434 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11435     uint32_t high_tsn)
11436 {
11437         struct sctp_association *asoc;
11438         struct sctp_ecne_chunk *ecne;
11439         struct sctp_tmit_chunk *chk;
11440
11441         if (net == NULL) {
11442                 return;
11443         }
11444         asoc = &stcb->asoc;
11445         SCTP_TCB_LOCK_ASSERT(stcb);
11446         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11447                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11448                         /* found a previous ECN_ECHO update it if needed */
11449                         uint32_t cnt, ctsn;
11450
11451                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11452                         ctsn = ntohl(ecne->tsn);
11453                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11454                                 ecne->tsn = htonl(high_tsn);
11455                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11456                         }
11457                         cnt = ntohl(ecne->num_pkts_since_cwr);
11458                         cnt++;
11459                         ecne->num_pkts_since_cwr = htonl(cnt);
11460                         return;
11461                 }
11462         }
11463         /* nope could not find one to update so we must build one */
11464         sctp_alloc_a_chunk(stcb, chk);
11465         if (chk == NULL) {
11466                 return;
11467         }
11468         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11469         chk->copy_by_ref = 0;
11470         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11471         chk->rec.chunk_id.can_take_data = 0;
11472         chk->flags = 0;
11473         chk->asoc = &stcb->asoc;
11474         chk->send_size = sizeof(struct sctp_ecne_chunk);
11475         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11476         if (chk->data == NULL) {
11477                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11478                 return;
11479         }
11480         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11481         SCTP_BUF_LEN(chk->data) = chk->send_size;
11482         chk->sent = SCTP_DATAGRAM_UNSENT;
11483         chk->snd_count = 0;
11484         chk->whoTo = net;
11485         atomic_add_int(&chk->whoTo->ref_count, 1);
11486
11487         stcb->asoc.ecn_echo_cnt_onq++;
11488         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11489         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11490         ecne->ch.chunk_flags = 0;
11491         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11492         ecne->tsn = htonl(high_tsn);
11493         ecne->num_pkts_since_cwr = htonl(1);
11494         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11495         asoc->ctrl_queue_cnt++;
11496 }
11497
11498 void
11499 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11500     struct mbuf *m, int len, int iphlen, int bad_crc)
11501 {
11502         struct sctp_association *asoc;
11503         struct sctp_pktdrop_chunk *drp;
11504         struct sctp_tmit_chunk *chk;
11505         uint8_t *datap;
11506         int was_trunc = 0;
11507         int fullsz = 0;
11508         long spc;
11509         int offset;
11510         struct sctp_chunkhdr *ch, chunk_buf;
11511         unsigned int chk_length;
11512
11513         if (!stcb) {
11514                 return;
11515         }
11516         asoc = &stcb->asoc;
11517         SCTP_TCB_LOCK_ASSERT(stcb);
11518         if (asoc->pktdrop_supported == 0) {
11519                 /*-
11520                  * peer must declare support before I send one.
11521                  */
11522                 return;
11523         }
11524         if (stcb->sctp_socket == NULL) {
11525                 return;
11526         }
11527         sctp_alloc_a_chunk(stcb, chk);
11528         if (chk == NULL) {
11529                 return;
11530         }
11531         chk->copy_by_ref = 0;
11532         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11533         chk->rec.chunk_id.can_take_data = 1;
11534         chk->flags = 0;
11535         len -= iphlen;
11536         chk->send_size = len;
11537         /* Validate that we do not have an ABORT in here. */
11538         offset = iphlen + sizeof(struct sctphdr);
11539         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11540             sizeof(*ch), (uint8_t *) & chunk_buf);
11541         while (ch != NULL) {
11542                 chk_length = ntohs(ch->chunk_length);
11543                 if (chk_length < sizeof(*ch)) {
11544                         /* break to abort land */
11545                         break;
11546                 }
11547                 switch (ch->chunk_type) {
11548                 case SCTP_PACKET_DROPPED:
11549                 case SCTP_ABORT_ASSOCIATION:
11550                 case SCTP_INITIATION_ACK:
11551                         /**
11552                          * We don't respond with an PKT-DROP to an ABORT
11553                          * or PKT-DROP. We also do not respond to an
11554                          * INIT-ACK, because we can't know if the initiation
11555                          * tag is correct or not.
11556                          */
11557                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11558                         return;
11559                 default:
11560                         break;
11561                 }
11562                 offset += SCTP_SIZE32(chk_length);
11563                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11564                     sizeof(*ch), (uint8_t *) & chunk_buf);
11565         }
11566
11567         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11568             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11569                 /*
11570                  * only send 1 mtu worth, trim off the excess on the end.
11571                  */
11572                 fullsz = len;
11573                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11574                 was_trunc = 1;
11575         }
11576         chk->asoc = &stcb->asoc;
11577         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11578         if (chk->data == NULL) {
11579 jump_out:
11580                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11581                 return;
11582         }
11583         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11584         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11585         if (drp == NULL) {
11586                 sctp_m_freem(chk->data);
11587                 chk->data = NULL;
11588                 goto jump_out;
11589         }
11590         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11591             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11592         chk->book_size_scale = 0;
11593         if (was_trunc) {
11594                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11595                 drp->trunc_len = htons(fullsz);
11596                 /*
11597                  * Len is already adjusted to size minus overhead above take
11598                  * out the pkt_drop chunk itself from it.
11599                  */
11600                 chk->send_size = (uint16_t) (len - sizeof(struct sctp_pktdrop_chunk));
11601                 len = chk->send_size;
11602         } else {
11603                 /* no truncation needed */
11604                 drp->ch.chunk_flags = 0;
11605                 drp->trunc_len = htons(0);
11606         }
11607         if (bad_crc) {
11608                 drp->ch.chunk_flags |= SCTP_BADCRC;
11609         }
11610         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11611         SCTP_BUF_LEN(chk->data) = chk->send_size;
11612         chk->sent = SCTP_DATAGRAM_UNSENT;
11613         chk->snd_count = 0;
11614         if (net) {
11615                 /* we should hit here */
11616                 chk->whoTo = net;
11617                 atomic_add_int(&chk->whoTo->ref_count, 1);
11618         } else {
11619                 chk->whoTo = NULL;
11620         }
11621         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11622         drp->ch.chunk_length = htons(chk->send_size);
11623         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11624         if (spc < 0) {
11625                 spc = 0;
11626         }
11627         drp->bottle_bw = htonl(spc);
11628         if (asoc->my_rwnd) {
11629                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11630                     asoc->size_on_all_streams +
11631                     asoc->my_rwnd_control_len +
11632                     stcb->sctp_socket->so_rcv.sb_cc);
11633         } else {
11634                 /*-
11635                  * If my rwnd is 0, possibly from mbuf depletion as well as
11636                  * space used, tell the peer there is NO space aka onq == bw
11637                  */
11638                 drp->current_onq = htonl(spc);
11639         }
11640         drp->reserved = 0;
11641         datap = drp->data;
11642         m_copydata(m, iphlen, len, (caddr_t)datap);
11643         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11644         asoc->ctrl_queue_cnt++;
11645 }
11646
11647 void
11648 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11649 {
11650         struct sctp_association *asoc;
11651         struct sctp_cwr_chunk *cwr;
11652         struct sctp_tmit_chunk *chk;
11653
11654         SCTP_TCB_LOCK_ASSERT(stcb);
11655         if (net == NULL) {
11656                 return;
11657         }
11658         asoc = &stcb->asoc;
11659         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11660                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11661                         /*
11662                          * found a previous CWR queued to same destination
11663                          * update it if needed
11664                          */
11665                         uint32_t ctsn;
11666
11667                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11668                         ctsn = ntohl(cwr->tsn);
11669                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11670                                 cwr->tsn = htonl(high_tsn);
11671                         }
11672                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11673                                 /* Make sure override is carried */
11674                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11675                         }
11676                         return;
11677                 }
11678         }
11679         sctp_alloc_a_chunk(stcb, chk);
11680         if (chk == NULL) {
11681                 return;
11682         }
11683         chk->copy_by_ref = 0;
11684         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11685         chk->rec.chunk_id.can_take_data = 1;
11686         chk->flags = 0;
11687         chk->asoc = &stcb->asoc;
11688         chk->send_size = sizeof(struct sctp_cwr_chunk);
11689         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11690         if (chk->data == NULL) {
11691                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11692                 return;
11693         }
11694         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11695         SCTP_BUF_LEN(chk->data) = chk->send_size;
11696         chk->sent = SCTP_DATAGRAM_UNSENT;
11697         chk->snd_count = 0;
11698         chk->whoTo = net;
11699         atomic_add_int(&chk->whoTo->ref_count, 1);
11700         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11701         cwr->ch.chunk_type = SCTP_ECN_CWR;
11702         cwr->ch.chunk_flags = override;
11703         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11704         cwr->tsn = htonl(high_tsn);
11705         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11706         asoc->ctrl_queue_cnt++;
11707 }
11708
11709 static int
11710 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11711     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11712 {
11713         uint16_t len, old_len, i;
11714         struct sctp_stream_reset_out_request *req_out;
11715         struct sctp_chunkhdr *ch;
11716         int at;
11717         int number_entries = 0;
11718
11719         ch = mtod(chk->data, struct sctp_chunkhdr *);
11720         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11721         /* get to new offset for the param. */
11722         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11723         /* now how long will this param be? */
11724         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11725                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11726                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11727                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11728                         number_entries++;
11729                 }
11730         }
11731         if (number_entries == 0) {
11732                 return (0);
11733         }
11734         if (number_entries == stcb->asoc.streamoutcnt) {
11735                 number_entries = 0;
11736         }
11737         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11738                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11739         }
11740         len = (uint16_t) (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11741         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11742         req_out->ph.param_length = htons(len);
11743         req_out->request_seq = htonl(seq);
11744         req_out->response_seq = htonl(resp_seq);
11745         req_out->send_reset_at_tsn = htonl(last_sent);
11746         at = 0;
11747         if (number_entries) {
11748                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11749                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11750                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11751                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11752                                 req_out->list_of_streams[at] = htons(i);
11753                                 at++;
11754                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11755                                 if (at >= number_entries) {
11756                                         break;
11757                                 }
11758                         }
11759                 }
11760         } else {
11761                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11762                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11763                 }
11764         }
11765         if (SCTP_SIZE32(len) > len) {
11766                 /*-
11767                  * Need to worry about the pad we may end up adding to the
11768                  * end. This is easy since the struct is either aligned to 4
11769                  * bytes or 2 bytes off.
11770                  */
11771                 req_out->list_of_streams[number_entries] = 0;
11772         }
11773         /* now fix the chunk length */
11774         ch->chunk_length = htons(len + old_len);
11775         chk->book_size = len + old_len;
11776         chk->book_size_scale = 0;
11777         chk->send_size = SCTP_SIZE32(chk->book_size);
11778         SCTP_BUF_LEN(chk->data) = chk->send_size;
11779         return (1);
11780 }
11781
11782 static void
11783 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11784     int number_entries, uint16_t * list,
11785     uint32_t seq)
11786 {
11787         uint16_t len, old_len, i;
11788         struct sctp_stream_reset_in_request *req_in;
11789         struct sctp_chunkhdr *ch;
11790
11791         ch = mtod(chk->data, struct sctp_chunkhdr *);
11792         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11793
11794         /* get to new offset for the param. */
11795         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11796         /* now how long will this param be? */
11797         len = (uint16_t) (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11798         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11799         req_in->ph.param_length = htons(len);
11800         req_in->request_seq = htonl(seq);
11801         if (number_entries) {
11802                 for (i = 0; i < number_entries; i++) {
11803                         req_in->list_of_streams[i] = htons(list[i]);
11804                 }
11805         }
11806         if (SCTP_SIZE32(len) > len) {
11807                 /*-
11808                  * Need to worry about the pad we may end up adding to the
11809                  * end. This is easy since the struct is either aligned to 4
11810                  * bytes or 2 bytes off.
11811                  */
11812                 req_in->list_of_streams[number_entries] = 0;
11813         }
11814         /* now fix the chunk length */
11815         ch->chunk_length = htons(len + old_len);
11816         chk->book_size = len + old_len;
11817         chk->book_size_scale = 0;
11818         chk->send_size = SCTP_SIZE32(chk->book_size);
11819         SCTP_BUF_LEN(chk->data) = chk->send_size;
11820         return;
11821 }
11822
11823 static void
11824 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11825     uint32_t seq)
11826 {
11827         uint16_t len, old_len;
11828         struct sctp_stream_reset_tsn_request *req_tsn;
11829         struct sctp_chunkhdr *ch;
11830
11831         ch = mtod(chk->data, struct sctp_chunkhdr *);
11832         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11833
11834         /* get to new offset for the param. */
11835         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11836         /* now how long will this param be? */
11837         len = sizeof(struct sctp_stream_reset_tsn_request);
11838         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11839         req_tsn->ph.param_length = htons(len);
11840         req_tsn->request_seq = htonl(seq);
11841
11842         /* now fix the chunk length */
11843         ch->chunk_length = htons(len + old_len);
11844         chk->send_size = len + old_len;
11845         chk->book_size = SCTP_SIZE32(chk->send_size);
11846         chk->book_size_scale = 0;
11847         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11848         return;
11849 }
11850
11851 void
11852 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11853     uint32_t resp_seq, uint32_t result)
11854 {
11855         uint16_t len, old_len;
11856         struct sctp_stream_reset_response *resp;
11857         struct sctp_chunkhdr *ch;
11858
11859         ch = mtod(chk->data, struct sctp_chunkhdr *);
11860         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11861
11862         /* get to new offset for the param. */
11863         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11864         /* now how long will this param be? */
11865         len = sizeof(struct sctp_stream_reset_response);
11866         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11867         resp->ph.param_length = htons(len);
11868         resp->response_seq = htonl(resp_seq);
11869         resp->result = ntohl(result);
11870
11871         /* now fix the chunk length */
11872         ch->chunk_length = htons(len + old_len);
11873         chk->book_size = len + old_len;
11874         chk->book_size_scale = 0;
11875         chk->send_size = SCTP_SIZE32(chk->book_size);
11876         SCTP_BUF_LEN(chk->data) = chk->send_size;
11877         return;
11878 }
11879
11880 void
11881 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11882     struct sctp_stream_reset_list *ent,
11883     int response)
11884 {
11885         struct sctp_association *asoc;
11886         struct sctp_tmit_chunk *chk;
11887         struct sctp_chunkhdr *ch;
11888
11889         asoc = &stcb->asoc;
11890
11891         /*
11892          * Reset our last reset action to the new one IP -> response
11893          * (PERFORMED probably). This assures that if we fail to send, a
11894          * retran from the peer will get the new response.
11895          */
11896         asoc->last_reset_action[0] = response;
11897         if (asoc->stream_reset_outstanding) {
11898                 return;
11899         }
11900         sctp_alloc_a_chunk(stcb, chk);
11901         if (chk == NULL) {
11902                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11903                 return;
11904         }
11905         chk->copy_by_ref = 0;
11906         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11907         chk->rec.chunk_id.can_take_data = 0;
11908         chk->flags = 0;
11909         chk->asoc = &stcb->asoc;
11910         chk->book_size = sizeof(struct sctp_chunkhdr);
11911         chk->send_size = SCTP_SIZE32(chk->book_size);
11912         chk->book_size_scale = 0;
11913         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11914         if (chk->data == NULL) {
11915                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11916                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11917                 return;
11918         }
11919         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11920         sctp_add_stream_reset_result(chk, ent->seq, response);
11921         /* setup chunk parameters */
11922         chk->sent = SCTP_DATAGRAM_UNSENT;
11923         chk->snd_count = 0;
11924         if (stcb->asoc.alternate) {
11925                 chk->whoTo = stcb->asoc.alternate;
11926         } else {
11927                 chk->whoTo = stcb->asoc.primary_destination;
11928         }
11929         ch = mtod(chk->data, struct sctp_chunkhdr *);
11930         ch->chunk_type = SCTP_STREAM_RESET;
11931         ch->chunk_flags = 0;
11932         ch->chunk_length = htons(chk->book_size);
11933         atomic_add_int(&chk->whoTo->ref_count, 1);
11934         SCTP_BUF_LEN(chk->data) = chk->send_size;
11935         /* insert the chunk for sending */
11936         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11937             chk,
11938             sctp_next);
11939         asoc->ctrl_queue_cnt++;
11940 }
11941
11942 void
11943 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11944     uint32_t resp_seq, uint32_t result,
11945     uint32_t send_una, uint32_t recv_next)
11946 {
11947         uint16_t len, old_len;
11948         struct sctp_stream_reset_response_tsn *resp;
11949         struct sctp_chunkhdr *ch;
11950
11951         ch = mtod(chk->data, struct sctp_chunkhdr *);
11952         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11953
11954         /* get to new offset for the param. */
11955         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11956         /* now how long will this param be? */
11957         len = sizeof(struct sctp_stream_reset_response_tsn);
11958         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11959         resp->ph.param_length = htons(len);
11960         resp->response_seq = htonl(resp_seq);
11961         resp->result = htonl(result);
11962         resp->senders_next_tsn = htonl(send_una);
11963         resp->receivers_next_tsn = htonl(recv_next);
11964
11965         /* now fix the chunk length */
11966         ch->chunk_length = htons(len + old_len);
11967         chk->book_size = len + old_len;
11968         chk->send_size = SCTP_SIZE32(chk->book_size);
11969         chk->book_size_scale = 0;
11970         SCTP_BUF_LEN(chk->data) = chk->send_size;
11971         return;
11972 }
11973
11974 static void
11975 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11976     uint32_t seq,
11977     uint16_t adding)
11978 {
11979         uint16_t len, old_len;
11980         struct sctp_chunkhdr *ch;
11981         struct sctp_stream_reset_add_strm *addstr;
11982
11983         ch = mtod(chk->data, struct sctp_chunkhdr *);
11984         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11985
11986         /* get to new offset for the param. */
11987         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11988         /* now how long will this param be? */
11989         len = sizeof(struct sctp_stream_reset_add_strm);
11990
11991         /* Fill it out. */
11992         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11993         addstr->ph.param_length = htons(len);
11994         addstr->request_seq = htonl(seq);
11995         addstr->number_of_streams = htons(adding);
11996         addstr->reserved = 0;
11997
11998         /* now fix the chunk length */
11999         ch->chunk_length = htons(len + old_len);
12000         chk->send_size = len + old_len;
12001         chk->book_size = SCTP_SIZE32(chk->send_size);
12002         chk->book_size_scale = 0;
12003         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12004         return;
12005 }
12006
12007 static void
12008 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12009     uint32_t seq,
12010     uint16_t adding)
12011 {
12012         uint16_t len, old_len;
12013         struct sctp_chunkhdr *ch;
12014         struct sctp_stream_reset_add_strm *addstr;
12015
12016         ch = mtod(chk->data, struct sctp_chunkhdr *);
12017         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12018
12019         /* get to new offset for the param. */
12020         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12021         /* now how long will this param be? */
12022         len = sizeof(struct sctp_stream_reset_add_strm);
12023         /* Fill it out. */
12024         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12025         addstr->ph.param_length = htons(len);
12026         addstr->request_seq = htonl(seq);
12027         addstr->number_of_streams = htons(adding);
12028         addstr->reserved = 0;
12029
12030         /* now fix the chunk length */
12031         ch->chunk_length = htons(len + old_len);
12032         chk->send_size = len + old_len;
12033         chk->book_size = SCTP_SIZE32(chk->send_size);
12034         chk->book_size_scale = 0;
12035         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12036         return;
12037 }
12038
12039 int
12040 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12041 {
12042         struct sctp_association *asoc;
12043         struct sctp_tmit_chunk *chk;
12044         struct sctp_chunkhdr *ch;
12045         uint32_t seq;
12046
12047         asoc = &stcb->asoc;
12048         asoc->trigger_reset = 0;
12049         if (asoc->stream_reset_outstanding) {
12050                 return (EALREADY);
12051         }
12052         sctp_alloc_a_chunk(stcb, chk);
12053         if (chk == NULL) {
12054                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12055                 return (ENOMEM);
12056         }
12057         chk->copy_by_ref = 0;
12058         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12059         chk->rec.chunk_id.can_take_data = 0;
12060         chk->flags = 0;
12061         chk->asoc = &stcb->asoc;
12062         chk->book_size = sizeof(struct sctp_chunkhdr);
12063         chk->send_size = SCTP_SIZE32(chk->book_size);
12064         chk->book_size_scale = 0;
12065         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12066         if (chk->data == NULL) {
12067                 sctp_free_a_chunk(stcb, chk, so_locked);
12068                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12069                 return (ENOMEM);
12070         }
12071         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12072
12073         /* setup chunk parameters */
12074         chk->sent = SCTP_DATAGRAM_UNSENT;
12075         chk->snd_count = 0;
12076         if (stcb->asoc.alternate) {
12077                 chk->whoTo = stcb->asoc.alternate;
12078         } else {
12079                 chk->whoTo = stcb->asoc.primary_destination;
12080         }
12081         ch = mtod(chk->data, struct sctp_chunkhdr *);
12082         ch->chunk_type = SCTP_STREAM_RESET;
12083         ch->chunk_flags = 0;
12084         ch->chunk_length = htons(chk->book_size);
12085         atomic_add_int(&chk->whoTo->ref_count, 1);
12086         SCTP_BUF_LEN(chk->data) = chk->send_size;
12087         seq = stcb->asoc.str_reset_seq_out;
12088         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12089                 seq++;
12090                 asoc->stream_reset_outstanding++;
12091         } else {
12092                 m_freem(chk->data);
12093                 chk->data = NULL;
12094                 sctp_free_a_chunk(stcb, chk, so_locked);
12095                 return (ENOENT);
12096         }
12097         asoc->str_reset = chk;
12098         /* insert the chunk for sending */
12099         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12100             chk,
12101             sctp_next);
12102         asoc->ctrl_queue_cnt++;
12103
12104         if (stcb->asoc.send_sack) {
12105                 sctp_send_sack(stcb, so_locked);
12106         }
12107         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12108         return (0);
12109 }
12110
12111 int
12112 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12113     uint16_t number_entries, uint16_t * list,
12114     uint8_t send_in_req,
12115     uint8_t send_tsn_req,
12116     uint8_t add_stream,
12117     uint16_t adding_o,
12118     uint16_t adding_i, uint8_t peer_asked)
12119 {
12120         struct sctp_association *asoc;
12121         struct sctp_tmit_chunk *chk;
12122         struct sctp_chunkhdr *ch;
12123         int can_send_out_req = 0;
12124         uint32_t seq;
12125
12126         asoc = &stcb->asoc;
12127         if (asoc->stream_reset_outstanding) {
12128                 /*-
12129                  * Already one pending, must get ACK back to clear the flag.
12130                  */
12131                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12132                 return (EBUSY);
12133         }
12134         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12135             (add_stream == 0)) {
12136                 /* nothing to do */
12137                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12138                 return (EINVAL);
12139         }
12140         if (send_tsn_req && send_in_req) {
12141                 /* error, can't do that */
12142                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12143                 return (EINVAL);
12144         } else if (send_in_req) {
12145                 can_send_out_req = 1;
12146         }
12147         if (number_entries > (MCLBYTES -
12148             SCTP_MIN_OVERHEAD -
12149             sizeof(struct sctp_chunkhdr) -
12150             sizeof(struct sctp_stream_reset_out_request)) /
12151             sizeof(uint16_t)) {
12152                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12153                 return (ENOMEM);
12154         }
12155         sctp_alloc_a_chunk(stcb, chk);
12156         if (chk == NULL) {
12157                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12158                 return (ENOMEM);
12159         }
12160         chk->copy_by_ref = 0;
12161         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12162         chk->rec.chunk_id.can_take_data = 0;
12163         chk->flags = 0;
12164         chk->asoc = &stcb->asoc;
12165         chk->book_size = sizeof(struct sctp_chunkhdr);
12166         chk->send_size = SCTP_SIZE32(chk->book_size);
12167         chk->book_size_scale = 0;
12168
12169         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12170         if (chk->data == NULL) {
12171                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12172                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12173                 return (ENOMEM);
12174         }
12175         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12176
12177         /* setup chunk parameters */
12178         chk->sent = SCTP_DATAGRAM_UNSENT;
12179         chk->snd_count = 0;
12180         if (stcb->asoc.alternate) {
12181                 chk->whoTo = stcb->asoc.alternate;
12182         } else {
12183                 chk->whoTo = stcb->asoc.primary_destination;
12184         }
12185         atomic_add_int(&chk->whoTo->ref_count, 1);
12186         ch = mtod(chk->data, struct sctp_chunkhdr *);
12187         ch->chunk_type = SCTP_STREAM_RESET;
12188         ch->chunk_flags = 0;
12189         ch->chunk_length = htons(chk->book_size);
12190         SCTP_BUF_LEN(chk->data) = chk->send_size;
12191
12192         seq = stcb->asoc.str_reset_seq_out;
12193         if (can_send_out_req) {
12194                 int ret;
12195
12196                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12197                 if (ret) {
12198                         seq++;
12199                         asoc->stream_reset_outstanding++;
12200                 }
12201         }
12202         if ((add_stream & 1) &&
12203             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12204                 /* Need to allocate more */
12205                 struct sctp_stream_out *oldstream;
12206                 struct sctp_stream_queue_pending *sp, *nsp;
12207                 int i;
12208
12209 #if defined(SCTP_DETAILED_STR_STATS)
12210                 int j;
12211
12212 #endif
12213
12214                 oldstream = stcb->asoc.strmout;
12215                 /* get some more */
12216                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12217                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12218                     SCTP_M_STRMO);
12219                 if (stcb->asoc.strmout == NULL) {
12220                         uint8_t x;
12221
12222                         stcb->asoc.strmout = oldstream;
12223                         /* Turn off the bit */
12224                         x = add_stream & 0xfe;
12225                         add_stream = x;
12226                         goto skip_stuff;
12227                 }
12228                 /*
12229                  * Ok now we proceed with copying the old out stuff and
12230                  * initializing the new stuff.
12231                  */
12232                 SCTP_TCB_SEND_LOCK(stcb);
12233                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12234                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12235                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12236                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12237                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
12238                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12239                         stcb->asoc.strmout[i].stream_no = i;
12240                         stcb->asoc.strmout[i].state = oldstream[i].state;
12241                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12242                         /* now anything on those queues? */
12243                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12244                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12245                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12246                         }
12247                         /* Now move assoc pointers too */
12248                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12249                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12250                         }
12251                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12252                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12253                         }
12254                 }
12255                 /* now the new streams */
12256                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12257                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12258                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12259                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12260 #if defined(SCTP_DETAILED_STR_STATS)
12261                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12262                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12263                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12264                         }
12265 #else
12266                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12267                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12268 #endif
12269                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12270                         stcb->asoc.strmout[i].stream_no = i;
12271                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12272                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12273                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12274                 }
12275                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12276                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12277                 SCTP_TCB_SEND_UNLOCK(stcb);
12278         }
12279 skip_stuff:
12280         if ((add_stream & 1) && (adding_o > 0)) {
12281                 asoc->strm_pending_add_size = adding_o;
12282                 asoc->peer_req_out = peer_asked;
12283                 sctp_add_an_out_stream(chk, seq, adding_o);
12284                 seq++;
12285                 asoc->stream_reset_outstanding++;
12286         }
12287         if ((add_stream & 2) && (adding_i > 0)) {
12288                 sctp_add_an_in_stream(chk, seq, adding_i);
12289                 seq++;
12290                 asoc->stream_reset_outstanding++;
12291         }
12292         if (send_in_req) {
12293                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12294                 seq++;
12295                 asoc->stream_reset_outstanding++;
12296         }
12297         if (send_tsn_req) {
12298                 sctp_add_stream_reset_tsn(chk, seq);
12299                 asoc->stream_reset_outstanding++;
12300         }
12301         asoc->str_reset = chk;
12302         /* insert the chunk for sending */
12303         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12304             chk,
12305             sctp_next);
12306         asoc->ctrl_queue_cnt++;
12307         if (stcb->asoc.send_sack) {
12308                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12309         }
12310         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12311         return (0);
12312 }
12313
12314 void
12315 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12316     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12317     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12318     uint32_t vrf_id, uint16_t port)
12319 {
12320         /* Don't respond to an ABORT with an ABORT. */
12321         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12322                 if (cause)
12323                         sctp_m_freem(cause);
12324                 return;
12325         }
12326         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12327             mflowtype, mflowid, fibnum,
12328             vrf_id, port);
12329         return;
12330 }
12331
12332 void
12333 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12334     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12335     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12336     uint32_t vrf_id, uint16_t port)
12337 {
12338         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12339             mflowtype, mflowid, fibnum,
12340             vrf_id, port);
12341         return;
12342 }
12343
12344 static struct mbuf *
12345 sctp_copy_resume(struct uio *uio,
12346     int max_send_len,
12347     int user_marks_eor,
12348     int *error,
12349     uint32_t * sndout,
12350     struct mbuf **new_tail)
12351 {
12352         struct mbuf *m;
12353
12354         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12355             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12356         if (m == NULL) {
12357                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12358                 *error = ENOBUFS;
12359         } else {
12360                 *sndout = m_length(m, NULL);
12361                 *new_tail = m_last(m);
12362         }
12363         return (m);
12364 }
12365
12366 static int
12367 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12368     struct uio *uio,
12369     int resv_upfront)
12370 {
12371         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12372             resv_upfront, 0);
12373         if (sp->data == NULL) {
12374                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12375                 return (ENOBUFS);
12376         }
12377         sp->tail_mbuf = m_last(sp->data);
12378         return (0);
12379 }
12380
12381
12382
12383 static struct sctp_stream_queue_pending *
12384 sctp_copy_it_in(struct sctp_tcb *stcb,
12385     struct sctp_association *asoc,
12386     struct sctp_sndrcvinfo *srcv,
12387     struct uio *uio,
12388     struct sctp_nets *net,
12389     int max_send_len,
12390     int user_marks_eor,
12391     int *error)
12392 {
12393         /*-
12394          * This routine must be very careful in its work. Protocol
12395          * processing is up and running so care must be taken to spl...()
12396          * when you need to do something that may effect the stcb/asoc. The
12397          * sb is locked however. When data is copied the protocol processing
12398          * should be enabled since this is a slower operation...
12399          */
12400         struct sctp_stream_queue_pending *sp = NULL;
12401         int resv_in_first;
12402
12403         *error = 0;
12404         /* Now can we send this? */
12405         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12406             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12407             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12408             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12409                 /* got data while shutting down */
12410                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12411                 *error = ECONNRESET;
12412                 goto out_now;
12413         }
12414         sctp_alloc_a_strmoq(stcb, sp);
12415         if (sp == NULL) {
12416                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12417                 *error = ENOMEM;
12418                 goto out_now;
12419         }
12420         sp->act_flags = 0;
12421         sp->sender_all_done = 0;
12422         sp->sinfo_flags = srcv->sinfo_flags;
12423         sp->timetolive = srcv->sinfo_timetolive;
12424         sp->ppid = srcv->sinfo_ppid;
12425         sp->context = srcv->sinfo_context;
12426         sp->fsn = 0;
12427         sp->msg_id = atomic_fetchadd_int(&stcb->asoc.assoc_msg_id, 1);
12428         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12429
12430         sp->stream = srcv->sinfo_stream;
12431         sp->length = (uint32_t) min(uio->uio_resid, max_send_len);
12432         if ((sp->length == (uint32_t) uio->uio_resid) &&
12433             ((user_marks_eor == 0) ||
12434             (srcv->sinfo_flags & SCTP_EOF) ||
12435             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12436                 sp->msg_is_complete = 1;
12437         } else {
12438                 sp->msg_is_complete = 0;
12439         }
12440         sp->sender_all_done = 0;
12441         sp->some_taken = 0;
12442         sp->put_last_out = 0;
12443         resv_in_first = sizeof(struct sctp_data_chunk);
12444         sp->data = sp->tail_mbuf = NULL;
12445         if (sp->length == 0) {
12446                 *error = 0;
12447                 goto skip_copy;
12448         }
12449         if (srcv->sinfo_keynumber_valid) {
12450                 sp->auth_keyid = srcv->sinfo_keynumber;
12451         } else {
12452                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12453         }
12454         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12455                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12456                 sp->holds_key_ref = 1;
12457         }
12458         *error = sctp_copy_one(sp, uio, resv_in_first);
12459 skip_copy:
12460         if (*error) {
12461                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12462                 sp = NULL;
12463         } else {
12464                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12465                         sp->net = net;
12466                         atomic_add_int(&sp->net->ref_count, 1);
12467                 } else {
12468                         sp->net = NULL;
12469                 }
12470                 sctp_set_prsctp_policy(sp);
12471         }
12472 out_now:
12473         return (sp);
12474 }
12475
12476
12477 int
12478 sctp_sosend(struct socket *so,
12479     struct sockaddr *addr,
12480     struct uio *uio,
12481     struct mbuf *top,
12482     struct mbuf *control,
12483     int flags,
12484     struct thread *p
12485 )
12486 {
12487         int error, use_sndinfo = 0;
12488         struct sctp_sndrcvinfo sndrcvninfo;
12489         struct sockaddr *addr_to_use;
12490
12491 #if defined(INET) && defined(INET6)
12492         struct sockaddr_in sin;
12493
12494 #endif
12495
12496         if (control) {
12497                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12498                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12499                     sizeof(sndrcvninfo))) {
12500                         /* got one */
12501                         use_sndinfo = 1;
12502                 }
12503         }
12504         addr_to_use = addr;
12505 #if defined(INET) && defined(INET6)
12506         if ((addr) && (addr->sa_family == AF_INET6)) {
12507                 struct sockaddr_in6 *sin6;
12508
12509                 sin6 = (struct sockaddr_in6 *)addr;
12510                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12511                         in6_sin6_2_sin(&sin, sin6);
12512                         addr_to_use = (struct sockaddr *)&sin;
12513                 }
12514         }
12515 #endif
12516         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12517             control,
12518             flags,
12519             use_sndinfo ? &sndrcvninfo : NULL
12520             ,p
12521             );
12522         return (error);
12523 }
12524
12525
12526 int
12527 sctp_lower_sosend(struct socket *so,
12528     struct sockaddr *addr,
12529     struct uio *uio,
12530     struct mbuf *i_pak,
12531     struct mbuf *control,
12532     int flags,
12533     struct sctp_sndrcvinfo *srcv
12534     ,
12535     struct thread *p
12536 )
12537 {
12538         unsigned int sndlen = 0, max_len;
12539         int error, len;
12540         struct mbuf *top = NULL;
12541         int queue_only = 0, queue_only_for_init = 0;
12542         int free_cnt_applied = 0;
12543         int un_sent;
12544         int now_filled = 0;
12545         unsigned int inqueue_bytes = 0;
12546         struct sctp_block_entry be;
12547         struct sctp_inpcb *inp;
12548         struct sctp_tcb *stcb = NULL;
12549         struct timeval now;
12550         struct sctp_nets *net;
12551         struct sctp_association *asoc;
12552         struct sctp_inpcb *t_inp;
12553         int user_marks_eor;
12554         int create_lock_applied = 0;
12555         int nagle_applies = 0;
12556         int some_on_control = 0;
12557         int got_all_of_the_send = 0;
12558         int hold_tcblock = 0;
12559         int non_blocking = 0;
12560         uint32_t local_add_more, local_soresv = 0;
12561         uint16_t port;
12562         uint16_t sinfo_flags;
12563         sctp_assoc_t sinfo_assoc_id;
12564
12565         error = 0;
12566         net = NULL;
12567         stcb = NULL;
12568         asoc = NULL;
12569
12570         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12571         if (inp == NULL) {
12572                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12573                 error = EINVAL;
12574                 if (i_pak) {
12575                         SCTP_RELEASE_PKT(i_pak);
12576                 }
12577                 return (error);
12578         }
12579         if ((uio == NULL) && (i_pak == NULL)) {
12580                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12581                 return (EINVAL);
12582         }
12583         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12584         atomic_add_int(&inp->total_sends, 1);
12585         if (uio) {
12586                 if (uio->uio_resid < 0) {
12587                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12588                         return (EINVAL);
12589                 }
12590                 sndlen = (unsigned int)uio->uio_resid;
12591         } else {
12592                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12593                 sndlen = SCTP_HEADER_LEN(i_pak);
12594         }
12595         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12596             (void *)addr,
12597             sndlen);
12598         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12599             (inp->sctp_socket->so_qlimit)) {
12600                 /* The listener can NOT send */
12601                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12602                 error = ENOTCONN;
12603                 goto out_unlocked;
12604         }
12605         /**
12606          * Pre-screen address, if one is given the sin-len
12607          * must be set correctly!
12608          */
12609         if (addr) {
12610                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12611
12612                 switch (raddr->sa.sa_family) {
12613 #ifdef INET
12614                 case AF_INET:
12615                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12616                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12617                                 error = EINVAL;
12618                                 goto out_unlocked;
12619                         }
12620                         port = raddr->sin.sin_port;
12621                         break;
12622 #endif
12623 #ifdef INET6
12624                 case AF_INET6:
12625                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12626                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12627                                 error = EINVAL;
12628                                 goto out_unlocked;
12629                         }
12630                         port = raddr->sin6.sin6_port;
12631                         break;
12632 #endif
12633                 default:
12634                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12635                         error = EAFNOSUPPORT;
12636                         goto out_unlocked;
12637                 }
12638         } else
12639                 port = 0;
12640
12641         if (srcv) {
12642                 sinfo_flags = srcv->sinfo_flags;
12643                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12644                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12645                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12646                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12647                         error = EINVAL;
12648                         goto out_unlocked;
12649                 }
12650                 if (srcv->sinfo_flags)
12651                         SCTP_STAT_INCR(sctps_sends_with_flags);
12652         } else {
12653                 sinfo_flags = inp->def_send.sinfo_flags;
12654                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12655         }
12656         if (sinfo_flags & SCTP_SENDALL) {
12657                 /* its a sendall */
12658                 error = sctp_sendall(inp, uio, top, srcv);
12659                 top = NULL;
12660                 goto out_unlocked;
12661         }
12662         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12663                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12664                 error = EINVAL;
12665                 goto out_unlocked;
12666         }
12667         /* now we must find the assoc */
12668         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12669             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12670                 SCTP_INP_RLOCK(inp);
12671                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12672                 if (stcb) {
12673                         SCTP_TCB_LOCK(stcb);
12674                         hold_tcblock = 1;
12675                 }
12676                 SCTP_INP_RUNLOCK(inp);
12677         } else if (sinfo_assoc_id) {
12678                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12679         } else if (addr) {
12680                 /*-
12681                  * Since we did not use findep we must
12682                  * increment it, and if we don't find a tcb
12683                  * decrement it.
12684                  */
12685                 SCTP_INP_WLOCK(inp);
12686                 SCTP_INP_INCR_REF(inp);
12687                 SCTP_INP_WUNLOCK(inp);
12688                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12689                 if (stcb == NULL) {
12690                         SCTP_INP_WLOCK(inp);
12691                         SCTP_INP_DECR_REF(inp);
12692                         SCTP_INP_WUNLOCK(inp);
12693                 } else {
12694                         hold_tcblock = 1;
12695                 }
12696         }
12697         if ((stcb == NULL) && (addr)) {
12698                 /* Possible implicit send? */
12699                 SCTP_ASOC_CREATE_LOCK(inp);
12700                 create_lock_applied = 1;
12701                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12702                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12703                         /* Should I really unlock ? */
12704                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12705                         error = EINVAL;
12706                         goto out_unlocked;
12707
12708                 }
12709                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12710                     (addr->sa_family == AF_INET6)) {
12711                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12712                         error = EINVAL;
12713                         goto out_unlocked;
12714                 }
12715                 SCTP_INP_WLOCK(inp);
12716                 SCTP_INP_INCR_REF(inp);
12717                 SCTP_INP_WUNLOCK(inp);
12718                 /* With the lock applied look again */
12719                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12720                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12721                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12722                 }
12723                 if (stcb == NULL) {
12724                         SCTP_INP_WLOCK(inp);
12725                         SCTP_INP_DECR_REF(inp);
12726                         SCTP_INP_WUNLOCK(inp);
12727                 } else {
12728                         hold_tcblock = 1;
12729                 }
12730                 if (error) {
12731                         goto out_unlocked;
12732                 }
12733                 if (t_inp != inp) {
12734                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12735                         error = ENOTCONN;
12736                         goto out_unlocked;
12737                 }
12738         }
12739         if (stcb == NULL) {
12740                 if (addr == NULL) {
12741                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12742                         error = ENOENT;
12743                         goto out_unlocked;
12744                 } else {
12745                         /* We must go ahead and start the INIT process */
12746                         uint32_t vrf_id;
12747
12748                         if ((sinfo_flags & SCTP_ABORT) ||
12749                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12750                                 /*-
12751                                  * User asks to abort a non-existant assoc,
12752                                  * or EOF a non-existant assoc with no data
12753                                  */
12754                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12755                                 error = ENOENT;
12756                                 goto out_unlocked;
12757                         }
12758                         /* get an asoc/stcb struct */
12759                         vrf_id = inp->def_vrf_id;
12760 #ifdef INVARIANTS
12761                         if (create_lock_applied == 0) {
12762                                 panic("Error, should hold create lock and I don't?");
12763                         }
12764 #endif
12765                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12766                             inp->sctp_ep.pre_open_stream_count,
12767                             p
12768                             );
12769                         if (stcb == NULL) {
12770                                 /* Error is setup for us in the call */
12771                                 goto out_unlocked;
12772                         }
12773                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12774                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12775                                 /*
12776                                  * Set the connected flag so we can queue
12777                                  * data
12778                                  */
12779                                 soisconnecting(so);
12780                         }
12781                         hold_tcblock = 1;
12782                         if (create_lock_applied) {
12783                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12784                                 create_lock_applied = 0;
12785                         } else {
12786                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12787                         }
12788                         /*
12789                          * Turn on queue only flag to prevent data from
12790                          * being sent
12791                          */
12792                         queue_only = 1;
12793                         asoc = &stcb->asoc;
12794                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12795                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12796
12797                         /* initialize authentication params for the assoc */
12798                         sctp_initialize_auth_params(inp, stcb);
12799
12800                         if (control) {
12801                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12802                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12803                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12804                                         hold_tcblock = 0;
12805                                         stcb = NULL;
12806                                         goto out_unlocked;
12807                                 }
12808                         }
12809                         /* out with the INIT */
12810                         queue_only_for_init = 1;
12811                         /*-
12812                          * we may want to dig in after this call and adjust the MTU
12813                          * value. It defaulted to 1500 (constant) but the ro
12814                          * structure may now have an update and thus we may need to
12815                          * change it BEFORE we append the message.
12816                          */
12817                 }
12818         } else
12819                 asoc = &stcb->asoc;
12820         if (srcv == NULL)
12821                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12822         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12823                 if (addr)
12824                         net = sctp_findnet(stcb, addr);
12825                 else
12826                         net = NULL;
12827                 if ((net == NULL) ||
12828                     ((port != 0) && (port != stcb->rport))) {
12829                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12830                         error = EINVAL;
12831                         goto out_unlocked;
12832                 }
12833         } else {
12834                 if (stcb->asoc.alternate) {
12835                         net = stcb->asoc.alternate;
12836                 } else {
12837                         net = stcb->asoc.primary_destination;
12838                 }
12839         }
12840         atomic_add_int(&stcb->total_sends, 1);
12841         /* Keep the stcb from being freed under our feet */
12842         atomic_add_int(&asoc->refcnt, 1);
12843         free_cnt_applied = 1;
12844
12845         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12846                 if (sndlen > asoc->smallest_mtu) {
12847                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12848                         error = EMSGSIZE;
12849                         goto out_unlocked;
12850                 }
12851         }
12852         if (SCTP_SO_IS_NBIO(so)
12853             || (flags & MSG_NBIO)
12854             ) {
12855                 non_blocking = 1;
12856         }
12857         /* would we block? */
12858         if (non_blocking) {
12859                 if (hold_tcblock == 0) {
12860                         SCTP_TCB_LOCK(stcb);
12861                         hold_tcblock = 1;
12862                 }
12863                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12864                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12865                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12866                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12867                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12868                                 error = EMSGSIZE;
12869                         else
12870                                 error = EWOULDBLOCK;
12871                         goto out_unlocked;
12872                 }
12873                 stcb->asoc.sb_send_resv += sndlen;
12874                 SCTP_TCB_UNLOCK(stcb);
12875                 hold_tcblock = 0;
12876         } else {
12877                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12878         }
12879         local_soresv = sndlen;
12880         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12881                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12882                 error = ECONNRESET;
12883                 goto out_unlocked;
12884         }
12885         if (create_lock_applied) {
12886                 SCTP_ASOC_CREATE_UNLOCK(inp);
12887                 create_lock_applied = 0;
12888         }
12889         /* Is the stream no. valid? */
12890         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12891                 /* Invalid stream number */
12892                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12893                 error = EINVAL;
12894                 goto out_unlocked;
12895         }
12896         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12897             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12898                 /*
12899                  * Can't queue any data while stream reset is underway.
12900                  */
12901                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12902                         error = EAGAIN;
12903                 } else {
12904                         error = EINVAL;
12905                 }
12906                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12907                 goto out_unlocked;
12908         }
12909         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12910             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12911                 queue_only = 1;
12912         }
12913         /* we are now done with all control */
12914         if (control) {
12915                 sctp_m_freem(control);
12916                 control = NULL;
12917         }
12918         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12919             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12920             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12921             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12922                 if (srcv->sinfo_flags & SCTP_ABORT) {
12923                         ;
12924                 } else {
12925                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12926                         error = ECONNRESET;
12927                         goto out_unlocked;
12928                 }
12929         }
12930         /* Ok, we will attempt a msgsnd :> */
12931         if (p) {
12932                 p->td_ru.ru_msgsnd++;
12933         }
12934         /* Are we aborting? */
12935         if (srcv->sinfo_flags & SCTP_ABORT) {
12936                 struct mbuf *mm;
12937                 int tot_demand, tot_out = 0, max_out;
12938
12939                 SCTP_STAT_INCR(sctps_sends_with_abort);
12940                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12941                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12942                         /* It has to be up before we abort */
12943                         /* how big is the user initiated abort? */
12944                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12945                         error = EINVAL;
12946                         goto out;
12947                 }
12948                 if (hold_tcblock) {
12949                         SCTP_TCB_UNLOCK(stcb);
12950                         hold_tcblock = 0;
12951                 }
12952                 if (top) {
12953                         struct mbuf *cntm = NULL;
12954
12955                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12956                         if (sndlen != 0) {
12957                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12958                                         tot_out += SCTP_BUF_LEN(cntm);
12959                                 }
12960                         }
12961                 } else {
12962                         /* Must fit in a MTU */
12963                         tot_out = sndlen;
12964                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12965                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12966                                 /* To big */
12967                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12968                                 error = EMSGSIZE;
12969                                 goto out;
12970                         }
12971                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12972                 }
12973                 if (mm == NULL) {
12974                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12975                         error = ENOMEM;
12976                         goto out;
12977                 }
12978                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12979                 max_out -= sizeof(struct sctp_abort_msg);
12980                 if (tot_out > max_out) {
12981                         tot_out = max_out;
12982                 }
12983                 if (mm) {
12984                         struct sctp_paramhdr *ph;
12985
12986                         /* now move forward the data pointer */
12987                         ph = mtod(mm, struct sctp_paramhdr *);
12988                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12989                         ph->param_length = htons((uint16_t) (sizeof(struct sctp_paramhdr) + tot_out));
12990                         ph++;
12991                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12992                         if (top == NULL) {
12993                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12994                                 if (error) {
12995                                         /*-
12996                                          * Here if we can't get his data we
12997                                          * still abort we just don't get to
12998                                          * send the users note :-0
12999                                          */
13000                                         sctp_m_freem(mm);
13001                                         mm = NULL;
13002                                 }
13003                         } else {
13004                                 if (sndlen != 0) {
13005                                         SCTP_BUF_NEXT(mm) = top;
13006                                 }
13007                         }
13008                 }
13009                 if (hold_tcblock == 0) {
13010                         SCTP_TCB_LOCK(stcb);
13011                 }
13012                 atomic_add_int(&stcb->asoc.refcnt, -1);
13013                 free_cnt_applied = 0;
13014                 /* release this lock, otherwise we hang on ourselves */
13015                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13016                 /* now relock the stcb so everything is sane */
13017                 hold_tcblock = 0;
13018                 stcb = NULL;
13019                 /*
13020                  * In this case top is already chained to mm avoid double
13021                  * free, since we free it below if top != NULL and driver
13022                  * would free it after sending the packet out
13023                  */
13024                 if (sndlen != 0) {
13025                         top = NULL;
13026                 }
13027                 goto out_unlocked;
13028         }
13029         /* Calculate the maximum we can send */
13030         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13031         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13032                 if (non_blocking) {
13033                         /* we already checked for non-blocking above. */
13034                         max_len = sndlen;
13035                 } else {
13036                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13037                 }
13038         } else {
13039                 max_len = 0;
13040         }
13041         if (hold_tcblock) {
13042                 SCTP_TCB_UNLOCK(stcb);
13043                 hold_tcblock = 0;
13044         }
13045         if (asoc->strmout == NULL) {
13046                 /* huh? software error */
13047                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13048                 error = EFAULT;
13049                 goto out_unlocked;
13050         }
13051         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13052         if ((user_marks_eor == 0) &&
13053             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13054                 /* It will NEVER fit */
13055                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13056                 error = EMSGSIZE;
13057                 goto out_unlocked;
13058         }
13059         if ((uio == NULL) && user_marks_eor) {
13060                 /*-
13061                  * We do not support eeor mode for
13062                  * sending with mbuf chains (like sendfile).
13063                  */
13064                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13065                 error = EINVAL;
13066                 goto out_unlocked;
13067         }
13068         if (user_marks_eor) {
13069                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13070         } else {
13071                 /*-
13072                  * For non-eeor the whole message must fit in
13073                  * the socket send buffer.
13074                  */
13075                 local_add_more = sndlen;
13076         }
13077         len = 0;
13078         if (non_blocking) {
13079                 goto skip_preblock;
13080         }
13081         if (((max_len <= local_add_more) &&
13082             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13083             (max_len == 0) ||
13084             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13085                 /* No room right now ! */
13086                 SOCKBUF_LOCK(&so->so_snd);
13087                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13088                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13089                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13090                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13091                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13092                             inqueue_bytes,
13093                             local_add_more,
13094                             stcb->asoc.stream_queue_cnt,
13095                             stcb->asoc.chunks_on_out_queue,
13096                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13097                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13098                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13099                         }
13100                         be.error = 0;
13101                         stcb->block_entry = &be;
13102                         error = sbwait(&so->so_snd);
13103                         stcb->block_entry = NULL;
13104                         if (error || so->so_error || be.error) {
13105                                 if (error == 0) {
13106                                         if (so->so_error)
13107                                                 error = so->so_error;
13108                                         if (be.error) {
13109                                                 error = be.error;
13110                                         }
13111                                 }
13112                                 SOCKBUF_UNLOCK(&so->so_snd);
13113                                 goto out_unlocked;
13114                         }
13115                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13116                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13117                                     asoc, stcb->asoc.total_output_queue_size);
13118                         }
13119                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13120                                 goto out_unlocked;
13121                         }
13122                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13123                 }
13124                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13125                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13126                 } else {
13127                         max_len = 0;
13128                 }
13129                 SOCKBUF_UNLOCK(&so->so_snd);
13130         }
13131 skip_preblock:
13132         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13133                 goto out_unlocked;
13134         }
13135         /*
13136          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13137          * case NOTE: uio will be null when top/mbuf is passed
13138          */
13139         if (sndlen == 0) {
13140                 if (srcv->sinfo_flags & SCTP_EOF) {
13141                         got_all_of_the_send = 1;
13142                         goto dataless_eof;
13143                 } else {
13144                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13145                         error = EINVAL;
13146                         goto out;
13147                 }
13148         }
13149         if (top == NULL) {
13150                 struct sctp_stream_queue_pending *sp;
13151                 struct sctp_stream_out *strm;
13152                 uint32_t sndout;
13153
13154                 SCTP_TCB_SEND_LOCK(stcb);
13155                 if ((asoc->stream_locked) &&
13156                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13157                         SCTP_TCB_SEND_UNLOCK(stcb);
13158                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13159                         error = EINVAL;
13160                         goto out;
13161                 }
13162                 SCTP_TCB_SEND_UNLOCK(stcb);
13163
13164                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13165                 if (strm->last_msg_incomplete == 0) {
13166         do_a_copy_in:
13167                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13168                         if ((sp == NULL) || (error)) {
13169                                 goto out;
13170                         }
13171                         SCTP_TCB_SEND_LOCK(stcb);
13172                         if (sp->msg_is_complete) {
13173                                 strm->last_msg_incomplete = 0;
13174                                 asoc->stream_locked = 0;
13175                         } else {
13176                                 /*
13177                                  * Just got locked to this guy in case of an
13178                                  * interrupt.
13179                                  */
13180                                 strm->last_msg_incomplete = 1;
13181                                 if (stcb->asoc.idata_supported == 0) {
13182                                         asoc->stream_locked = 1;
13183                                         asoc->stream_locked_on = srcv->sinfo_stream;
13184                                 }
13185                                 sp->sender_all_done = 0;
13186                         }
13187                         sctp_snd_sb_alloc(stcb, sp->length);
13188                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13189                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13190                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13191                         }
13192                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13193                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13194                         SCTP_TCB_SEND_UNLOCK(stcb);
13195                 } else {
13196                         SCTP_TCB_SEND_LOCK(stcb);
13197                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13198                         SCTP_TCB_SEND_UNLOCK(stcb);
13199                         if (sp == NULL) {
13200                                 /* ???? Huh ??? last msg is gone */
13201 #ifdef INVARIANTS
13202                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13203 #else
13204                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13205                                 strm->last_msg_incomplete = 0;
13206 #endif
13207                                 goto do_a_copy_in;
13208
13209                         }
13210                 }
13211                 while (uio->uio_resid > 0) {
13212                         /* How much room do we have? */
13213                         struct mbuf *new_tail, *mm;
13214
13215                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13216                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13217                         else
13218                                 max_len = 0;
13219
13220                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13221                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13222                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13223                                 sndout = 0;
13224                                 new_tail = NULL;
13225                                 if (hold_tcblock) {
13226                                         SCTP_TCB_UNLOCK(stcb);
13227                                         hold_tcblock = 0;
13228                                 }
13229                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13230                                 if ((mm == NULL) || error) {
13231                                         if (mm) {
13232                                                 sctp_m_freem(mm);
13233                                         }
13234                                         goto out;
13235                                 }
13236                                 /* Update the mbuf and count */
13237                                 SCTP_TCB_SEND_LOCK(stcb);
13238                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13239                                         /*
13240                                          * we need to get out. Peer probably
13241                                          * aborted.
13242                                          */
13243                                         sctp_m_freem(mm);
13244                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13245                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13246                                                 error = ECONNRESET;
13247                                         }
13248                                         SCTP_TCB_SEND_UNLOCK(stcb);
13249                                         goto out;
13250                                 }
13251                                 if (sp->tail_mbuf) {
13252                                         /* tack it to the end */
13253                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13254                                         sp->tail_mbuf = new_tail;
13255                                 } else {
13256                                         /* A stolen mbuf */
13257                                         sp->data = mm;
13258                                         sp->tail_mbuf = new_tail;
13259                                 }
13260                                 sctp_snd_sb_alloc(stcb, sndout);
13261                                 atomic_add_int(&sp->length, sndout);
13262                                 len += sndout;
13263
13264                                 /* Did we reach EOR? */
13265                                 if ((uio->uio_resid == 0) &&
13266                                     ((user_marks_eor == 0) ||
13267                                     (srcv->sinfo_flags & SCTP_EOF) ||
13268                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13269                                         sp->msg_is_complete = 1;
13270                                 } else {
13271                                         sp->msg_is_complete = 0;
13272                                 }
13273                                 SCTP_TCB_SEND_UNLOCK(stcb);
13274                         }
13275                         if (uio->uio_resid == 0) {
13276                                 /* got it all? */
13277                                 continue;
13278                         }
13279                         /* PR-SCTP? */
13280                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13281                                 /*
13282                                  * This is ugly but we must assure locking
13283                                  * order
13284                                  */
13285                                 if (hold_tcblock == 0) {
13286                                         SCTP_TCB_LOCK(stcb);
13287                                         hold_tcblock = 1;
13288                                 }
13289                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13290                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13291                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13292                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13293                                 else
13294                                         max_len = 0;
13295                                 if (max_len > 0) {
13296                                         continue;
13297                                 }
13298                                 SCTP_TCB_UNLOCK(stcb);
13299                                 hold_tcblock = 0;
13300                         }
13301                         /* wait for space now */
13302                         if (non_blocking) {
13303                                 /* Non-blocking io in place out */
13304                                 goto skip_out_eof;
13305                         }
13306                         /* What about the INIT, send it maybe */
13307                         if (queue_only_for_init) {
13308                                 if (hold_tcblock == 0) {
13309                                         SCTP_TCB_LOCK(stcb);
13310                                         hold_tcblock = 1;
13311                                 }
13312                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13313                                         /* a collision took us forward? */
13314                                         queue_only = 0;
13315                                 } else {
13316                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13317                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13318                                         queue_only = 1;
13319                                 }
13320                         }
13321                         if ((net->flight_size > net->cwnd) &&
13322                             (asoc->sctp_cmt_on_off == 0)) {
13323                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13324                                 queue_only = 1;
13325                         } else if (asoc->ifp_had_enobuf) {
13326                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13327                                 if (net->flight_size > (2 * net->mtu)) {
13328                                         queue_only = 1;
13329                                 }
13330                                 asoc->ifp_had_enobuf = 0;
13331                         }
13332                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13333                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13334                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13335                             (stcb->asoc.total_flight > 0) &&
13336                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13337                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13338
13339                                 /*-
13340                                  * Ok, Nagle is set on and we have data outstanding.
13341                                  * Don't send anything and let SACKs drive out the
13342                                  * data unless we have a "full" segment to send.
13343                                  */
13344                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13345                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13346                                 }
13347                                 SCTP_STAT_INCR(sctps_naglequeued);
13348                                 nagle_applies = 1;
13349                         } else {
13350                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13351                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13352                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13353                                 }
13354                                 SCTP_STAT_INCR(sctps_naglesent);
13355                                 nagle_applies = 0;
13356                         }
13357                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13358
13359                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13360                                     nagle_applies, un_sent);
13361                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13362                                     stcb->asoc.total_flight,
13363                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13364                         }
13365                         if (queue_only_for_init)
13366                                 queue_only_for_init = 0;
13367                         if ((queue_only == 0) && (nagle_applies == 0)) {
13368                                 /*-
13369                                  * need to start chunk output
13370                                  * before blocking.. note that if
13371                                  * a lock is already applied, then
13372                                  * the input via the net is happening
13373                                  * and I don't need to start output :-D
13374                                  */
13375                                 if (hold_tcblock == 0) {
13376                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13377                                                 hold_tcblock = 1;
13378                                                 sctp_chunk_output(inp,
13379                                                     stcb,
13380                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13381                                         }
13382                                 } else {
13383                                         sctp_chunk_output(inp,
13384                                             stcb,
13385                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13386                                 }
13387                                 if (hold_tcblock == 1) {
13388                                         SCTP_TCB_UNLOCK(stcb);
13389                                         hold_tcblock = 0;
13390                                 }
13391                         }
13392                         SOCKBUF_LOCK(&so->so_snd);
13393                         /*-
13394                          * This is a bit strange, but I think it will
13395                          * work. The total_output_queue_size is locked and
13396                          * protected by the TCB_LOCK, which we just released.
13397                          * There is a race that can occur between releasing it
13398                          * above, and me getting the socket lock, where sacks
13399                          * come in but we have not put the SB_WAIT on the
13400                          * so_snd buffer to get the wakeup. After the LOCK
13401                          * is applied the sack_processing will also need to
13402                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13403                          * once we have the socket buffer lock if we recheck the
13404                          * size we KNOW we will get to sleep safely with the
13405                          * wakeup flag in place.
13406                          */
13407                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13408                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13409                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13410                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13411                                             asoc, (size_t)uio->uio_resid);
13412                                 }
13413                                 be.error = 0;
13414                                 stcb->block_entry = &be;
13415                                 error = sbwait(&so->so_snd);
13416                                 stcb->block_entry = NULL;
13417
13418                                 if (error || so->so_error || be.error) {
13419                                         if (error == 0) {
13420                                                 if (so->so_error)
13421                                                         error = so->so_error;
13422                                                 if (be.error) {
13423                                                         error = be.error;
13424                                                 }
13425                                         }
13426                                         SOCKBUF_UNLOCK(&so->so_snd);
13427                                         goto out_unlocked;
13428                                 }
13429                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13430                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13431                                             asoc, stcb->asoc.total_output_queue_size);
13432                                 }
13433                         }
13434                         SOCKBUF_UNLOCK(&so->so_snd);
13435                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13436                                 goto out_unlocked;
13437                         }
13438                 }
13439                 SCTP_TCB_SEND_LOCK(stcb);
13440                 if (sp) {
13441                         if (sp->msg_is_complete == 0) {
13442                                 strm->last_msg_incomplete = 1;
13443                                 if (stcb->asoc.idata_supported == 0) {
13444                                         asoc->stream_locked = 1;
13445                                         asoc->stream_locked_on = srcv->sinfo_stream;
13446                                 }
13447                         } else {
13448                                 sp->sender_all_done = 1;
13449                                 strm->last_msg_incomplete = 0;
13450                                 asoc->stream_locked = 0;
13451                         }
13452                 } else {
13453                         SCTP_PRINTF("Huh no sp TSNH?\n");
13454                         strm->last_msg_incomplete = 0;
13455                         asoc->stream_locked = 0;
13456                 }
13457                 SCTP_TCB_SEND_UNLOCK(stcb);
13458                 if (uio->uio_resid == 0) {
13459                         got_all_of_the_send = 1;
13460                 }
13461         } else {
13462                 /* We send in a 0, since we do NOT have any locks */
13463                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13464                 top = NULL;
13465                 if (srcv->sinfo_flags & SCTP_EOF) {
13466                         /*
13467                          * This should only happen for Panda for the mbuf
13468                          * send case, which does NOT yet support EEOR mode.
13469                          * Thus, we can just set this flag to do the proper
13470                          * EOF handling.
13471                          */
13472                         got_all_of_the_send = 1;
13473                 }
13474         }
13475         if (error) {
13476                 goto out;
13477         }
13478 dataless_eof:
13479         /* EOF thing ? */
13480         if ((srcv->sinfo_flags & SCTP_EOF) &&
13481             (got_all_of_the_send == 1)) {
13482                 int cnt;
13483
13484                 SCTP_STAT_INCR(sctps_sends_with_eof);
13485                 error = 0;
13486                 if (hold_tcblock == 0) {
13487                         SCTP_TCB_LOCK(stcb);
13488                         hold_tcblock = 1;
13489                 }
13490                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13491                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13492                     TAILQ_EMPTY(&asoc->sent_queue) &&
13493                     (cnt == 0)) {
13494                         if (asoc->locked_on_sending) {
13495                                 goto abort_anyway;
13496                         }
13497                         /* there is nothing queued to send, so I'm done... */
13498                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13499                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13500                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13501                                 struct sctp_nets *netp;
13502
13503                                 /* only send SHUTDOWN the first time through */
13504                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13505                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13506                                 }
13507                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13508                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13509                                 sctp_stop_timers_for_shutdown(stcb);
13510                                 if (stcb->asoc.alternate) {
13511                                         netp = stcb->asoc.alternate;
13512                                 } else {
13513                                         netp = stcb->asoc.primary_destination;
13514                                 }
13515                                 sctp_send_shutdown(stcb, netp);
13516                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13517                                     netp);
13518                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13519                                     asoc->primary_destination);
13520                         }
13521                 } else {
13522                         /*-
13523                          * we still got (or just got) data to send, so set
13524                          * SHUTDOWN_PENDING
13525                          */
13526                         /*-
13527                          * XXX sockets draft says that SCTP_EOF should be
13528                          * sent with no data.  currently, we will allow user
13529                          * data to be sent first and move to
13530                          * SHUTDOWN-PENDING
13531                          */
13532                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13533                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13534                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13535                                 if (hold_tcblock == 0) {
13536                                         SCTP_TCB_LOCK(stcb);
13537                                         hold_tcblock = 1;
13538                                 }
13539                                 if (asoc->locked_on_sending) {
13540                                         /* Locked to send out the data */
13541                                         struct sctp_stream_queue_pending *sp;
13542
13543                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13544                                         if (sp) {
13545                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13546                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13547                                         }
13548                                 }
13549                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13550                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13551                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13552                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13553                                         struct mbuf *op_err;
13554                                         char msg[SCTP_DIAG_INFO_LEN];
13555
13556                         abort_anyway:
13557                                         if (free_cnt_applied) {
13558                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13559                                                 free_cnt_applied = 0;
13560                                         }
13561                                         snprintf(msg, sizeof(msg),
13562                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13563                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13564                                             msg);
13565                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13566                                             op_err, SCTP_SO_LOCKED);
13567                                         /*
13568                                          * now relock the stcb so everything
13569                                          * is sane
13570                                          */
13571                                         hold_tcblock = 0;
13572                                         stcb = NULL;
13573                                         goto out;
13574                                 }
13575                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13576                                     asoc->primary_destination);
13577                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13578                         }
13579                 }
13580         }
13581 skip_out_eof:
13582         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13583                 some_on_control = 1;
13584         }
13585         if (queue_only_for_init) {
13586                 if (hold_tcblock == 0) {
13587                         SCTP_TCB_LOCK(stcb);
13588                         hold_tcblock = 1;
13589                 }
13590                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13591                         /* a collision took us forward? */
13592                         queue_only = 0;
13593                 } else {
13594                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13595                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13596                         queue_only = 1;
13597                 }
13598         }
13599         if ((net->flight_size > net->cwnd) &&
13600             (stcb->asoc.sctp_cmt_on_off == 0)) {
13601                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13602                 queue_only = 1;
13603         } else if (asoc->ifp_had_enobuf) {
13604                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13605                 if (net->flight_size > (2 * net->mtu)) {
13606                         queue_only = 1;
13607                 }
13608                 asoc->ifp_had_enobuf = 0;
13609         }
13610         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13611             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13612         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13613             (stcb->asoc.total_flight > 0) &&
13614             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13615             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13616                 /*-
13617                  * Ok, Nagle is set on and we have data outstanding.
13618                  * Don't send anything and let SACKs drive out the
13619                  * data unless wen have a "full" segment to send.
13620                  */
13621                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13622                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13623                 }
13624                 SCTP_STAT_INCR(sctps_naglequeued);
13625                 nagle_applies = 1;
13626         } else {
13627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13628                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13629                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13630                 }
13631                 SCTP_STAT_INCR(sctps_naglesent);
13632                 nagle_applies = 0;
13633         }
13634         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13635                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13636                     nagle_applies, un_sent);
13637                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13638                     stcb->asoc.total_flight,
13639                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13640         }
13641         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13642                 /* we can attempt to send too. */
13643                 if (hold_tcblock == 0) {
13644                         /*
13645                          * If there is activity recv'ing sacks no need to
13646                          * send
13647                          */
13648                         if (SCTP_TCB_TRYLOCK(stcb)) {
13649                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13650                                 hold_tcblock = 1;
13651                         }
13652                 } else {
13653                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13654                 }
13655         } else if ((queue_only == 0) &&
13656                     (stcb->asoc.peers_rwnd == 0) &&
13657             (stcb->asoc.total_flight == 0)) {
13658                 /* We get to have a probe outstanding */
13659                 if (hold_tcblock == 0) {
13660                         hold_tcblock = 1;
13661                         SCTP_TCB_LOCK(stcb);
13662                 }
13663                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13664         } else if (some_on_control) {
13665                 int num_out, reason, frag_point;
13666
13667                 /* Here we do control only */
13668                 if (hold_tcblock == 0) {
13669                         hold_tcblock = 1;
13670                         SCTP_TCB_LOCK(stcb);
13671                 }
13672                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13673                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13674                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13675         }
13676         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13677             queue_only, stcb->asoc.peers_rwnd, un_sent,
13678             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13679             stcb->asoc.total_output_queue_size, error);
13680
13681 out:
13682 out_unlocked:
13683
13684         if (local_soresv && stcb) {
13685                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13686         }
13687         if (create_lock_applied) {
13688                 SCTP_ASOC_CREATE_UNLOCK(inp);
13689         }
13690         if ((stcb) && hold_tcblock) {
13691                 SCTP_TCB_UNLOCK(stcb);
13692         }
13693         if (stcb && free_cnt_applied) {
13694                 atomic_add_int(&stcb->asoc.refcnt, -1);
13695         }
13696 #ifdef INVARIANTS
13697         if (stcb) {
13698                 if (mtx_owned(&stcb->tcb_mtx)) {
13699                         panic("Leaving with tcb mtx owned?");
13700                 }
13701                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13702                         panic("Leaving with tcb send mtx owned?");
13703                 }
13704         }
13705 #endif
13706         if (top) {
13707                 sctp_m_freem(top);
13708         }
13709         if (control) {
13710                 sctp_m_freem(control);
13711         }
13712         return (error);
13713 }
13714
13715
13716 /*
13717  * generate an AUTHentication chunk, if required
13718  */
13719 struct mbuf *
13720 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13721     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13722     struct sctp_tcb *stcb, uint8_t chunk)
13723 {
13724         struct mbuf *m_auth;
13725         struct sctp_auth_chunk *auth;
13726         int chunk_len;
13727         struct mbuf *cn;
13728
13729         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13730             (stcb == NULL))
13731                 return (m);
13732
13733         if (stcb->asoc.auth_supported == 0) {
13734                 return (m);
13735         }
13736         /* does the requested chunk require auth? */
13737         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13738                 return (m);
13739         }
13740         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13741         if (m_auth == NULL) {
13742                 /* no mbuf's */
13743                 return (m);
13744         }
13745         /* reserve some space if this will be the first mbuf */
13746         if (m == NULL)
13747                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13748         /* fill in the AUTH chunk details */
13749         auth = mtod(m_auth, struct sctp_auth_chunk *);
13750         bzero(auth, sizeof(*auth));
13751         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13752         auth->ch.chunk_flags = 0;
13753         chunk_len = sizeof(*auth) +
13754             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13755         auth->ch.chunk_length = htons(chunk_len);
13756         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13757         /* key id and hmac digest will be computed and filled in upon send */
13758
13759         /* save the offset where the auth was inserted into the chain */
13760         *offset = 0;
13761         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13762                 *offset += SCTP_BUF_LEN(cn);
13763         }
13764
13765         /* update length and return pointer to the auth chunk */
13766         SCTP_BUF_LEN(m_auth) = chunk_len;
13767         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13768         if (auth_ret != NULL)
13769                 *auth_ret = auth;
13770
13771         return (m);
13772 }
13773
13774 #ifdef INET6
13775 int
13776 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13777 {
13778         struct nd_prefix *pfx = NULL;
13779         struct nd_pfxrouter *pfxrtr = NULL;
13780         struct sockaddr_in6 gw6;
13781
13782         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13783                 return (0);
13784
13785         /* get prefix entry of address */
13786         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13787                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13788                         continue;
13789                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13790                     &src6->sin6_addr, &pfx->ndpr_mask))
13791                         break;
13792         }
13793         /* no prefix entry in the prefix list */
13794         if (pfx == NULL) {
13795                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13796                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13797                 return (0);
13798         }
13799         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13800         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13801
13802         /* search installed gateway from prefix entry */
13803         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13804                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13805                 gw6.sin6_family = AF_INET6;
13806                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13807                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13808                     sizeof(struct in6_addr));
13809                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13810                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13811                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13812                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13813                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13814                     ro->ro_rt->rt_gateway)) {
13815                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13816                         return (1);
13817                 }
13818         }
13819         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13820         return (0);
13821 }
13822
13823 #endif
13824
13825 int
13826 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13827 {
13828 #ifdef INET
13829         struct sockaddr_in *sin, *mask;
13830         struct ifaddr *ifa;
13831         struct in_addr srcnetaddr, gwnetaddr;
13832
13833         if (ro == NULL || ro->ro_rt == NULL ||
13834             sifa->address.sa.sa_family != AF_INET) {
13835                 return (0);
13836         }
13837         ifa = (struct ifaddr *)sifa->ifa;
13838         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13839         sin = &sifa->address.sin;
13840         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13841         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13842         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13843         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13844
13845         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13846         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13847         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13848         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13849         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13850         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13851                 return (1);
13852         }
13853 #endif
13854         return (0);
13855 }