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 #endif
1947
1948         switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950         case AF_INET:
1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952                 break;
1953 #endif
1954 #ifdef INET6
1955         case AF_INET6:
1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957                 break;
1958 #endif
1959         default:
1960                 return (m);
1961         }
1962 #if defined(INET) || defined(INET6)
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = &ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = &ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 #endif
2024 }
2025
2026
2027 struct mbuf *
2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029     struct sctp_scoping *scope,
2030     struct mbuf *m_at, int cnt_inits_to,
2031     uint16_t *padding_len, uint16_t *chunk_len)
2032 {
2033         struct sctp_vrf *vrf = NULL;
2034         int cnt, limit_out = 0, total_count;
2035         uint32_t vrf_id;
2036
2037         vrf_id = inp->def_vrf_id;
2038         SCTP_IPI_ADDR_RLOCK();
2039         vrf = sctp_find_vrf(vrf_id);
2040         if (vrf == NULL) {
2041                 SCTP_IPI_ADDR_RUNLOCK();
2042                 return (m_at);
2043         }
2044         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045                 struct sctp_ifa *sctp_ifap;
2046                 struct sctp_ifn *sctp_ifnp;
2047
2048                 cnt = cnt_inits_to;
2049                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050                         limit_out = 1;
2051                         cnt = SCTP_ADDRESS_LIMIT;
2052                         goto skip_count;
2053                 }
2054                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055                         if ((scope->loopback_scope == 0) &&
2056                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057                                 /*
2058                                  * Skip loopback devices if loopback_scope
2059                                  * not set
2060                                  */
2061                                 continue;
2062                         }
2063                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064 #ifdef INET
2065                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
2068                                         continue;
2069                                 }
2070 #endif
2071 #ifdef INET6
2072                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075                                         continue;
2076                                 }
2077 #endif
2078                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079                                         continue;
2080                                 }
2081                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082                                         continue;
2083                                 }
2084                                 cnt++;
2085                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2086                                         break;
2087                                 }
2088                         }
2089                         if (cnt > SCTP_ADDRESS_LIMIT) {
2090                                 break;
2091                         }
2092                 }
2093 skip_count:
2094                 if (cnt > 1) {
2095                         total_count = 0;
2096                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097                                 cnt = 0;
2098                                 if ((scope->loopback_scope == 0) &&
2099                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100                                         /*
2101                                          * Skip loopback devices if
2102                                          * loopback_scope not set
2103                                          */
2104                                         continue;
2105                                 }
2106                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107 #ifdef INET
2108                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
2111                                                 continue;
2112                                         }
2113 #endif
2114 #ifdef INET6
2115                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118                                                 continue;
2119                                         }
2120 #endif
2121                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122                                                 continue;
2123                                         }
2124                                         if (sctp_is_address_in_scope(sctp_ifap,
2125                                             scope, 0) == 0) {
2126                                                 continue;
2127                                         }
2128                                         if ((chunk_len != NULL) &&
2129                                             (padding_len != NULL) &&
2130                                             (*padding_len > 0)) {
2131                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2133                                                 *chunk_len += *padding_len;
2134                                                 *padding_len = 0;
2135                                         }
2136                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137                                         if (limit_out) {
2138                                                 cnt++;
2139                                                 total_count++;
2140                                                 if (cnt >= 2) {
2141                                                         /*
2142                                                          * two from each
2143                                                          * address
2144                                                          */
2145                                                         break;
2146                                                 }
2147                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2148                                                         /* No more addresses */
2149                                                         break;
2150                                                 }
2151                                         }
2152                                 }
2153                         }
2154                 }
2155         } else {
2156                 struct sctp_laddr *laddr;
2157
2158                 cnt = cnt_inits_to;
2159                 /* First, how many ? */
2160                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161                         if (laddr->ifa == NULL) {
2162                                 continue;
2163                         }
2164                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165                                 /*
2166                                  * Address being deleted by the system, dont
2167                                  * list.
2168                                  */
2169                                 continue;
2170                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171                                 /*
2172                                  * Address being deleted on this ep don't
2173                                  * list.
2174                                  */
2175                                 continue;
2176                         }
2177                         if (sctp_is_address_in_scope(laddr->ifa,
2178                             scope, 1) == 0) {
2179                                 continue;
2180                         }
2181                         cnt++;
2182                 }
2183                 /*
2184                  * To get through a NAT we only list addresses if we have
2185                  * more than one. That way if you just bind a single address
2186                  * we let the source of the init dictate our address.
2187                  */
2188                 if (cnt > 1) {
2189                         cnt = cnt_inits_to;
2190                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191                                 if (laddr->ifa == NULL) {
2192                                         continue;
2193                                 }
2194                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195                                         continue;
2196                                 }
2197                                 if (sctp_is_address_in_scope(laddr->ifa,
2198                                     scope, 0) == 0) {
2199                                         continue;
2200                                 }
2201                                 if ((chunk_len != NULL) &&
2202                                     (padding_len != NULL) &&
2203                                     (*padding_len > 0)) {
2204                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205                                         SCTP_BUF_LEN(m_at) += *padding_len;
2206                                         *chunk_len += *padding_len;
2207                                         *padding_len = 0;
2208                                 }
2209                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210                                 cnt++;
2211                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2212                                         break;
2213                                 }
2214                         }
2215                 }
2216         }
2217         SCTP_IPI_ADDR_RUNLOCK();
2218         return (m_at);
2219 }
2220
2221 static struct sctp_ifa *
2222 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223     uint8_t dest_is_loop,
2224     uint8_t dest_is_priv,
2225     sa_family_t fam)
2226 {
2227         uint8_t dest_is_global = 0;
2228
2229         /* dest_is_priv is true if destination is a private address */
2230         /* dest_is_loop is true if destination is a loopback addresses */
2231
2232         /**
2233          * Here we determine if its a preferred address. A preferred address
2234          * means it is the same scope or higher scope then the destination.
2235          * L = loopback, P = private, G = global
2236          * -----------------------------------------
2237          *    src    |  dest | result
2238          *  ----------------------------------------
2239          *     L     |    L  |    yes
2240          *  -----------------------------------------
2241          *     P     |    L  |    yes-v4 no-v6
2242          *  -----------------------------------------
2243          *     G     |    L  |    yes-v4 no-v6
2244          *  -----------------------------------------
2245          *     L     |    P  |    no
2246          *  -----------------------------------------
2247          *     P     |    P  |    yes
2248          *  -----------------------------------------
2249          *     G     |    P  |    no
2250          *   -----------------------------------------
2251          *     L     |    G  |    no
2252          *   -----------------------------------------
2253          *     P     |    G  |    no
2254          *    -----------------------------------------
2255          *     G     |    G  |    yes
2256          *    -----------------------------------------
2257          */
2258
2259         if (ifa->address.sa.sa_family != fam) {
2260                 /* forget mis-matched family */
2261                 return (NULL);
2262         }
2263         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264                 dest_is_global = 1;
2265         }
2266         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268         /* Ok the address may be ok */
2269 #ifdef INET6
2270         if (fam == AF_INET6) {
2271                 /* ok to use deprecated addresses? no lets not! */
2272                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274                         return (NULL);
2275                 }
2276                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2277                         if (dest_is_loop) {
2278                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279                                 return (NULL);
2280                         }
2281                 }
2282                 if (ifa->src_is_glob) {
2283                         if (dest_is_loop) {
2284                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285                                 return (NULL);
2286                         }
2287                 }
2288         }
2289 #endif
2290         /*
2291          * Now that we know what is what, implement or table this could in
2292          * theory be done slicker (it used to be), but this is
2293          * straightforward and easier to validate :-)
2294          */
2295         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298             dest_is_loop, dest_is_priv, dest_is_global);
2299
2300         if ((ifa->src_is_loop) && (dest_is_priv)) {
2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302                 return (NULL);
2303         }
2304         if ((ifa->src_is_glob) && (dest_is_priv)) {
2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306                 return (NULL);
2307         }
2308         if ((ifa->src_is_loop) && (dest_is_global)) {
2309                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310                 return (NULL);
2311         }
2312         if ((ifa->src_is_priv) && (dest_is_global)) {
2313                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314                 return (NULL);
2315         }
2316         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317         /* its a preferred address */
2318         return (ifa);
2319 }
2320
2321 static struct sctp_ifa *
2322 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323     uint8_t dest_is_loop,
2324     uint8_t dest_is_priv,
2325     sa_family_t fam)
2326 {
2327         uint8_t dest_is_global = 0;
2328
2329         /**
2330          * Here we determine if its a acceptable address. A acceptable
2331          * address means it is the same scope or higher scope but we can
2332          * allow for NAT which means its ok to have a global dest and a
2333          * private src.
2334          *
2335          * L = loopback, P = private, G = global
2336          * -----------------------------------------
2337          *  src    |  dest | result
2338          * -----------------------------------------
2339          *   L     |   L   |    yes
2340          *  -----------------------------------------
2341          *   P     |   L   |    yes-v4 no-v6
2342          *  -----------------------------------------
2343          *   G     |   L   |    yes
2344          * -----------------------------------------
2345          *   L     |   P   |    no
2346          * -----------------------------------------
2347          *   P     |   P   |    yes
2348          * -----------------------------------------
2349          *   G     |   P   |    yes - May not work
2350          * -----------------------------------------
2351          *   L     |   G   |    no
2352          * -----------------------------------------
2353          *   P     |   G   |    yes - May not work
2354          * -----------------------------------------
2355          *   G     |   G   |    yes
2356          * -----------------------------------------
2357          */
2358
2359         if (ifa->address.sa.sa_family != fam) {
2360                 /* forget non matching family */
2361                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362                     ifa->address.sa.sa_family, fam);
2363                 return (NULL);
2364         }
2365         /* Ok the address may be ok */
2366         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368             dest_is_loop, dest_is_priv);
2369         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370                 dest_is_global = 1;
2371         }
2372 #ifdef INET6
2373         if (fam == AF_INET6) {
2374                 /* ok to use deprecated addresses? */
2375                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376                         return (NULL);
2377                 }
2378                 if (ifa->src_is_priv) {
2379                         /* Special case, linklocal to loop */
2380                         if (dest_is_loop)
2381                                 return (NULL);
2382                 }
2383         }
2384 #endif
2385         /*
2386          * Now that we know what is what, implement our table. This could in
2387          * theory be done slicker (it used to be), but this is
2388          * straightforward and easier to validate :-)
2389          */
2390         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391             ifa->src_is_loop,
2392             dest_is_priv);
2393         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394                 return (NULL);
2395         }
2396         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397             ifa->src_is_loop,
2398             dest_is_global);
2399         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400                 return (NULL);
2401         }
2402         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403         /* its an acceptable address */
2404         return (ifa);
2405 }
2406
2407 int
2408 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409 {
2410         struct sctp_laddr *laddr;
2411
2412         if (stcb == NULL) {
2413                 /* There are no restrictions, no TCB :-) */
2414                 return (0);
2415         }
2416         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417                 if (laddr->ifa == NULL) {
2418                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419                             __func__);
2420                         continue;
2421                 }
2422                 if (laddr->ifa == ifa) {
2423                         /* Yes it is on the list */
2424                         return (1);
2425                 }
2426         }
2427         return (0);
2428 }
2429
2430
2431 int
2432 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433 {
2434         struct sctp_laddr *laddr;
2435
2436         if (ifa == NULL)
2437                 return (0);
2438         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439                 if (laddr->ifa == NULL) {
2440                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441                             __func__);
2442                         continue;
2443                 }
2444                 if ((laddr->ifa == ifa) && laddr->action == 0)
2445                         /* same pointer */
2446                         return (1);
2447         }
2448         return (0);
2449 }
2450
2451
2452
2453 static struct sctp_ifa *
2454 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455     sctp_route_t *ro,
2456     uint32_t vrf_id,
2457     int non_asoc_addr_ok,
2458     uint8_t dest_is_priv,
2459     uint8_t dest_is_loop,
2460     sa_family_t fam)
2461 {
2462         struct sctp_laddr *laddr, *starting_point;
2463         void *ifn;
2464         int resettotop = 0;
2465         struct sctp_ifn *sctp_ifn;
2466         struct sctp_ifa *sctp_ifa, *sifa;
2467         struct sctp_vrf *vrf;
2468         uint32_t ifn_index;
2469
2470         vrf = sctp_find_vrf(vrf_id);
2471         if (vrf == NULL)
2472                 return (NULL);
2473
2474         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477         /*
2478          * first question, is the ifn we will emit on in our list, if so, we
2479          * want such an address. Note that we first looked for a preferred
2480          * address.
2481          */
2482         if (sctp_ifn) {
2483                 /* is a preferred one on the interface we route out? */
2484                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485 #ifdef INET
2486                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2489                                 continue;
2490                         }
2491 #endif
2492 #ifdef INET6
2493                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496                                 continue;
2497                         }
2498 #endif
2499                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500                             (non_asoc_addr_ok == 0))
2501                                 continue;
2502                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503                             dest_is_loop,
2504                             dest_is_priv, fam);
2505                         if (sifa == NULL)
2506                                 continue;
2507                         if (sctp_is_addr_in_ep(inp, sifa)) {
2508                                 atomic_add_int(&sifa->refcount, 1);
2509                                 return (sifa);
2510                         }
2511                 }
2512         }
2513         /*
2514          * ok, now we now need to find one on the list of the addresses. We
2515          * can't get one on the emitting interface so let's find first a
2516          * preferred one. If not that an acceptable one otherwise... we
2517          * return NULL.
2518          */
2519         starting_point = inp->next_addr_touse;
2520 once_again:
2521         if (inp->next_addr_touse == NULL) {
2522                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523                 resettotop = 1;
2524         }
2525         for (laddr = inp->next_addr_touse; laddr;
2526             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527                 if (laddr->ifa == NULL) {
2528                         /* address has been removed */
2529                         continue;
2530                 }
2531                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532                         /* address is being deleted */
2533                         continue;
2534                 }
2535                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536                     dest_is_priv, fam);
2537                 if (sifa == NULL)
2538                         continue;
2539                 atomic_add_int(&sifa->refcount, 1);
2540                 return (sifa);
2541         }
2542         if (resettotop == 0) {
2543                 inp->next_addr_touse = NULL;
2544                 goto once_again;
2545         }
2546         inp->next_addr_touse = starting_point;
2547         resettotop = 0;
2548 once_again_too:
2549         if (inp->next_addr_touse == NULL) {
2550                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2551                 resettotop = 1;
2552         }
2553         /* ok, what about an acceptable address in the inp */
2554         for (laddr = inp->next_addr_touse; laddr;
2555             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2556                 if (laddr->ifa == NULL) {
2557                         /* address has been removed */
2558                         continue;
2559                 }
2560                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2561                         /* address is being deleted */
2562                         continue;
2563                 }
2564                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2565                     dest_is_priv, fam);
2566                 if (sifa == NULL)
2567                         continue;
2568                 atomic_add_int(&sifa->refcount, 1);
2569                 return (sifa);
2570         }
2571         if (resettotop == 0) {
2572                 inp->next_addr_touse = NULL;
2573                 goto once_again_too;
2574         }
2575         /*
2576          * no address bound can be a source for the destination we are in
2577          * trouble
2578          */
2579         return (NULL);
2580 }
2581
2582
2583
2584 static struct sctp_ifa *
2585 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2586     struct sctp_tcb *stcb,
2587     sctp_route_t *ro,
2588     uint32_t vrf_id,
2589     uint8_t dest_is_priv,
2590     uint8_t dest_is_loop,
2591     int non_asoc_addr_ok,
2592     sa_family_t fam)
2593 {
2594         struct sctp_laddr *laddr, *starting_point;
2595         void *ifn;
2596         struct sctp_ifn *sctp_ifn;
2597         struct sctp_ifa *sctp_ifa, *sifa;
2598         uint8_t start_at_beginning = 0;
2599         struct sctp_vrf *vrf;
2600         uint32_t ifn_index;
2601
2602         /*
2603          * first question, is the ifn we will emit on in our list, if so, we
2604          * want that one.
2605          */
2606         vrf = sctp_find_vrf(vrf_id);
2607         if (vrf == NULL)
2608                 return (NULL);
2609
2610         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2611         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2612         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2613
2614         /*
2615          * first question, is the ifn we will emit on in our list?  If so,
2616          * we want that one. First we look for a preferred. Second, we go
2617          * for an acceptable.
2618          */
2619         if (sctp_ifn) {
2620                 /* first try for a preferred address on the ep */
2621                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2622 #ifdef INET
2623                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2624                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2625                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2626                                 continue;
2627                         }
2628 #endif
2629 #ifdef INET6
2630                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2631                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2632                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2633                                 continue;
2634                         }
2635 #endif
2636                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2637                                 continue;
2638                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2639                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2640                                 if (sifa == NULL)
2641                                         continue;
2642                                 if (((non_asoc_addr_ok == 0) &&
2643                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2644                                     (non_asoc_addr_ok &&
2645                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2646                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2647                                         /* on the no-no list */
2648                                         continue;
2649                                 }
2650                                 atomic_add_int(&sifa->refcount, 1);
2651                                 return (sifa);
2652                         }
2653                 }
2654                 /* next try for an acceptable address on the ep */
2655                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2656 #ifdef INET
2657                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2658                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2659                             &sctp_ifa->address.sin.sin_addr) != 0)) {
2660                                 continue;
2661                         }
2662 #endif
2663 #ifdef INET6
2664                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2665                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2666                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2667                                 continue;
2668                         }
2669 #endif
2670                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2671                                 continue;
2672                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2673                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2674                                 if (sifa == NULL)
2675                                         continue;
2676                                 if (((non_asoc_addr_ok == 0) &&
2677                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2678                                     (non_asoc_addr_ok &&
2679                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2680                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2681                                         /* on the no-no list */
2682                                         continue;
2683                                 }
2684                                 atomic_add_int(&sifa->refcount, 1);
2685                                 return (sifa);
2686                         }
2687                 }
2688
2689         }
2690         /*
2691          * if we can't find one like that then we must look at all addresses
2692          * bound to pick one at first preferable then secondly acceptable.
2693          */
2694         starting_point = stcb->asoc.last_used_address;
2695 sctp_from_the_top:
2696         if (stcb->asoc.last_used_address == NULL) {
2697                 start_at_beginning = 1;
2698                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2699         }
2700         /* search beginning with the last used address */
2701         for (laddr = stcb->asoc.last_used_address; laddr;
2702             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2703                 if (laddr->ifa == NULL) {
2704                         /* address has been removed */
2705                         continue;
2706                 }
2707                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2708                         /* address is being deleted */
2709                         continue;
2710                 }
2711                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2712                 if (sifa == NULL)
2713                         continue;
2714                 if (((non_asoc_addr_ok == 0) &&
2715                     (sctp_is_addr_restricted(stcb, sifa))) ||
2716                     (non_asoc_addr_ok &&
2717                     (sctp_is_addr_restricted(stcb, sifa)) &&
2718                     (!sctp_is_addr_pending(stcb, sifa)))) {
2719                         /* on the no-no list */
2720                         continue;
2721                 }
2722                 stcb->asoc.last_used_address = laddr;
2723                 atomic_add_int(&sifa->refcount, 1);
2724                 return (sifa);
2725         }
2726         if (start_at_beginning == 0) {
2727                 stcb->asoc.last_used_address = NULL;
2728                 goto sctp_from_the_top;
2729         }
2730         /* now try for any higher scope than the destination */
2731         stcb->asoc.last_used_address = starting_point;
2732         start_at_beginning = 0;
2733 sctp_from_the_top2:
2734         if (stcb->asoc.last_used_address == NULL) {
2735                 start_at_beginning = 1;
2736                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2737         }
2738         /* search beginning with the last used address */
2739         for (laddr = stcb->asoc.last_used_address; laddr;
2740             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2741                 if (laddr->ifa == NULL) {
2742                         /* address has been removed */
2743                         continue;
2744                 }
2745                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2746                         /* address is being deleted */
2747                         continue;
2748                 }
2749                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2750                     dest_is_priv, fam);
2751                 if (sifa == NULL)
2752                         continue;
2753                 if (((non_asoc_addr_ok == 0) &&
2754                     (sctp_is_addr_restricted(stcb, sifa))) ||
2755                     (non_asoc_addr_ok &&
2756                     (sctp_is_addr_restricted(stcb, sifa)) &&
2757                     (!sctp_is_addr_pending(stcb, sifa)))) {
2758                         /* on the no-no list */
2759                         continue;
2760                 }
2761                 stcb->asoc.last_used_address = laddr;
2762                 atomic_add_int(&sifa->refcount, 1);
2763                 return (sifa);
2764         }
2765         if (start_at_beginning == 0) {
2766                 stcb->asoc.last_used_address = NULL;
2767                 goto sctp_from_the_top2;
2768         }
2769         return (NULL);
2770 }
2771
2772 static struct sctp_ifa *
2773 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2774     struct sctp_inpcb *inp,
2775     struct sctp_tcb *stcb,
2776     int non_asoc_addr_ok,
2777     uint8_t dest_is_loop,
2778     uint8_t dest_is_priv,
2779     int addr_wanted,
2780     sa_family_t fam,
2781     sctp_route_t *ro
2782 )
2783 {
2784         struct sctp_ifa *ifa, *sifa;
2785         int num_eligible_addr = 0;
2786 #ifdef INET6
2787         struct sockaddr_in6 sin6, lsa6;
2788
2789         if (fam == AF_INET6) {
2790                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791                 (void)sa6_recoverscope(&sin6);
2792         }
2793 #endif                          /* INET6 */
2794         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795 #ifdef INET
2796                 if ((ifa->address.sa.sa_family == AF_INET) &&
2797                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798                     &ifa->address.sin.sin_addr) != 0)) {
2799                         continue;
2800                 }
2801 #endif
2802 #ifdef INET6
2803                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2804                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805                     &ifa->address.sin6.sin6_addr) != 0)) {
2806                         continue;
2807                 }
2808 #endif
2809                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810                     (non_asoc_addr_ok == 0))
2811                         continue;
2812                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813                     dest_is_priv, fam);
2814                 if (sifa == NULL)
2815                         continue;
2816 #ifdef INET6
2817                 if (fam == AF_INET6 &&
2818                     dest_is_loop &&
2819                     sifa->src_is_loop && sifa->src_is_priv) {
2820                         /*
2821                          * don't allow fe80::1 to be a src on loop ::1, we
2822                          * don't list it to the peer so we will get an
2823                          * abort.
2824                          */
2825                         continue;
2826                 }
2827                 if (fam == AF_INET6 &&
2828                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830                         /*
2831                          * link-local <-> link-local must belong to the same
2832                          * scope.
2833                          */
2834                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835                         (void)sa6_recoverscope(&lsa6);
2836                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837                                 continue;
2838                         }
2839                 }
2840 #endif                          /* INET6 */
2841
2842                 /*
2843                  * Check if the IPv6 address matches to next-hop. In the
2844                  * mobile case, old IPv6 address may be not deleted from the
2845                  * interface. Then, the interface has previous and new
2846                  * addresses.  We should use one corresponding to the
2847                  * next-hop.  (by micchie)
2848                  */
2849 #ifdef INET6
2850                 if (stcb && fam == AF_INET6 &&
2851                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853                             == 0) {
2854                                 continue;
2855                         }
2856                 }
2857 #endif
2858 #ifdef INET
2859                 /* Avoid topologically incorrect IPv4 address */
2860                 if (stcb && fam == AF_INET &&
2861                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863                                 continue;
2864                         }
2865                 }
2866 #endif
2867                 if (stcb) {
2868                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869                                 continue;
2870                         }
2871                         if (((non_asoc_addr_ok == 0) &&
2872                             (sctp_is_addr_restricted(stcb, sifa))) ||
2873                             (non_asoc_addr_ok &&
2874                             (sctp_is_addr_restricted(stcb, sifa)) &&
2875                             (!sctp_is_addr_pending(stcb, sifa)))) {
2876                                 /*
2877                                  * It is restricted for some reason..
2878                                  * probably not yet added.
2879                                  */
2880                                 continue;
2881                         }
2882                 }
2883                 if (num_eligible_addr >= addr_wanted) {
2884                         return (sifa);
2885                 }
2886                 num_eligible_addr++;
2887         }
2888         return (NULL);
2889 }
2890
2891
2892 static int
2893 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894     struct sctp_inpcb *inp,
2895     struct sctp_tcb *stcb,
2896     int non_asoc_addr_ok,
2897     uint8_t dest_is_loop,
2898     uint8_t dest_is_priv,
2899     sa_family_t fam)
2900 {
2901         struct sctp_ifa *ifa, *sifa;
2902         int num_eligible_addr = 0;
2903
2904         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905 #ifdef INET
2906                 if ((ifa->address.sa.sa_family == AF_INET) &&
2907                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908                     &ifa->address.sin.sin_addr) != 0)) {
2909                         continue;
2910                 }
2911 #endif
2912 #ifdef INET6
2913                 if ((ifa->address.sa.sa_family == AF_INET6) &&
2914                     (stcb != NULL) &&
2915                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916                     &ifa->address.sin6.sin6_addr) != 0)) {
2917                         continue;
2918                 }
2919 #endif
2920                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921                     (non_asoc_addr_ok == 0)) {
2922                         continue;
2923                 }
2924                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925                     dest_is_priv, fam);
2926                 if (sifa == NULL) {
2927                         continue;
2928                 }
2929                 if (stcb) {
2930                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931                                 continue;
2932                         }
2933                         if (((non_asoc_addr_ok == 0) &&
2934                             (sctp_is_addr_restricted(stcb, sifa))) ||
2935                             (non_asoc_addr_ok &&
2936                             (sctp_is_addr_restricted(stcb, sifa)) &&
2937                             (!sctp_is_addr_pending(stcb, sifa)))) {
2938                                 /*
2939                                  * It is restricted for some reason..
2940                                  * probably not yet added.
2941                                  */
2942                                 continue;
2943                         }
2944                 }
2945                 num_eligible_addr++;
2946         }
2947         return (num_eligible_addr);
2948 }
2949
2950 static struct sctp_ifa *
2951 sctp_choose_boundall(struct sctp_inpcb *inp,
2952     struct sctp_tcb *stcb,
2953     struct sctp_nets *net,
2954     sctp_route_t *ro,
2955     uint32_t vrf_id,
2956     uint8_t dest_is_priv,
2957     uint8_t dest_is_loop,
2958     int non_asoc_addr_ok,
2959     sa_family_t fam)
2960 {
2961         int cur_addr_num = 0, num_preferred = 0;
2962         void *ifn;
2963         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964         struct sctp_ifa *sctp_ifa, *sifa;
2965         uint32_t ifn_index;
2966         struct sctp_vrf *vrf;
2967 #ifdef INET
2968         int retried = 0;
2969 #endif
2970
2971         /*-
2972          * For boundall we can use any address in the association.
2973          * If non_asoc_addr_ok is set we can use any address (at least in
2974          * theory). So we look for preferred addresses first. If we find one,
2975          * we use it. Otherwise we next try to get an address on the
2976          * interface, which we should be able to do (unless non_asoc_addr_ok
2977          * is false and we are routed out that way). In these cases where we
2978          * can't use the address of the interface we go through all the
2979          * ifn's looking for an address we can use and fill that in. Punting
2980          * means we send back address 0, which will probably cause problems
2981          * actually since then IP will fill in the address of the route ifn,
2982          * which means we probably already rejected it.. i.e. here comes an
2983          * abort :-<.
2984          */
2985         vrf = sctp_find_vrf(vrf_id);
2986         if (vrf == NULL)
2987                 return (NULL);
2988
2989         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2990         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2991         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2992         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2993         if (sctp_ifn == NULL) {
2994                 /* ?? We don't have this guy ?? */
2995                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2996                 goto bound_all_plan_b;
2997         }
2998         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2999             ifn_index, sctp_ifn->ifn_name);
3000
3001         if (net) {
3002                 cur_addr_num = net->indx_of_eligible_next_to_use;
3003         }
3004         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3005             inp, stcb,
3006             non_asoc_addr_ok,
3007             dest_is_loop,
3008             dest_is_priv, fam);
3009         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3010             num_preferred, sctp_ifn->ifn_name);
3011         if (num_preferred == 0) {
3012                 /*
3013                  * no eligible addresses, we must use some other interface
3014                  * address if we can find one.
3015                  */
3016                 goto bound_all_plan_b;
3017         }
3018         /*
3019          * Ok we have num_eligible_addr set with how many we can use, this
3020          * may vary from call to call due to addresses being deprecated
3021          * etc..
3022          */
3023         if (cur_addr_num >= num_preferred) {
3024                 cur_addr_num = 0;
3025         }
3026         /*
3027          * select the nth address from the list (where cur_addr_num is the
3028          * nth) and 0 is the first one, 1 is the second one etc...
3029          */
3030         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3031
3032         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3033             dest_is_priv, cur_addr_num, fam, ro);
3034
3035         /* if sctp_ifa is NULL something changed??, fall to plan b. */
3036         if (sctp_ifa) {
3037                 atomic_add_int(&sctp_ifa->refcount, 1);
3038                 if (net) {
3039                         /* save off where the next one we will want */
3040                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3041                 }
3042                 return (sctp_ifa);
3043         }
3044         /*
3045          * plan_b: Look at all interfaces and find a preferred address. If
3046          * no preferred fall through to plan_c.
3047          */
3048 bound_all_plan_b:
3049         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3050         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3051                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3052                     sctp_ifn->ifn_name);
3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054                         /* wrong base scope */
3055                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3056                         continue;
3057                 }
3058                 if ((sctp_ifn == looked_at) && looked_at) {
3059                         /* already looked at this guy */
3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3061                         continue;
3062                 }
3063                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3064                     dest_is_loop, dest_is_priv, fam);
3065                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3066                     "Found ifn:%p %d preferred source addresses\n",
3067                     ifn, num_preferred);
3068                 if (num_preferred == 0) {
3069                         /* None on this interface. */
3070                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3071                         continue;
3072                 }
3073                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3074                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3075                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3076
3077                 /*
3078                  * Ok we have num_eligible_addr set with how many we can
3079                  * use, this may vary from call to call due to addresses
3080                  * being deprecated etc..
3081                  */
3082                 if (cur_addr_num >= num_preferred) {
3083                         cur_addr_num = 0;
3084                 }
3085                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3086                     dest_is_priv, cur_addr_num, fam, ro);
3087                 if (sifa == NULL)
3088                         continue;
3089                 if (net) {
3090                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3091                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3092                             cur_addr_num);
3093                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3094                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3096                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3097                 }
3098                 atomic_add_int(&sifa->refcount, 1);
3099                 return (sifa);
3100         }
3101 #ifdef INET
3102 again_with_private_addresses_allowed:
3103 #endif
3104         /* plan_c: do we have an acceptable address on the emit interface */
3105         sifa = NULL;
3106         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3107         if (emit_ifn == NULL) {
3108                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3109                 goto plan_d;
3110         }
3111         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3113 #ifdef INET
3114                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3115                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3116                     &sctp_ifa->address.sin.sin_addr) != 0)) {
3117                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3118                         continue;
3119                 }
3120 #endif
3121 #ifdef INET6
3122                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3123                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3124                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3125                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3126                         continue;
3127                 }
3128 #endif
3129                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3130                     (non_asoc_addr_ok == 0)) {
3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3132                         continue;
3133                 }
3134                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3135                     dest_is_priv, fam);
3136                 if (sifa == NULL) {
3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3138                         continue;
3139                 }
3140                 if (stcb) {
3141                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3142                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3143                                 sifa = NULL;
3144                                 continue;
3145                         }
3146                         if (((non_asoc_addr_ok == 0) &&
3147                             (sctp_is_addr_restricted(stcb, sifa))) ||
3148                             (non_asoc_addr_ok &&
3149                             (sctp_is_addr_restricted(stcb, sifa)) &&
3150                             (!sctp_is_addr_pending(stcb, sifa)))) {
3151                                 /*
3152                                  * It is restricted for some reason..
3153                                  * probably not yet added.
3154                                  */
3155                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3156                                 sifa = NULL;
3157                                 continue;
3158                         }
3159                 }
3160                 atomic_add_int(&sifa->refcount, 1);
3161                 goto out;
3162         }
3163 plan_d:
3164         /*
3165          * plan_d: We are in trouble. No preferred address on the emit
3166          * interface. And not even a preferred address on all interfaces. Go
3167          * out and see if we can find an acceptable address somewhere
3168          * amongst all interfaces.
3169          */
3170         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3171         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3172                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3173                         /* wrong base scope */
3174                         continue;
3175                 }
3176                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3177 #ifdef INET
3178                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3179                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3180                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3181                                 continue;
3182                         }
3183 #endif
3184 #ifdef INET6
3185                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3186                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3187                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3188                                 continue;
3189                         }
3190 #endif
3191                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3192                             (non_asoc_addr_ok == 0))
3193                                 continue;
3194                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3195                             dest_is_loop,
3196                             dest_is_priv, fam);
3197                         if (sifa == NULL)
3198                                 continue;
3199                         if (stcb) {
3200                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3201                                         sifa = NULL;
3202                                         continue;
3203                                 }
3204                                 if (((non_asoc_addr_ok == 0) &&
3205                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3206                                     (non_asoc_addr_ok &&
3207                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3208                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3209                                         /*
3210                                          * It is restricted for some
3211                                          * reason.. probably not yet added.
3212                                          */
3213                                         sifa = NULL;
3214                                         continue;
3215                                 }
3216                         }
3217                         goto out;
3218                 }
3219         }
3220 #ifdef INET
3221         if (stcb) {
3222                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3223                         stcb->asoc.scope.ipv4_local_scope = 1;
3224                         retried = 1;
3225                         goto again_with_private_addresses_allowed;
3226                 } else if (retried == 1) {
3227                         stcb->asoc.scope.ipv4_local_scope = 0;
3228                 }
3229         }
3230 #endif
3231 out:
3232 #ifdef INET
3233         if (sifa) {
3234                 if (retried == 1) {
3235                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3236                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3237                                         /* wrong base scope */
3238                                         continue;
3239                                 }
3240                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3241                                         struct sctp_ifa *tmp_sifa;
3242
3243 #ifdef INET
3244                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3245                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3246                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
3247                                                 continue;
3248                                         }
3249 #endif
3250 #ifdef INET6
3251                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3252                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3253                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3254                                                 continue;
3255                                         }
3256 #endif
3257                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3258                                             (non_asoc_addr_ok == 0))
3259                                                 continue;
3260                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3261                                             dest_is_loop,
3262                                             dest_is_priv, fam);
3263                                         if (tmp_sifa == NULL) {
3264                                                 continue;
3265                                         }
3266                                         if (tmp_sifa == sifa) {
3267                                                 continue;
3268                                         }
3269                                         if (stcb) {
3270                                                 if (sctp_is_address_in_scope(tmp_sifa,
3271                                                     &stcb->asoc.scope, 0) == 0) {
3272                                                         continue;
3273                                                 }
3274                                                 if (((non_asoc_addr_ok == 0) &&
3275                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3276                                                     (non_asoc_addr_ok &&
3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3278                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3279                                                         /*
3280                                                          * It is restricted
3281                                                          * for some reason..
3282                                                          * probably not yet
3283                                                          * added.
3284                                                          */
3285                                                         continue;
3286                                                 }
3287                                         }
3288                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3289                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3290                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3291                                         }
3292                                 }
3293                         }
3294                 }
3295                 atomic_add_int(&sifa->refcount, 1);
3296         }
3297 #endif
3298         return (sifa);
3299 }
3300
3301
3302
3303 /* tcb may be NULL */
3304 struct sctp_ifa *
3305 sctp_source_address_selection(struct sctp_inpcb *inp,
3306     struct sctp_tcb *stcb,
3307     sctp_route_t *ro,
3308     struct sctp_nets *net,
3309     int non_asoc_addr_ok, uint32_t vrf_id)
3310 {
3311         struct sctp_ifa *answer;
3312         uint8_t dest_is_priv, dest_is_loop;
3313         sa_family_t fam;
3314 #ifdef INET
3315         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3316 #endif
3317 #ifdef INET6
3318         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3319 #endif
3320
3321         /**
3322          * Rules:
3323          * - Find the route if needed, cache if I can.
3324          * - Look at interface address in route, Is it in the bound list. If so we
3325          *   have the best source.
3326          * - If not we must rotate amongst the addresses.
3327          *
3328          * Cavets and issues
3329          *
3330          * Do we need to pay attention to scope. We can have a private address
3331          * or a global address we are sourcing or sending to. So if we draw
3332          * it out
3333          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3334          * For V4
3335          * ------------------------------------------
3336          *      source     *      dest  *  result
3337          * -----------------------------------------
3338          * <a>  Private    *    Global  *  NAT
3339          * -----------------------------------------
3340          * <b>  Private    *    Private *  No problem
3341          * -----------------------------------------
3342          * <c>  Global     *    Private *  Huh, How will this work?
3343          * -----------------------------------------
3344          * <d>  Global     *    Global  *  No Problem
3345          *------------------------------------------
3346          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3347          * For V6
3348          *------------------------------------------
3349          *      source     *      dest  *  result
3350          * -----------------------------------------
3351          * <a>  Linklocal  *    Global  *
3352          * -----------------------------------------
3353          * <b>  Linklocal  * Linklocal  *  No problem
3354          * -----------------------------------------
3355          * <c>  Global     * Linklocal  *  Huh, How will this work?
3356          * -----------------------------------------
3357          * <d>  Global     *    Global  *  No Problem
3358          *------------------------------------------
3359          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3360          *
3361          * And then we add to that what happens if there are multiple addresses
3362          * assigned to an interface. Remember the ifa on a ifn is a linked
3363          * list of addresses. So one interface can have more than one IP
3364          * address. What happens if we have both a private and a global
3365          * address? Do we then use context of destination to sort out which
3366          * one is best? And what about NAT's sending P->G may get you a NAT
3367          * translation, or should you select the G thats on the interface in
3368          * preference.
3369          *
3370          * Decisions:
3371          *
3372          * - count the number of addresses on the interface.
3373          * - if it is one, no problem except case <c>.
3374          *   For <a> we will assume a NAT out there.
3375          * - if there are more than one, then we need to worry about scope P
3376          *   or G. We should prefer G -> G and P -> P if possible.
3377          *   Then as a secondary fall back to mixed types G->P being a last
3378          *   ditch one.
3379          * - The above all works for bound all, but bound specific we need to
3380          *   use the same concept but instead only consider the bound
3381          *   addresses. If the bound set is NOT assigned to the interface then
3382          *   we must use rotation amongst the bound addresses..
3383          */
3384         if (ro->ro_rt == NULL) {
3385                 /*
3386                  * Need a route to cache.
3387                  */
3388                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3389         }
3390         if (ro->ro_rt == NULL) {
3391                 return (NULL);
3392         }
3393         fam = ro->ro_dst.sa_family;
3394         dest_is_priv = dest_is_loop = 0;
3395         /* Setup our scopes for the destination */
3396         switch (fam) {
3397 #ifdef INET
3398         case AF_INET:
3399                 /* Scope based on outbound address */
3400                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3401                         dest_is_loop = 1;
3402                         if (net != NULL) {
3403                                 /* mark it as local */
3404                                 net->addr_is_local = 1;
3405                         }
3406                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3407                         dest_is_priv = 1;
3408                 }
3409                 break;
3410 #endif
3411 #ifdef INET6
3412         case AF_INET6:
3413                 /* Scope based on outbound address */
3414                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3415                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3416                         /*
3417                          * If the address is a loopback address, which
3418                          * consists of "::1" OR "fe80::1%lo0", we are
3419                          * loopback scope. But we don't use dest_is_priv
3420                          * (link local addresses).
3421                          */
3422                         dest_is_loop = 1;
3423                         if (net != NULL) {
3424                                 /* mark it as local */
3425                                 net->addr_is_local = 1;
3426                         }
3427                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3428                         dest_is_priv = 1;
3429                 }
3430                 break;
3431 #endif
3432         }
3433         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3434         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3435         SCTP_IPI_ADDR_RLOCK();
3436         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3437                 /*
3438                  * Bound all case
3439                  */
3440                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3441                     dest_is_priv, dest_is_loop,
3442                     non_asoc_addr_ok, fam);
3443                 SCTP_IPI_ADDR_RUNLOCK();
3444                 return (answer);
3445         }
3446         /*
3447          * Subset bound case
3448          */
3449         if (stcb) {
3450                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3451                     vrf_id, dest_is_priv,
3452                     dest_is_loop,
3453                     non_asoc_addr_ok, fam);
3454         } else {
3455                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3456                     non_asoc_addr_ok,
3457                     dest_is_priv,
3458                     dest_is_loop, fam);
3459         }
3460         SCTP_IPI_ADDR_RUNLOCK();
3461         return (answer);
3462 }
3463
3464 static int
3465 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3466 {
3467         struct cmsghdr cmh;
3468         int tlen, at, found;
3469         struct sctp_sndinfo sndinfo;
3470         struct sctp_prinfo prinfo;
3471         struct sctp_authinfo authinfo;
3472
3473         tlen = SCTP_BUF_LEN(control);
3474         at = 0;
3475         found = 0;
3476         /*
3477          * Independent of how many mbufs, find the c_type inside the control
3478          * structure and copy out the data.
3479          */
3480         while (at < tlen) {
3481                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3482                         /* There is not enough room for one more. */
3483                         return (found);
3484                 }
3485                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3486                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3487                         /* We dont't have a complete CMSG header. */
3488                         return (found);
3489                 }
3490                 if (((int)cmh.cmsg_len + at) > tlen) {
3491                         /* We don't have the complete CMSG. */
3492                         return (found);
3493                 }
3494                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3495                     ((c_type == cmh.cmsg_type) ||
3496                     ((c_type == SCTP_SNDRCV) &&
3497                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3498                     (cmh.cmsg_type == SCTP_PRINFO) ||
3499                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3500                         if (c_type == cmh.cmsg_type) {
3501                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3502                                         return (found);
3503                                 }
3504                                 /* It is exactly what we want. Copy it out. */
3505                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3506                                 return (1);
3507                         } else {
3508                                 struct sctp_sndrcvinfo *sndrcvinfo;
3509
3510                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3511                                 if (found == 0) {
3512                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3513                                                 return (found);
3514                                         }
3515                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3516                                 }
3517                                 switch (cmh.cmsg_type) {
3518                                 case SCTP_SNDINFO:
3519                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3520                                                 return (found);
3521                                         }
3522                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3523                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3524                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3525                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3526                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3527                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3528                                         break;
3529                                 case SCTP_PRINFO:
3530                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3531                                                 return (found);
3532                                         }
3533                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3534                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3535                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3536                                         } else {
3537                                                 sndrcvinfo->sinfo_timetolive = 0;
3538                                         }
3539                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3540                                         break;
3541                                 case SCTP_AUTHINFO:
3542                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3543                                                 return (found);
3544                                         }
3545                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3546                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3547                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3548                                         break;
3549                                 default:
3550                                         return (found);
3551                                 }
3552                                 found = 1;
3553                         }
3554                 }
3555                 at += CMSG_ALIGN(cmh.cmsg_len);
3556         }
3557         return (found);
3558 }
3559
3560 static int
3561 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3562 {
3563         struct cmsghdr cmh;
3564         int tlen, at;
3565         struct sctp_initmsg initmsg;
3566 #ifdef INET
3567         struct sockaddr_in sin;
3568 #endif
3569 #ifdef INET6
3570         struct sockaddr_in6 sin6;
3571 #endif
3572
3573         tlen = SCTP_BUF_LEN(control);
3574         at = 0;
3575         while (at < tlen) {
3576                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3577                         /* There is not enough room for one more. */
3578                         *error = EINVAL;
3579                         return (1);
3580                 }
3581                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3582                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3583                         /* We dont't have a complete CMSG header. */
3584                         *error = EINVAL;
3585                         return (1);
3586                 }
3587                 if (((int)cmh.cmsg_len + at) > tlen) {
3588                         /* We don't have the complete CMSG. */
3589                         *error = EINVAL;
3590                         return (1);
3591                 }
3592                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3593                         switch (cmh.cmsg_type) {
3594                         case SCTP_INIT:
3595                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3596                                         *error = EINVAL;
3597                                         return (1);
3598                                 }
3599                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600                                 if (initmsg.sinit_max_attempts)
3601                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602                                 if (initmsg.sinit_num_ostreams)
3603                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604                                 if (initmsg.sinit_max_instreams)
3605                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606                                 if (initmsg.sinit_max_init_timeo)
3607                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609                                         struct sctp_stream_out *tmp_str;
3610                                         unsigned int i;
3611 #if defined(SCTP_DETAILED_STR_STATS)
3612                                         int j;
3613 #endif
3614
3615                                         /* Default is NOT correct */
3616                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618                                         SCTP_TCB_UNLOCK(stcb);
3619                                         SCTP_MALLOC(tmp_str,
3620                                             struct sctp_stream_out *,
3621                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622                                             SCTP_M_STRMO);
3623                                         SCTP_TCB_LOCK(stcb);
3624                                         if (tmp_str != NULL) {
3625                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626                                                 stcb->asoc.strmout = tmp_str;
3627                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628                                         } else {
3629                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630                                         }
3631                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3634                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
3635                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
3636 #if defined(SCTP_DETAILED_STR_STATS)
3637                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640                                                 }
3641 #else
3642                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644 #endif
3645                                                 stcb->asoc.strmout[i].sid = i;
3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649                                         }
3650                                 }
3651                                 break;
3652 #ifdef INET
3653                         case SCTP_DSTADDRV4:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3655                                         *error = EINVAL;
3656                                         return (1);
3657                                 }
3658                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3659                                 sin.sin_family = AF_INET;
3660                                 sin.sin_len = sizeof(struct sockaddr_in);
3661                                 sin.sin_port = stcb->rport;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666                                         *error = EINVAL;
3667                                         return (1);
3668                                 }
3669                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671                                         *error = ENOBUFS;
3672                                         return (1);
3673                                 }
3674                                 break;
3675 #endif
3676 #ifdef INET6
3677                         case SCTP_DSTADDRV6:
3678                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3679                                         *error = EINVAL;
3680                                         return (1);
3681                                 }
3682                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683                                 sin6.sin6_family = AF_INET6;
3684                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3685                                 sin6.sin6_port = stcb->rport;
3686                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689                                         *error = EINVAL;
3690                                         return (1);
3691                                 }
3692 #ifdef INET
3693                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694                                         in6_sin6_2_sin(&sin, &sin6);
3695                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698                                                 *error = EINVAL;
3699                                                 return (1);
3700                                         }
3701                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703                                                 *error = ENOBUFS;
3704                                                 return (1);
3705                                         }
3706                                 } else
3707 #endif
3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710                                         *error = ENOBUFS;
3711                                         return (1);
3712                                 }
3713                                 break;
3714 #endif
3715                         default:
3716                                 break;
3717                         }
3718                 }
3719                 at += CMSG_ALIGN(cmh.cmsg_len);
3720         }
3721         return (0);
3722 }
3723
3724 static struct sctp_tcb *
3725 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726     uint16_t port,
3727     struct mbuf *control,
3728     struct sctp_nets **net_p,
3729     int *error)
3730 {
3731         struct cmsghdr cmh;
3732         int tlen, at;
3733         struct sctp_tcb *stcb;
3734         struct sockaddr *addr;
3735 #ifdef INET
3736         struct sockaddr_in sin;
3737 #endif
3738 #ifdef INET6
3739         struct sockaddr_in6 sin6;
3740 #endif
3741
3742         tlen = SCTP_BUF_LEN(control);
3743         at = 0;
3744         while (at < tlen) {
3745                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3746                         /* There is not enough room for one more. */
3747                         *error = EINVAL;
3748                         return (NULL);
3749                 }
3750                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3751                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752                         /* We dont't have a complete CMSG header. */
3753                         *error = EINVAL;
3754                         return (NULL);
3755                 }
3756                 if (((int)cmh.cmsg_len + at) > tlen) {
3757                         /* We don't have the complete CMSG. */
3758                         *error = EINVAL;
3759                         return (NULL);
3760                 }
3761                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3762                         switch (cmh.cmsg_type) {
3763 #ifdef INET
3764                         case SCTP_DSTADDRV4:
3765                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3766                                         *error = EINVAL;
3767                                         return (NULL);
3768                                 }
3769                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3770                                 sin.sin_family = AF_INET;
3771                                 sin.sin_len = sizeof(struct sockaddr_in);
3772                                 sin.sin_port = port;
3773                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774                                 addr = (struct sockaddr *)&sin;
3775                                 break;
3776 #endif
3777 #ifdef INET6
3778                         case SCTP_DSTADDRV6:
3779                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3780                                         *error = EINVAL;
3781                                         return (NULL);
3782                                 }
3783                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784                                 sin6.sin6_family = AF_INET6;
3785                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3786                                 sin6.sin6_port = port;
3787                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788 #ifdef INET
3789                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790                                         in6_sin6_2_sin(&sin, &sin6);
3791                                         addr = (struct sockaddr *)&sin;
3792                                 } else
3793 #endif
3794                                         addr = (struct sockaddr *)&sin6;
3795                                 break;
3796 #endif
3797                         default:
3798                                 addr = NULL;
3799                                 break;
3800                         }
3801                         if (addr) {
3802                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803                                 if (stcb != NULL) {
3804                                         return (stcb);
3805                                 }
3806                         }
3807                 }
3808                 at += CMSG_ALIGN(cmh.cmsg_len);
3809         }
3810         return (NULL);
3811 }
3812
3813 static struct mbuf *
3814 sctp_add_cookie(struct mbuf *init, int init_offset,
3815     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816 {
3817         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818         struct sctp_state_cookie *stc;
3819         struct sctp_paramhdr *ph;
3820         uint8_t *foo;
3821         int sig_offset;
3822         uint16_t cookie_sz;
3823
3824         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825             sizeof(struct sctp_paramhdr)), 0,
3826             M_NOWAIT, 1, MT_DATA);
3827         if (mret == NULL) {
3828                 return (NULL);
3829         }
3830         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831         if (copy_init == NULL) {
3832                 sctp_m_freem(mret);
3833                 return (NULL);
3834         }
3835 #ifdef SCTP_MBUF_LOGGING
3836         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838         }
3839 #endif
3840         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841             M_NOWAIT);
3842         if (copy_initack == NULL) {
3843                 sctp_m_freem(mret);
3844                 sctp_m_freem(copy_init);
3845                 return (NULL);
3846         }
3847 #ifdef SCTP_MBUF_LOGGING
3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850         }
3851 #endif
3852         /* easy side we just drop it on the end */
3853         ph = mtod(mret, struct sctp_paramhdr *);
3854         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855             sizeof(struct sctp_paramhdr);
3856         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857             sizeof(struct sctp_paramhdr));
3858         ph->param_type = htons(SCTP_STATE_COOKIE);
3859         ph->param_length = 0;   /* fill in at the end */
3860         /* Fill in the stc cookie data */
3861         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862
3863         /* tack the INIT and then the INIT-ACK onto the chain */
3864         cookie_sz = 0;
3865         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866                 cookie_sz += SCTP_BUF_LEN(m_at);
3867                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3868                         SCTP_BUF_NEXT(m_at) = copy_init;
3869                         break;
3870                 }
3871         }
3872         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873                 cookie_sz += SCTP_BUF_LEN(m_at);
3874                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3875                         SCTP_BUF_NEXT(m_at) = copy_initack;
3876                         break;
3877                 }
3878         }
3879         for (m_at = copy_initack; 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                         break;
3883                 }
3884         }
3885         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886         if (sig == NULL) {
3887                 /* no space, so free the entire chain */
3888                 sctp_m_freem(mret);
3889                 return (NULL);
3890         }
3891         SCTP_BUF_LEN(sig) = 0;
3892         SCTP_BUF_NEXT(m_at) = sig;
3893         sig_offset = 0;
3894         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3895         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3896         *signature = foo;
3897         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3898         cookie_sz += SCTP_SIGNATURE_SIZE;
3899         ph->param_length = htons(cookie_sz);
3900         return (mret);
3901 }
3902
3903
3904 static uint8_t
3905 sctp_get_ect(struct sctp_tcb *stcb)
3906 {
3907         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3908                 return (SCTP_ECT0_BIT);
3909         } else {
3910                 return (0);
3911         }
3912 }
3913
3914 #if defined(INET) || defined(INET6)
3915 static void
3916 sctp_handle_no_route(struct sctp_tcb *stcb,
3917     struct sctp_nets *net,
3918     int so_locked)
3919 {
3920         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3921
3922         if (net) {
3923                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3924                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3925                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3926                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3927                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3928                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3929                                     stcb, 0,
3930                                     (void *)net,
3931                                     so_locked);
3932                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3933                                 net->dest_state &= ~SCTP_ADDR_PF;
3934                         }
3935                 }
3936                 if (stcb) {
3937                         if (net == stcb->asoc.primary_destination) {
3938                                 /* need a new primary */
3939                                 struct sctp_nets *alt;
3940
3941                                 alt = sctp_find_alternate_net(stcb, net, 0);
3942                                 if (alt != net) {
3943                                         if (stcb->asoc.alternate) {
3944                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3945                                         }
3946                                         stcb->asoc.alternate = alt;
3947                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3948                                         if (net->ro._s_addr) {
3949                                                 sctp_free_ifa(net->ro._s_addr);
3950                                                 net->ro._s_addr = NULL;
3951                                         }
3952                                         net->src_addr_selected = 0;
3953                                 }
3954                         }
3955                 }
3956         }
3957 }
3958 #endif
3959
3960 static int
3961 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3962     struct sctp_tcb *stcb,      /* may be NULL */
3963     struct sctp_nets *net,
3964     struct sockaddr *to,
3965     struct mbuf *m,
3966     uint32_t auth_offset,
3967     struct sctp_auth_chunk *auth,
3968     uint16_t auth_keyid,
3969     int nofragment_flag,
3970     int ecn_ok,
3971     int out_of_asoc_ok,
3972     uint16_t src_port,
3973     uint16_t dest_port,
3974     uint32_t v_tag,
3975     uint16_t port,
3976     union sctp_sockstore *over_addr,
3977     uint8_t mflowtype, uint32_t mflowid,
3978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3979     int so_locked SCTP_UNUSED
3980 #else
3981     int so_locked
3982 #endif
3983 )
3984 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3985 {
3986         /**
3987          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3988          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3989          * - fill in the HMAC digest of any AUTH chunk in the packet.
3990          * - calculate and fill in the SCTP checksum.
3991          * - prepend an IP address header.
3992          * - if boundall use INADDR_ANY.
3993          * - if boundspecific do source address selection.
3994          * - set fragmentation option for ipV4.
3995          * - On return from IP output, check/adjust mtu size of output
3996          *   interface and smallest_mtu size as well.
3997          */
3998         /* Will need ifdefs around this */
3999         struct mbuf *newm;
4000         struct sctphdr *sctphdr;
4001         int packet_length;
4002         int ret;
4003 #if defined(INET) || defined(INET6)
4004         uint32_t vrf_id;
4005 #endif
4006 #if defined(INET) || defined(INET6)
4007         struct mbuf *o_pak;
4008         sctp_route_t *ro = NULL;
4009         struct udphdr *udp = NULL;
4010 #endif
4011         uint8_t tos_value;
4012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013         struct socket *so = NULL;
4014 #endif
4015
4016         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018                 sctp_m_freem(m);
4019                 return (EFAULT);
4020         }
4021 #if defined(INET) || defined(INET6)
4022         if (stcb) {
4023                 vrf_id = stcb->asoc.vrf_id;
4024         } else {
4025                 vrf_id = inp->def_vrf_id;
4026         }
4027 #endif
4028         /* fill in the HMAC digest for any AUTH chunk in the packet */
4029         if ((auth != NULL) && (stcb != NULL)) {
4030                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031         }
4032         if (net) {
4033                 tos_value = net->dscp;
4034         } else if (stcb) {
4035                 tos_value = stcb->asoc.default_dscp;
4036         } else {
4037                 tos_value = inp->sctp_ep.default_dscp;
4038         }
4039
4040         switch (to->sa_family) {
4041 #ifdef INET
4042         case AF_INET:
4043                 {
4044                         struct ip *ip = NULL;
4045                         sctp_route_t iproute;
4046                         int len;
4047
4048                         len = SCTP_MIN_V4_OVERHEAD;
4049                         if (port) {
4050                                 len += sizeof(struct udphdr);
4051                         }
4052                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053                         if (newm == NULL) {
4054                                 sctp_m_freem(m);
4055                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056                                 return (ENOMEM);
4057                         }
4058                         SCTP_ALIGN_TO_END(newm, len);
4059                         SCTP_BUF_LEN(newm) = len;
4060                         SCTP_BUF_NEXT(newm) = m;
4061                         m = newm;
4062                         if (net != NULL) {
4063                                 m->m_pkthdr.flowid = net->flowid;
4064                                 M_HASHTYPE_SET(m, net->flowtype);
4065                         } else {
4066                                 m->m_pkthdr.flowid = mflowid;
4067                                 M_HASHTYPE_SET(m, mflowtype);
4068                         }
4069                         packet_length = sctp_calculate_len(m);
4070                         ip = mtod(m, struct ip *);
4071                         ip->ip_v = IPVERSION;
4072                         ip->ip_hl = (sizeof(struct ip) >> 2);
4073                         if (tos_value == 0) {
4074                                 /*
4075                                  * This means especially, that it is not set
4076                                  * at the SCTP layer. So use the value from
4077                                  * the IP layer.
4078                                  */
4079                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
4080                         }
4081                         tos_value &= 0xfc;
4082                         if (ecn_ok) {
4083                                 tos_value |= sctp_get_ect(stcb);
4084                         }
4085                         if ((nofragment_flag) && (port == 0)) {
4086                                 ip->ip_off = htons(IP_DF);
4087                         } else {
4088                                 ip->ip_off = htons(0);
4089                         }
4090                         /* FreeBSD has a function for ip_id's */
4091                         ip_fillid(ip);
4092
4093                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094                         ip->ip_len = htons(packet_length);
4095                         ip->ip_tos = tos_value;
4096                         if (port) {
4097                                 ip->ip_p = IPPROTO_UDP;
4098                         } else {
4099                                 ip->ip_p = IPPROTO_SCTP;
4100                         }
4101                         ip->ip_sum = 0;
4102                         if (net == NULL) {
4103                                 ro = &iproute;
4104                                 memset(&iproute, 0, sizeof(iproute));
4105                                 memcpy(&ro->ro_dst, to, to->sa_len);
4106                         } else {
4107                                 ro = (sctp_route_t *)&net->ro;
4108                         }
4109                         /* Now the address selection part */
4110                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111
4112                         /* call the routine to select the src address */
4113                         if (net && out_of_asoc_ok == 0) {
4114                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115                                         sctp_free_ifa(net->ro._s_addr);
4116                                         net->ro._s_addr = NULL;
4117                                         net->src_addr_selected = 0;
4118                                         if (ro->ro_rt) {
4119                                                 RTFREE(ro->ro_rt);
4120                                                 ro->ro_rt = NULL;
4121                                         }
4122                                 }
4123                                 if (net->src_addr_selected == 0) {
4124                                         /* Cache the source address */
4125                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126                                             ro, net, 0,
4127                                             vrf_id);
4128                                         net->src_addr_selected = 1;
4129                                 }
4130                                 if (net->ro._s_addr == NULL) {
4131                                         /* No route to host */
4132                                         net->src_addr_selected = 0;
4133                                         sctp_handle_no_route(stcb, net, so_locked);
4134                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135                                         sctp_m_freem(m);
4136                                         return (EHOSTUNREACH);
4137                                 }
4138                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139                         } else {
4140                                 if (over_addr == NULL) {
4141                                         struct sctp_ifa *_lsrc;
4142
4143                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4144                                             net,
4145                                             out_of_asoc_ok,
4146                                             vrf_id);
4147                                         if (_lsrc == NULL) {
4148                                                 sctp_handle_no_route(stcb, net, so_locked);
4149                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150                                                 sctp_m_freem(m);
4151                                                 return (EHOSTUNREACH);
4152                                         }
4153                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4154                                         sctp_free_ifa(_lsrc);
4155                                 } else {
4156                                         ip->ip_src = over_addr->sin.sin_addr;
4157                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158                                 }
4159                         }
4160                         if (port) {
4161                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162                                         sctp_handle_no_route(stcb, net, so_locked);
4163                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164                                         sctp_m_freem(m);
4165                                         return (EHOSTUNREACH);
4166                                 }
4167                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169                                 udp->uh_dport = port;
4170                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171                                 if (V_udp_cksum) {
4172                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173                                 } else {
4174                                         udp->uh_sum = 0;
4175                                 }
4176                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177                         } else {
4178                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179                         }
4180
4181                         sctphdr->src_port = src_port;
4182                         sctphdr->dest_port = dest_port;
4183                         sctphdr->v_tag = v_tag;
4184                         sctphdr->checksum = 0;
4185
4186                         /*
4187                          * If source address selection fails and we find no
4188                          * route then the ip_output should fail as well with
4189                          * a NO_ROUTE_TO_HOST type error. We probably should
4190                          * catch that somewhere and abort the association
4191                          * right away (assuming this is an INIT being sent).
4192                          */
4193                         if (ro->ro_rt == NULL) {
4194                                 /*
4195                                  * src addr selection failed to find a route
4196                                  * (or valid source addr), so we can't get
4197                                  * there from here (yet)!
4198                                  */
4199                                 sctp_handle_no_route(stcb, net, so_locked);
4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201                                 sctp_m_freem(m);
4202                                 return (EHOSTUNREACH);
4203                         }
4204                         if (ro != &iproute) {
4205                                 memcpy(&iproute, ro, sizeof(*ro));
4206                         }
4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212                             (void *)ro->ro_rt);
4213
4214                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215                                 /* failed to prepend data, give up */
4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217                                 sctp_m_freem(m);
4218                                 return (ENOMEM);
4219                         }
4220                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221                         if (port) {
4222 #if defined(SCTP_WITH_NO_CSUM)
4223                                 SCTP_STAT_INCR(sctps_sendnocrc);
4224 #else
4225                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4226                                 SCTP_STAT_INCR(sctps_sendswcrc);
4227 #endif
4228                                 if (V_udp_cksum) {
4229                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4230                                 }
4231                         } else {
4232 #if defined(SCTP_WITH_NO_CSUM)
4233                                 SCTP_STAT_INCR(sctps_sendnocrc);
4234 #else
4235                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4236                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4238 #endif
4239                         }
4240 #ifdef SCTP_PACKET_LOGGING
4241                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4242                                 sctp_packet_log(o_pak);
4243 #endif
4244                         /* send it out.  table id is taken from stcb */
4245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4246                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4247                                 so = SCTP_INP_SO(inp);
4248                                 SCTP_SOCKET_UNLOCK(so, 0);
4249                         }
4250 #endif
4251                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4253                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4254                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4255                                 SCTP_TCB_UNLOCK(stcb);
4256                                 SCTP_SOCKET_LOCK(so, 0);
4257                                 SCTP_TCB_LOCK(stcb);
4258                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4259                         }
4260 #endif
4261                         SCTP_STAT_INCR(sctps_sendpackets);
4262                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4263                         if (ret)
4264                                 SCTP_STAT_INCR(sctps_senderrors);
4265
4266                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4267                         if (net == NULL) {
4268                                 /* free tempy routes */
4269                                 RO_RTFREE(ro);
4270                         } else {
4271                                 /*
4272                                  * PMTU check versus smallest asoc MTU goes
4273                                  * here
4274                                  */
4275                                 if ((ro->ro_rt != NULL) &&
4276                                     (net->ro._s_addr)) {
4277                                         uint32_t mtu;
4278
4279                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4280                                         if (net->port) {
4281                                                 mtu -= sizeof(struct udphdr);
4282                                         }
4283                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4284                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4285                                                 net->mtu = mtu;
4286                                         }
4287                                 } else if (ro->ro_rt == NULL) {
4288                                         /* route was freed */
4289                                         if (net->ro._s_addr &&
4290                                             net->src_addr_selected) {
4291                                                 sctp_free_ifa(net->ro._s_addr);
4292                                                 net->ro._s_addr = NULL;
4293                                         }
4294                                         net->src_addr_selected = 0;
4295                                 }
4296                         }
4297                         return (ret);
4298                 }
4299 #endif
4300 #ifdef INET6
4301         case AF_INET6:
4302                 {
4303                         uint32_t flowlabel, flowinfo;
4304                         struct ip6_hdr *ip6h;
4305                         struct route_in6 ip6route;
4306                         struct ifnet *ifp;
4307                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4308                         int prev_scope = 0;
4309                         struct sockaddr_in6 lsa6_storage;
4310                         int error;
4311                         u_short prev_port = 0;
4312                         int len;
4313
4314                         if (net) {
4315                                 flowlabel = net->flowlabel;
4316                         } else if (stcb) {
4317                                 flowlabel = stcb->asoc.default_flowlabel;
4318                         } else {
4319                                 flowlabel = inp->sctp_ep.default_flowlabel;
4320                         }
4321                         if (flowlabel == 0) {
4322                                 /*
4323                                  * This means especially, that it is not set
4324                                  * at the SCTP layer. So use the value from
4325                                  * the IP layer.
4326                                  */
4327                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4328                         }
4329                         flowlabel &= 0x000fffff;
4330                         len = SCTP_MIN_OVERHEAD;
4331                         if (port) {
4332                                 len += sizeof(struct udphdr);
4333                         }
4334                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4335                         if (newm == NULL) {
4336                                 sctp_m_freem(m);
4337                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4338                                 return (ENOMEM);
4339                         }
4340                         SCTP_ALIGN_TO_END(newm, len);
4341                         SCTP_BUF_LEN(newm) = len;
4342                         SCTP_BUF_NEXT(newm) = m;
4343                         m = newm;
4344                         if (net != NULL) {
4345                                 m->m_pkthdr.flowid = net->flowid;
4346                                 M_HASHTYPE_SET(m, net->flowtype);
4347                         } else {
4348                                 m->m_pkthdr.flowid = mflowid;
4349                                 M_HASHTYPE_SET(m, mflowtype);
4350                         }
4351                         packet_length = sctp_calculate_len(m);
4352
4353                         ip6h = mtod(m, struct ip6_hdr *);
4354                         /* protect *sin6 from overwrite */
4355                         sin6 = (struct sockaddr_in6 *)to;
4356                         tmp = *sin6;
4357                         sin6 = &tmp;
4358
4359                         /* KAME hack: embed scopeid */
4360                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4361                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4362                                 return (EINVAL);
4363                         }
4364                         if (net == NULL) {
4365                                 memset(&ip6route, 0, sizeof(ip6route));
4366                                 ro = (sctp_route_t *)&ip6route;
4367                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4368                         } else {
4369                                 ro = (sctp_route_t *)&net->ro;
4370                         }
4371                         /*
4372                          * We assume here that inp_flow is in host byte
4373                          * order within the TCB!
4374                          */
4375                         if (tos_value == 0) {
4376                                 /*
4377                                  * This means especially, that it is not set
4378                                  * at the SCTP layer. So use the value from
4379                                  * the IP layer.
4380                                  */
4381                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4382                         }
4383                         tos_value &= 0xfc;
4384                         if (ecn_ok) {
4385                                 tos_value |= sctp_get_ect(stcb);
4386                         }
4387                         flowinfo = 0x06;
4388                         flowinfo <<= 8;
4389                         flowinfo |= tos_value;
4390                         flowinfo <<= 20;
4391                         flowinfo |= flowlabel;
4392                         ip6h->ip6_flow = htonl(flowinfo);
4393                         if (port) {
4394                                 ip6h->ip6_nxt = IPPROTO_UDP;
4395                         } else {
4396                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4397                         }
4398                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4399                         ip6h->ip6_dst = sin6->sin6_addr;
4400
4401                         /*
4402                          * Add SRC address selection here: we can only reuse
4403                          * to a limited degree the kame src-addr-sel, since
4404                          * we can try their selection but it may not be
4405                          * bound.
4406                          */
4407                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4408                         lsa6_tmp.sin6_family = AF_INET6;
4409                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4410                         lsa6 = &lsa6_tmp;
4411                         if (net && out_of_asoc_ok == 0) {
4412                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4413                                         sctp_free_ifa(net->ro._s_addr);
4414                                         net->ro._s_addr = NULL;
4415                                         net->src_addr_selected = 0;
4416                                         if (ro->ro_rt) {
4417                                                 RTFREE(ro->ro_rt);
4418                                                 ro->ro_rt = NULL;
4419                                         }
4420                                 }
4421                                 if (net->src_addr_selected == 0) {
4422                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423                                         /* KAME hack: embed scopeid */
4424                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4425                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4426                                                 return (EINVAL);
4427                                         }
4428                                         /* Cache the source address */
4429                                         net->ro._s_addr = sctp_source_address_selection(inp,
4430                                             stcb,
4431                                             ro,
4432                                             net,
4433                                             0,
4434                                             vrf_id);
4435                                         (void)sa6_recoverscope(sin6);
4436                                         net->src_addr_selected = 1;
4437                                 }
4438                                 if (net->ro._s_addr == NULL) {
4439                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4440                                         net->src_addr_selected = 0;
4441                                         sctp_handle_no_route(stcb, net, so_locked);
4442                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443                                         sctp_m_freem(m);
4444                                         return (EHOSTUNREACH);
4445                                 }
4446                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4447                         } else {
4448                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4449                                 /* KAME hack: embed scopeid */
4450                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4451                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4452                                         return (EINVAL);
4453                                 }
4454                                 if (over_addr == NULL) {
4455                                         struct sctp_ifa *_lsrc;
4456
4457                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4458                                             net,
4459                                             out_of_asoc_ok,
4460                                             vrf_id);
4461                                         if (_lsrc == NULL) {
4462                                                 sctp_handle_no_route(stcb, net, so_locked);
4463                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464                                                 sctp_m_freem(m);
4465                                                 return (EHOSTUNREACH);
4466                                         }
4467                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4468                                         sctp_free_ifa(_lsrc);
4469                                 } else {
4470                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4471                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4472                                 }
4473                                 (void)sa6_recoverscope(sin6);
4474                         }
4475                         lsa6->sin6_port = inp->sctp_lport;
4476
4477                         if (ro->ro_rt == NULL) {
4478                                 /*
4479                                  * src addr selection failed to find a route
4480                                  * (or valid source addr), so we can't get
4481                                  * there from here!
4482                                  */
4483                                 sctp_handle_no_route(stcb, net, so_locked);
4484                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485                                 sctp_m_freem(m);
4486                                 return (EHOSTUNREACH);
4487                         }
4488                         /*
4489                          * XXX: sa6 may not have a valid sin6_scope_id in
4490                          * the non-SCOPEDROUTING case.
4491                          */
4492                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4493                         lsa6_storage.sin6_family = AF_INET6;
4494                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4495                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4496                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4497                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4498                                 sctp_m_freem(m);
4499                                 return (error);
4500                         }
4501                         /* XXX */
4502                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4503                         lsa6_storage.sin6_port = inp->sctp_lport;
4504                         lsa6 = &lsa6_storage;
4505                         ip6h->ip6_src = lsa6->sin6_addr;
4506
4507                         if (port) {
4508                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4509                                         sctp_handle_no_route(stcb, net, so_locked);
4510                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4511                                         sctp_m_freem(m);
4512                                         return (EHOSTUNREACH);
4513                                 }
4514                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4515                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4516                                 udp->uh_dport = port;
4517                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4518                                 udp->uh_sum = 0;
4519                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4520                         } else {
4521                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4522                         }
4523
4524                         sctphdr->src_port = src_port;
4525                         sctphdr->dest_port = dest_port;
4526                         sctphdr->v_tag = v_tag;
4527                         sctphdr->checksum = 0;
4528
4529                         /*
4530                          * We set the hop limit now since there is a good
4531                          * chance that our ro pointer is now filled
4532                          */
4533                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4534                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4535
4536 #ifdef SCTP_DEBUG
4537                         /* Copy to be sure something bad is not happening */
4538                         sin6->sin6_addr = ip6h->ip6_dst;
4539                         lsa6->sin6_addr = ip6h->ip6_src;
4540 #endif
4541
4542                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4543                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4544                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4546                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4547                         if (net) {
4548                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4549                                 /*
4550                                  * preserve the port and scope for link
4551                                  * local send
4552                                  */
4553                                 prev_scope = sin6->sin6_scope_id;
4554                                 prev_port = sin6->sin6_port;
4555                         }
4556                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4557                                 /* failed to prepend data, give up */
4558                                 sctp_m_freem(m);
4559                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4560                                 return (ENOMEM);
4561                         }
4562                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4563                         if (port) {
4564 #if defined(SCTP_WITH_NO_CSUM)
4565                                 SCTP_STAT_INCR(sctps_sendnocrc);
4566 #else
4567                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4568                                 SCTP_STAT_INCR(sctps_sendswcrc);
4569 #endif
4570                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4571                                         udp->uh_sum = 0xffff;
4572                                 }
4573                         } else {
4574 #if defined(SCTP_WITH_NO_CSUM)
4575                                 SCTP_STAT_INCR(sctps_sendnocrc);
4576 #else
4577                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4578                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4579                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4580 #endif
4581                         }
4582                         /* send it out. table id is taken from stcb */
4583 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4584                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4585                                 so = SCTP_INP_SO(inp);
4586                                 SCTP_SOCKET_UNLOCK(so, 0);
4587                         }
4588 #endif
4589 #ifdef SCTP_PACKET_LOGGING
4590                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4591                                 sctp_packet_log(o_pak);
4592 #endif
4593                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4595                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4596                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4597                                 SCTP_TCB_UNLOCK(stcb);
4598                                 SCTP_SOCKET_LOCK(so, 0);
4599                                 SCTP_TCB_LOCK(stcb);
4600                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4601                         }
4602 #endif
4603                         if (net) {
4604                                 /* for link local this must be done */
4605                                 sin6->sin6_scope_id = prev_scope;
4606                                 sin6->sin6_port = prev_port;
4607                         }
4608                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4609                         SCTP_STAT_INCR(sctps_sendpackets);
4610                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4611                         if (ret) {
4612                                 SCTP_STAT_INCR(sctps_senderrors);
4613                         }
4614                         if (net == NULL) {
4615                                 /* Now if we had a temp route free it */
4616                                 RO_RTFREE(ro);
4617                         } else {
4618                                 /*
4619                                  * PMTU check versus smallest asoc MTU goes
4620                                  * here
4621                                  */
4622                                 if (ro->ro_rt == NULL) {
4623                                         /* Route was freed */
4624                                         if (net->ro._s_addr &&
4625                                             net->src_addr_selected) {
4626                                                 sctp_free_ifa(net->ro._s_addr);
4627                                                 net->ro._s_addr = NULL;
4628                                         }
4629                                         net->src_addr_selected = 0;
4630                                 }
4631                                 if ((ro->ro_rt != NULL) &&
4632                                     (net->ro._s_addr)) {
4633                                         uint32_t mtu;
4634
4635                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4636                                         if (mtu &&
4637                                             (stcb->asoc.smallest_mtu > mtu)) {
4638                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4639                                                 net->mtu = mtu;
4640                                                 if (net->port) {
4641                                                         net->mtu -= sizeof(struct udphdr);
4642                                                 }
4643                                         }
4644                                 } else if (ifp) {
4645                                         if (ND_IFINFO(ifp)->linkmtu &&
4646                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4647                                                 sctp_mtu_size_reset(inp,
4648                                                     &stcb->asoc,
4649                                                     ND_IFINFO(ifp)->linkmtu);
4650                                         }
4651                                 }
4652                         }
4653                         return (ret);
4654                 }
4655 #endif
4656         default:
4657                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4658                     ((struct sockaddr *)to)->sa_family);
4659                 sctp_m_freem(m);
4660                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4661                 return (EFAULT);
4662         }
4663 }
4664
4665
4666 void
4667 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4668 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4669     SCTP_UNUSED
4670 #endif
4671 )
4672 {
4673         struct mbuf *m, *m_last;
4674         struct sctp_nets *net;
4675         struct sctp_init_chunk *init;
4676         struct sctp_supported_addr_param *sup_addr;
4677         struct sctp_adaptation_layer_indication *ali;
4678         struct sctp_supported_chunk_types_param *pr_supported;
4679         struct sctp_paramhdr *ph;
4680         int cnt_inits_to = 0;
4681         int error;
4682         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4683
4684         /* INIT's always go to the primary (and usually ONLY address) */
4685         net = stcb->asoc.primary_destination;
4686         if (net == NULL) {
4687                 net = TAILQ_FIRST(&stcb->asoc.nets);
4688                 if (net == NULL) {
4689                         /* TSNH */
4690                         return;
4691                 }
4692                 /* we confirm any address we send an INIT to */
4693                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4694                 (void)sctp_set_primary_addr(stcb, NULL, net);
4695         } else {
4696                 /* we confirm any address we send an INIT to */
4697                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698         }
4699         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4700 #ifdef INET6
4701         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4702                 /*
4703                  * special hook, if we are sending to link local it will not
4704                  * show up in our private address count.
4705                  */
4706                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4707                         cnt_inits_to = 1;
4708         }
4709 #endif
4710         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4711                 /* This case should not happen */
4712                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4713                 return;
4714         }
4715         /* start the INIT timer */
4716         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4717
4718         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4719         if (m == NULL) {
4720                 /* No memory, INIT timer will re-attempt. */
4721                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4722                 return;
4723         }
4724         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4725         padding_len = 0;
4726         /* Now lets put the chunk header in place */
4727         init = mtod(m, struct sctp_init_chunk *);
4728         /* now the chunk header */
4729         init->ch.chunk_type = SCTP_INITIATION;
4730         init->ch.chunk_flags = 0;
4731         /* fill in later from mbuf we build */
4732         init->ch.chunk_length = 0;
4733         /* place in my tag */
4734         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4735         /* set up some of the credits. */
4736         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4737             SCTP_MINIMAL_RWND));
4738         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4739         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4740         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4741
4742         /* Adaptation layer indication parameter */
4743         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4744                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4745                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4746                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4747                 ali->ph.param_length = htons(parameter_len);
4748                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4749                 chunk_len += parameter_len;
4750         }
4751         /* ECN parameter */
4752         if (stcb->asoc.ecn_supported == 1) {
4753                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4754                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4755                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4756                 ph->param_length = htons(parameter_len);
4757                 chunk_len += parameter_len;
4758         }
4759         /* PR-SCTP supported parameter */
4760         if (stcb->asoc.prsctp_supported == 1) {
4761                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4762                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4764                 ph->param_length = htons(parameter_len);
4765                 chunk_len += parameter_len;
4766         }
4767         /* Add NAT friendly parameter. */
4768         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4772                 ph->param_length = htons(parameter_len);
4773                 chunk_len += parameter_len;
4774         }
4775         /* And now tell the peer which extensions we support */
4776         num_ext = 0;
4777         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4778         if (stcb->asoc.prsctp_supported == 1) {
4779                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4780                 if (stcb->asoc.idata_supported) {
4781                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4782                 }
4783         }
4784         if (stcb->asoc.auth_supported == 1) {
4785                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4786         }
4787         if (stcb->asoc.asconf_supported == 1) {
4788                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4789                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4790         }
4791         if (stcb->asoc.reconfig_supported == 1) {
4792                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4793         }
4794         if (stcb->asoc.idata_supported) {
4795                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4796         }
4797         if (stcb->asoc.nrsack_supported == 1) {
4798                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4799         }
4800         if (stcb->asoc.pktdrop_supported == 1) {
4801                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4802         }
4803         if (num_ext > 0) {
4804                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4805                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4806                 pr_supported->ph.param_length = htons(parameter_len);
4807                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808                 chunk_len += parameter_len;
4809         }
4810         /* add authentication parameters */
4811         if (stcb->asoc.auth_supported) {
4812                 /* attach RANDOM parameter, if available */
4813                 if (stcb->asoc.authinfo.random != NULL) {
4814                         struct sctp_auth_random *randp;
4815
4816                         if (padding_len > 0) {
4817                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4818                                 chunk_len += padding_len;
4819                                 padding_len = 0;
4820                         }
4821                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4822                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4823                         /* random key already contains the header */
4824                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4825                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826                         chunk_len += parameter_len;
4827                 }
4828                 /* add HMAC_ALGO parameter */
4829                 if (stcb->asoc.local_hmacs != NULL) {
4830                         struct sctp_auth_hmac_algo *hmacs;
4831
4832                         if (padding_len > 0) {
4833                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4834                                 chunk_len += padding_len;
4835                                 padding_len = 0;
4836                         }
4837                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4838                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4839                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4840                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4841                         hmacs->ph.param_length = htons(parameter_len);
4842                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4843                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4844                         chunk_len += parameter_len;
4845                 }
4846                 /* add CHUNKS parameter */
4847                 if (stcb->asoc.local_auth_chunks != NULL) {
4848                         struct sctp_auth_chunk_list *chunks;
4849
4850                         if (padding_len > 0) {
4851                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4852                                 chunk_len += padding_len;
4853                                 padding_len = 0;
4854                         }
4855                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4856                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4857                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4858                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4859                         chunks->ph.param_length = htons(parameter_len);
4860                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4861                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4862                         chunk_len += parameter_len;
4863                 }
4864         }
4865         /* now any cookie time extensions */
4866         if (stcb->asoc.cookie_preserve_req) {
4867                 struct sctp_cookie_perserve_param *cookie_preserve;
4868
4869                 if (padding_len > 0) {
4870                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871                         chunk_len += padding_len;
4872                         padding_len = 0;
4873                 }
4874                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4875                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4876                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4877                 cookie_preserve->ph.param_length = htons(parameter_len);
4878                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4879                 stcb->asoc.cookie_preserve_req = 0;
4880                 chunk_len += parameter_len;
4881         }
4882         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4883                 uint8_t i;
4884
4885                 if (padding_len > 0) {
4886                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887                         chunk_len += padding_len;
4888                         padding_len = 0;
4889                 }
4890                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4891                 if (stcb->asoc.scope.ipv4_addr_legal) {
4892                         parameter_len += (uint16_t)sizeof(uint16_t);
4893                 }
4894                 if (stcb->asoc.scope.ipv6_addr_legal) {
4895                         parameter_len += (uint16_t)sizeof(uint16_t);
4896                 }
4897                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4898                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4899                 sup_addr->ph.param_length = htons(parameter_len);
4900                 i = 0;
4901                 if (stcb->asoc.scope.ipv4_addr_legal) {
4902                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4903                 }
4904                 if (stcb->asoc.scope.ipv6_addr_legal) {
4905                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4906                 }
4907                 padding_len = 4 - 2 * i;
4908                 chunk_len += parameter_len;
4909         }
4910         SCTP_BUF_LEN(m) = chunk_len;
4911         /* now the addresses */
4912         /*
4913          * To optimize this we could put the scoping stuff into a structure
4914          * and remove the individual uint8's from the assoc structure. Then
4915          * we could just sifa in the address within the stcb. But for now
4916          * this is a quick hack to get the address stuff teased apart.
4917          */
4918         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4919             m, cnt_inits_to,
4920             &padding_len, &chunk_len);
4921
4922         init->ch.chunk_length = htons(chunk_len);
4923         if (padding_len > 0) {
4924                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4925                         sctp_m_freem(m);
4926                         return;
4927                 }
4928         }
4929         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4930         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4931             (struct sockaddr *)&net->ro._l_addr,
4932             m, 0, NULL, 0, 0, 0, 0,
4933             inp->sctp_lport, stcb->rport, htonl(0),
4934             net->port, NULL,
4935             0, 0,
4936             so_locked))) {
4937                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4938                 if (error == ENOBUFS) {
4939                         stcb->asoc.ifp_had_enobuf = 1;
4940                         SCTP_STAT_INCR(sctps_lowlevelerr);
4941                 }
4942         } else {
4943                 stcb->asoc.ifp_had_enobuf = 0;
4944         }
4945         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4946         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4947 }
4948
4949 struct mbuf *
4950 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4951     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4952 {
4953         /*
4954          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4955          * being equal to the beginning of the params i.e. (iphlen +
4956          * sizeof(struct sctp_init_msg) parse through the parameters to the
4957          * end of the mbuf verifying that all parameters are known.
4958          *
4959          * For unknown parameters build and return a mbuf with
4960          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4961          * processing this chunk stop, and set *abort_processing to 1.
4962          *
4963          * By having param_offset be pre-set to where parameters begin it is
4964          * hoped that this routine may be reused in the future by new
4965          * features.
4966          */
4967         struct sctp_paramhdr *phdr, params;
4968
4969         struct mbuf *mat, *op_err;
4970         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4971         int at, limit, pad_needed;
4972         uint16_t ptype, plen, padded_size;
4973         int err_at;
4974
4975         *abort_processing = 0;
4976         mat = in_initpkt;
4977         err_at = 0;
4978         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4979         at = param_offset;
4980         op_err = NULL;
4981         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4982         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4983         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4984                 ptype = ntohs(phdr->param_type);
4985                 plen = ntohs(phdr->param_length);
4986                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4987                         /* wacked parameter */
4988                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4989                         goto invalid_size;
4990                 }
4991                 limit -= SCTP_SIZE32(plen);
4992                 /*-
4993                  * All parameters for all chunks that we know/understand are
4994                  * listed here. We process them other places and make
4995                  * appropriate stop actions per the upper bits. However this
4996                  * is the generic routine processor's can call to get back
4997                  * an operr.. to either incorporate (init-ack) or send.
4998                  */
4999                 padded_size = SCTP_SIZE32(plen);
5000                 switch (ptype) {
5001                         /* Param's with variable size */
5002                 case SCTP_HEARTBEAT_INFO:
5003                 case SCTP_STATE_COOKIE:
5004                 case SCTP_UNRECOG_PARAM:
5005                 case SCTP_ERROR_CAUSE_IND:
5006                         /* ok skip fwd */
5007                         at += padded_size;
5008                         break;
5009                         /* Param's with variable size within a range */
5010                 case SCTP_CHUNK_LIST:
5011                 case SCTP_SUPPORTED_CHUNK_EXT:
5012                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5013                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5014                                 goto invalid_size;
5015                         }
5016                         at += padded_size;
5017                         break;
5018                 case SCTP_SUPPORTED_ADDRTYPE:
5019                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5020                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5021                                 goto invalid_size;
5022                         }
5023                         at += padded_size;
5024                         break;
5025                 case SCTP_RANDOM:
5026                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5028                                 goto invalid_size;
5029                         }
5030                         at += padded_size;
5031                         break;
5032                 case SCTP_SET_PRIM_ADDR:
5033                 case SCTP_DEL_IP_ADDRESS:
5034                 case SCTP_ADD_IP_ADDRESS:
5035                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5036                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5037                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5038                                 goto invalid_size;
5039                         }
5040                         at += padded_size;
5041                         break;
5042                         /* Param's with a fixed size */
5043                 case SCTP_IPV4_ADDRESS:
5044                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5045                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5046                                 goto invalid_size;
5047                         }
5048                         at += padded_size;
5049                         break;
5050                 case SCTP_IPV6_ADDRESS:
5051                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5053                                 goto invalid_size;
5054                         }
5055                         at += padded_size;
5056                         break;
5057                 case SCTP_COOKIE_PRESERVE:
5058                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5060                                 goto invalid_size;
5061                         }
5062                         at += padded_size;
5063                         break;
5064                 case SCTP_HAS_NAT_SUPPORT:
5065                         *nat_friendly = 1;
5066                         /* fall through */
5067                 case SCTP_PRSCTP_SUPPORTED:
5068                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5069                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5070                                 goto invalid_size;
5071                         }
5072                         at += padded_size;
5073                         break;
5074                 case SCTP_ECN_CAPABLE:
5075                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5076                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5077                                 goto invalid_size;
5078                         }
5079                         at += padded_size;
5080                         break;
5081                 case SCTP_ULP_ADAPTATION:
5082                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5084                                 goto invalid_size;
5085                         }
5086                         at += padded_size;
5087                         break;
5088                 case SCTP_SUCCESS_REPORT:
5089                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5091                                 goto invalid_size;
5092                         }
5093                         at += padded_size;
5094                         break;
5095                 case SCTP_HOSTNAME_ADDRESS:
5096                         {
5097                                 /* We can NOT handle HOST NAME addresses!! */
5098                                 int l_len;
5099
5100                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5101                                 *abort_processing = 1;
5102                                 if (op_err == NULL) {
5103                                         /* Ok need to try to get a mbuf */
5104 #ifdef INET6
5105                                         l_len = SCTP_MIN_OVERHEAD;
5106 #else
5107                                         l_len = SCTP_MIN_V4_OVERHEAD;
5108 #endif
5109                                         l_len += sizeof(struct sctp_chunkhdr);
5110                                         l_len += plen;
5111                                         l_len += sizeof(struct sctp_paramhdr);
5112                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5113                                         if (op_err) {
5114                                                 SCTP_BUF_LEN(op_err) = 0;
5115                                                 /*
5116                                                  * pre-reserve space for ip
5117                                                  * and sctp header  and
5118                                                  * chunk hdr
5119                                                  */
5120 #ifdef INET6
5121                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5122 #else
5123                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5124 #endif
5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5127                                         }
5128                                 }
5129                                 if (op_err) {
5130                                         /* If we have space */
5131                                         struct sctp_paramhdr s;
5132
5133                                         if (err_at % 4) {
5134                                                 uint32_t cpthis = 0;
5135
5136                                                 pad_needed = 4 - (err_at % 4);
5137                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5138                                                 err_at += pad_needed;
5139                                         }
5140                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5141                                         s.param_length = htons(sizeof(s) + plen);
5142                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5143                                         err_at += sizeof(s);
5144                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5145                                         if (phdr == NULL) {
5146                                                 sctp_m_freem(op_err);
5147                                                 /*
5148                                                  * we are out of memory but
5149                                                  * we still need to have a
5150                                                  * look at what to do (the
5151                                                  * system is in trouble
5152                                                  * though).
5153                                                  */
5154                                                 return (NULL);
5155                                         }
5156                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5157                                 }
5158                                 return (op_err);
5159                                 break;
5160                         }
5161                 default:
5162                         /*
5163                          * we do not recognize the parameter figure out what
5164                          * we do.
5165                          */
5166                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5167                         if ((ptype & 0x4000) == 0x4000) {
5168                                 /* Report bit is set?? */
5169                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5170                                 if (op_err == NULL) {
5171                                         int l_len;
5172
5173                                         /* Ok need to try to get an mbuf */
5174 #ifdef INET6
5175                                         l_len = SCTP_MIN_OVERHEAD;
5176 #else
5177                                         l_len = SCTP_MIN_V4_OVERHEAD;
5178 #endif
5179                                         l_len += sizeof(struct sctp_chunkhdr);
5180                                         l_len += plen;
5181                                         l_len += sizeof(struct sctp_paramhdr);
5182                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5183                                         if (op_err) {
5184                                                 SCTP_BUF_LEN(op_err) = 0;
5185 #ifdef INET6
5186                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5187 #else
5188                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5189 #endif
5190                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5191                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5192                                         }
5193                                 }
5194                                 if (op_err) {
5195                                         /* If we have space */
5196                                         struct sctp_paramhdr s;
5197
5198                                         if (err_at % 4) {
5199                                                 uint32_t cpthis = 0;
5200
5201                                                 pad_needed = 4 - (err_at % 4);
5202                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5203                                                 err_at += pad_needed;
5204                                         }
5205                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5206                                         s.param_length = htons(sizeof(s) + plen);
5207                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5208                                         err_at += sizeof(s);
5209                                         if (plen > sizeof(tempbuf)) {
5210                                                 plen = sizeof(tempbuf);
5211                                         }
5212                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5213                                         if (phdr == NULL) {
5214                                                 sctp_m_freem(op_err);
5215                                                 /*
5216                                                  * we are out of memory but
5217                                                  * we still need to have a
5218                                                  * look at what to do (the
5219                                                  * system is in trouble
5220                                                  * though).
5221                                                  */
5222                                                 op_err = NULL;
5223                                                 goto more_processing;
5224                                         }
5225                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5226                                         err_at += plen;
5227                                 }
5228                         }
5229         more_processing:
5230                         if ((ptype & 0x8000) == 0x0000) {
5231                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5232                                 return (op_err);
5233                         } else {
5234                                 /* skip this chunk and continue processing */
5235                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5236                                 at += SCTP_SIZE32(plen);
5237                         }
5238                         break;
5239
5240                 }
5241                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5242         }
5243         return (op_err);
5244 invalid_size:
5245         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5246         *abort_processing = 1;
5247         if ((op_err == NULL) && phdr) {
5248                 int l_len;
5249 #ifdef INET6
5250                 l_len = SCTP_MIN_OVERHEAD;
5251 #else
5252                 l_len = SCTP_MIN_V4_OVERHEAD;
5253 #endif
5254                 l_len += sizeof(struct sctp_chunkhdr);
5255                 l_len += (2 * sizeof(struct sctp_paramhdr));
5256                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5257                 if (op_err) {
5258                         SCTP_BUF_LEN(op_err) = 0;
5259 #ifdef INET6
5260                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5261 #else
5262                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5263 #endif
5264                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5266                 }
5267         }
5268         if ((op_err) && phdr) {
5269                 struct sctp_paramhdr s;
5270
5271                 if (err_at % 4) {
5272                         uint32_t cpthis = 0;
5273
5274                         pad_needed = 4 - (err_at % 4);
5275                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5276                         err_at += pad_needed;
5277                 }
5278                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5279                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5280                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5281                 err_at += sizeof(s);
5282                 /* Only copy back the p-hdr that caused the issue */
5283                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5284         }
5285         return (op_err);
5286 }
5287
5288 static int
5289 sctp_are_there_new_addresses(struct sctp_association *asoc,
5290     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5291 {
5292         /*
5293          * Given a INIT packet, look through the packet to verify that there
5294          * are NO new addresses. As we go through the parameters add reports
5295          * of any un-understood parameters that require an error.  Also we
5296          * must return (1) to drop the packet if we see a un-understood
5297          * parameter that tells us to drop the chunk.
5298          */
5299         struct sockaddr *sa_touse;
5300         struct sockaddr *sa;
5301         struct sctp_paramhdr *phdr, params;
5302         uint16_t ptype, plen;
5303         uint8_t fnd;
5304         struct sctp_nets *net;
5305         int check_src;
5306 #ifdef INET
5307         struct sockaddr_in sin4, *sa4;
5308 #endif
5309 #ifdef INET6
5310         struct sockaddr_in6 sin6, *sa6;
5311 #endif
5312
5313 #ifdef INET
5314         memset(&sin4, 0, sizeof(sin4));
5315         sin4.sin_family = AF_INET;
5316         sin4.sin_len = sizeof(sin4);
5317 #endif
5318 #ifdef INET6
5319         memset(&sin6, 0, sizeof(sin6));
5320         sin6.sin6_family = AF_INET6;
5321         sin6.sin6_len = sizeof(sin6);
5322 #endif
5323         /* First what about the src address of the pkt ? */
5324         check_src = 0;
5325         switch (src->sa_family) {
5326 #ifdef INET
5327         case AF_INET:
5328                 if (asoc->scope.ipv4_addr_legal) {
5329                         check_src = 1;
5330                 }
5331                 break;
5332 #endif
5333 #ifdef INET6
5334         case AF_INET6:
5335                 if (asoc->scope.ipv6_addr_legal) {
5336                         check_src = 1;
5337                 }
5338                 break;
5339 #endif
5340         default:
5341                 /* TSNH */
5342                 break;
5343         }
5344         if (check_src) {
5345                 fnd = 0;
5346                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5347                         sa = (struct sockaddr *)&net->ro._l_addr;
5348                         if (sa->sa_family == src->sa_family) {
5349 #ifdef INET
5350                                 if (sa->sa_family == AF_INET) {
5351                                         struct sockaddr_in *src4;
5352
5353                                         sa4 = (struct sockaddr_in *)sa;
5354                                         src4 = (struct sockaddr_in *)src;
5355                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5356                                                 fnd = 1;
5357                                                 break;
5358                                         }
5359                                 }
5360 #endif
5361 #ifdef INET6
5362                                 if (sa->sa_family == AF_INET6) {
5363                                         struct sockaddr_in6 *src6;
5364
5365                                         sa6 = (struct sockaddr_in6 *)sa;
5366                                         src6 = (struct sockaddr_in6 *)src;
5367                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5368                                                 fnd = 1;
5369                                                 break;
5370                                         }
5371                                 }
5372 #endif
5373                         }
5374                 }
5375                 if (fnd == 0) {
5376                         /* New address added! no need to look further. */
5377                         return (1);
5378                 }
5379         }
5380         /* Ok so far lets munge through the rest of the packet */
5381         offset += sizeof(struct sctp_init_chunk);
5382         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5383         while (phdr) {
5384                 sa_touse = NULL;
5385                 ptype = ntohs(phdr->param_type);
5386                 plen = ntohs(phdr->param_length);
5387                 switch (ptype) {
5388 #ifdef INET
5389                 case SCTP_IPV4_ADDRESS:
5390                         {
5391                                 struct sctp_ipv4addr_param *p4, p4_buf;
5392
5393                                 phdr = sctp_get_next_param(in_initpkt, offset,
5394                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5395                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5396                                     phdr == NULL) {
5397                                         return (1);
5398                                 }
5399                                 if (asoc->scope.ipv4_addr_legal) {
5400                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5401                                         sin4.sin_addr.s_addr = p4->addr;
5402                                         sa_touse = (struct sockaddr *)&sin4;
5403                                 }
5404                                 break;
5405                         }
5406 #endif
5407 #ifdef INET6
5408                 case SCTP_IPV6_ADDRESS:
5409                         {
5410                                 struct sctp_ipv6addr_param *p6, p6_buf;
5411
5412                                 phdr = sctp_get_next_param(in_initpkt, offset,
5413                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5414                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5415                                     phdr == NULL) {
5416                                         return (1);
5417                                 }
5418                                 if (asoc->scope.ipv6_addr_legal) {
5419                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5420                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5421                                             sizeof(p6->addr));
5422                                         sa_touse = (struct sockaddr *)&sin6;
5423                                 }
5424                                 break;
5425                         }
5426 #endif
5427                 default:
5428                         sa_touse = NULL;
5429                         break;
5430                 }
5431                 if (sa_touse) {
5432                         /* ok, sa_touse points to one to check */
5433                         fnd = 0;
5434                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5435                                 sa = (struct sockaddr *)&net->ro._l_addr;
5436                                 if (sa->sa_family != sa_touse->sa_family) {
5437                                         continue;
5438                                 }
5439 #ifdef INET
5440                                 if (sa->sa_family == AF_INET) {
5441                                         sa4 = (struct sockaddr_in *)sa;
5442                                         if (sa4->sin_addr.s_addr ==
5443                                             sin4.sin_addr.s_addr) {
5444                                                 fnd = 1;
5445                                                 break;
5446                                         }
5447                                 }
5448 #endif
5449 #ifdef INET6
5450                                 if (sa->sa_family == AF_INET6) {
5451                                         sa6 = (struct sockaddr_in6 *)sa;
5452                                         if (SCTP6_ARE_ADDR_EQUAL(
5453                                             sa6, &sin6)) {
5454                                                 fnd = 1;
5455                                                 break;
5456                                         }
5457                                 }
5458 #endif
5459                         }
5460                         if (!fnd) {
5461                                 /* New addr added! no need to look further */
5462                                 return (1);
5463                         }
5464                 }
5465                 offset += SCTP_SIZE32(plen);
5466                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5467         }
5468         return (0);
5469 }
5470
5471 /*
5472  * Given a MBUF chain that was sent into us containing an INIT. Build a
5473  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5474  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5475  * message (i.e. the struct sctp_init_msg).
5476  */
5477 void
5478 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5479     struct sctp_nets *src_net, struct mbuf *init_pkt,
5480     int iphlen, int offset,
5481     struct sockaddr *src, struct sockaddr *dst,
5482     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5483     uint8_t mflowtype, uint32_t mflowid,
5484     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5485 {
5486         struct sctp_association *asoc;
5487         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5488         struct sctp_init_ack_chunk *initack;
5489         struct sctp_adaptation_layer_indication *ali;
5490         struct sctp_supported_chunk_types_param *pr_supported;
5491         struct sctp_paramhdr *ph;
5492         union sctp_sockstore *over_addr;
5493         struct sctp_scoping scp;
5494 #ifdef INET
5495         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5496         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5497         struct sockaddr_in *sin;
5498 #endif
5499 #ifdef INET6
5500         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5501         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5502         struct sockaddr_in6 *sin6;
5503 #endif
5504         struct sockaddr *to;
5505         struct sctp_state_cookie stc;
5506         struct sctp_nets *net = NULL;
5507         uint8_t *signature = NULL;
5508         int cnt_inits_to = 0;
5509         uint16_t his_limit, i_want;
5510         int abort_flag;
5511         int nat_friendly = 0;
5512         int error;
5513         struct socket *so;
5514         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5515
5516         if (stcb) {
5517                 asoc = &stcb->asoc;
5518         } else {
5519                 asoc = NULL;
5520         }
5521         if ((asoc != NULL) &&
5522             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5523                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5524                         /*
5525                          * new addresses, out of here in non-cookie-wait
5526                          * states
5527                          *
5528                          * Send an ABORT, without the new address error
5529                          * cause. This looks no different than if no
5530                          * listener was present.
5531                          */
5532                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5533                             "Address added");
5534                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5535                             mflowtype, mflowid, inp->fibnum,
5536                             vrf_id, port);
5537                         return;
5538                 }
5539                 if (src_net != NULL && (src_net->port != port)) {
5540                         /*
5541                          * change of remote encapsulation port, out of here
5542                          * in non-cookie-wait states
5543                          *
5544                          * Send an ABORT, without an specific error cause.
5545                          * This looks no different than if no listener was
5546                          * present.
5547                          */
5548                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5549                             "Remote encapsulation port changed");
5550                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5551                             mflowtype, mflowid, inp->fibnum,
5552                             vrf_id, port);
5553                         return;
5554                 }
5555         }
5556         abort_flag = 0;
5557         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5558             (offset + sizeof(struct sctp_init_chunk)),
5559             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5560         if (abort_flag) {
5561 do_a_abort:
5562                 if (op_err == NULL) {
5563                         char msg[SCTP_DIAG_INFO_LEN];
5564
5565                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5566                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5567                             msg);
5568                 }
5569                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5570                     init_chk->init.initiate_tag, op_err,
5571                     mflowtype, mflowid, inp->fibnum,
5572                     vrf_id, port);
5573                 return;
5574         }
5575         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5576         if (m == NULL) {
5577                 /* No memory, INIT timer will re-attempt. */
5578                 if (op_err)
5579                         sctp_m_freem(op_err);
5580                 return;
5581         }
5582         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5583         padding_len = 0;
5584
5585         /*
5586          * We might not overwrite the identification[] completely and on
5587          * some platforms time_entered will contain some padding. Therefore
5588          * zero out the cookie to avoid putting uninitialized memory on the
5589          * wire.
5590          */
5591         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5592
5593         /* the time I built cookie */
5594         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5595
5596         /* populate any tie tags */
5597         if (asoc != NULL) {
5598                 /* unlock before tag selections */
5599                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5600                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5601                 stc.cookie_life = asoc->cookie_life;
5602                 net = asoc->primary_destination;
5603         } else {
5604                 stc.tie_tag_my_vtag = 0;
5605                 stc.tie_tag_peer_vtag = 0;
5606                 /* life I will award this cookie */
5607                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5608         }
5609
5610         /* copy in the ports for later check */
5611         stc.myport = sh->dest_port;
5612         stc.peerport = sh->src_port;
5613
5614         /*
5615          * If we wanted to honor cookie life extensions, we would add to
5616          * stc.cookie_life. For now we should NOT honor any extension
5617          */
5618         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5619         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5620                 stc.ipv6_addr_legal = 1;
5621                 if (SCTP_IPV6_V6ONLY(inp)) {
5622                         stc.ipv4_addr_legal = 0;
5623                 } else {
5624                         stc.ipv4_addr_legal = 1;
5625                 }
5626         } else {
5627                 stc.ipv6_addr_legal = 0;
5628                 stc.ipv4_addr_legal = 1;
5629         }
5630         stc.ipv4_scope = 0;
5631         if (net == NULL) {
5632                 to = src;
5633                 switch (dst->sa_family) {
5634 #ifdef INET
5635                 case AF_INET:
5636                         {
5637                                 /* lookup address */
5638                                 stc.address[0] = src4->sin_addr.s_addr;
5639                                 stc.address[1] = 0;
5640                                 stc.address[2] = 0;
5641                                 stc.address[3] = 0;
5642                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5643                                 /* local from address */
5644                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5645                                 stc.laddress[1] = 0;
5646                                 stc.laddress[2] = 0;
5647                                 stc.laddress[3] = 0;
5648                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5649                                 /* scope_id is only for v6 */
5650                                 stc.scope_id = 0;
5651                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5652                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5653                                         stc.ipv4_scope = 1;
5654                                 }
5655                                 /* Must use the address in this case */
5656                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5657                                         stc.loopback_scope = 1;
5658                                         stc.ipv4_scope = 1;
5659                                         stc.site_scope = 1;
5660                                         stc.local_scope = 0;
5661                                 }
5662                                 break;
5663                         }
5664 #endif
5665 #ifdef INET6
5666                 case AF_INET6:
5667                         {
5668                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5669                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5670                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5671                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5672                                         stc.loopback_scope = 1;
5673                                         stc.local_scope = 0;
5674                                         stc.site_scope = 1;
5675                                         stc.ipv4_scope = 1;
5676                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5677                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5678                                         /*
5679                                          * If the new destination or source
5680                                          * is a LINK_LOCAL we must have
5681                                          * common both site and local scope.
5682                                          * Don't set local scope though
5683                                          * since we must depend on the
5684                                          * source to be added implicitly. We
5685                                          * cannot assure just because we
5686                                          * share one link that all links are
5687                                          * common.
5688                                          */
5689                                         stc.local_scope = 0;
5690                                         stc.site_scope = 1;
5691                                         stc.ipv4_scope = 1;
5692                                         /*
5693                                          * we start counting for the private
5694                                          * address stuff at 1. since the
5695                                          * link local we source from won't
5696                                          * show up in our scoped count.
5697                                          */
5698                                         cnt_inits_to = 1;
5699                                         /*
5700                                          * pull out the scope_id from
5701                                          * incoming pkt
5702                                          */
5703                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5704                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5705                                         /*
5706                                          * If the new destination or source
5707                                          * is SITE_LOCAL then we must have
5708                                          * site scope in common.
5709                                          */
5710                                         stc.site_scope = 1;
5711                                 }
5712                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5713                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5714                                 break;
5715                         }
5716 #endif
5717                 default:
5718                         /* TSNH */
5719                         goto do_a_abort;
5720                         break;
5721                 }
5722         } else {
5723                 /* set the scope per the existing tcb */
5724
5725 #ifdef INET6
5726                 struct sctp_nets *lnet;
5727 #endif
5728
5729                 stc.loopback_scope = asoc->scope.loopback_scope;
5730                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5731                 stc.site_scope = asoc->scope.site_scope;
5732                 stc.local_scope = asoc->scope.local_scope;
5733 #ifdef INET6
5734                 /* Why do we not consider IPv4 LL addresses? */
5735                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5736                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5737                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5738                                         /*
5739                                          * if we have a LL address, start
5740                                          * counting at 1.
5741                                          */
5742                                         cnt_inits_to = 1;
5743                                 }
5744                         }
5745                 }
5746 #endif
5747                 /* use the net pointer */
5748                 to = (struct sockaddr *)&net->ro._l_addr;
5749                 switch (to->sa_family) {
5750 #ifdef INET
5751                 case AF_INET:
5752                         sin = (struct sockaddr_in *)to;
5753                         stc.address[0] = sin->sin_addr.s_addr;
5754                         stc.address[1] = 0;
5755                         stc.address[2] = 0;
5756                         stc.address[3] = 0;
5757                         stc.addr_type = SCTP_IPV4_ADDRESS;
5758                         if (net->src_addr_selected == 0) {
5759                                 /*
5760                                  * strange case here, the INIT should have
5761                                  * did the selection.
5762                                  */
5763                                 net->ro._s_addr = sctp_source_address_selection(inp,
5764                                     stcb, (sctp_route_t *)&net->ro,
5765                                     net, 0, vrf_id);
5766                                 if (net->ro._s_addr == NULL)
5767                                         return;
5768
5769                                 net->src_addr_selected = 1;
5770
5771                         }
5772                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5773                         stc.laddress[1] = 0;
5774                         stc.laddress[2] = 0;
5775                         stc.laddress[3] = 0;
5776                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5777                         /* scope_id is only for v6 */
5778                         stc.scope_id = 0;
5779                         break;
5780 #endif
5781 #ifdef INET6
5782                 case AF_INET6:
5783                         sin6 = (struct sockaddr_in6 *)to;
5784                         memcpy(&stc.address, &sin6->sin6_addr,
5785                             sizeof(struct in6_addr));
5786                         stc.addr_type = SCTP_IPV6_ADDRESS;
5787                         stc.scope_id = sin6->sin6_scope_id;
5788                         if (net->src_addr_selected == 0) {
5789                                 /*
5790                                  * strange case here, the INIT should have
5791                                  * done the selection.
5792                                  */
5793                                 net->ro._s_addr = sctp_source_address_selection(inp,
5794                                     stcb, (sctp_route_t *)&net->ro,
5795                                     net, 0, vrf_id);
5796                                 if (net->ro._s_addr == NULL)
5797                                         return;
5798
5799                                 net->src_addr_selected = 1;
5800                         }
5801                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5802                             sizeof(struct in6_addr));
5803                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5804                         break;
5805 #endif
5806                 }
5807         }
5808         /* Now lets put the SCTP header in place */
5809         initack = mtod(m, struct sctp_init_ack_chunk *);
5810         /* Save it off for quick ref */
5811         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5812         /* who are we */
5813         memcpy(stc.identification, SCTP_VERSION_STRING,
5814             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5815         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5816         /* now the chunk header */
5817         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5818         initack->ch.chunk_flags = 0;
5819         /* fill in later from mbuf we build */
5820         initack->ch.chunk_length = 0;
5821         /* place in my tag */
5822         if ((asoc != NULL) &&
5823             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5824             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5825             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5826                 /* re-use the v-tags and init-seq here */
5827                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5828                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5829         } else {
5830                 uint32_t vtag, itsn;
5831
5832                 if (hold_inp_lock) {
5833                         SCTP_INP_INCR_REF(inp);
5834                         SCTP_INP_RUNLOCK(inp);
5835                 }
5836                 if (asoc) {
5837                         atomic_add_int(&asoc->refcnt, 1);
5838                         SCTP_TCB_UNLOCK(stcb);
5839         new_tag:
5840                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5841                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5842                                 /*
5843                                  * Got a duplicate vtag on some guy behind a
5844                                  * nat make sure we don't use it.
5845                                  */
5846                                 goto new_tag;
5847                         }
5848                         initack->init.initiate_tag = htonl(vtag);
5849                         /* get a TSN to use too */
5850                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5851                         initack->init.initial_tsn = htonl(itsn);
5852                         SCTP_TCB_LOCK(stcb);
5853                         atomic_add_int(&asoc->refcnt, -1);
5854                 } else {
5855                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5856                         initack->init.initiate_tag = htonl(vtag);
5857                         /* get a TSN to use too */
5858                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5859                 }
5860                 if (hold_inp_lock) {
5861                         SCTP_INP_RLOCK(inp);
5862                         SCTP_INP_DECR_REF(inp);
5863                 }
5864         }
5865         /* save away my tag to */
5866         stc.my_vtag = initack->init.initiate_tag;
5867
5868         /* set up some of the credits. */
5869         so = inp->sctp_socket;
5870         if (so == NULL) {
5871                 /* memory problem */
5872                 sctp_m_freem(m);
5873                 return;
5874         } else {
5875                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5876         }
5877         /* set what I want */
5878         his_limit = ntohs(init_chk->init.num_inbound_streams);
5879         /* choose what I want */
5880         if (asoc != NULL) {
5881                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5882                         i_want = asoc->streamoutcnt;
5883                 } else {
5884                         i_want = asoc->pre_open_streams;
5885                 }
5886         } else {
5887                 i_want = inp->sctp_ep.pre_open_stream_count;
5888         }
5889         if (his_limit < i_want) {
5890                 /* I Want more :< */
5891                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5892         } else {
5893                 /* I can have what I want :> */
5894                 initack->init.num_outbound_streams = htons(i_want);
5895         }
5896         /* tell him his limit. */
5897         initack->init.num_inbound_streams =
5898             htons(inp->sctp_ep.max_open_streams_intome);
5899
5900         /* adaptation layer indication parameter */
5901         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5902                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5903                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5904                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5905                 ali->ph.param_length = htons(parameter_len);
5906                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5907                 chunk_len += parameter_len;
5908         }
5909         /* ECN parameter */
5910         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5911             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5912                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5913                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5914                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5915                 ph->param_length = htons(parameter_len);
5916                 chunk_len += parameter_len;
5917         }
5918         /* PR-SCTP supported parameter */
5919         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5920             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5921                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5922                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5923                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5924                 ph->param_length = htons(parameter_len);
5925                 chunk_len += parameter_len;
5926         }
5927         /* Add NAT friendly parameter */
5928         if (nat_friendly) {
5929                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5930                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5931                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5932                 ph->param_length = htons(parameter_len);
5933                 chunk_len += parameter_len;
5934         }
5935         /* And now tell the peer which extensions we support */
5936         num_ext = 0;
5937         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5938         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5939             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5940                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5941                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5942                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5943                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5944                 }
5945         }
5946         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5947             ((asoc == NULL) && (inp->auth_supported == 1))) {
5948                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5949         }
5950         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5951             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5952                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5953                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5954         }
5955         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5956             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5957                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5958         }
5959         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5960             ((asoc == NULL) && (inp->idata_supported == 1))) {
5961                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5962         }
5963         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5964             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5965                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5966         }
5967         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5968             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5969                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5970         }
5971         if (num_ext > 0) {
5972                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5973                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5974                 pr_supported->ph.param_length = htons(parameter_len);
5975                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5976                 chunk_len += parameter_len;
5977         }
5978         /* add authentication parameters */
5979         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5980             ((asoc == NULL) && (inp->auth_supported == 1))) {
5981                 struct sctp_auth_random *randp;
5982                 struct sctp_auth_hmac_algo *hmacs;
5983                 struct sctp_auth_chunk_list *chunks;
5984
5985                 if (padding_len > 0) {
5986                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5987                         chunk_len += padding_len;
5988                         padding_len = 0;
5989                 }
5990                 /* generate and add RANDOM parameter */
5991                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5992                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5993                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5994                 randp->ph.param_type = htons(SCTP_RANDOM);
5995                 randp->ph.param_length = htons(parameter_len);
5996                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5997                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5998                 chunk_len += parameter_len;
5999
6000                 if (padding_len > 0) {
6001                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6002                         chunk_len += padding_len;
6003                         padding_len = 0;
6004                 }
6005                 /* add HMAC_ALGO parameter */
6006                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6007                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6008                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6009                     (uint8_t *)hmacs->hmac_ids);
6010                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6011                 hmacs->ph.param_length = htons(parameter_len);
6012                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6013                 chunk_len += parameter_len;
6014
6015                 if (padding_len > 0) {
6016                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6017                         chunk_len += padding_len;
6018                         padding_len = 0;
6019                 }
6020                 /* add CHUNKS parameter */
6021                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6022                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6023                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6024                     chunks->chunk_types);
6025                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6026                 chunks->ph.param_length = htons(parameter_len);
6027                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6028                 chunk_len += parameter_len;
6029         }
6030         SCTP_BUF_LEN(m) = chunk_len;
6031         m_last = m;
6032         /* now the addresses */
6033         /*
6034          * To optimize this we could put the scoping stuff into a structure
6035          * and remove the individual uint8's from the stc structure. Then we
6036          * could just sifa in the address within the stc.. but for now this
6037          * is a quick hack to get the address stuff teased apart.
6038          */
6039         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6040         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6041         scp.loopback_scope = stc.loopback_scope;
6042         scp.ipv4_local_scope = stc.ipv4_scope;
6043         scp.local_scope = stc.local_scope;
6044         scp.site_scope = stc.site_scope;
6045         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6046             cnt_inits_to,
6047             &padding_len, &chunk_len);
6048         /* padding_len can only be positive, if no addresses have been added */
6049         if (padding_len > 0) {
6050                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6051                 chunk_len += padding_len;
6052                 SCTP_BUF_LEN(m) += padding_len;
6053                 padding_len = 0;
6054         }
6055         /* tack on the operational error if present */
6056         if (op_err) {
6057                 parameter_len = 0;
6058                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6059                         parameter_len += SCTP_BUF_LEN(m_tmp);
6060                 }
6061                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6062                 SCTP_BUF_NEXT(m_last) = op_err;
6063                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6064                         m_last = SCTP_BUF_NEXT(m_last);
6065                 }
6066                 chunk_len += parameter_len;
6067         }
6068         if (padding_len > 0) {
6069                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6070                 if (m_last == NULL) {
6071                         /* Houston we have a problem, no space */
6072                         sctp_m_freem(m);
6073                         return;
6074                 }
6075                 chunk_len += padding_len;
6076                 padding_len = 0;
6077         }
6078         /* Now we must build a cookie */
6079         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6080         if (m_cookie == NULL) {
6081                 /* memory problem */
6082                 sctp_m_freem(m);
6083                 return;
6084         }
6085         /* Now append the cookie to the end and update the space/size */
6086         SCTP_BUF_NEXT(m_last) = m_cookie;
6087         parameter_len = 0;
6088         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6089                 parameter_len += SCTP_BUF_LEN(m_tmp);
6090                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6091                         m_last = m_tmp;
6092                 }
6093         }
6094         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6095         chunk_len += parameter_len;
6096
6097         /*
6098          * Place in the size, but we don't include the last pad (if any) in
6099          * the INIT-ACK.
6100          */
6101         initack->ch.chunk_length = htons(chunk_len);
6102
6103         /*
6104          * Time to sign the cookie, we don't sign over the cookie signature
6105          * though thus we set trailer.
6106          */
6107         (void)sctp_hmac_m(SCTP_HMAC,
6108             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6109             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6110             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6111         /*
6112          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6113          * here since the timer will drive a retranmission.
6114          */
6115         if (padding_len > 0) {
6116                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6117                         sctp_m_freem(m);
6118                         return;
6119                 }
6120         }
6121         if (stc.loopback_scope) {
6122                 over_addr = (union sctp_sockstore *)dst;
6123         } else {
6124                 over_addr = NULL;
6125         }
6126
6127         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6128             0, 0,
6129             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6130             port, over_addr,
6131             mflowtype, mflowid,
6132             SCTP_SO_NOT_LOCKED))) {
6133                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6134                 if (error == ENOBUFS) {
6135                         if (asoc != NULL) {
6136                                 asoc->ifp_had_enobuf = 1;
6137                         }
6138                         SCTP_STAT_INCR(sctps_lowlevelerr);
6139                 }
6140         } else {
6141                 if (asoc != NULL) {
6142                         asoc->ifp_had_enobuf = 0;
6143                 }
6144         }
6145         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6146 }
6147
6148
6149 static void
6150 sctp_prune_prsctp(struct sctp_tcb *stcb,
6151     struct sctp_association *asoc,
6152     struct sctp_sndrcvinfo *srcv,
6153     int dataout)
6154 {
6155         int freed_spc = 0;
6156         struct sctp_tmit_chunk *chk, *nchk;
6157
6158         SCTP_TCB_LOCK_ASSERT(stcb);
6159         if ((asoc->prsctp_supported) &&
6160             (asoc->sent_queue_cnt_removeable > 0)) {
6161                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6162                         /*
6163                          * Look for chunks marked with the PR_SCTP flag AND
6164                          * the buffer space flag. If the one being sent is
6165                          * equal or greater priority then purge the old one
6166                          * and free some space.
6167                          */
6168                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6169                                 /*
6170                                  * This one is PR-SCTP AND buffer space
6171                                  * limited type
6172                                  */
6173                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6174                                         /*
6175                                          * Lower numbers equates to higher
6176                                          * priority so if the one we are
6177                                          * looking at has a larger or equal
6178                                          * priority we want to drop the data
6179                                          * and NOT retransmit it.
6180                                          */
6181                                         if (chk->data) {
6182                                                 /*
6183                                                  * We release the book_size
6184                                                  * if the mbuf is here
6185                                                  */
6186                                                 int ret_spc;
6187                                                 uint8_t sent;
6188
6189                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6190                                                         sent = 1;
6191                                                 else
6192                                                         sent = 0;
6193                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6194                                                     sent,
6195                                                     SCTP_SO_LOCKED);
6196                                                 freed_spc += ret_spc;
6197                                                 if (freed_spc >= dataout) {
6198                                                         return;
6199                                                 }
6200                                         }       /* if chunk was present */
6201                                 }       /* if of sufficient priority */
6202                         }       /* if chunk has enabled */
6203                 }               /* tailqforeach */
6204
6205                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6206                         /* Here we must move to the sent queue and mark */
6207                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6208                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6209                                         if (chk->data) {
6210                                                 /*
6211                                                  * We release the book_size
6212                                                  * if the mbuf is here
6213                                                  */
6214                                                 int ret_spc;
6215
6216                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6217                                                     0, SCTP_SO_LOCKED);
6218
6219                                                 freed_spc += ret_spc;
6220                                                 if (freed_spc >= dataout) {
6221                                                         return;
6222                                                 }
6223                                         }       /* end if chk->data */
6224                                 }       /* end if right class */
6225                         }       /* end if chk pr-sctp */
6226                 }               /* tailqforeachsafe (chk) */
6227         }                       /* if enabled in asoc */
6228 }
6229
6230 int
6231 sctp_get_frag_point(struct sctp_tcb *stcb,
6232     struct sctp_association *asoc)
6233 {
6234         int siz, ovh;
6235
6236         /*
6237          * For endpoints that have both v6 and v4 addresses we must reserve
6238          * room for the ipv6 header, for those that are only dealing with V4
6239          * we use a larger frag point.
6240          */
6241         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6242                 ovh = SCTP_MIN_OVERHEAD;
6243         } else {
6244                 ovh = SCTP_MIN_V4_OVERHEAD;
6245         }
6246         if (stcb->asoc.idata_supported) {
6247                 ovh += sizeof(struct sctp_idata_chunk);
6248         } else {
6249                 ovh += sizeof(struct sctp_data_chunk);
6250         }
6251         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6252                 siz = asoc->smallest_mtu - ovh;
6253         else
6254                 siz = (stcb->asoc.sctp_frag_point - ovh);
6255         /*
6256          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6257          */
6258         /* A data chunk MUST fit in a cluster */
6259         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6260         /* } */
6261
6262         /* adjust for an AUTH chunk if DATA requires auth */
6263         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6264                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6265
6266         if (siz % 4) {
6267                 /* make it an even word boundary please */
6268                 siz -= (siz % 4);
6269         }
6270         return (siz);
6271 }
6272
6273 static void
6274 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6275 {
6276         /*
6277          * We assume that the user wants PR_SCTP_TTL if the user provides a
6278          * positive lifetime but does not specify any PR_SCTP policy.
6279          */
6280         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6281                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6282         } else if (sp->timetolive > 0) {
6283                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6284                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6285         } else {
6286                 return;
6287         }
6288         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6289         case CHUNK_FLAGS_PR_SCTP_BUF:
6290                 /*
6291                  * Time to live is a priority stored in tv_sec when doing
6292                  * the buffer drop thing.
6293                  */
6294                 sp->ts.tv_sec = sp->timetolive;
6295                 sp->ts.tv_usec = 0;
6296                 break;
6297         case CHUNK_FLAGS_PR_SCTP_TTL:
6298                 {
6299                         struct timeval tv;
6300
6301                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6302                         tv.tv_sec = sp->timetolive / 1000;
6303                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6304                         /*
6305                          * TODO sctp_constants.h needs alternative time
6306                          * macros when _KERNEL is undefined.
6307                          */
6308                         timevaladd(&sp->ts, &tv);
6309                 }
6310                 break;
6311         case CHUNK_FLAGS_PR_SCTP_RTX:
6312                 /*
6313                  * Time to live is a the number or retransmissions stored in
6314                  * tv_sec.
6315                  */
6316                 sp->ts.tv_sec = sp->timetolive;
6317                 sp->ts.tv_usec = 0;
6318                 break;
6319         default:
6320                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6321                     "Unknown PR_SCTP policy %u.\n",
6322                     PR_SCTP_POLICY(sp->sinfo_flags));
6323                 break;
6324         }
6325 }
6326
6327 static int
6328 sctp_msg_append(struct sctp_tcb *stcb,
6329     struct sctp_nets *net,
6330     struct mbuf *m,
6331     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6332 {
6333         int error = 0;
6334         struct mbuf *at;
6335         struct sctp_stream_queue_pending *sp = NULL;
6336         struct sctp_stream_out *strm;
6337
6338         /*
6339          * Given an mbuf chain, put it into the association send queue and
6340          * place it on the wheel
6341          */
6342         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6343                 /* Invalid stream number */
6344                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6345                 error = EINVAL;
6346                 goto out_now;
6347         }
6348         if ((stcb->asoc.stream_locked) &&
6349             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6350                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6351                 error = EINVAL;
6352                 goto out_now;
6353         }
6354         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6355         /* Now can we send this? */
6356         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6357             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6358             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6359             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6360                 /* got data while shutting down */
6361                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6362                 error = ECONNRESET;
6363                 goto out_now;
6364         }
6365         sctp_alloc_a_strmoq(stcb, sp);
6366         if (sp == NULL) {
6367                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6368                 error = ENOMEM;
6369                 goto out_now;
6370         }
6371         sp->sinfo_flags = srcv->sinfo_flags;
6372         sp->timetolive = srcv->sinfo_timetolive;
6373         sp->ppid = srcv->sinfo_ppid;
6374         sp->context = srcv->sinfo_context;
6375         sp->fsn = 0;
6376         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6377                 sp->net = net;
6378                 atomic_add_int(&sp->net->ref_count, 1);
6379         } else {
6380                 sp->net = NULL;
6381         }
6382         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6383         sp->sid = srcv->sinfo_stream;
6384         sp->msg_is_complete = 1;
6385         sp->sender_all_done = 1;
6386         sp->some_taken = 0;
6387         sp->data = m;
6388         sp->tail_mbuf = NULL;
6389         sctp_set_prsctp_policy(sp);
6390         /*
6391          * We could in theory (for sendall) sifa the length in, but we would
6392          * still have to hunt through the chain since we need to setup the
6393          * tail_mbuf
6394          */
6395         sp->length = 0;
6396         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6397                 if (SCTP_BUF_NEXT(at) == NULL)
6398                         sp->tail_mbuf = at;
6399                 sp->length += SCTP_BUF_LEN(at);
6400         }
6401         if (srcv->sinfo_keynumber_valid) {
6402                 sp->auth_keyid = srcv->sinfo_keynumber;
6403         } else {
6404                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6405         }
6406         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6407                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6408                 sp->holds_key_ref = 1;
6409         }
6410         if (hold_stcb_lock == 0) {
6411                 SCTP_TCB_SEND_LOCK(stcb);
6412         }
6413         sctp_snd_sb_alloc(stcb, sp->length);
6414         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6415         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6416         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6417         m = NULL;
6418         if (hold_stcb_lock == 0) {
6419                 SCTP_TCB_SEND_UNLOCK(stcb);
6420         }
6421 out_now:
6422         if (m) {
6423                 sctp_m_freem(m);
6424         }
6425         return (error);
6426 }
6427
6428
6429 static struct mbuf *
6430 sctp_copy_mbufchain(struct mbuf *clonechain,
6431     struct mbuf *outchain,
6432     struct mbuf **endofchain,
6433     int can_take_mbuf,
6434     int sizeofcpy,
6435     uint8_t copy_by_ref)
6436 {
6437         struct mbuf *m;
6438         struct mbuf *appendchain;
6439         caddr_t cp;
6440         int len;
6441
6442         if (endofchain == NULL) {
6443                 /* error */
6444 error_out:
6445                 if (outchain)
6446                         sctp_m_freem(outchain);
6447                 return (NULL);
6448         }
6449         if (can_take_mbuf) {
6450                 appendchain = clonechain;
6451         } else {
6452                 if (!copy_by_ref &&
6453                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6454                     ) {
6455                         /* Its not in a cluster */
6456                         if (*endofchain == NULL) {
6457                                 /* lets get a mbuf cluster */
6458                                 if (outchain == NULL) {
6459                                         /* This is the general case */
6460                         new_mbuf:
6461                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6462                                         if (outchain == NULL) {
6463                                                 goto error_out;
6464                                         }
6465                                         SCTP_BUF_LEN(outchain) = 0;
6466                                         *endofchain = outchain;
6467                                         /* get the prepend space */
6468                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6469                                 } else {
6470                                         /*
6471                                          * We really should not get a NULL
6472                                          * in endofchain
6473                                          */
6474                                         /* find end */
6475                                         m = outchain;
6476                                         while (m) {
6477                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6478                                                         *endofchain = m;
6479                                                         break;
6480                                                 }
6481                                                 m = SCTP_BUF_NEXT(m);
6482                                         }
6483                                         /* sanity */
6484                                         if (*endofchain == NULL) {
6485                                                 /*
6486                                                  * huh, TSNH XXX maybe we
6487                                                  * should panic
6488                                                  */
6489                                                 sctp_m_freem(outchain);
6490                                                 goto new_mbuf;
6491                                         }
6492                                 }
6493                                 /* get the new end of length */
6494                                 len = (int)M_TRAILINGSPACE(*endofchain);
6495                         } else {
6496                                 /* how much is left at the end? */
6497                                 len = (int)M_TRAILINGSPACE(*endofchain);
6498                         }
6499                         /* Find the end of the data, for appending */
6500                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6501
6502                         /* Now lets copy it out */
6503                         if (len >= sizeofcpy) {
6504                                 /* It all fits, copy it in */
6505                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6506                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6507                         } else {
6508                                 /* fill up the end of the chain */
6509                                 if (len > 0) {
6510                                         m_copydata(clonechain, 0, len, cp);
6511                                         SCTP_BUF_LEN((*endofchain)) += len;
6512                                         /* now we need another one */
6513                                         sizeofcpy -= len;
6514                                 }
6515                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6516                                 if (m == NULL) {
6517                                         /* We failed */
6518                                         goto error_out;
6519                                 }
6520                                 SCTP_BUF_NEXT((*endofchain)) = m;
6521                                 *endofchain = m;
6522                                 cp = mtod((*endofchain), caddr_t);
6523                                 m_copydata(clonechain, len, sizeofcpy, cp);
6524                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6525                         }
6526                         return (outchain);
6527                 } else {
6528                         /* copy the old fashion way */
6529                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6530 #ifdef SCTP_MBUF_LOGGING
6531                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6532                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6533                         }
6534 #endif
6535                 }
6536         }
6537         if (appendchain == NULL) {
6538                 /* error */
6539                 if (outchain)
6540                         sctp_m_freem(outchain);
6541                 return (NULL);
6542         }
6543         if (outchain) {
6544                 /* tack on to the end */
6545                 if (*endofchain != NULL) {
6546                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6547                 } else {
6548                         m = outchain;
6549                         while (m) {
6550                                 if (SCTP_BUF_NEXT(m) == NULL) {
6551                                         SCTP_BUF_NEXT(m) = appendchain;
6552                                         break;
6553                                 }
6554                                 m = SCTP_BUF_NEXT(m);
6555                         }
6556                 }
6557                 /*
6558                  * save off the end and update the end-chain position
6559                  */
6560                 m = appendchain;
6561                 while (m) {
6562                         if (SCTP_BUF_NEXT(m) == NULL) {
6563                                 *endofchain = m;
6564                                 break;
6565                         }
6566                         m = SCTP_BUF_NEXT(m);
6567                 }
6568                 return (outchain);
6569         } else {
6570                 /* save off the end and update the end-chain position */
6571                 m = appendchain;
6572                 while (m) {
6573                         if (SCTP_BUF_NEXT(m) == NULL) {
6574                                 *endofchain = m;
6575                                 break;
6576                         }
6577                         m = SCTP_BUF_NEXT(m);
6578                 }
6579                 return (appendchain);
6580         }
6581 }
6582
6583 static int
6584 sctp_med_chunk_output(struct sctp_inpcb *inp,
6585     struct sctp_tcb *stcb,
6586     struct sctp_association *asoc,
6587     int *num_out,
6588     int *reason_code,
6589     int control_only, int from_where,
6590     struct timeval *now, int *now_filled, int frag_point, int so_locked
6591 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6592     SCTP_UNUSED
6593 #endif
6594 );
6595
6596 static void
6597 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6598     uint32_t val SCTP_UNUSED)
6599 {
6600         struct sctp_copy_all *ca;
6601         struct mbuf *m;
6602         int ret = 0;
6603         int added_control = 0;
6604         int un_sent, do_chunk_output = 1;
6605         struct sctp_association *asoc;
6606         struct sctp_nets *net;
6607
6608         ca = (struct sctp_copy_all *)ptr;
6609         if (ca->m == NULL) {
6610                 return;
6611         }
6612         if (ca->inp != inp) {
6613                 /* TSNH */
6614                 return;
6615         }
6616         if (ca->sndlen > 0) {
6617                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6618                 if (m == NULL) {
6619                         /* can't copy so we are done */
6620                         ca->cnt_failed++;
6621                         return;
6622                 }
6623 #ifdef SCTP_MBUF_LOGGING
6624                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6625                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6626                 }
6627 #endif
6628         } else {
6629                 m = NULL;
6630         }
6631         SCTP_TCB_LOCK_ASSERT(stcb);
6632         if (stcb->asoc.alternate) {
6633                 net = stcb->asoc.alternate;
6634         } else {
6635                 net = stcb->asoc.primary_destination;
6636         }
6637         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6638                 /* Abort this assoc with m as the user defined reason */
6639                 if (m != NULL) {
6640                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6641                 } else {
6642                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6643                             0, M_NOWAIT, 1, MT_DATA);
6644                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6645                 }
6646                 if (m != NULL) {
6647                         struct sctp_paramhdr *ph;
6648
6649                         ph = mtod(m, struct sctp_paramhdr *);
6650                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6651                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6652                 }
6653                 /*
6654                  * We add one here to keep the assoc from dis-appearing on
6655                  * us.
6656                  */
6657                 atomic_add_int(&stcb->asoc.refcnt, 1);
6658                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6659                 /*
6660                  * sctp_abort_an_association calls sctp_free_asoc() free
6661                  * association will NOT free it since we incremented the
6662                  * refcnt .. we do this to prevent it being freed and things
6663                  * getting tricky since we could end up (from free_asoc)
6664                  * calling inpcb_free which would get a recursive lock call
6665                  * to the iterator lock.. But as a consequence of that the
6666                  * stcb will return to us un-locked.. since free_asoc
6667                  * returns with either no TCB or the TCB unlocked, we must
6668                  * relock.. to unlock in the iterator timer :-0
6669                  */
6670                 SCTP_TCB_LOCK(stcb);
6671                 atomic_add_int(&stcb->asoc.refcnt, -1);
6672                 goto no_chunk_output;
6673         } else {
6674                 if (m) {
6675                         ret = sctp_msg_append(stcb, net, m,
6676                             &ca->sndrcv, 1);
6677                 }
6678                 asoc = &stcb->asoc;
6679                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6680                         /* shutdown this assoc */
6681                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6682                             TAILQ_EMPTY(&asoc->sent_queue) &&
6683                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6684                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6685                                         goto abort_anyway;
6686                                 }
6687                                 /*
6688                                  * there is nothing queued to send, so I'm
6689                                  * done...
6690                                  */
6691                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6692                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6693                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6694                                         /*
6695                                          * only send SHUTDOWN the first time
6696                                          * through
6697                                          */
6698                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6699                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6700                                         }
6701                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6702                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6703                                         sctp_stop_timers_for_shutdown(stcb);
6704                                         sctp_send_shutdown(stcb, net);
6705                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6706                                             net);
6707                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6708                                             asoc->primary_destination);
6709                                         added_control = 1;
6710                                         do_chunk_output = 0;
6711                                 }
6712                         } else {
6713                                 /*
6714                                  * we still got (or just got) data to send,
6715                                  * so set SHUTDOWN_PENDING
6716                                  */
6717                                 /*
6718                                  * XXX sockets draft says that SCTP_EOF
6719                                  * should be sent with no data.  currently,
6720                                  * we will allow user data to be sent first
6721                                  * and move to SHUTDOWN-PENDING
6722                                  */
6723                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6724                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6725                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6726                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6727                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6728                                         }
6729                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6730                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6731                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6732                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6733                                                 struct mbuf *op_err;
6734                                                 char msg[SCTP_DIAG_INFO_LEN];
6735
6736                                 abort_anyway:
6737                                                 snprintf(msg, sizeof(msg),
6738                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6739                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6740                                                     msg);
6741                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6742                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6743                                                     op_err, SCTP_SO_NOT_LOCKED);
6744                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6745                                                 goto no_chunk_output;
6746                                         }
6747                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6748                                             asoc->primary_destination);
6749                                 }
6750                         }
6751
6752                 }
6753         }
6754         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6755             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6756
6757         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6758             (stcb->asoc.total_flight > 0) &&
6759             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6760                 do_chunk_output = 0;
6761         }
6762         if (do_chunk_output)
6763                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6764         else if (added_control) {
6765                 int num_out, reason, now_filled = 0;
6766                 struct timeval now;
6767                 int frag_point;
6768
6769                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6770                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6771                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6772         }
6773 no_chunk_output:
6774         if (ret) {
6775                 ca->cnt_failed++;
6776         } else {
6777                 ca->cnt_sent++;
6778         }
6779 }
6780
6781 static void
6782 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6783 {
6784         struct sctp_copy_all *ca;
6785
6786         ca = (struct sctp_copy_all *)ptr;
6787         /*
6788          * Do a notify here? Kacheong suggests that the notify be done at
6789          * the send time.. so you would push up a notification if any send
6790          * failed. Don't know if this is feasible since the only failures we
6791          * have is "memory" related and if you cannot get an mbuf to send
6792          * the data you surely can't get an mbuf to send up to notify the
6793          * user you can't send the data :->
6794          */
6795
6796         /* now free everything */
6797         sctp_m_freem(ca->m);
6798         SCTP_FREE(ca, SCTP_M_COPYAL);
6799 }
6800
6801 static struct mbuf *
6802 sctp_copy_out_all(struct uio *uio, int len)
6803 {
6804         struct mbuf *ret, *at;
6805         int left, willcpy, cancpy, error;
6806
6807         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6808         if (ret == NULL) {
6809                 /* TSNH */
6810                 return (NULL);
6811         }
6812         left = len;
6813         SCTP_BUF_LEN(ret) = 0;
6814         /* save space for the data chunk header */
6815         cancpy = (int)M_TRAILINGSPACE(ret);
6816         willcpy = min(cancpy, left);
6817         at = ret;
6818         while (left > 0) {
6819                 /* Align data to the end */
6820                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6821                 if (error) {
6822         err_out_now:
6823                         sctp_m_freem(at);
6824                         return (NULL);
6825                 }
6826                 SCTP_BUF_LEN(at) = willcpy;
6827                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6828                 left -= willcpy;
6829                 if (left > 0) {
6830                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6831                         if (SCTP_BUF_NEXT(at) == NULL) {
6832                                 goto err_out_now;
6833                         }
6834                         at = SCTP_BUF_NEXT(at);
6835                         SCTP_BUF_LEN(at) = 0;
6836                         cancpy = (int)M_TRAILINGSPACE(at);
6837                         willcpy = min(cancpy, left);
6838                 }
6839         }
6840         return (ret);
6841 }
6842
6843 static int
6844 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6845     struct sctp_sndrcvinfo *srcv)
6846 {
6847         int ret;
6848         struct sctp_copy_all *ca;
6849
6850         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6851             SCTP_M_COPYAL);
6852         if (ca == NULL) {
6853                 sctp_m_freem(m);
6854                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6855                 return (ENOMEM);
6856         }
6857         memset(ca, 0, sizeof(struct sctp_copy_all));
6858
6859         ca->inp = inp;
6860         if (srcv) {
6861                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6862         }
6863         /*
6864          * take off the sendall flag, it would be bad if we failed to do
6865          * this :-0
6866          */
6867         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6868         /* get length and mbuf chain */
6869         if (uio) {
6870                 ca->sndlen = (int)uio->uio_resid;
6871                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6872                 if (ca->m == NULL) {
6873                         SCTP_FREE(ca, SCTP_M_COPYAL);
6874                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6875                         return (ENOMEM);
6876                 }
6877         } else {
6878                 /* Gather the length of the send */
6879                 struct mbuf *mat;
6880
6881                 ca->sndlen = 0;
6882                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6883                         ca->sndlen += SCTP_BUF_LEN(mat);
6884                 }
6885         }
6886         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6887             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6888             SCTP_ASOC_ANY_STATE,
6889             (void *)ca, 0,
6890             sctp_sendall_completes, inp, 1);
6891         if (ret) {
6892                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6893                 SCTP_FREE(ca, SCTP_M_COPYAL);
6894                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6895                 return (EFAULT);
6896         }
6897         return (0);
6898 }
6899
6900
6901 void
6902 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6903 {
6904         struct sctp_tmit_chunk *chk, *nchk;
6905
6906         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6907                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6908                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6909                         if (chk->data) {
6910                                 sctp_m_freem(chk->data);
6911                                 chk->data = NULL;
6912                         }
6913                         asoc->ctrl_queue_cnt--;
6914                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6915                 }
6916         }
6917 }
6918
6919 void
6920 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6921 {
6922         struct sctp_association *asoc;
6923         struct sctp_tmit_chunk *chk, *nchk;
6924         struct sctp_asconf_chunk *acp;
6925
6926         asoc = &stcb->asoc;
6927         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6928                 /* find SCTP_ASCONF chunk in queue */
6929                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6930                         if (chk->data) {
6931                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6932                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6933                                         /* Not Acked yet */
6934                                         break;
6935                                 }
6936                         }
6937                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6938                         if (chk->data) {
6939                                 sctp_m_freem(chk->data);
6940                                 chk->data = NULL;
6941                         }
6942                         asoc->ctrl_queue_cnt--;
6943                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6944                 }
6945         }
6946 }
6947
6948
6949 static void
6950 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6951     struct sctp_association *asoc,
6952     struct sctp_tmit_chunk **data_list,
6953     int bundle_at,
6954     struct sctp_nets *net)
6955 {
6956         int i;
6957         struct sctp_tmit_chunk *tp1;
6958
6959         for (i = 0; i < bundle_at; i++) {
6960                 /* off of the send queue */
6961                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6962                 asoc->send_queue_cnt--;
6963                 if (i > 0) {
6964                         /*
6965                          * Any chunk NOT 0 you zap the time chunk 0 gets
6966                          * zapped or set based on if a RTO measurment is
6967                          * needed.
6968                          */
6969                         data_list[i]->do_rtt = 0;
6970                 }
6971                 /* record time */
6972                 data_list[i]->sent_rcv_time = net->last_sent_time;
6973                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6974                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6975                 if (data_list[i]->whoTo == NULL) {
6976                         data_list[i]->whoTo = net;
6977                         atomic_add_int(&net->ref_count, 1);
6978                 }
6979                 /* on to the sent queue */
6980                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6981                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6982                         struct sctp_tmit_chunk *tpp;
6983
6984                         /* need to move back */
6985         back_up_more:
6986                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6987                         if (tpp == NULL) {
6988                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6989                                 goto all_done;
6990                         }
6991                         tp1 = tpp;
6992                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6993                                 goto back_up_more;
6994                         }
6995                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6996                 } else {
6997                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6998                             data_list[i],
6999                             sctp_next);
7000                 }
7001 all_done:
7002                 /* This does not lower until the cum-ack passes it */
7003                 asoc->sent_queue_cnt++;
7004                 if ((asoc->peers_rwnd <= 0) &&
7005                     (asoc->total_flight == 0) &&
7006                     (bundle_at == 1)) {
7007                         /* Mark the chunk as being a window probe */
7008                         SCTP_STAT_INCR(sctps_windowprobed);
7009                 }
7010 #ifdef SCTP_AUDITING_ENABLED
7011                 sctp_audit_log(0xC2, 3);
7012 #endif
7013                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7014                 data_list[i]->snd_count = 1;
7015                 data_list[i]->rec.data.chunk_was_revoked = 0;
7016                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7017                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7018                             data_list[i]->whoTo->flight_size,
7019                             data_list[i]->book_size,
7020                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7021                             data_list[i]->rec.data.tsn);
7022                 }
7023                 sctp_flight_size_increase(data_list[i]);
7024                 sctp_total_flight_increase(stcb, data_list[i]);
7025                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7026                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7027                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7028                 }
7029                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7030                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7031                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7032                         /* SWS sender side engages */
7033                         asoc->peers_rwnd = 0;
7034                 }
7035         }
7036         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7037                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7038         }
7039 }
7040
7041 static void
7042 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7043 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7044     SCTP_UNUSED
7045 #endif
7046 )
7047 {
7048         struct sctp_tmit_chunk *chk, *nchk;
7049
7050         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7051                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7052                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7053                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7054                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7055                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7056                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7057                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7058                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7059                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7060                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7062                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7063                         /* Stray chunks must be cleaned up */
7064         clean_up_anyway:
7065                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7066                         if (chk->data) {
7067                                 sctp_m_freem(chk->data);
7068                                 chk->data = NULL;
7069                         }
7070                         asoc->ctrl_queue_cnt--;
7071                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7072                                 asoc->fwd_tsn_cnt--;
7073                         sctp_free_a_chunk(stcb, chk, so_locked);
7074                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7075                         /* special handling, we must look into the param */
7076                         if (chk != asoc->str_reset) {
7077                                 goto clean_up_anyway;
7078                         }
7079                 }
7080         }
7081 }
7082
7083 static uint32_t
7084 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7085     uint32_t space_left, uint32_t frag_point, int eeor_on)
7086 {
7087         /*
7088          * Make a decision on if I should split a msg into multiple parts.
7089          * This is only asked of incomplete messages.
7090          */
7091         if (eeor_on) {
7092                 /*
7093                  * If we are doing EEOR we need to always send it if its the
7094                  * entire thing, since it might be all the guy is putting in
7095                  * the hopper.
7096                  */
7097                 if (space_left >= length) {
7098                         /*-
7099                          * If we have data outstanding,
7100                          * we get another chance when the sack
7101                          * arrives to transmit - wait for more data
7102                          */
7103                         if (stcb->asoc.total_flight == 0) {
7104                                 /*
7105                                  * If nothing is in flight, we zero the
7106                                  * packet counter.
7107                                  */
7108                                 return (length);
7109                         }
7110                         return (0);
7111
7112                 } else {
7113                         /* You can fill the rest */
7114                         return (space_left);
7115                 }
7116         }
7117         /*-
7118          * For those strange folk that make the send buffer
7119          * smaller than our fragmentation point, we can't
7120          * get a full msg in so we have to allow splitting.
7121          */
7122         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7123                 return (length);
7124         }
7125         if ((length <= space_left) ||
7126             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7127                 /* Sub-optimial residual don't split in non-eeor mode. */
7128                 return (0);
7129         }
7130         /*
7131          * If we reach here length is larger than the space_left. Do we wish
7132          * to split it for the sake of packet putting together?
7133          */
7134         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7135                 /* Its ok to split it */
7136                 return (min(space_left, frag_point));
7137         }
7138         /* Nope, can't split */
7139         return (0);
7140 }
7141
7142 static uint32_t
7143 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7144     struct sctp_stream_out *strq,
7145     uint32_t space_left,
7146     uint32_t frag_point,
7147     int *giveup,
7148     int eeor_mode,
7149     int *bail,
7150     int so_locked
7151 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7152     SCTP_UNUSED
7153 #endif
7154 )
7155 {
7156         /* Move from the stream to the send_queue keeping track of the total */
7157         struct sctp_association *asoc;
7158         struct sctp_stream_queue_pending *sp;
7159         struct sctp_tmit_chunk *chk;
7160         struct sctp_data_chunk *dchkh = NULL;
7161         struct sctp_idata_chunk *ndchkh = NULL;
7162         uint32_t to_move, length;
7163         int leading;
7164         uint8_t rcv_flags = 0;
7165         uint8_t some_taken;
7166         uint8_t send_lock_up = 0;
7167
7168         SCTP_TCB_LOCK_ASSERT(stcb);
7169         asoc = &stcb->asoc;
7170 one_more_time:
7171         /* sa_ignore FREED_MEMORY */
7172         sp = TAILQ_FIRST(&strq->outqueue);
7173         if (sp == NULL) {
7174                 if (send_lock_up == 0) {
7175                         SCTP_TCB_SEND_LOCK(stcb);
7176                         send_lock_up = 1;
7177                 }
7178                 sp = TAILQ_FIRST(&strq->outqueue);
7179                 if (sp) {
7180                         goto one_more_time;
7181                 }
7182                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7183                     (stcb->asoc.idata_supported == 0) &&
7184                     (strq->last_msg_incomplete)) {
7185                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7186                             strq->sid,
7187                             strq->last_msg_incomplete);
7188                         strq->last_msg_incomplete = 0;
7189                 }
7190                 to_move = 0;
7191                 if (send_lock_up) {
7192                         SCTP_TCB_SEND_UNLOCK(stcb);
7193                         send_lock_up = 0;
7194                 }
7195                 goto out_of;
7196         }
7197         if ((sp->msg_is_complete) && (sp->length == 0)) {
7198                 if (sp->sender_all_done) {
7199                         /*
7200                          * We are doing differed cleanup. Last time through
7201                          * when we took all the data the sender_all_done was
7202                          * not set.
7203                          */
7204                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7205                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7206                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7207                                     sp->sender_all_done,
7208                                     sp->length,
7209                                     sp->msg_is_complete,
7210                                     sp->put_last_out,
7211                                     send_lock_up);
7212                         }
7213                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7214                                 SCTP_TCB_SEND_LOCK(stcb);
7215                                 send_lock_up = 1;
7216                         }
7217                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7218                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7219                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7220                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7221                             (strq->chunks_on_queues == 0) &&
7222                             TAILQ_EMPTY(&strq->outqueue)) {
7223                                 stcb->asoc.trigger_reset = 1;
7224                         }
7225                         if (sp->net) {
7226                                 sctp_free_remote_addr(sp->net);
7227                                 sp->net = NULL;
7228                         }
7229                         if (sp->data) {
7230                                 sctp_m_freem(sp->data);
7231                                 sp->data = NULL;
7232                         }
7233                         sctp_free_a_strmoq(stcb, sp, so_locked);
7234                         /* we can't be locked to it */
7235                         if (send_lock_up) {
7236                                 SCTP_TCB_SEND_UNLOCK(stcb);
7237                                 send_lock_up = 0;
7238                         }
7239                         /* back to get the next msg */
7240                         goto one_more_time;
7241                 } else {
7242                         /*
7243                          * sender just finished this but still holds a
7244                          * reference
7245                          */
7246                         *giveup = 1;
7247                         to_move = 0;
7248                         goto out_of;
7249                 }
7250         } else {
7251                 /* is there some to get */
7252                 if (sp->length == 0) {
7253                         /* no */
7254                         *giveup = 1;
7255                         to_move = 0;
7256                         goto out_of;
7257                 } else if (sp->discard_rest) {
7258                         if (send_lock_up == 0) {
7259                                 SCTP_TCB_SEND_LOCK(stcb);
7260                                 send_lock_up = 1;
7261                         }
7262                         /* Whack down the size */
7263                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7264                         if ((stcb->sctp_socket != NULL) &&
7265                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7266                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7267                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7268                         }
7269                         if (sp->data) {
7270                                 sctp_m_freem(sp->data);
7271                                 sp->data = NULL;
7272                                 sp->tail_mbuf = NULL;
7273                         }
7274                         sp->length = 0;
7275                         sp->some_taken = 1;
7276                         *giveup = 1;
7277                         to_move = 0;
7278                         goto out_of;
7279                 }
7280         }
7281         some_taken = sp->some_taken;
7282 re_look:
7283         length = sp->length;
7284         if (sp->msg_is_complete) {
7285                 /* The message is complete */
7286                 to_move = min(length, frag_point);
7287                 if (to_move == length) {
7288                         /* All of it fits in the MTU */
7289                         if (sp->some_taken) {
7290                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7291                         } else {
7292                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7293                         }
7294                         sp->put_last_out = 1;
7295                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7296                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7297                         }
7298                 } else {
7299                         /* Not all of it fits, we fragment */
7300                         if (sp->some_taken == 0) {
7301                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7302                         }
7303                         sp->some_taken = 1;
7304                 }
7305         } else {
7306                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7307                 if (to_move) {
7308                         /*-
7309                          * We use a snapshot of length in case it
7310                          * is expanding during the compare.
7311                          */
7312                         uint32_t llen;
7313
7314                         llen = length;
7315                         if (to_move >= llen) {
7316                                 to_move = llen;
7317                                 if (send_lock_up == 0) {
7318                                         /*-
7319                                          * We are taking all of an incomplete msg
7320                                          * thus we need a send lock.
7321                                          */
7322                                         SCTP_TCB_SEND_LOCK(stcb);
7323                                         send_lock_up = 1;
7324                                         if (sp->msg_is_complete) {
7325                                                 /*
7326                                                  * the sender finished the
7327                                                  * msg
7328                                                  */
7329                                                 goto re_look;
7330                                         }
7331                                 }
7332                         }
7333                         if (sp->some_taken == 0) {
7334                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7335                                 sp->some_taken = 1;
7336                         }
7337                 } else {
7338                         /* Nothing to take. */
7339                         *giveup = 1;
7340                         to_move = 0;
7341                         goto out_of;
7342                 }
7343         }
7344
7345         /* If we reach here, we can copy out a chunk */
7346         sctp_alloc_a_chunk(stcb, chk);
7347         if (chk == NULL) {
7348                 /* No chunk memory */
7349                 *giveup = 1;
7350                 to_move = 0;
7351                 goto out_of;
7352         }
7353         /*
7354          * Setup for unordered if needed by looking at the user sent info
7355          * flags.
7356          */
7357         if (sp->sinfo_flags & SCTP_UNORDERED) {
7358                 rcv_flags |= SCTP_DATA_UNORDERED;
7359         }
7360         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7361             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7362                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7363         }
7364         /* clear out the chunk before setting up */
7365         memset(chk, 0, sizeof(*chk));
7366         chk->rec.data.rcv_flags = rcv_flags;
7367
7368         if (to_move >= length) {
7369                 /* we think we can steal the whole thing */
7370                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7371                         SCTP_TCB_SEND_LOCK(stcb);
7372                         send_lock_up = 1;
7373                 }
7374                 if (to_move < sp->length) {
7375                         /* bail, it changed */
7376                         goto dont_do_it;
7377                 }
7378                 chk->data = sp->data;
7379                 chk->last_mbuf = sp->tail_mbuf;
7380                 /* register the stealing */
7381                 sp->data = sp->tail_mbuf = NULL;
7382         } else {
7383                 struct mbuf *m;
7384
7385 dont_do_it:
7386                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7387                 chk->last_mbuf = NULL;
7388                 if (chk->data == NULL) {
7389                         sp->some_taken = some_taken;
7390                         sctp_free_a_chunk(stcb, chk, so_locked);
7391                         *bail = 1;
7392                         to_move = 0;
7393                         goto out_of;
7394                 }
7395 #ifdef SCTP_MBUF_LOGGING
7396                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7397                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7398                 }
7399 #endif
7400                 /* Pull off the data */
7401                 m_adj(sp->data, to_move);
7402                 /* Now lets work our way down and compact it */
7403                 m = sp->data;
7404                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7405                         sp->data = SCTP_BUF_NEXT(m);
7406                         SCTP_BUF_NEXT(m) = NULL;
7407                         if (sp->tail_mbuf == m) {
7408                                 /*-
7409                                  * Freeing tail? TSNH since
7410                                  * we supposedly were taking less
7411                                  * than the sp->length.
7412                                  */
7413 #ifdef INVARIANTS
7414                                 panic("Huh, freing tail? - TSNH");
7415 #else
7416                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7417                                 sp->tail_mbuf = sp->data = NULL;
7418                                 sp->length = 0;
7419 #endif
7420
7421                         }
7422                         sctp_m_free(m);
7423                         m = sp->data;
7424                 }
7425         }
7426         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7427                 chk->copy_by_ref = 1;
7428         } else {
7429                 chk->copy_by_ref = 0;
7430         }
7431         /*
7432          * get last_mbuf and counts of mb usage This is ugly but hopefully
7433          * its only one mbuf.
7434          */
7435         if (chk->last_mbuf == NULL) {
7436                 chk->last_mbuf = chk->data;
7437                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7438                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7439                 }
7440         }
7441         if (to_move > length) {
7442                 /*- This should not happen either
7443                  * since we always lower to_move to the size
7444                  * of sp->length if its larger.
7445                  */
7446 #ifdef INVARIANTS
7447                 panic("Huh, how can to_move be larger?");
7448 #else
7449                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7450                 sp->length = 0;
7451 #endif
7452         } else {
7453                 atomic_subtract_int(&sp->length, to_move);
7454         }
7455         if (stcb->asoc.idata_supported == 0) {
7456                 leading = sizeof(struct sctp_data_chunk);
7457         } else {
7458                 leading = sizeof(struct sctp_idata_chunk);
7459         }
7460         if (M_LEADINGSPACE(chk->data) < leading) {
7461                 /* Not enough room for a chunk header, get some */
7462                 struct mbuf *m;
7463
7464                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7465                 if (m == NULL) {
7466                         /*
7467                          * we're in trouble here. _PREPEND below will free
7468                          * all the data if there is no leading space, so we
7469                          * must put the data back and restore.
7470                          */
7471                         if (send_lock_up == 0) {
7472                                 SCTP_TCB_SEND_LOCK(stcb);
7473                                 send_lock_up = 1;
7474                         }
7475                         if (sp->data == NULL) {
7476                                 /* unsteal the data */
7477                                 sp->data = chk->data;
7478                                 sp->tail_mbuf = chk->last_mbuf;
7479                         } else {
7480                                 struct mbuf *m_tmp;
7481
7482                                 /* reassemble the data */
7483                                 m_tmp = sp->data;
7484                                 sp->data = chk->data;
7485                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7486                         }
7487                         sp->some_taken = some_taken;
7488                         atomic_add_int(&sp->length, to_move);
7489                         chk->data = NULL;
7490                         *bail = 1;
7491                         sctp_free_a_chunk(stcb, chk, so_locked);
7492                         to_move = 0;
7493                         goto out_of;
7494                 } else {
7495                         SCTP_BUF_LEN(m) = 0;
7496                         SCTP_BUF_NEXT(m) = chk->data;
7497                         chk->data = m;
7498                         M_ALIGN(chk->data, 4);
7499                 }
7500         }
7501         if (stcb->asoc.idata_supported == 0) {
7502                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7503         } else {
7504                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7505         }
7506         if (chk->data == NULL) {
7507                 /* HELP, TSNH since we assured it would not above? */
7508 #ifdef INVARIANTS
7509                 panic("prepend failes HELP?");
7510 #else
7511                 SCTP_PRINTF("prepend fails HELP?\n");
7512                 sctp_free_a_chunk(stcb, chk, so_locked);
7513 #endif
7514                 *bail = 1;
7515                 to_move = 0;
7516                 goto out_of;
7517         }
7518         if (stcb->asoc.idata_supported == 0) {
7519                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7520                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_data_chunk));
7521         } else {
7522                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7523                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_idata_chunk));
7524         }
7525         chk->book_size_scale = 0;
7526         chk->sent = SCTP_DATAGRAM_UNSENT;
7527
7528         chk->flags = 0;
7529         chk->asoc = &stcb->asoc;
7530         chk->pad_inplace = 0;
7531         chk->no_fr_allowed = 0;
7532         if (stcb->asoc.idata_supported == 0) {
7533                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7534                         /* Just use 0. The receiver ignores the values. */
7535                         chk->rec.data.mid = 0;
7536                 } else {
7537                         chk->rec.data.mid = strq->next_mid_ordered;
7538                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7539                                 strq->next_mid_ordered++;
7540                         }
7541                 }
7542         } else {
7543                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7544                         chk->rec.data.mid = strq->next_mid_unordered;
7545                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7546                                 strq->next_mid_unordered++;
7547                         }
7548                 } else {
7549                         chk->rec.data.mid = strq->next_mid_ordered;
7550                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7551                                 strq->next_mid_ordered++;
7552                         }
7553                 }
7554         }
7555         chk->rec.data.sid = sp->sid;
7556         chk->rec.data.ppid = sp->ppid;
7557         chk->rec.data.context = sp->context;
7558         chk->rec.data.doing_fast_retransmit = 0;
7559
7560         chk->rec.data.timetodrop = sp->ts;
7561         chk->flags = sp->act_flags;
7562
7563         if (sp->net) {
7564                 chk->whoTo = sp->net;
7565                 atomic_add_int(&chk->whoTo->ref_count, 1);
7566         } else
7567                 chk->whoTo = NULL;
7568
7569         if (sp->holds_key_ref) {
7570                 chk->auth_keyid = sp->auth_keyid;
7571                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7572                 chk->holds_key_ref = 1;
7573         }
7574         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7575         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7576                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7577                     (uint32_t)(uintptr_t)stcb, sp->length,
7578                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7579                     chk->rec.data.tsn);
7580         }
7581         if (stcb->asoc.idata_supported == 0) {
7582                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7583         } else {
7584                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7585         }
7586         /*
7587          * Put the rest of the things in place now. Size was done earlier in
7588          * previous loop prior to padding.
7589          */
7590
7591 #ifdef SCTP_ASOCLOG_OF_TSNS
7592         SCTP_TCB_LOCK_ASSERT(stcb);
7593         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7594                 asoc->tsn_out_at = 0;
7595                 asoc->tsn_out_wrapped = 1;
7596         }
7597         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7598         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7599         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7600         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7601         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7602         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7603         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7604         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7605         asoc->tsn_out_at++;
7606 #endif
7607         if (stcb->asoc.idata_supported == 0) {
7608                 dchkh->ch.chunk_type = SCTP_DATA;
7609                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7610                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7611                 dchkh->dp.sid = htons(strq->sid);
7612                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7613                 dchkh->dp.ppid = chk->rec.data.ppid;
7614                 dchkh->ch.chunk_length = htons(chk->send_size);
7615         } else {
7616                 ndchkh->ch.chunk_type = SCTP_IDATA;
7617                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7618                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7619                 ndchkh->dp.sid = htons(strq->sid);
7620                 ndchkh->dp.reserved = htons(0);
7621                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7622                 if (sp->fsn == 0)
7623                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7624                 else
7625                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7626                 sp->fsn++;
7627                 ndchkh->ch.chunk_length = htons(chk->send_size);
7628         }
7629         /* Now advance the chk->send_size by the actual pad needed. */
7630         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7631                 /* need a pad */
7632                 struct mbuf *lm;
7633                 int pads;
7634
7635                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7636                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7637                 if (lm != NULL) {
7638                         chk->last_mbuf = lm;
7639                         chk->pad_inplace = 1;
7640                 }
7641                 chk->send_size += pads;
7642         }
7643         if (PR_SCTP_ENABLED(chk->flags)) {
7644                 asoc->pr_sctp_cnt++;
7645         }
7646         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7647                 /* All done pull and kill the message */
7648                 if (sp->put_last_out == 0) {
7649                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7650                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7651                             sp->sender_all_done,
7652                             sp->length,
7653                             sp->msg_is_complete,
7654                             sp->put_last_out,
7655                             send_lock_up);
7656                 }
7657                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7658                         SCTP_TCB_SEND_LOCK(stcb);
7659                         send_lock_up = 1;
7660                 }
7661                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7662                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7663                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7664                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7665                     (strq->chunks_on_queues == 0) &&
7666                     TAILQ_EMPTY(&strq->outqueue)) {
7667                         stcb->asoc.trigger_reset = 1;
7668                 }
7669                 if (sp->net) {
7670                         sctp_free_remote_addr(sp->net);
7671                         sp->net = NULL;
7672                 }
7673                 if (sp->data) {
7674                         sctp_m_freem(sp->data);
7675                         sp->data = NULL;
7676                 }
7677                 sctp_free_a_strmoq(stcb, sp, so_locked);
7678         }
7679         asoc->chunks_on_out_queue++;
7680         strq->chunks_on_queues++;
7681         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7682         asoc->send_queue_cnt++;
7683 out_of:
7684         if (send_lock_up) {
7685                 SCTP_TCB_SEND_UNLOCK(stcb);
7686         }
7687         return (to_move);
7688 }
7689
7690
7691 static void
7692 sctp_fill_outqueue(struct sctp_tcb *stcb,
7693     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7694 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7695     SCTP_UNUSED
7696 #endif
7697 )
7698 {
7699         struct sctp_association *asoc;
7700         struct sctp_stream_out *strq;
7701         uint32_t space_left, moved, total_moved;
7702         int bail, giveup;
7703
7704         SCTP_TCB_LOCK_ASSERT(stcb);
7705         asoc = &stcb->asoc;
7706         total_moved = 0;
7707         switch (net->ro._l_addr.sa.sa_family) {
7708 #ifdef INET
7709         case AF_INET:
7710                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7711                 break;
7712 #endif
7713 #ifdef INET6
7714         case AF_INET6:
7715                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7716                 break;
7717 #endif
7718         default:
7719                 /* TSNH */
7720                 space_left = net->mtu;
7721                 break;
7722         }
7723         /* Need an allowance for the data chunk header too */
7724         if (stcb->asoc.idata_supported == 0) {
7725                 space_left -= sizeof(struct sctp_data_chunk);
7726         } else {
7727                 space_left -= sizeof(struct sctp_idata_chunk);
7728         }
7729
7730         /* must make even word boundary */
7731         space_left &= 0xfffffffc;
7732         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7733         giveup = 0;
7734         bail = 0;
7735         while ((space_left > 0) && (strq != NULL)) {
7736                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7737                     &giveup, eeor_mode, &bail, so_locked);
7738                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7739                 if ((giveup != 0) || (bail != 0)) {
7740                         break;
7741                 }
7742                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7743                 total_moved += moved;
7744                 space_left -= moved;
7745                 if (stcb->asoc.idata_supported == 0) {
7746                         if (space_left >= sizeof(struct sctp_data_chunk)) {
7747                                 space_left -= sizeof(struct sctp_data_chunk);
7748                         } else {
7749                                 space_left = 0;
7750                         }
7751                 } else {
7752                         if (space_left >= sizeof(struct sctp_idata_chunk)) {
7753                                 space_left -= sizeof(struct sctp_idata_chunk);
7754                         } else {
7755                                 space_left = 0;
7756                         }
7757                 }
7758                 space_left &= 0xfffffffc;
7759         }
7760         if (bail != 0)
7761                 *quit_now = 1;
7762
7763         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7764
7765         if (total_moved == 0) {
7766                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7767                     (net == stcb->asoc.primary_destination)) {
7768                         /* ran dry for primary network net */
7769                         SCTP_STAT_INCR(sctps_primary_randry);
7770                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7771                         /* ran dry with CMT on */
7772                         SCTP_STAT_INCR(sctps_cmt_randry);
7773                 }
7774         }
7775 }
7776
7777 void
7778 sctp_fix_ecn_echo(struct sctp_association *asoc)
7779 {
7780         struct sctp_tmit_chunk *chk;
7781
7782         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7783                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7784                         chk->sent = SCTP_DATAGRAM_UNSENT;
7785                 }
7786         }
7787 }
7788
7789 void
7790 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7791 {
7792         struct sctp_association *asoc;
7793         struct sctp_tmit_chunk *chk;
7794         struct sctp_stream_queue_pending *sp;
7795         unsigned int i;
7796
7797         if (net == NULL) {
7798                 return;
7799         }
7800         asoc = &stcb->asoc;
7801         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7802                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7803                         if (sp->net == net) {
7804                                 sctp_free_remote_addr(sp->net);
7805                                 sp->net = NULL;
7806                         }
7807                 }
7808         }
7809         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7810                 if (chk->whoTo == net) {
7811                         sctp_free_remote_addr(chk->whoTo);
7812                         chk->whoTo = NULL;
7813                 }
7814         }
7815 }
7816
7817 int
7818 sctp_med_chunk_output(struct sctp_inpcb *inp,
7819     struct sctp_tcb *stcb,
7820     struct sctp_association *asoc,
7821     int *num_out,
7822     int *reason_code,
7823     int control_only, int from_where,
7824     struct timeval *now, int *now_filled, int frag_point, int so_locked
7825 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7826     SCTP_UNUSED
7827 #endif
7828 )
7829 {
7830         /**
7831          * Ok this is the generic chunk service queue. we must do the
7832          * following:
7833          * - Service the stream queue that is next, moving any
7834          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7835          *   LAST to the out queue in one pass) and assigning TSN's. This
7836          *   only applys though if the peer does not support NDATA. For NDATA
7837          *   chunks its ok to not send the entire message ;-)
7838          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7839          *   fomulate and send the low level chunks. Making sure to combine
7840          *   any control in the control chunk queue also.
7841          */
7842         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7843         struct mbuf *outchain, *endoutchain;
7844         struct sctp_tmit_chunk *chk, *nchk;
7845
7846         /* temp arrays for unlinking */
7847         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7848         int no_fragmentflg, error;
7849         unsigned int max_rwnd_per_dest, max_send_per_dest;
7850         int one_chunk, hbflag, skip_data_for_this_net;
7851         int asconf, cookie, no_out_cnt;
7852         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7853         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7854         int tsns_sent = 0;
7855         uint32_t auth_offset = 0;
7856         struct sctp_auth_chunk *auth = NULL;
7857         uint16_t auth_keyid;
7858         int override_ok = 1;
7859         int skip_fill_up = 0;
7860         int data_auth_reqd = 0;
7861
7862         /*
7863          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7864          * destination.
7865          */
7866         int quit_now = 0;
7867
7868         *num_out = 0;
7869         *reason_code = 0;
7870         auth_keyid = stcb->asoc.authinfo.active_keyid;
7871         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7872             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7873             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7874                 eeor_mode = 1;
7875         } else {
7876                 eeor_mode = 0;
7877         }
7878         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7879         /*
7880          * First lets prime the pump. For each destination, if there is room
7881          * in the flight size, attempt to pull an MTU's worth out of the
7882          * stream queues into the general send_queue
7883          */
7884 #ifdef SCTP_AUDITING_ENABLED
7885         sctp_audit_log(0xC2, 2);
7886 #endif
7887         SCTP_TCB_LOCK_ASSERT(stcb);
7888         hbflag = 0;
7889         if (control_only)
7890                 no_data_chunks = 1;
7891         else
7892                 no_data_chunks = 0;
7893
7894         /* Nothing to possible to send? */
7895         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7896             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7897             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7898             TAILQ_EMPTY(&asoc->send_queue) &&
7899             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7900 nothing_to_send:
7901                 *reason_code = 9;
7902                 return (0);
7903         }
7904         if (asoc->peers_rwnd == 0) {
7905                 /* No room in peers rwnd */
7906                 *reason_code = 1;
7907                 if (asoc->total_flight > 0) {
7908                         /* we are allowed one chunk in flight */
7909                         no_data_chunks = 1;
7910                 }
7911         }
7912         if (stcb->asoc.ecn_echo_cnt_onq) {
7913                 /* Record where a sack goes, if any */
7914                 if (no_data_chunks &&
7915                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7916                         /* Nothing but ECNe to send - we don't do that */
7917                         goto nothing_to_send;
7918                 }
7919                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7920                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7921                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7922                                 sack_goes_to = chk->whoTo;
7923                                 break;
7924                         }
7925                 }
7926         }
7927         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7928         if (stcb->sctp_socket)
7929                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7930         else
7931                 max_send_per_dest = 0;
7932         if (no_data_chunks == 0) {
7933                 /* How many non-directed chunks are there? */
7934                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7935                         if (chk->whoTo == NULL) {
7936                                 /*
7937                                  * We already have non-directed chunks on
7938                                  * the queue, no need to do a fill-up.
7939                                  */
7940                                 skip_fill_up = 1;
7941                                 break;
7942                         }
7943                 }
7944
7945         }
7946         if ((no_data_chunks == 0) &&
7947             (skip_fill_up == 0) &&
7948             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7949                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7950                         /*
7951                          * This for loop we are in takes in each net, if
7952                          * its's got space in cwnd and has data sent to it
7953                          * (when CMT is off) then it calls
7954                          * sctp_fill_outqueue for the net. This gets data on
7955                          * the send queue for that network.
7956                          *
7957                          * In sctp_fill_outqueue TSN's are assigned and data
7958                          * is copied out of the stream buffers. Note mostly
7959                          * copy by reference (we hope).
7960                          */
7961                         net->window_probe = 0;
7962                         if ((net != stcb->asoc.alternate) &&
7963                             ((net->dest_state & SCTP_ADDR_PF) ||
7964                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7965                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7966                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7967                                         sctp_log_cwnd(stcb, net, 1,
7968                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7969                                 }
7970                                 continue;
7971                         }
7972                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7973                             (net->flight_size == 0)) {
7974                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7975                         }
7976                         if (net->flight_size >= net->cwnd) {
7977                                 /* skip this network, no room - can't fill */
7978                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7979                                         sctp_log_cwnd(stcb, net, 3,
7980                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7981                                 }
7982                                 continue;
7983                         }
7984                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7985                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7986                         }
7987                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7988                         if (quit_now) {
7989                                 /* memory alloc failure */
7990                                 no_data_chunks = 1;
7991                                 break;
7992                         }
7993                 }
7994         }
7995         /* now service each destination and send out what we can for it */
7996         /* Nothing to send? */
7997         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7998             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7999             TAILQ_EMPTY(&asoc->send_queue)) {
8000                 *reason_code = 8;
8001                 return (0);
8002         }
8003         if (asoc->sctp_cmt_on_off > 0) {
8004                 /* get the last start point */
8005                 start_at = asoc->last_net_cmt_send_started;
8006                 if (start_at == NULL) {
8007                         /* null so to beginning */
8008                         start_at = TAILQ_FIRST(&asoc->nets);
8009                 } else {
8010                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8011                         if (start_at == NULL) {
8012                                 start_at = TAILQ_FIRST(&asoc->nets);
8013                         }
8014                 }
8015                 asoc->last_net_cmt_send_started = start_at;
8016         } else {
8017                 start_at = TAILQ_FIRST(&asoc->nets);
8018         }
8019         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8020                 if (chk->whoTo == NULL) {
8021                         if (asoc->alternate) {
8022                                 chk->whoTo = asoc->alternate;
8023                         } else {
8024                                 chk->whoTo = asoc->primary_destination;
8025                         }
8026                         atomic_add_int(&chk->whoTo->ref_count, 1);
8027                 }
8028         }
8029         old_start_at = NULL;
8030 again_one_more_time:
8031         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8032                 /* how much can we send? */
8033                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8034                 if (old_start_at && (old_start_at == net)) {
8035                         /* through list ocmpletely. */
8036                         break;
8037                 }
8038                 tsns_sent = 0xa;
8039                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8040                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8041                     (net->flight_size >= net->cwnd)) {
8042                         /*
8043                          * Nothing on control or asconf and flight is full,
8044                          * we can skip even in the CMT case.
8045                          */
8046                         continue;
8047                 }
8048                 bundle_at = 0;
8049                 endoutchain = outchain = NULL;
8050                 no_fragmentflg = 1;
8051                 one_chunk = 0;
8052                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8053                         skip_data_for_this_net = 1;
8054                 } else {
8055                         skip_data_for_this_net = 0;
8056                 }
8057                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8058 #ifdef INET
8059                 case AF_INET:
8060                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8061                         break;
8062 #endif
8063 #ifdef INET6
8064                 case AF_INET6:
8065                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8066                         break;
8067 #endif
8068                 default:
8069                         /* TSNH */
8070                         mtu = net->mtu;
8071                         break;
8072                 }
8073                 mx_mtu = mtu;
8074                 to_out = 0;
8075                 if (mtu > asoc->peers_rwnd) {
8076                         if (asoc->total_flight > 0) {
8077                                 /* We have a packet in flight somewhere */
8078                                 r_mtu = asoc->peers_rwnd;
8079                         } else {
8080                                 /* We are always allowed to send one MTU out */
8081                                 one_chunk = 1;
8082                                 r_mtu = mtu;
8083                         }
8084                 } else {
8085                         r_mtu = mtu;
8086                 }
8087                 error = 0;
8088                 /************************/
8089                 /* ASCONF transmission */
8090                 /************************/
8091                 /* Now first lets go through the asconf queue */
8092                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8093                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8094                                 continue;
8095                         }
8096                         if (chk->whoTo == NULL) {
8097                                 if (asoc->alternate == NULL) {
8098                                         if (asoc->primary_destination != net) {
8099                                                 break;
8100                                         }
8101                                 } else {
8102                                         if (asoc->alternate != net) {
8103                                                 break;
8104                                         }
8105                                 }
8106                         } else {
8107                                 if (chk->whoTo != net) {
8108                                         break;
8109                                 }
8110                         }
8111                         if (chk->data == NULL) {
8112                                 break;
8113                         }
8114                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8115                             chk->sent != SCTP_DATAGRAM_RESEND) {
8116                                 break;
8117                         }
8118                         /*
8119                          * if no AUTH is yet included and this chunk
8120                          * requires it, make sure to account for it.  We
8121                          * don't apply the size until the AUTH chunk is
8122                          * actually added below in case there is no room for
8123                          * this chunk. NOTE: we overload the use of "omtu"
8124                          * here
8125                          */
8126                         if ((auth == NULL) &&
8127                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8128                             stcb->asoc.peer_auth_chunks)) {
8129                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8130                         } else
8131                                 omtu = 0;
8132                         /* Here we do NOT factor the r_mtu */
8133                         if ((chk->send_size < (int)(mtu - omtu)) ||
8134                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8135                                 /*
8136                                  * We probably should glom the mbuf chain
8137                                  * from the chk->data for control but the
8138                                  * problem is it becomes yet one more level
8139                                  * of tracking to do if for some reason
8140                                  * output fails. Then I have got to
8141                                  * reconstruct the merged control chain.. el
8142                                  * yucko.. for now we take the easy way and
8143                                  * do the copy
8144                                  */
8145                                 /*
8146                                  * Add an AUTH chunk, if chunk requires it
8147                                  * save the offset into the chain for AUTH
8148                                  */
8149                                 if ((auth == NULL) &&
8150                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8151                                     stcb->asoc.peer_auth_chunks))) {
8152                                         outchain = sctp_add_auth_chunk(outchain,
8153                                             &endoutchain,
8154                                             &auth,
8155                                             &auth_offset,
8156                                             stcb,
8157                                             chk->rec.chunk_id.id);
8158                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8159                                 }
8160                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8161                                     (int)chk->rec.chunk_id.can_take_data,
8162                                     chk->send_size, chk->copy_by_ref);
8163                                 if (outchain == NULL) {
8164                                         *reason_code = 8;
8165                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8166                                         return (ENOMEM);
8167                                 }
8168                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8169                                 /* update our MTU size */
8170                                 if (mtu > (chk->send_size + omtu))
8171                                         mtu -= (chk->send_size + omtu);
8172                                 else
8173                                         mtu = 0;
8174                                 to_out += (chk->send_size + omtu);
8175                                 /* Do clear IP_DF ? */
8176                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8177                                         no_fragmentflg = 0;
8178                                 }
8179                                 if (chk->rec.chunk_id.can_take_data)
8180                                         chk->data = NULL;
8181                                 /*
8182                                  * set hb flag since we can use these for
8183                                  * RTO
8184                                  */
8185                                 hbflag = 1;
8186                                 asconf = 1;
8187                                 /*
8188                                  * should sysctl this: don't bundle data
8189                                  * with ASCONF since it requires AUTH
8190                                  */
8191                                 no_data_chunks = 1;
8192                                 chk->sent = SCTP_DATAGRAM_SENT;
8193                                 if (chk->whoTo == NULL) {
8194                                         chk->whoTo = net;
8195                                         atomic_add_int(&net->ref_count, 1);
8196                                 }
8197                                 chk->snd_count++;
8198                                 if (mtu == 0) {
8199                                         /*
8200                                          * Ok we are out of room but we can
8201                                          * output without effecting the
8202                                          * flight size since this little guy
8203                                          * is a control only packet.
8204                                          */
8205                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8206                                         /*
8207                                          * do NOT clear the asconf flag as
8208                                          * it is used to do appropriate
8209                                          * source address selection.
8210                                          */
8211                                         if (*now_filled == 0) {
8212                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8213                                                 *now_filled = 1;
8214                                         }
8215                                         net->last_sent_time = *now;
8216                                         hbflag = 0;
8217                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8218                                             (struct sockaddr *)&net->ro._l_addr,
8219                                             outchain, auth_offset, auth,
8220                                             stcb->asoc.authinfo.active_keyid,
8221                                             no_fragmentflg, 0, asconf,
8222                                             inp->sctp_lport, stcb->rport,
8223                                             htonl(stcb->asoc.peer_vtag),
8224                                             net->port, NULL,
8225                                             0, 0,
8226                                             so_locked))) {
8227                                                 /*
8228                                                  * error, we could not
8229                                                  * output
8230                                                  */
8231                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8232                                                 if (from_where == 0) {
8233                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8234                                                 }
8235                                                 if (error == ENOBUFS) {
8236                                                         asoc->ifp_had_enobuf = 1;
8237                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8238                                                 }
8239                                                 /* error, could not output */
8240                                                 if (error == EHOSTUNREACH) {
8241                                                         /*
8242                                                          * Destination went
8243                                                          * unreachable
8244                                                          * during this send
8245                                                          */
8246                                                         sctp_move_chunks_from_net(stcb, net);
8247                                                 }
8248                                                 *reason_code = 7;
8249                                                 break;
8250                                         } else {
8251                                                 asoc->ifp_had_enobuf = 0;
8252                                         }
8253                                         /*
8254                                          * increase the number we sent, if a
8255                                          * cookie is sent we don't tell them
8256                                          * any was sent out.
8257                                          */
8258                                         outchain = endoutchain = NULL;
8259                                         auth = NULL;
8260                                         auth_offset = 0;
8261                                         if (!no_out_cnt)
8262                                                 *num_out += ctl_cnt;
8263                                         /* recalc a clean slate and setup */
8264                                         switch (net->ro._l_addr.sa.sa_family) {
8265 #ifdef INET
8266                                         case AF_INET:
8267                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8268                                                 break;
8269 #endif
8270 #ifdef INET6
8271                                         case AF_INET6:
8272                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8273                                                 break;
8274 #endif
8275                                         default:
8276                                                 /* TSNH */
8277                                                 mtu = net->mtu;
8278                                                 break;
8279                                         }
8280                                         to_out = 0;
8281                                         no_fragmentflg = 1;
8282                                 }
8283                         }
8284                 }
8285                 if (error != 0) {
8286                         /* try next net */
8287                         continue;
8288                 }
8289                 /************************/
8290                 /* Control transmission */
8291                 /************************/
8292                 /* Now first lets go through the control queue */
8293                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8294                         if ((sack_goes_to) &&
8295                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8296                             (chk->whoTo != sack_goes_to)) {
8297                                 /*
8298                                  * if we have a sack in queue, and we are
8299                                  * looking at an ecn echo that is NOT queued
8300                                  * to where the sack is going..
8301                                  */
8302                                 if (chk->whoTo == net) {
8303                                         /*
8304                                          * Don't transmit it to where its
8305                                          * going (current net)
8306                                          */
8307                                         continue;
8308                                 } else if (sack_goes_to == net) {
8309                                         /*
8310                                          * But do transmit it to this
8311                                          * address
8312                                          */
8313                                         goto skip_net_check;
8314                                 }
8315                         }
8316                         if (chk->whoTo == NULL) {
8317                                 if (asoc->alternate == NULL) {
8318                                         if (asoc->primary_destination != net) {
8319                                                 continue;
8320                                         }
8321                                 } else {
8322                                         if (asoc->alternate != net) {
8323                                                 continue;
8324                                         }
8325                                 }
8326                         } else {
8327                                 if (chk->whoTo != net) {
8328                                         continue;
8329                                 }
8330                         }
8331         skip_net_check:
8332                         if (chk->data == NULL) {
8333                                 continue;
8334                         }
8335                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8336                                 /*
8337                                  * It must be unsent. Cookies and ASCONF's
8338                                  * hang around but there timers will force
8339                                  * when marked for resend.
8340                                  */
8341                                 continue;
8342                         }
8343                         /*
8344                          * if no AUTH is yet included and this chunk
8345                          * requires it, make sure to account for it.  We
8346                          * don't apply the size until the AUTH chunk is
8347                          * actually added below in case there is no room for
8348                          * this chunk. NOTE: we overload the use of "omtu"
8349                          * here
8350                          */
8351                         if ((auth == NULL) &&
8352                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8353                             stcb->asoc.peer_auth_chunks)) {
8354                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8355                         } else
8356                                 omtu = 0;
8357                         /* Here we do NOT factor the r_mtu */
8358                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8359                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8360                                 /*
8361                                  * We probably should glom the mbuf chain
8362                                  * from the chk->data for control but the
8363                                  * problem is it becomes yet one more level
8364                                  * of tracking to do if for some reason
8365                                  * output fails. Then I have got to
8366                                  * reconstruct the merged control chain.. el
8367                                  * yucko.. for now we take the easy way and
8368                                  * do the copy
8369                                  */
8370                                 /*
8371                                  * Add an AUTH chunk, if chunk requires it
8372                                  * save the offset into the chain for AUTH
8373                                  */
8374                                 if ((auth == NULL) &&
8375                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8376                                     stcb->asoc.peer_auth_chunks))) {
8377                                         outchain = sctp_add_auth_chunk(outchain,
8378                                             &endoutchain,
8379                                             &auth,
8380                                             &auth_offset,
8381                                             stcb,
8382                                             chk->rec.chunk_id.id);
8383                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8384                                 }
8385                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8386                                     (int)chk->rec.chunk_id.can_take_data,
8387                                     chk->send_size, chk->copy_by_ref);
8388                                 if (outchain == NULL) {
8389                                         *reason_code = 8;
8390                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8391                                         return (ENOMEM);
8392                                 }
8393                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8394                                 /* update our MTU size */
8395                                 if (mtu > (chk->send_size + omtu))
8396                                         mtu -= (chk->send_size + omtu);
8397                                 else
8398                                         mtu = 0;
8399                                 to_out += (chk->send_size + omtu);
8400                                 /* Do clear IP_DF ? */
8401                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8402                                         no_fragmentflg = 0;
8403                                 }
8404                                 if (chk->rec.chunk_id.can_take_data)
8405                                         chk->data = NULL;
8406                                 /* Mark things to be removed, if needed */
8407                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8408                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8409                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8410                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8411                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8412                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8413                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8414                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8415                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8416                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8417                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8418                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8419                                                 hbflag = 1;
8420                                         }
8421                                         /* remove these chunks at the end */
8422                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8423                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8424                                                 /* turn off the timer */
8425                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8426                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8427                                                             inp, stcb, net,
8428                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8429                                                 }
8430                                         }
8431                                         ctl_cnt++;
8432                                 } else {
8433                                         /*
8434                                          * Other chunks, since they have
8435                                          * timers running (i.e. COOKIE) we
8436                                          * just "trust" that it gets sent or
8437                                          * retransmitted.
8438                                          */
8439                                         ctl_cnt++;
8440                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8441                                                 cookie = 1;
8442                                                 no_out_cnt = 1;
8443                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8444                                                 /*
8445                                                  * Increment ecne send count
8446                                                  * here this means we may be
8447                                                  * over-zealous in our
8448                                                  * counting if the send
8449                                                  * fails, but its the best
8450                                                  * place to do it (we used
8451                                                  * to do it in the queue of
8452                                                  * the chunk, but that did
8453                                                  * not tell how many times
8454                                                  * it was sent.
8455                                                  */
8456                                                 SCTP_STAT_INCR(sctps_sendecne);
8457                                         }
8458                                         chk->sent = SCTP_DATAGRAM_SENT;
8459                                         if (chk->whoTo == NULL) {
8460                                                 chk->whoTo = net;
8461                                                 atomic_add_int(&net->ref_count, 1);
8462                                         }
8463                                         chk->snd_count++;
8464                                 }
8465                                 if (mtu == 0) {
8466                                         /*
8467                                          * Ok we are out of room but we can
8468                                          * output without effecting the
8469                                          * flight size since this little guy
8470                                          * is a control only packet.
8471                                          */
8472                                         if (asconf) {
8473                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8474                                                 /*
8475                                                  * do NOT clear the asconf
8476                                                  * flag as it is used to do
8477                                                  * appropriate source
8478                                                  * address selection.
8479                                                  */
8480                                         }
8481                                         if (cookie) {
8482                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8483                                                 cookie = 0;
8484                                         }
8485                                         /* Only HB or ASCONF advances time */
8486                                         if (hbflag) {
8487                                                 if (*now_filled == 0) {
8488                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8489                                                         *now_filled = 1;
8490                                                 }
8491                                                 net->last_sent_time = *now;
8492                                                 hbflag = 0;
8493                                         }
8494                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8495                                             (struct sockaddr *)&net->ro._l_addr,
8496                                             outchain,
8497                                             auth_offset, auth,
8498                                             stcb->asoc.authinfo.active_keyid,
8499                                             no_fragmentflg, 0, asconf,
8500                                             inp->sctp_lport, stcb->rport,
8501                                             htonl(stcb->asoc.peer_vtag),
8502                                             net->port, NULL,
8503                                             0, 0,
8504                                             so_locked))) {
8505                                                 /*
8506                                                  * error, we could not
8507                                                  * output
8508                                                  */
8509                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8510                                                 if (from_where == 0) {
8511                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8512                                                 }
8513                                                 if (error == ENOBUFS) {
8514                                                         asoc->ifp_had_enobuf = 1;
8515                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8516                                                 }
8517                                                 if (error == EHOSTUNREACH) {
8518                                                         /*
8519                                                          * Destination went
8520                                                          * unreachable
8521                                                          * during this send
8522                                                          */
8523                                                         sctp_move_chunks_from_net(stcb, net);
8524                                                 }
8525                                                 *reason_code = 7;
8526                                                 break;
8527                                         } else {
8528                                                 asoc->ifp_had_enobuf = 0;
8529                                         }
8530                                         /*
8531                                          * increase the number we sent, if a
8532                                          * cookie is sent we don't tell them
8533                                          * any was sent out.
8534                                          */
8535                                         outchain = endoutchain = NULL;
8536                                         auth = NULL;
8537                                         auth_offset = 0;
8538                                         if (!no_out_cnt)
8539                                                 *num_out += ctl_cnt;
8540                                         /* recalc a clean slate and setup */
8541                                         switch (net->ro._l_addr.sa.sa_family) {
8542 #ifdef INET
8543                                         case AF_INET:
8544                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8545                                                 break;
8546 #endif
8547 #ifdef INET6
8548                                         case AF_INET6:
8549                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8550                                                 break;
8551 #endif
8552                                         default:
8553                                                 /* TSNH */
8554                                                 mtu = net->mtu;
8555                                                 break;
8556                                         }
8557                                         to_out = 0;
8558                                         no_fragmentflg = 1;
8559                                 }
8560                         }
8561                 }
8562                 if (error != 0) {
8563                         /* try next net */
8564                         continue;
8565                 }
8566                 /* JRI: if dest is in PF state, do not send data to it */
8567                 if ((asoc->sctp_cmt_on_off > 0) &&
8568                     (net != stcb->asoc.alternate) &&
8569                     (net->dest_state & SCTP_ADDR_PF)) {
8570                         goto no_data_fill;
8571                 }
8572                 if (net->flight_size >= net->cwnd) {
8573                         goto no_data_fill;
8574                 }
8575                 if ((asoc->sctp_cmt_on_off > 0) &&
8576                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8577                     (net->flight_size > max_rwnd_per_dest)) {
8578                         goto no_data_fill;
8579                 }
8580                 /*
8581                  * We need a specific accounting for the usage of the send
8582                  * buffer. We also need to check the number of messages per
8583                  * net. For now, this is better than nothing and it disabled
8584                  * by default...
8585                  */
8586                 if ((asoc->sctp_cmt_on_off > 0) &&
8587                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8588                     (max_send_per_dest > 0) &&
8589                     (net->flight_size > max_send_per_dest)) {
8590                         goto no_data_fill;
8591                 }
8592                 /*********************/
8593                 /* Data transmission */
8594                 /*********************/
8595                 /*
8596                  * if AUTH for DATA is required and no AUTH has been added
8597                  * yet, account for this in the mtu now... if no data can be
8598                  * bundled, this adjustment won't matter anyways since the
8599                  * packet will be going out...
8600                  */
8601                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8602                     stcb->asoc.peer_auth_chunks);
8603                 if (data_auth_reqd && (auth == NULL)) {
8604                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8605                 }
8606                 /* now lets add any data within the MTU constraints */
8607                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8608 #ifdef INET
8609                 case AF_INET:
8610                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8611                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8612                         else
8613                                 omtu = 0;
8614                         break;
8615 #endif
8616 #ifdef INET6
8617                 case AF_INET6:
8618                         if (net->mtu > SCTP_MIN_OVERHEAD)
8619                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8620                         else
8621                                 omtu = 0;
8622                         break;
8623 #endif
8624                 default:
8625                         /* TSNH */
8626                         omtu = 0;
8627                         break;
8628                 }
8629                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8630                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8631                     (skip_data_for_this_net == 0)) ||
8632                     (cookie)) {
8633                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8634                                 if (no_data_chunks) {
8635                                         /* let only control go out */
8636                                         *reason_code = 1;
8637                                         break;
8638                                 }
8639                                 if (net->flight_size >= net->cwnd) {
8640                                         /* skip this net, no room for data */
8641                                         *reason_code = 2;
8642                                         break;
8643                                 }
8644                                 if ((chk->whoTo != NULL) &&
8645                                     (chk->whoTo != net)) {
8646                                         /* Don't send the chunk on this net */
8647                                         continue;
8648                                 }
8649                                 if (asoc->sctp_cmt_on_off == 0) {
8650                                         if ((asoc->alternate) &&
8651                                             (asoc->alternate != net) &&
8652                                             (chk->whoTo == NULL)) {
8653                                                 continue;
8654                                         } else if ((net != asoc->primary_destination) &&
8655                                                     (asoc->alternate == NULL) &&
8656                                             (chk->whoTo == NULL)) {
8657                                                 continue;
8658                                         }
8659                                 }
8660                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8661                                         /*-
8662                                          * strange, we have a chunk that is
8663                                          * to big for its destination and
8664                                          * yet no fragment ok flag.
8665                                          * Something went wrong when the
8666                                          * PMTU changed...we did not mark
8667                                          * this chunk for some reason?? I
8668                                          * will fix it here by letting IP
8669                                          * fragment it for now and printing
8670                                          * a warning. This really should not
8671                                          * happen ...
8672                                          */
8673                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8674                                             chk->send_size, mtu);
8675                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8676                                 }
8677                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8678                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8679                                         struct sctp_data_chunk *dchkh;
8680
8681                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8682                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8683                                 }
8684                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8685                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8686                                         /* ok we will add this one */
8687
8688                                         /*
8689                                          * Add an AUTH chunk, if chunk
8690                                          * requires it, save the offset into
8691                                          * the chain for AUTH
8692                                          */
8693                                         if (data_auth_reqd) {
8694                                                 if (auth == NULL) {
8695                                                         outchain = sctp_add_auth_chunk(outchain,
8696                                                             &endoutchain,
8697                                                             &auth,
8698                                                             &auth_offset,
8699                                                             stcb,
8700                                                             SCTP_DATA);
8701                                                         auth_keyid = chk->auth_keyid;
8702                                                         override_ok = 0;
8703                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8704                                                 } else if (override_ok) {
8705                                                         /*
8706                                                          * use this data's
8707                                                          * keyid
8708                                                          */
8709                                                         auth_keyid = chk->auth_keyid;
8710                                                         override_ok = 0;
8711                                                 } else if (auth_keyid != chk->auth_keyid) {
8712                                                         /*
8713                                                          * different keyid,
8714                                                          * so done bundling
8715                                                          */
8716                                                         break;
8717                                                 }
8718                                         }
8719                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8720                                             chk->send_size, chk->copy_by_ref);
8721                                         if (outchain == NULL) {
8722                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8723                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8724                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8725                                                 }
8726                                                 *reason_code = 3;
8727                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8728                                                 return (ENOMEM);
8729                                         }
8730                                         /* upate our MTU size */
8731                                         /* Do clear IP_DF ? */
8732                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8733                                                 no_fragmentflg = 0;
8734                                         }
8735                                         /* unsigned subtraction of mtu */
8736                                         if (mtu > chk->send_size)
8737                                                 mtu -= chk->send_size;
8738                                         else
8739                                                 mtu = 0;
8740                                         /* unsigned subtraction of r_mtu */
8741                                         if (r_mtu > chk->send_size)
8742                                                 r_mtu -= chk->send_size;
8743                                         else
8744                                                 r_mtu = 0;
8745
8746                                         to_out += chk->send_size;
8747                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8748 #ifdef INVARIANTS
8749                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8750 #else
8751                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8752                                                     mx_mtu, to_out);
8753 #endif
8754                                         }
8755                                         chk->window_probe = 0;
8756                                         data_list[bundle_at++] = chk;
8757                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8758                                                 break;
8759                                         }
8760                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8761                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8762                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8763                                                 } else {
8764                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8765                                                 }
8766                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8767                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8768                                                         /*
8769                                                          * Count number of
8770                                                          * user msg's that
8771                                                          * were fragmented
8772                                                          * we do this by
8773                                                          * counting when we
8774                                                          * see a LAST
8775                                                          * fragment only.
8776                                                          */
8777                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8778                                         }
8779                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8780                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8781                                                         data_list[0]->window_probe = 1;
8782                                                         net->window_probe = 1;
8783                                                 }
8784                                                 break;
8785                                         }
8786                                 } else {
8787                                         /*
8788                                          * Must be sent in order of the
8789                                          * TSN's (on a network)
8790                                          */
8791                                         break;
8792                                 }
8793                         }       /* for (chunk gather loop for this net) */
8794                 }               /* if asoc.state OPEN */
8795 no_data_fill:
8796                 /* Is there something to send for this destination? */
8797                 if (outchain) {
8798                         /* We may need to start a control timer or two */
8799                         if (asconf) {
8800                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8801                                     stcb, net);
8802                                 /*
8803                                  * do NOT clear the asconf flag as it is
8804                                  * used to do appropriate source address
8805                                  * selection.
8806                                  */
8807                         }
8808                         if (cookie) {
8809                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8810                                 cookie = 0;
8811                         }
8812                         /* must start a send timer if data is being sent */
8813                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8814                                 /*
8815                                  * no timer running on this destination
8816                                  * restart it.
8817                                  */
8818                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8819                         }
8820                         if (bundle_at || hbflag) {
8821                                 /* For data/asconf and hb set time */
8822                                 if (*now_filled == 0) {
8823                                         (void)SCTP_GETTIME_TIMEVAL(now);
8824                                         *now_filled = 1;
8825                                 }
8826                                 net->last_sent_time = *now;
8827                         }
8828                         /* Now send it, if there is anything to send :> */
8829                         if ((error = sctp_lowlevel_chunk_output(inp,
8830                             stcb,
8831                             net,
8832                             (struct sockaddr *)&net->ro._l_addr,
8833                             outchain,
8834                             auth_offset,
8835                             auth,
8836                             auth_keyid,
8837                             no_fragmentflg,
8838                             bundle_at,
8839                             asconf,
8840                             inp->sctp_lport, stcb->rport,
8841                             htonl(stcb->asoc.peer_vtag),
8842                             net->port, NULL,
8843                             0, 0,
8844                             so_locked))) {
8845                                 /* error, we could not output */
8846                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8847                                 if (from_where == 0) {
8848                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8849                                 }
8850                                 if (error == ENOBUFS) {
8851                                         asoc->ifp_had_enobuf = 1;
8852                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8853                                 }
8854                                 if (error == EHOSTUNREACH) {
8855                                         /*
8856                                          * Destination went unreachable
8857                                          * during this send
8858                                          */
8859                                         sctp_move_chunks_from_net(stcb, net);
8860                                 }
8861                                 *reason_code = 6;
8862                                 /*-
8863                                  * I add this line to be paranoid. As far as
8864                                  * I can tell the continue, takes us back to
8865                                  * the top of the for, but just to make sure
8866                                  * I will reset these again here.
8867                                  */
8868                                 ctl_cnt = bundle_at = 0;
8869                                 continue;       /* This takes us back to the
8870                                                  * for() for the nets. */
8871                         } else {
8872                                 asoc->ifp_had_enobuf = 0;
8873                         }
8874                         endoutchain = NULL;
8875                         auth = NULL;
8876                         auth_offset = 0;
8877                         if (!no_out_cnt) {
8878                                 *num_out += (ctl_cnt + bundle_at);
8879                         }
8880                         if (bundle_at) {
8881                                 /* setup for a RTO measurement */
8882                                 tsns_sent = data_list[0]->rec.data.tsn;
8883                                 /* fill time if not already filled */
8884                                 if (*now_filled == 0) {
8885                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8886                                         *now_filled = 1;
8887                                         *now = asoc->time_last_sent;
8888                                 } else {
8889                                         asoc->time_last_sent = *now;
8890                                 }
8891                                 if (net->rto_needed) {
8892                                         data_list[0]->do_rtt = 1;
8893                                         net->rto_needed = 0;
8894                                 }
8895                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8896                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8897                         }
8898                         if (one_chunk) {
8899                                 break;
8900                         }
8901                 }
8902                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8903                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8904                 }
8905         }
8906         if (old_start_at == NULL) {
8907                 old_start_at = start_at;
8908                 start_at = TAILQ_FIRST(&asoc->nets);
8909                 if (old_start_at)
8910                         goto again_one_more_time;
8911         }
8912         /*
8913          * At the end there should be no NON timed chunks hanging on this
8914          * queue.
8915          */
8916         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8917                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8918         }
8919         if ((*num_out == 0) && (*reason_code == 0)) {
8920                 *reason_code = 4;
8921         } else {
8922                 *reason_code = 5;
8923         }
8924         sctp_clean_up_ctl(stcb, asoc, so_locked);
8925         return (0);
8926 }
8927
8928 void
8929 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8930 {
8931         /*-
8932          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8933          * the control chunk queue.
8934          */
8935         struct sctp_chunkhdr *hdr;
8936         struct sctp_tmit_chunk *chk;
8937         struct mbuf *mat, *last_mbuf;
8938         uint32_t chunk_length;
8939         uint16_t padding_length;
8940
8941         SCTP_TCB_LOCK_ASSERT(stcb);
8942         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8943         if (op_err == NULL) {
8944                 return;
8945         }
8946         last_mbuf = NULL;
8947         chunk_length = 0;
8948         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8949                 chunk_length += SCTP_BUF_LEN(mat);
8950                 if (SCTP_BUF_NEXT(mat) == NULL) {
8951                         last_mbuf = mat;
8952                 }
8953         }
8954         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8955                 sctp_m_freem(op_err);
8956                 return;
8957         }
8958         padding_length = chunk_length % 4;
8959         if (padding_length != 0) {
8960                 padding_length = 4 - padding_length;
8961         }
8962         if (padding_length != 0) {
8963                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8964                         sctp_m_freem(op_err);
8965                         return;
8966                 }
8967         }
8968         sctp_alloc_a_chunk(stcb, chk);
8969         if (chk == NULL) {
8970                 /* no memory */
8971                 sctp_m_freem(op_err);
8972                 return;
8973         }
8974         chk->copy_by_ref = 0;
8975         chk->send_size = (uint16_t)chunk_length;
8976         chk->sent = SCTP_DATAGRAM_UNSENT;
8977         chk->snd_count = 0;
8978         chk->asoc = &stcb->asoc;
8979         chk->data = op_err;
8980         chk->whoTo = NULL;
8981         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8982         chk->rec.chunk_id.can_take_data = 0;
8983         hdr = mtod(op_err, struct sctp_chunkhdr *);
8984         hdr->chunk_type = SCTP_OPERATION_ERROR;
8985         hdr->chunk_flags = 0;
8986         hdr->chunk_length = htons(chk->send_size);
8987         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8988         chk->asoc->ctrl_queue_cnt++;
8989 }
8990
8991 int
8992 sctp_send_cookie_echo(struct mbuf *m,
8993     int offset,
8994     struct sctp_tcb *stcb,
8995     struct sctp_nets *net)
8996 {
8997         /*-
8998          * pull out the cookie and put it at the front of the control chunk
8999          * queue.
9000          */
9001         int at;
9002         struct mbuf *cookie;
9003         struct sctp_paramhdr parm, *phdr;
9004         struct sctp_chunkhdr *hdr;
9005         struct sctp_tmit_chunk *chk;
9006         uint16_t ptype, plen;
9007
9008         SCTP_TCB_LOCK_ASSERT(stcb);
9009         /* First find the cookie in the param area */
9010         cookie = NULL;
9011         at = offset + sizeof(struct sctp_init_chunk);
9012         for (;;) {
9013                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
9014                 if (phdr == NULL) {
9015                         return (-3);
9016                 }
9017                 ptype = ntohs(phdr->param_type);
9018                 plen = ntohs(phdr->param_length);
9019                 if (ptype == SCTP_STATE_COOKIE) {
9020                         int pad;
9021
9022                         /* found the cookie */
9023                         if ((pad = (plen % 4))) {
9024                                 plen += 4 - pad;
9025                         }
9026                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9027                         if (cookie == NULL) {
9028                                 /* No memory */
9029                                 return (-2);
9030                         }
9031 #ifdef SCTP_MBUF_LOGGING
9032                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9033                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9034                         }
9035 #endif
9036                         break;
9037                 }
9038                 at += SCTP_SIZE32(plen);
9039         }
9040         /* ok, we got the cookie lets change it into a cookie echo chunk */
9041         /* first the change from param to cookie */
9042         hdr = mtod(cookie, struct sctp_chunkhdr *);
9043         hdr->chunk_type = SCTP_COOKIE_ECHO;
9044         hdr->chunk_flags = 0;
9045         /* get the chunk stuff now and place it in the FRONT of the queue */
9046         sctp_alloc_a_chunk(stcb, chk);
9047         if (chk == NULL) {
9048                 /* no memory */
9049                 sctp_m_freem(cookie);
9050                 return (-5);
9051         }
9052         chk->copy_by_ref = 0;
9053         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9054         chk->rec.chunk_id.can_take_data = 0;
9055         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9056         chk->send_size = plen;
9057         chk->sent = SCTP_DATAGRAM_UNSENT;
9058         chk->snd_count = 0;
9059         chk->asoc = &stcb->asoc;
9060         chk->data = cookie;
9061         chk->whoTo = net;
9062         atomic_add_int(&chk->whoTo->ref_count, 1);
9063         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9064         chk->asoc->ctrl_queue_cnt++;
9065         return (0);
9066 }
9067
9068 void
9069 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9070     struct mbuf *m,
9071     int offset,
9072     int chk_length,
9073     struct sctp_nets *net)
9074 {
9075         /*
9076          * take a HB request and make it into a HB ack and send it.
9077          */
9078         struct mbuf *outchain;
9079         struct sctp_chunkhdr *chdr;
9080         struct sctp_tmit_chunk *chk;
9081
9082
9083         if (net == NULL)
9084                 /* must have a net pointer */
9085                 return;
9086
9087         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9088         if (outchain == NULL) {
9089                 /* gak out of memory */
9090                 return;
9091         }
9092 #ifdef SCTP_MBUF_LOGGING
9093         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9094                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9095         }
9096 #endif
9097         chdr = mtod(outchain, struct sctp_chunkhdr *);
9098         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9099         chdr->chunk_flags = 0;
9100         if (chk_length % 4) {
9101                 /* need pad */
9102                 uint32_t cpthis = 0;
9103                 int padlen;
9104
9105                 padlen = 4 - (chk_length % 4);
9106                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9107         }
9108         sctp_alloc_a_chunk(stcb, chk);
9109         if (chk == NULL) {
9110                 /* no memory */
9111                 sctp_m_freem(outchain);
9112                 return;
9113         }
9114         chk->copy_by_ref = 0;
9115         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9116         chk->rec.chunk_id.can_take_data = 1;
9117         chk->flags = 0;
9118         chk->send_size = chk_length;
9119         chk->sent = SCTP_DATAGRAM_UNSENT;
9120         chk->snd_count = 0;
9121         chk->asoc = &stcb->asoc;
9122         chk->data = outchain;
9123         chk->whoTo = net;
9124         atomic_add_int(&chk->whoTo->ref_count, 1);
9125         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9126         chk->asoc->ctrl_queue_cnt++;
9127 }
9128
9129 void
9130 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9131 {
9132         /* formulate and queue a cookie-ack back to sender */
9133         struct mbuf *cookie_ack;
9134         struct sctp_chunkhdr *hdr;
9135         struct sctp_tmit_chunk *chk;
9136
9137         SCTP_TCB_LOCK_ASSERT(stcb);
9138
9139         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9140         if (cookie_ack == NULL) {
9141                 /* no mbuf's */
9142                 return;
9143         }
9144         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9145         sctp_alloc_a_chunk(stcb, chk);
9146         if (chk == NULL) {
9147                 /* no memory */
9148                 sctp_m_freem(cookie_ack);
9149                 return;
9150         }
9151         chk->copy_by_ref = 0;
9152         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9153         chk->rec.chunk_id.can_take_data = 1;
9154         chk->flags = 0;
9155         chk->send_size = sizeof(struct sctp_chunkhdr);
9156         chk->sent = SCTP_DATAGRAM_UNSENT;
9157         chk->snd_count = 0;
9158         chk->asoc = &stcb->asoc;
9159         chk->data = cookie_ack;
9160         if (chk->asoc->last_control_chunk_from != NULL) {
9161                 chk->whoTo = chk->asoc->last_control_chunk_from;
9162                 atomic_add_int(&chk->whoTo->ref_count, 1);
9163         } else {
9164                 chk->whoTo = NULL;
9165         }
9166         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9167         hdr->chunk_type = SCTP_COOKIE_ACK;
9168         hdr->chunk_flags = 0;
9169         hdr->chunk_length = htons(chk->send_size);
9170         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9171         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9172         chk->asoc->ctrl_queue_cnt++;
9173         return;
9174 }
9175
9176
9177 void
9178 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9179 {
9180         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9181         struct mbuf *m_shutdown_ack;
9182         struct sctp_shutdown_ack_chunk *ack_cp;
9183         struct sctp_tmit_chunk *chk;
9184
9185         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9186         if (m_shutdown_ack == NULL) {
9187                 /* no mbuf's */
9188                 return;
9189         }
9190         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9191         sctp_alloc_a_chunk(stcb, chk);
9192         if (chk == NULL) {
9193                 /* no memory */
9194                 sctp_m_freem(m_shutdown_ack);
9195                 return;
9196         }
9197         chk->copy_by_ref = 0;
9198         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9199         chk->rec.chunk_id.can_take_data = 1;
9200         chk->flags = 0;
9201         chk->send_size = sizeof(struct sctp_chunkhdr);
9202         chk->sent = SCTP_DATAGRAM_UNSENT;
9203         chk->snd_count = 0;
9204         chk->flags = 0;
9205         chk->asoc = &stcb->asoc;
9206         chk->data = m_shutdown_ack;
9207         chk->whoTo = net;
9208         if (chk->whoTo) {
9209                 atomic_add_int(&chk->whoTo->ref_count, 1);
9210         }
9211         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9212         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9213         ack_cp->ch.chunk_flags = 0;
9214         ack_cp->ch.chunk_length = htons(chk->send_size);
9215         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9216         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9217         chk->asoc->ctrl_queue_cnt++;
9218         return;
9219 }
9220
9221 void
9222 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9223 {
9224         /* formulate and queue a SHUTDOWN to the sender */
9225         struct mbuf *m_shutdown;
9226         struct sctp_shutdown_chunk *shutdown_cp;
9227         struct sctp_tmit_chunk *chk;
9228
9229         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9230                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9231                         /* We already have a SHUTDOWN queued. Reuse it. */
9232                         if (chk->whoTo) {
9233                                 sctp_free_remote_addr(chk->whoTo);
9234                                 chk->whoTo = NULL;
9235                         }
9236                         break;
9237                 }
9238         }
9239         if (chk == NULL) {
9240                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9241                 if (m_shutdown == NULL) {
9242                         /* no mbuf's */
9243                         return;
9244                 }
9245                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9246                 sctp_alloc_a_chunk(stcb, chk);
9247                 if (chk == NULL) {
9248                         /* no memory */
9249                         sctp_m_freem(m_shutdown);
9250                         return;
9251                 }
9252                 chk->copy_by_ref = 0;
9253                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9254                 chk->rec.chunk_id.can_take_data = 1;
9255                 chk->flags = 0;
9256                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9257                 chk->sent = SCTP_DATAGRAM_UNSENT;
9258                 chk->snd_count = 0;
9259                 chk->flags = 0;
9260                 chk->asoc = &stcb->asoc;
9261                 chk->data = m_shutdown;
9262                 chk->whoTo = net;
9263                 if (chk->whoTo) {
9264                         atomic_add_int(&chk->whoTo->ref_count, 1);
9265                 }
9266                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9267                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9268                 shutdown_cp->ch.chunk_flags = 0;
9269                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9270                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9271                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9272                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9273                 chk->asoc->ctrl_queue_cnt++;
9274         } else {
9275                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9276                 chk->whoTo = net;
9277                 if (chk->whoTo) {
9278                         atomic_add_int(&chk->whoTo->ref_count, 1);
9279                 }
9280                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9281                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9282                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9283         }
9284         return;
9285 }
9286
9287 void
9288 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9289 {
9290         /*
9291          * formulate and queue an ASCONF to the peer. ASCONF parameters
9292          * should be queued on the assoc queue.
9293          */
9294         struct sctp_tmit_chunk *chk;
9295         struct mbuf *m_asconf;
9296         int len;
9297
9298         SCTP_TCB_LOCK_ASSERT(stcb);
9299
9300         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9301             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9302                 /* can't send a new one if there is one in flight already */
9303                 return;
9304         }
9305         /* compose an ASCONF chunk, maximum length is PMTU */
9306         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9307         if (m_asconf == NULL) {
9308                 return;
9309         }
9310         sctp_alloc_a_chunk(stcb, chk);
9311         if (chk == NULL) {
9312                 /* no memory */
9313                 sctp_m_freem(m_asconf);
9314                 return;
9315         }
9316         chk->copy_by_ref = 0;
9317         chk->rec.chunk_id.id = SCTP_ASCONF;
9318         chk->rec.chunk_id.can_take_data = 0;
9319         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9320         chk->data = m_asconf;
9321         chk->send_size = len;
9322         chk->sent = SCTP_DATAGRAM_UNSENT;
9323         chk->snd_count = 0;
9324         chk->asoc = &stcb->asoc;
9325         chk->whoTo = net;
9326         if (chk->whoTo) {
9327                 atomic_add_int(&chk->whoTo->ref_count, 1);
9328         }
9329         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9330         chk->asoc->ctrl_queue_cnt++;
9331         return;
9332 }
9333
9334 void
9335 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9336 {
9337         /*
9338          * formulate and queue a asconf-ack back to sender. the asconf-ack
9339          * must be stored in the tcb.
9340          */
9341         struct sctp_tmit_chunk *chk;
9342         struct sctp_asconf_ack *ack, *latest_ack;
9343         struct mbuf *m_ack;
9344         struct sctp_nets *net = NULL;
9345
9346         SCTP_TCB_LOCK_ASSERT(stcb);
9347         /* Get the latest ASCONF-ACK */
9348         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9349         if (latest_ack == NULL) {
9350                 return;
9351         }
9352         if (latest_ack->last_sent_to != NULL &&
9353             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9354                 /* we're doing a retransmission */
9355                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9356                 if (net == NULL) {
9357                         /* no alternate */
9358                         if (stcb->asoc.last_control_chunk_from == NULL) {
9359                                 if (stcb->asoc.alternate) {
9360                                         net = stcb->asoc.alternate;
9361                                 } else {
9362                                         net = stcb->asoc.primary_destination;
9363                                 }
9364                         } else {
9365                                 net = stcb->asoc.last_control_chunk_from;
9366                         }
9367                 }
9368         } else {
9369                 /* normal case */
9370                 if (stcb->asoc.last_control_chunk_from == NULL) {
9371                         if (stcb->asoc.alternate) {
9372                                 net = stcb->asoc.alternate;
9373                         } else {
9374                                 net = stcb->asoc.primary_destination;
9375                         }
9376                 } else {
9377                         net = stcb->asoc.last_control_chunk_from;
9378                 }
9379         }
9380         latest_ack->last_sent_to = net;
9381
9382         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9383                 if (ack->data == NULL) {
9384                         continue;
9385                 }
9386                 /* copy the asconf_ack */
9387                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9388                 if (m_ack == NULL) {
9389                         /* couldn't copy it */
9390                         return;
9391                 }
9392 #ifdef SCTP_MBUF_LOGGING
9393                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9394                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9395                 }
9396 #endif
9397
9398                 sctp_alloc_a_chunk(stcb, chk);
9399                 if (chk == NULL) {
9400                         /* no memory */
9401                         if (m_ack)
9402                                 sctp_m_freem(m_ack);
9403                         return;
9404                 }
9405                 chk->copy_by_ref = 0;
9406                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9407                 chk->rec.chunk_id.can_take_data = 1;
9408                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9409                 chk->whoTo = net;
9410                 if (chk->whoTo) {
9411                         atomic_add_int(&chk->whoTo->ref_count, 1);
9412                 }
9413                 chk->data = m_ack;
9414                 chk->send_size = ack->len;
9415                 chk->sent = SCTP_DATAGRAM_UNSENT;
9416                 chk->snd_count = 0;
9417                 chk->asoc = &stcb->asoc;
9418
9419                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9420                 chk->asoc->ctrl_queue_cnt++;
9421         }
9422         return;
9423 }
9424
9425
9426 static int
9427 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9428     struct sctp_tcb *stcb,
9429     struct sctp_association *asoc,
9430     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9431 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9432     SCTP_UNUSED
9433 #endif
9434 )
9435 {
9436         /*-
9437          * send out one MTU of retransmission. If fast_retransmit is
9438          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9439          * rwnd. For a Cookie or Asconf in the control chunk queue we
9440          * retransmit them by themselves.
9441          *
9442          * For data chunks we will pick out the lowest TSN's in the sent_queue
9443          * marked for resend and bundle them all together (up to a MTU of
9444          * destination). The address to send to should have been
9445          * selected/changed where the retransmission was marked (i.e. in FR
9446          * or t3-timeout routines).
9447          */
9448         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9449         struct sctp_tmit_chunk *chk, *fwd;
9450         struct mbuf *m, *endofchain;
9451         struct sctp_nets *net = NULL;
9452         uint32_t tsns_sent = 0;
9453         int no_fragmentflg, bundle_at, cnt_thru;
9454         unsigned int mtu;
9455         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9456         struct sctp_auth_chunk *auth = NULL;
9457         uint32_t auth_offset = 0;
9458         uint16_t auth_keyid;
9459         int override_ok = 1;
9460         int data_auth_reqd = 0;
9461         uint32_t dmtu = 0;
9462
9463         SCTP_TCB_LOCK_ASSERT(stcb);
9464         tmr_started = ctl_cnt = bundle_at = error = 0;
9465         no_fragmentflg = 1;
9466         fwd_tsn = 0;
9467         *cnt_out = 0;
9468         fwd = NULL;
9469         endofchain = m = NULL;
9470         auth_keyid = stcb->asoc.authinfo.active_keyid;
9471 #ifdef SCTP_AUDITING_ENABLED
9472         sctp_audit_log(0xC3, 1);
9473 #endif
9474         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9475             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9476                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9477                     asoc->sent_queue_retran_cnt);
9478                 asoc->sent_queue_cnt = 0;
9479                 asoc->sent_queue_cnt_removeable = 0;
9480                 /* send back 0/0 so we enter normal transmission */
9481                 *cnt_out = 0;
9482                 return (0);
9483         }
9484         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9485                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9486                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9487                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9488                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9489                                 continue;
9490                         }
9491                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9492                                 if (chk != asoc->str_reset) {
9493                                         /*
9494                                          * not eligible for retran if its
9495                                          * not ours
9496                                          */
9497                                         continue;
9498                                 }
9499                         }
9500                         ctl_cnt++;
9501                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9502                                 fwd_tsn = 1;
9503                         }
9504                         /*
9505                          * Add an AUTH chunk, if chunk requires it save the
9506                          * offset into the chain for AUTH
9507                          */
9508                         if ((auth == NULL) &&
9509                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9510                             stcb->asoc.peer_auth_chunks))) {
9511                                 m = sctp_add_auth_chunk(m, &endofchain,
9512                                     &auth, &auth_offset,
9513                                     stcb,
9514                                     chk->rec.chunk_id.id);
9515                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9516                         }
9517                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9518                         break;
9519                 }
9520         }
9521         one_chunk = 0;
9522         cnt_thru = 0;
9523         /* do we have control chunks to retransmit? */
9524         if (m != NULL) {
9525                 /* Start a timer no matter if we succeed or fail */
9526                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9527                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9528                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9529                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9530                 chk->snd_count++;       /* update our count */
9531                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9532                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9533                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9534                     no_fragmentflg, 0, 0,
9535                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9536                     chk->whoTo->port, NULL,
9537                     0, 0,
9538                     so_locked))) {
9539                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9540                         if (error == ENOBUFS) {
9541                                 asoc->ifp_had_enobuf = 1;
9542                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9543                         }
9544                         return (error);
9545                 } else {
9546                         asoc->ifp_had_enobuf = 0;
9547                 }
9548                 endofchain = NULL;
9549                 auth = NULL;
9550                 auth_offset = 0;
9551                 /*
9552                  * We don't want to mark the net->sent time here since this
9553                  * we use this for HB and retrans cannot measure RTT
9554                  */
9555                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9556                 *cnt_out += 1;
9557                 chk->sent = SCTP_DATAGRAM_SENT;
9558                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9559                 if (fwd_tsn == 0) {
9560                         return (0);
9561                 } else {
9562                         /* Clean up the fwd-tsn list */
9563                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9564                         return (0);
9565                 }
9566         }
9567         /*
9568          * Ok, it is just data retransmission we need to do or that and a
9569          * fwd-tsn with it all.
9570          */
9571         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9572                 return (SCTP_RETRAN_DONE);
9573         }
9574         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9575             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9576                 /* not yet open, resend the cookie and that is it */
9577                 return (1);
9578         }
9579 #ifdef SCTP_AUDITING_ENABLED
9580         sctp_auditing(20, inp, stcb, NULL);
9581 #endif
9582         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9583         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9584                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9585                         /* No, not sent to this net or not ready for rtx */
9586                         continue;
9587                 }
9588                 if (chk->data == NULL) {
9589                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9590                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9591                         continue;
9592                 }
9593                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9594                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9595                         struct mbuf *op_err;
9596                         char msg[SCTP_DIAG_INFO_LEN];
9597
9598                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9599                             chk->rec.data.tsn, chk->snd_count);
9600                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9601                             msg);
9602                         atomic_add_int(&stcb->asoc.refcnt, 1);
9603                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9604                             so_locked);
9605                         SCTP_TCB_LOCK(stcb);
9606                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9607                         return (SCTP_RETRAN_EXIT);
9608                 }
9609                 /* pick up the net */
9610                 net = chk->whoTo;
9611                 switch (net->ro._l_addr.sa.sa_family) {
9612 #ifdef INET
9613                 case AF_INET:
9614                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9615                         break;
9616 #endif
9617 #ifdef INET6
9618                 case AF_INET6:
9619                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9620                         break;
9621 #endif
9622                 default:
9623                         /* TSNH */
9624                         mtu = net->mtu;
9625                         break;
9626                 }
9627
9628                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9629                         /* No room in peers rwnd */
9630                         uint32_t tsn;
9631
9632                         tsn = asoc->last_acked_seq + 1;
9633                         if (tsn == chk->rec.data.tsn) {
9634                                 /*
9635                                  * we make a special exception for this
9636                                  * case. The peer has no rwnd but is missing
9637                                  * the lowest chunk.. which is probably what
9638                                  * is holding up the rwnd.
9639                                  */
9640                                 goto one_chunk_around;
9641                         }
9642                         return (1);
9643                 }
9644 one_chunk_around:
9645                 if (asoc->peers_rwnd < mtu) {
9646                         one_chunk = 1;
9647                         if ((asoc->peers_rwnd == 0) &&
9648                             (asoc->total_flight == 0)) {
9649                                 chk->window_probe = 1;
9650                                 chk->whoTo->window_probe = 1;
9651                         }
9652                 }
9653 #ifdef SCTP_AUDITING_ENABLED
9654                 sctp_audit_log(0xC3, 2);
9655 #endif
9656                 bundle_at = 0;
9657                 m = NULL;
9658                 net->fast_retran_ip = 0;
9659                 if (chk->rec.data.doing_fast_retransmit == 0) {
9660                         /*
9661                          * if no FR in progress skip destination that have
9662                          * flight_size > cwnd.
9663                          */
9664                         if (net->flight_size >= net->cwnd) {
9665                                 continue;
9666                         }
9667                 } else {
9668                         /*
9669                          * Mark the destination net to have FR recovery
9670                          * limits put on it.
9671                          */
9672                         *fr_done = 1;
9673                         net->fast_retran_ip = 1;
9674                 }
9675
9676                 /*
9677                  * if no AUTH is yet included and this chunk requires it,
9678                  * make sure to account for it.  We don't apply the size
9679                  * until the AUTH chunk is actually added below in case
9680                  * there is no room for this chunk.
9681                  */
9682                 if (data_auth_reqd && (auth == NULL)) {
9683                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9684                 } else
9685                         dmtu = 0;
9686
9687                 if ((chk->send_size <= (mtu - dmtu)) ||
9688                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9689                         /* ok we will add this one */
9690                         if (data_auth_reqd) {
9691                                 if (auth == NULL) {
9692                                         m = sctp_add_auth_chunk(m,
9693                                             &endofchain,
9694                                             &auth,
9695                                             &auth_offset,
9696                                             stcb,
9697                                             SCTP_DATA);
9698                                         auth_keyid = chk->auth_keyid;
9699                                         override_ok = 0;
9700                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9701                                 } else if (override_ok) {
9702                                         auth_keyid = chk->auth_keyid;
9703                                         override_ok = 0;
9704                                 } else if (chk->auth_keyid != auth_keyid) {
9705                                         /* different keyid, so done bundling */
9706                                         break;
9707                                 }
9708                         }
9709                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9710                         if (m == NULL) {
9711                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9712                                 return (ENOMEM);
9713                         }
9714                         /* Do clear IP_DF ? */
9715                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9716                                 no_fragmentflg = 0;
9717                         }
9718                         /* upate our MTU size */
9719                         if (mtu > (chk->send_size + dmtu))
9720                                 mtu -= (chk->send_size + dmtu);
9721                         else
9722                                 mtu = 0;
9723                         data_list[bundle_at++] = chk;
9724                         if (one_chunk && (asoc->total_flight <= 0)) {
9725                                 SCTP_STAT_INCR(sctps_windowprobed);
9726                         }
9727                 }
9728                 if (one_chunk == 0) {
9729                         /*
9730                          * now are there anymore forward from chk to pick
9731                          * up?
9732                          */
9733                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9734                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9735                                         /* Nope, not for retran */
9736                                         continue;
9737                                 }
9738                                 if (fwd->whoTo != net) {
9739                                         /* Nope, not the net in question */
9740                                         continue;
9741                                 }
9742                                 if (data_auth_reqd && (auth == NULL)) {
9743                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9744                                 } else
9745                                         dmtu = 0;
9746                                 if (fwd->send_size <= (mtu - dmtu)) {
9747                                         if (data_auth_reqd) {
9748                                                 if (auth == NULL) {
9749                                                         m = sctp_add_auth_chunk(m,
9750                                                             &endofchain,
9751                                                             &auth,
9752                                                             &auth_offset,
9753                                                             stcb,
9754                                                             SCTP_DATA);
9755                                                         auth_keyid = fwd->auth_keyid;
9756                                                         override_ok = 0;
9757                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9758                                                 } else if (override_ok) {
9759                                                         auth_keyid = fwd->auth_keyid;
9760                                                         override_ok = 0;
9761                                                 } else if (fwd->auth_keyid != auth_keyid) {
9762                                                         /*
9763                                                          * different keyid,
9764                                                          * so done bundling
9765                                                          */
9766                                                         break;
9767                                                 }
9768                                         }
9769                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9770                                         if (m == NULL) {
9771                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9772                                                 return (ENOMEM);
9773                                         }
9774                                         /* Do clear IP_DF ? */
9775                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9776                                                 no_fragmentflg = 0;
9777                                         }
9778                                         /* upate our MTU size */
9779                                         if (mtu > (fwd->send_size + dmtu))
9780                                                 mtu -= (fwd->send_size + dmtu);
9781                                         else
9782                                                 mtu = 0;
9783                                         data_list[bundle_at++] = fwd;
9784                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9785                                                 break;
9786                                         }
9787                                 } else {
9788                                         /* can't fit so we are done */
9789                                         break;
9790                                 }
9791                         }
9792                 }
9793                 /* Is there something to send for this destination? */
9794                 if (m) {
9795                         /*
9796                          * No matter if we fail/or succeed we should start a
9797                          * timer. A failure is like a lost IP packet :-)
9798                          */
9799                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9800                                 /*
9801                                  * no timer running on this destination
9802                                  * restart it.
9803                                  */
9804                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9805                                 tmr_started = 1;
9806                         }
9807                         /* Now lets send it, if there is anything to send :> */
9808                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9809                             (struct sockaddr *)&net->ro._l_addr, m,
9810                             auth_offset, auth, auth_keyid,
9811                             no_fragmentflg, 0, 0,
9812                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9813                             net->port, NULL,
9814                             0, 0,
9815                             so_locked))) {
9816                                 /* error, we could not output */
9817                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9818                                 if (error == ENOBUFS) {
9819                                         asoc->ifp_had_enobuf = 1;
9820                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9821                                 }
9822                                 return (error);
9823                         } else {
9824                                 asoc->ifp_had_enobuf = 0;
9825                         }
9826                         endofchain = NULL;
9827                         auth = NULL;
9828                         auth_offset = 0;
9829                         /* For HB's */
9830                         /*
9831                          * We don't want to mark the net->sent time here
9832                          * since this we use this for HB and retrans cannot
9833                          * measure RTT
9834                          */
9835                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9836
9837                         /* For auto-close */
9838                         cnt_thru++;
9839                         if (*now_filled == 0) {
9840                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9841                                 *now = asoc->time_last_sent;
9842                                 *now_filled = 1;
9843                         } else {
9844                                 asoc->time_last_sent = *now;
9845                         }
9846                         *cnt_out += bundle_at;
9847 #ifdef SCTP_AUDITING_ENABLED
9848                         sctp_audit_log(0xC4, bundle_at);
9849 #endif
9850                         if (bundle_at) {
9851                                 tsns_sent = data_list[0]->rec.data.tsn;
9852                         }
9853                         for (i = 0; i < bundle_at; i++) {
9854                                 SCTP_STAT_INCR(sctps_sendretransdata);
9855                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9856                                 /*
9857                                  * When we have a revoked data, and we
9858                                  * retransmit it, then we clear the revoked
9859                                  * flag since this flag dictates if we
9860                                  * subtracted from the fs
9861                                  */
9862                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9863                                         /* Deflate the cwnd */
9864                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9865                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9866                                 }
9867                                 data_list[i]->snd_count++;
9868                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9869                                 /* record the time */
9870                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9871                                 if (data_list[i]->book_size_scale) {
9872                                         /*
9873                                          * need to double the book size on
9874                                          * this one
9875                                          */
9876                                         data_list[i]->book_size_scale = 0;
9877                                         /*
9878                                          * Since we double the booksize, we
9879                                          * must also double the output queue
9880                                          * size, since this get shrunk when
9881                                          * we free by this amount.
9882                                          */
9883                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9884                                         data_list[i]->book_size *= 2;
9885
9886
9887                                 } else {
9888                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9889                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9890                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9891                                         }
9892                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9893                                             (uint32_t)(data_list[i]->send_size +
9894                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9895                                 }
9896                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9897                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9898                                             data_list[i]->whoTo->flight_size,
9899                                             data_list[i]->book_size,
9900                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9901                                             data_list[i]->rec.data.tsn);
9902                                 }
9903                                 sctp_flight_size_increase(data_list[i]);
9904                                 sctp_total_flight_increase(stcb, data_list[i]);
9905                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9906                                         /* SWS sender side engages */
9907                                         asoc->peers_rwnd = 0;
9908                                 }
9909                                 if ((i == 0) &&
9910                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9911                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9912                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9913                                             (tmr_started == 0)) {
9914                                                 /*-
9915                                                  * ok we just fast-retrans'd
9916                                                  * the lowest TSN, i.e the
9917                                                  * first on the list. In
9918                                                  * this case we want to give
9919                                                  * some more time to get a
9920                                                  * SACK back without a
9921                                                  * t3-expiring.
9922                                                  */
9923                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9924                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9925                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9926                                         }
9927                                 }
9928                         }
9929                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9930                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9931                         }
9932 #ifdef SCTP_AUDITING_ENABLED
9933                         sctp_auditing(21, inp, stcb, NULL);
9934 #endif
9935                 } else {
9936                         /* None will fit */
9937                         return (1);
9938                 }
9939                 if (asoc->sent_queue_retran_cnt <= 0) {
9940                         /* all done we have no more to retran */
9941                         asoc->sent_queue_retran_cnt = 0;
9942                         break;
9943                 }
9944                 if (one_chunk) {
9945                         /* No more room in rwnd */
9946                         return (1);
9947                 }
9948                 /* stop the for loop here. we sent out a packet */
9949                 break;
9950         }
9951         return (0);
9952 }
9953
9954 static void
9955 sctp_timer_validation(struct sctp_inpcb *inp,
9956     struct sctp_tcb *stcb,
9957     struct sctp_association *asoc)
9958 {
9959         struct sctp_nets *net;
9960
9961         /* Validate that a timer is running somewhere */
9962         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9963                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9964                         /* Here is a timer */
9965                         return;
9966                 }
9967         }
9968         SCTP_TCB_LOCK_ASSERT(stcb);
9969         /* Gak, we did not have a timer somewhere */
9970         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9971         if (asoc->alternate) {
9972                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9973         } else {
9974                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9975         }
9976         return;
9977 }
9978
9979 void
9980 sctp_chunk_output(struct sctp_inpcb *inp,
9981     struct sctp_tcb *stcb,
9982     int from_where,
9983     int so_locked
9984 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9985     SCTP_UNUSED
9986 #endif
9987 )
9988 {
9989         /*-
9990          * Ok this is the generic chunk service queue. we must do the
9991          * following:
9992          * - See if there are retransmits pending, if so we must
9993          *   do these first.
9994          * - Service the stream queue that is next, moving any
9995          *   message (note I must get a complete message i.e.
9996          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9997          *   TSN's
9998          * - Check to see if the cwnd/rwnd allows any output, if so we
9999          *   go ahead and fomulate and send the low level chunks. Making sure
10000          *   to combine any control in the control chunk queue also.
10001          */
10002         struct sctp_association *asoc;
10003         struct sctp_nets *net;
10004         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10005         unsigned int burst_cnt = 0;
10006         struct timeval now;
10007         int now_filled = 0;
10008         int nagle_on;
10009         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10010         int un_sent = 0;
10011         int fr_done;
10012         unsigned int tot_frs = 0;
10013
10014         asoc = &stcb->asoc;
10015 do_it_again:
10016         /* The Nagle algorithm is only applied when handling a send call. */
10017         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10018                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10019                         nagle_on = 0;
10020                 } else {
10021                         nagle_on = 1;
10022                 }
10023         } else {
10024                 nagle_on = 0;
10025         }
10026         SCTP_TCB_LOCK_ASSERT(stcb);
10027
10028         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10029
10030         if ((un_sent <= 0) &&
10031             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10032             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10033             (asoc->sent_queue_retran_cnt == 0) &&
10034             (asoc->trigger_reset == 0)) {
10035                 /* Nothing to do unless there is something to be sent left */
10036                 return;
10037         }
10038         /*
10039          * Do we have something to send, data or control AND a sack timer
10040          * running, if so piggy-back the sack.
10041          */
10042         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10043                 sctp_send_sack(stcb, so_locked);
10044                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10045         }
10046         while (asoc->sent_queue_retran_cnt) {
10047                 /*-
10048                  * Ok, it is retransmission time only, we send out only ONE
10049                  * packet with a single call off to the retran code.
10050                  */
10051                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10052                         /*-
10053                          * Special hook for handling cookiess discarded
10054                          * by peer that carried data. Send cookie-ack only
10055                          * and then the next call with get the retran's.
10056                          */
10057                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10058                             from_where,
10059                             &now, &now_filled, frag_point, so_locked);
10060                         return;
10061                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10062                         /* if its not from a HB then do it */
10063                         fr_done = 0;
10064                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10065                         if (fr_done) {
10066                                 tot_frs++;
10067                         }
10068                 } else {
10069                         /*
10070                          * its from any other place, we don't allow retran
10071                          * output (only control)
10072                          */
10073                         ret = 1;
10074                 }
10075                 if (ret > 0) {
10076                         /* Can't send anymore */
10077                         /*-
10078                          * now lets push out control by calling med-level
10079                          * output once. this assures that we WILL send HB's
10080                          * if queued too.
10081                          */
10082                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10083                             from_where,
10084                             &now, &now_filled, frag_point, so_locked);
10085 #ifdef SCTP_AUDITING_ENABLED
10086                         sctp_auditing(8, inp, stcb, NULL);
10087 #endif
10088                         sctp_timer_validation(inp, stcb, asoc);
10089                         return;
10090                 }
10091                 if (ret < 0) {
10092                         /*-
10093                          * The count was off.. retran is not happening so do
10094                          * the normal retransmission.
10095                          */
10096 #ifdef SCTP_AUDITING_ENABLED
10097                         sctp_auditing(9, inp, stcb, NULL);
10098 #endif
10099                         if (ret == SCTP_RETRAN_EXIT) {
10100                                 return;
10101                         }
10102                         break;
10103                 }
10104                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10105                         /* Only one transmission allowed out of a timeout */
10106 #ifdef SCTP_AUDITING_ENABLED
10107                         sctp_auditing(10, inp, stcb, NULL);
10108 #endif
10109                         /* Push out any control */
10110                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10111                             &now, &now_filled, frag_point, so_locked);
10112                         return;
10113                 }
10114                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10115                         /* Hit FR burst limit */
10116                         return;
10117                 }
10118                 if ((num_out == 0) && (ret == 0)) {
10119                         /* No more retrans to send */
10120                         break;
10121                 }
10122         }
10123 #ifdef SCTP_AUDITING_ENABLED
10124         sctp_auditing(12, inp, stcb, NULL);
10125 #endif
10126         /* Check for bad destinations, if they exist move chunks around. */
10127         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10128                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10129                         /*-
10130                          * if possible move things off of this address we
10131                          * still may send below due to the dormant state but
10132                          * we try to find an alternate address to send to
10133                          * and if we have one we move all queued data on the
10134                          * out wheel to this alternate address.
10135                          */
10136                         if (net->ref_count > 1)
10137                                 sctp_move_chunks_from_net(stcb, net);
10138                 } else {
10139                         /*-
10140                          * if ((asoc->sat_network) || (net->addr_is_local))
10141                          * { burst_limit = asoc->max_burst *
10142                          * SCTP_SAT_NETWORK_BURST_INCR; }
10143                          */
10144                         if (asoc->max_burst > 0) {
10145                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10146                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10147                                                 /*
10148                                                  * JRS - Use the congestion
10149                                                  * control given in the
10150                                                  * congestion control module
10151                                                  */
10152                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10153                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10154                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10155                                                 }
10156                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10157                                         }
10158                                         net->fast_retran_ip = 0;
10159                                 } else {
10160                                         if (net->flight_size == 0) {
10161                                                 /*
10162                                                  * Should be decaying the
10163                                                  * cwnd here
10164                                                  */
10165                                                 ;
10166                                         }
10167                                 }
10168                         }
10169                 }
10170
10171         }
10172         burst_cnt = 0;
10173         do {
10174                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10175                     &reason_code, 0, from_where,
10176                     &now, &now_filled, frag_point, so_locked);
10177                 if (error) {
10178                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10179                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10180                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10181                         }
10182                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10183                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10184                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10185                         }
10186                         break;
10187                 }
10188                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10189
10190                 tot_out += num_out;
10191                 burst_cnt++;
10192                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10193                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10194                         if (num_out == 0) {
10195                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10196                         }
10197                 }
10198                 if (nagle_on) {
10199                         /*
10200                          * When the Nagle algorithm is used, look at how
10201                          * much is unsent, then if its smaller than an MTU
10202                          * and we have data in flight we stop, except if we
10203                          * are handling a fragmented user message.
10204                          */
10205                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10206                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10207                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10208                             (stcb->asoc.total_flight > 0)) {
10209 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10210                                 break;
10211                         }
10212                 }
10213                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10214                     TAILQ_EMPTY(&asoc->send_queue) &&
10215                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10216                         /* Nothing left to send */
10217                         break;
10218                 }
10219                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10220                         /* Nothing left to send */
10221                         break;
10222                 }
10223         } while (num_out &&
10224             ((asoc->max_burst == 0) ||
10225             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10226             (burst_cnt < asoc->max_burst)));
10227
10228         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10229                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10230                         SCTP_STAT_INCR(sctps_maxburstqueued);
10231                         asoc->burst_limit_applied = 1;
10232                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10233                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10234                         }
10235                 } else {
10236                         asoc->burst_limit_applied = 0;
10237                 }
10238         }
10239         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10240                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10241         }
10242         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10243             tot_out);
10244
10245         /*-
10246          * Now we need to clean up the control chunk chain if a ECNE is on
10247          * it. It must be marked as UNSENT again so next call will continue
10248          * to send it until such time that we get a CWR, to remove it.
10249          */
10250         if (stcb->asoc.ecn_echo_cnt_onq)
10251                 sctp_fix_ecn_echo(asoc);
10252
10253         if (stcb->asoc.trigger_reset) {
10254                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10255                         goto do_it_again;
10256                 }
10257         }
10258         return;
10259 }
10260
10261
10262 int
10263 sctp_output(
10264     struct sctp_inpcb *inp,
10265     struct mbuf *m,
10266     struct sockaddr *addr,
10267     struct mbuf *control,
10268     struct thread *p,
10269     int flags)
10270 {
10271         if (inp == NULL) {
10272                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10273                 return (EINVAL);
10274         }
10275         if (inp->sctp_socket == NULL) {
10276                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10277                 return (EINVAL);
10278         }
10279         return (sctp_sosend(inp->sctp_socket,
10280             addr,
10281             (struct uio *)NULL,
10282             m,
10283             control,
10284             flags, p
10285             ));
10286 }
10287
10288 void
10289 send_forward_tsn(struct sctp_tcb *stcb,
10290     struct sctp_association *asoc)
10291 {
10292         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10293         struct sctp_forward_tsn_chunk *fwdtsn;
10294         struct sctp_strseq *strseq;
10295         struct sctp_strseq_mid *strseq_m;
10296         uint32_t advance_peer_ack_point;
10297         unsigned int cnt_of_space, i, ovh;
10298         unsigned int space_needed;
10299         unsigned int cnt_of_skipped = 0;
10300
10301         SCTP_TCB_LOCK_ASSERT(stcb);
10302         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10303                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10304                         /* mark it to unsent */
10305                         chk->sent = SCTP_DATAGRAM_UNSENT;
10306                         chk->snd_count = 0;
10307                         /* Do we correct its output location? */
10308                         if (chk->whoTo) {
10309                                 sctp_free_remote_addr(chk->whoTo);
10310                                 chk->whoTo = NULL;
10311                         }
10312                         goto sctp_fill_in_rest;
10313                 }
10314         }
10315         /* Ok if we reach here we must build one */
10316         sctp_alloc_a_chunk(stcb, chk);
10317         if (chk == NULL) {
10318                 return;
10319         }
10320         asoc->fwd_tsn_cnt++;
10321         chk->copy_by_ref = 0;
10322         /*
10323          * We don't do the old thing here since this is used not for on-wire
10324          * but to tell if we are sending a fwd-tsn by the stack during
10325          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10326          */
10327         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10328         chk->rec.chunk_id.can_take_data = 0;
10329         chk->flags = 0;
10330         chk->asoc = asoc;
10331         chk->whoTo = NULL;
10332         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10333         if (chk->data == NULL) {
10334                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10335                 return;
10336         }
10337         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10338         chk->sent = SCTP_DATAGRAM_UNSENT;
10339         chk->snd_count = 0;
10340         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10341         asoc->ctrl_queue_cnt++;
10342 sctp_fill_in_rest:
10343         /*-
10344          * Here we go through and fill out the part that deals with
10345          * stream/seq of the ones we skip.
10346          */
10347         SCTP_BUF_LEN(chk->data) = 0;
10348         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10349                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10350                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10351                         /* no more to look at */
10352                         break;
10353                 }
10354                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10355                         /* We don't report these */
10356                         continue;
10357                 }
10358                 cnt_of_skipped++;
10359         }
10360         if (asoc->idata_supported) {
10361                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10362                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10363         } else {
10364                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10365                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10366         }
10367         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10368
10369         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10370                 ovh = SCTP_MIN_OVERHEAD;
10371         } else {
10372                 ovh = SCTP_MIN_V4_OVERHEAD;
10373         }
10374         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10375                 /* trim to a mtu size */
10376                 cnt_of_space = asoc->smallest_mtu - ovh;
10377         }
10378         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10379                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10380                     0xff, 0, cnt_of_skipped,
10381                     asoc->advanced_peer_ack_point);
10382         }
10383         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10384         if (cnt_of_space < space_needed) {
10385                 /*-
10386                  * ok we must trim down the chunk by lowering the
10387                  * advance peer ack point.
10388                  */
10389                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10390                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10391                             0xff, 0xff, cnt_of_space,
10392                             space_needed);
10393                 }
10394                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10395                 if (asoc->idata_supported) {
10396                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10397                 } else {
10398                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10399                 }
10400                 /*-
10401                  * Go through and find the TSN that will be the one
10402                  * we report.
10403                  */
10404                 at = TAILQ_FIRST(&asoc->sent_queue);
10405                 if (at != NULL) {
10406                         for (i = 0; i < cnt_of_skipped; i++) {
10407                                 tp1 = TAILQ_NEXT(at, sctp_next);
10408                                 if (tp1 == NULL) {
10409                                         break;
10410                                 }
10411                                 at = tp1;
10412                         }
10413                 }
10414                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10415                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10416                             0xff, cnt_of_skipped, at->rec.data.tsn,
10417                             asoc->advanced_peer_ack_point);
10418                 }
10419                 last = at;
10420                 /*-
10421                  * last now points to last one I can report, update
10422                  * peer ack point
10423                  */
10424                 if (last) {
10425                         advance_peer_ack_point = last->rec.data.tsn;
10426                 }
10427                 if (asoc->idata_supported) {
10428                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10429                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10430                 } else {
10431                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10432                             cnt_of_skipped * sizeof(struct sctp_strseq);
10433                 }
10434         }
10435         chk->send_size = space_needed;
10436         /* Setup the chunk */
10437         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10438         fwdtsn->ch.chunk_length = htons(chk->send_size);
10439         fwdtsn->ch.chunk_flags = 0;
10440         if (asoc->idata_supported) {
10441                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10442         } else {
10443                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10444         }
10445         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10446         SCTP_BUF_LEN(chk->data) = chk->send_size;
10447         fwdtsn++;
10448         /*-
10449          * Move pointer to after the fwdtsn and transfer to the
10450          * strseq pointer.
10451          */
10452         if (asoc->idata_supported) {
10453                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10454                 strseq = NULL;
10455         } else {
10456                 strseq = (struct sctp_strseq *)fwdtsn;
10457                 strseq_m = NULL;
10458         }
10459         /*-
10460          * Now populate the strseq list. This is done blindly
10461          * without pulling out duplicate stream info. This is
10462          * inefficent but won't harm the process since the peer will
10463          * look at these in sequence and will thus release anything.
10464          * It could mean we exceed the PMTU and chop off some that
10465          * we could have included.. but this is unlikely (aka 1432/4
10466          * would mean 300+ stream seq's would have to be reported in
10467          * one FWD-TSN. With a bit of work we can later FIX this to
10468          * optimize and pull out duplicates.. but it does add more
10469          * overhead. So for now... not!
10470          */
10471         i = 0;
10472         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10473                 if (i >= cnt_of_skipped) {
10474                         break;
10475                 }
10476                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10477                         /* We don't report these */
10478                         continue;
10479                 }
10480                 if (at->rec.data.tsn == advance_peer_ack_point) {
10481                         at->rec.data.fwd_tsn_cnt = 0;
10482                 }
10483                 if (asoc->idata_supported) {
10484                         strseq_m->sid = htons(at->rec.data.sid);
10485                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10486                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10487                         } else {
10488                                 strseq_m->flags = 0;
10489                         }
10490                         strseq_m->mid = htonl(at->rec.data.mid);
10491                         strseq_m++;
10492                 } else {
10493                         strseq->sid = htons(at->rec.data.sid);
10494                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10495                         strseq++;
10496                 }
10497                 i++;
10498         }
10499         return;
10500 }
10501
10502 void
10503 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10504 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10505     SCTP_UNUSED
10506 #endif
10507 )
10508 {
10509         /*-
10510          * Queue up a SACK or NR-SACK in the control queue.
10511          * We must first check to see if a SACK or NR-SACK is
10512          * somehow on the control queue.
10513          * If so, we will take and and remove the old one.
10514          */
10515         struct sctp_association *asoc;
10516         struct sctp_tmit_chunk *chk, *a_chk;
10517         struct sctp_sack_chunk *sack;
10518         struct sctp_nr_sack_chunk *nr_sack;
10519         struct sctp_gap_ack_block *gap_descriptor;
10520         const struct sack_track *selector;
10521         int mergeable = 0;
10522         int offset;
10523         caddr_t limit;
10524         uint32_t *dup;
10525         int limit_reached = 0;
10526         unsigned int i, siz, j;
10527         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10528         int num_dups = 0;
10529         int space_req;
10530         uint32_t highest_tsn;
10531         uint8_t flags;
10532         uint8_t type;
10533         uint8_t tsn_map;
10534
10535         if (stcb->asoc.nrsack_supported == 1) {
10536                 type = SCTP_NR_SELECTIVE_ACK;
10537         } else {
10538                 type = SCTP_SELECTIVE_ACK;
10539         }
10540         a_chk = NULL;
10541         asoc = &stcb->asoc;
10542         SCTP_TCB_LOCK_ASSERT(stcb);
10543         if (asoc->last_data_chunk_from == NULL) {
10544                 /* Hmm we never received anything */
10545                 return;
10546         }
10547         sctp_slide_mapping_arrays(stcb);
10548         sctp_set_rwnd(stcb, asoc);
10549         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10550                 if (chk->rec.chunk_id.id == type) {
10551                         /* Hmm, found a sack already on queue, remove it */
10552                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10553                         asoc->ctrl_queue_cnt--;
10554                         a_chk = chk;
10555                         if (a_chk->data) {
10556                                 sctp_m_freem(a_chk->data);
10557                                 a_chk->data = NULL;
10558                         }
10559                         if (a_chk->whoTo) {
10560                                 sctp_free_remote_addr(a_chk->whoTo);
10561                                 a_chk->whoTo = NULL;
10562                         }
10563                         break;
10564                 }
10565         }
10566         if (a_chk == NULL) {
10567                 sctp_alloc_a_chunk(stcb, a_chk);
10568                 if (a_chk == NULL) {
10569                         /* No memory so we drop the idea, and set a timer */
10570                         if (stcb->asoc.delayed_ack) {
10571                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10572                                     stcb->sctp_ep, stcb, NULL,
10573                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10574                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10575                                     stcb->sctp_ep, stcb, NULL);
10576                         } else {
10577                                 stcb->asoc.send_sack = 1;
10578                         }
10579                         return;
10580                 }
10581                 a_chk->copy_by_ref = 0;
10582                 a_chk->rec.chunk_id.id = type;
10583                 a_chk->rec.chunk_id.can_take_data = 1;
10584         }
10585         /* Clear our pkt counts */
10586         asoc->data_pkts_seen = 0;
10587
10588         a_chk->flags = 0;
10589         a_chk->asoc = asoc;
10590         a_chk->snd_count = 0;
10591         a_chk->send_size = 0;   /* fill in later */
10592         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10593         a_chk->whoTo = NULL;
10594
10595         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10596                 /*-
10597                  * Ok, the destination for the SACK is unreachable, lets see if
10598                  * we can select an alternate to asoc->last_data_chunk_from
10599                  */
10600                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10601                 if (a_chk->whoTo == NULL) {
10602                         /* Nope, no alternate */
10603                         a_chk->whoTo = asoc->last_data_chunk_from;
10604                 }
10605         } else {
10606                 a_chk->whoTo = asoc->last_data_chunk_from;
10607         }
10608         if (a_chk->whoTo) {
10609                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10610         }
10611         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10612                 highest_tsn = asoc->highest_tsn_inside_map;
10613         } else {
10614                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10615         }
10616         if (highest_tsn == asoc->cumulative_tsn) {
10617                 /* no gaps */
10618                 if (type == SCTP_SELECTIVE_ACK) {
10619                         space_req = sizeof(struct sctp_sack_chunk);
10620                 } else {
10621                         space_req = sizeof(struct sctp_nr_sack_chunk);
10622                 }
10623         } else {
10624                 /* gaps get a cluster */
10625                 space_req = MCLBYTES;
10626         }
10627         /* Ok now lets formulate a MBUF with our sack */
10628         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10629         if ((a_chk->data == NULL) ||
10630             (a_chk->whoTo == NULL)) {
10631                 /* rats, no mbuf memory */
10632                 if (a_chk->data) {
10633                         /* was a problem with the destination */
10634                         sctp_m_freem(a_chk->data);
10635                         a_chk->data = NULL;
10636                 }
10637                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10638                 /* sa_ignore NO_NULL_CHK */
10639                 if (stcb->asoc.delayed_ack) {
10640                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10641                             stcb->sctp_ep, stcb, NULL,
10642                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10643                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10644                             stcb->sctp_ep, stcb, NULL);
10645                 } else {
10646                         stcb->asoc.send_sack = 1;
10647                 }
10648                 return;
10649         }
10650         /* ok, lets go through and fill it in */
10651         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10652         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10653         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10654                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10655         }
10656         limit = mtod(a_chk->data, caddr_t);
10657         limit += space;
10658
10659         flags = 0;
10660
10661         if ((asoc->sctp_cmt_on_off > 0) &&
10662             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10663                 /*-
10664                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10665                  * received, then set high bit to 1, else 0. Reset
10666                  * pkts_rcvd.
10667                  */
10668                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10669                 asoc->cmt_dac_pkts_rcvd = 0;
10670         }
10671 #ifdef SCTP_ASOCLOG_OF_TSNS
10672         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10673         stcb->asoc.cumack_log_atsnt++;
10674         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10675                 stcb->asoc.cumack_log_atsnt = 0;
10676         }
10677 #endif
10678         /* reset the readers interpretation */
10679         stcb->freed_by_sorcv_sincelast = 0;
10680
10681         if (type == SCTP_SELECTIVE_ACK) {
10682                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10683                 nr_sack = NULL;
10684                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10685                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10686                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10687                 } else {
10688                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10689                 }
10690         } else {
10691                 sack = NULL;
10692                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10693                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10694                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10695                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10696                 } else {
10697                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10698                 }
10699         }
10700
10701         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10702                 offset = 1;
10703         } else {
10704                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10705         }
10706         if (((type == SCTP_SELECTIVE_ACK) &&
10707             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10708             ((type == SCTP_NR_SELECTIVE_ACK) &&
10709             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10710                 /* we have a gap .. maybe */
10711                 for (i = 0; i < siz; i++) {
10712                         tsn_map = asoc->mapping_array[i];
10713                         if (type == SCTP_SELECTIVE_ACK) {
10714                                 tsn_map |= asoc->nr_mapping_array[i];
10715                         }
10716                         if (i == 0) {
10717                                 /*
10718                                  * Clear all bits corresponding to TSNs
10719                                  * smaller or equal to the cumulative TSN.
10720                                  */
10721                                 tsn_map &= (~0U << (1 - offset));
10722                         }
10723                         selector = &sack_array[tsn_map];
10724                         if (mergeable && selector->right_edge) {
10725                                 /*
10726                                  * Backup, left and right edges were ok to
10727                                  * merge.
10728                                  */
10729                                 num_gap_blocks--;
10730                                 gap_descriptor--;
10731                         }
10732                         if (selector->num_entries == 0)
10733                                 mergeable = 0;
10734                         else {
10735                                 for (j = 0; j < selector->num_entries; j++) {
10736                                         if (mergeable && selector->right_edge) {
10737                                                 /*
10738                                                  * do a merge by NOT setting
10739                                                  * the left side
10740                                                  */
10741                                                 mergeable = 0;
10742                                         } else {
10743                                                 /*
10744                                                  * no merge, set the left
10745                                                  * side
10746                                                  */
10747                                                 mergeable = 0;
10748                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10749                                         }
10750                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10751                                         num_gap_blocks++;
10752                                         gap_descriptor++;
10753                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10754                                                 /* no more room */
10755                                                 limit_reached = 1;
10756                                                 break;
10757                                         }
10758                                 }
10759                                 if (selector->left_edge) {
10760                                         mergeable = 1;
10761                                 }
10762                         }
10763                         if (limit_reached) {
10764                                 /* Reached the limit stop */
10765                                 break;
10766                         }
10767                         offset += 8;
10768                 }
10769         }
10770         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10771             (limit_reached == 0)) {
10772
10773                 mergeable = 0;
10774
10775                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10776                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10777                 } else {
10778                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10779                 }
10780
10781                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10782                         offset = 1;
10783                 } else {
10784                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10785                 }
10786                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10787                         /* we have a gap .. maybe */
10788                         for (i = 0; i < siz; i++) {
10789                                 tsn_map = asoc->nr_mapping_array[i];
10790                                 if (i == 0) {
10791                                         /*
10792                                          * Clear all bits corresponding to
10793                                          * TSNs smaller or equal to the
10794                                          * cumulative TSN.
10795                                          */
10796                                         tsn_map &= (~0U << (1 - offset));
10797                                 }
10798                                 selector = &sack_array[tsn_map];
10799                                 if (mergeable && selector->right_edge) {
10800                                         /*
10801                                          * Backup, left and right edges were
10802                                          * ok to merge.
10803                                          */
10804                                         num_nr_gap_blocks--;
10805                                         gap_descriptor--;
10806                                 }
10807                                 if (selector->num_entries == 0)
10808                                         mergeable = 0;
10809                                 else {
10810                                         for (j = 0; j < selector->num_entries; j++) {
10811                                                 if (mergeable && selector->right_edge) {
10812                                                         /*
10813                                                          * do a merge by NOT
10814                                                          * setting the left
10815                                                          * side
10816                                                          */
10817                                                         mergeable = 0;
10818                                                 } else {
10819                                                         /*
10820                                                          * no merge, set the
10821                                                          * left side
10822                                                          */
10823                                                         mergeable = 0;
10824                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10825                                                 }
10826                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10827                                                 num_nr_gap_blocks++;
10828                                                 gap_descriptor++;
10829                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10830                                                         /* no more room */
10831                                                         limit_reached = 1;
10832                                                         break;
10833                                                 }
10834                                         }
10835                                         if (selector->left_edge) {
10836                                                 mergeable = 1;
10837                                         }
10838                                 }
10839                                 if (limit_reached) {
10840                                         /* Reached the limit stop */
10841                                         break;
10842                                 }
10843                                 offset += 8;
10844                         }
10845                 }
10846         }
10847         /* now we must add any dups we are going to report. */
10848         if ((limit_reached == 0) && (asoc->numduptsns)) {
10849                 dup = (uint32_t *)gap_descriptor;
10850                 for (i = 0; i < asoc->numduptsns; i++) {
10851                         *dup = htonl(asoc->dup_tsns[i]);
10852                         dup++;
10853                         num_dups++;
10854                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10855                                 /* no more room */
10856                                 break;
10857                         }
10858                 }
10859                 asoc->numduptsns = 0;
10860         }
10861         /*
10862          * now that the chunk is prepared queue it to the control chunk
10863          * queue.
10864          */
10865         if (type == SCTP_SELECTIVE_ACK) {
10866                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10867                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10868                     num_dups * sizeof(int32_t));
10869                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10870                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10871                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10872                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10873                 sack->sack.num_dup_tsns = htons(num_dups);
10874                 sack->ch.chunk_type = type;
10875                 sack->ch.chunk_flags = flags;
10876                 sack->ch.chunk_length = htons(a_chk->send_size);
10877         } else {
10878                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10879                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10880                     num_dups * sizeof(int32_t));
10881                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10882                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10883                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10884                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10885                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10886                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10887                 nr_sack->nr_sack.reserved = 0;
10888                 nr_sack->ch.chunk_type = type;
10889                 nr_sack->ch.chunk_flags = flags;
10890                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10891         }
10892         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10893         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10894         asoc->ctrl_queue_cnt++;
10895         asoc->send_sack = 0;
10896         SCTP_STAT_INCR(sctps_sendsacks);
10897         return;
10898 }
10899
10900 void
10901 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10902 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10903     SCTP_UNUSED
10904 #endif
10905 )
10906 {
10907         struct mbuf *m_abort, *m, *m_last;
10908         struct mbuf *m_out, *m_end = NULL;
10909         struct sctp_abort_chunk *abort;
10910         struct sctp_auth_chunk *auth = NULL;
10911         struct sctp_nets *net;
10912         uint32_t vtag;
10913         uint32_t auth_offset = 0;
10914         int error;
10915         uint16_t cause_len, chunk_len, padding_len;
10916
10917         SCTP_TCB_LOCK_ASSERT(stcb);
10918         /*-
10919          * Add an AUTH chunk, if chunk requires it and save the offset into
10920          * the chain for AUTH
10921          */
10922         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10923             stcb->asoc.peer_auth_chunks)) {
10924                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10925                     stcb, SCTP_ABORT_ASSOCIATION);
10926                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10927         } else {
10928                 m_out = NULL;
10929         }
10930         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10931         if (m_abort == NULL) {
10932                 if (m_out) {
10933                         sctp_m_freem(m_out);
10934                 }
10935                 if (operr) {
10936                         sctp_m_freem(operr);
10937                 }
10938                 return;
10939         }
10940         /* link in any error */
10941         SCTP_BUF_NEXT(m_abort) = operr;
10942         cause_len = 0;
10943         m_last = NULL;
10944         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10945                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10946                 if (SCTP_BUF_NEXT(m) == NULL) {
10947                         m_last = m;
10948                 }
10949         }
10950         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10951         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10952         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10953         if (m_out == NULL) {
10954                 /* NO Auth chunk prepended, so reserve space in front */
10955                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10956                 m_out = m_abort;
10957         } else {
10958                 /* Put AUTH chunk at the front of the chain */
10959                 SCTP_BUF_NEXT(m_end) = m_abort;
10960         }
10961         if (stcb->asoc.alternate) {
10962                 net = stcb->asoc.alternate;
10963         } else {
10964                 net = stcb->asoc.primary_destination;
10965         }
10966         /* Fill in the ABORT chunk header. */
10967         abort = mtod(m_abort, struct sctp_abort_chunk *);
10968         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10969         if (stcb->asoc.peer_vtag == 0) {
10970                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10971                 vtag = stcb->asoc.my_vtag;
10972                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10973         } else {
10974                 vtag = stcb->asoc.peer_vtag;
10975                 abort->ch.chunk_flags = 0;
10976         }
10977         abort->ch.chunk_length = htons(chunk_len);
10978         /* Add padding, if necessary. */
10979         if (padding_len > 0) {
10980                 if ((m_last == NULL) ||
10981                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10982                         sctp_m_freem(m_out);
10983                         return;
10984                 }
10985         }
10986         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10987             (struct sockaddr *)&net->ro._l_addr,
10988             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10989             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10990             stcb->asoc.primary_destination->port, NULL,
10991             0, 0,
10992             so_locked))) {
10993                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10994                 if (error == ENOBUFS) {
10995                         stcb->asoc.ifp_had_enobuf = 1;
10996                         SCTP_STAT_INCR(sctps_lowlevelerr);
10997                 }
10998         } else {
10999                 stcb->asoc.ifp_had_enobuf = 0;
11000         }
11001         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11002 }
11003
11004 void
11005 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11006     struct sctp_nets *net,
11007     int reflect_vtag)
11008 {
11009         /* formulate and SEND a SHUTDOWN-COMPLETE */
11010         struct mbuf *m_shutdown_comp;
11011         struct sctp_shutdown_complete_chunk *shutdown_complete;
11012         uint32_t vtag;
11013         int error;
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         if ((error = 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                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11042                 if (error == ENOBUFS) {
11043                         stcb->asoc.ifp_had_enobuf = 1;
11044                         SCTP_STAT_INCR(sctps_lowlevelerr);
11045                 }
11046         } else {
11047                 stcb->asoc.ifp_had_enobuf = 0;
11048         }
11049         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11050         return;
11051 }
11052
11053 static void
11054 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11055     struct sctphdr *sh, uint32_t vtag,
11056     uint8_t type, struct mbuf *cause,
11057     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11058     uint32_t vrf_id, uint16_t port)
11059 {
11060         struct mbuf *o_pak;
11061         struct mbuf *mout;
11062         struct sctphdr *shout;
11063         struct sctp_chunkhdr *ch;
11064 #if defined(INET) || defined(INET6)
11065         struct udphdr *udp;
11066         int ret;
11067 #endif
11068         int len, cause_len, padding_len;
11069 #ifdef INET
11070         struct sockaddr_in *src_sin, *dst_sin;
11071         struct ip *ip;
11072 #endif
11073 #ifdef INET6
11074         struct sockaddr_in6 *src_sin6, *dst_sin6;
11075         struct ip6_hdr *ip6;
11076 #endif
11077
11078         /* Compute the length of the cause and add final padding. */
11079         cause_len = 0;
11080         if (cause != NULL) {
11081                 struct mbuf *m_at, *m_last = NULL;
11082
11083                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11084                         if (SCTP_BUF_NEXT(m_at) == NULL)
11085                                 m_last = m_at;
11086                         cause_len += SCTP_BUF_LEN(m_at);
11087                 }
11088                 padding_len = cause_len % 4;
11089                 if (padding_len != 0) {
11090                         padding_len = 4 - padding_len;
11091                 }
11092                 if (padding_len != 0) {
11093                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11094                                 sctp_m_freem(cause);
11095                                 return;
11096                         }
11097                 }
11098         } else {
11099                 padding_len = 0;
11100         }
11101         /* Get an mbuf for the header. */
11102         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11103         switch (dst->sa_family) {
11104 #ifdef INET
11105         case AF_INET:
11106                 len += sizeof(struct ip);
11107                 break;
11108 #endif
11109 #ifdef INET6
11110         case AF_INET6:
11111                 len += sizeof(struct ip6_hdr);
11112                 break;
11113 #endif
11114         default:
11115                 break;
11116         }
11117 #if defined(INET) || defined(INET6)
11118         if (port) {
11119                 len += sizeof(struct udphdr);
11120         }
11121 #endif
11122         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11123         if (mout == NULL) {
11124                 if (cause) {
11125                         sctp_m_freem(cause);
11126                 }
11127                 return;
11128         }
11129         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11130         SCTP_BUF_LEN(mout) = len;
11131         SCTP_BUF_NEXT(mout) = cause;
11132         M_SETFIB(mout, fibnum);
11133         mout->m_pkthdr.flowid = mflowid;
11134         M_HASHTYPE_SET(mout, mflowtype);
11135 #ifdef INET
11136         ip = NULL;
11137 #endif
11138 #ifdef INET6
11139         ip6 = NULL;
11140 #endif
11141         switch (dst->sa_family) {
11142 #ifdef INET
11143         case AF_INET:
11144                 src_sin = (struct sockaddr_in *)src;
11145                 dst_sin = (struct sockaddr_in *)dst;
11146                 ip = mtod(mout, struct ip *);
11147                 ip->ip_v = IPVERSION;
11148                 ip->ip_hl = (sizeof(struct ip) >> 2);
11149                 ip->ip_tos = 0;
11150                 ip->ip_off = htons(IP_DF);
11151                 ip_fillid(ip);
11152                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11153                 if (port) {
11154                         ip->ip_p = IPPROTO_UDP;
11155                 } else {
11156                         ip->ip_p = IPPROTO_SCTP;
11157                 }
11158                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11159                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11160                 ip->ip_sum = 0;
11161                 len = sizeof(struct ip);
11162                 shout = (struct sctphdr *)((caddr_t)ip + len);
11163                 break;
11164 #endif
11165 #ifdef INET6
11166         case AF_INET6:
11167                 src_sin6 = (struct sockaddr_in6 *)src;
11168                 dst_sin6 = (struct sockaddr_in6 *)dst;
11169                 ip6 = mtod(mout, struct ip6_hdr *);
11170                 ip6->ip6_flow = htonl(0x60000000);
11171                 if (V_ip6_auto_flowlabel) {
11172                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11173                 }
11174                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11175                 if (port) {
11176                         ip6->ip6_nxt = IPPROTO_UDP;
11177                 } else {
11178                         ip6->ip6_nxt = IPPROTO_SCTP;
11179                 }
11180                 ip6->ip6_src = dst_sin6->sin6_addr;
11181                 ip6->ip6_dst = src_sin6->sin6_addr;
11182                 len = sizeof(struct ip6_hdr);
11183                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11184                 break;
11185 #endif
11186         default:
11187                 len = 0;
11188                 shout = mtod(mout, struct sctphdr *);
11189                 break;
11190         }
11191 #if defined(INET) || defined(INET6)
11192         if (port) {
11193                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11194                         sctp_m_freem(mout);
11195                         return;
11196                 }
11197                 udp = (struct udphdr *)shout;
11198                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11199                 udp->uh_dport = port;
11200                 udp->uh_sum = 0;
11201                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11202                     sizeof(struct sctphdr) +
11203                     sizeof(struct sctp_chunkhdr) +
11204                     cause_len + padding_len));
11205                 len += sizeof(struct udphdr);
11206                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11207         } else {
11208                 udp = NULL;
11209         }
11210 #endif
11211         shout->src_port = sh->dest_port;
11212         shout->dest_port = sh->src_port;
11213         shout->checksum = 0;
11214         if (vtag) {
11215                 shout->v_tag = htonl(vtag);
11216         } else {
11217                 shout->v_tag = sh->v_tag;
11218         }
11219         len += sizeof(struct sctphdr);
11220         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11221         ch->chunk_type = type;
11222         if (vtag) {
11223                 ch->chunk_flags = 0;
11224         } else {
11225                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11226         }
11227         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11228         len += sizeof(struct sctp_chunkhdr);
11229         len += cause_len + padding_len;
11230
11231         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11232                 sctp_m_freem(mout);
11233                 return;
11234         }
11235         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11236         switch (dst->sa_family) {
11237 #ifdef INET
11238         case AF_INET:
11239                 if (port) {
11240                         if (V_udp_cksum) {
11241                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11242                         } else {
11243                                 udp->uh_sum = 0;
11244                         }
11245                 }
11246                 ip->ip_len = htons(len);
11247                 if (port) {
11248 #if defined(SCTP_WITH_NO_CSUM)
11249                         SCTP_STAT_INCR(sctps_sendnocrc);
11250 #else
11251                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11252                         SCTP_STAT_INCR(sctps_sendswcrc);
11253 #endif
11254                         if (V_udp_cksum) {
11255                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11256                         }
11257                 } else {
11258 #if defined(SCTP_WITH_NO_CSUM)
11259                         SCTP_STAT_INCR(sctps_sendnocrc);
11260 #else
11261                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11262                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11263                         SCTP_STAT_INCR(sctps_sendhwcrc);
11264 #endif
11265                 }
11266 #ifdef SCTP_PACKET_LOGGING
11267                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11268                         sctp_packet_log(o_pak);
11269                 }
11270 #endif
11271                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11272                 break;
11273 #endif
11274 #ifdef INET6
11275         case AF_INET6:
11276                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11277                 if (port) {
11278 #if defined(SCTP_WITH_NO_CSUM)
11279                         SCTP_STAT_INCR(sctps_sendnocrc);
11280 #else
11281                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11282                         SCTP_STAT_INCR(sctps_sendswcrc);
11283 #endif
11284                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11285                                 udp->uh_sum = 0xffff;
11286                         }
11287                 } else {
11288 #if defined(SCTP_WITH_NO_CSUM)
11289                         SCTP_STAT_INCR(sctps_sendnocrc);
11290 #else
11291                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11292                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11293                         SCTP_STAT_INCR(sctps_sendhwcrc);
11294 #endif
11295                 }
11296 #ifdef SCTP_PACKET_LOGGING
11297                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11298                         sctp_packet_log(o_pak);
11299                 }
11300 #endif
11301                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11302                 break;
11303 #endif
11304         default:
11305                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11306                     dst->sa_family);
11307                 sctp_m_freem(mout);
11308                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11309                 return;
11310         }
11311         SCTP_STAT_INCR(sctps_sendpackets);
11312         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11313         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11314         return;
11315 }
11316
11317 void
11318 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11319     struct sctphdr *sh,
11320     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11321     uint32_t vrf_id, uint16_t port)
11322 {
11323         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11324             mflowtype, mflowid, fibnum,
11325             vrf_id, port);
11326 }
11327
11328 void
11329 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11330 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11331     SCTP_UNUSED
11332 #endif
11333 )
11334 {
11335         struct sctp_tmit_chunk *chk;
11336         struct sctp_heartbeat_chunk *hb;
11337         struct timeval now;
11338
11339         SCTP_TCB_LOCK_ASSERT(stcb);
11340         if (net == NULL) {
11341                 return;
11342         }
11343         (void)SCTP_GETTIME_TIMEVAL(&now);
11344         switch (net->ro._l_addr.sa.sa_family) {
11345 #ifdef INET
11346         case AF_INET:
11347                 break;
11348 #endif
11349 #ifdef INET6
11350         case AF_INET6:
11351                 break;
11352 #endif
11353         default:
11354                 return;
11355         }
11356         sctp_alloc_a_chunk(stcb, chk);
11357         if (chk == NULL) {
11358                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11359                 return;
11360         }
11361         chk->copy_by_ref = 0;
11362         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11363         chk->rec.chunk_id.can_take_data = 1;
11364         chk->flags = 0;
11365         chk->asoc = &stcb->asoc;
11366         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11367
11368         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11369         if (chk->data == NULL) {
11370                 sctp_free_a_chunk(stcb, chk, so_locked);
11371                 return;
11372         }
11373         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11374         SCTP_BUF_LEN(chk->data) = chk->send_size;
11375         chk->sent = SCTP_DATAGRAM_UNSENT;
11376         chk->snd_count = 0;
11377         chk->whoTo = net;
11378         atomic_add_int(&chk->whoTo->ref_count, 1);
11379         /* Now we have a mbuf that we can fill in with the details */
11380         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11381         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11382         /* fill out chunk header */
11383         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11384         hb->ch.chunk_flags = 0;
11385         hb->ch.chunk_length = htons(chk->send_size);
11386         /* Fill out hb parameter */
11387         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11388         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11389         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11390         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11391         /* Did our user request this one, put it in */
11392         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11393         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11394         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11395                 /*
11396                  * we only take from the entropy pool if the address is not
11397                  * confirmed.
11398                  */
11399                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11400                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11401         } else {
11402                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11403                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11404         }
11405         switch (net->ro._l_addr.sa.sa_family) {
11406 #ifdef INET
11407         case AF_INET:
11408                 memcpy(hb->heartbeat.hb_info.address,
11409                     &net->ro._l_addr.sin.sin_addr,
11410                     sizeof(net->ro._l_addr.sin.sin_addr));
11411                 break;
11412 #endif
11413 #ifdef INET6
11414         case AF_INET6:
11415                 memcpy(hb->heartbeat.hb_info.address,
11416                     &net->ro._l_addr.sin6.sin6_addr,
11417                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11418                 break;
11419 #endif
11420         default:
11421                 if (chk->data) {
11422                         sctp_m_freem(chk->data);
11423                         chk->data = NULL;
11424                 }
11425                 sctp_free_a_chunk(stcb, chk, so_locked);
11426                 return;
11427                 break;
11428         }
11429         net->hb_responded = 0;
11430         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11431         stcb->asoc.ctrl_queue_cnt++;
11432         SCTP_STAT_INCR(sctps_sendheartbeat);
11433         return;
11434 }
11435
11436 void
11437 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11438     uint32_t high_tsn)
11439 {
11440         struct sctp_association *asoc;
11441         struct sctp_ecne_chunk *ecne;
11442         struct sctp_tmit_chunk *chk;
11443
11444         if (net == NULL) {
11445                 return;
11446         }
11447         asoc = &stcb->asoc;
11448         SCTP_TCB_LOCK_ASSERT(stcb);
11449         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11450                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11451                         /* found a previous ECN_ECHO update it if needed */
11452                         uint32_t cnt, ctsn;
11453
11454                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11455                         ctsn = ntohl(ecne->tsn);
11456                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11457                                 ecne->tsn = htonl(high_tsn);
11458                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11459                         }
11460                         cnt = ntohl(ecne->num_pkts_since_cwr);
11461                         cnt++;
11462                         ecne->num_pkts_since_cwr = htonl(cnt);
11463                         return;
11464                 }
11465         }
11466         /* nope could not find one to update so we must build one */
11467         sctp_alloc_a_chunk(stcb, chk);
11468         if (chk == NULL) {
11469                 return;
11470         }
11471         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11472         chk->copy_by_ref = 0;
11473         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11474         chk->rec.chunk_id.can_take_data = 0;
11475         chk->flags = 0;
11476         chk->asoc = &stcb->asoc;
11477         chk->send_size = sizeof(struct sctp_ecne_chunk);
11478         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11479         if (chk->data == NULL) {
11480                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11481                 return;
11482         }
11483         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11484         SCTP_BUF_LEN(chk->data) = chk->send_size;
11485         chk->sent = SCTP_DATAGRAM_UNSENT;
11486         chk->snd_count = 0;
11487         chk->whoTo = net;
11488         atomic_add_int(&chk->whoTo->ref_count, 1);
11489
11490         stcb->asoc.ecn_echo_cnt_onq++;
11491         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11492         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11493         ecne->ch.chunk_flags = 0;
11494         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11495         ecne->tsn = htonl(high_tsn);
11496         ecne->num_pkts_since_cwr = htonl(1);
11497         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11498         asoc->ctrl_queue_cnt++;
11499 }
11500
11501 void
11502 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11503     struct mbuf *m, int len, int iphlen, int bad_crc)
11504 {
11505         struct sctp_association *asoc;
11506         struct sctp_pktdrop_chunk *drp;
11507         struct sctp_tmit_chunk *chk;
11508         uint8_t *datap;
11509         int was_trunc = 0;
11510         int fullsz = 0;
11511         long spc;
11512         int offset;
11513         struct sctp_chunkhdr *ch, chunk_buf;
11514         unsigned int chk_length;
11515
11516         if (!stcb) {
11517                 return;
11518         }
11519         asoc = &stcb->asoc;
11520         SCTP_TCB_LOCK_ASSERT(stcb);
11521         if (asoc->pktdrop_supported == 0) {
11522                 /*-
11523                  * peer must declare support before I send one.
11524                  */
11525                 return;
11526         }
11527         if (stcb->sctp_socket == NULL) {
11528                 return;
11529         }
11530         sctp_alloc_a_chunk(stcb, chk);
11531         if (chk == NULL) {
11532                 return;
11533         }
11534         chk->copy_by_ref = 0;
11535         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11536         chk->rec.chunk_id.can_take_data = 1;
11537         chk->flags = 0;
11538         len -= iphlen;
11539         chk->send_size = len;
11540         /* Validate that we do not have an ABORT in here. */
11541         offset = iphlen + sizeof(struct sctphdr);
11542         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11543             sizeof(*ch), (uint8_t *)&chunk_buf);
11544         while (ch != NULL) {
11545                 chk_length = ntohs(ch->chunk_length);
11546                 if (chk_length < sizeof(*ch)) {
11547                         /* break to abort land */
11548                         break;
11549                 }
11550                 switch (ch->chunk_type) {
11551                 case SCTP_PACKET_DROPPED:
11552                 case SCTP_ABORT_ASSOCIATION:
11553                 case SCTP_INITIATION_ACK:
11554                         /**
11555                          * We don't respond with an PKT-DROP to an ABORT
11556                          * or PKT-DROP. We also do not respond to an
11557                          * INIT-ACK, because we can't know if the initiation
11558                          * tag is correct or not.
11559                          */
11560                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11561                         return;
11562                 default:
11563                         break;
11564                 }
11565                 offset += SCTP_SIZE32(chk_length);
11566                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11567                     sizeof(*ch), (uint8_t *)&chunk_buf);
11568         }
11569
11570         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11571             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11572                 /*
11573                  * only send 1 mtu worth, trim off the excess on the end.
11574                  */
11575                 fullsz = len;
11576                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11577                 was_trunc = 1;
11578         }
11579         chk->asoc = &stcb->asoc;
11580         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11581         if (chk->data == NULL) {
11582 jump_out:
11583                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11584                 return;
11585         }
11586         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11587         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11588         if (drp == NULL) {
11589                 sctp_m_freem(chk->data);
11590                 chk->data = NULL;
11591                 goto jump_out;
11592         }
11593         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11594             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11595         chk->book_size_scale = 0;
11596         if (was_trunc) {
11597                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11598                 drp->trunc_len = htons(fullsz);
11599                 /*
11600                  * Len is already adjusted to size minus overhead above take
11601                  * out the pkt_drop chunk itself from it.
11602                  */
11603                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11604                 len = chk->send_size;
11605         } else {
11606                 /* no truncation needed */
11607                 drp->ch.chunk_flags = 0;
11608                 drp->trunc_len = htons(0);
11609         }
11610         if (bad_crc) {
11611                 drp->ch.chunk_flags |= SCTP_BADCRC;
11612         }
11613         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11614         SCTP_BUF_LEN(chk->data) = chk->send_size;
11615         chk->sent = SCTP_DATAGRAM_UNSENT;
11616         chk->snd_count = 0;
11617         if (net) {
11618                 /* we should hit here */
11619                 chk->whoTo = net;
11620                 atomic_add_int(&chk->whoTo->ref_count, 1);
11621         } else {
11622                 chk->whoTo = NULL;
11623         }
11624         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11625         drp->ch.chunk_length = htons(chk->send_size);
11626         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11627         if (spc < 0) {
11628                 spc = 0;
11629         }
11630         drp->bottle_bw = htonl(spc);
11631         if (asoc->my_rwnd) {
11632                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11633                     asoc->size_on_all_streams +
11634                     asoc->my_rwnd_control_len +
11635                     stcb->sctp_socket->so_rcv.sb_cc);
11636         } else {
11637                 /*-
11638                  * If my rwnd is 0, possibly from mbuf depletion as well as
11639                  * space used, tell the peer there is NO space aka onq == bw
11640                  */
11641                 drp->current_onq = htonl(spc);
11642         }
11643         drp->reserved = 0;
11644         datap = drp->data;
11645         m_copydata(m, iphlen, len, (caddr_t)datap);
11646         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11647         asoc->ctrl_queue_cnt++;
11648 }
11649
11650 void
11651 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11652 {
11653         struct sctp_association *asoc;
11654         struct sctp_cwr_chunk *cwr;
11655         struct sctp_tmit_chunk *chk;
11656
11657         SCTP_TCB_LOCK_ASSERT(stcb);
11658         if (net == NULL) {
11659                 return;
11660         }
11661         asoc = &stcb->asoc;
11662         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11663                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11664                         /*
11665                          * found a previous CWR queued to same destination
11666                          * update it if needed
11667                          */
11668                         uint32_t ctsn;
11669
11670                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11671                         ctsn = ntohl(cwr->tsn);
11672                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11673                                 cwr->tsn = htonl(high_tsn);
11674                         }
11675                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11676                                 /* Make sure override is carried */
11677                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11678                         }
11679                         return;
11680                 }
11681         }
11682         sctp_alloc_a_chunk(stcb, chk);
11683         if (chk == NULL) {
11684                 return;
11685         }
11686         chk->copy_by_ref = 0;
11687         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11688         chk->rec.chunk_id.can_take_data = 1;
11689         chk->flags = 0;
11690         chk->asoc = &stcb->asoc;
11691         chk->send_size = sizeof(struct sctp_cwr_chunk);
11692         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11693         if (chk->data == NULL) {
11694                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11695                 return;
11696         }
11697         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11698         SCTP_BUF_LEN(chk->data) = chk->send_size;
11699         chk->sent = SCTP_DATAGRAM_UNSENT;
11700         chk->snd_count = 0;
11701         chk->whoTo = net;
11702         atomic_add_int(&chk->whoTo->ref_count, 1);
11703         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11704         cwr->ch.chunk_type = SCTP_ECN_CWR;
11705         cwr->ch.chunk_flags = override;
11706         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11707         cwr->tsn = htonl(high_tsn);
11708         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11709         asoc->ctrl_queue_cnt++;
11710 }
11711
11712 static int
11713 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11714     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11715 {
11716         uint16_t len, old_len, i;
11717         struct sctp_stream_reset_out_request *req_out;
11718         struct sctp_chunkhdr *ch;
11719         int at;
11720         int number_entries = 0;
11721
11722         ch = mtod(chk->data, struct sctp_chunkhdr *);
11723         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11724         /* get to new offset for the param. */
11725         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11726         /* now how long will this param be? */
11727         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11728                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11729                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11730                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11731                         number_entries++;
11732                 }
11733         }
11734         if (number_entries == 0) {
11735                 return (0);
11736         }
11737         if (number_entries == stcb->asoc.streamoutcnt) {
11738                 number_entries = 0;
11739         }
11740         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11741                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11742         }
11743         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11744         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11745         req_out->ph.param_length = htons(len);
11746         req_out->request_seq = htonl(seq);
11747         req_out->response_seq = htonl(resp_seq);
11748         req_out->send_reset_at_tsn = htonl(last_sent);
11749         at = 0;
11750         if (number_entries) {
11751                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11752                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11753                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11754                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11755                                 req_out->list_of_streams[at] = htons(i);
11756                                 at++;
11757                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11758                                 if (at >= number_entries) {
11759                                         break;
11760                                 }
11761                         }
11762                 }
11763         } else {
11764                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11765                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11766                 }
11767         }
11768         if (SCTP_SIZE32(len) > len) {
11769                 /*-
11770                  * Need to worry about the pad we may end up adding to the
11771                  * end. This is easy since the struct is either aligned to 4
11772                  * bytes or 2 bytes off.
11773                  */
11774                 req_out->list_of_streams[number_entries] = 0;
11775         }
11776         /* now fix the chunk length */
11777         ch->chunk_length = htons(len + old_len);
11778         chk->book_size = len + old_len;
11779         chk->book_size_scale = 0;
11780         chk->send_size = SCTP_SIZE32(chk->book_size);
11781         SCTP_BUF_LEN(chk->data) = chk->send_size;
11782         return (1);
11783 }
11784
11785 static void
11786 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11787     int number_entries, uint16_t *list,
11788     uint32_t seq)
11789 {
11790         uint16_t len, old_len, i;
11791         struct sctp_stream_reset_in_request *req_in;
11792         struct sctp_chunkhdr *ch;
11793
11794         ch = mtod(chk->data, struct sctp_chunkhdr *);
11795         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11796
11797         /* get to new offset for the param. */
11798         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11799         /* now how long will this param be? */
11800         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11801         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11802         req_in->ph.param_length = htons(len);
11803         req_in->request_seq = htonl(seq);
11804         if (number_entries) {
11805                 for (i = 0; i < number_entries; i++) {
11806                         req_in->list_of_streams[i] = htons(list[i]);
11807                 }
11808         }
11809         if (SCTP_SIZE32(len) > len) {
11810                 /*-
11811                  * Need to worry about the pad we may end up adding to the
11812                  * end. This is easy since the struct is either aligned to 4
11813                  * bytes or 2 bytes off.
11814                  */
11815                 req_in->list_of_streams[number_entries] = 0;
11816         }
11817         /* now fix the chunk length */
11818         ch->chunk_length = htons(len + old_len);
11819         chk->book_size = len + old_len;
11820         chk->book_size_scale = 0;
11821         chk->send_size = SCTP_SIZE32(chk->book_size);
11822         SCTP_BUF_LEN(chk->data) = chk->send_size;
11823         return;
11824 }
11825
11826 static void
11827 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11828     uint32_t seq)
11829 {
11830         uint16_t len, old_len;
11831         struct sctp_stream_reset_tsn_request *req_tsn;
11832         struct sctp_chunkhdr *ch;
11833
11834         ch = mtod(chk->data, struct sctp_chunkhdr *);
11835         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11836
11837         /* get to new offset for the param. */
11838         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11839         /* now how long will this param be? */
11840         len = sizeof(struct sctp_stream_reset_tsn_request);
11841         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11842         req_tsn->ph.param_length = htons(len);
11843         req_tsn->request_seq = htonl(seq);
11844
11845         /* now fix the chunk length */
11846         ch->chunk_length = htons(len + old_len);
11847         chk->send_size = len + old_len;
11848         chk->book_size = SCTP_SIZE32(chk->send_size);
11849         chk->book_size_scale = 0;
11850         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11851         return;
11852 }
11853
11854 void
11855 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11856     uint32_t resp_seq, uint32_t result)
11857 {
11858         uint16_t len, old_len;
11859         struct sctp_stream_reset_response *resp;
11860         struct sctp_chunkhdr *ch;
11861
11862         ch = mtod(chk->data, struct sctp_chunkhdr *);
11863         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11864
11865         /* get to new offset for the param. */
11866         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11867         /* now how long will this param be? */
11868         len = sizeof(struct sctp_stream_reset_response);
11869         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11870         resp->ph.param_length = htons(len);
11871         resp->response_seq = htonl(resp_seq);
11872         resp->result = ntohl(result);
11873
11874         /* now fix the chunk length */
11875         ch->chunk_length = htons(len + old_len);
11876         chk->book_size = len + old_len;
11877         chk->book_size_scale = 0;
11878         chk->send_size = SCTP_SIZE32(chk->book_size);
11879         SCTP_BUF_LEN(chk->data) = chk->send_size;
11880         return;
11881 }
11882
11883 void
11884 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11885     struct sctp_stream_reset_list *ent,
11886     int response)
11887 {
11888         struct sctp_association *asoc;
11889         struct sctp_tmit_chunk *chk;
11890         struct sctp_chunkhdr *ch;
11891
11892         asoc = &stcb->asoc;
11893
11894         /*
11895          * Reset our last reset action to the new one IP -> response
11896          * (PERFORMED probably). This assures that if we fail to send, a
11897          * retran from the peer will get the new response.
11898          */
11899         asoc->last_reset_action[0] = response;
11900         if (asoc->stream_reset_outstanding) {
11901                 return;
11902         }
11903         sctp_alloc_a_chunk(stcb, chk);
11904         if (chk == NULL) {
11905                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11906                 return;
11907         }
11908         chk->copy_by_ref = 0;
11909         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11910         chk->rec.chunk_id.can_take_data = 0;
11911         chk->flags = 0;
11912         chk->asoc = &stcb->asoc;
11913         chk->book_size = sizeof(struct sctp_chunkhdr);
11914         chk->send_size = SCTP_SIZE32(chk->book_size);
11915         chk->book_size_scale = 0;
11916         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11917         if (chk->data == NULL) {
11918                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11919                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11920                 return;
11921         }
11922         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11923         /* setup chunk parameters */
11924         chk->sent = SCTP_DATAGRAM_UNSENT;
11925         chk->snd_count = 0;
11926         if (stcb->asoc.alternate) {
11927                 chk->whoTo = stcb->asoc.alternate;
11928         } else {
11929                 chk->whoTo = stcb->asoc.primary_destination;
11930         }
11931         ch = mtod(chk->data, struct sctp_chunkhdr *);
11932         ch->chunk_type = SCTP_STREAM_RESET;
11933         ch->chunk_flags = 0;
11934         ch->chunk_length = htons(chk->book_size);
11935         atomic_add_int(&chk->whoTo->ref_count, 1);
11936         SCTP_BUF_LEN(chk->data) = chk->send_size;
11937         sctp_add_stream_reset_result(chk, ent->seq, response);
11938         /* insert the chunk for sending */
11939         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11940             chk,
11941             sctp_next);
11942         asoc->ctrl_queue_cnt++;
11943 }
11944
11945 void
11946 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11947     uint32_t resp_seq, uint32_t result,
11948     uint32_t send_una, uint32_t recv_next)
11949 {
11950         uint16_t len, old_len;
11951         struct sctp_stream_reset_response_tsn *resp;
11952         struct sctp_chunkhdr *ch;
11953
11954         ch = mtod(chk->data, struct sctp_chunkhdr *);
11955         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11956
11957         /* get to new offset for the param. */
11958         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11959         /* now how long will this param be? */
11960         len = sizeof(struct sctp_stream_reset_response_tsn);
11961         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11962         resp->ph.param_length = htons(len);
11963         resp->response_seq = htonl(resp_seq);
11964         resp->result = htonl(result);
11965         resp->senders_next_tsn = htonl(send_una);
11966         resp->receivers_next_tsn = htonl(recv_next);
11967
11968         /* now fix the chunk length */
11969         ch->chunk_length = htons(len + old_len);
11970         chk->book_size = len + old_len;
11971         chk->send_size = SCTP_SIZE32(chk->book_size);
11972         chk->book_size_scale = 0;
11973         SCTP_BUF_LEN(chk->data) = chk->send_size;
11974         return;
11975 }
11976
11977 static void
11978 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11979     uint32_t seq,
11980     uint16_t adding)
11981 {
11982         uint16_t len, old_len;
11983         struct sctp_chunkhdr *ch;
11984         struct sctp_stream_reset_add_strm *addstr;
11985
11986         ch = mtod(chk->data, struct sctp_chunkhdr *);
11987         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11988
11989         /* get to new offset for the param. */
11990         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11991         /* now how long will this param be? */
11992         len = sizeof(struct sctp_stream_reset_add_strm);
11993
11994         /* Fill it out. */
11995         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11996         addstr->ph.param_length = htons(len);
11997         addstr->request_seq = htonl(seq);
11998         addstr->number_of_streams = htons(adding);
11999         addstr->reserved = 0;
12000
12001         /* now fix the chunk length */
12002         ch->chunk_length = htons(len + old_len);
12003         chk->send_size = len + old_len;
12004         chk->book_size = SCTP_SIZE32(chk->send_size);
12005         chk->book_size_scale = 0;
12006         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12007         return;
12008 }
12009
12010 static void
12011 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12012     uint32_t seq,
12013     uint16_t adding)
12014 {
12015         uint16_t len, old_len;
12016         struct sctp_chunkhdr *ch;
12017         struct sctp_stream_reset_add_strm *addstr;
12018
12019         ch = mtod(chk->data, struct sctp_chunkhdr *);
12020         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12021
12022         /* get to new offset for the param. */
12023         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12024         /* now how long will this param be? */
12025         len = sizeof(struct sctp_stream_reset_add_strm);
12026         /* Fill it out. */
12027         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12028         addstr->ph.param_length = htons(len);
12029         addstr->request_seq = htonl(seq);
12030         addstr->number_of_streams = htons(adding);
12031         addstr->reserved = 0;
12032
12033         /* now fix the chunk length */
12034         ch->chunk_length = htons(len + old_len);
12035         chk->send_size = len + old_len;
12036         chk->book_size = SCTP_SIZE32(chk->send_size);
12037         chk->book_size_scale = 0;
12038         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12039         return;
12040 }
12041
12042 int
12043 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12044 {
12045         struct sctp_association *asoc;
12046         struct sctp_tmit_chunk *chk;
12047         struct sctp_chunkhdr *ch;
12048         uint32_t seq;
12049
12050         asoc = &stcb->asoc;
12051         asoc->trigger_reset = 0;
12052         if (asoc->stream_reset_outstanding) {
12053                 return (EALREADY);
12054         }
12055         sctp_alloc_a_chunk(stcb, chk);
12056         if (chk == NULL) {
12057                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12058                 return (ENOMEM);
12059         }
12060         chk->copy_by_ref = 0;
12061         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12062         chk->rec.chunk_id.can_take_data = 0;
12063         chk->flags = 0;
12064         chk->asoc = &stcb->asoc;
12065         chk->book_size = sizeof(struct sctp_chunkhdr);
12066         chk->send_size = SCTP_SIZE32(chk->book_size);
12067         chk->book_size_scale = 0;
12068         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12069         if (chk->data == NULL) {
12070                 sctp_free_a_chunk(stcb, chk, so_locked);
12071                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12072                 return (ENOMEM);
12073         }
12074         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12075
12076         /* setup chunk parameters */
12077         chk->sent = SCTP_DATAGRAM_UNSENT;
12078         chk->snd_count = 0;
12079         if (stcb->asoc.alternate) {
12080                 chk->whoTo = stcb->asoc.alternate;
12081         } else {
12082                 chk->whoTo = stcb->asoc.primary_destination;
12083         }
12084         ch = mtod(chk->data, struct sctp_chunkhdr *);
12085         ch->chunk_type = SCTP_STREAM_RESET;
12086         ch->chunk_flags = 0;
12087         ch->chunk_length = htons(chk->book_size);
12088         atomic_add_int(&chk->whoTo->ref_count, 1);
12089         SCTP_BUF_LEN(chk->data) = chk->send_size;
12090         seq = stcb->asoc.str_reset_seq_out;
12091         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12092                 seq++;
12093                 asoc->stream_reset_outstanding++;
12094         } else {
12095                 m_freem(chk->data);
12096                 chk->data = NULL;
12097                 sctp_free_a_chunk(stcb, chk, so_locked);
12098                 return (ENOENT);
12099         }
12100         asoc->str_reset = chk;
12101         /* insert the chunk for sending */
12102         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12103             chk,
12104             sctp_next);
12105         asoc->ctrl_queue_cnt++;
12106
12107         if (stcb->asoc.send_sack) {
12108                 sctp_send_sack(stcb, so_locked);
12109         }
12110         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12111         return (0);
12112 }
12113
12114 int
12115 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12116     uint16_t number_entries, uint16_t *list,
12117     uint8_t send_in_req,
12118     uint8_t send_tsn_req,
12119     uint8_t add_stream,
12120     uint16_t adding_o,
12121     uint16_t adding_i, uint8_t peer_asked)
12122 {
12123         struct sctp_association *asoc;
12124         struct sctp_tmit_chunk *chk;
12125         struct sctp_chunkhdr *ch;
12126         int can_send_out_req = 0;
12127         uint32_t seq;
12128
12129         asoc = &stcb->asoc;
12130         if (asoc->stream_reset_outstanding) {
12131                 /*-
12132                  * Already one pending, must get ACK back to clear the flag.
12133                  */
12134                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12135                 return (EBUSY);
12136         }
12137         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12138             (add_stream == 0)) {
12139                 /* nothing to do */
12140                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12141                 return (EINVAL);
12142         }
12143         if (send_tsn_req && send_in_req) {
12144                 /* error, can't do that */
12145                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12146                 return (EINVAL);
12147         } else if (send_in_req) {
12148                 can_send_out_req = 1;
12149         }
12150         if (number_entries > (MCLBYTES -
12151             SCTP_MIN_OVERHEAD -
12152             sizeof(struct sctp_chunkhdr) -
12153             sizeof(struct sctp_stream_reset_out_request)) /
12154             sizeof(uint16_t)) {
12155                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12156                 return (ENOMEM);
12157         }
12158         sctp_alloc_a_chunk(stcb, chk);
12159         if (chk == NULL) {
12160                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12161                 return (ENOMEM);
12162         }
12163         chk->copy_by_ref = 0;
12164         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12165         chk->rec.chunk_id.can_take_data = 0;
12166         chk->flags = 0;
12167         chk->asoc = &stcb->asoc;
12168         chk->book_size = sizeof(struct sctp_chunkhdr);
12169         chk->send_size = SCTP_SIZE32(chk->book_size);
12170         chk->book_size_scale = 0;
12171
12172         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12173         if (chk->data == NULL) {
12174                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12175                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12176                 return (ENOMEM);
12177         }
12178         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12179
12180         /* setup chunk parameters */
12181         chk->sent = SCTP_DATAGRAM_UNSENT;
12182         chk->snd_count = 0;
12183         if (stcb->asoc.alternate) {
12184                 chk->whoTo = stcb->asoc.alternate;
12185         } else {
12186                 chk->whoTo = stcb->asoc.primary_destination;
12187         }
12188         atomic_add_int(&chk->whoTo->ref_count, 1);
12189         ch = mtod(chk->data, struct sctp_chunkhdr *);
12190         ch->chunk_type = SCTP_STREAM_RESET;
12191         ch->chunk_flags = 0;
12192         ch->chunk_length = htons(chk->book_size);
12193         SCTP_BUF_LEN(chk->data) = chk->send_size;
12194
12195         seq = stcb->asoc.str_reset_seq_out;
12196         if (can_send_out_req) {
12197                 int ret;
12198
12199                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12200                 if (ret) {
12201                         seq++;
12202                         asoc->stream_reset_outstanding++;
12203                 }
12204         }
12205         if ((add_stream & 1) &&
12206             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12207                 /* Need to allocate more */
12208                 struct sctp_stream_out *oldstream;
12209                 struct sctp_stream_queue_pending *sp, *nsp;
12210                 int i;
12211 #if defined(SCTP_DETAILED_STR_STATS)
12212                 int j;
12213 #endif
12214
12215                 oldstream = stcb->asoc.strmout;
12216                 /* get some more */
12217                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12218                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12219                     SCTP_M_STRMO);
12220                 if (stcb->asoc.strmout == NULL) {
12221                         uint8_t x;
12222
12223                         stcb->asoc.strmout = oldstream;
12224                         /* Turn off the bit */
12225                         x = add_stream & 0xfe;
12226                         add_stream = x;
12227                         goto skip_stuff;
12228                 }
12229                 /*
12230                  * Ok now we proceed with copying the old out stuff and
12231                  * initializing the new stuff.
12232                  */
12233                 SCTP_TCB_SEND_LOCK(stcb);
12234                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12235                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12236                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12237                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12238                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12239                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12240                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12241                         stcb->asoc.strmout[i].sid = i;
12242                         stcb->asoc.strmout[i].state = oldstream[i].state;
12243                         /* FIX ME FIX ME */
12244                         /*
12245                          * This should be a SS_COPY operation FIX ME STREAM
12246                          * SCHEDULER EXPERT
12247                          */
12248                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12249                         /* now anything on those queues? */
12250                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12251                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12252                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12253                         }
12254
12255                 }
12256                 /* now the new streams */
12257                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12258                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12259                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12260                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12261 #if defined(SCTP_DETAILED_STR_STATS)
12262                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12263                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12264                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12265                         }
12266 #else
12267                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12268                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12269 #endif
12270                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12271                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12272                         stcb->asoc.strmout[i].sid = i;
12273                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12274                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12275                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12276                 }
12277                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12278                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12279                 SCTP_TCB_SEND_UNLOCK(stcb);
12280         }
12281 skip_stuff:
12282         if ((add_stream & 1) && (adding_o > 0)) {
12283                 asoc->strm_pending_add_size = adding_o;
12284                 asoc->peer_req_out = peer_asked;
12285                 sctp_add_an_out_stream(chk, seq, adding_o);
12286                 seq++;
12287                 asoc->stream_reset_outstanding++;
12288         }
12289         if ((add_stream & 2) && (adding_i > 0)) {
12290                 sctp_add_an_in_stream(chk, seq, adding_i);
12291                 seq++;
12292                 asoc->stream_reset_outstanding++;
12293         }
12294         if (send_in_req) {
12295                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12296                 seq++;
12297                 asoc->stream_reset_outstanding++;
12298         }
12299         if (send_tsn_req) {
12300                 sctp_add_stream_reset_tsn(chk, seq);
12301                 asoc->stream_reset_outstanding++;
12302         }
12303         asoc->str_reset = chk;
12304         /* insert the chunk for sending */
12305         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12306             chk,
12307             sctp_next);
12308         asoc->ctrl_queue_cnt++;
12309         if (stcb->asoc.send_sack) {
12310                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12311         }
12312         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12313         return (0);
12314 }
12315
12316 void
12317 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12318     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12319     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12320     uint32_t vrf_id, uint16_t port)
12321 {
12322         /* Don't respond to an ABORT with an ABORT. */
12323         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12324                 if (cause)
12325                         sctp_m_freem(cause);
12326                 return;
12327         }
12328         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12329             mflowtype, mflowid, fibnum,
12330             vrf_id, port);
12331         return;
12332 }
12333
12334 void
12335 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12336     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12337     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12338     uint32_t vrf_id, uint16_t port)
12339 {
12340         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12341             mflowtype, mflowid, fibnum,
12342             vrf_id, port);
12343         return;
12344 }
12345
12346 static struct mbuf *
12347 sctp_copy_resume(struct uio *uio,
12348     int max_send_len,
12349     int user_marks_eor,
12350     int *error,
12351     uint32_t *sndout,
12352     struct mbuf **new_tail)
12353 {
12354         struct mbuf *m;
12355
12356         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12357             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12358         if (m == NULL) {
12359                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12360                 *error = ENOBUFS;
12361         } else {
12362                 *sndout = m_length(m, NULL);
12363                 *new_tail = m_last(m);
12364         }
12365         return (m);
12366 }
12367
12368 static int
12369 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12370     struct uio *uio,
12371     int resv_upfront)
12372 {
12373         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12374             resv_upfront, 0);
12375         if (sp->data == NULL) {
12376                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12377                 return (ENOBUFS);
12378         }
12379         sp->tail_mbuf = m_last(sp->data);
12380         return (0);
12381 }
12382
12383
12384
12385 static struct sctp_stream_queue_pending *
12386 sctp_copy_it_in(struct sctp_tcb *stcb,
12387     struct sctp_association *asoc,
12388     struct sctp_sndrcvinfo *srcv,
12389     struct uio *uio,
12390     struct sctp_nets *net,
12391     int max_send_len,
12392     int user_marks_eor,
12393     int *error)
12394 {
12395         /*-
12396          * This routine must be very careful in its work. Protocol
12397          * processing is up and running so care must be taken to spl...()
12398          * when you need to do something that may effect the stcb/asoc. The
12399          * sb is locked however. When data is copied the protocol processing
12400          * should be enabled since this is a slower operation...
12401          */
12402         struct sctp_stream_queue_pending *sp = NULL;
12403         int resv_in_first;
12404
12405         *error = 0;
12406         /* Now can we send this? */
12407         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12408             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12409             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12410             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12411                 /* got data while shutting down */
12412                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12413                 *error = ECONNRESET;
12414                 goto out_now;
12415         }
12416         sctp_alloc_a_strmoq(stcb, sp);
12417         if (sp == NULL) {
12418                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12419                 *error = ENOMEM;
12420                 goto out_now;
12421         }
12422         sp->act_flags = 0;
12423         sp->sender_all_done = 0;
12424         sp->sinfo_flags = srcv->sinfo_flags;
12425         sp->timetolive = srcv->sinfo_timetolive;
12426         sp->ppid = srcv->sinfo_ppid;
12427         sp->context = srcv->sinfo_context;
12428         sp->fsn = 0;
12429         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12430
12431         sp->sid = srcv->sinfo_stream;
12432         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12433         if ((sp->length == (uint32_t)uio->uio_resid) &&
12434             ((user_marks_eor == 0) ||
12435             (srcv->sinfo_flags & SCTP_EOF) ||
12436             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12437                 sp->msg_is_complete = 1;
12438         } else {
12439                 sp->msg_is_complete = 0;
12440         }
12441         sp->sender_all_done = 0;
12442         sp->some_taken = 0;
12443         sp->put_last_out = 0;
12444         resv_in_first = sizeof(struct sctp_data_chunk);
12445         sp->data = sp->tail_mbuf = NULL;
12446         if (sp->length == 0) {
12447                 *error = 0;
12448                 goto skip_copy;
12449         }
12450         if (srcv->sinfo_keynumber_valid) {
12451                 sp->auth_keyid = srcv->sinfo_keynumber;
12452         } else {
12453                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12454         }
12455         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12456                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12457                 sp->holds_key_ref = 1;
12458         }
12459         *error = sctp_copy_one(sp, uio, resv_in_first);
12460 skip_copy:
12461         if (*error) {
12462                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12463                 sp = NULL;
12464         } else {
12465                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12466                         sp->net = net;
12467                         atomic_add_int(&sp->net->ref_count, 1);
12468                 } else {
12469                         sp->net = NULL;
12470                 }
12471                 sctp_set_prsctp_policy(sp);
12472         }
12473 out_now:
12474         return (sp);
12475 }
12476
12477
12478 int
12479 sctp_sosend(struct socket *so,
12480     struct sockaddr *addr,
12481     struct uio *uio,
12482     struct mbuf *top,
12483     struct mbuf *control,
12484     int flags,
12485     struct thread *p
12486 )
12487 {
12488         int error, use_sndinfo = 0;
12489         struct sctp_sndrcvinfo sndrcvninfo;
12490         struct sockaddr *addr_to_use;
12491 #if defined(INET) && defined(INET6)
12492         struct sockaddr_in sin;
12493 #endif
12494
12495         if (control) {
12496                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12497                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12498                     sizeof(sndrcvninfo))) {
12499                         /* got one */
12500                         use_sndinfo = 1;
12501                 }
12502         }
12503         addr_to_use = addr;
12504 #if defined(INET) && defined(INET6)
12505         if ((addr) && (addr->sa_family == AF_INET6)) {
12506                 struct sockaddr_in6 *sin6;
12507
12508                 sin6 = (struct sockaddr_in6 *)addr;
12509                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12510                         in6_sin6_2_sin(&sin, sin6);
12511                         addr_to_use = (struct sockaddr *)&sin;
12512                 }
12513         }
12514 #endif
12515         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12516             control,
12517             flags,
12518             use_sndinfo ? &sndrcvninfo : NULL
12519             ,p
12520             );
12521         return (error);
12522 }
12523
12524
12525 int
12526 sctp_lower_sosend(struct socket *so,
12527     struct sockaddr *addr,
12528     struct uio *uio,
12529     struct mbuf *i_pak,
12530     struct mbuf *control,
12531     int flags,
12532     struct sctp_sndrcvinfo *srcv
12533     ,
12534     struct thread *p
12535 )
12536 {
12537         unsigned int sndlen = 0, max_len;
12538         int error, len;
12539         struct mbuf *top = NULL;
12540         int queue_only = 0, queue_only_for_init = 0;
12541         int free_cnt_applied = 0;
12542         int un_sent;
12543         int now_filled = 0;
12544         unsigned int inqueue_bytes = 0;
12545         struct sctp_block_entry be;
12546         struct sctp_inpcb *inp;
12547         struct sctp_tcb *stcb = NULL;
12548         struct timeval now;
12549         struct sctp_nets *net;
12550         struct sctp_association *asoc;
12551         struct sctp_inpcb *t_inp;
12552         int user_marks_eor;
12553         int create_lock_applied = 0;
12554         int nagle_applies = 0;
12555         int some_on_control = 0;
12556         int got_all_of_the_send = 0;
12557         int hold_tcblock = 0;
12558         int non_blocking = 0;
12559         uint32_t local_add_more, local_soresv = 0;
12560         uint16_t port;
12561         uint16_t sinfo_flags;
12562         sctp_assoc_t sinfo_assoc_id;
12563
12564         error = 0;
12565         net = NULL;
12566         stcb = NULL;
12567         asoc = NULL;
12568
12569         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12570         if (inp == NULL) {
12571                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12572                 error = EINVAL;
12573                 if (i_pak) {
12574                         SCTP_RELEASE_PKT(i_pak);
12575                 }
12576                 return (error);
12577         }
12578         if ((uio == NULL) && (i_pak == NULL)) {
12579                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12580                 return (EINVAL);
12581         }
12582         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12583         atomic_add_int(&inp->total_sends, 1);
12584         if (uio) {
12585                 if (uio->uio_resid < 0) {
12586                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12587                         return (EINVAL);
12588                 }
12589                 sndlen = (unsigned int)uio->uio_resid;
12590         } else {
12591                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12592                 sndlen = SCTP_HEADER_LEN(i_pak);
12593         }
12594         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12595             (void *)addr,
12596             sndlen);
12597         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12598             (inp->sctp_socket->so_qlimit)) {
12599                 /* The listener can NOT send */
12600                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12601                 error = ENOTCONN;
12602                 goto out_unlocked;
12603         }
12604         /**
12605          * Pre-screen address, if one is given the sin-len
12606          * must be set correctly!
12607          */
12608         if (addr) {
12609                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12610
12611                 switch (raddr->sa.sa_family) {
12612 #ifdef INET
12613                 case AF_INET:
12614                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12615                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12616                                 error = EINVAL;
12617                                 goto out_unlocked;
12618                         }
12619                         port = raddr->sin.sin_port;
12620                         break;
12621 #endif
12622 #ifdef INET6
12623                 case AF_INET6:
12624                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12625                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626                                 error = EINVAL;
12627                                 goto out_unlocked;
12628                         }
12629                         port = raddr->sin6.sin6_port;
12630                         break;
12631 #endif
12632                 default:
12633                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12634                         error = EAFNOSUPPORT;
12635                         goto out_unlocked;
12636                 }
12637         } else
12638                 port = 0;
12639
12640         if (srcv) {
12641                 sinfo_flags = srcv->sinfo_flags;
12642                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12643                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12644                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12645                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12646                         error = EINVAL;
12647                         goto out_unlocked;
12648                 }
12649                 if (srcv->sinfo_flags)
12650                         SCTP_STAT_INCR(sctps_sends_with_flags);
12651         } else {
12652                 sinfo_flags = inp->def_send.sinfo_flags;
12653                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12654         }
12655         if (sinfo_flags & SCTP_SENDALL) {
12656                 /* its a sendall */
12657                 error = sctp_sendall(inp, uio, top, srcv);
12658                 top = NULL;
12659                 goto out_unlocked;
12660         }
12661         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12662                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12663                 error = EINVAL;
12664                 goto out_unlocked;
12665         }
12666         /* now we must find the assoc */
12667         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12668             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12669                 SCTP_INP_RLOCK(inp);
12670                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12671                 if (stcb) {
12672                         SCTP_TCB_LOCK(stcb);
12673                         hold_tcblock = 1;
12674                 }
12675                 SCTP_INP_RUNLOCK(inp);
12676         } else if (sinfo_assoc_id) {
12677                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12678                 if (stcb != NULL) {
12679                         hold_tcblock = 1;
12680                 }
12681         } else if (addr) {
12682                 /*-
12683                  * Since we did not use findep we must
12684                  * increment it, and if we don't find a tcb
12685                  * decrement it.
12686                  */
12687                 SCTP_INP_WLOCK(inp);
12688                 SCTP_INP_INCR_REF(inp);
12689                 SCTP_INP_WUNLOCK(inp);
12690                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12691                 if (stcb == NULL) {
12692                         SCTP_INP_WLOCK(inp);
12693                         SCTP_INP_DECR_REF(inp);
12694                         SCTP_INP_WUNLOCK(inp);
12695                 } else {
12696                         hold_tcblock = 1;
12697                 }
12698         }
12699         if ((stcb == NULL) && (addr)) {
12700                 /* Possible implicit send? */
12701                 SCTP_ASOC_CREATE_LOCK(inp);
12702                 create_lock_applied = 1;
12703                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12704                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12705                         /* Should I really unlock ? */
12706                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12707                         error = EINVAL;
12708                         goto out_unlocked;
12709
12710                 }
12711                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12712                     (addr->sa_family == AF_INET6)) {
12713                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714                         error = EINVAL;
12715                         goto out_unlocked;
12716                 }
12717                 SCTP_INP_WLOCK(inp);
12718                 SCTP_INP_INCR_REF(inp);
12719                 SCTP_INP_WUNLOCK(inp);
12720                 /* With the lock applied look again */
12721                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12722                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12723                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12724                 }
12725                 if (stcb == NULL) {
12726                         SCTP_INP_WLOCK(inp);
12727                         SCTP_INP_DECR_REF(inp);
12728                         SCTP_INP_WUNLOCK(inp);
12729                 } else {
12730                         hold_tcblock = 1;
12731                 }
12732                 if (error) {
12733                         goto out_unlocked;
12734                 }
12735                 if (t_inp != inp) {
12736                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12737                         error = ENOTCONN;
12738                         goto out_unlocked;
12739                 }
12740         }
12741         if (stcb == NULL) {
12742                 if (addr == NULL) {
12743                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12744                         error = ENOENT;
12745                         goto out_unlocked;
12746                 } else {
12747                         /* We must go ahead and start the INIT process */
12748                         uint32_t vrf_id;
12749
12750                         if ((sinfo_flags & SCTP_ABORT) ||
12751                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12752                                 /*-
12753                                  * User asks to abort a non-existant assoc,
12754                                  * or EOF a non-existant assoc with no data
12755                                  */
12756                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12757                                 error = ENOENT;
12758                                 goto out_unlocked;
12759                         }
12760                         /* get an asoc/stcb struct */
12761                         vrf_id = inp->def_vrf_id;
12762 #ifdef INVARIANTS
12763                         if (create_lock_applied == 0) {
12764                                 panic("Error, should hold create lock and I don't?");
12765                         }
12766 #endif
12767                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12768                             inp->sctp_ep.pre_open_stream_count,
12769                             inp->sctp_ep.port,
12770                             p);
12771                         if (stcb == NULL) {
12772                                 /* Error is setup for us in the call */
12773                                 goto out_unlocked;
12774                         }
12775                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12776                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12777                                 /*
12778                                  * Set the connected flag so we can queue
12779                                  * data
12780                                  */
12781                                 soisconnecting(so);
12782                         }
12783                         hold_tcblock = 1;
12784                         if (create_lock_applied) {
12785                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12786                                 create_lock_applied = 0;
12787                         } else {
12788                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12789                         }
12790                         /*
12791                          * Turn on queue only flag to prevent data from
12792                          * being sent
12793                          */
12794                         queue_only = 1;
12795                         asoc = &stcb->asoc;
12796                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12797                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12798
12799                         /* initialize authentication params for the assoc */
12800                         sctp_initialize_auth_params(inp, stcb);
12801
12802                         if (control) {
12803                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12804                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12805                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12806                                         hold_tcblock = 0;
12807                                         stcb = NULL;
12808                                         goto out_unlocked;
12809                                 }
12810                         }
12811                         /* out with the INIT */
12812                         queue_only_for_init = 1;
12813                         /*-
12814                          * we may want to dig in after this call and adjust the MTU
12815                          * value. It defaulted to 1500 (constant) but the ro
12816                          * structure may now have an update and thus we may need to
12817                          * change it BEFORE we append the message.
12818                          */
12819                 }
12820         } else
12821                 asoc = &stcb->asoc;
12822         if (srcv == NULL)
12823                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12824         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12825                 if (addr)
12826                         net = sctp_findnet(stcb, addr);
12827                 else
12828                         net = NULL;
12829                 if ((net == NULL) ||
12830                     ((port != 0) && (port != stcb->rport))) {
12831                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12832                         error = EINVAL;
12833                         goto out_unlocked;
12834                 }
12835         } else {
12836                 if (stcb->asoc.alternate) {
12837                         net = stcb->asoc.alternate;
12838                 } else {
12839                         net = stcb->asoc.primary_destination;
12840                 }
12841         }
12842         atomic_add_int(&stcb->total_sends, 1);
12843         /* Keep the stcb from being freed under our feet */
12844         atomic_add_int(&asoc->refcnt, 1);
12845         free_cnt_applied = 1;
12846
12847         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12848                 if (sndlen > asoc->smallest_mtu) {
12849                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12850                         error = EMSGSIZE;
12851                         goto out_unlocked;
12852                 }
12853         }
12854         if (SCTP_SO_IS_NBIO(so)
12855             || (flags & MSG_NBIO)
12856             ) {
12857                 non_blocking = 1;
12858         }
12859         /* would we block? */
12860         if (non_blocking) {
12861                 if (hold_tcblock == 0) {
12862                         SCTP_TCB_LOCK(stcb);
12863                         hold_tcblock = 1;
12864                 }
12865                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12866                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12867                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12868                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12869                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12870                                 error = EMSGSIZE;
12871                         else
12872                                 error = EWOULDBLOCK;
12873                         goto out_unlocked;
12874                 }
12875                 stcb->asoc.sb_send_resv += sndlen;
12876                 SCTP_TCB_UNLOCK(stcb);
12877                 hold_tcblock = 0;
12878         } else {
12879                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12880         }
12881         local_soresv = sndlen;
12882         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12883                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12884                 error = ECONNRESET;
12885                 goto out_unlocked;
12886         }
12887         if (create_lock_applied) {
12888                 SCTP_ASOC_CREATE_UNLOCK(inp);
12889                 create_lock_applied = 0;
12890         }
12891         /* Is the stream no. valid? */
12892         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12893                 /* Invalid stream number */
12894                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12895                 error = EINVAL;
12896                 goto out_unlocked;
12897         }
12898         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12899             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12900                 /*
12901                  * Can't queue any data while stream reset is underway.
12902                  */
12903                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12904                         error = EAGAIN;
12905                 } else {
12906                         error = EINVAL;
12907                 }
12908                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12909                 goto out_unlocked;
12910         }
12911         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12912             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12913                 queue_only = 1;
12914         }
12915         /* we are now done with all control */
12916         if (control) {
12917                 sctp_m_freem(control);
12918                 control = NULL;
12919         }
12920         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12921             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12922             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12923             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12924                 if (srcv->sinfo_flags & SCTP_ABORT) {
12925                         ;
12926                 } else {
12927                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12928                         error = ECONNRESET;
12929                         goto out_unlocked;
12930                 }
12931         }
12932         /* Ok, we will attempt a msgsnd :> */
12933         if (p) {
12934                 p->td_ru.ru_msgsnd++;
12935         }
12936         /* Are we aborting? */
12937         if (srcv->sinfo_flags & SCTP_ABORT) {
12938                 struct mbuf *mm;
12939                 int tot_demand, tot_out = 0, max_out;
12940
12941                 SCTP_STAT_INCR(sctps_sends_with_abort);
12942                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12943                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12944                         /* It has to be up before we abort */
12945                         /* how big is the user initiated abort? */
12946                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12947                         error = EINVAL;
12948                         goto out;
12949                 }
12950                 if (hold_tcblock) {
12951                         SCTP_TCB_UNLOCK(stcb);
12952                         hold_tcblock = 0;
12953                 }
12954                 if (top) {
12955                         struct mbuf *cntm = NULL;
12956
12957                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12958                         if (sndlen != 0) {
12959                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12960                                         tot_out += SCTP_BUF_LEN(cntm);
12961                                 }
12962                         }
12963                 } else {
12964                         /* Must fit in a MTU */
12965                         tot_out = sndlen;
12966                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12967                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12968                                 /* To big */
12969                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12970                                 error = EMSGSIZE;
12971                                 goto out;
12972                         }
12973                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12974                 }
12975                 if (mm == NULL) {
12976                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12977                         error = ENOMEM;
12978                         goto out;
12979                 }
12980                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12981                 max_out -= sizeof(struct sctp_abort_msg);
12982                 if (tot_out > max_out) {
12983                         tot_out = max_out;
12984                 }
12985                 if (mm) {
12986                         struct sctp_paramhdr *ph;
12987
12988                         /* now move forward the data pointer */
12989                         ph = mtod(mm, struct sctp_paramhdr *);
12990                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12991                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12992                         ph++;
12993                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12994                         if (top == NULL) {
12995                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12996                                 if (error) {
12997                                         /*-
12998                                          * Here if we can't get his data we
12999                                          * still abort we just don't get to
13000                                          * send the users note :-0
13001                                          */
13002                                         sctp_m_freem(mm);
13003                                         mm = NULL;
13004                                 }
13005                         } else {
13006                                 if (sndlen != 0) {
13007                                         SCTP_BUF_NEXT(mm) = top;
13008                                 }
13009                         }
13010                 }
13011                 if (hold_tcblock == 0) {
13012                         SCTP_TCB_LOCK(stcb);
13013                 }
13014                 atomic_add_int(&stcb->asoc.refcnt, -1);
13015                 free_cnt_applied = 0;
13016                 /* release this lock, otherwise we hang on ourselves */
13017                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13018                 /* now relock the stcb so everything is sane */
13019                 hold_tcblock = 0;
13020                 stcb = NULL;
13021                 /*
13022                  * In this case top is already chained to mm avoid double
13023                  * free, since we free it below if top != NULL and driver
13024                  * would free it after sending the packet out
13025                  */
13026                 if (sndlen != 0) {
13027                         top = NULL;
13028                 }
13029                 goto out_unlocked;
13030         }
13031         /* Calculate the maximum we can send */
13032         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13033         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13034                 if (non_blocking) {
13035                         /* we already checked for non-blocking above. */
13036                         max_len = sndlen;
13037                 } else {
13038                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13039                 }
13040         } else {
13041                 max_len = 0;
13042         }
13043         if (hold_tcblock) {
13044                 SCTP_TCB_UNLOCK(stcb);
13045                 hold_tcblock = 0;
13046         }
13047         if (asoc->strmout == NULL) {
13048                 /* huh? software error */
13049                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13050                 error = EFAULT;
13051                 goto out_unlocked;
13052         }
13053         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13054         if ((user_marks_eor == 0) &&
13055             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13056                 /* It will NEVER fit */
13057                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13058                 error = EMSGSIZE;
13059                 goto out_unlocked;
13060         }
13061         if ((uio == NULL) && user_marks_eor) {
13062                 /*-
13063                  * We do not support eeor mode for
13064                  * sending with mbuf chains (like sendfile).
13065                  */
13066                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13067                 error = EINVAL;
13068                 goto out_unlocked;
13069         }
13070         if (user_marks_eor) {
13071                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13072         } else {
13073                 /*-
13074                  * For non-eeor the whole message must fit in
13075                  * the socket send buffer.
13076                  */
13077                 local_add_more = sndlen;
13078         }
13079         len = 0;
13080         if (non_blocking) {
13081                 goto skip_preblock;
13082         }
13083         if (((max_len <= local_add_more) &&
13084             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13085             (max_len == 0) ||
13086             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13087                 /* No room right now ! */
13088                 SOCKBUF_LOCK(&so->so_snd);
13089                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13090                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13091                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13092                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13093                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13094                             inqueue_bytes,
13095                             local_add_more,
13096                             stcb->asoc.stream_queue_cnt,
13097                             stcb->asoc.chunks_on_out_queue,
13098                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13099                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13100                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13101                         }
13102                         be.error = 0;
13103                         stcb->block_entry = &be;
13104                         error = sbwait(&so->so_snd);
13105                         stcb->block_entry = NULL;
13106                         if (error || so->so_error || be.error) {
13107                                 if (error == 0) {
13108                                         if (so->so_error)
13109                                                 error = so->so_error;
13110                                         if (be.error) {
13111                                                 error = be.error;
13112                                         }
13113                                 }
13114                                 SOCKBUF_UNLOCK(&so->so_snd);
13115                                 goto out_unlocked;
13116                         }
13117                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13118                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13119                                     asoc, stcb->asoc.total_output_queue_size);
13120                         }
13121                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13122                                 SOCKBUF_UNLOCK(&so->so_snd);
13123                                 goto out_unlocked;
13124                         }
13125                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13126                 }
13127                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13128                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13129                 } else {
13130                         max_len = 0;
13131                 }
13132                 SOCKBUF_UNLOCK(&so->so_snd);
13133         }
13134 skip_preblock:
13135         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13136                 goto out_unlocked;
13137         }
13138         /*
13139          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13140          * case NOTE: uio will be null when top/mbuf is passed
13141          */
13142         if (sndlen == 0) {
13143                 if (srcv->sinfo_flags & SCTP_EOF) {
13144                         got_all_of_the_send = 1;
13145                         goto dataless_eof;
13146                 } else {
13147                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13148                         error = EINVAL;
13149                         goto out;
13150                 }
13151         }
13152         if (top == NULL) {
13153                 struct sctp_stream_queue_pending *sp;
13154                 struct sctp_stream_out *strm;
13155                 uint32_t sndout;
13156
13157                 SCTP_TCB_SEND_LOCK(stcb);
13158                 if ((asoc->stream_locked) &&
13159                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13160                         SCTP_TCB_SEND_UNLOCK(stcb);
13161                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13162                         error = EINVAL;
13163                         goto out;
13164                 }
13165                 SCTP_TCB_SEND_UNLOCK(stcb);
13166
13167                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13168                 if (strm->last_msg_incomplete == 0) {
13169         do_a_copy_in:
13170                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13171                         if ((sp == NULL) || (error)) {
13172                                 goto out;
13173                         }
13174                         SCTP_TCB_SEND_LOCK(stcb);
13175                         if (sp->msg_is_complete) {
13176                                 strm->last_msg_incomplete = 0;
13177                                 asoc->stream_locked = 0;
13178                         } else {
13179                                 /*
13180                                  * Just got locked to this guy in case of an
13181                                  * interrupt.
13182                                  */
13183                                 strm->last_msg_incomplete = 1;
13184                                 if (stcb->asoc.idata_supported == 0) {
13185                                         asoc->stream_locked = 1;
13186                                         asoc->stream_locked_on = srcv->sinfo_stream;
13187                                 }
13188                                 sp->sender_all_done = 0;
13189                         }
13190                         sctp_snd_sb_alloc(stcb, sp->length);
13191                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13192                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13193                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13194                         }
13195                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13196                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13197                         SCTP_TCB_SEND_UNLOCK(stcb);
13198                 } else {
13199                         SCTP_TCB_SEND_LOCK(stcb);
13200                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13201                         SCTP_TCB_SEND_UNLOCK(stcb);
13202                         if (sp == NULL) {
13203                                 /* ???? Huh ??? last msg is gone */
13204 #ifdef INVARIANTS
13205                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13206 #else
13207                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13208                                 strm->last_msg_incomplete = 0;
13209 #endif
13210                                 goto do_a_copy_in;
13211
13212                         }
13213                 }
13214                 while (uio->uio_resid > 0) {
13215                         /* How much room do we have? */
13216                         struct mbuf *new_tail, *mm;
13217
13218                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13219                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13220                         else
13221                                 max_len = 0;
13222
13223                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13224                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13225                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13226                                 sndout = 0;
13227                                 new_tail = NULL;
13228                                 if (hold_tcblock) {
13229                                         SCTP_TCB_UNLOCK(stcb);
13230                                         hold_tcblock = 0;
13231                                 }
13232                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13233                                 if ((mm == NULL) || error) {
13234                                         if (mm) {
13235                                                 sctp_m_freem(mm);
13236                                         }
13237                                         goto out;
13238                                 }
13239                                 /* Update the mbuf and count */
13240                                 SCTP_TCB_SEND_LOCK(stcb);
13241                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13242                                         /*
13243                                          * we need to get out. Peer probably
13244                                          * aborted.
13245                                          */
13246                                         sctp_m_freem(mm);
13247                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13248                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13249                                                 error = ECONNRESET;
13250                                         }
13251                                         SCTP_TCB_SEND_UNLOCK(stcb);
13252                                         goto out;
13253                                 }
13254                                 if (sp->tail_mbuf) {
13255                                         /* tack it to the end */
13256                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13257                                         sp->tail_mbuf = new_tail;
13258                                 } else {
13259                                         /* A stolen mbuf */
13260                                         sp->data = mm;
13261                                         sp->tail_mbuf = new_tail;
13262                                 }
13263                                 sctp_snd_sb_alloc(stcb, sndout);
13264                                 atomic_add_int(&sp->length, sndout);
13265                                 len += sndout;
13266                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13267                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13268                                 }
13269                                 /* Did we reach EOR? */
13270                                 if ((uio->uio_resid == 0) &&
13271                                     ((user_marks_eor == 0) ||
13272                                     (srcv->sinfo_flags & SCTP_EOF) ||
13273                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13274                                         sp->msg_is_complete = 1;
13275                                 } else {
13276                                         sp->msg_is_complete = 0;
13277                                 }
13278                                 SCTP_TCB_SEND_UNLOCK(stcb);
13279                         }
13280                         if (uio->uio_resid == 0) {
13281                                 /* got it all? */
13282                                 continue;
13283                         }
13284                         /* PR-SCTP? */
13285                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13286                                 /*
13287                                  * This is ugly but we must assure locking
13288                                  * order
13289                                  */
13290                                 if (hold_tcblock == 0) {
13291                                         SCTP_TCB_LOCK(stcb);
13292                                         hold_tcblock = 1;
13293                                 }
13294                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13295                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13296                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13297                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13298                                 else
13299                                         max_len = 0;
13300                                 if (max_len > 0) {
13301                                         continue;
13302                                 }
13303                                 SCTP_TCB_UNLOCK(stcb);
13304                                 hold_tcblock = 0;
13305                         }
13306                         /* wait for space now */
13307                         if (non_blocking) {
13308                                 /* Non-blocking io in place out */
13309                                 goto skip_out_eof;
13310                         }
13311                         /* What about the INIT, send it maybe */
13312                         if (queue_only_for_init) {
13313                                 if (hold_tcblock == 0) {
13314                                         SCTP_TCB_LOCK(stcb);
13315                                         hold_tcblock = 1;
13316                                 }
13317                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13318                                         /* a collision took us forward? */
13319                                         queue_only = 0;
13320                                 } else {
13321                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13322                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13323                                         queue_only = 1;
13324                                 }
13325                         }
13326                         if ((net->flight_size > net->cwnd) &&
13327                             (asoc->sctp_cmt_on_off == 0)) {
13328                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13329                                 queue_only = 1;
13330                         } else if (asoc->ifp_had_enobuf) {
13331                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13332                                 if (net->flight_size > (2 * net->mtu)) {
13333                                         queue_only = 1;
13334                                 }
13335                                 asoc->ifp_had_enobuf = 0;
13336                         }
13337                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13338                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13339                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13340                             (stcb->asoc.total_flight > 0) &&
13341                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13342                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13343
13344                                 /*-
13345                                  * Ok, Nagle is set on and we have data outstanding.
13346                                  * Don't send anything and let SACKs drive out the
13347                                  * data unless we have a "full" segment to send.
13348                                  */
13349                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13350                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13351                                 }
13352                                 SCTP_STAT_INCR(sctps_naglequeued);
13353                                 nagle_applies = 1;
13354                         } else {
13355                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13356                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13357                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13358                                 }
13359                                 SCTP_STAT_INCR(sctps_naglesent);
13360                                 nagle_applies = 0;
13361                         }
13362                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13363
13364                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13365                                     nagle_applies, un_sent);
13366                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13367                                     stcb->asoc.total_flight,
13368                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13369                         }
13370                         if (queue_only_for_init)
13371                                 queue_only_for_init = 0;
13372                         if ((queue_only == 0) && (nagle_applies == 0)) {
13373                                 /*-
13374                                  * need to start chunk output
13375                                  * before blocking.. note that if
13376                                  * a lock is already applied, then
13377                                  * the input via the net is happening
13378                                  * and I don't need to start output :-D
13379                                  */
13380                                 if (hold_tcblock == 0) {
13381                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13382                                                 hold_tcblock = 1;
13383                                                 sctp_chunk_output(inp,
13384                                                     stcb,
13385                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13386                                         }
13387                                 } else {
13388                                         sctp_chunk_output(inp,
13389                                             stcb,
13390                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13391                                 }
13392                                 if (hold_tcblock == 1) {
13393                                         SCTP_TCB_UNLOCK(stcb);
13394                                         hold_tcblock = 0;
13395                                 }
13396                         }
13397                         SOCKBUF_LOCK(&so->so_snd);
13398                         /*-
13399                          * This is a bit strange, but I think it will
13400                          * work. The total_output_queue_size is locked and
13401                          * protected by the TCB_LOCK, which we just released.
13402                          * There is a race that can occur between releasing it
13403                          * above, and me getting the socket lock, where sacks
13404                          * come in but we have not put the SB_WAIT on the
13405                          * so_snd buffer to get the wakeup. After the LOCK
13406                          * is applied the sack_processing will also need to
13407                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13408                          * once we have the socket buffer lock if we recheck the
13409                          * size we KNOW we will get to sleep safely with the
13410                          * wakeup flag in place.
13411                          */
13412                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13413                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13414                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13415                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13416                                             asoc, (size_t)uio->uio_resid);
13417                                 }
13418                                 be.error = 0;
13419                                 stcb->block_entry = &be;
13420                                 error = sbwait(&so->so_snd);
13421                                 stcb->block_entry = NULL;
13422
13423                                 if (error || so->so_error || be.error) {
13424                                         if (error == 0) {
13425                                                 if (so->so_error)
13426                                                         error = so->so_error;
13427                                                 if (be.error) {
13428                                                         error = be.error;
13429                                                 }
13430                                         }
13431                                         SOCKBUF_UNLOCK(&so->so_snd);
13432                                         goto out_unlocked;
13433                                 }
13434                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13435                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13436                                             asoc, stcb->asoc.total_output_queue_size);
13437                                 }
13438                         }
13439                         SOCKBUF_UNLOCK(&so->so_snd);
13440                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13441                                 goto out_unlocked;
13442                         }
13443                 }
13444                 SCTP_TCB_SEND_LOCK(stcb);
13445                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13446                         SCTP_TCB_SEND_UNLOCK(stcb);
13447                         goto out_unlocked;
13448                 }
13449                 if (sp) {
13450                         if (sp->msg_is_complete == 0) {
13451                                 strm->last_msg_incomplete = 1;
13452                                 if (stcb->asoc.idata_supported == 0) {
13453                                         asoc->stream_locked = 1;
13454                                         asoc->stream_locked_on = srcv->sinfo_stream;
13455                                 }
13456                         } else {
13457                                 sp->sender_all_done = 1;
13458                                 strm->last_msg_incomplete = 0;
13459                                 asoc->stream_locked = 0;
13460                         }
13461                 } else {
13462                         SCTP_PRINTF("Huh no sp TSNH?\n");
13463                         strm->last_msg_incomplete = 0;
13464                         asoc->stream_locked = 0;
13465                 }
13466                 SCTP_TCB_SEND_UNLOCK(stcb);
13467                 if (uio->uio_resid == 0) {
13468                         got_all_of_the_send = 1;
13469                 }
13470         } else {
13471                 /* We send in a 0, since we do NOT have any locks */
13472                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13473                 top = NULL;
13474                 if (srcv->sinfo_flags & SCTP_EOF) {
13475                         /*
13476                          * This should only happen for Panda for the mbuf
13477                          * send case, which does NOT yet support EEOR mode.
13478                          * Thus, we can just set this flag to do the proper
13479                          * EOF handling.
13480                          */
13481                         got_all_of_the_send = 1;
13482                 }
13483         }
13484         if (error) {
13485                 goto out;
13486         }
13487 dataless_eof:
13488         /* EOF thing ? */
13489         if ((srcv->sinfo_flags & SCTP_EOF) &&
13490             (got_all_of_the_send == 1)) {
13491                 SCTP_STAT_INCR(sctps_sends_with_eof);
13492                 error = 0;
13493                 if (hold_tcblock == 0) {
13494                         SCTP_TCB_LOCK(stcb);
13495                         hold_tcblock = 1;
13496                 }
13497                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13498                     TAILQ_EMPTY(&asoc->sent_queue) &&
13499                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13500                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13501                                 goto abort_anyway;
13502                         }
13503                         /* there is nothing queued to send, so I'm done... */
13504                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13505                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13506                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13507                                 struct sctp_nets *netp;
13508
13509                                 /* only send SHUTDOWN the first time through */
13510                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13511                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13512                                 }
13513                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13514                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13515                                 sctp_stop_timers_for_shutdown(stcb);
13516                                 if (stcb->asoc.alternate) {
13517                                         netp = stcb->asoc.alternate;
13518                                 } else {
13519                                         netp = stcb->asoc.primary_destination;
13520                                 }
13521                                 sctp_send_shutdown(stcb, netp);
13522                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13523                                     netp);
13524                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13525                                     asoc->primary_destination);
13526                         }
13527                 } else {
13528                         /*-
13529                          * we still got (or just got) data to send, so set
13530                          * SHUTDOWN_PENDING
13531                          */
13532                         /*-
13533                          * XXX sockets draft says that SCTP_EOF should be
13534                          * sent with no data.  currently, we will allow user
13535                          * data to be sent first and move to
13536                          * SHUTDOWN-PENDING
13537                          */
13538                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13539                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13540                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13541                                 if (hold_tcblock == 0) {
13542                                         SCTP_TCB_LOCK(stcb);
13543                                         hold_tcblock = 1;
13544                                 }
13545                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13546                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13547                                 }
13548                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13549                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13550                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13551                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13552                                         struct mbuf *op_err;
13553                                         char msg[SCTP_DIAG_INFO_LEN];
13554
13555                         abort_anyway:
13556                                         if (free_cnt_applied) {
13557                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13558                                                 free_cnt_applied = 0;
13559                                         }
13560                                         snprintf(msg, sizeof(msg),
13561                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13562                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13563                                             msg);
13564                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13565                                             op_err, SCTP_SO_LOCKED);
13566                                         /*
13567                                          * now relock the stcb so everything
13568                                          * is sane
13569                                          */
13570                                         hold_tcblock = 0;
13571                                         stcb = NULL;
13572                                         goto out;
13573                                 }
13574                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13575                                     asoc->primary_destination);
13576                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13577                         }
13578                 }
13579         }
13580 skip_out_eof:
13581         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13582                 some_on_control = 1;
13583         }
13584         if (queue_only_for_init) {
13585                 if (hold_tcblock == 0) {
13586                         SCTP_TCB_LOCK(stcb);
13587                         hold_tcblock = 1;
13588                 }
13589                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13590                         /* a collision took us forward? */
13591                         queue_only = 0;
13592                 } else {
13593                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13594                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13595                         queue_only = 1;
13596                 }
13597         }
13598         if ((net->flight_size > net->cwnd) &&
13599             (stcb->asoc.sctp_cmt_on_off == 0)) {
13600                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13601                 queue_only = 1;
13602         } else if (asoc->ifp_had_enobuf) {
13603                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13604                 if (net->flight_size > (2 * net->mtu)) {
13605                         queue_only = 1;
13606                 }
13607                 asoc->ifp_had_enobuf = 0;
13608         }
13609         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13610             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13611         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13612             (stcb->asoc.total_flight > 0) &&
13613             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13614             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13615                 /*-
13616                  * Ok, Nagle is set on and we have data outstanding.
13617                  * Don't send anything and let SACKs drive out the
13618                  * data unless wen have a "full" segment to send.
13619                  */
13620                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13621                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13622                 }
13623                 SCTP_STAT_INCR(sctps_naglequeued);
13624                 nagle_applies = 1;
13625         } else {
13626                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13627                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13628                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13629                 }
13630                 SCTP_STAT_INCR(sctps_naglesent);
13631                 nagle_applies = 0;
13632         }
13633         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13634                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13635                     nagle_applies, un_sent);
13636                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13637                     stcb->asoc.total_flight,
13638                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13639         }
13640         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13641                 /* we can attempt to send too. */
13642                 if (hold_tcblock == 0) {
13643                         /*
13644                          * If there is activity recv'ing sacks no need to
13645                          * send
13646                          */
13647                         if (SCTP_TCB_TRYLOCK(stcb)) {
13648                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13649                                 hold_tcblock = 1;
13650                         }
13651                 } else {
13652                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13653                 }
13654         } else if ((queue_only == 0) &&
13655                     (stcb->asoc.peers_rwnd == 0) &&
13656             (stcb->asoc.total_flight == 0)) {
13657                 /* We get to have a probe outstanding */
13658                 if (hold_tcblock == 0) {
13659                         hold_tcblock = 1;
13660                         SCTP_TCB_LOCK(stcb);
13661                 }
13662                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13663         } else if (some_on_control) {
13664                 int num_out, reason, frag_point;
13665
13666                 /* Here we do control only */
13667                 if (hold_tcblock == 0) {
13668                         hold_tcblock = 1;
13669                         SCTP_TCB_LOCK(stcb);
13670                 }
13671                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13672                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13673                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13674         }
13675         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13676             queue_only, stcb->asoc.peers_rwnd, un_sent,
13677             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13678             stcb->asoc.total_output_queue_size, error);
13679
13680 out:
13681 out_unlocked:
13682
13683         if (local_soresv && stcb) {
13684                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13685         }
13686         if (create_lock_applied) {
13687                 SCTP_ASOC_CREATE_UNLOCK(inp);
13688         }
13689         if ((stcb) && hold_tcblock) {
13690                 SCTP_TCB_UNLOCK(stcb);
13691         }
13692         if (stcb && free_cnt_applied) {
13693                 atomic_add_int(&stcb->asoc.refcnt, -1);
13694         }
13695 #ifdef INVARIANTS
13696         if (stcb) {
13697                 if (mtx_owned(&stcb->tcb_mtx)) {
13698                         panic("Leaving with tcb mtx owned?");
13699                 }
13700                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13701                         panic("Leaving with tcb send mtx owned?");
13702                 }
13703         }
13704 #endif
13705         if (top) {
13706                 sctp_m_freem(top);
13707         }
13708         if (control) {
13709                 sctp_m_freem(control);
13710         }
13711         return (error);
13712 }
13713
13714
13715 /*
13716  * generate an AUTHentication chunk, if required
13717  */
13718 struct mbuf *
13719 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13720     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13721     struct sctp_tcb *stcb, uint8_t chunk)
13722 {
13723         struct mbuf *m_auth;
13724         struct sctp_auth_chunk *auth;
13725         int chunk_len;
13726         struct mbuf *cn;
13727
13728         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13729             (stcb == NULL))
13730                 return (m);
13731
13732         if (stcb->asoc.auth_supported == 0) {
13733                 return (m);
13734         }
13735         /* does the requested chunk require auth? */
13736         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13737                 return (m);
13738         }
13739         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13740         if (m_auth == NULL) {
13741                 /* no mbuf's */
13742                 return (m);
13743         }
13744         /* reserve some space if this will be the first mbuf */
13745         if (m == NULL)
13746                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13747         /* fill in the AUTH chunk details */
13748         auth = mtod(m_auth, struct sctp_auth_chunk *);
13749         bzero(auth, sizeof(*auth));
13750         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13751         auth->ch.chunk_flags = 0;
13752         chunk_len = sizeof(*auth) +
13753             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13754         auth->ch.chunk_length = htons(chunk_len);
13755         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13756         /* key id and hmac digest will be computed and filled in upon send */
13757
13758         /* save the offset where the auth was inserted into the chain */
13759         *offset = 0;
13760         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13761                 *offset += SCTP_BUF_LEN(cn);
13762         }
13763
13764         /* update length and return pointer to the auth chunk */
13765         SCTP_BUF_LEN(m_auth) = chunk_len;
13766         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13767         if (auth_ret != NULL)
13768                 *auth_ret = auth;
13769
13770         return (m);
13771 }
13772
13773 #ifdef INET6
13774 int
13775 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13776 {
13777         struct nd_prefix *pfx = NULL;
13778         struct nd_pfxrouter *pfxrtr = NULL;
13779         struct sockaddr_in6 gw6;
13780
13781         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13782                 return (0);
13783
13784         /* get prefix entry of address */
13785         ND6_RLOCK();
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                 ND6_RUNLOCK();
13796                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13797                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13798                 return (0);
13799         }
13800         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13801         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13802
13803         /* search installed gateway from prefix entry */
13804         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13805                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13806                 gw6.sin6_family = AF_INET6;
13807                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13808                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13809                     sizeof(struct in6_addr));
13810                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13811                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13812                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13813                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13814                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13815                         ND6_RUNLOCK();
13816                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13817                         ND6_RUNLOCK();
13818                         return (1);
13819                 }
13820         }
13821         ND6_RUNLOCK();
13822         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13823         return (0);
13824 }
13825 #endif
13826
13827 int
13828 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13829 {
13830 #ifdef INET
13831         struct sockaddr_in *sin, *mask;
13832         struct ifaddr *ifa;
13833         struct in_addr srcnetaddr, gwnetaddr;
13834
13835         if (ro == NULL || ro->ro_rt == NULL ||
13836             sifa->address.sa.sa_family != AF_INET) {
13837                 return (0);
13838         }
13839         ifa = (struct ifaddr *)sifa->ifa;
13840         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13841         sin = &sifa->address.sin;
13842         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13843         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13844         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13845         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13846
13847         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13848         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13849         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13850         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13851         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13852         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13853                 return (1);
13854         }
13855 #endif
13856         return (0);
13857 }