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 *paramh;
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                 paramh = (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                 paramh = 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 *)paramh;
1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         paramh->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 *)paramh;
2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         paramh->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                         memset(&lsa6_tmp, 0, 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                         memset(&lsa6_storage, 0, 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                                         if (plen > sizeof(tempbuf)) {
5145                                                 plen = sizeof(tempbuf);
5146                                         }
5147                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5148                                         if (phdr == NULL) {
5149                                                 sctp_m_freem(op_err);
5150                                                 /*
5151                                                  * we are out of memory but
5152                                                  * we still need to have a
5153                                                  * look at what to do (the
5154                                                  * system is in trouble
5155                                                  * though).
5156                                                  */
5157                                                 return (NULL);
5158                                         }
5159                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5160                                 }
5161                                 return (op_err);
5162                                 break;
5163                         }
5164                 default:
5165                         /*
5166                          * we do not recognize the parameter figure out what
5167                          * we do.
5168                          */
5169                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5170                         if ((ptype & 0x4000) == 0x4000) {
5171                                 /* Report bit is set?? */
5172                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5173                                 if (op_err == NULL) {
5174                                         int l_len;
5175
5176                                         /* Ok need to try to get an mbuf */
5177 #ifdef INET6
5178                                         l_len = SCTP_MIN_OVERHEAD;
5179 #else
5180                                         l_len = SCTP_MIN_V4_OVERHEAD;
5181 #endif
5182                                         l_len += sizeof(struct sctp_chunkhdr);
5183                                         l_len += plen;
5184                                         l_len += sizeof(struct sctp_paramhdr);
5185                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5186                                         if (op_err) {
5187                                                 SCTP_BUF_LEN(op_err) = 0;
5188 #ifdef INET6
5189                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5190 #else
5191                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5192 #endif
5193                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5195                                         }
5196                                 }
5197                                 if (op_err) {
5198                                         /* If we have space */
5199                                         struct sctp_paramhdr s;
5200
5201                                         if (err_at % 4) {
5202                                                 uint32_t cpthis = 0;
5203
5204                                                 pad_needed = 4 - (err_at % 4);
5205                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5206                                                 err_at += pad_needed;
5207                                         }
5208                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5209                                         s.param_length = htons(sizeof(s) + plen);
5210                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5211                                         err_at += sizeof(s);
5212                                         if (plen > sizeof(tempbuf)) {
5213                                                 plen = sizeof(tempbuf);
5214                                         }
5215                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
5216                                         if (phdr == NULL) {
5217                                                 sctp_m_freem(op_err);
5218                                                 /*
5219                                                  * we are out of memory but
5220                                                  * we still need to have a
5221                                                  * look at what to do (the
5222                                                  * system is in trouble
5223                                                  * though).
5224                                                  */
5225                                                 op_err = NULL;
5226                                                 goto more_processing;
5227                                         }
5228                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5229                                         err_at += plen;
5230                                 }
5231                         }
5232         more_processing:
5233                         if ((ptype & 0x8000) == 0x0000) {
5234                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5235                                 return (op_err);
5236                         } else {
5237                                 /* skip this chunk and continue processing */
5238                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5239                                 at += SCTP_SIZE32(plen);
5240                         }
5241                         break;
5242
5243                 }
5244                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5245         }
5246         return (op_err);
5247 invalid_size:
5248         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5249         *abort_processing = 1;
5250         if ((op_err == NULL) && phdr) {
5251                 int l_len;
5252 #ifdef INET6
5253                 l_len = SCTP_MIN_OVERHEAD;
5254 #else
5255                 l_len = SCTP_MIN_V4_OVERHEAD;
5256 #endif
5257                 l_len += sizeof(struct sctp_chunkhdr);
5258                 l_len += (2 * sizeof(struct sctp_paramhdr));
5259                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5260                 if (op_err) {
5261                         SCTP_BUF_LEN(op_err) = 0;
5262 #ifdef INET6
5263                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5264 #else
5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5266 #endif
5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5269                 }
5270         }
5271         if ((op_err) && phdr) {
5272                 struct sctp_paramhdr s;
5273
5274                 if (err_at % 4) {
5275                         uint32_t cpthis = 0;
5276
5277                         pad_needed = 4 - (err_at % 4);
5278                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5279                         err_at += pad_needed;
5280                 }
5281                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5282                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5283                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5284                 err_at += sizeof(s);
5285                 /* Only copy back the p-hdr that caused the issue */
5286                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5287         }
5288         return (op_err);
5289 }
5290
5291 static int
5292 sctp_are_there_new_addresses(struct sctp_association *asoc,
5293     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5294 {
5295         /*
5296          * Given a INIT packet, look through the packet to verify that there
5297          * are NO new addresses. As we go through the parameters add reports
5298          * of any un-understood parameters that require an error.  Also we
5299          * must return (1) to drop the packet if we see a un-understood
5300          * parameter that tells us to drop the chunk.
5301          */
5302         struct sockaddr *sa_touse;
5303         struct sockaddr *sa;
5304         struct sctp_paramhdr *phdr, params;
5305         uint16_t ptype, plen;
5306         uint8_t fnd;
5307         struct sctp_nets *net;
5308         int check_src;
5309 #ifdef INET
5310         struct sockaddr_in sin4, *sa4;
5311 #endif
5312 #ifdef INET6
5313         struct sockaddr_in6 sin6, *sa6;
5314 #endif
5315
5316 #ifdef INET
5317         memset(&sin4, 0, sizeof(sin4));
5318         sin4.sin_family = AF_INET;
5319         sin4.sin_len = sizeof(sin4);
5320 #endif
5321 #ifdef INET6
5322         memset(&sin6, 0, sizeof(sin6));
5323         sin6.sin6_family = AF_INET6;
5324         sin6.sin6_len = sizeof(sin6);
5325 #endif
5326         /* First what about the src address of the pkt ? */
5327         check_src = 0;
5328         switch (src->sa_family) {
5329 #ifdef INET
5330         case AF_INET:
5331                 if (asoc->scope.ipv4_addr_legal) {
5332                         check_src = 1;
5333                 }
5334                 break;
5335 #endif
5336 #ifdef INET6
5337         case AF_INET6:
5338                 if (asoc->scope.ipv6_addr_legal) {
5339                         check_src = 1;
5340                 }
5341                 break;
5342 #endif
5343         default:
5344                 /* TSNH */
5345                 break;
5346         }
5347         if (check_src) {
5348                 fnd = 0;
5349                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5350                         sa = (struct sockaddr *)&net->ro._l_addr;
5351                         if (sa->sa_family == src->sa_family) {
5352 #ifdef INET
5353                                 if (sa->sa_family == AF_INET) {
5354                                         struct sockaddr_in *src4;
5355
5356                                         sa4 = (struct sockaddr_in *)sa;
5357                                         src4 = (struct sockaddr_in *)src;
5358                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5359                                                 fnd = 1;
5360                                                 break;
5361                                         }
5362                                 }
5363 #endif
5364 #ifdef INET6
5365                                 if (sa->sa_family == AF_INET6) {
5366                                         struct sockaddr_in6 *src6;
5367
5368                                         sa6 = (struct sockaddr_in6 *)sa;
5369                                         src6 = (struct sockaddr_in6 *)src;
5370                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5371                                                 fnd = 1;
5372                                                 break;
5373                                         }
5374                                 }
5375 #endif
5376                         }
5377                 }
5378                 if (fnd == 0) {
5379                         /* New address added! no need to look further. */
5380                         return (1);
5381                 }
5382         }
5383         /* Ok so far lets munge through the rest of the packet */
5384         offset += sizeof(struct sctp_init_chunk);
5385         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5386         while (phdr) {
5387                 sa_touse = NULL;
5388                 ptype = ntohs(phdr->param_type);
5389                 plen = ntohs(phdr->param_length);
5390                 switch (ptype) {
5391 #ifdef INET
5392                 case SCTP_IPV4_ADDRESS:
5393                         {
5394                                 struct sctp_ipv4addr_param *p4, p4_buf;
5395
5396                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
5397                                         return (1);
5398                                 }
5399                                 phdr = sctp_get_next_param(in_initpkt, offset,
5400                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5401                                 if (phdr == NULL) {
5402                                         return (1);
5403                                 }
5404                                 if (asoc->scope.ipv4_addr_legal) {
5405                                         p4 = (struct sctp_ipv4addr_param *)phdr;
5406                                         sin4.sin_addr.s_addr = p4->addr;
5407                                         sa_touse = (struct sockaddr *)&sin4;
5408                                 }
5409                                 break;
5410                         }
5411 #endif
5412 #ifdef INET6
5413                 case SCTP_IPV6_ADDRESS:
5414                         {
5415                                 struct sctp_ipv6addr_param *p6, p6_buf;
5416
5417                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
5418                                         return (1);
5419                                 }
5420                                 phdr = sctp_get_next_param(in_initpkt, offset,
5421                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5422                                 if (phdr == NULL) {
5423                                         return (1);
5424                                 }
5425                                 if (asoc->scope.ipv6_addr_legal) {
5426                                         p6 = (struct sctp_ipv6addr_param *)phdr;
5427                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5428                                             sizeof(p6->addr));
5429                                         sa_touse = (struct sockaddr *)&sin6;
5430                                 }
5431                                 break;
5432                         }
5433 #endif
5434                 default:
5435                         sa_touse = NULL;
5436                         break;
5437                 }
5438                 if (sa_touse) {
5439                         /* ok, sa_touse points to one to check */
5440                         fnd = 0;
5441                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5442                                 sa = (struct sockaddr *)&net->ro._l_addr;
5443                                 if (sa->sa_family != sa_touse->sa_family) {
5444                                         continue;
5445                                 }
5446 #ifdef INET
5447                                 if (sa->sa_family == AF_INET) {
5448                                         sa4 = (struct sockaddr_in *)sa;
5449                                         if (sa4->sin_addr.s_addr ==
5450                                             sin4.sin_addr.s_addr) {
5451                                                 fnd = 1;
5452                                                 break;
5453                                         }
5454                                 }
5455 #endif
5456 #ifdef INET6
5457                                 if (sa->sa_family == AF_INET6) {
5458                                         sa6 = (struct sockaddr_in6 *)sa;
5459                                         if (SCTP6_ARE_ADDR_EQUAL(
5460                                             sa6, &sin6)) {
5461                                                 fnd = 1;
5462                                                 break;
5463                                         }
5464                                 }
5465 #endif
5466                         }
5467                         if (!fnd) {
5468                                 /* New addr added! no need to look further */
5469                                 return (1);
5470                         }
5471                 }
5472                 offset += SCTP_SIZE32(plen);
5473                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5474         }
5475         return (0);
5476 }
5477
5478 /*
5479  * Given a MBUF chain that was sent into us containing an INIT. Build a
5480  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5481  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5482  * message (i.e. the struct sctp_init_msg).
5483  */
5484 void
5485 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5486     struct sctp_nets *src_net, struct mbuf *init_pkt,
5487     int iphlen, int offset,
5488     struct sockaddr *src, struct sockaddr *dst,
5489     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5490     uint8_t mflowtype, uint32_t mflowid,
5491     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5492 {
5493         struct sctp_association *asoc;
5494         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5495         struct sctp_init_ack_chunk *initack;
5496         struct sctp_adaptation_layer_indication *ali;
5497         struct sctp_supported_chunk_types_param *pr_supported;
5498         struct sctp_paramhdr *ph;
5499         union sctp_sockstore *over_addr;
5500         struct sctp_scoping scp;
5501 #ifdef INET
5502         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5503         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5504         struct sockaddr_in *sin;
5505 #endif
5506 #ifdef INET6
5507         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5508         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5509         struct sockaddr_in6 *sin6;
5510 #endif
5511         struct sockaddr *to;
5512         struct sctp_state_cookie stc;
5513         struct sctp_nets *net = NULL;
5514         uint8_t *signature = NULL;
5515         int cnt_inits_to = 0;
5516         uint16_t his_limit, i_want;
5517         int abort_flag;
5518         int nat_friendly = 0;
5519         int error;
5520         struct socket *so;
5521         uint16_t num_ext, chunk_len, padding_len, parameter_len;
5522
5523         if (stcb) {
5524                 asoc = &stcb->asoc;
5525         } else {
5526                 asoc = NULL;
5527         }
5528         if ((asoc != NULL) &&
5529             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5530                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5531                         /*
5532                          * new addresses, out of here in non-cookie-wait
5533                          * states
5534                          *
5535                          * Send an ABORT, without the new address error
5536                          * cause. This looks no different than if no
5537                          * listener was present.
5538                          */
5539                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5540                             "Address added");
5541                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5542                             mflowtype, mflowid, inp->fibnum,
5543                             vrf_id, port);
5544                         return;
5545                 }
5546                 if (src_net != NULL && (src_net->port != port)) {
5547                         /*
5548                          * change of remote encapsulation port, out of here
5549                          * in non-cookie-wait states
5550                          *
5551                          * Send an ABORT, without an specific error cause.
5552                          * This looks no different than if no listener was
5553                          * present.
5554                          */
5555                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556                             "Remote encapsulation port changed");
5557                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558                             mflowtype, mflowid, inp->fibnum,
5559                             vrf_id, port);
5560                         return;
5561                 }
5562         }
5563         abort_flag = 0;
5564         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5565             (offset + sizeof(struct sctp_init_chunk)),
5566             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5567         if (abort_flag) {
5568 do_a_abort:
5569                 if (op_err == NULL) {
5570                         char msg[SCTP_DIAG_INFO_LEN];
5571
5572                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5573                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5574                             msg);
5575                 }
5576                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5577                     init_chk->init.initiate_tag, op_err,
5578                     mflowtype, mflowid, inp->fibnum,
5579                     vrf_id, port);
5580                 return;
5581         }
5582         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5583         if (m == NULL) {
5584                 /* No memory, INIT timer will re-attempt. */
5585                 if (op_err)
5586                         sctp_m_freem(op_err);
5587                 return;
5588         }
5589         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5590         padding_len = 0;
5591
5592         /*
5593          * We might not overwrite the identification[] completely and on
5594          * some platforms time_entered will contain some padding. Therefore
5595          * zero out the cookie to avoid putting uninitialized memory on the
5596          * wire.
5597          */
5598         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5599
5600         /* the time I built cookie */
5601         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5602
5603         /* populate any tie tags */
5604         if (asoc != NULL) {
5605                 /* unlock before tag selections */
5606                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5607                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5608                 stc.cookie_life = asoc->cookie_life;
5609                 net = asoc->primary_destination;
5610         } else {
5611                 stc.tie_tag_my_vtag = 0;
5612                 stc.tie_tag_peer_vtag = 0;
5613                 /* life I will award this cookie */
5614                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5615         }
5616
5617         /* copy in the ports for later check */
5618         stc.myport = sh->dest_port;
5619         stc.peerport = sh->src_port;
5620
5621         /*
5622          * If we wanted to honor cookie life extensions, we would add to
5623          * stc.cookie_life. For now we should NOT honor any extension
5624          */
5625         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5626         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5627                 stc.ipv6_addr_legal = 1;
5628                 if (SCTP_IPV6_V6ONLY(inp)) {
5629                         stc.ipv4_addr_legal = 0;
5630                 } else {
5631                         stc.ipv4_addr_legal = 1;
5632                 }
5633         } else {
5634                 stc.ipv6_addr_legal = 0;
5635                 stc.ipv4_addr_legal = 1;
5636         }
5637         stc.ipv4_scope = 0;
5638         if (net == NULL) {
5639                 to = src;
5640                 switch (dst->sa_family) {
5641 #ifdef INET
5642                 case AF_INET:
5643                         {
5644                                 /* lookup address */
5645                                 stc.address[0] = src4->sin_addr.s_addr;
5646                                 stc.address[1] = 0;
5647                                 stc.address[2] = 0;
5648                                 stc.address[3] = 0;
5649                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5650                                 /* local from address */
5651                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5652                                 stc.laddress[1] = 0;
5653                                 stc.laddress[2] = 0;
5654                                 stc.laddress[3] = 0;
5655                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5656                                 /* scope_id is only for v6 */
5657                                 stc.scope_id = 0;
5658                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5659                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5660                                         stc.ipv4_scope = 1;
5661                                 }
5662                                 /* Must use the address in this case */
5663                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5664                                         stc.loopback_scope = 1;
5665                                         stc.ipv4_scope = 1;
5666                                         stc.site_scope = 1;
5667                                         stc.local_scope = 0;
5668                                 }
5669                                 break;
5670                         }
5671 #endif
5672 #ifdef INET6
5673                 case AF_INET6:
5674                         {
5675                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5676                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5677                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5678                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5679                                         stc.loopback_scope = 1;
5680                                         stc.local_scope = 0;
5681                                         stc.site_scope = 1;
5682                                         stc.ipv4_scope = 1;
5683                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5684                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5685                                         /*
5686                                          * If the new destination or source
5687                                          * is a LINK_LOCAL we must have
5688                                          * common both site and local scope.
5689                                          * Don't set local scope though
5690                                          * since we must depend on the
5691                                          * source to be added implicitly. We
5692                                          * cannot assure just because we
5693                                          * share one link that all links are
5694                                          * common.
5695                                          */
5696                                         stc.local_scope = 0;
5697                                         stc.site_scope = 1;
5698                                         stc.ipv4_scope = 1;
5699                                         /*
5700                                          * we start counting for the private
5701                                          * address stuff at 1. since the
5702                                          * link local we source from won't
5703                                          * show up in our scoped count.
5704                                          */
5705                                         cnt_inits_to = 1;
5706                                         /*
5707                                          * pull out the scope_id from
5708                                          * incoming pkt
5709                                          */
5710                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5711                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5712                                         /*
5713                                          * If the new destination or source
5714                                          * is SITE_LOCAL then we must have
5715                                          * site scope in common.
5716                                          */
5717                                         stc.site_scope = 1;
5718                                 }
5719                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5720                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5721                                 break;
5722                         }
5723 #endif
5724                 default:
5725                         /* TSNH */
5726                         goto do_a_abort;
5727                         break;
5728                 }
5729         } else {
5730                 /* set the scope per the existing tcb */
5731
5732 #ifdef INET6
5733                 struct sctp_nets *lnet;
5734 #endif
5735
5736                 stc.loopback_scope = asoc->scope.loopback_scope;
5737                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5738                 stc.site_scope = asoc->scope.site_scope;
5739                 stc.local_scope = asoc->scope.local_scope;
5740 #ifdef INET6
5741                 /* Why do we not consider IPv4 LL addresses? */
5742                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5743                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5744                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5745                                         /*
5746                                          * if we have a LL address, start
5747                                          * counting at 1.
5748                                          */
5749                                         cnt_inits_to = 1;
5750                                 }
5751                         }
5752                 }
5753 #endif
5754                 /* use the net pointer */
5755                 to = (struct sockaddr *)&net->ro._l_addr;
5756                 switch (to->sa_family) {
5757 #ifdef INET
5758                 case AF_INET:
5759                         sin = (struct sockaddr_in *)to;
5760                         stc.address[0] = sin->sin_addr.s_addr;
5761                         stc.address[1] = 0;
5762                         stc.address[2] = 0;
5763                         stc.address[3] = 0;
5764                         stc.addr_type = SCTP_IPV4_ADDRESS;
5765                         if (net->src_addr_selected == 0) {
5766                                 /*
5767                                  * strange case here, the INIT should have
5768                                  * did the selection.
5769                                  */
5770                                 net->ro._s_addr = sctp_source_address_selection(inp,
5771                                     stcb, (sctp_route_t *)&net->ro,
5772                                     net, 0, vrf_id);
5773                                 if (net->ro._s_addr == NULL)
5774                                         return;
5775
5776                                 net->src_addr_selected = 1;
5777
5778                         }
5779                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5780                         stc.laddress[1] = 0;
5781                         stc.laddress[2] = 0;
5782                         stc.laddress[3] = 0;
5783                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5784                         /* scope_id is only for v6 */
5785                         stc.scope_id = 0;
5786                         break;
5787 #endif
5788 #ifdef INET6
5789                 case AF_INET6:
5790                         sin6 = (struct sockaddr_in6 *)to;
5791                         memcpy(&stc.address, &sin6->sin6_addr,
5792                             sizeof(struct in6_addr));
5793                         stc.addr_type = SCTP_IPV6_ADDRESS;
5794                         stc.scope_id = sin6->sin6_scope_id;
5795                         if (net->src_addr_selected == 0) {
5796                                 /*
5797                                  * strange case here, the INIT should have
5798                                  * done the selection.
5799                                  */
5800                                 net->ro._s_addr = sctp_source_address_selection(inp,
5801                                     stcb, (sctp_route_t *)&net->ro,
5802                                     net, 0, vrf_id);
5803                                 if (net->ro._s_addr == NULL)
5804                                         return;
5805
5806                                 net->src_addr_selected = 1;
5807                         }
5808                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5809                             sizeof(struct in6_addr));
5810                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5811                         break;
5812 #endif
5813                 }
5814         }
5815         /* Now lets put the SCTP header in place */
5816         initack = mtod(m, struct sctp_init_ack_chunk *);
5817         /* Save it off for quick ref */
5818         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5819         /* who are we */
5820         memcpy(stc.identification, SCTP_VERSION_STRING,
5821             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5822         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5823         /* now the chunk header */
5824         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5825         initack->ch.chunk_flags = 0;
5826         /* fill in later from mbuf we build */
5827         initack->ch.chunk_length = 0;
5828         /* place in my tag */
5829         if ((asoc != NULL) &&
5830             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5831             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5832             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5833                 /* re-use the v-tags and init-seq here */
5834                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5835                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5836         } else {
5837                 uint32_t vtag, itsn;
5838
5839                 if (hold_inp_lock) {
5840                         SCTP_INP_INCR_REF(inp);
5841                         SCTP_INP_RUNLOCK(inp);
5842                 }
5843                 if (asoc) {
5844                         atomic_add_int(&asoc->refcnt, 1);
5845                         SCTP_TCB_UNLOCK(stcb);
5846         new_tag:
5847                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5848                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5849                                 /*
5850                                  * Got a duplicate vtag on some guy behind a
5851                                  * nat make sure we don't use it.
5852                                  */
5853                                 goto new_tag;
5854                         }
5855                         initack->init.initiate_tag = htonl(vtag);
5856                         /* get a TSN to use too */
5857                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5858                         initack->init.initial_tsn = htonl(itsn);
5859                         SCTP_TCB_LOCK(stcb);
5860                         atomic_add_int(&asoc->refcnt, -1);
5861                 } else {
5862                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5863                         initack->init.initiate_tag = htonl(vtag);
5864                         /* get a TSN to use too */
5865                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5866                 }
5867                 if (hold_inp_lock) {
5868                         SCTP_INP_RLOCK(inp);
5869                         SCTP_INP_DECR_REF(inp);
5870                 }
5871         }
5872         /* save away my tag to */
5873         stc.my_vtag = initack->init.initiate_tag;
5874
5875         /* set up some of the credits. */
5876         so = inp->sctp_socket;
5877         if (so == NULL) {
5878                 /* memory problem */
5879                 sctp_m_freem(m);
5880                 return;
5881         } else {
5882                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5883         }
5884         /* set what I want */
5885         his_limit = ntohs(init_chk->init.num_inbound_streams);
5886         /* choose what I want */
5887         if (asoc != NULL) {
5888                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
5889                         i_want = asoc->streamoutcnt;
5890                 } else {
5891                         i_want = asoc->pre_open_streams;
5892                 }
5893         } else {
5894                 i_want = inp->sctp_ep.pre_open_stream_count;
5895         }
5896         if (his_limit < i_want) {
5897                 /* I Want more :< */
5898                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5899         } else {
5900                 /* I can have what I want :> */
5901                 initack->init.num_outbound_streams = htons(i_want);
5902         }
5903         /* tell him his limit. */
5904         initack->init.num_inbound_streams =
5905             htons(inp->sctp_ep.max_open_streams_intome);
5906
5907         /* adaptation layer indication parameter */
5908         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5909                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5910                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5911                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5912                 ali->ph.param_length = htons(parameter_len);
5913                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5914                 chunk_len += parameter_len;
5915         }
5916         /* ECN parameter */
5917         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5918             ((asoc == NULL) && (inp->ecn_supported == 1))) {
5919                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5920                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5921                 ph->param_type = htons(SCTP_ECN_CAPABLE);
5922                 ph->param_length = htons(parameter_len);
5923                 chunk_len += parameter_len;
5924         }
5925         /* PR-SCTP supported parameter */
5926         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5927             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5928                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5929                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5930                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5931                 ph->param_length = htons(parameter_len);
5932                 chunk_len += parameter_len;
5933         }
5934         /* Add NAT friendly parameter */
5935         if (nat_friendly) {
5936                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5937                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5938                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5939                 ph->param_length = htons(parameter_len);
5940                 chunk_len += parameter_len;
5941         }
5942         /* And now tell the peer which extensions we support */
5943         num_ext = 0;
5944         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5945         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5946             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5947                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5948                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5949                     ((asoc == NULL) && (inp->idata_supported == 1))) {
5950                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5951                 }
5952         }
5953         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5954             ((asoc == NULL) && (inp->auth_supported == 1))) {
5955                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5956         }
5957         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5958             ((asoc == NULL) && (inp->asconf_supported == 1))) {
5959                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5960                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5961         }
5962         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5963             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5964                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5965         }
5966         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5967             ((asoc == NULL) && (inp->idata_supported == 1))) {
5968                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5969         }
5970         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5971             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5972                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5973         }
5974         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5975             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5976                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5977         }
5978         if (num_ext > 0) {
5979                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5980                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5981                 pr_supported->ph.param_length = htons(parameter_len);
5982                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5983                 chunk_len += parameter_len;
5984         }
5985         /* add authentication parameters */
5986         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5987             ((asoc == NULL) && (inp->auth_supported == 1))) {
5988                 struct sctp_auth_random *randp;
5989                 struct sctp_auth_hmac_algo *hmacs;
5990                 struct sctp_auth_chunk_list *chunks;
5991
5992                 if (padding_len > 0) {
5993                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5994                         chunk_len += padding_len;
5995                         padding_len = 0;
5996                 }
5997                 /* generate and add RANDOM parameter */
5998                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5999                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6000                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6001                 randp->ph.param_type = htons(SCTP_RANDOM);
6002                 randp->ph.param_length = htons(parameter_len);
6003                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6004                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6005                 chunk_len += parameter_len;
6006
6007                 if (padding_len > 0) {
6008                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6009                         chunk_len += padding_len;
6010                         padding_len = 0;
6011                 }
6012                 /* add HMAC_ALGO parameter */
6013                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6014                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6015                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6016                     (uint8_t *)hmacs->hmac_ids);
6017                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6018                 hmacs->ph.param_length = htons(parameter_len);
6019                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6020                 chunk_len += parameter_len;
6021
6022                 if (padding_len > 0) {
6023                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6024                         chunk_len += padding_len;
6025                         padding_len = 0;
6026                 }
6027                 /* add CHUNKS parameter */
6028                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6029                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6030                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6031                     chunks->chunk_types);
6032                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6033                 chunks->ph.param_length = htons(parameter_len);
6034                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6035                 chunk_len += parameter_len;
6036         }
6037         SCTP_BUF_LEN(m) = chunk_len;
6038         m_last = m;
6039         /* now the addresses */
6040         /*
6041          * To optimize this we could put the scoping stuff into a structure
6042          * and remove the individual uint8's from the stc structure. Then we
6043          * could just sifa in the address within the stc.. but for now this
6044          * is a quick hack to get the address stuff teased apart.
6045          */
6046         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6047         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6048         scp.loopback_scope = stc.loopback_scope;
6049         scp.ipv4_local_scope = stc.ipv4_scope;
6050         scp.local_scope = stc.local_scope;
6051         scp.site_scope = stc.site_scope;
6052         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6053             cnt_inits_to,
6054             &padding_len, &chunk_len);
6055         /* padding_len can only be positive, if no addresses have been added */
6056         if (padding_len > 0) {
6057                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6058                 chunk_len += padding_len;
6059                 SCTP_BUF_LEN(m) += padding_len;
6060                 padding_len = 0;
6061         }
6062         /* tack on the operational error if present */
6063         if (op_err) {
6064                 parameter_len = 0;
6065                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6066                         parameter_len += SCTP_BUF_LEN(m_tmp);
6067                 }
6068                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6069                 SCTP_BUF_NEXT(m_last) = op_err;
6070                 while (SCTP_BUF_NEXT(m_last) != NULL) {
6071                         m_last = SCTP_BUF_NEXT(m_last);
6072                 }
6073                 chunk_len += parameter_len;
6074         }
6075         if (padding_len > 0) {
6076                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
6077                 if (m_last == NULL) {
6078                         /* Houston we have a problem, no space */
6079                         sctp_m_freem(m);
6080                         return;
6081                 }
6082                 chunk_len += padding_len;
6083                 padding_len = 0;
6084         }
6085         /* Now we must build a cookie */
6086         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6087         if (m_cookie == NULL) {
6088                 /* memory problem */
6089                 sctp_m_freem(m);
6090                 return;
6091         }
6092         /* Now append the cookie to the end and update the space/size */
6093         SCTP_BUF_NEXT(m_last) = m_cookie;
6094         parameter_len = 0;
6095         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6096                 parameter_len += SCTP_BUF_LEN(m_tmp);
6097                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6098                         m_last = m_tmp;
6099                 }
6100         }
6101         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6102         chunk_len += parameter_len;
6103
6104         /*
6105          * Place in the size, but we don't include the last pad (if any) in
6106          * the INIT-ACK.
6107          */
6108         initack->ch.chunk_length = htons(chunk_len);
6109
6110         /*
6111          * Time to sign the cookie, we don't sign over the cookie signature
6112          * though thus we set trailer.
6113          */
6114         (void)sctp_hmac_m(SCTP_HMAC,
6115             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6116             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6117             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6118         /*
6119          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6120          * here since the timer will drive a retranmission.
6121          */
6122         if (padding_len > 0) {
6123                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6124                         sctp_m_freem(m);
6125                         return;
6126                 }
6127         }
6128         if (stc.loopback_scope) {
6129                 over_addr = (union sctp_sockstore *)dst;
6130         } else {
6131                 over_addr = NULL;
6132         }
6133
6134         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6135             0, 0,
6136             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6137             port, over_addr,
6138             mflowtype, mflowid,
6139             SCTP_SO_NOT_LOCKED))) {
6140                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6141                 if (error == ENOBUFS) {
6142                         if (asoc != NULL) {
6143                                 asoc->ifp_had_enobuf = 1;
6144                         }
6145                         SCTP_STAT_INCR(sctps_lowlevelerr);
6146                 }
6147         } else {
6148                 if (asoc != NULL) {
6149                         asoc->ifp_had_enobuf = 0;
6150                 }
6151         }
6152         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6153 }
6154
6155
6156 static void
6157 sctp_prune_prsctp(struct sctp_tcb *stcb,
6158     struct sctp_association *asoc,
6159     struct sctp_sndrcvinfo *srcv,
6160     int dataout)
6161 {
6162         int freed_spc = 0;
6163         struct sctp_tmit_chunk *chk, *nchk;
6164
6165         SCTP_TCB_LOCK_ASSERT(stcb);
6166         if ((asoc->prsctp_supported) &&
6167             (asoc->sent_queue_cnt_removeable > 0)) {
6168                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6169                         /*
6170                          * Look for chunks marked with the PR_SCTP flag AND
6171                          * the buffer space flag. If the one being sent is
6172                          * equal or greater priority then purge the old one
6173                          * and free some space.
6174                          */
6175                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6176                                 /*
6177                                  * This one is PR-SCTP AND buffer space
6178                                  * limited type
6179                                  */
6180                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6181                                         /*
6182                                          * Lower numbers equates to higher
6183                                          * priority so if the one we are
6184                                          * looking at has a larger or equal
6185                                          * priority we want to drop the data
6186                                          * and NOT retransmit it.
6187                                          */
6188                                         if (chk->data) {
6189                                                 /*
6190                                                  * We release the book_size
6191                                                  * if the mbuf is here
6192                                                  */
6193                                                 int ret_spc;
6194                                                 uint8_t sent;
6195
6196                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6197                                                         sent = 1;
6198                                                 else
6199                                                         sent = 0;
6200                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6201                                                     sent,
6202                                                     SCTP_SO_LOCKED);
6203                                                 freed_spc += ret_spc;
6204                                                 if (freed_spc >= dataout) {
6205                                                         return;
6206                                                 }
6207                                         }       /* if chunk was present */
6208                                 }       /* if of sufficient priority */
6209                         }       /* if chunk has enabled */
6210                 }               /* tailqforeach */
6211
6212                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6213                         /* Here we must move to the sent queue and mark */
6214                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6215                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6216                                         if (chk->data) {
6217                                                 /*
6218                                                  * We release the book_size
6219                                                  * if the mbuf is here
6220                                                  */
6221                                                 int ret_spc;
6222
6223                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6224                                                     0, SCTP_SO_LOCKED);
6225
6226                                                 freed_spc += ret_spc;
6227                                                 if (freed_spc >= dataout) {
6228                                                         return;
6229                                                 }
6230                                         }       /* end if chk->data */
6231                                 }       /* end if right class */
6232                         }       /* end if chk pr-sctp */
6233                 }               /* tailqforeachsafe (chk) */
6234         }                       /* if enabled in asoc */
6235 }
6236
6237 int
6238 sctp_get_frag_point(struct sctp_tcb *stcb,
6239     struct sctp_association *asoc)
6240 {
6241         int siz, ovh;
6242
6243         /*
6244          * For endpoints that have both v6 and v4 addresses we must reserve
6245          * room for the ipv6 header, for those that are only dealing with V4
6246          * we use a larger frag point.
6247          */
6248         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6249                 ovh = SCTP_MIN_OVERHEAD;
6250         } else {
6251                 ovh = SCTP_MIN_V4_OVERHEAD;
6252         }
6253         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6254         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6255                 siz = asoc->smallest_mtu - ovh;
6256         else
6257                 siz = (stcb->asoc.sctp_frag_point - ovh);
6258         /*
6259          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6260          */
6261         /* A data chunk MUST fit in a cluster */
6262         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6263         /* } */
6264
6265         /* adjust for an AUTH chunk if DATA requires auth */
6266         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6267                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6268
6269         if (siz % 4) {
6270                 /* make it an even word boundary please */
6271                 siz -= (siz % 4);
6272         }
6273         return (siz);
6274 }
6275
6276 static void
6277 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6278 {
6279         /*
6280          * We assume that the user wants PR_SCTP_TTL if the user provides a
6281          * positive lifetime but does not specify any PR_SCTP policy.
6282          */
6283         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6284                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6285         } else if (sp->timetolive > 0) {
6286                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6287                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6288         } else {
6289                 return;
6290         }
6291         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6292         case CHUNK_FLAGS_PR_SCTP_BUF:
6293                 /*
6294                  * Time to live is a priority stored in tv_sec when doing
6295                  * the buffer drop thing.
6296                  */
6297                 sp->ts.tv_sec = sp->timetolive;
6298                 sp->ts.tv_usec = 0;
6299                 break;
6300         case CHUNK_FLAGS_PR_SCTP_TTL:
6301                 {
6302                         struct timeval tv;
6303
6304                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6305                         tv.tv_sec = sp->timetolive / 1000;
6306                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6307                         /*
6308                          * TODO sctp_constants.h needs alternative time
6309                          * macros when _KERNEL is undefined.
6310                          */
6311                         timevaladd(&sp->ts, &tv);
6312                 }
6313                 break;
6314         case CHUNK_FLAGS_PR_SCTP_RTX:
6315                 /*
6316                  * Time to live is a the number or retransmissions stored in
6317                  * tv_sec.
6318                  */
6319                 sp->ts.tv_sec = sp->timetolive;
6320                 sp->ts.tv_usec = 0;
6321                 break;
6322         default:
6323                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6324                     "Unknown PR_SCTP policy %u.\n",
6325                     PR_SCTP_POLICY(sp->sinfo_flags));
6326                 break;
6327         }
6328 }
6329
6330 static int
6331 sctp_msg_append(struct sctp_tcb *stcb,
6332     struct sctp_nets *net,
6333     struct mbuf *m,
6334     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6335 {
6336         int error = 0;
6337         struct mbuf *at;
6338         struct sctp_stream_queue_pending *sp = NULL;
6339         struct sctp_stream_out *strm;
6340
6341         /*
6342          * Given an mbuf chain, put it into the association send queue and
6343          * place it on the wheel
6344          */
6345         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6346                 /* Invalid stream number */
6347                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6348                 error = EINVAL;
6349                 goto out_now;
6350         }
6351         if ((stcb->asoc.stream_locked) &&
6352             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6353                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6354                 error = EINVAL;
6355                 goto out_now;
6356         }
6357         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6358         /* Now can we send this? */
6359         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6360             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6361             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6362             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6363                 /* got data while shutting down */
6364                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6365                 error = ECONNRESET;
6366                 goto out_now;
6367         }
6368         sctp_alloc_a_strmoq(stcb, sp);
6369         if (sp == NULL) {
6370                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6371                 error = ENOMEM;
6372                 goto out_now;
6373         }
6374         sp->sinfo_flags = srcv->sinfo_flags;
6375         sp->timetolive = srcv->sinfo_timetolive;
6376         sp->ppid = srcv->sinfo_ppid;
6377         sp->context = srcv->sinfo_context;
6378         sp->fsn = 0;
6379         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6380                 sp->net = net;
6381                 atomic_add_int(&sp->net->ref_count, 1);
6382         } else {
6383                 sp->net = NULL;
6384         }
6385         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6386         sp->sid = srcv->sinfo_stream;
6387         sp->msg_is_complete = 1;
6388         sp->sender_all_done = 1;
6389         sp->some_taken = 0;
6390         sp->data = m;
6391         sp->tail_mbuf = NULL;
6392         sctp_set_prsctp_policy(sp);
6393         /*
6394          * We could in theory (for sendall) sifa the length in, but we would
6395          * still have to hunt through the chain since we need to setup the
6396          * tail_mbuf
6397          */
6398         sp->length = 0;
6399         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6400                 if (SCTP_BUF_NEXT(at) == NULL)
6401                         sp->tail_mbuf = at;
6402                 sp->length += SCTP_BUF_LEN(at);
6403         }
6404         if (srcv->sinfo_keynumber_valid) {
6405                 sp->auth_keyid = srcv->sinfo_keynumber;
6406         } else {
6407                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6408         }
6409         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6410                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6411                 sp->holds_key_ref = 1;
6412         }
6413         if (hold_stcb_lock == 0) {
6414                 SCTP_TCB_SEND_LOCK(stcb);
6415         }
6416         sctp_snd_sb_alloc(stcb, sp->length);
6417         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6418         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6419         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6420         m = NULL;
6421         if (hold_stcb_lock == 0) {
6422                 SCTP_TCB_SEND_UNLOCK(stcb);
6423         }
6424 out_now:
6425         if (m) {
6426                 sctp_m_freem(m);
6427         }
6428         return (error);
6429 }
6430
6431
6432 static struct mbuf *
6433 sctp_copy_mbufchain(struct mbuf *clonechain,
6434     struct mbuf *outchain,
6435     struct mbuf **endofchain,
6436     int can_take_mbuf,
6437     int sizeofcpy,
6438     uint8_t copy_by_ref)
6439 {
6440         struct mbuf *m;
6441         struct mbuf *appendchain;
6442         caddr_t cp;
6443         int len;
6444
6445         if (endofchain == NULL) {
6446                 /* error */
6447 error_out:
6448                 if (outchain)
6449                         sctp_m_freem(outchain);
6450                 return (NULL);
6451         }
6452         if (can_take_mbuf) {
6453                 appendchain = clonechain;
6454         } else {
6455                 if (!copy_by_ref &&
6456                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6457                     ) {
6458                         /* Its not in a cluster */
6459                         if (*endofchain == NULL) {
6460                                 /* lets get a mbuf cluster */
6461                                 if (outchain == NULL) {
6462                                         /* This is the general case */
6463                         new_mbuf:
6464                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6465                                         if (outchain == NULL) {
6466                                                 goto error_out;
6467                                         }
6468                                         SCTP_BUF_LEN(outchain) = 0;
6469                                         *endofchain = outchain;
6470                                         /* get the prepend space */
6471                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6472                                 } else {
6473                                         /*
6474                                          * We really should not get a NULL
6475                                          * in endofchain
6476                                          */
6477                                         /* find end */
6478                                         m = outchain;
6479                                         while (m) {
6480                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6481                                                         *endofchain = m;
6482                                                         break;
6483                                                 }
6484                                                 m = SCTP_BUF_NEXT(m);
6485                                         }
6486                                         /* sanity */
6487                                         if (*endofchain == NULL) {
6488                                                 /*
6489                                                  * huh, TSNH XXX maybe we
6490                                                  * should panic
6491                                                  */
6492                                                 sctp_m_freem(outchain);
6493                                                 goto new_mbuf;
6494                                         }
6495                                 }
6496                                 /* get the new end of length */
6497                                 len = (int)M_TRAILINGSPACE(*endofchain);
6498                         } else {
6499                                 /* how much is left at the end? */
6500                                 len = (int)M_TRAILINGSPACE(*endofchain);
6501                         }
6502                         /* Find the end of the data, for appending */
6503                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6504
6505                         /* Now lets copy it out */
6506                         if (len >= sizeofcpy) {
6507                                 /* It all fits, copy it in */
6508                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6509                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6510                         } else {
6511                                 /* fill up the end of the chain */
6512                                 if (len > 0) {
6513                                         m_copydata(clonechain, 0, len, cp);
6514                                         SCTP_BUF_LEN((*endofchain)) += len;
6515                                         /* now we need another one */
6516                                         sizeofcpy -= len;
6517                                 }
6518                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6519                                 if (m == NULL) {
6520                                         /* We failed */
6521                                         goto error_out;
6522                                 }
6523                                 SCTP_BUF_NEXT((*endofchain)) = m;
6524                                 *endofchain = m;
6525                                 cp = mtod((*endofchain), caddr_t);
6526                                 m_copydata(clonechain, len, sizeofcpy, cp);
6527                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6528                         }
6529                         return (outchain);
6530                 } else {
6531                         /* copy the old fashion way */
6532                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6533 #ifdef SCTP_MBUF_LOGGING
6534                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6535                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6536                         }
6537 #endif
6538                 }
6539         }
6540         if (appendchain == NULL) {
6541                 /* error */
6542                 if (outchain)
6543                         sctp_m_freem(outchain);
6544                 return (NULL);
6545         }
6546         if (outchain) {
6547                 /* tack on to the end */
6548                 if (*endofchain != NULL) {
6549                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6550                 } else {
6551                         m = outchain;
6552                         while (m) {
6553                                 if (SCTP_BUF_NEXT(m) == NULL) {
6554                                         SCTP_BUF_NEXT(m) = appendchain;
6555                                         break;
6556                                 }
6557                                 m = SCTP_BUF_NEXT(m);
6558                         }
6559                 }
6560                 /*
6561                  * save off the end and update the end-chain position
6562                  */
6563                 m = appendchain;
6564                 while (m) {
6565                         if (SCTP_BUF_NEXT(m) == NULL) {
6566                                 *endofchain = m;
6567                                 break;
6568                         }
6569                         m = SCTP_BUF_NEXT(m);
6570                 }
6571                 return (outchain);
6572         } else {
6573                 /* save off the end and update the end-chain position */
6574                 m = appendchain;
6575                 while (m) {
6576                         if (SCTP_BUF_NEXT(m) == NULL) {
6577                                 *endofchain = m;
6578                                 break;
6579                         }
6580                         m = SCTP_BUF_NEXT(m);
6581                 }
6582                 return (appendchain);
6583         }
6584 }
6585
6586 static int
6587 sctp_med_chunk_output(struct sctp_inpcb *inp,
6588     struct sctp_tcb *stcb,
6589     struct sctp_association *asoc,
6590     int *num_out,
6591     int *reason_code,
6592     int control_only, int from_where,
6593     struct timeval *now, int *now_filled, int frag_point, int so_locked
6594 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6595     SCTP_UNUSED
6596 #endif
6597 );
6598
6599 static void
6600 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6601     uint32_t val SCTP_UNUSED)
6602 {
6603         struct sctp_copy_all *ca;
6604         struct mbuf *m;
6605         int ret = 0;
6606         int added_control = 0;
6607         int un_sent, do_chunk_output = 1;
6608         struct sctp_association *asoc;
6609         struct sctp_nets *net;
6610
6611         ca = (struct sctp_copy_all *)ptr;
6612         if (ca->m == NULL) {
6613                 return;
6614         }
6615         if (ca->inp != inp) {
6616                 /* TSNH */
6617                 return;
6618         }
6619         if (ca->sndlen > 0) {
6620                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6621                 if (m == NULL) {
6622                         /* can't copy so we are done */
6623                         ca->cnt_failed++;
6624                         return;
6625                 }
6626 #ifdef SCTP_MBUF_LOGGING
6627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6628                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6629                 }
6630 #endif
6631         } else {
6632                 m = NULL;
6633         }
6634         SCTP_TCB_LOCK_ASSERT(stcb);
6635         if (stcb->asoc.alternate) {
6636                 net = stcb->asoc.alternate;
6637         } else {
6638                 net = stcb->asoc.primary_destination;
6639         }
6640         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6641                 /* Abort this assoc with m as the user defined reason */
6642                 if (m != NULL) {
6643                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6644                 } else {
6645                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6646                             0, M_NOWAIT, 1, MT_DATA);
6647                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6648                 }
6649                 if (m != NULL) {
6650                         struct sctp_paramhdr *ph;
6651
6652                         ph = mtod(m, struct sctp_paramhdr *);
6653                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6654                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6655                 }
6656                 /*
6657                  * We add one here to keep the assoc from dis-appearing on
6658                  * us.
6659                  */
6660                 atomic_add_int(&stcb->asoc.refcnt, 1);
6661                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6662                 /*
6663                  * sctp_abort_an_association calls sctp_free_asoc() free
6664                  * association will NOT free it since we incremented the
6665                  * refcnt .. we do this to prevent it being freed and things
6666                  * getting tricky since we could end up (from free_asoc)
6667                  * calling inpcb_free which would get a recursive lock call
6668                  * to the iterator lock.. But as a consequence of that the
6669                  * stcb will return to us un-locked.. since free_asoc
6670                  * returns with either no TCB or the TCB unlocked, we must
6671                  * relock.. to unlock in the iterator timer :-0
6672                  */
6673                 SCTP_TCB_LOCK(stcb);
6674                 atomic_add_int(&stcb->asoc.refcnt, -1);
6675                 goto no_chunk_output;
6676         } else {
6677                 if (m) {
6678                         ret = sctp_msg_append(stcb, net, m,
6679                             &ca->sndrcv, 1);
6680                 }
6681                 asoc = &stcb->asoc;
6682                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6683                         /* shutdown this assoc */
6684                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6685                             TAILQ_EMPTY(&asoc->sent_queue) &&
6686                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6687                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6688                                         goto abort_anyway;
6689                                 }
6690                                 /*
6691                                  * there is nothing queued to send, so I'm
6692                                  * done...
6693                                  */
6694                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6695                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6696                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6697                                         /*
6698                                          * only send SHUTDOWN the first time
6699                                          * through
6700                                          */
6701                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6702                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6703                                         }
6704                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6705                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6706                                         sctp_stop_timers_for_shutdown(stcb);
6707                                         sctp_send_shutdown(stcb, net);
6708                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6709                                             net);
6710                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6711                                             asoc->primary_destination);
6712                                         added_control = 1;
6713                                         do_chunk_output = 0;
6714                                 }
6715                         } else {
6716                                 /*
6717                                  * we still got (or just got) data to send,
6718                                  * so set SHUTDOWN_PENDING
6719                                  */
6720                                 /*
6721                                  * XXX sockets draft says that SCTP_EOF
6722                                  * should be sent with no data.  currently,
6723                                  * we will allow user data to be sent first
6724                                  * and move to SHUTDOWN-PENDING
6725                                  */
6726                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6727                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6728                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6729                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6730                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6731                                         }
6732                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6733                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6734                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6735                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6736                                                 struct mbuf *op_err;
6737                                                 char msg[SCTP_DIAG_INFO_LEN];
6738
6739                                 abort_anyway:
6740                                                 snprintf(msg, sizeof(msg),
6741                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
6742                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6743                                                     msg);
6744                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6745                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6746                                                     op_err, SCTP_SO_NOT_LOCKED);
6747                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6748                                                 goto no_chunk_output;
6749                                         }
6750                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6751                                             asoc->primary_destination);
6752                                 }
6753                         }
6754
6755                 }
6756         }
6757         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6758             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6759
6760         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6761             (stcb->asoc.total_flight > 0) &&
6762             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6763                 do_chunk_output = 0;
6764         }
6765         if (do_chunk_output)
6766                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6767         else if (added_control) {
6768                 int num_out, reason, now_filled = 0;
6769                 struct timeval now;
6770                 int frag_point;
6771
6772                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6773                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6774                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6775         }
6776 no_chunk_output:
6777         if (ret) {
6778                 ca->cnt_failed++;
6779         } else {
6780                 ca->cnt_sent++;
6781         }
6782 }
6783
6784 static void
6785 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6786 {
6787         struct sctp_copy_all *ca;
6788
6789         ca = (struct sctp_copy_all *)ptr;
6790         /*
6791          * Do a notify here? Kacheong suggests that the notify be done at
6792          * the send time.. so you would push up a notification if any send
6793          * failed. Don't know if this is feasible since the only failures we
6794          * have is "memory" related and if you cannot get an mbuf to send
6795          * the data you surely can't get an mbuf to send up to notify the
6796          * user you can't send the data :->
6797          */
6798
6799         /* now free everything */
6800         sctp_m_freem(ca->m);
6801         SCTP_FREE(ca, SCTP_M_COPYAL);
6802 }
6803
6804 static struct mbuf *
6805 sctp_copy_out_all(struct uio *uio, int len)
6806 {
6807         struct mbuf *ret, *at;
6808         int left, willcpy, cancpy, error;
6809
6810         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6811         if (ret == NULL) {
6812                 /* TSNH */
6813                 return (NULL);
6814         }
6815         left = len;
6816         SCTP_BUF_LEN(ret) = 0;
6817         /* save space for the data chunk header */
6818         cancpy = (int)M_TRAILINGSPACE(ret);
6819         willcpy = min(cancpy, left);
6820         at = ret;
6821         while (left > 0) {
6822                 /* Align data to the end */
6823                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6824                 if (error) {
6825         err_out_now:
6826                         sctp_m_freem(at);
6827                         return (NULL);
6828                 }
6829                 SCTP_BUF_LEN(at) = willcpy;
6830                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6831                 left -= willcpy;
6832                 if (left > 0) {
6833                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6834                         if (SCTP_BUF_NEXT(at) == NULL) {
6835                                 goto err_out_now;
6836                         }
6837                         at = SCTP_BUF_NEXT(at);
6838                         SCTP_BUF_LEN(at) = 0;
6839                         cancpy = (int)M_TRAILINGSPACE(at);
6840                         willcpy = min(cancpy, left);
6841                 }
6842         }
6843         return (ret);
6844 }
6845
6846 static int
6847 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6848     struct sctp_sndrcvinfo *srcv)
6849 {
6850         int ret;
6851         struct sctp_copy_all *ca;
6852
6853         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6854             SCTP_M_COPYAL);
6855         if (ca == NULL) {
6856                 sctp_m_freem(m);
6857                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6858                 return (ENOMEM);
6859         }
6860         memset(ca, 0, sizeof(struct sctp_copy_all));
6861
6862         ca->inp = inp;
6863         if (srcv) {
6864                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6865         }
6866         /*
6867          * take off the sendall flag, it would be bad if we failed to do
6868          * this :-0
6869          */
6870         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6871         /* get length and mbuf chain */
6872         if (uio) {
6873                 ca->sndlen = (int)uio->uio_resid;
6874                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6875                 if (ca->m == NULL) {
6876                         SCTP_FREE(ca, SCTP_M_COPYAL);
6877                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6878                         return (ENOMEM);
6879                 }
6880         } else {
6881                 /* Gather the length of the send */
6882                 struct mbuf *mat;
6883
6884                 ca->sndlen = 0;
6885                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6886                         ca->sndlen += SCTP_BUF_LEN(mat);
6887                 }
6888         }
6889         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6890             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6891             SCTP_ASOC_ANY_STATE,
6892             (void *)ca, 0,
6893             sctp_sendall_completes, inp, 1);
6894         if (ret) {
6895                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6896                 SCTP_FREE(ca, SCTP_M_COPYAL);
6897                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6898                 return (EFAULT);
6899         }
6900         return (0);
6901 }
6902
6903
6904 void
6905 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6906 {
6907         struct sctp_tmit_chunk *chk, *nchk;
6908
6909         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6910                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6911                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6912                         if (chk->data) {
6913                                 sctp_m_freem(chk->data);
6914                                 chk->data = NULL;
6915                         }
6916                         asoc->ctrl_queue_cnt--;
6917                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6918                 }
6919         }
6920 }
6921
6922 void
6923 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6924 {
6925         struct sctp_association *asoc;
6926         struct sctp_tmit_chunk *chk, *nchk;
6927         struct sctp_asconf_chunk *acp;
6928
6929         asoc = &stcb->asoc;
6930         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6931                 /* find SCTP_ASCONF chunk in queue */
6932                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6933                         if (chk->data) {
6934                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6935                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6936                                         /* Not Acked yet */
6937                                         break;
6938                                 }
6939                         }
6940                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6941                         if (chk->data) {
6942                                 sctp_m_freem(chk->data);
6943                                 chk->data = NULL;
6944                         }
6945                         asoc->ctrl_queue_cnt--;
6946                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6947                 }
6948         }
6949 }
6950
6951
6952 static void
6953 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6954     struct sctp_association *asoc,
6955     struct sctp_tmit_chunk **data_list,
6956     int bundle_at,
6957     struct sctp_nets *net)
6958 {
6959         int i;
6960         struct sctp_tmit_chunk *tp1;
6961
6962         for (i = 0; i < bundle_at; i++) {
6963                 /* off of the send queue */
6964                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6965                 asoc->send_queue_cnt--;
6966                 if (i > 0) {
6967                         /*
6968                          * Any chunk NOT 0 you zap the time chunk 0 gets
6969                          * zapped or set based on if a RTO measurment is
6970                          * needed.
6971                          */
6972                         data_list[i]->do_rtt = 0;
6973                 }
6974                 /* record time */
6975                 data_list[i]->sent_rcv_time = net->last_sent_time;
6976                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6977                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6978                 if (data_list[i]->whoTo == NULL) {
6979                         data_list[i]->whoTo = net;
6980                         atomic_add_int(&net->ref_count, 1);
6981                 }
6982                 /* on to the sent queue */
6983                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6984                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6985                         struct sctp_tmit_chunk *tpp;
6986
6987                         /* need to move back */
6988         back_up_more:
6989                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6990                         if (tpp == NULL) {
6991                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6992                                 goto all_done;
6993                         }
6994                         tp1 = tpp;
6995                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6996                                 goto back_up_more;
6997                         }
6998                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6999                 } else {
7000                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
7001                             data_list[i],
7002                             sctp_next);
7003                 }
7004 all_done:
7005                 /* This does not lower until the cum-ack passes it */
7006                 asoc->sent_queue_cnt++;
7007                 if ((asoc->peers_rwnd <= 0) &&
7008                     (asoc->total_flight == 0) &&
7009                     (bundle_at == 1)) {
7010                         /* Mark the chunk as being a window probe */
7011                         SCTP_STAT_INCR(sctps_windowprobed);
7012                 }
7013 #ifdef SCTP_AUDITING_ENABLED
7014                 sctp_audit_log(0xC2, 3);
7015 #endif
7016                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
7017                 data_list[i]->snd_count = 1;
7018                 data_list[i]->rec.data.chunk_was_revoked = 0;
7019                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7020                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7021                             data_list[i]->whoTo->flight_size,
7022                             data_list[i]->book_size,
7023                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
7024                             data_list[i]->rec.data.tsn);
7025                 }
7026                 sctp_flight_size_increase(data_list[i]);
7027                 sctp_total_flight_increase(stcb, data_list[i]);
7028                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7029                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7030                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7031                 }
7032                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7033                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7034                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7035                         /* SWS sender side engages */
7036                         asoc->peers_rwnd = 0;
7037                 }
7038         }
7039         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7040                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7041         }
7042 }
7043
7044 static void
7045 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7046 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7047     SCTP_UNUSED
7048 #endif
7049 )
7050 {
7051         struct sctp_tmit_chunk *chk, *nchk;
7052
7053         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7054                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7055                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7056                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7057                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7058                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7059                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7060                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7061                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7062                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7063                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7064                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7065                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7066                         /* Stray chunks must be cleaned up */
7067         clean_up_anyway:
7068                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7069                         if (chk->data) {
7070                                 sctp_m_freem(chk->data);
7071                                 chk->data = NULL;
7072                         }
7073                         asoc->ctrl_queue_cnt--;
7074                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7075                                 asoc->fwd_tsn_cnt--;
7076                         sctp_free_a_chunk(stcb, chk, so_locked);
7077                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7078                         /* special handling, we must look into the param */
7079                         if (chk != asoc->str_reset) {
7080                                 goto clean_up_anyway;
7081                         }
7082                 }
7083         }
7084 }
7085
7086 static uint32_t
7087 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7088     uint32_t space_left, uint32_t frag_point, int eeor_on)
7089 {
7090         /*
7091          * Make a decision on if I should split a msg into multiple parts.
7092          * This is only asked of incomplete messages.
7093          */
7094         if (eeor_on) {
7095                 /*
7096                  * If we are doing EEOR we need to always send it if its the
7097                  * entire thing, since it might be all the guy is putting in
7098                  * the hopper.
7099                  */
7100                 if (space_left >= length) {
7101                         /*-
7102                          * If we have data outstanding,
7103                          * we get another chance when the sack
7104                          * arrives to transmit - wait for more data
7105                          */
7106                         if (stcb->asoc.total_flight == 0) {
7107                                 /*
7108                                  * If nothing is in flight, we zero the
7109                                  * packet counter.
7110                                  */
7111                                 return (length);
7112                         }
7113                         return (0);
7114
7115                 } else {
7116                         /* You can fill the rest */
7117                         return (space_left);
7118                 }
7119         }
7120         /*-
7121          * For those strange folk that make the send buffer
7122          * smaller than our fragmentation point, we can't
7123          * get a full msg in so we have to allow splitting.
7124          */
7125         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7126                 return (length);
7127         }
7128         if ((length <= space_left) ||
7129             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7130                 /* Sub-optimial residual don't split in non-eeor mode. */
7131                 return (0);
7132         }
7133         /*
7134          * If we reach here length is larger than the space_left. Do we wish
7135          * to split it for the sake of packet putting together?
7136          */
7137         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7138                 /* Its ok to split it */
7139                 return (min(space_left, frag_point));
7140         }
7141         /* Nope, can't split */
7142         return (0);
7143 }
7144
7145 static uint32_t
7146 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7147     struct sctp_stream_out *strq,
7148     uint32_t space_left,
7149     uint32_t frag_point,
7150     int *giveup,
7151     int eeor_mode,
7152     int *bail,
7153     int so_locked
7154 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7155     SCTP_UNUSED
7156 #endif
7157 )
7158 {
7159         /* Move from the stream to the send_queue keeping track of the total */
7160         struct sctp_association *asoc;
7161         struct sctp_stream_queue_pending *sp;
7162         struct sctp_tmit_chunk *chk;
7163         struct sctp_data_chunk *dchkh = NULL;
7164         struct sctp_idata_chunk *ndchkh = NULL;
7165         uint32_t to_move, length;
7166         int leading;
7167         uint8_t rcv_flags = 0;
7168         uint8_t some_taken;
7169         uint8_t send_lock_up = 0;
7170
7171         SCTP_TCB_LOCK_ASSERT(stcb);
7172         asoc = &stcb->asoc;
7173 one_more_time:
7174         /* sa_ignore FREED_MEMORY */
7175         sp = TAILQ_FIRST(&strq->outqueue);
7176         if (sp == NULL) {
7177                 if (send_lock_up == 0) {
7178                         SCTP_TCB_SEND_LOCK(stcb);
7179                         send_lock_up = 1;
7180                 }
7181                 sp = TAILQ_FIRST(&strq->outqueue);
7182                 if (sp) {
7183                         goto one_more_time;
7184                 }
7185                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7186                     (stcb->asoc.idata_supported == 0) &&
7187                     (strq->last_msg_incomplete)) {
7188                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7189                             strq->sid,
7190                             strq->last_msg_incomplete);
7191                         strq->last_msg_incomplete = 0;
7192                 }
7193                 to_move = 0;
7194                 if (send_lock_up) {
7195                         SCTP_TCB_SEND_UNLOCK(stcb);
7196                         send_lock_up = 0;
7197                 }
7198                 goto out_of;
7199         }
7200         if ((sp->msg_is_complete) && (sp->length == 0)) {
7201                 if (sp->sender_all_done) {
7202                         /*
7203                          * We are doing differed cleanup. Last time through
7204                          * when we took all the data the sender_all_done was
7205                          * not set.
7206                          */
7207                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7208                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7209                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7210                                     sp->sender_all_done,
7211                                     sp->length,
7212                                     sp->msg_is_complete,
7213                                     sp->put_last_out,
7214                                     send_lock_up);
7215                         }
7216                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7217                                 SCTP_TCB_SEND_LOCK(stcb);
7218                                 send_lock_up = 1;
7219                         }
7220                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7221                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7222                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7223                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7224                             (strq->chunks_on_queues == 0) &&
7225                             TAILQ_EMPTY(&strq->outqueue)) {
7226                                 stcb->asoc.trigger_reset = 1;
7227                         }
7228                         if (sp->net) {
7229                                 sctp_free_remote_addr(sp->net);
7230                                 sp->net = NULL;
7231                         }
7232                         if (sp->data) {
7233                                 sctp_m_freem(sp->data);
7234                                 sp->data = NULL;
7235                         }
7236                         sctp_free_a_strmoq(stcb, sp, so_locked);
7237                         /* we can't be locked to it */
7238                         if (send_lock_up) {
7239                                 SCTP_TCB_SEND_UNLOCK(stcb);
7240                                 send_lock_up = 0;
7241                         }
7242                         /* back to get the next msg */
7243                         goto one_more_time;
7244                 } else {
7245                         /*
7246                          * sender just finished this but still holds a
7247                          * reference
7248                          */
7249                         *giveup = 1;
7250                         to_move = 0;
7251                         goto out_of;
7252                 }
7253         } else {
7254                 /* is there some to get */
7255                 if (sp->length == 0) {
7256                         /* no */
7257                         *giveup = 1;
7258                         to_move = 0;
7259                         goto out_of;
7260                 } else if (sp->discard_rest) {
7261                         if (send_lock_up == 0) {
7262                                 SCTP_TCB_SEND_LOCK(stcb);
7263                                 send_lock_up = 1;
7264                         }
7265                         /* Whack down the size */
7266                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7267                         if ((stcb->sctp_socket != NULL) &&
7268                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7269                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7270                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7271                         }
7272                         if (sp->data) {
7273                                 sctp_m_freem(sp->data);
7274                                 sp->data = NULL;
7275                                 sp->tail_mbuf = NULL;
7276                         }
7277                         sp->length = 0;
7278                         sp->some_taken = 1;
7279                         *giveup = 1;
7280                         to_move = 0;
7281                         goto out_of;
7282                 }
7283         }
7284         some_taken = sp->some_taken;
7285 re_look:
7286         length = sp->length;
7287         if (sp->msg_is_complete) {
7288                 /* The message is complete */
7289                 to_move = min(length, frag_point);
7290                 if (to_move == length) {
7291                         /* All of it fits in the MTU */
7292                         if (sp->some_taken) {
7293                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7294                         } else {
7295                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7296                         }
7297                         sp->put_last_out = 1;
7298                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7299                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7300                         }
7301                 } else {
7302                         /* Not all of it fits, we fragment */
7303                         if (sp->some_taken == 0) {
7304                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7305                         }
7306                         sp->some_taken = 1;
7307                 }
7308         } else {
7309                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7310                 if (to_move) {
7311                         /*-
7312                          * We use a snapshot of length in case it
7313                          * is expanding during the compare.
7314                          */
7315                         uint32_t llen;
7316
7317                         llen = length;
7318                         if (to_move >= llen) {
7319                                 to_move = llen;
7320                                 if (send_lock_up == 0) {
7321                                         /*-
7322                                          * We are taking all of an incomplete msg
7323                                          * thus we need a send lock.
7324                                          */
7325                                         SCTP_TCB_SEND_LOCK(stcb);
7326                                         send_lock_up = 1;
7327                                         if (sp->msg_is_complete) {
7328                                                 /*
7329                                                  * the sender finished the
7330                                                  * msg
7331                                                  */
7332                                                 goto re_look;
7333                                         }
7334                                 }
7335                         }
7336                         if (sp->some_taken == 0) {
7337                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7338                                 sp->some_taken = 1;
7339                         }
7340                 } else {
7341                         /* Nothing to take. */
7342                         *giveup = 1;
7343                         to_move = 0;
7344                         goto out_of;
7345                 }
7346         }
7347
7348         /* If we reach here, we can copy out a chunk */
7349         sctp_alloc_a_chunk(stcb, chk);
7350         if (chk == NULL) {
7351                 /* No chunk memory */
7352                 *giveup = 1;
7353                 to_move = 0;
7354                 goto out_of;
7355         }
7356         /*
7357          * Setup for unordered if needed by looking at the user sent info
7358          * flags.
7359          */
7360         if (sp->sinfo_flags & SCTP_UNORDERED) {
7361                 rcv_flags |= SCTP_DATA_UNORDERED;
7362         }
7363         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7364             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7365                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7366         }
7367         /* clear out the chunk before setting up */
7368         memset(chk, 0, sizeof(*chk));
7369         chk->rec.data.rcv_flags = rcv_flags;
7370
7371         if (to_move >= length) {
7372                 /* we think we can steal the whole thing */
7373                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7374                         SCTP_TCB_SEND_LOCK(stcb);
7375                         send_lock_up = 1;
7376                 }
7377                 if (to_move < sp->length) {
7378                         /* bail, it changed */
7379                         goto dont_do_it;
7380                 }
7381                 chk->data = sp->data;
7382                 chk->last_mbuf = sp->tail_mbuf;
7383                 /* register the stealing */
7384                 sp->data = sp->tail_mbuf = NULL;
7385         } else {
7386                 struct mbuf *m;
7387
7388 dont_do_it:
7389                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7390                 chk->last_mbuf = NULL;
7391                 if (chk->data == NULL) {
7392                         sp->some_taken = some_taken;
7393                         sctp_free_a_chunk(stcb, chk, so_locked);
7394                         *bail = 1;
7395                         to_move = 0;
7396                         goto out_of;
7397                 }
7398 #ifdef SCTP_MBUF_LOGGING
7399                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7400                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7401                 }
7402 #endif
7403                 /* Pull off the data */
7404                 m_adj(sp->data, to_move);
7405                 /* Now lets work our way down and compact it */
7406                 m = sp->data;
7407                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7408                         sp->data = SCTP_BUF_NEXT(m);
7409                         SCTP_BUF_NEXT(m) = NULL;
7410                         if (sp->tail_mbuf == m) {
7411                                 /*-
7412                                  * Freeing tail? TSNH since
7413                                  * we supposedly were taking less
7414                                  * than the sp->length.
7415                                  */
7416 #ifdef INVARIANTS
7417                                 panic("Huh, freing tail? - TSNH");
7418 #else
7419                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7420                                 sp->tail_mbuf = sp->data = NULL;
7421                                 sp->length = 0;
7422 #endif
7423
7424                         }
7425                         sctp_m_free(m);
7426                         m = sp->data;
7427                 }
7428         }
7429         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7430                 chk->copy_by_ref = 1;
7431         } else {
7432                 chk->copy_by_ref = 0;
7433         }
7434         /*
7435          * get last_mbuf and counts of mb usage This is ugly but hopefully
7436          * its only one mbuf.
7437          */
7438         if (chk->last_mbuf == NULL) {
7439                 chk->last_mbuf = chk->data;
7440                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7441                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7442                 }
7443         }
7444         if (to_move > length) {
7445                 /*- This should not happen either
7446                  * since we always lower to_move to the size
7447                  * of sp->length if its larger.
7448                  */
7449 #ifdef INVARIANTS
7450                 panic("Huh, how can to_move be larger?");
7451 #else
7452                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7453                 sp->length = 0;
7454 #endif
7455         } else {
7456                 atomic_subtract_int(&sp->length, to_move);
7457         }
7458         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7459         if (M_LEADINGSPACE(chk->data) < leading) {
7460                 /* Not enough room for a chunk header, get some */
7461                 struct mbuf *m;
7462
7463                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7464                 if (m == NULL) {
7465                         /*
7466                          * we're in trouble here. _PREPEND below will free
7467                          * all the data if there is no leading space, so we
7468                          * must put the data back and restore.
7469                          */
7470                         if (send_lock_up == 0) {
7471                                 SCTP_TCB_SEND_LOCK(stcb);
7472                                 send_lock_up = 1;
7473                         }
7474                         if (sp->data == NULL) {
7475                                 /* unsteal the data */
7476                                 sp->data = chk->data;
7477                                 sp->tail_mbuf = chk->last_mbuf;
7478                         } else {
7479                                 struct mbuf *m_tmp;
7480
7481                                 /* reassemble the data */
7482                                 m_tmp = sp->data;
7483                                 sp->data = chk->data;
7484                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7485                         }
7486                         sp->some_taken = some_taken;
7487                         atomic_add_int(&sp->length, to_move);
7488                         chk->data = NULL;
7489                         *bail = 1;
7490                         sctp_free_a_chunk(stcb, chk, so_locked);
7491                         to_move = 0;
7492                         goto out_of;
7493                 } else {
7494                         SCTP_BUF_LEN(m) = 0;
7495                         SCTP_BUF_NEXT(m) = chk->data;
7496                         chk->data = m;
7497                         M_ALIGN(chk->data, 4);
7498                 }
7499         }
7500         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7501         if (chk->data == NULL) {
7502                 /* HELP, TSNH since we assured it would not above? */
7503 #ifdef INVARIANTS
7504                 panic("prepend failes HELP?");
7505 #else
7506                 SCTP_PRINTF("prepend fails HELP?\n");
7507                 sctp_free_a_chunk(stcb, chk, so_locked);
7508 #endif
7509                 *bail = 1;
7510                 to_move = 0;
7511                 goto out_of;
7512         }
7513         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7514         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7515         chk->book_size_scale = 0;
7516         chk->sent = SCTP_DATAGRAM_UNSENT;
7517
7518         chk->flags = 0;
7519         chk->asoc = &stcb->asoc;
7520         chk->pad_inplace = 0;
7521         chk->no_fr_allowed = 0;
7522         if (stcb->asoc.idata_supported == 0) {
7523                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7524                         /* Just use 0. The receiver ignores the values. */
7525                         chk->rec.data.mid = 0;
7526                 } else {
7527                         chk->rec.data.mid = strq->next_mid_ordered;
7528                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7529                                 strq->next_mid_ordered++;
7530                         }
7531                 }
7532         } else {
7533                 if (rcv_flags & SCTP_DATA_UNORDERED) {
7534                         chk->rec.data.mid = strq->next_mid_unordered;
7535                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7536                                 strq->next_mid_unordered++;
7537                         }
7538                 } else {
7539                         chk->rec.data.mid = strq->next_mid_ordered;
7540                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7541                                 strq->next_mid_ordered++;
7542                         }
7543                 }
7544         }
7545         chk->rec.data.sid = sp->sid;
7546         chk->rec.data.ppid = sp->ppid;
7547         chk->rec.data.context = sp->context;
7548         chk->rec.data.doing_fast_retransmit = 0;
7549
7550         chk->rec.data.timetodrop = sp->ts;
7551         chk->flags = sp->act_flags;
7552
7553         if (sp->net) {
7554                 chk->whoTo = sp->net;
7555                 atomic_add_int(&chk->whoTo->ref_count, 1);
7556         } else
7557                 chk->whoTo = NULL;
7558
7559         if (sp->holds_key_ref) {
7560                 chk->auth_keyid = sp->auth_keyid;
7561                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7562                 chk->holds_key_ref = 1;
7563         }
7564         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7565         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7566                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7567                     (uint32_t)(uintptr_t)stcb, sp->length,
7568                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7569                     chk->rec.data.tsn);
7570         }
7571         if (stcb->asoc.idata_supported == 0) {
7572                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
7573         } else {
7574                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7575         }
7576         /*
7577          * Put the rest of the things in place now. Size was done earlier in
7578          * previous loop prior to padding.
7579          */
7580
7581 #ifdef SCTP_ASOCLOG_OF_TSNS
7582         SCTP_TCB_LOCK_ASSERT(stcb);
7583         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7584                 asoc->tsn_out_at = 0;
7585                 asoc->tsn_out_wrapped = 1;
7586         }
7587         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7588         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7589         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7590         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7591         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7592         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7593         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7594         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7595         asoc->tsn_out_at++;
7596 #endif
7597         if (stcb->asoc.idata_supported == 0) {
7598                 dchkh->ch.chunk_type = SCTP_DATA;
7599                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7600                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7601                 dchkh->dp.sid = htons(strq->sid);
7602                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7603                 dchkh->dp.ppid = chk->rec.data.ppid;
7604                 dchkh->ch.chunk_length = htons(chk->send_size);
7605         } else {
7606                 ndchkh->ch.chunk_type = SCTP_IDATA;
7607                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7608                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7609                 ndchkh->dp.sid = htons(strq->sid);
7610                 ndchkh->dp.reserved = htons(0);
7611                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
7612                 if (sp->fsn == 0)
7613                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7614                 else
7615                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7616                 sp->fsn++;
7617                 ndchkh->ch.chunk_length = htons(chk->send_size);
7618         }
7619         /* Now advance the chk->send_size by the actual pad needed. */
7620         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7621                 /* need a pad */
7622                 struct mbuf *lm;
7623                 int pads;
7624
7625                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7626                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7627                 if (lm != NULL) {
7628                         chk->last_mbuf = lm;
7629                         chk->pad_inplace = 1;
7630                 }
7631                 chk->send_size += pads;
7632         }
7633         if (PR_SCTP_ENABLED(chk->flags)) {
7634                 asoc->pr_sctp_cnt++;
7635         }
7636         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7637                 /* All done pull and kill the message */
7638                 if (sp->put_last_out == 0) {
7639                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7640                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7641                             sp->sender_all_done,
7642                             sp->length,
7643                             sp->msg_is_complete,
7644                             sp->put_last_out,
7645                             send_lock_up);
7646                 }
7647                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7648                         SCTP_TCB_SEND_LOCK(stcb);
7649                         send_lock_up = 1;
7650                 }
7651                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7652                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7653                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7654                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7655                     (strq->chunks_on_queues == 0) &&
7656                     TAILQ_EMPTY(&strq->outqueue)) {
7657                         stcb->asoc.trigger_reset = 1;
7658                 }
7659                 if (sp->net) {
7660                         sctp_free_remote_addr(sp->net);
7661                         sp->net = NULL;
7662                 }
7663                 if (sp->data) {
7664                         sctp_m_freem(sp->data);
7665                         sp->data = NULL;
7666                 }
7667                 sctp_free_a_strmoq(stcb, sp, so_locked);
7668         }
7669         asoc->chunks_on_out_queue++;
7670         strq->chunks_on_queues++;
7671         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7672         asoc->send_queue_cnt++;
7673 out_of:
7674         if (send_lock_up) {
7675                 SCTP_TCB_SEND_UNLOCK(stcb);
7676         }
7677         return (to_move);
7678 }
7679
7680
7681 static void
7682 sctp_fill_outqueue(struct sctp_tcb *stcb,
7683     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7684 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7685     SCTP_UNUSED
7686 #endif
7687 )
7688 {
7689         struct sctp_association *asoc;
7690         struct sctp_stream_out *strq;
7691         uint32_t space_left, moved, total_moved;
7692         int bail, giveup;
7693
7694         SCTP_TCB_LOCK_ASSERT(stcb);
7695         asoc = &stcb->asoc;
7696         total_moved = 0;
7697         switch (net->ro._l_addr.sa.sa_family) {
7698 #ifdef INET
7699         case AF_INET:
7700                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7701                 break;
7702 #endif
7703 #ifdef INET6
7704         case AF_INET6:
7705                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
7706                 break;
7707 #endif
7708         default:
7709                 /* TSNH */
7710                 space_left = net->mtu;
7711                 break;
7712         }
7713         /* Need an allowance for the data chunk header too */
7714         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7715
7716         /* must make even word boundary */
7717         space_left &= 0xfffffffc;
7718         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7719         giveup = 0;
7720         bail = 0;
7721         while ((space_left > 0) && (strq != NULL)) {
7722                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7723                     &giveup, eeor_mode, &bail, so_locked);
7724                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7725                 if ((giveup != 0) || (bail != 0)) {
7726                         break;
7727                 }
7728                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7729                 total_moved += moved;
7730                 space_left -= moved;
7731                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7732                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7733                 } else {
7734                         space_left = 0;
7735                 }
7736                 space_left &= 0xfffffffc;
7737         }
7738         if (bail != 0)
7739                 *quit_now = 1;
7740
7741         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7742
7743         if (total_moved == 0) {
7744                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7745                     (net == stcb->asoc.primary_destination)) {
7746                         /* ran dry for primary network net */
7747                         SCTP_STAT_INCR(sctps_primary_randry);
7748                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7749                         /* ran dry with CMT on */
7750                         SCTP_STAT_INCR(sctps_cmt_randry);
7751                 }
7752         }
7753 }
7754
7755 void
7756 sctp_fix_ecn_echo(struct sctp_association *asoc)
7757 {
7758         struct sctp_tmit_chunk *chk;
7759
7760         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7761                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7762                         chk->sent = SCTP_DATAGRAM_UNSENT;
7763                 }
7764         }
7765 }
7766
7767 void
7768 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7769 {
7770         struct sctp_association *asoc;
7771         struct sctp_tmit_chunk *chk;
7772         struct sctp_stream_queue_pending *sp;
7773         unsigned int i;
7774
7775         if (net == NULL) {
7776                 return;
7777         }
7778         asoc = &stcb->asoc;
7779         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7780                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7781                         if (sp->net == net) {
7782                                 sctp_free_remote_addr(sp->net);
7783                                 sp->net = NULL;
7784                         }
7785                 }
7786         }
7787         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7788                 if (chk->whoTo == net) {
7789                         sctp_free_remote_addr(chk->whoTo);
7790                         chk->whoTo = NULL;
7791                 }
7792         }
7793 }
7794
7795 int
7796 sctp_med_chunk_output(struct sctp_inpcb *inp,
7797     struct sctp_tcb *stcb,
7798     struct sctp_association *asoc,
7799     int *num_out,
7800     int *reason_code,
7801     int control_only, int from_where,
7802     struct timeval *now, int *now_filled, int frag_point, int so_locked
7803 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7804     SCTP_UNUSED
7805 #endif
7806 )
7807 {
7808         /**
7809          * Ok this is the generic chunk service queue. we must do the
7810          * following:
7811          * - Service the stream queue that is next, moving any
7812          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7813          *   LAST to the out queue in one pass) and assigning TSN's. This
7814          *   only applys though if the peer does not support NDATA. For NDATA
7815          *   chunks its ok to not send the entire message ;-)
7816          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7817          *   fomulate and send the low level chunks. Making sure to combine
7818          *   any control in the control chunk queue also.
7819          */
7820         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7821         struct mbuf *outchain, *endoutchain;
7822         struct sctp_tmit_chunk *chk, *nchk;
7823
7824         /* temp arrays for unlinking */
7825         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7826         int no_fragmentflg, error;
7827         unsigned int max_rwnd_per_dest, max_send_per_dest;
7828         int one_chunk, hbflag, skip_data_for_this_net;
7829         int asconf, cookie, no_out_cnt;
7830         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7831         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7832         int tsns_sent = 0;
7833         uint32_t auth_offset = 0;
7834         struct sctp_auth_chunk *auth = NULL;
7835         uint16_t auth_keyid;
7836         int override_ok = 1;
7837         int skip_fill_up = 0;
7838         int data_auth_reqd = 0;
7839
7840         /*
7841          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7842          * destination.
7843          */
7844         int quit_now = 0;
7845
7846         *num_out = 0;
7847         *reason_code = 0;
7848         auth_keyid = stcb->asoc.authinfo.active_keyid;
7849         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7850             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7851             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7852                 eeor_mode = 1;
7853         } else {
7854                 eeor_mode = 0;
7855         }
7856         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7857         /*
7858          * First lets prime the pump. For each destination, if there is room
7859          * in the flight size, attempt to pull an MTU's worth out of the
7860          * stream queues into the general send_queue
7861          */
7862 #ifdef SCTP_AUDITING_ENABLED
7863         sctp_audit_log(0xC2, 2);
7864 #endif
7865         SCTP_TCB_LOCK_ASSERT(stcb);
7866         hbflag = 0;
7867         if (control_only)
7868                 no_data_chunks = 1;
7869         else
7870                 no_data_chunks = 0;
7871
7872         /* Nothing to possible to send? */
7873         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7874             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7875             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7876             TAILQ_EMPTY(&asoc->send_queue) &&
7877             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7878 nothing_to_send:
7879                 *reason_code = 9;
7880                 return (0);
7881         }
7882         if (asoc->peers_rwnd == 0) {
7883                 /* No room in peers rwnd */
7884                 *reason_code = 1;
7885                 if (asoc->total_flight > 0) {
7886                         /* we are allowed one chunk in flight */
7887                         no_data_chunks = 1;
7888                 }
7889         }
7890         if (stcb->asoc.ecn_echo_cnt_onq) {
7891                 /* Record where a sack goes, if any */
7892                 if (no_data_chunks &&
7893                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7894                         /* Nothing but ECNe to send - we don't do that */
7895                         goto nothing_to_send;
7896                 }
7897                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7898                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7899                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7900                                 sack_goes_to = chk->whoTo;
7901                                 break;
7902                         }
7903                 }
7904         }
7905         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7906         if (stcb->sctp_socket)
7907                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7908         else
7909                 max_send_per_dest = 0;
7910         if (no_data_chunks == 0) {
7911                 /* How many non-directed chunks are there? */
7912                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7913                         if (chk->whoTo == NULL) {
7914                                 /*
7915                                  * We already have non-directed chunks on
7916                                  * the queue, no need to do a fill-up.
7917                                  */
7918                                 skip_fill_up = 1;
7919                                 break;
7920                         }
7921                 }
7922
7923         }
7924         if ((no_data_chunks == 0) &&
7925             (skip_fill_up == 0) &&
7926             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7927                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7928                         /*
7929                          * This for loop we are in takes in each net, if
7930                          * its's got space in cwnd and has data sent to it
7931                          * (when CMT is off) then it calls
7932                          * sctp_fill_outqueue for the net. This gets data on
7933                          * the send queue for that network.
7934                          *
7935                          * In sctp_fill_outqueue TSN's are assigned and data
7936                          * is copied out of the stream buffers. Note mostly
7937                          * copy by reference (we hope).
7938                          */
7939                         net->window_probe = 0;
7940                         if ((net != stcb->asoc.alternate) &&
7941                             ((net->dest_state & SCTP_ADDR_PF) ||
7942                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7943                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7944                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7945                                         sctp_log_cwnd(stcb, net, 1,
7946                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7947                                 }
7948                                 continue;
7949                         }
7950                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7951                             (net->flight_size == 0)) {
7952                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7953                         }
7954                         if (net->flight_size >= net->cwnd) {
7955                                 /* skip this network, no room - can't fill */
7956                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7957                                         sctp_log_cwnd(stcb, net, 3,
7958                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7959                                 }
7960                                 continue;
7961                         }
7962                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7963                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7964                         }
7965                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7966                         if (quit_now) {
7967                                 /* memory alloc failure */
7968                                 no_data_chunks = 1;
7969                                 break;
7970                         }
7971                 }
7972         }
7973         /* now service each destination and send out what we can for it */
7974         /* Nothing to send? */
7975         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7976             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7977             TAILQ_EMPTY(&asoc->send_queue)) {
7978                 *reason_code = 8;
7979                 return (0);
7980         }
7981         if (asoc->sctp_cmt_on_off > 0) {
7982                 /* get the last start point */
7983                 start_at = asoc->last_net_cmt_send_started;
7984                 if (start_at == NULL) {
7985                         /* null so to beginning */
7986                         start_at = TAILQ_FIRST(&asoc->nets);
7987                 } else {
7988                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7989                         if (start_at == NULL) {
7990                                 start_at = TAILQ_FIRST(&asoc->nets);
7991                         }
7992                 }
7993                 asoc->last_net_cmt_send_started = start_at;
7994         } else {
7995                 start_at = TAILQ_FIRST(&asoc->nets);
7996         }
7997         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7998                 if (chk->whoTo == NULL) {
7999                         if (asoc->alternate) {
8000                                 chk->whoTo = asoc->alternate;
8001                         } else {
8002                                 chk->whoTo = asoc->primary_destination;
8003                         }
8004                         atomic_add_int(&chk->whoTo->ref_count, 1);
8005                 }
8006         }
8007         old_start_at = NULL;
8008 again_one_more_time:
8009         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8010                 /* how much can we send? */
8011                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8012                 if (old_start_at && (old_start_at == net)) {
8013                         /* through list ocmpletely. */
8014                         break;
8015                 }
8016                 tsns_sent = 0xa;
8017                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8018                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8019                     (net->flight_size >= net->cwnd)) {
8020                         /*
8021                          * Nothing on control or asconf and flight is full,
8022                          * we can skip even in the CMT case.
8023                          */
8024                         continue;
8025                 }
8026                 bundle_at = 0;
8027                 endoutchain = outchain = NULL;
8028                 no_fragmentflg = 1;
8029                 one_chunk = 0;
8030                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8031                         skip_data_for_this_net = 1;
8032                 } else {
8033                         skip_data_for_this_net = 0;
8034                 }
8035                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8036 #ifdef INET
8037                 case AF_INET:
8038                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8039                         break;
8040 #endif
8041 #ifdef INET6
8042                 case AF_INET6:
8043                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
8044                         break;
8045 #endif
8046                 default:
8047                         /* TSNH */
8048                         mtu = net->mtu;
8049                         break;
8050                 }
8051                 mx_mtu = mtu;
8052                 to_out = 0;
8053                 if (mtu > asoc->peers_rwnd) {
8054                         if (asoc->total_flight > 0) {
8055                                 /* We have a packet in flight somewhere */
8056                                 r_mtu = asoc->peers_rwnd;
8057                         } else {
8058                                 /* We are always allowed to send one MTU out */
8059                                 one_chunk = 1;
8060                                 r_mtu = mtu;
8061                         }
8062                 } else {
8063                         r_mtu = mtu;
8064                 }
8065                 error = 0;
8066                 /************************/
8067                 /* ASCONF transmission */
8068                 /************************/
8069                 /* Now first lets go through the asconf queue */
8070                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8071                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8072                                 continue;
8073                         }
8074                         if (chk->whoTo == NULL) {
8075                                 if (asoc->alternate == NULL) {
8076                                         if (asoc->primary_destination != net) {
8077                                                 break;
8078                                         }
8079                                 } else {
8080                                         if (asoc->alternate != net) {
8081                                                 break;
8082                                         }
8083                                 }
8084                         } else {
8085                                 if (chk->whoTo != net) {
8086                                         break;
8087                                 }
8088                         }
8089                         if (chk->data == NULL) {
8090                                 break;
8091                         }
8092                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8093                             chk->sent != SCTP_DATAGRAM_RESEND) {
8094                                 break;
8095                         }
8096                         /*
8097                          * if no AUTH is yet included and this chunk
8098                          * requires it, make sure to account for it.  We
8099                          * don't apply the size until the AUTH chunk is
8100                          * actually added below in case there is no room for
8101                          * this chunk. NOTE: we overload the use of "omtu"
8102                          * here
8103                          */
8104                         if ((auth == NULL) &&
8105                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8106                             stcb->asoc.peer_auth_chunks)) {
8107                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8108                         } else
8109                                 omtu = 0;
8110                         /* Here we do NOT factor the r_mtu */
8111                         if ((chk->send_size < (int)(mtu - omtu)) ||
8112                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8113                                 /*
8114                                  * We probably should glom the mbuf chain
8115                                  * from the chk->data for control but the
8116                                  * problem is it becomes yet one more level
8117                                  * of tracking to do if for some reason
8118                                  * output fails. Then I have got to
8119                                  * reconstruct the merged control chain.. el
8120                                  * yucko.. for now we take the easy way and
8121                                  * do the copy
8122                                  */
8123                                 /*
8124                                  * Add an AUTH chunk, if chunk requires it
8125                                  * save the offset into the chain for AUTH
8126                                  */
8127                                 if ((auth == NULL) &&
8128                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8129                                     stcb->asoc.peer_auth_chunks))) {
8130                                         outchain = sctp_add_auth_chunk(outchain,
8131                                             &endoutchain,
8132                                             &auth,
8133                                             &auth_offset,
8134                                             stcb,
8135                                             chk->rec.chunk_id.id);
8136                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8137                                 }
8138                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8139                                     (int)chk->rec.chunk_id.can_take_data,
8140                                     chk->send_size, chk->copy_by_ref);
8141                                 if (outchain == NULL) {
8142                                         *reason_code = 8;
8143                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8144                                         return (ENOMEM);
8145                                 }
8146                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8147                                 /* update our MTU size */
8148                                 if (mtu > (chk->send_size + omtu))
8149                                         mtu -= (chk->send_size + omtu);
8150                                 else
8151                                         mtu = 0;
8152                                 to_out += (chk->send_size + omtu);
8153                                 /* Do clear IP_DF ? */
8154                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8155                                         no_fragmentflg = 0;
8156                                 }
8157                                 if (chk->rec.chunk_id.can_take_data)
8158                                         chk->data = NULL;
8159                                 /*
8160                                  * set hb flag since we can use these for
8161                                  * RTO
8162                                  */
8163                                 hbflag = 1;
8164                                 asconf = 1;
8165                                 /*
8166                                  * should sysctl this: don't bundle data
8167                                  * with ASCONF since it requires AUTH
8168                                  */
8169                                 no_data_chunks = 1;
8170                                 chk->sent = SCTP_DATAGRAM_SENT;
8171                                 if (chk->whoTo == NULL) {
8172                                         chk->whoTo = net;
8173                                         atomic_add_int(&net->ref_count, 1);
8174                                 }
8175                                 chk->snd_count++;
8176                                 if (mtu == 0) {
8177                                         /*
8178                                          * Ok we are out of room but we can
8179                                          * output without effecting the
8180                                          * flight size since this little guy
8181                                          * is a control only packet.
8182                                          */
8183                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8184                                         /*
8185                                          * do NOT clear the asconf flag as
8186                                          * it is used to do appropriate
8187                                          * source address selection.
8188                                          */
8189                                         if (*now_filled == 0) {
8190                                                 (void)SCTP_GETTIME_TIMEVAL(now);
8191                                                 *now_filled = 1;
8192                                         }
8193                                         net->last_sent_time = *now;
8194                                         hbflag = 0;
8195                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8196                                             (struct sockaddr *)&net->ro._l_addr,
8197                                             outchain, auth_offset, auth,
8198                                             stcb->asoc.authinfo.active_keyid,
8199                                             no_fragmentflg, 0, asconf,
8200                                             inp->sctp_lport, stcb->rport,
8201                                             htonl(stcb->asoc.peer_vtag),
8202                                             net->port, NULL,
8203                                             0, 0,
8204                                             so_locked))) {
8205                                                 /*
8206                                                  * error, we could not
8207                                                  * output
8208                                                  */
8209                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8210                                                 if (from_where == 0) {
8211                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8212                                                 }
8213                                                 if (error == ENOBUFS) {
8214                                                         asoc->ifp_had_enobuf = 1;
8215                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8216                                                 }
8217                                                 /* error, could not output */
8218                                                 if (error == EHOSTUNREACH) {
8219                                                         /*
8220                                                          * Destination went
8221                                                          * unreachable
8222                                                          * during this send
8223                                                          */
8224                                                         sctp_move_chunks_from_net(stcb, net);
8225                                                 }
8226                                                 *reason_code = 7;
8227                                                 break;
8228                                         } else {
8229                                                 asoc->ifp_had_enobuf = 0;
8230                                         }
8231                                         /*
8232                                          * increase the number we sent, if a
8233                                          * cookie is sent we don't tell them
8234                                          * any was sent out.
8235                                          */
8236                                         outchain = endoutchain = NULL;
8237                                         auth = NULL;
8238                                         auth_offset = 0;
8239                                         if (!no_out_cnt)
8240                                                 *num_out += ctl_cnt;
8241                                         /* recalc a clean slate and setup */
8242                                         switch (net->ro._l_addr.sa.sa_family) {
8243 #ifdef INET
8244                                         case AF_INET:
8245                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8246                                                 break;
8247 #endif
8248 #ifdef INET6
8249                                         case AF_INET6:
8250                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8251                                                 break;
8252 #endif
8253                                         default:
8254                                                 /* TSNH */
8255                                                 mtu = net->mtu;
8256                                                 break;
8257                                         }
8258                                         to_out = 0;
8259                                         no_fragmentflg = 1;
8260                                 }
8261                         }
8262                 }
8263                 if (error != 0) {
8264                         /* try next net */
8265                         continue;
8266                 }
8267                 /************************/
8268                 /* Control transmission */
8269                 /************************/
8270                 /* Now first lets go through the control queue */
8271                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8272                         if ((sack_goes_to) &&
8273                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8274                             (chk->whoTo != sack_goes_to)) {
8275                                 /*
8276                                  * if we have a sack in queue, and we are
8277                                  * looking at an ecn echo that is NOT queued
8278                                  * to where the sack is going..
8279                                  */
8280                                 if (chk->whoTo == net) {
8281                                         /*
8282                                          * Don't transmit it to where its
8283                                          * going (current net)
8284                                          */
8285                                         continue;
8286                                 } else if (sack_goes_to == net) {
8287                                         /*
8288                                          * But do transmit it to this
8289                                          * address
8290                                          */
8291                                         goto skip_net_check;
8292                                 }
8293                         }
8294                         if (chk->whoTo == NULL) {
8295                                 if (asoc->alternate == NULL) {
8296                                         if (asoc->primary_destination != net) {
8297                                                 continue;
8298                                         }
8299                                 } else {
8300                                         if (asoc->alternate != net) {
8301                                                 continue;
8302                                         }
8303                                 }
8304                         } else {
8305                                 if (chk->whoTo != net) {
8306                                         continue;
8307                                 }
8308                         }
8309         skip_net_check:
8310                         if (chk->data == NULL) {
8311                                 continue;
8312                         }
8313                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8314                                 /*
8315                                  * It must be unsent. Cookies and ASCONF's
8316                                  * hang around but there timers will force
8317                                  * when marked for resend.
8318                                  */
8319                                 continue;
8320                         }
8321                         /*
8322                          * if no AUTH is yet included and this chunk
8323                          * requires it, make sure to account for it.  We
8324                          * don't apply the size until the AUTH chunk is
8325                          * actually added below in case there is no room for
8326                          * this chunk. NOTE: we overload the use of "omtu"
8327                          * here
8328                          */
8329                         if ((auth == NULL) &&
8330                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8331                             stcb->asoc.peer_auth_chunks)) {
8332                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8333                         } else
8334                                 omtu = 0;
8335                         /* Here we do NOT factor the r_mtu */
8336                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8337                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8338                                 /*
8339                                  * We probably should glom the mbuf chain
8340                                  * from the chk->data for control but the
8341                                  * problem is it becomes yet one more level
8342                                  * of tracking to do if for some reason
8343                                  * output fails. Then I have got to
8344                                  * reconstruct the merged control chain.. el
8345                                  * yucko.. for now we take the easy way and
8346                                  * do the copy
8347                                  */
8348                                 /*
8349                                  * Add an AUTH chunk, if chunk requires it
8350                                  * save the offset into the chain for AUTH
8351                                  */
8352                                 if ((auth == NULL) &&
8353                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8354                                     stcb->asoc.peer_auth_chunks))) {
8355                                         outchain = sctp_add_auth_chunk(outchain,
8356                                             &endoutchain,
8357                                             &auth,
8358                                             &auth_offset,
8359                                             stcb,
8360                                             chk->rec.chunk_id.id);
8361                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8362                                 }
8363                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8364                                     (int)chk->rec.chunk_id.can_take_data,
8365                                     chk->send_size, chk->copy_by_ref);
8366                                 if (outchain == NULL) {
8367                                         *reason_code = 8;
8368                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8369                                         return (ENOMEM);
8370                                 }
8371                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8372                                 /* update our MTU size */
8373                                 if (mtu > (chk->send_size + omtu))
8374                                         mtu -= (chk->send_size + omtu);
8375                                 else
8376                                         mtu = 0;
8377                                 to_out += (chk->send_size + omtu);
8378                                 /* Do clear IP_DF ? */
8379                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8380                                         no_fragmentflg = 0;
8381                                 }
8382                                 if (chk->rec.chunk_id.can_take_data)
8383                                         chk->data = NULL;
8384                                 /* Mark things to be removed, if needed */
8385                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8386                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8387                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8388                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8389                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8390                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8391                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8392                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8393                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8394                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8395                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8396                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8397                                                 hbflag = 1;
8398                                         }
8399                                         /* remove these chunks at the end */
8400                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8401                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8402                                                 /* turn off the timer */
8403                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8404                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8405                                                             inp, stcb, net,
8406                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8407                                                 }
8408                                         }
8409                                         ctl_cnt++;
8410                                 } else {
8411                                         /*
8412                                          * Other chunks, since they have
8413                                          * timers running (i.e. COOKIE) we
8414                                          * just "trust" that it gets sent or
8415                                          * retransmitted.
8416                                          */
8417                                         ctl_cnt++;
8418                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8419                                                 cookie = 1;
8420                                                 no_out_cnt = 1;
8421                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8422                                                 /*
8423                                                  * Increment ecne send count
8424                                                  * here this means we may be
8425                                                  * over-zealous in our
8426                                                  * counting if the send
8427                                                  * fails, but its the best
8428                                                  * place to do it (we used
8429                                                  * to do it in the queue of
8430                                                  * the chunk, but that did
8431                                                  * not tell how many times
8432                                                  * it was sent.
8433                                                  */
8434                                                 SCTP_STAT_INCR(sctps_sendecne);
8435                                         }
8436                                         chk->sent = SCTP_DATAGRAM_SENT;
8437                                         if (chk->whoTo == NULL) {
8438                                                 chk->whoTo = net;
8439                                                 atomic_add_int(&net->ref_count, 1);
8440                                         }
8441                                         chk->snd_count++;
8442                                 }
8443                                 if (mtu == 0) {
8444                                         /*
8445                                          * Ok we are out of room but we can
8446                                          * output without effecting the
8447                                          * flight size since this little guy
8448                                          * is a control only packet.
8449                                          */
8450                                         if (asconf) {
8451                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8452                                                 /*
8453                                                  * do NOT clear the asconf
8454                                                  * flag as it is used to do
8455                                                  * appropriate source
8456                                                  * address selection.
8457                                                  */
8458                                         }
8459                                         if (cookie) {
8460                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8461                                                 cookie = 0;
8462                                         }
8463                                         /* Only HB or ASCONF advances time */
8464                                         if (hbflag) {
8465                                                 if (*now_filled == 0) {
8466                                                         (void)SCTP_GETTIME_TIMEVAL(now);
8467                                                         *now_filled = 1;
8468                                                 }
8469                                                 net->last_sent_time = *now;
8470                                                 hbflag = 0;
8471                                         }
8472                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8473                                             (struct sockaddr *)&net->ro._l_addr,
8474                                             outchain,
8475                                             auth_offset, auth,
8476                                             stcb->asoc.authinfo.active_keyid,
8477                                             no_fragmentflg, 0, asconf,
8478                                             inp->sctp_lport, stcb->rport,
8479                                             htonl(stcb->asoc.peer_vtag),
8480                                             net->port, NULL,
8481                                             0, 0,
8482                                             so_locked))) {
8483                                                 /*
8484                                                  * error, we could not
8485                                                  * output
8486                                                  */
8487                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8488                                                 if (from_where == 0) {
8489                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8490                                                 }
8491                                                 if (error == ENOBUFS) {
8492                                                         asoc->ifp_had_enobuf = 1;
8493                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8494                                                 }
8495                                                 if (error == EHOSTUNREACH) {
8496                                                         /*
8497                                                          * Destination went
8498                                                          * unreachable
8499                                                          * during this send
8500                                                          */
8501                                                         sctp_move_chunks_from_net(stcb, net);
8502                                                 }
8503                                                 *reason_code = 7;
8504                                                 break;
8505                                         } else {
8506                                                 asoc->ifp_had_enobuf = 0;
8507                                         }
8508                                         /*
8509                                          * increase the number we sent, if a
8510                                          * cookie is sent we don't tell them
8511                                          * any was sent out.
8512                                          */
8513                                         outchain = endoutchain = NULL;
8514                                         auth = NULL;
8515                                         auth_offset = 0;
8516                                         if (!no_out_cnt)
8517                                                 *num_out += ctl_cnt;
8518                                         /* recalc a clean slate and setup */
8519                                         switch (net->ro._l_addr.sa.sa_family) {
8520 #ifdef INET
8521                                         case AF_INET:
8522                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8523                                                 break;
8524 #endif
8525 #ifdef INET6
8526                                         case AF_INET6:
8527                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8528                                                 break;
8529 #endif
8530                                         default:
8531                                                 /* TSNH */
8532                                                 mtu = net->mtu;
8533                                                 break;
8534                                         }
8535                                         to_out = 0;
8536                                         no_fragmentflg = 1;
8537                                 }
8538                         }
8539                 }
8540                 if (error != 0) {
8541                         /* try next net */
8542                         continue;
8543                 }
8544                 /* JRI: if dest is in PF state, do not send data to it */
8545                 if ((asoc->sctp_cmt_on_off > 0) &&
8546                     (net != stcb->asoc.alternate) &&
8547                     (net->dest_state & SCTP_ADDR_PF)) {
8548                         goto no_data_fill;
8549                 }
8550                 if (net->flight_size >= net->cwnd) {
8551                         goto no_data_fill;
8552                 }
8553                 if ((asoc->sctp_cmt_on_off > 0) &&
8554                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8555                     (net->flight_size > max_rwnd_per_dest)) {
8556                         goto no_data_fill;
8557                 }
8558                 /*
8559                  * We need a specific accounting for the usage of the send
8560                  * buffer. We also need to check the number of messages per
8561                  * net. For now, this is better than nothing and it disabled
8562                  * by default...
8563                  */
8564                 if ((asoc->sctp_cmt_on_off > 0) &&
8565                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8566                     (max_send_per_dest > 0) &&
8567                     (net->flight_size > max_send_per_dest)) {
8568                         goto no_data_fill;
8569                 }
8570                 /*********************/
8571                 /* Data transmission */
8572                 /*********************/
8573                 /*
8574                  * if AUTH for DATA is required and no AUTH has been added
8575                  * yet, account for this in the mtu now... if no data can be
8576                  * bundled, this adjustment won't matter anyways since the
8577                  * packet will be going out...
8578                  */
8579                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8580                     stcb->asoc.peer_auth_chunks);
8581                 if (data_auth_reqd && (auth == NULL)) {
8582                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8583                 }
8584                 /* now lets add any data within the MTU constraints */
8585                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8586 #ifdef INET
8587                 case AF_INET:
8588                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8589                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8590                         else
8591                                 omtu = 0;
8592                         break;
8593 #endif
8594 #ifdef INET6
8595                 case AF_INET6:
8596                         if (net->mtu > SCTP_MIN_OVERHEAD)
8597                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
8598                         else
8599                                 omtu = 0;
8600                         break;
8601 #endif
8602                 default:
8603                         /* TSNH */
8604                         omtu = 0;
8605                         break;
8606                 }
8607                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8608                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8609                     (skip_data_for_this_net == 0)) ||
8610                     (cookie)) {
8611                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8612                                 if (no_data_chunks) {
8613                                         /* let only control go out */
8614                                         *reason_code = 1;
8615                                         break;
8616                                 }
8617                                 if (net->flight_size >= net->cwnd) {
8618                                         /* skip this net, no room for data */
8619                                         *reason_code = 2;
8620                                         break;
8621                                 }
8622                                 if ((chk->whoTo != NULL) &&
8623                                     (chk->whoTo != net)) {
8624                                         /* Don't send the chunk on this net */
8625                                         continue;
8626                                 }
8627                                 if (asoc->sctp_cmt_on_off == 0) {
8628                                         if ((asoc->alternate) &&
8629                                             (asoc->alternate != net) &&
8630                                             (chk->whoTo == NULL)) {
8631                                                 continue;
8632                                         } else if ((net != asoc->primary_destination) &&
8633                                                     (asoc->alternate == NULL) &&
8634                                             (chk->whoTo == NULL)) {
8635                                                 continue;
8636                                         }
8637                                 }
8638                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8639                                         /*-
8640                                          * strange, we have a chunk that is
8641                                          * to big for its destination and
8642                                          * yet no fragment ok flag.
8643                                          * Something went wrong when the
8644                                          * PMTU changed...we did not mark
8645                                          * this chunk for some reason?? I
8646                                          * will fix it here by letting IP
8647                                          * fragment it for now and printing
8648                                          * a warning. This really should not
8649                                          * happen ...
8650                                          */
8651                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8652                                             chk->send_size, mtu);
8653                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8654                                 }
8655                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8656                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8657                                         struct sctp_data_chunk *dchkh;
8658
8659                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8660                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8661                                 }
8662                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8663                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8664                                         /* ok we will add this one */
8665
8666                                         /*
8667                                          * Add an AUTH chunk, if chunk
8668                                          * requires it, save the offset into
8669                                          * the chain for AUTH
8670                                          */
8671                                         if (data_auth_reqd) {
8672                                                 if (auth == NULL) {
8673                                                         outchain = sctp_add_auth_chunk(outchain,
8674                                                             &endoutchain,
8675                                                             &auth,
8676                                                             &auth_offset,
8677                                                             stcb,
8678                                                             SCTP_DATA);
8679                                                         auth_keyid = chk->auth_keyid;
8680                                                         override_ok = 0;
8681                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8682                                                 } else if (override_ok) {
8683                                                         /*
8684                                                          * use this data's
8685                                                          * keyid
8686                                                          */
8687                                                         auth_keyid = chk->auth_keyid;
8688                                                         override_ok = 0;
8689                                                 } else if (auth_keyid != chk->auth_keyid) {
8690                                                         /*
8691                                                          * different keyid,
8692                                                          * so done bundling
8693                                                          */
8694                                                         break;
8695                                                 }
8696                                         }
8697                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8698                                             chk->send_size, chk->copy_by_ref);
8699                                         if (outchain == NULL) {
8700                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8701                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8702                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8703                                                 }
8704                                                 *reason_code = 3;
8705                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8706                                                 return (ENOMEM);
8707                                         }
8708                                         /* upate our MTU size */
8709                                         /* Do clear IP_DF ? */
8710                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8711                                                 no_fragmentflg = 0;
8712                                         }
8713                                         /* unsigned subtraction of mtu */
8714                                         if (mtu > chk->send_size)
8715                                                 mtu -= chk->send_size;
8716                                         else
8717                                                 mtu = 0;
8718                                         /* unsigned subtraction of r_mtu */
8719                                         if (r_mtu > chk->send_size)
8720                                                 r_mtu -= chk->send_size;
8721                                         else
8722                                                 r_mtu = 0;
8723
8724                                         to_out += chk->send_size;
8725                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8726 #ifdef INVARIANTS
8727                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8728 #else
8729                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8730                                                     mx_mtu, to_out);
8731 #endif
8732                                         }
8733                                         chk->window_probe = 0;
8734                                         data_list[bundle_at++] = chk;
8735                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8736                                                 break;
8737                                         }
8738                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8739                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8740                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8741                                                 } else {
8742                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8743                                                 }
8744                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8745                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8746                                                         /*
8747                                                          * Count number of
8748                                                          * user msg's that
8749                                                          * were fragmented
8750                                                          * we do this by
8751                                                          * counting when we
8752                                                          * see a LAST
8753                                                          * fragment only.
8754                                                          */
8755                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8756                                         }
8757                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8758                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8759                                                         data_list[0]->window_probe = 1;
8760                                                         net->window_probe = 1;
8761                                                 }
8762                                                 break;
8763                                         }
8764                                 } else {
8765                                         /*
8766                                          * Must be sent in order of the
8767                                          * TSN's (on a network)
8768                                          */
8769                                         break;
8770                                 }
8771                         }       /* for (chunk gather loop for this net) */
8772                 }               /* if asoc.state OPEN */
8773 no_data_fill:
8774                 /* Is there something to send for this destination? */
8775                 if (outchain) {
8776                         /* We may need to start a control timer or two */
8777                         if (asconf) {
8778                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8779                                     stcb, net);
8780                                 /*
8781                                  * do NOT clear the asconf flag as it is
8782                                  * used to do appropriate source address
8783                                  * selection.
8784                                  */
8785                         }
8786                         if (cookie) {
8787                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8788                                 cookie = 0;
8789                         }
8790                         /* must start a send timer if data is being sent */
8791                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8792                                 /*
8793                                  * no timer running on this destination
8794                                  * restart it.
8795                                  */
8796                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8797                         }
8798                         if (bundle_at || hbflag) {
8799                                 /* For data/asconf and hb set time */
8800                                 if (*now_filled == 0) {
8801                                         (void)SCTP_GETTIME_TIMEVAL(now);
8802                                         *now_filled = 1;
8803                                 }
8804                                 net->last_sent_time = *now;
8805                         }
8806                         /* Now send it, if there is anything to send :> */
8807                         if ((error = sctp_lowlevel_chunk_output(inp,
8808                             stcb,
8809                             net,
8810                             (struct sockaddr *)&net->ro._l_addr,
8811                             outchain,
8812                             auth_offset,
8813                             auth,
8814                             auth_keyid,
8815                             no_fragmentflg,
8816                             bundle_at,
8817                             asconf,
8818                             inp->sctp_lport, stcb->rport,
8819                             htonl(stcb->asoc.peer_vtag),
8820                             net->port, NULL,
8821                             0, 0,
8822                             so_locked))) {
8823                                 /* error, we could not output */
8824                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8825                                 if (from_where == 0) {
8826                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8827                                 }
8828                                 if (error == ENOBUFS) {
8829                                         asoc->ifp_had_enobuf = 1;
8830                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8831                                 }
8832                                 if (error == EHOSTUNREACH) {
8833                                         /*
8834                                          * Destination went unreachable
8835                                          * during this send
8836                                          */
8837                                         sctp_move_chunks_from_net(stcb, net);
8838                                 }
8839                                 *reason_code = 6;
8840                                 /*-
8841                                  * I add this line to be paranoid. As far as
8842                                  * I can tell the continue, takes us back to
8843                                  * the top of the for, but just to make sure
8844                                  * I will reset these again here.
8845                                  */
8846                                 ctl_cnt = bundle_at = 0;
8847                                 continue;       /* This takes us back to the
8848                                                  * for() for the nets. */
8849                         } else {
8850                                 asoc->ifp_had_enobuf = 0;
8851                         }
8852                         endoutchain = NULL;
8853                         auth = NULL;
8854                         auth_offset = 0;
8855                         if (!no_out_cnt) {
8856                                 *num_out += (ctl_cnt + bundle_at);
8857                         }
8858                         if (bundle_at) {
8859                                 /* setup for a RTO measurement */
8860                                 tsns_sent = data_list[0]->rec.data.tsn;
8861                                 /* fill time if not already filled */
8862                                 if (*now_filled == 0) {
8863                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8864                                         *now_filled = 1;
8865                                         *now = asoc->time_last_sent;
8866                                 } else {
8867                                         asoc->time_last_sent = *now;
8868                                 }
8869                                 if (net->rto_needed) {
8870                                         data_list[0]->do_rtt = 1;
8871                                         net->rto_needed = 0;
8872                                 }
8873                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8874                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8875                         }
8876                         if (one_chunk) {
8877                                 break;
8878                         }
8879                 }
8880                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8881                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8882                 }
8883         }
8884         if (old_start_at == NULL) {
8885                 old_start_at = start_at;
8886                 start_at = TAILQ_FIRST(&asoc->nets);
8887                 if (old_start_at)
8888                         goto again_one_more_time;
8889         }
8890         /*
8891          * At the end there should be no NON timed chunks hanging on this
8892          * queue.
8893          */
8894         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8895                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8896         }
8897         if ((*num_out == 0) && (*reason_code == 0)) {
8898                 *reason_code = 4;
8899         } else {
8900                 *reason_code = 5;
8901         }
8902         sctp_clean_up_ctl(stcb, asoc, so_locked);
8903         return (0);
8904 }
8905
8906 void
8907 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8908 {
8909         /*-
8910          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8911          * the control chunk queue.
8912          */
8913         struct sctp_chunkhdr *hdr;
8914         struct sctp_tmit_chunk *chk;
8915         struct mbuf *mat, *last_mbuf;
8916         uint32_t chunk_length;
8917         uint16_t padding_length;
8918
8919         SCTP_TCB_LOCK_ASSERT(stcb);
8920         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8921         if (op_err == NULL) {
8922                 return;
8923         }
8924         last_mbuf = NULL;
8925         chunk_length = 0;
8926         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8927                 chunk_length += SCTP_BUF_LEN(mat);
8928                 if (SCTP_BUF_NEXT(mat) == NULL) {
8929                         last_mbuf = mat;
8930                 }
8931         }
8932         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8933                 sctp_m_freem(op_err);
8934                 return;
8935         }
8936         padding_length = chunk_length % 4;
8937         if (padding_length != 0) {
8938                 padding_length = 4 - padding_length;
8939         }
8940         if (padding_length != 0) {
8941                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8942                         sctp_m_freem(op_err);
8943                         return;
8944                 }
8945         }
8946         sctp_alloc_a_chunk(stcb, chk);
8947         if (chk == NULL) {
8948                 /* no memory */
8949                 sctp_m_freem(op_err);
8950                 return;
8951         }
8952         chk->copy_by_ref = 0;
8953         chk->send_size = (uint16_t)chunk_length;
8954         chk->sent = SCTP_DATAGRAM_UNSENT;
8955         chk->snd_count = 0;
8956         chk->asoc = &stcb->asoc;
8957         chk->data = op_err;
8958         chk->whoTo = NULL;
8959         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8960         chk->rec.chunk_id.can_take_data = 0;
8961         hdr = mtod(op_err, struct sctp_chunkhdr *);
8962         hdr->chunk_type = SCTP_OPERATION_ERROR;
8963         hdr->chunk_flags = 0;
8964         hdr->chunk_length = htons(chk->send_size);
8965         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8966         chk->asoc->ctrl_queue_cnt++;
8967 }
8968
8969 int
8970 sctp_send_cookie_echo(struct mbuf *m,
8971     int offset,
8972     struct sctp_tcb *stcb,
8973     struct sctp_nets *net)
8974 {
8975         /*-
8976          * pull out the cookie and put it at the front of the control chunk
8977          * queue.
8978          */
8979         int at;
8980         struct mbuf *cookie;
8981         struct sctp_paramhdr param, *phdr;
8982         struct sctp_chunkhdr *hdr;
8983         struct sctp_tmit_chunk *chk;
8984         uint16_t ptype, plen;
8985
8986         SCTP_TCB_LOCK_ASSERT(stcb);
8987         /* First find the cookie in the param area */
8988         cookie = NULL;
8989         at = offset + sizeof(struct sctp_init_chunk);
8990         for (;;) {
8991                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
8992                 if (phdr == NULL) {
8993                         return (-3);
8994                 }
8995                 ptype = ntohs(phdr->param_type);
8996                 plen = ntohs(phdr->param_length);
8997                 if (ptype == SCTP_STATE_COOKIE) {
8998                         int pad;
8999
9000                         /* found the cookie */
9001                         if ((pad = (plen % 4))) {
9002                                 plen += 4 - pad;
9003                         }
9004                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9005                         if (cookie == NULL) {
9006                                 /* No memory */
9007                                 return (-2);
9008                         }
9009 #ifdef SCTP_MBUF_LOGGING
9010                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9011                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9012                         }
9013 #endif
9014                         break;
9015                 }
9016                 at += SCTP_SIZE32(plen);
9017         }
9018         /* ok, we got the cookie lets change it into a cookie echo chunk */
9019         /* first the change from param to cookie */
9020         hdr = mtod(cookie, struct sctp_chunkhdr *);
9021         hdr->chunk_type = SCTP_COOKIE_ECHO;
9022         hdr->chunk_flags = 0;
9023         /* get the chunk stuff now and place it in the FRONT of the queue */
9024         sctp_alloc_a_chunk(stcb, chk);
9025         if (chk == NULL) {
9026                 /* no memory */
9027                 sctp_m_freem(cookie);
9028                 return (-5);
9029         }
9030         chk->copy_by_ref = 0;
9031         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9032         chk->rec.chunk_id.can_take_data = 0;
9033         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9034         chk->send_size = plen;
9035         chk->sent = SCTP_DATAGRAM_UNSENT;
9036         chk->snd_count = 0;
9037         chk->asoc = &stcb->asoc;
9038         chk->data = cookie;
9039         chk->whoTo = net;
9040         atomic_add_int(&chk->whoTo->ref_count, 1);
9041         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9042         chk->asoc->ctrl_queue_cnt++;
9043         return (0);
9044 }
9045
9046 void
9047 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9048     struct mbuf *m,
9049     int offset,
9050     int chk_length,
9051     struct sctp_nets *net)
9052 {
9053         /*
9054          * take a HB request and make it into a HB ack and send it.
9055          */
9056         struct mbuf *outchain;
9057         struct sctp_chunkhdr *chdr;
9058         struct sctp_tmit_chunk *chk;
9059
9060
9061         if (net == NULL)
9062                 /* must have a net pointer */
9063                 return;
9064
9065         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9066         if (outchain == NULL) {
9067                 /* gak out of memory */
9068                 return;
9069         }
9070 #ifdef SCTP_MBUF_LOGGING
9071         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9072                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9073         }
9074 #endif
9075         chdr = mtod(outchain, struct sctp_chunkhdr *);
9076         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9077         chdr->chunk_flags = 0;
9078         if (chk_length % 4) {
9079                 /* need pad */
9080                 uint32_t cpthis = 0;
9081                 int padlen;
9082
9083                 padlen = 4 - (chk_length % 4);
9084                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9085         }
9086         sctp_alloc_a_chunk(stcb, chk);
9087         if (chk == NULL) {
9088                 /* no memory */
9089                 sctp_m_freem(outchain);
9090                 return;
9091         }
9092         chk->copy_by_ref = 0;
9093         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9094         chk->rec.chunk_id.can_take_data = 1;
9095         chk->flags = 0;
9096         chk->send_size = chk_length;
9097         chk->sent = SCTP_DATAGRAM_UNSENT;
9098         chk->snd_count = 0;
9099         chk->asoc = &stcb->asoc;
9100         chk->data = outchain;
9101         chk->whoTo = net;
9102         atomic_add_int(&chk->whoTo->ref_count, 1);
9103         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9104         chk->asoc->ctrl_queue_cnt++;
9105 }
9106
9107 void
9108 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9109 {
9110         /* formulate and queue a cookie-ack back to sender */
9111         struct mbuf *cookie_ack;
9112         struct sctp_chunkhdr *hdr;
9113         struct sctp_tmit_chunk *chk;
9114
9115         SCTP_TCB_LOCK_ASSERT(stcb);
9116
9117         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9118         if (cookie_ack == NULL) {
9119                 /* no mbuf's */
9120                 return;
9121         }
9122         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9123         sctp_alloc_a_chunk(stcb, chk);
9124         if (chk == NULL) {
9125                 /* no memory */
9126                 sctp_m_freem(cookie_ack);
9127                 return;
9128         }
9129         chk->copy_by_ref = 0;
9130         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9131         chk->rec.chunk_id.can_take_data = 1;
9132         chk->flags = 0;
9133         chk->send_size = sizeof(struct sctp_chunkhdr);
9134         chk->sent = SCTP_DATAGRAM_UNSENT;
9135         chk->snd_count = 0;
9136         chk->asoc = &stcb->asoc;
9137         chk->data = cookie_ack;
9138         if (chk->asoc->last_control_chunk_from != NULL) {
9139                 chk->whoTo = chk->asoc->last_control_chunk_from;
9140                 atomic_add_int(&chk->whoTo->ref_count, 1);
9141         } else {
9142                 chk->whoTo = NULL;
9143         }
9144         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9145         hdr->chunk_type = SCTP_COOKIE_ACK;
9146         hdr->chunk_flags = 0;
9147         hdr->chunk_length = htons(chk->send_size);
9148         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9149         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9150         chk->asoc->ctrl_queue_cnt++;
9151         return;
9152 }
9153
9154
9155 void
9156 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9157 {
9158         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9159         struct mbuf *m_shutdown_ack;
9160         struct sctp_shutdown_ack_chunk *ack_cp;
9161         struct sctp_tmit_chunk *chk;
9162
9163         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9164         if (m_shutdown_ack == NULL) {
9165                 /* no mbuf's */
9166                 return;
9167         }
9168         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9169         sctp_alloc_a_chunk(stcb, chk);
9170         if (chk == NULL) {
9171                 /* no memory */
9172                 sctp_m_freem(m_shutdown_ack);
9173                 return;
9174         }
9175         chk->copy_by_ref = 0;
9176         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9177         chk->rec.chunk_id.can_take_data = 1;
9178         chk->flags = 0;
9179         chk->send_size = sizeof(struct sctp_chunkhdr);
9180         chk->sent = SCTP_DATAGRAM_UNSENT;
9181         chk->snd_count = 0;
9182         chk->flags = 0;
9183         chk->asoc = &stcb->asoc;
9184         chk->data = m_shutdown_ack;
9185         chk->whoTo = net;
9186         if (chk->whoTo) {
9187                 atomic_add_int(&chk->whoTo->ref_count, 1);
9188         }
9189         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9190         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9191         ack_cp->ch.chunk_flags = 0;
9192         ack_cp->ch.chunk_length = htons(chk->send_size);
9193         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9194         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9195         chk->asoc->ctrl_queue_cnt++;
9196         return;
9197 }
9198
9199 void
9200 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9201 {
9202         /* formulate and queue a SHUTDOWN to the sender */
9203         struct mbuf *m_shutdown;
9204         struct sctp_shutdown_chunk *shutdown_cp;
9205         struct sctp_tmit_chunk *chk;
9206
9207         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9208                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9209                         /* We already have a SHUTDOWN queued. Reuse it. */
9210                         if (chk->whoTo) {
9211                                 sctp_free_remote_addr(chk->whoTo);
9212                                 chk->whoTo = NULL;
9213                         }
9214                         break;
9215                 }
9216         }
9217         if (chk == NULL) {
9218                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9219                 if (m_shutdown == NULL) {
9220                         /* no mbuf's */
9221                         return;
9222                 }
9223                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9224                 sctp_alloc_a_chunk(stcb, chk);
9225                 if (chk == NULL) {
9226                         /* no memory */
9227                         sctp_m_freem(m_shutdown);
9228                         return;
9229                 }
9230                 chk->copy_by_ref = 0;
9231                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9232                 chk->rec.chunk_id.can_take_data = 1;
9233                 chk->flags = 0;
9234                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
9235                 chk->sent = SCTP_DATAGRAM_UNSENT;
9236                 chk->snd_count = 0;
9237                 chk->flags = 0;
9238                 chk->asoc = &stcb->asoc;
9239                 chk->data = m_shutdown;
9240                 chk->whoTo = net;
9241                 if (chk->whoTo) {
9242                         atomic_add_int(&chk->whoTo->ref_count, 1);
9243                 }
9244                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9245                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9246                 shutdown_cp->ch.chunk_flags = 0;
9247                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
9248                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9249                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9250                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9251                 chk->asoc->ctrl_queue_cnt++;
9252         } else {
9253                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9254                 chk->whoTo = net;
9255                 if (chk->whoTo) {
9256                         atomic_add_int(&chk->whoTo->ref_count, 1);
9257                 }
9258                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9259                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9260                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9261         }
9262         return;
9263 }
9264
9265 void
9266 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9267 {
9268         /*
9269          * formulate and queue an ASCONF to the peer. ASCONF parameters
9270          * should be queued on the assoc queue.
9271          */
9272         struct sctp_tmit_chunk *chk;
9273         struct mbuf *m_asconf;
9274         int len;
9275
9276         SCTP_TCB_LOCK_ASSERT(stcb);
9277
9278         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9279             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9280                 /* can't send a new one if there is one in flight already */
9281                 return;
9282         }
9283         /* compose an ASCONF chunk, maximum length is PMTU */
9284         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9285         if (m_asconf == NULL) {
9286                 return;
9287         }
9288         sctp_alloc_a_chunk(stcb, chk);
9289         if (chk == NULL) {
9290                 /* no memory */
9291                 sctp_m_freem(m_asconf);
9292                 return;
9293         }
9294         chk->copy_by_ref = 0;
9295         chk->rec.chunk_id.id = SCTP_ASCONF;
9296         chk->rec.chunk_id.can_take_data = 0;
9297         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9298         chk->data = m_asconf;
9299         chk->send_size = len;
9300         chk->sent = SCTP_DATAGRAM_UNSENT;
9301         chk->snd_count = 0;
9302         chk->asoc = &stcb->asoc;
9303         chk->whoTo = net;
9304         if (chk->whoTo) {
9305                 atomic_add_int(&chk->whoTo->ref_count, 1);
9306         }
9307         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9308         chk->asoc->ctrl_queue_cnt++;
9309         return;
9310 }
9311
9312 void
9313 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9314 {
9315         /*
9316          * formulate and queue a asconf-ack back to sender. the asconf-ack
9317          * must be stored in the tcb.
9318          */
9319         struct sctp_tmit_chunk *chk;
9320         struct sctp_asconf_ack *ack, *latest_ack;
9321         struct mbuf *m_ack;
9322         struct sctp_nets *net = NULL;
9323
9324         SCTP_TCB_LOCK_ASSERT(stcb);
9325         /* Get the latest ASCONF-ACK */
9326         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9327         if (latest_ack == NULL) {
9328                 return;
9329         }
9330         if (latest_ack->last_sent_to != NULL &&
9331             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9332                 /* we're doing a retransmission */
9333                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9334                 if (net == NULL) {
9335                         /* no alternate */
9336                         if (stcb->asoc.last_control_chunk_from == NULL) {
9337                                 if (stcb->asoc.alternate) {
9338                                         net = stcb->asoc.alternate;
9339                                 } else {
9340                                         net = stcb->asoc.primary_destination;
9341                                 }
9342                         } else {
9343                                 net = stcb->asoc.last_control_chunk_from;
9344                         }
9345                 }
9346         } else {
9347                 /* normal case */
9348                 if (stcb->asoc.last_control_chunk_from == NULL) {
9349                         if (stcb->asoc.alternate) {
9350                                 net = stcb->asoc.alternate;
9351                         } else {
9352                                 net = stcb->asoc.primary_destination;
9353                         }
9354                 } else {
9355                         net = stcb->asoc.last_control_chunk_from;
9356                 }
9357         }
9358         latest_ack->last_sent_to = net;
9359
9360         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9361                 if (ack->data == NULL) {
9362                         continue;
9363                 }
9364                 /* copy the asconf_ack */
9365                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9366                 if (m_ack == NULL) {
9367                         /* couldn't copy it */
9368                         return;
9369                 }
9370 #ifdef SCTP_MBUF_LOGGING
9371                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9372                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9373                 }
9374 #endif
9375
9376                 sctp_alloc_a_chunk(stcb, chk);
9377                 if (chk == NULL) {
9378                         /* no memory */
9379                         if (m_ack)
9380                                 sctp_m_freem(m_ack);
9381                         return;
9382                 }
9383                 chk->copy_by_ref = 0;
9384                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9385                 chk->rec.chunk_id.can_take_data = 1;
9386                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9387                 chk->whoTo = net;
9388                 if (chk->whoTo) {
9389                         atomic_add_int(&chk->whoTo->ref_count, 1);
9390                 }
9391                 chk->data = m_ack;
9392                 chk->send_size = ack->len;
9393                 chk->sent = SCTP_DATAGRAM_UNSENT;
9394                 chk->snd_count = 0;
9395                 chk->asoc = &stcb->asoc;
9396
9397                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9398                 chk->asoc->ctrl_queue_cnt++;
9399         }
9400         return;
9401 }
9402
9403
9404 static int
9405 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9406     struct sctp_tcb *stcb,
9407     struct sctp_association *asoc,
9408     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9409 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9410     SCTP_UNUSED
9411 #endif
9412 )
9413 {
9414         /*-
9415          * send out one MTU of retransmission. If fast_retransmit is
9416          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9417          * rwnd. For a Cookie or Asconf in the control chunk queue we
9418          * retransmit them by themselves.
9419          *
9420          * For data chunks we will pick out the lowest TSN's in the sent_queue
9421          * marked for resend and bundle them all together (up to a MTU of
9422          * destination). The address to send to should have been
9423          * selected/changed where the retransmission was marked (i.e. in FR
9424          * or t3-timeout routines).
9425          */
9426         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9427         struct sctp_tmit_chunk *chk, *fwd;
9428         struct mbuf *m, *endofchain;
9429         struct sctp_nets *net = NULL;
9430         uint32_t tsns_sent = 0;
9431         int no_fragmentflg, bundle_at, cnt_thru;
9432         unsigned int mtu;
9433         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9434         struct sctp_auth_chunk *auth = NULL;
9435         uint32_t auth_offset = 0;
9436         uint16_t auth_keyid;
9437         int override_ok = 1;
9438         int data_auth_reqd = 0;
9439         uint32_t dmtu = 0;
9440
9441         SCTP_TCB_LOCK_ASSERT(stcb);
9442         tmr_started = ctl_cnt = bundle_at = error = 0;
9443         no_fragmentflg = 1;
9444         fwd_tsn = 0;
9445         *cnt_out = 0;
9446         fwd = NULL;
9447         endofchain = m = NULL;
9448         auth_keyid = stcb->asoc.authinfo.active_keyid;
9449 #ifdef SCTP_AUDITING_ENABLED
9450         sctp_audit_log(0xC3, 1);
9451 #endif
9452         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9453             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9454                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9455                     asoc->sent_queue_retran_cnt);
9456                 asoc->sent_queue_cnt = 0;
9457                 asoc->sent_queue_cnt_removeable = 0;
9458                 /* send back 0/0 so we enter normal transmission */
9459                 *cnt_out = 0;
9460                 return (0);
9461         }
9462         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9463                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9464                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9465                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9466                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9467                                 continue;
9468                         }
9469                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9470                                 if (chk != asoc->str_reset) {
9471                                         /*
9472                                          * not eligible for retran if its
9473                                          * not ours
9474                                          */
9475                                         continue;
9476                                 }
9477                         }
9478                         ctl_cnt++;
9479                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9480                                 fwd_tsn = 1;
9481                         }
9482                         /*
9483                          * Add an AUTH chunk, if chunk requires it save the
9484                          * offset into the chain for AUTH
9485                          */
9486                         if ((auth == NULL) &&
9487                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9488                             stcb->asoc.peer_auth_chunks))) {
9489                                 m = sctp_add_auth_chunk(m, &endofchain,
9490                                     &auth, &auth_offset,
9491                                     stcb,
9492                                     chk->rec.chunk_id.id);
9493                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9494                         }
9495                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9496                         break;
9497                 }
9498         }
9499         one_chunk = 0;
9500         cnt_thru = 0;
9501         /* do we have control chunks to retransmit? */
9502         if (m != NULL) {
9503                 /* Start a timer no matter if we succeed or fail */
9504                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9505                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9506                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9507                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9508                 chk->snd_count++;       /* update our count */
9509                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9510                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9511                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9512                     no_fragmentflg, 0, 0,
9513                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9514                     chk->whoTo->port, NULL,
9515                     0, 0,
9516                     so_locked))) {
9517                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9518                         if (error == ENOBUFS) {
9519                                 asoc->ifp_had_enobuf = 1;
9520                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9521                         }
9522                         return (error);
9523                 } else {
9524                         asoc->ifp_had_enobuf = 0;
9525                 }
9526                 endofchain = NULL;
9527                 auth = NULL;
9528                 auth_offset = 0;
9529                 /*
9530                  * We don't want to mark the net->sent time here since this
9531                  * we use this for HB and retrans cannot measure RTT
9532                  */
9533                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9534                 *cnt_out += 1;
9535                 chk->sent = SCTP_DATAGRAM_SENT;
9536                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9537                 if (fwd_tsn == 0) {
9538                         return (0);
9539                 } else {
9540                         /* Clean up the fwd-tsn list */
9541                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9542                         return (0);
9543                 }
9544         }
9545         /*
9546          * Ok, it is just data retransmission we need to do or that and a
9547          * fwd-tsn with it all.
9548          */
9549         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9550                 return (SCTP_RETRAN_DONE);
9551         }
9552         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9553             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9554                 /* not yet open, resend the cookie and that is it */
9555                 return (1);
9556         }
9557 #ifdef SCTP_AUDITING_ENABLED
9558         sctp_auditing(20, inp, stcb, NULL);
9559 #endif
9560         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9561         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9562                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9563                         /* No, not sent to this net or not ready for rtx */
9564                         continue;
9565                 }
9566                 if (chk->data == NULL) {
9567                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9568                             chk->rec.data.tsn, chk->snd_count, chk->sent);
9569                         continue;
9570                 }
9571                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9572                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9573                         struct mbuf *op_err;
9574                         char msg[SCTP_DIAG_INFO_LEN];
9575
9576                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9577                             chk->rec.data.tsn, chk->snd_count);
9578                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9579                             msg);
9580                         atomic_add_int(&stcb->asoc.refcnt, 1);
9581                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9582                             so_locked);
9583                         SCTP_TCB_LOCK(stcb);
9584                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9585                         return (SCTP_RETRAN_EXIT);
9586                 }
9587                 /* pick up the net */
9588                 net = chk->whoTo;
9589                 switch (net->ro._l_addr.sa.sa_family) {
9590 #ifdef INET
9591                 case AF_INET:
9592                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9593                         break;
9594 #endif
9595 #ifdef INET6
9596                 case AF_INET6:
9597                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9598                         break;
9599 #endif
9600                 default:
9601                         /* TSNH */
9602                         mtu = net->mtu;
9603                         break;
9604                 }
9605
9606                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9607                         /* No room in peers rwnd */
9608                         uint32_t tsn;
9609
9610                         tsn = asoc->last_acked_seq + 1;
9611                         if (tsn == chk->rec.data.tsn) {
9612                                 /*
9613                                  * we make a special exception for this
9614                                  * case. The peer has no rwnd but is missing
9615                                  * the lowest chunk.. which is probably what
9616                                  * is holding up the rwnd.
9617                                  */
9618                                 goto one_chunk_around;
9619                         }
9620                         return (1);
9621                 }
9622 one_chunk_around:
9623                 if (asoc->peers_rwnd < mtu) {
9624                         one_chunk = 1;
9625                         if ((asoc->peers_rwnd == 0) &&
9626                             (asoc->total_flight == 0)) {
9627                                 chk->window_probe = 1;
9628                                 chk->whoTo->window_probe = 1;
9629                         }
9630                 }
9631 #ifdef SCTP_AUDITING_ENABLED
9632                 sctp_audit_log(0xC3, 2);
9633 #endif
9634                 bundle_at = 0;
9635                 m = NULL;
9636                 net->fast_retran_ip = 0;
9637                 if (chk->rec.data.doing_fast_retransmit == 0) {
9638                         /*
9639                          * if no FR in progress skip destination that have
9640                          * flight_size > cwnd.
9641                          */
9642                         if (net->flight_size >= net->cwnd) {
9643                                 continue;
9644                         }
9645                 } else {
9646                         /*
9647                          * Mark the destination net to have FR recovery
9648                          * limits put on it.
9649                          */
9650                         *fr_done = 1;
9651                         net->fast_retran_ip = 1;
9652                 }
9653
9654                 /*
9655                  * if no AUTH is yet included and this chunk requires it,
9656                  * make sure to account for it.  We don't apply the size
9657                  * until the AUTH chunk is actually added below in case
9658                  * there is no room for this chunk.
9659                  */
9660                 if (data_auth_reqd && (auth == NULL)) {
9661                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9662                 } else
9663                         dmtu = 0;
9664
9665                 if ((chk->send_size <= (mtu - dmtu)) ||
9666                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9667                         /* ok we will add this one */
9668                         if (data_auth_reqd) {
9669                                 if (auth == NULL) {
9670                                         m = sctp_add_auth_chunk(m,
9671                                             &endofchain,
9672                                             &auth,
9673                                             &auth_offset,
9674                                             stcb,
9675                                             SCTP_DATA);
9676                                         auth_keyid = chk->auth_keyid;
9677                                         override_ok = 0;
9678                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9679                                 } else if (override_ok) {
9680                                         auth_keyid = chk->auth_keyid;
9681                                         override_ok = 0;
9682                                 } else if (chk->auth_keyid != auth_keyid) {
9683                                         /* different keyid, so done bundling */
9684                                         break;
9685                                 }
9686                         }
9687                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9688                         if (m == NULL) {
9689                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9690                                 return (ENOMEM);
9691                         }
9692                         /* Do clear IP_DF ? */
9693                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9694                                 no_fragmentflg = 0;
9695                         }
9696                         /* upate our MTU size */
9697                         if (mtu > (chk->send_size + dmtu))
9698                                 mtu -= (chk->send_size + dmtu);
9699                         else
9700                                 mtu = 0;
9701                         data_list[bundle_at++] = chk;
9702                         if (one_chunk && (asoc->total_flight <= 0)) {
9703                                 SCTP_STAT_INCR(sctps_windowprobed);
9704                         }
9705                 }
9706                 if (one_chunk == 0) {
9707                         /*
9708                          * now are there anymore forward from chk to pick
9709                          * up?
9710                          */
9711                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9712                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9713                                         /* Nope, not for retran */
9714                                         continue;
9715                                 }
9716                                 if (fwd->whoTo != net) {
9717                                         /* Nope, not the net in question */
9718                                         continue;
9719                                 }
9720                                 if (data_auth_reqd && (auth == NULL)) {
9721                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9722                                 } else
9723                                         dmtu = 0;
9724                                 if (fwd->send_size <= (mtu - dmtu)) {
9725                                         if (data_auth_reqd) {
9726                                                 if (auth == NULL) {
9727                                                         m = sctp_add_auth_chunk(m,
9728                                                             &endofchain,
9729                                                             &auth,
9730                                                             &auth_offset,
9731                                                             stcb,
9732                                                             SCTP_DATA);
9733                                                         auth_keyid = fwd->auth_keyid;
9734                                                         override_ok = 0;
9735                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9736                                                 } else if (override_ok) {
9737                                                         auth_keyid = fwd->auth_keyid;
9738                                                         override_ok = 0;
9739                                                 } else if (fwd->auth_keyid != auth_keyid) {
9740                                                         /*
9741                                                          * different keyid,
9742                                                          * so done bundling
9743                                                          */
9744                                                         break;
9745                                                 }
9746                                         }
9747                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9748                                         if (m == NULL) {
9749                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9750                                                 return (ENOMEM);
9751                                         }
9752                                         /* Do clear IP_DF ? */
9753                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9754                                                 no_fragmentflg = 0;
9755                                         }
9756                                         /* upate our MTU size */
9757                                         if (mtu > (fwd->send_size + dmtu))
9758                                                 mtu -= (fwd->send_size + dmtu);
9759                                         else
9760                                                 mtu = 0;
9761                                         data_list[bundle_at++] = fwd;
9762                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9763                                                 break;
9764                                         }
9765                                 } else {
9766                                         /* can't fit so we are done */
9767                                         break;
9768                                 }
9769                         }
9770                 }
9771                 /* Is there something to send for this destination? */
9772                 if (m) {
9773                         /*
9774                          * No matter if we fail/or succeed we should start a
9775                          * timer. A failure is like a lost IP packet :-)
9776                          */
9777                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9778                                 /*
9779                                  * no timer running on this destination
9780                                  * restart it.
9781                                  */
9782                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9783                                 tmr_started = 1;
9784                         }
9785                         /* Now lets send it, if there is anything to send :> */
9786                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9787                             (struct sockaddr *)&net->ro._l_addr, m,
9788                             auth_offset, auth, auth_keyid,
9789                             no_fragmentflg, 0, 0,
9790                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9791                             net->port, NULL,
9792                             0, 0,
9793                             so_locked))) {
9794                                 /* error, we could not output */
9795                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9796                                 if (error == ENOBUFS) {
9797                                         asoc->ifp_had_enobuf = 1;
9798                                         SCTP_STAT_INCR(sctps_lowlevelerr);
9799                                 }
9800                                 return (error);
9801                         } else {
9802                                 asoc->ifp_had_enobuf = 0;
9803                         }
9804                         endofchain = NULL;
9805                         auth = NULL;
9806                         auth_offset = 0;
9807                         /* For HB's */
9808                         /*
9809                          * We don't want to mark the net->sent time here
9810                          * since this we use this for HB and retrans cannot
9811                          * measure RTT
9812                          */
9813                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9814
9815                         /* For auto-close */
9816                         cnt_thru++;
9817                         if (*now_filled == 0) {
9818                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9819                                 *now = asoc->time_last_sent;
9820                                 *now_filled = 1;
9821                         } else {
9822                                 asoc->time_last_sent = *now;
9823                         }
9824                         *cnt_out += bundle_at;
9825 #ifdef SCTP_AUDITING_ENABLED
9826                         sctp_audit_log(0xC4, bundle_at);
9827 #endif
9828                         if (bundle_at) {
9829                                 tsns_sent = data_list[0]->rec.data.tsn;
9830                         }
9831                         for (i = 0; i < bundle_at; i++) {
9832                                 SCTP_STAT_INCR(sctps_sendretransdata);
9833                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9834                                 /*
9835                                  * When we have a revoked data, and we
9836                                  * retransmit it, then we clear the revoked
9837                                  * flag since this flag dictates if we
9838                                  * subtracted from the fs
9839                                  */
9840                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9841                                         /* Deflate the cwnd */
9842                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9843                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9844                                 }
9845                                 data_list[i]->snd_count++;
9846                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9847                                 /* record the time */
9848                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9849                                 if (data_list[i]->book_size_scale) {
9850                                         /*
9851                                          * need to double the book size on
9852                                          * this one
9853                                          */
9854                                         data_list[i]->book_size_scale = 0;
9855                                         /*
9856                                          * Since we double the booksize, we
9857                                          * must also double the output queue
9858                                          * size, since this get shrunk when
9859                                          * we free by this amount.
9860                                          */
9861                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9862                                         data_list[i]->book_size *= 2;
9863
9864
9865                                 } else {
9866                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9867                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9868                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9869                                         }
9870                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9871                                             (uint32_t)(data_list[i]->send_size +
9872                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9873                                 }
9874                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9875                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9876                                             data_list[i]->whoTo->flight_size,
9877                                             data_list[i]->book_size,
9878                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
9879                                             data_list[i]->rec.data.tsn);
9880                                 }
9881                                 sctp_flight_size_increase(data_list[i]);
9882                                 sctp_total_flight_increase(stcb, data_list[i]);
9883                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9884                                         /* SWS sender side engages */
9885                                         asoc->peers_rwnd = 0;
9886                                 }
9887                                 if ((i == 0) &&
9888                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9889                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9890                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9891                                             (tmr_started == 0)) {
9892                                                 /*-
9893                                                  * ok we just fast-retrans'd
9894                                                  * the lowest TSN, i.e the
9895                                                  * first on the list. In
9896                                                  * this case we want to give
9897                                                  * some more time to get a
9898                                                  * SACK back without a
9899                                                  * t3-expiring.
9900                                                  */
9901                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9902                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9903                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9904                                         }
9905                                 }
9906                         }
9907                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9908                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9909                         }
9910 #ifdef SCTP_AUDITING_ENABLED
9911                         sctp_auditing(21, inp, stcb, NULL);
9912 #endif
9913                 } else {
9914                         /* None will fit */
9915                         return (1);
9916                 }
9917                 if (asoc->sent_queue_retran_cnt <= 0) {
9918                         /* all done we have no more to retran */
9919                         asoc->sent_queue_retran_cnt = 0;
9920                         break;
9921                 }
9922                 if (one_chunk) {
9923                         /* No more room in rwnd */
9924                         return (1);
9925                 }
9926                 /* stop the for loop here. we sent out a packet */
9927                 break;
9928         }
9929         return (0);
9930 }
9931
9932 static void
9933 sctp_timer_validation(struct sctp_inpcb *inp,
9934     struct sctp_tcb *stcb,
9935     struct sctp_association *asoc)
9936 {
9937         struct sctp_nets *net;
9938
9939         /* Validate that a timer is running somewhere */
9940         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9941                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9942                         /* Here is a timer */
9943                         return;
9944                 }
9945         }
9946         SCTP_TCB_LOCK_ASSERT(stcb);
9947         /* Gak, we did not have a timer somewhere */
9948         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9949         if (asoc->alternate) {
9950                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9951         } else {
9952                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9953         }
9954         return;
9955 }
9956
9957 void
9958 sctp_chunk_output(struct sctp_inpcb *inp,
9959     struct sctp_tcb *stcb,
9960     int from_where,
9961     int so_locked
9962 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9963     SCTP_UNUSED
9964 #endif
9965 )
9966 {
9967         /*-
9968          * Ok this is the generic chunk service queue. we must do the
9969          * following:
9970          * - See if there are retransmits pending, if so we must
9971          *   do these first.
9972          * - Service the stream queue that is next, moving any
9973          *   message (note I must get a complete message i.e.
9974          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9975          *   TSN's
9976          * - Check to see if the cwnd/rwnd allows any output, if so we
9977          *   go ahead and fomulate and send the low level chunks. Making sure
9978          *   to combine any control in the control chunk queue also.
9979          */
9980         struct sctp_association *asoc;
9981         struct sctp_nets *net;
9982         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
9983         unsigned int burst_cnt = 0;
9984         struct timeval now;
9985         int now_filled = 0;
9986         int nagle_on;
9987         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9988         int un_sent = 0;
9989         int fr_done;
9990         unsigned int tot_frs = 0;
9991
9992         asoc = &stcb->asoc;
9993 do_it_again:
9994         /* The Nagle algorithm is only applied when handling a send call. */
9995         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9996                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9997                         nagle_on = 0;
9998                 } else {
9999                         nagle_on = 1;
10000                 }
10001         } else {
10002                 nagle_on = 0;
10003         }
10004         SCTP_TCB_LOCK_ASSERT(stcb);
10005
10006         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10007
10008         if ((un_sent <= 0) &&
10009             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10010             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10011             (asoc->sent_queue_retran_cnt == 0) &&
10012             (asoc->trigger_reset == 0)) {
10013                 /* Nothing to do unless there is something to be sent left */
10014                 return;
10015         }
10016         /*
10017          * Do we have something to send, data or control AND a sack timer
10018          * running, if so piggy-back the sack.
10019          */
10020         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10021                 sctp_send_sack(stcb, so_locked);
10022                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10023         }
10024         while (asoc->sent_queue_retran_cnt) {
10025                 /*-
10026                  * Ok, it is retransmission time only, we send out only ONE
10027                  * packet with a single call off to the retran code.
10028                  */
10029                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10030                         /*-
10031                          * Special hook for handling cookiess discarded
10032                          * by peer that carried data. Send cookie-ack only
10033                          * and then the next call with get the retran's.
10034                          */
10035                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10036                             from_where,
10037                             &now, &now_filled, frag_point, so_locked);
10038                         return;
10039                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10040                         /* if its not from a HB then do it */
10041                         fr_done = 0;
10042                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10043                         if (fr_done) {
10044                                 tot_frs++;
10045                         }
10046                 } else {
10047                         /*
10048                          * its from any other place, we don't allow retran
10049                          * output (only control)
10050                          */
10051                         ret = 1;
10052                 }
10053                 if (ret > 0) {
10054                         /* Can't send anymore */
10055                         /*-
10056                          * now lets push out control by calling med-level
10057                          * output once. this assures that we WILL send HB's
10058                          * if queued too.
10059                          */
10060                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10061                             from_where,
10062                             &now, &now_filled, frag_point, so_locked);
10063 #ifdef SCTP_AUDITING_ENABLED
10064                         sctp_auditing(8, inp, stcb, NULL);
10065 #endif
10066                         sctp_timer_validation(inp, stcb, asoc);
10067                         return;
10068                 }
10069                 if (ret < 0) {
10070                         /*-
10071                          * The count was off.. retran is not happening so do
10072                          * the normal retransmission.
10073                          */
10074 #ifdef SCTP_AUDITING_ENABLED
10075                         sctp_auditing(9, inp, stcb, NULL);
10076 #endif
10077                         if (ret == SCTP_RETRAN_EXIT) {
10078                                 return;
10079                         }
10080                         break;
10081                 }
10082                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10083                         /* Only one transmission allowed out of a timeout */
10084 #ifdef SCTP_AUDITING_ENABLED
10085                         sctp_auditing(10, inp, stcb, NULL);
10086 #endif
10087                         /* Push out any control */
10088                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10089                             &now, &now_filled, frag_point, so_locked);
10090                         return;
10091                 }
10092                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10093                         /* Hit FR burst limit */
10094                         return;
10095                 }
10096                 if ((num_out == 0) && (ret == 0)) {
10097                         /* No more retrans to send */
10098                         break;
10099                 }
10100         }
10101 #ifdef SCTP_AUDITING_ENABLED
10102         sctp_auditing(12, inp, stcb, NULL);
10103 #endif
10104         /* Check for bad destinations, if they exist move chunks around. */
10105         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10106                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10107                         /*-
10108                          * if possible move things off of this address we
10109                          * still may send below due to the dormant state but
10110                          * we try to find an alternate address to send to
10111                          * and if we have one we move all queued data on the
10112                          * out wheel to this alternate address.
10113                          */
10114                         if (net->ref_count > 1)
10115                                 sctp_move_chunks_from_net(stcb, net);
10116                 } else {
10117                         /*-
10118                          * if ((asoc->sat_network) || (net->addr_is_local))
10119                          * { burst_limit = asoc->max_burst *
10120                          * SCTP_SAT_NETWORK_BURST_INCR; }
10121                          */
10122                         if (asoc->max_burst > 0) {
10123                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10124                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10125                                                 /*
10126                                                  * JRS - Use the congestion
10127                                                  * control given in the
10128                                                  * congestion control module
10129                                                  */
10130                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10131                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10132                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10133                                                 }
10134                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10135                                         }
10136                                         net->fast_retran_ip = 0;
10137                                 } else {
10138                                         if (net->flight_size == 0) {
10139                                                 /*
10140                                                  * Should be decaying the
10141                                                  * cwnd here
10142                                                  */
10143                                                 ;
10144                                         }
10145                                 }
10146                         }
10147                 }
10148
10149         }
10150         burst_cnt = 0;
10151         do {
10152                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10153                     &reason_code, 0, from_where,
10154                     &now, &now_filled, frag_point, so_locked);
10155                 if (error) {
10156                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10157                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10158                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10159                         }
10160                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10161                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10162                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10163                         }
10164                         break;
10165                 }
10166                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10167
10168                 tot_out += num_out;
10169                 burst_cnt++;
10170                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10171                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10172                         if (num_out == 0) {
10173                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10174                         }
10175                 }
10176                 if (nagle_on) {
10177                         /*
10178                          * When the Nagle algorithm is used, look at how
10179                          * much is unsent, then if its smaller than an MTU
10180                          * and we have data in flight we stop, except if we
10181                          * are handling a fragmented user message.
10182                          */
10183                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10184                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10185                             (stcb->asoc.total_flight > 0)) {
10186 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10187                                 break;
10188                         }
10189                 }
10190                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10191                     TAILQ_EMPTY(&asoc->send_queue) &&
10192                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10193                         /* Nothing left to send */
10194                         break;
10195                 }
10196                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10197                         /* Nothing left to send */
10198                         break;
10199                 }
10200         } while (num_out &&
10201             ((asoc->max_burst == 0) ||
10202             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10203             (burst_cnt < asoc->max_burst)));
10204
10205         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10206                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10207                         SCTP_STAT_INCR(sctps_maxburstqueued);
10208                         asoc->burst_limit_applied = 1;
10209                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10210                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10211                         }
10212                 } else {
10213                         asoc->burst_limit_applied = 0;
10214                 }
10215         }
10216         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10217                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10218         }
10219         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10220             tot_out);
10221
10222         /*-
10223          * Now we need to clean up the control chunk chain if a ECNE is on
10224          * it. It must be marked as UNSENT again so next call will continue
10225          * to send it until such time that we get a CWR, to remove it.
10226          */
10227         if (stcb->asoc.ecn_echo_cnt_onq)
10228                 sctp_fix_ecn_echo(asoc);
10229
10230         if (stcb->asoc.trigger_reset) {
10231                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10232                         goto do_it_again;
10233                 }
10234         }
10235         return;
10236 }
10237
10238
10239 int
10240 sctp_output(
10241     struct sctp_inpcb *inp,
10242     struct mbuf *m,
10243     struct sockaddr *addr,
10244     struct mbuf *control,
10245     struct thread *p,
10246     int flags)
10247 {
10248         if (inp == NULL) {
10249                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10250                 return (EINVAL);
10251         }
10252         if (inp->sctp_socket == NULL) {
10253                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10254                 return (EINVAL);
10255         }
10256         return (sctp_sosend(inp->sctp_socket,
10257             addr,
10258             (struct uio *)NULL,
10259             m,
10260             control,
10261             flags, p
10262             ));
10263 }
10264
10265 void
10266 send_forward_tsn(struct sctp_tcb *stcb,
10267     struct sctp_association *asoc)
10268 {
10269         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10270         struct sctp_forward_tsn_chunk *fwdtsn;
10271         struct sctp_strseq *strseq;
10272         struct sctp_strseq_mid *strseq_m;
10273         uint32_t advance_peer_ack_point;
10274         unsigned int cnt_of_space, i, ovh;
10275         unsigned int space_needed;
10276         unsigned int cnt_of_skipped = 0;
10277
10278         SCTP_TCB_LOCK_ASSERT(stcb);
10279         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10280                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10281                         /* mark it to unsent */
10282                         chk->sent = SCTP_DATAGRAM_UNSENT;
10283                         chk->snd_count = 0;
10284                         /* Do we correct its output location? */
10285                         if (chk->whoTo) {
10286                                 sctp_free_remote_addr(chk->whoTo);
10287                                 chk->whoTo = NULL;
10288                         }
10289                         goto sctp_fill_in_rest;
10290                 }
10291         }
10292         /* Ok if we reach here we must build one */
10293         sctp_alloc_a_chunk(stcb, chk);
10294         if (chk == NULL) {
10295                 return;
10296         }
10297         asoc->fwd_tsn_cnt++;
10298         chk->copy_by_ref = 0;
10299         /*
10300          * We don't do the old thing here since this is used not for on-wire
10301          * but to tell if we are sending a fwd-tsn by the stack during
10302          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10303          */
10304         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10305         chk->rec.chunk_id.can_take_data = 0;
10306         chk->flags = 0;
10307         chk->asoc = asoc;
10308         chk->whoTo = NULL;
10309         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10310         if (chk->data == NULL) {
10311                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10312                 return;
10313         }
10314         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10315         chk->sent = SCTP_DATAGRAM_UNSENT;
10316         chk->snd_count = 0;
10317         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10318         asoc->ctrl_queue_cnt++;
10319 sctp_fill_in_rest:
10320         /*-
10321          * Here we go through and fill out the part that deals with
10322          * stream/seq of the ones we skip.
10323          */
10324         SCTP_BUF_LEN(chk->data) = 0;
10325         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10326                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10327                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10328                         /* no more to look at */
10329                         break;
10330                 }
10331                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10332                         /* We don't report these */
10333                         continue;
10334                 }
10335                 cnt_of_skipped++;
10336         }
10337         if (asoc->idata_supported) {
10338                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10339                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10340         } else {
10341                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10342                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10343         }
10344         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10345
10346         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10347                 ovh = SCTP_MIN_OVERHEAD;
10348         } else {
10349                 ovh = SCTP_MIN_V4_OVERHEAD;
10350         }
10351         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10352                 /* trim to a mtu size */
10353                 cnt_of_space = asoc->smallest_mtu - ovh;
10354         }
10355         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10356                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10357                     0xff, 0, cnt_of_skipped,
10358                     asoc->advanced_peer_ack_point);
10359         }
10360         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10361         if (cnt_of_space < space_needed) {
10362                 /*-
10363                  * ok we must trim down the chunk by lowering the
10364                  * advance peer ack point.
10365                  */
10366                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10367                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10368                             0xff, 0xff, cnt_of_space,
10369                             space_needed);
10370                 }
10371                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10372                 if (asoc->idata_supported) {
10373                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10374                 } else {
10375                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10376                 }
10377                 /*-
10378                  * Go through and find the TSN that will be the one
10379                  * we report.
10380                  */
10381                 at = TAILQ_FIRST(&asoc->sent_queue);
10382                 if (at != NULL) {
10383                         for (i = 0; i < cnt_of_skipped; i++) {
10384                                 tp1 = TAILQ_NEXT(at, sctp_next);
10385                                 if (tp1 == NULL) {
10386                                         break;
10387                                 }
10388                                 at = tp1;
10389                         }
10390                 }
10391                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10392                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10393                             0xff, cnt_of_skipped, at->rec.data.tsn,
10394                             asoc->advanced_peer_ack_point);
10395                 }
10396                 last = at;
10397                 /*-
10398                  * last now points to last one I can report, update
10399                  * peer ack point
10400                  */
10401                 if (last) {
10402                         advance_peer_ack_point = last->rec.data.tsn;
10403                 }
10404                 if (asoc->idata_supported) {
10405                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10406                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10407                 } else {
10408                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10409                             cnt_of_skipped * sizeof(struct sctp_strseq);
10410                 }
10411         }
10412         chk->send_size = space_needed;
10413         /* Setup the chunk */
10414         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10415         fwdtsn->ch.chunk_length = htons(chk->send_size);
10416         fwdtsn->ch.chunk_flags = 0;
10417         if (asoc->idata_supported) {
10418                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10419         } else {
10420                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10421         }
10422         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10423         SCTP_BUF_LEN(chk->data) = chk->send_size;
10424         fwdtsn++;
10425         /*-
10426          * Move pointer to after the fwdtsn and transfer to the
10427          * strseq pointer.
10428          */
10429         if (asoc->idata_supported) {
10430                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10431                 strseq = NULL;
10432         } else {
10433                 strseq = (struct sctp_strseq *)fwdtsn;
10434                 strseq_m = NULL;
10435         }
10436         /*-
10437          * Now populate the strseq list. This is done blindly
10438          * without pulling out duplicate stream info. This is
10439          * inefficent but won't harm the process since the peer will
10440          * look at these in sequence and will thus release anything.
10441          * It could mean we exceed the PMTU and chop off some that
10442          * we could have included.. but this is unlikely (aka 1432/4
10443          * would mean 300+ stream seq's would have to be reported in
10444          * one FWD-TSN. With a bit of work we can later FIX this to
10445          * optimize and pull out duplicates.. but it does add more
10446          * overhead. So for now... not!
10447          */
10448         i = 0;
10449         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10450                 if (i >= cnt_of_skipped) {
10451                         break;
10452                 }
10453                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10454                         /* We don't report these */
10455                         continue;
10456                 }
10457                 if (at->rec.data.tsn == advance_peer_ack_point) {
10458                         at->rec.data.fwd_tsn_cnt = 0;
10459                 }
10460                 if (asoc->idata_supported) {
10461                         strseq_m->sid = htons(at->rec.data.sid);
10462                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10463                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10464                         } else {
10465                                 strseq_m->flags = 0;
10466                         }
10467                         strseq_m->mid = htonl(at->rec.data.mid);
10468                         strseq_m++;
10469                 } else {
10470                         strseq->sid = htons(at->rec.data.sid);
10471                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10472                         strseq++;
10473                 }
10474                 i++;
10475         }
10476         return;
10477 }
10478
10479 void
10480 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10481 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10482     SCTP_UNUSED
10483 #endif
10484 )
10485 {
10486         /*-
10487          * Queue up a SACK or NR-SACK in the control queue.
10488          * We must first check to see if a SACK or NR-SACK is
10489          * somehow on the control queue.
10490          * If so, we will take and and remove the old one.
10491          */
10492         struct sctp_association *asoc;
10493         struct sctp_tmit_chunk *chk, *a_chk;
10494         struct sctp_sack_chunk *sack;
10495         struct sctp_nr_sack_chunk *nr_sack;
10496         struct sctp_gap_ack_block *gap_descriptor;
10497         const struct sack_track *selector;
10498         int mergeable = 0;
10499         int offset;
10500         caddr_t limit;
10501         uint32_t *dup;
10502         int limit_reached = 0;
10503         unsigned int i, siz, j;
10504         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10505         int num_dups = 0;
10506         int space_req;
10507         uint32_t highest_tsn;
10508         uint8_t flags;
10509         uint8_t type;
10510         uint8_t tsn_map;
10511
10512         if (stcb->asoc.nrsack_supported == 1) {
10513                 type = SCTP_NR_SELECTIVE_ACK;
10514         } else {
10515                 type = SCTP_SELECTIVE_ACK;
10516         }
10517         a_chk = NULL;
10518         asoc = &stcb->asoc;
10519         SCTP_TCB_LOCK_ASSERT(stcb);
10520         if (asoc->last_data_chunk_from == NULL) {
10521                 /* Hmm we never received anything */
10522                 return;
10523         }
10524         sctp_slide_mapping_arrays(stcb);
10525         sctp_set_rwnd(stcb, asoc);
10526         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10527                 if (chk->rec.chunk_id.id == type) {
10528                         /* Hmm, found a sack already on queue, remove it */
10529                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10530                         asoc->ctrl_queue_cnt--;
10531                         a_chk = chk;
10532                         if (a_chk->data) {
10533                                 sctp_m_freem(a_chk->data);
10534                                 a_chk->data = NULL;
10535                         }
10536                         if (a_chk->whoTo) {
10537                                 sctp_free_remote_addr(a_chk->whoTo);
10538                                 a_chk->whoTo = NULL;
10539                         }
10540                         break;
10541                 }
10542         }
10543         if (a_chk == NULL) {
10544                 sctp_alloc_a_chunk(stcb, a_chk);
10545                 if (a_chk == NULL) {
10546                         /* No memory so we drop the idea, and set a timer */
10547                         if (stcb->asoc.delayed_ack) {
10548                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10549                                     stcb->sctp_ep, stcb, NULL,
10550                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10551                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10552                                     stcb->sctp_ep, stcb, NULL);
10553                         } else {
10554                                 stcb->asoc.send_sack = 1;
10555                         }
10556                         return;
10557                 }
10558                 a_chk->copy_by_ref = 0;
10559                 a_chk->rec.chunk_id.id = type;
10560                 a_chk->rec.chunk_id.can_take_data = 1;
10561         }
10562         /* Clear our pkt counts */
10563         asoc->data_pkts_seen = 0;
10564
10565         a_chk->flags = 0;
10566         a_chk->asoc = asoc;
10567         a_chk->snd_count = 0;
10568         a_chk->send_size = 0;   /* fill in later */
10569         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10570         a_chk->whoTo = NULL;
10571
10572         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10573                 /*-
10574                  * Ok, the destination for the SACK is unreachable, lets see if
10575                  * we can select an alternate to asoc->last_data_chunk_from
10576                  */
10577                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10578                 if (a_chk->whoTo == NULL) {
10579                         /* Nope, no alternate */
10580                         a_chk->whoTo = asoc->last_data_chunk_from;
10581                 }
10582         } else {
10583                 a_chk->whoTo = asoc->last_data_chunk_from;
10584         }
10585         if (a_chk->whoTo) {
10586                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10587         }
10588         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10589                 highest_tsn = asoc->highest_tsn_inside_map;
10590         } else {
10591                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10592         }
10593         if (highest_tsn == asoc->cumulative_tsn) {
10594                 /* no gaps */
10595                 if (type == SCTP_SELECTIVE_ACK) {
10596                         space_req = sizeof(struct sctp_sack_chunk);
10597                 } else {
10598                         space_req = sizeof(struct sctp_nr_sack_chunk);
10599                 }
10600         } else {
10601                 /* gaps get a cluster */
10602                 space_req = MCLBYTES;
10603         }
10604         /* Ok now lets formulate a MBUF with our sack */
10605         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10606         if ((a_chk->data == NULL) ||
10607             (a_chk->whoTo == NULL)) {
10608                 /* rats, no mbuf memory */
10609                 if (a_chk->data) {
10610                         /* was a problem with the destination */
10611                         sctp_m_freem(a_chk->data);
10612                         a_chk->data = NULL;
10613                 }
10614                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10615                 /* sa_ignore NO_NULL_CHK */
10616                 if (stcb->asoc.delayed_ack) {
10617                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10618                             stcb->sctp_ep, stcb, NULL,
10619                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10620                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10621                             stcb->sctp_ep, stcb, NULL);
10622                 } else {
10623                         stcb->asoc.send_sack = 1;
10624                 }
10625                 return;
10626         }
10627         /* ok, lets go through and fill it in */
10628         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10629         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10630         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10631                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10632         }
10633         limit = mtod(a_chk->data, caddr_t);
10634         limit += space;
10635
10636         flags = 0;
10637
10638         if ((asoc->sctp_cmt_on_off > 0) &&
10639             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10640                 /*-
10641                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10642                  * received, then set high bit to 1, else 0. Reset
10643                  * pkts_rcvd.
10644                  */
10645                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10646                 asoc->cmt_dac_pkts_rcvd = 0;
10647         }
10648 #ifdef SCTP_ASOCLOG_OF_TSNS
10649         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10650         stcb->asoc.cumack_log_atsnt++;
10651         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10652                 stcb->asoc.cumack_log_atsnt = 0;
10653         }
10654 #endif
10655         /* reset the readers interpretation */
10656         stcb->freed_by_sorcv_sincelast = 0;
10657
10658         if (type == SCTP_SELECTIVE_ACK) {
10659                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10660                 nr_sack = NULL;
10661                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10662                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10663                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10664                 } else {
10665                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10666                 }
10667         } else {
10668                 sack = NULL;
10669                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10670                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10671                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10672                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10673                 } else {
10674                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10675                 }
10676         }
10677
10678         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10679                 offset = 1;
10680         } else {
10681                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10682         }
10683         if (((type == SCTP_SELECTIVE_ACK) &&
10684             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10685             ((type == SCTP_NR_SELECTIVE_ACK) &&
10686             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10687                 /* we have a gap .. maybe */
10688                 for (i = 0; i < siz; i++) {
10689                         tsn_map = asoc->mapping_array[i];
10690                         if (type == SCTP_SELECTIVE_ACK) {
10691                                 tsn_map |= asoc->nr_mapping_array[i];
10692                         }
10693                         if (i == 0) {
10694                                 /*
10695                                  * Clear all bits corresponding to TSNs
10696                                  * smaller or equal to the cumulative TSN.
10697                                  */
10698                                 tsn_map &= (~0U << (1 - offset));
10699                         }
10700                         selector = &sack_array[tsn_map];
10701                         if (mergeable && selector->right_edge) {
10702                                 /*
10703                                  * Backup, left and right edges were ok to
10704                                  * merge.
10705                                  */
10706                                 num_gap_blocks--;
10707                                 gap_descriptor--;
10708                         }
10709                         if (selector->num_entries == 0)
10710                                 mergeable = 0;
10711                         else {
10712                                 for (j = 0; j < selector->num_entries; j++) {
10713                                         if (mergeable && selector->right_edge) {
10714                                                 /*
10715                                                  * do a merge by NOT setting
10716                                                  * the left side
10717                                                  */
10718                                                 mergeable = 0;
10719                                         } else {
10720                                                 /*
10721                                                  * no merge, set the left
10722                                                  * side
10723                                                  */
10724                                                 mergeable = 0;
10725                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10726                                         }
10727                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10728                                         num_gap_blocks++;
10729                                         gap_descriptor++;
10730                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10731                                                 /* no more room */
10732                                                 limit_reached = 1;
10733                                                 break;
10734                                         }
10735                                 }
10736                                 if (selector->left_edge) {
10737                                         mergeable = 1;
10738                                 }
10739                         }
10740                         if (limit_reached) {
10741                                 /* Reached the limit stop */
10742                                 break;
10743                         }
10744                         offset += 8;
10745                 }
10746         }
10747         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10748             (limit_reached == 0)) {
10749
10750                 mergeable = 0;
10751
10752                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10753                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10754                 } else {
10755                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10756                 }
10757
10758                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10759                         offset = 1;
10760                 } else {
10761                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10762                 }
10763                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10764                         /* we have a gap .. maybe */
10765                         for (i = 0; i < siz; i++) {
10766                                 tsn_map = asoc->nr_mapping_array[i];
10767                                 if (i == 0) {
10768                                         /*
10769                                          * Clear all bits corresponding to
10770                                          * TSNs smaller or equal to the
10771                                          * cumulative TSN.
10772                                          */
10773                                         tsn_map &= (~0U << (1 - offset));
10774                                 }
10775                                 selector = &sack_array[tsn_map];
10776                                 if (mergeable && selector->right_edge) {
10777                                         /*
10778                                          * Backup, left and right edges were
10779                                          * ok to merge.
10780                                          */
10781                                         num_nr_gap_blocks--;
10782                                         gap_descriptor--;
10783                                 }
10784                                 if (selector->num_entries == 0)
10785                                         mergeable = 0;
10786                                 else {
10787                                         for (j = 0; j < selector->num_entries; j++) {
10788                                                 if (mergeable && selector->right_edge) {
10789                                                         /*
10790                                                          * do a merge by NOT
10791                                                          * setting the left
10792                                                          * side
10793                                                          */
10794                                                         mergeable = 0;
10795                                                 } else {
10796                                                         /*
10797                                                          * no merge, set the
10798                                                          * left side
10799                                                          */
10800                                                         mergeable = 0;
10801                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10802                                                 }
10803                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10804                                                 num_nr_gap_blocks++;
10805                                                 gap_descriptor++;
10806                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10807                                                         /* no more room */
10808                                                         limit_reached = 1;
10809                                                         break;
10810                                                 }
10811                                         }
10812                                         if (selector->left_edge) {
10813                                                 mergeable = 1;
10814                                         }
10815                                 }
10816                                 if (limit_reached) {
10817                                         /* Reached the limit stop */
10818                                         break;
10819                                 }
10820                                 offset += 8;
10821                         }
10822                 }
10823         }
10824         /* now we must add any dups we are going to report. */
10825         if ((limit_reached == 0) && (asoc->numduptsns)) {
10826                 dup = (uint32_t *)gap_descriptor;
10827                 for (i = 0; i < asoc->numduptsns; i++) {
10828                         *dup = htonl(asoc->dup_tsns[i]);
10829                         dup++;
10830                         num_dups++;
10831                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10832                                 /* no more room */
10833                                 break;
10834                         }
10835                 }
10836                 asoc->numduptsns = 0;
10837         }
10838         /*
10839          * now that the chunk is prepared queue it to the control chunk
10840          * queue.
10841          */
10842         if (type == SCTP_SELECTIVE_ACK) {
10843                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10844                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10845                     num_dups * sizeof(int32_t));
10846                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10847                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10848                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10849                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10850                 sack->sack.num_dup_tsns = htons(num_dups);
10851                 sack->ch.chunk_type = type;
10852                 sack->ch.chunk_flags = flags;
10853                 sack->ch.chunk_length = htons(a_chk->send_size);
10854         } else {
10855                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10856                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10857                     num_dups * sizeof(int32_t));
10858                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10859                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10860                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10861                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10862                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10863                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10864                 nr_sack->nr_sack.reserved = 0;
10865                 nr_sack->ch.chunk_type = type;
10866                 nr_sack->ch.chunk_flags = flags;
10867                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10868         }
10869         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10870         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10871         asoc->ctrl_queue_cnt++;
10872         asoc->send_sack = 0;
10873         SCTP_STAT_INCR(sctps_sendsacks);
10874         return;
10875 }
10876
10877 void
10878 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10879 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10880     SCTP_UNUSED
10881 #endif
10882 )
10883 {
10884         struct mbuf *m_abort, *m, *m_last;
10885         struct mbuf *m_out, *m_end = NULL;
10886         struct sctp_abort_chunk *abort;
10887         struct sctp_auth_chunk *auth = NULL;
10888         struct sctp_nets *net;
10889         uint32_t vtag;
10890         uint32_t auth_offset = 0;
10891         int error;
10892         uint16_t cause_len, chunk_len, padding_len;
10893
10894         SCTP_TCB_LOCK_ASSERT(stcb);
10895         /*-
10896          * Add an AUTH chunk, if chunk requires it and save the offset into
10897          * the chain for AUTH
10898          */
10899         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10900             stcb->asoc.peer_auth_chunks)) {
10901                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10902                     stcb, SCTP_ABORT_ASSOCIATION);
10903                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10904         } else {
10905                 m_out = NULL;
10906         }
10907         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10908         if (m_abort == NULL) {
10909                 if (m_out) {
10910                         sctp_m_freem(m_out);
10911                 }
10912                 if (operr) {
10913                         sctp_m_freem(operr);
10914                 }
10915                 return;
10916         }
10917         /* link in any error */
10918         SCTP_BUF_NEXT(m_abort) = operr;
10919         cause_len = 0;
10920         m_last = NULL;
10921         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10922                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10923                 if (SCTP_BUF_NEXT(m) == NULL) {
10924                         m_last = m;
10925                 }
10926         }
10927         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10928         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10929         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10930         if (m_out == NULL) {
10931                 /* NO Auth chunk prepended, so reserve space in front */
10932                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10933                 m_out = m_abort;
10934         } else {
10935                 /* Put AUTH chunk at the front of the chain */
10936                 SCTP_BUF_NEXT(m_end) = m_abort;
10937         }
10938         if (stcb->asoc.alternate) {
10939                 net = stcb->asoc.alternate;
10940         } else {
10941                 net = stcb->asoc.primary_destination;
10942         }
10943         /* Fill in the ABORT chunk header. */
10944         abort = mtod(m_abort, struct sctp_abort_chunk *);
10945         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10946         if (stcb->asoc.peer_vtag == 0) {
10947                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10948                 vtag = stcb->asoc.my_vtag;
10949                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10950         } else {
10951                 vtag = stcb->asoc.peer_vtag;
10952                 abort->ch.chunk_flags = 0;
10953         }
10954         abort->ch.chunk_length = htons(chunk_len);
10955         /* Add padding, if necessary. */
10956         if (padding_len > 0) {
10957                 if ((m_last == NULL) ||
10958                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10959                         sctp_m_freem(m_out);
10960                         return;
10961                 }
10962         }
10963         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10964             (struct sockaddr *)&net->ro._l_addr,
10965             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10966             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10967             stcb->asoc.primary_destination->port, NULL,
10968             0, 0,
10969             so_locked))) {
10970                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10971                 if (error == ENOBUFS) {
10972                         stcb->asoc.ifp_had_enobuf = 1;
10973                         SCTP_STAT_INCR(sctps_lowlevelerr);
10974                 }
10975         } else {
10976                 stcb->asoc.ifp_had_enobuf = 0;
10977         }
10978         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10979 }
10980
10981 void
10982 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10983     struct sctp_nets *net,
10984     int reflect_vtag)
10985 {
10986         /* formulate and SEND a SHUTDOWN-COMPLETE */
10987         struct mbuf *m_shutdown_comp;
10988         struct sctp_shutdown_complete_chunk *shutdown_complete;
10989         uint32_t vtag;
10990         int error;
10991         uint8_t flags;
10992
10993         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10994         if (m_shutdown_comp == NULL) {
10995                 /* no mbuf's */
10996                 return;
10997         }
10998         if (reflect_vtag) {
10999                 flags = SCTP_HAD_NO_TCB;
11000                 vtag = stcb->asoc.my_vtag;
11001         } else {
11002                 flags = 0;
11003                 vtag = stcb->asoc.peer_vtag;
11004         }
11005         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11006         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11007         shutdown_complete->ch.chunk_flags = flags;
11008         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11009         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11010         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11011             (struct sockaddr *)&net->ro._l_addr,
11012             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11013             stcb->sctp_ep->sctp_lport, stcb->rport,
11014             htonl(vtag),
11015             net->port, NULL,
11016             0, 0,
11017             SCTP_SO_NOT_LOCKED))) {
11018                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11019                 if (error == ENOBUFS) {
11020                         stcb->asoc.ifp_had_enobuf = 1;
11021                         SCTP_STAT_INCR(sctps_lowlevelerr);
11022                 }
11023         } else {
11024                 stcb->asoc.ifp_had_enobuf = 0;
11025         }
11026         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11027         return;
11028 }
11029
11030 static void
11031 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11032     struct sctphdr *sh, uint32_t vtag,
11033     uint8_t type, struct mbuf *cause,
11034     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11035     uint32_t vrf_id, uint16_t port)
11036 {
11037         struct mbuf *o_pak;
11038         struct mbuf *mout;
11039         struct sctphdr *shout;
11040         struct sctp_chunkhdr *ch;
11041 #if defined(INET) || defined(INET6)
11042         struct udphdr *udp;
11043         int ret;
11044 #endif
11045         int len, cause_len, padding_len;
11046 #ifdef INET
11047         struct sockaddr_in *src_sin, *dst_sin;
11048         struct ip *ip;
11049 #endif
11050 #ifdef INET6
11051         struct sockaddr_in6 *src_sin6, *dst_sin6;
11052         struct ip6_hdr *ip6;
11053 #endif
11054
11055         /* Compute the length of the cause and add final padding. */
11056         cause_len = 0;
11057         if (cause != NULL) {
11058                 struct mbuf *m_at, *m_last = NULL;
11059
11060                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11061                         if (SCTP_BUF_NEXT(m_at) == NULL)
11062                                 m_last = m_at;
11063                         cause_len += SCTP_BUF_LEN(m_at);
11064                 }
11065                 padding_len = cause_len % 4;
11066                 if (padding_len != 0) {
11067                         padding_len = 4 - padding_len;
11068                 }
11069                 if (padding_len != 0) {
11070                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11071                                 sctp_m_freem(cause);
11072                                 return;
11073                         }
11074                 }
11075         } else {
11076                 padding_len = 0;
11077         }
11078         /* Get an mbuf for the header. */
11079         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11080         switch (dst->sa_family) {
11081 #ifdef INET
11082         case AF_INET:
11083                 len += sizeof(struct ip);
11084                 break;
11085 #endif
11086 #ifdef INET6
11087         case AF_INET6:
11088                 len += sizeof(struct ip6_hdr);
11089                 break;
11090 #endif
11091         default:
11092                 break;
11093         }
11094 #if defined(INET) || defined(INET6)
11095         if (port) {
11096                 len += sizeof(struct udphdr);
11097         }
11098 #endif
11099         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11100         if (mout == NULL) {
11101                 if (cause) {
11102                         sctp_m_freem(cause);
11103                 }
11104                 return;
11105         }
11106         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11107         SCTP_BUF_LEN(mout) = len;
11108         SCTP_BUF_NEXT(mout) = cause;
11109         M_SETFIB(mout, fibnum);
11110         mout->m_pkthdr.flowid = mflowid;
11111         M_HASHTYPE_SET(mout, mflowtype);
11112 #ifdef INET
11113         ip = NULL;
11114 #endif
11115 #ifdef INET6
11116         ip6 = NULL;
11117 #endif
11118         switch (dst->sa_family) {
11119 #ifdef INET
11120         case AF_INET:
11121                 src_sin = (struct sockaddr_in *)src;
11122                 dst_sin = (struct sockaddr_in *)dst;
11123                 ip = mtod(mout, struct ip *);
11124                 ip->ip_v = IPVERSION;
11125                 ip->ip_hl = (sizeof(struct ip) >> 2);
11126                 ip->ip_tos = 0;
11127                 ip->ip_off = htons(IP_DF);
11128                 ip_fillid(ip);
11129                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11130                 if (port) {
11131                         ip->ip_p = IPPROTO_UDP;
11132                 } else {
11133                         ip->ip_p = IPPROTO_SCTP;
11134                 }
11135                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11136                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11137                 ip->ip_sum = 0;
11138                 len = sizeof(struct ip);
11139                 shout = (struct sctphdr *)((caddr_t)ip + len);
11140                 break;
11141 #endif
11142 #ifdef INET6
11143         case AF_INET6:
11144                 src_sin6 = (struct sockaddr_in6 *)src;
11145                 dst_sin6 = (struct sockaddr_in6 *)dst;
11146                 ip6 = mtod(mout, struct ip6_hdr *);
11147                 ip6->ip6_flow = htonl(0x60000000);
11148                 if (V_ip6_auto_flowlabel) {
11149                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11150                 }
11151                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11152                 if (port) {
11153                         ip6->ip6_nxt = IPPROTO_UDP;
11154                 } else {
11155                         ip6->ip6_nxt = IPPROTO_SCTP;
11156                 }
11157                 ip6->ip6_src = dst_sin6->sin6_addr;
11158                 ip6->ip6_dst = src_sin6->sin6_addr;
11159                 len = sizeof(struct ip6_hdr);
11160                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11161                 break;
11162 #endif
11163         default:
11164                 len = 0;
11165                 shout = mtod(mout, struct sctphdr *);
11166                 break;
11167         }
11168 #if defined(INET) || defined(INET6)
11169         if (port) {
11170                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11171                         sctp_m_freem(mout);
11172                         return;
11173                 }
11174                 udp = (struct udphdr *)shout;
11175                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11176                 udp->uh_dport = port;
11177                 udp->uh_sum = 0;
11178                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11179                     sizeof(struct sctphdr) +
11180                     sizeof(struct sctp_chunkhdr) +
11181                     cause_len + padding_len));
11182                 len += sizeof(struct udphdr);
11183                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11184         } else {
11185                 udp = NULL;
11186         }
11187 #endif
11188         shout->src_port = sh->dest_port;
11189         shout->dest_port = sh->src_port;
11190         shout->checksum = 0;
11191         if (vtag) {
11192                 shout->v_tag = htonl(vtag);
11193         } else {
11194                 shout->v_tag = sh->v_tag;
11195         }
11196         len += sizeof(struct sctphdr);
11197         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11198         ch->chunk_type = type;
11199         if (vtag) {
11200                 ch->chunk_flags = 0;
11201         } else {
11202                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11203         }
11204         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11205         len += sizeof(struct sctp_chunkhdr);
11206         len += cause_len + padding_len;
11207
11208         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11209                 sctp_m_freem(mout);
11210                 return;
11211         }
11212         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11213         switch (dst->sa_family) {
11214 #ifdef INET
11215         case AF_INET:
11216                 if (port) {
11217                         if (V_udp_cksum) {
11218                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11219                         } else {
11220                                 udp->uh_sum = 0;
11221                         }
11222                 }
11223                 ip->ip_len = htons(len);
11224                 if (port) {
11225 #if defined(SCTP_WITH_NO_CSUM)
11226                         SCTP_STAT_INCR(sctps_sendnocrc);
11227 #else
11228                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11229                         SCTP_STAT_INCR(sctps_sendswcrc);
11230 #endif
11231                         if (V_udp_cksum) {
11232                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11233                         }
11234                 } else {
11235 #if defined(SCTP_WITH_NO_CSUM)
11236                         SCTP_STAT_INCR(sctps_sendnocrc);
11237 #else
11238                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11239                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11240                         SCTP_STAT_INCR(sctps_sendhwcrc);
11241 #endif
11242                 }
11243 #ifdef SCTP_PACKET_LOGGING
11244                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11245                         sctp_packet_log(o_pak);
11246                 }
11247 #endif
11248                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11249                 break;
11250 #endif
11251 #ifdef INET6
11252         case AF_INET6:
11253                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11254                 if (port) {
11255 #if defined(SCTP_WITH_NO_CSUM)
11256                         SCTP_STAT_INCR(sctps_sendnocrc);
11257 #else
11258                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11259                         SCTP_STAT_INCR(sctps_sendswcrc);
11260 #endif
11261                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11262                                 udp->uh_sum = 0xffff;
11263                         }
11264                 } else {
11265 #if defined(SCTP_WITH_NO_CSUM)
11266                         SCTP_STAT_INCR(sctps_sendnocrc);
11267 #else
11268                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11269                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11270                         SCTP_STAT_INCR(sctps_sendhwcrc);
11271 #endif
11272                 }
11273 #ifdef SCTP_PACKET_LOGGING
11274                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11275                         sctp_packet_log(o_pak);
11276                 }
11277 #endif
11278                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11279                 break;
11280 #endif
11281         default:
11282                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11283                     dst->sa_family);
11284                 sctp_m_freem(mout);
11285                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11286                 return;
11287         }
11288         SCTP_STAT_INCR(sctps_sendpackets);
11289         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11290         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11291         return;
11292 }
11293
11294 void
11295 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11296     struct sctphdr *sh,
11297     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11298     uint32_t vrf_id, uint16_t port)
11299 {
11300         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11301             mflowtype, mflowid, fibnum,
11302             vrf_id, port);
11303 }
11304
11305 void
11306 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11307 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11308     SCTP_UNUSED
11309 #endif
11310 )
11311 {
11312         struct sctp_tmit_chunk *chk;
11313         struct sctp_heartbeat_chunk *hb;
11314         struct timeval now;
11315
11316         SCTP_TCB_LOCK_ASSERT(stcb);
11317         if (net == NULL) {
11318                 return;
11319         }
11320         (void)SCTP_GETTIME_TIMEVAL(&now);
11321         switch (net->ro._l_addr.sa.sa_family) {
11322 #ifdef INET
11323         case AF_INET:
11324                 break;
11325 #endif
11326 #ifdef INET6
11327         case AF_INET6:
11328                 break;
11329 #endif
11330         default:
11331                 return;
11332         }
11333         sctp_alloc_a_chunk(stcb, chk);
11334         if (chk == NULL) {
11335                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11336                 return;
11337         }
11338         chk->copy_by_ref = 0;
11339         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11340         chk->rec.chunk_id.can_take_data = 1;
11341         chk->flags = 0;
11342         chk->asoc = &stcb->asoc;
11343         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11344
11345         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11346         if (chk->data == NULL) {
11347                 sctp_free_a_chunk(stcb, chk, so_locked);
11348                 return;
11349         }
11350         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11351         SCTP_BUF_LEN(chk->data) = chk->send_size;
11352         chk->sent = SCTP_DATAGRAM_UNSENT;
11353         chk->snd_count = 0;
11354         chk->whoTo = net;
11355         atomic_add_int(&chk->whoTo->ref_count, 1);
11356         /* Now we have a mbuf that we can fill in with the details */
11357         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11358         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11359         /* fill out chunk header */
11360         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11361         hb->ch.chunk_flags = 0;
11362         hb->ch.chunk_length = htons(chk->send_size);
11363         /* Fill out hb parameter */
11364         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11365         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11366         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11367         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11368         /* Did our user request this one, put it in */
11369         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11370         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11371         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11372                 /*
11373                  * we only take from the entropy pool if the address is not
11374                  * confirmed.
11375                  */
11376                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11377                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11378         } else {
11379                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11380                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11381         }
11382         switch (net->ro._l_addr.sa.sa_family) {
11383 #ifdef INET
11384         case AF_INET:
11385                 memcpy(hb->heartbeat.hb_info.address,
11386                     &net->ro._l_addr.sin.sin_addr,
11387                     sizeof(net->ro._l_addr.sin.sin_addr));
11388                 break;
11389 #endif
11390 #ifdef INET6
11391         case AF_INET6:
11392                 memcpy(hb->heartbeat.hb_info.address,
11393                     &net->ro._l_addr.sin6.sin6_addr,
11394                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11395                 break;
11396 #endif
11397         default:
11398                 if (chk->data) {
11399                         sctp_m_freem(chk->data);
11400                         chk->data = NULL;
11401                 }
11402                 sctp_free_a_chunk(stcb, chk, so_locked);
11403                 return;
11404                 break;
11405         }
11406         net->hb_responded = 0;
11407         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11408         stcb->asoc.ctrl_queue_cnt++;
11409         SCTP_STAT_INCR(sctps_sendheartbeat);
11410         return;
11411 }
11412
11413 void
11414 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11415     uint32_t high_tsn)
11416 {
11417         struct sctp_association *asoc;
11418         struct sctp_ecne_chunk *ecne;
11419         struct sctp_tmit_chunk *chk;
11420
11421         if (net == NULL) {
11422                 return;
11423         }
11424         asoc = &stcb->asoc;
11425         SCTP_TCB_LOCK_ASSERT(stcb);
11426         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11427                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11428                         /* found a previous ECN_ECHO update it if needed */
11429                         uint32_t cnt, ctsn;
11430
11431                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11432                         ctsn = ntohl(ecne->tsn);
11433                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11434                                 ecne->tsn = htonl(high_tsn);
11435                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11436                         }
11437                         cnt = ntohl(ecne->num_pkts_since_cwr);
11438                         cnt++;
11439                         ecne->num_pkts_since_cwr = htonl(cnt);
11440                         return;
11441                 }
11442         }
11443         /* nope could not find one to update so we must build one */
11444         sctp_alloc_a_chunk(stcb, chk);
11445         if (chk == NULL) {
11446                 return;
11447         }
11448         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11449         chk->copy_by_ref = 0;
11450         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11451         chk->rec.chunk_id.can_take_data = 0;
11452         chk->flags = 0;
11453         chk->asoc = &stcb->asoc;
11454         chk->send_size = sizeof(struct sctp_ecne_chunk);
11455         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11456         if (chk->data == NULL) {
11457                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11458                 return;
11459         }
11460         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11461         SCTP_BUF_LEN(chk->data) = chk->send_size;
11462         chk->sent = SCTP_DATAGRAM_UNSENT;
11463         chk->snd_count = 0;
11464         chk->whoTo = net;
11465         atomic_add_int(&chk->whoTo->ref_count, 1);
11466
11467         stcb->asoc.ecn_echo_cnt_onq++;
11468         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11469         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11470         ecne->ch.chunk_flags = 0;
11471         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11472         ecne->tsn = htonl(high_tsn);
11473         ecne->num_pkts_since_cwr = htonl(1);
11474         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11475         asoc->ctrl_queue_cnt++;
11476 }
11477
11478 void
11479 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11480     struct mbuf *m, int len, int iphlen, int bad_crc)
11481 {
11482         struct sctp_association *asoc;
11483         struct sctp_pktdrop_chunk *drp;
11484         struct sctp_tmit_chunk *chk;
11485         uint8_t *datap;
11486         int was_trunc = 0;
11487         int fullsz = 0;
11488         long spc;
11489         int offset;
11490         struct sctp_chunkhdr *ch, chunk_buf;
11491         unsigned int chk_length;
11492
11493         if (!stcb) {
11494                 return;
11495         }
11496         asoc = &stcb->asoc;
11497         SCTP_TCB_LOCK_ASSERT(stcb);
11498         if (asoc->pktdrop_supported == 0) {
11499                 /*-
11500                  * peer must declare support before I send one.
11501                  */
11502                 return;
11503         }
11504         if (stcb->sctp_socket == NULL) {
11505                 return;
11506         }
11507         sctp_alloc_a_chunk(stcb, chk);
11508         if (chk == NULL) {
11509                 return;
11510         }
11511         chk->copy_by_ref = 0;
11512         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11513         chk->rec.chunk_id.can_take_data = 1;
11514         chk->flags = 0;
11515         len -= iphlen;
11516         chk->send_size = len;
11517         /* Validate that we do not have an ABORT in here. */
11518         offset = iphlen + sizeof(struct sctphdr);
11519         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11520             sizeof(*ch), (uint8_t *)&chunk_buf);
11521         while (ch != NULL) {
11522                 chk_length = ntohs(ch->chunk_length);
11523                 if (chk_length < sizeof(*ch)) {
11524                         /* break to abort land */
11525                         break;
11526                 }
11527                 switch (ch->chunk_type) {
11528                 case SCTP_PACKET_DROPPED:
11529                 case SCTP_ABORT_ASSOCIATION:
11530                 case SCTP_INITIATION_ACK:
11531                         /**
11532                          * We don't respond with an PKT-DROP to an ABORT
11533                          * or PKT-DROP. We also do not respond to an
11534                          * INIT-ACK, because we can't know if the initiation
11535                          * tag is correct or not.
11536                          */
11537                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11538                         return;
11539                 default:
11540                         break;
11541                 }
11542                 offset += SCTP_SIZE32(chk_length);
11543                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11544                     sizeof(*ch), (uint8_t *)&chunk_buf);
11545         }
11546
11547         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11548             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11549                 /*
11550                  * only send 1 mtu worth, trim off the excess on the end.
11551                  */
11552                 fullsz = len;
11553                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11554                 was_trunc = 1;
11555         }
11556         chk->asoc = &stcb->asoc;
11557         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11558         if (chk->data == NULL) {
11559 jump_out:
11560                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11561                 return;
11562         }
11563         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11564         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11565         if (drp == NULL) {
11566                 sctp_m_freem(chk->data);
11567                 chk->data = NULL;
11568                 goto jump_out;
11569         }
11570         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11571             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11572         chk->book_size_scale = 0;
11573         if (was_trunc) {
11574                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11575                 drp->trunc_len = htons(fullsz);
11576                 /*
11577                  * Len is already adjusted to size minus overhead above take
11578                  * out the pkt_drop chunk itself from it.
11579                  */
11580                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11581                 len = chk->send_size;
11582         } else {
11583                 /* no truncation needed */
11584                 drp->ch.chunk_flags = 0;
11585                 drp->trunc_len = htons(0);
11586         }
11587         if (bad_crc) {
11588                 drp->ch.chunk_flags |= SCTP_BADCRC;
11589         }
11590         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11591         SCTP_BUF_LEN(chk->data) = chk->send_size;
11592         chk->sent = SCTP_DATAGRAM_UNSENT;
11593         chk->snd_count = 0;
11594         if (net) {
11595                 /* we should hit here */
11596                 chk->whoTo = net;
11597                 atomic_add_int(&chk->whoTo->ref_count, 1);
11598         } else {
11599                 chk->whoTo = NULL;
11600         }
11601         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11602         drp->ch.chunk_length = htons(chk->send_size);
11603         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11604         if (spc < 0) {
11605                 spc = 0;
11606         }
11607         drp->bottle_bw = htonl(spc);
11608         if (asoc->my_rwnd) {
11609                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11610                     asoc->size_on_all_streams +
11611                     asoc->my_rwnd_control_len +
11612                     stcb->sctp_socket->so_rcv.sb_cc);
11613         } else {
11614                 /*-
11615                  * If my rwnd is 0, possibly from mbuf depletion as well as
11616                  * space used, tell the peer there is NO space aka onq == bw
11617                  */
11618                 drp->current_onq = htonl(spc);
11619         }
11620         drp->reserved = 0;
11621         datap = drp->data;
11622         m_copydata(m, iphlen, len, (caddr_t)datap);
11623         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11624         asoc->ctrl_queue_cnt++;
11625 }
11626
11627 void
11628 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11629 {
11630         struct sctp_association *asoc;
11631         struct sctp_cwr_chunk *cwr;
11632         struct sctp_tmit_chunk *chk;
11633
11634         SCTP_TCB_LOCK_ASSERT(stcb);
11635         if (net == NULL) {
11636                 return;
11637         }
11638         asoc = &stcb->asoc;
11639         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11640                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11641                         /*
11642                          * found a previous CWR queued to same destination
11643                          * update it if needed
11644                          */
11645                         uint32_t ctsn;
11646
11647                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11648                         ctsn = ntohl(cwr->tsn);
11649                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11650                                 cwr->tsn = htonl(high_tsn);
11651                         }
11652                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11653                                 /* Make sure override is carried */
11654                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11655                         }
11656                         return;
11657                 }
11658         }
11659         sctp_alloc_a_chunk(stcb, chk);
11660         if (chk == NULL) {
11661                 return;
11662         }
11663         chk->copy_by_ref = 0;
11664         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11665         chk->rec.chunk_id.can_take_data = 1;
11666         chk->flags = 0;
11667         chk->asoc = &stcb->asoc;
11668         chk->send_size = sizeof(struct sctp_cwr_chunk);
11669         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11670         if (chk->data == NULL) {
11671                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11672                 return;
11673         }
11674         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11675         SCTP_BUF_LEN(chk->data) = chk->send_size;
11676         chk->sent = SCTP_DATAGRAM_UNSENT;
11677         chk->snd_count = 0;
11678         chk->whoTo = net;
11679         atomic_add_int(&chk->whoTo->ref_count, 1);
11680         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11681         cwr->ch.chunk_type = SCTP_ECN_CWR;
11682         cwr->ch.chunk_flags = override;
11683         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11684         cwr->tsn = htonl(high_tsn);
11685         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11686         asoc->ctrl_queue_cnt++;
11687 }
11688
11689 static int
11690 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11691     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11692 {
11693         uint16_t len, old_len, i;
11694         struct sctp_stream_reset_out_request *req_out;
11695         struct sctp_chunkhdr *ch;
11696         int at;
11697         int number_entries = 0;
11698
11699         ch = mtod(chk->data, struct sctp_chunkhdr *);
11700         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11701         /* get to new offset for the param. */
11702         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11703         /* now how long will this param be? */
11704         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11705                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11706                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11707                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11708                         number_entries++;
11709                 }
11710         }
11711         if (number_entries == 0) {
11712                 return (0);
11713         }
11714         if (number_entries == stcb->asoc.streamoutcnt) {
11715                 number_entries = 0;
11716         }
11717         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11718                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11719         }
11720         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11721         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11722         req_out->ph.param_length = htons(len);
11723         req_out->request_seq = htonl(seq);
11724         req_out->response_seq = htonl(resp_seq);
11725         req_out->send_reset_at_tsn = htonl(last_sent);
11726         at = 0;
11727         if (number_entries) {
11728                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11729                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11730                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11731                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11732                                 req_out->list_of_streams[at] = htons(i);
11733                                 at++;
11734                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11735                                 if (at >= number_entries) {
11736                                         break;
11737                                 }
11738                         }
11739                 }
11740         } else {
11741                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11742                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11743                 }
11744         }
11745         if (SCTP_SIZE32(len) > len) {
11746                 /*-
11747                  * Need to worry about the pad we may end up adding to the
11748                  * end. This is easy since the struct is either aligned to 4
11749                  * bytes or 2 bytes off.
11750                  */
11751                 req_out->list_of_streams[number_entries] = 0;
11752         }
11753         /* now fix the chunk length */
11754         ch->chunk_length = htons(len + old_len);
11755         chk->book_size = len + old_len;
11756         chk->book_size_scale = 0;
11757         chk->send_size = SCTP_SIZE32(chk->book_size);
11758         SCTP_BUF_LEN(chk->data) = chk->send_size;
11759         return (1);
11760 }
11761
11762 static void
11763 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11764     int number_entries, uint16_t *list,
11765     uint32_t seq)
11766 {
11767         uint16_t len, old_len, i;
11768         struct sctp_stream_reset_in_request *req_in;
11769         struct sctp_chunkhdr *ch;
11770
11771         ch = mtod(chk->data, struct sctp_chunkhdr *);
11772         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11773
11774         /* get to new offset for the param. */
11775         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11776         /* now how long will this param be? */
11777         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11778         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11779         req_in->ph.param_length = htons(len);
11780         req_in->request_seq = htonl(seq);
11781         if (number_entries) {
11782                 for (i = 0; i < number_entries; i++) {
11783                         req_in->list_of_streams[i] = htons(list[i]);
11784                 }
11785         }
11786         if (SCTP_SIZE32(len) > len) {
11787                 /*-
11788                  * Need to worry about the pad we may end up adding to the
11789                  * end. This is easy since the struct is either aligned to 4
11790                  * bytes or 2 bytes off.
11791                  */
11792                 req_in->list_of_streams[number_entries] = 0;
11793         }
11794         /* now fix the chunk length */
11795         ch->chunk_length = htons(len + old_len);
11796         chk->book_size = len + old_len;
11797         chk->book_size_scale = 0;
11798         chk->send_size = SCTP_SIZE32(chk->book_size);
11799         SCTP_BUF_LEN(chk->data) = chk->send_size;
11800         return;
11801 }
11802
11803 static void
11804 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11805     uint32_t seq)
11806 {
11807         uint16_t len, old_len;
11808         struct sctp_stream_reset_tsn_request *req_tsn;
11809         struct sctp_chunkhdr *ch;
11810
11811         ch = mtod(chk->data, struct sctp_chunkhdr *);
11812         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11813
11814         /* get to new offset for the param. */
11815         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11816         /* now how long will this param be? */
11817         len = sizeof(struct sctp_stream_reset_tsn_request);
11818         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11819         req_tsn->ph.param_length = htons(len);
11820         req_tsn->request_seq = htonl(seq);
11821
11822         /* now fix the chunk length */
11823         ch->chunk_length = htons(len + old_len);
11824         chk->send_size = len + old_len;
11825         chk->book_size = SCTP_SIZE32(chk->send_size);
11826         chk->book_size_scale = 0;
11827         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11828         return;
11829 }
11830
11831 void
11832 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11833     uint32_t resp_seq, uint32_t result)
11834 {
11835         uint16_t len, old_len;
11836         struct sctp_stream_reset_response *resp;
11837         struct sctp_chunkhdr *ch;
11838
11839         ch = mtod(chk->data, struct sctp_chunkhdr *);
11840         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11841
11842         /* get to new offset for the param. */
11843         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11844         /* now how long will this param be? */
11845         len = sizeof(struct sctp_stream_reset_response);
11846         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11847         resp->ph.param_length = htons(len);
11848         resp->response_seq = htonl(resp_seq);
11849         resp->result = ntohl(result);
11850
11851         /* now fix the chunk length */
11852         ch->chunk_length = htons(len + old_len);
11853         chk->book_size = len + old_len;
11854         chk->book_size_scale = 0;
11855         chk->send_size = SCTP_SIZE32(chk->book_size);
11856         SCTP_BUF_LEN(chk->data) = chk->send_size;
11857         return;
11858 }
11859
11860 void
11861 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11862     struct sctp_stream_reset_list *ent,
11863     int response)
11864 {
11865         struct sctp_association *asoc;
11866         struct sctp_tmit_chunk *chk;
11867         struct sctp_chunkhdr *ch;
11868
11869         asoc = &stcb->asoc;
11870
11871         /*
11872          * Reset our last reset action to the new one IP -> response
11873          * (PERFORMED probably). This assures that if we fail to send, a
11874          * retran from the peer will get the new response.
11875          */
11876         asoc->last_reset_action[0] = response;
11877         if (asoc->stream_reset_outstanding) {
11878                 return;
11879         }
11880         sctp_alloc_a_chunk(stcb, chk);
11881         if (chk == NULL) {
11882                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11883                 return;
11884         }
11885         chk->copy_by_ref = 0;
11886         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11887         chk->rec.chunk_id.can_take_data = 0;
11888         chk->flags = 0;
11889         chk->asoc = &stcb->asoc;
11890         chk->book_size = sizeof(struct sctp_chunkhdr);
11891         chk->send_size = SCTP_SIZE32(chk->book_size);
11892         chk->book_size_scale = 0;
11893         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11894         if (chk->data == NULL) {
11895                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11896                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11897                 return;
11898         }
11899         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11900         /* setup chunk parameters */
11901         chk->sent = SCTP_DATAGRAM_UNSENT;
11902         chk->snd_count = 0;
11903         if (stcb->asoc.alternate) {
11904                 chk->whoTo = stcb->asoc.alternate;
11905         } else {
11906                 chk->whoTo = stcb->asoc.primary_destination;
11907         }
11908         ch = mtod(chk->data, struct sctp_chunkhdr *);
11909         ch->chunk_type = SCTP_STREAM_RESET;
11910         ch->chunk_flags = 0;
11911         ch->chunk_length = htons(chk->book_size);
11912         atomic_add_int(&chk->whoTo->ref_count, 1);
11913         SCTP_BUF_LEN(chk->data) = chk->send_size;
11914         sctp_add_stream_reset_result(chk, ent->seq, response);
11915         /* insert the chunk for sending */
11916         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11917             chk,
11918             sctp_next);
11919         asoc->ctrl_queue_cnt++;
11920 }
11921
11922 void
11923 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11924     uint32_t resp_seq, uint32_t result,
11925     uint32_t send_una, uint32_t recv_next)
11926 {
11927         uint16_t len, old_len;
11928         struct sctp_stream_reset_response_tsn *resp;
11929         struct sctp_chunkhdr *ch;
11930
11931         ch = mtod(chk->data, struct sctp_chunkhdr *);
11932         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11933
11934         /* get to new offset for the param. */
11935         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11936         /* now how long will this param be? */
11937         len = sizeof(struct sctp_stream_reset_response_tsn);
11938         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11939         resp->ph.param_length = htons(len);
11940         resp->response_seq = htonl(resp_seq);
11941         resp->result = htonl(result);
11942         resp->senders_next_tsn = htonl(send_una);
11943         resp->receivers_next_tsn = htonl(recv_next);
11944
11945         /* now fix the chunk length */
11946         ch->chunk_length = htons(len + old_len);
11947         chk->book_size = len + old_len;
11948         chk->send_size = SCTP_SIZE32(chk->book_size);
11949         chk->book_size_scale = 0;
11950         SCTP_BUF_LEN(chk->data) = chk->send_size;
11951         return;
11952 }
11953
11954 static void
11955 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11956     uint32_t seq,
11957     uint16_t adding)
11958 {
11959         uint16_t len, old_len;
11960         struct sctp_chunkhdr *ch;
11961         struct sctp_stream_reset_add_strm *addstr;
11962
11963         ch = mtod(chk->data, struct sctp_chunkhdr *);
11964         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11965
11966         /* get to new offset for the param. */
11967         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11968         /* now how long will this param be? */
11969         len = sizeof(struct sctp_stream_reset_add_strm);
11970
11971         /* Fill it out. */
11972         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11973         addstr->ph.param_length = htons(len);
11974         addstr->request_seq = htonl(seq);
11975         addstr->number_of_streams = htons(adding);
11976         addstr->reserved = 0;
11977
11978         /* now fix the chunk length */
11979         ch->chunk_length = htons(len + old_len);
11980         chk->send_size = len + old_len;
11981         chk->book_size = SCTP_SIZE32(chk->send_size);
11982         chk->book_size_scale = 0;
11983         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11984         return;
11985 }
11986
11987 static void
11988 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11989     uint32_t seq,
11990     uint16_t adding)
11991 {
11992         uint16_t len, old_len;
11993         struct sctp_chunkhdr *ch;
11994         struct sctp_stream_reset_add_strm *addstr;
11995
11996         ch = mtod(chk->data, struct sctp_chunkhdr *);
11997         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11998
11999         /* get to new offset for the param. */
12000         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12001         /* now how long will this param be? */
12002         len = sizeof(struct sctp_stream_reset_add_strm);
12003         /* Fill it out. */
12004         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12005         addstr->ph.param_length = htons(len);
12006         addstr->request_seq = htonl(seq);
12007         addstr->number_of_streams = htons(adding);
12008         addstr->reserved = 0;
12009
12010         /* now fix the chunk length */
12011         ch->chunk_length = htons(len + old_len);
12012         chk->send_size = len + old_len;
12013         chk->book_size = SCTP_SIZE32(chk->send_size);
12014         chk->book_size_scale = 0;
12015         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12016         return;
12017 }
12018
12019 int
12020 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12021 {
12022         struct sctp_association *asoc;
12023         struct sctp_tmit_chunk *chk;
12024         struct sctp_chunkhdr *ch;
12025         uint32_t seq;
12026
12027         asoc = &stcb->asoc;
12028         asoc->trigger_reset = 0;
12029         if (asoc->stream_reset_outstanding) {
12030                 return (EALREADY);
12031         }
12032         sctp_alloc_a_chunk(stcb, chk);
12033         if (chk == NULL) {
12034                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12035                 return (ENOMEM);
12036         }
12037         chk->copy_by_ref = 0;
12038         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12039         chk->rec.chunk_id.can_take_data = 0;
12040         chk->flags = 0;
12041         chk->asoc = &stcb->asoc;
12042         chk->book_size = sizeof(struct sctp_chunkhdr);
12043         chk->send_size = SCTP_SIZE32(chk->book_size);
12044         chk->book_size_scale = 0;
12045         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12046         if (chk->data == NULL) {
12047                 sctp_free_a_chunk(stcb, chk, so_locked);
12048                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12049                 return (ENOMEM);
12050         }
12051         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12052
12053         /* setup chunk parameters */
12054         chk->sent = SCTP_DATAGRAM_UNSENT;
12055         chk->snd_count = 0;
12056         if (stcb->asoc.alternate) {
12057                 chk->whoTo = stcb->asoc.alternate;
12058         } else {
12059                 chk->whoTo = stcb->asoc.primary_destination;
12060         }
12061         ch = mtod(chk->data, struct sctp_chunkhdr *);
12062         ch->chunk_type = SCTP_STREAM_RESET;
12063         ch->chunk_flags = 0;
12064         ch->chunk_length = htons(chk->book_size);
12065         atomic_add_int(&chk->whoTo->ref_count, 1);
12066         SCTP_BUF_LEN(chk->data) = chk->send_size;
12067         seq = stcb->asoc.str_reset_seq_out;
12068         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12069                 seq++;
12070                 asoc->stream_reset_outstanding++;
12071         } else {
12072                 m_freem(chk->data);
12073                 chk->data = NULL;
12074                 sctp_free_a_chunk(stcb, chk, so_locked);
12075                 return (ENOENT);
12076         }
12077         asoc->str_reset = chk;
12078         /* insert the chunk for sending */
12079         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12080             chk,
12081             sctp_next);
12082         asoc->ctrl_queue_cnt++;
12083
12084         if (stcb->asoc.send_sack) {
12085                 sctp_send_sack(stcb, so_locked);
12086         }
12087         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12088         return (0);
12089 }
12090
12091 int
12092 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12093     uint16_t number_entries, uint16_t *list,
12094     uint8_t send_in_req,
12095     uint8_t send_tsn_req,
12096     uint8_t add_stream,
12097     uint16_t adding_o,
12098     uint16_t adding_i, uint8_t peer_asked)
12099 {
12100         struct sctp_association *asoc;
12101         struct sctp_tmit_chunk *chk;
12102         struct sctp_chunkhdr *ch;
12103         int can_send_out_req = 0;
12104         uint32_t seq;
12105
12106         asoc = &stcb->asoc;
12107         if (asoc->stream_reset_outstanding) {
12108                 /*-
12109                  * Already one pending, must get ACK back to clear the flag.
12110                  */
12111                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12112                 return (EBUSY);
12113         }
12114         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12115             (add_stream == 0)) {
12116                 /* nothing to do */
12117                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12118                 return (EINVAL);
12119         }
12120         if (send_tsn_req && send_in_req) {
12121                 /* error, can't do that */
12122                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123                 return (EINVAL);
12124         } else if (send_in_req) {
12125                 can_send_out_req = 1;
12126         }
12127         if (number_entries > (MCLBYTES -
12128             SCTP_MIN_OVERHEAD -
12129             sizeof(struct sctp_chunkhdr) -
12130             sizeof(struct sctp_stream_reset_out_request)) /
12131             sizeof(uint16_t)) {
12132                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12133                 return (ENOMEM);
12134         }
12135         sctp_alloc_a_chunk(stcb, chk);
12136         if (chk == NULL) {
12137                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12138                 return (ENOMEM);
12139         }
12140         chk->copy_by_ref = 0;
12141         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12142         chk->rec.chunk_id.can_take_data = 0;
12143         chk->flags = 0;
12144         chk->asoc = &stcb->asoc;
12145         chk->book_size = sizeof(struct sctp_chunkhdr);
12146         chk->send_size = SCTP_SIZE32(chk->book_size);
12147         chk->book_size_scale = 0;
12148
12149         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12150         if (chk->data == NULL) {
12151                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12152                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12153                 return (ENOMEM);
12154         }
12155         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12156
12157         /* setup chunk parameters */
12158         chk->sent = SCTP_DATAGRAM_UNSENT;
12159         chk->snd_count = 0;
12160         if (stcb->asoc.alternate) {
12161                 chk->whoTo = stcb->asoc.alternate;
12162         } else {
12163                 chk->whoTo = stcb->asoc.primary_destination;
12164         }
12165         atomic_add_int(&chk->whoTo->ref_count, 1);
12166         ch = mtod(chk->data, struct sctp_chunkhdr *);
12167         ch->chunk_type = SCTP_STREAM_RESET;
12168         ch->chunk_flags = 0;
12169         ch->chunk_length = htons(chk->book_size);
12170         SCTP_BUF_LEN(chk->data) = chk->send_size;
12171
12172         seq = stcb->asoc.str_reset_seq_out;
12173         if (can_send_out_req) {
12174                 int ret;
12175
12176                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12177                 if (ret) {
12178                         seq++;
12179                         asoc->stream_reset_outstanding++;
12180                 }
12181         }
12182         if ((add_stream & 1) &&
12183             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12184                 /* Need to allocate more */
12185                 struct sctp_stream_out *oldstream;
12186                 struct sctp_stream_queue_pending *sp, *nsp;
12187                 int i;
12188 #if defined(SCTP_DETAILED_STR_STATS)
12189                 int j;
12190 #endif
12191
12192                 oldstream = stcb->asoc.strmout;
12193                 /* get some more */
12194                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12195                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12196                     SCTP_M_STRMO);
12197                 if (stcb->asoc.strmout == NULL) {
12198                         uint8_t x;
12199
12200                         stcb->asoc.strmout = oldstream;
12201                         /* Turn off the bit */
12202                         x = add_stream & 0xfe;
12203                         add_stream = x;
12204                         goto skip_stuff;
12205                 }
12206                 /*
12207                  * Ok now we proceed with copying the old out stuff and
12208                  * initializing the new stuff.
12209                  */
12210                 SCTP_TCB_SEND_LOCK(stcb);
12211                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12212                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12213                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12214                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12215                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12216                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12217                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12218                         stcb->asoc.strmout[i].sid = i;
12219                         stcb->asoc.strmout[i].state = oldstream[i].state;
12220                         /* FIX ME FIX ME */
12221                         /*
12222                          * This should be a SS_COPY operation FIX ME STREAM
12223                          * SCHEDULER EXPERT
12224                          */
12225                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12226                         /* now anything on those queues? */
12227                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12228                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12229                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12230                         }
12231
12232                 }
12233                 /* now the new streams */
12234                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12235                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12236                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12237                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12238 #if defined(SCTP_DETAILED_STR_STATS)
12239                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12240                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12241                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12242                         }
12243 #else
12244                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12245                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12246 #endif
12247                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12248                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12249                         stcb->asoc.strmout[i].sid = i;
12250                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12251                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12252                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12253                 }
12254                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12255                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12256                 SCTP_TCB_SEND_UNLOCK(stcb);
12257         }
12258 skip_stuff:
12259         if ((add_stream & 1) && (adding_o > 0)) {
12260                 asoc->strm_pending_add_size = adding_o;
12261                 asoc->peer_req_out = peer_asked;
12262                 sctp_add_an_out_stream(chk, seq, adding_o);
12263                 seq++;
12264                 asoc->stream_reset_outstanding++;
12265         }
12266         if ((add_stream & 2) && (adding_i > 0)) {
12267                 sctp_add_an_in_stream(chk, seq, adding_i);
12268                 seq++;
12269                 asoc->stream_reset_outstanding++;
12270         }
12271         if (send_in_req) {
12272                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12273                 seq++;
12274                 asoc->stream_reset_outstanding++;
12275         }
12276         if (send_tsn_req) {
12277                 sctp_add_stream_reset_tsn(chk, seq);
12278                 asoc->stream_reset_outstanding++;
12279         }
12280         asoc->str_reset = chk;
12281         /* insert the chunk for sending */
12282         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12283             chk,
12284             sctp_next);
12285         asoc->ctrl_queue_cnt++;
12286         if (stcb->asoc.send_sack) {
12287                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12288         }
12289         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12290         return (0);
12291 }
12292
12293 void
12294 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12295     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12296     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12297     uint32_t vrf_id, uint16_t port)
12298 {
12299         /* Don't respond to an ABORT with an ABORT. */
12300         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12301                 if (cause)
12302                         sctp_m_freem(cause);
12303                 return;
12304         }
12305         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12306             mflowtype, mflowid, fibnum,
12307             vrf_id, port);
12308         return;
12309 }
12310
12311 void
12312 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12313     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12314     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12315     uint32_t vrf_id, uint16_t port)
12316 {
12317         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12318             mflowtype, mflowid, fibnum,
12319             vrf_id, port);
12320         return;
12321 }
12322
12323 static struct mbuf *
12324 sctp_copy_resume(struct uio *uio,
12325     int max_send_len,
12326     int user_marks_eor,
12327     int *error,
12328     uint32_t *sndout,
12329     struct mbuf **new_tail)
12330 {
12331         struct mbuf *m;
12332
12333         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12334             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12335         if (m == NULL) {
12336                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12337                 *error = ENOBUFS;
12338         } else {
12339                 *sndout = m_length(m, NULL);
12340                 *new_tail = m_last(m);
12341         }
12342         return (m);
12343 }
12344
12345 static int
12346 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12347     struct uio *uio,
12348     int resv_upfront)
12349 {
12350         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12351             resv_upfront, 0);
12352         if (sp->data == NULL) {
12353                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12354                 return (ENOBUFS);
12355         }
12356         sp->tail_mbuf = m_last(sp->data);
12357         return (0);
12358 }
12359
12360
12361
12362 static struct sctp_stream_queue_pending *
12363 sctp_copy_it_in(struct sctp_tcb *stcb,
12364     struct sctp_association *asoc,
12365     struct sctp_sndrcvinfo *srcv,
12366     struct uio *uio,
12367     struct sctp_nets *net,
12368     int max_send_len,
12369     int user_marks_eor,
12370     int *error)
12371 {
12372         /*-
12373          * This routine must be very careful in its work. Protocol
12374          * processing is up and running so care must be taken to spl...()
12375          * when you need to do something that may effect the stcb/asoc. The
12376          * sb is locked however. When data is copied the protocol processing
12377          * should be enabled since this is a slower operation...
12378          */
12379         struct sctp_stream_queue_pending *sp = NULL;
12380         int resv_in_first;
12381
12382         *error = 0;
12383         /* Now can we send this? */
12384         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12385             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12386             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12387             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12388                 /* got data while shutting down */
12389                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12390                 *error = ECONNRESET;
12391                 goto out_now;
12392         }
12393         sctp_alloc_a_strmoq(stcb, sp);
12394         if (sp == NULL) {
12395                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12396                 *error = ENOMEM;
12397                 goto out_now;
12398         }
12399         sp->act_flags = 0;
12400         sp->sender_all_done = 0;
12401         sp->sinfo_flags = srcv->sinfo_flags;
12402         sp->timetolive = srcv->sinfo_timetolive;
12403         sp->ppid = srcv->sinfo_ppid;
12404         sp->context = srcv->sinfo_context;
12405         sp->fsn = 0;
12406         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12407
12408         sp->sid = srcv->sinfo_stream;
12409         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12410         if ((sp->length == (uint32_t)uio->uio_resid) &&
12411             ((user_marks_eor == 0) ||
12412             (srcv->sinfo_flags & SCTP_EOF) ||
12413             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12414                 sp->msg_is_complete = 1;
12415         } else {
12416                 sp->msg_is_complete = 0;
12417         }
12418         sp->sender_all_done = 0;
12419         sp->some_taken = 0;
12420         sp->put_last_out = 0;
12421         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12422         sp->data = sp->tail_mbuf = NULL;
12423         if (sp->length == 0) {
12424                 *error = 0;
12425                 goto skip_copy;
12426         }
12427         if (srcv->sinfo_keynumber_valid) {
12428                 sp->auth_keyid = srcv->sinfo_keynumber;
12429         } else {
12430                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12431         }
12432         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12433                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12434                 sp->holds_key_ref = 1;
12435         }
12436         *error = sctp_copy_one(sp, uio, resv_in_first);
12437 skip_copy:
12438         if (*error) {
12439                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12440                 sp = NULL;
12441         } else {
12442                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12443                         sp->net = net;
12444                         atomic_add_int(&sp->net->ref_count, 1);
12445                 } else {
12446                         sp->net = NULL;
12447                 }
12448                 sctp_set_prsctp_policy(sp);
12449         }
12450 out_now:
12451         return (sp);
12452 }
12453
12454
12455 int
12456 sctp_sosend(struct socket *so,
12457     struct sockaddr *addr,
12458     struct uio *uio,
12459     struct mbuf *top,
12460     struct mbuf *control,
12461     int flags,
12462     struct thread *p
12463 )
12464 {
12465         int error, use_sndinfo = 0;
12466         struct sctp_sndrcvinfo sndrcvninfo;
12467         struct sockaddr *addr_to_use;
12468 #if defined(INET) && defined(INET6)
12469         struct sockaddr_in sin;
12470 #endif
12471
12472         if (control) {
12473                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12474                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12475                     sizeof(sndrcvninfo))) {
12476                         /* got one */
12477                         use_sndinfo = 1;
12478                 }
12479         }
12480         addr_to_use = addr;
12481 #if defined(INET) && defined(INET6)
12482         if ((addr) && (addr->sa_family == AF_INET6)) {
12483                 struct sockaddr_in6 *sin6;
12484
12485                 sin6 = (struct sockaddr_in6 *)addr;
12486                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12487                         in6_sin6_2_sin(&sin, sin6);
12488                         addr_to_use = (struct sockaddr *)&sin;
12489                 }
12490         }
12491 #endif
12492         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12493             control,
12494             flags,
12495             use_sndinfo ? &sndrcvninfo : NULL
12496             ,p
12497             );
12498         return (error);
12499 }
12500
12501
12502 int
12503 sctp_lower_sosend(struct socket *so,
12504     struct sockaddr *addr,
12505     struct uio *uio,
12506     struct mbuf *i_pak,
12507     struct mbuf *control,
12508     int flags,
12509     struct sctp_sndrcvinfo *srcv
12510     ,
12511     struct thread *p
12512 )
12513 {
12514         unsigned int sndlen = 0, max_len;
12515         int error, len;
12516         struct mbuf *top = NULL;
12517         int queue_only = 0, queue_only_for_init = 0;
12518         int free_cnt_applied = 0;
12519         int un_sent;
12520         int now_filled = 0;
12521         unsigned int inqueue_bytes = 0;
12522         struct sctp_block_entry be;
12523         struct sctp_inpcb *inp;
12524         struct sctp_tcb *stcb = NULL;
12525         struct timeval now;
12526         struct sctp_nets *net;
12527         struct sctp_association *asoc;
12528         struct sctp_inpcb *t_inp;
12529         int user_marks_eor;
12530         int create_lock_applied = 0;
12531         int nagle_applies = 0;
12532         int some_on_control = 0;
12533         int got_all_of_the_send = 0;
12534         int hold_tcblock = 0;
12535         int non_blocking = 0;
12536         uint32_t local_add_more, local_soresv = 0;
12537         uint16_t port;
12538         uint16_t sinfo_flags;
12539         sctp_assoc_t sinfo_assoc_id;
12540
12541         error = 0;
12542         net = NULL;
12543         stcb = NULL;
12544         asoc = NULL;
12545
12546         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12547         if (inp == NULL) {
12548                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12549                 error = EINVAL;
12550                 if (i_pak) {
12551                         SCTP_RELEASE_PKT(i_pak);
12552                 }
12553                 return (error);
12554         }
12555         if ((uio == NULL) && (i_pak == NULL)) {
12556                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12557                 return (EINVAL);
12558         }
12559         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12560         atomic_add_int(&inp->total_sends, 1);
12561         if (uio) {
12562                 if (uio->uio_resid < 0) {
12563                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12564                         return (EINVAL);
12565                 }
12566                 sndlen = (unsigned int)uio->uio_resid;
12567         } else {
12568                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12569                 sndlen = SCTP_HEADER_LEN(i_pak);
12570         }
12571         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12572             (void *)addr,
12573             sndlen);
12574         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12575             SCTP_IS_LISTENING(inp)) {
12576                 /* The listener can NOT send */
12577                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12578                 error = ENOTCONN;
12579                 goto out_unlocked;
12580         }
12581         /**
12582          * Pre-screen address, if one is given the sin-len
12583          * must be set correctly!
12584          */
12585         if (addr) {
12586                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12587
12588                 switch (raddr->sa.sa_family) {
12589 #ifdef INET
12590                 case AF_INET:
12591                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12592                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12593                                 error = EINVAL;
12594                                 goto out_unlocked;
12595                         }
12596                         port = raddr->sin.sin_port;
12597                         break;
12598 #endif
12599 #ifdef INET6
12600                 case AF_INET6:
12601                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12602                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12603                                 error = EINVAL;
12604                                 goto out_unlocked;
12605                         }
12606                         port = raddr->sin6.sin6_port;
12607                         break;
12608 #endif
12609                 default:
12610                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12611                         error = EAFNOSUPPORT;
12612                         goto out_unlocked;
12613                 }
12614         } else
12615                 port = 0;
12616
12617         if (srcv) {
12618                 sinfo_flags = srcv->sinfo_flags;
12619                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12620                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12621                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12622                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12623                         error = EINVAL;
12624                         goto out_unlocked;
12625                 }
12626                 if (srcv->sinfo_flags)
12627                         SCTP_STAT_INCR(sctps_sends_with_flags);
12628         } else {
12629                 sinfo_flags = inp->def_send.sinfo_flags;
12630                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12631         }
12632         if (sinfo_flags & SCTP_SENDALL) {
12633                 /* its a sendall */
12634                 error = sctp_sendall(inp, uio, top, srcv);
12635                 top = NULL;
12636                 goto out_unlocked;
12637         }
12638         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12639                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12640                 error = EINVAL;
12641                 goto out_unlocked;
12642         }
12643         /* now we must find the assoc */
12644         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12645             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12646                 SCTP_INP_RLOCK(inp);
12647                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12648                 if (stcb) {
12649                         SCTP_TCB_LOCK(stcb);
12650                         hold_tcblock = 1;
12651                 }
12652                 SCTP_INP_RUNLOCK(inp);
12653         } else if (sinfo_assoc_id) {
12654                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12655                 if (stcb != NULL) {
12656                         hold_tcblock = 1;
12657                 }
12658         } else if (addr) {
12659                 /*-
12660                  * Since we did not use findep we must
12661                  * increment it, and if we don't find a tcb
12662                  * decrement it.
12663                  */
12664                 SCTP_INP_WLOCK(inp);
12665                 SCTP_INP_INCR_REF(inp);
12666                 SCTP_INP_WUNLOCK(inp);
12667                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12668                 if (stcb == NULL) {
12669                         SCTP_INP_WLOCK(inp);
12670                         SCTP_INP_DECR_REF(inp);
12671                         SCTP_INP_WUNLOCK(inp);
12672                 } else {
12673                         hold_tcblock = 1;
12674                 }
12675         }
12676         if ((stcb == NULL) && (addr)) {
12677                 /* Possible implicit send? */
12678                 SCTP_ASOC_CREATE_LOCK(inp);
12679                 create_lock_applied = 1;
12680                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12681                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12682                         /* Should I really unlock ? */
12683                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12684                         error = EINVAL;
12685                         goto out_unlocked;
12686
12687                 }
12688                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12689                     (addr->sa_family == AF_INET6)) {
12690                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12691                         error = EINVAL;
12692                         goto out_unlocked;
12693                 }
12694                 SCTP_INP_WLOCK(inp);
12695                 SCTP_INP_INCR_REF(inp);
12696                 SCTP_INP_WUNLOCK(inp);
12697                 /* With the lock applied look again */
12698                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12699                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12700                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12701                 }
12702                 if (stcb == NULL) {
12703                         SCTP_INP_WLOCK(inp);
12704                         SCTP_INP_DECR_REF(inp);
12705                         SCTP_INP_WUNLOCK(inp);
12706                 } else {
12707                         hold_tcblock = 1;
12708                 }
12709                 if (error) {
12710                         goto out_unlocked;
12711                 }
12712                 if (t_inp != inp) {
12713                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12714                         error = ENOTCONN;
12715                         goto out_unlocked;
12716                 }
12717         }
12718         if (stcb == NULL) {
12719                 if (addr == NULL) {
12720                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12721                         error = ENOENT;
12722                         goto out_unlocked;
12723                 } else {
12724                         /* We must go ahead and start the INIT process */
12725                         uint32_t vrf_id;
12726
12727                         if ((sinfo_flags & SCTP_ABORT) ||
12728                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12729                                 /*-
12730                                  * User asks to abort a non-existant assoc,
12731                                  * or EOF a non-existant assoc with no data
12732                                  */
12733                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12734                                 error = ENOENT;
12735                                 goto out_unlocked;
12736                         }
12737                         /* get an asoc/stcb struct */
12738                         vrf_id = inp->def_vrf_id;
12739 #ifdef INVARIANTS
12740                         if (create_lock_applied == 0) {
12741                                 panic("Error, should hold create lock and I don't?");
12742                         }
12743 #endif
12744                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12745                             inp->sctp_ep.pre_open_stream_count,
12746                             inp->sctp_ep.port,
12747                             p);
12748                         if (stcb == NULL) {
12749                                 /* Error is setup for us in the call */
12750                                 goto out_unlocked;
12751                         }
12752                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12753                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12754                                 /*
12755                                  * Set the connected flag so we can queue
12756                                  * data
12757                                  */
12758                                 soisconnecting(so);
12759                         }
12760                         hold_tcblock = 1;
12761                         if (create_lock_applied) {
12762                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12763                                 create_lock_applied = 0;
12764                         } else {
12765                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12766                         }
12767                         /*
12768                          * Turn on queue only flag to prevent data from
12769                          * being sent
12770                          */
12771                         queue_only = 1;
12772                         asoc = &stcb->asoc;
12773                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12774                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12775
12776                         /* initialize authentication params for the assoc */
12777                         sctp_initialize_auth_params(inp, stcb);
12778
12779                         if (control) {
12780                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12781                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12782                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12783                                         hold_tcblock = 0;
12784                                         stcb = NULL;
12785                                         goto out_unlocked;
12786                                 }
12787                         }
12788                         /* out with the INIT */
12789                         queue_only_for_init = 1;
12790                         /*-
12791                          * we may want to dig in after this call and adjust the MTU
12792                          * value. It defaulted to 1500 (constant) but the ro
12793                          * structure may now have an update and thus we may need to
12794                          * change it BEFORE we append the message.
12795                          */
12796                 }
12797         } else
12798                 asoc = &stcb->asoc;
12799         if (srcv == NULL)
12800                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12801         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12802                 if (addr)
12803                         net = sctp_findnet(stcb, addr);
12804                 else
12805                         net = NULL;
12806                 if ((net == NULL) ||
12807                     ((port != 0) && (port != stcb->rport))) {
12808                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12809                         error = EINVAL;
12810                         goto out_unlocked;
12811                 }
12812         } else {
12813                 if (stcb->asoc.alternate) {
12814                         net = stcb->asoc.alternate;
12815                 } else {
12816                         net = stcb->asoc.primary_destination;
12817                 }
12818         }
12819         atomic_add_int(&stcb->total_sends, 1);
12820         /* Keep the stcb from being freed under our feet */
12821         atomic_add_int(&asoc->refcnt, 1);
12822         free_cnt_applied = 1;
12823
12824         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12825                 if (sndlen > asoc->smallest_mtu) {
12826                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12827                         error = EMSGSIZE;
12828                         goto out_unlocked;
12829                 }
12830         }
12831         if (SCTP_SO_IS_NBIO(so)
12832             || (flags & MSG_NBIO)
12833             ) {
12834                 non_blocking = 1;
12835         }
12836         /* would we block? */
12837         if (non_blocking) {
12838                 uint32_t amount;
12839
12840                 if (hold_tcblock == 0) {
12841                         SCTP_TCB_LOCK(stcb);
12842                         hold_tcblock = 1;
12843                 }
12844                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12845                 if (user_marks_eor == 0) {
12846                         amount = sndlen;
12847                 } else {
12848                         amount = 1;
12849                 }
12850                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12851                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12852                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12853                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12854                                 error = EMSGSIZE;
12855                         else
12856                                 error = EWOULDBLOCK;
12857                         goto out_unlocked;
12858                 }
12859                 stcb->asoc.sb_send_resv += sndlen;
12860                 SCTP_TCB_UNLOCK(stcb);
12861                 hold_tcblock = 0;
12862         } else {
12863                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12864         }
12865         local_soresv = sndlen;
12866         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12867                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12868                 error = ECONNRESET;
12869                 goto out_unlocked;
12870         }
12871         if (create_lock_applied) {
12872                 SCTP_ASOC_CREATE_UNLOCK(inp);
12873                 create_lock_applied = 0;
12874         }
12875         /* Is the stream no. valid? */
12876         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12877                 /* Invalid stream number */
12878                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12879                 error = EINVAL;
12880                 goto out_unlocked;
12881         }
12882         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12883             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12884                 /*
12885                  * Can't queue any data while stream reset is underway.
12886                  */
12887                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12888                         error = EAGAIN;
12889                 } else {
12890                         error = EINVAL;
12891                 }
12892                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12893                 goto out_unlocked;
12894         }
12895         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12896             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12897                 queue_only = 1;
12898         }
12899         /* we are now done with all control */
12900         if (control) {
12901                 sctp_m_freem(control);
12902                 control = NULL;
12903         }
12904         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12905             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12906             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12907             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12908                 if (srcv->sinfo_flags & SCTP_ABORT) {
12909                         ;
12910                 } else {
12911                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12912                         error = ECONNRESET;
12913                         goto out_unlocked;
12914                 }
12915         }
12916         /* Ok, we will attempt a msgsnd :> */
12917         if (p) {
12918                 p->td_ru.ru_msgsnd++;
12919         }
12920         /* Are we aborting? */
12921         if (srcv->sinfo_flags & SCTP_ABORT) {
12922                 struct mbuf *mm;
12923                 int tot_demand, tot_out = 0, max_out;
12924
12925                 SCTP_STAT_INCR(sctps_sends_with_abort);
12926                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12927                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12928                         /* It has to be up before we abort */
12929                         /* how big is the user initiated abort? */
12930                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12931                         error = EINVAL;
12932                         goto out;
12933                 }
12934                 if (hold_tcblock) {
12935                         SCTP_TCB_UNLOCK(stcb);
12936                         hold_tcblock = 0;
12937                 }
12938                 if (top) {
12939                         struct mbuf *cntm = NULL;
12940
12941                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12942                         if (sndlen != 0) {
12943                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12944                                         tot_out += SCTP_BUF_LEN(cntm);
12945                                 }
12946                         }
12947                 } else {
12948                         /* Must fit in a MTU */
12949                         tot_out = sndlen;
12950                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12951                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12952                                 /* To big */
12953                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12954                                 error = EMSGSIZE;
12955                                 goto out;
12956                         }
12957                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12958                 }
12959                 if (mm == NULL) {
12960                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12961                         error = ENOMEM;
12962                         goto out;
12963                 }
12964                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12965                 max_out -= sizeof(struct sctp_abort_msg);
12966                 if (tot_out > max_out) {
12967                         tot_out = max_out;
12968                 }
12969                 if (mm) {
12970                         struct sctp_paramhdr *ph;
12971
12972                         /* now move forward the data pointer */
12973                         ph = mtod(mm, struct sctp_paramhdr *);
12974                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12975                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12976                         ph++;
12977                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12978                         if (top == NULL) {
12979                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12980                                 if (error) {
12981                                         /*-
12982                                          * Here if we can't get his data we
12983                                          * still abort we just don't get to
12984                                          * send the users note :-0
12985                                          */
12986                                         sctp_m_freem(mm);
12987                                         mm = NULL;
12988                                 }
12989                         } else {
12990                                 if (sndlen != 0) {
12991                                         SCTP_BUF_NEXT(mm) = top;
12992                                 }
12993                         }
12994                 }
12995                 if (hold_tcblock == 0) {
12996                         SCTP_TCB_LOCK(stcb);
12997                 }
12998                 atomic_add_int(&stcb->asoc.refcnt, -1);
12999                 free_cnt_applied = 0;
13000                 /* release this lock, otherwise we hang on ourselves */
13001                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13002                 /* now relock the stcb so everything is sane */
13003                 hold_tcblock = 0;
13004                 stcb = NULL;
13005                 /*
13006                  * In this case top is already chained to mm avoid double
13007                  * free, since we free it below if top != NULL and driver
13008                  * would free it after sending the packet out
13009                  */
13010                 if (sndlen != 0) {
13011                         top = NULL;
13012                 }
13013                 goto out_unlocked;
13014         }
13015         /* Calculate the maximum we can send */
13016         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13017         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13018                 if (non_blocking) {
13019                         /* we already checked for non-blocking above. */
13020                         max_len = sndlen;
13021                 } else {
13022                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13023                 }
13024         } else {
13025                 max_len = 0;
13026         }
13027         if (hold_tcblock) {
13028                 SCTP_TCB_UNLOCK(stcb);
13029                 hold_tcblock = 0;
13030         }
13031         if (asoc->strmout == NULL) {
13032                 /* huh? software error */
13033                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13034                 error = EFAULT;
13035                 goto out_unlocked;
13036         }
13037         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13038         if ((user_marks_eor == 0) &&
13039             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13040                 /* It will NEVER fit */
13041                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13042                 error = EMSGSIZE;
13043                 goto out_unlocked;
13044         }
13045         if ((uio == NULL) && user_marks_eor) {
13046                 /*-
13047                  * We do not support eeor mode for
13048                  * sending with mbuf chains (like sendfile).
13049                  */
13050                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13051                 error = EINVAL;
13052                 goto out_unlocked;
13053         }
13054         if (user_marks_eor) {
13055                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13056         } else {
13057                 /*-
13058                  * For non-eeor the whole message must fit in
13059                  * the socket send buffer.
13060                  */
13061                 local_add_more = sndlen;
13062         }
13063         len = 0;
13064         if (non_blocking) {
13065                 goto skip_preblock;
13066         }
13067         if (((max_len <= local_add_more) &&
13068             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13069             (max_len == 0) ||
13070             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13071                 /* No room right now ! */
13072                 SOCKBUF_LOCK(&so->so_snd);
13073                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13074                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13075                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13076                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13077                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13078                             inqueue_bytes,
13079                             local_add_more,
13080                             stcb->asoc.stream_queue_cnt,
13081                             stcb->asoc.chunks_on_out_queue,
13082                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13083                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13084                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13085                         }
13086                         be.error = 0;
13087                         stcb->block_entry = &be;
13088                         error = sbwait(&so->so_snd);
13089                         stcb->block_entry = NULL;
13090                         if (error || so->so_error || be.error) {
13091                                 if (error == 0) {
13092                                         if (so->so_error)
13093                                                 error = so->so_error;
13094                                         if (be.error) {
13095                                                 error = be.error;
13096                                         }
13097                                 }
13098                                 SOCKBUF_UNLOCK(&so->so_snd);
13099                                 goto out_unlocked;
13100                         }
13101                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13102                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13103                                     asoc, stcb->asoc.total_output_queue_size);
13104                         }
13105                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13106                                 SOCKBUF_UNLOCK(&so->so_snd);
13107                                 goto out_unlocked;
13108                         }
13109                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13110                 }
13111                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13112                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13113                 } else {
13114                         max_len = 0;
13115                 }
13116                 SOCKBUF_UNLOCK(&so->so_snd);
13117         }
13118 skip_preblock:
13119         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13120                 goto out_unlocked;
13121         }
13122         /*
13123          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13124          * case NOTE: uio will be null when top/mbuf is passed
13125          */
13126         if (sndlen == 0) {
13127                 if (srcv->sinfo_flags & SCTP_EOF) {
13128                         got_all_of_the_send = 1;
13129                         goto dataless_eof;
13130                 } else {
13131                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13132                         error = EINVAL;
13133                         goto out;
13134                 }
13135         }
13136         if (top == NULL) {
13137                 struct sctp_stream_queue_pending *sp;
13138                 struct sctp_stream_out *strm;
13139                 uint32_t sndout;
13140
13141                 SCTP_TCB_SEND_LOCK(stcb);
13142                 if ((asoc->stream_locked) &&
13143                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13144                         SCTP_TCB_SEND_UNLOCK(stcb);
13145                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13146                         error = EINVAL;
13147                         goto out;
13148                 }
13149                 SCTP_TCB_SEND_UNLOCK(stcb);
13150
13151                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13152                 if (strm->last_msg_incomplete == 0) {
13153         do_a_copy_in:
13154                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13155                         if ((sp == NULL) || (error)) {
13156                                 goto out;
13157                         }
13158                         SCTP_TCB_SEND_LOCK(stcb);
13159                         if (sp->msg_is_complete) {
13160                                 strm->last_msg_incomplete = 0;
13161                                 asoc->stream_locked = 0;
13162                         } else {
13163                                 /*
13164                                  * Just got locked to this guy in case of an
13165                                  * interrupt.
13166                                  */
13167                                 strm->last_msg_incomplete = 1;
13168                                 if (stcb->asoc.idata_supported == 0) {
13169                                         asoc->stream_locked = 1;
13170                                         asoc->stream_locked_on = srcv->sinfo_stream;
13171                                 }
13172                                 sp->sender_all_done = 0;
13173                         }
13174                         sctp_snd_sb_alloc(stcb, sp->length);
13175                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13176                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13177                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13178                         }
13179                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13180                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13181                         SCTP_TCB_SEND_UNLOCK(stcb);
13182                 } else {
13183                         SCTP_TCB_SEND_LOCK(stcb);
13184                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13185                         SCTP_TCB_SEND_UNLOCK(stcb);
13186                         if (sp == NULL) {
13187                                 /* ???? Huh ??? last msg is gone */
13188 #ifdef INVARIANTS
13189                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13190 #else
13191                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13192                                 strm->last_msg_incomplete = 0;
13193 #endif
13194                                 goto do_a_copy_in;
13195
13196                         }
13197                 }
13198                 while (uio->uio_resid > 0) {
13199                         /* How much room do we have? */
13200                         struct mbuf *new_tail, *mm;
13201
13202                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13203                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13204                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13205                         else
13206                                 max_len = 0;
13207
13208                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13209                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13210                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13211                                 sndout = 0;
13212                                 new_tail = NULL;
13213                                 if (hold_tcblock) {
13214                                         SCTP_TCB_UNLOCK(stcb);
13215                                         hold_tcblock = 0;
13216                                 }
13217                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13218                                 if ((mm == NULL) || error) {
13219                                         if (mm) {
13220                                                 sctp_m_freem(mm);
13221                                         }
13222                                         goto out;
13223                                 }
13224                                 /* Update the mbuf and count */
13225                                 SCTP_TCB_SEND_LOCK(stcb);
13226                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13227                                         /*
13228                                          * we need to get out. Peer probably
13229                                          * aborted.
13230                                          */
13231                                         sctp_m_freem(mm);
13232                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13233                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13234                                                 error = ECONNRESET;
13235                                         }
13236                                         SCTP_TCB_SEND_UNLOCK(stcb);
13237                                         goto out;
13238                                 }
13239                                 if (sp->tail_mbuf) {
13240                                         /* tack it to the end */
13241                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13242                                         sp->tail_mbuf = new_tail;
13243                                 } else {
13244                                         /* A stolen mbuf */
13245                                         sp->data = mm;
13246                                         sp->tail_mbuf = new_tail;
13247                                 }
13248                                 sctp_snd_sb_alloc(stcb, sndout);
13249                                 atomic_add_int(&sp->length, sndout);
13250                                 len += sndout;
13251                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13252                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13253                                 }
13254                                 /* Did we reach EOR? */
13255                                 if ((uio->uio_resid == 0) &&
13256                                     ((user_marks_eor == 0) ||
13257                                     (srcv->sinfo_flags & SCTP_EOF) ||
13258                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13259                                         sp->msg_is_complete = 1;
13260                                 } else {
13261                                         sp->msg_is_complete = 0;
13262                                 }
13263                                 SCTP_TCB_SEND_UNLOCK(stcb);
13264                         }
13265                         if (uio->uio_resid == 0) {
13266                                 /* got it all? */
13267                                 continue;
13268                         }
13269                         /* PR-SCTP? */
13270                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13271                                 /*
13272                                  * This is ugly but we must assure locking
13273                                  * order
13274                                  */
13275                                 if (hold_tcblock == 0) {
13276                                         SCTP_TCB_LOCK(stcb);
13277                                         hold_tcblock = 1;
13278                                 }
13279                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13280                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13281                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13282                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13283                                 else
13284                                         max_len = 0;
13285                                 if (max_len > 0) {
13286                                         continue;
13287                                 }
13288                                 SCTP_TCB_UNLOCK(stcb);
13289                                 hold_tcblock = 0;
13290                         }
13291                         /* wait for space now */
13292                         if (non_blocking) {
13293                                 /* Non-blocking io in place out */
13294                                 goto skip_out_eof;
13295                         }
13296                         /* What about the INIT, send it maybe */
13297                         if (queue_only_for_init) {
13298                                 if (hold_tcblock == 0) {
13299                                         SCTP_TCB_LOCK(stcb);
13300                                         hold_tcblock = 1;
13301                                 }
13302                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13303                                         /* a collision took us forward? */
13304                                         queue_only = 0;
13305                                 } else {
13306                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13307                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13308                                         queue_only = 1;
13309                                 }
13310                         }
13311                         if ((net->flight_size > net->cwnd) &&
13312                             (asoc->sctp_cmt_on_off == 0)) {
13313                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13314                                 queue_only = 1;
13315                         } else if (asoc->ifp_had_enobuf) {
13316                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13317                                 if (net->flight_size > (2 * net->mtu)) {
13318                                         queue_only = 1;
13319                                 }
13320                                 asoc->ifp_had_enobuf = 0;
13321                         }
13322                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13323                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13324                             (stcb->asoc.total_flight > 0) &&
13325                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13326                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13327
13328                                 /*-
13329                                  * Ok, Nagle is set on and we have data outstanding.
13330                                  * Don't send anything and let SACKs drive out the
13331                                  * data unless we have a "full" segment to send.
13332                                  */
13333                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13334                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13335                                 }
13336                                 SCTP_STAT_INCR(sctps_naglequeued);
13337                                 nagle_applies = 1;
13338                         } else {
13339                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13340                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13341                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13342                                 }
13343                                 SCTP_STAT_INCR(sctps_naglesent);
13344                                 nagle_applies = 0;
13345                         }
13346                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13347
13348                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13349                                     nagle_applies, un_sent);
13350                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13351                                     stcb->asoc.total_flight,
13352                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13353                         }
13354                         if (queue_only_for_init)
13355                                 queue_only_for_init = 0;
13356                         if ((queue_only == 0) && (nagle_applies == 0)) {
13357                                 /*-
13358                                  * need to start chunk output
13359                                  * before blocking.. note that if
13360                                  * a lock is already applied, then
13361                                  * the input via the net is happening
13362                                  * and I don't need to start output :-D
13363                                  */
13364                                 if (hold_tcblock == 0) {
13365                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13366                                                 hold_tcblock = 1;
13367                                                 sctp_chunk_output(inp,
13368                                                     stcb,
13369                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13370                                         }
13371                                 } else {
13372                                         sctp_chunk_output(inp,
13373                                             stcb,
13374                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13375                                 }
13376                                 if (hold_tcblock == 1) {
13377                                         SCTP_TCB_UNLOCK(stcb);
13378                                         hold_tcblock = 0;
13379                                 }
13380                         }
13381                         SOCKBUF_LOCK(&so->so_snd);
13382                         /*-
13383                          * This is a bit strange, but I think it will
13384                          * work. The total_output_queue_size is locked and
13385                          * protected by the TCB_LOCK, which we just released.
13386                          * There is a race that can occur between releasing it
13387                          * above, and me getting the socket lock, where sacks
13388                          * come in but we have not put the SB_WAIT on the
13389                          * so_snd buffer to get the wakeup. After the LOCK
13390                          * is applied the sack_processing will also need to
13391                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13392                          * once we have the socket buffer lock if we recheck the
13393                          * size we KNOW we will get to sleep safely with the
13394                          * wakeup flag in place.
13395                          */
13396                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13397                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13398                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13399                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13400                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13401                                             asoc, (size_t)uio->uio_resid);
13402                                 }
13403                                 be.error = 0;
13404                                 stcb->block_entry = &be;
13405                                 error = sbwait(&so->so_snd);
13406                                 stcb->block_entry = NULL;
13407
13408                                 if (error || so->so_error || be.error) {
13409                                         if (error == 0) {
13410                                                 if (so->so_error)
13411                                                         error = so->so_error;
13412                                                 if (be.error) {
13413                                                         error = be.error;
13414                                                 }
13415                                         }
13416                                         SOCKBUF_UNLOCK(&so->so_snd);
13417                                         goto out_unlocked;
13418                                 }
13419                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13420                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13421                                             asoc, stcb->asoc.total_output_queue_size);
13422                                 }
13423                         }
13424                         SOCKBUF_UNLOCK(&so->so_snd);
13425                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13426                                 goto out_unlocked;
13427                         }
13428                 }
13429                 SCTP_TCB_SEND_LOCK(stcb);
13430                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13431                         SCTP_TCB_SEND_UNLOCK(stcb);
13432                         goto out_unlocked;
13433                 }
13434                 if (sp) {
13435                         if (sp->msg_is_complete == 0) {
13436                                 strm->last_msg_incomplete = 1;
13437                                 if (stcb->asoc.idata_supported == 0) {
13438                                         asoc->stream_locked = 1;
13439                                         asoc->stream_locked_on = srcv->sinfo_stream;
13440                                 }
13441                         } else {
13442                                 sp->sender_all_done = 1;
13443                                 strm->last_msg_incomplete = 0;
13444                                 asoc->stream_locked = 0;
13445                         }
13446                 } else {
13447                         SCTP_PRINTF("Huh no sp TSNH?\n");
13448                         strm->last_msg_incomplete = 0;
13449                         asoc->stream_locked = 0;
13450                 }
13451                 SCTP_TCB_SEND_UNLOCK(stcb);
13452                 if (uio->uio_resid == 0) {
13453                         got_all_of_the_send = 1;
13454                 }
13455         } else {
13456                 /* We send in a 0, since we do NOT have any locks */
13457                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13458                 top = NULL;
13459                 if (srcv->sinfo_flags & SCTP_EOF) {
13460                         /*
13461                          * This should only happen for Panda for the mbuf
13462                          * send case, which does NOT yet support EEOR mode.
13463                          * Thus, we can just set this flag to do the proper
13464                          * EOF handling.
13465                          */
13466                         got_all_of_the_send = 1;
13467                 }
13468         }
13469         if (error) {
13470                 goto out;
13471         }
13472 dataless_eof:
13473         /* EOF thing ? */
13474         if ((srcv->sinfo_flags & SCTP_EOF) &&
13475             (got_all_of_the_send == 1)) {
13476                 SCTP_STAT_INCR(sctps_sends_with_eof);
13477                 error = 0;
13478                 if (hold_tcblock == 0) {
13479                         SCTP_TCB_LOCK(stcb);
13480                         hold_tcblock = 1;
13481                 }
13482                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13483                     TAILQ_EMPTY(&asoc->sent_queue) &&
13484                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13485                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13486                                 goto abort_anyway;
13487                         }
13488                         /* there is nothing queued to send, so I'm done... */
13489                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13490                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13491                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13492                                 struct sctp_nets *netp;
13493
13494                                 /* only send SHUTDOWN the first time through */
13495                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13496                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13497                                 }
13498                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13499                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13500                                 sctp_stop_timers_for_shutdown(stcb);
13501                                 if (stcb->asoc.alternate) {
13502                                         netp = stcb->asoc.alternate;
13503                                 } else {
13504                                         netp = stcb->asoc.primary_destination;
13505                                 }
13506                                 sctp_send_shutdown(stcb, netp);
13507                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13508                                     netp);
13509                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13510                                     asoc->primary_destination);
13511                         }
13512                 } else {
13513                         /*-
13514                          * we still got (or just got) data to send, so set
13515                          * SHUTDOWN_PENDING
13516                          */
13517                         /*-
13518                          * XXX sockets draft says that SCTP_EOF should be
13519                          * sent with no data.  currently, we will allow user
13520                          * data to be sent first and move to
13521                          * SHUTDOWN-PENDING
13522                          */
13523                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13524                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13525                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13526                                 if (hold_tcblock == 0) {
13527                                         SCTP_TCB_LOCK(stcb);
13528                                         hold_tcblock = 1;
13529                                 }
13530                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13531                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13532                                 }
13533                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13534                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13535                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13536                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13537                                         struct mbuf *op_err;
13538                                         char msg[SCTP_DIAG_INFO_LEN];
13539
13540                         abort_anyway:
13541                                         if (free_cnt_applied) {
13542                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13543                                                 free_cnt_applied = 0;
13544                                         }
13545                                         snprintf(msg, sizeof(msg),
13546                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13547                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13548                                             msg);
13549                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13550                                             op_err, SCTP_SO_LOCKED);
13551                                         /*
13552                                          * now relock the stcb so everything
13553                                          * is sane
13554                                          */
13555                                         hold_tcblock = 0;
13556                                         stcb = NULL;
13557                                         goto out;
13558                                 }
13559                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13560                                     asoc->primary_destination);
13561                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13562                         }
13563                 }
13564         }
13565 skip_out_eof:
13566         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13567                 some_on_control = 1;
13568         }
13569         if (queue_only_for_init) {
13570                 if (hold_tcblock == 0) {
13571                         SCTP_TCB_LOCK(stcb);
13572                         hold_tcblock = 1;
13573                 }
13574                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13575                         /* a collision took us forward? */
13576                         queue_only = 0;
13577                 } else {
13578                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13579                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13580                         queue_only = 1;
13581                 }
13582         }
13583         if ((net->flight_size > net->cwnd) &&
13584             (stcb->asoc.sctp_cmt_on_off == 0)) {
13585                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13586                 queue_only = 1;
13587         } else if (asoc->ifp_had_enobuf) {
13588                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13589                 if (net->flight_size > (2 * net->mtu)) {
13590                         queue_only = 1;
13591                 }
13592                 asoc->ifp_had_enobuf = 0;
13593         }
13594         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13595         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13596             (stcb->asoc.total_flight > 0) &&
13597             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13598             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13599                 /*-
13600                  * Ok, Nagle is set on and we have data outstanding.
13601                  * Don't send anything and let SACKs drive out the
13602                  * data unless wen have a "full" segment to send.
13603                  */
13604                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13605                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13606                 }
13607                 SCTP_STAT_INCR(sctps_naglequeued);
13608                 nagle_applies = 1;
13609         } else {
13610                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13611                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13612                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13613                 }
13614                 SCTP_STAT_INCR(sctps_naglesent);
13615                 nagle_applies = 0;
13616         }
13617         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13618                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13619                     nagle_applies, un_sent);
13620                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13621                     stcb->asoc.total_flight,
13622                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13623         }
13624         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13625                 /* we can attempt to send too. */
13626                 if (hold_tcblock == 0) {
13627                         /*
13628                          * If there is activity recv'ing sacks no need to
13629                          * send
13630                          */
13631                         if (SCTP_TCB_TRYLOCK(stcb)) {
13632                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13633                                 hold_tcblock = 1;
13634                         }
13635                 } else {
13636                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13637                 }
13638         } else if ((queue_only == 0) &&
13639                     (stcb->asoc.peers_rwnd == 0) &&
13640             (stcb->asoc.total_flight == 0)) {
13641                 /* We get to have a probe outstanding */
13642                 if (hold_tcblock == 0) {
13643                         hold_tcblock = 1;
13644                         SCTP_TCB_LOCK(stcb);
13645                 }
13646                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13647         } else if (some_on_control) {
13648                 int num_out, reason, frag_point;
13649
13650                 /* Here we do control only */
13651                 if (hold_tcblock == 0) {
13652                         hold_tcblock = 1;
13653                         SCTP_TCB_LOCK(stcb);
13654                 }
13655                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13656                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13657                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13658         }
13659         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13660             queue_only, stcb->asoc.peers_rwnd, un_sent,
13661             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13662             stcb->asoc.total_output_queue_size, error);
13663
13664 out:
13665 out_unlocked:
13666
13667         if (local_soresv && stcb) {
13668                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13669         }
13670         if (create_lock_applied) {
13671                 SCTP_ASOC_CREATE_UNLOCK(inp);
13672         }
13673         if ((stcb) && hold_tcblock) {
13674                 SCTP_TCB_UNLOCK(stcb);
13675         }
13676         if (stcb && free_cnt_applied) {
13677                 atomic_add_int(&stcb->asoc.refcnt, -1);
13678         }
13679 #ifdef INVARIANTS
13680         if (stcb) {
13681                 if (mtx_owned(&stcb->tcb_mtx)) {
13682                         panic("Leaving with tcb mtx owned?");
13683                 }
13684                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13685                         panic("Leaving with tcb send mtx owned?");
13686                 }
13687         }
13688 #endif
13689         if (top) {
13690                 sctp_m_freem(top);
13691         }
13692         if (control) {
13693                 sctp_m_freem(control);
13694         }
13695         return (error);
13696 }
13697
13698
13699 /*
13700  * generate an AUTHentication chunk, if required
13701  */
13702 struct mbuf *
13703 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13704     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13705     struct sctp_tcb *stcb, uint8_t chunk)
13706 {
13707         struct mbuf *m_auth;
13708         struct sctp_auth_chunk *auth;
13709         int chunk_len;
13710         struct mbuf *cn;
13711
13712         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13713             (stcb == NULL))
13714                 return (m);
13715
13716         if (stcb->asoc.auth_supported == 0) {
13717                 return (m);
13718         }
13719         /* does the requested chunk require auth? */
13720         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13721                 return (m);
13722         }
13723         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13724         if (m_auth == NULL) {
13725                 /* no mbuf's */
13726                 return (m);
13727         }
13728         /* reserve some space if this will be the first mbuf */
13729         if (m == NULL)
13730                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13731         /* fill in the AUTH chunk details */
13732         auth = mtod(m_auth, struct sctp_auth_chunk *);
13733         memset(auth, 0, sizeof(*auth));
13734         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13735         auth->ch.chunk_flags = 0;
13736         chunk_len = sizeof(*auth) +
13737             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13738         auth->ch.chunk_length = htons(chunk_len);
13739         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13740         /* key id and hmac digest will be computed and filled in upon send */
13741
13742         /* save the offset where the auth was inserted into the chain */
13743         *offset = 0;
13744         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13745                 *offset += SCTP_BUF_LEN(cn);
13746         }
13747
13748         /* update length and return pointer to the auth chunk */
13749         SCTP_BUF_LEN(m_auth) = chunk_len;
13750         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13751         if (auth_ret != NULL)
13752                 *auth_ret = auth;
13753
13754         return (m);
13755 }
13756
13757 #ifdef INET6
13758 int
13759 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13760 {
13761         struct nd_prefix *pfx = NULL;
13762         struct nd_pfxrouter *pfxrtr = NULL;
13763         struct sockaddr_in6 gw6;
13764
13765         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13766                 return (0);
13767
13768         /* get prefix entry of address */
13769         ND6_RLOCK();
13770         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13771                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13772                         continue;
13773                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13774                     &src6->sin6_addr, &pfx->ndpr_mask))
13775                         break;
13776         }
13777         /* no prefix entry in the prefix list */
13778         if (pfx == NULL) {
13779                 ND6_RUNLOCK();
13780                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13781                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13782                 return (0);
13783         }
13784         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13785         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13786
13787         /* search installed gateway from prefix entry */
13788         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13789                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13790                 gw6.sin6_family = AF_INET6;
13791                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13792                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13793                     sizeof(struct in6_addr));
13794                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13795                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13796                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13797                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13798                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13799                         ND6_RUNLOCK();
13800                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13801                         return (1);
13802                 }
13803         }
13804         ND6_RUNLOCK();
13805         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13806         return (0);
13807 }
13808 #endif
13809
13810 int
13811 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13812 {
13813 #ifdef INET
13814         struct sockaddr_in *sin, *mask;
13815         struct ifaddr *ifa;
13816         struct in_addr srcnetaddr, gwnetaddr;
13817
13818         if (ro == NULL || ro->ro_rt == NULL ||
13819             sifa->address.sa.sa_family != AF_INET) {
13820                 return (0);
13821         }
13822         ifa = (struct ifaddr *)sifa->ifa;
13823         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13824         sin = &sifa->address.sin;
13825         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13826         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13827         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13828         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13829
13830         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13831         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13832         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13833         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13834         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13835         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13836                 return (1);
13837         }
13838 #endif
13839         return (0);
13840 }