sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, 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 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <sys/proc.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet/sctp_sysctl.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctputil.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_indata.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/udp.h>
  56 #include <netinet/udp_var.h>
  57 #include <machine/in_cksum.h>
  58
  59
  60
  61 #define SCTP_MAX_GAPS_INARRAY 4
  62 struct sack_track {
  63         uint8_t right_edge;     /* mergable on the right edge */
  64         uint8_t left_edge;      /* mergable on the left edge */
  65         uint8_t num_entries;
  66         uint8_t spare;
  67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  68 };
  69
  70 struct sack_track sack_array[256] = {
  71         {0, 0, 0, 0,            /* 0x00 */
  72                 {{0, 0},
  73                 {0, 0},
  74                 {0, 0},
  75                 {0, 0}
  76                 }
  77         },
  78         {1, 0, 1, 0,            /* 0x01 */
  79                 {{0, 0},
  80                 {0, 0},
  81                 {0, 0},
  82                 {0, 0}
  83                 }
  84         },
  85         {0, 0, 1, 0,            /* 0x02 */
  86                 {{1, 1},
  87                 {0, 0},
  88                 {0, 0},
  89                 {0, 0}
  90                 }
  91         },
  92         {1, 0, 1, 0,            /* 0x03 */
  93                 {{0, 1},
  94                 {0, 0},
  95                 {0, 0},
  96                 {0, 0}
  97                 }
  98         },
  99         {0, 0, 1, 0,            /* 0x04 */
 100                 {{2, 2},
 101                 {0, 0},
 102                 {0, 0},
 103                 {0, 0}
 104                 }
 105         },
 106         {1, 0, 2, 0,            /* 0x05 */
 107                 {{0, 0},
 108                 {2, 2},
 109                 {0, 0},
 110                 {0, 0}
 111                 }
 112         },
 113         {0, 0, 1, 0,            /* 0x06 */
 114                 {{1, 2},
 115                 {0, 0},
 116                 {0, 0},
 117                 {0, 0}
 118                 }
 119         },
 120         {1, 0, 1, 0,            /* 0x07 */
 121                 {{0, 2},
 122                 {0, 0},
 123                 {0, 0},
 124                 {0, 0}
 125                 }
 126         },
 127         {0, 0, 1, 0,            /* 0x08 */
 128                 {{3, 3},
 129                 {0, 0},
 130                 {0, 0},
 131                 {0, 0}
 132                 }
 133         },
 134         {1, 0, 2, 0,            /* 0x09 */
 135                 {{0, 0},
 136                 {3, 3},
 137                 {0, 0},
 138                 {0, 0}
 139                 }
 140         },
 141         {0, 0, 2, 0,            /* 0x0a */
 142                 {{1, 1},
 143                 {3, 3},
 144                 {0, 0},
 145                 {0, 0}
 146                 }
 147         },
 148         {1, 0, 2, 0,            /* 0x0b */
 149                 {{0, 1},
 150                 {3, 3},
 151                 {0, 0},
 152                 {0, 0}
 153                 }
 154         },
 155         {0, 0, 1, 0,            /* 0x0c */
 156                 {{2, 3},
 157                 {0, 0},
 158                 {0, 0},
 159                 {0, 0}
 160                 }
 161         },
 162         {1, 0, 2, 0,            /* 0x0d */
 163                 {{0, 0},
 164                 {2, 3},
 165                 {0, 0},
 166                 {0, 0}
 167                 }
 168         },
 169         {0, 0, 1, 0,            /* 0x0e */
 170                 {{1, 3},
 171                 {0, 0},
 172                 {0, 0},
 173                 {0, 0}
 174                 }
 175         },
 176         {1, 0, 1, 0,            /* 0x0f */
 177                 {{0, 3},
 178                 {0, 0},
 179                 {0, 0},
 180                 {0, 0}
 181                 }
 182         },
 183         {0, 0, 1, 0,            /* 0x10 */
 184                 {{4, 4},
 185                 {0, 0},
 186                 {0, 0},
 187                 {0, 0}
 188                 }
 189         },
 190         {1, 0, 2, 0,            /* 0x11 */
 191                 {{0, 0},
 192                 {4, 4},
 193                 {0, 0},
 194                 {0, 0}
 195                 }
 196         },
 197         {0, 0, 2, 0,            /* 0x12 */
 198                 {{1, 1},
 199                 {4, 4},
 200                 {0, 0},
 201                 {0, 0}
 202                 }
 203         },
 204         {1, 0, 2, 0,            /* 0x13 */
 205                 {{0, 1},
 206                 {4, 4},
 207                 {0, 0},
 208                 {0, 0}
 209                 }
 210         },
 211         {0, 0, 2, 0,            /* 0x14 */
 212                 {{2, 2},
 213                 {4, 4},
 214                 {0, 0},
 215                 {0, 0}
 216                 }
 217         },
 218         {1, 0, 3, 0,            /* 0x15 */
 219                 {{0, 0},
 220                 {2, 2},
 221                 {4, 4},
 222                 {0, 0}
 223                 }
 224         },
 225         {0, 0, 2, 0,            /* 0x16 */
 226                 {{1, 2},
 227                 {4, 4},
 228                 {0, 0},
 229                 {0, 0}
 230                 }
 231         },
 232         {1, 0, 2, 0,            /* 0x17 */
 233                 {{0, 2},
 234                 {4, 4},
 235                 {0, 0},
 236                 {0, 0}
 237                 }
 238         },
 239         {0, 0, 1, 0,            /* 0x18 */
 240                 {{3, 4},
 241                 {0, 0},
 242                 {0, 0},
 243                 {0, 0}
 244                 }
 245         },
 246         {1, 0, 2, 0,            /* 0x19 */
 247                 {{0, 0},
 248                 {3, 4},
 249                 {0, 0},
 250                 {0, 0}
 251                 }
 252         },
 253         {0, 0, 2, 0,            /* 0x1a */
 254                 {{1, 1},
 255                 {3, 4},
 256                 {0, 0},
 257                 {0, 0}
 258                 }
 259         },
 260         {1, 0, 2, 0,            /* 0x1b */
 261                 {{0, 1},
 262                 {3, 4},
 263                 {0, 0},
 264                 {0, 0}
 265                 }
 266         },
 267         {0, 0, 1, 0,            /* 0x1c */
 268                 {{2, 4},
 269                 {0, 0},
 270                 {0, 0},
 271                 {0, 0}
 272                 }
 273         },
 274         {1, 0, 2, 0,            /* 0x1d */
 275                 {{0, 0},
 276                 {2, 4},
 277                 {0, 0},
 278                 {0, 0}
 279                 }
 280         },
 281         {0, 0, 1, 0,            /* 0x1e */
 282                 {{1, 4},
 283                 {0, 0},
 284                 {0, 0},
 285                 {0, 0}
 286                 }
 287         },
 288         {1, 0, 1, 0,            /* 0x1f */
 289                 {{0, 4},
 290                 {0, 0},
 291                 {0, 0},
 292                 {0, 0}
 293                 }
 294         },
 295         {0, 0, 1, 0,            /* 0x20 */
 296                 {{5, 5},
 297                 {0, 0},
 298                 {0, 0},
 299                 {0, 0}
 300                 }
 301         },
 302         {1, 0, 2, 0,            /* 0x21 */
 303                 {{0, 0},
 304                 {5, 5},
 305                 {0, 0},
 306                 {0, 0}
 307                 }
 308         },
 309         {0, 0, 2, 0,            /* 0x22 */
 310                 {{1, 1},
 311                 {5, 5},
 312                 {0, 0},
 313                 {0, 0}
 314                 }
 315         },
 316         {1, 0, 2, 0,            /* 0x23 */
 317                 {{0, 1},
 318                 {5, 5},
 319                 {0, 0},
 320                 {0, 0}
 321                 }
 322         },
 323         {0, 0, 2, 0,            /* 0x24 */
 324                 {{2, 2},
 325                 {5, 5},
 326                 {0, 0},
 327                 {0, 0}
 328                 }
 329         },
 330         {1, 0, 3, 0,            /* 0x25 */
 331                 {{0, 0},
 332                 {2, 2},
 333                 {5, 5},
 334                 {0, 0}
 335                 }
 336         },
 337         {0, 0, 2, 0,            /* 0x26 */
 338                 {{1, 2},
 339                 {5, 5},
 340                 {0, 0},
 341                 {0, 0}
 342                 }
 343         },
 344         {1, 0, 2, 0,            /* 0x27 */
 345                 {{0, 2},
 346                 {5, 5},
 347                 {0, 0},
 348                 {0, 0}
 349                 }
 350         },
 351         {0, 0, 2, 0,            /* 0x28 */
 352                 {{3, 3},
 353                 {5, 5},
 354                 {0, 0},
 355                 {0, 0}
 356                 }
 357         },
 358         {1, 0, 3, 0,            /* 0x29 */
 359                 {{0, 0},
 360                 {3, 3},
 361                 {5, 5},
 362                 {0, 0}
 363                 }
 364         },
 365         {0, 0, 3, 0,            /* 0x2a */
 366                 {{1, 1},
 367                 {3, 3},
 368                 {5, 5},
 369                 {0, 0}
 370                 }
 371         },
 372         {1, 0, 3, 0,            /* 0x2b */
 373                 {{0, 1},
 374                 {3, 3},
 375                 {5, 5},
 376                 {0, 0}
 377                 }
 378         },
 379         {0, 0, 2, 0,            /* 0x2c */
 380                 {{2, 3},
 381                 {5, 5},
 382                 {0, 0},
 383                 {0, 0}
 384                 }
 385         },
 386         {1, 0, 3, 0,            /* 0x2d */
 387                 {{0, 0},
 388                 {2, 3},
 389                 {5, 5},
 390                 {0, 0}
 391                 }
 392         },
 393         {0, 0, 2, 0,            /* 0x2e */
 394                 {{1, 3},
 395                 {5, 5},
 396                 {0, 0},
 397                 {0, 0}
 398                 }
 399         },
 400         {1, 0, 2, 0,            /* 0x2f */
 401                 {{0, 3},
 402                 {5, 5},
 403                 {0, 0},
 404                 {0, 0}
 405                 }
 406         },
 407         {0, 0, 1, 0,            /* 0x30 */
 408                 {{4, 5},
 409                 {0, 0},
 410                 {0, 0},
 411                 {0, 0}
 412                 }
 413         },
 414         {1, 0, 2, 0,            /* 0x31 */
 415                 {{0, 0},
 416                 {4, 5},
 417                 {0, 0},
 418                 {0, 0}
 419                 }
 420         },
 421         {0, 0, 2, 0,            /* 0x32 */
 422                 {{1, 1},
 423                 {4, 5},
 424                 {0, 0},
 425                 {0, 0}
 426                 }
 427         },
 428         {1, 0, 2, 0,            /* 0x33 */
 429                 {{0, 1},
 430                 {4, 5},
 431                 {0, 0},
 432                 {0, 0}
 433                 }
 434         },
 435         {0, 0, 2, 0,            /* 0x34 */
 436                 {{2, 2},
 437                 {4, 5},
 438                 {0, 0},
 439                 {0, 0}
 440                 }
 441         },
 442         {1, 0, 3, 0,            /* 0x35 */
 443                 {{0, 0},
 444                 {2, 2},
 445                 {4, 5},
 446                 {0, 0}
 447                 }
 448         },
 449         {0, 0, 2, 0,            /* 0x36 */
 450                 {{1, 2},
 451                 {4, 5},
 452                 {0, 0},
 453                 {0, 0}
 454                 }
 455         },
 456         {1, 0, 2, 0,            /* 0x37 */
 457                 {{0, 2},
 458                 {4, 5},
 459                 {0, 0},
 460                 {0, 0}
 461                 }
 462         },
 463         {0, 0, 1, 0,            /* 0x38 */
 464                 {{3, 5},
 465                 {0, 0},
 466                 {0, 0},
 467                 {0, 0}
 468                 }
 469         },
 470         {1, 0, 2, 0,            /* 0x39 */
 471                 {{0, 0},
 472                 {3, 5},
 473                 {0, 0},
 474                 {0, 0}
 475                 }
 476         },
 477         {0, 0, 2, 0,            /* 0x3a */
 478                 {{1, 1},
 479                 {3, 5},
 480                 {0, 0},
 481                 {0, 0}
 482                 }
 483         },
 484         {1, 0, 2, 0,            /* 0x3b */
 485                 {{0, 1},
 486                 {3, 5},
 487                 {0, 0},
 488                 {0, 0}
 489                 }
 490         },
 491         {0, 0, 1, 0,            /* 0x3c */
 492                 {{2, 5},
 493                 {0, 0},
 494                 {0, 0},
 495                 {0, 0}
 496                 }
 497         },
 498         {1, 0, 2, 0,            /* 0x3d */
 499                 {{0, 0},
 500                 {2, 5},
 501                 {0, 0},
 502                 {0, 0}
 503                 }
 504         },
 505         {0, 0, 1, 0,            /* 0x3e */
 506                 {{1, 5},
 507                 {0, 0},
 508                 {0, 0},
 509                 {0, 0}
 510                 }
 511         },
 512         {1, 0, 1, 0,            /* 0x3f */
 513                 {{0, 5},
 514                 {0, 0},
 515                 {0, 0},
 516                 {0, 0}
 517                 }
 518         },
 519         {0, 0, 1, 0,            /* 0x40 */
 520                 {{6, 6},
 521                 {0, 0},
 522                 {0, 0},
 523                 {0, 0}
 524                 }
 525         },
 526         {1, 0, 2, 0,            /* 0x41 */
 527                 {{0, 0},
 528                 {6, 6},
 529                 {0, 0},
 530                 {0, 0}
 531                 }
 532         },
 533         {0, 0, 2, 0,            /* 0x42 */
 534                 {{1, 1},
 535                 {6, 6},
 536                 {0, 0},
 537                 {0, 0}
 538                 }
 539         },
 540         {1, 0, 2, 0,            /* 0x43 */
 541                 {{0, 1},
 542                 {6, 6},
 543                 {0, 0},
 544                 {0, 0}
 545                 }
 546         },
 547         {0, 0, 2, 0,            /* 0x44 */
 548                 {{2, 2},
 549                 {6, 6},
 550                 {0, 0},
 551                 {0, 0}
 552                 }
 553         },
 554         {1, 0, 3, 0,            /* 0x45 */
 555                 {{0, 0},
 556                 {2, 2},
 557                 {6, 6},
 558                 {0, 0}
 559                 }
 560         },
 561         {0, 0, 2, 0,            /* 0x46 */
 562                 {{1, 2},
 563                 {6, 6},
 564                 {0, 0},
 565                 {0, 0}
 566                 }
 567         },
 568         {1, 0, 2, 0,            /* 0x47 */
 569                 {{0, 2},
 570                 {6, 6},
 571                 {0, 0},
 572                 {0, 0}
 573                 }
 574         },
 575         {0, 0, 2, 0,            /* 0x48 */
 576                 {{3, 3},
 577                 {6, 6},
 578                 {0, 0},
 579                 {0, 0}
 580                 }
 581         },
 582         {1, 0, 3, 0,            /* 0x49 */
 583                 {{0, 0},
 584                 {3, 3},
 585                 {6, 6},
 586                 {0, 0}
 587                 }
 588         },
 589         {0, 0, 3, 0,            /* 0x4a */
 590                 {{1, 1},
 591                 {3, 3},
 592                 {6, 6},
 593                 {0, 0}
 594                 }
 595         },
 596         {1, 0, 3, 0,            /* 0x4b */
 597                 {{0, 1},
 598                 {3, 3},
 599                 {6, 6},
 600                 {0, 0}
 601                 }
 602         },
 603         {0, 0, 2, 0,            /* 0x4c */
 604                 {{2, 3},
 605                 {6, 6},
 606                 {0, 0},
 607                 {0, 0}
 608                 }
 609         },
 610         {1, 0, 3, 0,            /* 0x4d */
 611                 {{0, 0},
 612                 {2, 3},
 613                 {6, 6},
 614                 {0, 0}
 615                 }
 616         },
 617         {0, 0, 2, 0,            /* 0x4e */
 618                 {{1, 3},
 619                 {6, 6},
 620                 {0, 0},
 621                 {0, 0}
 622                 }
 623         },
 624         {1, 0, 2, 0,            /* 0x4f */
 625                 {{0, 3},
 626                 {6, 6},
 627                 {0, 0},
 628                 {0, 0}
 629                 }
 630         },
 631         {0, 0, 2, 0,            /* 0x50 */
 632                 {{4, 4},
 633                 {6, 6},
 634                 {0, 0},
 635                 {0, 0}
 636                 }
 637         },
 638         {1, 0, 3, 0,            /* 0x51 */
 639                 {{0, 0},
 640                 {4, 4},
 641                 {6, 6},
 642                 {0, 0}
 643                 }
 644         },
 645         {0, 0, 3, 0,            /* 0x52 */
 646                 {{1, 1},
 647                 {4, 4},
 648                 {6, 6},
 649                 {0, 0}
 650                 }
 651         },
 652         {1, 0, 3, 0,            /* 0x53 */
 653                 {{0, 1},
 654                 {4, 4},
 655                 {6, 6},
 656                 {0, 0}
 657                 }
 658         },
 659         {0, 0, 3, 0,            /* 0x54 */
 660                 {{2, 2},
 661                 {4, 4},
 662                 {6, 6},
 663                 {0, 0}
 664                 }
 665         },
 666         {1, 0, 4, 0,            /* 0x55 */
 667                 {{0, 0},
 668                 {2, 2},
 669                 {4, 4},
 670                 {6, 6}
 671                 }
 672         },
 673         {0, 0, 3, 0,            /* 0x56 */
 674                 {{1, 2},
 675                 {4, 4},
 676                 {6, 6},
 677                 {0, 0}
 678                 }
 679         },
 680         {1, 0, 3, 0,            /* 0x57 */
 681                 {{0, 2},
 682                 {4, 4},
 683                 {6, 6},
 684                 {0, 0}
 685                 }
 686         },
 687         {0, 0, 2, 0,            /* 0x58 */
 688                 {{3, 4},
 689                 {6, 6},
 690                 {0, 0},
 691                 {0, 0}
 692                 }
 693         },
 694         {1, 0, 3, 0,            /* 0x59 */
 695                 {{0, 0},
 696                 {3, 4},
 697                 {6, 6},
 698                 {0, 0}
 699                 }
 700         },
 701         {0, 0, 3, 0,            /* 0x5a */
 702                 {{1, 1},
 703                 {3, 4},
 704                 {6, 6},
 705                 {0, 0}
 706                 }
 707         },
 708         {1, 0, 3, 0,            /* 0x5b */
 709                 {{0, 1},
 710                 {3, 4},
 711                 {6, 6},
 712                 {0, 0}
 713                 }
 714         },
 715         {0, 0, 2, 0,            /* 0x5c */
 716                 {{2, 4},
 717                 {6, 6},
 718                 {0, 0},
 719                 {0, 0}
 720                 }
 721         },
 722         {1, 0, 3, 0,            /* 0x5d */
 723                 {{0, 0},
 724                 {2, 4},
 725                 {6, 6},
 726                 {0, 0}
 727                 }
 728         },
 729         {0, 0, 2, 0,            /* 0x5e */
 730                 {{1, 4},
 731                 {6, 6},
 732                 {0, 0},
 733                 {0, 0}
 734                 }
 735         },
 736         {1, 0, 2, 0,            /* 0x5f */
 737                 {{0, 4},
 738                 {6, 6},
 739                 {0, 0},
 740                 {0, 0}
 741                 }
 742         },
 743         {0, 0, 1, 0,            /* 0x60 */
 744                 {{5, 6},
 745                 {0, 0},
 746                 {0, 0},
 747                 {0, 0}
 748                 }
 749         },
 750         {1, 0, 2, 0,            /* 0x61 */
 751                 {{0, 0},
 752                 {5, 6},
 753                 {0, 0},
 754                 {0, 0}
 755                 }
 756         },
 757         {0, 0, 2, 0,            /* 0x62 */
 758                 {{1, 1},
 759                 {5, 6},
 760                 {0, 0},
 761                 {0, 0}
 762                 }
 763         },
 764         {1, 0, 2, 0,            /* 0x63 */
 765                 {{0, 1},
 766                 {5, 6},
 767                 {0, 0},
 768                 {0, 0}
 769                 }
 770         },
 771         {0, 0, 2, 0,            /* 0x64 */
 772                 {{2, 2},
 773                 {5, 6},
 774                 {0, 0},
 775                 {0, 0}
 776                 }
 777         },
 778         {1, 0, 3, 0,            /* 0x65 */
 779                 {{0, 0},
 780                 {2, 2},
 781                 {5, 6},
 782                 {0, 0}
 783                 }
 784         },
 785         {0, 0, 2, 0,            /* 0x66 */
 786                 {{1, 2},
 787                 {5, 6},
 788                 {0, 0},
 789                 {0, 0}
 790                 }
 791         },
 792         {1, 0, 2, 0,            /* 0x67 */
 793                 {{0, 2},
 794                 {5, 6},
 795                 {0, 0},
 796                 {0, 0}
 797                 }
 798         },
 799         {0, 0, 2, 0,            /* 0x68 */
 800                 {{3, 3},
 801                 {5, 6},
 802                 {0, 0},
 803                 {0, 0}
 804                 }
 805         },
 806         {1, 0, 3, 0,            /* 0x69 */
 807                 {{0, 0},
 808                 {3, 3},
 809                 {5, 6},
 810                 {0, 0}
 811                 }
 812         },
 813         {0, 0, 3, 0,            /* 0x6a */
 814                 {{1, 1},
 815                 {3, 3},
 816                 {5, 6},
 817                 {0, 0}
 818                 }
 819         },
 820         {1, 0, 3, 0,            /* 0x6b */
 821                 {{0, 1},
 822                 {3, 3},
 823                 {5, 6},
 824                 {0, 0}
 825                 }
 826         },
 827         {0, 0, 2, 0,            /* 0x6c */
 828                 {{2, 3},
 829                 {5, 6},
 830                 {0, 0},
 831                 {0, 0}
 832                 }
 833         },
 834         {1, 0, 3, 0,            /* 0x6d */
 835                 {{0, 0},
 836                 {2, 3},
 837                 {5, 6},
 838                 {0, 0}
 839                 }
 840         },
 841         {0, 0, 2, 0,            /* 0x6e */
 842                 {{1, 3},
 843                 {5, 6},
 844                 {0, 0},
 845                 {0, 0}
 846                 }
 847         },
 848         {1, 0, 2, 0,            /* 0x6f */
 849                 {{0, 3},
 850                 {5, 6},
 851                 {0, 0},
 852                 {0, 0}
 853                 }
 854         },
 855         {0, 0, 1, 0,            /* 0x70 */
 856                 {{4, 6},
 857                 {0, 0},
 858                 {0, 0},
 859                 {0, 0}
 860                 }
 861         },
 862         {1, 0, 2, 0,            /* 0x71 */
 863                 {{0, 0},
 864                 {4, 6},
 865                 {0, 0},
 866                 {0, 0}
 867                 }
 868         },
 869         {0, 0, 2, 0,            /* 0x72 */
 870                 {{1, 1},
 871                 {4, 6},
 872                 {0, 0},
 873                 {0, 0}
 874                 }
 875         },
 876         {1, 0, 2, 0,            /* 0x73 */
 877                 {{0, 1},
 878                 {4, 6},
 879                 {0, 0},
 880                 {0, 0}
 881                 }
 882         },
 883         {0, 0, 2, 0,            /* 0x74 */
 884                 {{2, 2},
 885                 {4, 6},
 886                 {0, 0},
 887                 {0, 0}
 888                 }
 889         },
 890         {1, 0, 3, 0,            /* 0x75 */
 891                 {{0, 0},
 892                 {2, 2},
 893                 {4, 6},
 894                 {0, 0}
 895                 }
 896         },
 897         {0, 0, 2, 0,            /* 0x76 */
 898                 {{1, 2},
 899                 {4, 6},
 900                 {0, 0},
 901                 {0, 0}
 902                 }
 903         },
 904         {1, 0, 2, 0,            /* 0x77 */
 905                 {{0, 2},
 906                 {4, 6},
 907                 {0, 0},
 908                 {0, 0}
 909                 }
 910         },
 911         {0, 0, 1, 0,            /* 0x78 */
 912                 {{3, 6},
 913                 {0, 0},
 914                 {0, 0},
 915                 {0, 0}
 916                 }
 917         },
 918         {1, 0, 2, 0,            /* 0x79 */
 919                 {{0, 0},
 920                 {3, 6},
 921                 {0, 0},
 922                 {0, 0}
 923                 }
 924         },
 925         {0, 0, 2, 0,            /* 0x7a */
 926                 {{1, 1},
 927                 {3, 6},
 928                 {0, 0},
 929                 {0, 0}
 930                 }
 931         },
 932         {1, 0, 2, 0,            /* 0x7b */
 933                 {{0, 1},
 934                 {3, 6},
 935                 {0, 0},
 936                 {0, 0}
 937                 }
 938         },
 939         {0, 0, 1, 0,            /* 0x7c */
 940                 {{2, 6},
 941                 {0, 0},
 942                 {0, 0},
 943                 {0, 0}
 944                 }
 945         },
 946         {1, 0, 2, 0,            /* 0x7d */
 947                 {{0, 0},
 948                 {2, 6},
 949                 {0, 0},
 950                 {0, 0}
 951                 }
 952         },
 953         {0, 0, 1, 0,            /* 0x7e */
 954                 {{1, 6},
 955                 {0, 0},
 956                 {0, 0},
 957                 {0, 0}
 958                 }
 959         },
 960         {1, 0, 1, 0,            /* 0x7f */
 961                 {{0, 6},
 962                 {0, 0},
 963                 {0, 0},
 964                 {0, 0}
 965                 }
 966         },
 967         {0, 1, 1, 0,            /* 0x80 */
 968                 {{7, 7},
 969                 {0, 0},
 970                 {0, 0},
 971                 {0, 0}
 972                 }
 973         },
 974         {1, 1, 2, 0,            /* 0x81 */
 975                 {{0, 0},
 976                 {7, 7},
 977                 {0, 0},
 978                 {0, 0}
 979                 }
 980         },
 981         {0, 1, 2, 0,            /* 0x82 */
 982                 {{1, 1},
 983                 {7, 7},
 984                 {0, 0},
 985                 {0, 0}
 986                 }
 987         },
 988         {1, 1, 2, 0,            /* 0x83 */
 989                 {{0, 1},
 990                 {7, 7},
 991                 {0, 0},
 992                 {0, 0}
 993                 }
 994         },
 995         {0, 1, 2, 0,            /* 0x84 */
 996                 {{2, 2},
 997                 {7, 7},
 998                 {0, 0},
 999                 {0, 0}
1000                 }
1001         },
1002         {1, 1, 3, 0,            /* 0x85 */
1003                 {{0, 0},
1004                 {2, 2},
1005                 {7, 7},
1006                 {0, 0}
1007                 }
1008         },
1009         {0, 1, 2, 0,            /* 0x86 */
1010                 {{1, 2},
1011                 {7, 7},
1012                 {0, 0},
1013                 {0, 0}
1014                 }
1015         },
1016         {1, 1, 2, 0,            /* 0x87 */
1017                 {{0, 2},
1018                 {7, 7},
1019                 {0, 0},
1020                 {0, 0}
1021                 }
1022         },
1023         {0, 1, 2, 0,            /* 0x88 */
1024                 {{3, 3},
1025                 {7, 7},
1026                 {0, 0},
1027                 {0, 0}
1028                 }
1029         },
1030         {1, 1, 3, 0,            /* 0x89 */
1031                 {{0, 0},
1032                 {3, 3},
1033                 {7, 7},
1034                 {0, 0}
1035                 }
1036         },
1037         {0, 1, 3, 0,            /* 0x8a */
1038                 {{1, 1},
1039                 {3, 3},
1040                 {7, 7},
1041                 {0, 0}
1042                 }
1043         },
1044         {1, 1, 3, 0,            /* 0x8b */
1045                 {{0, 1},
1046                 {3, 3},
1047                 {7, 7},
1048                 {0, 0}
1049                 }
1050         },
1051         {0, 1, 2, 0,            /* 0x8c */
1052                 {{2, 3},
1053                 {7, 7},
1054                 {0, 0},
1055                 {0, 0}
1056                 }
1057         },
1058         {1, 1, 3, 0,            /* 0x8d */
1059                 {{0, 0},
1060                 {2, 3},
1061                 {7, 7},
1062                 {0, 0}
1063                 }
1064         },
1065         {0, 1, 2, 0,            /* 0x8e */
1066                 {{1, 3},
1067                 {7, 7},
1068                 {0, 0},
1069                 {0, 0}
1070                 }
1071         },
1072         {1, 1, 2, 0,            /* 0x8f */
1073                 {{0, 3},
1074                 {7, 7},
1075                 {0, 0},
1076                 {0, 0}
1077                 }
1078         },
1079         {0, 1, 2, 0,            /* 0x90 */
1080                 {{4, 4},
1081                 {7, 7},
1082                 {0, 0},
1083                 {0, 0}
1084                 }
1085         },
1086         {1, 1, 3, 0,            /* 0x91 */
1087                 {{0, 0},
1088                 {4, 4},
1089                 {7, 7},
1090                 {0, 0}
1091                 }
1092         },
1093         {0, 1, 3, 0,            /* 0x92 */
1094                 {{1, 1},
1095                 {4, 4},
1096                 {7, 7},
1097                 {0, 0}
1098                 }
1099         },
1100         {1, 1, 3, 0,            /* 0x93 */
1101                 {{0, 1},
1102                 {4, 4},
1103                 {7, 7},
1104                 {0, 0}
1105                 }
1106         },
1107         {0, 1, 3, 0,            /* 0x94 */
1108                 {{2, 2},
1109                 {4, 4},
1110                 {7, 7},
1111                 {0, 0}
1112                 }
1113         },
1114         {1, 1, 4, 0,            /* 0x95 */
1115                 {{0, 0},
1116                 {2, 2},
1117                 {4, 4},
1118                 {7, 7}
1119                 }
1120         },
1121         {0, 1, 3, 0,            /* 0x96 */
1122                 {{1, 2},
1123                 {4, 4},
1124                 {7, 7},
1125                 {0, 0}
1126                 }
1127         },
1128         {1, 1, 3, 0,            /* 0x97 */
1129                 {{0, 2},
1130                 {4, 4},
1131                 {7, 7},
1132                 {0, 0}
1133                 }
1134         },
1135         {0, 1, 2, 0,            /* 0x98 */
1136                 {{3, 4},
1137                 {7, 7},
1138                 {0, 0},
1139                 {0, 0}
1140                 }
1141         },
1142         {1, 1, 3, 0,            /* 0x99 */
1143                 {{0, 0},
1144                 {3, 4},
1145                 {7, 7},
1146                 {0, 0}
1147                 }
1148         },
1149         {0, 1, 3, 0,            /* 0x9a */
1150                 {{1, 1},
1151                 {3, 4},
1152                 {7, 7},
1153                 {0, 0}
1154                 }
1155         },
1156         {1, 1, 3, 0,            /* 0x9b */
1157                 {{0, 1},
1158                 {3, 4},
1159                 {7, 7},
1160                 {0, 0}
1161                 }
1162         },
1163         {0, 1, 2, 0,            /* 0x9c */
1164                 {{2, 4},
1165                 {7, 7},
1166                 {0, 0},
1167                 {0, 0}
1168                 }
1169         },
1170         {1, 1, 3, 0,            /* 0x9d */
1171                 {{0, 0},
1172                 {2, 4},
1173                 {7, 7},
1174                 {0, 0}
1175                 }
1176         },
1177         {0, 1, 2, 0,            /* 0x9e */
1178                 {{1, 4},
1179                 {7, 7},
1180                 {0, 0},
1181                 {0, 0}
1182                 }
1183         },
1184         {1, 1, 2, 0,            /* 0x9f */
1185                 {{0, 4},
1186                 {7, 7},
1187                 {0, 0},
1188                 {0, 0}
1189                 }
1190         },
1191         {0, 1, 2, 0,            /* 0xa0 */
1192                 {{5, 5},
1193                 {7, 7},
1194                 {0, 0},
1195                 {0, 0}
1196                 }
1197         },
1198         {1, 1, 3, 0,            /* 0xa1 */
1199                 {{0, 0},
1200                 {5, 5},
1201                 {7, 7},
1202                 {0, 0}
1203                 }
1204         },
1205         {0, 1, 3, 0,            /* 0xa2 */
1206                 {{1, 1},
1207                 {5, 5},
1208                 {7, 7},
1209                 {0, 0}
1210                 }
1211         },
1212         {1, 1, 3, 0,            /* 0xa3 */
1213                 {{0, 1},
1214                 {5, 5},
1215                 {7, 7},
1216                 {0, 0}
1217                 }
1218         },
1219         {0, 1, 3, 0,            /* 0xa4 */
1220                 {{2, 2},
1221                 {5, 5},
1222                 {7, 7},
1223                 {0, 0}
1224                 }
1225         },
1226         {1, 1, 4, 0,            /* 0xa5 */
1227                 {{0, 0},
1228                 {2, 2},
1229                 {5, 5},
1230                 {7, 7}
1231                 }
1232         },
1233         {0, 1, 3, 0,            /* 0xa6 */
1234                 {{1, 2},
1235                 {5, 5},
1236                 {7, 7},
1237                 {0, 0}
1238                 }
1239         },
1240         {1, 1, 3, 0,            /* 0xa7 */
1241                 {{0, 2},
1242                 {5, 5},
1243                 {7, 7},
1244                 {0, 0}
1245                 }
1246         },
1247         {0, 1, 3, 0,            /* 0xa8 */
1248                 {{3, 3},
1249                 {5, 5},
1250                 {7, 7},
1251                 {0, 0}
1252                 }
1253         },
1254         {1, 1, 4, 0,            /* 0xa9 */
1255                 {{0, 0},
1256                 {3, 3},
1257                 {5, 5},
1258                 {7, 7}
1259                 }
1260         },
1261         {0, 1, 4, 0,            /* 0xaa */
1262                 {{1, 1},
1263                 {3, 3},
1264                 {5, 5},
1265                 {7, 7}
1266                 }
1267         },
1268         {1, 1, 4, 0,            /* 0xab */
1269                 {{0, 1},
1270                 {3, 3},
1271                 {5, 5},
1272                 {7, 7}
1273                 }
1274         },
1275         {0, 1, 3, 0,            /* 0xac */
1276                 {{2, 3},
1277                 {5, 5},
1278                 {7, 7},
1279                 {0, 0}
1280                 }
1281         },
1282         {1, 1, 4, 0,            /* 0xad */
1283                 {{0, 0},
1284                 {2, 3},
1285                 {5, 5},
1286                 {7, 7}
1287                 }
1288         },
1289         {0, 1, 3, 0,            /* 0xae */
1290                 {{1, 3},
1291                 {5, 5},
1292                 {7, 7},
1293                 {0, 0}
1294                 }
1295         },
1296         {1, 1, 3, 0,            /* 0xaf */
1297                 {{0, 3},
1298                 {5, 5},
1299                 {7, 7},
1300                 {0, 0}
1301                 }
1302         },
1303         {0, 1, 2, 0,            /* 0xb0 */
1304                 {{4, 5},
1305                 {7, 7},
1306                 {0, 0},
1307                 {0, 0}
1308                 }
1309         },
1310         {1, 1, 3, 0,            /* 0xb1 */
1311                 {{0, 0},
1312                 {4, 5},
1313                 {7, 7},
1314                 {0, 0}
1315                 }
1316         },
1317         {0, 1, 3, 0,            /* 0xb2 */
1318                 {{1, 1},
1319                 {4, 5},
1320                 {7, 7},
1321                 {0, 0}
1322                 }
1323         },
1324         {1, 1, 3, 0,            /* 0xb3 */
1325                 {{0, 1},
1326                 {4, 5},
1327                 {7, 7},
1328                 {0, 0}
1329                 }
1330         },
1331         {0, 1, 3, 0,            /* 0xb4 */
1332                 {{2, 2},
1333                 {4, 5},
1334                 {7, 7},
1335                 {0, 0}
1336                 }
1337         },
1338         {1, 1, 4, 0,            /* 0xb5 */
1339                 {{0, 0},
1340                 {2, 2},
1341                 {4, 5},
1342                 {7, 7}
1343                 }
1344         },
1345         {0, 1, 3, 0,            /* 0xb6 */
1346                 {{1, 2},
1347                 {4, 5},
1348                 {7, 7},
1349                 {0, 0}
1350                 }
1351         },
1352         {1, 1, 3, 0,            /* 0xb7 */
1353                 {{0, 2},
1354                 {4, 5},
1355                 {7, 7},
1356                 {0, 0}
1357                 }
1358         },
1359         {0, 1, 2, 0,            /* 0xb8 */
1360                 {{3, 5},
1361                 {7, 7},
1362                 {0, 0},
1363                 {0, 0}
1364                 }
1365         },
1366         {1, 1, 3, 0,            /* 0xb9 */
1367                 {{0, 0},
1368                 {3, 5},
1369                 {7, 7},
1370                 {0, 0}
1371                 }
1372         },
1373         {0, 1, 3, 0,            /* 0xba */
1374                 {{1, 1},
1375                 {3, 5},
1376                 {7, 7},
1377                 {0, 0}
1378                 }
1379         },
1380         {1, 1, 3, 0,            /* 0xbb */
1381                 {{0, 1},
1382                 {3, 5},
1383                 {7, 7},
1384                 {0, 0}
1385                 }
1386         },
1387         {0, 1, 2, 0,            /* 0xbc */
1388                 {{2, 5},
1389                 {7, 7},
1390                 {0, 0},
1391                 {0, 0}
1392                 }
1393         },
1394         {1, 1, 3, 0,            /* 0xbd */
1395                 {{0, 0},
1396                 {2, 5},
1397                 {7, 7},
1398                 {0, 0}
1399                 }
1400         },
1401         {0, 1, 2, 0,            /* 0xbe */
1402                 {{1, 5},
1403                 {7, 7},
1404                 {0, 0},
1405                 {0, 0}
1406                 }
1407         },
1408         {1, 1, 2, 0,            /* 0xbf */
1409                 {{0, 5},
1410                 {7, 7},
1411                 {0, 0},
1412                 {0, 0}
1413                 }
1414         },
1415         {0, 1, 1, 0,            /* 0xc0 */
1416                 {{6, 7},
1417                 {0, 0},
1418                 {0, 0},
1419                 {0, 0}
1420                 }
1421         },
1422         {1, 1, 2, 0,            /* 0xc1 */
1423                 {{0, 0},
1424                 {6, 7},
1425                 {0, 0},
1426                 {0, 0}
1427                 }
1428         },
1429         {0, 1, 2, 0,            /* 0xc2 */
1430                 {{1, 1},
1431                 {6, 7},
1432                 {0, 0},
1433                 {0, 0}
1434                 }
1435         },
1436         {1, 1, 2, 0,            /* 0xc3 */
1437                 {{0, 1},
1438                 {6, 7},
1439                 {0, 0},
1440                 {0, 0}
1441                 }
1442         },
1443         {0, 1, 2, 0,            /* 0xc4 */
1444                 {{2, 2},
1445                 {6, 7},
1446                 {0, 0},
1447                 {0, 0}
1448                 }
1449         },
1450         {1, 1, 3, 0,            /* 0xc5 */
1451                 {{0, 0},
1452                 {2, 2},
1453                 {6, 7},
1454                 {0, 0}
1455                 }
1456         },
1457         {0, 1, 2, 0,            /* 0xc6 */
1458                 {{1, 2},
1459                 {6, 7},
1460                 {0, 0},
1461                 {0, 0}
1462                 }
1463         },
1464         {1, 1, 2, 0,            /* 0xc7 */
1465                 {{0, 2},
1466                 {6, 7},
1467                 {0, 0},
1468                 {0, 0}
1469                 }
1470         },
1471         {0, 1, 2, 0,            /* 0xc8 */
1472                 {{3, 3},
1473                 {6, 7},
1474                 {0, 0},
1475                 {0, 0}
1476                 }
1477         },
1478         {1, 1, 3, 0,            /* 0xc9 */
1479                 {{0, 0},
1480                 {3, 3},
1481                 {6, 7},
1482                 {0, 0}
1483                 }
1484         },
1485         {0, 1, 3, 0,            /* 0xca */
1486                 {{1, 1},
1487                 {3, 3},
1488                 {6, 7},
1489                 {0, 0}
1490                 }
1491         },
1492         {1, 1, 3, 0,            /* 0xcb */
1493                 {{0, 1},
1494                 {3, 3},
1495                 {6, 7},
1496                 {0, 0}
1497                 }
1498         },
1499         {0, 1, 2, 0,            /* 0xcc */
1500                 {{2, 3},
1501                 {6, 7},
1502                 {0, 0},
1503                 {0, 0}
1504                 }
1505         },
1506         {1, 1, 3, 0,            /* 0xcd */
1507                 {{0, 0},
1508                 {2, 3},
1509                 {6, 7},
1510                 {0, 0}
1511                 }
1512         },
1513         {0, 1, 2, 0,            /* 0xce */
1514                 {{1, 3},
1515                 {6, 7},
1516                 {0, 0},
1517                 {0, 0}
1518                 }
1519         },
1520         {1, 1, 2, 0,            /* 0xcf */
1521                 {{0, 3},
1522                 {6, 7},
1523                 {0, 0},
1524                 {0, 0}
1525                 }
1526         },
1527         {0, 1, 2, 0,            /* 0xd0 */
1528                 {{4, 4},
1529                 {6, 7},
1530                 {0, 0},
1531                 {0, 0}
1532                 }
1533         },
1534         {1, 1, 3, 0,            /* 0xd1 */
1535                 {{0, 0},
1536                 {4, 4},
1537                 {6, 7},
1538                 {0, 0}
1539                 }
1540         },
1541         {0, 1, 3, 0,            /* 0xd2 */
1542                 {{1, 1},
1543                 {4, 4},
1544                 {6, 7},
1545                 {0, 0}
1546                 }
1547         },
1548         {1, 1, 3, 0,            /* 0xd3 */
1549                 {{0, 1},
1550                 {4, 4},
1551                 {6, 7},
1552                 {0, 0}
1553                 }
1554         },
1555         {0, 1, 3, 0,            /* 0xd4 */
1556                 {{2, 2},
1557                 {4, 4},
1558                 {6, 7},
1559                 {0, 0}
1560                 }
1561         },
1562         {1, 1, 4, 0,            /* 0xd5 */
1563                 {{0, 0},
1564                 {2, 2},
1565                 {4, 4},
1566                 {6, 7}
1567                 }
1568         },
1569         {0, 1, 3, 0,            /* 0xd6 */
1570                 {{1, 2},
1571                 {4, 4},
1572                 {6, 7},
1573                 {0, 0}
1574                 }
1575         },
1576         {1, 1, 3, 0,            /* 0xd7 */
1577                 {{0, 2},
1578                 {4, 4},
1579                 {6, 7},
1580                 {0, 0}
1581                 }
1582         },
1583         {0, 1, 2, 0,            /* 0xd8 */
1584                 {{3, 4},
1585                 {6, 7},
1586                 {0, 0},
1587                 {0, 0}
1588                 }
1589         },
1590         {1, 1, 3, 0,            /* 0xd9 */
1591                 {{0, 0},
1592                 {3, 4},
1593                 {6, 7},
1594                 {0, 0}
1595                 }
1596         },
1597         {0, 1, 3, 0,            /* 0xda */
1598                 {{1, 1},
1599                 {3, 4},
1600                 {6, 7},
1601                 {0, 0}
1602                 }
1603         },
1604         {1, 1, 3, 0,            /* 0xdb */
1605                 {{0, 1},
1606                 {3, 4},
1607                 {6, 7},
1608                 {0, 0}
1609                 }
1610         },
1611         {0, 1, 2, 0,            /* 0xdc */
1612                 {{2, 4},
1613                 {6, 7},
1614                 {0, 0},
1615                 {0, 0}
1616                 }
1617         },
1618         {1, 1, 3, 0,            /* 0xdd */
1619                 {{0, 0},
1620                 {2, 4},
1621                 {6, 7},
1622                 {0, 0}
1623                 }
1624         },
1625         {0, 1, 2, 0,            /* 0xde */
1626                 {{1, 4},
1627                 {6, 7},
1628                 {0, 0},
1629                 {0, 0}
1630                 }
1631         },
1632         {1, 1, 2, 0,            /* 0xdf */
1633                 {{0, 4},
1634                 {6, 7},
1635                 {0, 0},
1636                 {0, 0}
1637                 }
1638         },
1639         {0, 1, 1, 0,            /* 0xe0 */
1640                 {{5, 7},
1641                 {0, 0},
1642                 {0, 0},
1643                 {0, 0}
1644                 }
1645         },
1646         {1, 1, 2, 0,            /* 0xe1 */
1647                 {{0, 0},
1648                 {5, 7},
1649                 {0, 0},
1650                 {0, 0}
1651                 }
1652         },
1653         {0, 1, 2, 0,            /* 0xe2 */
1654                 {{1, 1},
1655                 {5, 7},
1656                 {0, 0},
1657                 {0, 0}
1658                 }
1659         },
1660         {1, 1, 2, 0,            /* 0xe3 */
1661                 {{0, 1},
1662                 {5, 7},
1663                 {0, 0},
1664                 {0, 0}
1665                 }
1666         },
1667         {0, 1, 2, 0,            /* 0xe4 */
1668                 {{2, 2},
1669                 {5, 7},
1670                 {0, 0},
1671                 {0, 0}
1672                 }
1673         },
1674         {1, 1, 3, 0,            /* 0xe5 */
1675                 {{0, 0},
1676                 {2, 2},
1677                 {5, 7},
1678                 {0, 0}
1679                 }
1680         },
1681         {0, 1, 2, 0,            /* 0xe6 */
1682                 {{1, 2},
1683                 {5, 7},
1684                 {0, 0},
1685                 {0, 0}
1686                 }
1687         },
1688         {1, 1, 2, 0,            /* 0xe7 */
1689                 {{0, 2},
1690                 {5, 7},
1691                 {0, 0},
1692                 {0, 0}
1693                 }
1694         },
1695         {0, 1, 2, 0,            /* 0xe8 */
1696                 {{3, 3},
1697                 {5, 7},
1698                 {0, 0},
1699                 {0, 0}
1700                 }
1701         },
1702         {1, 1, 3, 0,            /* 0xe9 */
1703                 {{0, 0},
1704                 {3, 3},
1705                 {5, 7},
1706                 {0, 0}
1707                 }
1708         },
1709         {0, 1, 3, 0,            /* 0xea */
1710                 {{1, 1},
1711                 {3, 3},
1712                 {5, 7},
1713                 {0, 0}
1714                 }
1715         },
1716         {1, 1, 3, 0,            /* 0xeb */
1717                 {{0, 1},
1718                 {3, 3},
1719                 {5, 7},
1720                 {0, 0}
1721                 }
1722         },
1723         {0, 1, 2, 0,            /* 0xec */
1724                 {{2, 3},
1725                 {5, 7},
1726                 {0, 0},
1727                 {0, 0}
1728                 }
1729         },
1730         {1, 1, 3, 0,            /* 0xed */
1731                 {{0, 0},
1732                 {2, 3},
1733                 {5, 7},
1734                 {0, 0}
1735                 }
1736         },
1737         {0, 1, 2, 0,            /* 0xee */
1738                 {{1, 3},
1739                 {5, 7},
1740                 {0, 0},
1741                 {0, 0}
1742                 }
1743         },
1744         {1, 1, 2, 0,            /* 0xef */
1745                 {{0, 3},
1746                 {5, 7},
1747                 {0, 0},
1748                 {0, 0}
1749                 }
1750         },
1751         {0, 1, 1, 0,            /* 0xf0 */
1752                 {{4, 7},
1753                 {0, 0},
1754                 {0, 0},
1755                 {0, 0}
1756                 }
1757         },
1758         {1, 1, 2, 0,            /* 0xf1 */
1759                 {{0, 0},
1760                 {4, 7},
1761                 {0, 0},
1762                 {0, 0}
1763                 }
1764         },
1765         {0, 1, 2, 0,            /* 0xf2 */
1766                 {{1, 1},
1767                 {4, 7},
1768                 {0, 0},
1769                 {0, 0}
1770                 }
1771         },
1772         {1, 1, 2, 0,            /* 0xf3 */
1773                 {{0, 1},
1774                 {4, 7},
1775                 {0, 0},
1776                 {0, 0}
1777                 }
1778         },
1779         {0, 1, 2, 0,            /* 0xf4 */
1780                 {{2, 2},
1781                 {4, 7},
1782                 {0, 0},
1783                 {0, 0}
1784                 }
1785         },
1786         {1, 1, 3, 0,            /* 0xf5 */
1787                 {{0, 0},
1788                 {2, 2},
1789                 {4, 7},
1790                 {0, 0}
1791                 }
1792         },
1793         {0, 1, 2, 0,            /* 0xf6 */
1794                 {{1, 2},
1795                 {4, 7},
1796                 {0, 0},
1797                 {0, 0}
1798                 }
1799         },
1800         {1, 1, 2, 0,            /* 0xf7 */
1801                 {{0, 2},
1802                 {4, 7},
1803                 {0, 0},
1804                 {0, 0}
1805                 }
1806         },
1807         {0, 1, 1, 0,            /* 0xf8 */
1808                 {{3, 7},
1809                 {0, 0},
1810                 {0, 0},
1811                 {0, 0}
1812                 }
1813         },
1814         {1, 1, 2, 0,            /* 0xf9 */
1815                 {{0, 0},
1816                 {3, 7},
1817                 {0, 0},
1818                 {0, 0}
1819                 }
1820         },
1821         {0, 1, 2, 0,            /* 0xfa */
1822                 {{1, 1},
1823                 {3, 7},
1824                 {0, 0},
1825                 {0, 0}
1826                 }
1827         },
1828         {1, 1, 2, 0,            /* 0xfb */
1829                 {{0, 1},
1830                 {3, 7},
1831                 {0, 0},
1832                 {0, 0}
1833                 }
1834         },
1835         {0, 1, 1, 0,            /* 0xfc */
1836                 {{2, 7},
1837                 {0, 0},
1838                 {0, 0},
1839                 {0, 0}
1840                 }
1841         },
1842         {1, 1, 2, 0,            /* 0xfd */
1843                 {{0, 0},
1844                 {2, 7},
1845                 {0, 0},
1846                 {0, 0}
1847                 }
1848         },
1849         {0, 1, 1, 0,            /* 0xfe */
1850                 {{1, 7},
1851                 {0, 0},
1852                 {0, 0},
1853                 {0, 0}
1854                 }
1855         },
1856         {1, 1, 1, 0,            /* 0xff */
1857                 {{0, 7},
1858                 {0, 0},
1859                 {0, 0},
1860                 {0, 0}
1861                 }
1862         }
1863 };
1864
1865
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     int ipv4_addr_legal,
1869     int ipv6_addr_legal,
1870     int loopback_scope,
1871     int ipv4_local_scope,
1872     int local_scope SCTP_UNUSED,/* XXX */
1873     int site_scope,
1874     int do_update)
1875 {
1876         if ((loopback_scope == 0) &&
1877             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1878                 /*
1879                  * skip loopback if not in scope *
1880                  */
1881                 return (0);
1882         }
1883         switch (ifa->address.sa.sa_family) {
1884 #ifdef INET
1885         case AF_INET:
1886                 if (ipv4_addr_legal) {
1887                         struct sockaddr_in *sin;
1888
1889                         sin = (struct sockaddr_in *)&ifa->address.sin;
1890                         if (sin->sin_addr.s_addr == 0) {
1891                                 /* not in scope , unspecified */
1892                                 return (0);
1893                         }
1894                         if ((ipv4_local_scope == 0) &&
1895                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1896                                 /* private address not in scope */
1897                                 return (0);
1898                         }
1899                 } else {
1900                         return (0);
1901                 }
1902                 break;
1903 #endif
1904 #ifdef INET6
1905         case AF_INET6:
1906                 if (ipv6_addr_legal) {
1907                         struct sockaddr_in6 *sin6;
1908
1909                         /*
1910                          * Must update the flags,  bummer, which means any
1911                          * IFA locks must now be applied HERE <->
1912                          */
1913                         if (do_update) {
1914                                 sctp_gather_internal_ifa_flags(ifa);
1915                         }
1916                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1917                                 return (0);
1918                         }
1919                         /* ok to use deprecated addresses? */
1920                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1921                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1922                                 /* skip unspecifed addresses */
1923                                 return (0);
1924                         }
1925                         if (    /* (local_scope == 0) && */
1926                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1927                                 return (0);
1928                         }
1929                         if ((site_scope == 0) &&
1930                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1931                                 return (0);
1932                         }
1933                 } else {
1934                         return (0);
1935                 }
1936                 break;
1937 #endif
1938         default:
1939                 return (0);
1940         }
1941         return (1);
1942 }
1943
1944 static struct mbuf *
1945 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1946 {
1947         struct sctp_paramhdr *parmh;
1948         struct mbuf *mret;
1949         int len;
1950
1951         switch (ifa->address.sa.sa_family) {
1952 #ifdef INET
1953         case AF_INET:
1954                 len = sizeof(struct sctp_ipv4addr_param);
1955                 break;
1956 #endif
1957 #ifdef INET6
1958         case AF_INET6:
1959                 len = sizeof(struct sctp_ipv6addr_param);
1960                 break;
1961 #endif
1962         default:
1963                 return (m);
1964         }
1965         if (M_TRAILINGSPACE(m) >= len) {
1966                 /* easy side we just drop it on the end */
1967                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1968                 mret = m;
1969         } else {
1970                 /* Need more space */
1971                 mret = m;
1972                 while (SCTP_BUF_NEXT(mret) != NULL) {
1973                         mret = SCTP_BUF_NEXT(mret);
1974                 }
1975                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1976                 if (SCTP_BUF_NEXT(mret) == NULL) {
1977                         /* We are hosed, can't add more addresses */
1978                         return (m);
1979                 }
1980                 mret = SCTP_BUF_NEXT(mret);
1981                 parmh = mtod(mret, struct sctp_paramhdr *);
1982         }
1983         /* now add the parameter */
1984         switch (ifa->address.sa.sa_family) {
1985 #ifdef INET
1986         case AF_INET:
1987                 {
1988                         struct sctp_ipv4addr_param *ipv4p;
1989                         struct sockaddr_in *sin;
1990
1991                         sin = (struct sockaddr_in *)&ifa->address.sin;
1992                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1993                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1994                         parmh->param_length = htons(len);
1995                         ipv4p->addr = sin->sin_addr.s_addr;
1996                         SCTP_BUF_LEN(mret) += len;
1997                         break;
1998                 }
1999 #endif
2000 #ifdef INET6
2001         case AF_INET6:
2002                 {
2003                         struct sctp_ipv6addr_param *ipv6p;
2004                         struct sockaddr_in6 *sin6;
2005
2006                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2007                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2008                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2009                         parmh->param_length = htons(len);
2010                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2011                             sizeof(ipv6p->addr));
2012                         /* clear embedded scope in the address */
2013                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2014                         SCTP_BUF_LEN(mret) += len;
2015                         break;
2016                 }
2017 #endif
2018         default:
2019                 return (m);
2020         }
2021         return (mret);
2022 }
2023
2024
2025 struct mbuf *
2026 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2027     struct sctp_scoping *scope,
2028     struct mbuf *m_at, int cnt_inits_to)
2029 {
2030         struct sctp_vrf *vrf = NULL;
2031         int cnt, limit_out = 0, total_count;
2032         uint32_t vrf_id;
2033
2034         vrf_id = inp->def_vrf_id;
2035         SCTP_IPI_ADDR_RLOCK();
2036         vrf = sctp_find_vrf(vrf_id);
2037         if (vrf == NULL) {
2038                 SCTP_IPI_ADDR_RUNLOCK();
2039                 return (m_at);
2040         }
2041         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2042                 struct sctp_ifa *sctp_ifap;
2043                 struct sctp_ifn *sctp_ifnp;
2044
2045                 cnt = cnt_inits_to;
2046                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2047                         limit_out = 1;
2048                         cnt = SCTP_ADDRESS_LIMIT;
2049                         goto skip_count;
2050                 }
2051                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2052                         if ((scope->loopback_scope == 0) &&
2053                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2054                                 /*
2055                                  * Skip loopback devices if loopback_scope
2056                                  * not set
2057                                  */
2058                                 continue;
2059                         }
2060                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2061                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2062                                         continue;
2063                                 }
2064                                 if (sctp_is_address_in_scope(sctp_ifap,
2065                                     scope->ipv4_addr_legal,
2066                                     scope->ipv6_addr_legal,
2067                                     scope->loopback_scope,
2068                                     scope->ipv4_local_scope,
2069                                     scope->local_scope,
2070                                     scope->site_scope, 1) == 0) {
2071                                         continue;
2072                                 }
2073                                 cnt++;
2074                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2075                                         break;
2076                                 }
2077                         }
2078                         if (cnt > SCTP_ADDRESS_LIMIT) {
2079                                 break;
2080                         }
2081                 }
2082 skip_count:
2083                 if (cnt > 1) {
2084                         total_count = 0;
2085                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2086                                 cnt = 0;
2087                                 if ((scope->loopback_scope == 0) &&
2088                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2089                                         /*
2090                                          * Skip loopback devices if
2091                                          * loopback_scope not set
2092                                          */
2093                                         continue;
2094                                 }
2095                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2096                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2097                                                 continue;
2098                                         }
2099                                         if (sctp_is_address_in_scope(sctp_ifap,
2100                                             scope->ipv4_addr_legal,
2101                                             scope->ipv6_addr_legal,
2102                                             scope->loopback_scope,
2103                                             scope->ipv4_local_scope,
2104                                             scope->local_scope,
2105                                             scope->site_scope, 0) == 0) {
2106                                                 continue;
2107                                         }
2108                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2109                                         if (limit_out) {
2110                                                 cnt++;
2111                                                 total_count++;
2112                                                 if (cnt >= 2) {
2113                                                         /*
2114                                                          * two from each
2115                                                          * address
2116                                                          */
2117                                                         break;
2118                                                 }
2119                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2120                                                         /* No more addresses */
2121                                                         break;
2122                                                 }
2123                                         }
2124                                 }
2125                         }
2126                 }
2127         } else {
2128                 struct sctp_laddr *laddr;
2129
2130                 cnt = cnt_inits_to;
2131                 /* First, how many ? */
2132                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2133                         if (laddr->ifa == NULL) {
2134                                 continue;
2135                         }
2136                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2137                                 /*
2138                                  * Address being deleted by the system, dont
2139                                  * list.
2140                                  */
2141                                 continue;
2142                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2143                                 /*
2144                                  * Address being deleted on this ep don't
2145                                  * list.
2146                                  */
2147                                 continue;
2148                         }
2149                         if (sctp_is_address_in_scope(laddr->ifa,
2150                             scope->ipv4_addr_legal,
2151                             scope->ipv6_addr_legal,
2152                             scope->loopback_scope,
2153                             scope->ipv4_local_scope,
2154                             scope->local_scope,
2155                             scope->site_scope, 1) == 0) {
2156                                 continue;
2157                         }
2158                         cnt++;
2159                 }
2160                 /*
2161                  * To get through a NAT we only list addresses if we have
2162                  * more than one. That way if you just bind a single address
2163                  * we let the source of the init dictate our address.
2164                  */
2165                 if (cnt > 1) {
2166                         cnt = cnt_inits_to;
2167                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2168                                 if (laddr->ifa == NULL) {
2169                                         continue;
2170                                 }
2171                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2172                                         continue;
2173                                 }
2174                                 if (sctp_is_address_in_scope(laddr->ifa,
2175                                     scope->ipv4_addr_legal,
2176                                     scope->ipv6_addr_legal,
2177                                     scope->loopback_scope,
2178                                     scope->ipv4_local_scope,
2179                                     scope->local_scope,
2180                                     scope->site_scope, 0) == 0) {
2181                                         continue;
2182                                 }
2183                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2184                                 cnt++;
2185                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2186                                         break;
2187                                 }
2188                         }
2189                 }
2190         }
2191         SCTP_IPI_ADDR_RUNLOCK();
2192         return (m_at);
2193 }
2194
2195 static struct sctp_ifa *
2196 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2197     uint8_t dest_is_loop,
2198     uint8_t dest_is_priv,
2199     sa_family_t fam)
2200 {
2201         uint8_t dest_is_global = 0;
2202
2203         /* dest_is_priv is true if destination is a private address */
2204         /* dest_is_loop is true if destination is a loopback addresses */
2205
2206         /**
2207          * Here we determine if its a preferred address. A preferred address
2208          * means it is the same scope or higher scope then the destination.
2209          * L = loopback, P = private, G = global
2210          * -----------------------------------------
2211          *    src    |  dest | result
2212          *  ----------------------------------------
2213          *     L     |    L  |    yes
2214          *  -----------------------------------------
2215          *     P     |    L  |    yes-v4 no-v6
2216          *  -----------------------------------------
2217          *     G     |    L  |    yes-v4 no-v6
2218          *  -----------------------------------------
2219          *     L     |    P  |    no
2220          *  -----------------------------------------
2221          *     P     |    P  |    yes
2222          *  -----------------------------------------
2223          *     G     |    P  |    no
2224          *   -----------------------------------------
2225          *     L     |    G  |    no
2226          *   -----------------------------------------
2227          *     P     |    G  |    no
2228          *    -----------------------------------------
2229          *     G     |    G  |    yes
2230          *    -----------------------------------------
2231          */
2232
2233         if (ifa->address.sa.sa_family != fam) {
2234                 /* forget mis-matched family */
2235                 return (NULL);
2236         }
2237         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2238                 dest_is_global = 1;
2239         }
2240         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2241         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2242         /* Ok the address may be ok */
2243 #ifdef INET6
2244         if (fam == AF_INET6) {
2245                 /* ok to use deprecated addresses? no lets not! */
2246                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2247                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2248                         return (NULL);
2249                 }
2250                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2251                         if (dest_is_loop) {
2252                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2253                                 return (NULL);
2254                         }
2255                 }
2256                 if (ifa->src_is_glob) {
2257                         if (dest_is_loop) {
2258                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2259                                 return (NULL);
2260                         }
2261                 }
2262         }
2263 #endif
2264         /*
2265          * Now that we know what is what, implement or table this could in
2266          * theory be done slicker (it used to be), but this is
2267          * straightforward and easier to validate :-)
2268          */
2269         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2270             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2271         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2272             dest_is_loop, dest_is_priv, dest_is_global);
2273
2274         if ((ifa->src_is_loop) && (dest_is_priv)) {
2275                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2276                 return (NULL);
2277         }
2278         if ((ifa->src_is_glob) && (dest_is_priv)) {
2279                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2280                 return (NULL);
2281         }
2282         if ((ifa->src_is_loop) && (dest_is_global)) {
2283                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2284                 return (NULL);
2285         }
2286         if ((ifa->src_is_priv) && (dest_is_global)) {
2287                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2288                 return (NULL);
2289         }
2290         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2291         /* its a preferred address */
2292         return (ifa);
2293 }
2294
2295 static struct sctp_ifa *
2296 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2297     uint8_t dest_is_loop,
2298     uint8_t dest_is_priv,
2299     sa_family_t fam)
2300 {
2301         uint8_t dest_is_global = 0;
2302
2303         /**
2304          * Here we determine if its a acceptable address. A acceptable
2305          * address means it is the same scope or higher scope but we can
2306          * allow for NAT which means its ok to have a global dest and a
2307          * private src.
2308          *
2309          * L = loopback, P = private, G = global
2310          * -----------------------------------------
2311          *  src    |  dest | result
2312          * -----------------------------------------
2313          *   L     |   L   |    yes
2314          *  -----------------------------------------
2315          *   P     |   L   |    yes-v4 no-v6
2316          *  -----------------------------------------
2317          *   G     |   L   |    yes
2318          * -----------------------------------------
2319          *   L     |   P   |    no
2320          * -----------------------------------------
2321          *   P     |   P   |    yes
2322          * -----------------------------------------
2323          *   G     |   P   |    yes - May not work
2324          * -----------------------------------------
2325          *   L     |   G   |    no
2326          * -----------------------------------------
2327          *   P     |   G   |    yes - May not work
2328          * -----------------------------------------
2329          *   G     |   G   |    yes
2330          * -----------------------------------------
2331          */
2332
2333         if (ifa->address.sa.sa_family != fam) {
2334                 /* forget non matching family */
2335                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2336                     ifa->address.sa.sa_family, fam);
2337                 return (NULL);
2338         }
2339         /* Ok the address may be ok */
2340         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2341         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2342             dest_is_loop, dest_is_priv);
2343         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2344                 dest_is_global = 1;
2345         }
2346 #ifdef INET6
2347         if (fam == AF_INET6) {
2348                 /* ok to use deprecated addresses? */
2349                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2350                         return (NULL);
2351                 }
2352                 if (ifa->src_is_priv) {
2353                         /* Special case, linklocal to loop */
2354                         if (dest_is_loop)
2355                                 return (NULL);
2356                 }
2357         }
2358 #endif
2359         /*
2360          * Now that we know what is what, implement our table. This could in
2361          * theory be done slicker (it used to be), but this is
2362          * straightforward and easier to validate :-)
2363          */
2364         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2365             ifa->src_is_loop,
2366             dest_is_priv);
2367         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2368                 return (NULL);
2369         }
2370         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2371             ifa->src_is_loop,
2372             dest_is_global);
2373         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2374                 return (NULL);
2375         }
2376         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2377         /* its an acceptable address */
2378         return (ifa);
2379 }
2380
2381 int
2382 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2383 {
2384         struct sctp_laddr *laddr;
2385
2386         if (stcb == NULL) {
2387                 /* There are no restrictions, no TCB :-) */
2388                 return (0);
2389         }
2390         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2391                 if (laddr->ifa == NULL) {
2392                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2393                             __FUNCTION__);
2394                         continue;
2395                 }
2396                 if (laddr->ifa == ifa) {
2397                         /* Yes it is on the list */
2398                         return (1);
2399                 }
2400         }
2401         return (0);
2402 }
2403
2404
2405 int
2406 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2407 {
2408         struct sctp_laddr *laddr;
2409
2410         if (ifa == NULL)
2411                 return (0);
2412         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2413                 if (laddr->ifa == NULL) {
2414                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2415                             __FUNCTION__);
2416                         continue;
2417                 }
2418                 if ((laddr->ifa == ifa) && laddr->action == 0)
2419                         /* same pointer */
2420                         return (1);
2421         }
2422         return (0);
2423 }
2424
2425
2426
2427 static struct sctp_ifa *
2428 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2429     sctp_route_t * ro,
2430     uint32_t vrf_id,
2431     int non_asoc_addr_ok,
2432     uint8_t dest_is_priv,
2433     uint8_t dest_is_loop,
2434     sa_family_t fam)
2435 {
2436         struct sctp_laddr *laddr, *starting_point;
2437         void *ifn;
2438         int resettotop = 0;
2439         struct sctp_ifn *sctp_ifn;
2440         struct sctp_ifa *sctp_ifa, *sifa;
2441         struct sctp_vrf *vrf;
2442         uint32_t ifn_index;
2443
2444         vrf = sctp_find_vrf(vrf_id);
2445         if (vrf == NULL)
2446                 return (NULL);
2447
2448         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2449         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2450         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2451         /*
2452          * first question, is the ifn we will emit on in our list, if so, we
2453          * want such an address. Note that we first looked for a preferred
2454          * address.
2455          */
2456         if (sctp_ifn) {
2457                 /* is a preferred one on the interface we route out? */
2458                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2459                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2460                             (non_asoc_addr_ok == 0))
2461                                 continue;
2462                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2463                             dest_is_loop,
2464                             dest_is_priv, fam);
2465                         if (sifa == NULL)
2466                                 continue;
2467                         if (sctp_is_addr_in_ep(inp, sifa)) {
2468                                 atomic_add_int(&sifa->refcount, 1);
2469                                 return (sifa);
2470                         }
2471                 }
2472         }
2473         /*
2474          * ok, now we now need to find one on the list of the addresses. We
2475          * can't get one on the emitting interface so let's find first a
2476          * preferred one. If not that an acceptable one otherwise... we
2477          * return NULL.
2478          */
2479         starting_point = inp->next_addr_touse;
2480 once_again:
2481         if (inp->next_addr_touse == NULL) {
2482                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2483                 resettotop = 1;
2484         }
2485         for (laddr = inp->next_addr_touse; laddr;
2486             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2487                 if (laddr->ifa == NULL) {
2488                         /* address has been removed */
2489                         continue;
2490                 }
2491                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2492                         /* address is being deleted */
2493                         continue;
2494                 }
2495                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2496                     dest_is_priv, fam);
2497                 if (sifa == NULL)
2498                         continue;
2499                 atomic_add_int(&sifa->refcount, 1);
2500                 return (sifa);
2501         }
2502         if (resettotop == 0) {
2503                 inp->next_addr_touse = NULL;
2504                 goto once_again;
2505         }
2506         inp->next_addr_touse = starting_point;
2507         resettotop = 0;
2508 once_again_too:
2509         if (inp->next_addr_touse == NULL) {
2510                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2511                 resettotop = 1;
2512         }
2513         /* ok, what about an acceptable address in the inp */
2514         for (laddr = inp->next_addr_touse; laddr;
2515             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2516                 if (laddr->ifa == NULL) {
2517                         /* address has been removed */
2518                         continue;
2519                 }
2520                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2521                         /* address is being deleted */
2522                         continue;
2523                 }
2524                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2525                     dest_is_priv, fam);
2526                 if (sifa == NULL)
2527                         continue;
2528                 atomic_add_int(&sifa->refcount, 1);
2529                 return (sifa);
2530         }
2531         if (resettotop == 0) {
2532                 inp->next_addr_touse = NULL;
2533                 goto once_again_too;
2534         }
2535         /*
2536          * no address bound can be a source for the destination we are in
2537          * trouble
2538          */
2539         return (NULL);
2540 }
2541
2542
2543
2544 static struct sctp_ifa *
2545 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2546     struct sctp_tcb *stcb,
2547     sctp_route_t * ro,
2548     uint32_t vrf_id,
2549     uint8_t dest_is_priv,
2550     uint8_t dest_is_loop,
2551     int non_asoc_addr_ok,
2552     sa_family_t fam)
2553 {
2554         struct sctp_laddr *laddr, *starting_point;
2555         void *ifn;
2556         struct sctp_ifn *sctp_ifn;
2557         struct sctp_ifa *sctp_ifa, *sifa;
2558         uint8_t start_at_beginning = 0;
2559         struct sctp_vrf *vrf;
2560         uint32_t ifn_index;
2561
2562         /*
2563          * first question, is the ifn we will emit on in our list, if so, we
2564          * want that one.
2565          */
2566         vrf = sctp_find_vrf(vrf_id);
2567         if (vrf == NULL)
2568                 return (NULL);
2569
2570         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2571         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2572         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2573
2574         /*
2575          * first question, is the ifn we will emit on in our list?  If so,
2576          * we want that one. First we look for a preferred. Second, we go
2577          * for an acceptable.
2578          */
2579         if (sctp_ifn) {
2580                 /* first try for a preferred address on the ep */
2581                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2582                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2583                                 continue;
2584                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2585                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2586                                 if (sifa == NULL)
2587                                         continue;
2588                                 if (((non_asoc_addr_ok == 0) &&
2589                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2590                                     (non_asoc_addr_ok &&
2591                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2592                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2593                                         /* on the no-no list */
2594                                         continue;
2595                                 }
2596                                 atomic_add_int(&sifa->refcount, 1);
2597                                 return (sifa);
2598                         }
2599                 }
2600                 /* next try for an acceptable address on the ep */
2601                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2602                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2603                                 continue;
2604                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2605                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2606                                 if (sifa == NULL)
2607                                         continue;
2608                                 if (((non_asoc_addr_ok == 0) &&
2609                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2610                                     (non_asoc_addr_ok &&
2611                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2612                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2613                                         /* on the no-no list */
2614                                         continue;
2615                                 }
2616                                 atomic_add_int(&sifa->refcount, 1);
2617                                 return (sifa);
2618                         }
2619                 }
2620
2621         }
2622         /*
2623          * if we can't find one like that then we must look at all addresses
2624          * bound to pick one at first preferable then secondly acceptable.
2625          */
2626         starting_point = stcb->asoc.last_used_address;
2627 sctp_from_the_top:
2628         if (stcb->asoc.last_used_address == NULL) {
2629                 start_at_beginning = 1;
2630                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2631         }
2632         /* search beginning with the last used address */
2633         for (laddr = stcb->asoc.last_used_address; laddr;
2634             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2635                 if (laddr->ifa == NULL) {
2636                         /* address has been removed */
2637                         continue;
2638                 }
2639                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2640                         /* address is being deleted */
2641                         continue;
2642                 }
2643                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2644                 if (sifa == NULL)
2645                         continue;
2646                 if (((non_asoc_addr_ok == 0) &&
2647                     (sctp_is_addr_restricted(stcb, sifa))) ||
2648                     (non_asoc_addr_ok &&
2649                     (sctp_is_addr_restricted(stcb, sifa)) &&
2650                     (!sctp_is_addr_pending(stcb, sifa)))) {
2651                         /* on the no-no list */
2652                         continue;
2653                 }
2654                 stcb->asoc.last_used_address = laddr;
2655                 atomic_add_int(&sifa->refcount, 1);
2656                 return (sifa);
2657         }
2658         if (start_at_beginning == 0) {
2659                 stcb->asoc.last_used_address = NULL;
2660                 goto sctp_from_the_top;
2661         }
2662         /* now try for any higher scope than the destination */
2663         stcb->asoc.last_used_address = starting_point;
2664         start_at_beginning = 0;
2665 sctp_from_the_top2:
2666         if (stcb->asoc.last_used_address == NULL) {
2667                 start_at_beginning = 1;
2668                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2669         }
2670         /* search beginning with the last used address */
2671         for (laddr = stcb->asoc.last_used_address; laddr;
2672             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2673                 if (laddr->ifa == NULL) {
2674                         /* address has been removed */
2675                         continue;
2676                 }
2677                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2678                         /* address is being deleted */
2679                         continue;
2680                 }
2681                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2682                     dest_is_priv, fam);
2683                 if (sifa == NULL)
2684                         continue;
2685                 if (((non_asoc_addr_ok == 0) &&
2686                     (sctp_is_addr_restricted(stcb, sifa))) ||
2687                     (non_asoc_addr_ok &&
2688                     (sctp_is_addr_restricted(stcb, sifa)) &&
2689                     (!sctp_is_addr_pending(stcb, sifa)))) {
2690                         /* on the no-no list */
2691                         continue;
2692                 }
2693                 stcb->asoc.last_used_address = laddr;
2694                 atomic_add_int(&sifa->refcount, 1);
2695                 return (sifa);
2696         }
2697         if (start_at_beginning == 0) {
2698                 stcb->asoc.last_used_address = NULL;
2699                 goto sctp_from_the_top2;
2700         }
2701         return (NULL);
2702 }
2703
2704 static struct sctp_ifa *
2705 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2706     struct sctp_tcb *stcb,
2707     int non_asoc_addr_ok,
2708     uint8_t dest_is_loop,
2709     uint8_t dest_is_priv,
2710     int addr_wanted,
2711     sa_family_t fam,
2712     sctp_route_t * ro
2713 )
2714 {
2715         struct sctp_ifa *ifa, *sifa;
2716         int num_eligible_addr = 0;
2717
2718 #ifdef INET6
2719         struct sockaddr_in6 sin6, lsa6;
2720
2721         if (fam == AF_INET6) {
2722                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2723                 (void)sa6_recoverscope(&sin6);
2724         }
2725 #endif                          /* INET6 */
2726         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2727                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2728                     (non_asoc_addr_ok == 0))
2729                         continue;
2730                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2731                     dest_is_priv, fam);
2732                 if (sifa == NULL)
2733                         continue;
2734 #ifdef INET6
2735                 if (fam == AF_INET6 &&
2736                     dest_is_loop &&
2737                     sifa->src_is_loop && sifa->src_is_priv) {
2738                         /*
2739                          * don't allow fe80::1 to be a src on loop ::1, we
2740                          * don't list it to the peer so we will get an
2741                          * abort.
2742                          */
2743                         continue;
2744                 }
2745                 if (fam == AF_INET6 &&
2746                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2747                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2748                         /*
2749                          * link-local <-> link-local must belong to the same
2750                          * scope.
2751                          */
2752                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2753                         (void)sa6_recoverscope(&lsa6);
2754                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2755                                 continue;
2756                         }
2757                 }
2758 #endif                          /* INET6 */
2759
2760                 /*
2761                  * Check if the IPv6 address matches to next-hop. In the
2762                  * mobile case, old IPv6 address may be not deleted from the
2763                  * interface. Then, the interface has previous and new
2764                  * addresses.  We should use one corresponding to the
2765                  * next-hop.  (by micchie)
2766                  */
2767 #ifdef INET6
2768                 if (stcb && fam == AF_INET6 &&
2769                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2770                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2771                             == 0) {
2772                                 continue;
2773                         }
2774                 }
2775 #endif
2776 #ifdef INET
2777                 /* Avoid topologically incorrect IPv4 address */
2778                 if (stcb && fam == AF_INET &&
2779                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2780                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2781                                 continue;
2782                         }
2783                 }
2784 #endif
2785                 if (stcb) {
2786                         if (sctp_is_address_in_scope(ifa,
2787                             stcb->asoc.ipv4_addr_legal,
2788                             stcb->asoc.ipv6_addr_legal,
2789                             stcb->asoc.loopback_scope,
2790                             stcb->asoc.ipv4_local_scope,
2791                             stcb->asoc.local_scope,
2792                             stcb->asoc.site_scope, 0) == 0) {
2793                                 continue;
2794                         }
2795                         if (((non_asoc_addr_ok == 0) &&
2796                             (sctp_is_addr_restricted(stcb, sifa))) ||
2797                             (non_asoc_addr_ok &&
2798                             (sctp_is_addr_restricted(stcb, sifa)) &&
2799                             (!sctp_is_addr_pending(stcb, sifa)))) {
2800                                 /*
2801                                  * It is restricted for some reason..
2802                                  * probably not yet added.
2803                                  */
2804                                 continue;
2805                         }
2806                 }
2807                 if (num_eligible_addr >= addr_wanted) {
2808                         return (sifa);
2809                 }
2810                 num_eligible_addr++;
2811         }
2812         return (NULL);
2813 }
2814
2815
2816 static int
2817 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2818     struct sctp_tcb *stcb,
2819     int non_asoc_addr_ok,
2820     uint8_t dest_is_loop,
2821     uint8_t dest_is_priv,
2822     sa_family_t fam)
2823 {
2824         struct sctp_ifa *ifa, *sifa;
2825         int num_eligible_addr = 0;
2826
2827         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2828                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2829                     (non_asoc_addr_ok == 0)) {
2830                         continue;
2831                 }
2832                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2833                     dest_is_priv, fam);
2834                 if (sifa == NULL) {
2835                         continue;
2836                 }
2837                 if (stcb) {
2838                         if (sctp_is_address_in_scope(ifa,
2839                             stcb->asoc.ipv4_addr_legal,
2840                             stcb->asoc.ipv6_addr_legal,
2841                             stcb->asoc.loopback_scope,
2842                             stcb->asoc.ipv4_local_scope,
2843                             stcb->asoc.local_scope,
2844                             stcb->asoc.site_scope, 0) == 0) {
2845                                 continue;
2846                         }
2847                         if (((non_asoc_addr_ok == 0) &&
2848                             (sctp_is_addr_restricted(stcb, sifa))) ||
2849                             (non_asoc_addr_ok &&
2850                             (sctp_is_addr_restricted(stcb, sifa)) &&
2851                             (!sctp_is_addr_pending(stcb, sifa)))) {
2852                                 /*
2853                                  * It is restricted for some reason..
2854                                  * probably not yet added.
2855                                  */
2856                                 continue;
2857                         }
2858                 }
2859                 num_eligible_addr++;
2860         }
2861         return (num_eligible_addr);
2862 }
2863
2864 static struct sctp_ifa *
2865 sctp_choose_boundall(struct sctp_tcb *stcb,
2866     struct sctp_nets *net,
2867     sctp_route_t * ro,
2868     uint32_t vrf_id,
2869     uint8_t dest_is_priv,
2870     uint8_t dest_is_loop,
2871     int non_asoc_addr_ok,
2872     sa_family_t fam)
2873 {
2874         int cur_addr_num = 0, num_preferred = 0;
2875         void *ifn;
2876         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2877         struct sctp_ifa *sctp_ifa, *sifa;
2878         uint32_t ifn_index;
2879         struct sctp_vrf *vrf;
2880
2881 #ifdef INET
2882         int retried = 0;
2883
2884 #endif
2885
2886         /*-
2887          * For boundall we can use any address in the association.
2888          * If non_asoc_addr_ok is set we can use any address (at least in
2889          * theory). So we look for preferred addresses first. If we find one,
2890          * we use it. Otherwise we next try to get an address on the
2891          * interface, which we should be able to do (unless non_asoc_addr_ok
2892          * is false and we are routed out that way). In these cases where we
2893          * can't use the address of the interface we go through all the
2894          * ifn's looking for an address we can use and fill that in. Punting
2895          * means we send back address 0, which will probably cause problems
2896          * actually since then IP will fill in the address of the route ifn,
2897          * which means we probably already rejected it.. i.e. here comes an
2898          * abort :-<.
2899          */
2900         vrf = sctp_find_vrf(vrf_id);
2901         if (vrf == NULL)
2902                 return (NULL);
2903
2904         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2905         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2906         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2907         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2908         if (sctp_ifn == NULL) {
2909                 /* ?? We don't have this guy ?? */
2910                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2911                 goto bound_all_plan_b;
2912         }
2913         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2914             ifn_index, sctp_ifn->ifn_name);
2915
2916         if (net) {
2917                 cur_addr_num = net->indx_of_eligible_next_to_use;
2918         }
2919         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2920             stcb,
2921             non_asoc_addr_ok,
2922             dest_is_loop,
2923             dest_is_priv, fam);
2924         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2925             num_preferred, sctp_ifn->ifn_name);
2926         if (num_preferred == 0) {
2927                 /*
2928                  * no eligible addresses, we must use some other interface
2929                  * address if we can find one.
2930                  */
2931                 goto bound_all_plan_b;
2932         }
2933         /*
2934          * Ok we have num_eligible_addr set with how many we can use, this
2935          * may vary from call to call due to addresses being deprecated
2936          * etc..
2937          */
2938         if (cur_addr_num >= num_preferred) {
2939                 cur_addr_num = 0;
2940         }
2941         /*
2942          * select the nth address from the list (where cur_addr_num is the
2943          * nth) and 0 is the first one, 1 is the second one etc...
2944          */
2945         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2946
2947         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2948             dest_is_priv, cur_addr_num, fam, ro);
2949
2950         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2951         if (sctp_ifa) {
2952                 atomic_add_int(&sctp_ifa->refcount, 1);
2953                 if (net) {
2954                         /* save off where the next one we will want */
2955                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2956                 }
2957                 return (sctp_ifa);
2958         }
2959         /*
2960          * plan_b: Look at all interfaces and find a preferred address. If
2961          * no preferred fall through to plan_c.
2962          */
2963 bound_all_plan_b:
2964         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2965         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2966                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2967                     sctp_ifn->ifn_name);
2968                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2969                         /* wrong base scope */
2970                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2971                         continue;
2972                 }
2973                 if ((sctp_ifn == looked_at) && looked_at) {
2974                         /* already looked at this guy */
2975                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2976                         continue;
2977                 }
2978                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2979                     dest_is_loop, dest_is_priv, fam);
2980                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2981                     "Found ifn:%p %d preferred source addresses\n",
2982                     ifn, num_preferred);
2983                 if (num_preferred == 0) {
2984                         /* None on this interface. */
2985                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2986                         continue;
2987                 }
2988                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2989                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2990                     num_preferred, sctp_ifn, cur_addr_num);
2991
2992                 /*
2993                  * Ok we have num_eligible_addr set with how many we can
2994                  * use, this may vary from call to call due to addresses
2995                  * being deprecated etc..
2996                  */
2997                 if (cur_addr_num >= num_preferred) {
2998                         cur_addr_num = 0;
2999                 }
3000                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
3001                     dest_is_priv, cur_addr_num, fam, ro);
3002                 if (sifa == NULL)
3003                         continue;
3004                 if (net) {
3005                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3006                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3007                             cur_addr_num);
3008                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3009                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3010                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3011                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3012                 }
3013                 atomic_add_int(&sifa->refcount, 1);
3014                 return (sifa);
3015         }
3016 #ifdef INET
3017 again_with_private_addresses_allowed:
3018 #endif
3019         /* plan_c: do we have an acceptable address on the emit interface */
3020         sifa = NULL;
3021         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3022         if (emit_ifn == NULL) {
3023                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3024                 goto plan_d;
3025         }
3026         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3027                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3028                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3029                     (non_asoc_addr_ok == 0)) {
3030                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3031                         continue;
3032                 }
3033                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3034                     dest_is_priv, fam);
3035                 if (sifa == NULL) {
3036                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3037                         continue;
3038                 }
3039                 if (stcb) {
3040                         if (sctp_is_address_in_scope(sifa,
3041                             stcb->asoc.ipv4_addr_legal,
3042                             stcb->asoc.ipv6_addr_legal,
3043                             stcb->asoc.loopback_scope,
3044                             stcb->asoc.ipv4_local_scope,
3045                             stcb->asoc.local_scope,
3046                             stcb->asoc.site_scope, 0) == 0) {
3047                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3048                                 sifa = NULL;
3049                                 continue;
3050                         }
3051                         if (((non_asoc_addr_ok == 0) &&
3052                             (sctp_is_addr_restricted(stcb, sifa))) ||
3053                             (non_asoc_addr_ok &&
3054                             (sctp_is_addr_restricted(stcb, sifa)) &&
3055                             (!sctp_is_addr_pending(stcb, sifa)))) {
3056                                 /*
3057                                  * It is restricted for some reason..
3058                                  * probably not yet added.
3059                                  */
3060                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3061                                 sifa = NULL;
3062                                 continue;
3063                         }
3064                 } else {
3065                         SCTP_PRINTF("Stcb is null - no print\n");
3066                 }
3067                 atomic_add_int(&sifa->refcount, 1);
3068                 goto out;
3069         }
3070 plan_d:
3071         /*
3072          * plan_d: We are in trouble. No preferred address on the emit
3073          * interface. And not even a preferred address on all interfaces. Go
3074          * out and see if we can find an acceptable address somewhere
3075          * amongst all interfaces.
3076          */
3077         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3078         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3079                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3080                         /* wrong base scope */
3081                         continue;
3082                 }
3083                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3084                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3085                             (non_asoc_addr_ok == 0))
3086                                 continue;
3087                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3088                             dest_is_loop,
3089                             dest_is_priv, fam);
3090                         if (sifa == NULL)
3091                                 continue;
3092                         if (stcb) {
3093                                 if (sctp_is_address_in_scope(sifa,
3094                                     stcb->asoc.ipv4_addr_legal,
3095                                     stcb->asoc.ipv6_addr_legal,
3096                                     stcb->asoc.loopback_scope,
3097                                     stcb->asoc.ipv4_local_scope,
3098                                     stcb->asoc.local_scope,
3099                                     stcb->asoc.site_scope, 0) == 0) {
3100                                         sifa = NULL;
3101                                         continue;
3102                                 }
3103                                 if (((non_asoc_addr_ok == 0) &&
3104                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3105                                     (non_asoc_addr_ok &&
3106                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3107                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3108                                         /*
3109                                          * It is restricted for some
3110                                          * reason.. probably not yet added.
3111                                          */
3112                                         sifa = NULL;
3113                                         continue;
3114                                 }
3115                         }
3116                         goto out;
3117                 }
3118         }
3119 #ifdef INET
3120         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3121                 stcb->asoc.ipv4_local_scope = 1;
3122                 retried = 1;
3123                 goto again_with_private_addresses_allowed;
3124         } else if (retried == 1) {
3125                 stcb->asoc.ipv4_local_scope = 0;
3126         }
3127 #endif
3128 out:
3129 #ifdef INET
3130         if (sifa) {
3131                 if (retried == 1) {
3132                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3133                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3134                                         /* wrong base scope */
3135                                         continue;
3136                                 }
3137                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3138                                         struct sctp_ifa *tmp_sifa;
3139
3140                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3141                                             (non_asoc_addr_ok == 0))
3142                                                 continue;
3143                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3144                                             dest_is_loop,
3145                                             dest_is_priv, fam);
3146                                         if (tmp_sifa == NULL) {
3147                                                 continue;
3148                                         }
3149                                         if (tmp_sifa == sifa) {
3150                                                 continue;
3151                                         }
3152                                         if (stcb) {
3153                                                 if (sctp_is_address_in_scope(tmp_sifa,
3154                                                     stcb->asoc.ipv4_addr_legal,
3155                                                     stcb->asoc.ipv6_addr_legal,
3156                                                     stcb->asoc.loopback_scope,
3157                                                     stcb->asoc.ipv4_local_scope,
3158                                                     stcb->asoc.local_scope,
3159                                                     stcb->asoc.site_scope, 0) == 0) {
3160                                                         continue;
3161                                                 }
3162                                                 if (((non_asoc_addr_ok == 0) &&
3163                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3164                                                     (non_asoc_addr_ok &&
3165                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3166                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3167                                                         /*
3168                                                          * It is restricted
3169                                                          * for some reason..
3170                                                          * probably not yet
3171                                                          * added.
3172                                                          */
3173                                                         continue;
3174                                                 }
3175                                         }
3176                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3177                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3178                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3179                                         }
3180                                 }
3181                         }
3182                 }
3183                 atomic_add_int(&sifa->refcount, 1);
3184         }
3185 #endif
3186         return (sifa);
3187 }
3188
3189
3190
3191 /* tcb may be NULL */
3192 struct sctp_ifa *
3193 sctp_source_address_selection(struct sctp_inpcb *inp,
3194     struct sctp_tcb *stcb,
3195     sctp_route_t * ro,
3196     struct sctp_nets *net,
3197     int non_asoc_addr_ok, uint32_t vrf_id)
3198 {
3199         struct sctp_ifa *answer;
3200         uint8_t dest_is_priv, dest_is_loop;
3201         sa_family_t fam;
3202
3203 #ifdef INET
3204         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3205
3206 #endif
3207 #ifdef INET6
3208         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3209
3210 #endif
3211
3212         /**
3213          * Rules: - Find the route if needed, cache if I can. - Look at
3214          * interface address in route, Is it in the bound list. If so we
3215          * have the best source. - If not we must rotate amongst the
3216          * addresses.
3217          *
3218          * Cavets and issues
3219          *
3220          * Do we need to pay attention to scope. We can have a private address
3221          * or a global address we are sourcing or sending to. So if we draw
3222          * it out
3223          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3224          * For V4
3225          * ------------------------------------------
3226          *      source     *      dest  *  result
3227          * -----------------------------------------
3228          * <a>  Private    *    Global  *  NAT
3229          * -----------------------------------------
3230          * <b>  Private    *    Private *  No problem
3231          * -----------------------------------------
3232          * <c>  Global     *    Private *  Huh, How will this work?
3233          * -----------------------------------------
3234          * <d>  Global     *    Global  *  No Problem
3235          *------------------------------------------
3236          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3237          * For V6
3238          *------------------------------------------
3239          *      source     *      dest  *  result
3240          * -----------------------------------------
3241          * <a>  Linklocal  *    Global  *
3242          * -----------------------------------------
3243          * <b>  Linklocal  * Linklocal  *  No problem
3244          * -----------------------------------------
3245          * <c>  Global     * Linklocal  *  Huh, How will this work?
3246          * -----------------------------------------
3247          * <d>  Global     *    Global  *  No Problem
3248          *------------------------------------------
3249          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3250          *
3251          * And then we add to that what happens if there are multiple addresses
3252          * assigned to an interface. Remember the ifa on a ifn is a linked
3253          * list of addresses. So one interface can have more than one IP
3254          * address. What happens if we have both a private and a global
3255          * address? Do we then use context of destination to sort out which
3256          * one is best? And what about NAT's sending P->G may get you a NAT
3257          * translation, or should you select the G thats on the interface in
3258          * preference.
3259          *
3260          * Decisions:
3261          *
3262          * - count the number of addresses on the interface.
3263          * - if it is one, no problem except case <c>.
3264          *   For <a> we will assume a NAT out there.
3265          * - if there are more than one, then we need to worry about scope P
3266          *   or G. We should prefer G -> G and P -> P if possible.
3267          *   Then as a secondary fall back to mixed types G->P being a last
3268          *   ditch one.
3269          * - The above all works for bound all, but bound specific we need to
3270          *   use the same concept but instead only consider the bound
3271          *   addresses. If the bound set is NOT assigned to the interface then
3272          *   we must use rotation amongst the bound addresses..
3273          */
3274         if (ro->ro_rt == NULL) {
3275                 /*
3276                  * Need a route to cache.
3277                  */
3278                 SCTP_RTALLOC(ro, vrf_id);
3279         }
3280         if (ro->ro_rt == NULL) {
3281                 return (NULL);
3282         }
3283         fam = ro->ro_dst.sa_family;
3284         dest_is_priv = dest_is_loop = 0;
3285         /* Setup our scopes for the destination */
3286         switch (fam) {
3287 #ifdef INET
3288         case AF_INET:
3289                 /* Scope based on outbound address */
3290                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3291                         dest_is_loop = 1;
3292                         if (net != NULL) {
3293                                 /* mark it as local */
3294                                 net->addr_is_local = 1;
3295                         }
3296                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3297                         dest_is_priv = 1;
3298                 }
3299                 break;
3300 #endif
3301 #ifdef INET6
3302         case AF_INET6:
3303                 /* Scope based on outbound address */
3304                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3305                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3306                         /*
3307                          * If the address is a loopback address, which
3308                          * consists of "::1" OR "fe80::1%lo0", we are
3309                          * loopback scope. But we don't use dest_is_priv
3310                          * (link local addresses).
3311                          */
3312                         dest_is_loop = 1;
3313                         if (net != NULL) {
3314                                 /* mark it as local */
3315                                 net->addr_is_local = 1;
3316                         }
3317                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3318                         dest_is_priv = 1;
3319                 }
3320                 break;
3321 #endif
3322         }
3323         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3324         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3325         SCTP_IPI_ADDR_RLOCK();
3326         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3327                 /*
3328                  * Bound all case
3329                  */
3330                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3331                     dest_is_priv, dest_is_loop,
3332                     non_asoc_addr_ok, fam);
3333                 SCTP_IPI_ADDR_RUNLOCK();
3334                 return (answer);
3335         }
3336         /*
3337          * Subset bound case
3338          */
3339         if (stcb) {
3340                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3341                     vrf_id, dest_is_priv,
3342                     dest_is_loop,
3343                     non_asoc_addr_ok, fam);
3344         } else {
3345                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3346                     non_asoc_addr_ok,
3347                     dest_is_priv,
3348                     dest_is_loop, fam);
3349         }
3350         SCTP_IPI_ADDR_RUNLOCK();
3351         return (answer);
3352 }
3353
3354 static int
3355 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3356 {
3357         struct cmsghdr cmh;
3358         int tlen, at, found;
3359         struct sctp_sndinfo sndinfo;
3360         struct sctp_prinfo prinfo;
3361         struct sctp_authinfo authinfo;
3362
3363         tlen = SCTP_BUF_LEN(control);
3364         at = 0;
3365         found = 0;
3366         /*
3367          * Independent of how many mbufs, find the c_type inside the control
3368          * structure and copy out the data.
3369          */
3370         while (at < tlen) {
3371                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3372                         /* There is not enough room for one more. */
3373                         return (found);
3374                 }
3375                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3376                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3377                         /* We dont't have a complete CMSG header. */
3378                         return (found);
3379                 }
3380                 if (((int)cmh.cmsg_len + at) > tlen) {
3381                         /* We don't have the complete CMSG. */
3382                         return (found);
3383                 }
3384                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3385                     ((c_type == cmh.cmsg_type) ||
3386                     ((c_type == SCTP_SNDRCV) &&
3387                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3388                     (cmh.cmsg_type == SCTP_PRINFO) ||
3389                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3390                         if (c_type == cmh.cmsg_type) {
3391                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3392                                         return (found);
3393                                 }
3394                                 /* It is exactly what we want. Copy it out. */
3395                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3396                                 return (1);
3397                         } else {
3398                                 struct sctp_sndrcvinfo *sndrcvinfo;
3399
3400                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3401                                 if (found == 0) {
3402                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3403                                                 return (found);
3404                                         }
3405                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3406                                 }
3407                                 switch (cmh.cmsg_type) {
3408                                 case SCTP_SNDINFO:
3409                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3410                                                 return (found);
3411                                         }
3412                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3413                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3414                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3415                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3416                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3417                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3418                                         break;
3419                                 case SCTP_PRINFO:
3420                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3421                                                 return (found);
3422                                         }
3423                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3424                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3425                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3426                                         break;
3427                                 case SCTP_AUTHINFO:
3428                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3429                                                 return (found);
3430                                         }
3431                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3432                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3433                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3434                                         break;
3435                                 default:
3436                                         return (found);
3437                                 }
3438                                 found = 1;
3439                         }
3440                 }
3441                 at += CMSG_ALIGN(cmh.cmsg_len);
3442         }
3443         return (found);
3444 }
3445
3446 static int
3447 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3448 {
3449         struct cmsghdr cmh;
3450         int tlen, at;
3451         struct sctp_initmsg initmsg;
3452
3453 #ifdef INET
3454         struct sockaddr_in sin;
3455
3456 #endif
3457 #ifdef INET6
3458         struct sockaddr_in6 sin6;
3459
3460 #endif
3461
3462         tlen = SCTP_BUF_LEN(control);
3463         at = 0;
3464         while (at < tlen) {
3465                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3466                         /* There is not enough room for one more. */
3467                         *error = EINVAL;
3468                         return (1);
3469                 }
3470                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3471                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3472                         /* We dont't have a complete CMSG header. */
3473                         *error = EINVAL;
3474                         return (1);
3475                 }
3476                 if (((int)cmh.cmsg_len + at) > tlen) {
3477                         /* We don't have the complete CMSG. */
3478                         *error = EINVAL;
3479                         return (1);
3480                 }
3481                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3482                         switch (cmh.cmsg_type) {
3483                         case SCTP_INIT:
3484                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3485                                         *error = EINVAL;
3486                                         return (1);
3487                                 }
3488                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3489                                 if (initmsg.sinit_max_attempts)
3490                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3491                                 if (initmsg.sinit_num_ostreams)
3492                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3493                                 if (initmsg.sinit_max_instreams)
3494                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3495                                 if (initmsg.sinit_max_init_timeo)
3496                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3497                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3498                                         struct sctp_stream_out *tmp_str;
3499                                         unsigned int i;
3500
3501                                         /* Default is NOT correct */
3502                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3503                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3504                                         SCTP_TCB_UNLOCK(stcb);
3505                                         SCTP_MALLOC(tmp_str,
3506                                             struct sctp_stream_out *,
3507                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3508                                             SCTP_M_STRMO);
3509                                         SCTP_TCB_LOCK(stcb);
3510                                         if (tmp_str != NULL) {
3511                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3512                                                 stcb->asoc.strmout = tmp_str;
3513                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3514                                         } else {
3515                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3516                                         }
3517                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3518                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3519                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3520                                                 stcb->asoc.strmout[i].stream_no = i;
3521                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3522                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3523                                         }
3524                                 }
3525                                 break;
3526 #ifdef INET
3527                         case SCTP_DSTADDRV4:
3528                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3529                                         *error = EINVAL;
3530                                         return (1);
3531                                 }
3532                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3533                                 sin.sin_family = AF_INET;
3534                                 sin.sin_len = sizeof(struct sockaddr_in);
3535                                 sin.sin_port = stcb->rport;
3536                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3537                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3538                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3539                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3540                                         *error = EINVAL;
3541                                         return (1);
3542                                 }
3543                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3544                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3545                                         *error = ENOBUFS;
3546                                         return (1);
3547                                 }
3548                                 break;
3549 #endif
3550 #ifdef INET6
3551                         case SCTP_DSTADDRV6:
3552                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3553                                         *error = EINVAL;
3554                                         return (1);
3555                                 }
3556                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3557                                 sin6.sin6_family = AF_INET6;
3558                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3559                                 sin6.sin6_port = stcb->rport;
3560                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3561                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3562                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3563                                         *error = EINVAL;
3564                                         return (1);
3565                                 }
3566 #ifdef INET
3567                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3568                                         in6_sin6_2_sin(&sin, &sin6);
3569                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3570                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3571                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3572                                                 *error = EINVAL;
3573                                                 return (1);
3574                                         }
3575                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3576                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3577                                                 *error = ENOBUFS;
3578                                                 return (1);
3579                                         }
3580                                 } else
3581 #endif
3582                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3583                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3584                                         *error = ENOBUFS;
3585                                         return (1);
3586                                 }
3587                                 break;
3588 #endif
3589                         default:
3590                                 break;
3591                         }
3592                 }
3593                 at += CMSG_ALIGN(cmh.cmsg_len);
3594         }
3595         return (0);
3596 }
3597
3598 static struct sctp_tcb *
3599 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3600     in_port_t port,
3601     struct mbuf *control,
3602     struct sctp_nets **net_p,
3603     int *error)
3604 {
3605         struct cmsghdr cmh;
3606         int tlen, at;
3607         struct sctp_tcb *stcb;
3608         struct sockaddr *addr;
3609
3610 #ifdef INET
3611         struct sockaddr_in sin;
3612
3613 #endif
3614 #ifdef INET6
3615         struct sockaddr_in6 sin6;
3616
3617 #endif
3618
3619         tlen = SCTP_BUF_LEN(control);
3620         at = 0;
3621         while (at < tlen) {
3622                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3623                         /* There is not enough room for one more. */
3624                         *error = EINVAL;
3625                         return (NULL);
3626                 }
3627                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3628                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3629                         /* We dont't have a complete CMSG header. */
3630                         *error = EINVAL;
3631                         return (NULL);
3632                 }
3633                 if (((int)cmh.cmsg_len + at) > tlen) {
3634                         /* We don't have the complete CMSG. */
3635                         *error = EINVAL;
3636                         return (NULL);
3637                 }
3638                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3639                         switch (cmh.cmsg_type) {
3640 #ifdef INET
3641                         case SCTP_DSTADDRV4:
3642                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3643                                         *error = EINVAL;
3644                                         return (NULL);
3645                                 }
3646                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3647                                 sin.sin_family = AF_INET;
3648                                 sin.sin_len = sizeof(struct sockaddr_in);
3649                                 sin.sin_port = port;
3650                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3651                                 addr = (struct sockaddr *)&sin;
3652                                 break;
3653 #endif
3654 #ifdef INET6
3655                         case SCTP_DSTADDRV6:
3656                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3657                                         *error = EINVAL;
3658                                         return (NULL);
3659                                 }
3660                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3661                                 sin6.sin6_family = AF_INET6;
3662                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3663                                 sin6.sin6_port = port;
3664                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3665 #ifdef INET
3666                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3667                                         in6_sin6_2_sin(&sin, &sin6);
3668                                         addr = (struct sockaddr *)&sin;
3669                                 } else
3670 #endif
3671                                         addr = (struct sockaddr *)&sin6;
3672                                 break;
3673 #endif
3674                         default:
3675                                 addr = NULL;
3676                                 break;
3677                         }
3678                         if (addr) {
3679                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3680                                 if (stcb != NULL) {
3681                                         return (stcb);
3682                                 }
3683                         }
3684                 }
3685                 at += CMSG_ALIGN(cmh.cmsg_len);
3686         }
3687         return (NULL);
3688 }
3689
3690 static struct mbuf *
3691 sctp_add_cookie(struct mbuf *init, int init_offset,
3692     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3693 {
3694         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3695         struct sctp_state_cookie *stc;
3696         struct sctp_paramhdr *ph;
3697         uint8_t *foo;
3698         int sig_offset;
3699         uint16_t cookie_sz;
3700
3701         mret = NULL;
3702         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3703             sizeof(struct sctp_paramhdr)), 0,
3704             M_DONTWAIT, 1, MT_DATA);
3705         if (mret == NULL) {
3706                 return (NULL);
3707         }
3708         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3709         if (copy_init == NULL) {
3710                 sctp_m_freem(mret);
3711                 return (NULL);
3712         }
3713 #ifdef SCTP_MBUF_LOGGING
3714         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3715                 struct mbuf *mat;
3716
3717                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3718                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3719                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3720                         }
3721                 }
3722         }
3723 #endif
3724         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3725             M_DONTWAIT);
3726         if (copy_initack == NULL) {
3727                 sctp_m_freem(mret);
3728                 sctp_m_freem(copy_init);
3729                 return (NULL);
3730         }
3731 #ifdef SCTP_MBUF_LOGGING
3732         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3733                 struct mbuf *mat;
3734
3735                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3736                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3737                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3738                         }
3739                 }
3740         }
3741 #endif
3742         /* easy side we just drop it on the end */
3743         ph = mtod(mret, struct sctp_paramhdr *);
3744         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3745             sizeof(struct sctp_paramhdr);
3746         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3747             sizeof(struct sctp_paramhdr));
3748         ph->param_type = htons(SCTP_STATE_COOKIE);
3749         ph->param_length = 0;   /* fill in at the end */
3750         /* Fill in the stc cookie data */
3751         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3752
3753         /* tack the INIT and then the INIT-ACK onto the chain */
3754         cookie_sz = 0;
3755         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3756                 cookie_sz += SCTP_BUF_LEN(m_at);
3757                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3758                         SCTP_BUF_NEXT(m_at) = copy_init;
3759                         break;
3760                 }
3761         }
3762         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3763                 cookie_sz += SCTP_BUF_LEN(m_at);
3764                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3765                         SCTP_BUF_NEXT(m_at) = copy_initack;
3766                         break;
3767                 }
3768         }
3769         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3770                 cookie_sz += SCTP_BUF_LEN(m_at);
3771                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3772                         break;
3773                 }
3774         }
3775         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3776         if (sig == NULL) {
3777                 /* no space, so free the entire chain */
3778                 sctp_m_freem(mret);
3779                 return (NULL);
3780         }
3781         SCTP_BUF_LEN(sig) = 0;
3782         SCTP_BUF_NEXT(m_at) = sig;
3783         sig_offset = 0;
3784         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3785         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3786         *signature = foo;
3787         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3788         cookie_sz += SCTP_SIGNATURE_SIZE;
3789         ph->param_length = htons(cookie_sz);
3790         return (mret);
3791 }
3792
3793
3794 static uint8_t
3795 sctp_get_ect(struct sctp_tcb *stcb)
3796 {
3797         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3798                 return (SCTP_ECT0_BIT);
3799         } else {
3800                 return (0);
3801         }
3802 }
3803
3804 static void
3805 sctp_handle_no_route(struct sctp_tcb *stcb,
3806     struct sctp_nets *net,
3807     int so_locked)
3808 {
3809         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3810
3811         if (net) {
3812                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3813                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3814                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3815                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3816                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3817                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3818                                     stcb,
3819                                     SCTP_FAILED_THRESHOLD,
3820                                     (void *)net,
3821                                     so_locked);
3822                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3823                                 net->dest_state &= ~SCTP_ADDR_PF;
3824                         }
3825                 }
3826                 if (stcb) {
3827                         if (net == stcb->asoc.primary_destination) {
3828                                 /* need a new primary */
3829                                 struct sctp_nets *alt;
3830
3831                                 alt = sctp_find_alternate_net(stcb, net, 0);
3832                                 if (alt != net) {
3833                                         if (stcb->asoc.alternate) {
3834                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3835                                         }
3836                                         stcb->asoc.alternate = alt;
3837                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3838                                         if (net->ro._s_addr) {
3839                                                 sctp_free_ifa(net->ro._s_addr);
3840                                                 net->ro._s_addr = NULL;
3841                                         }
3842                                         net->src_addr_selected = 0;
3843                                 }
3844                         }
3845                 }
3846         }
3847 }
3848
3849 static int
3850 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3851     struct sctp_tcb *stcb,      /* may be NULL */
3852     struct sctp_nets *net,
3853     struct sockaddr *to,
3854     struct mbuf *m,
3855     uint32_t auth_offset,
3856     struct sctp_auth_chunk *auth,
3857     uint16_t auth_keyid,
3858     int nofragment_flag,
3859     int ecn_ok,
3860     int out_of_asoc_ok,
3861     uint16_t src_port,
3862     uint16_t dest_port,
3863     uint32_t v_tag,
3864     uint16_t port,
3865 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3866     int so_locked SCTP_UNUSED,
3867 #else
3868     int so_locked,
3869 #endif
3870     union sctp_sockstore *over_addr,
3871     struct mbuf *init
3872 )
3873 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3874 {
3875         /**
3876          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3877          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3878          * - fill in the HMAC digest of any AUTH chunk in the packet.
3879          * - calculate and fill in the SCTP checksum.
3880          * - prepend an IP address header.
3881          * - if boundall use INADDR_ANY.
3882          * - if boundspecific do source address selection.
3883          * - set fragmentation option for ipV4.
3884          * - On return from IP output, check/adjust mtu size of output
3885          *   interface and smallest_mtu size as well.
3886          */
3887         /* Will need ifdefs around this */
3888         struct mbuf *o_pak;
3889         struct mbuf *newm;
3890         struct sctphdr *sctphdr;
3891         int packet_length;
3892         int ret;
3893         uint32_t vrf_id;
3894         sctp_route_t *ro = NULL;
3895         struct udphdr *udp = NULL;
3896         uint8_t tos_value;
3897
3898 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3899         struct socket *so = NULL;
3900
3901 #endif
3902
3903         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3904                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3905                 sctp_m_freem(m);
3906                 return (EFAULT);
3907         }
3908         if (stcb) {
3909                 vrf_id = stcb->asoc.vrf_id;
3910         } else {
3911                 vrf_id = inp->def_vrf_id;
3912         }
3913
3914         /* fill in the HMAC digest for any AUTH chunk in the packet */
3915         if ((auth != NULL) && (stcb != NULL)) {
3916                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3917         }
3918         if (net) {
3919                 tos_value = net->dscp;
3920         } else if (stcb) {
3921                 tos_value = stcb->asoc.default_dscp;
3922         } else {
3923                 tos_value = inp->sctp_ep.default_dscp;
3924         }
3925
3926         switch (to->sa_family) {
3927 #ifdef INET
3928         case AF_INET:
3929                 {
3930                         struct ip *ip = NULL;
3931                         sctp_route_t iproute;
3932                         int len;
3933
3934                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3935                         if (port) {
3936                                 len += sizeof(struct udphdr);
3937                         }
3938                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3939                         if (newm == NULL) {
3940                                 sctp_m_freem(m);
3941                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3942                                 return (ENOMEM);
3943                         }
3944                         SCTP_ALIGN_TO_END(newm, len);
3945                         SCTP_BUF_LEN(newm) = len;
3946                         SCTP_BUF_NEXT(newm) = m;
3947                         m = newm;
3948                         if (net != NULL) {
3949 #ifdef INVARIANTS
3950                                 if (net->flowidset == 0) {
3951                                         panic("Flow ID not set");
3952                                 }
3953 #endif
3954                                 m->m_pkthdr.flowid = net->flowid;
3955                                 m->m_flags |= M_FLOWID;
3956                         } else {
3957                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3958                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3959                                         m->m_flags |= M_FLOWID;
3960                                 }
3961                         }
3962                         packet_length = sctp_calculate_len(m);
3963                         ip = mtod(m, struct ip *);
3964                         ip->ip_v = IPVERSION;
3965                         ip->ip_hl = (sizeof(struct ip) >> 2);
3966                         if (tos_value == 0) {
3967                                 /*
3968                                  * This means especially, that it is not set
3969                                  * at the SCTP layer. So use the value from
3970                                  * the IP layer.
3971                                  */
3972                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3973                         }
3974                         tos_value &= 0xfc;
3975                         if (ecn_ok) {
3976                                 tos_value |= sctp_get_ect(stcb);
3977                         }
3978                         if ((nofragment_flag) && (port == 0)) {
3979                                 ip->ip_off = IP_DF;
3980                         } else
3981                                 ip->ip_off = 0;
3982
3983                         /* FreeBSD has a function for ip_id's */
3984                         ip->ip_id = ip_newid();
3985
3986                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3987                         ip->ip_len = packet_length;
3988                         ip->ip_tos = tos_value;
3989                         if (port) {
3990                                 ip->ip_p = IPPROTO_UDP;
3991                         } else {
3992                                 ip->ip_p = IPPROTO_SCTP;
3993                         }
3994                         ip->ip_sum = 0;
3995                         if (net == NULL) {
3996                                 ro = &iproute;
3997                                 memset(&iproute, 0, sizeof(iproute));
3998                                 memcpy(&ro->ro_dst, to, to->sa_len);
3999                         } else {
4000                                 ro = (sctp_route_t *) & net->ro;
4001                         }
4002                         /* Now the address selection part */
4003                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4004
4005                         /* call the routine to select the src address */
4006                         if (net && out_of_asoc_ok == 0) {
4007                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4008                                         sctp_free_ifa(net->ro._s_addr);
4009                                         net->ro._s_addr = NULL;
4010                                         net->src_addr_selected = 0;
4011                                         if (ro->ro_rt) {
4012                                                 RTFREE(ro->ro_rt);
4013                                                 ro->ro_rt = NULL;
4014                                         }
4015                                 }
4016                                 if (net->src_addr_selected == 0) {
4017                                         /* Cache the source address */
4018                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4019                                             ro, net, 0,
4020                                             vrf_id);
4021                                         net->src_addr_selected = 1;
4022                                 }
4023                                 if (net->ro._s_addr == NULL) {
4024                                         /* No route to host */
4025                                         net->src_addr_selected = 0;
4026                                         sctp_handle_no_route(stcb, net, so_locked);
4027                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4028                                         sctp_m_freem(m);
4029                                         return (EHOSTUNREACH);
4030                                 }
4031                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4032                         } else {
4033                                 if (over_addr == NULL) {
4034                                         struct sctp_ifa *_lsrc;
4035
4036                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4037                                             net,
4038                                             out_of_asoc_ok,
4039                                             vrf_id);
4040                                         if (_lsrc == NULL) {
4041                                                 sctp_handle_no_route(stcb, net, so_locked);
4042                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4043                                                 sctp_m_freem(m);
4044                                                 return (EHOSTUNREACH);
4045                                         }
4046                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4047                                         sctp_free_ifa(_lsrc);
4048                                 } else {
4049                                         ip->ip_src = over_addr->sin.sin_addr;
4050                                         SCTP_RTALLOC(ro, vrf_id);
4051                                 }
4052                         }
4053                         if (port) {
4054                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4055                                         sctp_handle_no_route(stcb, net, so_locked);
4056                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4057                                         sctp_m_freem(m);
4058                                         return (EHOSTUNREACH);
4059                                 }
4060                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4061                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4062                                 udp->uh_dport = port;
4063                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4064                                 if (V_udp_cksum) {
4065                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4066                                 } else {
4067                                         udp->uh_sum = 0;
4068                                 }
4069                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4070                         } else {
4071                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4072                         }
4073
4074                         sctphdr->src_port = src_port;
4075                         sctphdr->dest_port = dest_port;
4076                         sctphdr->v_tag = v_tag;
4077                         sctphdr->checksum = 0;
4078
4079                         /*
4080                          * If source address selection fails and we find no
4081                          * route then the ip_output should fail as well with
4082                          * a NO_ROUTE_TO_HOST type error. We probably should
4083                          * catch that somewhere and abort the association
4084                          * right away (assuming this is an INIT being sent).
4085                          */
4086                         if (ro->ro_rt == NULL) {
4087                                 /*
4088                                  * src addr selection failed to find a route
4089                                  * (or valid source addr), so we can't get
4090                                  * there from here (yet)!
4091                                  */
4092                                 sctp_handle_no_route(stcb, net, so_locked);
4093                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4094                                 sctp_m_freem(m);
4095                                 return (EHOSTUNREACH);
4096                         }
4097                         if (ro != &iproute) {
4098                                 memcpy(&iproute, ro, sizeof(*ro));
4099                         }
4100                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4101                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4102                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4103                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4104                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4105                             ro->ro_rt);
4106
4107                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4108                                 /* failed to prepend data, give up */
4109                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4110                                 sctp_m_freem(m);
4111                                 return (ENOMEM);
4112                         }
4113 #ifdef  SCTP_PACKET_LOGGING
4114                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4115                                 sctp_packet_log(m, packet_length);
4116 #endif
4117                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4118                         if (port) {
4119 #if defined(SCTP_WITH_NO_CSUM)
4120                                 SCTP_STAT_INCR(sctps_sendnocrc);
4121 #else
4122                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4123                                     (stcb) &&
4124                                     (stcb->asoc.loopback_scope))) {
4125                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4126                                         SCTP_STAT_INCR(sctps_sendswcrc);
4127                                 } else {
4128                                         SCTP_STAT_INCR(sctps_sendnocrc);
4129                                 }
4130 #endif
4131                                 if (V_udp_cksum) {
4132                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4133                                 }
4134                         } else {
4135 #if defined(SCTP_WITH_NO_CSUM)
4136                                 SCTP_STAT_INCR(sctps_sendnocrc);
4137 #else
4138                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4139                                 m->m_pkthdr.csum_data = 0;
4140                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4141 #endif
4142                         }
4143                         /* send it out.  table id is taken from stcb */
4144 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4145                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4146                                 so = SCTP_INP_SO(inp);
4147                                 SCTP_SOCKET_UNLOCK(so, 0);
4148                         }
4149 #endif
4150                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4151 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4152                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4153                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4154                                 SCTP_TCB_UNLOCK(stcb);
4155                                 SCTP_SOCKET_LOCK(so, 0);
4156                                 SCTP_TCB_LOCK(stcb);
4157                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4158                         }
4159 #endif
4160                         SCTP_STAT_INCR(sctps_sendpackets);
4161                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4162                         if (ret)
4163                                 SCTP_STAT_INCR(sctps_senderrors);
4164
4165                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4166                         if (net == NULL) {
4167                                 /* free tempy routes */
4168                                 if (ro->ro_rt) {
4169                                         RTFREE(ro->ro_rt);
4170                                         ro->ro_rt = NULL;
4171                                 }
4172                         } else {
4173                                 /*
4174                                  * PMTU check versus smallest asoc MTU goes
4175                                  * here
4176                                  */
4177                                 if ((ro->ro_rt != NULL) &&
4178                                     (net->ro._s_addr)) {
4179                                         uint32_t mtu;
4180
4181                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4182                                         if (net->port) {
4183                                                 mtu -= sizeof(struct udphdr);
4184                                         }
4185                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4186                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4187                                                 net->mtu = mtu;
4188                                         }
4189                                 } else if (ro->ro_rt == NULL) {
4190                                         /* route was freed */
4191                                         if (net->ro._s_addr &&
4192                                             net->src_addr_selected) {
4193                                                 sctp_free_ifa(net->ro._s_addr);
4194                                                 net->ro._s_addr = NULL;
4195                                         }
4196                                         net->src_addr_selected = 0;
4197                                 }
4198                         }
4199                         return (ret);
4200                 }
4201 #endif
4202 #ifdef INET6
4203         case AF_INET6:
4204                 {
4205                         uint32_t flowlabel, flowinfo;
4206                         struct ip6_hdr *ip6h;
4207                         struct route_in6 ip6route;
4208                         struct ifnet *ifp;
4209                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4210                         int prev_scope = 0;
4211                         struct sockaddr_in6 lsa6_storage;
4212                         int error;
4213                         u_short prev_port = 0;
4214                         int len;
4215
4216                         if (net) {
4217                                 flowlabel = net->flowlabel;
4218                         } else if (stcb) {
4219                                 flowlabel = stcb->asoc.default_flowlabel;
4220                         } else {
4221                                 flowlabel = inp->sctp_ep.default_flowlabel;
4222                         }
4223                         if (flowlabel == 0) {
4224                                 /*
4225                                  * This means especially, that it is not set
4226                                  * at the SCTP layer. So use the value from
4227                                  * the IP layer.
4228                                  */
4229                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4230                         }
4231                         flowlabel &= 0x000fffff;
4232                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4233                         if (port) {
4234                                 len += sizeof(struct udphdr);
4235                         }
4236                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4237                         if (newm == NULL) {
4238                                 sctp_m_freem(m);
4239                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4240                                 return (ENOMEM);
4241                         }
4242                         SCTP_ALIGN_TO_END(newm, len);
4243                         SCTP_BUF_LEN(newm) = len;
4244                         SCTP_BUF_NEXT(newm) = m;
4245                         m = newm;
4246                         if (net != NULL) {
4247 #ifdef INVARIANTS
4248                                 if (net->flowidset == 0) {
4249                                         panic("Flow ID not set");
4250                                 }
4251 #endif
4252                                 m->m_pkthdr.flowid = net->flowid;
4253                                 m->m_flags |= M_FLOWID;
4254                         } else {
4255                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
4256                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
4257                                         m->m_flags |= M_FLOWID;
4258                                 }
4259                         }
4260                         packet_length = sctp_calculate_len(m);
4261
4262                         ip6h = mtod(m, struct ip6_hdr *);
4263                         /* protect *sin6 from overwrite */
4264                         sin6 = (struct sockaddr_in6 *)to;
4265                         tmp = *sin6;
4266                         sin6 = &tmp;
4267
4268                         /* KAME hack: embed scopeid */
4269                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4270                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4271                                 return (EINVAL);
4272                         }
4273                         if (net == NULL) {
4274                                 memset(&ip6route, 0, sizeof(ip6route));
4275                                 ro = (sctp_route_t *) & ip6route;
4276                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4277                         } else {
4278                                 ro = (sctp_route_t *) & net->ro;
4279                         }
4280                         /*
4281                          * We assume here that inp_flow is in host byte
4282                          * order within the TCB!
4283                          */
4284                         if (tos_value == 0) {
4285                                 /*
4286                                  * This means especially, that it is not set
4287                                  * at the SCTP layer. So use the value from
4288                                  * the IP layer.
4289                                  */
4290                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4291                         }
4292                         tos_value &= 0xfc;
4293                         if (ecn_ok) {
4294                                 tos_value |= sctp_get_ect(stcb);
4295                         }
4296                         flowinfo = 0x06;
4297                         flowinfo <<= 8;
4298                         flowinfo |= tos_value;
4299                         flowinfo <<= 20;
4300                         flowinfo |= flowlabel;
4301                         ip6h->ip6_flow = htonl(flowinfo);
4302                         if (port) {
4303                                 ip6h->ip6_nxt = IPPROTO_UDP;
4304                         } else {
4305                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4306                         }
4307                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4308                         ip6h->ip6_dst = sin6->sin6_addr;
4309
4310                         /*
4311                          * Add SRC address selection here: we can only reuse
4312                          * to a limited degree the kame src-addr-sel, since
4313                          * we can try their selection but it may not be
4314                          * bound.
4315                          */
4316                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4317                         lsa6_tmp.sin6_family = AF_INET6;
4318                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4319                         lsa6 = &lsa6_tmp;
4320                         if (net && out_of_asoc_ok == 0) {
4321                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4322                                         sctp_free_ifa(net->ro._s_addr);
4323                                         net->ro._s_addr = NULL;
4324                                         net->src_addr_selected = 0;
4325                                         if (ro->ro_rt) {
4326                                                 RTFREE(ro->ro_rt);
4327                                                 ro->ro_rt = NULL;
4328                                         }
4329                                 }
4330                                 if (net->src_addr_selected == 0) {
4331                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4332                                         /* KAME hack: embed scopeid */
4333                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4334                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4335                                                 return (EINVAL);
4336                                         }
4337                                         /* Cache the source address */
4338                                         net->ro._s_addr = sctp_source_address_selection(inp,
4339                                             stcb,
4340                                             ro,
4341                                             net,
4342                                             0,
4343                                             vrf_id);
4344                                         (void)sa6_recoverscope(sin6);
4345                                         net->src_addr_selected = 1;
4346                                 }
4347                                 if (net->ro._s_addr == NULL) {
4348                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4349                                         net->src_addr_selected = 0;
4350                                         sctp_handle_no_route(stcb, net, so_locked);
4351                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4352                                         sctp_m_freem(m);
4353                                         return (EHOSTUNREACH);
4354                                 }
4355                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4356                         } else {
4357                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4358                                 /* KAME hack: embed scopeid */
4359                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4360                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4361                                         return (EINVAL);
4362                                 }
4363                                 if (over_addr == NULL) {
4364                                         struct sctp_ifa *_lsrc;
4365
4366                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4367                                             net,
4368                                             out_of_asoc_ok,
4369                                             vrf_id);
4370                                         if (_lsrc == NULL) {
4371                                                 sctp_handle_no_route(stcb, net, so_locked);
4372                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4373                                                 sctp_m_freem(m);
4374                                                 return (EHOSTUNREACH);
4375                                         }
4376                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4377                                         sctp_free_ifa(_lsrc);
4378                                 } else {
4379                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4380                                         SCTP_RTALLOC(ro, vrf_id);
4381                                 }
4382                                 (void)sa6_recoverscope(sin6);
4383                         }
4384                         lsa6->sin6_port = inp->sctp_lport;
4385
4386                         if (ro->ro_rt == NULL) {
4387                                 /*
4388                                  * src addr selection failed to find a route
4389                                  * (or valid source addr), so we can't get
4390                                  * there from here!
4391                                  */
4392                                 sctp_handle_no_route(stcb, net, so_locked);
4393                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4394                                 sctp_m_freem(m);
4395                                 return (EHOSTUNREACH);
4396                         }
4397                         /*
4398                          * XXX: sa6 may not have a valid sin6_scope_id in
4399                          * the non-SCOPEDROUTING case.
4400                          */
4401                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4402                         lsa6_storage.sin6_family = AF_INET6;
4403                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4404                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4405                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4406                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4407                                 sctp_m_freem(m);
4408                                 return (error);
4409                         }
4410                         /* XXX */
4411                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4412                         lsa6_storage.sin6_port = inp->sctp_lport;
4413                         lsa6 = &lsa6_storage;
4414                         ip6h->ip6_src = lsa6->sin6_addr;
4415
4416                         if (port) {
4417                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4418                                         sctp_handle_no_route(stcb, net, so_locked);
4419                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4420                                         sctp_m_freem(m);
4421                                         return (EHOSTUNREACH);
4422                                 }
4423                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4424                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4425                                 udp->uh_dport = port;
4426                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4427                                 udp->uh_sum = 0;
4428                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4429                         } else {
4430                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4431                         }
4432
4433                         sctphdr->src_port = src_port;
4434                         sctphdr->dest_port = dest_port;
4435                         sctphdr->v_tag = v_tag;
4436                         sctphdr->checksum = 0;
4437
4438                         /*
4439                          * We set the hop limit now since there is a good
4440                          * chance that our ro pointer is now filled
4441                          */
4442                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4443                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4444
4445 #ifdef SCTP_DEBUG
4446                         /* Copy to be sure something bad is not happening */
4447                         sin6->sin6_addr = ip6h->ip6_dst;
4448                         lsa6->sin6_addr = ip6h->ip6_src;
4449 #endif
4450
4451                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4452                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4453                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4454                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4455                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4456                         if (net) {
4457                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4458                                 /*
4459                                  * preserve the port and scope for link
4460                                  * local send
4461                                  */
4462                                 prev_scope = sin6->sin6_scope_id;
4463                                 prev_port = sin6->sin6_port;
4464                         }
4465                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4466                                 /* failed to prepend data, give up */
4467                                 sctp_m_freem(m);
4468                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4469                                 return (ENOMEM);
4470                         }
4471 #ifdef  SCTP_PACKET_LOGGING
4472                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4473                                 sctp_packet_log(m, packet_length);
4474 #endif
4475                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4476                         if (port) {
4477 #if defined(SCTP_WITH_NO_CSUM)
4478                                 SCTP_STAT_INCR(sctps_sendnocrc);
4479 #else
4480                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4481                                     (stcb) &&
4482                                     (stcb->asoc.loopback_scope))) {
4483                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4484                                         SCTP_STAT_INCR(sctps_sendswcrc);
4485                                 } else {
4486                                         SCTP_STAT_INCR(sctps_sendnocrc);
4487                                 }
4488 #endif
4489                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4490                                         udp->uh_sum = 0xffff;
4491                                 }
4492                         } else {
4493 #if defined(SCTP_WITH_NO_CSUM)
4494                                 SCTP_STAT_INCR(sctps_sendnocrc);
4495 #else
4496                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4497                                 m->m_pkthdr.csum_data = 0;
4498                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4499 #endif
4500                         }
4501                         /* send it out. table id is taken from stcb */
4502 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4503                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4504                                 so = SCTP_INP_SO(inp);
4505                                 SCTP_SOCKET_UNLOCK(so, 0);
4506                         }
4507 #endif
4508                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4509 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4510                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4511                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4512                                 SCTP_TCB_UNLOCK(stcb);
4513                                 SCTP_SOCKET_LOCK(so, 0);
4514                                 SCTP_TCB_LOCK(stcb);
4515                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4516                         }
4517 #endif
4518                         if (net) {
4519                                 /* for link local this must be done */
4520                                 sin6->sin6_scope_id = prev_scope;
4521                                 sin6->sin6_port = prev_port;
4522                         }
4523                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4524                         SCTP_STAT_INCR(sctps_sendpackets);
4525                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4526                         if (ret) {
4527                                 SCTP_STAT_INCR(sctps_senderrors);
4528                         }
4529                         if (net == NULL) {
4530                                 /* Now if we had a temp route free it */
4531                                 if (ro->ro_rt) {
4532                                         RTFREE(ro->ro_rt);
4533                                 }
4534                         } else {
4535                                 /*
4536                                  * PMTU check versus smallest asoc MTU goes
4537                                  * here
4538                                  */
4539                                 if (ro->ro_rt == NULL) {
4540                                         /* Route was freed */
4541                                         if (net->ro._s_addr &&
4542                                             net->src_addr_selected) {
4543                                                 sctp_free_ifa(net->ro._s_addr);
4544                                                 net->ro._s_addr = NULL;
4545                                         }
4546                                         net->src_addr_selected = 0;
4547                                 }
4548                                 if ((ro->ro_rt != NULL) &&
4549                                     (net->ro._s_addr)) {
4550                                         uint32_t mtu;
4551
4552                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4553                                         if (mtu &&
4554                                             (stcb->asoc.smallest_mtu > mtu)) {
4555                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4556                                                 net->mtu = mtu;
4557                                                 if (net->port) {
4558                                                         net->mtu -= sizeof(struct udphdr);
4559                                                 }
4560                                         }
4561                                 } else if (ifp) {
4562                                         if (ND_IFINFO(ifp)->linkmtu &&
4563                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4564                                                 sctp_mtu_size_reset(inp,
4565                                                     &stcb->asoc,
4566                                                     ND_IFINFO(ifp)->linkmtu);
4567                                         }
4568                                 }
4569                         }
4570                         return (ret);
4571                 }
4572 #endif
4573         default:
4574                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4575                     ((struct sockaddr *)to)->sa_family);
4576                 sctp_m_freem(m);
4577                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4578                 return (EFAULT);
4579         }
4580 }
4581
4582
4583 void
4584 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4585 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4586     SCTP_UNUSED
4587 #endif
4588 )
4589 {
4590         struct mbuf *m, *m_at, *mp_last;
4591         struct sctp_nets *net;
4592         struct sctp_init_chunk *init;
4593         struct sctp_supported_addr_param *sup_addr;
4594         struct sctp_adaptation_layer_indication *ali;
4595         struct sctp_ecn_supported_param *ecn;
4596         struct sctp_prsctp_supported_param *prsctp;
4597         struct sctp_supported_chunk_types_param *pr_supported;
4598         int cnt_inits_to = 0;
4599         int padval, ret;
4600         int num_ext;
4601         int p_len;
4602
4603         /* INIT's always go to the primary (and usually ONLY address) */
4604         mp_last = NULL;
4605         net = stcb->asoc.primary_destination;
4606         if (net == NULL) {
4607                 net = TAILQ_FIRST(&stcb->asoc.nets);
4608                 if (net == NULL) {
4609                         /* TSNH */
4610                         return;
4611                 }
4612                 /* we confirm any address we send an INIT to */
4613                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4614                 (void)sctp_set_primary_addr(stcb, NULL, net);
4615         } else {
4616                 /* we confirm any address we send an INIT to */
4617                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4618         }
4619         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4620 #ifdef INET6
4621         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4622                 /*
4623                  * special hook, if we are sending to link local it will not
4624                  * show up in our private address count.
4625                  */
4626                 struct sockaddr_in6 *sin6l;
4627
4628                 sin6l = &net->ro._l_addr.sin6;
4629                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4630                         cnt_inits_to = 1;
4631         }
4632 #endif
4633         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4634                 /* This case should not happen */
4635                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4636                 return;
4637         }
4638         /* start the INIT timer */
4639         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4640
4641         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4642         if (m == NULL) {
4643                 /* No memory, INIT timer will re-attempt. */
4644                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4645                 return;
4646         }
4647         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4648         /*
4649          * assume peer supports asconf in order to be able to queue local
4650          * address changes while an INIT is in flight and before the assoc
4651          * is established.
4652          */
4653         stcb->asoc.peer_supports_asconf = 1;
4654         /* Now lets put the SCTP header in place */
4655         init = mtod(m, struct sctp_init_chunk *);
4656         /* now the chunk header */
4657         init->ch.chunk_type = SCTP_INITIATION;
4658         init->ch.chunk_flags = 0;
4659         /* fill in later from mbuf we build */
4660         init->ch.chunk_length = 0;
4661         /* place in my tag */
4662         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4663         /* set up some of the credits. */
4664         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4665             SCTP_MINIMAL_RWND));
4666
4667         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4668         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4669         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4670         /* now the address restriction */
4671         /* XXX Should we take the address family of the socket into account? */
4672         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4673             sizeof(*init));
4674         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4675 #ifdef INET6
4676 #ifdef INET
4677         /* we support 2 types: IPv4/IPv6 */
4678         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4679         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4680         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4681 #else
4682         /* we support 1 type: IPv6 */
4683         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4684         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4685         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4686 #endif
4687 #else
4688         /* we support 1 type: IPv4 */
4689         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4690         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4691         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4692 #endif
4693         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4694         /* adaptation layer indication parameter */
4695         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4696         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4697         ali->ph.param_length = htons(sizeof(*ali));
4698         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4699         SCTP_BUF_LEN(m) += sizeof(*ali);
4700         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4701
4702         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4703                 /* Add NAT friendly parameter */
4704                 struct sctp_paramhdr *ph;
4705
4706                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4707                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4708                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4709                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4710                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4711         }
4712         /* now any cookie time extensions */
4713         if (stcb->asoc.cookie_preserve_req) {
4714                 struct sctp_cookie_perserve_param *cookie_preserve;
4715
4716                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4717                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4718                 cookie_preserve->ph.param_length = htons(
4719                     sizeof(*cookie_preserve));
4720                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4721                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4722                 ecn = (struct sctp_ecn_supported_param *)(
4723                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4724                 stcb->asoc.cookie_preserve_req = 0;
4725         }
4726         /* ECN parameter */
4727         if (stcb->asoc.ecn_allowed == 1) {
4728                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4729                 ecn->ph.param_length = htons(sizeof(*ecn));
4730                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4731                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4732                     sizeof(*ecn));
4733         } else {
4734                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4735         }
4736         /* And now tell the peer we do pr-sctp */
4737         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4738         prsctp->ph.param_length = htons(sizeof(*prsctp));
4739         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4740
4741         /* And now tell the peer we do all the extensions */
4742         pr_supported = (struct sctp_supported_chunk_types_param *)
4743             ((caddr_t)prsctp + sizeof(*prsctp));
4744         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4745         num_ext = 0;
4746         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4747         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4748         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4749         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4750         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4751         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4752                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4753         }
4754         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4755                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4756         }
4757         p_len = sizeof(*pr_supported) + num_ext;
4758         pr_supported->ph.param_length = htons(p_len);
4759         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4760         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4761
4762
4763         /* add authentication parameters */
4764         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4765                 struct sctp_auth_random *randp;
4766                 struct sctp_auth_hmac_algo *hmacs;
4767                 struct sctp_auth_chunk_list *chunks;
4768
4769                 /* attach RANDOM parameter, if available */
4770                 if (stcb->asoc.authinfo.random != NULL) {
4771                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4772                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4773                         /* random key already contains the header */
4774                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4775                         /* zero out any padding required */
4776                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4777                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4778                 }
4779                 /* add HMAC_ALGO parameter */
4780                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4781                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4782                     (uint8_t *) hmacs->hmac_ids);
4783                 if (p_len > 0) {
4784                         p_len += sizeof(*hmacs);
4785                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4786                         hmacs->ph.param_length = htons(p_len);
4787                         /* zero out any padding required */
4788                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4789                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4790                 }
4791                 /* add CHUNKS parameter */
4792                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4793                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4794                     chunks->chunk_types);
4795                 if (p_len > 0) {
4796                         p_len += sizeof(*chunks);
4797                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4798                         chunks->ph.param_length = htons(p_len);
4799                         /* zero out any padding required */
4800                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4801                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4802                 }
4803         }
4804         /* now the addresses */
4805         {
4806                 struct sctp_scoping scp;
4807
4808                 /*
4809                  * To optimize this we could put the scoping stuff into a
4810                  * structure and remove the individual uint8's from the
4811                  * assoc structure. Then we could just sifa in the address
4812                  * within the stcb. But for now this is a quick hack to get
4813                  * the address stuff teased apart.
4814                  */
4815
4816                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4817                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4818                 scp.loopback_scope = stcb->asoc.loopback_scope;
4819                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4820                 scp.local_scope = stcb->asoc.local_scope;
4821                 scp.site_scope = stcb->asoc.site_scope;
4822
4823                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4824         }
4825
4826         /* calulate the size and update pkt header and chunk header */
4827         p_len = 0;
4828         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4829                 if (SCTP_BUF_NEXT(m_at) == NULL)
4830                         mp_last = m_at;
4831                 p_len += SCTP_BUF_LEN(m_at);
4832         }
4833         init->ch.chunk_length = htons(p_len);
4834         /*
4835          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4836          * here since the timer will drive a retranmission.
4837          */
4838
4839         /* I don't expect this to execute but we will be safe here */
4840         padval = p_len % 4;
4841         if ((padval) && (mp_last)) {
4842                 /*
4843                  * The compiler worries that mp_last may not be set even
4844                  * though I think it is impossible :-> however we add
4845                  * mp_last here just in case.
4846                  */
4847                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4848                 if (ret) {
4849                         /* Houston we have a problem, no space */
4850                         sctp_m_freem(m);
4851                         return;
4852                 }
4853         }
4854         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4855         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4856             (struct sockaddr *)&net->ro._l_addr,
4857             m, 0, NULL, 0, 0, 0, 0,
4858             inp->sctp_lport, stcb->rport, htonl(0),
4859             net->port, so_locked, NULL, NULL);
4860         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4861         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4862         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4863 }
4864
4865 struct mbuf *
4866 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4867     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4868 {
4869         /*
4870          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4871          * being equal to the beginning of the params i.e. (iphlen +
4872          * sizeof(struct sctp_init_msg) parse through the parameters to the
4873          * end of the mbuf verifying that all parameters are known.
4874          *
4875          * For unknown parameters build and return a mbuf with
4876          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4877          * processing this chunk stop, and set *abort_processing to 1.
4878          *
4879          * By having param_offset be pre-set to where parameters begin it is
4880          * hoped that this routine may be reused in the future by new
4881          * features.
4882          */
4883         struct sctp_paramhdr *phdr, params;
4884
4885         struct mbuf *mat, *op_err;
4886         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4887         int at, limit, pad_needed;
4888         uint16_t ptype, plen, padded_size;
4889         int err_at;
4890
4891         *abort_processing = 0;
4892         mat = in_initpkt;
4893         err_at = 0;
4894         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4895         at = param_offset;
4896         op_err = NULL;
4897         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4898         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4899         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4900                 ptype = ntohs(phdr->param_type);
4901                 plen = ntohs(phdr->param_length);
4902                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4903                         /* wacked parameter */
4904                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4905                         goto invalid_size;
4906                 }
4907                 limit -= SCTP_SIZE32(plen);
4908                 /*-
4909                  * All parameters for all chunks that we know/understand are
4910                  * listed here. We process them other places and make
4911                  * appropriate stop actions per the upper bits. However this
4912                  * is the generic routine processor's can call to get back
4913                  * an operr.. to either incorporate (init-ack) or send.
4914                  */
4915                 padded_size = SCTP_SIZE32(plen);
4916                 switch (ptype) {
4917                         /* Param's with variable size */
4918                 case SCTP_HEARTBEAT_INFO:
4919                 case SCTP_STATE_COOKIE:
4920                 case SCTP_UNRECOG_PARAM:
4921                 case SCTP_ERROR_CAUSE_IND:
4922                         /* ok skip fwd */
4923                         at += padded_size;
4924                         break;
4925                         /* Param's with variable size within a range */
4926                 case SCTP_CHUNK_LIST:
4927                 case SCTP_SUPPORTED_CHUNK_EXT:
4928                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4929                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4930                                 goto invalid_size;
4931                         }
4932                         at += padded_size;
4933                         break;
4934                 case SCTP_SUPPORTED_ADDRTYPE:
4935                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4936                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4937                                 goto invalid_size;
4938                         }
4939                         at += padded_size;
4940                         break;
4941                 case SCTP_RANDOM:
4942                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4943                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4944                                 goto invalid_size;
4945                         }
4946                         at += padded_size;
4947                         break;
4948                 case SCTP_SET_PRIM_ADDR:
4949                 case SCTP_DEL_IP_ADDRESS:
4950                 case SCTP_ADD_IP_ADDRESS:
4951                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4952                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4953                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4954                                 goto invalid_size;
4955                         }
4956                         at += padded_size;
4957                         break;
4958                         /* Param's with a fixed size */
4959                 case SCTP_IPV4_ADDRESS:
4960                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4961                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4962                                 goto invalid_size;
4963                         }
4964                         at += padded_size;
4965                         break;
4966                 case SCTP_IPV6_ADDRESS:
4967                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4968                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4969                                 goto invalid_size;
4970                         }
4971                         at += padded_size;
4972                         break;
4973                 case SCTP_COOKIE_PRESERVE:
4974                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4975                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4976                                 goto invalid_size;
4977                         }
4978                         at += padded_size;
4979                         break;
4980                 case SCTP_HAS_NAT_SUPPORT:
4981                         *nat_friendly = 1;
4982                         /* fall through */
4983                 case SCTP_PRSCTP_SUPPORTED:
4984
4985                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4986                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4987                                 goto invalid_size;
4988                         }
4989                         at += padded_size;
4990                         break;
4991                 case SCTP_ECN_CAPABLE:
4992                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4993                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4994                                 goto invalid_size;
4995                         }
4996                         at += padded_size;
4997                         break;
4998                 case SCTP_ULP_ADAPTATION:
4999                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5000                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5001                                 goto invalid_size;
5002                         }
5003                         at += padded_size;
5004                         break;
5005                 case SCTP_SUCCESS_REPORT:
5006                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5007                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5008                                 goto invalid_size;
5009                         }
5010                         at += padded_size;
5011                         break;
5012                 case SCTP_HOSTNAME_ADDRESS:
5013                         {
5014                                 /* We can NOT handle HOST NAME addresses!! */
5015                                 int l_len;
5016
5017                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5018                                 *abort_processing = 1;
5019                                 if (op_err == NULL) {
5020                                         /* Ok need to try to get a mbuf */
5021 #ifdef INET6
5022                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5023 #else
5024                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5025 #endif
5026                                         l_len += plen;
5027                                         l_len += sizeof(struct sctp_paramhdr);
5028                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5029                                         if (op_err) {
5030                                                 SCTP_BUF_LEN(op_err) = 0;
5031                                                 /*
5032                                                  * pre-reserve space for ip
5033                                                  * and sctp header  and
5034                                                  * chunk hdr
5035                                                  */
5036 #ifdef INET6
5037                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5038 #else
5039                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5040 #endif
5041                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5042                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5043                                         }
5044                                 }
5045                                 if (op_err) {
5046                                         /* If we have space */
5047                                         struct sctp_paramhdr s;
5048
5049                                         if (err_at % 4) {
5050                                                 uint32_t cpthis = 0;
5051
5052                                                 pad_needed = 4 - (err_at % 4);
5053                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5054                                                 err_at += pad_needed;
5055                                         }
5056                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5057                                         s.param_length = htons(sizeof(s) + plen);
5058                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5059                                         err_at += sizeof(s);
5060                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5061                                         if (phdr == NULL) {
5062                                                 sctp_m_freem(op_err);
5063                                                 /*
5064                                                  * we are out of memory but
5065                                                  * we still need to have a
5066                                                  * look at what to do (the
5067                                                  * system is in trouble
5068                                                  * though).
5069                                                  */
5070                                                 return (NULL);
5071                                         }
5072                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5073                                 }
5074                                 return (op_err);
5075                                 break;
5076                         }
5077                 default:
5078                         /*
5079                          * we do not recognize the parameter figure out what
5080                          * we do.
5081                          */
5082                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5083                         if ((ptype & 0x4000) == 0x4000) {
5084                                 /* Report bit is set?? */
5085                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5086                                 if (op_err == NULL) {
5087                                         int l_len;
5088
5089                                         /* Ok need to try to get an mbuf */
5090 #ifdef INET6
5091                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5092 #else
5093                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5094 #endif
5095                                         l_len += plen;
5096                                         l_len += sizeof(struct sctp_paramhdr);
5097                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5098                                         if (op_err) {
5099                                                 SCTP_BUF_LEN(op_err) = 0;
5100 #ifdef INET6
5101                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5102 #else
5103                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5104 #endif
5105                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5106                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5107                                         }
5108                                 }
5109                                 if (op_err) {
5110                                         /* If we have space */
5111                                         struct sctp_paramhdr s;
5112
5113                                         if (err_at % 4) {
5114                                                 uint32_t cpthis = 0;
5115
5116                                                 pad_needed = 4 - (err_at % 4);
5117                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5118                                                 err_at += pad_needed;
5119                                         }
5120                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5121                                         s.param_length = htons(sizeof(s) + plen);
5122                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5123                                         err_at += sizeof(s);
5124                                         if (plen > sizeof(tempbuf)) {
5125                                                 plen = sizeof(tempbuf);
5126                                         }
5127                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5128                                         if (phdr == NULL) {
5129                                                 sctp_m_freem(op_err);
5130                                                 /*
5131                                                  * we are out of memory but
5132                                                  * we still need to have a
5133                                                  * look at what to do (the
5134                                                  * system is in trouble
5135                                                  * though).
5136                                                  */
5137                                                 op_err = NULL;
5138                                                 goto more_processing;
5139                                         }
5140                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5141                                         err_at += plen;
5142                                 }
5143                         }
5144         more_processing:
5145                         if ((ptype & 0x8000) == 0x0000) {
5146                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5147                                 return (op_err);
5148                         } else {
5149                                 /* skip this chunk and continue processing */
5150                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5151                                 at += SCTP_SIZE32(plen);
5152                         }
5153                         break;
5154
5155                 }
5156                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5157         }
5158         return (op_err);
5159 invalid_size:
5160         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5161         *abort_processing = 1;
5162         if ((op_err == NULL) && phdr) {
5163                 int l_len;
5164
5165 #ifdef INET6
5166                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5167 #else
5168                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5169 #endif
5170                 l_len += (2 * sizeof(struct sctp_paramhdr));
5171                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5172                 if (op_err) {
5173                         SCTP_BUF_LEN(op_err) = 0;
5174 #ifdef INET6
5175                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5176 #else
5177                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5178 #endif
5179                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5180                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5181                 }
5182         }
5183         if ((op_err) && phdr) {
5184                 struct sctp_paramhdr s;
5185
5186                 if (err_at % 4) {
5187                         uint32_t cpthis = 0;
5188
5189                         pad_needed = 4 - (err_at % 4);
5190                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5191                         err_at += pad_needed;
5192                 }
5193                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5194                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5195                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5196                 err_at += sizeof(s);
5197                 /* Only copy back the p-hdr that caused the issue */
5198                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5199         }
5200         return (op_err);
5201 }
5202
5203 static int
5204 sctp_are_there_new_addresses(struct sctp_association *asoc,
5205     struct mbuf *in_initpkt, int offset)
5206 {
5207         /*
5208          * Given a INIT packet, look through the packet to verify that there
5209          * are NO new addresses. As we go through the parameters add reports
5210          * of any un-understood parameters that require an error.  Also we
5211          * must return (1) to drop the packet if we see a un-understood
5212          * parameter that tells us to drop the chunk.
5213          */
5214         struct sockaddr *sa_touse;
5215         struct sockaddr *sa;
5216         struct sctp_paramhdr *phdr, params;
5217         uint16_t ptype, plen;
5218         uint8_t fnd;
5219         struct sctp_nets *net;
5220         struct ip *iph;
5221
5222 #ifdef INET
5223         struct sockaddr_in sin4, *sa4;
5224
5225 #endif
5226 #ifdef INET6
5227         struct sockaddr_in6 sin6, *sa6;
5228         struct ip6_hdr *ip6h;
5229
5230 #endif
5231
5232 #ifdef INET
5233         memset(&sin4, 0, sizeof(sin4));
5234         sin4.sin_family = AF_INET;
5235         sin4.sin_len = sizeof(sin4);
5236 #endif
5237 #ifdef INET6
5238         memset(&sin6, 0, sizeof(sin6));
5239         sin6.sin6_family = AF_INET6;
5240         sin6.sin6_len = sizeof(sin6);
5241 #endif
5242         sa_touse = NULL;
5243         /* First what about the src address of the pkt ? */
5244         iph = mtod(in_initpkt, struct ip *);
5245         switch (iph->ip_v) {
5246 #ifdef INET
5247         case IPVERSION:
5248                 /* source addr is IPv4 */
5249                 sin4.sin_addr = iph->ip_src;
5250                 sa_touse = (struct sockaddr *)&sin4;
5251                 break;
5252 #endif
5253 #ifdef INET6
5254         case IPV6_VERSION >> 4:
5255                 /* source addr is IPv6 */
5256                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5257                 sin6.sin6_addr = ip6h->ip6_src;
5258                 sa_touse = (struct sockaddr *)&sin6;
5259                 break;
5260 #endif
5261         default:
5262                 return (1);
5263         }
5264
5265         fnd = 0;
5266         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5267                 sa = (struct sockaddr *)&net->ro._l_addr;
5268                 if (sa->sa_family == sa_touse->sa_family) {
5269 #ifdef INET
5270                         if (sa->sa_family == AF_INET) {
5271                                 sa4 = (struct sockaddr_in *)sa;
5272                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5273                                         fnd = 1;
5274                                         break;
5275                                 }
5276                         }
5277 #endif
5278 #ifdef INET6
5279                         if (sa->sa_family == AF_INET6) {
5280                                 sa6 = (struct sockaddr_in6 *)sa;
5281                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5282                                         fnd = 1;
5283                                         break;
5284                                 }
5285                         }
5286 #endif
5287                 }
5288         }
5289         if (fnd == 0) {
5290                 /* New address added! no need to look futher. */
5291                 return (1);
5292         }
5293         /* Ok so far lets munge through the rest of the packet */
5294         offset += sizeof(struct sctp_init_chunk);
5295         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5296         while (phdr) {
5297                 sa_touse = NULL;
5298                 ptype = ntohs(phdr->param_type);
5299                 plen = ntohs(phdr->param_length);
5300                 switch (ptype) {
5301 #ifdef INET
5302                 case SCTP_IPV4_ADDRESS:
5303                         {
5304                                 struct sctp_ipv4addr_param *p4, p4_buf;
5305
5306                                 phdr = sctp_get_next_param(in_initpkt, offset,
5307                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5308                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5309                                     phdr == NULL) {
5310                                         return (1);
5311                                 }
5312                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5313                                 sin4.sin_addr.s_addr = p4->addr;
5314                                 sa_touse = (struct sockaddr *)&sin4;
5315                                 break;
5316                         }
5317 #endif
5318 #ifdef INET6
5319                 case SCTP_IPV6_ADDRESS:
5320                         {
5321                                 struct sctp_ipv6addr_param *p6, p6_buf;
5322
5323                                 phdr = sctp_get_next_param(in_initpkt, offset,
5324                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5325                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5326                                     phdr == NULL) {
5327                                         return (1);
5328                                 }
5329                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5330                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5331                                     sizeof(p6->addr));
5332                                 sa_touse = (struct sockaddr *)&sin6;
5333                                 break;
5334                         }
5335 #endif
5336                 default:
5337                         sa_touse = NULL;
5338                         break;
5339                 }
5340                 if (sa_touse) {
5341                         /* ok, sa_touse points to one to check */
5342                         fnd = 0;
5343                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5344                                 sa = (struct sockaddr *)&net->ro._l_addr;
5345                                 if (sa->sa_family != sa_touse->sa_family) {
5346                                         continue;
5347                                 }
5348 #ifdef INET
5349                                 if (sa->sa_family == AF_INET) {
5350                                         sa4 = (struct sockaddr_in *)sa;
5351                                         if (sa4->sin_addr.s_addr ==
5352                                             sin4.sin_addr.s_addr) {
5353                                                 fnd = 1;
5354                                                 break;
5355                                         }
5356                                 }
5357 #endif
5358 #ifdef INET6
5359                                 if (sa->sa_family == AF_INET6) {
5360                                         sa6 = (struct sockaddr_in6 *)sa;
5361                                         if (SCTP6_ARE_ADDR_EQUAL(
5362                                             sa6, &sin6)) {
5363                                                 fnd = 1;
5364                                                 break;
5365                                         }
5366                                 }
5367 #endif
5368                         }
5369                         if (!fnd) {
5370                                 /* New addr added! no need to look further */
5371                                 return (1);
5372                         }
5373                 }
5374                 offset += SCTP_SIZE32(plen);
5375                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5376         }
5377         return (0);
5378 }
5379
5380 /*
5381  * Given a MBUF chain that was sent into us containing an INIT. Build a
5382  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5383  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5384  * message (i.e. the struct sctp_init_msg).
5385  */
5386 void
5387 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5388     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
5389     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5390 {
5391         struct sctp_association *asoc;
5392         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5393         struct sctp_init_ack_chunk *initack;
5394         struct sctp_adaptation_layer_indication *ali;
5395         struct sctp_ecn_supported_param *ecn;
5396         struct sctp_prsctp_supported_param *prsctp;
5397         struct sctp_supported_chunk_types_param *pr_supported;
5398         union sctp_sockstore store, store1, *over_addr;
5399
5400 #ifdef INET
5401         struct sockaddr_in *sin, *to_sin;
5402
5403 #endif
5404 #ifdef INET6
5405         struct sockaddr_in6 *sin6, *to_sin6;
5406
5407 #endif
5408         struct ip *iph;
5409
5410 #ifdef INET6
5411         struct ip6_hdr *ip6;
5412
5413 #endif
5414         struct sockaddr *to;
5415         struct sctp_state_cookie stc;
5416         struct sctp_nets *net = NULL;
5417         uint8_t *signature = NULL;
5418         int cnt_inits_to = 0;
5419         uint16_t his_limit, i_want;
5420         int abort_flag, padval;
5421         int num_ext;
5422         int p_len;
5423         int nat_friendly = 0;
5424         struct socket *so;
5425
5426         if (stcb)
5427                 asoc = &stcb->asoc;
5428         else
5429                 asoc = NULL;
5430         mp_last = NULL;
5431         if ((asoc != NULL) &&
5432             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5433             (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5434                 /* new addresses, out of here in non-cookie-wait states */
5435                 /*
5436                  * Send a ABORT, we don't add the new address error clause
5437                  * though we even set the T bit and copy in the 0 tag.. this
5438                  * looks no different than if no listener was present.
5439                  */
5440                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5441                 return;
5442         }
5443         abort_flag = 0;
5444         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5445             (offset + sizeof(struct sctp_init_chunk)),
5446             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5447         if (abort_flag) {
5448 do_a_abort:
5449                 sctp_send_abort(init_pkt, iphlen, sh,
5450                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5451                 return;
5452         }
5453         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5454         if (m == NULL) {
5455                 /* No memory, INIT timer will re-attempt. */
5456                 if (op_err)
5457                         sctp_m_freem(op_err);
5458                 return;
5459         }
5460         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5461
5462         /* the time I built cookie */
5463         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5464
5465         /* populate any tie tags */
5466         if (asoc != NULL) {
5467                 /* unlock before tag selections */
5468                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5469                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5470                 stc.cookie_life = asoc->cookie_life;
5471                 net = asoc->primary_destination;
5472         } else {
5473                 stc.tie_tag_my_vtag = 0;
5474                 stc.tie_tag_peer_vtag = 0;
5475                 /* life I will award this cookie */
5476                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5477         }
5478
5479         /* copy in the ports for later check */
5480         stc.myport = sh->dest_port;
5481         stc.peerport = sh->src_port;
5482
5483         /*
5484          * If we wanted to honor cookie life extentions, we would add to
5485          * stc.cookie_life. For now we should NOT honor any extension
5486          */
5487         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5488         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5489                 struct inpcb *in_inp;
5490
5491                 /* Its a V6 socket */
5492                 in_inp = (struct inpcb *)inp;
5493                 stc.ipv6_addr_legal = 1;
5494                 /* Now look at the binding flag to see if V4 will be legal */
5495                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5496                         stc.ipv4_addr_legal = 1;
5497                 } else {
5498                         /* V4 addresses are NOT legal on the association */
5499                         stc.ipv4_addr_legal = 0;
5500                 }
5501         } else {
5502                 /* Its a V4 socket, no - V6 */
5503                 stc.ipv4_addr_legal = 1;
5504                 stc.ipv6_addr_legal = 0;
5505         }
5506
5507 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5508         stc.ipv4_scope = 1;
5509 #else
5510         stc.ipv4_scope = 0;
5511 #endif
5512         /* now for scope setup */
5513         memset((caddr_t)&store, 0, sizeof(store));
5514         memset((caddr_t)&store1, 0, sizeof(store1));
5515 #ifdef INET
5516         sin = &store.sin;
5517         to_sin = &store1.sin;
5518 #endif
5519 #ifdef INET6
5520         sin6 = &store.sin6;
5521         to_sin6 = &store1.sin6;
5522 #endif
5523         iph = mtod(init_pkt, struct ip *);
5524         /* establish the to_addr's */
5525         switch (iph->ip_v) {
5526 #ifdef INET
5527         case IPVERSION:
5528                 to_sin->sin_port = sh->dest_port;
5529                 to_sin->sin_family = AF_INET;
5530                 to_sin->sin_len = sizeof(struct sockaddr_in);
5531                 to_sin->sin_addr = iph->ip_dst;
5532                 break;
5533 #endif
5534 #ifdef INET6
5535         case IPV6_VERSION >> 4:
5536                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5537                 to_sin6->sin6_addr = ip6->ip6_dst;
5538                 to_sin6->sin6_scope_id = 0;
5539                 to_sin6->sin6_port = sh->dest_port;
5540                 to_sin6->sin6_family = AF_INET6;
5541                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5542                 break;
5543 #endif
5544         default:
5545                 goto do_a_abort;
5546                 break;
5547         }
5548
5549         if (net == NULL) {
5550                 to = (struct sockaddr *)&store;
5551                 switch (iph->ip_v) {
5552 #ifdef INET
5553                 case IPVERSION:
5554                         {
5555                                 sin->sin_family = AF_INET;
5556                                 sin->sin_len = sizeof(struct sockaddr_in);
5557                                 sin->sin_port = sh->src_port;
5558                                 sin->sin_addr = iph->ip_src;
5559                                 /* lookup address */
5560                                 stc.address[0] = sin->sin_addr.s_addr;
5561                                 stc.address[1] = 0;
5562                                 stc.address[2] = 0;
5563                                 stc.address[3] = 0;
5564                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5565                                 /* local from address */
5566                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5567                                 stc.laddress[1] = 0;
5568                                 stc.laddress[2] = 0;
5569                                 stc.laddress[3] = 0;
5570                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5571                                 /* scope_id is only for v6 */
5572                                 stc.scope_id = 0;
5573 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5574                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5575                                         stc.ipv4_scope = 1;
5576                                 }
5577 #else
5578                                 stc.ipv4_scope = 1;
5579 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5580                                 /* Must use the address in this case */
5581                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5582                                         stc.loopback_scope = 1;
5583                                         stc.ipv4_scope = 1;
5584                                         stc.site_scope = 1;
5585                                         stc.local_scope = 0;
5586                                 }
5587                                 break;
5588                         }
5589 #endif
5590 #ifdef INET6
5591                 case IPV6_VERSION >> 4:
5592                         {
5593                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5594                                 sin6->sin6_family = AF_INET6;
5595                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5596                                 sin6->sin6_port = sh->src_port;
5597                                 sin6->sin6_addr = ip6->ip6_src;
5598                                 /* lookup address */
5599                                 memcpy(&stc.address, &sin6->sin6_addr,
5600                                     sizeof(struct in6_addr));
5601                                 sin6->sin6_scope_id = 0;
5602                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5603                                 stc.scope_id = 0;
5604                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5605                                         /*
5606                                          * FIX ME: does this have scope from
5607                                          * rcvif?
5608                                          */
5609                                         (void)sa6_recoverscope(sin6);
5610                                         stc.scope_id = sin6->sin6_scope_id;
5611                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5612                                         stc.loopback_scope = 1;
5613                                         stc.local_scope = 0;
5614                                         stc.site_scope = 1;
5615                                         stc.ipv4_scope = 1;
5616                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5617                                         /*
5618                                          * If the new destination is a
5619                                          * LINK_LOCAL we must have common
5620                                          * both site and local scope. Don't
5621                                          * set local scope though since we
5622                                          * must depend on the source to be
5623                                          * added implicitly. We cannot
5624                                          * assure just because we share one
5625                                          * link that all links are common.
5626                                          */
5627                                         stc.local_scope = 0;
5628                                         stc.site_scope = 1;
5629                                         stc.ipv4_scope = 1;
5630                                         /*
5631                                          * we start counting for the private
5632                                          * address stuff at 1. since the
5633                                          * link local we source from won't
5634                                          * show up in our scoped count.
5635                                          */
5636                                         cnt_inits_to = 1;
5637                                         /*
5638                                          * pull out the scope_id from
5639                                          * incoming pkt
5640                                          */
5641                                         /*
5642                                          * FIX ME: does this have scope from
5643                                          * rcvif?
5644                                          */
5645                                         (void)sa6_recoverscope(sin6);
5646                                         stc.scope_id = sin6->sin6_scope_id;
5647                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5648                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5649                                         /*
5650                                          * If the new destination is
5651                                          * SITE_LOCAL then we must have site
5652                                          * scope in common.
5653                                          */
5654                                         stc.site_scope = 1;
5655                                 }
5656                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5657                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5658                                 break;
5659                         }
5660 #endif
5661                 default:
5662                         /* TSNH */
5663                         goto do_a_abort;
5664                         break;
5665                 }
5666         } else {
5667                 /* set the scope per the existing tcb */
5668
5669 #ifdef INET6
5670                 struct sctp_nets *lnet;
5671
5672 #endif
5673
5674                 stc.loopback_scope = asoc->loopback_scope;
5675                 stc.ipv4_scope = asoc->ipv4_local_scope;
5676                 stc.site_scope = asoc->site_scope;
5677                 stc.local_scope = asoc->local_scope;
5678 #ifdef INET6
5679                 /* Why do we not consider IPv4 LL addresses? */
5680                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5681                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5682                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5683                                         /*
5684                                          * if we have a LL address, start
5685                                          * counting at 1.
5686                                          */
5687                                         cnt_inits_to = 1;
5688                                 }
5689                         }
5690                 }
5691 #endif
5692                 /* use the net pointer */
5693                 to = (struct sockaddr *)&net->ro._l_addr;
5694                 switch (to->sa_family) {
5695 #ifdef INET
5696                 case AF_INET:
5697                         sin = (struct sockaddr_in *)to;
5698                         stc.address[0] = sin->sin_addr.s_addr;
5699                         stc.address[1] = 0;
5700                         stc.address[2] = 0;
5701                         stc.address[3] = 0;
5702                         stc.addr_type = SCTP_IPV4_ADDRESS;
5703                         if (net->src_addr_selected == 0) {
5704                                 /*
5705                                  * strange case here, the INIT should have
5706                                  * did the selection.
5707                                  */
5708                                 net->ro._s_addr = sctp_source_address_selection(inp,
5709                                     stcb, (sctp_route_t *) & net->ro,
5710                                     net, 0, vrf_id);
5711                                 if (net->ro._s_addr == NULL)
5712                                         return;
5713
5714                                 net->src_addr_selected = 1;
5715
5716                         }
5717                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5718                         stc.laddress[1] = 0;
5719                         stc.laddress[2] = 0;
5720                         stc.laddress[3] = 0;
5721                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5722                         /* scope_id is only for v6 */
5723                         stc.scope_id = 0;
5724                         break;
5725 #endif
5726 #ifdef INET6
5727                 case AF_INET6:
5728                         sin6 = (struct sockaddr_in6 *)to;
5729                         memcpy(&stc.address, &sin6->sin6_addr,
5730                             sizeof(struct in6_addr));
5731                         stc.addr_type = SCTP_IPV6_ADDRESS;
5732                         stc.scope_id = sin6->sin6_scope_id;
5733                         if (net->src_addr_selected == 0) {
5734                                 /*
5735                                  * strange case here, the INIT should have
5736                                  * did the selection.
5737                                  */
5738                                 net->ro._s_addr = sctp_source_address_selection(inp,
5739                                     stcb, (sctp_route_t *) & net->ro,
5740                                     net, 0, vrf_id);
5741                                 if (net->ro._s_addr == NULL)
5742                                         return;
5743
5744                                 net->src_addr_selected = 1;
5745                         }
5746                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5747                             sizeof(struct in6_addr));
5748                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5749                         break;
5750 #endif
5751                 }
5752         }
5753         /* Now lets put the SCTP header in place */
5754         initack = mtod(m, struct sctp_init_ack_chunk *);
5755         /* Save it off for quick ref */
5756         stc.peers_vtag = init_chk->init.initiate_tag;
5757         /* who are we */
5758         memcpy(stc.identification, SCTP_VERSION_STRING,
5759             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5760         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5761         /* now the chunk header */
5762         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5763         initack->ch.chunk_flags = 0;
5764         /* fill in later from mbuf we build */
5765         initack->ch.chunk_length = 0;
5766         /* place in my tag */
5767         if ((asoc != NULL) &&
5768             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5769             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5770             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5771                 /* re-use the v-tags and init-seq here */
5772                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5773                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5774         } else {
5775                 uint32_t vtag, itsn;
5776
5777                 if (hold_inp_lock) {
5778                         SCTP_INP_INCR_REF(inp);
5779                         SCTP_INP_RUNLOCK(inp);
5780                 }
5781                 if (asoc) {
5782                         atomic_add_int(&asoc->refcnt, 1);
5783                         SCTP_TCB_UNLOCK(stcb);
5784         new_tag:
5785                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5786                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5787                                 /*
5788                                  * Got a duplicate vtag on some guy behind a
5789                                  * nat make sure we don't use it.
5790                                  */
5791                                 goto new_tag;
5792                         }
5793                         initack->init.initiate_tag = htonl(vtag);
5794                         /* get a TSN to use too */
5795                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5796                         initack->init.initial_tsn = htonl(itsn);
5797                         SCTP_TCB_LOCK(stcb);
5798                         atomic_add_int(&asoc->refcnt, -1);
5799                 } else {
5800                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5801                         initack->init.initiate_tag = htonl(vtag);
5802                         /* get a TSN to use too */
5803                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5804                 }
5805                 if (hold_inp_lock) {
5806                         SCTP_INP_RLOCK(inp);
5807                         SCTP_INP_DECR_REF(inp);
5808                 }
5809         }
5810         /* save away my tag to */
5811         stc.my_vtag = initack->init.initiate_tag;
5812
5813         /* set up some of the credits. */
5814         so = inp->sctp_socket;
5815         if (so == NULL) {
5816                 /* memory problem */
5817                 sctp_m_freem(m);
5818                 return;
5819         } else {
5820                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5821         }
5822         /* set what I want */
5823         his_limit = ntohs(init_chk->init.num_inbound_streams);
5824         /* choose what I want */
5825         if (asoc != NULL) {
5826                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5827                         i_want = asoc->streamoutcnt;
5828                 } else {
5829                         i_want = inp->sctp_ep.pre_open_stream_count;
5830                 }
5831         } else {
5832                 i_want = inp->sctp_ep.pre_open_stream_count;
5833         }
5834         if (his_limit < i_want) {
5835                 /* I Want more :< */
5836                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5837         } else {
5838                 /* I can have what I want :> */
5839                 initack->init.num_outbound_streams = htons(i_want);
5840         }
5841         /* tell him his limt. */
5842         initack->init.num_inbound_streams =
5843             htons(inp->sctp_ep.max_open_streams_intome);
5844
5845         /* adaptation layer indication parameter */
5846         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5847         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5848         ali->ph.param_length = htons(sizeof(*ali));
5849         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5850         SCTP_BUF_LEN(m) += sizeof(*ali);
5851         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5852
5853         /* ECN parameter */
5854         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5855             (inp->sctp_ecn_enable == 1)) {
5856                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5857                 ecn->ph.param_length = htons(sizeof(*ecn));
5858                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5859
5860                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5861                     sizeof(*ecn));
5862         } else {
5863                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5864         }
5865         /* And now tell the peer we do  pr-sctp */
5866         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5867         prsctp->ph.param_length = htons(sizeof(*prsctp));
5868         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5869         if (nat_friendly) {
5870                 /* Add NAT friendly parameter */
5871                 struct sctp_paramhdr *ph;
5872
5873                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5874                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5875                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5876                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5877         }
5878         /* And now tell the peer we do all the extensions */
5879         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5880         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5881         num_ext = 0;
5882         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5883         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5884         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5885         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5886         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5887         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5888                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5889         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5890                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5891         p_len = sizeof(*pr_supported) + num_ext;
5892         pr_supported->ph.param_length = htons(p_len);
5893         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5894         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5895
5896         /* add authentication parameters */
5897         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5898                 struct sctp_auth_random *randp;
5899                 struct sctp_auth_hmac_algo *hmacs;
5900                 struct sctp_auth_chunk_list *chunks;
5901                 uint16_t random_len;
5902
5903                 /* generate and add RANDOM parameter */
5904                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5905                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5906                 randp->ph.param_type = htons(SCTP_RANDOM);
5907                 p_len = sizeof(*randp) + random_len;
5908                 randp->ph.param_length = htons(p_len);
5909                 SCTP_READ_RANDOM(randp->random_data, random_len);
5910                 /* zero out any padding required */
5911                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5912                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5913
5914                 /* add HMAC_ALGO parameter */
5915                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5916                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5917                     (uint8_t *) hmacs->hmac_ids);
5918                 if (p_len > 0) {
5919                         p_len += sizeof(*hmacs);
5920                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5921                         hmacs->ph.param_length = htons(p_len);
5922                         /* zero out any padding required */
5923                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5924                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5925                 }
5926                 /* add CHUNKS parameter */
5927                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5928                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5929                     chunks->chunk_types);
5930                 if (p_len > 0) {
5931                         p_len += sizeof(*chunks);
5932                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5933                         chunks->ph.param_length = htons(p_len);
5934                         /* zero out any padding required */
5935                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5936                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5937                 }
5938         }
5939         m_at = m;
5940         /* now the addresses */
5941         {
5942                 struct sctp_scoping scp;
5943
5944                 /*
5945                  * To optimize this we could put the scoping stuff into a
5946                  * structure and remove the individual uint8's from the stc
5947                  * structure. Then we could just sifa in the address within
5948                  * the stc.. but for now this is a quick hack to get the
5949                  * address stuff teased apart.
5950                  */
5951                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5952                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5953                 scp.loopback_scope = stc.loopback_scope;
5954                 scp.ipv4_local_scope = stc.ipv4_scope;
5955                 scp.local_scope = stc.local_scope;
5956                 scp.site_scope = stc.site_scope;
5957                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5958         }
5959
5960         /* tack on the operational error if present */
5961         if (op_err) {
5962                 struct mbuf *ol;
5963                 int llen;
5964
5965                 llen = 0;
5966                 ol = op_err;
5967
5968                 while (ol) {
5969                         llen += SCTP_BUF_LEN(ol);
5970                         ol = SCTP_BUF_NEXT(ol);
5971                 }
5972                 if (llen % 4) {
5973                         /* must add a pad to the param */
5974                         uint32_t cpthis = 0;
5975                         int padlen;
5976
5977                         padlen = 4 - (llen % 4);
5978                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5979                 }
5980                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5981                         m_at = SCTP_BUF_NEXT(m_at);
5982                 }
5983                 SCTP_BUF_NEXT(m_at) = op_err;
5984                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5985                         m_at = SCTP_BUF_NEXT(m_at);
5986                 }
5987         }
5988         /* pre-calulate the size and update pkt header and chunk header */
5989         p_len = 0;
5990         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5991                 p_len += SCTP_BUF_LEN(m_tmp);
5992                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5993                         /* m_tmp should now point to last one */
5994                         break;
5995                 }
5996         }
5997
5998         /* Now we must build a cookie */
5999         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6000         if (m_cookie == NULL) {
6001                 /* memory problem */
6002                 sctp_m_freem(m);
6003                 return;
6004         }
6005         /* Now append the cookie to the end and update the space/size */
6006         SCTP_BUF_NEXT(m_tmp) = m_cookie;
6007
6008         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6009                 p_len += SCTP_BUF_LEN(m_tmp);
6010                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6011                         /* m_tmp should now point to last one */
6012                         mp_last = m_tmp;
6013                         break;
6014                 }
6015         }
6016         /*
6017          * Place in the size, but we don't include the last pad (if any) in
6018          * the INIT-ACK.
6019          */
6020         initack->ch.chunk_length = htons(p_len);
6021
6022         /*
6023          * Time to sign the cookie, we don't sign over the cookie signature
6024          * though thus we set trailer.
6025          */
6026         (void)sctp_hmac_m(SCTP_HMAC,
6027             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6028             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6029             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6030         /*
6031          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6032          * here since the timer will drive a retranmission.
6033          */
6034         padval = p_len % 4;
6035         if ((padval) && (mp_last)) {
6036                 /* see my previous comments on mp_last */
6037                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6038                         /* Houston we have a problem, no space */
6039                         sctp_m_freem(m);
6040                         return;
6041                 }
6042         }
6043         if (stc.loopback_scope) {
6044                 over_addr = &store1;
6045         } else {
6046                 over_addr = NULL;
6047         }
6048
6049         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6050             0, 0,
6051             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6052             port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
6053         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6054 }
6055
6056
6057 static void
6058 sctp_prune_prsctp(struct sctp_tcb *stcb,
6059     struct sctp_association *asoc,
6060     struct sctp_sndrcvinfo *srcv,
6061     int dataout)
6062 {
6063         int freed_spc = 0;
6064         struct sctp_tmit_chunk *chk, *nchk;
6065
6066         SCTP_TCB_LOCK_ASSERT(stcb);
6067         if ((asoc->peer_supports_prsctp) &&
6068             (asoc->sent_queue_cnt_removeable > 0)) {
6069                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6070                         /*
6071                          * Look for chunks marked with the PR_SCTP flag AND
6072                          * the buffer space flag. If the one being sent is
6073                          * equal or greater priority then purge the old one
6074                          * and free some space.
6075                          */
6076                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6077                                 /*
6078                                  * This one is PR-SCTP AND buffer space
6079                                  * limited type
6080                                  */
6081                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6082                                         /*
6083                                          * Lower numbers equates to higher
6084                                          * priority so if the one we are
6085                                          * looking at has a larger or equal
6086                                          * priority we want to drop the data
6087                                          * and NOT retransmit it.
6088                                          */
6089                                         if (chk->data) {
6090                                                 /*
6091                                                  * We release the book_size
6092                                                  * if the mbuf is here
6093                                                  */
6094                                                 int ret_spc;
6095                                                 int cause;
6096
6097                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6098                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
6099                                                 else
6100                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
6101                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6102                                                     cause,
6103                                                     SCTP_SO_LOCKED);
6104                                                 freed_spc += ret_spc;
6105                                                 if (freed_spc >= dataout) {
6106                                                         return;
6107                                                 }
6108                                         }       /* if chunk was present */
6109                                 }       /* if of sufficent priority */
6110                         }       /* if chunk has enabled */
6111                 }               /* tailqforeach */
6112
6113                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6114                         /* Here we must move to the sent queue and mark */
6115                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6116                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6117                                         if (chk->data) {
6118                                                 /*
6119                                                  * We release the book_size
6120                                                  * if the mbuf is here
6121                                                  */
6122                                                 int ret_spc;
6123
6124                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6125                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
6126                                                     SCTP_SO_LOCKED);
6127
6128                                                 freed_spc += ret_spc;
6129                                                 if (freed_spc >= dataout) {
6130                                                         return;
6131                                                 }
6132                                         }       /* end if chk->data */
6133                                 }       /* end if right class */
6134                         }       /* end if chk pr-sctp */
6135                 }               /* tailqforeachsafe (chk) */
6136         }                       /* if enabled in asoc */
6137 }
6138
6139 int
6140 sctp_get_frag_point(struct sctp_tcb *stcb,
6141     struct sctp_association *asoc)
6142 {
6143         int siz, ovh;
6144
6145         /*
6146          * For endpoints that have both v6 and v4 addresses we must reserve
6147          * room for the ipv6 header, for those that are only dealing with V4
6148          * we use a larger frag point.
6149          */
6150         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6151                 ovh = SCTP_MED_OVERHEAD;
6152         } else {
6153                 ovh = SCTP_MED_V4_OVERHEAD;
6154         }
6155
6156         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6157                 siz = asoc->smallest_mtu - ovh;
6158         else
6159                 siz = (stcb->asoc.sctp_frag_point - ovh);
6160         /*
6161          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6162          */
6163         /* A data chunk MUST fit in a cluster */
6164         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6165         /* } */
6166
6167         /* adjust for an AUTH chunk if DATA requires auth */
6168         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6169                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6170
6171         if (siz % 4) {
6172                 /* make it an even word boundary please */
6173                 siz -= (siz % 4);
6174         }
6175         return (siz);
6176 }
6177
6178 static void
6179 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6180 {
6181         sp->pr_sctp_on = 0;
6182         /*
6183          * We assume that the user wants PR_SCTP_TTL if the user provides a
6184          * positive lifetime but does not specify any PR_SCTP policy. This
6185          * is a BAD assumption and causes problems at least with the
6186          * U-Vancovers MPI folks. I will change this to be no policy means
6187          * NO PR-SCTP.
6188          */
6189         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6190                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6191                 sp->pr_sctp_on = 1;
6192         } else {
6193                 return;
6194         }
6195         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6196         case CHUNK_FLAGS_PR_SCTP_BUF:
6197                 /*
6198                  * Time to live is a priority stored in tv_sec when doing
6199                  * the buffer drop thing.
6200                  */
6201                 sp->ts.tv_sec = sp->timetolive;
6202                 sp->ts.tv_usec = 0;
6203                 break;
6204         case CHUNK_FLAGS_PR_SCTP_TTL:
6205                 {
6206                         struct timeval tv;
6207
6208                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6209                         tv.tv_sec = sp->timetolive / 1000;
6210                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6211                         /*
6212                          * TODO sctp_constants.h needs alternative time
6213                          * macros when _KERNEL is undefined.
6214                          */
6215                         timevaladd(&sp->ts, &tv);
6216                 }
6217                 break;
6218         case CHUNK_FLAGS_PR_SCTP_RTX:
6219                 /*
6220                  * Time to live is a the number or retransmissions stored in
6221                  * tv_sec.
6222                  */
6223                 sp->ts.tv_sec = sp->timetolive;
6224                 sp->ts.tv_usec = 0;
6225                 break;
6226         default:
6227                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6228                     "Unknown PR_SCTP policy %u.\n",
6229                     PR_SCTP_POLICY(sp->sinfo_flags));
6230                 break;
6231         }
6232 }
6233
6234 static int
6235 sctp_msg_append(struct sctp_tcb *stcb,
6236     struct sctp_nets *net,
6237     struct mbuf *m,
6238     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6239 {
6240         int error = 0;
6241         struct mbuf *at;
6242         struct sctp_stream_queue_pending *sp = NULL;
6243         struct sctp_stream_out *strm;
6244
6245         /*
6246          * Given an mbuf chain, put it into the association send queue and
6247          * place it on the wheel
6248          */
6249         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6250                 /* Invalid stream number */
6251                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6252                 error = EINVAL;
6253                 goto out_now;
6254         }
6255         if ((stcb->asoc.stream_locked) &&
6256             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6257                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6258                 error = EINVAL;
6259                 goto out_now;
6260         }
6261         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6262         /* Now can we send this? */
6263         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6264             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6265             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6266             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6267                 /* got data while shutting down */
6268                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6269                 error = ECONNRESET;
6270                 goto out_now;
6271         }
6272         sctp_alloc_a_strmoq(stcb, sp);
6273         if (sp == NULL) {
6274                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6275                 error = ENOMEM;
6276                 goto out_now;
6277         }
6278         sp->sinfo_flags = srcv->sinfo_flags;
6279         sp->timetolive = srcv->sinfo_timetolive;
6280         sp->ppid = srcv->sinfo_ppid;
6281         sp->context = srcv->sinfo_context;
6282         sp->strseq = 0;
6283         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6284                 sp->net = net;
6285                 atomic_add_int(&sp->net->ref_count, 1);
6286         } else {
6287                 sp->net = NULL;
6288         }
6289         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6290         sp->stream = srcv->sinfo_stream;
6291         sp->msg_is_complete = 1;
6292         sp->sender_all_done = 1;
6293         sp->some_taken = 0;
6294         sp->data = m;
6295         sp->tail_mbuf = NULL;
6296         sctp_set_prsctp_policy(sp);
6297         /*
6298          * We could in theory (for sendall) sifa the length in, but we would
6299          * still have to hunt through the chain since we need to setup the
6300          * tail_mbuf
6301          */
6302         sp->length = 0;
6303         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6304                 if (SCTP_BUF_NEXT(at) == NULL)
6305                         sp->tail_mbuf = at;
6306                 sp->length += SCTP_BUF_LEN(at);
6307         }
6308         if (srcv->sinfo_keynumber_valid) {
6309                 sp->auth_keyid = srcv->sinfo_keynumber;
6310         } else {
6311                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6312         }
6313         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6314                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6315                 sp->holds_key_ref = 1;
6316         }
6317         if (hold_stcb_lock == 0) {
6318                 SCTP_TCB_SEND_LOCK(stcb);
6319         }
6320         sctp_snd_sb_alloc(stcb, sp->length);
6321         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6322         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6323         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6324                 sp->strseq = strm->next_sequence_sent;
6325                 strm->next_sequence_sent++;
6326         }
6327         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6328         m = NULL;
6329         if (hold_stcb_lock == 0) {
6330                 SCTP_TCB_SEND_UNLOCK(stcb);
6331         }
6332 out_now:
6333         if (m) {
6334                 sctp_m_freem(m);
6335         }
6336         return (error);
6337 }
6338
6339
6340 static struct mbuf *
6341 sctp_copy_mbufchain(struct mbuf *clonechain,
6342     struct mbuf *outchain,
6343     struct mbuf **endofchain,
6344     int can_take_mbuf,
6345     int sizeofcpy,
6346     uint8_t copy_by_ref)
6347 {
6348         struct mbuf *m;
6349         struct mbuf *appendchain;
6350         caddr_t cp;
6351         int len;
6352
6353         if (endofchain == NULL) {
6354                 /* error */
6355 error_out:
6356                 if (outchain)
6357                         sctp_m_freem(outchain);
6358                 return (NULL);
6359         }
6360         if (can_take_mbuf) {
6361                 appendchain = clonechain;
6362         } else {
6363                 if (!copy_by_ref &&
6364                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6365                     ) {
6366                         /* Its not in a cluster */
6367                         if (*endofchain == NULL) {
6368                                 /* lets get a mbuf cluster */
6369                                 if (outchain == NULL) {
6370                                         /* This is the general case */
6371                         new_mbuf:
6372                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6373                                         if (outchain == NULL) {
6374                                                 goto error_out;
6375                                         }
6376                                         SCTP_BUF_LEN(outchain) = 0;
6377                                         *endofchain = outchain;
6378                                         /* get the prepend space */
6379                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6380                                 } else {
6381                                         /*
6382                                          * We really should not get a NULL
6383                                          * in endofchain
6384                                          */
6385                                         /* find end */
6386                                         m = outchain;
6387                                         while (m) {
6388                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6389                                                         *endofchain = m;
6390                                                         break;
6391                                                 }
6392                                                 m = SCTP_BUF_NEXT(m);
6393                                         }
6394                                         /* sanity */
6395                                         if (*endofchain == NULL) {
6396                                                 /*
6397                                                  * huh, TSNH XXX maybe we
6398                                                  * should panic
6399                                                  */
6400                                                 sctp_m_freem(outchain);
6401                                                 goto new_mbuf;
6402                                         }
6403                                 }
6404                                 /* get the new end of length */
6405                                 len = M_TRAILINGSPACE(*endofchain);
6406                         } else {
6407                                 /* how much is left at the end? */
6408                                 len = M_TRAILINGSPACE(*endofchain);
6409                         }
6410                         /* Find the end of the data, for appending */
6411                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6412
6413                         /* Now lets copy it out */
6414                         if (len >= sizeofcpy) {
6415                                 /* It all fits, copy it in */
6416                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6417                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6418                         } else {
6419                                 /* fill up the end of the chain */
6420                                 if (len > 0) {
6421                                         m_copydata(clonechain, 0, len, cp);
6422                                         SCTP_BUF_LEN((*endofchain)) += len;
6423                                         /* now we need another one */
6424                                         sizeofcpy -= len;
6425                                 }
6426                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6427                                 if (m == NULL) {
6428                                         /* We failed */
6429                                         goto error_out;
6430                                 }
6431                                 SCTP_BUF_NEXT((*endofchain)) = m;
6432                                 *endofchain = m;
6433                                 cp = mtod((*endofchain), caddr_t);
6434                                 m_copydata(clonechain, len, sizeofcpy, cp);
6435                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6436                         }
6437                         return (outchain);
6438                 } else {
6439                         /* copy the old fashion way */
6440                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6441 #ifdef SCTP_MBUF_LOGGING
6442                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6443                                 struct mbuf *mat;
6444
6445                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6446                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6447                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6448                                         }
6449                                 }
6450                         }
6451 #endif
6452                 }
6453         }
6454         if (appendchain == NULL) {
6455                 /* error */
6456                 if (outchain)
6457                         sctp_m_freem(outchain);
6458                 return (NULL);
6459         }
6460         if (outchain) {
6461                 /* tack on to the end */
6462                 if (*endofchain != NULL) {
6463                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6464                 } else {
6465                         m = outchain;
6466                         while (m) {
6467                                 if (SCTP_BUF_NEXT(m) == NULL) {
6468                                         SCTP_BUF_NEXT(m) = appendchain;
6469                                         break;
6470                                 }
6471                                 m = SCTP_BUF_NEXT(m);
6472                         }
6473                 }
6474                 /*
6475                  * save off the end and update the end-chain postion
6476                  */
6477                 m = appendchain;
6478                 while (m) {
6479                         if (SCTP_BUF_NEXT(m) == NULL) {
6480                                 *endofchain = m;
6481                                 break;
6482                         }
6483                         m = SCTP_BUF_NEXT(m);
6484                 }
6485                 return (outchain);
6486         } else {
6487                 /* save off the end and update the end-chain postion */
6488                 m = appendchain;
6489                 while (m) {
6490                         if (SCTP_BUF_NEXT(m) == NULL) {
6491                                 *endofchain = m;
6492                                 break;
6493                         }
6494                         m = SCTP_BUF_NEXT(m);
6495                 }
6496                 return (appendchain);
6497         }
6498 }
6499
6500 int
6501 sctp_med_chunk_output(struct sctp_inpcb *inp,
6502     struct sctp_tcb *stcb,
6503     struct sctp_association *asoc,
6504     int *num_out,
6505     int *reason_code,
6506     int control_only, int from_where,
6507     struct timeval *now, int *now_filled, int frag_point, int so_locked
6508 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6509     SCTP_UNUSED
6510 #endif
6511 );
6512
6513 static void
6514 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6515     uint32_t val SCTP_UNUSED)
6516 {
6517         struct sctp_copy_all *ca;
6518         struct mbuf *m;
6519         int ret = 0;
6520         int added_control = 0;
6521         int un_sent, do_chunk_output = 1;
6522         struct sctp_association *asoc;
6523         struct sctp_nets *net;
6524
6525         ca = (struct sctp_copy_all *)ptr;
6526         if (ca->m == NULL) {
6527                 return;
6528         }
6529         if (ca->inp != inp) {
6530                 /* TSNH */
6531                 return;
6532         }
6533         if ((ca->m) && ca->sndlen) {
6534                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6535                 if (m == NULL) {
6536                         /* can't copy so we are done */
6537                         ca->cnt_failed++;
6538                         return;
6539                 }
6540 #ifdef SCTP_MBUF_LOGGING
6541                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6542                         struct mbuf *mat;
6543
6544                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6545                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6546                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6547                                 }
6548                         }
6549                 }
6550 #endif
6551         } else {
6552                 m = NULL;
6553         }
6554         SCTP_TCB_LOCK_ASSERT(stcb);
6555         if (stcb->asoc.alternate) {
6556                 net = stcb->asoc.alternate;
6557         } else {
6558                 net = stcb->asoc.primary_destination;
6559         }
6560         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6561                 /* Abort this assoc with m as the user defined reason */
6562                 if (m) {
6563                         struct sctp_paramhdr *ph;
6564
6565                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6566                         if (m) {
6567                                 ph = mtod(m, struct sctp_paramhdr *);
6568                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6569                                 ph->param_length = htons(ca->sndlen);
6570                         }
6571                         /*
6572                          * We add one here to keep the assoc from
6573                          * dis-appearing on us.
6574                          */
6575                         atomic_add_int(&stcb->asoc.refcnt, 1);
6576                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6577                         /*
6578                          * sctp_abort_an_association calls sctp_free_asoc()
6579                          * free association will NOT free it since we
6580                          * incremented the refcnt .. we do this to prevent
6581                          * it being freed and things getting tricky since we
6582                          * could end up (from free_asoc) calling inpcb_free
6583                          * which would get a recursive lock call to the
6584                          * iterator lock.. But as a consequence of that the
6585                          * stcb will return to us un-locked.. since
6586                          * free_asoc returns with either no TCB or the TCB
6587                          * unlocked, we must relock.. to unlock in the
6588                          * iterator timer :-0
6589                          */
6590                         SCTP_TCB_LOCK(stcb);
6591                         atomic_add_int(&stcb->asoc.refcnt, -1);
6592                         goto no_chunk_output;
6593                 }
6594         } else {
6595                 if (m) {
6596                         ret = sctp_msg_append(stcb, net, m,
6597                             &ca->sndrcv, 1);
6598                 }
6599                 asoc = &stcb->asoc;
6600                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6601                         /* shutdown this assoc */
6602                         int cnt;
6603
6604                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6605
6606                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6607                             TAILQ_EMPTY(&asoc->sent_queue) &&
6608                             (cnt == 0)) {
6609                                 if (asoc->locked_on_sending) {
6610                                         goto abort_anyway;
6611                                 }
6612                                 /*
6613                                  * there is nothing queued to send, so I'm
6614                                  * done...
6615                                  */
6616                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6617                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6618                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6619                                         /*
6620                                          * only send SHUTDOWN the first time
6621                                          * through
6622                                          */
6623                                         sctp_send_shutdown(stcb, net);
6624                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6625                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6626                                         }
6627                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6628                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6629                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6630                                             net);
6631                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6632                                             asoc->primary_destination);
6633                                         added_control = 1;
6634                                         do_chunk_output = 0;
6635                                 }
6636                         } else {
6637                                 /*
6638                                  * we still got (or just got) data to send,
6639                                  * so set SHUTDOWN_PENDING
6640                                  */
6641                                 /*
6642                                  * XXX sockets draft says that SCTP_EOF
6643                                  * should be sent with no data.  currently,
6644                                  * we will allow user data to be sent first
6645                                  * and move to SHUTDOWN-PENDING
6646                                  */
6647                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6648                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6649                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6650                                         if (asoc->locked_on_sending) {
6651                                                 /*
6652                                                  * Locked to send out the
6653                                                  * data
6654                                                  */
6655                                                 struct sctp_stream_queue_pending *sp;
6656
6657                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6658                                                 if (sp) {
6659                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6660                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6661                                                 }
6662                                         }
6663                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6664                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6665                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6666                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6667                                 abort_anyway:
6668                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6669                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6670                                                     NULL, SCTP_SO_NOT_LOCKED);
6671                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6672                                                 goto no_chunk_output;
6673                                         }
6674                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6675                                             asoc->primary_destination);
6676                                 }
6677                         }
6678
6679                 }
6680         }
6681         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6682             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6683
6684         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6685             (stcb->asoc.total_flight > 0) &&
6686             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6687             ) {
6688                 do_chunk_output = 0;
6689         }
6690         if (do_chunk_output)
6691                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6692         else if (added_control) {
6693                 int num_out = 0, reason = 0, now_filled = 0;
6694                 struct timeval now;
6695                 int frag_point;
6696
6697                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6698                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6699                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6700         }
6701 no_chunk_output:
6702         if (ret) {
6703                 ca->cnt_failed++;
6704         } else {
6705                 ca->cnt_sent++;
6706         }
6707 }
6708
6709 static void
6710 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6711 {
6712         struct sctp_copy_all *ca;
6713
6714         ca = (struct sctp_copy_all *)ptr;
6715         /*
6716          * Do a notify here? Kacheong suggests that the notify be done at
6717          * the send time.. so you would push up a notification if any send
6718          * failed. Don't know if this is feasable since the only failures we
6719          * have is "memory" related and if you cannot get an mbuf to send
6720          * the data you surely can't get an mbuf to send up to notify the
6721          * user you can't send the data :->
6722          */
6723
6724         /* now free everything */
6725         sctp_m_freem(ca->m);
6726         SCTP_FREE(ca, SCTP_M_COPYAL);
6727 }
6728
6729
6730 #define MC_ALIGN(m, len) do {                                           \
6731         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6732 } while (0)
6733
6734
6735
6736 static struct mbuf *
6737 sctp_copy_out_all(struct uio *uio, int len)
6738 {
6739         struct mbuf *ret, *at;
6740         int left, willcpy, cancpy, error;
6741
6742         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6743         if (ret == NULL) {
6744                 /* TSNH */
6745                 return (NULL);
6746         }
6747         left = len;
6748         SCTP_BUF_LEN(ret) = 0;
6749         /* save space for the data chunk header */
6750         cancpy = M_TRAILINGSPACE(ret);
6751         willcpy = min(cancpy, left);
6752         at = ret;
6753         while (left > 0) {
6754                 /* Align data to the end */
6755                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6756                 if (error) {
6757         err_out_now:
6758                         sctp_m_freem(at);
6759                         return (NULL);
6760                 }
6761                 SCTP_BUF_LEN(at) = willcpy;
6762                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6763                 left -= willcpy;
6764                 if (left > 0) {
6765                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6766                         if (SCTP_BUF_NEXT(at) == NULL) {
6767                                 goto err_out_now;
6768                         }
6769                         at = SCTP_BUF_NEXT(at);
6770                         SCTP_BUF_LEN(at) = 0;
6771                         cancpy = M_TRAILINGSPACE(at);
6772                         willcpy = min(cancpy, left);
6773                 }
6774         }
6775         return (ret);
6776 }
6777
6778 static int
6779 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6780     struct sctp_sndrcvinfo *srcv)
6781 {
6782         int ret;
6783         struct sctp_copy_all *ca;
6784
6785         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6786             SCTP_M_COPYAL);
6787         if (ca == NULL) {
6788                 sctp_m_freem(m);
6789                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6790                 return (ENOMEM);
6791         }
6792         memset(ca, 0, sizeof(struct sctp_copy_all));
6793
6794         ca->inp = inp;
6795         if (srcv) {
6796                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6797         }
6798         /*
6799          * take off the sendall flag, it would be bad if we failed to do
6800          * this :-0
6801          */
6802         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6803         /* get length and mbuf chain */
6804         if (uio) {
6805                 ca->sndlen = uio->uio_resid;
6806                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6807                 if (ca->m == NULL) {
6808                         SCTP_FREE(ca, SCTP_M_COPYAL);
6809                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6810                         return (ENOMEM);
6811                 }
6812         } else {
6813                 /* Gather the length of the send */
6814                 struct mbuf *mat;
6815
6816                 mat = m;
6817                 ca->sndlen = 0;
6818                 while (m) {
6819                         ca->sndlen += SCTP_BUF_LEN(m);
6820                         m = SCTP_BUF_NEXT(m);
6821                 }
6822                 ca->m = mat;
6823         }
6824         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6825             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6826             SCTP_ASOC_ANY_STATE,
6827             (void *)ca, 0,
6828             sctp_sendall_completes, inp, 1);
6829         if (ret) {
6830                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6831                 SCTP_FREE(ca, SCTP_M_COPYAL);
6832                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6833                 return (EFAULT);
6834         }
6835         return (0);
6836 }
6837
6838
6839 void
6840 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6841 {
6842         struct sctp_tmit_chunk *chk, *nchk;
6843
6844         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6845                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6846                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6847                         if (chk->data) {
6848                                 sctp_m_freem(chk->data);
6849                                 chk->data = NULL;
6850                         }
6851                         asoc->ctrl_queue_cnt--;
6852                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6853                 }
6854         }
6855 }
6856
6857 void
6858 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6859 {
6860         struct sctp_association *asoc;
6861         struct sctp_tmit_chunk *chk, *nchk;
6862         struct sctp_asconf_chunk *acp;
6863
6864         asoc = &stcb->asoc;
6865         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6866                 /* find SCTP_ASCONF chunk in queue */
6867                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6868                         if (chk->data) {
6869                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6870                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6871                                         /* Not Acked yet */
6872                                         break;
6873                                 }
6874                         }
6875                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6876                         if (chk->data) {
6877                                 sctp_m_freem(chk->data);
6878                                 chk->data = NULL;
6879                         }
6880                         asoc->ctrl_queue_cnt--;
6881                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6882                 }
6883         }
6884 }
6885
6886
6887 static void
6888 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6889     struct sctp_association *asoc,
6890     struct sctp_tmit_chunk **data_list,
6891     int bundle_at,
6892     struct sctp_nets *net)
6893 {
6894         int i;
6895         struct sctp_tmit_chunk *tp1;
6896
6897         for (i = 0; i < bundle_at; i++) {
6898                 /* off of the send queue */
6899                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6900                 asoc->send_queue_cnt--;
6901                 if (i > 0) {
6902                         /*
6903                          * Any chunk NOT 0 you zap the time chunk 0 gets
6904                          * zapped or set based on if a RTO measurment is
6905                          * needed.
6906                          */
6907                         data_list[i]->do_rtt = 0;
6908                 }
6909                 /* record time */
6910                 data_list[i]->sent_rcv_time = net->last_sent_time;
6911                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6912                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6913                 if (data_list[i]->whoTo == NULL) {
6914                         data_list[i]->whoTo = net;
6915                         atomic_add_int(&net->ref_count, 1);
6916                 }
6917                 /* on to the sent queue */
6918                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6919                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6920                         struct sctp_tmit_chunk *tpp;
6921
6922                         /* need to move back */
6923         back_up_more:
6924                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6925                         if (tpp == NULL) {
6926                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6927                                 goto all_done;
6928                         }
6929                         tp1 = tpp;
6930                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6931                                 goto back_up_more;
6932                         }
6933                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6934                 } else {
6935                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6936                             data_list[i],
6937                             sctp_next);
6938                 }
6939 all_done:
6940                 /* This does not lower until the cum-ack passes it */
6941                 asoc->sent_queue_cnt++;
6942                 if ((asoc->peers_rwnd <= 0) &&
6943                     (asoc->total_flight == 0) &&
6944                     (bundle_at == 1)) {
6945                         /* Mark the chunk as being a window probe */
6946                         SCTP_STAT_INCR(sctps_windowprobed);
6947                 }
6948 #ifdef SCTP_AUDITING_ENABLED
6949                 sctp_audit_log(0xC2, 3);
6950 #endif
6951                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6952                 data_list[i]->snd_count = 1;
6953                 data_list[i]->rec.data.chunk_was_revoked = 0;
6954                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6955                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6956                             data_list[i]->whoTo->flight_size,
6957                             data_list[i]->book_size,
6958                             (uintptr_t) data_list[i]->whoTo,
6959                             data_list[i]->rec.data.TSN_seq);
6960                 }
6961                 sctp_flight_size_increase(data_list[i]);
6962                 sctp_total_flight_increase(stcb, data_list[i]);
6963                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6964                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6965                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6966                 }
6967                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6968                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6969                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6970                         /* SWS sender side engages */
6971                         asoc->peers_rwnd = 0;
6972                 }
6973         }
6974         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6975                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6976         }
6977 }
6978
6979 static void
6980 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6981 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6982     SCTP_UNUSED
6983 #endif
6984 )
6985 {
6986         struct sctp_tmit_chunk *chk, *nchk;
6987
6988         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6989                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6990                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6991                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6992                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6993                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6994                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6995                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6996                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6997                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6998                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6999                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7000                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7001                         /* Stray chunks must be cleaned up */
7002         clean_up_anyway:
7003                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7004                         if (chk->data) {
7005                                 sctp_m_freem(chk->data);
7006                                 chk->data = NULL;
7007                         }
7008                         asoc->ctrl_queue_cnt--;
7009                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7010                                 asoc->fwd_tsn_cnt--;
7011                         sctp_free_a_chunk(stcb, chk, so_locked);
7012                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7013                         /* special handling, we must look into the param */
7014                         if (chk != asoc->str_reset) {
7015                                 goto clean_up_anyway;
7016                         }
7017                 }
7018         }
7019 }
7020
7021
7022 static int
7023 sctp_can_we_split_this(struct sctp_tcb *stcb,
7024     uint32_t length,
7025     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7026 {
7027         /*
7028          * Make a decision on if I should split a msg into multiple parts.
7029          * This is only asked of incomplete messages.
7030          */
7031         if (eeor_on) {
7032                 /*
7033                  * If we are doing EEOR we need to always send it if its the
7034                  * entire thing, since it might be all the guy is putting in
7035                  * the hopper.
7036                  */
7037                 if (goal_mtu >= length) {
7038                         /*-
7039                          * If we have data outstanding,
7040                          * we get another chance when the sack
7041                          * arrives to transmit - wait for more data
7042                          */
7043                         if (stcb->asoc.total_flight == 0) {
7044                                 /*
7045                                  * If nothing is in flight, we zero the
7046                                  * packet counter.
7047                                  */
7048                                 return (length);
7049                         }
7050                         return (0);
7051
7052                 } else {
7053                         /* You can fill the rest */
7054                         return (goal_mtu);
7055                 }
7056         }
7057         /*-
7058          * For those strange folk that make the send buffer
7059          * smaller than our fragmentation point, we can't
7060          * get a full msg in so we have to allow splitting.
7061          */
7062         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7063                 return (length);
7064         }
7065         if ((length <= goal_mtu) ||
7066             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7067                 /* Sub-optimial residual don't split in non-eeor mode. */
7068                 return (0);
7069         }
7070         /*
7071          * If we reach here length is larger than the goal_mtu. Do we wish
7072          * to split it for the sake of packet putting together?
7073          */
7074         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7075                 /* Its ok to split it */
7076                 return (min(goal_mtu, frag_point));
7077         }
7078         /* Nope, can't split */
7079         return (0);
7080
7081 }
7082
7083 static uint32_t
7084 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7085     struct sctp_stream_out *strq,
7086     uint32_t goal_mtu,
7087     uint32_t frag_point,
7088     int *locked,
7089     int *giveup,
7090     int eeor_mode,
7091     int *bail,
7092     int so_locked
7093 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7094     SCTP_UNUSED
7095 #endif
7096 )
7097 {
7098         /* Move from the stream to the send_queue keeping track of the total */
7099         struct sctp_association *asoc;
7100         struct sctp_stream_queue_pending *sp;
7101         struct sctp_tmit_chunk *chk;
7102         struct sctp_data_chunk *dchkh;
7103         uint32_t to_move, length;
7104         uint8_t rcv_flags = 0;
7105         uint8_t some_taken;
7106         uint8_t send_lock_up = 0;
7107
7108         SCTP_TCB_LOCK_ASSERT(stcb);
7109         asoc = &stcb->asoc;
7110 one_more_time:
7111         /* sa_ignore FREED_MEMORY */
7112         sp = TAILQ_FIRST(&strq->outqueue);
7113         if (sp == NULL) {
7114                 *locked = 0;
7115                 if (send_lock_up == 0) {
7116                         SCTP_TCB_SEND_LOCK(stcb);
7117                         send_lock_up = 1;
7118                 }
7119                 sp = TAILQ_FIRST(&strq->outqueue);
7120                 if (sp) {
7121                         goto one_more_time;
7122                 }
7123                 if (strq->last_msg_incomplete) {
7124                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7125                             strq->stream_no,
7126                             strq->last_msg_incomplete);
7127                         strq->last_msg_incomplete = 0;
7128                 }
7129                 to_move = 0;
7130                 if (send_lock_up) {
7131                         SCTP_TCB_SEND_UNLOCK(stcb);
7132                         send_lock_up = 0;
7133                 }
7134                 goto out_of;
7135         }
7136         if ((sp->msg_is_complete) && (sp->length == 0)) {
7137                 if (sp->sender_all_done) {
7138                         /*
7139                          * We are doing differed cleanup. Last time through
7140                          * when we took all the data the sender_all_done was
7141                          * not set.
7142                          */
7143                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7144                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7145                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7146                                     sp->sender_all_done,
7147                                     sp->length,
7148                                     sp->msg_is_complete,
7149                                     sp->put_last_out,
7150                                     send_lock_up);
7151                         }
7152                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7153                                 SCTP_TCB_SEND_LOCK(stcb);
7154                                 send_lock_up = 1;
7155                         }
7156                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7157                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7158                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7159                         if (sp->net) {
7160                                 sctp_free_remote_addr(sp->net);
7161                                 sp->net = NULL;
7162                         }
7163                         if (sp->data) {
7164                                 sctp_m_freem(sp->data);
7165                                 sp->data = NULL;
7166                         }
7167                         sctp_free_a_strmoq(stcb, sp, so_locked);
7168                         /* we can't be locked to it */
7169                         *locked = 0;
7170                         stcb->asoc.locked_on_sending = NULL;
7171                         if (send_lock_up) {
7172                                 SCTP_TCB_SEND_UNLOCK(stcb);
7173                                 send_lock_up = 0;
7174                         }
7175                         /* back to get the next msg */
7176                         goto one_more_time;
7177                 } else {
7178                         /*
7179                          * sender just finished this but still holds a
7180                          * reference
7181                          */
7182                         *locked = 1;
7183                         *giveup = 1;
7184                         to_move = 0;
7185                         goto out_of;
7186                 }
7187         } else {
7188                 /* is there some to get */
7189                 if (sp->length == 0) {
7190                         /* no */
7191                         *locked = 1;
7192                         *giveup = 1;
7193                         to_move = 0;
7194                         goto out_of;
7195                 } else if (sp->discard_rest) {
7196                         if (send_lock_up == 0) {
7197                                 SCTP_TCB_SEND_LOCK(stcb);
7198                                 send_lock_up = 1;
7199                         }
7200                         /* Whack down the size */
7201                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7202                         if ((stcb->sctp_socket != NULL) && \
7203                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7204                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7205                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7206                         }
7207                         if (sp->data) {
7208                                 sctp_m_freem(sp->data);
7209                                 sp->data = NULL;
7210                                 sp->tail_mbuf = NULL;
7211                         }
7212                         sp->length = 0;
7213                         sp->some_taken = 1;
7214                         *locked = 1;
7215                         *giveup = 1;
7216                         to_move = 0;
7217                         goto out_of;
7218                 }
7219         }
7220         some_taken = sp->some_taken;
7221         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7222                 sp->msg_is_complete = 1;
7223         }
7224 re_look:
7225         length = sp->length;
7226         if (sp->msg_is_complete) {
7227                 /* The message is complete */
7228                 to_move = min(length, frag_point);
7229                 if (to_move == length) {
7230                         /* All of it fits in the MTU */
7231                         if (sp->some_taken) {
7232                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7233                                 sp->put_last_out = 1;
7234                         } else {
7235                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7236                                 sp->put_last_out = 1;
7237                         }
7238                 } else {
7239                         /* Not all of it fits, we fragment */
7240                         if (sp->some_taken == 0) {
7241                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7242                         }
7243                         sp->some_taken = 1;
7244                 }
7245         } else {
7246                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7247                 if (to_move) {
7248                         /*-
7249                          * We use a snapshot of length in case it
7250                          * is expanding during the compare.
7251                          */
7252                         uint32_t llen;
7253
7254                         llen = length;
7255                         if (to_move >= llen) {
7256                                 to_move = llen;
7257                                 if (send_lock_up == 0) {
7258                                         /*-
7259                                          * We are taking all of an incomplete msg
7260                                          * thus we need a send lock.
7261                                          */
7262                                         SCTP_TCB_SEND_LOCK(stcb);
7263                                         send_lock_up = 1;
7264                                         if (sp->msg_is_complete) {
7265                                                 /*
7266                                                  * the sender finished the
7267                                                  * msg
7268                                                  */
7269                                                 goto re_look;
7270                                         }
7271                                 }
7272                         }
7273                         if (sp->some_taken == 0) {
7274                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7275                                 sp->some_taken = 1;
7276                         }
7277                 } else {
7278                         /* Nothing to take. */
7279                         if (sp->some_taken) {
7280                                 *locked = 1;
7281                         }
7282                         *giveup = 1;
7283                         to_move = 0;
7284                         goto out_of;
7285                 }
7286         }
7287
7288         /* If we reach here, we can copy out a chunk */
7289         sctp_alloc_a_chunk(stcb, chk);
7290         if (chk == NULL) {
7291                 /* No chunk memory */
7292                 *giveup = 1;
7293                 to_move = 0;
7294                 goto out_of;
7295         }
7296         /*
7297          * Setup for unordered if needed by looking at the user sent info
7298          * flags.
7299          */
7300         if (sp->sinfo_flags & SCTP_UNORDERED) {
7301                 rcv_flags |= SCTP_DATA_UNORDERED;
7302         }
7303         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7304             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7305                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7306         }
7307         /* clear out the chunk before setting up */
7308         memset(chk, 0, sizeof(*chk));
7309         chk->rec.data.rcv_flags = rcv_flags;
7310
7311         if (to_move >= length) {
7312                 /* we think we can steal the whole thing */
7313                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7314                         SCTP_TCB_SEND_LOCK(stcb);
7315                         send_lock_up = 1;
7316                 }
7317                 if (to_move < sp->length) {
7318                         /* bail, it changed */
7319                         goto dont_do_it;
7320                 }
7321                 chk->data = sp->data;
7322                 chk->last_mbuf = sp->tail_mbuf;
7323                 /* register the stealing */
7324                 sp->data = sp->tail_mbuf = NULL;
7325         } else {
7326                 struct mbuf *m;
7327
7328 dont_do_it:
7329                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7330                 chk->last_mbuf = NULL;
7331                 if (chk->data == NULL) {
7332                         sp->some_taken = some_taken;
7333                         sctp_free_a_chunk(stcb, chk, so_locked);
7334                         *bail = 1;
7335                         to_move = 0;
7336                         goto out_of;
7337                 }
7338 #ifdef SCTP_MBUF_LOGGING
7339                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7340                         struct mbuf *mat;
7341
7342                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7343                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7344                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7345                                 }
7346                         }
7347                 }
7348 #endif
7349                 /* Pull off the data */
7350                 m_adj(sp->data, to_move);
7351                 /* Now lets work our way down and compact it */
7352                 m = sp->data;
7353                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7354                         sp->data = SCTP_BUF_NEXT(m);
7355                         SCTP_BUF_NEXT(m) = NULL;
7356                         if (sp->tail_mbuf == m) {
7357                                 /*-
7358                                  * Freeing tail? TSNH since
7359                                  * we supposedly were taking less
7360                                  * than the sp->length.
7361                                  */
7362 #ifdef INVARIANTS
7363                                 panic("Huh, freing tail? - TSNH");
7364 #else
7365                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7366                                 sp->tail_mbuf = sp->data = NULL;
7367                                 sp->length = 0;
7368 #endif
7369
7370                         }
7371                         sctp_m_free(m);
7372                         m = sp->data;
7373                 }
7374         }
7375         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7376                 chk->copy_by_ref = 1;
7377         } else {
7378                 chk->copy_by_ref = 0;
7379         }
7380         /*
7381          * get last_mbuf and counts of mb useage This is ugly but hopefully
7382          * its only one mbuf.
7383          */
7384         if (chk->last_mbuf == NULL) {
7385                 chk->last_mbuf = chk->data;
7386                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7387                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7388                 }
7389         }
7390         if (to_move > length) {
7391                 /*- This should not happen either
7392                  * since we always lower to_move to the size
7393                  * of sp->length if its larger.
7394                  */
7395 #ifdef INVARIANTS
7396                 panic("Huh, how can to_move be larger?");
7397 #else
7398                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7399                 sp->length = 0;
7400 #endif
7401         } else {
7402                 atomic_subtract_int(&sp->length, to_move);
7403         }
7404         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7405                 /* Not enough room for a chunk header, get some */
7406                 struct mbuf *m;
7407
7408                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7409                 if (m == NULL) {
7410                         /*
7411                          * we're in trouble here. _PREPEND below will free
7412                          * all the data if there is no leading space, so we
7413                          * must put the data back and restore.
7414                          */
7415                         if (send_lock_up == 0) {
7416                                 SCTP_TCB_SEND_LOCK(stcb);
7417                                 send_lock_up = 1;
7418                         }
7419                         if (chk->data == NULL) {
7420                                 /* unsteal the data */
7421                                 sp->data = chk->data;
7422                                 sp->tail_mbuf = chk->last_mbuf;
7423                         } else {
7424                                 struct mbuf *m_tmp;
7425
7426                                 /* reassemble the data */
7427                                 m_tmp = sp->data;
7428                                 sp->data = chk->data;
7429                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7430                         }
7431                         sp->some_taken = some_taken;
7432                         atomic_add_int(&sp->length, to_move);
7433                         chk->data = NULL;
7434                         *bail = 1;
7435                         sctp_free_a_chunk(stcb, chk, so_locked);
7436                         to_move = 0;
7437                         goto out_of;
7438                 } else {
7439                         SCTP_BUF_LEN(m) = 0;
7440                         SCTP_BUF_NEXT(m) = chk->data;
7441                         chk->data = m;
7442                         M_ALIGN(chk->data, 4);
7443                 }
7444         }
7445         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7446         if (chk->data == NULL) {
7447                 /* HELP, TSNH since we assured it would not above? */
7448 #ifdef INVARIANTS
7449                 panic("prepend failes HELP?");
7450 #else
7451                 SCTP_PRINTF("prepend fails HELP?\n");
7452                 sctp_free_a_chunk(stcb, chk, so_locked);
7453 #endif
7454                 *bail = 1;
7455                 to_move = 0;
7456                 goto out_of;
7457         }
7458         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7459         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7460         chk->book_size_scale = 0;
7461         chk->sent = SCTP_DATAGRAM_UNSENT;
7462
7463         chk->flags = 0;
7464         chk->asoc = &stcb->asoc;
7465         chk->pad_inplace = 0;
7466         chk->no_fr_allowed = 0;
7467         chk->rec.data.stream_seq = sp->strseq;
7468         chk->rec.data.stream_number = sp->stream;
7469         chk->rec.data.payloadtype = sp->ppid;
7470         chk->rec.data.context = sp->context;
7471         chk->rec.data.doing_fast_retransmit = 0;
7472
7473         chk->rec.data.timetodrop = sp->ts;
7474         chk->flags = sp->act_flags;
7475
7476         if (sp->net) {
7477                 chk->whoTo = sp->net;
7478                 atomic_add_int(&chk->whoTo->ref_count, 1);
7479         } else
7480                 chk->whoTo = NULL;
7481
7482         if (sp->holds_key_ref) {
7483                 chk->auth_keyid = sp->auth_keyid;
7484                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7485                 chk->holds_key_ref = 1;
7486         }
7487         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7488         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7489                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7490                     (uintptr_t) stcb, sp->length,
7491                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7492                     chk->rec.data.TSN_seq);
7493         }
7494         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7495         /*
7496          * Put the rest of the things in place now. Size was done earlier in
7497          * previous loop prior to padding.
7498          */
7499
7500 #ifdef SCTP_ASOCLOG_OF_TSNS
7501         SCTP_TCB_LOCK_ASSERT(stcb);
7502         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7503                 asoc->tsn_out_at = 0;
7504                 asoc->tsn_out_wrapped = 1;
7505         }
7506         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7507         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7508         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7509         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7510         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7511         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7512         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7513         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7514         asoc->tsn_out_at++;
7515 #endif
7516
7517         dchkh->ch.chunk_type = SCTP_DATA;
7518         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7519         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7520         dchkh->dp.stream_id = htons(strq->stream_no);
7521         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7522         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7523         dchkh->ch.chunk_length = htons(chk->send_size);
7524         /* Now advance the chk->send_size by the actual pad needed. */
7525         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7526                 /* need a pad */
7527                 struct mbuf *lm;
7528                 int pads;
7529
7530                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7531                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7532                         chk->pad_inplace = 1;
7533                 }
7534                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7535                         /* pad added an mbuf */
7536                         chk->last_mbuf = lm;
7537                 }
7538                 chk->send_size += pads;
7539         }
7540         /* We only re-set the policy if it is on */
7541         if (sp->pr_sctp_on) {
7542                 sctp_set_prsctp_policy(sp);
7543                 asoc->pr_sctp_cnt++;
7544                 chk->pr_sctp_on = 1;
7545         } else {
7546                 chk->pr_sctp_on = 0;
7547         }
7548         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7549                 /* All done pull and kill the message */
7550                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7551                 if (sp->put_last_out == 0) {
7552                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7553                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7554                             sp->sender_all_done,
7555                             sp->length,
7556                             sp->msg_is_complete,
7557                             sp->put_last_out,
7558                             send_lock_up);
7559                 }
7560                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7561                         SCTP_TCB_SEND_LOCK(stcb);
7562                         send_lock_up = 1;
7563                 }
7564                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7565                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7566                 if (sp->net) {
7567                         sctp_free_remote_addr(sp->net);
7568                         sp->net = NULL;
7569                 }
7570                 if (sp->data) {
7571                         sctp_m_freem(sp->data);
7572                         sp->data = NULL;
7573                 }
7574                 sctp_free_a_strmoq(stcb, sp, so_locked);
7575
7576                 /* we can't be locked to it */
7577                 *locked = 0;
7578                 stcb->asoc.locked_on_sending = NULL;
7579         } else {
7580                 /* more to go, we are locked */
7581                 *locked = 1;
7582         }
7583         asoc->chunks_on_out_queue++;
7584         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7585         asoc->send_queue_cnt++;
7586 out_of:
7587         if (send_lock_up) {
7588                 SCTP_TCB_SEND_UNLOCK(stcb);
7589         }
7590         return (to_move);
7591 }
7592
7593
7594 static void
7595 sctp_fill_outqueue(struct sctp_tcb *stcb,
7596     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7597 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7598     SCTP_UNUSED
7599 #endif
7600 )
7601 {
7602         struct sctp_association *asoc;
7603         struct sctp_stream_out *strq;
7604         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7605         int locked, giveup;
7606
7607         SCTP_TCB_LOCK_ASSERT(stcb);
7608         asoc = &stcb->asoc;
7609         switch (net->ro._l_addr.sa.sa_family) {
7610 #ifdef INET
7611         case AF_INET:
7612                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7613                 break;
7614 #endif
7615 #ifdef INET6
7616         case AF_INET6:
7617                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7618                 break;
7619 #endif
7620         default:
7621                 /* TSNH */
7622                 goal_mtu = net->mtu;
7623                 break;
7624         }
7625         /* Need an allowance for the data chunk header too */
7626         goal_mtu -= sizeof(struct sctp_data_chunk);
7627
7628         /* must make even word boundary */
7629         goal_mtu &= 0xfffffffc;
7630         if (asoc->locked_on_sending) {
7631                 /* We are stuck on one stream until the message completes. */
7632                 strq = asoc->locked_on_sending;
7633                 locked = 1;
7634         } else {
7635                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7636                 locked = 0;
7637         }
7638         while ((goal_mtu > 0) && strq) {
7639                 giveup = 0;
7640                 bail = 0;
7641                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7642                     &giveup, eeor_mode, &bail, so_locked);
7643                 if (moved_how_much)
7644                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7645
7646                 if (locked) {
7647                         asoc->locked_on_sending = strq;
7648                         if ((moved_how_much == 0) || (giveup) || bail)
7649                                 /* no more to move for now */
7650                                 break;
7651                 } else {
7652                         asoc->locked_on_sending = NULL;
7653                         if ((giveup) || bail) {
7654                                 break;
7655                         }
7656                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7657                         if (strq == NULL) {
7658                                 break;
7659                         }
7660                 }
7661                 total_moved += moved_how_much;
7662                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7663                 goal_mtu &= 0xfffffffc;
7664         }
7665         if (bail)
7666                 *quit_now = 1;
7667
7668         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7669
7670         if (total_moved == 0) {
7671                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7672                     (net == stcb->asoc.primary_destination)) {
7673                         /* ran dry for primary network net */
7674                         SCTP_STAT_INCR(sctps_primary_randry);
7675                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7676                         /* ran dry with CMT on */
7677                         SCTP_STAT_INCR(sctps_cmt_randry);
7678                 }
7679         }
7680 }
7681
7682 void
7683 sctp_fix_ecn_echo(struct sctp_association *asoc)
7684 {
7685         struct sctp_tmit_chunk *chk;
7686
7687         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7688                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7689                         chk->sent = SCTP_DATAGRAM_UNSENT;
7690                 }
7691         }
7692 }
7693
7694 void
7695 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7696 {
7697         struct sctp_association *asoc;
7698         struct sctp_tmit_chunk *chk;
7699         struct sctp_stream_queue_pending *sp;
7700         unsigned int i;
7701
7702         if (net == NULL) {
7703                 return;
7704         }
7705         asoc = &stcb->asoc;
7706         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7707                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7708                         if (sp->net == net) {
7709                                 sctp_free_remote_addr(sp->net);
7710                                 sp->net = NULL;
7711                         }
7712                 }
7713         }
7714         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7715                 if (chk->whoTo == net) {
7716                         sctp_free_remote_addr(chk->whoTo);
7717                         chk->whoTo = NULL;
7718                 }
7719         }
7720 }
7721
7722 int
7723 sctp_med_chunk_output(struct sctp_inpcb *inp,
7724     struct sctp_tcb *stcb,
7725     struct sctp_association *asoc,
7726     int *num_out,
7727     int *reason_code,
7728     int control_only, int from_where,
7729     struct timeval *now, int *now_filled, int frag_point, int so_locked
7730 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7731     SCTP_UNUSED
7732 #endif
7733 )
7734 {
7735         /*
7736          * Ok this is the generic chunk service queue. we must do the
7737          * following: - Service the stream queue that is next, moving any
7738          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7739          * LAST to the out queue in one pass) and assigning TSN's - Check to
7740          * see if the cwnd/rwnd allows any output, if so we go ahead and
7741          * fomulate and send the low level chunks. Making sure to combine
7742          * any control in the control chunk queue also.
7743          */
7744         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7745         struct mbuf *outchain, *endoutchain;
7746         struct sctp_tmit_chunk *chk, *nchk;
7747
7748         /* temp arrays for unlinking */
7749         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7750         int no_fragmentflg, error;
7751         unsigned int max_rwnd_per_dest, max_send_per_dest;
7752         int one_chunk, hbflag, skip_data_for_this_net;
7753         int asconf, cookie, no_out_cnt;
7754         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7755         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7756         int tsns_sent = 0;
7757         uint32_t auth_offset = 0;
7758         struct sctp_auth_chunk *auth = NULL;
7759         uint16_t auth_keyid;
7760         int override_ok = 1;
7761         int skip_fill_up = 0;
7762         int data_auth_reqd = 0;
7763
7764         /*
7765          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7766          * destination.
7767          */
7768         int quit_now = 0;
7769
7770         *num_out = 0;
7771         auth_keyid = stcb->asoc.authinfo.active_keyid;
7772
7773         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7774             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7775             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7776                 eeor_mode = 1;
7777         } else {
7778                 eeor_mode = 0;
7779         }
7780         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7781         /*
7782          * First lets prime the pump. For each destination, if there is room
7783          * in the flight size, attempt to pull an MTU's worth out of the
7784          * stream queues into the general send_queue
7785          */
7786 #ifdef SCTP_AUDITING_ENABLED
7787         sctp_audit_log(0xC2, 2);
7788 #endif
7789         SCTP_TCB_LOCK_ASSERT(stcb);
7790         hbflag = 0;
7791         if ((control_only) || (asoc->stream_reset_outstanding))
7792                 no_data_chunks = 1;
7793         else
7794                 no_data_chunks = 0;
7795
7796         /* Nothing to possible to send? */
7797         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7798             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7799             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7800             TAILQ_EMPTY(&asoc->send_queue) &&
7801             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7802 nothing_to_send:
7803                 *reason_code = 9;
7804                 return (0);
7805         }
7806         if (asoc->peers_rwnd == 0) {
7807                 /* No room in peers rwnd */
7808                 *reason_code = 1;
7809                 if (asoc->total_flight > 0) {
7810                         /* we are allowed one chunk in flight */
7811                         no_data_chunks = 1;
7812                 }
7813         }
7814         if (stcb->asoc.ecn_echo_cnt_onq) {
7815                 /* Record where a sack goes, if any */
7816                 if (no_data_chunks &&
7817                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7818                         /* Nothing but ECNe to send - we don't do that */
7819                         goto nothing_to_send;
7820                 }
7821                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7822                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7823                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7824                                 sack_goes_to = chk->whoTo;
7825                                 break;
7826                         }
7827                 }
7828         }
7829         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7830         if (stcb->sctp_socket)
7831                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7832         else
7833                 max_send_per_dest = 0;
7834         if (no_data_chunks == 0) {
7835                 /* How many non-directed chunks are there? */
7836                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7837                         if (chk->whoTo == NULL) {
7838                                 /*
7839                                  * We already have non-directed chunks on
7840                                  * the queue, no need to do a fill-up.
7841                                  */
7842                                 skip_fill_up = 1;
7843                                 break;
7844                         }
7845                 }
7846
7847         }
7848         if ((no_data_chunks == 0) &&
7849             (skip_fill_up == 0) &&
7850             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7851                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7852                         /*
7853                          * This for loop we are in takes in each net, if
7854                          * its's got space in cwnd and has data sent to it
7855                          * (when CMT is off) then it calls
7856                          * sctp_fill_outqueue for the net. This gets data on
7857                          * the send queue for that network.
7858                          *
7859                          * In sctp_fill_outqueue TSN's are assigned and data is
7860                          * copied out of the stream buffers. Note mostly
7861                          * copy by reference (we hope).
7862                          */
7863                         net->window_probe = 0;
7864                         if ((net != stcb->asoc.alternate) &&
7865                             ((net->dest_state & SCTP_ADDR_PF) ||
7866                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7867                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7868                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7869                                         sctp_log_cwnd(stcb, net, 1,
7870                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7871                                 }
7872                                 continue;
7873                         }
7874                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7875                             (net->flight_size == 0)) {
7876                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7877                         }
7878                         if (net->flight_size >= net->cwnd) {
7879                                 /* skip this network, no room - can't fill */
7880                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7881                                         sctp_log_cwnd(stcb, net, 3,
7882                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7883                                 }
7884                                 continue;
7885                         }
7886                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7887                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7888                         }
7889                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7890                         if (quit_now) {
7891                                 /* memory alloc failure */
7892                                 no_data_chunks = 1;
7893                                 break;
7894                         }
7895                 }
7896         }
7897         /* now service each destination and send out what we can for it */
7898         /* Nothing to send? */
7899         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7900             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7901             TAILQ_EMPTY(&asoc->send_queue)) {
7902                 *reason_code = 8;
7903                 return (0);
7904         }
7905         if (asoc->sctp_cmt_on_off > 0) {
7906                 /* get the last start point */
7907                 start_at = asoc->last_net_cmt_send_started;
7908                 if (start_at == NULL) {
7909                         /* null so to beginning */
7910                         start_at = TAILQ_FIRST(&asoc->nets);
7911                 } else {
7912                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7913                         if (start_at == NULL) {
7914                                 start_at = TAILQ_FIRST(&asoc->nets);
7915                         }
7916                 }
7917                 asoc->last_net_cmt_send_started = start_at;
7918         } else {
7919                 start_at = TAILQ_FIRST(&asoc->nets);
7920         }
7921         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7922                 if (chk->whoTo == NULL) {
7923                         if (asoc->alternate) {
7924                                 chk->whoTo = asoc->alternate;
7925                         } else {
7926                                 chk->whoTo = asoc->primary_destination;
7927                         }
7928                         atomic_add_int(&chk->whoTo->ref_count, 1);
7929                 }
7930         }
7931         old_start_at = NULL;
7932 again_one_more_time:
7933         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7934                 /* how much can we send? */
7935                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7936                 if (old_start_at && (old_start_at == net)) {
7937                         /* through list ocmpletely. */
7938                         break;
7939                 }
7940                 tsns_sent = 0xa;
7941                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7942                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7943                     (net->flight_size >= net->cwnd)) {
7944                         /*
7945                          * Nothing on control or asconf and flight is full,
7946                          * we can skip even in the CMT case.
7947                          */
7948                         continue;
7949                 }
7950                 bundle_at = 0;
7951                 endoutchain = outchain = NULL;
7952                 no_fragmentflg = 1;
7953                 one_chunk = 0;
7954                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7955                         skip_data_for_this_net = 1;
7956                 } else {
7957                         skip_data_for_this_net = 0;
7958                 }
7959                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7960                         /*
7961                          * if we have a route and an ifp check to see if we
7962                          * have room to send to this guy
7963                          */
7964                         struct ifnet *ifp;
7965
7966                         ifp = net->ro.ro_rt->rt_ifp;
7967                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7968                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7969                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7970                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7971                                 }
7972                                 continue;
7973                         }
7974                 }
7975                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7976 #ifdef INET
7977                 case AF_INET:
7978                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7979                         break;
7980 #endif
7981 #ifdef INET6
7982                 case AF_INET6:
7983                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7984                         break;
7985 #endif
7986                 default:
7987                         /* TSNH */
7988                         mtu = net->mtu;
7989                         break;
7990                 }
7991                 mx_mtu = mtu;
7992                 to_out = 0;
7993                 if (mtu > asoc->peers_rwnd) {
7994                         if (asoc->total_flight > 0) {
7995                                 /* We have a packet in flight somewhere */
7996                                 r_mtu = asoc->peers_rwnd;
7997                         } else {
7998                                 /* We are always allowed to send one MTU out */
7999                                 one_chunk = 1;
8000                                 r_mtu = mtu;
8001                         }
8002                 } else {
8003                         r_mtu = mtu;
8004                 }
8005                 /************************/
8006                 /* ASCONF transmission */
8007                 /************************/
8008                 /* Now first lets go through the asconf queue */
8009                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8010                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8011                                 continue;
8012                         }
8013                         if (chk->whoTo == NULL) {
8014                                 if (asoc->alternate == NULL) {
8015                                         if (asoc->primary_destination != net) {
8016                                                 break;
8017                                         }
8018                                 } else {
8019                                         if (asoc->alternate != net) {
8020                                                 break;
8021                                         }
8022                                 }
8023                         } else {
8024                                 if (chk->whoTo != net) {
8025                                         break;
8026                                 }
8027                         }
8028                         if (chk->data == NULL) {
8029                                 break;
8030                         }
8031                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8032                             chk->sent != SCTP_DATAGRAM_RESEND) {
8033                                 break;
8034                         }
8035                         /*
8036                          * if no AUTH is yet included and this chunk
8037                          * requires it, make sure to account for it.  We
8038                          * don't apply the size until the AUTH chunk is
8039                          * actually added below in case there is no room for
8040                          * this chunk. NOTE: we overload the use of "omtu"
8041                          * here
8042                          */
8043                         if ((auth == NULL) &&
8044                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8045                             stcb->asoc.peer_auth_chunks)) {
8046                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8047                         } else
8048                                 omtu = 0;
8049                         /* Here we do NOT factor the r_mtu */
8050                         if ((chk->send_size < (int)(mtu - omtu)) ||
8051                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8052                                 /*
8053                                  * We probably should glom the mbuf chain
8054                                  * from the chk->data for control but the
8055                                  * problem is it becomes yet one more level
8056                                  * of tracking to do if for some reason
8057                                  * output fails. Then I have got to
8058                                  * reconstruct the merged control chain.. el
8059                                  * yucko.. for now we take the easy way and
8060                                  * do the copy
8061                                  */
8062                                 /*
8063                                  * Add an AUTH chunk, if chunk requires it
8064                                  * save the offset into the chain for AUTH
8065                                  */
8066                                 if ((auth == NULL) &&
8067                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8068                                     stcb->asoc.peer_auth_chunks))) {
8069                                         outchain = sctp_add_auth_chunk(outchain,
8070                                             &endoutchain,
8071                                             &auth,
8072                                             &auth_offset,
8073                                             stcb,
8074                                             chk->rec.chunk_id.id);
8075                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8076                                 }
8077                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8078                                     (int)chk->rec.chunk_id.can_take_data,
8079                                     chk->send_size, chk->copy_by_ref);
8080                                 if (outchain == NULL) {
8081                                         *reason_code = 8;
8082                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8083                                         return (ENOMEM);
8084                                 }
8085                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8086                                 /* update our MTU size */
8087                                 if (mtu > (chk->send_size + omtu))
8088                                         mtu -= (chk->send_size + omtu);
8089                                 else
8090                                         mtu = 0;
8091                                 to_out += (chk->send_size + omtu);
8092                                 /* Do clear IP_DF ? */
8093                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8094                                         no_fragmentflg = 0;
8095                                 }
8096                                 if (chk->rec.chunk_id.can_take_data)
8097                                         chk->data = NULL;
8098                                 /*
8099                                  * set hb flag since we can use these for
8100                                  * RTO
8101                                  */
8102                                 hbflag = 1;
8103                                 asconf = 1;
8104                                 /*
8105                                  * should sysctl this: don't bundle data
8106                                  * with ASCONF since it requires AUTH
8107                                  */
8108                                 no_data_chunks = 1;
8109                                 chk->sent = SCTP_DATAGRAM_SENT;
8110                                 if (chk->whoTo == NULL) {
8111                                         chk->whoTo = net;
8112                                         atomic_add_int(&net->ref_count, 1);
8113                                 }
8114                                 chk->snd_count++;
8115                                 if (mtu == 0) {
8116                                         /*
8117                                          * Ok we are out of room but we can
8118                                          * output without effecting the
8119                                          * flight size since this little guy
8120                                          * is a control only packet.
8121                                          */
8122                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8123                                         /*
8124                                          * do NOT clear the asconf flag as
8125                                          * it is used to do appropriate
8126                                          * source address selection.
8127                                          */
8128                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8129                                             (struct sockaddr *)&net->ro._l_addr,
8130                                             outchain, auth_offset, auth,
8131                                             stcb->asoc.authinfo.active_keyid,
8132                                             no_fragmentflg, 0, asconf,
8133                                             inp->sctp_lport, stcb->rport,
8134                                             htonl(stcb->asoc.peer_vtag),
8135                                             net->port, so_locked, NULL, NULL))) {
8136                                                 if (error == ENOBUFS) {
8137                                                         asoc->ifp_had_enobuf = 1;
8138                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8139                                                 }
8140                                                 if (from_where == 0) {
8141                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8142                                                 }
8143                                                 if (*now_filled == 0) {
8144                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8145                                                         *now_filled = 1;
8146                                                         *now = net->last_sent_time;
8147                                                 } else {
8148                                                         net->last_sent_time = *now;
8149                                                 }
8150                                                 hbflag = 0;
8151                                                 /* error, could not output */
8152                                                 if (error == EHOSTUNREACH) {
8153                                                         /*
8154                                                          * Destination went
8155                                                          * unreachable
8156                                                          * during this send
8157                                                          */
8158                                                         sctp_move_chunks_from_net(stcb, net);
8159                                                 }
8160                                                 *reason_code = 7;
8161                                                 continue;
8162                                         } else
8163                                                 asoc->ifp_had_enobuf = 0;
8164                                         if (*now_filled == 0) {
8165                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8166                                                 *now_filled = 1;
8167                                                 *now = net->last_sent_time;
8168                                         } else {
8169                                                 net->last_sent_time = *now;
8170                                         }
8171                                         hbflag = 0;
8172                                         /*
8173                                          * increase the number we sent, if a
8174                                          * cookie is sent we don't tell them
8175                                          * any was sent out.
8176                                          */
8177                                         outchain = endoutchain = NULL;
8178                                         auth = NULL;
8179                                         auth_offset = 0;
8180                                         if (!no_out_cnt)
8181                                                 *num_out += ctl_cnt;
8182                                         /* recalc a clean slate and setup */
8183                                         switch (net->ro._l_addr.sa.sa_family) {
8184 #ifdef INET
8185                                         case AF_INET:
8186                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8187                                                 break;
8188 #endif
8189 #ifdef INET6
8190                                         case AF_INET6:
8191                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8192                                                 break;
8193 #endif
8194                                         default:
8195                                                 /* TSNH */
8196                                                 mtu = net->mtu;
8197                                                 break;
8198                                         }
8199                                         to_out = 0;
8200                                         no_fragmentflg = 1;
8201                                 }
8202                         }
8203                 }
8204                 /************************/
8205                 /* Control transmission */
8206                 /************************/
8207                 /* Now first lets go through the control queue */
8208                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8209                         if ((sack_goes_to) &&
8210                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8211                             (chk->whoTo != sack_goes_to)) {
8212                                 /*
8213                                  * if we have a sack in queue, and we are
8214                                  * looking at an ecn echo that is NOT queued
8215                                  * to where the sack is going..
8216                                  */
8217                                 if (chk->whoTo == net) {
8218                                         /*
8219                                          * Don't transmit it to where its
8220                                          * going (current net)
8221                                          */
8222                                         continue;
8223                                 } else if (sack_goes_to == net) {
8224                                         /*
8225                                          * But do transmit it to this
8226                                          * address
8227                                          */
8228                                         goto skip_net_check;
8229                                 }
8230                         }
8231                         if (chk->whoTo == NULL) {
8232                                 if (asoc->alternate == NULL) {
8233                                         if (asoc->primary_destination != net) {
8234                                                 continue;
8235                                         }
8236                                 } else {
8237                                         if (asoc->alternate != net) {
8238                                                 continue;
8239                                         }
8240                                 }
8241                         } else {
8242                                 if (chk->whoTo != net) {
8243                                         continue;
8244                                 }
8245                         }
8246         skip_net_check:
8247                         if (chk->data == NULL) {
8248                                 continue;
8249                         }
8250                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8251                                 /*
8252                                  * It must be unsent. Cookies and ASCONF's
8253                                  * hang around but there timers will force
8254                                  * when marked for resend.
8255                                  */
8256                                 continue;
8257                         }
8258                         /*
8259                          * if no AUTH is yet included and this chunk
8260                          * requires it, make sure to account for it.  We
8261                          * don't apply the size until the AUTH chunk is
8262                          * actually added below in case there is no room for
8263                          * this chunk. NOTE: we overload the use of "omtu"
8264                          * here
8265                          */
8266                         if ((auth == NULL) &&
8267                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8268                             stcb->asoc.peer_auth_chunks)) {
8269                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8270                         } else
8271                                 omtu = 0;
8272                         /* Here we do NOT factor the r_mtu */
8273                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8274                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8275                                 /*
8276                                  * We probably should glom the mbuf chain
8277                                  * from the chk->data for control but the
8278                                  * problem is it becomes yet one more level
8279                                  * of tracking to do if for some reason
8280                                  * output fails. Then I have got to
8281                                  * reconstruct the merged control chain.. el
8282                                  * yucko.. for now we take the easy way and
8283                                  * do the copy
8284                                  */
8285                                 /*
8286                                  * Add an AUTH chunk, if chunk requires it
8287                                  * save the offset into the chain for AUTH
8288                                  */
8289                                 if ((auth == NULL) &&
8290                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8291                                     stcb->asoc.peer_auth_chunks))) {
8292                                         outchain = sctp_add_auth_chunk(outchain,
8293                                             &endoutchain,
8294                                             &auth,
8295                                             &auth_offset,
8296                                             stcb,
8297                                             chk->rec.chunk_id.id);
8298                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8299                                 }
8300                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8301                                     (int)chk->rec.chunk_id.can_take_data,
8302                                     chk->send_size, chk->copy_by_ref);
8303                                 if (outchain == NULL) {
8304                                         *reason_code = 8;
8305                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8306                                         return (ENOMEM);
8307                                 }
8308                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8309                                 /* update our MTU size */
8310                                 if (mtu > (chk->send_size + omtu))
8311                                         mtu -= (chk->send_size + omtu);
8312                                 else
8313                                         mtu = 0;
8314                                 to_out += (chk->send_size + omtu);
8315                                 /* Do clear IP_DF ? */
8316                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8317                                         no_fragmentflg = 0;
8318                                 }
8319                                 if (chk->rec.chunk_id.can_take_data)
8320                                         chk->data = NULL;
8321                                 /* Mark things to be removed, if needed */
8322                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8323                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8324                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8325                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8326                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8327                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8328                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8329                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8330                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8331                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8332                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8333                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8334                                                 hbflag = 1;
8335                                         }
8336                                         /* remove these chunks at the end */
8337                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8338                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8339                                                 /* turn off the timer */
8340                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8341                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8342                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8343                                                 }
8344                                         }
8345                                         ctl_cnt++;
8346                                 } else {
8347                                         /*
8348                                          * Other chunks, since they have
8349                                          * timers running (i.e. COOKIE) we
8350                                          * just "trust" that it gets sent or
8351                                          * retransmitted.
8352                                          */
8353                                         ctl_cnt++;
8354                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8355                                                 cookie = 1;
8356                                                 no_out_cnt = 1;
8357                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8358                                                 /*
8359                                                  * Increment ecne send count
8360                                                  * here this means we may be
8361                                                  * over-zealous in our
8362                                                  * counting if the send
8363                                                  * fails, but its the best
8364                                                  * place to do it (we used
8365                                                  * to do it in the queue of
8366                                                  * the chunk, but that did
8367                                                  * not tell how many times
8368                                                  * it was sent.
8369                                                  */
8370                                                 SCTP_STAT_INCR(sctps_sendecne);
8371                                         }
8372                                         chk->sent = SCTP_DATAGRAM_SENT;
8373                                         if (chk->whoTo == NULL) {
8374                                                 chk->whoTo = net;
8375                                                 atomic_add_int(&net->ref_count, 1);
8376                                         }
8377                                         chk->snd_count++;
8378                                 }
8379                                 if (mtu == 0) {
8380                                         /*
8381                                          * Ok we are out of room but we can
8382                                          * output without effecting the
8383                                          * flight size since this little guy
8384                                          * is a control only packet.
8385                                          */
8386                                         if (asconf) {
8387                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8388                                                 /*
8389                                                  * do NOT clear the asconf
8390                                                  * flag as it is used to do
8391                                                  * appropriate source
8392                                                  * address selection.
8393                                                  */
8394                                         }
8395                                         if (cookie) {
8396                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8397                                                 cookie = 0;
8398                                         }
8399                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8400                                             (struct sockaddr *)&net->ro._l_addr,
8401                                             outchain,
8402                                             auth_offset, auth,
8403                                             stcb->asoc.authinfo.active_keyid,
8404                                             no_fragmentflg, 0, asconf,
8405                                             inp->sctp_lport, stcb->rport,
8406                                             htonl(stcb->asoc.peer_vtag),
8407                                             net->port, so_locked, NULL, NULL))) {
8408                                                 if (error == ENOBUFS) {
8409                                                         asoc->ifp_had_enobuf = 1;
8410                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8411                                                 }
8412                                                 if (from_where == 0) {
8413                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8414                                                 }
8415                                                 /* error, could not output */
8416                                                 if (hbflag) {
8417                                                         if (*now_filled == 0) {
8418                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8419                                                                 *now_filled = 1;
8420                                                                 *now = net->last_sent_time;
8421                                                         } else {
8422                                                                 net->last_sent_time = *now;
8423                                                         }
8424                                                         hbflag = 0;
8425                                                 }
8426                                                 if (error == EHOSTUNREACH) {
8427                                                         /*
8428                                                          * Destination went
8429                                                          * unreachable
8430                                                          * during this send
8431                                                          */
8432                                                         sctp_move_chunks_from_net(stcb, net);
8433                                                 }
8434                                                 *reason_code = 7;
8435                                                 continue;
8436                                         } else
8437                                                 asoc->ifp_had_enobuf = 0;
8438                                         /* Only HB or ASCONF advances time */
8439                                         if (hbflag) {
8440                                                 if (*now_filled == 0) {
8441                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8442                                                         *now_filled = 1;
8443                                                         *now = net->last_sent_time;
8444                                                 } else {
8445                                                         net->last_sent_time = *now;
8446                                                 }
8447                                                 hbflag = 0;
8448                                         }
8449                                         /*
8450                                          * increase the number we sent, if a
8451                                          * cookie is sent we don't tell them
8452                                          * any was sent out.
8453                                          */
8454                                         outchain = endoutchain = NULL;
8455                                         auth = NULL;
8456                                         auth_offset = 0;
8457                                         if (!no_out_cnt)
8458                                                 *num_out += ctl_cnt;
8459                                         /* recalc a clean slate and setup */
8460                                         switch (net->ro._l_addr.sa.sa_family) {
8461 #ifdef INET
8462                                         case AF_INET:
8463                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8464                                                 break;
8465 #endif
8466 #ifdef INET6
8467                                         case AF_INET6:
8468                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8469                                                 break;
8470 #endif
8471                                         default:
8472                                                 /* TSNH */
8473                                                 mtu = net->mtu;
8474                                                 break;
8475                                         }
8476                                         to_out = 0;
8477                                         no_fragmentflg = 1;
8478                                 }
8479                         }
8480                 }
8481                 /* JRI: if dest is in PF state, do not send data to it */
8482                 if ((asoc->sctp_cmt_on_off > 0) &&
8483                     (net != stcb->asoc.alternate) &&
8484                     (net->dest_state & SCTP_ADDR_PF)) {
8485                         goto no_data_fill;
8486                 }
8487                 if (net->flight_size >= net->cwnd) {
8488                         goto no_data_fill;
8489                 }
8490                 if ((asoc->sctp_cmt_on_off > 0) &&
8491                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8492                     (net->flight_size > max_rwnd_per_dest)) {
8493                         goto no_data_fill;
8494                 }
8495                 /*
8496                  * We need a specific accounting for the usage of the send
8497                  * buffer. We also need to check the number of messages per
8498                  * net. For now, this is better than nothing and it disabled
8499                  * by default...
8500                  */
8501                 if ((asoc->sctp_cmt_on_off > 0) &&
8502                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8503                     (max_send_per_dest > 0) &&
8504                     (net->flight_size > max_send_per_dest)) {
8505                         goto no_data_fill;
8506                 }
8507                 /*********************/
8508                 /* Data transmission */
8509                 /*********************/
8510                 /*
8511                  * if AUTH for DATA is required and no AUTH has been added
8512                  * yet, account for this in the mtu now... if no data can be
8513                  * bundled, this adjustment won't matter anyways since the
8514                  * packet will be going out...
8515                  */
8516                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8517                     stcb->asoc.peer_auth_chunks);
8518                 if (data_auth_reqd && (auth == NULL)) {
8519                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8520                 }
8521                 /* now lets add any data within the MTU constraints */
8522                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8523                 case AF_INET:
8524                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8525                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8526                         else
8527                                 omtu = 0;
8528                         break;
8529 #ifdef INET6
8530                 case AF_INET6:
8531                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8532                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8533                         else
8534                                 omtu = 0;
8535                         break;
8536 #endif
8537                 default:
8538                         /* TSNH */
8539                         omtu = 0;
8540                         break;
8541                 }
8542                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8543                     (skip_data_for_this_net == 0)) ||
8544                     (cookie)) {
8545                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8546                                 if (no_data_chunks) {
8547                                         /* let only control go out */
8548                                         *reason_code = 1;
8549                                         break;
8550                                 }
8551                                 if (net->flight_size >= net->cwnd) {
8552                                         /* skip this net, no room for data */
8553                                         *reason_code = 2;
8554                                         break;
8555                                 }
8556                                 if ((chk->whoTo != NULL) &&
8557                                     (chk->whoTo != net)) {
8558                                         /* Don't send the chunk on this net */
8559                                         continue;
8560                                 }
8561                                 if (asoc->sctp_cmt_on_off == 0) {
8562                                         if ((asoc->alternate) &&
8563                                             (asoc->alternate != net) &&
8564                                             (chk->whoTo == NULL)) {
8565                                                 continue;
8566                                         } else if ((net != asoc->primary_destination) &&
8567                                                     (asoc->alternate == NULL) &&
8568                                             (chk->whoTo == NULL)) {
8569                                                 continue;
8570                                         }
8571                                 }
8572                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8573                                         /*-
8574                                          * strange, we have a chunk that is
8575                                          * to big for its destination and
8576                                          * yet no fragment ok flag.
8577                                          * Something went wrong when the
8578                                          * PMTU changed...we did not mark
8579                                          * this chunk for some reason?? I
8580                                          * will fix it here by letting IP
8581                                          * fragment it for now and printing
8582                                          * a warning. This really should not
8583                                          * happen ...
8584                                          */
8585                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8586                                             chk->send_size, mtu);
8587                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8588                                 }
8589                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8590                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8591                                         struct sctp_data_chunk *dchkh;
8592
8593                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8594                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8595                                 }
8596                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8597                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8598                                         /* ok we will add this one */
8599
8600                                         /*
8601                                          * Add an AUTH chunk, if chunk
8602                                          * requires it, save the offset into
8603                                          * the chain for AUTH
8604                                          */
8605                                         if (data_auth_reqd) {
8606                                                 if (auth == NULL) {
8607                                                         outchain = sctp_add_auth_chunk(outchain,
8608                                                             &endoutchain,
8609                                                             &auth,
8610                                                             &auth_offset,
8611                                                             stcb,
8612                                                             SCTP_DATA);
8613                                                         auth_keyid = chk->auth_keyid;
8614                                                         override_ok = 0;
8615                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8616                                                 } else if (override_ok) {
8617                                                         /*
8618                                                          * use this data's
8619                                                          * keyid
8620                                                          */
8621                                                         auth_keyid = chk->auth_keyid;
8622                                                         override_ok = 0;
8623                                                 } else if (auth_keyid != chk->auth_keyid) {
8624                                                         /*
8625                                                          * different keyid,
8626                                                          * so done bundling
8627                                                          */
8628                                                         break;
8629                                                 }
8630                                         }
8631                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8632                                             chk->send_size, chk->copy_by_ref);
8633                                         if (outchain == NULL) {
8634                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8635                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8636                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8637                                                 }
8638                                                 *reason_code = 3;
8639                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8640                                                 return (ENOMEM);
8641                                         }
8642                                         /* upate our MTU size */
8643                                         /* Do clear IP_DF ? */
8644                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8645                                                 no_fragmentflg = 0;
8646                                         }
8647                                         /* unsigned subtraction of mtu */
8648                                         if (mtu > chk->send_size)
8649                                                 mtu -= chk->send_size;
8650                                         else
8651                                                 mtu = 0;
8652                                         /* unsigned subtraction of r_mtu */
8653                                         if (r_mtu > chk->send_size)
8654                                                 r_mtu -= chk->send_size;
8655                                         else
8656                                                 r_mtu = 0;
8657
8658                                         to_out += chk->send_size;
8659                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8660 #ifdef INVARIANTS
8661                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8662 #else
8663                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8664                                                     mx_mtu, to_out);
8665 #endif
8666                                         }
8667                                         chk->window_probe = 0;
8668                                         data_list[bundle_at++] = chk;
8669                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8670                                                 break;
8671                                         }
8672                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8673                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8674                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8675                                                 } else {
8676                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8677                                                 }
8678                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8679                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8680                                                         /*
8681                                                          * Count number of
8682                                                          * user msg's that
8683                                                          * were fragmented
8684                                                          * we do this by
8685                                                          * counting when we
8686                                                          * see a LAST
8687                                                          * fragment only.
8688                                                          */
8689                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8690                                         }
8691                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8692                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8693                                                         data_list[0]->window_probe = 1;
8694                                                         net->window_probe = 1;
8695                                                 }
8696                                                 break;
8697                                         }
8698                                 } else {
8699                                         /*
8700                                          * Must be sent in order of the
8701                                          * TSN's (on a network)
8702                                          */
8703                                         break;
8704                                 }
8705                         }       /* for (chunk gather loop for this net) */
8706                 }               /* if asoc.state OPEN */
8707 no_data_fill:
8708                 /* Is there something to send for this destination? */
8709                 if (outchain) {
8710                         /* We may need to start a control timer or two */
8711                         if (asconf) {
8712                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8713                                     stcb, net);
8714                                 /*
8715                                  * do NOT clear the asconf flag as it is
8716                                  * used to do appropriate source address
8717                                  * selection.
8718                                  */
8719                         }
8720                         if (cookie) {
8721                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8722                                 cookie = 0;
8723                         }
8724                         /* must start a send timer if data is being sent */
8725                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8726                                 /*
8727                                  * no timer running on this destination
8728                                  * restart it.
8729                                  */
8730                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8731                         }
8732                         /* Now send it, if there is anything to send :> */
8733                         if ((error = sctp_lowlevel_chunk_output(inp,
8734                             stcb,
8735                             net,
8736                             (struct sockaddr *)&net->ro._l_addr,
8737                             outchain,
8738                             auth_offset,
8739                             auth,
8740                             auth_keyid,
8741                             no_fragmentflg,
8742                             bundle_at,
8743                             asconf,
8744                             inp->sctp_lport, stcb->rport,
8745                             htonl(stcb->asoc.peer_vtag),
8746                             net->port, so_locked, NULL, NULL))) {
8747                                 /* error, we could not output */
8748                                 if (error == ENOBUFS) {
8749                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8750                                         asoc->ifp_had_enobuf = 1;
8751                                 }
8752                                 if (from_where == 0) {
8753                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8754                                 }
8755                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8756                                 if (hbflag) {
8757                                         if (*now_filled == 0) {
8758                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8759                                                 *now_filled = 1;
8760                                                 *now = net->last_sent_time;
8761                                         } else {
8762                                                 net->last_sent_time = *now;
8763                                         }
8764                                         hbflag = 0;
8765                                 }
8766                                 if (error == EHOSTUNREACH) {
8767                                         /*
8768                                          * Destination went unreachable
8769                                          * during this send
8770                                          */
8771                                         sctp_move_chunks_from_net(stcb, net);
8772                                 }
8773                                 *reason_code = 6;
8774                                 /*-
8775                                  * I add this line to be paranoid. As far as
8776                                  * I can tell the continue, takes us back to
8777                                  * the top of the for, but just to make sure
8778                                  * I will reset these again here.
8779                                  */
8780                                 ctl_cnt = bundle_at = 0;
8781                                 continue;       /* This takes us back to the
8782                                                  * for() for the nets. */
8783                         } else {
8784                                 asoc->ifp_had_enobuf = 0;
8785                         }
8786                         endoutchain = NULL;
8787                         auth = NULL;
8788                         auth_offset = 0;
8789                         if (bundle_at || hbflag) {
8790                                 /* For data/asconf and hb set time */
8791                                 if (*now_filled == 0) {
8792                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8793                                         *now_filled = 1;
8794                                         *now = net->last_sent_time;
8795                                 } else {
8796                                         net->last_sent_time = *now;
8797                                 }
8798                         }
8799                         if (!no_out_cnt) {
8800                                 *num_out += (ctl_cnt + bundle_at);
8801                         }
8802                         if (bundle_at) {
8803                                 /* setup for a RTO measurement */
8804                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8805                                 /* fill time if not already filled */
8806                                 if (*now_filled == 0) {
8807                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8808                                         *now_filled = 1;
8809                                         *now = asoc->time_last_sent;
8810                                 } else {
8811                                         asoc->time_last_sent = *now;
8812                                 }
8813                                 if (net->rto_needed) {
8814                                         data_list[0]->do_rtt = 1;
8815                                         net->rto_needed = 0;
8816                                 }
8817                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8818                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8819                         }
8820                         if (one_chunk) {
8821                                 break;
8822                         }
8823                 }
8824                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8825                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8826                 }
8827         }
8828         if (old_start_at == NULL) {
8829                 old_start_at = start_at;
8830                 start_at = TAILQ_FIRST(&asoc->nets);
8831                 if (old_start_at)
8832                         goto again_one_more_time;
8833         }
8834         /*
8835          * At the end there should be no NON timed chunks hanging on this
8836          * queue.
8837          */
8838         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8839                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8840         }
8841         if ((*num_out == 0) && (*reason_code == 0)) {
8842                 *reason_code = 4;
8843         } else {
8844                 *reason_code = 5;
8845         }
8846         sctp_clean_up_ctl(stcb, asoc, so_locked);
8847         return (0);
8848 }
8849
8850 void
8851 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8852 {
8853         /*-
8854          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8855          * the control chunk queue.
8856          */
8857         struct sctp_chunkhdr *hdr;
8858         struct sctp_tmit_chunk *chk;
8859         struct mbuf *mat;
8860
8861         SCTP_TCB_LOCK_ASSERT(stcb);
8862         sctp_alloc_a_chunk(stcb, chk);
8863         if (chk == NULL) {
8864                 /* no memory */
8865                 sctp_m_freem(op_err);
8866                 return;
8867         }
8868         chk->copy_by_ref = 0;
8869         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8870         if (op_err == NULL) {
8871                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8872                 return;
8873         }
8874         chk->send_size = 0;
8875         mat = op_err;
8876         while (mat != NULL) {
8877                 chk->send_size += SCTP_BUF_LEN(mat);
8878                 mat = SCTP_BUF_NEXT(mat);
8879         }
8880         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8881         chk->rec.chunk_id.can_take_data = 1;
8882         chk->sent = SCTP_DATAGRAM_UNSENT;
8883         chk->snd_count = 0;
8884         chk->flags = 0;
8885         chk->asoc = &stcb->asoc;
8886         chk->data = op_err;
8887         chk->whoTo = NULL;
8888         hdr = mtod(op_err, struct sctp_chunkhdr *);
8889         hdr->chunk_type = SCTP_OPERATION_ERROR;
8890         hdr->chunk_flags = 0;
8891         hdr->chunk_length = htons(chk->send_size);
8892         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8893             chk,
8894             sctp_next);
8895         chk->asoc->ctrl_queue_cnt++;
8896 }
8897
8898 int
8899 sctp_send_cookie_echo(struct mbuf *m,
8900     int offset,
8901     struct sctp_tcb *stcb,
8902     struct sctp_nets *net)
8903 {
8904         /*-
8905          * pull out the cookie and put it at the front of the control chunk
8906          * queue.
8907          */
8908         int at;
8909         struct mbuf *cookie;
8910         struct sctp_paramhdr parm, *phdr;
8911         struct sctp_chunkhdr *hdr;
8912         struct sctp_tmit_chunk *chk;
8913         uint16_t ptype, plen;
8914
8915         /* First find the cookie in the param area */
8916         cookie = NULL;
8917         at = offset + sizeof(struct sctp_init_chunk);
8918
8919         SCTP_TCB_LOCK_ASSERT(stcb);
8920         do {
8921                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8922                 if (phdr == NULL) {
8923                         return (-3);
8924                 }
8925                 ptype = ntohs(phdr->param_type);
8926                 plen = ntohs(phdr->param_length);
8927                 if (ptype == SCTP_STATE_COOKIE) {
8928                         int pad;
8929
8930                         /* found the cookie */
8931                         if ((pad = (plen % 4))) {
8932                                 plen += 4 - pad;
8933                         }
8934                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8935                         if (cookie == NULL) {
8936                                 /* No memory */
8937                                 return (-2);
8938                         }
8939 #ifdef SCTP_MBUF_LOGGING
8940                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8941                                 struct mbuf *mat;
8942
8943                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8944                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8945                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8946                                         }
8947                                 }
8948                         }
8949 #endif
8950                         break;
8951                 }
8952                 at += SCTP_SIZE32(plen);
8953         } while (phdr);
8954         if (cookie == NULL) {
8955                 /* Did not find the cookie */
8956                 return (-3);
8957         }
8958         /* ok, we got the cookie lets change it into a cookie echo chunk */
8959
8960         /* first the change from param to cookie */
8961         hdr = mtod(cookie, struct sctp_chunkhdr *);
8962         hdr->chunk_type = SCTP_COOKIE_ECHO;
8963         hdr->chunk_flags = 0;
8964         /* get the chunk stuff now and place it in the FRONT of the queue */
8965         sctp_alloc_a_chunk(stcb, chk);
8966         if (chk == NULL) {
8967                 /* no memory */
8968                 sctp_m_freem(cookie);
8969                 return (-5);
8970         }
8971         chk->copy_by_ref = 0;
8972         chk->send_size = plen;
8973         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8974         chk->rec.chunk_id.can_take_data = 0;
8975         chk->sent = SCTP_DATAGRAM_UNSENT;
8976         chk->snd_count = 0;
8977         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8978         chk->asoc = &stcb->asoc;
8979         chk->data = cookie;
8980         chk->whoTo = net;
8981         atomic_add_int(&chk->whoTo->ref_count, 1);
8982         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8983         chk->asoc->ctrl_queue_cnt++;
8984         return (0);
8985 }
8986
8987 void
8988 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8989     struct mbuf *m,
8990     int offset,
8991     int chk_length,
8992     struct sctp_nets *net)
8993 {
8994         /*
8995          * take a HB request and make it into a HB ack and send it.
8996          */
8997         struct mbuf *outchain;
8998         struct sctp_chunkhdr *chdr;
8999         struct sctp_tmit_chunk *chk;
9000
9001
9002         if (net == NULL)
9003                 /* must have a net pointer */
9004                 return;
9005
9006         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9007         if (outchain == NULL) {
9008                 /* gak out of memory */
9009                 return;
9010         }
9011 #ifdef SCTP_MBUF_LOGGING
9012         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9013                 struct mbuf *mat;
9014
9015                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9016                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9017                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9018                         }
9019                 }
9020         }
9021 #endif
9022         chdr = mtod(outchain, struct sctp_chunkhdr *);
9023         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9024         chdr->chunk_flags = 0;
9025         if (chk_length % 4) {
9026                 /* need pad */
9027                 uint32_t cpthis = 0;
9028                 int padlen;
9029
9030                 padlen = 4 - (chk_length % 4);
9031                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9032         }
9033         sctp_alloc_a_chunk(stcb, chk);
9034         if (chk == NULL) {
9035                 /* no memory */
9036                 sctp_m_freem(outchain);
9037                 return;
9038         }
9039         chk->copy_by_ref = 0;
9040         chk->send_size = chk_length;
9041         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9042         chk->rec.chunk_id.can_take_data = 1;
9043         chk->sent = SCTP_DATAGRAM_UNSENT;
9044         chk->snd_count = 0;
9045         chk->flags = 0;
9046         chk->asoc = &stcb->asoc;
9047         chk->data = outchain;
9048         chk->whoTo = net;
9049         atomic_add_int(&chk->whoTo->ref_count, 1);
9050         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9051         chk->asoc->ctrl_queue_cnt++;
9052 }
9053
9054 void
9055 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9056 {
9057         /* formulate and queue a cookie-ack back to sender */
9058         struct mbuf *cookie_ack;
9059         struct sctp_chunkhdr *hdr;
9060         struct sctp_tmit_chunk *chk;
9061
9062         cookie_ack = NULL;
9063         SCTP_TCB_LOCK_ASSERT(stcb);
9064
9065         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9066         if (cookie_ack == NULL) {
9067                 /* no mbuf's */
9068                 return;
9069         }
9070         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9071         sctp_alloc_a_chunk(stcb, chk);
9072         if (chk == NULL) {
9073                 /* no memory */
9074                 sctp_m_freem(cookie_ack);
9075                 return;
9076         }
9077         chk->copy_by_ref = 0;
9078         chk->send_size = sizeof(struct sctp_chunkhdr);
9079         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9080         chk->rec.chunk_id.can_take_data = 1;
9081         chk->sent = SCTP_DATAGRAM_UNSENT;
9082         chk->snd_count = 0;
9083         chk->flags = 0;
9084         chk->asoc = &stcb->asoc;
9085         chk->data = cookie_ack;
9086         if (chk->asoc->last_control_chunk_from != NULL) {
9087                 chk->whoTo = chk->asoc->last_control_chunk_from;
9088                 atomic_add_int(&chk->whoTo->ref_count, 1);
9089         } else {
9090                 chk->whoTo = NULL;
9091         }
9092         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9093         hdr->chunk_type = SCTP_COOKIE_ACK;
9094         hdr->chunk_flags = 0;
9095         hdr->chunk_length = htons(chk->send_size);
9096         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9097         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9098         chk->asoc->ctrl_queue_cnt++;
9099         return;
9100 }
9101
9102
9103 void
9104 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9105 {
9106         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9107         struct mbuf *m_shutdown_ack;
9108         struct sctp_shutdown_ack_chunk *ack_cp;
9109         struct sctp_tmit_chunk *chk;
9110
9111         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9112         if (m_shutdown_ack == NULL) {
9113                 /* no mbuf's */
9114                 return;
9115         }
9116         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9117         sctp_alloc_a_chunk(stcb, chk);
9118         if (chk == NULL) {
9119                 /* no memory */
9120                 sctp_m_freem(m_shutdown_ack);
9121                 return;
9122         }
9123         chk->copy_by_ref = 0;
9124         chk->send_size = sizeof(struct sctp_chunkhdr);
9125         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9126         chk->rec.chunk_id.can_take_data = 1;
9127         chk->sent = SCTP_DATAGRAM_UNSENT;
9128         chk->snd_count = 0;
9129         chk->flags = 0;
9130         chk->asoc = &stcb->asoc;
9131         chk->data = m_shutdown_ack;
9132         chk->whoTo = net;
9133         if (chk->whoTo) {
9134                 atomic_add_int(&chk->whoTo->ref_count, 1);
9135         }
9136         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9137         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9138         ack_cp->ch.chunk_flags = 0;
9139         ack_cp->ch.chunk_length = htons(chk->send_size);
9140         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9141         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9142         chk->asoc->ctrl_queue_cnt++;
9143         return;
9144 }
9145
9146 void
9147 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9148 {
9149         /* formulate and queue a SHUTDOWN to the sender */
9150         struct mbuf *m_shutdown;
9151         struct sctp_shutdown_chunk *shutdown_cp;
9152         struct sctp_tmit_chunk *chk;
9153
9154         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9155         if (m_shutdown == NULL) {
9156                 /* no mbuf's */
9157                 return;
9158         }
9159         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9160         sctp_alloc_a_chunk(stcb, chk);
9161         if (chk == NULL) {
9162                 /* no memory */
9163                 sctp_m_freem(m_shutdown);
9164                 return;
9165         }
9166         chk->copy_by_ref = 0;
9167         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9168         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9169         chk->rec.chunk_id.can_take_data = 1;
9170         chk->sent = SCTP_DATAGRAM_UNSENT;
9171         chk->snd_count = 0;
9172         chk->flags = 0;
9173         chk->asoc = &stcb->asoc;
9174         chk->data = m_shutdown;
9175         chk->whoTo = net;
9176         if (chk->whoTo) {
9177                 atomic_add_int(&chk->whoTo->ref_count, 1);
9178         }
9179         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9180         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9181         shutdown_cp->ch.chunk_flags = 0;
9182         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9183         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9184         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9185         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9186         chk->asoc->ctrl_queue_cnt++;
9187         return;
9188 }
9189
9190 void
9191 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9192 {
9193         /*
9194          * formulate and queue an ASCONF to the peer. ASCONF parameters
9195          * should be queued on the assoc queue.
9196          */
9197         struct sctp_tmit_chunk *chk;
9198         struct mbuf *m_asconf;
9199         int len;
9200
9201         SCTP_TCB_LOCK_ASSERT(stcb);
9202
9203         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9204             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9205                 /* can't send a new one if there is one in flight already */
9206                 return;
9207         }
9208         /* compose an ASCONF chunk, maximum length is PMTU */
9209         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9210         if (m_asconf == NULL) {
9211                 return;
9212         }
9213         sctp_alloc_a_chunk(stcb, chk);
9214         if (chk == NULL) {
9215                 /* no memory */
9216                 sctp_m_freem(m_asconf);
9217                 return;
9218         }
9219         chk->copy_by_ref = 0;
9220         chk->data = m_asconf;
9221         chk->send_size = len;
9222         chk->rec.chunk_id.id = SCTP_ASCONF;
9223         chk->rec.chunk_id.can_take_data = 0;
9224         chk->sent = SCTP_DATAGRAM_UNSENT;
9225         chk->snd_count = 0;
9226         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9227         chk->asoc = &stcb->asoc;
9228         chk->whoTo = net;
9229         if (chk->whoTo) {
9230                 atomic_add_int(&chk->whoTo->ref_count, 1);
9231         }
9232         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9233         chk->asoc->ctrl_queue_cnt++;
9234         return;
9235 }
9236
9237 void
9238 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9239 {
9240         /*
9241          * formulate and queue a asconf-ack back to sender. the asconf-ack
9242          * must be stored in the tcb.
9243          */
9244         struct sctp_tmit_chunk *chk;
9245         struct sctp_asconf_ack *ack, *latest_ack;
9246         struct mbuf *m_ack;
9247         struct sctp_nets *net = NULL;
9248
9249         SCTP_TCB_LOCK_ASSERT(stcb);
9250         /* Get the latest ASCONF-ACK */
9251         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9252         if (latest_ack == NULL) {
9253                 return;
9254         }
9255         if (latest_ack->last_sent_to != NULL &&
9256             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9257                 /* we're doing a retransmission */
9258                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9259                 if (net == NULL) {
9260                         /* no alternate */
9261                         if (stcb->asoc.last_control_chunk_from == NULL) {
9262                                 if (stcb->asoc.alternate) {
9263                                         net = stcb->asoc.alternate;
9264                                 } else {
9265                                         net = stcb->asoc.primary_destination;
9266                                 }
9267                         } else {
9268                                 net = stcb->asoc.last_control_chunk_from;
9269                         }
9270                 }
9271         } else {
9272                 /* normal case */
9273                 if (stcb->asoc.last_control_chunk_from == NULL) {
9274                         if (stcb->asoc.alternate) {
9275                                 net = stcb->asoc.alternate;
9276                         } else {
9277                                 net = stcb->asoc.primary_destination;
9278                         }
9279                 } else {
9280                         net = stcb->asoc.last_control_chunk_from;
9281                 }
9282         }
9283         latest_ack->last_sent_to = net;
9284
9285         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9286                 if (ack->data == NULL) {
9287                         continue;
9288                 }
9289                 /* copy the asconf_ack */
9290                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9291                 if (m_ack == NULL) {
9292                         /* couldn't copy it */
9293                         return;
9294                 }
9295 #ifdef SCTP_MBUF_LOGGING
9296                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9297                         struct mbuf *mat;
9298
9299                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9300                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9301                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9302                                 }
9303                         }
9304                 }
9305 #endif
9306
9307                 sctp_alloc_a_chunk(stcb, chk);
9308                 if (chk == NULL) {
9309                         /* no memory */
9310                         if (m_ack)
9311                                 sctp_m_freem(m_ack);
9312                         return;
9313                 }
9314                 chk->copy_by_ref = 0;
9315
9316                 chk->whoTo = net;
9317                 if (chk->whoTo) {
9318                         atomic_add_int(&chk->whoTo->ref_count, 1);
9319                 }
9320                 chk->data = m_ack;
9321                 chk->send_size = 0;
9322                 /* Get size */
9323                 chk->send_size = ack->len;
9324                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9325                 chk->rec.chunk_id.can_take_data = 1;
9326                 chk->sent = SCTP_DATAGRAM_UNSENT;
9327                 chk->snd_count = 0;
9328                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9329                 chk->asoc = &stcb->asoc;
9330
9331                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9332                 chk->asoc->ctrl_queue_cnt++;
9333         }
9334         return;
9335 }
9336
9337
9338 static int
9339 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9340     struct sctp_tcb *stcb,
9341     struct sctp_association *asoc,
9342     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9343 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9344     SCTP_UNUSED
9345 #endif
9346 )
9347 {
9348         /*-
9349          * send out one MTU of retransmission. If fast_retransmit is
9350          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9351          * rwnd. For a Cookie or Asconf in the control chunk queue we
9352          * retransmit them by themselves.
9353          *
9354          * For data chunks we will pick out the lowest TSN's in the sent_queue
9355          * marked for resend and bundle them all together (up to a MTU of
9356          * destination). The address to send to should have been
9357          * selected/changed where the retransmission was marked (i.e. in FR
9358          * or t3-timeout routines).
9359          */
9360         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9361         struct sctp_tmit_chunk *chk, *fwd;
9362         struct mbuf *m, *endofchain;
9363         struct sctp_nets *net = NULL;
9364         uint32_t tsns_sent = 0;
9365         int no_fragmentflg, bundle_at, cnt_thru;
9366         unsigned int mtu;
9367         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9368         struct sctp_auth_chunk *auth = NULL;
9369         uint32_t auth_offset = 0;
9370         uint16_t auth_keyid;
9371         int override_ok = 1;
9372         int data_auth_reqd = 0;
9373         uint32_t dmtu = 0;
9374
9375         SCTP_TCB_LOCK_ASSERT(stcb);
9376         tmr_started = ctl_cnt = bundle_at = error = 0;
9377         no_fragmentflg = 1;
9378         fwd_tsn = 0;
9379         *cnt_out = 0;
9380         fwd = NULL;
9381         endofchain = m = NULL;
9382         auth_keyid = stcb->asoc.authinfo.active_keyid;
9383 #ifdef SCTP_AUDITING_ENABLED
9384         sctp_audit_log(0xC3, 1);
9385 #endif
9386         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9387             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9388                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9389                     asoc->sent_queue_retran_cnt);
9390                 asoc->sent_queue_cnt = 0;
9391                 asoc->sent_queue_cnt_removeable = 0;
9392                 /* send back 0/0 so we enter normal transmission */
9393                 *cnt_out = 0;
9394                 return (0);
9395         }
9396         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9397                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9398                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9399                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9400                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9401                                 continue;
9402                         }
9403                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9404                                 if (chk != asoc->str_reset) {
9405                                         /*
9406                                          * not eligible for retran if its
9407                                          * not ours
9408                                          */
9409                                         continue;
9410                                 }
9411                         }
9412                         ctl_cnt++;
9413                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9414                                 fwd_tsn = 1;
9415                         }
9416                         /*
9417                          * Add an AUTH chunk, if chunk requires it save the
9418                          * offset into the chain for AUTH
9419                          */
9420                         if ((auth == NULL) &&
9421                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9422                             stcb->asoc.peer_auth_chunks))) {
9423                                 m = sctp_add_auth_chunk(m, &endofchain,
9424                                     &auth, &auth_offset,
9425                                     stcb,
9426                                     chk->rec.chunk_id.id);
9427                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9428                         }
9429                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9430                         break;
9431                 }
9432         }
9433         one_chunk = 0;
9434         cnt_thru = 0;
9435         /* do we have control chunks to retransmit? */
9436         if (m != NULL) {
9437                 /* Start a timer no matter if we suceed or fail */
9438                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9439                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9440                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9441                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9442                 chk->snd_count++;       /* update our count */
9443                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9444                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9445                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9446                     no_fragmentflg, 0, 0,
9447                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9448                     chk->whoTo->port, so_locked, NULL, NULL))) {
9449                         SCTP_STAT_INCR(sctps_lowlevelerr);
9450                         return (error);
9451                 }
9452                 endofchain = NULL;
9453                 auth = NULL;
9454                 auth_offset = 0;
9455                 /*
9456                  * We don't want to mark the net->sent time here since this
9457                  * we use this for HB and retrans cannot measure RTT
9458                  */
9459                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9460                 *cnt_out += 1;
9461                 chk->sent = SCTP_DATAGRAM_SENT;
9462                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9463                 if (fwd_tsn == 0) {
9464                         return (0);
9465                 } else {
9466                         /* Clean up the fwd-tsn list */
9467                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9468                         return (0);
9469                 }
9470         }
9471         /*
9472          * Ok, it is just data retransmission we need to do or that and a
9473          * fwd-tsn with it all.
9474          */
9475         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9476                 return (SCTP_RETRAN_DONE);
9477         }
9478         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9479             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9480                 /* not yet open, resend the cookie and that is it */
9481                 return (1);
9482         }
9483 #ifdef SCTP_AUDITING_ENABLED
9484         sctp_auditing(20, inp, stcb, NULL);
9485 #endif
9486         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9487         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9488                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9489                         /* No, not sent to this net or not ready for rtx */
9490                         continue;
9491                 }
9492                 if (chk->data == NULL) {
9493                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9494                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9495                         continue;
9496                 }
9497                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9498                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9499                         /* Gak, we have exceeded max unlucky retran, abort! */
9500                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9501                             chk->snd_count,
9502                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9503                         atomic_add_int(&stcb->asoc.refcnt, 1);
9504                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9505                         SCTP_TCB_LOCK(stcb);
9506                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9507                         return (SCTP_RETRAN_EXIT);
9508                 }
9509                 /* pick up the net */
9510                 net = chk->whoTo;
9511                 switch (net->ro._l_addr.sa.sa_family) {
9512 #ifdef INET
9513                 case AF_INET:
9514                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9515                         break;
9516 #endif
9517 #ifdef INET6
9518                 case AF_INET6:
9519                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9520                         break;
9521 #endif
9522                 default:
9523                         /* TSNH */
9524                         mtu = net->mtu;
9525                         break;
9526                 }
9527
9528                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9529                         /* No room in peers rwnd */
9530                         uint32_t tsn;
9531
9532                         tsn = asoc->last_acked_seq + 1;
9533                         if (tsn == chk->rec.data.TSN_seq) {
9534                                 /*
9535                                  * we make a special exception for this
9536                                  * case. The peer has no rwnd but is missing
9537                                  * the lowest chunk.. which is probably what
9538                                  * is holding up the rwnd.
9539                                  */
9540                                 goto one_chunk_around;
9541                         }
9542                         return (1);
9543                 }
9544 one_chunk_around:
9545                 if (asoc->peers_rwnd < mtu) {
9546                         one_chunk = 1;
9547                         if ((asoc->peers_rwnd == 0) &&
9548                             (asoc->total_flight == 0)) {
9549                                 chk->window_probe = 1;
9550                                 chk->whoTo->window_probe = 1;
9551                         }
9552                 }
9553 #ifdef SCTP_AUDITING_ENABLED
9554                 sctp_audit_log(0xC3, 2);
9555 #endif
9556                 bundle_at = 0;
9557                 m = NULL;
9558                 net->fast_retran_ip = 0;
9559                 if (chk->rec.data.doing_fast_retransmit == 0) {
9560                         /*
9561                          * if no FR in progress skip destination that have
9562                          * flight_size > cwnd.
9563                          */
9564                         if (net->flight_size >= net->cwnd) {
9565                                 continue;
9566                         }
9567                 } else {
9568                         /*
9569                          * Mark the destination net to have FR recovery
9570                          * limits put on it.
9571                          */
9572                         *fr_done = 1;
9573                         net->fast_retran_ip = 1;
9574                 }
9575
9576                 /*
9577                  * if no AUTH is yet included and this chunk requires it,
9578                  * make sure to account for it.  We don't apply the size
9579                  * until the AUTH chunk is actually added below in case
9580                  * there is no room for this chunk.
9581                  */
9582                 if (data_auth_reqd && (auth == NULL)) {
9583                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9584                 } else
9585                         dmtu = 0;
9586
9587                 if ((chk->send_size <= (mtu - dmtu)) ||
9588                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9589                         /* ok we will add this one */
9590                         if (data_auth_reqd) {
9591                                 if (auth == NULL) {
9592                                         m = sctp_add_auth_chunk(m,
9593                                             &endofchain,
9594                                             &auth,
9595                                             &auth_offset,
9596                                             stcb,
9597                                             SCTP_DATA);
9598                                         auth_keyid = chk->auth_keyid;
9599                                         override_ok = 0;
9600                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9601                                 } else if (override_ok) {
9602                                         auth_keyid = chk->auth_keyid;
9603                                         override_ok = 0;
9604                                 } else if (chk->auth_keyid != auth_keyid) {
9605                                         /* different keyid, so done bundling */
9606                                         break;
9607                                 }
9608                         }
9609                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9610                         if (m == NULL) {
9611                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9612                                 return (ENOMEM);
9613                         }
9614                         /* Do clear IP_DF ? */
9615                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9616                                 no_fragmentflg = 0;
9617                         }
9618                         /* upate our MTU size */
9619                         if (mtu > (chk->send_size + dmtu))
9620                                 mtu -= (chk->send_size + dmtu);
9621                         else
9622                                 mtu = 0;
9623                         data_list[bundle_at++] = chk;
9624                         if (one_chunk && (asoc->total_flight <= 0)) {
9625                                 SCTP_STAT_INCR(sctps_windowprobed);
9626                         }
9627                 }
9628                 if (one_chunk == 0) {
9629                         /*
9630                          * now are there anymore forward from chk to pick
9631                          * up?
9632                          */
9633                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9634                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9635                                         /* Nope, not for retran */
9636                                         continue;
9637                                 }
9638                                 if (fwd->whoTo != net) {
9639                                         /* Nope, not the net in question */
9640                                         continue;
9641                                 }
9642                                 if (data_auth_reqd && (auth == NULL)) {
9643                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9644                                 } else
9645                                         dmtu = 0;
9646                                 if (fwd->send_size <= (mtu - dmtu)) {
9647                                         if (data_auth_reqd) {
9648                                                 if (auth == NULL) {
9649                                                         m = sctp_add_auth_chunk(m,
9650                                                             &endofchain,
9651                                                             &auth,
9652                                                             &auth_offset,
9653                                                             stcb,
9654                                                             SCTP_DATA);
9655                                                         auth_keyid = fwd->auth_keyid;
9656                                                         override_ok = 0;
9657                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9658                                                 } else if (override_ok) {
9659                                                         auth_keyid = fwd->auth_keyid;
9660                                                         override_ok = 0;
9661                                                 } else if (fwd->auth_keyid != auth_keyid) {
9662                                                         /*
9663                                                          * different keyid,
9664                                                          * so done bundling
9665                                                          */
9666                                                         break;
9667                                                 }
9668                                         }
9669                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9670                                         if (m == NULL) {
9671                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9672                                                 return (ENOMEM);
9673                                         }
9674                                         /* Do clear IP_DF ? */
9675                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9676                                                 no_fragmentflg = 0;
9677                                         }
9678                                         /* upate our MTU size */
9679                                         if (mtu > (fwd->send_size + dmtu))
9680                                                 mtu -= (fwd->send_size + dmtu);
9681                                         else
9682                                                 mtu = 0;
9683                                         data_list[bundle_at++] = fwd;
9684                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9685                                                 break;
9686                                         }
9687                                 } else {
9688                                         /* can't fit so we are done */
9689                                         break;
9690                                 }
9691                         }
9692                 }
9693                 /* Is there something to send for this destination? */
9694                 if (m) {
9695                         /*
9696                          * No matter if we fail/or suceed we should start a
9697                          * timer. A failure is like a lost IP packet :-)
9698                          */
9699                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9700                                 /*
9701                                  * no timer running on this destination
9702                                  * restart it.
9703                                  */
9704                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9705                                 tmr_started = 1;
9706                         }
9707                         /* Now lets send it, if there is anything to send :> */
9708                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9709                             (struct sockaddr *)&net->ro._l_addr, m,
9710                             auth_offset, auth, auth_keyid,
9711                             no_fragmentflg, 0, 0,
9712                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9713                             net->port, so_locked, NULL, NULL))) {
9714                                 /* error, we could not output */
9715                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9716                                 return (error);
9717                         }
9718                         endofchain = NULL;
9719                         auth = NULL;
9720                         auth_offset = 0;
9721                         /* For HB's */
9722                         /*
9723                          * We don't want to mark the net->sent time here
9724                          * since this we use this for HB and retrans cannot
9725                          * measure RTT
9726                          */
9727                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9728
9729                         /* For auto-close */
9730                         cnt_thru++;
9731                         if (*now_filled == 0) {
9732                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9733                                 *now = asoc->time_last_sent;
9734                                 *now_filled = 1;
9735                         } else {
9736                                 asoc->time_last_sent = *now;
9737                         }
9738                         *cnt_out += bundle_at;
9739 #ifdef SCTP_AUDITING_ENABLED
9740                         sctp_audit_log(0xC4, bundle_at);
9741 #endif
9742                         if (bundle_at) {
9743                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9744                         }
9745                         for (i = 0; i < bundle_at; i++) {
9746                                 SCTP_STAT_INCR(sctps_sendretransdata);
9747                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9748                                 /*
9749                                  * When we have a revoked data, and we
9750                                  * retransmit it, then we clear the revoked
9751                                  * flag since this flag dictates if we
9752                                  * subtracted from the fs
9753                                  */
9754                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9755                                         /* Deflate the cwnd */
9756                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9757                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9758                                 }
9759                                 data_list[i]->snd_count++;
9760                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9761                                 /* record the time */
9762                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9763                                 if (data_list[i]->book_size_scale) {
9764                                         /*
9765                                          * need to double the book size on
9766                                          * this one
9767                                          */
9768                                         data_list[i]->book_size_scale = 0;
9769                                         /*
9770                                          * Since we double the booksize, we
9771                                          * must also double the output queue
9772                                          * size, since this get shrunk when
9773                                          * we free by this amount.
9774                                          */
9775                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9776                                         data_list[i]->book_size *= 2;
9777
9778
9779                                 } else {
9780                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9781                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9782                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9783                                         }
9784                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9785                                             (uint32_t) (data_list[i]->send_size +
9786                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9787                                 }
9788                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9789                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9790                                             data_list[i]->whoTo->flight_size,
9791                                             data_list[i]->book_size,
9792                                             (uintptr_t) data_list[i]->whoTo,
9793                                             data_list[i]->rec.data.TSN_seq);
9794                                 }
9795                                 sctp_flight_size_increase(data_list[i]);
9796                                 sctp_total_flight_increase(stcb, data_list[i]);
9797                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9798                                         /* SWS sender side engages */
9799                                         asoc->peers_rwnd = 0;
9800                                 }
9801                                 if ((i == 0) &&
9802                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9803                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9804                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9805                                             (tmr_started == 0)) {
9806                                                 /*-
9807                                                  * ok we just fast-retrans'd
9808                                                  * the lowest TSN, i.e the
9809                                                  * first on the list. In
9810                                                  * this case we want to give
9811                                                  * some more time to get a
9812                                                  * SACK back without a
9813                                                  * t3-expiring.
9814                                                  */
9815                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9816                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9817                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9818                                         }
9819                                 }
9820                         }
9821                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9822                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9823                         }
9824 #ifdef SCTP_AUDITING_ENABLED
9825                         sctp_auditing(21, inp, stcb, NULL);
9826 #endif
9827                 } else {
9828                         /* None will fit */
9829                         return (1);
9830                 }
9831                 if (asoc->sent_queue_retran_cnt <= 0) {
9832                         /* all done we have no more to retran */
9833                         asoc->sent_queue_retran_cnt = 0;
9834                         break;
9835                 }
9836                 if (one_chunk) {
9837                         /* No more room in rwnd */
9838                         return (1);
9839                 }
9840                 /* stop the for loop here. we sent out a packet */
9841                 break;
9842         }
9843         return (0);
9844 }
9845
9846 static void
9847 sctp_timer_validation(struct sctp_inpcb *inp,
9848     struct sctp_tcb *stcb,
9849     struct sctp_association *asoc)
9850 {
9851         struct sctp_nets *net;
9852
9853         /* Validate that a timer is running somewhere */
9854         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9855                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9856                         /* Here is a timer */
9857                         return;
9858                 }
9859         }
9860         SCTP_TCB_LOCK_ASSERT(stcb);
9861         /* Gak, we did not have a timer somewhere */
9862         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9863         if (asoc->alternate) {
9864                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9865         } else {
9866                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9867         }
9868         return;
9869 }
9870
9871 void
9872 sctp_chunk_output(struct sctp_inpcb *inp,
9873     struct sctp_tcb *stcb,
9874     int from_where,
9875     int so_locked
9876 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9877     SCTP_UNUSED
9878 #endif
9879 )
9880 {
9881         /*-
9882          * Ok this is the generic chunk service queue. we must do the
9883          * following:
9884          * - See if there are retransmits pending, if so we must
9885          *   do these first.
9886          * - Service the stream queue that is next, moving any
9887          *   message (note I must get a complete message i.e.
9888          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9889          *   TSN's
9890          * - Check to see if the cwnd/rwnd allows any output, if so we
9891          *   go ahead and fomulate and send the low level chunks. Making sure
9892          *   to combine any control in the control chunk queue also.
9893          */
9894         struct sctp_association *asoc;
9895         struct sctp_nets *net;
9896         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9897         unsigned int burst_cnt = 0;
9898         struct timeval now;
9899         int now_filled = 0;
9900         int nagle_on;
9901         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9902         int un_sent = 0;
9903         int fr_done;
9904         unsigned int tot_frs = 0;
9905
9906         asoc = &stcb->asoc;
9907         /* The Nagle algorithm is only applied when handling a send call. */
9908         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9909                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9910                         nagle_on = 0;
9911                 } else {
9912                         nagle_on = 1;
9913                 }
9914         } else {
9915                 nagle_on = 0;
9916         }
9917         SCTP_TCB_LOCK_ASSERT(stcb);
9918
9919         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9920
9921         if ((un_sent <= 0) &&
9922             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9923             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9924             (asoc->sent_queue_retran_cnt == 0)) {
9925                 /* Nothing to do unless there is something to be sent left */
9926                 return;
9927         }
9928         /*
9929          * Do we have something to send, data or control AND a sack timer
9930          * running, if so piggy-back the sack.
9931          */
9932         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9933                 sctp_send_sack(stcb, so_locked);
9934                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9935         }
9936         while (asoc->sent_queue_retran_cnt) {
9937                 /*-
9938                  * Ok, it is retransmission time only, we send out only ONE
9939                  * packet with a single call off to the retran code.
9940                  */
9941                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9942                         /*-
9943                          * Special hook for handling cookiess discarded
9944                          * by peer that carried data. Send cookie-ack only
9945                          * and then the next call with get the retran's.
9946                          */
9947                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9948                             from_where,
9949                             &now, &now_filled, frag_point, so_locked);
9950                         return;
9951                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9952                         /* if its not from a HB then do it */
9953                         fr_done = 0;
9954                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9955                         if (fr_done) {
9956                                 tot_frs++;
9957                         }
9958                 } else {
9959                         /*
9960                          * its from any other place, we don't allow retran
9961                          * output (only control)
9962                          */
9963                         ret = 1;
9964                 }
9965                 if (ret > 0) {
9966                         /* Can't send anymore */
9967                         /*-
9968                          * now lets push out control by calling med-level
9969                          * output once. this assures that we WILL send HB's
9970                          * if queued too.
9971                          */
9972                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9973                             from_where,
9974                             &now, &now_filled, frag_point, so_locked);
9975 #ifdef SCTP_AUDITING_ENABLED
9976                         sctp_auditing(8, inp, stcb, NULL);
9977 #endif
9978                         sctp_timer_validation(inp, stcb, asoc);
9979                         return;
9980                 }
9981                 if (ret < 0) {
9982                         /*-
9983                          * The count was off.. retran is not happening so do
9984                          * the normal retransmission.
9985                          */
9986 #ifdef SCTP_AUDITING_ENABLED
9987                         sctp_auditing(9, inp, stcb, NULL);
9988 #endif
9989                         if (ret == SCTP_RETRAN_EXIT) {
9990                                 return;
9991                         }
9992                         break;
9993                 }
9994                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9995                         /* Only one transmission allowed out of a timeout */
9996 #ifdef SCTP_AUDITING_ENABLED
9997                         sctp_auditing(10, inp, stcb, NULL);
9998 #endif
9999                         /* Push out any control */
10000                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10001                             &now, &now_filled, frag_point, so_locked);
10002                         return;
10003                 }
10004                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10005                         /* Hit FR burst limit */
10006                         return;
10007                 }
10008                 if ((num_out == 0) && (ret == 0)) {
10009                         /* No more retrans to send */
10010                         break;
10011                 }
10012         }
10013 #ifdef SCTP_AUDITING_ENABLED
10014         sctp_auditing(12, inp, stcb, NULL);
10015 #endif
10016         /* Check for bad destinations, if they exist move chunks around. */
10017         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10018                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10019                         /*-
10020                          * if possible move things off of this address we
10021                          * still may send below due to the dormant state but
10022                          * we try to find an alternate address to send to
10023                          * and if we have one we move all queued data on the
10024                          * out wheel to this alternate address.
10025                          */
10026                         if (net->ref_count > 1)
10027                                 sctp_move_chunks_from_net(stcb, net);
10028                 } else {
10029                         /*-
10030                          * if ((asoc->sat_network) || (net->addr_is_local))
10031                          * { burst_limit = asoc->max_burst *
10032                          * SCTP_SAT_NETWORK_BURST_INCR; }
10033                          */
10034                         if (asoc->max_burst > 0) {
10035                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10036                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10037                                                 /*
10038                                                  * JRS - Use the congestion
10039                                                  * control given in the
10040                                                  * congestion control module
10041                                                  */
10042                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10043                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10044                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10045                                                 }
10046                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10047                                         }
10048                                         net->fast_retran_ip = 0;
10049                                 } else {
10050                                         if (net->flight_size == 0) {
10051                                                 /*
10052                                                  * Should be decaying the
10053                                                  * cwnd here
10054                                                  */
10055                                                 ;
10056                                         }
10057                                 }
10058                         }
10059                 }
10060
10061         }
10062         burst_cnt = 0;
10063         do {
10064                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10065                     &reason_code, 0, from_where,
10066                     &now, &now_filled, frag_point, so_locked);
10067                 if (error) {
10068                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10069                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10070                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10071                         }
10072                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10073                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10074                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10075                         }
10076                         break;
10077                 }
10078                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10079
10080                 tot_out += num_out;
10081                 burst_cnt++;
10082                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10083                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10084                         if (num_out == 0) {
10085                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10086                         }
10087                 }
10088                 if (nagle_on) {
10089                         /*
10090                          * When the Nagle algorithm is used, look at how
10091                          * much is unsent, then if its smaller than an MTU
10092                          * and we have data in flight we stop, except if we
10093                          * are handling a fragmented user message.
10094                          */
10095                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10096                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10097                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10098                             (stcb->asoc.total_flight > 0) &&
10099                             ((stcb->asoc.locked_on_sending == NULL) ||
10100                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10101                                 break;
10102                         }
10103                 }
10104                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10105                     TAILQ_EMPTY(&asoc->send_queue) &&
10106                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10107                         /* Nothing left to send */
10108                         break;
10109                 }
10110                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10111                         /* Nothing left to send */
10112                         break;
10113                 }
10114         } while (num_out &&
10115             ((asoc->max_burst == 0) ||
10116             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10117             (burst_cnt < asoc->max_burst)));
10118
10119         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10120                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10121                         SCTP_STAT_INCR(sctps_maxburstqueued);
10122                         asoc->burst_limit_applied = 1;
10123                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10124                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10125                         }
10126                 } else {
10127                         asoc->burst_limit_applied = 0;
10128                 }
10129         }
10130         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10131                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10132         }
10133         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10134             tot_out);
10135
10136         /*-
10137          * Now we need to clean up the control chunk chain if a ECNE is on
10138          * it. It must be marked as UNSENT again so next call will continue
10139          * to send it until such time that we get a CWR, to remove it.
10140          */
10141         if (stcb->asoc.ecn_echo_cnt_onq)
10142                 sctp_fix_ecn_echo(asoc);
10143         return;
10144 }
10145
10146
10147 int
10148 sctp_output(
10149     struct sctp_inpcb *inp,
10150     struct mbuf *m,
10151     struct sockaddr *addr,
10152     struct mbuf *control,
10153     struct thread *p,
10154     int flags)
10155 {
10156         if (inp == NULL) {
10157                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10158                 return (EINVAL);
10159         }
10160         if (inp->sctp_socket == NULL) {
10161                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10162                 return (EINVAL);
10163         }
10164         return (sctp_sosend(inp->sctp_socket,
10165             addr,
10166             (struct uio *)NULL,
10167             m,
10168             control,
10169             flags, p
10170             ));
10171 }
10172
10173 void
10174 send_forward_tsn(struct sctp_tcb *stcb,
10175     struct sctp_association *asoc)
10176 {
10177         struct sctp_tmit_chunk *chk;
10178         struct sctp_forward_tsn_chunk *fwdtsn;
10179         uint32_t advance_peer_ack_point;
10180
10181         SCTP_TCB_LOCK_ASSERT(stcb);
10182         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10183                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10184                         /* mark it to unsent */
10185                         chk->sent = SCTP_DATAGRAM_UNSENT;
10186                         chk->snd_count = 0;
10187                         /* Do we correct its output location? */
10188                         if (chk->whoTo) {
10189                                 sctp_free_remote_addr(chk->whoTo);
10190                                 chk->whoTo = NULL;
10191                         }
10192                         goto sctp_fill_in_rest;
10193                 }
10194         }
10195         /* Ok if we reach here we must build one */
10196         sctp_alloc_a_chunk(stcb, chk);
10197         if (chk == NULL) {
10198                 return;
10199         }
10200         asoc->fwd_tsn_cnt++;
10201         chk->copy_by_ref = 0;
10202         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10203         chk->rec.chunk_id.can_take_data = 0;
10204         chk->asoc = asoc;
10205         chk->whoTo = NULL;
10206         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10207         if (chk->data == NULL) {
10208                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10209                 return;
10210         }
10211         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10212         chk->sent = SCTP_DATAGRAM_UNSENT;
10213         chk->snd_count = 0;
10214         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10215         asoc->ctrl_queue_cnt++;
10216 sctp_fill_in_rest:
10217         /*-
10218          * Here we go through and fill out the part that deals with
10219          * stream/seq of the ones we skip.
10220          */
10221         SCTP_BUF_LEN(chk->data) = 0;
10222         {
10223                 struct sctp_tmit_chunk *at, *tp1, *last;
10224                 struct sctp_strseq *strseq;
10225                 unsigned int cnt_of_space, i, ovh;
10226                 unsigned int space_needed;
10227                 unsigned int cnt_of_skipped = 0;
10228
10229                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10230                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10231                                 /* no more to look at */
10232                                 break;
10233                         }
10234                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10235                                 /* We don't report these */
10236                                 continue;
10237                         }
10238                         cnt_of_skipped++;
10239                 }
10240                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10241                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10242
10243                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10244
10245                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10246                         ovh = SCTP_MIN_OVERHEAD;
10247                 } else {
10248                         ovh = SCTP_MIN_V4_OVERHEAD;
10249                 }
10250                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10251                         /* trim to a mtu size */
10252                         cnt_of_space = asoc->smallest_mtu - ovh;
10253                 }
10254                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10255                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10256                             0xff, 0, cnt_of_skipped,
10257                             asoc->advanced_peer_ack_point);
10258
10259                 }
10260                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10261                 if (cnt_of_space < space_needed) {
10262                         /*-
10263                          * ok we must trim down the chunk by lowering the
10264                          * advance peer ack point.
10265                          */
10266                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10267                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10268                                     0xff, 0xff, cnt_of_space,
10269                                     space_needed);
10270                         }
10271                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10272                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10273                         /*-
10274                          * Go through and find the TSN that will be the one
10275                          * we report.
10276                          */
10277                         at = TAILQ_FIRST(&asoc->sent_queue);
10278                         if (at != NULL) {
10279                                 for (i = 0; i < cnt_of_skipped; i++) {
10280                                         tp1 = TAILQ_NEXT(at, sctp_next);
10281                                         if (tp1 == NULL) {
10282                                                 break;
10283                                         }
10284                                         at = tp1;
10285                                 }
10286                         }
10287                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10288                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10289                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10290                                     asoc->advanced_peer_ack_point);
10291                         }
10292                         last = at;
10293                         /*-
10294                          * last now points to last one I can report, update
10295                          * peer ack point
10296                          */
10297                         if (last)
10298                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10299                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10300                             cnt_of_skipped * sizeof(struct sctp_strseq);
10301                 }
10302                 chk->send_size = space_needed;
10303                 /* Setup the chunk */
10304                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10305                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10306                 fwdtsn->ch.chunk_flags = 0;
10307                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10308                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10309                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10310                 fwdtsn++;
10311                 /*-
10312                  * Move pointer to after the fwdtsn and transfer to the
10313                  * strseq pointer.
10314                  */
10315                 strseq = (struct sctp_strseq *)fwdtsn;
10316                 /*-
10317                  * Now populate the strseq list. This is done blindly
10318                  * without pulling out duplicate stream info. This is
10319                  * inefficent but won't harm the process since the peer will
10320                  * look at these in sequence and will thus release anything.
10321                  * It could mean we exceed the PMTU and chop off some that
10322                  * we could have included.. but this is unlikely (aka 1432/4
10323                  * would mean 300+ stream seq's would have to be reported in
10324                  * one FWD-TSN. With a bit of work we can later FIX this to
10325                  * optimize and pull out duplcates.. but it does add more
10326                  * overhead. So for now... not!
10327                  */
10328                 at = TAILQ_FIRST(&asoc->sent_queue);
10329                 for (i = 0; i < cnt_of_skipped; i++) {
10330                         tp1 = TAILQ_NEXT(at, sctp_next);
10331                         if (tp1 == NULL)
10332                                 break;
10333                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10334                                 /* We don't report these */
10335                                 i--;
10336                                 at = tp1;
10337                                 continue;
10338                         }
10339                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10340                                 at->rec.data.fwd_tsn_cnt = 0;
10341                         }
10342                         strseq->stream = ntohs(at->rec.data.stream_number);
10343                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10344                         strseq++;
10345                         at = tp1;
10346                 }
10347         }
10348         return;
10349 }
10350
10351 void
10352 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10353 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10354     SCTP_UNUSED
10355 #endif
10356 )
10357 {
10358         /*-
10359          * Queue up a SACK or NR-SACK in the control queue.
10360          * We must first check to see if a SACK or NR-SACK is
10361          * somehow on the control queue.
10362          * If so, we will take and and remove the old one.
10363          */
10364         struct sctp_association *asoc;
10365         struct sctp_tmit_chunk *chk, *a_chk;
10366         struct sctp_sack_chunk *sack;
10367         struct sctp_nr_sack_chunk *nr_sack;
10368         struct sctp_gap_ack_block *gap_descriptor;
10369         struct sack_track *selector;
10370         int mergeable = 0;
10371         int offset;
10372         caddr_t limit;
10373         uint32_t *dup;
10374         int limit_reached = 0;
10375         unsigned int i, siz, j;
10376         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10377         int num_dups = 0;
10378         int space_req;
10379         uint32_t highest_tsn;
10380         uint8_t flags;
10381         uint8_t type;
10382         uint8_t tsn_map;
10383
10384         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10385             (stcb->asoc.peer_supports_nr_sack == 1)) {
10386                 type = SCTP_NR_SELECTIVE_ACK;
10387         } else {
10388                 type = SCTP_SELECTIVE_ACK;
10389         }
10390         a_chk = NULL;
10391         asoc = &stcb->asoc;
10392         SCTP_TCB_LOCK_ASSERT(stcb);
10393         if (asoc->last_data_chunk_from == NULL) {
10394                 /* Hmm we never received anything */
10395                 return;
10396         }
10397         sctp_slide_mapping_arrays(stcb);
10398         sctp_set_rwnd(stcb, asoc);
10399         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10400                 if (chk->rec.chunk_id.id == type) {
10401                         /* Hmm, found a sack already on queue, remove it */
10402                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10403                         asoc->ctrl_queue_cnt--;
10404                         a_chk = chk;
10405                         if (a_chk->data) {
10406                                 sctp_m_freem(a_chk->data);
10407                                 a_chk->data = NULL;
10408                         }
10409                         if (a_chk->whoTo) {
10410                                 sctp_free_remote_addr(a_chk->whoTo);
10411                                 a_chk->whoTo = NULL;
10412                         }
10413                         break;
10414                 }
10415         }
10416         if (a_chk == NULL) {
10417                 sctp_alloc_a_chunk(stcb, a_chk);
10418                 if (a_chk == NULL) {
10419                         /* No memory so we drop the idea, and set a timer */
10420                         if (stcb->asoc.delayed_ack) {
10421                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10422                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10423                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10424                                     stcb->sctp_ep, stcb, NULL);
10425                         } else {
10426                                 stcb->asoc.send_sack = 1;
10427                         }
10428                         return;
10429                 }
10430                 a_chk->copy_by_ref = 0;
10431                 a_chk->rec.chunk_id.id = type;
10432                 a_chk->rec.chunk_id.can_take_data = 1;
10433         }
10434         /* Clear our pkt counts */
10435         asoc->data_pkts_seen = 0;
10436
10437         a_chk->asoc = asoc;
10438         a_chk->snd_count = 0;
10439         a_chk->send_size = 0;   /* fill in later */
10440         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10441         a_chk->whoTo = NULL;
10442
10443         if ((asoc->numduptsns) ||
10444             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10445                 /*-
10446                  * Ok, we have some duplicates or the destination for the
10447                  * sack is unreachable, lets see if we can select an
10448                  * alternate than asoc->last_data_chunk_from
10449                  */
10450                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10451                     (asoc->used_alt_onsack > asoc->numnets)) {
10452                         /* We used an alt last time, don't this time */
10453                         a_chk->whoTo = NULL;
10454                 } else {
10455                         asoc->used_alt_onsack++;
10456                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10457                 }
10458                 if (a_chk->whoTo == NULL) {
10459                         /* Nope, no alternate */
10460                         a_chk->whoTo = asoc->last_data_chunk_from;
10461                         asoc->used_alt_onsack = 0;
10462                 }
10463         } else {
10464                 /*
10465                  * No duplicates so we use the last place we received data
10466                  * from.
10467                  */
10468                 asoc->used_alt_onsack = 0;
10469                 a_chk->whoTo = asoc->last_data_chunk_from;
10470         }
10471         if (a_chk->whoTo) {
10472                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10473         }
10474         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10475                 highest_tsn = asoc->highest_tsn_inside_map;
10476         } else {
10477                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10478         }
10479         if (highest_tsn == asoc->cumulative_tsn) {
10480                 /* no gaps */
10481                 if (type == SCTP_SELECTIVE_ACK) {
10482                         space_req = sizeof(struct sctp_sack_chunk);
10483                 } else {
10484                         space_req = sizeof(struct sctp_nr_sack_chunk);
10485                 }
10486         } else {
10487                 /* gaps get a cluster */
10488                 space_req = MCLBYTES;
10489         }
10490         /* Ok now lets formulate a MBUF with our sack */
10491         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10492         if ((a_chk->data == NULL) ||
10493             (a_chk->whoTo == NULL)) {
10494                 /* rats, no mbuf memory */
10495                 if (a_chk->data) {
10496                         /* was a problem with the destination */
10497                         sctp_m_freem(a_chk->data);
10498                         a_chk->data = NULL;
10499                 }
10500                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10501                 /* sa_ignore NO_NULL_CHK */
10502                 if (stcb->asoc.delayed_ack) {
10503                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10504                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10505                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10506                             stcb->sctp_ep, stcb, NULL);
10507                 } else {
10508                         stcb->asoc.send_sack = 1;
10509                 }
10510                 return;
10511         }
10512         /* ok, lets go through and fill it in */
10513         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10514         space = M_TRAILINGSPACE(a_chk->data);
10515         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10516                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10517         }
10518         limit = mtod(a_chk->data, caddr_t);
10519         limit += space;
10520
10521         flags = 0;
10522
10523         if ((asoc->sctp_cmt_on_off > 0) &&
10524             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10525                 /*-
10526                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10527                  * received, then set high bit to 1, else 0. Reset
10528                  * pkts_rcvd.
10529                  */
10530                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10531                 asoc->cmt_dac_pkts_rcvd = 0;
10532         }
10533 #ifdef SCTP_ASOCLOG_OF_TSNS
10534         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10535         stcb->asoc.cumack_log_atsnt++;
10536         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10537                 stcb->asoc.cumack_log_atsnt = 0;
10538         }
10539 #endif
10540         /* reset the readers interpretation */
10541         stcb->freed_by_sorcv_sincelast = 0;
10542
10543         if (type == SCTP_SELECTIVE_ACK) {
10544                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10545                 nr_sack = NULL;
10546                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10547                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10548                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10549                 } else {
10550                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10551                 }
10552         } else {
10553                 sack = NULL;
10554                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10555                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10556                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10557                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10558                 } else {
10559                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10560                 }
10561         }
10562
10563         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10564                 offset = 1;
10565         } else {
10566                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10567         }
10568         if (((type == SCTP_SELECTIVE_ACK) &&
10569             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10570             ((type == SCTP_NR_SELECTIVE_ACK) &&
10571             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10572                 /* we have a gap .. maybe */
10573                 for (i = 0; i < siz; i++) {
10574                         tsn_map = asoc->mapping_array[i];
10575                         if (type == SCTP_SELECTIVE_ACK) {
10576                                 tsn_map |= asoc->nr_mapping_array[i];
10577                         }
10578                         if (i == 0) {
10579                                 /*
10580                                  * Clear all bits corresponding to TSNs
10581                                  * smaller or equal to the cumulative TSN.
10582                                  */
10583                                 tsn_map &= (~0 << (1 - offset));
10584                         }
10585                         selector = &sack_array[tsn_map];
10586                         if (mergeable && selector->right_edge) {
10587                                 /*
10588                                  * Backup, left and right edges were ok to
10589                                  * merge.
10590                                  */
10591                                 num_gap_blocks--;
10592                                 gap_descriptor--;
10593                         }
10594                         if (selector->num_entries == 0)
10595                                 mergeable = 0;
10596                         else {
10597                                 for (j = 0; j < selector->num_entries; j++) {
10598                                         if (mergeable && selector->right_edge) {
10599                                                 /*
10600                                                  * do a merge by NOT setting
10601                                                  * the left side
10602                                                  */
10603                                                 mergeable = 0;
10604                                         } else {
10605                                                 /*
10606                                                  * no merge, set the left
10607                                                  * side
10608                                                  */
10609                                                 mergeable = 0;
10610                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10611                                         }
10612                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10613                                         num_gap_blocks++;
10614                                         gap_descriptor++;
10615                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10616                                                 /* no more room */
10617                                                 limit_reached = 1;
10618                                                 break;
10619                                         }
10620                                 }
10621                                 if (selector->left_edge) {
10622                                         mergeable = 1;
10623                                 }
10624                         }
10625                         if (limit_reached) {
10626                                 /* Reached the limit stop */
10627                                 break;
10628                         }
10629                         offset += 8;
10630                 }
10631         }
10632         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10633             (limit_reached == 0)) {
10634
10635                 mergeable = 0;
10636
10637                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10638                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10639                 } else {
10640                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10641                 }
10642
10643                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10644                         offset = 1;
10645                 } else {
10646                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10647                 }
10648                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10649                         /* we have a gap .. maybe */
10650                         for (i = 0; i < siz; i++) {
10651                                 tsn_map = asoc->nr_mapping_array[i];
10652                                 if (i == 0) {
10653                                         /*
10654                                          * Clear all bits corresponding to
10655                                          * TSNs smaller or equal to the
10656                                          * cumulative TSN.
10657                                          */
10658                                         tsn_map &= (~0 << (1 - offset));
10659                                 }
10660                                 selector = &sack_array[tsn_map];
10661                                 if (mergeable && selector->right_edge) {
10662                                         /*
10663                                          * Backup, left and right edges were
10664                                          * ok to merge.
10665                                          */
10666                                         num_nr_gap_blocks--;
10667                                         gap_descriptor--;
10668                                 }
10669                                 if (selector->num_entries == 0)
10670                                         mergeable = 0;
10671                                 else {
10672                                         for (j = 0; j < selector->num_entries; j++) {
10673                                                 if (mergeable && selector->right_edge) {
10674                                                         /*
10675                                                          * do a merge by NOT
10676                                                          * setting the left
10677                                                          * side
10678                                                          */
10679                                                         mergeable = 0;
10680                                                 } else {
10681                                                         /*
10682                                                          * no merge, set the
10683                                                          * left side
10684                                                          */
10685                                                         mergeable = 0;
10686                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10687                                                 }
10688                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10689                                                 num_nr_gap_blocks++;
10690                                                 gap_descriptor++;
10691                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10692                                                         /* no more room */
10693                                                         limit_reached = 1;
10694                                                         break;
10695                                                 }
10696                                         }
10697                                         if (selector->left_edge) {
10698                                                 mergeable = 1;
10699                                         }
10700                                 }
10701                                 if (limit_reached) {
10702                                         /* Reached the limit stop */
10703                                         break;
10704                                 }
10705                                 offset += 8;
10706                         }
10707                 }
10708         }
10709         /* now we must add any dups we are going to report. */
10710         if ((limit_reached == 0) && (asoc->numduptsns)) {
10711                 dup = (uint32_t *) gap_descriptor;
10712                 for (i = 0; i < asoc->numduptsns; i++) {
10713                         *dup = htonl(asoc->dup_tsns[i]);
10714                         dup++;
10715                         num_dups++;
10716                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10717                                 /* no more room */
10718                                 break;
10719                         }
10720                 }
10721                 asoc->numduptsns = 0;
10722         }
10723         /*
10724          * now that the chunk is prepared queue it to the control chunk
10725          * queue.
10726          */
10727         if (type == SCTP_SELECTIVE_ACK) {
10728                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10729                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10730                     num_dups * sizeof(int32_t);
10731                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10732                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10733                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10734                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10735                 sack->sack.num_dup_tsns = htons(num_dups);
10736                 sack->ch.chunk_type = type;
10737                 sack->ch.chunk_flags = flags;
10738                 sack->ch.chunk_length = htons(a_chk->send_size);
10739         } else {
10740                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10741                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10742                     num_dups * sizeof(int32_t);
10743                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10744                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10745                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10746                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10747                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10748                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10749                 nr_sack->nr_sack.reserved = 0;
10750                 nr_sack->ch.chunk_type = type;
10751                 nr_sack->ch.chunk_flags = flags;
10752                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10753         }
10754         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10755         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10756         asoc->ctrl_queue_cnt++;
10757         asoc->send_sack = 0;
10758         SCTP_STAT_INCR(sctps_sendsacks);
10759         return;
10760 }
10761
10762 void
10763 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10764 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10765     SCTP_UNUSED
10766 #endif
10767 )
10768 {
10769         struct mbuf *m_abort;
10770         struct mbuf *m_out = NULL, *m_end = NULL;
10771         struct sctp_abort_chunk *abort = NULL;
10772         int sz;
10773         uint32_t auth_offset = 0;
10774         struct sctp_auth_chunk *auth = NULL;
10775         struct sctp_nets *net;
10776
10777         /*-
10778          * Add an AUTH chunk, if chunk requires it and save the offset into
10779          * the chain for AUTH
10780          */
10781         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10782             stcb->asoc.peer_auth_chunks)) {
10783                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10784                     stcb, SCTP_ABORT_ASSOCIATION);
10785                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10786         }
10787         SCTP_TCB_LOCK_ASSERT(stcb);
10788         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10789         if (m_abort == NULL) {
10790                 /* no mbuf's */
10791                 if (m_out)
10792                         sctp_m_freem(m_out);
10793                 return;
10794         }
10795         /* link in any error */
10796         SCTP_BUF_NEXT(m_abort) = operr;
10797         sz = 0;
10798         if (operr) {
10799                 struct mbuf *n;
10800
10801                 n = operr;
10802                 while (n) {
10803                         sz += SCTP_BUF_LEN(n);
10804                         n = SCTP_BUF_NEXT(n);
10805                 }
10806         }
10807         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10808         if (m_out == NULL) {
10809                 /* NO Auth chunk prepended, so reserve space in front */
10810                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10811                 m_out = m_abort;
10812         } else {
10813                 /* Put AUTH chunk at the front of the chain */
10814                 SCTP_BUF_NEXT(m_end) = m_abort;
10815         }
10816         if (stcb->asoc.alternate) {
10817                 net = stcb->asoc.alternate;
10818         } else {
10819                 net = stcb->asoc.primary_destination;
10820         }
10821         /* fill in the ABORT chunk */
10822         abort = mtod(m_abort, struct sctp_abort_chunk *);
10823         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10824         abort->ch.chunk_flags = 0;
10825         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10826
10827         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10828             (struct sockaddr *)&net->ro._l_addr,
10829             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10830             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10831             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10832         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10833 }
10834
10835 void
10836 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10837     struct sctp_nets *net,
10838     int reflect_vtag)
10839 {
10840         /* formulate and SEND a SHUTDOWN-COMPLETE */
10841         struct mbuf *m_shutdown_comp;
10842         struct sctp_shutdown_complete_chunk *shutdown_complete;
10843         uint32_t vtag;
10844         uint8_t flags;
10845
10846         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10847         if (m_shutdown_comp == NULL) {
10848                 /* no mbuf's */
10849                 return;
10850         }
10851         if (reflect_vtag) {
10852                 flags = SCTP_HAD_NO_TCB;
10853                 vtag = stcb->asoc.my_vtag;
10854         } else {
10855                 flags = 0;
10856                 vtag = stcb->asoc.peer_vtag;
10857         }
10858         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10859         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10860         shutdown_complete->ch.chunk_flags = flags;
10861         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10862         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10863         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10864             (struct sockaddr *)&net->ro._l_addr,
10865             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10866             stcb->sctp_ep->sctp_lport, stcb->rport,
10867             htonl(vtag),
10868             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10869         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10870         return;
10871 }
10872
10873 void
10874 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
10875     uint32_t vrf_id, uint16_t port)
10876 {
10877         /* formulate and SEND a SHUTDOWN-COMPLETE */
10878         struct mbuf *o_pak;
10879         struct mbuf *mout;
10880         struct ip *iph;
10881         struct udphdr *udp = NULL;
10882         int offset_out, len, mlen;
10883         struct sctp_shutdown_complete_msg *comp_cp;
10884
10885 #ifdef INET
10886         struct ip *iph_out;
10887
10888 #endif
10889 #ifdef INET6
10890         struct ip6_hdr *ip6, *ip6_out;
10891
10892 #endif
10893
10894         iph = mtod(m, struct ip *);
10895         switch (iph->ip_v) {
10896 #ifdef INET
10897         case IPVERSION:
10898                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10899                 break;
10900 #endif
10901 #ifdef INET6
10902         case IPV6_VERSION >> 4:
10903                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10904                 break;
10905 #endif
10906         default:
10907                 return;
10908         }
10909         if (port) {
10910                 len += sizeof(struct udphdr);
10911         }
10912         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10913         if (mout == NULL) {
10914                 return;
10915         }
10916         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10917         SCTP_BUF_LEN(mout) = len;
10918         SCTP_BUF_NEXT(mout) = NULL;
10919         if (m->m_flags & M_FLOWID) {
10920                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10921                 mout->m_flags |= M_FLOWID;
10922         }
10923 #ifdef INET
10924         iph_out = NULL;
10925 #endif
10926 #ifdef INET6
10927         ip6_out = NULL;
10928 #endif
10929         offset_out = 0;
10930
10931         switch (iph->ip_v) {
10932 #ifdef INET
10933         case IPVERSION:
10934                 iph_out = mtod(mout, struct ip *);
10935
10936                 /* Fill in the IP header for the ABORT */
10937                 iph_out->ip_v = IPVERSION;
10938                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10939                 iph_out->ip_tos = (u_char)0;
10940                 iph_out->ip_id = 0;
10941                 iph_out->ip_off = 0;
10942                 iph_out->ip_ttl = MAXTTL;
10943                 if (port) {
10944                         iph_out->ip_p = IPPROTO_UDP;
10945                 } else {
10946                         iph_out->ip_p = IPPROTO_SCTP;
10947                 }
10948                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10949                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10950
10951                 /* let IP layer calculate this */
10952                 iph_out->ip_sum = 0;
10953                 offset_out += sizeof(*iph_out);
10954                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10955                     (caddr_t)iph_out + offset_out);
10956                 break;
10957 #endif
10958 #ifdef INET6
10959         case IPV6_VERSION >> 4:
10960                 ip6 = (struct ip6_hdr *)iph;
10961                 ip6_out = mtod(mout, struct ip6_hdr *);
10962
10963                 /* Fill in the IPv6 header for the ABORT */
10964                 ip6_out->ip6_flow = ip6->ip6_flow;
10965                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10966                 if (port) {
10967                         ip6_out->ip6_nxt = IPPROTO_UDP;
10968                 } else {
10969                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10970                 }
10971                 ip6_out->ip6_src = ip6->ip6_dst;
10972                 ip6_out->ip6_dst = ip6->ip6_src;
10973                 /*
10974                  * ?? The old code had both the iph len + payload, I think
10975                  * this is wrong and would never have worked
10976                  */
10977                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10978                 offset_out += sizeof(*ip6_out);
10979                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10980                     (caddr_t)ip6_out + offset_out);
10981                 break;
10982 #endif                          /* INET6 */
10983         default:
10984                 /* Currently not supported. */
10985                 sctp_m_freem(mout);
10986                 return;
10987         }
10988         if (port) {
10989                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10990                         sctp_m_freem(mout);
10991                         return;
10992                 }
10993                 udp = (struct udphdr *)comp_cp;
10994                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10995                 udp->uh_dport = port;
10996                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10997 #ifdef INET
10998                 if (iph_out) {
10999                         if (V_udp_cksum) {
11000                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11001                         } else {
11002                                 udp->uh_sum = 0;
11003                         }
11004                 }
11005 #endif
11006                 offset_out += sizeof(struct udphdr);
11007                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
11008         }
11009         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11010                 /* no mbuf's */
11011                 sctp_m_freem(mout);
11012                 return;
11013         }
11014         /* Now copy in and fill in the ABORT tags etc. */
11015         comp_cp->sh.src_port = sh->dest_port;
11016         comp_cp->sh.dest_port = sh->src_port;
11017         comp_cp->sh.checksum = 0;
11018         comp_cp->sh.v_tag = sh->v_tag;
11019         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
11020         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11021         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11022
11023 #ifdef INET
11024         if (iph_out != NULL) {
11025                 sctp_route_t ro;
11026                 int ret;
11027
11028                 mlen = SCTP_BUF_LEN(mout);
11029                 bzero(&ro, sizeof ro);
11030                 /* set IPv4 length */
11031                 iph_out->ip_len = mlen;
11032 #ifdef  SCTP_PACKET_LOGGING
11033                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11034                         sctp_packet_log(mout, mlen);
11035 #endif
11036                 if (port) {
11037 #if defined(SCTP_WITH_NO_CSUM)
11038                         SCTP_STAT_INCR(sctps_sendnocrc);
11039 #else
11040                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
11041                         SCTP_STAT_INCR(sctps_sendswcrc);
11042 #endif
11043                         if (V_udp_cksum) {
11044                                 SCTP_ENABLE_UDP_CSUM(mout);
11045                         }
11046                 } else {
11047 #if defined(SCTP_WITH_NO_CSUM)
11048                         SCTP_STAT_INCR(sctps_sendnocrc);
11049 #else
11050                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11051                         mout->m_pkthdr.csum_data = 0;
11052                         SCTP_STAT_INCR(sctps_sendhwcrc);
11053 #endif
11054                 }
11055                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11056                 /* out it goes */
11057                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11058
11059                 /* Free the route if we got one back */
11060                 if (ro.ro_rt)
11061                         RTFREE(ro.ro_rt);
11062         }
11063 #endif
11064 #ifdef INET6
11065         if (ip6_out != NULL) {
11066                 struct route_in6 ro;
11067                 int ret;
11068                 struct ifnet *ifp = NULL;
11069
11070                 bzero(&ro, sizeof(ro));
11071                 mlen = SCTP_BUF_LEN(mout);
11072 #ifdef  SCTP_PACKET_LOGGING
11073                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11074                         sctp_packet_log(mout, mlen);
11075 #endif
11076                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11077                 if (port) {
11078 #if defined(SCTP_WITH_NO_CSUM)
11079                         SCTP_STAT_INCR(sctps_sendnocrc);
11080 #else
11081                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11082                         SCTP_STAT_INCR(sctps_sendswcrc);
11083 #endif
11084                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
11085                                 udp->uh_sum = 0xffff;
11086                         }
11087                 } else {
11088 #if defined(SCTP_WITH_NO_CSUM)
11089                         SCTP_STAT_INCR(sctps_sendnocrc);
11090 #else
11091                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11092                         mout->m_pkthdr.csum_data = 0;
11093                         SCTP_STAT_INCR(sctps_sendhwcrc);
11094 #endif
11095                 }
11096                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11097
11098                 /* Free the route if we got one back */
11099                 if (ro.ro_rt)
11100                         RTFREE(ro.ro_rt);
11101         }
11102 #endif
11103         SCTP_STAT_INCR(sctps_sendpackets);
11104         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11105         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11106         return;
11107
11108 }
11109
11110 void
11111 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11112 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11113     SCTP_UNUSED
11114 #endif
11115 )
11116 {
11117         struct sctp_tmit_chunk *chk;
11118         struct sctp_heartbeat_chunk *hb;
11119         struct timeval now;
11120
11121         SCTP_TCB_LOCK_ASSERT(stcb);
11122         if (net == NULL) {
11123                 return;
11124         }
11125         (void)SCTP_GETTIME_TIMEVAL(&now);
11126         switch (net->ro._l_addr.sa.sa_family) {
11127 #ifdef INET
11128         case AF_INET:
11129                 break;
11130 #endif
11131 #ifdef INET6
11132         case AF_INET6:
11133                 break;
11134 #endif
11135         default:
11136                 return;
11137         }
11138         sctp_alloc_a_chunk(stcb, chk);
11139         if (chk == NULL) {
11140                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11141                 return;
11142         }
11143         chk->copy_by_ref = 0;
11144         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11145         chk->rec.chunk_id.can_take_data = 1;
11146         chk->asoc = &stcb->asoc;
11147         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11148
11149         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11150         if (chk->data == NULL) {
11151                 sctp_free_a_chunk(stcb, chk, so_locked);
11152                 return;
11153         }
11154         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11155         SCTP_BUF_LEN(chk->data) = chk->send_size;
11156         chk->sent = SCTP_DATAGRAM_UNSENT;
11157         chk->snd_count = 0;
11158         chk->whoTo = net;
11159         atomic_add_int(&chk->whoTo->ref_count, 1);
11160         /* Now we have a mbuf that we can fill in with the details */
11161         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11162         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11163         /* fill out chunk header */
11164         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11165         hb->ch.chunk_flags = 0;
11166         hb->ch.chunk_length = htons(chk->send_size);
11167         /* Fill out hb parameter */
11168         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11169         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11170         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11171         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11172         /* Did our user request this one, put it in */
11173         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11174         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11175         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11176                 /*
11177                  * we only take from the entropy pool if the address is not
11178                  * confirmed.
11179                  */
11180                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11181                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11182         } else {
11183                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11184                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11185         }
11186         switch (net->ro._l_addr.sa.sa_family) {
11187 #ifdef INET
11188         case AF_INET:
11189                 memcpy(hb->heartbeat.hb_info.address,
11190                     &net->ro._l_addr.sin.sin_addr,
11191                     sizeof(net->ro._l_addr.sin.sin_addr));
11192                 break;
11193 #endif
11194 #ifdef INET6
11195         case AF_INET6:
11196                 memcpy(hb->heartbeat.hb_info.address,
11197                     &net->ro._l_addr.sin6.sin6_addr,
11198                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11199                 break;
11200 #endif
11201         default:
11202                 return;
11203                 break;
11204         }
11205         net->hb_responded = 0;
11206         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11207         stcb->asoc.ctrl_queue_cnt++;
11208         SCTP_STAT_INCR(sctps_sendheartbeat);
11209         return;
11210 }
11211
11212 void
11213 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11214     uint32_t high_tsn)
11215 {
11216         struct sctp_association *asoc;
11217         struct sctp_ecne_chunk *ecne;
11218         struct sctp_tmit_chunk *chk;
11219
11220         if (net == NULL) {
11221                 return;
11222         }
11223         asoc = &stcb->asoc;
11224         SCTP_TCB_LOCK_ASSERT(stcb);
11225         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11226                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11227                         /* found a previous ECN_ECHO update it if needed */
11228                         uint32_t cnt, ctsn;
11229
11230                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11231                         ctsn = ntohl(ecne->tsn);
11232                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11233                                 ecne->tsn = htonl(high_tsn);
11234                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11235                         }
11236                         cnt = ntohl(ecne->num_pkts_since_cwr);
11237                         cnt++;
11238                         ecne->num_pkts_since_cwr = htonl(cnt);
11239                         return;
11240                 }
11241         }
11242         /* nope could not find one to update so we must build one */
11243         sctp_alloc_a_chunk(stcb, chk);
11244         if (chk == NULL) {
11245                 return;
11246         }
11247         chk->copy_by_ref = 0;
11248         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11249         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11250         chk->rec.chunk_id.can_take_data = 0;
11251         chk->asoc = &stcb->asoc;
11252         chk->send_size = sizeof(struct sctp_ecne_chunk);
11253         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11254         if (chk->data == NULL) {
11255                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11256                 return;
11257         }
11258         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11259         SCTP_BUF_LEN(chk->data) = chk->send_size;
11260         chk->sent = SCTP_DATAGRAM_UNSENT;
11261         chk->snd_count = 0;
11262         chk->whoTo = net;
11263         atomic_add_int(&chk->whoTo->ref_count, 1);
11264
11265         stcb->asoc.ecn_echo_cnt_onq++;
11266         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11267         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11268         ecne->ch.chunk_flags = 0;
11269         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11270         ecne->tsn = htonl(high_tsn);
11271         ecne->num_pkts_since_cwr = htonl(1);
11272         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11273         asoc->ctrl_queue_cnt++;
11274 }
11275
11276 void
11277 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11278     struct mbuf *m, int iphlen, int bad_crc)
11279 {
11280         struct sctp_association *asoc;
11281         struct sctp_pktdrop_chunk *drp;
11282         struct sctp_tmit_chunk *chk;
11283         uint8_t *datap;
11284         int len;
11285         int was_trunc = 0;
11286         struct ip *iph;
11287
11288 #ifdef INET6
11289         struct ip6_hdr *ip6h;
11290
11291 #endif
11292         int fullsz = 0, extra = 0;
11293         long spc;
11294         int offset;
11295         struct sctp_chunkhdr *ch, chunk_buf;
11296         unsigned int chk_length;
11297
11298         if (!stcb) {
11299                 return;
11300         }
11301         asoc = &stcb->asoc;
11302         SCTP_TCB_LOCK_ASSERT(stcb);
11303         if (asoc->peer_supports_pktdrop == 0) {
11304                 /*-
11305                  * peer must declare support before I send one.
11306                  */
11307                 return;
11308         }
11309         if (stcb->sctp_socket == NULL) {
11310                 return;
11311         }
11312         sctp_alloc_a_chunk(stcb, chk);
11313         if (chk == NULL) {
11314                 return;
11315         }
11316         chk->copy_by_ref = 0;
11317         iph = mtod(m, struct ip *);
11318         if (iph == NULL) {
11319                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11320                 return;
11321         }
11322         switch (iph->ip_v) {
11323 #ifdef INET
11324         case IPVERSION:
11325                 /* IPv4 */
11326                 len = chk->send_size = iph->ip_len;
11327                 break;
11328 #endif
11329 #ifdef INET6
11330         case IPV6_VERSION >> 4:
11331                 /* IPv6 */
11332                 ip6h = mtod(m, struct ip6_hdr *);
11333                 len = chk->send_size = htons(ip6h->ip6_plen);
11334                 break;
11335 #endif
11336         default:
11337                 return;
11338         }
11339         /* Validate that we do not have an ABORT in here. */
11340         offset = iphlen + sizeof(struct sctphdr);
11341         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11342             sizeof(*ch), (uint8_t *) & chunk_buf);
11343         while (ch != NULL) {
11344                 chk_length = ntohs(ch->chunk_length);
11345                 if (chk_length < sizeof(*ch)) {
11346                         /* break to abort land */
11347                         break;
11348                 }
11349                 switch (ch->chunk_type) {
11350                 case SCTP_PACKET_DROPPED:
11351                 case SCTP_ABORT_ASSOCIATION:
11352                 case SCTP_INITIATION_ACK:
11353                         /**
11354                          * We don't respond with an PKT-DROP to an ABORT
11355                          * or PKT-DROP. We also do not respond to an
11356                          * INIT-ACK, because we can't know if the initiation
11357                          * tag is correct or not.
11358                          */
11359                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11360                         return;
11361                 default:
11362                         break;
11363                 }
11364                 offset += SCTP_SIZE32(chk_length);
11365                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11366                     sizeof(*ch), (uint8_t *) & chunk_buf);
11367         }
11368
11369         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11370             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11371                 /*
11372                  * only send 1 mtu worth, trim off the excess on the end.
11373                  */
11374                 fullsz = len - extra;
11375                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11376                 was_trunc = 1;
11377         }
11378         chk->asoc = &stcb->asoc;
11379         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11380         if (chk->data == NULL) {
11381 jump_out:
11382                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11383                 return;
11384         }
11385         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11386         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11387         if (drp == NULL) {
11388                 sctp_m_freem(chk->data);
11389                 chk->data = NULL;
11390                 goto jump_out;
11391         }
11392         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11393             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11394         chk->book_size_scale = 0;
11395         if (was_trunc) {
11396                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11397                 drp->trunc_len = htons(fullsz);
11398                 /*
11399                  * Len is already adjusted to size minus overhead above take
11400                  * out the pkt_drop chunk itself from it.
11401                  */
11402                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11403                 len = chk->send_size;
11404         } else {
11405                 /* no truncation needed */
11406                 drp->ch.chunk_flags = 0;
11407                 drp->trunc_len = htons(0);
11408         }
11409         if (bad_crc) {
11410                 drp->ch.chunk_flags |= SCTP_BADCRC;
11411         }
11412         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11413         SCTP_BUF_LEN(chk->data) = chk->send_size;
11414         chk->sent = SCTP_DATAGRAM_UNSENT;
11415         chk->snd_count = 0;
11416         if (net) {
11417                 /* we should hit here */
11418                 chk->whoTo = net;
11419                 atomic_add_int(&chk->whoTo->ref_count, 1);
11420         } else {
11421                 chk->whoTo = NULL;
11422         }
11423         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11424         chk->rec.chunk_id.can_take_data = 1;
11425         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11426         drp->ch.chunk_length = htons(chk->send_size);
11427         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11428         if (spc < 0) {
11429                 spc = 0;
11430         }
11431         drp->bottle_bw = htonl(spc);
11432         if (asoc->my_rwnd) {
11433                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11434                     asoc->size_on_all_streams +
11435                     asoc->my_rwnd_control_len +
11436                     stcb->sctp_socket->so_rcv.sb_cc);
11437         } else {
11438                 /*-
11439                  * If my rwnd is 0, possibly from mbuf depletion as well as
11440                  * space used, tell the peer there is NO space aka onq == bw
11441                  */
11442                 drp->current_onq = htonl(spc);
11443         }
11444         drp->reserved = 0;
11445         datap = drp->data;
11446         m_copydata(m, iphlen, len, (caddr_t)datap);
11447         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11448         asoc->ctrl_queue_cnt++;
11449 }
11450
11451 void
11452 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11453 {
11454         struct sctp_association *asoc;
11455         struct sctp_cwr_chunk *cwr;
11456         struct sctp_tmit_chunk *chk;
11457
11458         asoc = &stcb->asoc;
11459         SCTP_TCB_LOCK_ASSERT(stcb);
11460         if (net == NULL) {
11461                 return;
11462         }
11463         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11464                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11465                         /*
11466                          * found a previous CWR queued to same destination
11467                          * update it if needed
11468                          */
11469                         uint32_t ctsn;
11470
11471                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11472                         ctsn = ntohl(cwr->tsn);
11473                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11474                                 cwr->tsn = htonl(high_tsn);
11475                         }
11476                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11477                                 /* Make sure override is carried */
11478                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11479                         }
11480                         return;
11481                 }
11482         }
11483         sctp_alloc_a_chunk(stcb, chk);
11484         if (chk == NULL) {
11485                 return;
11486         }
11487         chk->copy_by_ref = 0;
11488         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11489         chk->rec.chunk_id.can_take_data = 1;
11490         chk->asoc = &stcb->asoc;
11491         chk->send_size = sizeof(struct sctp_cwr_chunk);
11492         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11493         if (chk->data == NULL) {
11494                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11495                 return;
11496         }
11497         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11498         SCTP_BUF_LEN(chk->data) = chk->send_size;
11499         chk->sent = SCTP_DATAGRAM_UNSENT;
11500         chk->snd_count = 0;
11501         chk->whoTo = net;
11502         atomic_add_int(&chk->whoTo->ref_count, 1);
11503         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11504         cwr->ch.chunk_type = SCTP_ECN_CWR;
11505         cwr->ch.chunk_flags = override;
11506         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11507         cwr->tsn = htonl(high_tsn);
11508         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11509         asoc->ctrl_queue_cnt++;
11510 }
11511
11512 void
11513 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11514     int number_entries, uint16_t * list,
11515     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11516 {
11517         int len, old_len, i;
11518         struct sctp_stream_reset_out_request *req_out;
11519         struct sctp_chunkhdr *ch;
11520
11521         ch = mtod(chk->data, struct sctp_chunkhdr *);
11522
11523
11524         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11525
11526         /* get to new offset for the param. */
11527         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11528         /* now how long will this param be? */
11529         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11530         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11531         req_out->ph.param_length = htons(len);
11532         req_out->request_seq = htonl(seq);
11533         req_out->response_seq = htonl(resp_seq);
11534         req_out->send_reset_at_tsn = htonl(last_sent);
11535         if (number_entries) {
11536                 for (i = 0; i < number_entries; i++) {
11537                         req_out->list_of_streams[i] = htons(list[i]);
11538                 }
11539         }
11540         if (SCTP_SIZE32(len) > len) {
11541                 /*-
11542                  * Need to worry about the pad we may end up adding to the
11543                  * end. This is easy since the struct is either aligned to 4
11544                  * bytes or 2 bytes off.
11545                  */
11546                 req_out->list_of_streams[number_entries] = 0;
11547         }
11548         /* now fix the chunk length */
11549         ch->chunk_length = htons(len + old_len);
11550         chk->book_size = len + old_len;
11551         chk->book_size_scale = 0;
11552         chk->send_size = SCTP_SIZE32(chk->book_size);
11553         SCTP_BUF_LEN(chk->data) = chk->send_size;
11554         return;
11555 }
11556
11557
11558 void
11559 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11560     int number_entries, uint16_t * list,
11561     uint32_t seq)
11562 {
11563         int len, old_len, i;
11564         struct sctp_stream_reset_in_request *req_in;
11565         struct sctp_chunkhdr *ch;
11566
11567         ch = mtod(chk->data, struct sctp_chunkhdr *);
11568
11569
11570         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11571
11572         /* get to new offset for the param. */
11573         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11574         /* now how long will this param be? */
11575         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11576         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11577         req_in->ph.param_length = htons(len);
11578         req_in->request_seq = htonl(seq);
11579         if (number_entries) {
11580                 for (i = 0; i < number_entries; i++) {
11581                         req_in->list_of_streams[i] = htons(list[i]);
11582                 }
11583         }
11584         if (SCTP_SIZE32(len) > len) {
11585                 /*-
11586                  * Need to worry about the pad we may end up adding to the
11587                  * end. This is easy since the struct is either aligned to 4
11588                  * bytes or 2 bytes off.
11589                  */
11590                 req_in->list_of_streams[number_entries] = 0;
11591         }
11592         /* now fix the chunk length */
11593         ch->chunk_length = htons(len + old_len);
11594         chk->book_size = len + old_len;
11595         chk->book_size_scale = 0;
11596         chk->send_size = SCTP_SIZE32(chk->book_size);
11597         SCTP_BUF_LEN(chk->data) = chk->send_size;
11598         return;
11599 }
11600
11601
11602 void
11603 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11604     uint32_t seq)
11605 {
11606         int len, old_len;
11607         struct sctp_stream_reset_tsn_request *req_tsn;
11608         struct sctp_chunkhdr *ch;
11609
11610         ch = mtod(chk->data, struct sctp_chunkhdr *);
11611
11612
11613         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11614
11615         /* get to new offset for the param. */
11616         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11617         /* now how long will this param be? */
11618         len = sizeof(struct sctp_stream_reset_tsn_request);
11619         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11620         req_tsn->ph.param_length = htons(len);
11621         req_tsn->request_seq = htonl(seq);
11622
11623         /* now fix the chunk length */
11624         ch->chunk_length = htons(len + old_len);
11625         chk->send_size = len + old_len;
11626         chk->book_size = SCTP_SIZE32(chk->send_size);
11627         chk->book_size_scale = 0;
11628         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11629         return;
11630 }
11631
11632 void
11633 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11634     uint32_t resp_seq, uint32_t result)
11635 {
11636         int len, old_len;
11637         struct sctp_stream_reset_response *resp;
11638         struct sctp_chunkhdr *ch;
11639
11640         ch = mtod(chk->data, struct sctp_chunkhdr *);
11641
11642
11643         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11644
11645         /* get to new offset for the param. */
11646         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11647         /* now how long will this param be? */
11648         len = sizeof(struct sctp_stream_reset_response);
11649         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11650         resp->ph.param_length = htons(len);
11651         resp->response_seq = htonl(resp_seq);
11652         resp->result = ntohl(result);
11653
11654         /* now fix the chunk length */
11655         ch->chunk_length = htons(len + old_len);
11656         chk->book_size = len + old_len;
11657         chk->book_size_scale = 0;
11658         chk->send_size = SCTP_SIZE32(chk->book_size);
11659         SCTP_BUF_LEN(chk->data) = chk->send_size;
11660         return;
11661
11662 }
11663
11664
11665 void
11666 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11667     uint32_t resp_seq, uint32_t result,
11668     uint32_t send_una, uint32_t recv_next)
11669 {
11670         int len, old_len;
11671         struct sctp_stream_reset_response_tsn *resp;
11672         struct sctp_chunkhdr *ch;
11673
11674         ch = mtod(chk->data, struct sctp_chunkhdr *);
11675
11676
11677         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11678
11679         /* get to new offset for the param. */
11680         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11681         /* now how long will this param be? */
11682         len = sizeof(struct sctp_stream_reset_response_tsn);
11683         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11684         resp->ph.param_length = htons(len);
11685         resp->response_seq = htonl(resp_seq);
11686         resp->result = htonl(result);
11687         resp->senders_next_tsn = htonl(send_una);
11688         resp->receivers_next_tsn = htonl(recv_next);
11689
11690         /* now fix the chunk length */
11691         ch->chunk_length = htons(len + old_len);
11692         chk->book_size = len + old_len;
11693         chk->send_size = SCTP_SIZE32(chk->book_size);
11694         chk->book_size_scale = 0;
11695         SCTP_BUF_LEN(chk->data) = chk->send_size;
11696         return;
11697 }
11698
11699 static void
11700 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11701     uint32_t seq,
11702     uint16_t adding)
11703 {
11704         int len, old_len;
11705         struct sctp_chunkhdr *ch;
11706         struct sctp_stream_reset_add_strm *addstr;
11707
11708         ch = mtod(chk->data, struct sctp_chunkhdr *);
11709         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11710
11711         /* get to new offset for the param. */
11712         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11713         /* now how long will this param be? */
11714         len = sizeof(struct sctp_stream_reset_add_strm);
11715
11716         /* Fill it out. */
11717         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11718         addstr->ph.param_length = htons(len);
11719         addstr->request_seq = htonl(seq);
11720         addstr->number_of_streams = htons(adding);
11721         addstr->reserved = 0;
11722
11723         /* now fix the chunk length */
11724         ch->chunk_length = htons(len + old_len);
11725         chk->send_size = len + old_len;
11726         chk->book_size = SCTP_SIZE32(chk->send_size);
11727         chk->book_size_scale = 0;
11728         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11729         return;
11730 }
11731
11732 static void
11733 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11734     uint32_t seq,
11735     uint16_t adding)
11736 {
11737         int len, old_len;
11738         struct sctp_chunkhdr *ch;
11739         struct sctp_stream_reset_add_strm *addstr;
11740
11741         ch = mtod(chk->data, struct sctp_chunkhdr *);
11742         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11743
11744         /* get to new offset for the param. */
11745         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11746         /* now how long will this param be? */
11747         len = sizeof(struct sctp_stream_reset_add_strm);
11748         /* Fill it out. */
11749         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11750         addstr->ph.param_length = htons(len);
11751         addstr->request_seq = htonl(seq);
11752         addstr->number_of_streams = htons(adding);
11753         addstr->reserved = 0;
11754
11755         /* now fix the chunk length */
11756         ch->chunk_length = htons(len + old_len);
11757         chk->send_size = len + old_len;
11758         chk->book_size = SCTP_SIZE32(chk->send_size);
11759         chk->book_size_scale = 0;
11760         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11761         return;
11762 }
11763
11764
11765
11766 int
11767 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11768     int number_entries, uint16_t * list,
11769     uint8_t send_out_req,
11770     uint8_t send_in_req,
11771     uint8_t send_tsn_req,
11772     uint8_t add_stream,
11773     uint16_t adding_o,
11774     uint16_t adding_i, uint8_t peer_asked
11775 )
11776 {
11777
11778         struct sctp_association *asoc;
11779         struct sctp_tmit_chunk *chk;
11780         struct sctp_chunkhdr *ch;
11781         uint32_t seq;
11782
11783         asoc = &stcb->asoc;
11784         if (asoc->stream_reset_outstanding) {
11785                 /*-
11786                  * Already one pending, must get ACK back to clear the flag.
11787                  */
11788                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11789                 return (EBUSY);
11790         }
11791         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11792             (add_stream == 0)) {
11793                 /* nothing to do */
11794                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11795                 return (EINVAL);
11796         }
11797         if (send_tsn_req && (send_out_req || send_in_req)) {
11798                 /* error, can't do that */
11799                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11800                 return (EINVAL);
11801         }
11802         sctp_alloc_a_chunk(stcb, chk);
11803         if (chk == NULL) {
11804                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11805                 return (ENOMEM);
11806         }
11807         chk->copy_by_ref = 0;
11808         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11809         chk->rec.chunk_id.can_take_data = 0;
11810         chk->asoc = &stcb->asoc;
11811         chk->book_size = sizeof(struct sctp_chunkhdr);
11812         chk->send_size = SCTP_SIZE32(chk->book_size);
11813         chk->book_size_scale = 0;
11814
11815         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11816         if (chk->data == NULL) {
11817                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11818                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11819                 return (ENOMEM);
11820         }
11821         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11822
11823         /* setup chunk parameters */
11824         chk->sent = SCTP_DATAGRAM_UNSENT;
11825         chk->snd_count = 0;
11826         if (stcb->asoc.alternate) {
11827                 chk->whoTo = stcb->asoc.alternate;
11828         } else {
11829                 chk->whoTo = stcb->asoc.primary_destination;
11830         }
11831         atomic_add_int(&chk->whoTo->ref_count, 1);
11832         ch = mtod(chk->data, struct sctp_chunkhdr *);
11833         ch->chunk_type = SCTP_STREAM_RESET;
11834         ch->chunk_flags = 0;
11835         ch->chunk_length = htons(chk->book_size);
11836         SCTP_BUF_LEN(chk->data) = chk->send_size;
11837
11838         seq = stcb->asoc.str_reset_seq_out;
11839         if (send_out_req) {
11840                 sctp_add_stream_reset_out(chk, number_entries, list,
11841                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11842                 asoc->stream_reset_out_is_outstanding = 1;
11843                 seq++;
11844                 asoc->stream_reset_outstanding++;
11845         }
11846         if ((add_stream & 1) &&
11847             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11848                 /* Need to allocate more */
11849                 struct sctp_stream_out *oldstream;
11850                 struct sctp_stream_queue_pending *sp, *nsp;
11851                 int i;
11852
11853                 oldstream = stcb->asoc.strmout;
11854                 /* get some more */
11855                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11856                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11857                     SCTP_M_STRMO);
11858                 if (stcb->asoc.strmout == NULL) {
11859                         uint8_t x;
11860
11861                         stcb->asoc.strmout = oldstream;
11862                         /* Turn off the bit */
11863                         x = add_stream & 0xfe;
11864                         add_stream = x;
11865                         goto skip_stuff;
11866                 }
11867                 /*
11868                  * Ok now we proceed with copying the old out stuff and
11869                  * initializing the new stuff.
11870                  */
11871                 SCTP_TCB_SEND_LOCK(stcb);
11872                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11873                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11874                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11875                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11876                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11877                         stcb->asoc.strmout[i].stream_no = i;
11878                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11879                         /* now anything on those queues? */
11880                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11881                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11882                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11883                         }
11884                         /* Now move assoc pointers too */
11885                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11886                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11887                         }
11888                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11889                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11890                         }
11891                 }
11892                 /* now the new streams */
11893                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11894                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11895                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11896                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11897                         stcb->asoc.strmout[i].stream_no = i;
11898                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11899                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11900                 }
11901                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11902                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11903                 SCTP_TCB_SEND_UNLOCK(stcb);
11904         }
11905 skip_stuff:
11906         if ((add_stream & 1) && (adding_o > 0)) {
11907                 asoc->strm_pending_add_size = adding_o;
11908                 asoc->peer_req_out = peer_asked;
11909                 sctp_add_an_out_stream(chk, seq, adding_o);
11910                 seq++;
11911                 asoc->stream_reset_outstanding++;
11912         }
11913         if ((add_stream & 2) && (adding_i > 0)) {
11914                 sctp_add_an_in_stream(chk, seq, adding_i);
11915                 seq++;
11916                 asoc->stream_reset_outstanding++;
11917         }
11918         if (send_in_req) {
11919                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11920                 seq++;
11921                 asoc->stream_reset_outstanding++;
11922         }
11923         if (send_tsn_req) {
11924                 sctp_add_stream_reset_tsn(chk, seq);
11925                 asoc->stream_reset_outstanding++;
11926         }
11927         asoc->str_reset = chk;
11928         /* insert the chunk for sending */
11929         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11930             chk,
11931             sctp_next);
11932         asoc->ctrl_queue_cnt++;
11933         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11934         return (0);
11935 }
11936
11937 void
11938 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11939     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11940 {
11941         /*-
11942          * Formulate the abort message, and send it back down.
11943          */
11944         struct mbuf *o_pak;
11945         struct mbuf *mout;
11946         struct sctp_abort_msg *abm;
11947         struct ip *iph;
11948         struct udphdr *udp;
11949         int iphlen_out, len;
11950
11951 #ifdef INET
11952         struct ip *iph_out;
11953
11954 #endif
11955 #ifdef INET6
11956         struct ip6_hdr *ip6, *ip6_out;
11957
11958 #endif
11959
11960         /* don't respond to ABORT with ABORT */
11961         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11962                 if (err_cause)
11963                         sctp_m_freem(err_cause);
11964                 return;
11965         }
11966         iph = mtod(m, struct ip *);
11967         switch (iph->ip_v) {
11968 #ifdef INET
11969         case IPVERSION:
11970                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11971                 break;
11972 #endif
11973 #ifdef INET6
11974         case IPV6_VERSION >> 4:
11975                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11976                 break;
11977 #endif
11978         default:
11979                 if (err_cause) {
11980                         sctp_m_freem(err_cause);
11981                 }
11982                 return;
11983         }
11984         if (port) {
11985                 len += sizeof(struct udphdr);
11986         }
11987         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11988         if (mout == NULL) {
11989                 if (err_cause) {
11990                         sctp_m_freem(err_cause);
11991                 }
11992                 return;
11993         }
11994         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11995         SCTP_BUF_LEN(mout) = len;
11996         SCTP_BUF_NEXT(mout) = err_cause;
11997         if (m->m_flags & M_FLOWID) {
11998                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11999                 mout->m_flags |= M_FLOWID;
12000         }
12001 #ifdef INET
12002         iph_out = NULL;
12003 #endif
12004 #ifdef INET6
12005         ip6_out = NULL;
12006 #endif
12007         switch (iph->ip_v) {
12008 #ifdef INET
12009         case IPVERSION:
12010                 iph_out = mtod(mout, struct ip *);
12011
12012                 /* Fill in the IP header for the ABORT */
12013                 iph_out->ip_v = IPVERSION;
12014                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12015                 iph_out->ip_tos = (u_char)0;
12016                 iph_out->ip_id = 0;
12017                 iph_out->ip_off = 0;
12018                 iph_out->ip_ttl = MAXTTL;
12019                 if (port) {
12020                         iph_out->ip_p = IPPROTO_UDP;
12021                 } else {
12022                         iph_out->ip_p = IPPROTO_SCTP;
12023                 }
12024                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12025                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12026                 /* let IP layer calculate this */
12027                 iph_out->ip_sum = 0;
12028
12029                 iphlen_out = sizeof(*iph_out);
12030                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
12031                 break;
12032 #endif
12033 #ifdef INET6
12034         case IPV6_VERSION >> 4:
12035                 ip6 = (struct ip6_hdr *)iph;
12036                 ip6_out = mtod(mout, struct ip6_hdr *);
12037
12038                 /* Fill in the IP6 header for the ABORT */
12039                 ip6_out->ip6_flow = ip6->ip6_flow;
12040                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12041                 if (port) {
12042                         ip6_out->ip6_nxt = IPPROTO_UDP;
12043                 } else {
12044                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12045                 }
12046                 ip6_out->ip6_src = ip6->ip6_dst;
12047                 ip6_out->ip6_dst = ip6->ip6_src;
12048
12049                 iphlen_out = sizeof(*ip6_out);
12050                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
12051                 break;
12052 #endif                          /* INET6 */
12053         default:
12054                 /* Currently not supported */
12055                 sctp_m_freem(mout);
12056                 return;
12057         }
12058
12059         udp = (struct udphdr *)abm;
12060         if (port) {
12061                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12062                         sctp_m_freem(mout);
12063                         return;
12064                 }
12065                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12066                 udp->uh_dport = port;
12067                 /* set udp->uh_ulen later */
12068                 udp->uh_sum = 0;
12069                 iphlen_out += sizeof(struct udphdr);
12070                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
12071         }
12072         abm->sh.src_port = sh->dest_port;
12073         abm->sh.dest_port = sh->src_port;
12074         abm->sh.checksum = 0;
12075         if (vtag == 0) {
12076                 abm->sh.v_tag = sh->v_tag;
12077                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
12078         } else {
12079                 abm->sh.v_tag = htonl(vtag);
12080                 abm->msg.ch.chunk_flags = 0;
12081         }
12082         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
12083
12084         if (err_cause) {
12085                 struct mbuf *m_tmp = err_cause;
12086                 int err_len = 0;
12087
12088                 /* get length of the err_cause chain */
12089                 while (m_tmp != NULL) {
12090                         err_len += SCTP_BUF_LEN(m_tmp);
12091                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12092                 }
12093                 len = SCTP_BUF_LEN(mout) + err_len;
12094                 if (err_len % 4) {
12095                         /* need pad at end of chunk */
12096                         uint32_t cpthis = 0;
12097                         int padlen;
12098
12099                         padlen = 4 - (len % 4);
12100                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12101                         len += padlen;
12102                 }
12103                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
12104         } else {
12105                 len = SCTP_BUF_LEN(mout);
12106                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
12107         }
12108
12109         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12110                 /* no mbuf's */
12111                 sctp_m_freem(mout);
12112                 return;
12113         }
12114 #ifdef INET
12115         if (iph_out != NULL) {
12116                 sctp_route_t ro;
12117                 int ret;
12118
12119                 /* zap the stack pointer to the route */
12120                 bzero(&ro, sizeof ro);
12121                 if (port) {
12122                         udp->uh_ulen = htons(len - sizeof(struct ip));
12123                         if (V_udp_cksum) {
12124                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12125                         } else {
12126                                 udp->uh_sum = 0;
12127                         }
12128                 }
12129                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
12130                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
12131                 /* set IPv4 length */
12132                 iph_out->ip_len = len;
12133                 /* out it goes */
12134 #ifdef  SCTP_PACKET_LOGGING
12135                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12136                         sctp_packet_log(mout, len);
12137 #endif
12138                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12139                 if (port) {
12140 #if defined(SCTP_WITH_NO_CSUM)
12141                         SCTP_STAT_INCR(sctps_sendnocrc);
12142 #else
12143                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
12144                         SCTP_STAT_INCR(sctps_sendswcrc);
12145 #endif
12146                         if (V_udp_cksum) {
12147                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12148                         }
12149                 } else {
12150 #if defined(SCTP_WITH_NO_CSUM)
12151                         SCTP_STAT_INCR(sctps_sendnocrc);
12152 #else
12153                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12154                         mout->m_pkthdr.csum_data = 0;
12155                         SCTP_STAT_INCR(sctps_sendhwcrc);
12156 #endif
12157                 }
12158                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12159
12160                 /* Free the route if we got one back */
12161                 if (ro.ro_rt)
12162                         RTFREE(ro.ro_rt);
12163         }
12164 #endif
12165 #ifdef INET6
12166         if (ip6_out != NULL) {
12167                 struct route_in6 ro;
12168                 int ret;
12169                 struct ifnet *ifp = NULL;
12170
12171                 /* zap the stack pointer to the route */
12172                 bzero(&ro, sizeof(ro));
12173                 if (port) {
12174                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12175                 }
12176                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
12177                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
12178                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12179 #ifdef  SCTP_PACKET_LOGGING
12180                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12181                         sctp_packet_log(mout, len);
12182 #endif
12183                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12184                 if (port) {
12185 #if defined(SCTP_WITH_NO_CSUM)
12186                         SCTP_STAT_INCR(sctps_sendnocrc);
12187 #else
12188                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12189                         SCTP_STAT_INCR(sctps_sendswcrc);
12190 #endif
12191                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12192                                 udp->uh_sum = 0xffff;
12193                         }
12194                 } else {
12195 #if defined(SCTP_WITH_NO_CSUM)
12196                         SCTP_STAT_INCR(sctps_sendnocrc);
12197 #else
12198                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12199                         mout->m_pkthdr.csum_data = 0;
12200                         SCTP_STAT_INCR(sctps_sendhwcrc);
12201 #endif
12202                 }
12203                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12204
12205                 /* Free the route if we got one back */
12206                 if (ro.ro_rt)
12207                         RTFREE(ro.ro_rt);
12208         }
12209 #endif
12210         SCTP_STAT_INCR(sctps_sendpackets);
12211         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12212         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12213 }
12214
12215 void
12216 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12217     uint32_t vrf_id, uint16_t port)
12218 {
12219         struct mbuf *o_pak;
12220         struct sctphdr *sh, *sh_out;
12221         struct sctp_chunkhdr *ch;
12222         struct ip *iph;
12223         struct udphdr *udp = NULL;
12224         struct mbuf *mout;
12225         int iphlen_out, len;
12226
12227 #ifdef INET
12228         struct ip *iph_out;
12229
12230 #endif
12231 #ifdef INET6
12232         struct ip6_hdr *ip6, *ip6_out;
12233
12234 #endif
12235
12236         iph = mtod(m, struct ip *);
12237         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12238         switch (iph->ip_v) {
12239 #ifdef INET
12240         case IPVERSION:
12241                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12242                 break;
12243 #endif
12244 #ifdef INET6
12245         case IPV6_VERSION >> 4:
12246                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12247                 break;
12248 #endif
12249         default:
12250                 if (scm) {
12251                         sctp_m_freem(scm);
12252                 }
12253                 return;
12254         }
12255         if (port) {
12256                 len += sizeof(struct udphdr);
12257         }
12258         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12259         if (mout == NULL) {
12260                 if (scm) {
12261                         sctp_m_freem(scm);
12262                 }
12263                 return;
12264         }
12265         SCTP_BUF_RESV_UF(mout, max_linkhdr);
12266         SCTP_BUF_LEN(mout) = len;
12267         SCTP_BUF_NEXT(mout) = scm;
12268         if (m->m_flags & M_FLOWID) {
12269                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12270                 mout->m_flags |= M_FLOWID;
12271         }
12272 #ifdef INET
12273         iph_out = NULL;
12274 #endif
12275 #ifdef INET6
12276         ip6_out = NULL;
12277 #endif
12278         switch (iph->ip_v) {
12279 #ifdef INET
12280         case IPVERSION:
12281                 iph_out = mtod(mout, struct ip *);
12282
12283                 /* Fill in the IP header for the ABORT */
12284                 iph_out->ip_v = IPVERSION;
12285                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12286                 iph_out->ip_tos = (u_char)0;
12287                 iph_out->ip_id = 0;
12288                 iph_out->ip_off = 0;
12289                 iph_out->ip_ttl = MAXTTL;
12290                 if (port) {
12291                         iph_out->ip_p = IPPROTO_UDP;
12292                 } else {
12293                         iph_out->ip_p = IPPROTO_SCTP;
12294                 }
12295                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12296                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12297                 /* let IP layer calculate this */
12298                 iph_out->ip_sum = 0;
12299
12300                 iphlen_out = sizeof(struct ip);
12301                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12302                 break;
12303 #endif
12304 #ifdef INET6
12305         case IPV6_VERSION >> 4:
12306                 ip6 = (struct ip6_hdr *)iph;
12307                 ip6_out = mtod(mout, struct ip6_hdr *);
12308
12309                 /* Fill in the IP6 header for the ABORT */
12310                 ip6_out->ip6_flow = ip6->ip6_flow;
12311                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12312                 if (port) {
12313                         ip6_out->ip6_nxt = IPPROTO_UDP;
12314                 } else {
12315                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12316                 }
12317                 ip6_out->ip6_src = ip6->ip6_dst;
12318                 ip6_out->ip6_dst = ip6->ip6_src;
12319
12320                 iphlen_out = sizeof(struct ip6_hdr);
12321                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12322                 break;
12323 #endif                          /* INET6 */
12324         default:
12325                 /* Currently not supported */
12326                 sctp_m_freem(mout);
12327                 return;
12328         }
12329
12330         udp = (struct udphdr *)sh_out;
12331         if (port) {
12332                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12333                         sctp_m_freem(mout);
12334                         return;
12335                 }
12336                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12337                 udp->uh_dport = port;
12338                 /* set udp->uh_ulen later */
12339                 udp->uh_sum = 0;
12340                 iphlen_out += sizeof(struct udphdr);
12341                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12342         }
12343         sh_out->src_port = sh->dest_port;
12344         sh_out->dest_port = sh->src_port;
12345         sh_out->v_tag = vtag;
12346         sh_out->checksum = 0;
12347
12348         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12349         ch->chunk_type = SCTP_OPERATION_ERROR;
12350         ch->chunk_flags = 0;
12351
12352         if (scm) {
12353                 struct mbuf *m_tmp = scm;
12354                 int cause_len = 0;
12355
12356                 /* get length of the err_cause chain */
12357                 while (m_tmp != NULL) {
12358                         cause_len += SCTP_BUF_LEN(m_tmp);
12359                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12360                 }
12361                 len = SCTP_BUF_LEN(mout) + cause_len;
12362                 if (cause_len % 4) {
12363                         /* need pad at end of chunk */
12364                         uint32_t cpthis = 0;
12365                         int padlen;
12366
12367                         padlen = 4 - (len % 4);
12368                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12369                         len += padlen;
12370                 }
12371                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12372         } else {
12373                 len = SCTP_BUF_LEN(mout);
12374                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12375         }
12376
12377         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12378                 /* no mbuf's */
12379                 sctp_m_freem(mout);
12380                 return;
12381         }
12382 #ifdef INET
12383         if (iph_out != NULL) {
12384                 sctp_route_t ro;
12385                 int ret;
12386
12387                 /* zap the stack pointer to the route */
12388                 bzero(&ro, sizeof ro);
12389                 if (port) {
12390                         udp->uh_ulen = htons(len - sizeof(struct ip));
12391                         if (V_udp_cksum) {
12392                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12393                         } else {
12394                                 udp->uh_sum = 0;
12395                         }
12396                 }
12397                 /* set IPv4 length */
12398                 iph_out->ip_len = len;
12399                 /* out it goes */
12400 #ifdef  SCTP_PACKET_LOGGING
12401                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12402                         sctp_packet_log(mout, len);
12403 #endif
12404                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12405                 if (port) {
12406 #if defined(SCTP_WITH_NO_CSUM)
12407                         SCTP_STAT_INCR(sctps_sendnocrc);
12408 #else
12409                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12410                         SCTP_STAT_INCR(sctps_sendswcrc);
12411 #endif
12412                         if (V_udp_cksum) {
12413                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12414                         }
12415                 } else {
12416 #if defined(SCTP_WITH_NO_CSUM)
12417                         SCTP_STAT_INCR(sctps_sendnocrc);
12418 #else
12419                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12420                         mout->m_pkthdr.csum_data = 0;
12421                         SCTP_STAT_INCR(sctps_sendhwcrc);
12422 #endif
12423                 }
12424                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12425
12426                 /* Free the route if we got one back */
12427                 if (ro.ro_rt)
12428                         RTFREE(ro.ro_rt);
12429         }
12430 #endif
12431 #ifdef INET6
12432         if (ip6_out != NULL) {
12433                 struct route_in6 ro;
12434                 int ret;
12435                 struct ifnet *ifp = NULL;
12436
12437                 /* zap the stack pointer to the route */
12438                 bzero(&ro, sizeof(ro));
12439                 if (port) {
12440                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12441                 }
12442                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12443 #ifdef  SCTP_PACKET_LOGGING
12444                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12445                         sctp_packet_log(mout, len);
12446 #endif
12447                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12448                 if (port) {
12449 #if defined(SCTP_WITH_NO_CSUM)
12450                         SCTP_STAT_INCR(sctps_sendnocrc);
12451 #else
12452                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12453                         SCTP_STAT_INCR(sctps_sendswcrc);
12454 #endif
12455                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12456                                 udp->uh_sum = 0xffff;
12457                         }
12458                 } else {
12459 #if defined(SCTP_WITH_NO_CSUM)
12460                         SCTP_STAT_INCR(sctps_sendnocrc);
12461 #else
12462                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12463                         mout->m_pkthdr.csum_data = 0;
12464                         SCTP_STAT_INCR(sctps_sendhwcrc);
12465 #endif
12466                 }
12467                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12468
12469                 /* Free the route if we got one back */
12470                 if (ro.ro_rt)
12471                         RTFREE(ro.ro_rt);
12472         }
12473 #endif
12474         SCTP_STAT_INCR(sctps_sendpackets);
12475         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12476         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12477 }
12478
12479 static struct mbuf *
12480 sctp_copy_resume(struct uio *uio,
12481     int max_send_len,
12482     int user_marks_eor,
12483     int *error,
12484     uint32_t * sndout,
12485     struct mbuf **new_tail)
12486 {
12487         struct mbuf *m;
12488
12489         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12490             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12491         if (m == NULL) {
12492                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12493                 *error = ENOMEM;
12494         } else {
12495                 *sndout = m_length(m, NULL);
12496                 *new_tail = m_last(m);
12497         }
12498         return (m);
12499 }
12500
12501 static int
12502 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12503     struct uio *uio,
12504     int resv_upfront)
12505 {
12506         int left;
12507
12508         left = sp->length;
12509         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12510             resv_upfront, 0);
12511         if (sp->data == NULL) {
12512                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12513                 return (ENOMEM);
12514         }
12515         sp->tail_mbuf = m_last(sp->data);
12516         return (0);
12517 }
12518
12519
12520
12521 static struct sctp_stream_queue_pending *
12522 sctp_copy_it_in(struct sctp_tcb *stcb,
12523     struct sctp_association *asoc,
12524     struct sctp_sndrcvinfo *srcv,
12525     struct uio *uio,
12526     struct sctp_nets *net,
12527     int max_send_len,
12528     int user_marks_eor,
12529     int *error)
12530 {
12531         /*-
12532          * This routine must be very careful in its work. Protocol
12533          * processing is up and running so care must be taken to spl...()
12534          * when you need to do something that may effect the stcb/asoc. The
12535          * sb is locked however. When data is copied the protocol processing
12536          * should be enabled since this is a slower operation...
12537          */
12538         struct sctp_stream_queue_pending *sp = NULL;
12539         int resv_in_first;
12540
12541         *error = 0;
12542         /* Now can we send this? */
12543         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12544             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12545             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12546             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12547                 /* got data while shutting down */
12548                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12549                 *error = ECONNRESET;
12550                 goto out_now;
12551         }
12552         sctp_alloc_a_strmoq(stcb, sp);
12553         if (sp == NULL) {
12554                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12555                 *error = ENOMEM;
12556                 goto out_now;
12557         }
12558         sp->act_flags = 0;
12559         sp->sender_all_done = 0;
12560         sp->sinfo_flags = srcv->sinfo_flags;
12561         sp->timetolive = srcv->sinfo_timetolive;
12562         sp->ppid = srcv->sinfo_ppid;
12563         sp->context = srcv->sinfo_context;
12564         sp->strseq = 0;
12565         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12566
12567         sp->stream = srcv->sinfo_stream;
12568         sp->length = min(uio->uio_resid, max_send_len);
12569         if ((sp->length == (uint32_t) uio->uio_resid) &&
12570             ((user_marks_eor == 0) ||
12571             (srcv->sinfo_flags & SCTP_EOF) ||
12572             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12573                 sp->msg_is_complete = 1;
12574         } else {
12575                 sp->msg_is_complete = 0;
12576         }
12577         sp->sender_all_done = 0;
12578         sp->some_taken = 0;
12579         sp->put_last_out = 0;
12580         resv_in_first = sizeof(struct sctp_data_chunk);
12581         sp->data = sp->tail_mbuf = NULL;
12582         if (sp->length == 0) {
12583                 *error = 0;
12584                 goto skip_copy;
12585         }
12586         if (srcv->sinfo_keynumber_valid) {
12587                 sp->auth_keyid = srcv->sinfo_keynumber;
12588         } else {
12589                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12590         }
12591         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12592                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12593                 sp->holds_key_ref = 1;
12594         }
12595         *error = sctp_copy_one(sp, uio, resv_in_first);
12596 skip_copy:
12597         if (*error) {
12598                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12599                 sp = NULL;
12600         } else {
12601                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12602                         sp->net = net;
12603                         atomic_add_int(&sp->net->ref_count, 1);
12604                 } else {
12605                         sp->net = NULL;
12606                 }
12607                 sctp_set_prsctp_policy(sp);
12608         }
12609 out_now:
12610         return (sp);
12611 }
12612
12613
12614 int
12615 sctp_sosend(struct socket *so,
12616     struct sockaddr *addr,
12617     struct uio *uio,
12618     struct mbuf *top,
12619     struct mbuf *control,
12620     int flags,
12621     struct thread *p
12622 )
12623 {
12624         int error, use_sndinfo = 0;
12625         struct sctp_sndrcvinfo sndrcvninfo;
12626         struct sockaddr *addr_to_use;
12627
12628 #if defined(INET) && defined(INET6)
12629         struct sockaddr_in sin;
12630
12631 #endif
12632
12633         if (control) {
12634                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12635                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12636                     sizeof(sndrcvninfo))) {
12637                         /* got one */
12638                         use_sndinfo = 1;
12639                 }
12640         }
12641         addr_to_use = addr;
12642 #if defined(INET) && defined(INET6)
12643         if ((addr) && (addr->sa_family == AF_INET6)) {
12644                 struct sockaddr_in6 *sin6;
12645
12646                 sin6 = (struct sockaddr_in6 *)addr;
12647                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12648                         in6_sin6_2_sin(&sin, sin6);
12649                         addr_to_use = (struct sockaddr *)&sin;
12650                 }
12651         }
12652 #endif
12653         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12654             control,
12655             flags,
12656             use_sndinfo ? &sndrcvninfo : NULL
12657             ,p
12658             );
12659         return (error);
12660 }
12661
12662
12663 int
12664 sctp_lower_sosend(struct socket *so,
12665     struct sockaddr *addr,
12666     struct uio *uio,
12667     struct mbuf *i_pak,
12668     struct mbuf *control,
12669     int flags,
12670     struct sctp_sndrcvinfo *srcv
12671     ,
12672     struct thread *p
12673 )
12674 {
12675         unsigned int sndlen = 0, max_len;
12676         int error, len;
12677         struct mbuf *top = NULL;
12678         int queue_only = 0, queue_only_for_init = 0;
12679         int free_cnt_applied = 0;
12680         int un_sent;
12681         int now_filled = 0;
12682         unsigned int inqueue_bytes = 0;
12683         struct sctp_block_entry be;
12684         struct sctp_inpcb *inp;
12685         struct sctp_tcb *stcb = NULL;
12686         struct timeval now;
12687         struct sctp_nets *net;
12688         struct sctp_association *asoc;
12689         struct sctp_inpcb *t_inp;
12690         int user_marks_eor;
12691         int create_lock_applied = 0;
12692         int nagle_applies = 0;
12693         int some_on_control = 0;
12694         int got_all_of_the_send = 0;
12695         int hold_tcblock = 0;
12696         int non_blocking = 0;
12697         uint32_t local_add_more, local_soresv = 0;
12698         uint16_t port;
12699         uint16_t sinfo_flags;
12700         sctp_assoc_t sinfo_assoc_id;
12701
12702         error = 0;
12703         net = NULL;
12704         stcb = NULL;
12705         asoc = NULL;
12706
12707         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12708         if (inp == NULL) {
12709                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12710                 error = EINVAL;
12711                 if (i_pak) {
12712                         SCTP_RELEASE_PKT(i_pak);
12713                 }
12714                 return (error);
12715         }
12716         if ((uio == NULL) && (i_pak == NULL)) {
12717                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12718                 return (EINVAL);
12719         }
12720         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12721         atomic_add_int(&inp->total_sends, 1);
12722         if (uio) {
12723                 if (uio->uio_resid < 0) {
12724                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12725                         return (EINVAL);
12726                 }
12727                 sndlen = uio->uio_resid;
12728         } else {
12729                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12730                 sndlen = SCTP_HEADER_LEN(i_pak);
12731         }
12732         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12733             addr,
12734             sndlen);
12735         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12736             (inp->sctp_socket->so_qlimit)) {
12737                 /* The listener can NOT send */
12738                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12739                 error = ENOTCONN;
12740                 goto out_unlocked;
12741         }
12742         /**
12743          * Pre-screen address, if one is given the sin-len
12744          * must be set correctly!
12745          */
12746         if (addr) {
12747                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12748
12749                 switch (raddr->sa.sa_family) {
12750 #if defined(INET)
12751                 case AF_INET:
12752                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12753                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12754                                 error = EINVAL;
12755                                 goto out_unlocked;
12756                         }
12757                         port = raddr->sin.sin_port;
12758                         break;
12759 #endif
12760 #if defined(INET6)
12761                 case AF_INET6:
12762                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12763                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12764                                 error = EINVAL;
12765                                 goto out_unlocked;
12766                         }
12767                         port = raddr->sin6.sin6_port;
12768                         break;
12769 #endif
12770                 default:
12771                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12772                         error = EAFNOSUPPORT;
12773                         goto out_unlocked;
12774                 }
12775         } else
12776                 port = 0;
12777
12778         if (srcv) {
12779                 sinfo_flags = srcv->sinfo_flags;
12780                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12781                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12782                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12783                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12784                         error = EINVAL;
12785                         goto out_unlocked;
12786                 }
12787                 if (srcv->sinfo_flags)
12788                         SCTP_STAT_INCR(sctps_sends_with_flags);
12789         } else {
12790                 sinfo_flags = inp->def_send.sinfo_flags;
12791                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12792         }
12793         if (sinfo_flags & SCTP_SENDALL) {
12794                 /* its a sendall */
12795                 error = sctp_sendall(inp, uio, top, srcv);
12796                 top = NULL;
12797                 goto out_unlocked;
12798         }
12799         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12800                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12801                 error = EINVAL;
12802                 goto out_unlocked;
12803         }
12804         /* now we must find the assoc */
12805         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12806             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12807                 SCTP_INP_RLOCK(inp);
12808                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12809                 if (stcb) {
12810                         SCTP_TCB_LOCK(stcb);
12811                         hold_tcblock = 1;
12812                 }
12813                 SCTP_INP_RUNLOCK(inp);
12814         } else if (sinfo_assoc_id) {
12815                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12816         } else if (addr) {
12817                 /*-
12818                  * Since we did not use findep we must
12819                  * increment it, and if we don't find a tcb
12820                  * decrement it.
12821                  */
12822                 SCTP_INP_WLOCK(inp);
12823                 SCTP_INP_INCR_REF(inp);
12824                 SCTP_INP_WUNLOCK(inp);
12825                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12826                 if (stcb == NULL) {
12827                         SCTP_INP_WLOCK(inp);
12828                         SCTP_INP_DECR_REF(inp);
12829                         SCTP_INP_WUNLOCK(inp);
12830                 } else {
12831                         hold_tcblock = 1;
12832                 }
12833         }
12834         if ((stcb == NULL) && (addr)) {
12835                 /* Possible implicit send? */
12836                 SCTP_ASOC_CREATE_LOCK(inp);
12837                 create_lock_applied = 1;
12838                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12839                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12840                         /* Should I really unlock ? */
12841                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12842                         error = EINVAL;
12843                         goto out_unlocked;
12844
12845                 }
12846                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12847                     (addr->sa_family == AF_INET6)) {
12848                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12849                         error = EINVAL;
12850                         goto out_unlocked;
12851                 }
12852                 SCTP_INP_WLOCK(inp);
12853                 SCTP_INP_INCR_REF(inp);
12854                 SCTP_INP_WUNLOCK(inp);
12855                 /* With the lock applied look again */
12856                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12857                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12858                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12859                 }
12860                 if (stcb == NULL) {
12861                         SCTP_INP_WLOCK(inp);
12862                         SCTP_INP_DECR_REF(inp);
12863                         SCTP_INP_WUNLOCK(inp);
12864                 } else {
12865                         hold_tcblock = 1;
12866                 }
12867                 if (error) {
12868                         goto out_unlocked;
12869                 }
12870                 if (t_inp != inp) {
12871                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12872                         error = ENOTCONN;
12873                         goto out_unlocked;
12874                 }
12875         }
12876         if (stcb == NULL) {
12877                 if (addr == NULL) {
12878                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12879                         error = ENOENT;
12880                         goto out_unlocked;
12881                 } else {
12882                         /* We must go ahead and start the INIT process */
12883                         uint32_t vrf_id;
12884
12885                         if ((sinfo_flags & SCTP_ABORT) ||
12886                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12887                                 /*-
12888                                  * User asks to abort a non-existant assoc,
12889                                  * or EOF a non-existant assoc with no data
12890                                  */
12891                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12892                                 error = ENOENT;
12893                                 goto out_unlocked;
12894                         }
12895                         /* get an asoc/stcb struct */
12896                         vrf_id = inp->def_vrf_id;
12897 #ifdef INVARIANTS
12898                         if (create_lock_applied == 0) {
12899                                 panic("Error, should hold create lock and I don't?");
12900                         }
12901 #endif
12902                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12903                             p
12904                             );
12905                         if (stcb == NULL) {
12906                                 /* Error is setup for us in the call */
12907                                 goto out_unlocked;
12908                         }
12909                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12910                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12911                                 /*
12912                                  * Set the connected flag so we can queue
12913                                  * data
12914                                  */
12915                                 soisconnecting(so);
12916                         }
12917                         hold_tcblock = 1;
12918                         if (create_lock_applied) {
12919                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12920                                 create_lock_applied = 0;
12921                         } else {
12922                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12923                         }
12924                         /*
12925                          * Turn on queue only flag to prevent data from
12926                          * being sent
12927                          */
12928                         queue_only = 1;
12929                         asoc = &stcb->asoc;
12930                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12931                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12932
12933                         /* initialize authentication params for the assoc */
12934                         sctp_initialize_auth_params(inp, stcb);
12935
12936                         if (control) {
12937                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12938                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12939                                         hold_tcblock = 0;
12940                                         stcb = NULL;
12941                                         goto out_unlocked;
12942                                 }
12943                         }
12944                         /* out with the INIT */
12945                         queue_only_for_init = 1;
12946                         /*-
12947                          * we may want to dig in after this call and adjust the MTU
12948                          * value. It defaulted to 1500 (constant) but the ro
12949                          * structure may now have an update and thus we may need to
12950                          * change it BEFORE we append the message.
12951                          */
12952                 }
12953         } else
12954                 asoc = &stcb->asoc;
12955         if (srcv == NULL)
12956                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12957         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12958                 if (addr)
12959                         net = sctp_findnet(stcb, addr);
12960                 else
12961                         net = NULL;
12962                 if ((net == NULL) ||
12963                     ((port != 0) && (port != stcb->rport))) {
12964                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12965                         error = EINVAL;
12966                         goto out_unlocked;
12967                 }
12968         } else {
12969                 if (stcb->asoc.alternate) {
12970                         net = stcb->asoc.alternate;
12971                 } else {
12972                         net = stcb->asoc.primary_destination;
12973                 }
12974         }
12975         atomic_add_int(&stcb->total_sends, 1);
12976         /* Keep the stcb from being freed under our feet */
12977         atomic_add_int(&asoc->refcnt, 1);
12978         free_cnt_applied = 1;
12979
12980         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12981                 if (sndlen > asoc->smallest_mtu) {
12982                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12983                         error = EMSGSIZE;
12984                         goto out_unlocked;
12985                 }
12986         }
12987         if (SCTP_SO_IS_NBIO(so)
12988             || (flags & MSG_NBIO)
12989             ) {
12990                 non_blocking = 1;
12991         }
12992         /* would we block? */
12993         if (non_blocking) {
12994                 if (hold_tcblock == 0) {
12995                         SCTP_TCB_LOCK(stcb);
12996                         hold_tcblock = 1;
12997                 }
12998                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12999                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
13000                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13001                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
13002                         if (sndlen > SCTP_SB_LIMIT_SND(so))
13003                                 error = EMSGSIZE;
13004                         else
13005                                 error = EWOULDBLOCK;
13006                         goto out_unlocked;
13007                 }
13008                 stcb->asoc.sb_send_resv += sndlen;
13009                 SCTP_TCB_UNLOCK(stcb);
13010                 hold_tcblock = 0;
13011         } else {
13012                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
13013         }
13014         local_soresv = sndlen;
13015         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13016                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13017                 error = ECONNRESET;
13018                 goto out_unlocked;
13019         }
13020         if (create_lock_applied) {
13021                 SCTP_ASOC_CREATE_UNLOCK(inp);
13022                 create_lock_applied = 0;
13023         }
13024         if (asoc->stream_reset_outstanding) {
13025                 /*
13026                  * Can't queue any data while stream reset is underway.
13027                  */
13028                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
13029                 error = EAGAIN;
13030                 goto out_unlocked;
13031         }
13032         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
13033             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
13034                 queue_only = 1;
13035         }
13036         /* we are now done with all control */
13037         if (control) {
13038                 sctp_m_freem(control);
13039                 control = NULL;
13040         }
13041         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
13042             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13043             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13044             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13045                 if (srcv->sinfo_flags & SCTP_ABORT) {
13046                         ;
13047                 } else {
13048                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13049                         error = ECONNRESET;
13050                         goto out_unlocked;
13051                 }
13052         }
13053         /* Ok, we will attempt a msgsnd :> */
13054         if (p) {
13055                 p->td_ru.ru_msgsnd++;
13056         }
13057         /* Are we aborting? */
13058         if (srcv->sinfo_flags & SCTP_ABORT) {
13059                 struct mbuf *mm;
13060                 int tot_demand, tot_out = 0, max_out;
13061
13062                 SCTP_STAT_INCR(sctps_sends_with_abort);
13063                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
13064                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
13065                         /* It has to be up before we abort */
13066                         /* how big is the user initiated abort? */
13067                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13068                         error = EINVAL;
13069                         goto out;
13070                 }
13071                 if (hold_tcblock) {
13072                         SCTP_TCB_UNLOCK(stcb);
13073                         hold_tcblock = 0;
13074                 }
13075                 if (top) {
13076                         struct mbuf *cntm = NULL;
13077
13078                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
13079                         if (sndlen != 0) {
13080                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13081                                         tot_out += SCTP_BUF_LEN(cntm);
13082                                 }
13083                         }
13084                 } else {
13085                         /* Must fit in a MTU */
13086                         tot_out = sndlen;
13087                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13088                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13089                                 /* To big */
13090                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13091                                 error = EMSGSIZE;
13092                                 goto out;
13093                         }
13094                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
13095                 }
13096                 if (mm == NULL) {
13097                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13098                         error = ENOMEM;
13099                         goto out;
13100                 }
13101                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13102                 max_out -= sizeof(struct sctp_abort_msg);
13103                 if (tot_out > max_out) {
13104                         tot_out = max_out;
13105                 }
13106                 if (mm) {
13107                         struct sctp_paramhdr *ph;
13108
13109                         /* now move forward the data pointer */
13110                         ph = mtod(mm, struct sctp_paramhdr *);
13111                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13112                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
13113                         ph++;
13114                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13115                         if (top == NULL) {
13116                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13117                                 if (error) {
13118                                         /*-
13119                                          * Here if we can't get his data we
13120                                          * still abort we just don't get to
13121                                          * send the users note :-0
13122                                          */
13123                                         sctp_m_freem(mm);
13124                                         mm = NULL;
13125                                 }
13126                         } else {
13127                                 if (sndlen != 0) {
13128                                         SCTP_BUF_NEXT(mm) = top;
13129                                 }
13130                         }
13131                 }
13132                 if (hold_tcblock == 0) {
13133                         SCTP_TCB_LOCK(stcb);
13134                 }
13135                 atomic_add_int(&stcb->asoc.refcnt, -1);
13136                 free_cnt_applied = 0;
13137                 /* release this lock, otherwise we hang on ourselves */
13138                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13139                 /* now relock the stcb so everything is sane */
13140                 hold_tcblock = 0;
13141                 stcb = NULL;
13142                 /*
13143                  * In this case top is already chained to mm avoid double
13144                  * free, since we free it below if top != NULL and driver
13145                  * would free it after sending the packet out
13146                  */
13147                 if (sndlen != 0) {
13148                         top = NULL;
13149                 }
13150                 goto out_unlocked;
13151         }
13152         /* Calculate the maximum we can send */
13153         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13154         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13155                 if (non_blocking) {
13156                         /* we already checked for non-blocking above. */
13157                         max_len = sndlen;
13158                 } else {
13159                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13160                 }
13161         } else {
13162                 max_len = 0;
13163         }
13164         if (hold_tcblock) {
13165                 SCTP_TCB_UNLOCK(stcb);
13166                 hold_tcblock = 0;
13167         }
13168         /* Is the stream no. valid? */
13169         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
13170                 /* Invalid stream number */
13171                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13172                 error = EINVAL;
13173                 goto out_unlocked;
13174         }
13175         if (asoc->strmout == NULL) {
13176                 /* huh? software error */
13177                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13178                 error = EFAULT;
13179                 goto out_unlocked;
13180         }
13181         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13182         if ((user_marks_eor == 0) &&
13183             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13184                 /* It will NEVER fit */
13185                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13186                 error = EMSGSIZE;
13187                 goto out_unlocked;
13188         }
13189         if ((uio == NULL) && user_marks_eor) {
13190                 /*-
13191                  * We do not support eeor mode for
13192                  * sending with mbuf chains (like sendfile).
13193                  */
13194                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13195                 error = EINVAL;
13196                 goto out_unlocked;
13197         }
13198         if (user_marks_eor) {
13199                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13200         } else {
13201                 /*-
13202                  * For non-eeor the whole message must fit in
13203                  * the socket send buffer.
13204                  */
13205                 local_add_more = sndlen;
13206         }
13207         len = 0;
13208         if (non_blocking) {
13209                 goto skip_preblock;
13210         }
13211         if (((max_len <= local_add_more) &&
13212             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13213             (max_len == 0) ||
13214             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13215                 /* No room right now ! */
13216                 SOCKBUF_LOCK(&so->so_snd);
13217                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13218                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13219                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13220                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13221                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13222                             inqueue_bytes,
13223                             local_add_more,
13224                             stcb->asoc.stream_queue_cnt,
13225                             stcb->asoc.chunks_on_out_queue,
13226                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13227                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13228                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13229                         }
13230                         be.error = 0;
13231                         stcb->block_entry = &be;
13232                         error = sbwait(&so->so_snd);
13233                         stcb->block_entry = NULL;
13234                         if (error || so->so_error || be.error) {
13235                                 if (error == 0) {
13236                                         if (so->so_error)
13237                                                 error = so->so_error;
13238                                         if (be.error) {
13239                                                 error = be.error;
13240                                         }
13241                                 }
13242                                 SOCKBUF_UNLOCK(&so->so_snd);
13243                                 goto out_unlocked;
13244                         }
13245                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13246                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13247                                     asoc, stcb->asoc.total_output_queue_size);
13248                         }
13249                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13250                                 goto out_unlocked;
13251                         }
13252                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13253                 }
13254                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13255                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13256                 } else {
13257                         max_len = 0;
13258                 }
13259                 SOCKBUF_UNLOCK(&so->so_snd);
13260         }
13261 skip_preblock:
13262         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13263                 goto out_unlocked;
13264         }
13265         /*
13266          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13267          * case NOTE: uio will be null when top/mbuf is passed
13268          */
13269         if (sndlen == 0) {
13270                 if (srcv->sinfo_flags & SCTP_EOF) {
13271                         got_all_of_the_send = 1;
13272                         goto dataless_eof;
13273                 } else {
13274                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13275                         error = EINVAL;
13276                         goto out;
13277                 }
13278         }
13279         if (top == NULL) {
13280                 struct sctp_stream_queue_pending *sp;
13281                 struct sctp_stream_out *strm;
13282                 uint32_t sndout;
13283
13284                 SCTP_TCB_SEND_LOCK(stcb);
13285                 if ((asoc->stream_locked) &&
13286                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13287                         SCTP_TCB_SEND_UNLOCK(stcb);
13288                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13289                         error = EINVAL;
13290                         goto out;
13291                 }
13292                 SCTP_TCB_SEND_UNLOCK(stcb);
13293
13294                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13295                 if (strm->last_msg_incomplete == 0) {
13296         do_a_copy_in:
13297                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13298                         if ((sp == NULL) || (error)) {
13299                                 goto out;
13300                         }
13301                         SCTP_TCB_SEND_LOCK(stcb);
13302                         if (sp->msg_is_complete) {
13303                                 strm->last_msg_incomplete = 0;
13304                                 asoc->stream_locked = 0;
13305                         } else {
13306                                 /*
13307                                  * Just got locked to this guy in case of an
13308                                  * interrupt.
13309                                  */
13310                                 strm->last_msg_incomplete = 1;
13311                                 asoc->stream_locked = 1;
13312                                 asoc->stream_locked_on = srcv->sinfo_stream;
13313                                 sp->sender_all_done = 0;
13314                         }
13315                         sctp_snd_sb_alloc(stcb, sp->length);
13316                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13317                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13318                                 sp->strseq = strm->next_sequence_sent;
13319                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13320                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13321                                             (uintptr_t) stcb, sp->length,
13322                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13323                                 }
13324                                 strm->next_sequence_sent++;
13325                         } else {
13326                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13327                         }
13328                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13329                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13330                         SCTP_TCB_SEND_UNLOCK(stcb);
13331                 } else {
13332                         SCTP_TCB_SEND_LOCK(stcb);
13333                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13334                         SCTP_TCB_SEND_UNLOCK(stcb);
13335                         if (sp == NULL) {
13336                                 /* ???? Huh ??? last msg is gone */
13337 #ifdef INVARIANTS
13338                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13339 #else
13340                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13341                                 strm->last_msg_incomplete = 0;
13342 #endif
13343                                 goto do_a_copy_in;
13344
13345                         }
13346                 }
13347                 while (uio->uio_resid > 0) {
13348                         /* How much room do we have? */
13349                         struct mbuf *new_tail, *mm;
13350
13351                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13352                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13353                         else
13354                                 max_len = 0;
13355
13356                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13357                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13358                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13359                                 sndout = 0;
13360                                 new_tail = NULL;
13361                                 if (hold_tcblock) {
13362                                         SCTP_TCB_UNLOCK(stcb);
13363                                         hold_tcblock = 0;
13364                                 }
13365                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13366                                 if ((mm == NULL) || error) {
13367                                         if (mm) {
13368                                                 sctp_m_freem(mm);
13369                                         }
13370                                         goto out;
13371                                 }
13372                                 /* Update the mbuf and count */
13373                                 SCTP_TCB_SEND_LOCK(stcb);
13374                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13375                                         /*
13376                                          * we need to get out. Peer probably
13377                                          * aborted.
13378                                          */
13379                                         sctp_m_freem(mm);
13380                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13381                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13382                                                 error = ECONNRESET;
13383                                         }
13384                                         SCTP_TCB_SEND_UNLOCK(stcb);
13385                                         goto out;
13386                                 }
13387                                 if (sp->tail_mbuf) {
13388                                         /* tack it to the end */
13389                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13390                                         sp->tail_mbuf = new_tail;
13391                                 } else {
13392                                         /* A stolen mbuf */
13393                                         sp->data = mm;
13394                                         sp->tail_mbuf = new_tail;
13395                                 }
13396                                 sctp_snd_sb_alloc(stcb, sndout);
13397                                 atomic_add_int(&sp->length, sndout);
13398                                 len += sndout;
13399
13400                                 /* Did we reach EOR? */
13401                                 if ((uio->uio_resid == 0) &&
13402                                     ((user_marks_eor == 0) ||
13403                                     (srcv->sinfo_flags & SCTP_EOF) ||
13404                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13405                                         sp->msg_is_complete = 1;
13406                                 } else {
13407                                         sp->msg_is_complete = 0;
13408                                 }
13409                                 SCTP_TCB_SEND_UNLOCK(stcb);
13410                         }
13411                         if (uio->uio_resid == 0) {
13412                                 /* got it all? */
13413                                 continue;
13414                         }
13415                         /* PR-SCTP? */
13416                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13417                                 /*
13418                                  * This is ugly but we must assure locking
13419                                  * order
13420                                  */
13421                                 if (hold_tcblock == 0) {
13422                                         SCTP_TCB_LOCK(stcb);
13423                                         hold_tcblock = 1;
13424                                 }
13425                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13426                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13427                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13428                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13429                                 else
13430                                         max_len = 0;
13431                                 if (max_len > 0) {
13432                                         continue;
13433                                 }
13434                                 SCTP_TCB_UNLOCK(stcb);
13435                                 hold_tcblock = 0;
13436                         }
13437                         /* wait for space now */
13438                         if (non_blocking) {
13439                                 /* Non-blocking io in place out */
13440                                 goto skip_out_eof;
13441                         }
13442                         /* What about the INIT, send it maybe */
13443                         if (queue_only_for_init) {
13444                                 if (hold_tcblock == 0) {
13445                                         SCTP_TCB_LOCK(stcb);
13446                                         hold_tcblock = 1;
13447                                 }
13448                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13449                                         /* a collision took us forward? */
13450                                         queue_only = 0;
13451                                 } else {
13452                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13453                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13454                                         queue_only = 1;
13455                                 }
13456                         }
13457                         if ((net->flight_size > net->cwnd) &&
13458                             (asoc->sctp_cmt_on_off == 0)) {
13459                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13460                                 queue_only = 1;
13461                         } else if (asoc->ifp_had_enobuf) {
13462                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13463                                 if (net->flight_size > (2 * net->mtu)) {
13464                                         queue_only = 1;
13465                                 }
13466                                 asoc->ifp_had_enobuf = 0;
13467                         }
13468                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13469                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13470                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13471                             (stcb->asoc.total_flight > 0) &&
13472                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13473                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13474
13475                                 /*-
13476                                  * Ok, Nagle is set on and we have data outstanding.
13477                                  * Don't send anything and let SACKs drive out the
13478                                  * data unless wen have a "full" segment to send.
13479                                  */
13480                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13481                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13482                                 }
13483                                 SCTP_STAT_INCR(sctps_naglequeued);
13484                                 nagle_applies = 1;
13485                         } else {
13486                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13487                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13488                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13489                                 }
13490                                 SCTP_STAT_INCR(sctps_naglesent);
13491                                 nagle_applies = 0;
13492                         }
13493                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13494
13495                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13496                                     nagle_applies, un_sent);
13497                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13498                                     stcb->asoc.total_flight,
13499                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13500                         }
13501                         if (queue_only_for_init)
13502                                 queue_only_for_init = 0;
13503                         if ((queue_only == 0) && (nagle_applies == 0)) {
13504                                 /*-
13505                                  * need to start chunk output
13506                                  * before blocking.. note that if
13507                                  * a lock is already applied, then
13508                                  * the input via the net is happening
13509                                  * and I don't need to start output :-D
13510                                  */
13511                                 if (hold_tcblock == 0) {
13512                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13513                                                 hold_tcblock = 1;
13514                                                 sctp_chunk_output(inp,
13515                                                     stcb,
13516                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13517                                         }
13518                                 } else {
13519                                         sctp_chunk_output(inp,
13520                                             stcb,
13521                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13522                                 }
13523                                 if (hold_tcblock == 1) {
13524                                         SCTP_TCB_UNLOCK(stcb);
13525                                         hold_tcblock = 0;
13526                                 }
13527                         }
13528                         SOCKBUF_LOCK(&so->so_snd);
13529                         /*-
13530                          * This is a bit strange, but I think it will
13531                          * work. The total_output_queue_size is locked and
13532                          * protected by the TCB_LOCK, which we just released.
13533                          * There is a race that can occur between releasing it
13534                          * above, and me getting the socket lock, where sacks
13535                          * come in but we have not put the SB_WAIT on the
13536                          * so_snd buffer to get the wakeup. After the LOCK
13537                          * is applied the sack_processing will also need to
13538                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13539                          * once we have the socket buffer lock if we recheck the
13540                          * size we KNOW we will get to sleep safely with the
13541                          * wakeup flag in place.
13542                          */
13543                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13544                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13545                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13546                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13547                                             asoc, uio->uio_resid);
13548                                 }
13549                                 be.error = 0;
13550                                 stcb->block_entry = &be;
13551                                 error = sbwait(&so->so_snd);
13552                                 stcb->block_entry = NULL;
13553
13554                                 if (error || so->so_error || be.error) {
13555                                         if (error == 0) {
13556                                                 if (so->so_error)
13557                                                         error = so->so_error;
13558                                                 if (be.error) {
13559                                                         error = be.error;
13560                                                 }
13561                                         }
13562                                         SOCKBUF_UNLOCK(&so->so_snd);
13563                                         goto out_unlocked;
13564                                 }
13565                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13566                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13567                                             asoc, stcb->asoc.total_output_queue_size);
13568                                 }
13569                         }
13570                         SOCKBUF_UNLOCK(&so->so_snd);
13571                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13572                                 goto out_unlocked;
13573                         }
13574                 }
13575                 SCTP_TCB_SEND_LOCK(stcb);
13576                 if (sp) {
13577                         if (sp->msg_is_complete == 0) {
13578                                 strm->last_msg_incomplete = 1;
13579                                 asoc->stream_locked = 1;
13580                                 asoc->stream_locked_on = srcv->sinfo_stream;
13581                         } else {
13582                                 sp->sender_all_done = 1;
13583                                 strm->last_msg_incomplete = 0;
13584                                 asoc->stream_locked = 0;
13585                         }
13586                 } else {
13587                         SCTP_PRINTF("Huh no sp TSNH?\n");
13588                         strm->last_msg_incomplete = 0;
13589                         asoc->stream_locked = 0;
13590                 }
13591                 SCTP_TCB_SEND_UNLOCK(stcb);
13592                 if (uio->uio_resid == 0) {
13593                         got_all_of_the_send = 1;
13594                 }
13595         } else {
13596                 /* We send in a 0, since we do NOT have any locks */
13597                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13598                 top = NULL;
13599                 if (srcv->sinfo_flags & SCTP_EOF) {
13600                         /*
13601                          * This should only happen for Panda for the mbuf
13602                          * send case, which does NOT yet support EEOR mode.
13603                          * Thus, we can just set this flag to do the proper
13604                          * EOF handling.
13605                          */
13606                         got_all_of_the_send = 1;
13607                 }
13608         }
13609         if (error) {
13610                 goto out;
13611         }
13612 dataless_eof:
13613         /* EOF thing ? */
13614         if ((srcv->sinfo_flags & SCTP_EOF) &&
13615             (got_all_of_the_send == 1) &&
13616             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13617                 int cnt;
13618
13619                 SCTP_STAT_INCR(sctps_sends_with_eof);
13620                 error = 0;
13621                 if (hold_tcblock == 0) {
13622                         SCTP_TCB_LOCK(stcb);
13623                         hold_tcblock = 1;
13624                 }
13625                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13626                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13627                     TAILQ_EMPTY(&asoc->sent_queue) &&
13628                     (cnt == 0)) {
13629                         if (asoc->locked_on_sending) {
13630                                 goto abort_anyway;
13631                         }
13632                         /* there is nothing queued to send, so I'm done... */
13633                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13634                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13635                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13636                                 struct sctp_nets *netp;
13637
13638                                 if (stcb->asoc.alternate) {
13639                                         netp = stcb->asoc.alternate;
13640                                 } else {
13641                                         netp = stcb->asoc.primary_destination;
13642                                 }
13643                                 /* only send SHUTDOWN the first time through */
13644                                 sctp_send_shutdown(stcb, netp);
13645                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13646                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13647                                 }
13648                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13649                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13650                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13651                                     netp);
13652                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13653                                     asoc->primary_destination);
13654                         }
13655                 } else {
13656                         /*-
13657                          * we still got (or just got) data to send, so set
13658                          * SHUTDOWN_PENDING
13659                          */
13660                         /*-
13661                          * XXX sockets draft says that SCTP_EOF should be
13662                          * sent with no data.  currently, we will allow user
13663                          * data to be sent first and move to
13664                          * SHUTDOWN-PENDING
13665                          */
13666                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13667                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13668                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13669                                 if (hold_tcblock == 0) {
13670                                         SCTP_TCB_LOCK(stcb);
13671                                         hold_tcblock = 1;
13672                                 }
13673                                 if (asoc->locked_on_sending) {
13674                                         /* Locked to send out the data */
13675                                         struct sctp_stream_queue_pending *sp;
13676
13677                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13678                                         if (sp) {
13679                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13680                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13681                                         }
13682                                 }
13683                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13684                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13685                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13686                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13687                         abort_anyway:
13688                                         if (free_cnt_applied) {
13689                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13690                                                 free_cnt_applied = 0;
13691                                         }
13692                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13693                                             NULL, SCTP_SO_LOCKED);
13694                                         /*
13695                                          * now relock the stcb so everything
13696                                          * is sane
13697                                          */
13698                                         hold_tcblock = 0;
13699                                         stcb = NULL;
13700                                         goto out;
13701                                 }
13702                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13703                                     asoc->primary_destination);
13704                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13705                         }
13706                 }
13707         }
13708 skip_out_eof:
13709         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13710                 some_on_control = 1;
13711         }
13712         if (queue_only_for_init) {
13713                 if (hold_tcblock == 0) {
13714                         SCTP_TCB_LOCK(stcb);
13715                         hold_tcblock = 1;
13716                 }
13717                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13718                         /* a collision took us forward? */
13719                         queue_only = 0;
13720                 } else {
13721                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13722                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13723                         queue_only = 1;
13724                 }
13725         }
13726         if ((net->flight_size > net->cwnd) &&
13727             (stcb->asoc.sctp_cmt_on_off == 0)) {
13728                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13729                 queue_only = 1;
13730         } else if (asoc->ifp_had_enobuf) {
13731                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13732                 if (net->flight_size > (2 * net->mtu)) {
13733                         queue_only = 1;
13734                 }
13735                 asoc->ifp_had_enobuf = 0;
13736         }
13737         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13738             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13739         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13740             (stcb->asoc.total_flight > 0) &&
13741             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13742             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13743                 /*-
13744                  * Ok, Nagle is set on and we have data outstanding.
13745                  * Don't send anything and let SACKs drive out the
13746                  * data unless wen have a "full" segment to send.
13747                  */
13748                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13749                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13750                 }
13751                 SCTP_STAT_INCR(sctps_naglequeued);
13752                 nagle_applies = 1;
13753         } else {
13754                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13755                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13756                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13757                 }
13758                 SCTP_STAT_INCR(sctps_naglesent);
13759                 nagle_applies = 0;
13760         }
13761         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13762                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13763                     nagle_applies, un_sent);
13764                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13765                     stcb->asoc.total_flight,
13766                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13767         }
13768         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13769                 /* we can attempt to send too. */
13770                 if (hold_tcblock == 0) {
13771                         /*
13772                          * If there is activity recv'ing sacks no need to
13773                          * send
13774                          */
13775                         if (SCTP_TCB_TRYLOCK(stcb)) {
13776                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13777                                 hold_tcblock = 1;
13778                         }
13779                 } else {
13780                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13781                 }
13782         } else if ((queue_only == 0) &&
13783                     (stcb->asoc.peers_rwnd == 0) &&
13784             (stcb->asoc.total_flight == 0)) {
13785                 /* We get to have a probe outstanding */
13786                 if (hold_tcblock == 0) {
13787                         hold_tcblock = 1;
13788                         SCTP_TCB_LOCK(stcb);
13789                 }
13790                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13791         } else if (some_on_control) {
13792                 int num_out, reason, frag_point;
13793
13794                 /* Here we do control only */
13795                 if (hold_tcblock == 0) {
13796                         hold_tcblock = 1;
13797                         SCTP_TCB_LOCK(stcb);
13798                 }
13799                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13800                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13801                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13802         }
13803         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13804             queue_only, stcb->asoc.peers_rwnd, un_sent,
13805             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13806             stcb->asoc.total_output_queue_size, error);
13807
13808 out:
13809 out_unlocked:
13810
13811         if (local_soresv && stcb) {
13812                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13813         }
13814         if (create_lock_applied) {
13815                 SCTP_ASOC_CREATE_UNLOCK(inp);
13816         }
13817         if ((stcb) && hold_tcblock) {
13818                 SCTP_TCB_UNLOCK(stcb);
13819         }
13820         if (stcb && free_cnt_applied) {
13821                 atomic_add_int(&stcb->asoc.refcnt, -1);
13822         }
13823 #ifdef INVARIANTS
13824         if (stcb) {
13825                 if (mtx_owned(&stcb->tcb_mtx)) {
13826                         panic("Leaving with tcb mtx owned?");
13827                 }
13828                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13829                         panic("Leaving with tcb send mtx owned?");
13830                 }
13831         }
13832 #endif
13833 #ifdef INVARIANTS
13834         if (inp) {
13835                 sctp_validate_no_locks(inp);
13836         } else {
13837                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13838         }
13839 #endif
13840         if (top) {
13841                 sctp_m_freem(top);
13842         }
13843         if (control) {
13844                 sctp_m_freem(control);
13845         }
13846         return (error);
13847 }
13848
13849
13850 /*
13851  * generate an AUTHentication chunk, if required
13852  */
13853 struct mbuf *
13854 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13855     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13856     struct sctp_tcb *stcb, uint8_t chunk)
13857 {
13858         struct mbuf *m_auth;
13859         struct sctp_auth_chunk *auth;
13860         int chunk_len;
13861         struct mbuf *cn;
13862
13863         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13864             (stcb == NULL))
13865                 return (m);
13866
13867         /* sysctl disabled auth? */
13868         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13869                 return (m);
13870
13871         /* peer doesn't do auth... */
13872         if (!stcb->asoc.peer_supports_auth) {
13873                 return (m);
13874         }
13875         /* does the requested chunk require auth? */
13876         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13877                 return (m);
13878         }
13879         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13880         if (m_auth == NULL) {
13881                 /* no mbuf's */
13882                 return (m);
13883         }
13884         /* reserve some space if this will be the first mbuf */
13885         if (m == NULL)
13886                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13887         /* fill in the AUTH chunk details */
13888         auth = mtod(m_auth, struct sctp_auth_chunk *);
13889         bzero(auth, sizeof(*auth));
13890         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13891         auth->ch.chunk_flags = 0;
13892         chunk_len = sizeof(*auth) +
13893             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13894         auth->ch.chunk_length = htons(chunk_len);
13895         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13896         /* key id and hmac digest will be computed and filled in upon send */
13897
13898         /* save the offset where the auth was inserted into the chain */
13899         *offset = 0;
13900         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13901                 *offset += SCTP_BUF_LEN(cn);
13902         }
13903
13904         /* update length and return pointer to the auth chunk */
13905         SCTP_BUF_LEN(m_auth) = chunk_len;
13906         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13907         if (auth_ret != NULL)
13908                 *auth_ret = auth;
13909
13910         return (m);
13911 }
13912
13913 #ifdef INET6
13914 int
13915 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13916 {
13917         struct nd_prefix *pfx = NULL;
13918         struct nd_pfxrouter *pfxrtr = NULL;
13919         struct sockaddr_in6 gw6;
13920
13921         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13922                 return (0);
13923
13924         /* get prefix entry of address */
13925         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13926                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13927                         continue;
13928                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13929                     &src6->sin6_addr, &pfx->ndpr_mask))
13930                         break;
13931         }
13932         /* no prefix entry in the prefix list */
13933         if (pfx == NULL) {
13934                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13935                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13936                 return (0);
13937         }
13938         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13939         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13940
13941         /* search installed gateway from prefix entry */
13942         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13943                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13944                 gw6.sin6_family = AF_INET6;
13945                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13946                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13947                     sizeof(struct in6_addr));
13948                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13949                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13950                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13951                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13952                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13953                     ro->ro_rt->rt_gateway)) {
13954                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13955                         return (1);
13956                 }
13957         }
13958         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13959         return (0);
13960 }
13961
13962 #endif
13963
13964 int
13965 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13966 {
13967 #ifdef INET
13968         struct sockaddr_in *sin, *mask;
13969         struct ifaddr *ifa;
13970         struct in_addr srcnetaddr, gwnetaddr;
13971
13972         if (ro == NULL || ro->ro_rt == NULL ||
13973             sifa->address.sa.sa_family != AF_INET) {
13974                 return (0);
13975         }
13976         ifa = (struct ifaddr *)sifa->ifa;
13977         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13978         sin = (struct sockaddr_in *)&sifa->address.sin;
13979         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13980         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13981         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13982         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13983
13984         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13985         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13986         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13987         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13988         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13989         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13990                 return (1);
13991         }
13992 #endif
13993         return (0);
13994 }