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                         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_keyid;
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                 mat = copy_init;
3718                 while (mat) {
3719                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3720                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3721                         }
3722                         mat = SCTP_BUF_NEXT(mat);
3723                 }
3724         }
3725 #endif
3726         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3727             M_DONTWAIT);
3728         if (copy_initack == NULL) {
3729                 sctp_m_freem(mret);
3730                 sctp_m_freem(copy_init);
3731                 return (NULL);
3732         }
3733 #ifdef SCTP_MBUF_LOGGING
3734         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3735                 struct mbuf *mat;
3736
3737                 mat = copy_initack;
3738                 while (mat) {
3739                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3740                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3741                         }
3742                         mat = SCTP_BUF_NEXT(mat);
3743                 }
3744         }
3745 #endif
3746         /* easy side we just drop it on the end */
3747         ph = mtod(mret, struct sctp_paramhdr *);
3748         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3749             sizeof(struct sctp_paramhdr);
3750         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3751             sizeof(struct sctp_paramhdr));
3752         ph->param_type = htons(SCTP_STATE_COOKIE);
3753         ph->param_length = 0;   /* fill in at the end */
3754         /* Fill in the stc cookie data */
3755         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3756
3757         /* tack the INIT and then the INIT-ACK onto the chain */
3758         cookie_sz = 0;
3759         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3760                 cookie_sz += SCTP_BUF_LEN(m_at);
3761                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3762                         SCTP_BUF_NEXT(m_at) = copy_init;
3763                         break;
3764                 }
3765         }
3766         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3767                 cookie_sz += SCTP_BUF_LEN(m_at);
3768                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3769                         SCTP_BUF_NEXT(m_at) = copy_initack;
3770                         break;
3771                 }
3772         }
3773         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3774                 cookie_sz += SCTP_BUF_LEN(m_at);
3775                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3776                         break;
3777                 }
3778         }
3779         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3780         if (sig == NULL) {
3781                 /* no space, so free the entire chain */
3782                 sctp_m_freem(mret);
3783                 return (NULL);
3784         }
3785         SCTP_BUF_LEN(sig) = 0;
3786         SCTP_BUF_NEXT(m_at) = sig;
3787         sig_offset = 0;
3788         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3789         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3790         *signature = foo;
3791         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3792         cookie_sz += SCTP_SIGNATURE_SIZE;
3793         ph->param_length = htons(cookie_sz);
3794         return (mret);
3795 }
3796
3797
3798 static uint8_t
3799 sctp_get_ect(struct sctp_tcb *stcb)
3800 {
3801         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3802                 return (SCTP_ECT0_BIT);
3803         } else {
3804                 return (0);
3805         }
3806 }
3807
3808 static void
3809 sctp_handle_no_route(struct sctp_tcb *stcb,
3810     struct sctp_nets *net,
3811     int so_locked)
3812 {
3813         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3814
3815         if (net) {
3816                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3817                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3818                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3819                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3820                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3821                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3822                                     stcb,
3823                                     SCTP_FAILED_THRESHOLD,
3824                                     (void *)net,
3825                                     so_locked);
3826                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3827                                 net->dest_state &= ~SCTP_ADDR_PF;
3828                         }
3829                 }
3830                 if (stcb) {
3831                         if (net == stcb->asoc.primary_destination) {
3832                                 /* need a new primary */
3833                                 struct sctp_nets *alt;
3834
3835                                 alt = sctp_find_alternate_net(stcb, net, 0);
3836                                 if (alt != net) {
3837                                         if (stcb->asoc.alternate) {
3838                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3839                                         }
3840                                         stcb->asoc.alternate = alt;
3841                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3842                                         if (net->ro._s_addr) {
3843                                                 sctp_free_ifa(net->ro._s_addr);
3844                                                 net->ro._s_addr = NULL;
3845                                         }
3846                                         net->src_addr_selected = 0;
3847                                 }
3848                         }
3849                 }
3850         }
3851 }
3852
3853 static int
3854 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3855     struct sctp_tcb *stcb,      /* may be NULL */
3856     struct sctp_nets *net,
3857     struct sockaddr *to,
3858     struct mbuf *m,
3859     uint32_t auth_offset,
3860     struct sctp_auth_chunk *auth,
3861     uint16_t auth_keyid,
3862     int nofragment_flag,
3863     int ecn_ok,
3864     int out_of_asoc_ok,
3865     uint16_t src_port,
3866     uint16_t dest_port,
3867     uint32_t v_tag,
3868     uint16_t port,
3869 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3870     int so_locked SCTP_UNUSED,
3871 #else
3872     int so_locked,
3873 #endif
3874     union sctp_sockstore *over_addr,
3875     struct mbuf *init
3876 )
3877 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3878 {
3879         /**
3880          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3881          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3882          * - fill in the HMAC digest of any AUTH chunk in the packet.
3883          * - calculate and fill in the SCTP checksum.
3884          * - prepend an IP address header.
3885          * - if boundall use INADDR_ANY.
3886          * - if boundspecific do source address selection.
3887          * - set fragmentation option for ipV4.
3888          * - On return from IP output, check/adjust mtu size of output
3889          *   interface and smallest_mtu size as well.
3890          */
3891         /* Will need ifdefs around this */
3892         struct mbuf *o_pak;
3893         struct mbuf *newm;
3894         struct sctphdr *sctphdr;
3895         int packet_length;
3896         int ret;
3897         uint32_t vrf_id;
3898         sctp_route_t *ro = NULL;
3899         struct udphdr *udp = NULL;
3900         uint8_t tos_value;
3901
3902 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3903         struct socket *so = NULL;
3904
3905 #endif
3906
3907         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3908                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3909                 sctp_m_freem(m);
3910                 return (EFAULT);
3911         }
3912         if (stcb) {
3913                 vrf_id = stcb->asoc.vrf_id;
3914         } else {
3915                 vrf_id = inp->def_vrf_id;
3916         }
3917
3918         /* fill in the HMAC digest for any AUTH chunk in the packet */
3919         if ((auth != NULL) && (stcb != NULL)) {
3920                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3921         }
3922         if (net) {
3923                 tos_value = net->dscp;
3924         } else if (stcb) {
3925                 tos_value = stcb->asoc.default_dscp;
3926         } else {
3927                 tos_value = inp->sctp_ep.default_dscp;
3928         }
3929
3930         switch (to->sa_family) {
3931 #ifdef INET
3932         case AF_INET:
3933                 {
3934                         struct ip *ip = NULL;
3935                         sctp_route_t iproute;
3936                         int len;
3937
3938                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3939                         if (port) {
3940                                 len += sizeof(struct udphdr);
3941                         }
3942                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3943                         if (newm == NULL) {
3944                                 sctp_m_freem(m);
3945                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3946                                 return (ENOMEM);
3947                         }
3948                         SCTP_ALIGN_TO_END(newm, len);
3949                         SCTP_BUF_LEN(newm) = len;
3950                         SCTP_BUF_NEXT(newm) = m;
3951                         m = newm;
3952                         if (net != NULL) {
3953 #ifdef INVARIANTS
3954                                 if (net->flowidset == 0) {
3955                                         panic("Flow ID not set");
3956                                 }
3957 #endif
3958                                 m->m_pkthdr.flowid = net->flowid;
3959                                 m->m_flags |= M_FLOWID;
3960                         } else {
3961                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3962                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3963                                         m->m_flags |= M_FLOWID;
3964                                 }
3965                         }
3966                         packet_length = sctp_calculate_len(m);
3967                         ip = mtod(m, struct ip *);
3968                         ip->ip_v = IPVERSION;
3969                         ip->ip_hl = (sizeof(struct ip) >> 2);
3970                         if (tos_value == 0) {
3971                                 /*
3972                                  * This means especially, that it is not set
3973                                  * at the SCTP layer. So use the value from
3974                                  * the IP layer.
3975                                  */
3976                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3977                         }
3978                         tos_value &= 0xfc;
3979                         if (ecn_ok) {
3980                                 tos_value |= sctp_get_ect(stcb);
3981                         }
3982                         if ((nofragment_flag) && (port == 0)) {
3983                                 ip->ip_off = IP_DF;
3984                         } else
3985                                 ip->ip_off = 0;
3986
3987                         /* FreeBSD has a function for ip_id's */
3988                         ip->ip_id = ip_newid();
3989
3990                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3991                         ip->ip_len = packet_length;
3992                         ip->ip_tos = tos_value;
3993                         if (port) {
3994                                 ip->ip_p = IPPROTO_UDP;
3995                         } else {
3996                                 ip->ip_p = IPPROTO_SCTP;
3997                         }
3998                         ip->ip_sum = 0;
3999                         if (net == NULL) {
4000                                 ro = &iproute;
4001                                 memset(&iproute, 0, sizeof(iproute));
4002                                 memcpy(&ro->ro_dst, to, to->sa_len);
4003                         } else {
4004                                 ro = (sctp_route_t *) & net->ro;
4005                         }
4006                         /* Now the address selection part */
4007                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4008
4009                         /* call the routine to select the src address */
4010                         if (net && out_of_asoc_ok == 0) {
4011                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4012                                         sctp_free_ifa(net->ro._s_addr);
4013                                         net->ro._s_addr = NULL;
4014                                         net->src_addr_selected = 0;
4015                                         if (ro->ro_rt) {
4016                                                 RTFREE(ro->ro_rt);
4017                                                 ro->ro_rt = NULL;
4018                                         }
4019                                 }
4020                                 if (net->src_addr_selected == 0) {
4021                                         /* Cache the source address */
4022                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4023                                             ro, net, 0,
4024                                             vrf_id);
4025                                         net->src_addr_selected = 1;
4026                                 }
4027                                 if (net->ro._s_addr == NULL) {
4028                                         /* No route to host */
4029                                         net->src_addr_selected = 0;
4030                                         sctp_handle_no_route(stcb, net, so_locked);
4031                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4032                                         sctp_m_freem(m);
4033                                         return (EHOSTUNREACH);
4034                                 }
4035                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4036                         } else {
4037                                 if (over_addr == NULL) {
4038                                         struct sctp_ifa *_lsrc;
4039
4040                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4041                                             net,
4042                                             out_of_asoc_ok,
4043                                             vrf_id);
4044                                         if (_lsrc == NULL) {
4045                                                 sctp_handle_no_route(stcb, net, so_locked);
4046                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4047                                                 sctp_m_freem(m);
4048                                                 return (EHOSTUNREACH);
4049                                         }
4050                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4051                                         sctp_free_ifa(_lsrc);
4052                                 } else {
4053                                         ip->ip_src = over_addr->sin.sin_addr;
4054                                         SCTP_RTALLOC(ro, vrf_id);
4055                                 }
4056                         }
4057                         if (port) {
4058                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4059                                         sctp_handle_no_route(stcb, net, so_locked);
4060                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4061                                         sctp_m_freem(m);
4062                                         return (EHOSTUNREACH);
4063                                 }
4064                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4065                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4066                                 udp->uh_dport = port;
4067                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4068                                 if (V_udp_cksum) {
4069                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4070                                 } else {
4071                                         udp->uh_sum = 0;
4072                                 }
4073                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4074                         } else {
4075                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4076                         }
4077
4078                         sctphdr->src_port = src_port;
4079                         sctphdr->dest_port = dest_port;
4080                         sctphdr->v_tag = v_tag;
4081                         sctphdr->checksum = 0;
4082
4083                         /*
4084                          * If source address selection fails and we find no
4085                          * route then the ip_output should fail as well with
4086                          * a NO_ROUTE_TO_HOST type error. We probably should
4087                          * catch that somewhere and abort the association
4088                          * right away (assuming this is an INIT being sent).
4089                          */
4090                         if (ro->ro_rt == NULL) {
4091                                 /*
4092                                  * src addr selection failed to find a route
4093                                  * (or valid source addr), so we can't get
4094                                  * there from here (yet)!
4095                                  */
4096                                 sctp_handle_no_route(stcb, net, so_locked);
4097                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4098                                 sctp_m_freem(m);
4099                                 return (EHOSTUNREACH);
4100                         }
4101                         if (ro != &iproute) {
4102                                 memcpy(&iproute, ro, sizeof(*ro));
4103                         }
4104                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4105                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4106                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4107                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4108                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4109                             ro->ro_rt);
4110
4111                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4112                                 /* failed to prepend data, give up */
4113                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4114                                 sctp_m_freem(m);
4115                                 return (ENOMEM);
4116                         }
4117 #ifdef  SCTP_PACKET_LOGGING
4118                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4119                                 sctp_packet_log(m, packet_length);
4120 #endif
4121                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4122                         if (port) {
4123 #if defined(SCTP_WITH_NO_CSUM)
4124                                 SCTP_STAT_INCR(sctps_sendnocrc);
4125 #else
4126                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4127                                     (stcb) &&
4128                                     (stcb->asoc.loopback_scope))) {
4129                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4130                                         SCTP_STAT_INCR(sctps_sendswcrc);
4131                                 } else {
4132                                         SCTP_STAT_INCR(sctps_sendnocrc);
4133                                 }
4134 #endif
4135                                 if (V_udp_cksum) {
4136                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4137                                 }
4138                         } else {
4139 #if defined(SCTP_WITH_NO_CSUM)
4140                                 SCTP_STAT_INCR(sctps_sendnocrc);
4141 #else
4142                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4143                                 m->m_pkthdr.csum_data = 0;
4144                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4145 #endif
4146                         }
4147                         /* send it out.  table id is taken from stcb */
4148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4149                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4150                                 so = SCTP_INP_SO(inp);
4151                                 SCTP_SOCKET_UNLOCK(so, 0);
4152                         }
4153 #endif
4154                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4155 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4156                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4157                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4158                                 SCTP_TCB_UNLOCK(stcb);
4159                                 SCTP_SOCKET_LOCK(so, 0);
4160                                 SCTP_TCB_LOCK(stcb);
4161                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4162                         }
4163 #endif
4164                         SCTP_STAT_INCR(sctps_sendpackets);
4165                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4166                         if (ret)
4167                                 SCTP_STAT_INCR(sctps_senderrors);
4168
4169                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4170                         if (net == NULL) {
4171                                 /* free tempy routes */
4172                                 if (ro->ro_rt) {
4173                                         RTFREE(ro->ro_rt);
4174                                         ro->ro_rt = NULL;
4175                                 }
4176                         } else {
4177                                 /*
4178                                  * PMTU check versus smallest asoc MTU goes
4179                                  * here
4180                                  */
4181                                 if ((ro->ro_rt != NULL) &&
4182                                     (net->ro._s_addr)) {
4183                                         uint32_t mtu;
4184
4185                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4186                                         if (net->port) {
4187                                                 mtu -= sizeof(struct udphdr);
4188                                         }
4189                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4190                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4191                                                 net->mtu = mtu;
4192                                         }
4193                                 } else if (ro->ro_rt == NULL) {
4194                                         /* route was freed */
4195                                         if (net->ro._s_addr &&
4196                                             net->src_addr_selected) {
4197                                                 sctp_free_ifa(net->ro._s_addr);
4198                                                 net->ro._s_addr = NULL;
4199                                         }
4200                                         net->src_addr_selected = 0;
4201                                 }
4202                         }
4203                         return (ret);
4204                 }
4205 #endif
4206 #ifdef INET6
4207         case AF_INET6:
4208                 {
4209                         uint32_t flowlabel, flowinfo;
4210                         struct ip6_hdr *ip6h;
4211                         struct route_in6 ip6route;
4212                         struct ifnet *ifp;
4213                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4214                         int prev_scope = 0;
4215                         struct sockaddr_in6 lsa6_storage;
4216                         int error;
4217                         u_short prev_port = 0;
4218                         int len;
4219
4220                         if (net) {
4221                                 flowlabel = net->flowlabel;
4222                         } else if (stcb) {
4223                                 flowlabel = stcb->asoc.default_flowlabel;
4224                         } else {
4225                                 flowlabel = inp->sctp_ep.default_flowlabel;
4226                         }
4227                         if (flowlabel == 0) {
4228                                 /*
4229                                  * This means especially, that it is not set
4230                                  * at the SCTP layer. So use the value from
4231                                  * the IP layer.
4232                                  */
4233                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4234                         }
4235                         flowlabel &= 0x000fffff;
4236                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4237                         if (port) {
4238                                 len += sizeof(struct udphdr);
4239                         }
4240                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4241                         if (newm == NULL) {
4242                                 sctp_m_freem(m);
4243                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4244                                 return (ENOMEM);
4245                         }
4246                         SCTP_ALIGN_TO_END(newm, len);
4247                         SCTP_BUF_LEN(newm) = len;
4248                         SCTP_BUF_NEXT(newm) = m;
4249                         m = newm;
4250                         if (net != NULL) {
4251 #ifdef INVARIANTS
4252                                 if (net->flowidset == 0) {
4253                                         panic("Flow ID not set");
4254                                 }
4255 #endif
4256                                 m->m_pkthdr.flowid = net->flowid;
4257                                 m->m_flags |= M_FLOWID;
4258                         } else {
4259                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
4260                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
4261                                         m->m_flags |= M_FLOWID;
4262                                 }
4263                         }
4264                         packet_length = sctp_calculate_len(m);
4265
4266                         ip6h = mtod(m, struct ip6_hdr *);
4267                         /* protect *sin6 from overwrite */
4268                         sin6 = (struct sockaddr_in6 *)to;
4269                         tmp = *sin6;
4270                         sin6 = &tmp;
4271
4272                         /* KAME hack: embed scopeid */
4273                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4274                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4275                                 return (EINVAL);
4276                         }
4277                         if (net == NULL) {
4278                                 memset(&ip6route, 0, sizeof(ip6route));
4279                                 ro = (sctp_route_t *) & ip6route;
4280                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4281                         } else {
4282                                 ro = (sctp_route_t *) & net->ro;
4283                         }
4284                         /*
4285                          * We assume here that inp_flow is in host byte
4286                          * order within the TCB!
4287                          */
4288                         if (tos_value == 0) {
4289                                 /*
4290                                  * This means especially, that it is not set
4291                                  * at the SCTP layer. So use the value from
4292                                  * the IP layer.
4293                                  */
4294                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4295                         }
4296                         tos_value &= 0xfc;
4297                         if (ecn_ok) {
4298                                 tos_value |= sctp_get_ect(stcb);
4299                         }
4300                         flowinfo = 0x06;
4301                         flowinfo <<= 8;
4302                         flowinfo |= tos_value;
4303                         flowinfo <<= 20;
4304                         flowinfo |= flowlabel;
4305                         ip6h->ip6_flow = htonl(flowinfo);
4306                         if (port) {
4307                                 ip6h->ip6_nxt = IPPROTO_UDP;
4308                         } else {
4309                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4310                         }
4311                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4312                         ip6h->ip6_dst = sin6->sin6_addr;
4313
4314                         /*
4315                          * Add SRC address selection here: we can only reuse
4316                          * to a limited degree the kame src-addr-sel, since
4317                          * we can try their selection but it may not be
4318                          * bound.
4319                          */
4320                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4321                         lsa6_tmp.sin6_family = AF_INET6;
4322                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4323                         lsa6 = &lsa6_tmp;
4324                         if (net && out_of_asoc_ok == 0) {
4325                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4326                                         sctp_free_ifa(net->ro._s_addr);
4327                                         net->ro._s_addr = NULL;
4328                                         net->src_addr_selected = 0;
4329                                         if (ro->ro_rt) {
4330                                                 RTFREE(ro->ro_rt);
4331                                                 ro->ro_rt = NULL;
4332                                         }
4333                                 }
4334                                 if (net->src_addr_selected == 0) {
4335                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4336                                         /* KAME hack: embed scopeid */
4337                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4338                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4339                                                 return (EINVAL);
4340                                         }
4341                                         /* Cache the source address */
4342                                         net->ro._s_addr = sctp_source_address_selection(inp,
4343                                             stcb,
4344                                             ro,
4345                                             net,
4346                                             0,
4347                                             vrf_id);
4348                                         (void)sa6_recoverscope(sin6);
4349                                         net->src_addr_selected = 1;
4350                                 }
4351                                 if (net->ro._s_addr == NULL) {
4352                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4353                                         net->src_addr_selected = 0;
4354                                         sctp_handle_no_route(stcb, net, so_locked);
4355                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4356                                         sctp_m_freem(m);
4357                                         return (EHOSTUNREACH);
4358                                 }
4359                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4360                         } else {
4361                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4362                                 /* KAME hack: embed scopeid */
4363                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4364                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4365                                         return (EINVAL);
4366                                 }
4367                                 if (over_addr == NULL) {
4368                                         struct sctp_ifa *_lsrc;
4369
4370                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4371                                             net,
4372                                             out_of_asoc_ok,
4373                                             vrf_id);
4374                                         if (_lsrc == NULL) {
4375                                                 sctp_handle_no_route(stcb, net, so_locked);
4376                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4377                                                 sctp_m_freem(m);
4378                                                 return (EHOSTUNREACH);
4379                                         }
4380                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4381                                         sctp_free_ifa(_lsrc);
4382                                 } else {
4383                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4384                                         SCTP_RTALLOC(ro, vrf_id);
4385                                 }
4386                                 (void)sa6_recoverscope(sin6);
4387                         }
4388                         lsa6->sin6_port = inp->sctp_lport;
4389
4390                         if (ro->ro_rt == NULL) {
4391                                 /*
4392                                  * src addr selection failed to find a route
4393                                  * (or valid source addr), so we can't get
4394                                  * there from here!
4395                                  */
4396                                 sctp_handle_no_route(stcb, net, so_locked);
4397                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4398                                 sctp_m_freem(m);
4399                                 return (EHOSTUNREACH);
4400                         }
4401                         /*
4402                          * XXX: sa6 may not have a valid sin6_scope_id in
4403                          * the non-SCOPEDROUTING case.
4404                          */
4405                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4406                         lsa6_storage.sin6_family = AF_INET6;
4407                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4408                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4409                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4410                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4411                                 sctp_m_freem(m);
4412                                 return (error);
4413                         }
4414                         /* XXX */
4415                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4416                         lsa6_storage.sin6_port = inp->sctp_lport;
4417                         lsa6 = &lsa6_storage;
4418                         ip6h->ip6_src = lsa6->sin6_addr;
4419
4420                         if (port) {
4421                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4422                                         sctp_handle_no_route(stcb, net, so_locked);
4423                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4424                                         sctp_m_freem(m);
4425                                         return (EHOSTUNREACH);
4426                                 }
4427                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4428                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4429                                 udp->uh_dport = port;
4430                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4431                                 udp->uh_sum = 0;
4432                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4433                         } else {
4434                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4435                         }
4436
4437                         sctphdr->src_port = src_port;
4438                         sctphdr->dest_port = dest_port;
4439                         sctphdr->v_tag = v_tag;
4440                         sctphdr->checksum = 0;
4441
4442                         /*
4443                          * We set the hop limit now since there is a good
4444                          * chance that our ro pointer is now filled
4445                          */
4446                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4447                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4448
4449 #ifdef SCTP_DEBUG
4450                         /* Copy to be sure something bad is not happening */
4451                         sin6->sin6_addr = ip6h->ip6_dst;
4452                         lsa6->sin6_addr = ip6h->ip6_src;
4453 #endif
4454
4455                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4456                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4457                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4458                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4459                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4460                         if (net) {
4461                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4462                                 /*
4463                                  * preserve the port and scope for link
4464                                  * local send
4465                                  */
4466                                 prev_scope = sin6->sin6_scope_id;
4467                                 prev_port = sin6->sin6_port;
4468                         }
4469                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4470                                 /* failed to prepend data, give up */
4471                                 sctp_m_freem(m);
4472                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4473                                 return (ENOMEM);
4474                         }
4475 #ifdef  SCTP_PACKET_LOGGING
4476                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4477                                 sctp_packet_log(m, packet_length);
4478 #endif
4479                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4480                         if (port) {
4481 #if defined(SCTP_WITH_NO_CSUM)
4482                                 SCTP_STAT_INCR(sctps_sendnocrc);
4483 #else
4484                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4485                                     (stcb) &&
4486                                     (stcb->asoc.loopback_scope))) {
4487                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4488                                         SCTP_STAT_INCR(sctps_sendswcrc);
4489                                 } else {
4490                                         SCTP_STAT_INCR(sctps_sendnocrc);
4491                                 }
4492 #endif
4493                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4494                                         udp->uh_sum = 0xffff;
4495                                 }
4496                         } else {
4497 #if defined(SCTP_WITH_NO_CSUM)
4498                                 SCTP_STAT_INCR(sctps_sendnocrc);
4499 #else
4500                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4501                                 m->m_pkthdr.csum_data = 0;
4502                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4503 #endif
4504                         }
4505                         /* send it out. table id is taken from stcb */
4506 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4507                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4508                                 so = SCTP_INP_SO(inp);
4509                                 SCTP_SOCKET_UNLOCK(so, 0);
4510                         }
4511 #endif
4512                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4513 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4514                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4515                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4516                                 SCTP_TCB_UNLOCK(stcb);
4517                                 SCTP_SOCKET_LOCK(so, 0);
4518                                 SCTP_TCB_LOCK(stcb);
4519                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4520                         }
4521 #endif
4522                         if (net) {
4523                                 /* for link local this must be done */
4524                                 sin6->sin6_scope_id = prev_scope;
4525                                 sin6->sin6_port = prev_port;
4526                         }
4527                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4528                         SCTP_STAT_INCR(sctps_sendpackets);
4529                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4530                         if (ret) {
4531                                 SCTP_STAT_INCR(sctps_senderrors);
4532                         }
4533                         if (net == NULL) {
4534                                 /* Now if we had a temp route free it */
4535                                 if (ro->ro_rt) {
4536                                         RTFREE(ro->ro_rt);
4537                                 }
4538                         } else {
4539                                 /*
4540                                  * PMTU check versus smallest asoc MTU goes
4541                                  * here
4542                                  */
4543                                 if (ro->ro_rt == NULL) {
4544                                         /* Route was freed */
4545                                         if (net->ro._s_addr &&
4546                                             net->src_addr_selected) {
4547                                                 sctp_free_ifa(net->ro._s_addr);
4548                                                 net->ro._s_addr = NULL;
4549                                         }
4550                                         net->src_addr_selected = 0;
4551                                 }
4552                                 if ((ro->ro_rt != NULL) &&
4553                                     (net->ro._s_addr)) {
4554                                         uint32_t mtu;
4555
4556                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4557                                         if (mtu &&
4558                                             (stcb->asoc.smallest_mtu > mtu)) {
4559                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4560                                                 net->mtu = mtu;
4561                                                 if (net->port) {
4562                                                         net->mtu -= sizeof(struct udphdr);
4563                                                 }
4564                                         }
4565                                 } else if (ifp) {
4566                                         if (ND_IFINFO(ifp)->linkmtu &&
4567                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4568                                                 sctp_mtu_size_reset(inp,
4569                                                     &stcb->asoc,
4570                                                     ND_IFINFO(ifp)->linkmtu);
4571                                         }
4572                                 }
4573                         }
4574                         return (ret);
4575                 }
4576 #endif
4577         default:
4578                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4579                     ((struct sockaddr *)to)->sa_family);
4580                 sctp_m_freem(m);
4581                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4582                 return (EFAULT);
4583         }
4584 }
4585
4586
4587 void
4588 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4589 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4590     SCTP_UNUSED
4591 #endif
4592 )
4593 {
4594         struct mbuf *m, *m_at, *mp_last;
4595         struct sctp_nets *net;
4596         struct sctp_init_chunk *init;
4597         struct sctp_supported_addr_param *sup_addr;
4598         struct sctp_adaptation_layer_indication *ali;
4599         struct sctp_ecn_supported_param *ecn;
4600         struct sctp_prsctp_supported_param *prsctp;
4601         struct sctp_supported_chunk_types_param *pr_supported;
4602         int cnt_inits_to = 0;
4603         int padval, ret;
4604         int num_ext;
4605         int p_len;
4606
4607         /* INIT's always go to the primary (and usually ONLY address) */
4608         mp_last = NULL;
4609         net = stcb->asoc.primary_destination;
4610         if (net == NULL) {
4611                 net = TAILQ_FIRST(&stcb->asoc.nets);
4612                 if (net == NULL) {
4613                         /* TSNH */
4614                         return;
4615                 }
4616                 /* we confirm any address we send an INIT to */
4617                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4618                 (void)sctp_set_primary_addr(stcb, NULL, net);
4619         } else {
4620                 /* we confirm any address we send an INIT to */
4621                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4622         }
4623         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4624 #ifdef INET6
4625         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4626                 /*
4627                  * special hook, if we are sending to link local it will not
4628                  * show up in our private address count.
4629                  */
4630                 struct sockaddr_in6 *sin6l;
4631
4632                 sin6l = &net->ro._l_addr.sin6;
4633                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4634                         cnt_inits_to = 1;
4635         }
4636 #endif
4637         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4638                 /* This case should not happen */
4639                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4640                 return;
4641         }
4642         /* start the INIT timer */
4643         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4644
4645         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4646         if (m == NULL) {
4647                 /* No memory, INIT timer will re-attempt. */
4648                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4649                 return;
4650         }
4651         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4652         /*
4653          * assume peer supports asconf in order to be able to queue local
4654          * address changes while an INIT is in flight and before the assoc
4655          * is established.
4656          */
4657         stcb->asoc.peer_supports_asconf = 1;
4658         /* Now lets put the SCTP header in place */
4659         init = mtod(m, struct sctp_init_chunk *);
4660         /* now the chunk header */
4661         init->ch.chunk_type = SCTP_INITIATION;
4662         init->ch.chunk_flags = 0;
4663         /* fill in later from mbuf we build */
4664         init->ch.chunk_length = 0;
4665         /* place in my tag */
4666         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4667         /* set up some of the credits. */
4668         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4669             SCTP_MINIMAL_RWND));
4670
4671         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4672         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4673         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4674         /* now the address restriction */
4675         /* XXX Should we take the address family of the socket into account? */
4676         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4677             sizeof(*init));
4678         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4679 #ifdef INET6
4680 #ifdef INET
4681         /* we support 2 types: IPv4/IPv6 */
4682         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4683         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4684         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4685 #else
4686         /* we support 1 type: IPv6 */
4687         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4688         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4689         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4690 #endif
4691 #else
4692         /* we support 1 type: IPv4 */
4693         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4694         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4695         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4696 #endif
4697         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4698         /* adaptation layer indication parameter */
4699         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4700         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4701         ali->ph.param_length = htons(sizeof(*ali));
4702         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4703         SCTP_BUF_LEN(m) += sizeof(*ali);
4704         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4705
4706         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4707                 /* Add NAT friendly parameter */
4708                 struct sctp_paramhdr *ph;
4709
4710                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4711                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4712                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4713                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4714                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4715         }
4716         /* now any cookie time extensions */
4717         if (stcb->asoc.cookie_preserve_req) {
4718                 struct sctp_cookie_perserve_param *cookie_preserve;
4719
4720                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4721                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4722                 cookie_preserve->ph.param_length = htons(
4723                     sizeof(*cookie_preserve));
4724                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4725                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4726                 ecn = (struct sctp_ecn_supported_param *)(
4727                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4728                 stcb->asoc.cookie_preserve_req = 0;
4729         }
4730         /* ECN parameter */
4731         if (stcb->asoc.ecn_allowed == 1) {
4732                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4733                 ecn->ph.param_length = htons(sizeof(*ecn));
4734                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4735                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4736                     sizeof(*ecn));
4737         } else {
4738                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4739         }
4740         /* And now tell the peer we do pr-sctp */
4741         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4742         prsctp->ph.param_length = htons(sizeof(*prsctp));
4743         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4744
4745         /* And now tell the peer we do all the extensions */
4746         pr_supported = (struct sctp_supported_chunk_types_param *)
4747             ((caddr_t)prsctp + sizeof(*prsctp));
4748         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4749         num_ext = 0;
4750         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4751         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4752         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4753         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4754         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4755         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4756                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4757         }
4758         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4759                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4760         }
4761         p_len = sizeof(*pr_supported) + num_ext;
4762         pr_supported->ph.param_length = htons(p_len);
4763         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4764         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4765
4766
4767         /* add authentication parameters */
4768         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4769                 struct sctp_auth_random *randp;
4770                 struct sctp_auth_hmac_algo *hmacs;
4771                 struct sctp_auth_chunk_list *chunks;
4772
4773                 /* attach RANDOM parameter, if available */
4774                 if (stcb->asoc.authinfo.random != NULL) {
4775                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4776                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4777                         /* random key already contains the header */
4778                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4779                         /* zero out any padding required */
4780                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4781                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4782                 }
4783                 /* add HMAC_ALGO parameter */
4784                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4785                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4786                     (uint8_t *) hmacs->hmac_ids);
4787                 if (p_len > 0) {
4788                         p_len += sizeof(*hmacs);
4789                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4790                         hmacs->ph.param_length = htons(p_len);
4791                         /* zero out any padding required */
4792                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4793                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4794                 }
4795                 /* add CHUNKS parameter */
4796                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4797                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4798                     chunks->chunk_types);
4799                 if (p_len > 0) {
4800                         p_len += sizeof(*chunks);
4801                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4802                         chunks->ph.param_length = htons(p_len);
4803                         /* zero out any padding required */
4804                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4805                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4806                 }
4807         }
4808         /* now the addresses */
4809         {
4810                 struct sctp_scoping scp;
4811
4812                 /*
4813                  * To optimize this we could put the scoping stuff into a
4814                  * structure and remove the individual uint8's from the
4815                  * assoc structure. Then we could just sifa in the address
4816                  * within the stcb. But for now this is a quick hack to get
4817                  * the address stuff teased apart.
4818                  */
4819
4820                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4821                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4822                 scp.loopback_scope = stcb->asoc.loopback_scope;
4823                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4824                 scp.local_scope = stcb->asoc.local_scope;
4825                 scp.site_scope = stcb->asoc.site_scope;
4826
4827                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4828         }
4829
4830         /* calulate the size and update pkt header and chunk header */
4831         p_len = 0;
4832         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4833                 if (SCTP_BUF_NEXT(m_at) == NULL)
4834                         mp_last = m_at;
4835                 p_len += SCTP_BUF_LEN(m_at);
4836         }
4837         init->ch.chunk_length = htons(p_len);
4838         /*
4839          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4840          * here since the timer will drive a retranmission.
4841          */
4842
4843         /* I don't expect this to execute but we will be safe here */
4844         padval = p_len % 4;
4845         if ((padval) && (mp_last)) {
4846                 /*
4847                  * The compiler worries that mp_last may not be set even
4848                  * though I think it is impossible :-> however we add
4849                  * mp_last here just in case.
4850                  */
4851                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4852                 if (ret) {
4853                         /* Houston we have a problem, no space */
4854                         sctp_m_freem(m);
4855                         return;
4856                 }
4857         }
4858         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4859         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4860             (struct sockaddr *)&net->ro._l_addr,
4861             m, 0, NULL, 0, 0, 0, 0,
4862             inp->sctp_lport, stcb->rport, htonl(0),
4863             net->port, so_locked, NULL, NULL);
4864         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4865         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4866         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4867 }
4868
4869 struct mbuf *
4870 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4871     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4872 {
4873         /*
4874          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4875          * being equal to the beginning of the params i.e. (iphlen +
4876          * sizeof(struct sctp_init_msg) parse through the parameters to the
4877          * end of the mbuf verifying that all parameters are known.
4878          *
4879          * For unknown parameters build and return a mbuf with
4880          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4881          * processing this chunk stop, and set *abort_processing to 1.
4882          *
4883          * By having param_offset be pre-set to where parameters begin it is
4884          * hoped that this routine may be reused in the future by new
4885          * features.
4886          */
4887         struct sctp_paramhdr *phdr, params;
4888
4889         struct mbuf *mat, *op_err;
4890         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4891         int at, limit, pad_needed;
4892         uint16_t ptype, plen, padded_size;
4893         int err_at;
4894
4895         *abort_processing = 0;
4896         mat = in_initpkt;
4897         err_at = 0;
4898         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4899         at = param_offset;
4900         op_err = NULL;
4901         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4902         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4903         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4904                 ptype = ntohs(phdr->param_type);
4905                 plen = ntohs(phdr->param_length);
4906                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4907                         /* wacked parameter */
4908                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4909                         goto invalid_size;
4910                 }
4911                 limit -= SCTP_SIZE32(plen);
4912                 /*-
4913                  * All parameters for all chunks that we know/understand are
4914                  * listed here. We process them other places and make
4915                  * appropriate stop actions per the upper bits. However this
4916                  * is the generic routine processor's can call to get back
4917                  * an operr.. to either incorporate (init-ack) or send.
4918                  */
4919                 padded_size = SCTP_SIZE32(plen);
4920                 switch (ptype) {
4921                         /* Param's with variable size */
4922                 case SCTP_HEARTBEAT_INFO:
4923                 case SCTP_STATE_COOKIE:
4924                 case SCTP_UNRECOG_PARAM:
4925                 case SCTP_ERROR_CAUSE_IND:
4926                         /* ok skip fwd */
4927                         at += padded_size;
4928                         break;
4929                         /* Param's with variable size within a range */
4930                 case SCTP_CHUNK_LIST:
4931                 case SCTP_SUPPORTED_CHUNK_EXT:
4932                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4933                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4934                                 goto invalid_size;
4935                         }
4936                         at += padded_size;
4937                         break;
4938                 case SCTP_SUPPORTED_ADDRTYPE:
4939                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4941                                 goto invalid_size;
4942                         }
4943                         at += padded_size;
4944                         break;
4945                 case SCTP_RANDOM:
4946                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4947                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4948                                 goto invalid_size;
4949                         }
4950                         at += padded_size;
4951                         break;
4952                 case SCTP_SET_PRIM_ADDR:
4953                 case SCTP_DEL_IP_ADDRESS:
4954                 case SCTP_ADD_IP_ADDRESS:
4955                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4956                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4957                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4958                                 goto invalid_size;
4959                         }
4960                         at += padded_size;
4961                         break;
4962                         /* Param's with a fixed size */
4963                 case SCTP_IPV4_ADDRESS:
4964                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4965                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4966                                 goto invalid_size;
4967                         }
4968                         at += padded_size;
4969                         break;
4970                 case SCTP_IPV6_ADDRESS:
4971                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4972                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4973                                 goto invalid_size;
4974                         }
4975                         at += padded_size;
4976                         break;
4977                 case SCTP_COOKIE_PRESERVE:
4978                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4979                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4980                                 goto invalid_size;
4981                         }
4982                         at += padded_size;
4983                         break;
4984                 case SCTP_HAS_NAT_SUPPORT:
4985                         *nat_friendly = 1;
4986                         /* fall through */
4987                 case SCTP_PRSCTP_SUPPORTED:
4988
4989                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4990                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4991                                 goto invalid_size;
4992                         }
4993                         at += padded_size;
4994                         break;
4995                 case SCTP_ECN_CAPABLE:
4996                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4997                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4998                                 goto invalid_size;
4999                         }
5000                         at += padded_size;
5001                         break;
5002                 case SCTP_ULP_ADAPTATION:
5003                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5004                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5005                                 goto invalid_size;
5006                         }
5007                         at += padded_size;
5008                         break;
5009                 case SCTP_SUCCESS_REPORT:
5010                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5011                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5012                                 goto invalid_size;
5013                         }
5014                         at += padded_size;
5015                         break;
5016                 case SCTP_HOSTNAME_ADDRESS:
5017                         {
5018                                 /* We can NOT handle HOST NAME addresses!! */
5019                                 int l_len;
5020
5021                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5022                                 *abort_processing = 1;
5023                                 if (op_err == NULL) {
5024                                         /* Ok need to try to get a mbuf */
5025 #ifdef INET6
5026                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5027 #else
5028                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5029 #endif
5030                                         l_len += plen;
5031                                         l_len += sizeof(struct sctp_paramhdr);
5032                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5033                                         if (op_err) {
5034                                                 SCTP_BUF_LEN(op_err) = 0;
5035                                                 /*
5036                                                  * pre-reserve space for ip
5037                                                  * and sctp header  and
5038                                                  * chunk hdr
5039                                                  */
5040 #ifdef INET6
5041                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5042 #else
5043                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5044 #endif
5045                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5046                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5047                                         }
5048                                 }
5049                                 if (op_err) {
5050                                         /* If we have space */
5051                                         struct sctp_paramhdr s;
5052
5053                                         if (err_at % 4) {
5054                                                 uint32_t cpthis = 0;
5055
5056                                                 pad_needed = 4 - (err_at % 4);
5057                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5058                                                 err_at += pad_needed;
5059                                         }
5060                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5061                                         s.param_length = htons(sizeof(s) + plen);
5062                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5063                                         err_at += sizeof(s);
5064                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5065                                         if (phdr == NULL) {
5066                                                 sctp_m_freem(op_err);
5067                                                 /*
5068                                                  * we are out of memory but
5069                                                  * we still need to have a
5070                                                  * look at what to do (the
5071                                                  * system is in trouble
5072                                                  * though).
5073                                                  */
5074                                                 return (NULL);
5075                                         }
5076                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5077                                 }
5078                                 return (op_err);
5079                                 break;
5080                         }
5081                 default:
5082                         /*
5083                          * we do not recognize the parameter figure out what
5084                          * we do.
5085                          */
5086                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5087                         if ((ptype & 0x4000) == 0x4000) {
5088                                 /* Report bit is set?? */
5089                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5090                                 if (op_err == NULL) {
5091                                         int l_len;
5092
5093                                         /* Ok need to try to get an mbuf */
5094 #ifdef INET6
5095                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5096 #else
5097                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5098 #endif
5099                                         l_len += plen;
5100                                         l_len += sizeof(struct sctp_paramhdr);
5101                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5102                                         if (op_err) {
5103                                                 SCTP_BUF_LEN(op_err) = 0;
5104 #ifdef INET6
5105                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5106 #else
5107                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5108 #endif
5109                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5110                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5111                                         }
5112                                 }
5113                                 if (op_err) {
5114                                         /* If we have space */
5115                                         struct sctp_paramhdr s;
5116
5117                                         if (err_at % 4) {
5118                                                 uint32_t cpthis = 0;
5119
5120                                                 pad_needed = 4 - (err_at % 4);
5121                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5122                                                 err_at += pad_needed;
5123                                         }
5124                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5125                                         s.param_length = htons(sizeof(s) + plen);
5126                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5127                                         err_at += sizeof(s);
5128                                         if (plen > sizeof(tempbuf)) {
5129                                                 plen = sizeof(tempbuf);
5130                                         }
5131                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5132                                         if (phdr == NULL) {
5133                                                 sctp_m_freem(op_err);
5134                                                 /*
5135                                                  * we are out of memory but
5136                                                  * we still need to have a
5137                                                  * look at what to do (the
5138                                                  * system is in trouble
5139                                                  * though).
5140                                                  */
5141                                                 op_err = NULL;
5142                                                 goto more_processing;
5143                                         }
5144                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5145                                         err_at += plen;
5146                                 }
5147                         }
5148         more_processing:
5149                         if ((ptype & 0x8000) == 0x0000) {
5150                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5151                                 return (op_err);
5152                         } else {
5153                                 /* skip this chunk and continue processing */
5154                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5155                                 at += SCTP_SIZE32(plen);
5156                         }
5157                         break;
5158
5159                 }
5160                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5161         }
5162         return (op_err);
5163 invalid_size:
5164         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5165         *abort_processing = 1;
5166         if ((op_err == NULL) && phdr) {
5167                 int l_len;
5168
5169 #ifdef INET6
5170                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5171 #else
5172                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5173 #endif
5174                 l_len += (2 * sizeof(struct sctp_paramhdr));
5175                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5176                 if (op_err) {
5177                         SCTP_BUF_LEN(op_err) = 0;
5178 #ifdef INET6
5179                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5180 #else
5181                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5182 #endif
5183                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5184                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5185                 }
5186         }
5187         if ((op_err) && phdr) {
5188                 struct sctp_paramhdr s;
5189
5190                 if (err_at % 4) {
5191                         uint32_t cpthis = 0;
5192
5193                         pad_needed = 4 - (err_at % 4);
5194                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5195                         err_at += pad_needed;
5196                 }
5197                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5198                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5199                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5200                 err_at += sizeof(s);
5201                 /* Only copy back the p-hdr that caused the issue */
5202                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5203         }
5204         return (op_err);
5205 }
5206
5207 static int
5208 sctp_are_there_new_addresses(struct sctp_association *asoc,
5209     struct mbuf *in_initpkt, int offset)
5210 {
5211         /*
5212          * Given a INIT packet, look through the packet to verify that there
5213          * are NO new addresses. As we go through the parameters add reports
5214          * of any un-understood parameters that require an error.  Also we
5215          * must return (1) to drop the packet if we see a un-understood
5216          * parameter that tells us to drop the chunk.
5217          */
5218         struct sockaddr *sa_touse;
5219         struct sockaddr *sa;
5220         struct sctp_paramhdr *phdr, params;
5221         uint16_t ptype, plen;
5222         uint8_t fnd;
5223         struct sctp_nets *net;
5224         struct ip *iph;
5225
5226 #ifdef INET
5227         struct sockaddr_in sin4, *sa4;
5228
5229 #endif
5230 #ifdef INET6
5231         struct sockaddr_in6 sin6, *sa6;
5232         struct ip6_hdr *ip6h;
5233
5234 #endif
5235
5236 #ifdef INET
5237         memset(&sin4, 0, sizeof(sin4));
5238         sin4.sin_family = AF_INET;
5239         sin4.sin_len = sizeof(sin4);
5240 #endif
5241 #ifdef INET6
5242         memset(&sin6, 0, sizeof(sin6));
5243         sin6.sin6_family = AF_INET6;
5244         sin6.sin6_len = sizeof(sin6);
5245 #endif
5246         sa_touse = NULL;
5247         /* First what about the src address of the pkt ? */
5248         iph = mtod(in_initpkt, struct ip *);
5249         switch (iph->ip_v) {
5250 #ifdef INET
5251         case IPVERSION:
5252                 /* source addr is IPv4 */
5253                 sin4.sin_addr = iph->ip_src;
5254                 sa_touse = (struct sockaddr *)&sin4;
5255                 break;
5256 #endif
5257 #ifdef INET6
5258         case IPV6_VERSION >> 4:
5259                 /* source addr is IPv6 */
5260                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5261                 sin6.sin6_addr = ip6h->ip6_src;
5262                 sa_touse = (struct sockaddr *)&sin6;
5263                 break;
5264 #endif
5265         default:
5266                 return (1);
5267         }
5268
5269         fnd = 0;
5270         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5271                 sa = (struct sockaddr *)&net->ro._l_addr;
5272                 if (sa->sa_family == sa_touse->sa_family) {
5273 #ifdef INET
5274                         if (sa->sa_family == AF_INET) {
5275                                 sa4 = (struct sockaddr_in *)sa;
5276                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5277                                         fnd = 1;
5278                                         break;
5279                                 }
5280                         }
5281 #endif
5282 #ifdef INET6
5283                         if (sa->sa_family == AF_INET6) {
5284                                 sa6 = (struct sockaddr_in6 *)sa;
5285                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5286                                         fnd = 1;
5287                                         break;
5288                                 }
5289                         }
5290 #endif
5291                 }
5292         }
5293         if (fnd == 0) {
5294                 /* New address added! no need to look futher. */
5295                 return (1);
5296         }
5297         /* Ok so far lets munge through the rest of the packet */
5298         offset += sizeof(struct sctp_init_chunk);
5299         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5300         while (phdr) {
5301                 sa_touse = NULL;
5302                 ptype = ntohs(phdr->param_type);
5303                 plen = ntohs(phdr->param_length);
5304                 switch (ptype) {
5305 #ifdef INET
5306                 case SCTP_IPV4_ADDRESS:
5307                         {
5308                                 struct sctp_ipv4addr_param *p4, p4_buf;
5309
5310                                 phdr = sctp_get_next_param(in_initpkt, offset,
5311                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5312                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5313                                     phdr == NULL) {
5314                                         return (1);
5315                                 }
5316                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5317                                 sin4.sin_addr.s_addr = p4->addr;
5318                                 sa_touse = (struct sockaddr *)&sin4;
5319                                 break;
5320                         }
5321 #endif
5322 #ifdef INET6
5323                 case SCTP_IPV6_ADDRESS:
5324                         {
5325                                 struct sctp_ipv6addr_param *p6, p6_buf;
5326
5327                                 phdr = sctp_get_next_param(in_initpkt, offset,
5328                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5329                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5330                                     phdr == NULL) {
5331                                         return (1);
5332                                 }
5333                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5334                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5335                                     sizeof(p6->addr));
5336                                 sa_touse = (struct sockaddr *)&sin6;
5337                                 break;
5338                         }
5339 #endif
5340                 default:
5341                         sa_touse = NULL;
5342                         break;
5343                 }
5344                 if (sa_touse) {
5345                         /* ok, sa_touse points to one to check */
5346                         fnd = 0;
5347                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5348                                 sa = (struct sockaddr *)&net->ro._l_addr;
5349                                 if (sa->sa_family != sa_touse->sa_family) {
5350                                         continue;
5351                                 }
5352 #ifdef INET
5353                                 if (sa->sa_family == AF_INET) {
5354                                         sa4 = (struct sockaddr_in *)sa;
5355                                         if (sa4->sin_addr.s_addr ==
5356                                             sin4.sin_addr.s_addr) {
5357                                                 fnd = 1;
5358                                                 break;
5359                                         }
5360                                 }
5361 #endif
5362 #ifdef INET6
5363                                 if (sa->sa_family == AF_INET6) {
5364                                         sa6 = (struct sockaddr_in6 *)sa;
5365                                         if (SCTP6_ARE_ADDR_EQUAL(
5366                                             sa6, &sin6)) {
5367                                                 fnd = 1;
5368                                                 break;
5369                                         }
5370                                 }
5371 #endif
5372                         }
5373                         if (!fnd) {
5374                                 /* New addr added! no need to look further */
5375                                 return (1);
5376                         }
5377                 }
5378                 offset += SCTP_SIZE32(plen);
5379                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5380         }
5381         return (0);
5382 }
5383
5384 /*
5385  * Given a MBUF chain that was sent into us containing an INIT. Build a
5386  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5387  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5388  * message (i.e. the struct sctp_init_msg).
5389  */
5390 void
5391 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5392     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
5393     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5394 {
5395         struct sctp_association *asoc;
5396         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5397         struct sctp_init_ack_chunk *initack;
5398         struct sctp_adaptation_layer_indication *ali;
5399         struct sctp_ecn_supported_param *ecn;
5400         struct sctp_prsctp_supported_param *prsctp;
5401         struct sctp_supported_chunk_types_param *pr_supported;
5402         union sctp_sockstore store, store1, *over_addr;
5403
5404 #ifdef INET
5405         struct sockaddr_in *sin, *to_sin;
5406
5407 #endif
5408 #ifdef INET6
5409         struct sockaddr_in6 *sin6, *to_sin6;
5410
5411 #endif
5412         struct ip *iph;
5413
5414 #ifdef INET6
5415         struct ip6_hdr *ip6;
5416
5417 #endif
5418         struct sockaddr *to;
5419         struct sctp_state_cookie stc;
5420         struct sctp_nets *net = NULL;
5421         uint8_t *signature = NULL;
5422         int cnt_inits_to = 0;
5423         uint16_t his_limit, i_want;
5424         int abort_flag, padval;
5425         int num_ext;
5426         int p_len;
5427         int nat_friendly = 0;
5428         struct socket *so;
5429
5430         if (stcb)
5431                 asoc = &stcb->asoc;
5432         else
5433                 asoc = NULL;
5434         mp_last = NULL;
5435         if ((asoc != NULL) &&
5436             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5437             (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5438                 /* new addresses, out of here in non-cookie-wait states */
5439                 /*
5440                  * Send a ABORT, we don't add the new address error clause
5441                  * though we even set the T bit and copy in the 0 tag.. this
5442                  * looks no different than if no listener was present.
5443                  */
5444                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5445                 return;
5446         }
5447         abort_flag = 0;
5448         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5449             (offset + sizeof(struct sctp_init_chunk)),
5450             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5451         if (abort_flag) {
5452 do_a_abort:
5453                 sctp_send_abort(init_pkt, iphlen, sh,
5454                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5455                 return;
5456         }
5457         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5458         if (m == NULL) {
5459                 /* No memory, INIT timer will re-attempt. */
5460                 if (op_err)
5461                         sctp_m_freem(op_err);
5462                 return;
5463         }
5464         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5465
5466         /* the time I built cookie */
5467         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5468
5469         /* populate any tie tags */
5470         if (asoc != NULL) {
5471                 /* unlock before tag selections */
5472                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5473                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5474                 stc.cookie_life = asoc->cookie_life;
5475                 net = asoc->primary_destination;
5476         } else {
5477                 stc.tie_tag_my_vtag = 0;
5478                 stc.tie_tag_peer_vtag = 0;
5479                 /* life I will award this cookie */
5480                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5481         }
5482
5483         /* copy in the ports for later check */
5484         stc.myport = sh->dest_port;
5485         stc.peerport = sh->src_port;
5486
5487         /*
5488          * If we wanted to honor cookie life extentions, we would add to
5489          * stc.cookie_life. For now we should NOT honor any extension
5490          */
5491         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5492         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5493                 struct inpcb *in_inp;
5494
5495                 /* Its a V6 socket */
5496                 in_inp = (struct inpcb *)inp;
5497                 stc.ipv6_addr_legal = 1;
5498                 /* Now look at the binding flag to see if V4 will be legal */
5499                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5500                         stc.ipv4_addr_legal = 1;
5501                 } else {
5502                         /* V4 addresses are NOT legal on the association */
5503                         stc.ipv4_addr_legal = 0;
5504                 }
5505         } else {
5506                 /* Its a V4 socket, no - V6 */
5507                 stc.ipv4_addr_legal = 1;
5508                 stc.ipv6_addr_legal = 0;
5509         }
5510
5511 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5512         stc.ipv4_scope = 1;
5513 #else
5514         stc.ipv4_scope = 0;
5515 #endif
5516         /* now for scope setup */
5517         memset((caddr_t)&store, 0, sizeof(store));
5518         memset((caddr_t)&store1, 0, sizeof(store1));
5519 #ifdef INET
5520         sin = &store.sin;
5521         to_sin = &store1.sin;
5522 #endif
5523 #ifdef INET6
5524         sin6 = &store.sin6;
5525         to_sin6 = &store1.sin6;
5526 #endif
5527         iph = mtod(init_pkt, struct ip *);
5528         /* establish the to_addr's */
5529         switch (iph->ip_v) {
5530 #ifdef INET
5531         case IPVERSION:
5532                 to_sin->sin_port = sh->dest_port;
5533                 to_sin->sin_family = AF_INET;
5534                 to_sin->sin_len = sizeof(struct sockaddr_in);
5535                 to_sin->sin_addr = iph->ip_dst;
5536                 break;
5537 #endif
5538 #ifdef INET6
5539         case IPV6_VERSION >> 4:
5540                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5541                 to_sin6->sin6_addr = ip6->ip6_dst;
5542                 to_sin6->sin6_scope_id = 0;
5543                 to_sin6->sin6_port = sh->dest_port;
5544                 to_sin6->sin6_family = AF_INET6;
5545                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5546                 break;
5547 #endif
5548         default:
5549                 goto do_a_abort;
5550                 break;
5551         }
5552
5553         if (net == NULL) {
5554                 to = (struct sockaddr *)&store;
5555                 switch (iph->ip_v) {
5556 #ifdef INET
5557                 case IPVERSION:
5558                         {
5559                                 sin->sin_family = AF_INET;
5560                                 sin->sin_len = sizeof(struct sockaddr_in);
5561                                 sin->sin_port = sh->src_port;
5562                                 sin->sin_addr = iph->ip_src;
5563                                 /* lookup address */
5564                                 stc.address[0] = sin->sin_addr.s_addr;
5565                                 stc.address[1] = 0;
5566                                 stc.address[2] = 0;
5567                                 stc.address[3] = 0;
5568                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5569                                 /* local from address */
5570                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5571                                 stc.laddress[1] = 0;
5572                                 stc.laddress[2] = 0;
5573                                 stc.laddress[3] = 0;
5574                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5575                                 /* scope_id is only for v6 */
5576                                 stc.scope_id = 0;
5577 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5578                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5579                                         stc.ipv4_scope = 1;
5580                                 }
5581 #else
5582                                 stc.ipv4_scope = 1;
5583 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5584                                 /* Must use the address in this case */
5585                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5586                                         stc.loopback_scope = 1;
5587                                         stc.ipv4_scope = 1;
5588                                         stc.site_scope = 1;
5589                                         stc.local_scope = 0;
5590                                 }
5591                                 break;
5592                         }
5593 #endif
5594 #ifdef INET6
5595                 case IPV6_VERSION >> 4:
5596                         {
5597                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5598                                 sin6->sin6_family = AF_INET6;
5599                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5600                                 sin6->sin6_port = sh->src_port;
5601                                 sin6->sin6_addr = ip6->ip6_src;
5602                                 /* lookup address */
5603                                 memcpy(&stc.address, &sin6->sin6_addr,
5604                                     sizeof(struct in6_addr));
5605                                 sin6->sin6_scope_id = 0;
5606                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5607                                 stc.scope_id = 0;
5608                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5609                                         /*
5610                                          * FIX ME: does this have scope from
5611                                          * rcvif?
5612                                          */
5613                                         (void)sa6_recoverscope(sin6);
5614                                         stc.scope_id = sin6->sin6_scope_id;
5615                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5616                                         stc.loopback_scope = 1;
5617                                         stc.local_scope = 0;
5618                                         stc.site_scope = 1;
5619                                         stc.ipv4_scope = 1;
5620                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5621                                         /*
5622                                          * If the new destination is a
5623                                          * LINK_LOCAL we must have common
5624                                          * both site and local scope. Don't
5625                                          * set local scope though since we
5626                                          * must depend on the source to be
5627                                          * added implicitly. We cannot
5628                                          * assure just because we share one
5629                                          * link that all links are common.
5630                                          */
5631                                         stc.local_scope = 0;
5632                                         stc.site_scope = 1;
5633                                         stc.ipv4_scope = 1;
5634                                         /*
5635                                          * we start counting for the private
5636                                          * address stuff at 1. since the
5637                                          * link local we source from won't
5638                                          * show up in our scoped count.
5639                                          */
5640                                         cnt_inits_to = 1;
5641                                         /*
5642                                          * pull out the scope_id from
5643                                          * incoming pkt
5644                                          */
5645                                         /*
5646                                          * FIX ME: does this have scope from
5647                                          * rcvif?
5648                                          */
5649                                         (void)sa6_recoverscope(sin6);
5650                                         stc.scope_id = sin6->sin6_scope_id;
5651                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5652                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5653                                         /*
5654                                          * If the new destination is
5655                                          * SITE_LOCAL then we must have site
5656                                          * scope in common.
5657                                          */
5658                                         stc.site_scope = 1;
5659                                 }
5660                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5661                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5662                                 break;
5663                         }
5664 #endif
5665                 default:
5666                         /* TSNH */
5667                         goto do_a_abort;
5668                         break;
5669                 }
5670         } else {
5671                 /* set the scope per the existing tcb */
5672
5673 #ifdef INET6
5674                 struct sctp_nets *lnet;
5675
5676 #endif
5677
5678                 stc.loopback_scope = asoc->loopback_scope;
5679                 stc.ipv4_scope = asoc->ipv4_local_scope;
5680                 stc.site_scope = asoc->site_scope;
5681                 stc.local_scope = asoc->local_scope;
5682 #ifdef INET6
5683                 /* Why do we not consider IPv4 LL addresses? */
5684                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5685                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5686                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5687                                         /*
5688                                          * if we have a LL address, start
5689                                          * counting at 1.
5690                                          */
5691                                         cnt_inits_to = 1;
5692                                 }
5693                         }
5694                 }
5695 #endif
5696                 /* use the net pointer */
5697                 to = (struct sockaddr *)&net->ro._l_addr;
5698                 switch (to->sa_family) {
5699 #ifdef INET
5700                 case AF_INET:
5701                         sin = (struct sockaddr_in *)to;
5702                         stc.address[0] = sin->sin_addr.s_addr;
5703                         stc.address[1] = 0;
5704                         stc.address[2] = 0;
5705                         stc.address[3] = 0;
5706                         stc.addr_type = SCTP_IPV4_ADDRESS;
5707                         if (net->src_addr_selected == 0) {
5708                                 /*
5709                                  * strange case here, the INIT should have
5710                                  * did the selection.
5711                                  */
5712                                 net->ro._s_addr = sctp_source_address_selection(inp,
5713                                     stcb, (sctp_route_t *) & net->ro,
5714                                     net, 0, vrf_id);
5715                                 if (net->ro._s_addr == NULL)
5716                                         return;
5717
5718                                 net->src_addr_selected = 1;
5719
5720                         }
5721                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5722                         stc.laddress[1] = 0;
5723                         stc.laddress[2] = 0;
5724                         stc.laddress[3] = 0;
5725                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5726                         /* scope_id is only for v6 */
5727                         stc.scope_id = 0;
5728                         break;
5729 #endif
5730 #ifdef INET6
5731                 case AF_INET6:
5732                         sin6 = (struct sockaddr_in6 *)to;
5733                         memcpy(&stc.address, &sin6->sin6_addr,
5734                             sizeof(struct in6_addr));
5735                         stc.addr_type = SCTP_IPV6_ADDRESS;
5736                         stc.scope_id = sin6->sin6_scope_id;
5737                         if (net->src_addr_selected == 0) {
5738                                 /*
5739                                  * strange case here, the INIT should have
5740                                  * did the selection.
5741                                  */
5742                                 net->ro._s_addr = sctp_source_address_selection(inp,
5743                                     stcb, (sctp_route_t *) & net->ro,
5744                                     net, 0, vrf_id);
5745                                 if (net->ro._s_addr == NULL)
5746                                         return;
5747
5748                                 net->src_addr_selected = 1;
5749                         }
5750                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5751                             sizeof(struct in6_addr));
5752                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5753                         break;
5754 #endif
5755                 }
5756         }
5757         /* Now lets put the SCTP header in place */
5758         initack = mtod(m, struct sctp_init_ack_chunk *);
5759         /* Save it off for quick ref */
5760         stc.peers_vtag = init_chk->init.initiate_tag;
5761         /* who are we */
5762         memcpy(stc.identification, SCTP_VERSION_STRING,
5763             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5764         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5765         /* now the chunk header */
5766         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5767         initack->ch.chunk_flags = 0;
5768         /* fill in later from mbuf we build */
5769         initack->ch.chunk_length = 0;
5770         /* place in my tag */
5771         if ((asoc != NULL) &&
5772             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5773             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5774             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5775                 /* re-use the v-tags and init-seq here */
5776                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5777                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5778         } else {
5779                 uint32_t vtag, itsn;
5780
5781                 if (hold_inp_lock) {
5782                         SCTP_INP_INCR_REF(inp);
5783                         SCTP_INP_RUNLOCK(inp);
5784                 }
5785                 if (asoc) {
5786                         atomic_add_int(&asoc->refcnt, 1);
5787                         SCTP_TCB_UNLOCK(stcb);
5788         new_tag:
5789                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5790                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5791                                 /*
5792                                  * Got a duplicate vtag on some guy behind a
5793                                  * nat make sure we don't use it.
5794                                  */
5795                                 goto new_tag;
5796                         }
5797                         initack->init.initiate_tag = htonl(vtag);
5798                         /* get a TSN to use too */
5799                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5800                         initack->init.initial_tsn = htonl(itsn);
5801                         SCTP_TCB_LOCK(stcb);
5802                         atomic_add_int(&asoc->refcnt, -1);
5803                 } else {
5804                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5805                         initack->init.initiate_tag = htonl(vtag);
5806                         /* get a TSN to use too */
5807                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5808                 }
5809                 if (hold_inp_lock) {
5810                         SCTP_INP_RLOCK(inp);
5811                         SCTP_INP_DECR_REF(inp);
5812                 }
5813         }
5814         /* save away my tag to */
5815         stc.my_vtag = initack->init.initiate_tag;
5816
5817         /* set up some of the credits. */
5818         so = inp->sctp_socket;
5819         if (so == NULL) {
5820                 /* memory problem */
5821                 sctp_m_freem(m);
5822                 return;
5823         } else {
5824                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5825         }
5826         /* set what I want */
5827         his_limit = ntohs(init_chk->init.num_inbound_streams);
5828         /* choose what I want */
5829         if (asoc != NULL) {
5830                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5831                         i_want = asoc->streamoutcnt;
5832                 } else {
5833                         i_want = inp->sctp_ep.pre_open_stream_count;
5834                 }
5835         } else {
5836                 i_want = inp->sctp_ep.pre_open_stream_count;
5837         }
5838         if (his_limit < i_want) {
5839                 /* I Want more :< */
5840                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5841         } else {
5842                 /* I can have what I want :> */
5843                 initack->init.num_outbound_streams = htons(i_want);
5844         }
5845         /* tell him his limt. */
5846         initack->init.num_inbound_streams =
5847             htons(inp->sctp_ep.max_open_streams_intome);
5848
5849         /* adaptation layer indication parameter */
5850         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5851         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5852         ali->ph.param_length = htons(sizeof(*ali));
5853         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5854         SCTP_BUF_LEN(m) += sizeof(*ali);
5855         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5856
5857         /* ECN parameter */
5858         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5859             (inp->sctp_ecn_enable == 1)) {
5860                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5861                 ecn->ph.param_length = htons(sizeof(*ecn));
5862                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5863
5864                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5865                     sizeof(*ecn));
5866         } else {
5867                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5868         }
5869         /* And now tell the peer we do  pr-sctp */
5870         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5871         prsctp->ph.param_length = htons(sizeof(*prsctp));
5872         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5873         if (nat_friendly) {
5874                 /* Add NAT friendly parameter */
5875                 struct sctp_paramhdr *ph;
5876
5877                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5878                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5879                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5880                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5881         }
5882         /* And now tell the peer we do all the extensions */
5883         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5884         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5885         num_ext = 0;
5886         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5887         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5888         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5889         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5890         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5891         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5892                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5893         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5894                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5895         p_len = sizeof(*pr_supported) + num_ext;
5896         pr_supported->ph.param_length = htons(p_len);
5897         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5898         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5899
5900         /* add authentication parameters */
5901         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5902                 struct sctp_auth_random *randp;
5903                 struct sctp_auth_hmac_algo *hmacs;
5904                 struct sctp_auth_chunk_list *chunks;
5905                 uint16_t random_len;
5906
5907                 /* generate and add RANDOM parameter */
5908                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5909                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5910                 randp->ph.param_type = htons(SCTP_RANDOM);
5911                 p_len = sizeof(*randp) + random_len;
5912                 randp->ph.param_length = htons(p_len);
5913                 SCTP_READ_RANDOM(randp->random_data, random_len);
5914                 /* zero out any padding required */
5915                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5916                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5917
5918                 /* add HMAC_ALGO parameter */
5919                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5920                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5921                     (uint8_t *) hmacs->hmac_ids);
5922                 if (p_len > 0) {
5923                         p_len += sizeof(*hmacs);
5924                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5925                         hmacs->ph.param_length = htons(p_len);
5926                         /* zero out any padding required */
5927                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5928                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5929                 }
5930                 /* add CHUNKS parameter */
5931                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5932                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5933                     chunks->chunk_types);
5934                 if (p_len > 0) {
5935                         p_len += sizeof(*chunks);
5936                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5937                         chunks->ph.param_length = htons(p_len);
5938                         /* zero out any padding required */
5939                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5940                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5941                 }
5942         }
5943         m_at = m;
5944         /* now the addresses */
5945         {
5946                 struct sctp_scoping scp;
5947
5948                 /*
5949                  * To optimize this we could put the scoping stuff into a
5950                  * structure and remove the individual uint8's from the stc
5951                  * structure. Then we could just sifa in the address within
5952                  * the stc.. but for now this is a quick hack to get the
5953                  * address stuff teased apart.
5954                  */
5955                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5956                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5957                 scp.loopback_scope = stc.loopback_scope;
5958                 scp.ipv4_local_scope = stc.ipv4_scope;
5959                 scp.local_scope = stc.local_scope;
5960                 scp.site_scope = stc.site_scope;
5961                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5962         }
5963
5964         /* tack on the operational error if present */
5965         if (op_err) {
5966                 struct mbuf *ol;
5967                 int llen;
5968
5969                 llen = 0;
5970                 ol = op_err;
5971
5972                 while (ol) {
5973                         llen += SCTP_BUF_LEN(ol);
5974                         ol = SCTP_BUF_NEXT(ol);
5975                 }
5976                 if (llen % 4) {
5977                         /* must add a pad to the param */
5978                         uint32_t cpthis = 0;
5979                         int padlen;
5980
5981                         padlen = 4 - (llen % 4);
5982                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5983                 }
5984                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5985                         m_at = SCTP_BUF_NEXT(m_at);
5986                 }
5987                 SCTP_BUF_NEXT(m_at) = op_err;
5988                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5989                         m_at = SCTP_BUF_NEXT(m_at);
5990                 }
5991         }
5992         /* pre-calulate the size and update pkt header and chunk header */
5993         p_len = 0;
5994         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5995                 p_len += SCTP_BUF_LEN(m_tmp);
5996                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5997                         /* m_tmp should now point to last one */
5998                         break;
5999                 }
6000         }
6001
6002         /* Now we must build a cookie */
6003         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6004         if (m_cookie == NULL) {
6005                 /* memory problem */
6006                 sctp_m_freem(m);
6007                 return;
6008         }
6009         /* Now append the cookie to the end and update the space/size */
6010         SCTP_BUF_NEXT(m_tmp) = m_cookie;
6011
6012         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6013                 p_len += SCTP_BUF_LEN(m_tmp);
6014                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6015                         /* m_tmp should now point to last one */
6016                         mp_last = m_tmp;
6017                         break;
6018                 }
6019         }
6020         /*
6021          * Place in the size, but we don't include the last pad (if any) in
6022          * the INIT-ACK.
6023          */
6024         initack->ch.chunk_length = htons(p_len);
6025
6026         /*
6027          * Time to sign the cookie, we don't sign over the cookie signature
6028          * though thus we set trailer.
6029          */
6030         (void)sctp_hmac_m(SCTP_HMAC,
6031             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6032             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6033             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6034         /*
6035          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6036          * here since the timer will drive a retranmission.
6037          */
6038         padval = p_len % 4;
6039         if ((padval) && (mp_last)) {
6040                 /* see my previous comments on mp_last */
6041                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6042                         /* Houston we have a problem, no space */
6043                         sctp_m_freem(m);
6044                         return;
6045                 }
6046         }
6047         if (stc.loopback_scope) {
6048                 over_addr = &store1;
6049         } else {
6050                 over_addr = NULL;
6051         }
6052
6053         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6054             0, 0,
6055             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6056             port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
6057         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6058 }
6059
6060
6061 static void
6062 sctp_prune_prsctp(struct sctp_tcb *stcb,
6063     struct sctp_association *asoc,
6064     struct sctp_sndrcvinfo *srcv,
6065     int dataout)
6066 {
6067         int freed_spc = 0;
6068         struct sctp_tmit_chunk *chk, *nchk;
6069
6070         SCTP_TCB_LOCK_ASSERT(stcb);
6071         if ((asoc->peer_supports_prsctp) &&
6072             (asoc->sent_queue_cnt_removeable > 0)) {
6073                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6074                         /*
6075                          * Look for chunks marked with the PR_SCTP flag AND
6076                          * the buffer space flag. If the one being sent is
6077                          * equal or greater priority then purge the old one
6078                          * and free some space.
6079                          */
6080                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6081                                 /*
6082                                  * This one is PR-SCTP AND buffer space
6083                                  * limited type
6084                                  */
6085                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6086                                         /*
6087                                          * Lower numbers equates to higher
6088                                          * priority so if the one we are
6089                                          * looking at has a larger or equal
6090                                          * priority we want to drop the data
6091                                          * and NOT retransmit it.
6092                                          */
6093                                         if (chk->data) {
6094                                                 /*
6095                                                  * We release the book_size
6096                                                  * if the mbuf is here
6097                                                  */
6098                                                 int ret_spc;
6099                                                 int cause;
6100
6101                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6102                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
6103                                                 else
6104                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
6105                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6106                                                     cause,
6107                                                     SCTP_SO_LOCKED);
6108                                                 freed_spc += ret_spc;
6109                                                 if (freed_spc >= dataout) {
6110                                                         return;
6111                                                 }
6112                                         }       /* if chunk was present */
6113                                 }       /* if of sufficent priority */
6114                         }       /* if chunk has enabled */
6115                 }               /* tailqforeach */
6116
6117                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6118                         /* Here we must move to the sent queue and mark */
6119                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6120                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6121                                         if (chk->data) {
6122                                                 /*
6123                                                  * We release the book_size
6124                                                  * if the mbuf is here
6125                                                  */
6126                                                 int ret_spc;
6127
6128                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6129                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
6130                                                     SCTP_SO_LOCKED);
6131
6132                                                 freed_spc += ret_spc;
6133                                                 if (freed_spc >= dataout) {
6134                                                         return;
6135                                                 }
6136                                         }       /* end if chk->data */
6137                                 }       /* end if right class */
6138                         }       /* end if chk pr-sctp */
6139                 }               /* tailqforeachsafe (chk) */
6140         }                       /* if enabled in asoc */
6141 }
6142
6143 int
6144 sctp_get_frag_point(struct sctp_tcb *stcb,
6145     struct sctp_association *asoc)
6146 {
6147         int siz, ovh;
6148
6149         /*
6150          * For endpoints that have both v6 and v4 addresses we must reserve
6151          * room for the ipv6 header, for those that are only dealing with V4
6152          * we use a larger frag point.
6153          */
6154         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6155                 ovh = SCTP_MED_OVERHEAD;
6156         } else {
6157                 ovh = SCTP_MED_V4_OVERHEAD;
6158         }
6159
6160         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6161                 siz = asoc->smallest_mtu - ovh;
6162         else
6163                 siz = (stcb->asoc.sctp_frag_point - ovh);
6164         /*
6165          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6166          */
6167         /* A data chunk MUST fit in a cluster */
6168         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6169         /* } */
6170
6171         /* adjust for an AUTH chunk if DATA requires auth */
6172         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6173                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6174
6175         if (siz % 4) {
6176                 /* make it an even word boundary please */
6177                 siz -= (siz % 4);
6178         }
6179         return (siz);
6180 }
6181
6182 static void
6183 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6184 {
6185         sp->pr_sctp_on = 0;
6186         /*
6187          * We assume that the user wants PR_SCTP_TTL if the user provides a
6188          * positive lifetime but does not specify any PR_SCTP policy. This
6189          * is a BAD assumption and causes problems at least with the
6190          * U-Vancovers MPI folks. I will change this to be no policy means
6191          * NO PR-SCTP.
6192          */
6193         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6194                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6195                 sp->pr_sctp_on = 1;
6196         } else {
6197                 return;
6198         }
6199         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6200         case CHUNK_FLAGS_PR_SCTP_BUF:
6201                 /*
6202                  * Time to live is a priority stored in tv_sec when doing
6203                  * the buffer drop thing.
6204                  */
6205                 sp->ts.tv_sec = sp->timetolive;
6206                 sp->ts.tv_usec = 0;
6207                 break;
6208         case CHUNK_FLAGS_PR_SCTP_TTL:
6209                 {
6210                         struct timeval tv;
6211
6212                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6213                         tv.tv_sec = sp->timetolive / 1000;
6214                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6215                         /*
6216                          * TODO sctp_constants.h needs alternative time
6217                          * macros when _KERNEL is undefined.
6218                          */
6219                         timevaladd(&sp->ts, &tv);
6220                 }
6221                 break;
6222         case CHUNK_FLAGS_PR_SCTP_RTX:
6223                 /*
6224                  * Time to live is a the number or retransmissions stored in
6225                  * tv_sec.
6226                  */
6227                 sp->ts.tv_sec = sp->timetolive;
6228                 sp->ts.tv_usec = 0;
6229                 break;
6230         default:
6231                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6232                     "Unknown PR_SCTP policy %u.\n",
6233                     PR_SCTP_POLICY(sp->sinfo_flags));
6234                 break;
6235         }
6236 }
6237
6238 static int
6239 sctp_msg_append(struct sctp_tcb *stcb,
6240     struct sctp_nets *net,
6241     struct mbuf *m,
6242     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6243 {
6244         int error = 0;
6245         struct mbuf *at;
6246         struct sctp_stream_queue_pending *sp = NULL;
6247         struct sctp_stream_out *strm;
6248
6249         /*
6250          * Given an mbuf chain, put it into the association send queue and
6251          * place it on the wheel
6252          */
6253         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6254                 /* Invalid stream number */
6255                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6256                 error = EINVAL;
6257                 goto out_now;
6258         }
6259         if ((stcb->asoc.stream_locked) &&
6260             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6261                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6262                 error = EINVAL;
6263                 goto out_now;
6264         }
6265         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6266         /* Now can we send this? */
6267         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6268             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6269             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6270             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6271                 /* got data while shutting down */
6272                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6273                 error = ECONNRESET;
6274                 goto out_now;
6275         }
6276         sctp_alloc_a_strmoq(stcb, sp);
6277         if (sp == NULL) {
6278                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6279                 error = ENOMEM;
6280                 goto out_now;
6281         }
6282         sp->sinfo_flags = srcv->sinfo_flags;
6283         sp->timetolive = srcv->sinfo_timetolive;
6284         sp->ppid = srcv->sinfo_ppid;
6285         sp->context = srcv->sinfo_context;
6286         sp->strseq = 0;
6287         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6288                 sp->net = net;
6289                 atomic_add_int(&sp->net->ref_count, 1);
6290         } else {
6291                 sp->net = NULL;
6292         }
6293         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6294         sp->stream = srcv->sinfo_stream;
6295         sp->msg_is_complete = 1;
6296         sp->sender_all_done = 1;
6297         sp->some_taken = 0;
6298         sp->data = m;
6299         sp->tail_mbuf = NULL;
6300         sctp_set_prsctp_policy(sp);
6301         /*
6302          * We could in theory (for sendall) sifa the length in, but we would
6303          * still have to hunt through the chain since we need to setup the
6304          * tail_mbuf
6305          */
6306         sp->length = 0;
6307         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6308                 if (SCTP_BUF_NEXT(at) == NULL)
6309                         sp->tail_mbuf = at;
6310                 sp->length += SCTP_BUF_LEN(at);
6311         }
6312         if (srcv->sinfo_keynumber_valid) {
6313                 sp->auth_keyid = srcv->sinfo_keynumber;
6314         } else {
6315                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6316         }
6317         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6318                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6319                 sp->holds_key_ref = 1;
6320         }
6321         if (hold_stcb_lock == 0) {
6322                 SCTP_TCB_SEND_LOCK(stcb);
6323         }
6324         sctp_snd_sb_alloc(stcb, sp->length);
6325         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6326         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6327         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6328                 sp->strseq = strm->next_sequence_sent;
6329                 strm->next_sequence_sent++;
6330         }
6331         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6332         m = NULL;
6333         if (hold_stcb_lock == 0) {
6334                 SCTP_TCB_SEND_UNLOCK(stcb);
6335         }
6336 out_now:
6337         if (m) {
6338                 sctp_m_freem(m);
6339         }
6340         return (error);
6341 }
6342
6343
6344 static struct mbuf *
6345 sctp_copy_mbufchain(struct mbuf *clonechain,
6346     struct mbuf *outchain,
6347     struct mbuf **endofchain,
6348     int can_take_mbuf,
6349     int sizeofcpy,
6350     uint8_t copy_by_ref)
6351 {
6352         struct mbuf *m;
6353         struct mbuf *appendchain;
6354         caddr_t cp;
6355         int len;
6356
6357         if (endofchain == NULL) {
6358                 /* error */
6359 error_out:
6360                 if (outchain)
6361                         sctp_m_freem(outchain);
6362                 return (NULL);
6363         }
6364         if (can_take_mbuf) {
6365                 appendchain = clonechain;
6366         } else {
6367                 if (!copy_by_ref &&
6368                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6369                     ) {
6370                         /* Its not in a cluster */
6371                         if (*endofchain == NULL) {
6372                                 /* lets get a mbuf cluster */
6373                                 if (outchain == NULL) {
6374                                         /* This is the general case */
6375                         new_mbuf:
6376                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6377                                         if (outchain == NULL) {
6378                                                 goto error_out;
6379                                         }
6380                                         SCTP_BUF_LEN(outchain) = 0;
6381                                         *endofchain = outchain;
6382                                         /* get the prepend space */
6383                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6384                                 } else {
6385                                         /*
6386                                          * We really should not get a NULL
6387                                          * in endofchain
6388                                          */
6389                                         /* find end */
6390                                         m = outchain;
6391                                         while (m) {
6392                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6393                                                         *endofchain = m;
6394                                                         break;
6395                                                 }
6396                                                 m = SCTP_BUF_NEXT(m);
6397                                         }
6398                                         /* sanity */
6399                                         if (*endofchain == NULL) {
6400                                                 /*
6401                                                  * huh, TSNH XXX maybe we
6402                                                  * should panic
6403                                                  */
6404                                                 sctp_m_freem(outchain);
6405                                                 goto new_mbuf;
6406                                         }
6407                                 }
6408                                 /* get the new end of length */
6409                                 len = M_TRAILINGSPACE(*endofchain);
6410                         } else {
6411                                 /* how much is left at the end? */
6412                                 len = M_TRAILINGSPACE(*endofchain);
6413                         }
6414                         /* Find the end of the data, for appending */
6415                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6416
6417                         /* Now lets copy it out */
6418                         if (len >= sizeofcpy) {
6419                                 /* It all fits, copy it in */
6420                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6421                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6422                         } else {
6423                                 /* fill up the end of the chain */
6424                                 if (len > 0) {
6425                                         m_copydata(clonechain, 0, len, cp);
6426                                         SCTP_BUF_LEN((*endofchain)) += len;
6427                                         /* now we need another one */
6428                                         sizeofcpy -= len;
6429                                 }
6430                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6431                                 if (m == NULL) {
6432                                         /* We failed */
6433                                         goto error_out;
6434                                 }
6435                                 SCTP_BUF_NEXT((*endofchain)) = m;
6436                                 *endofchain = m;
6437                                 cp = mtod((*endofchain), caddr_t);
6438                                 m_copydata(clonechain, len, sizeofcpy, cp);
6439                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6440                         }
6441                         return (outchain);
6442                 } else {
6443                         /* copy the old fashion way */
6444                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6445 #ifdef SCTP_MBUF_LOGGING
6446                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6447                                 struct mbuf *mat;
6448
6449                                 mat = appendchain;
6450                                 while (mat) {
6451                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6452                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6453                                         }
6454                                         mat = SCTP_BUF_NEXT(mat);
6455                                 }
6456                         }
6457 #endif
6458                 }
6459         }
6460         if (appendchain == NULL) {
6461                 /* error */
6462                 if (outchain)
6463                         sctp_m_freem(outchain);
6464                 return (NULL);
6465         }
6466         if (outchain) {
6467                 /* tack on to the end */
6468                 if (*endofchain != NULL) {
6469                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6470                 } else {
6471                         m = outchain;
6472                         while (m) {
6473                                 if (SCTP_BUF_NEXT(m) == NULL) {
6474                                         SCTP_BUF_NEXT(m) = appendchain;
6475                                         break;
6476                                 }
6477                                 m = SCTP_BUF_NEXT(m);
6478                         }
6479                 }
6480                 /*
6481                  * save off the end and update the end-chain postion
6482                  */
6483                 m = appendchain;
6484                 while (m) {
6485                         if (SCTP_BUF_NEXT(m) == NULL) {
6486                                 *endofchain = m;
6487                                 break;
6488                         }
6489                         m = SCTP_BUF_NEXT(m);
6490                 }
6491                 return (outchain);
6492         } else {
6493                 /* save off the end and update the end-chain postion */
6494                 m = appendchain;
6495                 while (m) {
6496                         if (SCTP_BUF_NEXT(m) == NULL) {
6497                                 *endofchain = m;
6498                                 break;
6499                         }
6500                         m = SCTP_BUF_NEXT(m);
6501                 }
6502                 return (appendchain);
6503         }
6504 }
6505
6506 int
6507 sctp_med_chunk_output(struct sctp_inpcb *inp,
6508     struct sctp_tcb *stcb,
6509     struct sctp_association *asoc,
6510     int *num_out,
6511     int *reason_code,
6512     int control_only, int from_where,
6513     struct timeval *now, int *now_filled, int frag_point, int so_locked
6514 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6515     SCTP_UNUSED
6516 #endif
6517 );
6518
6519 static void
6520 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6521     uint32_t val SCTP_UNUSED)
6522 {
6523         struct sctp_copy_all *ca;
6524         struct mbuf *m;
6525         int ret = 0;
6526         int added_control = 0;
6527         int un_sent, do_chunk_output = 1;
6528         struct sctp_association *asoc;
6529         struct sctp_nets *net;
6530
6531         ca = (struct sctp_copy_all *)ptr;
6532         if (ca->m == NULL) {
6533                 return;
6534         }
6535         if (ca->inp != inp) {
6536                 /* TSNH */
6537                 return;
6538         }
6539         if ((ca->m) && ca->sndlen) {
6540                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6541                 if (m == NULL) {
6542                         /* can't copy so we are done */
6543                         ca->cnt_failed++;
6544                         return;
6545                 }
6546 #ifdef SCTP_MBUF_LOGGING
6547                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6548                         struct mbuf *mat;
6549
6550                         mat = m;
6551                         while (mat) {
6552                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6553                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6554                                 }
6555                                 mat = SCTP_BUF_NEXT(mat);
6556                         }
6557                 }
6558 #endif
6559         } else {
6560                 m = NULL;
6561         }
6562         SCTP_TCB_LOCK_ASSERT(stcb);
6563         if (stcb->asoc.alternate) {
6564                 net = stcb->asoc.alternate;
6565         } else {
6566                 net = stcb->asoc.primary_destination;
6567         }
6568         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6569                 /* Abort this assoc with m as the user defined reason */
6570                 if (m) {
6571                         struct sctp_paramhdr *ph;
6572
6573                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6574                         if (m) {
6575                                 ph = mtod(m, struct sctp_paramhdr *);
6576                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6577                                 ph->param_length = htons(ca->sndlen);
6578                         }
6579                         /*
6580                          * We add one here to keep the assoc from
6581                          * dis-appearing on us.
6582                          */
6583                         atomic_add_int(&stcb->asoc.refcnt, 1);
6584                         sctp_abort_an_association(inp, stcb,
6585                             SCTP_RESPONSE_TO_USER_REQ,
6586                             m, SCTP_SO_NOT_LOCKED);
6587                         /*
6588                          * sctp_abort_an_association calls sctp_free_asoc()
6589                          * free association will NOT free it since we
6590                          * incremented the refcnt .. we do this to prevent
6591                          * it being freed and things getting tricky since we
6592                          * could end up (from free_asoc) calling inpcb_free
6593                          * which would get a recursive lock call to the
6594                          * iterator lock.. But as a consequence of that the
6595                          * stcb will return to us un-locked.. since
6596                          * free_asoc returns with either no TCB or the TCB
6597                          * unlocked, we must relock.. to unlock in the
6598                          * iterator timer :-0
6599                          */
6600                         SCTP_TCB_LOCK(stcb);
6601                         atomic_add_int(&stcb->asoc.refcnt, -1);
6602                         goto no_chunk_output;
6603                 }
6604         } else {
6605                 if (m) {
6606                         ret = sctp_msg_append(stcb, net, m,
6607                             &ca->sndrcv, 1);
6608                 }
6609                 asoc = &stcb->asoc;
6610                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6611                         /* shutdown this assoc */
6612                         int cnt;
6613
6614                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6615
6616                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6617                             TAILQ_EMPTY(&asoc->sent_queue) &&
6618                             (cnt == 0)) {
6619                                 if (asoc->locked_on_sending) {
6620                                         goto abort_anyway;
6621                                 }
6622                                 /*
6623                                  * there is nothing queued to send, so I'm
6624                                  * done...
6625                                  */
6626                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6627                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6628                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6629                                         /*
6630                                          * only send SHUTDOWN the first time
6631                                          * through
6632                                          */
6633                                         sctp_send_shutdown(stcb, net);
6634                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6635                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6636                                         }
6637                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6638                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6639                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6640                                             net);
6641                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6642                                             asoc->primary_destination);
6643                                         added_control = 1;
6644                                         do_chunk_output = 0;
6645                                 }
6646                         } else {
6647                                 /*
6648                                  * we still got (or just got) data to send,
6649                                  * so set SHUTDOWN_PENDING
6650                                  */
6651                                 /*
6652                                  * XXX sockets draft says that SCTP_EOF
6653                                  * should be sent with no data.  currently,
6654                                  * we will allow user data to be sent first
6655                                  * and move to SHUTDOWN-PENDING
6656                                  */
6657                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6658                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6659                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6660                                         if (asoc->locked_on_sending) {
6661                                                 /*
6662                                                  * Locked to send out the
6663                                                  * data
6664                                                  */
6665                                                 struct sctp_stream_queue_pending *sp;
6666
6667                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6668                                                 if (sp) {
6669                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6670                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6671                                                 }
6672                                         }
6673                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6674                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6675                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6676                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6677                                 abort_anyway:
6678                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6679                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6680                                                     SCTP_RESPONSE_TO_USER_REQ,
6681                                                     NULL, SCTP_SO_NOT_LOCKED);
6682                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6683                                                 goto no_chunk_output;
6684                                         }
6685                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6686                                             asoc->primary_destination);
6687                                 }
6688                         }
6689
6690                 }
6691         }
6692         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6693             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6694
6695         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6696             (stcb->asoc.total_flight > 0) &&
6697             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6698             ) {
6699                 do_chunk_output = 0;
6700         }
6701         if (do_chunk_output)
6702                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6703         else if (added_control) {
6704                 int num_out = 0, reason = 0, now_filled = 0;
6705                 struct timeval now;
6706                 int frag_point;
6707
6708                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6709                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6710                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6711         }
6712 no_chunk_output:
6713         if (ret) {
6714                 ca->cnt_failed++;
6715         } else {
6716                 ca->cnt_sent++;
6717         }
6718 }
6719
6720 static void
6721 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6722 {
6723         struct sctp_copy_all *ca;
6724
6725         ca = (struct sctp_copy_all *)ptr;
6726         /*
6727          * Do a notify here? Kacheong suggests that the notify be done at
6728          * the send time.. so you would push up a notification if any send
6729          * failed. Don't know if this is feasable since the only failures we
6730          * have is "memory" related and if you cannot get an mbuf to send
6731          * the data you surely can't get an mbuf to send up to notify the
6732          * user you can't send the data :->
6733          */
6734
6735         /* now free everything */
6736         sctp_m_freem(ca->m);
6737         SCTP_FREE(ca, SCTP_M_COPYAL);
6738 }
6739
6740
6741 #define MC_ALIGN(m, len) do {                                           \
6742         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6743 } while (0)
6744
6745
6746
6747 static struct mbuf *
6748 sctp_copy_out_all(struct uio *uio, int len)
6749 {
6750         struct mbuf *ret, *at;
6751         int left, willcpy, cancpy, error;
6752
6753         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6754         if (ret == NULL) {
6755                 /* TSNH */
6756                 return (NULL);
6757         }
6758         left = len;
6759         SCTP_BUF_LEN(ret) = 0;
6760         /* save space for the data chunk header */
6761         cancpy = M_TRAILINGSPACE(ret);
6762         willcpy = min(cancpy, left);
6763         at = ret;
6764         while (left > 0) {
6765                 /* Align data to the end */
6766                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6767                 if (error) {
6768         err_out_now:
6769                         sctp_m_freem(at);
6770                         return (NULL);
6771                 }
6772                 SCTP_BUF_LEN(at) = willcpy;
6773                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6774                 left -= willcpy;
6775                 if (left > 0) {
6776                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6777                         if (SCTP_BUF_NEXT(at) == NULL) {
6778                                 goto err_out_now;
6779                         }
6780                         at = SCTP_BUF_NEXT(at);
6781                         SCTP_BUF_LEN(at) = 0;
6782                         cancpy = M_TRAILINGSPACE(at);
6783                         willcpy = min(cancpy, left);
6784                 }
6785         }
6786         return (ret);
6787 }
6788
6789 static int
6790 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6791     struct sctp_sndrcvinfo *srcv)
6792 {
6793         int ret;
6794         struct sctp_copy_all *ca;
6795
6796         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6797             SCTP_M_COPYAL);
6798         if (ca == NULL) {
6799                 sctp_m_freem(m);
6800                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6801                 return (ENOMEM);
6802         }
6803         memset(ca, 0, sizeof(struct sctp_copy_all));
6804
6805         ca->inp = inp;
6806         if (srcv) {
6807                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6808         }
6809         /*
6810          * take off the sendall flag, it would be bad if we failed to do
6811          * this :-0
6812          */
6813         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6814         /* get length and mbuf chain */
6815         if (uio) {
6816                 ca->sndlen = uio->uio_resid;
6817                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6818                 if (ca->m == NULL) {
6819                         SCTP_FREE(ca, SCTP_M_COPYAL);
6820                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6821                         return (ENOMEM);
6822                 }
6823         } else {
6824                 /* Gather the length of the send */
6825                 struct mbuf *mat;
6826
6827                 mat = m;
6828                 ca->sndlen = 0;
6829                 while (m) {
6830                         ca->sndlen += SCTP_BUF_LEN(m);
6831                         m = SCTP_BUF_NEXT(m);
6832                 }
6833                 ca->m = mat;
6834         }
6835         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6836             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6837             SCTP_ASOC_ANY_STATE,
6838             (void *)ca, 0,
6839             sctp_sendall_completes, inp, 1);
6840         if (ret) {
6841                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6842                 SCTP_FREE(ca, SCTP_M_COPYAL);
6843                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6844                 return (EFAULT);
6845         }
6846         return (0);
6847 }
6848
6849
6850 void
6851 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6852 {
6853         struct sctp_tmit_chunk *chk, *nchk;
6854
6855         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6856                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6857                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6858                         if (chk->data) {
6859                                 sctp_m_freem(chk->data);
6860                                 chk->data = NULL;
6861                         }
6862                         asoc->ctrl_queue_cnt--;
6863                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6864                 }
6865         }
6866 }
6867
6868 void
6869 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6870 {
6871         struct sctp_association *asoc;
6872         struct sctp_tmit_chunk *chk, *nchk;
6873         struct sctp_asconf_chunk *acp;
6874
6875         asoc = &stcb->asoc;
6876         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6877                 /* find SCTP_ASCONF chunk in queue */
6878                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6879                         if (chk->data) {
6880                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6881                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6882                                         /* Not Acked yet */
6883                                         break;
6884                                 }
6885                         }
6886                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6887                         if (chk->data) {
6888                                 sctp_m_freem(chk->data);
6889                                 chk->data = NULL;
6890                         }
6891                         asoc->ctrl_queue_cnt--;
6892                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6893                 }
6894         }
6895 }
6896
6897
6898 static void
6899 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6900     struct sctp_association *asoc,
6901     struct sctp_tmit_chunk **data_list,
6902     int bundle_at,
6903     struct sctp_nets *net)
6904 {
6905         int i;
6906         struct sctp_tmit_chunk *tp1;
6907
6908         for (i = 0; i < bundle_at; i++) {
6909                 /* off of the send queue */
6910                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6911                 asoc->send_queue_cnt--;
6912                 if (i > 0) {
6913                         /*
6914                          * Any chunk NOT 0 you zap the time chunk 0 gets
6915                          * zapped or set based on if a RTO measurment is
6916                          * needed.
6917                          */
6918                         data_list[i]->do_rtt = 0;
6919                 }
6920                 /* record time */
6921                 data_list[i]->sent_rcv_time = net->last_sent_time;
6922                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6923                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6924                 if (data_list[i]->whoTo == NULL) {
6925                         data_list[i]->whoTo = net;
6926                         atomic_add_int(&net->ref_count, 1);
6927                 }
6928                 /* on to the sent queue */
6929                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6930                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6931                         struct sctp_tmit_chunk *tpp;
6932
6933                         /* need to move back */
6934         back_up_more:
6935                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6936                         if (tpp == NULL) {
6937                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6938                                 goto all_done;
6939                         }
6940                         tp1 = tpp;
6941                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6942                                 goto back_up_more;
6943                         }
6944                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6945                 } else {
6946                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6947                             data_list[i],
6948                             sctp_next);
6949                 }
6950 all_done:
6951                 /* This does not lower until the cum-ack passes it */
6952                 asoc->sent_queue_cnt++;
6953                 if ((asoc->peers_rwnd <= 0) &&
6954                     (asoc->total_flight == 0) &&
6955                     (bundle_at == 1)) {
6956                         /* Mark the chunk as being a window probe */
6957                         SCTP_STAT_INCR(sctps_windowprobed);
6958                 }
6959 #ifdef SCTP_AUDITING_ENABLED
6960                 sctp_audit_log(0xC2, 3);
6961 #endif
6962                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6963                 data_list[i]->snd_count = 1;
6964                 data_list[i]->rec.data.chunk_was_revoked = 0;
6965                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6966                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6967                             data_list[i]->whoTo->flight_size,
6968                             data_list[i]->book_size,
6969                             (uintptr_t) data_list[i]->whoTo,
6970                             data_list[i]->rec.data.TSN_seq);
6971                 }
6972                 sctp_flight_size_increase(data_list[i]);
6973                 sctp_total_flight_increase(stcb, data_list[i]);
6974                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6975                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6976                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6977                 }
6978                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6979                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6980                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6981                         /* SWS sender side engages */
6982                         asoc->peers_rwnd = 0;
6983                 }
6984         }
6985         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6986                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6987         }
6988 }
6989
6990 static void
6991 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6992 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6993     SCTP_UNUSED
6994 #endif
6995 )
6996 {
6997         struct sctp_tmit_chunk *chk, *nchk;
6998
6999         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7000                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7001                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7002                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7003                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7004                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7005                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7006                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7007                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7008                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7009                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7010                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7011                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7012                         /* Stray chunks must be cleaned up */
7013         clean_up_anyway:
7014                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7015                         if (chk->data) {
7016                                 sctp_m_freem(chk->data);
7017                                 chk->data = NULL;
7018                         }
7019                         asoc->ctrl_queue_cnt--;
7020                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7021                                 asoc->fwd_tsn_cnt--;
7022                         sctp_free_a_chunk(stcb, chk, so_locked);
7023                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7024                         /* special handling, we must look into the param */
7025                         if (chk != asoc->str_reset) {
7026                                 goto clean_up_anyway;
7027                         }
7028                 }
7029         }
7030 }
7031
7032
7033 static int
7034 sctp_can_we_split_this(struct sctp_tcb *stcb,
7035     uint32_t length,
7036     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7037 {
7038         /*
7039          * Make a decision on if I should split a msg into multiple parts.
7040          * This is only asked of incomplete messages.
7041          */
7042         if (eeor_on) {
7043                 /*
7044                  * If we are doing EEOR we need to always send it if its the
7045                  * entire thing, since it might be all the guy is putting in
7046                  * the hopper.
7047                  */
7048                 if (goal_mtu >= length) {
7049                         /*-
7050                          * If we have data outstanding,
7051                          * we get another chance when the sack
7052                          * arrives to transmit - wait for more data
7053                          */
7054                         if (stcb->asoc.total_flight == 0) {
7055                                 /*
7056                                  * If nothing is in flight, we zero the
7057                                  * packet counter.
7058                                  */
7059                                 return (length);
7060                         }
7061                         return (0);
7062
7063                 } else {
7064                         /* You can fill the rest */
7065                         return (goal_mtu);
7066                 }
7067         }
7068         /*-
7069          * For those strange folk that make the send buffer
7070          * smaller than our fragmentation point, we can't
7071          * get a full msg in so we have to allow splitting.
7072          */
7073         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7074                 return (length);
7075         }
7076         if ((length <= goal_mtu) ||
7077             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7078                 /* Sub-optimial residual don't split in non-eeor mode. */
7079                 return (0);
7080         }
7081         /*
7082          * If we reach here length is larger than the goal_mtu. Do we wish
7083          * to split it for the sake of packet putting together?
7084          */
7085         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7086                 /* Its ok to split it */
7087                 return (min(goal_mtu, frag_point));
7088         }
7089         /* Nope, can't split */
7090         return (0);
7091
7092 }
7093
7094 static uint32_t
7095 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7096     struct sctp_stream_out *strq,
7097     uint32_t goal_mtu,
7098     uint32_t frag_point,
7099     int *locked,
7100     int *giveup,
7101     int eeor_mode,
7102     int *bail,
7103     int so_locked
7104 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7105     SCTP_UNUSED
7106 #endif
7107 )
7108 {
7109         /* Move from the stream to the send_queue keeping track of the total */
7110         struct sctp_association *asoc;
7111         struct sctp_stream_queue_pending *sp;
7112         struct sctp_tmit_chunk *chk;
7113         struct sctp_data_chunk *dchkh;
7114         uint32_t to_move, length;
7115         uint8_t rcv_flags = 0;
7116         uint8_t some_taken;
7117         uint8_t send_lock_up = 0;
7118
7119         SCTP_TCB_LOCK_ASSERT(stcb);
7120         asoc = &stcb->asoc;
7121 one_more_time:
7122         /* sa_ignore FREED_MEMORY */
7123         sp = TAILQ_FIRST(&strq->outqueue);
7124         if (sp == NULL) {
7125                 *locked = 0;
7126                 if (send_lock_up == 0) {
7127                         SCTP_TCB_SEND_LOCK(stcb);
7128                         send_lock_up = 1;
7129                 }
7130                 sp = TAILQ_FIRST(&strq->outqueue);
7131                 if (sp) {
7132                         goto one_more_time;
7133                 }
7134                 if (strq->last_msg_incomplete) {
7135                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7136                             strq->stream_no,
7137                             strq->last_msg_incomplete);
7138                         strq->last_msg_incomplete = 0;
7139                 }
7140                 to_move = 0;
7141                 if (send_lock_up) {
7142                         SCTP_TCB_SEND_UNLOCK(stcb);
7143                         send_lock_up = 0;
7144                 }
7145                 goto out_of;
7146         }
7147         if ((sp->msg_is_complete) && (sp->length == 0)) {
7148                 if (sp->sender_all_done) {
7149                         /*
7150                          * We are doing differed cleanup. Last time through
7151                          * when we took all the data the sender_all_done was
7152                          * not set.
7153                          */
7154                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7155                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7156                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7157                                     sp->sender_all_done,
7158                                     sp->length,
7159                                     sp->msg_is_complete,
7160                                     sp->put_last_out,
7161                                     send_lock_up);
7162                         }
7163                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7164                                 SCTP_TCB_SEND_LOCK(stcb);
7165                                 send_lock_up = 1;
7166                         }
7167                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7168                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7169                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7170                         if (sp->net) {
7171                                 sctp_free_remote_addr(sp->net);
7172                                 sp->net = NULL;
7173                         }
7174                         if (sp->data) {
7175                                 sctp_m_freem(sp->data);
7176                                 sp->data = NULL;
7177                         }
7178                         sctp_free_a_strmoq(stcb, sp, so_locked);
7179                         /* we can't be locked to it */
7180                         *locked = 0;
7181                         stcb->asoc.locked_on_sending = NULL;
7182                         if (send_lock_up) {
7183                                 SCTP_TCB_SEND_UNLOCK(stcb);
7184                                 send_lock_up = 0;
7185                         }
7186                         /* back to get the next msg */
7187                         goto one_more_time;
7188                 } else {
7189                         /*
7190                          * sender just finished this but still holds a
7191                          * reference
7192                          */
7193                         *locked = 1;
7194                         *giveup = 1;
7195                         to_move = 0;
7196                         goto out_of;
7197                 }
7198         } else {
7199                 /* is there some to get */
7200                 if (sp->length == 0) {
7201                         /* no */
7202                         *locked = 1;
7203                         *giveup = 1;
7204                         to_move = 0;
7205                         goto out_of;
7206                 } else if (sp->discard_rest) {
7207                         if (send_lock_up == 0) {
7208                                 SCTP_TCB_SEND_LOCK(stcb);
7209                                 send_lock_up = 1;
7210                         }
7211                         /* Whack down the size */
7212                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7213                         if ((stcb->sctp_socket != NULL) && \
7214                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7215                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7216                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7217                         }
7218                         if (sp->data) {
7219                                 sctp_m_freem(sp->data);
7220                                 sp->data = NULL;
7221                                 sp->tail_mbuf = NULL;
7222                         }
7223                         sp->length = 0;
7224                         sp->some_taken = 1;
7225                         *locked = 1;
7226                         *giveup = 1;
7227                         to_move = 0;
7228                         goto out_of;
7229                 }
7230         }
7231         some_taken = sp->some_taken;
7232         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7233                 sp->msg_is_complete = 1;
7234         }
7235 re_look:
7236         length = sp->length;
7237         if (sp->msg_is_complete) {
7238                 /* The message is complete */
7239                 to_move = min(length, frag_point);
7240                 if (to_move == length) {
7241                         /* All of it fits in the MTU */
7242                         if (sp->some_taken) {
7243                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7244                                 sp->put_last_out = 1;
7245                         } else {
7246                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7247                                 sp->put_last_out = 1;
7248                         }
7249                 } else {
7250                         /* Not all of it fits, we fragment */
7251                         if (sp->some_taken == 0) {
7252                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7253                         }
7254                         sp->some_taken = 1;
7255                 }
7256         } else {
7257                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7258                 if (to_move) {
7259                         /*-
7260                          * We use a snapshot of length in case it
7261                          * is expanding during the compare.
7262                          */
7263                         uint32_t llen;
7264
7265                         llen = length;
7266                         if (to_move >= llen) {
7267                                 to_move = llen;
7268                                 if (send_lock_up == 0) {
7269                                         /*-
7270                                          * We are taking all of an incomplete msg
7271                                          * thus we need a send lock.
7272                                          */
7273                                         SCTP_TCB_SEND_LOCK(stcb);
7274                                         send_lock_up = 1;
7275                                         if (sp->msg_is_complete) {
7276                                                 /*
7277                                                  * the sender finished the
7278                                                  * msg
7279                                                  */
7280                                                 goto re_look;
7281                                         }
7282                                 }
7283                         }
7284                         if (sp->some_taken == 0) {
7285                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7286                                 sp->some_taken = 1;
7287                         }
7288                 } else {
7289                         /* Nothing to take. */
7290                         if (sp->some_taken) {
7291                                 *locked = 1;
7292                         }
7293                         *giveup = 1;
7294                         to_move = 0;
7295                         goto out_of;
7296                 }
7297         }
7298
7299         /* If we reach here, we can copy out a chunk */
7300         sctp_alloc_a_chunk(stcb, chk);
7301         if (chk == NULL) {
7302                 /* No chunk memory */
7303                 *giveup = 1;
7304                 to_move = 0;
7305                 goto out_of;
7306         }
7307         /*
7308          * Setup for unordered if needed by looking at the user sent info
7309          * flags.
7310          */
7311         if (sp->sinfo_flags & SCTP_UNORDERED) {
7312                 rcv_flags |= SCTP_DATA_UNORDERED;
7313         }
7314         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7315             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7316                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7317         }
7318         /* clear out the chunk before setting up */
7319         memset(chk, 0, sizeof(*chk));
7320         chk->rec.data.rcv_flags = rcv_flags;
7321
7322         if (to_move >= length) {
7323                 /* we think we can steal the whole thing */
7324                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7325                         SCTP_TCB_SEND_LOCK(stcb);
7326                         send_lock_up = 1;
7327                 }
7328                 if (to_move < sp->length) {
7329                         /* bail, it changed */
7330                         goto dont_do_it;
7331                 }
7332                 chk->data = sp->data;
7333                 chk->last_mbuf = sp->tail_mbuf;
7334                 /* register the stealing */
7335                 sp->data = sp->tail_mbuf = NULL;
7336         } else {
7337                 struct mbuf *m;
7338
7339 dont_do_it:
7340                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7341                 chk->last_mbuf = NULL;
7342                 if (chk->data == NULL) {
7343                         sp->some_taken = some_taken;
7344                         sctp_free_a_chunk(stcb, chk, so_locked);
7345                         *bail = 1;
7346                         to_move = 0;
7347                         goto out_of;
7348                 }
7349 #ifdef SCTP_MBUF_LOGGING
7350                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7351                         struct mbuf *mat;
7352
7353                         mat = chk->data;
7354                         while (mat) {
7355                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7356                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7357                                 }
7358                                 mat = SCTP_BUF_NEXT(mat);
7359                         }
7360                 }
7361 #endif
7362                 /* Pull off the data */
7363                 m_adj(sp->data, to_move);
7364                 /* Now lets work our way down and compact it */
7365                 m = sp->data;
7366                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7367                         sp->data = SCTP_BUF_NEXT(m);
7368                         SCTP_BUF_NEXT(m) = NULL;
7369                         if (sp->tail_mbuf == m) {
7370                                 /*-
7371                                  * Freeing tail? TSNH since
7372                                  * we supposedly were taking less
7373                                  * than the sp->length.
7374                                  */
7375 #ifdef INVARIANTS
7376                                 panic("Huh, freing tail? - TSNH");
7377 #else
7378                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7379                                 sp->tail_mbuf = sp->data = NULL;
7380                                 sp->length = 0;
7381 #endif
7382
7383                         }
7384                         sctp_m_free(m);
7385                         m = sp->data;
7386                 }
7387         }
7388         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7389                 chk->copy_by_ref = 1;
7390         } else {
7391                 chk->copy_by_ref = 0;
7392         }
7393         /*
7394          * get last_mbuf and counts of mb useage This is ugly but hopefully
7395          * its only one mbuf.
7396          */
7397         if (chk->last_mbuf == NULL) {
7398                 chk->last_mbuf = chk->data;
7399                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7400                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7401                 }
7402         }
7403         if (to_move > length) {
7404                 /*- This should not happen either
7405                  * since we always lower to_move to the size
7406                  * of sp->length if its larger.
7407                  */
7408 #ifdef INVARIANTS
7409                 panic("Huh, how can to_move be larger?");
7410 #else
7411                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7412                 sp->length = 0;
7413 #endif
7414         } else {
7415                 atomic_subtract_int(&sp->length, to_move);
7416         }
7417         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7418                 /* Not enough room for a chunk header, get some */
7419                 struct mbuf *m;
7420
7421                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7422                 if (m == NULL) {
7423                         /*
7424                          * we're in trouble here. _PREPEND below will free
7425                          * all the data if there is no leading space, so we
7426                          * must put the data back and restore.
7427                          */
7428                         if (send_lock_up == 0) {
7429                                 SCTP_TCB_SEND_LOCK(stcb);
7430                                 send_lock_up = 1;
7431                         }
7432                         if (chk->data == NULL) {
7433                                 /* unsteal the data */
7434                                 sp->data = chk->data;
7435                                 sp->tail_mbuf = chk->last_mbuf;
7436                         } else {
7437                                 struct mbuf *m_tmp;
7438
7439                                 /* reassemble the data */
7440                                 m_tmp = sp->data;
7441                                 sp->data = chk->data;
7442                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7443                         }
7444                         sp->some_taken = some_taken;
7445                         atomic_add_int(&sp->length, to_move);
7446                         chk->data = NULL;
7447                         *bail = 1;
7448                         sctp_free_a_chunk(stcb, chk, so_locked);
7449                         to_move = 0;
7450                         goto out_of;
7451                 } else {
7452                         SCTP_BUF_LEN(m) = 0;
7453                         SCTP_BUF_NEXT(m) = chk->data;
7454                         chk->data = m;
7455                         M_ALIGN(chk->data, 4);
7456                 }
7457         }
7458         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7459         if (chk->data == NULL) {
7460                 /* HELP, TSNH since we assured it would not above? */
7461 #ifdef INVARIANTS
7462                 panic("prepend failes HELP?");
7463 #else
7464                 SCTP_PRINTF("prepend fails HELP?\n");
7465                 sctp_free_a_chunk(stcb, chk, so_locked);
7466 #endif
7467                 *bail = 1;
7468                 to_move = 0;
7469                 goto out_of;
7470         }
7471         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7472         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7473         chk->book_size_scale = 0;
7474         chk->sent = SCTP_DATAGRAM_UNSENT;
7475
7476         chk->flags = 0;
7477         chk->asoc = &stcb->asoc;
7478         chk->pad_inplace = 0;
7479         chk->no_fr_allowed = 0;
7480         chk->rec.data.stream_seq = sp->strseq;
7481         chk->rec.data.stream_number = sp->stream;
7482         chk->rec.data.payloadtype = sp->ppid;
7483         chk->rec.data.context = sp->context;
7484         chk->rec.data.doing_fast_retransmit = 0;
7485
7486         chk->rec.data.timetodrop = sp->ts;
7487         chk->flags = sp->act_flags;
7488
7489         if (sp->net) {
7490                 chk->whoTo = sp->net;
7491                 atomic_add_int(&chk->whoTo->ref_count, 1);
7492         } else
7493                 chk->whoTo = NULL;
7494
7495         if (sp->holds_key_ref) {
7496                 chk->auth_keyid = sp->auth_keyid;
7497                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7498                 chk->holds_key_ref = 1;
7499         }
7500         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7501         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7502                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7503                     (uintptr_t) stcb, sp->length,
7504                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7505                     chk->rec.data.TSN_seq);
7506         }
7507         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7508         /*
7509          * Put the rest of the things in place now. Size was done earlier in
7510          * previous loop prior to padding.
7511          */
7512
7513 #ifdef SCTP_ASOCLOG_OF_TSNS
7514         SCTP_TCB_LOCK_ASSERT(stcb);
7515         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7516                 asoc->tsn_out_at = 0;
7517                 asoc->tsn_out_wrapped = 1;
7518         }
7519         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7520         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7521         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7522         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7523         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7524         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7525         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7526         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7527         asoc->tsn_out_at++;
7528 #endif
7529
7530         dchkh->ch.chunk_type = SCTP_DATA;
7531         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7532         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7533         dchkh->dp.stream_id = htons(strq->stream_no);
7534         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7535         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7536         dchkh->ch.chunk_length = htons(chk->send_size);
7537         /* Now advance the chk->send_size by the actual pad needed. */
7538         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7539                 /* need a pad */
7540                 struct mbuf *lm;
7541                 int pads;
7542
7543                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7544                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7545                         chk->pad_inplace = 1;
7546                 }
7547                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7548                         /* pad added an mbuf */
7549                         chk->last_mbuf = lm;
7550                 }
7551                 chk->send_size += pads;
7552         }
7553         /* We only re-set the policy if it is on */
7554         if (sp->pr_sctp_on) {
7555                 sctp_set_prsctp_policy(sp);
7556                 asoc->pr_sctp_cnt++;
7557                 chk->pr_sctp_on = 1;
7558         } else {
7559                 chk->pr_sctp_on = 0;
7560         }
7561         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7562                 /* All done pull and kill the message */
7563                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7564                 if (sp->put_last_out == 0) {
7565                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7566                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7567                             sp->sender_all_done,
7568                             sp->length,
7569                             sp->msg_is_complete,
7570                             sp->put_last_out,
7571                             send_lock_up);
7572                 }
7573                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7574                         SCTP_TCB_SEND_LOCK(stcb);
7575                         send_lock_up = 1;
7576                 }
7577                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7578                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7579                 if (sp->net) {
7580                         sctp_free_remote_addr(sp->net);
7581                         sp->net = NULL;
7582                 }
7583                 if (sp->data) {
7584                         sctp_m_freem(sp->data);
7585                         sp->data = NULL;
7586                 }
7587                 sctp_free_a_strmoq(stcb, sp, so_locked);
7588
7589                 /* we can't be locked to it */
7590                 *locked = 0;
7591                 stcb->asoc.locked_on_sending = NULL;
7592         } else {
7593                 /* more to go, we are locked */
7594                 *locked = 1;
7595         }
7596         asoc->chunks_on_out_queue++;
7597         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7598         asoc->send_queue_cnt++;
7599 out_of:
7600         if (send_lock_up) {
7601                 SCTP_TCB_SEND_UNLOCK(stcb);
7602         }
7603         return (to_move);
7604 }
7605
7606
7607 static void
7608 sctp_fill_outqueue(struct sctp_tcb *stcb,
7609     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7610 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7611     SCTP_UNUSED
7612 #endif
7613 )
7614 {
7615         struct sctp_association *asoc;
7616         struct sctp_stream_out *strq;
7617         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7618         int locked, giveup;
7619
7620         SCTP_TCB_LOCK_ASSERT(stcb);
7621         asoc = &stcb->asoc;
7622         switch (net->ro._l_addr.sa.sa_family) {
7623 #ifdef INET
7624         case AF_INET:
7625                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7626                 break;
7627 #endif
7628 #ifdef INET6
7629         case AF_INET6:
7630                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7631                 break;
7632 #endif
7633         default:
7634                 /* TSNH */
7635                 goal_mtu = net->mtu;
7636                 break;
7637         }
7638         /* Need an allowance for the data chunk header too */
7639         goal_mtu -= sizeof(struct sctp_data_chunk);
7640
7641         /* must make even word boundary */
7642         goal_mtu &= 0xfffffffc;
7643         if (asoc->locked_on_sending) {
7644                 /* We are stuck on one stream until the message completes. */
7645                 strq = asoc->locked_on_sending;
7646                 locked = 1;
7647         } else {
7648                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7649                 locked = 0;
7650         }
7651         while ((goal_mtu > 0) && strq) {
7652                 giveup = 0;
7653                 bail = 0;
7654                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7655                     &giveup, eeor_mode, &bail, so_locked);
7656                 if (moved_how_much)
7657                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7658
7659                 if (locked) {
7660                         asoc->locked_on_sending = strq;
7661                         if ((moved_how_much == 0) || (giveup) || bail)
7662                                 /* no more to move for now */
7663                                 break;
7664                 } else {
7665                         asoc->locked_on_sending = NULL;
7666                         if ((giveup) || bail) {
7667                                 break;
7668                         }
7669                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7670                         if (strq == NULL) {
7671                                 break;
7672                         }
7673                 }
7674                 total_moved += moved_how_much;
7675                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7676                 goal_mtu &= 0xfffffffc;
7677         }
7678         if (bail)
7679                 *quit_now = 1;
7680
7681         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7682
7683         if (total_moved == 0) {
7684                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7685                     (net == stcb->asoc.primary_destination)) {
7686                         /* ran dry for primary network net */
7687                         SCTP_STAT_INCR(sctps_primary_randry);
7688                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7689                         /* ran dry with CMT on */
7690                         SCTP_STAT_INCR(sctps_cmt_randry);
7691                 }
7692         }
7693 }
7694
7695 void
7696 sctp_fix_ecn_echo(struct sctp_association *asoc)
7697 {
7698         struct sctp_tmit_chunk *chk;
7699
7700         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7701                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7702                         chk->sent = SCTP_DATAGRAM_UNSENT;
7703                 }
7704         }
7705 }
7706
7707 void
7708 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7709 {
7710         struct sctp_association *asoc;
7711         struct sctp_tmit_chunk *chk;
7712         struct sctp_stream_queue_pending *sp;
7713         unsigned int i;
7714
7715         if (net == NULL) {
7716                 return;
7717         }
7718         asoc = &stcb->asoc;
7719         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7720                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7721                         if (sp->net == net) {
7722                                 sctp_free_remote_addr(sp->net);
7723                                 sp->net = NULL;
7724                         }
7725                 }
7726         }
7727         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7728                 if (chk->whoTo == net) {
7729                         sctp_free_remote_addr(chk->whoTo);
7730                         chk->whoTo = NULL;
7731                 }
7732         }
7733 }
7734
7735 int
7736 sctp_med_chunk_output(struct sctp_inpcb *inp,
7737     struct sctp_tcb *stcb,
7738     struct sctp_association *asoc,
7739     int *num_out,
7740     int *reason_code,
7741     int control_only, int from_where,
7742     struct timeval *now, int *now_filled, int frag_point, int so_locked
7743 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7744     SCTP_UNUSED
7745 #endif
7746 )
7747 {
7748         /*
7749          * Ok this is the generic chunk service queue. we must do the
7750          * following: - Service the stream queue that is next, moving any
7751          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7752          * LAST to the out queue in one pass) and assigning TSN's - Check to
7753          * see if the cwnd/rwnd allows any output, if so we go ahead and
7754          * fomulate and send the low level chunks. Making sure to combine
7755          * any control in the control chunk queue also.
7756          */
7757         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7758         struct mbuf *outchain, *endoutchain;
7759         struct sctp_tmit_chunk *chk, *nchk;
7760
7761         /* temp arrays for unlinking */
7762         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7763         int no_fragmentflg, error;
7764         unsigned int max_rwnd_per_dest, max_send_per_dest;
7765         int one_chunk, hbflag, skip_data_for_this_net;
7766         int asconf, cookie, no_out_cnt;
7767         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7768         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7769         int tsns_sent = 0;
7770         uint32_t auth_offset = 0;
7771         struct sctp_auth_chunk *auth = NULL;
7772         uint16_t auth_keyid;
7773         int override_ok = 1;
7774         int skip_fill_up = 0;
7775         int data_auth_reqd = 0;
7776
7777         /*
7778          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7779          * destination.
7780          */
7781         int quit_now = 0;
7782
7783         *num_out = 0;
7784         auth_keyid = stcb->asoc.authinfo.active_keyid;
7785
7786         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7787             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7788             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7789                 eeor_mode = 1;
7790         } else {
7791                 eeor_mode = 0;
7792         }
7793         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7794         /*
7795          * First lets prime the pump. For each destination, if there is room
7796          * in the flight size, attempt to pull an MTU's worth out of the
7797          * stream queues into the general send_queue
7798          */
7799 #ifdef SCTP_AUDITING_ENABLED
7800         sctp_audit_log(0xC2, 2);
7801 #endif
7802         SCTP_TCB_LOCK_ASSERT(stcb);
7803         hbflag = 0;
7804         if ((control_only) || (asoc->stream_reset_outstanding))
7805                 no_data_chunks = 1;
7806         else
7807                 no_data_chunks = 0;
7808
7809         /* Nothing to possible to send? */
7810         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7811             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7812             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7813             TAILQ_EMPTY(&asoc->send_queue) &&
7814             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7815 nothing_to_send:
7816                 *reason_code = 9;
7817                 return (0);
7818         }
7819         if (asoc->peers_rwnd == 0) {
7820                 /* No room in peers rwnd */
7821                 *reason_code = 1;
7822                 if (asoc->total_flight > 0) {
7823                         /* we are allowed one chunk in flight */
7824                         no_data_chunks = 1;
7825                 }
7826         }
7827         if (stcb->asoc.ecn_echo_cnt_onq) {
7828                 /* Record where a sack goes, if any */
7829                 if (no_data_chunks &&
7830                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7831                         /* Nothing but ECNe to send - we don't do that */
7832                         goto nothing_to_send;
7833                 }
7834                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7835                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7836                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7837                                 sack_goes_to = chk->whoTo;
7838                                 break;
7839                         }
7840                 }
7841         }
7842         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7843         if (stcb->sctp_socket)
7844                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7845         else
7846                 max_send_per_dest = 0;
7847         if (no_data_chunks == 0) {
7848                 /* How many non-directed chunks are there? */
7849                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7850                         if (chk->whoTo == NULL) {
7851                                 /*
7852                                  * We already have non-directed chunks on
7853                                  * the queue, no need to do a fill-up.
7854                                  */
7855                                 skip_fill_up = 1;
7856                                 break;
7857                         }
7858                 }
7859
7860         }
7861         if ((no_data_chunks == 0) &&
7862             (skip_fill_up == 0) &&
7863             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7864                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7865                         /*
7866                          * This for loop we are in takes in each net, if
7867                          * its's got space in cwnd and has data sent to it
7868                          * (when CMT is off) then it calls
7869                          * sctp_fill_outqueue for the net. This gets data on
7870                          * the send queue for that network.
7871                          *
7872                          * In sctp_fill_outqueue TSN's are assigned and data is
7873                          * copied out of the stream buffers. Note mostly
7874                          * copy by reference (we hope).
7875                          */
7876                         net->window_probe = 0;
7877                         if ((net != stcb->asoc.alternate) &&
7878                             ((net->dest_state & SCTP_ADDR_PF) ||
7879                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7880                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7881                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7882                                         sctp_log_cwnd(stcb, net, 1,
7883                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7884                                 }
7885                                 continue;
7886                         }
7887                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7888                             (net->flight_size == 0)) {
7889                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7890                         }
7891                         if (net->flight_size >= net->cwnd) {
7892                                 /* skip this network, no room - can't fill */
7893                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7894                                         sctp_log_cwnd(stcb, net, 3,
7895                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7896                                 }
7897                                 continue;
7898                         }
7899                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7900                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7901                         }
7902                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7903                         if (quit_now) {
7904                                 /* memory alloc failure */
7905                                 no_data_chunks = 1;
7906                                 break;
7907                         }
7908                 }
7909         }
7910         /* now service each destination and send out what we can for it */
7911         /* Nothing to send? */
7912         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7913             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7914             TAILQ_EMPTY(&asoc->send_queue)) {
7915                 *reason_code = 8;
7916                 return (0);
7917         }
7918         if (asoc->sctp_cmt_on_off > 0) {
7919                 /* get the last start point */
7920                 start_at = asoc->last_net_cmt_send_started;
7921                 if (start_at == NULL) {
7922                         /* null so to beginning */
7923                         start_at = TAILQ_FIRST(&asoc->nets);
7924                 } else {
7925                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7926                         if (start_at == NULL) {
7927                                 start_at = TAILQ_FIRST(&asoc->nets);
7928                         }
7929                 }
7930                 asoc->last_net_cmt_send_started = start_at;
7931         } else {
7932                 start_at = TAILQ_FIRST(&asoc->nets);
7933         }
7934         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7935                 if (chk->whoTo == NULL) {
7936                         if (asoc->alternate) {
7937                                 chk->whoTo = asoc->alternate;
7938                         } else {
7939                                 chk->whoTo = asoc->primary_destination;
7940                         }
7941                         atomic_add_int(&chk->whoTo->ref_count, 1);
7942                 }
7943         }
7944         old_start_at = NULL;
7945 again_one_more_time:
7946         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7947                 /* how much can we send? */
7948                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7949                 if (old_start_at && (old_start_at == net)) {
7950                         /* through list ocmpletely. */
7951                         break;
7952                 }
7953                 tsns_sent = 0xa;
7954                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7955                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7956                     (net->flight_size >= net->cwnd)) {
7957                         /*
7958                          * Nothing on control or asconf and flight is full,
7959                          * we can skip even in the CMT case.
7960                          */
7961                         continue;
7962                 }
7963                 bundle_at = 0;
7964                 endoutchain = outchain = NULL;
7965                 no_fragmentflg = 1;
7966                 one_chunk = 0;
7967                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7968                         skip_data_for_this_net = 1;
7969                 } else {
7970                         skip_data_for_this_net = 0;
7971                 }
7972                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7973                         /*
7974                          * if we have a route and an ifp check to see if we
7975                          * have room to send to this guy
7976                          */
7977                         struct ifnet *ifp;
7978
7979                         ifp = net->ro.ro_rt->rt_ifp;
7980                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7981                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7982                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7983                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7984                                 }
7985                                 continue;
7986                         }
7987                 }
7988                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7989 #ifdef INET
7990                 case AF_INET:
7991                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7992                         break;
7993 #endif
7994 #ifdef INET6
7995                 case AF_INET6:
7996                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7997                         break;
7998 #endif
7999                 default:
8000                         /* TSNH */
8001                         mtu = net->mtu;
8002                         break;
8003                 }
8004                 mx_mtu = mtu;
8005                 to_out = 0;
8006                 if (mtu > asoc->peers_rwnd) {
8007                         if (asoc->total_flight > 0) {
8008                                 /* We have a packet in flight somewhere */
8009                                 r_mtu = asoc->peers_rwnd;
8010                         } else {
8011                                 /* We are always allowed to send one MTU out */
8012                                 one_chunk = 1;
8013                                 r_mtu = mtu;
8014                         }
8015                 } else {
8016                         r_mtu = mtu;
8017                 }
8018                 /************************/
8019                 /* ASCONF transmission */
8020                 /************************/
8021                 /* Now first lets go through the asconf queue */
8022                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8023                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8024                                 continue;
8025                         }
8026                         if (chk->whoTo == NULL) {
8027                                 if (asoc->alternate == NULL) {
8028                                         if (asoc->primary_destination != net) {
8029                                                 break;
8030                                         }
8031                                 } else {
8032                                         if (asoc->alternate != net) {
8033                                                 break;
8034                                         }
8035                                 }
8036                         } else {
8037                                 if (chk->whoTo != net) {
8038                                         break;
8039                                 }
8040                         }
8041                         if (chk->data == NULL) {
8042                                 break;
8043                         }
8044                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8045                             chk->sent != SCTP_DATAGRAM_RESEND) {
8046                                 break;
8047                         }
8048                         /*
8049                          * if no AUTH is yet included and this chunk
8050                          * requires it, make sure to account for it.  We
8051                          * don't apply the size until the AUTH chunk is
8052                          * actually added below in case there is no room for
8053                          * this chunk. NOTE: we overload the use of "omtu"
8054                          * here
8055                          */
8056                         if ((auth == NULL) &&
8057                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8058                             stcb->asoc.peer_auth_chunks)) {
8059                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8060                         } else
8061                                 omtu = 0;
8062                         /* Here we do NOT factor the r_mtu */
8063                         if ((chk->send_size < (int)(mtu - omtu)) ||
8064                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8065                                 /*
8066                                  * We probably should glom the mbuf chain
8067                                  * from the chk->data for control but the
8068                                  * problem is it becomes yet one more level
8069                                  * of tracking to do if for some reason
8070                                  * output fails. Then I have got to
8071                                  * reconstruct the merged control chain.. el
8072                                  * yucko.. for now we take the easy way and
8073                                  * do the copy
8074                                  */
8075                                 /*
8076                                  * Add an AUTH chunk, if chunk requires it
8077                                  * save the offset into the chain for AUTH
8078                                  */
8079                                 if ((auth == NULL) &&
8080                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8081                                     stcb->asoc.peer_auth_chunks))) {
8082                                         outchain = sctp_add_auth_chunk(outchain,
8083                                             &endoutchain,
8084                                             &auth,
8085                                             &auth_offset,
8086                                             stcb,
8087                                             chk->rec.chunk_id.id);
8088                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8089                                 }
8090                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8091                                     (int)chk->rec.chunk_id.can_take_data,
8092                                     chk->send_size, chk->copy_by_ref);
8093                                 if (outchain == NULL) {
8094                                         *reason_code = 8;
8095                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8096                                         return (ENOMEM);
8097                                 }
8098                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8099                                 /* update our MTU size */
8100                                 if (mtu > (chk->send_size + omtu))
8101                                         mtu -= (chk->send_size + omtu);
8102                                 else
8103                                         mtu = 0;
8104                                 to_out += (chk->send_size + omtu);
8105                                 /* Do clear IP_DF ? */
8106                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8107                                         no_fragmentflg = 0;
8108                                 }
8109                                 if (chk->rec.chunk_id.can_take_data)
8110                                         chk->data = NULL;
8111                                 /*
8112                                  * set hb flag since we can use these for
8113                                  * RTO
8114                                  */
8115                                 hbflag = 1;
8116                                 asconf = 1;
8117                                 /*
8118                                  * should sysctl this: don't bundle data
8119                                  * with ASCONF since it requires AUTH
8120                                  */
8121                                 no_data_chunks = 1;
8122                                 chk->sent = SCTP_DATAGRAM_SENT;
8123                                 if (chk->whoTo == NULL) {
8124                                         chk->whoTo = net;
8125                                         atomic_add_int(&net->ref_count, 1);
8126                                 }
8127                                 chk->snd_count++;
8128                                 if (mtu == 0) {
8129                                         /*
8130                                          * Ok we are out of room but we can
8131                                          * output without effecting the
8132                                          * flight size since this little guy
8133                                          * is a control only packet.
8134                                          */
8135                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8136                                         /*
8137                                          * do NOT clear the asconf flag as
8138                                          * it is used to do appropriate
8139                                          * source address selection.
8140                                          */
8141                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8142                                             (struct sockaddr *)&net->ro._l_addr,
8143                                             outchain, auth_offset, auth,
8144                                             stcb->asoc.authinfo.active_keyid,
8145                                             no_fragmentflg, 0, asconf,
8146                                             inp->sctp_lport, stcb->rport,
8147                                             htonl(stcb->asoc.peer_vtag),
8148                                             net->port, so_locked, NULL, NULL))) {
8149                                                 if (error == ENOBUFS) {
8150                                                         asoc->ifp_had_enobuf = 1;
8151                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8152                                                 }
8153                                                 if (from_where == 0) {
8154                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8155                                                 }
8156                                                 if (*now_filled == 0) {
8157                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8158                                                         *now_filled = 1;
8159                                                         *now = net->last_sent_time;
8160                                                 } else {
8161                                                         net->last_sent_time = *now;
8162                                                 }
8163                                                 hbflag = 0;
8164                                                 /* error, could not output */
8165                                                 if (error == EHOSTUNREACH) {
8166                                                         /*
8167                                                          * Destination went
8168                                                          * unreachable
8169                                                          * during this send
8170                                                          */
8171                                                         sctp_move_chunks_from_net(stcb, net);
8172                                                 }
8173                                                 *reason_code = 7;
8174                                                 continue;
8175                                         } else
8176                                                 asoc->ifp_had_enobuf = 0;
8177                                         if (*now_filled == 0) {
8178                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8179                                                 *now_filled = 1;
8180                                                 *now = net->last_sent_time;
8181                                         } else {
8182                                                 net->last_sent_time = *now;
8183                                         }
8184                                         hbflag = 0;
8185                                         /*
8186                                          * increase the number we sent, if a
8187                                          * cookie is sent we don't tell them
8188                                          * any was sent out.
8189                                          */
8190                                         outchain = endoutchain = NULL;
8191                                         auth = NULL;
8192                                         auth_offset = 0;
8193                                         if (!no_out_cnt)
8194                                                 *num_out += ctl_cnt;
8195                                         /* recalc a clean slate and setup */
8196                                         switch (net->ro._l_addr.sa.sa_family) {
8197 #ifdef INET
8198                                         case AF_INET:
8199                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8200                                                 break;
8201 #endif
8202 #ifdef INET6
8203                                         case AF_INET6:
8204                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8205                                                 break;
8206 #endif
8207                                         default:
8208                                                 /* TSNH */
8209                                                 mtu = net->mtu;
8210                                                 break;
8211                                         }
8212                                         to_out = 0;
8213                                         no_fragmentflg = 1;
8214                                 }
8215                         }
8216                 }
8217                 /************************/
8218                 /* Control transmission */
8219                 /************************/
8220                 /* Now first lets go through the control queue */
8221                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8222                         if ((sack_goes_to) &&
8223                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8224                             (chk->whoTo != sack_goes_to)) {
8225                                 /*
8226                                  * if we have a sack in queue, and we are
8227                                  * looking at an ecn echo that is NOT queued
8228                                  * to where the sack is going..
8229                                  */
8230                                 if (chk->whoTo == net) {
8231                                         /*
8232                                          * Don't transmit it to where its
8233                                          * going (current net)
8234                                          */
8235                                         continue;
8236                                 } else if (sack_goes_to == net) {
8237                                         /*
8238                                          * But do transmit it to this
8239                                          * address
8240                                          */
8241                                         goto skip_net_check;
8242                                 }
8243                         }
8244                         if (chk->whoTo == NULL) {
8245                                 if (asoc->alternate == NULL) {
8246                                         if (asoc->primary_destination != net) {
8247                                                 continue;
8248                                         }
8249                                 } else {
8250                                         if (asoc->alternate != net) {
8251                                                 continue;
8252                                         }
8253                                 }
8254                         } else {
8255                                 if (chk->whoTo != net) {
8256                                         continue;
8257                                 }
8258                         }
8259         skip_net_check:
8260                         if (chk->data == NULL) {
8261                                 continue;
8262                         }
8263                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8264                                 /*
8265                                  * It must be unsent. Cookies and ASCONF's
8266                                  * hang around but there timers will force
8267                                  * when marked for resend.
8268                                  */
8269                                 continue;
8270                         }
8271                         /*
8272                          * if no AUTH is yet included and this chunk
8273                          * requires it, make sure to account for it.  We
8274                          * don't apply the size until the AUTH chunk is
8275                          * actually added below in case there is no room for
8276                          * this chunk. NOTE: we overload the use of "omtu"
8277                          * here
8278                          */
8279                         if ((auth == NULL) &&
8280                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8281                             stcb->asoc.peer_auth_chunks)) {
8282                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8283                         } else
8284                                 omtu = 0;
8285                         /* Here we do NOT factor the r_mtu */
8286                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8287                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8288                                 /*
8289                                  * We probably should glom the mbuf chain
8290                                  * from the chk->data for control but the
8291                                  * problem is it becomes yet one more level
8292                                  * of tracking to do if for some reason
8293                                  * output fails. Then I have got to
8294                                  * reconstruct the merged control chain.. el
8295                                  * yucko.. for now we take the easy way and
8296                                  * do the copy
8297                                  */
8298                                 /*
8299                                  * Add an AUTH chunk, if chunk requires it
8300                                  * save the offset into the chain for AUTH
8301                                  */
8302                                 if ((auth == NULL) &&
8303                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8304                                     stcb->asoc.peer_auth_chunks))) {
8305                                         outchain = sctp_add_auth_chunk(outchain,
8306                                             &endoutchain,
8307                                             &auth,
8308                                             &auth_offset,
8309                                             stcb,
8310                                             chk->rec.chunk_id.id);
8311                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8312                                 }
8313                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8314                                     (int)chk->rec.chunk_id.can_take_data,
8315                                     chk->send_size, chk->copy_by_ref);
8316                                 if (outchain == NULL) {
8317                                         *reason_code = 8;
8318                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8319                                         return (ENOMEM);
8320                                 }
8321                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8322                                 /* update our MTU size */
8323                                 if (mtu > (chk->send_size + omtu))
8324                                         mtu -= (chk->send_size + omtu);
8325                                 else
8326                                         mtu = 0;
8327                                 to_out += (chk->send_size + omtu);
8328                                 /* Do clear IP_DF ? */
8329                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8330                                         no_fragmentflg = 0;
8331                                 }
8332                                 if (chk->rec.chunk_id.can_take_data)
8333                                         chk->data = NULL;
8334                                 /* Mark things to be removed, if needed */
8335                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8336                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8337                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8338                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8339                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8340                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8341                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8342                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8343                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8344                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8345                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8346                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8347                                                 hbflag = 1;
8348                                         }
8349                                         /* remove these chunks at the end */
8350                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8351                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8352                                                 /* turn off the timer */
8353                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8354                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8355                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8356                                                 }
8357                                         }
8358                                         ctl_cnt++;
8359                                 } else {
8360                                         /*
8361                                          * Other chunks, since they have
8362                                          * timers running (i.e. COOKIE) we
8363                                          * just "trust" that it gets sent or
8364                                          * retransmitted.
8365                                          */
8366                                         ctl_cnt++;
8367                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8368                                                 cookie = 1;
8369                                                 no_out_cnt = 1;
8370                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8371                                                 /*
8372                                                  * Increment ecne send count
8373                                                  * here this means we may be
8374                                                  * over-zealous in our
8375                                                  * counting if the send
8376                                                  * fails, but its the best
8377                                                  * place to do it (we used
8378                                                  * to do it in the queue of
8379                                                  * the chunk, but that did
8380                                                  * not tell how many times
8381                                                  * it was sent.
8382                                                  */
8383                                                 SCTP_STAT_INCR(sctps_sendecne);
8384                                         }
8385                                         chk->sent = SCTP_DATAGRAM_SENT;
8386                                         if (chk->whoTo == NULL) {
8387                                                 chk->whoTo = net;
8388                                                 atomic_add_int(&net->ref_count, 1);
8389                                         }
8390                                         chk->snd_count++;
8391                                 }
8392                                 if (mtu == 0) {
8393                                         /*
8394                                          * Ok we are out of room but we can
8395                                          * output without effecting the
8396                                          * flight size since this little guy
8397                                          * is a control only packet.
8398                                          */
8399                                         if (asconf) {
8400                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8401                                                 /*
8402                                                  * do NOT clear the asconf
8403                                                  * flag as it is used to do
8404                                                  * appropriate source
8405                                                  * address selection.
8406                                                  */
8407                                         }
8408                                         if (cookie) {
8409                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8410                                                 cookie = 0;
8411                                         }
8412                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8413                                             (struct sockaddr *)&net->ro._l_addr,
8414                                             outchain,
8415                                             auth_offset, auth,
8416                                             stcb->asoc.authinfo.active_keyid,
8417                                             no_fragmentflg, 0, asconf,
8418                                             inp->sctp_lport, stcb->rport,
8419                                             htonl(stcb->asoc.peer_vtag),
8420                                             net->port, so_locked, NULL, NULL))) {
8421                                                 if (error == ENOBUFS) {
8422                                                         asoc->ifp_had_enobuf = 1;
8423                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8424                                                 }
8425                                                 if (from_where == 0) {
8426                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8427                                                 }
8428                                                 /* error, could not output */
8429                                                 if (hbflag) {
8430                                                         if (*now_filled == 0) {
8431                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8432                                                                 *now_filled = 1;
8433                                                                 *now = net->last_sent_time;
8434                                                         } else {
8435                                                                 net->last_sent_time = *now;
8436                                                         }
8437                                                         hbflag = 0;
8438                                                 }
8439                                                 if (error == EHOSTUNREACH) {
8440                                                         /*
8441                                                          * Destination went
8442                                                          * unreachable
8443                                                          * during this send
8444                                                          */
8445                                                         sctp_move_chunks_from_net(stcb, net);
8446                                                 }
8447                                                 *reason_code = 7;
8448                                                 continue;
8449                                         } else
8450                                                 asoc->ifp_had_enobuf = 0;
8451                                         /* Only HB or ASCONF advances time */
8452                                         if (hbflag) {
8453                                                 if (*now_filled == 0) {
8454                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8455                                                         *now_filled = 1;
8456                                                         *now = net->last_sent_time;
8457                                                 } else {
8458                                                         net->last_sent_time = *now;
8459                                                 }
8460                                                 hbflag = 0;
8461                                         }
8462                                         /*
8463                                          * increase the number we sent, if a
8464                                          * cookie is sent we don't tell them
8465                                          * any was sent out.
8466                                          */
8467                                         outchain = endoutchain = NULL;
8468                                         auth = NULL;
8469                                         auth_offset = 0;
8470                                         if (!no_out_cnt)
8471                                                 *num_out += ctl_cnt;
8472                                         /* recalc a clean slate and setup */
8473                                         switch (net->ro._l_addr.sa.sa_family) {
8474 #ifdef INET
8475                                         case AF_INET:
8476                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8477                                                 break;
8478 #endif
8479 #ifdef INET6
8480                                         case AF_INET6:
8481                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8482                                                 break;
8483 #endif
8484                                         default:
8485                                                 /* TSNH */
8486                                                 mtu = net->mtu;
8487                                                 break;
8488                                         }
8489                                         to_out = 0;
8490                                         no_fragmentflg = 1;
8491                                 }
8492                         }
8493                 }
8494                 /* JRI: if dest is in PF state, do not send data to it */
8495                 if ((asoc->sctp_cmt_on_off > 0) &&
8496                     (net != stcb->asoc.alternate) &&
8497                     (net->dest_state & SCTP_ADDR_PF)) {
8498                         goto no_data_fill;
8499                 }
8500                 if (net->flight_size >= net->cwnd) {
8501                         goto no_data_fill;
8502                 }
8503                 if ((asoc->sctp_cmt_on_off > 0) &&
8504                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8505                     (net->flight_size > max_rwnd_per_dest)) {
8506                         goto no_data_fill;
8507                 }
8508                 /*
8509                  * We need a specific accounting for the usage of the send
8510                  * buffer. We also need to check the number of messages per
8511                  * net. For now, this is better than nothing and it disabled
8512                  * by default...
8513                  */
8514                 if ((asoc->sctp_cmt_on_off > 0) &&
8515                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8516                     (max_send_per_dest > 0) &&
8517                     (net->flight_size > max_send_per_dest)) {
8518                         goto no_data_fill;
8519                 }
8520                 /*********************/
8521                 /* Data transmission */
8522                 /*********************/
8523                 /*
8524                  * if AUTH for DATA is required and no AUTH has been added
8525                  * yet, account for this in the mtu now... if no data can be
8526                  * bundled, this adjustment won't matter anyways since the
8527                  * packet will be going out...
8528                  */
8529                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8530                     stcb->asoc.peer_auth_chunks);
8531                 if (data_auth_reqd && (auth == NULL)) {
8532                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8533                 }
8534                 /* now lets add any data within the MTU constraints */
8535                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8536                 case AF_INET:
8537                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8538                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8539                         else
8540                                 omtu = 0;
8541                         break;
8542 #ifdef INET6
8543                 case AF_INET6:
8544                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8545                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8546                         else
8547                                 omtu = 0;
8548                         break;
8549 #endif
8550                 default:
8551                         /* TSNH */
8552                         omtu = 0;
8553                         break;
8554                 }
8555                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8556                     (skip_data_for_this_net == 0)) ||
8557                     (cookie)) {
8558                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8559                                 if (no_data_chunks) {
8560                                         /* let only control go out */
8561                                         *reason_code = 1;
8562                                         break;
8563                                 }
8564                                 if (net->flight_size >= net->cwnd) {
8565                                         /* skip this net, no room for data */
8566                                         *reason_code = 2;
8567                                         break;
8568                                 }
8569                                 if ((chk->whoTo != NULL) &&
8570                                     (chk->whoTo != net)) {
8571                                         /* Don't send the chunk on this net */
8572                                         continue;
8573                                 }
8574                                 if (asoc->sctp_cmt_on_off == 0) {
8575                                         if ((asoc->alternate) &&
8576                                             (asoc->alternate != net) &&
8577                                             (chk->whoTo == NULL)) {
8578                                                 continue;
8579                                         } else if ((net != asoc->primary_destination) &&
8580                                                     (asoc->alternate == NULL) &&
8581                                             (chk->whoTo == NULL)) {
8582                                                 continue;
8583                                         }
8584                                 }
8585                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8586                                         /*-
8587                                          * strange, we have a chunk that is
8588                                          * to big for its destination and
8589                                          * yet no fragment ok flag.
8590                                          * Something went wrong when the
8591                                          * PMTU changed...we did not mark
8592                                          * this chunk for some reason?? I
8593                                          * will fix it here by letting IP
8594                                          * fragment it for now and printing
8595                                          * a warning. This really should not
8596                                          * happen ...
8597                                          */
8598                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8599                                             chk->send_size, mtu);
8600                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8601                                 }
8602                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8603                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8604                                         struct sctp_data_chunk *dchkh;
8605
8606                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8607                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8608                                 }
8609                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8610                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8611                                         /* ok we will add this one */
8612
8613                                         /*
8614                                          * Add an AUTH chunk, if chunk
8615                                          * requires it, save the offset into
8616                                          * the chain for AUTH
8617                                          */
8618                                         if (data_auth_reqd) {
8619                                                 if (auth == NULL) {
8620                                                         outchain = sctp_add_auth_chunk(outchain,
8621                                                             &endoutchain,
8622                                                             &auth,
8623                                                             &auth_offset,
8624                                                             stcb,
8625                                                             SCTP_DATA);
8626                                                         auth_keyid = chk->auth_keyid;
8627                                                         override_ok = 0;
8628                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8629                                                 } else if (override_ok) {
8630                                                         /*
8631                                                          * use this data's
8632                                                          * keyid
8633                                                          */
8634                                                         auth_keyid = chk->auth_keyid;
8635                                                         override_ok = 0;
8636                                                 } else if (auth_keyid != chk->auth_keyid) {
8637                                                         /*
8638                                                          * different keyid,
8639                                                          * so done bundling
8640                                                          */
8641                                                         break;
8642                                                 }
8643                                         }
8644                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8645                                             chk->send_size, chk->copy_by_ref);
8646                                         if (outchain == NULL) {
8647                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8648                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8649                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8650                                                 }
8651                                                 *reason_code = 3;
8652                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8653                                                 return (ENOMEM);
8654                                         }
8655                                         /* upate our MTU size */
8656                                         /* Do clear IP_DF ? */
8657                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8658                                                 no_fragmentflg = 0;
8659                                         }
8660                                         /* unsigned subtraction of mtu */
8661                                         if (mtu > chk->send_size)
8662                                                 mtu -= chk->send_size;
8663                                         else
8664                                                 mtu = 0;
8665                                         /* unsigned subtraction of r_mtu */
8666                                         if (r_mtu > chk->send_size)
8667                                                 r_mtu -= chk->send_size;
8668                                         else
8669                                                 r_mtu = 0;
8670
8671                                         to_out += chk->send_size;
8672                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8673 #ifdef INVARIANTS
8674                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8675 #else
8676                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8677                                                     mx_mtu, to_out);
8678 #endif
8679                                         }
8680                                         chk->window_probe = 0;
8681                                         data_list[bundle_at++] = chk;
8682                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8683                                                 break;
8684                                         }
8685                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8686                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8687                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8688                                                 } else {
8689                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8690                                                 }
8691                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8692                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8693                                                         /*
8694                                                          * Count number of
8695                                                          * user msg's that
8696                                                          * were fragmented
8697                                                          * we do this by
8698                                                          * counting when we
8699                                                          * see a LAST
8700                                                          * fragment only.
8701                                                          */
8702                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8703                                         }
8704                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8705                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8706                                                         data_list[0]->window_probe = 1;
8707                                                         net->window_probe = 1;
8708                                                 }
8709                                                 break;
8710                                         }
8711                                 } else {
8712                                         /*
8713                                          * Must be sent in order of the
8714                                          * TSN's (on a network)
8715                                          */
8716                                         break;
8717                                 }
8718                         }       /* for (chunk gather loop for this net) */
8719                 }               /* if asoc.state OPEN */
8720 no_data_fill:
8721                 /* Is there something to send for this destination? */
8722                 if (outchain) {
8723                         /* We may need to start a control timer or two */
8724                         if (asconf) {
8725                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8726                                     stcb, net);
8727                                 /*
8728                                  * do NOT clear the asconf flag as it is
8729                                  * used to do appropriate source address
8730                                  * selection.
8731                                  */
8732                         }
8733                         if (cookie) {
8734                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8735                                 cookie = 0;
8736                         }
8737                         /* must start a send timer if data is being sent */
8738                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8739                                 /*
8740                                  * no timer running on this destination
8741                                  * restart it.
8742                                  */
8743                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8744                         }
8745                         /* Now send it, if there is anything to send :> */
8746                         if ((error = sctp_lowlevel_chunk_output(inp,
8747                             stcb,
8748                             net,
8749                             (struct sockaddr *)&net->ro._l_addr,
8750                             outchain,
8751                             auth_offset,
8752                             auth,
8753                             auth_keyid,
8754                             no_fragmentflg,
8755                             bundle_at,
8756                             asconf,
8757                             inp->sctp_lport, stcb->rport,
8758                             htonl(stcb->asoc.peer_vtag),
8759                             net->port, so_locked, NULL, NULL))) {
8760                                 /* error, we could not output */
8761                                 if (error == ENOBUFS) {
8762                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8763                                         asoc->ifp_had_enobuf = 1;
8764                                 }
8765                                 if (from_where == 0) {
8766                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8767                                 }
8768                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8769                                 if (hbflag) {
8770                                         if (*now_filled == 0) {
8771                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8772                                                 *now_filled = 1;
8773                                                 *now = net->last_sent_time;
8774                                         } else {
8775                                                 net->last_sent_time = *now;
8776                                         }
8777                                         hbflag = 0;
8778                                 }
8779                                 if (error == EHOSTUNREACH) {
8780                                         /*
8781                                          * Destination went unreachable
8782                                          * during this send
8783                                          */
8784                                         sctp_move_chunks_from_net(stcb, net);
8785                                 }
8786                                 *reason_code = 6;
8787                                 /*-
8788                                  * I add this line to be paranoid. As far as
8789                                  * I can tell the continue, takes us back to
8790                                  * the top of the for, but just to make sure
8791                                  * I will reset these again here.
8792                                  */
8793                                 ctl_cnt = bundle_at = 0;
8794                                 continue;       /* This takes us back to the
8795                                                  * for() for the nets. */
8796                         } else {
8797                                 asoc->ifp_had_enobuf = 0;
8798                         }
8799                         endoutchain = NULL;
8800                         auth = NULL;
8801                         auth_offset = 0;
8802                         if (bundle_at || hbflag) {
8803                                 /* For data/asconf and hb set time */
8804                                 if (*now_filled == 0) {
8805                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8806                                         *now_filled = 1;
8807                                         *now = net->last_sent_time;
8808                                 } else {
8809                                         net->last_sent_time = *now;
8810                                 }
8811                         }
8812                         if (!no_out_cnt) {
8813                                 *num_out += (ctl_cnt + bundle_at);
8814                         }
8815                         if (bundle_at) {
8816                                 /* setup for a RTO measurement */
8817                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8818                                 /* fill time if not already filled */
8819                                 if (*now_filled == 0) {
8820                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8821                                         *now_filled = 1;
8822                                         *now = asoc->time_last_sent;
8823                                 } else {
8824                                         asoc->time_last_sent = *now;
8825                                 }
8826                                 if (net->rto_needed) {
8827                                         data_list[0]->do_rtt = 1;
8828                                         net->rto_needed = 0;
8829                                 }
8830                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8831                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8832                         }
8833                         if (one_chunk) {
8834                                 break;
8835                         }
8836                 }
8837                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8838                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8839                 }
8840         }
8841         if (old_start_at == NULL) {
8842                 old_start_at = start_at;
8843                 start_at = TAILQ_FIRST(&asoc->nets);
8844                 if (old_start_at)
8845                         goto again_one_more_time;
8846         }
8847         /*
8848          * At the end there should be no NON timed chunks hanging on this
8849          * queue.
8850          */
8851         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8852                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8853         }
8854         if ((*num_out == 0) && (*reason_code == 0)) {
8855                 *reason_code = 4;
8856         } else {
8857                 *reason_code = 5;
8858         }
8859         sctp_clean_up_ctl(stcb, asoc, so_locked);
8860         return (0);
8861 }
8862
8863 void
8864 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8865 {
8866         /*-
8867          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8868          * the control chunk queue.
8869          */
8870         struct sctp_chunkhdr *hdr;
8871         struct sctp_tmit_chunk *chk;
8872         struct mbuf *mat;
8873
8874         SCTP_TCB_LOCK_ASSERT(stcb);
8875         sctp_alloc_a_chunk(stcb, chk);
8876         if (chk == NULL) {
8877                 /* no memory */
8878                 sctp_m_freem(op_err);
8879                 return;
8880         }
8881         chk->copy_by_ref = 0;
8882         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8883         if (op_err == NULL) {
8884                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8885                 return;
8886         }
8887         chk->send_size = 0;
8888         mat = op_err;
8889         while (mat != NULL) {
8890                 chk->send_size += SCTP_BUF_LEN(mat);
8891                 mat = SCTP_BUF_NEXT(mat);
8892         }
8893         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8894         chk->rec.chunk_id.can_take_data = 1;
8895         chk->sent = SCTP_DATAGRAM_UNSENT;
8896         chk->snd_count = 0;
8897         chk->flags = 0;
8898         chk->asoc = &stcb->asoc;
8899         chk->data = op_err;
8900         chk->whoTo = NULL;
8901         hdr = mtod(op_err, struct sctp_chunkhdr *);
8902         hdr->chunk_type = SCTP_OPERATION_ERROR;
8903         hdr->chunk_flags = 0;
8904         hdr->chunk_length = htons(chk->send_size);
8905         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8906             chk,
8907             sctp_next);
8908         chk->asoc->ctrl_queue_cnt++;
8909 }
8910
8911 int
8912 sctp_send_cookie_echo(struct mbuf *m,
8913     int offset,
8914     struct sctp_tcb *stcb,
8915     struct sctp_nets *net)
8916 {
8917         /*-
8918          * pull out the cookie and put it at the front of the control chunk
8919          * queue.
8920          */
8921         int at;
8922         struct mbuf *cookie;
8923         struct sctp_paramhdr parm, *phdr;
8924         struct sctp_chunkhdr *hdr;
8925         struct sctp_tmit_chunk *chk;
8926         uint16_t ptype, plen;
8927
8928         /* First find the cookie in the param area */
8929         cookie = NULL;
8930         at = offset + sizeof(struct sctp_init_chunk);
8931
8932         SCTP_TCB_LOCK_ASSERT(stcb);
8933         do {
8934                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8935                 if (phdr == NULL) {
8936                         return (-3);
8937                 }
8938                 ptype = ntohs(phdr->param_type);
8939                 plen = ntohs(phdr->param_length);
8940                 if (ptype == SCTP_STATE_COOKIE) {
8941                         int pad;
8942
8943                         /* found the cookie */
8944                         if ((pad = (plen % 4))) {
8945                                 plen += 4 - pad;
8946                         }
8947                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8948                         if (cookie == NULL) {
8949                                 /* No memory */
8950                                 return (-2);
8951                         }
8952 #ifdef SCTP_MBUF_LOGGING
8953                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8954                                 struct mbuf *mat;
8955
8956                                 mat = cookie;
8957                                 while (mat) {
8958                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8959                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8960                                         }
8961                                         mat = SCTP_BUF_NEXT(mat);
8962                                 }
8963                         }
8964 #endif
8965                         break;
8966                 }
8967                 at += SCTP_SIZE32(plen);
8968         } while (phdr);
8969         if (cookie == NULL) {
8970                 /* Did not find the cookie */
8971                 return (-3);
8972         }
8973         /* ok, we got the cookie lets change it into a cookie echo chunk */
8974
8975         /* first the change from param to cookie */
8976         hdr = mtod(cookie, struct sctp_chunkhdr *);
8977         hdr->chunk_type = SCTP_COOKIE_ECHO;
8978         hdr->chunk_flags = 0;
8979         /* get the chunk stuff now and place it in the FRONT of the queue */
8980         sctp_alloc_a_chunk(stcb, chk);
8981         if (chk == NULL) {
8982                 /* no memory */
8983                 sctp_m_freem(cookie);
8984                 return (-5);
8985         }
8986         chk->copy_by_ref = 0;
8987         chk->send_size = plen;
8988         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8989         chk->rec.chunk_id.can_take_data = 0;
8990         chk->sent = SCTP_DATAGRAM_UNSENT;
8991         chk->snd_count = 0;
8992         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8993         chk->asoc = &stcb->asoc;
8994         chk->data = cookie;
8995         chk->whoTo = net;
8996         atomic_add_int(&chk->whoTo->ref_count, 1);
8997         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8998         chk->asoc->ctrl_queue_cnt++;
8999         return (0);
9000 }
9001
9002 void
9003 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9004     struct mbuf *m,
9005     int offset,
9006     int chk_length,
9007     struct sctp_nets *net)
9008 {
9009         /*
9010          * take a HB request and make it into a HB ack and send it.
9011          */
9012         struct mbuf *outchain;
9013         struct sctp_chunkhdr *chdr;
9014         struct sctp_tmit_chunk *chk;
9015
9016
9017         if (net == NULL)
9018                 /* must have a net pointer */
9019                 return;
9020
9021         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9022         if (outchain == NULL) {
9023                 /* gak out of memory */
9024                 return;
9025         }
9026 #ifdef SCTP_MBUF_LOGGING
9027         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9028                 struct mbuf *mat;
9029
9030                 mat = outchain;
9031                 while (mat) {
9032                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9033                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9034                         }
9035                         mat = SCTP_BUF_NEXT(mat);
9036                 }
9037         }
9038 #endif
9039         chdr = mtod(outchain, struct sctp_chunkhdr *);
9040         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9041         chdr->chunk_flags = 0;
9042         if (chk_length % 4) {
9043                 /* need pad */
9044                 uint32_t cpthis = 0;
9045                 int padlen;
9046
9047                 padlen = 4 - (chk_length % 4);
9048                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9049         }
9050         sctp_alloc_a_chunk(stcb, chk);
9051         if (chk == NULL) {
9052                 /* no memory */
9053                 sctp_m_freem(outchain);
9054                 return;
9055         }
9056         chk->copy_by_ref = 0;
9057         chk->send_size = chk_length;
9058         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9059         chk->rec.chunk_id.can_take_data = 1;
9060         chk->sent = SCTP_DATAGRAM_UNSENT;
9061         chk->snd_count = 0;
9062         chk->flags = 0;
9063         chk->asoc = &stcb->asoc;
9064         chk->data = outchain;
9065         chk->whoTo = net;
9066         atomic_add_int(&chk->whoTo->ref_count, 1);
9067         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9068         chk->asoc->ctrl_queue_cnt++;
9069 }
9070
9071 void
9072 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9073 {
9074         /* formulate and queue a cookie-ack back to sender */
9075         struct mbuf *cookie_ack;
9076         struct sctp_chunkhdr *hdr;
9077         struct sctp_tmit_chunk *chk;
9078
9079         cookie_ack = NULL;
9080         SCTP_TCB_LOCK_ASSERT(stcb);
9081
9082         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9083         if (cookie_ack == NULL) {
9084                 /* no mbuf's */
9085                 return;
9086         }
9087         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9088         sctp_alloc_a_chunk(stcb, chk);
9089         if (chk == NULL) {
9090                 /* no memory */
9091                 sctp_m_freem(cookie_ack);
9092                 return;
9093         }
9094         chk->copy_by_ref = 0;
9095         chk->send_size = sizeof(struct sctp_chunkhdr);
9096         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9097         chk->rec.chunk_id.can_take_data = 1;
9098         chk->sent = SCTP_DATAGRAM_UNSENT;
9099         chk->snd_count = 0;
9100         chk->flags = 0;
9101         chk->asoc = &stcb->asoc;
9102         chk->data = cookie_ack;
9103         if (chk->asoc->last_control_chunk_from != NULL) {
9104                 chk->whoTo = chk->asoc->last_control_chunk_from;
9105                 atomic_add_int(&chk->whoTo->ref_count, 1);
9106         } else {
9107                 chk->whoTo = NULL;
9108         }
9109         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9110         hdr->chunk_type = SCTP_COOKIE_ACK;
9111         hdr->chunk_flags = 0;
9112         hdr->chunk_length = htons(chk->send_size);
9113         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9114         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9115         chk->asoc->ctrl_queue_cnt++;
9116         return;
9117 }
9118
9119
9120 void
9121 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9122 {
9123         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9124         struct mbuf *m_shutdown_ack;
9125         struct sctp_shutdown_ack_chunk *ack_cp;
9126         struct sctp_tmit_chunk *chk;
9127
9128         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9129         if (m_shutdown_ack == NULL) {
9130                 /* no mbuf's */
9131                 return;
9132         }
9133         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9134         sctp_alloc_a_chunk(stcb, chk);
9135         if (chk == NULL) {
9136                 /* no memory */
9137                 sctp_m_freem(m_shutdown_ack);
9138                 return;
9139         }
9140         chk->copy_by_ref = 0;
9141         chk->send_size = sizeof(struct sctp_chunkhdr);
9142         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9143         chk->rec.chunk_id.can_take_data = 1;
9144         chk->sent = SCTP_DATAGRAM_UNSENT;
9145         chk->snd_count = 0;
9146         chk->flags = 0;
9147         chk->asoc = &stcb->asoc;
9148         chk->data = m_shutdown_ack;
9149         chk->whoTo = net;
9150         if (chk->whoTo) {
9151                 atomic_add_int(&chk->whoTo->ref_count, 1);
9152         }
9153         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9154         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9155         ack_cp->ch.chunk_flags = 0;
9156         ack_cp->ch.chunk_length = htons(chk->send_size);
9157         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9158         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9159         chk->asoc->ctrl_queue_cnt++;
9160         return;
9161 }
9162
9163 void
9164 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9165 {
9166         /* formulate and queue a SHUTDOWN to the sender */
9167         struct mbuf *m_shutdown;
9168         struct sctp_shutdown_chunk *shutdown_cp;
9169         struct sctp_tmit_chunk *chk;
9170
9171         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9172         if (m_shutdown == NULL) {
9173                 /* no mbuf's */
9174                 return;
9175         }
9176         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9177         sctp_alloc_a_chunk(stcb, chk);
9178         if (chk == NULL) {
9179                 /* no memory */
9180                 sctp_m_freem(m_shutdown);
9181                 return;
9182         }
9183         chk->copy_by_ref = 0;
9184         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9185         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9186         chk->rec.chunk_id.can_take_data = 1;
9187         chk->sent = SCTP_DATAGRAM_UNSENT;
9188         chk->snd_count = 0;
9189         chk->flags = 0;
9190         chk->asoc = &stcb->asoc;
9191         chk->data = m_shutdown;
9192         chk->whoTo = net;
9193         if (chk->whoTo) {
9194                 atomic_add_int(&chk->whoTo->ref_count, 1);
9195         }
9196         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9197         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9198         shutdown_cp->ch.chunk_flags = 0;
9199         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9200         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9201         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9202         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9203         chk->asoc->ctrl_queue_cnt++;
9204         return;
9205 }
9206
9207 void
9208 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9209 {
9210         /*
9211          * formulate and queue an ASCONF to the peer. ASCONF parameters
9212          * should be queued on the assoc queue.
9213          */
9214         struct sctp_tmit_chunk *chk;
9215         struct mbuf *m_asconf;
9216         int len;
9217
9218         SCTP_TCB_LOCK_ASSERT(stcb);
9219
9220         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9221             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9222                 /* can't send a new one if there is one in flight already */
9223                 return;
9224         }
9225         /* compose an ASCONF chunk, maximum length is PMTU */
9226         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9227         if (m_asconf == NULL) {
9228                 return;
9229         }
9230         sctp_alloc_a_chunk(stcb, chk);
9231         if (chk == NULL) {
9232                 /* no memory */
9233                 sctp_m_freem(m_asconf);
9234                 return;
9235         }
9236         chk->copy_by_ref = 0;
9237         chk->data = m_asconf;
9238         chk->send_size = len;
9239         chk->rec.chunk_id.id = SCTP_ASCONF;
9240         chk->rec.chunk_id.can_take_data = 0;
9241         chk->sent = SCTP_DATAGRAM_UNSENT;
9242         chk->snd_count = 0;
9243         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9244         chk->asoc = &stcb->asoc;
9245         chk->whoTo = net;
9246         if (chk->whoTo) {
9247                 atomic_add_int(&chk->whoTo->ref_count, 1);
9248         }
9249         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9250         chk->asoc->ctrl_queue_cnt++;
9251         return;
9252 }
9253
9254 void
9255 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9256 {
9257         /*
9258          * formulate and queue a asconf-ack back to sender. the asconf-ack
9259          * must be stored in the tcb.
9260          */
9261         struct sctp_tmit_chunk *chk;
9262         struct sctp_asconf_ack *ack, *latest_ack;
9263         struct mbuf *m_ack;
9264         struct sctp_nets *net = NULL;
9265
9266         SCTP_TCB_LOCK_ASSERT(stcb);
9267         /* Get the latest ASCONF-ACK */
9268         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9269         if (latest_ack == NULL) {
9270                 return;
9271         }
9272         if (latest_ack->last_sent_to != NULL &&
9273             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9274                 /* we're doing a retransmission */
9275                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9276                 if (net == NULL) {
9277                         /* no alternate */
9278                         if (stcb->asoc.last_control_chunk_from == NULL) {
9279                                 if (stcb->asoc.alternate) {
9280                                         net = stcb->asoc.alternate;
9281                                 } else {
9282                                         net = stcb->asoc.primary_destination;
9283                                 }
9284                         } else {
9285                                 net = stcb->asoc.last_control_chunk_from;
9286                         }
9287                 }
9288         } else {
9289                 /* normal case */
9290                 if (stcb->asoc.last_control_chunk_from == NULL) {
9291                         if (stcb->asoc.alternate) {
9292                                 net = stcb->asoc.alternate;
9293                         } else {
9294                                 net = stcb->asoc.primary_destination;
9295                         }
9296                 } else {
9297                         net = stcb->asoc.last_control_chunk_from;
9298                 }
9299         }
9300         latest_ack->last_sent_to = net;
9301
9302         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9303                 if (ack->data == NULL) {
9304                         continue;
9305                 }
9306                 /* copy the asconf_ack */
9307                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9308                 if (m_ack == NULL) {
9309                         /* couldn't copy it */
9310                         return;
9311                 }
9312 #ifdef SCTP_MBUF_LOGGING
9313                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9314                         struct mbuf *mat;
9315
9316                         mat = m_ack;
9317                         while (mat) {
9318                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9319                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9320                                 }
9321                                 mat = SCTP_BUF_NEXT(mat);
9322                         }
9323                 }
9324 #endif
9325
9326                 sctp_alloc_a_chunk(stcb, chk);
9327                 if (chk == NULL) {
9328                         /* no memory */
9329                         if (m_ack)
9330                                 sctp_m_freem(m_ack);
9331                         return;
9332                 }
9333                 chk->copy_by_ref = 0;
9334
9335                 chk->whoTo = net;
9336                 if (chk->whoTo) {
9337                         atomic_add_int(&chk->whoTo->ref_count, 1);
9338                 }
9339                 chk->data = m_ack;
9340                 chk->send_size = 0;
9341                 /* Get size */
9342                 chk->send_size = ack->len;
9343                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9344                 chk->rec.chunk_id.can_take_data = 1;
9345                 chk->sent = SCTP_DATAGRAM_UNSENT;
9346                 chk->snd_count = 0;
9347                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9348                 chk->asoc = &stcb->asoc;
9349
9350                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9351                 chk->asoc->ctrl_queue_cnt++;
9352         }
9353         return;
9354 }
9355
9356
9357 static int
9358 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9359     struct sctp_tcb *stcb,
9360     struct sctp_association *asoc,
9361     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9362 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9363     SCTP_UNUSED
9364 #endif
9365 )
9366 {
9367         /*-
9368          * send out one MTU of retransmission. If fast_retransmit is
9369          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9370          * rwnd. For a Cookie or Asconf in the control chunk queue we
9371          * retransmit them by themselves.
9372          *
9373          * For data chunks we will pick out the lowest TSN's in the sent_queue
9374          * marked for resend and bundle them all together (up to a MTU of
9375          * destination). The address to send to should have been
9376          * selected/changed where the retransmission was marked (i.e. in FR
9377          * or t3-timeout routines).
9378          */
9379         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9380         struct sctp_tmit_chunk *chk, *fwd;
9381         struct mbuf *m, *endofchain;
9382         struct sctp_nets *net = NULL;
9383         uint32_t tsns_sent = 0;
9384         int no_fragmentflg, bundle_at, cnt_thru;
9385         unsigned int mtu;
9386         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9387         struct sctp_auth_chunk *auth = NULL;
9388         uint32_t auth_offset = 0;
9389         uint16_t auth_keyid;
9390         int override_ok = 1;
9391         int data_auth_reqd = 0;
9392         uint32_t dmtu = 0;
9393
9394         SCTP_TCB_LOCK_ASSERT(stcb);
9395         tmr_started = ctl_cnt = bundle_at = error = 0;
9396         no_fragmentflg = 1;
9397         fwd_tsn = 0;
9398         *cnt_out = 0;
9399         fwd = NULL;
9400         endofchain = m = NULL;
9401         auth_keyid = stcb->asoc.authinfo.active_keyid;
9402 #ifdef SCTP_AUDITING_ENABLED
9403         sctp_audit_log(0xC3, 1);
9404 #endif
9405         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9406             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9407                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9408                     asoc->sent_queue_retran_cnt);
9409                 asoc->sent_queue_cnt = 0;
9410                 asoc->sent_queue_cnt_removeable = 0;
9411                 /* send back 0/0 so we enter normal transmission */
9412                 *cnt_out = 0;
9413                 return (0);
9414         }
9415         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9416                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9417                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9418                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9419                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9420                                 continue;
9421                         }
9422                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9423                                 if (chk != asoc->str_reset) {
9424                                         /*
9425                                          * not eligible for retran if its
9426                                          * not ours
9427                                          */
9428                                         continue;
9429                                 }
9430                         }
9431                         ctl_cnt++;
9432                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9433                                 fwd_tsn = 1;
9434                         }
9435                         /*
9436                          * Add an AUTH chunk, if chunk requires it save the
9437                          * offset into the chain for AUTH
9438                          */
9439                         if ((auth == NULL) &&
9440                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9441                             stcb->asoc.peer_auth_chunks))) {
9442                                 m = sctp_add_auth_chunk(m, &endofchain,
9443                                     &auth, &auth_offset,
9444                                     stcb,
9445                                     chk->rec.chunk_id.id);
9446                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9447                         }
9448                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9449                         break;
9450                 }
9451         }
9452         one_chunk = 0;
9453         cnt_thru = 0;
9454         /* do we have control chunks to retransmit? */
9455         if (m != NULL) {
9456                 /* Start a timer no matter if we suceed or fail */
9457                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9458                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9459                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9460                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9461                 chk->snd_count++;       /* update our count */
9462                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9463                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9464                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9465                     no_fragmentflg, 0, 0,
9466                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9467                     chk->whoTo->port, so_locked, NULL, NULL))) {
9468                         SCTP_STAT_INCR(sctps_lowlevelerr);
9469                         return (error);
9470                 }
9471                 endofchain = NULL;
9472                 auth = NULL;
9473                 auth_offset = 0;
9474                 /*
9475                  * We don't want to mark the net->sent time here since this
9476                  * we use this for HB and retrans cannot measure RTT
9477                  */
9478                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9479                 *cnt_out += 1;
9480                 chk->sent = SCTP_DATAGRAM_SENT;
9481                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9482                 if (fwd_tsn == 0) {
9483                         return (0);
9484                 } else {
9485                         /* Clean up the fwd-tsn list */
9486                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9487                         return (0);
9488                 }
9489         }
9490         /*
9491          * Ok, it is just data retransmission we need to do or that and a
9492          * fwd-tsn with it all.
9493          */
9494         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9495                 return (SCTP_RETRAN_DONE);
9496         }
9497         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9498             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9499                 /* not yet open, resend the cookie and that is it */
9500                 return (1);
9501         }
9502 #ifdef SCTP_AUDITING_ENABLED
9503         sctp_auditing(20, inp, stcb, NULL);
9504 #endif
9505         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9506         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9507                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9508                         /* No, not sent to this net or not ready for rtx */
9509                         continue;
9510                 }
9511                 if (chk->data == NULL) {
9512                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9513                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9514                         continue;
9515                 }
9516                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9517                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9518                         /* Gak, we have exceeded max unlucky retran, abort! */
9519                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9520                             chk->snd_count,
9521                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9522                         atomic_add_int(&stcb->asoc.refcnt, 1);
9523                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9524                         SCTP_TCB_LOCK(stcb);
9525                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9526                         return (SCTP_RETRAN_EXIT);
9527                 }
9528                 /* pick up the net */
9529                 net = chk->whoTo;
9530                 switch (net->ro._l_addr.sa.sa_family) {
9531 #ifdef INET
9532                 case AF_INET:
9533                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9534                         break;
9535 #endif
9536 #ifdef INET6
9537                 case AF_INET6:
9538                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9539                         break;
9540 #endif
9541                 default:
9542                         /* TSNH */
9543                         mtu = net->mtu;
9544                         break;
9545                 }
9546
9547                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9548                         /* No room in peers rwnd */
9549                         uint32_t tsn;
9550
9551                         tsn = asoc->last_acked_seq + 1;
9552                         if (tsn == chk->rec.data.TSN_seq) {
9553                                 /*
9554                                  * we make a special exception for this
9555                                  * case. The peer has no rwnd but is missing
9556                                  * the lowest chunk.. which is probably what
9557                                  * is holding up the rwnd.
9558                                  */
9559                                 goto one_chunk_around;
9560                         }
9561                         return (1);
9562                 }
9563 one_chunk_around:
9564                 if (asoc->peers_rwnd < mtu) {
9565                         one_chunk = 1;
9566                         if ((asoc->peers_rwnd == 0) &&
9567                             (asoc->total_flight == 0)) {
9568                                 chk->window_probe = 1;
9569                                 chk->whoTo->window_probe = 1;
9570                         }
9571                 }
9572 #ifdef SCTP_AUDITING_ENABLED
9573                 sctp_audit_log(0xC3, 2);
9574 #endif
9575                 bundle_at = 0;
9576                 m = NULL;
9577                 net->fast_retran_ip = 0;
9578                 if (chk->rec.data.doing_fast_retransmit == 0) {
9579                         /*
9580                          * if no FR in progress skip destination that have
9581                          * flight_size > cwnd.
9582                          */
9583                         if (net->flight_size >= net->cwnd) {
9584                                 continue;
9585                         }
9586                 } else {
9587                         /*
9588                          * Mark the destination net to have FR recovery
9589                          * limits put on it.
9590                          */
9591                         *fr_done = 1;
9592                         net->fast_retran_ip = 1;
9593                 }
9594
9595                 /*
9596                  * if no AUTH is yet included and this chunk requires it,
9597                  * make sure to account for it.  We don't apply the size
9598                  * until the AUTH chunk is actually added below in case
9599                  * there is no room for this chunk.
9600                  */
9601                 if (data_auth_reqd && (auth == NULL)) {
9602                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9603                 } else
9604                         dmtu = 0;
9605
9606                 if ((chk->send_size <= (mtu - dmtu)) ||
9607                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9608                         /* ok we will add this one */
9609                         if (data_auth_reqd) {
9610                                 if (auth == NULL) {
9611                                         m = sctp_add_auth_chunk(m,
9612                                             &endofchain,
9613                                             &auth,
9614                                             &auth_offset,
9615                                             stcb,
9616                                             SCTP_DATA);
9617                                         auth_keyid = chk->auth_keyid;
9618                                         override_ok = 0;
9619                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9620                                 } else if (override_ok) {
9621                                         auth_keyid = chk->auth_keyid;
9622                                         override_ok = 0;
9623                                 } else if (chk->auth_keyid != auth_keyid) {
9624                                         /* different keyid, so done bundling */
9625                                         break;
9626                                 }
9627                         }
9628                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9629                         if (m == NULL) {
9630                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9631                                 return (ENOMEM);
9632                         }
9633                         /* Do clear IP_DF ? */
9634                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9635                                 no_fragmentflg = 0;
9636                         }
9637                         /* upate our MTU size */
9638                         if (mtu > (chk->send_size + dmtu))
9639                                 mtu -= (chk->send_size + dmtu);
9640                         else
9641                                 mtu = 0;
9642                         data_list[bundle_at++] = chk;
9643                         if (one_chunk && (asoc->total_flight <= 0)) {
9644                                 SCTP_STAT_INCR(sctps_windowprobed);
9645                         }
9646                 }
9647                 if (one_chunk == 0) {
9648                         /*
9649                          * now are there anymore forward from chk to pick
9650                          * up?
9651                          */
9652                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9653                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9654                                         /* Nope, not for retran */
9655                                         continue;
9656                                 }
9657                                 if (fwd->whoTo != net) {
9658                                         /* Nope, not the net in question */
9659                                         continue;
9660                                 }
9661                                 if (data_auth_reqd && (auth == NULL)) {
9662                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9663                                 } else
9664                                         dmtu = 0;
9665                                 if (fwd->send_size <= (mtu - dmtu)) {
9666                                         if (data_auth_reqd) {
9667                                                 if (auth == NULL) {
9668                                                         m = sctp_add_auth_chunk(m,
9669                                                             &endofchain,
9670                                                             &auth,
9671                                                             &auth_offset,
9672                                                             stcb,
9673                                                             SCTP_DATA);
9674                                                         auth_keyid = fwd->auth_keyid;
9675                                                         override_ok = 0;
9676                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9677                                                 } else if (override_ok) {
9678                                                         auth_keyid = fwd->auth_keyid;
9679                                                         override_ok = 0;
9680                                                 } else if (fwd->auth_keyid != auth_keyid) {
9681                                                         /*
9682                                                          * different keyid,
9683                                                          * so done bundling
9684                                                          */
9685                                                         break;
9686                                                 }
9687                                         }
9688                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9689                                         if (m == NULL) {
9690                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9691                                                 return (ENOMEM);
9692                                         }
9693                                         /* Do clear IP_DF ? */
9694                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9695                                                 no_fragmentflg = 0;
9696                                         }
9697                                         /* upate our MTU size */
9698                                         if (mtu > (fwd->send_size + dmtu))
9699                                                 mtu -= (fwd->send_size + dmtu);
9700                                         else
9701                                                 mtu = 0;
9702                                         data_list[bundle_at++] = fwd;
9703                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9704                                                 break;
9705                                         }
9706                                 } else {
9707                                         /* can't fit so we are done */
9708                                         break;
9709                                 }
9710                         }
9711                 }
9712                 /* Is there something to send for this destination? */
9713                 if (m) {
9714                         /*
9715                          * No matter if we fail/or suceed we should start a
9716                          * timer. A failure is like a lost IP packet :-)
9717                          */
9718                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9719                                 /*
9720                                  * no timer running on this destination
9721                                  * restart it.
9722                                  */
9723                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9724                                 tmr_started = 1;
9725                         }
9726                         /* Now lets send it, if there is anything to send :> */
9727                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9728                             (struct sockaddr *)&net->ro._l_addr, m,
9729                             auth_offset, auth, auth_keyid,
9730                             no_fragmentflg, 0, 0,
9731                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9732                             net->port, so_locked, NULL, NULL))) {
9733                                 /* error, we could not output */
9734                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9735                                 return (error);
9736                         }
9737                         endofchain = NULL;
9738                         auth = NULL;
9739                         auth_offset = 0;
9740                         /* For HB's */
9741                         /*
9742                          * We don't want to mark the net->sent time here
9743                          * since this we use this for HB and retrans cannot
9744                          * measure RTT
9745                          */
9746                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9747
9748                         /* For auto-close */
9749                         cnt_thru++;
9750                         if (*now_filled == 0) {
9751                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9752                                 *now = asoc->time_last_sent;
9753                                 *now_filled = 1;
9754                         } else {
9755                                 asoc->time_last_sent = *now;
9756                         }
9757                         *cnt_out += bundle_at;
9758 #ifdef SCTP_AUDITING_ENABLED
9759                         sctp_audit_log(0xC4, bundle_at);
9760 #endif
9761                         if (bundle_at) {
9762                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9763                         }
9764                         for (i = 0; i < bundle_at; i++) {
9765                                 SCTP_STAT_INCR(sctps_sendretransdata);
9766                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9767                                 /*
9768                                  * When we have a revoked data, and we
9769                                  * retransmit it, then we clear the revoked
9770                                  * flag since this flag dictates if we
9771                                  * subtracted from the fs
9772                                  */
9773                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9774                                         /* Deflate the cwnd */
9775                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9776                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9777                                 }
9778                                 data_list[i]->snd_count++;
9779                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9780                                 /* record the time */
9781                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9782                                 if (data_list[i]->book_size_scale) {
9783                                         /*
9784                                          * need to double the book size on
9785                                          * this one
9786                                          */
9787                                         data_list[i]->book_size_scale = 0;
9788                                         /*
9789                                          * Since we double the booksize, we
9790                                          * must also double the output queue
9791                                          * size, since this get shrunk when
9792                                          * we free by this amount.
9793                                          */
9794                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9795                                         data_list[i]->book_size *= 2;
9796
9797
9798                                 } else {
9799                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9800                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9801                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9802                                         }
9803                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9804                                             (uint32_t) (data_list[i]->send_size +
9805                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9806                                 }
9807                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9808                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9809                                             data_list[i]->whoTo->flight_size,
9810                                             data_list[i]->book_size,
9811                                             (uintptr_t) data_list[i]->whoTo,
9812                                             data_list[i]->rec.data.TSN_seq);
9813                                 }
9814                                 sctp_flight_size_increase(data_list[i]);
9815                                 sctp_total_flight_increase(stcb, data_list[i]);
9816                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9817                                         /* SWS sender side engages */
9818                                         asoc->peers_rwnd = 0;
9819                                 }
9820                                 if ((i == 0) &&
9821                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9822                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9823                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9824                                             (tmr_started == 0)) {
9825                                                 /*-
9826                                                  * ok we just fast-retrans'd
9827                                                  * the lowest TSN, i.e the
9828                                                  * first on the list. In
9829                                                  * this case we want to give
9830                                                  * some more time to get a
9831                                                  * SACK back without a
9832                                                  * t3-expiring.
9833                                                  */
9834                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9835                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9836                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9837                                         }
9838                                 }
9839                         }
9840                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9841                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9842                         }
9843 #ifdef SCTP_AUDITING_ENABLED
9844                         sctp_auditing(21, inp, stcb, NULL);
9845 #endif
9846                 } else {
9847                         /* None will fit */
9848                         return (1);
9849                 }
9850                 if (asoc->sent_queue_retran_cnt <= 0) {
9851                         /* all done we have no more to retran */
9852                         asoc->sent_queue_retran_cnt = 0;
9853                         break;
9854                 }
9855                 if (one_chunk) {
9856                         /* No more room in rwnd */
9857                         return (1);
9858                 }
9859                 /* stop the for loop here. we sent out a packet */
9860                 break;
9861         }
9862         return (0);
9863 }
9864
9865 static void
9866 sctp_timer_validation(struct sctp_inpcb *inp,
9867     struct sctp_tcb *stcb,
9868     struct sctp_association *asoc)
9869 {
9870         struct sctp_nets *net;
9871
9872         /* Validate that a timer is running somewhere */
9873         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9874                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9875                         /* Here is a timer */
9876                         return;
9877                 }
9878         }
9879         SCTP_TCB_LOCK_ASSERT(stcb);
9880         /* Gak, we did not have a timer somewhere */
9881         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9882         if (asoc->alternate) {
9883                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9884         } else {
9885                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9886         }
9887         return;
9888 }
9889
9890 void
9891 sctp_chunk_output(struct sctp_inpcb *inp,
9892     struct sctp_tcb *stcb,
9893     int from_where,
9894     int so_locked
9895 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9896     SCTP_UNUSED
9897 #endif
9898 )
9899 {
9900         /*-
9901          * Ok this is the generic chunk service queue. we must do the
9902          * following:
9903          * - See if there are retransmits pending, if so we must
9904          *   do these first.
9905          * - Service the stream queue that is next, moving any
9906          *   message (note I must get a complete message i.e.
9907          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9908          *   TSN's
9909          * - Check to see if the cwnd/rwnd allows any output, if so we
9910          *   go ahead and fomulate and send the low level chunks. Making sure
9911          *   to combine any control in the control chunk queue also.
9912          */
9913         struct sctp_association *asoc;
9914         struct sctp_nets *net;
9915         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9916         unsigned int burst_cnt = 0;
9917         struct timeval now;
9918         int now_filled = 0;
9919         int nagle_on;
9920         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9921         int un_sent = 0;
9922         int fr_done;
9923         unsigned int tot_frs = 0;
9924
9925         asoc = &stcb->asoc;
9926         /* The Nagle algorithm is only applied when handling a send call. */
9927         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9928                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9929                         nagle_on = 0;
9930                 } else {
9931                         nagle_on = 1;
9932                 }
9933         } else {
9934                 nagle_on = 0;
9935         }
9936         SCTP_TCB_LOCK_ASSERT(stcb);
9937
9938         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9939
9940         if ((un_sent <= 0) &&
9941             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9942             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9943             (asoc->sent_queue_retran_cnt == 0)) {
9944                 /* Nothing to do unless there is something to be sent left */
9945                 return;
9946         }
9947         /*
9948          * Do we have something to send, data or control AND a sack timer
9949          * running, if so piggy-back the sack.
9950          */
9951         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9952                 sctp_send_sack(stcb, so_locked);
9953                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9954         }
9955         while (asoc->sent_queue_retran_cnt) {
9956                 /*-
9957                  * Ok, it is retransmission time only, we send out only ONE
9958                  * packet with a single call off to the retran code.
9959                  */
9960                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9961                         /*-
9962                          * Special hook for handling cookiess discarded
9963                          * by peer that carried data. Send cookie-ack only
9964                          * and then the next call with get the retran's.
9965                          */
9966                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9967                             from_where,
9968                             &now, &now_filled, frag_point, so_locked);
9969                         return;
9970                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9971                         /* if its not from a HB then do it */
9972                         fr_done = 0;
9973                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9974                         if (fr_done) {
9975                                 tot_frs++;
9976                         }
9977                 } else {
9978                         /*
9979                          * its from any other place, we don't allow retran
9980                          * output (only control)
9981                          */
9982                         ret = 1;
9983                 }
9984                 if (ret > 0) {
9985                         /* Can't send anymore */
9986                         /*-
9987                          * now lets push out control by calling med-level
9988                          * output once. this assures that we WILL send HB's
9989                          * if queued too.
9990                          */
9991                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9992                             from_where,
9993                             &now, &now_filled, frag_point, so_locked);
9994 #ifdef SCTP_AUDITING_ENABLED
9995                         sctp_auditing(8, inp, stcb, NULL);
9996 #endif
9997                         sctp_timer_validation(inp, stcb, asoc);
9998                         return;
9999                 }
10000                 if (ret < 0) {
10001                         /*-
10002                          * The count was off.. retran is not happening so do
10003                          * the normal retransmission.
10004                          */
10005 #ifdef SCTP_AUDITING_ENABLED
10006                         sctp_auditing(9, inp, stcb, NULL);
10007 #endif
10008                         if (ret == SCTP_RETRAN_EXIT) {
10009                                 return;
10010                         }
10011                         break;
10012                 }
10013                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10014                         /* Only one transmission allowed out of a timeout */
10015 #ifdef SCTP_AUDITING_ENABLED
10016                         sctp_auditing(10, inp, stcb, NULL);
10017 #endif
10018                         /* Push out any control */
10019                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10020                             &now, &now_filled, frag_point, so_locked);
10021                         return;
10022                 }
10023                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10024                         /* Hit FR burst limit */
10025                         return;
10026                 }
10027                 if ((num_out == 0) && (ret == 0)) {
10028                         /* No more retrans to send */
10029                         break;
10030                 }
10031         }
10032 #ifdef SCTP_AUDITING_ENABLED
10033         sctp_auditing(12, inp, stcb, NULL);
10034 #endif
10035         /* Check for bad destinations, if they exist move chunks around. */
10036         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10037                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10038                         /*-
10039                          * if possible move things off of this address we
10040                          * still may send below due to the dormant state but
10041                          * we try to find an alternate address to send to
10042                          * and if we have one we move all queued data on the
10043                          * out wheel to this alternate address.
10044                          */
10045                         if (net->ref_count > 1)
10046                                 sctp_move_chunks_from_net(stcb, net);
10047                 } else {
10048                         /*-
10049                          * if ((asoc->sat_network) || (net->addr_is_local))
10050                          * { burst_limit = asoc->max_burst *
10051                          * SCTP_SAT_NETWORK_BURST_INCR; }
10052                          */
10053                         if (asoc->max_burst > 0) {
10054                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10055                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10056                                                 /*
10057                                                  * JRS - Use the congestion
10058                                                  * control given in the
10059                                                  * congestion control module
10060                                                  */
10061                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10062                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10063                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10064                                                 }
10065                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10066                                         }
10067                                         net->fast_retran_ip = 0;
10068                                 } else {
10069                                         if (net->flight_size == 0) {
10070                                                 /*
10071                                                  * Should be decaying the
10072                                                  * cwnd here
10073                                                  */
10074                                                 ;
10075                                         }
10076                                 }
10077                         }
10078                 }
10079
10080         }
10081         burst_cnt = 0;
10082         do {
10083                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10084                     &reason_code, 0, from_where,
10085                     &now, &now_filled, frag_point, so_locked);
10086                 if (error) {
10087                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10088                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10089                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10090                         }
10091                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10092                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10093                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10094                         }
10095                         break;
10096                 }
10097                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10098
10099                 tot_out += num_out;
10100                 burst_cnt++;
10101                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10102                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10103                         if (num_out == 0) {
10104                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10105                         }
10106                 }
10107                 if (nagle_on) {
10108                         /*
10109                          * When the Nagle algorithm is used, look at how
10110                          * much is unsent, then if its smaller than an MTU
10111                          * and we have data in flight we stop, except if we
10112                          * are handling a fragmented user message.
10113                          */
10114                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10115                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10116                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10117                             (stcb->asoc.total_flight > 0) &&
10118                             ((stcb->asoc.locked_on_sending == NULL) ||
10119                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10120                                 break;
10121                         }
10122                 }
10123                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10124                     TAILQ_EMPTY(&asoc->send_queue) &&
10125                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10126                         /* Nothing left to send */
10127                         break;
10128                 }
10129                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10130                         /* Nothing left to send */
10131                         break;
10132                 }
10133         } while (num_out &&
10134             ((asoc->max_burst == 0) ||
10135             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10136             (burst_cnt < asoc->max_burst)));
10137
10138         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10139                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10140                         SCTP_STAT_INCR(sctps_maxburstqueued);
10141                         asoc->burst_limit_applied = 1;
10142                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10143                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10144                         }
10145                 } else {
10146                         asoc->burst_limit_applied = 0;
10147                 }
10148         }
10149         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10150                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10151         }
10152         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10153             tot_out);
10154
10155         /*-
10156          * Now we need to clean up the control chunk chain if a ECNE is on
10157          * it. It must be marked as UNSENT again so next call will continue
10158          * to send it until such time that we get a CWR, to remove it.
10159          */
10160         if (stcb->asoc.ecn_echo_cnt_onq)
10161                 sctp_fix_ecn_echo(asoc);
10162         return;
10163 }
10164
10165
10166 int
10167 sctp_output(
10168     struct sctp_inpcb *inp,
10169     struct mbuf *m,
10170     struct sockaddr *addr,
10171     struct mbuf *control,
10172     struct thread *p,
10173     int flags)
10174 {
10175         if (inp == NULL) {
10176                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10177                 return (EINVAL);
10178         }
10179         if (inp->sctp_socket == NULL) {
10180                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10181                 return (EINVAL);
10182         }
10183         return (sctp_sosend(inp->sctp_socket,
10184             addr,
10185             (struct uio *)NULL,
10186             m,
10187             control,
10188             flags, p
10189             ));
10190 }
10191
10192 void
10193 send_forward_tsn(struct sctp_tcb *stcb,
10194     struct sctp_association *asoc)
10195 {
10196         struct sctp_tmit_chunk *chk;
10197         struct sctp_forward_tsn_chunk *fwdtsn;
10198         uint32_t advance_peer_ack_point;
10199
10200         SCTP_TCB_LOCK_ASSERT(stcb);
10201         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10202                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10203                         /* mark it to unsent */
10204                         chk->sent = SCTP_DATAGRAM_UNSENT;
10205                         chk->snd_count = 0;
10206                         /* Do we correct its output location? */
10207                         if (chk->whoTo) {
10208                                 sctp_free_remote_addr(chk->whoTo);
10209                                 chk->whoTo = NULL;
10210                         }
10211                         goto sctp_fill_in_rest;
10212                 }
10213         }
10214         /* Ok if we reach here we must build one */
10215         sctp_alloc_a_chunk(stcb, chk);
10216         if (chk == NULL) {
10217                 return;
10218         }
10219         asoc->fwd_tsn_cnt++;
10220         chk->copy_by_ref = 0;
10221         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10222         chk->rec.chunk_id.can_take_data = 0;
10223         chk->asoc = asoc;
10224         chk->whoTo = NULL;
10225         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10226         if (chk->data == NULL) {
10227                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10228                 return;
10229         }
10230         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10231         chk->sent = SCTP_DATAGRAM_UNSENT;
10232         chk->snd_count = 0;
10233         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10234         asoc->ctrl_queue_cnt++;
10235 sctp_fill_in_rest:
10236         /*-
10237          * Here we go through and fill out the part that deals with
10238          * stream/seq of the ones we skip.
10239          */
10240         SCTP_BUF_LEN(chk->data) = 0;
10241         {
10242                 struct sctp_tmit_chunk *at, *tp1, *last;
10243                 struct sctp_strseq *strseq;
10244                 unsigned int cnt_of_space, i, ovh;
10245                 unsigned int space_needed;
10246                 unsigned int cnt_of_skipped = 0;
10247
10248                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10249                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10250                                 /* no more to look at */
10251                                 break;
10252                         }
10253                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10254                                 /* We don't report these */
10255                                 continue;
10256                         }
10257                         cnt_of_skipped++;
10258                 }
10259                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10260                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10261
10262                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10263
10264                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10265                         ovh = SCTP_MIN_OVERHEAD;
10266                 } else {
10267                         ovh = SCTP_MIN_V4_OVERHEAD;
10268                 }
10269                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10270                         /* trim to a mtu size */
10271                         cnt_of_space = asoc->smallest_mtu - ovh;
10272                 }
10273                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10274                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10275                             0xff, 0, cnt_of_skipped,
10276                             asoc->advanced_peer_ack_point);
10277
10278                 }
10279                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10280                 if (cnt_of_space < space_needed) {
10281                         /*-
10282                          * ok we must trim down the chunk by lowering the
10283                          * advance peer ack point.
10284                          */
10285                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10286                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10287                                     0xff, 0xff, cnt_of_space,
10288                                     space_needed);
10289                         }
10290                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10291                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10292                         /*-
10293                          * Go through and find the TSN that will be the one
10294                          * we report.
10295                          */
10296                         at = TAILQ_FIRST(&asoc->sent_queue);
10297                         if (at != NULL) {
10298                                 for (i = 0; i < cnt_of_skipped; i++) {
10299                                         tp1 = TAILQ_NEXT(at, sctp_next);
10300                                         if (tp1 == NULL) {
10301                                                 break;
10302                                         }
10303                                         at = tp1;
10304                                 }
10305                         }
10306                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10307                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10308                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10309                                     asoc->advanced_peer_ack_point);
10310                         }
10311                         last = at;
10312                         /*-
10313                          * last now points to last one I can report, update
10314                          * peer ack point
10315                          */
10316                         if (last)
10317                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10318                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10319                             cnt_of_skipped * sizeof(struct sctp_strseq);
10320                 }
10321                 chk->send_size = space_needed;
10322                 /* Setup the chunk */
10323                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10324                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10325                 fwdtsn->ch.chunk_flags = 0;
10326                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10327                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10328                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10329                 fwdtsn++;
10330                 /*-
10331                  * Move pointer to after the fwdtsn and transfer to the
10332                  * strseq pointer.
10333                  */
10334                 strseq = (struct sctp_strseq *)fwdtsn;
10335                 /*-
10336                  * Now populate the strseq list. This is done blindly
10337                  * without pulling out duplicate stream info. This is
10338                  * inefficent but won't harm the process since the peer will
10339                  * look at these in sequence and will thus release anything.
10340                  * It could mean we exceed the PMTU and chop off some that
10341                  * we could have included.. but this is unlikely (aka 1432/4
10342                  * would mean 300+ stream seq's would have to be reported in
10343                  * one FWD-TSN. With a bit of work we can later FIX this to
10344                  * optimize and pull out duplcates.. but it does add more
10345                  * overhead. So for now... not!
10346                  */
10347                 at = TAILQ_FIRST(&asoc->sent_queue);
10348                 for (i = 0; i < cnt_of_skipped; i++) {
10349                         tp1 = TAILQ_NEXT(at, sctp_next);
10350                         if (tp1 == NULL)
10351                                 break;
10352                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10353                                 /* We don't report these */
10354                                 i--;
10355                                 at = tp1;
10356                                 continue;
10357                         }
10358                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10359                                 at->rec.data.fwd_tsn_cnt = 0;
10360                         }
10361                         strseq->stream = ntohs(at->rec.data.stream_number);
10362                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10363                         strseq++;
10364                         at = tp1;
10365                 }
10366         }
10367         return;
10368 }
10369
10370 void
10371 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10372 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10373     SCTP_UNUSED
10374 #endif
10375 )
10376 {
10377         /*-
10378          * Queue up a SACK or NR-SACK in the control queue.
10379          * We must first check to see if a SACK or NR-SACK is
10380          * somehow on the control queue.
10381          * If so, we will take and and remove the old one.
10382          */
10383         struct sctp_association *asoc;
10384         struct sctp_tmit_chunk *chk, *a_chk;
10385         struct sctp_sack_chunk *sack;
10386         struct sctp_nr_sack_chunk *nr_sack;
10387         struct sctp_gap_ack_block *gap_descriptor;
10388         struct sack_track *selector;
10389         int mergeable = 0;
10390         int offset;
10391         caddr_t limit;
10392         uint32_t *dup;
10393         int limit_reached = 0;
10394         unsigned int i, siz, j;
10395         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10396         int num_dups = 0;
10397         int space_req;
10398         uint32_t highest_tsn;
10399         uint8_t flags;
10400         uint8_t type;
10401         uint8_t tsn_map;
10402
10403         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10404             (stcb->asoc.peer_supports_nr_sack == 1)) {
10405                 type = SCTP_NR_SELECTIVE_ACK;
10406         } else {
10407                 type = SCTP_SELECTIVE_ACK;
10408         }
10409         a_chk = NULL;
10410         asoc = &stcb->asoc;
10411         SCTP_TCB_LOCK_ASSERT(stcb);
10412         if (asoc->last_data_chunk_from == NULL) {
10413                 /* Hmm we never received anything */
10414                 return;
10415         }
10416         sctp_slide_mapping_arrays(stcb);
10417         sctp_set_rwnd(stcb, asoc);
10418         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10419                 if (chk->rec.chunk_id.id == type) {
10420                         /* Hmm, found a sack already on queue, remove it */
10421                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10422                         asoc->ctrl_queue_cnt--;
10423                         a_chk = chk;
10424                         if (a_chk->data) {
10425                                 sctp_m_freem(a_chk->data);
10426                                 a_chk->data = NULL;
10427                         }
10428                         if (a_chk->whoTo) {
10429                                 sctp_free_remote_addr(a_chk->whoTo);
10430                                 a_chk->whoTo = NULL;
10431                         }
10432                         break;
10433                 }
10434         }
10435         if (a_chk == NULL) {
10436                 sctp_alloc_a_chunk(stcb, a_chk);
10437                 if (a_chk == NULL) {
10438                         /* No memory so we drop the idea, and set a timer */
10439                         if (stcb->asoc.delayed_ack) {
10440                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10441                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10442                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10443                                     stcb->sctp_ep, stcb, NULL);
10444                         } else {
10445                                 stcb->asoc.send_sack = 1;
10446                         }
10447                         return;
10448                 }
10449                 a_chk->copy_by_ref = 0;
10450                 a_chk->rec.chunk_id.id = type;
10451                 a_chk->rec.chunk_id.can_take_data = 1;
10452         }
10453         /* Clear our pkt counts */
10454         asoc->data_pkts_seen = 0;
10455
10456         a_chk->asoc = asoc;
10457         a_chk->snd_count = 0;
10458         a_chk->send_size = 0;   /* fill in later */
10459         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10460         a_chk->whoTo = NULL;
10461
10462         if ((asoc->numduptsns) ||
10463             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10464                 /*-
10465                  * Ok, we have some duplicates or the destination for the
10466                  * sack is unreachable, lets see if we can select an
10467                  * alternate than asoc->last_data_chunk_from
10468                  */
10469                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10470                     (asoc->used_alt_onsack > asoc->numnets)) {
10471                         /* We used an alt last time, don't this time */
10472                         a_chk->whoTo = NULL;
10473                 } else {
10474                         asoc->used_alt_onsack++;
10475                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10476                 }
10477                 if (a_chk->whoTo == NULL) {
10478                         /* Nope, no alternate */
10479                         a_chk->whoTo = asoc->last_data_chunk_from;
10480                         asoc->used_alt_onsack = 0;
10481                 }
10482         } else {
10483                 /*
10484                  * No duplicates so we use the last place we received data
10485                  * from.
10486                  */
10487                 asoc->used_alt_onsack = 0;
10488                 a_chk->whoTo = asoc->last_data_chunk_from;
10489         }
10490         if (a_chk->whoTo) {
10491                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10492         }
10493         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10494                 highest_tsn = asoc->highest_tsn_inside_map;
10495         } else {
10496                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10497         }
10498         if (highest_tsn == asoc->cumulative_tsn) {
10499                 /* no gaps */
10500                 if (type == SCTP_SELECTIVE_ACK) {
10501                         space_req = sizeof(struct sctp_sack_chunk);
10502                 } else {
10503                         space_req = sizeof(struct sctp_nr_sack_chunk);
10504                 }
10505         } else {
10506                 /* gaps get a cluster */
10507                 space_req = MCLBYTES;
10508         }
10509         /* Ok now lets formulate a MBUF with our sack */
10510         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10511         if ((a_chk->data == NULL) ||
10512             (a_chk->whoTo == NULL)) {
10513                 /* rats, no mbuf memory */
10514                 if (a_chk->data) {
10515                         /* was a problem with the destination */
10516                         sctp_m_freem(a_chk->data);
10517                         a_chk->data = NULL;
10518                 }
10519                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10520                 /* sa_ignore NO_NULL_CHK */
10521                 if (stcb->asoc.delayed_ack) {
10522                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10523                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10524                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10525                             stcb->sctp_ep, stcb, NULL);
10526                 } else {
10527                         stcb->asoc.send_sack = 1;
10528                 }
10529                 return;
10530         }
10531         /* ok, lets go through and fill it in */
10532         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10533         space = M_TRAILINGSPACE(a_chk->data);
10534         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10535                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10536         }
10537         limit = mtod(a_chk->data, caddr_t);
10538         limit += space;
10539
10540         flags = 0;
10541
10542         if ((asoc->sctp_cmt_on_off > 0) &&
10543             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10544                 /*-
10545                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10546                  * received, then set high bit to 1, else 0. Reset
10547                  * pkts_rcvd.
10548                  */
10549                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10550                 asoc->cmt_dac_pkts_rcvd = 0;
10551         }
10552 #ifdef SCTP_ASOCLOG_OF_TSNS
10553         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10554         stcb->asoc.cumack_log_atsnt++;
10555         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10556                 stcb->asoc.cumack_log_atsnt = 0;
10557         }
10558 #endif
10559         /* reset the readers interpretation */
10560         stcb->freed_by_sorcv_sincelast = 0;
10561
10562         if (type == SCTP_SELECTIVE_ACK) {
10563                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10564                 nr_sack = NULL;
10565                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10566                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10567                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10568                 } else {
10569                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10570                 }
10571         } else {
10572                 sack = NULL;
10573                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10574                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10575                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10576                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10577                 } else {
10578                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10579                 }
10580         }
10581
10582         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10583                 offset = 1;
10584         } else {
10585                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10586         }
10587         if (((type == SCTP_SELECTIVE_ACK) &&
10588             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10589             ((type == SCTP_NR_SELECTIVE_ACK) &&
10590             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10591                 /* we have a gap .. maybe */
10592                 for (i = 0; i < siz; i++) {
10593                         tsn_map = asoc->mapping_array[i];
10594                         if (type == SCTP_SELECTIVE_ACK) {
10595                                 tsn_map |= asoc->nr_mapping_array[i];
10596                         }
10597                         if (i == 0) {
10598                                 /*
10599                                  * Clear all bits corresponding to TSNs
10600                                  * smaller or equal to the cumulative TSN.
10601                                  */
10602                                 tsn_map &= (~0 << (1 - offset));
10603                         }
10604                         selector = &sack_array[tsn_map];
10605                         if (mergeable && selector->right_edge) {
10606                                 /*
10607                                  * Backup, left and right edges were ok to
10608                                  * merge.
10609                                  */
10610                                 num_gap_blocks--;
10611                                 gap_descriptor--;
10612                         }
10613                         if (selector->num_entries == 0)
10614                                 mergeable = 0;
10615                         else {
10616                                 for (j = 0; j < selector->num_entries; j++) {
10617                                         if (mergeable && selector->right_edge) {
10618                                                 /*
10619                                                  * do a merge by NOT setting
10620                                                  * the left side
10621                                                  */
10622                                                 mergeable = 0;
10623                                         } else {
10624                                                 /*
10625                                                  * no merge, set the left
10626                                                  * side
10627                                                  */
10628                                                 mergeable = 0;
10629                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10630                                         }
10631                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10632                                         num_gap_blocks++;
10633                                         gap_descriptor++;
10634                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10635                                                 /* no more room */
10636                                                 limit_reached = 1;
10637                                                 break;
10638                                         }
10639                                 }
10640                                 if (selector->left_edge) {
10641                                         mergeable = 1;
10642                                 }
10643                         }
10644                         if (limit_reached) {
10645                                 /* Reached the limit stop */
10646                                 break;
10647                         }
10648                         offset += 8;
10649                 }
10650         }
10651         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10652             (limit_reached == 0)) {
10653
10654                 mergeable = 0;
10655
10656                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10657                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10658                 } else {
10659                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10660                 }
10661
10662                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10663                         offset = 1;
10664                 } else {
10665                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10666                 }
10667                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10668                         /* we have a gap .. maybe */
10669                         for (i = 0; i < siz; i++) {
10670                                 tsn_map = asoc->nr_mapping_array[i];
10671                                 if (i == 0) {
10672                                         /*
10673                                          * Clear all bits corresponding to
10674                                          * TSNs smaller or equal to the
10675                                          * cumulative TSN.
10676                                          */
10677                                         tsn_map &= (~0 << (1 - offset));
10678                                 }
10679                                 selector = &sack_array[tsn_map];
10680                                 if (mergeable && selector->right_edge) {
10681                                         /*
10682                                          * Backup, left and right edges were
10683                                          * ok to merge.
10684                                          */
10685                                         num_nr_gap_blocks--;
10686                                         gap_descriptor--;
10687                                 }
10688                                 if (selector->num_entries == 0)
10689                                         mergeable = 0;
10690                                 else {
10691                                         for (j = 0; j < selector->num_entries; j++) {
10692                                                 if (mergeable && selector->right_edge) {
10693                                                         /*
10694                                                          * do a merge by NOT
10695                                                          * setting the left
10696                                                          * side
10697                                                          */
10698                                                         mergeable = 0;
10699                                                 } else {
10700                                                         /*
10701                                                          * no merge, set the
10702                                                          * left side
10703                                                          */
10704                                                         mergeable = 0;
10705                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10706                                                 }
10707                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10708                                                 num_nr_gap_blocks++;
10709                                                 gap_descriptor++;
10710                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10711                                                         /* no more room */
10712                                                         limit_reached = 1;
10713                                                         break;
10714                                                 }
10715                                         }
10716                                         if (selector->left_edge) {
10717                                                 mergeable = 1;
10718                                         }
10719                                 }
10720                                 if (limit_reached) {
10721                                         /* Reached the limit stop */
10722                                         break;
10723                                 }
10724                                 offset += 8;
10725                         }
10726                 }
10727         }
10728         /* now we must add any dups we are going to report. */
10729         if ((limit_reached == 0) && (asoc->numduptsns)) {
10730                 dup = (uint32_t *) gap_descriptor;
10731                 for (i = 0; i < asoc->numduptsns; i++) {
10732                         *dup = htonl(asoc->dup_tsns[i]);
10733                         dup++;
10734                         num_dups++;
10735                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10736                                 /* no more room */
10737                                 break;
10738                         }
10739                 }
10740                 asoc->numduptsns = 0;
10741         }
10742         /*
10743          * now that the chunk is prepared queue it to the control chunk
10744          * queue.
10745          */
10746         if (type == SCTP_SELECTIVE_ACK) {
10747                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10748                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10749                     num_dups * sizeof(int32_t);
10750                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10751                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10752                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10753                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10754                 sack->sack.num_dup_tsns = htons(num_dups);
10755                 sack->ch.chunk_type = type;
10756                 sack->ch.chunk_flags = flags;
10757                 sack->ch.chunk_length = htons(a_chk->send_size);
10758         } else {
10759                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10760                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10761                     num_dups * sizeof(int32_t);
10762                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10763                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10764                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10765                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10766                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10767                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10768                 nr_sack->nr_sack.reserved = 0;
10769                 nr_sack->ch.chunk_type = type;
10770                 nr_sack->ch.chunk_flags = flags;
10771                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10772         }
10773         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10774         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10775         asoc->ctrl_queue_cnt++;
10776         asoc->send_sack = 0;
10777         SCTP_STAT_INCR(sctps_sendsacks);
10778         return;
10779 }
10780
10781 void
10782 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10783 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10784     SCTP_UNUSED
10785 #endif
10786 )
10787 {
10788         struct mbuf *m_abort;
10789         struct mbuf *m_out = NULL, *m_end = NULL;
10790         struct sctp_abort_chunk *abort = NULL;
10791         int sz;
10792         uint32_t auth_offset = 0;
10793         struct sctp_auth_chunk *auth = NULL;
10794         struct sctp_nets *net;
10795
10796         /*-
10797          * Add an AUTH chunk, if chunk requires it and save the offset into
10798          * the chain for AUTH
10799          */
10800         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10801             stcb->asoc.peer_auth_chunks)) {
10802                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10803                     stcb, SCTP_ABORT_ASSOCIATION);
10804                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10805         }
10806         SCTP_TCB_LOCK_ASSERT(stcb);
10807         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10808         if (m_abort == NULL) {
10809                 /* no mbuf's */
10810                 if (m_out)
10811                         sctp_m_freem(m_out);
10812                 return;
10813         }
10814         /* link in any error */
10815         SCTP_BUF_NEXT(m_abort) = operr;
10816         sz = 0;
10817         if (operr) {
10818                 struct mbuf *n;
10819
10820                 n = operr;
10821                 while (n) {
10822                         sz += SCTP_BUF_LEN(n);
10823                         n = SCTP_BUF_NEXT(n);
10824                 }
10825         }
10826         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10827         if (m_out == NULL) {
10828                 /* NO Auth chunk prepended, so reserve space in front */
10829                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10830                 m_out = m_abort;
10831         } else {
10832                 /* Put AUTH chunk at the front of the chain */
10833                 SCTP_BUF_NEXT(m_end) = m_abort;
10834         }
10835         if (stcb->asoc.alternate) {
10836                 net = stcb->asoc.alternate;
10837         } else {
10838                 net = stcb->asoc.primary_destination;
10839         }
10840         /* fill in the ABORT chunk */
10841         abort = mtod(m_abort, struct sctp_abort_chunk *);
10842         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10843         abort->ch.chunk_flags = 0;
10844         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10845
10846         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10847             (struct sockaddr *)&net->ro._l_addr,
10848             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10849             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10850             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10851         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10852 }
10853
10854 void
10855 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10856     struct sctp_nets *net,
10857     int reflect_vtag)
10858 {
10859         /* formulate and SEND a SHUTDOWN-COMPLETE */
10860         struct mbuf *m_shutdown_comp;
10861         struct sctp_shutdown_complete_chunk *shutdown_complete;
10862         uint32_t vtag;
10863         uint8_t flags;
10864
10865         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10866         if (m_shutdown_comp == NULL) {
10867                 /* no mbuf's */
10868                 return;
10869         }
10870         if (reflect_vtag) {
10871                 flags = SCTP_HAD_NO_TCB;
10872                 vtag = stcb->asoc.my_vtag;
10873         } else {
10874                 flags = 0;
10875                 vtag = stcb->asoc.peer_vtag;
10876         }
10877         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10878         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10879         shutdown_complete->ch.chunk_flags = flags;
10880         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10881         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10882         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10883             (struct sockaddr *)&net->ro._l_addr,
10884             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10885             stcb->sctp_ep->sctp_lport, stcb->rport,
10886             htonl(vtag),
10887             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10888         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10889         return;
10890 }
10891
10892 void
10893 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
10894     uint32_t vrf_id, uint16_t port)
10895 {
10896         /* formulate and SEND a SHUTDOWN-COMPLETE */
10897         struct mbuf *o_pak;
10898         struct mbuf *mout;
10899         struct ip *iph;
10900         struct udphdr *udp = NULL;
10901         int offset_out, len, mlen;
10902         struct sctp_shutdown_complete_msg *comp_cp;
10903
10904 #ifdef INET
10905         struct ip *iph_out;
10906
10907 #endif
10908 #ifdef INET6
10909         struct ip6_hdr *ip6, *ip6_out;
10910
10911 #endif
10912
10913         iph = mtod(m, struct ip *);
10914         switch (iph->ip_v) {
10915 #ifdef INET
10916         case IPVERSION:
10917                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10918                 break;
10919 #endif
10920 #ifdef INET6
10921         case IPV6_VERSION >> 4:
10922                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10923                 break;
10924 #endif
10925         default:
10926                 return;
10927         }
10928         if (port) {
10929                 len += sizeof(struct udphdr);
10930         }
10931         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10932         if (mout == NULL) {
10933                 return;
10934         }
10935         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10936         SCTP_BUF_LEN(mout) = len;
10937         SCTP_BUF_NEXT(mout) = NULL;
10938         if (m->m_flags & M_FLOWID) {
10939                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10940                 mout->m_flags |= M_FLOWID;
10941         }
10942 #ifdef INET
10943         iph_out = NULL;
10944 #endif
10945 #ifdef INET6
10946         ip6_out = NULL;
10947 #endif
10948         offset_out = 0;
10949
10950         switch (iph->ip_v) {
10951 #ifdef INET
10952         case IPVERSION:
10953                 iph_out = mtod(mout, struct ip *);
10954
10955                 /* Fill in the IP header for the ABORT */
10956                 iph_out->ip_v = IPVERSION;
10957                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10958                 iph_out->ip_tos = (u_char)0;
10959                 iph_out->ip_id = 0;
10960                 iph_out->ip_off = 0;
10961                 iph_out->ip_ttl = MAXTTL;
10962                 if (port) {
10963                         iph_out->ip_p = IPPROTO_UDP;
10964                 } else {
10965                         iph_out->ip_p = IPPROTO_SCTP;
10966                 }
10967                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10968                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10969
10970                 /* let IP layer calculate this */
10971                 iph_out->ip_sum = 0;
10972                 offset_out += sizeof(*iph_out);
10973                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10974                     (caddr_t)iph_out + offset_out);
10975                 break;
10976 #endif
10977 #ifdef INET6
10978         case IPV6_VERSION >> 4:
10979                 ip6 = (struct ip6_hdr *)iph;
10980                 ip6_out = mtod(mout, struct ip6_hdr *);
10981
10982                 /* Fill in the IPv6 header for the ABORT */
10983                 ip6_out->ip6_flow = ip6->ip6_flow;
10984                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10985                 if (port) {
10986                         ip6_out->ip6_nxt = IPPROTO_UDP;
10987                 } else {
10988                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10989                 }
10990                 ip6_out->ip6_src = ip6->ip6_dst;
10991                 ip6_out->ip6_dst = ip6->ip6_src;
10992                 /*
10993                  * ?? The old code had both the iph len + payload, I think
10994                  * this is wrong and would never have worked
10995                  */
10996                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10997                 offset_out += sizeof(*ip6_out);
10998                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10999                     (caddr_t)ip6_out + offset_out);
11000                 break;
11001 #endif                          /* INET6 */
11002         default:
11003                 /* Currently not supported. */
11004                 sctp_m_freem(mout);
11005                 return;
11006         }
11007         if (port) {
11008                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11009                         sctp_m_freem(mout);
11010                         return;
11011                 }
11012                 udp = (struct udphdr *)comp_cp;
11013                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11014                 udp->uh_dport = port;
11015                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
11016 #ifdef INET
11017                 if (iph_out) {
11018                         if (V_udp_cksum) {
11019                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11020                         } else {
11021                                 udp->uh_sum = 0;
11022                         }
11023                 }
11024 #endif
11025                 offset_out += sizeof(struct udphdr);
11026                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
11027         }
11028         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11029                 /* no mbuf's */
11030                 sctp_m_freem(mout);
11031                 return;
11032         }
11033         /* Now copy in and fill in the ABORT tags etc. */
11034         comp_cp->sh.src_port = sh->dest_port;
11035         comp_cp->sh.dest_port = sh->src_port;
11036         comp_cp->sh.checksum = 0;
11037         comp_cp->sh.v_tag = sh->v_tag;
11038         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
11039         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11040         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11041
11042 #ifdef INET
11043         if (iph_out != NULL) {
11044                 sctp_route_t ro;
11045                 int ret;
11046
11047                 mlen = SCTP_BUF_LEN(mout);
11048                 bzero(&ro, sizeof ro);
11049                 /* set IPv4 length */
11050                 iph_out->ip_len = mlen;
11051 #ifdef  SCTP_PACKET_LOGGING
11052                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11053                         sctp_packet_log(mout, mlen);
11054 #endif
11055                 if (port) {
11056 #if defined(SCTP_WITH_NO_CSUM)
11057                         SCTP_STAT_INCR(sctps_sendnocrc);
11058 #else
11059                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
11060                         SCTP_STAT_INCR(sctps_sendswcrc);
11061 #endif
11062                         if (V_udp_cksum) {
11063                                 SCTP_ENABLE_UDP_CSUM(mout);
11064                         }
11065                 } else {
11066 #if defined(SCTP_WITH_NO_CSUM)
11067                         SCTP_STAT_INCR(sctps_sendnocrc);
11068 #else
11069                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11070                         mout->m_pkthdr.csum_data = 0;
11071                         SCTP_STAT_INCR(sctps_sendhwcrc);
11072 #endif
11073                 }
11074                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11075                 /* out it goes */
11076                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11077
11078                 /* Free the route if we got one back */
11079                 if (ro.ro_rt)
11080                         RTFREE(ro.ro_rt);
11081         }
11082 #endif
11083 #ifdef INET6
11084         if (ip6_out != NULL) {
11085                 struct route_in6 ro;
11086                 int ret;
11087                 struct ifnet *ifp = NULL;
11088
11089                 bzero(&ro, sizeof(ro));
11090                 mlen = SCTP_BUF_LEN(mout);
11091 #ifdef  SCTP_PACKET_LOGGING
11092                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11093                         sctp_packet_log(mout, mlen);
11094 #endif
11095                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11096                 if (port) {
11097 #if defined(SCTP_WITH_NO_CSUM)
11098                         SCTP_STAT_INCR(sctps_sendnocrc);
11099 #else
11100                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11101                         SCTP_STAT_INCR(sctps_sendswcrc);
11102 #endif
11103                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
11104                                 udp->uh_sum = 0xffff;
11105                         }
11106                 } else {
11107 #if defined(SCTP_WITH_NO_CSUM)
11108                         SCTP_STAT_INCR(sctps_sendnocrc);
11109 #else
11110                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11111                         mout->m_pkthdr.csum_data = 0;
11112                         SCTP_STAT_INCR(sctps_sendhwcrc);
11113 #endif
11114                 }
11115                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11116
11117                 /* Free the route if we got one back */
11118                 if (ro.ro_rt)
11119                         RTFREE(ro.ro_rt);
11120         }
11121 #endif
11122         SCTP_STAT_INCR(sctps_sendpackets);
11123         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11124         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11125         return;
11126
11127 }
11128
11129 void
11130 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11131 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11132     SCTP_UNUSED
11133 #endif
11134 )
11135 {
11136         struct sctp_tmit_chunk *chk;
11137         struct sctp_heartbeat_chunk *hb;
11138         struct timeval now;
11139
11140         SCTP_TCB_LOCK_ASSERT(stcb);
11141         if (net == NULL) {
11142                 return;
11143         }
11144         (void)SCTP_GETTIME_TIMEVAL(&now);
11145         switch (net->ro._l_addr.sa.sa_family) {
11146 #ifdef INET
11147         case AF_INET:
11148                 break;
11149 #endif
11150 #ifdef INET6
11151         case AF_INET6:
11152                 break;
11153 #endif
11154         default:
11155                 return;
11156         }
11157         sctp_alloc_a_chunk(stcb, chk);
11158         if (chk == NULL) {
11159                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11160                 return;
11161         }
11162         chk->copy_by_ref = 0;
11163         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11164         chk->rec.chunk_id.can_take_data = 1;
11165         chk->asoc = &stcb->asoc;
11166         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11167
11168         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11169         if (chk->data == NULL) {
11170                 sctp_free_a_chunk(stcb, chk, so_locked);
11171                 return;
11172         }
11173         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11174         SCTP_BUF_LEN(chk->data) = chk->send_size;
11175         chk->sent = SCTP_DATAGRAM_UNSENT;
11176         chk->snd_count = 0;
11177         chk->whoTo = net;
11178         atomic_add_int(&chk->whoTo->ref_count, 1);
11179         /* Now we have a mbuf that we can fill in with the details */
11180         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11181         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11182         /* fill out chunk header */
11183         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11184         hb->ch.chunk_flags = 0;
11185         hb->ch.chunk_length = htons(chk->send_size);
11186         /* Fill out hb parameter */
11187         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11188         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11189         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11190         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11191         /* Did our user request this one, put it in */
11192         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11193         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11194         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11195                 /*
11196                  * we only take from the entropy pool if the address is not
11197                  * confirmed.
11198                  */
11199                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11200                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11201         } else {
11202                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11203                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11204         }
11205         switch (net->ro._l_addr.sa.sa_family) {
11206 #ifdef INET
11207         case AF_INET:
11208                 memcpy(hb->heartbeat.hb_info.address,
11209                     &net->ro._l_addr.sin.sin_addr,
11210                     sizeof(net->ro._l_addr.sin.sin_addr));
11211                 break;
11212 #endif
11213 #ifdef INET6
11214         case AF_INET6:
11215                 memcpy(hb->heartbeat.hb_info.address,
11216                     &net->ro._l_addr.sin6.sin6_addr,
11217                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11218                 break;
11219 #endif
11220         default:
11221                 return;
11222                 break;
11223         }
11224         net->hb_responded = 0;
11225         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11226         stcb->asoc.ctrl_queue_cnt++;
11227         SCTP_STAT_INCR(sctps_sendheartbeat);
11228         return;
11229 }
11230
11231 void
11232 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11233     uint32_t high_tsn)
11234 {
11235         struct sctp_association *asoc;
11236         struct sctp_ecne_chunk *ecne;
11237         struct sctp_tmit_chunk *chk;
11238
11239         if (net == NULL) {
11240                 return;
11241         }
11242         asoc = &stcb->asoc;
11243         SCTP_TCB_LOCK_ASSERT(stcb);
11244         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11245                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11246                         /* found a previous ECN_ECHO update it if needed */
11247                         uint32_t cnt, ctsn;
11248
11249                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11250                         ctsn = ntohl(ecne->tsn);
11251                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11252                                 ecne->tsn = htonl(high_tsn);
11253                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11254                         }
11255                         cnt = ntohl(ecne->num_pkts_since_cwr);
11256                         cnt++;
11257                         ecne->num_pkts_since_cwr = htonl(cnt);
11258                         return;
11259                 }
11260         }
11261         /* nope could not find one to update so we must build one */
11262         sctp_alloc_a_chunk(stcb, chk);
11263         if (chk == NULL) {
11264                 return;
11265         }
11266         chk->copy_by_ref = 0;
11267         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11268         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11269         chk->rec.chunk_id.can_take_data = 0;
11270         chk->asoc = &stcb->asoc;
11271         chk->send_size = sizeof(struct sctp_ecne_chunk);
11272         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11273         if (chk->data == NULL) {
11274                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11275                 return;
11276         }
11277         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11278         SCTP_BUF_LEN(chk->data) = chk->send_size;
11279         chk->sent = SCTP_DATAGRAM_UNSENT;
11280         chk->snd_count = 0;
11281         chk->whoTo = net;
11282         atomic_add_int(&chk->whoTo->ref_count, 1);
11283
11284         stcb->asoc.ecn_echo_cnt_onq++;
11285         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11286         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11287         ecne->ch.chunk_flags = 0;
11288         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11289         ecne->tsn = htonl(high_tsn);
11290         ecne->num_pkts_since_cwr = htonl(1);
11291         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11292         asoc->ctrl_queue_cnt++;
11293 }
11294
11295 void
11296 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11297     struct mbuf *m, int iphlen, int bad_crc)
11298 {
11299         struct sctp_association *asoc;
11300         struct sctp_pktdrop_chunk *drp;
11301         struct sctp_tmit_chunk *chk;
11302         uint8_t *datap;
11303         int len;
11304         int was_trunc = 0;
11305         struct ip *iph;
11306
11307 #ifdef INET6
11308         struct ip6_hdr *ip6h;
11309
11310 #endif
11311         int fullsz = 0, extra = 0;
11312         long spc;
11313         int offset;
11314         struct sctp_chunkhdr *ch, chunk_buf;
11315         unsigned int chk_length;
11316
11317         if (!stcb) {
11318                 return;
11319         }
11320         asoc = &stcb->asoc;
11321         SCTP_TCB_LOCK_ASSERT(stcb);
11322         if (asoc->peer_supports_pktdrop == 0) {
11323                 /*-
11324                  * peer must declare support before I send one.
11325                  */
11326                 return;
11327         }
11328         if (stcb->sctp_socket == NULL) {
11329                 return;
11330         }
11331         sctp_alloc_a_chunk(stcb, chk);
11332         if (chk == NULL) {
11333                 return;
11334         }
11335         chk->copy_by_ref = 0;
11336         iph = mtod(m, struct ip *);
11337         if (iph == NULL) {
11338                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11339                 return;
11340         }
11341         switch (iph->ip_v) {
11342 #ifdef INET
11343         case IPVERSION:
11344                 /* IPv4 */
11345                 len = chk->send_size = iph->ip_len;
11346                 break;
11347 #endif
11348 #ifdef INET6
11349         case IPV6_VERSION >> 4:
11350                 /* IPv6 */
11351                 ip6h = mtod(m, struct ip6_hdr *);
11352                 len = chk->send_size = htons(ip6h->ip6_plen);
11353                 break;
11354 #endif
11355         default:
11356                 return;
11357         }
11358         /* Validate that we do not have an ABORT in here. */
11359         offset = iphlen + sizeof(struct sctphdr);
11360         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11361             sizeof(*ch), (uint8_t *) & chunk_buf);
11362         while (ch != NULL) {
11363                 chk_length = ntohs(ch->chunk_length);
11364                 if (chk_length < sizeof(*ch)) {
11365                         /* break to abort land */
11366                         break;
11367                 }
11368                 switch (ch->chunk_type) {
11369                 case SCTP_PACKET_DROPPED:
11370                 case SCTP_ABORT_ASSOCIATION:
11371                 case SCTP_INITIATION_ACK:
11372                         /**
11373                          * We don't respond with an PKT-DROP to an ABORT
11374                          * or PKT-DROP. We also do not respond to an
11375                          * INIT-ACK, because we can't know if the initiation
11376                          * tag is correct or not.
11377                          */
11378                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11379                         return;
11380                 default:
11381                         break;
11382                 }
11383                 offset += SCTP_SIZE32(chk_length);
11384                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11385                     sizeof(*ch), (uint8_t *) & chunk_buf);
11386         }
11387
11388         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11389             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11390                 /*
11391                  * only send 1 mtu worth, trim off the excess on the end.
11392                  */
11393                 fullsz = len - extra;
11394                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11395                 was_trunc = 1;
11396         }
11397         chk->asoc = &stcb->asoc;
11398         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11399         if (chk->data == NULL) {
11400 jump_out:
11401                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11402                 return;
11403         }
11404         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11405         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11406         if (drp == NULL) {
11407                 sctp_m_freem(chk->data);
11408                 chk->data = NULL;
11409                 goto jump_out;
11410         }
11411         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11412             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11413         chk->book_size_scale = 0;
11414         if (was_trunc) {
11415                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11416                 drp->trunc_len = htons(fullsz);
11417                 /*
11418                  * Len is already adjusted to size minus overhead above take
11419                  * out the pkt_drop chunk itself from it.
11420                  */
11421                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11422                 len = chk->send_size;
11423         } else {
11424                 /* no truncation needed */
11425                 drp->ch.chunk_flags = 0;
11426                 drp->trunc_len = htons(0);
11427         }
11428         if (bad_crc) {
11429                 drp->ch.chunk_flags |= SCTP_BADCRC;
11430         }
11431         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11432         SCTP_BUF_LEN(chk->data) = chk->send_size;
11433         chk->sent = SCTP_DATAGRAM_UNSENT;
11434         chk->snd_count = 0;
11435         if (net) {
11436                 /* we should hit here */
11437                 chk->whoTo = net;
11438                 atomic_add_int(&chk->whoTo->ref_count, 1);
11439         } else {
11440                 chk->whoTo = NULL;
11441         }
11442         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11443         chk->rec.chunk_id.can_take_data = 1;
11444         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11445         drp->ch.chunk_length = htons(chk->send_size);
11446         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11447         if (spc < 0) {
11448                 spc = 0;
11449         }
11450         drp->bottle_bw = htonl(spc);
11451         if (asoc->my_rwnd) {
11452                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11453                     asoc->size_on_all_streams +
11454                     asoc->my_rwnd_control_len +
11455                     stcb->sctp_socket->so_rcv.sb_cc);
11456         } else {
11457                 /*-
11458                  * If my rwnd is 0, possibly from mbuf depletion as well as
11459                  * space used, tell the peer there is NO space aka onq == bw
11460                  */
11461                 drp->current_onq = htonl(spc);
11462         }
11463         drp->reserved = 0;
11464         datap = drp->data;
11465         m_copydata(m, iphlen, len, (caddr_t)datap);
11466         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11467         asoc->ctrl_queue_cnt++;
11468 }
11469
11470 void
11471 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11472 {
11473         struct sctp_association *asoc;
11474         struct sctp_cwr_chunk *cwr;
11475         struct sctp_tmit_chunk *chk;
11476
11477         asoc = &stcb->asoc;
11478         SCTP_TCB_LOCK_ASSERT(stcb);
11479         if (net == NULL) {
11480                 return;
11481         }
11482         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11483                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11484                         /*
11485                          * found a previous CWR queued to same destination
11486                          * update it if needed
11487                          */
11488                         uint32_t ctsn;
11489
11490                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11491                         ctsn = ntohl(cwr->tsn);
11492                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11493                                 cwr->tsn = htonl(high_tsn);
11494                         }
11495                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11496                                 /* Make sure override is carried */
11497                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11498                         }
11499                         return;
11500                 }
11501         }
11502         sctp_alloc_a_chunk(stcb, chk);
11503         if (chk == NULL) {
11504                 return;
11505         }
11506         chk->copy_by_ref = 0;
11507         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11508         chk->rec.chunk_id.can_take_data = 1;
11509         chk->asoc = &stcb->asoc;
11510         chk->send_size = sizeof(struct sctp_cwr_chunk);
11511         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11512         if (chk->data == NULL) {
11513                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11514                 return;
11515         }
11516         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11517         SCTP_BUF_LEN(chk->data) = chk->send_size;
11518         chk->sent = SCTP_DATAGRAM_UNSENT;
11519         chk->snd_count = 0;
11520         chk->whoTo = net;
11521         atomic_add_int(&chk->whoTo->ref_count, 1);
11522         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11523         cwr->ch.chunk_type = SCTP_ECN_CWR;
11524         cwr->ch.chunk_flags = override;
11525         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11526         cwr->tsn = htonl(high_tsn);
11527         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11528         asoc->ctrl_queue_cnt++;
11529 }
11530
11531 void
11532 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11533     int number_entries, uint16_t * list,
11534     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11535 {
11536         int len, old_len, i;
11537         struct sctp_stream_reset_out_request *req_out;
11538         struct sctp_chunkhdr *ch;
11539
11540         ch = mtod(chk->data, struct sctp_chunkhdr *);
11541
11542
11543         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11544
11545         /* get to new offset for the param. */
11546         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11547         /* now how long will this param be? */
11548         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11549         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11550         req_out->ph.param_length = htons(len);
11551         req_out->request_seq = htonl(seq);
11552         req_out->response_seq = htonl(resp_seq);
11553         req_out->send_reset_at_tsn = htonl(last_sent);
11554         if (number_entries) {
11555                 for (i = 0; i < number_entries; i++) {
11556                         req_out->list_of_streams[i] = htons(list[i]);
11557                 }
11558         }
11559         if (SCTP_SIZE32(len) > len) {
11560                 /*-
11561                  * Need to worry about the pad we may end up adding to the
11562                  * end. This is easy since the struct is either aligned to 4
11563                  * bytes or 2 bytes off.
11564                  */
11565                 req_out->list_of_streams[number_entries] = 0;
11566         }
11567         /* now fix the chunk length */
11568         ch->chunk_length = htons(len + old_len);
11569         chk->book_size = len + old_len;
11570         chk->book_size_scale = 0;
11571         chk->send_size = SCTP_SIZE32(chk->book_size);
11572         SCTP_BUF_LEN(chk->data) = chk->send_size;
11573         return;
11574 }
11575
11576
11577 void
11578 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11579     int number_entries, uint16_t * list,
11580     uint32_t seq)
11581 {
11582         int len, old_len, i;
11583         struct sctp_stream_reset_in_request *req_in;
11584         struct sctp_chunkhdr *ch;
11585
11586         ch = mtod(chk->data, struct sctp_chunkhdr *);
11587
11588
11589         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11590
11591         /* get to new offset for the param. */
11592         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11593         /* now how long will this param be? */
11594         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11595         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11596         req_in->ph.param_length = htons(len);
11597         req_in->request_seq = htonl(seq);
11598         if (number_entries) {
11599                 for (i = 0; i < number_entries; i++) {
11600                         req_in->list_of_streams[i] = htons(list[i]);
11601                 }
11602         }
11603         if (SCTP_SIZE32(len) > len) {
11604                 /*-
11605                  * Need to worry about the pad we may end up adding to the
11606                  * end. This is easy since the struct is either aligned to 4
11607                  * bytes or 2 bytes off.
11608                  */
11609                 req_in->list_of_streams[number_entries] = 0;
11610         }
11611         /* now fix the chunk length */
11612         ch->chunk_length = htons(len + old_len);
11613         chk->book_size = len + old_len;
11614         chk->book_size_scale = 0;
11615         chk->send_size = SCTP_SIZE32(chk->book_size);
11616         SCTP_BUF_LEN(chk->data) = chk->send_size;
11617         return;
11618 }
11619
11620
11621 void
11622 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11623     uint32_t seq)
11624 {
11625         int len, old_len;
11626         struct sctp_stream_reset_tsn_request *req_tsn;
11627         struct sctp_chunkhdr *ch;
11628
11629         ch = mtod(chk->data, struct sctp_chunkhdr *);
11630
11631
11632         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11633
11634         /* get to new offset for the param. */
11635         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11636         /* now how long will this param be? */
11637         len = sizeof(struct sctp_stream_reset_tsn_request);
11638         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11639         req_tsn->ph.param_length = htons(len);
11640         req_tsn->request_seq = htonl(seq);
11641
11642         /* now fix the chunk length */
11643         ch->chunk_length = htons(len + old_len);
11644         chk->send_size = len + old_len;
11645         chk->book_size = SCTP_SIZE32(chk->send_size);
11646         chk->book_size_scale = 0;
11647         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11648         return;
11649 }
11650
11651 void
11652 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11653     uint32_t resp_seq, uint32_t result)
11654 {
11655         int len, old_len;
11656         struct sctp_stream_reset_response *resp;
11657         struct sctp_chunkhdr *ch;
11658
11659         ch = mtod(chk->data, struct sctp_chunkhdr *);
11660
11661
11662         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11663
11664         /* get to new offset for the param. */
11665         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11666         /* now how long will this param be? */
11667         len = sizeof(struct sctp_stream_reset_response);
11668         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11669         resp->ph.param_length = htons(len);
11670         resp->response_seq = htonl(resp_seq);
11671         resp->result = ntohl(result);
11672
11673         /* now fix the chunk length */
11674         ch->chunk_length = htons(len + old_len);
11675         chk->book_size = len + old_len;
11676         chk->book_size_scale = 0;
11677         chk->send_size = SCTP_SIZE32(chk->book_size);
11678         SCTP_BUF_LEN(chk->data) = chk->send_size;
11679         return;
11680
11681 }
11682
11683
11684 void
11685 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11686     uint32_t resp_seq, uint32_t result,
11687     uint32_t send_una, uint32_t recv_next)
11688 {
11689         int len, old_len;
11690         struct sctp_stream_reset_response_tsn *resp;
11691         struct sctp_chunkhdr *ch;
11692
11693         ch = mtod(chk->data, struct sctp_chunkhdr *);
11694
11695
11696         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11697
11698         /* get to new offset for the param. */
11699         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11700         /* now how long will this param be? */
11701         len = sizeof(struct sctp_stream_reset_response_tsn);
11702         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11703         resp->ph.param_length = htons(len);
11704         resp->response_seq = htonl(resp_seq);
11705         resp->result = htonl(result);
11706         resp->senders_next_tsn = htonl(send_una);
11707         resp->receivers_next_tsn = htonl(recv_next);
11708
11709         /* now fix the chunk length */
11710         ch->chunk_length = htons(len + old_len);
11711         chk->book_size = len + old_len;
11712         chk->send_size = SCTP_SIZE32(chk->book_size);
11713         chk->book_size_scale = 0;
11714         SCTP_BUF_LEN(chk->data) = chk->send_size;
11715         return;
11716 }
11717
11718 static void
11719 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11720     uint32_t seq,
11721     uint16_t adding)
11722 {
11723         int len, old_len;
11724         struct sctp_chunkhdr *ch;
11725         struct sctp_stream_reset_add_strm *addstr;
11726
11727         ch = mtod(chk->data, struct sctp_chunkhdr *);
11728         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11729
11730         /* get to new offset for the param. */
11731         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11732         /* now how long will this param be? */
11733         len = sizeof(struct sctp_stream_reset_add_strm);
11734
11735         /* Fill it out. */
11736         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11737         addstr->ph.param_length = htons(len);
11738         addstr->request_seq = htonl(seq);
11739         addstr->number_of_streams = htons(adding);
11740         addstr->reserved = 0;
11741
11742         /* now fix the chunk length */
11743         ch->chunk_length = htons(len + old_len);
11744         chk->send_size = len + old_len;
11745         chk->book_size = SCTP_SIZE32(chk->send_size);
11746         chk->book_size_scale = 0;
11747         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11748         return;
11749 }
11750
11751 int
11752 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11753     int number_entries, uint16_t * list,
11754     uint8_t send_out_req,
11755     uint32_t resp_seq,
11756     uint8_t send_in_req,
11757     uint8_t send_tsn_req,
11758     uint8_t add_stream,
11759     uint16_t adding
11760 )
11761 {
11762
11763         struct sctp_association *asoc;
11764         struct sctp_tmit_chunk *chk;
11765         struct sctp_chunkhdr *ch;
11766         uint32_t seq;
11767
11768         asoc = &stcb->asoc;
11769         if (asoc->stream_reset_outstanding) {
11770                 /*-
11771                  * Already one pending, must get ACK back to clear the flag.
11772                  */
11773                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11774                 return (EBUSY);
11775         }
11776         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11777             (add_stream == 0)) {
11778                 /* nothing to do */
11779                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11780                 return (EINVAL);
11781         }
11782         if (send_tsn_req && (send_out_req || send_in_req)) {
11783                 /* error, can't do that */
11784                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11785                 return (EINVAL);
11786         }
11787         sctp_alloc_a_chunk(stcb, chk);
11788         if (chk == NULL) {
11789                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11790                 return (ENOMEM);
11791         }
11792         chk->copy_by_ref = 0;
11793         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11794         chk->rec.chunk_id.can_take_data = 0;
11795         chk->asoc = &stcb->asoc;
11796         chk->book_size = sizeof(struct sctp_chunkhdr);
11797         chk->send_size = SCTP_SIZE32(chk->book_size);
11798         chk->book_size_scale = 0;
11799
11800         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11801         if (chk->data == NULL) {
11802                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11803                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11804                 return (ENOMEM);
11805         }
11806         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11807
11808         /* setup chunk parameters */
11809         chk->sent = SCTP_DATAGRAM_UNSENT;
11810         chk->snd_count = 0;
11811         if (stcb->asoc.alternate) {
11812                 chk->whoTo = stcb->asoc.alternate;
11813         } else {
11814                 chk->whoTo = stcb->asoc.primary_destination;
11815         }
11816         atomic_add_int(&chk->whoTo->ref_count, 1);
11817         ch = mtod(chk->data, struct sctp_chunkhdr *);
11818         ch->chunk_type = SCTP_STREAM_RESET;
11819         ch->chunk_flags = 0;
11820         ch->chunk_length = htons(chk->book_size);
11821         SCTP_BUF_LEN(chk->data) = chk->send_size;
11822
11823         seq = stcb->asoc.str_reset_seq_out;
11824         if (send_out_req) {
11825                 sctp_add_stream_reset_out(chk, number_entries, list,
11826                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11827                 asoc->stream_reset_out_is_outstanding = 1;
11828                 seq++;
11829                 asoc->stream_reset_outstanding++;
11830         }
11831         if (add_stream) {
11832                 sctp_add_a_stream(chk, seq, adding);
11833                 seq++;
11834                 asoc->stream_reset_outstanding++;
11835         }
11836         if (send_in_req) {
11837                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11838                 asoc->stream_reset_outstanding++;
11839         }
11840         if (send_tsn_req) {
11841                 sctp_add_stream_reset_tsn(chk, seq);
11842                 asoc->stream_reset_outstanding++;
11843         }
11844         asoc->str_reset = chk;
11845
11846         /* insert the chunk for sending */
11847         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11848             chk,
11849             sctp_next);
11850         asoc->ctrl_queue_cnt++;
11851         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11852         return (0);
11853 }
11854
11855 void
11856 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11857     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11858 {
11859         /*-
11860          * Formulate the abort message, and send it back down.
11861          */
11862         struct mbuf *o_pak;
11863         struct mbuf *mout;
11864         struct sctp_abort_msg *abm;
11865         struct ip *iph;
11866         struct udphdr *udp;
11867         int iphlen_out, len;
11868
11869 #ifdef INET
11870         struct ip *iph_out;
11871
11872 #endif
11873 #ifdef INET6
11874         struct ip6_hdr *ip6, *ip6_out;
11875
11876 #endif
11877
11878         /* don't respond to ABORT with ABORT */
11879         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11880                 if (err_cause)
11881                         sctp_m_freem(err_cause);
11882                 return;
11883         }
11884         iph = mtod(m, struct ip *);
11885         switch (iph->ip_v) {
11886 #ifdef INET
11887         case IPVERSION:
11888                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11889                 break;
11890 #endif
11891 #ifdef INET6
11892         case IPV6_VERSION >> 4:
11893                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11894                 break;
11895 #endif
11896         default:
11897                 if (err_cause) {
11898                         sctp_m_freem(err_cause);
11899                 }
11900                 return;
11901         }
11902         if (port) {
11903                 len += sizeof(struct udphdr);
11904         }
11905         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11906         if (mout == NULL) {
11907                 if (err_cause) {
11908                         sctp_m_freem(err_cause);
11909                 }
11910                 return;
11911         }
11912         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11913         SCTP_BUF_LEN(mout) = len;
11914         SCTP_BUF_NEXT(mout) = err_cause;
11915         if (m->m_flags & M_FLOWID) {
11916                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11917                 mout->m_flags |= M_FLOWID;
11918         }
11919 #ifdef INET
11920         iph_out = NULL;
11921 #endif
11922 #ifdef INET6
11923         ip6_out = NULL;
11924 #endif
11925         switch (iph->ip_v) {
11926 #ifdef INET
11927         case IPVERSION:
11928                 iph_out = mtod(mout, struct ip *);
11929
11930                 /* Fill in the IP header for the ABORT */
11931                 iph_out->ip_v = IPVERSION;
11932                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11933                 iph_out->ip_tos = (u_char)0;
11934                 iph_out->ip_id = 0;
11935                 iph_out->ip_off = 0;
11936                 iph_out->ip_ttl = MAXTTL;
11937                 if (port) {
11938                         iph_out->ip_p = IPPROTO_UDP;
11939                 } else {
11940                         iph_out->ip_p = IPPROTO_SCTP;
11941                 }
11942                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11943                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11944                 /* let IP layer calculate this */
11945                 iph_out->ip_sum = 0;
11946
11947                 iphlen_out = sizeof(*iph_out);
11948                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11949                 break;
11950 #endif
11951 #ifdef INET6
11952         case IPV6_VERSION >> 4:
11953                 ip6 = (struct ip6_hdr *)iph;
11954                 ip6_out = mtod(mout, struct ip6_hdr *);
11955
11956                 /* Fill in the IP6 header for the ABORT */
11957                 ip6_out->ip6_flow = ip6->ip6_flow;
11958                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11959                 if (port) {
11960                         ip6_out->ip6_nxt = IPPROTO_UDP;
11961                 } else {
11962                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11963                 }
11964                 ip6_out->ip6_src = ip6->ip6_dst;
11965                 ip6_out->ip6_dst = ip6->ip6_src;
11966
11967                 iphlen_out = sizeof(*ip6_out);
11968                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11969                 break;
11970 #endif                          /* INET6 */
11971         default:
11972                 /* Currently not supported */
11973                 sctp_m_freem(mout);
11974                 return;
11975         }
11976
11977         udp = (struct udphdr *)abm;
11978         if (port) {
11979                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11980                         sctp_m_freem(mout);
11981                         return;
11982                 }
11983                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11984                 udp->uh_dport = port;
11985                 /* set udp->uh_ulen later */
11986                 udp->uh_sum = 0;
11987                 iphlen_out += sizeof(struct udphdr);
11988                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11989         }
11990         abm->sh.src_port = sh->dest_port;
11991         abm->sh.dest_port = sh->src_port;
11992         abm->sh.checksum = 0;
11993         if (vtag == 0) {
11994                 abm->sh.v_tag = sh->v_tag;
11995                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11996         } else {
11997                 abm->sh.v_tag = htonl(vtag);
11998                 abm->msg.ch.chunk_flags = 0;
11999         }
12000         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
12001
12002         if (err_cause) {
12003                 struct mbuf *m_tmp = err_cause;
12004                 int err_len = 0;
12005
12006                 /* get length of the err_cause chain */
12007                 while (m_tmp != NULL) {
12008                         err_len += SCTP_BUF_LEN(m_tmp);
12009                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12010                 }
12011                 len = SCTP_BUF_LEN(mout) + err_len;
12012                 if (err_len % 4) {
12013                         /* need pad at end of chunk */
12014                         uint32_t cpthis = 0;
12015                         int padlen;
12016
12017                         padlen = 4 - (len % 4);
12018                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12019                         len += padlen;
12020                 }
12021                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
12022         } else {
12023                 len = SCTP_BUF_LEN(mout);
12024                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
12025         }
12026
12027         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12028                 /* no mbuf's */
12029                 sctp_m_freem(mout);
12030                 return;
12031         }
12032 #ifdef INET
12033         if (iph_out != NULL) {
12034                 sctp_route_t ro;
12035                 int ret;
12036
12037                 /* zap the stack pointer to the route */
12038                 bzero(&ro, sizeof ro);
12039                 if (port) {
12040                         udp->uh_ulen = htons(len - sizeof(struct ip));
12041                         if (V_udp_cksum) {
12042                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12043                         } else {
12044                                 udp->uh_sum = 0;
12045                         }
12046                 }
12047                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
12048                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
12049                 /* set IPv4 length */
12050                 iph_out->ip_len = len;
12051                 /* out it goes */
12052 #ifdef  SCTP_PACKET_LOGGING
12053                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12054                         sctp_packet_log(mout, len);
12055 #endif
12056                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12057                 if (port) {
12058 #if defined(SCTP_WITH_NO_CSUM)
12059                         SCTP_STAT_INCR(sctps_sendnocrc);
12060 #else
12061                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
12062                         SCTP_STAT_INCR(sctps_sendswcrc);
12063 #endif
12064                         if (V_udp_cksum) {
12065                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12066                         }
12067                 } else {
12068 #if defined(SCTP_WITH_NO_CSUM)
12069                         SCTP_STAT_INCR(sctps_sendnocrc);
12070 #else
12071                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12072                         mout->m_pkthdr.csum_data = 0;
12073                         SCTP_STAT_INCR(sctps_sendhwcrc);
12074 #endif
12075                 }
12076                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12077
12078                 /* Free the route if we got one back */
12079                 if (ro.ro_rt)
12080                         RTFREE(ro.ro_rt);
12081         }
12082 #endif
12083 #ifdef INET6
12084         if (ip6_out != NULL) {
12085                 struct route_in6 ro;
12086                 int ret;
12087                 struct ifnet *ifp = NULL;
12088
12089                 /* zap the stack pointer to the route */
12090                 bzero(&ro, sizeof(ro));
12091                 if (port) {
12092                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12093                 }
12094                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
12095                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
12096                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12097 #ifdef  SCTP_PACKET_LOGGING
12098                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12099                         sctp_packet_log(mout, len);
12100 #endif
12101                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12102                 if (port) {
12103 #if defined(SCTP_WITH_NO_CSUM)
12104                         SCTP_STAT_INCR(sctps_sendnocrc);
12105 #else
12106                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12107                         SCTP_STAT_INCR(sctps_sendswcrc);
12108 #endif
12109                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12110                                 udp->uh_sum = 0xffff;
12111                         }
12112                 } else {
12113 #if defined(SCTP_WITH_NO_CSUM)
12114                         SCTP_STAT_INCR(sctps_sendnocrc);
12115 #else
12116                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12117                         mout->m_pkthdr.csum_data = 0;
12118                         SCTP_STAT_INCR(sctps_sendhwcrc);
12119 #endif
12120                 }
12121                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12122
12123                 /* Free the route if we got one back */
12124                 if (ro.ro_rt)
12125                         RTFREE(ro.ro_rt);
12126         }
12127 #endif
12128         SCTP_STAT_INCR(sctps_sendpackets);
12129         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12130         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12131 }
12132
12133 void
12134 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12135     uint32_t vrf_id, uint16_t port)
12136 {
12137         struct mbuf *o_pak;
12138         struct sctphdr *sh, *sh_out;
12139         struct sctp_chunkhdr *ch;
12140         struct ip *iph;
12141         struct udphdr *udp = NULL;
12142         struct mbuf *mout;
12143         int iphlen_out, len;
12144
12145 #ifdef INET
12146         struct ip *iph_out;
12147
12148 #endif
12149 #ifdef INET6
12150         struct ip6_hdr *ip6, *ip6_out;
12151
12152 #endif
12153
12154         iph = mtod(m, struct ip *);
12155         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12156         switch (iph->ip_v) {
12157 #ifdef INET
12158         case IPVERSION:
12159                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12160                 break;
12161 #endif
12162 #ifdef INET6
12163         case IPV6_VERSION >> 4:
12164                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12165                 break;
12166 #endif
12167         default:
12168                 if (scm) {
12169                         sctp_m_freem(scm);
12170                 }
12171                 return;
12172         }
12173         if (port) {
12174                 len += sizeof(struct udphdr);
12175         }
12176         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12177         if (mout == NULL) {
12178                 if (scm) {
12179                         sctp_m_freem(scm);
12180                 }
12181                 return;
12182         }
12183         SCTP_BUF_RESV_UF(mout, max_linkhdr);
12184         SCTP_BUF_LEN(mout) = len;
12185         SCTP_BUF_NEXT(mout) = scm;
12186         if (m->m_flags & M_FLOWID) {
12187                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12188                 mout->m_flags |= M_FLOWID;
12189         }
12190 #ifdef INET
12191         iph_out = NULL;
12192 #endif
12193 #ifdef INET6
12194         ip6_out = NULL;
12195 #endif
12196         switch (iph->ip_v) {
12197 #ifdef INET
12198         case IPVERSION:
12199                 iph_out = mtod(mout, struct ip *);
12200
12201                 /* Fill in the IP header for the ABORT */
12202                 iph_out->ip_v = IPVERSION;
12203                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12204                 iph_out->ip_tos = (u_char)0;
12205                 iph_out->ip_id = 0;
12206                 iph_out->ip_off = 0;
12207                 iph_out->ip_ttl = MAXTTL;
12208                 if (port) {
12209                         iph_out->ip_p = IPPROTO_UDP;
12210                 } else {
12211                         iph_out->ip_p = IPPROTO_SCTP;
12212                 }
12213                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12214                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12215                 /* let IP layer calculate this */
12216                 iph_out->ip_sum = 0;
12217
12218                 iphlen_out = sizeof(struct ip);
12219                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12220                 break;
12221 #endif
12222 #ifdef INET6
12223         case IPV6_VERSION >> 4:
12224                 ip6 = (struct ip6_hdr *)iph;
12225                 ip6_out = mtod(mout, struct ip6_hdr *);
12226
12227                 /* Fill in the IP6 header for the ABORT */
12228                 ip6_out->ip6_flow = ip6->ip6_flow;
12229                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12230                 if (port) {
12231                         ip6_out->ip6_nxt = IPPROTO_UDP;
12232                 } else {
12233                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12234                 }
12235                 ip6_out->ip6_src = ip6->ip6_dst;
12236                 ip6_out->ip6_dst = ip6->ip6_src;
12237
12238                 iphlen_out = sizeof(struct ip6_hdr);
12239                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12240                 break;
12241 #endif                          /* INET6 */
12242         default:
12243                 /* Currently not supported */
12244                 sctp_m_freem(mout);
12245                 return;
12246         }
12247
12248         udp = (struct udphdr *)sh_out;
12249         if (port) {
12250                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12251                         sctp_m_freem(mout);
12252                         return;
12253                 }
12254                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12255                 udp->uh_dport = port;
12256                 /* set udp->uh_ulen later */
12257                 udp->uh_sum = 0;
12258                 iphlen_out += sizeof(struct udphdr);
12259                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12260         }
12261         sh_out->src_port = sh->dest_port;
12262         sh_out->dest_port = sh->src_port;
12263         sh_out->v_tag = vtag;
12264         sh_out->checksum = 0;
12265
12266         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12267         ch->chunk_type = SCTP_OPERATION_ERROR;
12268         ch->chunk_flags = 0;
12269
12270         if (scm) {
12271                 struct mbuf *m_tmp = scm;
12272                 int cause_len = 0;
12273
12274                 /* get length of the err_cause chain */
12275                 while (m_tmp != NULL) {
12276                         cause_len += SCTP_BUF_LEN(m_tmp);
12277                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12278                 }
12279                 len = SCTP_BUF_LEN(mout) + cause_len;
12280                 if (cause_len % 4) {
12281                         /* need pad at end of chunk */
12282                         uint32_t cpthis = 0;
12283                         int padlen;
12284
12285                         padlen = 4 - (len % 4);
12286                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12287                         len += padlen;
12288                 }
12289                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12290         } else {
12291                 len = SCTP_BUF_LEN(mout);
12292                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12293         }
12294
12295         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12296                 /* no mbuf's */
12297                 sctp_m_freem(mout);
12298                 return;
12299         }
12300 #ifdef INET
12301         if (iph_out != NULL) {
12302                 sctp_route_t ro;
12303                 int ret;
12304
12305                 /* zap the stack pointer to the route */
12306                 bzero(&ro, sizeof ro);
12307                 if (port) {
12308                         udp->uh_ulen = htons(len - sizeof(struct ip));
12309                         if (V_udp_cksum) {
12310                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12311                         } else {
12312                                 udp->uh_sum = 0;
12313                         }
12314                 }
12315                 /* set IPv4 length */
12316                 iph_out->ip_len = len;
12317                 /* out it goes */
12318 #ifdef  SCTP_PACKET_LOGGING
12319                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12320                         sctp_packet_log(mout, len);
12321 #endif
12322                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12323                 if (port) {
12324 #if defined(SCTP_WITH_NO_CSUM)
12325                         SCTP_STAT_INCR(sctps_sendnocrc);
12326 #else
12327                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12328                         SCTP_STAT_INCR(sctps_sendswcrc);
12329 #endif
12330                         if (V_udp_cksum) {
12331                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12332                         }
12333                 } else {
12334 #if defined(SCTP_WITH_NO_CSUM)
12335                         SCTP_STAT_INCR(sctps_sendnocrc);
12336 #else
12337                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12338                         mout->m_pkthdr.csum_data = 0;
12339                         SCTP_STAT_INCR(sctps_sendhwcrc);
12340 #endif
12341                 }
12342                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12343
12344                 /* Free the route if we got one back */
12345                 if (ro.ro_rt)
12346                         RTFREE(ro.ro_rt);
12347         }
12348 #endif
12349 #ifdef INET6
12350         if (ip6_out != NULL) {
12351                 struct route_in6 ro;
12352                 int ret;
12353                 struct ifnet *ifp = NULL;
12354
12355                 /* zap the stack pointer to the route */
12356                 bzero(&ro, sizeof(ro));
12357                 if (port) {
12358                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12359                 }
12360                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12361 #ifdef  SCTP_PACKET_LOGGING
12362                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12363                         sctp_packet_log(mout, len);
12364 #endif
12365                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12366                 if (port) {
12367 #if defined(SCTP_WITH_NO_CSUM)
12368                         SCTP_STAT_INCR(sctps_sendnocrc);
12369 #else
12370                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12371                         SCTP_STAT_INCR(sctps_sendswcrc);
12372 #endif
12373                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12374                                 udp->uh_sum = 0xffff;
12375                         }
12376                 } else {
12377 #if defined(SCTP_WITH_NO_CSUM)
12378                         SCTP_STAT_INCR(sctps_sendnocrc);
12379 #else
12380                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12381                         mout->m_pkthdr.csum_data = 0;
12382                         SCTP_STAT_INCR(sctps_sendhwcrc);
12383 #endif
12384                 }
12385                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12386
12387                 /* Free the route if we got one back */
12388                 if (ro.ro_rt)
12389                         RTFREE(ro.ro_rt);
12390         }
12391 #endif
12392         SCTP_STAT_INCR(sctps_sendpackets);
12393         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12394         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12395 }
12396
12397 static struct mbuf *
12398 sctp_copy_resume(struct uio *uio,
12399     int max_send_len,
12400     int user_marks_eor,
12401     int *error,
12402     uint32_t * sndout,
12403     struct mbuf **new_tail)
12404 {
12405         struct mbuf *m;
12406
12407         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12408             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12409         if (m == NULL) {
12410                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12411                 *error = ENOMEM;
12412         } else {
12413                 *sndout = m_length(m, NULL);
12414                 *new_tail = m_last(m);
12415         }
12416         return (m);
12417 }
12418
12419 static int
12420 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12421     struct uio *uio,
12422     int resv_upfront)
12423 {
12424         int left;
12425
12426         left = sp->length;
12427         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12428             resv_upfront, 0);
12429         if (sp->data == NULL) {
12430                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12431                 return (ENOMEM);
12432         }
12433         sp->tail_mbuf = m_last(sp->data);
12434         return (0);
12435 }
12436
12437
12438
12439 static struct sctp_stream_queue_pending *
12440 sctp_copy_it_in(struct sctp_tcb *stcb,
12441     struct sctp_association *asoc,
12442     struct sctp_sndrcvinfo *srcv,
12443     struct uio *uio,
12444     struct sctp_nets *net,
12445     int max_send_len,
12446     int user_marks_eor,
12447     int *error)
12448 {
12449         /*-
12450          * This routine must be very careful in its work. Protocol
12451          * processing is up and running so care must be taken to spl...()
12452          * when you need to do something that may effect the stcb/asoc. The
12453          * sb is locked however. When data is copied the protocol processing
12454          * should be enabled since this is a slower operation...
12455          */
12456         struct sctp_stream_queue_pending *sp = NULL;
12457         int resv_in_first;
12458
12459         *error = 0;
12460         /* Now can we send this? */
12461         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12462             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12463             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12464             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12465                 /* got data while shutting down */
12466                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12467                 *error = ECONNRESET;
12468                 goto out_now;
12469         }
12470         sctp_alloc_a_strmoq(stcb, sp);
12471         if (sp == NULL) {
12472                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12473                 *error = ENOMEM;
12474                 goto out_now;
12475         }
12476         sp->act_flags = 0;
12477         sp->sender_all_done = 0;
12478         sp->sinfo_flags = srcv->sinfo_flags;
12479         sp->timetolive = srcv->sinfo_timetolive;
12480         sp->ppid = srcv->sinfo_ppid;
12481         sp->context = srcv->sinfo_context;
12482         sp->strseq = 0;
12483         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12484
12485         sp->stream = srcv->sinfo_stream;
12486         sp->length = min(uio->uio_resid, max_send_len);
12487         if ((sp->length == (uint32_t) uio->uio_resid) &&
12488             ((user_marks_eor == 0) ||
12489             (srcv->sinfo_flags & SCTP_EOF) ||
12490             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12491                 sp->msg_is_complete = 1;
12492         } else {
12493                 sp->msg_is_complete = 0;
12494         }
12495         sp->sender_all_done = 0;
12496         sp->some_taken = 0;
12497         sp->put_last_out = 0;
12498         resv_in_first = sizeof(struct sctp_data_chunk);
12499         sp->data = sp->tail_mbuf = NULL;
12500         if (sp->length == 0) {
12501                 *error = 0;
12502                 goto skip_copy;
12503         }
12504         if (srcv->sinfo_keynumber_valid) {
12505                 sp->auth_keyid = srcv->sinfo_keynumber;
12506         } else {
12507                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12508         }
12509         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12510                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12511                 sp->holds_key_ref = 1;
12512         }
12513         *error = sctp_copy_one(sp, uio, resv_in_first);
12514 skip_copy:
12515         if (*error) {
12516                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12517                 sp = NULL;
12518         } else {
12519                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12520                         sp->net = net;
12521                         atomic_add_int(&sp->net->ref_count, 1);
12522                 } else {
12523                         sp->net = NULL;
12524                 }
12525                 sctp_set_prsctp_policy(sp);
12526         }
12527 out_now:
12528         return (sp);
12529 }
12530
12531
12532 int
12533 sctp_sosend(struct socket *so,
12534     struct sockaddr *addr,
12535     struct uio *uio,
12536     struct mbuf *top,
12537     struct mbuf *control,
12538     int flags,
12539     struct thread *p
12540 )
12541 {
12542         int error, use_sndinfo = 0;
12543         struct sctp_sndrcvinfo sndrcvninfo;
12544         struct sockaddr *addr_to_use;
12545
12546 #if defined(INET) && defined(INET6)
12547         struct sockaddr_in sin;
12548
12549 #endif
12550
12551         if (control) {
12552                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12553                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12554                     sizeof(sndrcvninfo))) {
12555                         /* got one */
12556                         use_sndinfo = 1;
12557                 }
12558         }
12559         addr_to_use = addr;
12560 #if defined(INET) && defined(INET6)
12561         if ((addr) && (addr->sa_family == AF_INET6)) {
12562                 struct sockaddr_in6 *sin6;
12563
12564                 sin6 = (struct sockaddr_in6 *)addr;
12565                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12566                         in6_sin6_2_sin(&sin, sin6);
12567                         addr_to_use = (struct sockaddr *)&sin;
12568                 }
12569         }
12570 #endif
12571         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12572             control,
12573             flags,
12574             use_sndinfo ? &sndrcvninfo : NULL
12575             ,p
12576             );
12577         return (error);
12578 }
12579
12580
12581 int
12582 sctp_lower_sosend(struct socket *so,
12583     struct sockaddr *addr,
12584     struct uio *uio,
12585     struct mbuf *i_pak,
12586     struct mbuf *control,
12587     int flags,
12588     struct sctp_sndrcvinfo *srcv
12589     ,
12590     struct thread *p
12591 )
12592 {
12593         unsigned int sndlen = 0, max_len;
12594         int error, len;
12595         struct mbuf *top = NULL;
12596         int queue_only = 0, queue_only_for_init = 0;
12597         int free_cnt_applied = 0;
12598         int un_sent;
12599         int now_filled = 0;
12600         unsigned int inqueue_bytes = 0;
12601         struct sctp_block_entry be;
12602         struct sctp_inpcb *inp;
12603         struct sctp_tcb *stcb = NULL;
12604         struct timeval now;
12605         struct sctp_nets *net;
12606         struct sctp_association *asoc;
12607         struct sctp_inpcb *t_inp;
12608         int user_marks_eor;
12609         int create_lock_applied = 0;
12610         int nagle_applies = 0;
12611         int some_on_control = 0;
12612         int got_all_of_the_send = 0;
12613         int hold_tcblock = 0;
12614         int non_blocking = 0;
12615         uint32_t local_add_more, local_soresv = 0;
12616         uint16_t port;
12617         uint16_t sinfo_flags;
12618         sctp_assoc_t sinfo_assoc_id;
12619
12620         error = 0;
12621         net = NULL;
12622         stcb = NULL;
12623         asoc = NULL;
12624
12625         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12626         if (inp == NULL) {
12627                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12628                 error = EINVAL;
12629                 if (i_pak) {
12630                         SCTP_RELEASE_PKT(i_pak);
12631                 }
12632                 return (error);
12633         }
12634         if ((uio == NULL) && (i_pak == NULL)) {
12635                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12636                 return (EINVAL);
12637         }
12638         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12639         atomic_add_int(&inp->total_sends, 1);
12640         if (uio) {
12641                 if (uio->uio_resid < 0) {
12642                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12643                         return (EINVAL);
12644                 }
12645                 sndlen = uio->uio_resid;
12646         } else {
12647                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12648                 sndlen = SCTP_HEADER_LEN(i_pak);
12649         }
12650         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12651             addr,
12652             sndlen);
12653         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12654             (inp->sctp_socket->so_qlimit)) {
12655                 /* The listener can NOT send */
12656                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12657                 error = ENOTCONN;
12658                 goto out_unlocked;
12659         }
12660         /**
12661          * Pre-screen address, if one is given the sin-len
12662          * must be set correctly!
12663          */
12664         if (addr) {
12665                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12666
12667                 switch (raddr->sa.sa_family) {
12668 #if defined(INET)
12669                 case AF_INET:
12670                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12671                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12672                                 error = EINVAL;
12673                                 goto out_unlocked;
12674                         }
12675                         port = raddr->sin.sin_port;
12676                         break;
12677 #endif
12678 #if defined(INET6)
12679                 case AF_INET6:
12680                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12681                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12682                                 error = EINVAL;
12683                                 goto out_unlocked;
12684                         }
12685                         port = raddr->sin6.sin6_port;
12686                         break;
12687 #endif
12688                 default:
12689                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12690                         error = EAFNOSUPPORT;
12691                         goto out_unlocked;
12692                 }
12693         } else
12694                 port = 0;
12695
12696         if (srcv) {
12697                 sinfo_flags = srcv->sinfo_flags;
12698                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12699                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12700                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12701                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12702                         error = EINVAL;
12703                         goto out_unlocked;
12704                 }
12705                 if (srcv->sinfo_flags)
12706                         SCTP_STAT_INCR(sctps_sends_with_flags);
12707         } else {
12708                 sinfo_flags = inp->def_send.sinfo_flags;
12709                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12710         }
12711         if (sinfo_flags & SCTP_SENDALL) {
12712                 /* its a sendall */
12713                 error = sctp_sendall(inp, uio, top, srcv);
12714                 top = NULL;
12715                 goto out_unlocked;
12716         }
12717         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12718                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12719                 error = EINVAL;
12720                 goto out_unlocked;
12721         }
12722         /* now we must find the assoc */
12723         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12724             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12725                 SCTP_INP_RLOCK(inp);
12726                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12727                 if (stcb) {
12728                         SCTP_TCB_LOCK(stcb);
12729                         hold_tcblock = 1;
12730                 }
12731                 SCTP_INP_RUNLOCK(inp);
12732         } else if (sinfo_assoc_id) {
12733                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12734         } else if (addr) {
12735                 /*-
12736                  * Since we did not use findep we must
12737                  * increment it, and if we don't find a tcb
12738                  * decrement it.
12739                  */
12740                 SCTP_INP_WLOCK(inp);
12741                 SCTP_INP_INCR_REF(inp);
12742                 SCTP_INP_WUNLOCK(inp);
12743                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12744                 if (stcb == NULL) {
12745                         SCTP_INP_WLOCK(inp);
12746                         SCTP_INP_DECR_REF(inp);
12747                         SCTP_INP_WUNLOCK(inp);
12748                 } else {
12749                         hold_tcblock = 1;
12750                 }
12751         }
12752         if ((stcb == NULL) && (addr)) {
12753                 /* Possible implicit send? */
12754                 SCTP_ASOC_CREATE_LOCK(inp);
12755                 create_lock_applied = 1;
12756                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12757                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12758                         /* Should I really unlock ? */
12759                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12760                         error = EINVAL;
12761                         goto out_unlocked;
12762
12763                 }
12764                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12765                     (addr->sa_family == AF_INET6)) {
12766                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12767                         error = EINVAL;
12768                         goto out_unlocked;
12769                 }
12770                 SCTP_INP_WLOCK(inp);
12771                 SCTP_INP_INCR_REF(inp);
12772                 SCTP_INP_WUNLOCK(inp);
12773                 /* With the lock applied look again */
12774                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12775                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12776                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12777                 }
12778                 if (stcb == NULL) {
12779                         SCTP_INP_WLOCK(inp);
12780                         SCTP_INP_DECR_REF(inp);
12781                         SCTP_INP_WUNLOCK(inp);
12782                 } else {
12783                         hold_tcblock = 1;
12784                 }
12785                 if (error) {
12786                         goto out_unlocked;
12787                 }
12788                 if (t_inp != inp) {
12789                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12790                         error = ENOTCONN;
12791                         goto out_unlocked;
12792                 }
12793         }
12794         if (stcb == NULL) {
12795                 if (addr == NULL) {
12796                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12797                         error = ENOENT;
12798                         goto out_unlocked;
12799                 } else {
12800                         /* We must go ahead and start the INIT process */
12801                         uint32_t vrf_id;
12802
12803                         if ((sinfo_flags & SCTP_ABORT) ||
12804                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12805                                 /*-
12806                                  * User asks to abort a non-existant assoc,
12807                                  * or EOF a non-existant assoc with no data
12808                                  */
12809                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12810                                 error = ENOENT;
12811                                 goto out_unlocked;
12812                         }
12813                         /* get an asoc/stcb struct */
12814                         vrf_id = inp->def_vrf_id;
12815 #ifdef INVARIANTS
12816                         if (create_lock_applied == 0) {
12817                                 panic("Error, should hold create lock and I don't?");
12818                         }
12819 #endif
12820                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12821                             p
12822                             );
12823                         if (stcb == NULL) {
12824                                 /* Error is setup for us in the call */
12825                                 goto out_unlocked;
12826                         }
12827                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12828                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12829                                 /*
12830                                  * Set the connected flag so we can queue
12831                                  * data
12832                                  */
12833                                 soisconnecting(so);
12834                         }
12835                         hold_tcblock = 1;
12836                         if (create_lock_applied) {
12837                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12838                                 create_lock_applied = 0;
12839                         } else {
12840                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12841                         }
12842                         /*
12843                          * Turn on queue only flag to prevent data from
12844                          * being sent
12845                          */
12846                         queue_only = 1;
12847                         asoc = &stcb->asoc;
12848                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12849                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12850
12851                         /* initialize authentication params for the assoc */
12852                         sctp_initialize_auth_params(inp, stcb);
12853
12854                         if (control) {
12855                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12856                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12857                                         hold_tcblock = 0;
12858                                         stcb = NULL;
12859                                         goto out_unlocked;
12860                                 }
12861                         }
12862                         /* out with the INIT */
12863                         queue_only_for_init = 1;
12864                         /*-
12865                          * we may want to dig in after this call and adjust the MTU
12866                          * value. It defaulted to 1500 (constant) but the ro
12867                          * structure may now have an update and thus we may need to
12868                          * change it BEFORE we append the message.
12869                          */
12870                 }
12871         } else
12872                 asoc = &stcb->asoc;
12873         if (srcv == NULL)
12874                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12875         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12876                 if (addr)
12877                         net = sctp_findnet(stcb, addr);
12878                 else
12879                         net = NULL;
12880                 if ((net == NULL) ||
12881                     ((port != 0) && (port != stcb->rport))) {
12882                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12883                         error = EINVAL;
12884                         goto out_unlocked;
12885                 }
12886         } else {
12887                 if (stcb->asoc.alternate) {
12888                         net = stcb->asoc.alternate;
12889                 } else {
12890                         net = stcb->asoc.primary_destination;
12891                 }
12892         }
12893         atomic_add_int(&stcb->total_sends, 1);
12894         /* Keep the stcb from being freed under our feet */
12895         atomic_add_int(&asoc->refcnt, 1);
12896         free_cnt_applied = 1;
12897
12898         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12899                 if (sndlen > asoc->smallest_mtu) {
12900                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12901                         error = EMSGSIZE;
12902                         goto out_unlocked;
12903                 }
12904         }
12905         if (SCTP_SO_IS_NBIO(so)
12906             || (flags & MSG_NBIO)
12907             ) {
12908                 non_blocking = 1;
12909         }
12910         /* would we block? */
12911         if (non_blocking) {
12912                 if (hold_tcblock == 0) {
12913                         SCTP_TCB_LOCK(stcb);
12914                         hold_tcblock = 1;
12915                 }
12916                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12917                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12918                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12919                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12920                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12921                                 error = EMSGSIZE;
12922                         else
12923                                 error = EWOULDBLOCK;
12924                         goto out_unlocked;
12925                 }
12926                 stcb->asoc.sb_send_resv += sndlen;
12927                 SCTP_TCB_UNLOCK(stcb);
12928                 hold_tcblock = 0;
12929         } else {
12930                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12931         }
12932         local_soresv = sndlen;
12933         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12934                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12935                 error = ECONNRESET;
12936                 goto out_unlocked;
12937         }
12938         if (create_lock_applied) {
12939                 SCTP_ASOC_CREATE_UNLOCK(inp);
12940                 create_lock_applied = 0;
12941         }
12942         if (asoc->stream_reset_outstanding) {
12943                 /*
12944                  * Can't queue any data while stream reset is underway.
12945                  */
12946                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12947                 error = EAGAIN;
12948                 goto out_unlocked;
12949         }
12950         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12951             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12952                 queue_only = 1;
12953         }
12954         /* we are now done with all control */
12955         if (control) {
12956                 sctp_m_freem(control);
12957                 control = NULL;
12958         }
12959         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12960             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12961             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12962             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12963                 if (srcv->sinfo_flags & SCTP_ABORT) {
12964                         ;
12965                 } else {
12966                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12967                         error = ECONNRESET;
12968                         goto out_unlocked;
12969                 }
12970         }
12971         /* Ok, we will attempt a msgsnd :> */
12972         if (p) {
12973                 p->td_ru.ru_msgsnd++;
12974         }
12975         /* Are we aborting? */
12976         if (srcv->sinfo_flags & SCTP_ABORT) {
12977                 struct mbuf *mm;
12978                 int tot_demand, tot_out = 0, max_out;
12979
12980                 SCTP_STAT_INCR(sctps_sends_with_abort);
12981                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12982                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12983                         /* It has to be up before we abort */
12984                         /* how big is the user initiated abort? */
12985                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12986                         error = EINVAL;
12987                         goto out;
12988                 }
12989                 if (hold_tcblock) {
12990                         SCTP_TCB_UNLOCK(stcb);
12991                         hold_tcblock = 0;
12992                 }
12993                 if (top) {
12994                         struct mbuf *cntm = NULL;
12995
12996                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12997                         if (sndlen != 0) {
12998                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12999                                         tot_out += SCTP_BUF_LEN(cntm);
13000                                 }
13001                         }
13002                 } else {
13003                         /* Must fit in a MTU */
13004                         tot_out = sndlen;
13005                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13006                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13007                                 /* To big */
13008                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13009                                 error = EMSGSIZE;
13010                                 goto out;
13011                         }
13012                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
13013                 }
13014                 if (mm == NULL) {
13015                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13016                         error = ENOMEM;
13017                         goto out;
13018                 }
13019                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13020                 max_out -= sizeof(struct sctp_abort_msg);
13021                 if (tot_out > max_out) {
13022                         tot_out = max_out;
13023                 }
13024                 if (mm) {
13025                         struct sctp_paramhdr *ph;
13026
13027                         /* now move forward the data pointer */
13028                         ph = mtod(mm, struct sctp_paramhdr *);
13029                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13030                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
13031                         ph++;
13032                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13033                         if (top == NULL) {
13034                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13035                                 if (error) {
13036                                         /*-
13037                                          * Here if we can't get his data we
13038                                          * still abort we just don't get to
13039                                          * send the users note :-0
13040                                          */
13041                                         sctp_m_freem(mm);
13042                                         mm = NULL;
13043                                 }
13044                         } else {
13045                                 if (sndlen != 0) {
13046                                         SCTP_BUF_NEXT(mm) = top;
13047                                 }
13048                         }
13049                 }
13050                 if (hold_tcblock == 0) {
13051                         SCTP_TCB_LOCK(stcb);
13052                 }
13053                 atomic_add_int(&stcb->asoc.refcnt, -1);
13054                 free_cnt_applied = 0;
13055                 /* release this lock, otherwise we hang on ourselves */
13056                 sctp_abort_an_association(stcb->sctp_ep, stcb,
13057                     SCTP_RESPONSE_TO_USER_REQ,
13058                     mm, SCTP_SO_LOCKED);
13059                 /* now relock the stcb so everything is sane */
13060                 hold_tcblock = 0;
13061                 stcb = NULL;
13062                 /*
13063                  * In this case top is already chained to mm avoid double
13064                  * free, since we free it below if top != NULL and driver
13065                  * would free it after sending the packet out
13066                  */
13067                 if (sndlen != 0) {
13068                         top = NULL;
13069                 }
13070                 goto out_unlocked;
13071         }
13072         /* Calculate the maximum we can send */
13073         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13074         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13075                 if (non_blocking) {
13076                         /* we already checked for non-blocking above. */
13077                         max_len = sndlen;
13078                 } else {
13079                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13080                 }
13081         } else {
13082                 max_len = 0;
13083         }
13084         if (hold_tcblock) {
13085                 SCTP_TCB_UNLOCK(stcb);
13086                 hold_tcblock = 0;
13087         }
13088         /* Is the stream no. valid? */
13089         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
13090                 /* Invalid stream number */
13091                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13092                 error = EINVAL;
13093                 goto out_unlocked;
13094         }
13095         if (asoc->strmout == NULL) {
13096                 /* huh? software error */
13097                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13098                 error = EFAULT;
13099                 goto out_unlocked;
13100         }
13101         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13102         if ((user_marks_eor == 0) &&
13103             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13104                 /* It will NEVER fit */
13105                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13106                 error = EMSGSIZE;
13107                 goto out_unlocked;
13108         }
13109         if ((uio == NULL) && user_marks_eor) {
13110                 /*-
13111                  * We do not support eeor mode for
13112                  * sending with mbuf chains (like sendfile).
13113                  */
13114                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13115                 error = EINVAL;
13116                 goto out_unlocked;
13117         }
13118         if (user_marks_eor) {
13119                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13120         } else {
13121                 /*-
13122                  * For non-eeor the whole message must fit in
13123                  * the socket send buffer.
13124                  */
13125                 local_add_more = sndlen;
13126         }
13127         len = 0;
13128         if (non_blocking) {
13129                 goto skip_preblock;
13130         }
13131         if (((max_len <= local_add_more) &&
13132             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13133             (max_len == 0) ||
13134             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13135                 /* No room right now ! */
13136                 SOCKBUF_LOCK(&so->so_snd);
13137                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13138                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13139                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13140                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13141                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13142                             inqueue_bytes,
13143                             local_add_more,
13144                             stcb->asoc.stream_queue_cnt,
13145                             stcb->asoc.chunks_on_out_queue,
13146                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13147                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13148                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13149                         }
13150                         be.error = 0;
13151                         stcb->block_entry = &be;
13152                         error = sbwait(&so->so_snd);
13153                         stcb->block_entry = NULL;
13154                         if (error || so->so_error || be.error) {
13155                                 if (error == 0) {
13156                                         if (so->so_error)
13157                                                 error = so->so_error;
13158                                         if (be.error) {
13159                                                 error = be.error;
13160                                         }
13161                                 }
13162                                 SOCKBUF_UNLOCK(&so->so_snd);
13163                                 goto out_unlocked;
13164                         }
13165                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13166                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13167                                     asoc, stcb->asoc.total_output_queue_size);
13168                         }
13169                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13170                                 goto out_unlocked;
13171                         }
13172                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13173                 }
13174                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13175                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13176                 } else {
13177                         max_len = 0;
13178                 }
13179                 SOCKBUF_UNLOCK(&so->so_snd);
13180         }
13181 skip_preblock:
13182         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13183                 goto out_unlocked;
13184         }
13185         /*
13186          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13187          * case NOTE: uio will be null when top/mbuf is passed
13188          */
13189         if (sndlen == 0) {
13190                 if (srcv->sinfo_flags & SCTP_EOF) {
13191                         got_all_of_the_send = 1;
13192                         goto dataless_eof;
13193                 } else {
13194                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13195                         error = EINVAL;
13196                         goto out;
13197                 }
13198         }
13199         if (top == NULL) {
13200                 struct sctp_stream_queue_pending *sp;
13201                 struct sctp_stream_out *strm;
13202                 uint32_t sndout;
13203
13204                 SCTP_TCB_SEND_LOCK(stcb);
13205                 if ((asoc->stream_locked) &&
13206                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13207                         SCTP_TCB_SEND_UNLOCK(stcb);
13208                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13209                         error = EINVAL;
13210                         goto out;
13211                 }
13212                 SCTP_TCB_SEND_UNLOCK(stcb);
13213
13214                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13215                 if (strm->last_msg_incomplete == 0) {
13216         do_a_copy_in:
13217                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13218                         if ((sp == NULL) || (error)) {
13219                                 goto out;
13220                         }
13221                         SCTP_TCB_SEND_LOCK(stcb);
13222                         if (sp->msg_is_complete) {
13223                                 strm->last_msg_incomplete = 0;
13224                                 asoc->stream_locked = 0;
13225                         } else {
13226                                 /*
13227                                  * Just got locked to this guy in case of an
13228                                  * interrupt.
13229                                  */
13230                                 strm->last_msg_incomplete = 1;
13231                                 asoc->stream_locked = 1;
13232                                 asoc->stream_locked_on = srcv->sinfo_stream;
13233                                 sp->sender_all_done = 0;
13234                         }
13235                         sctp_snd_sb_alloc(stcb, sp->length);
13236                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13237                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13238                                 sp->strseq = strm->next_sequence_sent;
13239                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13240                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13241                                             (uintptr_t) stcb, sp->length,
13242                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13243                                 }
13244                                 strm->next_sequence_sent++;
13245                         } else {
13246                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13247                         }
13248                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13249                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13250                         SCTP_TCB_SEND_UNLOCK(stcb);
13251                 } else {
13252                         SCTP_TCB_SEND_LOCK(stcb);
13253                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13254                         SCTP_TCB_SEND_UNLOCK(stcb);
13255                         if (sp == NULL) {
13256                                 /* ???? Huh ??? last msg is gone */
13257 #ifdef INVARIANTS
13258                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13259 #else
13260                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13261                                 strm->last_msg_incomplete = 0;
13262 #endif
13263                                 goto do_a_copy_in;
13264
13265                         }
13266                 }
13267                 while (uio->uio_resid > 0) {
13268                         /* How much room do we have? */
13269                         struct mbuf *new_tail, *mm;
13270
13271                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13272                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13273                         else
13274                                 max_len = 0;
13275
13276                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13277                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13278                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13279                                 sndout = 0;
13280                                 new_tail = NULL;
13281                                 if (hold_tcblock) {
13282                                         SCTP_TCB_UNLOCK(stcb);
13283                                         hold_tcblock = 0;
13284                                 }
13285                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13286                                 if ((mm == NULL) || error) {
13287                                         if (mm) {
13288                                                 sctp_m_freem(mm);
13289                                         }
13290                                         goto out;
13291                                 }
13292                                 /* Update the mbuf and count */
13293                                 SCTP_TCB_SEND_LOCK(stcb);
13294                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13295                                         /*
13296                                          * we need to get out. Peer probably
13297                                          * aborted.
13298                                          */
13299                                         sctp_m_freem(mm);
13300                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13301                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13302                                                 error = ECONNRESET;
13303                                         }
13304                                         SCTP_TCB_SEND_UNLOCK(stcb);
13305                                         goto out;
13306                                 }
13307                                 if (sp->tail_mbuf) {
13308                                         /* tack it to the end */
13309                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13310                                         sp->tail_mbuf = new_tail;
13311                                 } else {
13312                                         /* A stolen mbuf */
13313                                         sp->data = mm;
13314                                         sp->tail_mbuf = new_tail;
13315                                 }
13316                                 sctp_snd_sb_alloc(stcb, sndout);
13317                                 atomic_add_int(&sp->length, sndout);
13318                                 len += sndout;
13319
13320                                 /* Did we reach EOR? */
13321                                 if ((uio->uio_resid == 0) &&
13322                                     ((user_marks_eor == 0) ||
13323                                     (srcv->sinfo_flags & SCTP_EOF) ||
13324                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13325                                         sp->msg_is_complete = 1;
13326                                 } else {
13327                                         sp->msg_is_complete = 0;
13328                                 }
13329                                 SCTP_TCB_SEND_UNLOCK(stcb);
13330                         }
13331                         if (uio->uio_resid == 0) {
13332                                 /* got it all? */
13333                                 continue;
13334                         }
13335                         /* PR-SCTP? */
13336                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13337                                 /*
13338                                  * This is ugly but we must assure locking
13339                                  * order
13340                                  */
13341                                 if (hold_tcblock == 0) {
13342                                         SCTP_TCB_LOCK(stcb);
13343                                         hold_tcblock = 1;
13344                                 }
13345                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13346                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13347                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13348                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13349                                 else
13350                                         max_len = 0;
13351                                 if (max_len > 0) {
13352                                         continue;
13353                                 }
13354                                 SCTP_TCB_UNLOCK(stcb);
13355                                 hold_tcblock = 0;
13356                         }
13357                         /* wait for space now */
13358                         if (non_blocking) {
13359                                 /* Non-blocking io in place out */
13360                                 goto skip_out_eof;
13361                         }
13362                         /* What about the INIT, send it maybe */
13363                         if (queue_only_for_init) {
13364                                 if (hold_tcblock == 0) {
13365                                         SCTP_TCB_LOCK(stcb);
13366                                         hold_tcblock = 1;
13367                                 }
13368                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13369                                         /* a collision took us forward? */
13370                                         queue_only = 0;
13371                                 } else {
13372                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13373                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13374                                         queue_only = 1;
13375                                 }
13376                         }
13377                         if ((net->flight_size > net->cwnd) &&
13378                             (asoc->sctp_cmt_on_off == 0)) {
13379                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13380                                 queue_only = 1;
13381                         } else if (asoc->ifp_had_enobuf) {
13382                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13383                                 if (net->flight_size > (2 * net->mtu)) {
13384                                         queue_only = 1;
13385                                 }
13386                                 asoc->ifp_had_enobuf = 0;
13387                         }
13388                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13389                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13390                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13391                             (stcb->asoc.total_flight > 0) &&
13392                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13393                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13394
13395                                 /*-
13396                                  * Ok, Nagle is set on and we have data outstanding.
13397                                  * Don't send anything and let SACKs drive out the
13398                                  * data unless wen have a "full" segment to send.
13399                                  */
13400                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13401                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13402                                 }
13403                                 SCTP_STAT_INCR(sctps_naglequeued);
13404                                 nagle_applies = 1;
13405                         } else {
13406                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13407                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13408                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13409                                 }
13410                                 SCTP_STAT_INCR(sctps_naglesent);
13411                                 nagle_applies = 0;
13412                         }
13413                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13414
13415                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13416                                     nagle_applies, un_sent);
13417                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13418                                     stcb->asoc.total_flight,
13419                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13420                         }
13421                         if (queue_only_for_init)
13422                                 queue_only_for_init = 0;
13423                         if ((queue_only == 0) && (nagle_applies == 0)) {
13424                                 /*-
13425                                  * need to start chunk output
13426                                  * before blocking.. note that if
13427                                  * a lock is already applied, then
13428                                  * the input via the net is happening
13429                                  * and I don't need to start output :-D
13430                                  */
13431                                 if (hold_tcblock == 0) {
13432                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13433                                                 hold_tcblock = 1;
13434                                                 sctp_chunk_output(inp,
13435                                                     stcb,
13436                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13437                                         }
13438                                 } else {
13439                                         sctp_chunk_output(inp,
13440                                             stcb,
13441                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13442                                 }
13443                                 if (hold_tcblock == 1) {
13444                                         SCTP_TCB_UNLOCK(stcb);
13445                                         hold_tcblock = 0;
13446                                 }
13447                         }
13448                         SOCKBUF_LOCK(&so->so_snd);
13449                         /*-
13450                          * This is a bit strange, but I think it will
13451                          * work. The total_output_queue_size is locked and
13452                          * protected by the TCB_LOCK, which we just released.
13453                          * There is a race that can occur between releasing it
13454                          * above, and me getting the socket lock, where sacks
13455                          * come in but we have not put the SB_WAIT on the
13456                          * so_snd buffer to get the wakeup. After the LOCK
13457                          * is applied the sack_processing will also need to
13458                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13459                          * once we have the socket buffer lock if we recheck the
13460                          * size we KNOW we will get to sleep safely with the
13461                          * wakeup flag in place.
13462                          */
13463                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13464                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13465                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13466                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13467                                             asoc, uio->uio_resid);
13468                                 }
13469                                 be.error = 0;
13470                                 stcb->block_entry = &be;
13471                                 error = sbwait(&so->so_snd);
13472                                 stcb->block_entry = NULL;
13473
13474                                 if (error || so->so_error || be.error) {
13475                                         if (error == 0) {
13476                                                 if (so->so_error)
13477                                                         error = so->so_error;
13478                                                 if (be.error) {
13479                                                         error = be.error;
13480                                                 }
13481                                         }
13482                                         SOCKBUF_UNLOCK(&so->so_snd);
13483                                         goto out_unlocked;
13484                                 }
13485                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13486                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13487                                             asoc, stcb->asoc.total_output_queue_size);
13488                                 }
13489                         }
13490                         SOCKBUF_UNLOCK(&so->so_snd);
13491                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13492                                 goto out_unlocked;
13493                         }
13494                 }
13495                 SCTP_TCB_SEND_LOCK(stcb);
13496                 if (sp) {
13497                         if (sp->msg_is_complete == 0) {
13498                                 strm->last_msg_incomplete = 1;
13499                                 asoc->stream_locked = 1;
13500                                 asoc->stream_locked_on = srcv->sinfo_stream;
13501                         } else {
13502                                 sp->sender_all_done = 1;
13503                                 strm->last_msg_incomplete = 0;
13504                                 asoc->stream_locked = 0;
13505                         }
13506                 } else {
13507                         SCTP_PRINTF("Huh no sp TSNH?\n");
13508                         strm->last_msg_incomplete = 0;
13509                         asoc->stream_locked = 0;
13510                 }
13511                 SCTP_TCB_SEND_UNLOCK(stcb);
13512                 if (uio->uio_resid == 0) {
13513                         got_all_of_the_send = 1;
13514                 }
13515         } else {
13516                 /* We send in a 0, since we do NOT have any locks */
13517                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13518                 top = NULL;
13519                 if (srcv->sinfo_flags & SCTP_EOF) {
13520                         /*
13521                          * This should only happen for Panda for the mbuf
13522                          * send case, which does NOT yet support EEOR mode.
13523                          * Thus, we can just set this flag to do the proper
13524                          * EOF handling.
13525                          */
13526                         got_all_of_the_send = 1;
13527                 }
13528         }
13529         if (error) {
13530                 goto out;
13531         }
13532 dataless_eof:
13533         /* EOF thing ? */
13534         if ((srcv->sinfo_flags & SCTP_EOF) &&
13535             (got_all_of_the_send == 1) &&
13536             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13537                 int cnt;
13538
13539                 SCTP_STAT_INCR(sctps_sends_with_eof);
13540                 error = 0;
13541                 if (hold_tcblock == 0) {
13542                         SCTP_TCB_LOCK(stcb);
13543                         hold_tcblock = 1;
13544                 }
13545                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13546                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13547                     TAILQ_EMPTY(&asoc->sent_queue) &&
13548                     (cnt == 0)) {
13549                         if (asoc->locked_on_sending) {
13550                                 goto abort_anyway;
13551                         }
13552                         /* there is nothing queued to send, so I'm done... */
13553                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13554                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13555                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13556                                 struct sctp_nets *netp;
13557
13558                                 if (stcb->asoc.alternate) {
13559                                         netp = stcb->asoc.alternate;
13560                                 } else {
13561                                         netp = stcb->asoc.primary_destination;
13562                                 }
13563                                 /* only send SHUTDOWN the first time through */
13564                                 sctp_send_shutdown(stcb, netp);
13565                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13566                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13567                                 }
13568                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13569                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13570                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13571                                     netp);
13572                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13573                                     asoc->primary_destination);
13574                         }
13575                 } else {
13576                         /*-
13577                          * we still got (or just got) data to send, so set
13578                          * SHUTDOWN_PENDING
13579                          */
13580                         /*-
13581                          * XXX sockets draft says that SCTP_EOF should be
13582                          * sent with no data.  currently, we will allow user
13583                          * data to be sent first and move to
13584                          * SHUTDOWN-PENDING
13585                          */
13586                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13587                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13588                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13589                                 if (hold_tcblock == 0) {
13590                                         SCTP_TCB_LOCK(stcb);
13591                                         hold_tcblock = 1;
13592                                 }
13593                                 if (asoc->locked_on_sending) {
13594                                         /* Locked to send out the data */
13595                                         struct sctp_stream_queue_pending *sp;
13596
13597                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13598                                         if (sp) {
13599                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13600                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13601                                         }
13602                                 }
13603                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13604                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13605                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13606                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13607                         abort_anyway:
13608                                         if (free_cnt_applied) {
13609                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13610                                                 free_cnt_applied = 0;
13611                                         }
13612                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13613                                             SCTP_RESPONSE_TO_USER_REQ,
13614                                             NULL, SCTP_SO_LOCKED);
13615                                         /*
13616                                          * now relock the stcb so everything
13617                                          * is sane
13618                                          */
13619                                         hold_tcblock = 0;
13620                                         stcb = NULL;
13621                                         goto out;
13622                                 }
13623                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13624                                     asoc->primary_destination);
13625                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13626                         }
13627                 }
13628         }
13629 skip_out_eof:
13630         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13631                 some_on_control = 1;
13632         }
13633         if (queue_only_for_init) {
13634                 if (hold_tcblock == 0) {
13635                         SCTP_TCB_LOCK(stcb);
13636                         hold_tcblock = 1;
13637                 }
13638                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13639                         /* a collision took us forward? */
13640                         queue_only = 0;
13641                 } else {
13642                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13643                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13644                         queue_only = 1;
13645                 }
13646         }
13647         if ((net->flight_size > net->cwnd) &&
13648             (stcb->asoc.sctp_cmt_on_off == 0)) {
13649                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13650                 queue_only = 1;
13651         } else if (asoc->ifp_had_enobuf) {
13652                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13653                 if (net->flight_size > (2 * net->mtu)) {
13654                         queue_only = 1;
13655                 }
13656                 asoc->ifp_had_enobuf = 0;
13657         }
13658         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13659             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13660         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13661             (stcb->asoc.total_flight > 0) &&
13662             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13663             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13664                 /*-
13665                  * Ok, Nagle is set on and we have data outstanding.
13666                  * Don't send anything and let SACKs drive out the
13667                  * data unless wen have a "full" segment to send.
13668                  */
13669                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13670                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13671                 }
13672                 SCTP_STAT_INCR(sctps_naglequeued);
13673                 nagle_applies = 1;
13674         } else {
13675                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13676                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13677                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13678                 }
13679                 SCTP_STAT_INCR(sctps_naglesent);
13680                 nagle_applies = 0;
13681         }
13682         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13683                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13684                     nagle_applies, un_sent);
13685                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13686                     stcb->asoc.total_flight,
13687                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13688         }
13689         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13690                 /* we can attempt to send too. */
13691                 if (hold_tcblock == 0) {
13692                         /*
13693                          * If there is activity recv'ing sacks no need to
13694                          * send
13695                          */
13696                         if (SCTP_TCB_TRYLOCK(stcb)) {
13697                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13698                                 hold_tcblock = 1;
13699                         }
13700                 } else {
13701                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13702                 }
13703         } else if ((queue_only == 0) &&
13704                     (stcb->asoc.peers_rwnd == 0) &&
13705             (stcb->asoc.total_flight == 0)) {
13706                 /* We get to have a probe outstanding */
13707                 if (hold_tcblock == 0) {
13708                         hold_tcblock = 1;
13709                         SCTP_TCB_LOCK(stcb);
13710                 }
13711                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13712         } else if (some_on_control) {
13713                 int num_out, reason, frag_point;
13714
13715                 /* Here we do control only */
13716                 if (hold_tcblock == 0) {
13717                         hold_tcblock = 1;
13718                         SCTP_TCB_LOCK(stcb);
13719                 }
13720                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13721                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13722                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13723         }
13724         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13725             queue_only, stcb->asoc.peers_rwnd, un_sent,
13726             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13727             stcb->asoc.total_output_queue_size, error);
13728
13729 out:
13730 out_unlocked:
13731
13732         if (local_soresv && stcb) {
13733                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13734         }
13735         if (create_lock_applied) {
13736                 SCTP_ASOC_CREATE_UNLOCK(inp);
13737         }
13738         if ((stcb) && hold_tcblock) {
13739                 SCTP_TCB_UNLOCK(stcb);
13740         }
13741         if (stcb && free_cnt_applied) {
13742                 atomic_add_int(&stcb->asoc.refcnt, -1);
13743         }
13744 #ifdef INVARIANTS
13745         if (stcb) {
13746                 if (mtx_owned(&stcb->tcb_mtx)) {
13747                         panic("Leaving with tcb mtx owned?");
13748                 }
13749                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13750                         panic("Leaving with tcb send mtx owned?");
13751                 }
13752         }
13753 #endif
13754 #ifdef INVARIANTS
13755         if (inp) {
13756                 sctp_validate_no_locks(inp);
13757         } else {
13758                 printf("Warning - inp is NULL so cant validate locks\n");
13759         }
13760 #endif
13761         if (top) {
13762                 sctp_m_freem(top);
13763         }
13764         if (control) {
13765                 sctp_m_freem(control);
13766         }
13767         return (error);
13768 }
13769
13770
13771 /*
13772  * generate an AUTHentication chunk, if required
13773  */
13774 struct mbuf *
13775 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13776     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13777     struct sctp_tcb *stcb, uint8_t chunk)
13778 {
13779         struct mbuf *m_auth;
13780         struct sctp_auth_chunk *auth;
13781         int chunk_len;
13782         struct mbuf *cn;
13783
13784         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13785             (stcb == NULL))
13786                 return (m);
13787
13788         /* sysctl disabled auth? */
13789         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13790                 return (m);
13791
13792         /* peer doesn't do auth... */
13793         if (!stcb->asoc.peer_supports_auth) {
13794                 return (m);
13795         }
13796         /* does the requested chunk require auth? */
13797         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13798                 return (m);
13799         }
13800         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13801         if (m_auth == NULL) {
13802                 /* no mbuf's */
13803                 return (m);
13804         }
13805         /* reserve some space if this will be the first mbuf */
13806         if (m == NULL)
13807                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13808         /* fill in the AUTH chunk details */
13809         auth = mtod(m_auth, struct sctp_auth_chunk *);
13810         bzero(auth, sizeof(*auth));
13811         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13812         auth->ch.chunk_flags = 0;
13813         chunk_len = sizeof(*auth) +
13814             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13815         auth->ch.chunk_length = htons(chunk_len);
13816         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13817         /* key id and hmac digest will be computed and filled in upon send */
13818
13819         /* save the offset where the auth was inserted into the chain */
13820         *offset = 0;
13821         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13822                 *offset += SCTP_BUF_LEN(cn);
13823         }
13824
13825         /* update length and return pointer to the auth chunk */
13826         SCTP_BUF_LEN(m_auth) = chunk_len;
13827         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13828         if (auth_ret != NULL)
13829                 *auth_ret = auth;
13830
13831         return (m);
13832 }
13833
13834 #ifdef INET6
13835 int
13836 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13837 {
13838         struct nd_prefix *pfx = NULL;
13839         struct nd_pfxrouter *pfxrtr = NULL;
13840         struct sockaddr_in6 gw6;
13841
13842         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13843                 return (0);
13844
13845         /* get prefix entry of address */
13846         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13847                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13848                         continue;
13849                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13850                     &src6->sin6_addr, &pfx->ndpr_mask))
13851                         break;
13852         }
13853         /* no prefix entry in the prefix list */
13854         if (pfx == NULL) {
13855                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13856                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13857                 return (0);
13858         }
13859         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13860         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13861
13862         /* search installed gateway from prefix entry */
13863         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13864                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13865                 gw6.sin6_family = AF_INET6;
13866                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13867                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13868                     sizeof(struct in6_addr));
13869                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13870                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13871                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13872                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13873                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13874                     ro->ro_rt->rt_gateway)) {
13875                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13876                         return (1);
13877                 }
13878         }
13879         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13880         return (0);
13881 }
13882
13883 #endif
13884
13885 int
13886 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13887 {
13888 #ifdef INET
13889         struct sockaddr_in *sin, *mask;
13890         struct ifaddr *ifa;
13891         struct in_addr srcnetaddr, gwnetaddr;
13892
13893         if (ro == NULL || ro->ro_rt == NULL ||
13894             sifa->address.sa.sa_family != AF_INET) {
13895                 return (0);
13896         }
13897         ifa = (struct ifaddr *)sifa->ifa;
13898         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13899         sin = (struct sockaddr_in *)&sifa->address.sin;
13900         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13901         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13902         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13903         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13904
13905         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13906         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13907         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13908         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13909         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13910         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13911                 return (1);
13912         }
13913 #endif
13914         return (0);
13915 }