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 <machine/in_cksum.h>
  57
  58
  59
  60 #define SCTP_MAX_GAPS_INARRAY 4
  61 struct sack_track {
  62         uint8_t right_edge;     /* mergable on the right edge */
  63         uint8_t left_edge;      /* mergable on the left edge */
  64         uint8_t num_entries;
  65         uint8_t spare;
  66         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  67 };
  68
  69 struct sack_track sack_array[256] = {
  70         {0, 0, 0, 0,            /* 0x00 */
  71                 {{0, 0},
  72                 {0, 0},
  73                 {0, 0},
  74                 {0, 0}
  75                 }
  76         },
  77         {1, 0, 1, 0,            /* 0x01 */
  78                 {{0, 0},
  79                 {0, 0},
  80                 {0, 0},
  81                 {0, 0}
  82                 }
  83         },
  84         {0, 0, 1, 0,            /* 0x02 */
  85                 {{1, 1},
  86                 {0, 0},
  87                 {0, 0},
  88                 {0, 0}
  89                 }
  90         },
  91         {1, 0, 1, 0,            /* 0x03 */
  92                 {{0, 1},
  93                 {0, 0},
  94                 {0, 0},
  95                 {0, 0}
  96                 }
  97         },
  98         {0, 0, 1, 0,            /* 0x04 */
  99                 {{2, 2},
 100                 {0, 0},
 101                 {0, 0},
 102                 {0, 0}
 103                 }
 104         },
 105         {1, 0, 2, 0,            /* 0x05 */
 106                 {{0, 0},
 107                 {2, 2},
 108                 {0, 0},
 109                 {0, 0}
 110                 }
 111         },
 112         {0, 0, 1, 0,            /* 0x06 */
 113                 {{1, 2},
 114                 {0, 0},
 115                 {0, 0},
 116                 {0, 0}
 117                 }
 118         },
 119         {1, 0, 1, 0,            /* 0x07 */
 120                 {{0, 2},
 121                 {0, 0},
 122                 {0, 0},
 123                 {0, 0}
 124                 }
 125         },
 126         {0, 0, 1, 0,            /* 0x08 */
 127                 {{3, 3},
 128                 {0, 0},
 129                 {0, 0},
 130                 {0, 0}
 131                 }
 132         },
 133         {1, 0, 2, 0,            /* 0x09 */
 134                 {{0, 0},
 135                 {3, 3},
 136                 {0, 0},
 137                 {0, 0}
 138                 }
 139         },
 140         {0, 0, 2, 0,            /* 0x0a */
 141                 {{1, 1},
 142                 {3, 3},
 143                 {0, 0},
 144                 {0, 0}
 145                 }
 146         },
 147         {1, 0, 2, 0,            /* 0x0b */
 148                 {{0, 1},
 149                 {3, 3},
 150                 {0, 0},
 151                 {0, 0}
 152                 }
 153         },
 154         {0, 0, 1, 0,            /* 0x0c */
 155                 {{2, 3},
 156                 {0, 0},
 157                 {0, 0},
 158                 {0, 0}
 159                 }
 160         },
 161         {1, 0, 2, 0,            /* 0x0d */
 162                 {{0, 0},
 163                 {2, 3},
 164                 {0, 0},
 165                 {0, 0}
 166                 }
 167         },
 168         {0, 0, 1, 0,            /* 0x0e */
 169                 {{1, 3},
 170                 {0, 0},
 171                 {0, 0},
 172                 {0, 0}
 173                 }
 174         },
 175         {1, 0, 1, 0,            /* 0x0f */
 176                 {{0, 3},
 177                 {0, 0},
 178                 {0, 0},
 179                 {0, 0}
 180                 }
 181         },
 182         {0, 0, 1, 0,            /* 0x10 */
 183                 {{4, 4},
 184                 {0, 0},
 185                 {0, 0},
 186                 {0, 0}
 187                 }
 188         },
 189         {1, 0, 2, 0,            /* 0x11 */
 190                 {{0, 0},
 191                 {4, 4},
 192                 {0, 0},
 193                 {0, 0}
 194                 }
 195         },
 196         {0, 0, 2, 0,            /* 0x12 */
 197                 {{1, 1},
 198                 {4, 4},
 199                 {0, 0},
 200                 {0, 0}
 201                 }
 202         },
 203         {1, 0, 2, 0,            /* 0x13 */
 204                 {{0, 1},
 205                 {4, 4},
 206                 {0, 0},
 207                 {0, 0}
 208                 }
 209         },
 210         {0, 0, 2, 0,            /* 0x14 */
 211                 {{2, 2},
 212                 {4, 4},
 213                 {0, 0},
 214                 {0, 0}
 215                 }
 216         },
 217         {1, 0, 3, 0,            /* 0x15 */
 218                 {{0, 0},
 219                 {2, 2},
 220                 {4, 4},
 221                 {0, 0}
 222                 }
 223         },
 224         {0, 0, 2, 0,            /* 0x16 */
 225                 {{1, 2},
 226                 {4, 4},
 227                 {0, 0},
 228                 {0, 0}
 229                 }
 230         },
 231         {1, 0, 2, 0,            /* 0x17 */
 232                 {{0, 2},
 233                 {4, 4},
 234                 {0, 0},
 235                 {0, 0}
 236                 }
 237         },
 238         {0, 0, 1, 0,            /* 0x18 */
 239                 {{3, 4},
 240                 {0, 0},
 241                 {0, 0},
 242                 {0, 0}
 243                 }
 244         },
 245         {1, 0, 2, 0,            /* 0x19 */
 246                 {{0, 0},
 247                 {3, 4},
 248                 {0, 0},
 249                 {0, 0}
 250                 }
 251         },
 252         {0, 0, 2, 0,            /* 0x1a */
 253                 {{1, 1},
 254                 {3, 4},
 255                 {0, 0},
 256                 {0, 0}
 257                 }
 258         },
 259         {1, 0, 2, 0,            /* 0x1b */
 260                 {{0, 1},
 261                 {3, 4},
 262                 {0, 0},
 263                 {0, 0}
 264                 }
 265         },
 266         {0, 0, 1, 0,            /* 0x1c */
 267                 {{2, 4},
 268                 {0, 0},
 269                 {0, 0},
 270                 {0, 0}
 271                 }
 272         },
 273         {1, 0, 2, 0,            /* 0x1d */
 274                 {{0, 0},
 275                 {2, 4},
 276                 {0, 0},
 277                 {0, 0}
 278                 }
 279         },
 280         {0, 0, 1, 0,            /* 0x1e */
 281                 {{1, 4},
 282                 {0, 0},
 283                 {0, 0},
 284                 {0, 0}
 285                 }
 286         },
 287         {1, 0, 1, 0,            /* 0x1f */
 288                 {{0, 4},
 289                 {0, 0},
 290                 {0, 0},
 291                 {0, 0}
 292                 }
 293         },
 294         {0, 0, 1, 0,            /* 0x20 */
 295                 {{5, 5},
 296                 {0, 0},
 297                 {0, 0},
 298                 {0, 0}
 299                 }
 300         },
 301         {1, 0, 2, 0,            /* 0x21 */
 302                 {{0, 0},
 303                 {5, 5},
 304                 {0, 0},
 305                 {0, 0}
 306                 }
 307         },
 308         {0, 0, 2, 0,            /* 0x22 */
 309                 {{1, 1},
 310                 {5, 5},
 311                 {0, 0},
 312                 {0, 0}
 313                 }
 314         },
 315         {1, 0, 2, 0,            /* 0x23 */
 316                 {{0, 1},
 317                 {5, 5},
 318                 {0, 0},
 319                 {0, 0}
 320                 }
 321         },
 322         {0, 0, 2, 0,            /* 0x24 */
 323                 {{2, 2},
 324                 {5, 5},
 325                 {0, 0},
 326                 {0, 0}
 327                 }
 328         },
 329         {1, 0, 3, 0,            /* 0x25 */
 330                 {{0, 0},
 331                 {2, 2},
 332                 {5, 5},
 333                 {0, 0}
 334                 }
 335         },
 336         {0, 0, 2, 0,            /* 0x26 */
 337                 {{1, 2},
 338                 {5, 5},
 339                 {0, 0},
 340                 {0, 0}
 341                 }
 342         },
 343         {1, 0, 2, 0,            /* 0x27 */
 344                 {{0, 2},
 345                 {5, 5},
 346                 {0, 0},
 347                 {0, 0}
 348                 }
 349         },
 350         {0, 0, 2, 0,            /* 0x28 */
 351                 {{3, 3},
 352                 {5, 5},
 353                 {0, 0},
 354                 {0, 0}
 355                 }
 356         },
 357         {1, 0, 3, 0,            /* 0x29 */
 358                 {{0, 0},
 359                 {3, 3},
 360                 {5, 5},
 361                 {0, 0}
 362                 }
 363         },
 364         {0, 0, 3, 0,            /* 0x2a */
 365                 {{1, 1},
 366                 {3, 3},
 367                 {5, 5},
 368                 {0, 0}
 369                 }
 370         },
 371         {1, 0, 3, 0,            /* 0x2b */
 372                 {{0, 1},
 373                 {3, 3},
 374                 {5, 5},
 375                 {0, 0}
 376                 }
 377         },
 378         {0, 0, 2, 0,            /* 0x2c */
 379                 {{2, 3},
 380                 {5, 5},
 381                 {0, 0},
 382                 {0, 0}
 383                 }
 384         },
 385         {1, 0, 3, 0,            /* 0x2d */
 386                 {{0, 0},
 387                 {2, 3},
 388                 {5, 5},
 389                 {0, 0}
 390                 }
 391         },
 392         {0, 0, 2, 0,            /* 0x2e */
 393                 {{1, 3},
 394                 {5, 5},
 395                 {0, 0},
 396                 {0, 0}
 397                 }
 398         },
 399         {1, 0, 2, 0,            /* 0x2f */
 400                 {{0, 3},
 401                 {5, 5},
 402                 {0, 0},
 403                 {0, 0}
 404                 }
 405         },
 406         {0, 0, 1, 0,            /* 0x30 */
 407                 {{4, 5},
 408                 {0, 0},
 409                 {0, 0},
 410                 {0, 0}
 411                 }
 412         },
 413         {1, 0, 2, 0,            /* 0x31 */
 414                 {{0, 0},
 415                 {4, 5},
 416                 {0, 0},
 417                 {0, 0}
 418                 }
 419         },
 420         {0, 0, 2, 0,            /* 0x32 */
 421                 {{1, 1},
 422                 {4, 5},
 423                 {0, 0},
 424                 {0, 0}
 425                 }
 426         },
 427         {1, 0, 2, 0,            /* 0x33 */
 428                 {{0, 1},
 429                 {4, 5},
 430                 {0, 0},
 431                 {0, 0}
 432                 }
 433         },
 434         {0, 0, 2, 0,            /* 0x34 */
 435                 {{2, 2},
 436                 {4, 5},
 437                 {0, 0},
 438                 {0, 0}
 439                 }
 440         },
 441         {1, 0, 3, 0,            /* 0x35 */
 442                 {{0, 0},
 443                 {2, 2},
 444                 {4, 5},
 445                 {0, 0}
 446                 }
 447         },
 448         {0, 0, 2, 0,            /* 0x36 */
 449                 {{1, 2},
 450                 {4, 5},
 451                 {0, 0},
 452                 {0, 0}
 453                 }
 454         },
 455         {1, 0, 2, 0,            /* 0x37 */
 456                 {{0, 2},
 457                 {4, 5},
 458                 {0, 0},
 459                 {0, 0}
 460                 }
 461         },
 462         {0, 0, 1, 0,            /* 0x38 */
 463                 {{3, 5},
 464                 {0, 0},
 465                 {0, 0},
 466                 {0, 0}
 467                 }
 468         },
 469         {1, 0, 2, 0,            /* 0x39 */
 470                 {{0, 0},
 471                 {3, 5},
 472                 {0, 0},
 473                 {0, 0}
 474                 }
 475         },
 476         {0, 0, 2, 0,            /* 0x3a */
 477                 {{1, 1},
 478                 {3, 5},
 479                 {0, 0},
 480                 {0, 0}
 481                 }
 482         },
 483         {1, 0, 2, 0,            /* 0x3b */
 484                 {{0, 1},
 485                 {3, 5},
 486                 {0, 0},
 487                 {0, 0}
 488                 }
 489         },
 490         {0, 0, 1, 0,            /* 0x3c */
 491                 {{2, 5},
 492                 {0, 0},
 493                 {0, 0},
 494                 {0, 0}
 495                 }
 496         },
 497         {1, 0, 2, 0,            /* 0x3d */
 498                 {{0, 0},
 499                 {2, 5},
 500                 {0, 0},
 501                 {0, 0}
 502                 }
 503         },
 504         {0, 0, 1, 0,            /* 0x3e */
 505                 {{1, 5},
 506                 {0, 0},
 507                 {0, 0},
 508                 {0, 0}
 509                 }
 510         },
 511         {1, 0, 1, 0,            /* 0x3f */
 512                 {{0, 5},
 513                 {0, 0},
 514                 {0, 0},
 515                 {0, 0}
 516                 }
 517         },
 518         {0, 0, 1, 0,            /* 0x40 */
 519                 {{6, 6},
 520                 {0, 0},
 521                 {0, 0},
 522                 {0, 0}
 523                 }
 524         },
 525         {1, 0, 2, 0,            /* 0x41 */
 526                 {{0, 0},
 527                 {6, 6},
 528                 {0, 0},
 529                 {0, 0}
 530                 }
 531         },
 532         {0, 0, 2, 0,            /* 0x42 */
 533                 {{1, 1},
 534                 {6, 6},
 535                 {0, 0},
 536                 {0, 0}
 537                 }
 538         },
 539         {1, 0, 2, 0,            /* 0x43 */
 540                 {{0, 1},
 541                 {6, 6},
 542                 {0, 0},
 543                 {0, 0}
 544                 }
 545         },
 546         {0, 0, 2, 0,            /* 0x44 */
 547                 {{2, 2},
 548                 {6, 6},
 549                 {0, 0},
 550                 {0, 0}
 551                 }
 552         },
 553         {1, 0, 3, 0,            /* 0x45 */
 554                 {{0, 0},
 555                 {2, 2},
 556                 {6, 6},
 557                 {0, 0}
 558                 }
 559         },
 560         {0, 0, 2, 0,            /* 0x46 */
 561                 {{1, 2},
 562                 {6, 6},
 563                 {0, 0},
 564                 {0, 0}
 565                 }
 566         },
 567         {1, 0, 2, 0,            /* 0x47 */
 568                 {{0, 2},
 569                 {6, 6},
 570                 {0, 0},
 571                 {0, 0}
 572                 }
 573         },
 574         {0, 0, 2, 0,            /* 0x48 */
 575                 {{3, 3},
 576                 {6, 6},
 577                 {0, 0},
 578                 {0, 0}
 579                 }
 580         },
 581         {1, 0, 3, 0,            /* 0x49 */
 582                 {{0, 0},
 583                 {3, 3},
 584                 {6, 6},
 585                 {0, 0}
 586                 }
 587         },
 588         {0, 0, 3, 0,            /* 0x4a */
 589                 {{1, 1},
 590                 {3, 3},
 591                 {6, 6},
 592                 {0, 0}
 593                 }
 594         },
 595         {1, 0, 3, 0,            /* 0x4b */
 596                 {{0, 1},
 597                 {3, 3},
 598                 {6, 6},
 599                 {0, 0}
 600                 }
 601         },
 602         {0, 0, 2, 0,            /* 0x4c */
 603                 {{2, 3},
 604                 {6, 6},
 605                 {0, 0},
 606                 {0, 0}
 607                 }
 608         },
 609         {1, 0, 3, 0,            /* 0x4d */
 610                 {{0, 0},
 611                 {2, 3},
 612                 {6, 6},
 613                 {0, 0}
 614                 }
 615         },
 616         {0, 0, 2, 0,            /* 0x4e */
 617                 {{1, 3},
 618                 {6, 6},
 619                 {0, 0},
 620                 {0, 0}
 621                 }
 622         },
 623         {1, 0, 2, 0,            /* 0x4f */
 624                 {{0, 3},
 625                 {6, 6},
 626                 {0, 0},
 627                 {0, 0}
 628                 }
 629         },
 630         {0, 0, 2, 0,            /* 0x50 */
 631                 {{4, 4},
 632                 {6, 6},
 633                 {0, 0},
 634                 {0, 0}
 635                 }
 636         },
 637         {1, 0, 3, 0,            /* 0x51 */
 638                 {{0, 0},
 639                 {4, 4},
 640                 {6, 6},
 641                 {0, 0}
 642                 }
 643         },
 644         {0, 0, 3, 0,            /* 0x52 */
 645                 {{1, 1},
 646                 {4, 4},
 647                 {6, 6},
 648                 {0, 0}
 649                 }
 650         },
 651         {1, 0, 3, 0,            /* 0x53 */
 652                 {{0, 1},
 653                 {4, 4},
 654                 {6, 6},
 655                 {0, 0}
 656                 }
 657         },
 658         {0, 0, 3, 0,            /* 0x54 */
 659                 {{2, 2},
 660                 {4, 4},
 661                 {6, 6},
 662                 {0, 0}
 663                 }
 664         },
 665         {1, 0, 4, 0,            /* 0x55 */
 666                 {{0, 0},
 667                 {2, 2},
 668                 {4, 4},
 669                 {6, 6}
 670                 }
 671         },
 672         {0, 0, 3, 0,            /* 0x56 */
 673                 {{1, 2},
 674                 {4, 4},
 675                 {6, 6},
 676                 {0, 0}
 677                 }
 678         },
 679         {1, 0, 3, 0,            /* 0x57 */
 680                 {{0, 2},
 681                 {4, 4},
 682                 {6, 6},
 683                 {0, 0}
 684                 }
 685         },
 686         {0, 0, 2, 0,            /* 0x58 */
 687                 {{3, 4},
 688                 {6, 6},
 689                 {0, 0},
 690                 {0, 0}
 691                 }
 692         },
 693         {1, 0, 3, 0,            /* 0x59 */
 694                 {{0, 0},
 695                 {3, 4},
 696                 {6, 6},
 697                 {0, 0}
 698                 }
 699         },
 700         {0, 0, 3, 0,            /* 0x5a */
 701                 {{1, 1},
 702                 {3, 4},
 703                 {6, 6},
 704                 {0, 0}
 705                 }
 706         },
 707         {1, 0, 3, 0,            /* 0x5b */
 708                 {{0, 1},
 709                 {3, 4},
 710                 {6, 6},
 711                 {0, 0}
 712                 }
 713         },
 714         {0, 0, 2, 0,            /* 0x5c */
 715                 {{2, 4},
 716                 {6, 6},
 717                 {0, 0},
 718                 {0, 0}
 719                 }
 720         },
 721         {1, 0, 3, 0,            /* 0x5d */
 722                 {{0, 0},
 723                 {2, 4},
 724                 {6, 6},
 725                 {0, 0}
 726                 }
 727         },
 728         {0, 0, 2, 0,            /* 0x5e */
 729                 {{1, 4},
 730                 {6, 6},
 731                 {0, 0},
 732                 {0, 0}
 733                 }
 734         },
 735         {1, 0, 2, 0,            /* 0x5f */
 736                 {{0, 4},
 737                 {6, 6},
 738                 {0, 0},
 739                 {0, 0}
 740                 }
 741         },
 742         {0, 0, 1, 0,            /* 0x60 */
 743                 {{5, 6},
 744                 {0, 0},
 745                 {0, 0},
 746                 {0, 0}
 747                 }
 748         },
 749         {1, 0, 2, 0,            /* 0x61 */
 750                 {{0, 0},
 751                 {5, 6},
 752                 {0, 0},
 753                 {0, 0}
 754                 }
 755         },
 756         {0, 0, 2, 0,            /* 0x62 */
 757                 {{1, 1},
 758                 {5, 6},
 759                 {0, 0},
 760                 {0, 0}
 761                 }
 762         },
 763         {1, 0, 2, 0,            /* 0x63 */
 764                 {{0, 1},
 765                 {5, 6},
 766                 {0, 0},
 767                 {0, 0}
 768                 }
 769         },
 770         {0, 0, 2, 0,            /* 0x64 */
 771                 {{2, 2},
 772                 {5, 6},
 773                 {0, 0},
 774                 {0, 0}
 775                 }
 776         },
 777         {1, 0, 3, 0,            /* 0x65 */
 778                 {{0, 0},
 779                 {2, 2},
 780                 {5, 6},
 781                 {0, 0}
 782                 }
 783         },
 784         {0, 0, 2, 0,            /* 0x66 */
 785                 {{1, 2},
 786                 {5, 6},
 787                 {0, 0},
 788                 {0, 0}
 789                 }
 790         },
 791         {1, 0, 2, 0,            /* 0x67 */
 792                 {{0, 2},
 793                 {5, 6},
 794                 {0, 0},
 795                 {0, 0}
 796                 }
 797         },
 798         {0, 0, 2, 0,            /* 0x68 */
 799                 {{3, 3},
 800                 {5, 6},
 801                 {0, 0},
 802                 {0, 0}
 803                 }
 804         },
 805         {1, 0, 3, 0,            /* 0x69 */
 806                 {{0, 0},
 807                 {3, 3},
 808                 {5, 6},
 809                 {0, 0}
 810                 }
 811         },
 812         {0, 0, 3, 0,            /* 0x6a */
 813                 {{1, 1},
 814                 {3, 3},
 815                 {5, 6},
 816                 {0, 0}
 817                 }
 818         },
 819         {1, 0, 3, 0,            /* 0x6b */
 820                 {{0, 1},
 821                 {3, 3},
 822                 {5, 6},
 823                 {0, 0}
 824                 }
 825         },
 826         {0, 0, 2, 0,            /* 0x6c */
 827                 {{2, 3},
 828                 {5, 6},
 829                 {0, 0},
 830                 {0, 0}
 831                 }
 832         },
 833         {1, 0, 3, 0,            /* 0x6d */
 834                 {{0, 0},
 835                 {2, 3},
 836                 {5, 6},
 837                 {0, 0}
 838                 }
 839         },
 840         {0, 0, 2, 0,            /* 0x6e */
 841                 {{1, 3},
 842                 {5, 6},
 843                 {0, 0},
 844                 {0, 0}
 845                 }
 846         },
 847         {1, 0, 2, 0,            /* 0x6f */
 848                 {{0, 3},
 849                 {5, 6},
 850                 {0, 0},
 851                 {0, 0}
 852                 }
 853         },
 854         {0, 0, 1, 0,            /* 0x70 */
 855                 {{4, 6},
 856                 {0, 0},
 857                 {0, 0},
 858                 {0, 0}
 859                 }
 860         },
 861         {1, 0, 2, 0,            /* 0x71 */
 862                 {{0, 0},
 863                 {4, 6},
 864                 {0, 0},
 865                 {0, 0}
 866                 }
 867         },
 868         {0, 0, 2, 0,            /* 0x72 */
 869                 {{1, 1},
 870                 {4, 6},
 871                 {0, 0},
 872                 {0, 0}
 873                 }
 874         },
 875         {1, 0, 2, 0,            /* 0x73 */
 876                 {{0, 1},
 877                 {4, 6},
 878                 {0, 0},
 879                 {0, 0}
 880                 }
 881         },
 882         {0, 0, 2, 0,            /* 0x74 */
 883                 {{2, 2},
 884                 {4, 6},
 885                 {0, 0},
 886                 {0, 0}
 887                 }
 888         },
 889         {1, 0, 3, 0,            /* 0x75 */
 890                 {{0, 0},
 891                 {2, 2},
 892                 {4, 6},
 893                 {0, 0}
 894                 }
 895         },
 896         {0, 0, 2, 0,            /* 0x76 */
 897                 {{1, 2},
 898                 {4, 6},
 899                 {0, 0},
 900                 {0, 0}
 901                 }
 902         },
 903         {1, 0, 2, 0,            /* 0x77 */
 904                 {{0, 2},
 905                 {4, 6},
 906                 {0, 0},
 907                 {0, 0}
 908                 }
 909         },
 910         {0, 0, 1, 0,            /* 0x78 */
 911                 {{3, 6},
 912                 {0, 0},
 913                 {0, 0},
 914                 {0, 0}
 915                 }
 916         },
 917         {1, 0, 2, 0,            /* 0x79 */
 918                 {{0, 0},
 919                 {3, 6},
 920                 {0, 0},
 921                 {0, 0}
 922                 }
 923         },
 924         {0, 0, 2, 0,            /* 0x7a */
 925                 {{1, 1},
 926                 {3, 6},
 927                 {0, 0},
 928                 {0, 0}
 929                 }
 930         },
 931         {1, 0, 2, 0,            /* 0x7b */
 932                 {{0, 1},
 933                 {3, 6},
 934                 {0, 0},
 935                 {0, 0}
 936                 }
 937         },
 938         {0, 0, 1, 0,            /* 0x7c */
 939                 {{2, 6},
 940                 {0, 0},
 941                 {0, 0},
 942                 {0, 0}
 943                 }
 944         },
 945         {1, 0, 2, 0,            /* 0x7d */
 946                 {{0, 0},
 947                 {2, 6},
 948                 {0, 0},
 949                 {0, 0}
 950                 }
 951         },
 952         {0, 0, 1, 0,            /* 0x7e */
 953                 {{1, 6},
 954                 {0, 0},
 955                 {0, 0},
 956                 {0, 0}
 957                 }
 958         },
 959         {1, 0, 1, 0,            /* 0x7f */
 960                 {{0, 6},
 961                 {0, 0},
 962                 {0, 0},
 963                 {0, 0}
 964                 }
 965         },
 966         {0, 1, 1, 0,            /* 0x80 */
 967                 {{7, 7},
 968                 {0, 0},
 969                 {0, 0},
 970                 {0, 0}
 971                 }
 972         },
 973         {1, 1, 2, 0,            /* 0x81 */
 974                 {{0, 0},
 975                 {7, 7},
 976                 {0, 0},
 977                 {0, 0}
 978                 }
 979         },
 980         {0, 1, 2, 0,            /* 0x82 */
 981                 {{1, 1},
 982                 {7, 7},
 983                 {0, 0},
 984                 {0, 0}
 985                 }
 986         },
 987         {1, 1, 2, 0,            /* 0x83 */
 988                 {{0, 1},
 989                 {7, 7},
 990                 {0, 0},
 991                 {0, 0}
 992                 }
 993         },
 994         {0, 1, 2, 0,            /* 0x84 */
 995                 {{2, 2},
 996                 {7, 7},
 997                 {0, 0},
 998                 {0, 0}
 999                 }
1000         },
1001         {1, 1, 3, 0,            /* 0x85 */
1002                 {{0, 0},
1003                 {2, 2},
1004                 {7, 7},
1005                 {0, 0}
1006                 }
1007         },
1008         {0, 1, 2, 0,            /* 0x86 */
1009                 {{1, 2},
1010                 {7, 7},
1011                 {0, 0},
1012                 {0, 0}
1013                 }
1014         },
1015         {1, 1, 2, 0,            /* 0x87 */
1016                 {{0, 2},
1017                 {7, 7},
1018                 {0, 0},
1019                 {0, 0}
1020                 }
1021         },
1022         {0, 1, 2, 0,            /* 0x88 */
1023                 {{3, 3},
1024                 {7, 7},
1025                 {0, 0},
1026                 {0, 0}
1027                 }
1028         },
1029         {1, 1, 3, 0,            /* 0x89 */
1030                 {{0, 0},
1031                 {3, 3},
1032                 {7, 7},
1033                 {0, 0}
1034                 }
1035         },
1036         {0, 1, 3, 0,            /* 0x8a */
1037                 {{1, 1},
1038                 {3, 3},
1039                 {7, 7},
1040                 {0, 0}
1041                 }
1042         },
1043         {1, 1, 3, 0,            /* 0x8b */
1044                 {{0, 1},
1045                 {3, 3},
1046                 {7, 7},
1047                 {0, 0}
1048                 }
1049         },
1050         {0, 1, 2, 0,            /* 0x8c */
1051                 {{2, 3},
1052                 {7, 7},
1053                 {0, 0},
1054                 {0, 0}
1055                 }
1056         },
1057         {1, 1, 3, 0,            /* 0x8d */
1058                 {{0, 0},
1059                 {2, 3},
1060                 {7, 7},
1061                 {0, 0}
1062                 }
1063         },
1064         {0, 1, 2, 0,            /* 0x8e */
1065                 {{1, 3},
1066                 {7, 7},
1067                 {0, 0},
1068                 {0, 0}
1069                 }
1070         },
1071         {1, 1, 2, 0,            /* 0x8f */
1072                 {{0, 3},
1073                 {7, 7},
1074                 {0, 0},
1075                 {0, 0}
1076                 }
1077         },
1078         {0, 1, 2, 0,            /* 0x90 */
1079                 {{4, 4},
1080                 {7, 7},
1081                 {0, 0},
1082                 {0, 0}
1083                 }
1084         },
1085         {1, 1, 3, 0,            /* 0x91 */
1086                 {{0, 0},
1087                 {4, 4},
1088                 {7, 7},
1089                 {0, 0}
1090                 }
1091         },
1092         {0, 1, 3, 0,            /* 0x92 */
1093                 {{1, 1},
1094                 {4, 4},
1095                 {7, 7},
1096                 {0, 0}
1097                 }
1098         },
1099         {1, 1, 3, 0,            /* 0x93 */
1100                 {{0, 1},
1101                 {4, 4},
1102                 {7, 7},
1103                 {0, 0}
1104                 }
1105         },
1106         {0, 1, 3, 0,            /* 0x94 */
1107                 {{2, 2},
1108                 {4, 4},
1109                 {7, 7},
1110                 {0, 0}
1111                 }
1112         },
1113         {1, 1, 4, 0,            /* 0x95 */
1114                 {{0, 0},
1115                 {2, 2},
1116                 {4, 4},
1117                 {7, 7}
1118                 }
1119         },
1120         {0, 1, 3, 0,            /* 0x96 */
1121                 {{1, 2},
1122                 {4, 4},
1123                 {7, 7},
1124                 {0, 0}
1125                 }
1126         },
1127         {1, 1, 3, 0,            /* 0x97 */
1128                 {{0, 2},
1129                 {4, 4},
1130                 {7, 7},
1131                 {0, 0}
1132                 }
1133         },
1134         {0, 1, 2, 0,            /* 0x98 */
1135                 {{3, 4},
1136                 {7, 7},
1137                 {0, 0},
1138                 {0, 0}
1139                 }
1140         },
1141         {1, 1, 3, 0,            /* 0x99 */
1142                 {{0, 0},
1143                 {3, 4},
1144                 {7, 7},
1145                 {0, 0}
1146                 }
1147         },
1148         {0, 1, 3, 0,            /* 0x9a */
1149                 {{1, 1},
1150                 {3, 4},
1151                 {7, 7},
1152                 {0, 0}
1153                 }
1154         },
1155         {1, 1, 3, 0,            /* 0x9b */
1156                 {{0, 1},
1157                 {3, 4},
1158                 {7, 7},
1159                 {0, 0}
1160                 }
1161         },
1162         {0, 1, 2, 0,            /* 0x9c */
1163                 {{2, 4},
1164                 {7, 7},
1165                 {0, 0},
1166                 {0, 0}
1167                 }
1168         },
1169         {1, 1, 3, 0,            /* 0x9d */
1170                 {{0, 0},
1171                 {2, 4},
1172                 {7, 7},
1173                 {0, 0}
1174                 }
1175         },
1176         {0, 1, 2, 0,            /* 0x9e */
1177                 {{1, 4},
1178                 {7, 7},
1179                 {0, 0},
1180                 {0, 0}
1181                 }
1182         },
1183         {1, 1, 2, 0,            /* 0x9f */
1184                 {{0, 4},
1185                 {7, 7},
1186                 {0, 0},
1187                 {0, 0}
1188                 }
1189         },
1190         {0, 1, 2, 0,            /* 0xa0 */
1191                 {{5, 5},
1192                 {7, 7},
1193                 {0, 0},
1194                 {0, 0}
1195                 }
1196         },
1197         {1, 1, 3, 0,            /* 0xa1 */
1198                 {{0, 0},
1199                 {5, 5},
1200                 {7, 7},
1201                 {0, 0}
1202                 }
1203         },
1204         {0, 1, 3, 0,            /* 0xa2 */
1205                 {{1, 1},
1206                 {5, 5},
1207                 {7, 7},
1208                 {0, 0}
1209                 }
1210         },
1211         {1, 1, 3, 0,            /* 0xa3 */
1212                 {{0, 1},
1213                 {5, 5},
1214                 {7, 7},
1215                 {0, 0}
1216                 }
1217         },
1218         {0, 1, 3, 0,            /* 0xa4 */
1219                 {{2, 2},
1220                 {5, 5},
1221                 {7, 7},
1222                 {0, 0}
1223                 }
1224         },
1225         {1, 1, 4, 0,            /* 0xa5 */
1226                 {{0, 0},
1227                 {2, 2},
1228                 {5, 5},
1229                 {7, 7}
1230                 }
1231         },
1232         {0, 1, 3, 0,            /* 0xa6 */
1233                 {{1, 2},
1234                 {5, 5},
1235                 {7, 7},
1236                 {0, 0}
1237                 }
1238         },
1239         {1, 1, 3, 0,            /* 0xa7 */
1240                 {{0, 2},
1241                 {5, 5},
1242                 {7, 7},
1243                 {0, 0}
1244                 }
1245         },
1246         {0, 1, 3, 0,            /* 0xa8 */
1247                 {{3, 3},
1248                 {5, 5},
1249                 {7, 7},
1250                 {0, 0}
1251                 }
1252         },
1253         {1, 1, 4, 0,            /* 0xa9 */
1254                 {{0, 0},
1255                 {3, 3},
1256                 {5, 5},
1257                 {7, 7}
1258                 }
1259         },
1260         {0, 1, 4, 0,            /* 0xaa */
1261                 {{1, 1},
1262                 {3, 3},
1263                 {5, 5},
1264                 {7, 7}
1265                 }
1266         },
1267         {1, 1, 4, 0,            /* 0xab */
1268                 {{0, 1},
1269                 {3, 3},
1270                 {5, 5},
1271                 {7, 7}
1272                 }
1273         },
1274         {0, 1, 3, 0,            /* 0xac */
1275                 {{2, 3},
1276                 {5, 5},
1277                 {7, 7},
1278                 {0, 0}
1279                 }
1280         },
1281         {1, 1, 4, 0,            /* 0xad */
1282                 {{0, 0},
1283                 {2, 3},
1284                 {5, 5},
1285                 {7, 7}
1286                 }
1287         },
1288         {0, 1, 3, 0,            /* 0xae */
1289                 {{1, 3},
1290                 {5, 5},
1291                 {7, 7},
1292                 {0, 0}
1293                 }
1294         },
1295         {1, 1, 3, 0,            /* 0xaf */
1296                 {{0, 3},
1297                 {5, 5},
1298                 {7, 7},
1299                 {0, 0}
1300                 }
1301         },
1302         {0, 1, 2, 0,            /* 0xb0 */
1303                 {{4, 5},
1304                 {7, 7},
1305                 {0, 0},
1306                 {0, 0}
1307                 }
1308         },
1309         {1, 1, 3, 0,            /* 0xb1 */
1310                 {{0, 0},
1311                 {4, 5},
1312                 {7, 7},
1313                 {0, 0}
1314                 }
1315         },
1316         {0, 1, 3, 0,            /* 0xb2 */
1317                 {{1, 1},
1318                 {4, 5},
1319                 {7, 7},
1320                 {0, 0}
1321                 }
1322         },
1323         {1, 1, 3, 0,            /* 0xb3 */
1324                 {{0, 1},
1325                 {4, 5},
1326                 {7, 7},
1327                 {0, 0}
1328                 }
1329         },
1330         {0, 1, 3, 0,            /* 0xb4 */
1331                 {{2, 2},
1332                 {4, 5},
1333                 {7, 7},
1334                 {0, 0}
1335                 }
1336         },
1337         {1, 1, 4, 0,            /* 0xb5 */
1338                 {{0, 0},
1339                 {2, 2},
1340                 {4, 5},
1341                 {7, 7}
1342                 }
1343         },
1344         {0, 1, 3, 0,            /* 0xb6 */
1345                 {{1, 2},
1346                 {4, 5},
1347                 {7, 7},
1348                 {0, 0}
1349                 }
1350         },
1351         {1, 1, 3, 0,            /* 0xb7 */
1352                 {{0, 2},
1353                 {4, 5},
1354                 {7, 7},
1355                 {0, 0}
1356                 }
1357         },
1358         {0, 1, 2, 0,            /* 0xb8 */
1359                 {{3, 5},
1360                 {7, 7},
1361                 {0, 0},
1362                 {0, 0}
1363                 }
1364         },
1365         {1, 1, 3, 0,            /* 0xb9 */
1366                 {{0, 0},
1367                 {3, 5},
1368                 {7, 7},
1369                 {0, 0}
1370                 }
1371         },
1372         {0, 1, 3, 0,            /* 0xba */
1373                 {{1, 1},
1374                 {3, 5},
1375                 {7, 7},
1376                 {0, 0}
1377                 }
1378         },
1379         {1, 1, 3, 0,            /* 0xbb */
1380                 {{0, 1},
1381                 {3, 5},
1382                 {7, 7},
1383                 {0, 0}
1384                 }
1385         },
1386         {0, 1, 2, 0,            /* 0xbc */
1387                 {{2, 5},
1388                 {7, 7},
1389                 {0, 0},
1390                 {0, 0}
1391                 }
1392         },
1393         {1, 1, 3, 0,            /* 0xbd */
1394                 {{0, 0},
1395                 {2, 5},
1396                 {7, 7},
1397                 {0, 0}
1398                 }
1399         },
1400         {0, 1, 2, 0,            /* 0xbe */
1401                 {{1, 5},
1402                 {7, 7},
1403                 {0, 0},
1404                 {0, 0}
1405                 }
1406         },
1407         {1, 1, 2, 0,            /* 0xbf */
1408                 {{0, 5},
1409                 {7, 7},
1410                 {0, 0},
1411                 {0, 0}
1412                 }
1413         },
1414         {0, 1, 1, 0,            /* 0xc0 */
1415                 {{6, 7},
1416                 {0, 0},
1417                 {0, 0},
1418                 {0, 0}
1419                 }
1420         },
1421         {1, 1, 2, 0,            /* 0xc1 */
1422                 {{0, 0},
1423                 {6, 7},
1424                 {0, 0},
1425                 {0, 0}
1426                 }
1427         },
1428         {0, 1, 2, 0,            /* 0xc2 */
1429                 {{1, 1},
1430                 {6, 7},
1431                 {0, 0},
1432                 {0, 0}
1433                 }
1434         },
1435         {1, 1, 2, 0,            /* 0xc3 */
1436                 {{0, 1},
1437                 {6, 7},
1438                 {0, 0},
1439                 {0, 0}
1440                 }
1441         },
1442         {0, 1, 2, 0,            /* 0xc4 */
1443                 {{2, 2},
1444                 {6, 7},
1445                 {0, 0},
1446                 {0, 0}
1447                 }
1448         },
1449         {1, 1, 3, 0,            /* 0xc5 */
1450                 {{0, 0},
1451                 {2, 2},
1452                 {6, 7},
1453                 {0, 0}
1454                 }
1455         },
1456         {0, 1, 2, 0,            /* 0xc6 */
1457                 {{1, 2},
1458                 {6, 7},
1459                 {0, 0},
1460                 {0, 0}
1461                 }
1462         },
1463         {1, 1, 2, 0,            /* 0xc7 */
1464                 {{0, 2},
1465                 {6, 7},
1466                 {0, 0},
1467                 {0, 0}
1468                 }
1469         },
1470         {0, 1, 2, 0,            /* 0xc8 */
1471                 {{3, 3},
1472                 {6, 7},
1473                 {0, 0},
1474                 {0, 0}
1475                 }
1476         },
1477         {1, 1, 3, 0,            /* 0xc9 */
1478                 {{0, 0},
1479                 {3, 3},
1480                 {6, 7},
1481                 {0, 0}
1482                 }
1483         },
1484         {0, 1, 3, 0,            /* 0xca */
1485                 {{1, 1},
1486                 {3, 3},
1487                 {6, 7},
1488                 {0, 0}
1489                 }
1490         },
1491         {1, 1, 3, 0,            /* 0xcb */
1492                 {{0, 1},
1493                 {3, 3},
1494                 {6, 7},
1495                 {0, 0}
1496                 }
1497         },
1498         {0, 1, 2, 0,            /* 0xcc */
1499                 {{2, 3},
1500                 {6, 7},
1501                 {0, 0},
1502                 {0, 0}
1503                 }
1504         },
1505         {1, 1, 3, 0,            /* 0xcd */
1506                 {{0, 0},
1507                 {2, 3},
1508                 {6, 7},
1509                 {0, 0}
1510                 }
1511         },
1512         {0, 1, 2, 0,            /* 0xce */
1513                 {{1, 3},
1514                 {6, 7},
1515                 {0, 0},
1516                 {0, 0}
1517                 }
1518         },
1519         {1, 1, 2, 0,            /* 0xcf */
1520                 {{0, 3},
1521                 {6, 7},
1522                 {0, 0},
1523                 {0, 0}
1524                 }
1525         },
1526         {0, 1, 2, 0,            /* 0xd0 */
1527                 {{4, 4},
1528                 {6, 7},
1529                 {0, 0},
1530                 {0, 0}
1531                 }
1532         },
1533         {1, 1, 3, 0,            /* 0xd1 */
1534                 {{0, 0},
1535                 {4, 4},
1536                 {6, 7},
1537                 {0, 0}
1538                 }
1539         },
1540         {0, 1, 3, 0,            /* 0xd2 */
1541                 {{1, 1},
1542                 {4, 4},
1543                 {6, 7},
1544                 {0, 0}
1545                 }
1546         },
1547         {1, 1, 3, 0,            /* 0xd3 */
1548                 {{0, 1},
1549                 {4, 4},
1550                 {6, 7},
1551                 {0, 0}
1552                 }
1553         },
1554         {0, 1, 3, 0,            /* 0xd4 */
1555                 {{2, 2},
1556                 {4, 4},
1557                 {6, 7},
1558                 {0, 0}
1559                 }
1560         },
1561         {1, 1, 4, 0,            /* 0xd5 */
1562                 {{0, 0},
1563                 {2, 2},
1564                 {4, 4},
1565                 {6, 7}
1566                 }
1567         },
1568         {0, 1, 3, 0,            /* 0xd6 */
1569                 {{1, 2},
1570                 {4, 4},
1571                 {6, 7},
1572                 {0, 0}
1573                 }
1574         },
1575         {1, 1, 3, 0,            /* 0xd7 */
1576                 {{0, 2},
1577                 {4, 4},
1578                 {6, 7},
1579                 {0, 0}
1580                 }
1581         },
1582         {0, 1, 2, 0,            /* 0xd8 */
1583                 {{3, 4},
1584                 {6, 7},
1585                 {0, 0},
1586                 {0, 0}
1587                 }
1588         },
1589         {1, 1, 3, 0,            /* 0xd9 */
1590                 {{0, 0},
1591                 {3, 4},
1592                 {6, 7},
1593                 {0, 0}
1594                 }
1595         },
1596         {0, 1, 3, 0,            /* 0xda */
1597                 {{1, 1},
1598                 {3, 4},
1599                 {6, 7},
1600                 {0, 0}
1601                 }
1602         },
1603         {1, 1, 3, 0,            /* 0xdb */
1604                 {{0, 1},
1605                 {3, 4},
1606                 {6, 7},
1607                 {0, 0}
1608                 }
1609         },
1610         {0, 1, 2, 0,            /* 0xdc */
1611                 {{2, 4},
1612                 {6, 7},
1613                 {0, 0},
1614                 {0, 0}
1615                 }
1616         },
1617         {1, 1, 3, 0,            /* 0xdd */
1618                 {{0, 0},
1619                 {2, 4},
1620                 {6, 7},
1621                 {0, 0}
1622                 }
1623         },
1624         {0, 1, 2, 0,            /* 0xde */
1625                 {{1, 4},
1626                 {6, 7},
1627                 {0, 0},
1628                 {0, 0}
1629                 }
1630         },
1631         {1, 1, 2, 0,            /* 0xdf */
1632                 {{0, 4},
1633                 {6, 7},
1634                 {0, 0},
1635                 {0, 0}
1636                 }
1637         },
1638         {0, 1, 1, 0,            /* 0xe0 */
1639                 {{5, 7},
1640                 {0, 0},
1641                 {0, 0},
1642                 {0, 0}
1643                 }
1644         },
1645         {1, 1, 2, 0,            /* 0xe1 */
1646                 {{0, 0},
1647                 {5, 7},
1648                 {0, 0},
1649                 {0, 0}
1650                 }
1651         },
1652         {0, 1, 2, 0,            /* 0xe2 */
1653                 {{1, 1},
1654                 {5, 7},
1655                 {0, 0},
1656                 {0, 0}
1657                 }
1658         },
1659         {1, 1, 2, 0,            /* 0xe3 */
1660                 {{0, 1},
1661                 {5, 7},
1662                 {0, 0},
1663                 {0, 0}
1664                 }
1665         },
1666         {0, 1, 2, 0,            /* 0xe4 */
1667                 {{2, 2},
1668                 {5, 7},
1669                 {0, 0},
1670                 {0, 0}
1671                 }
1672         },
1673         {1, 1, 3, 0,            /* 0xe5 */
1674                 {{0, 0},
1675                 {2, 2},
1676                 {5, 7},
1677                 {0, 0}
1678                 }
1679         },
1680         {0, 1, 2, 0,            /* 0xe6 */
1681                 {{1, 2},
1682                 {5, 7},
1683                 {0, 0},
1684                 {0, 0}
1685                 }
1686         },
1687         {1, 1, 2, 0,            /* 0xe7 */
1688                 {{0, 2},
1689                 {5, 7},
1690                 {0, 0},
1691                 {0, 0}
1692                 }
1693         },
1694         {0, 1, 2, 0,            /* 0xe8 */
1695                 {{3, 3},
1696                 {5, 7},
1697                 {0, 0},
1698                 {0, 0}
1699                 }
1700         },
1701         {1, 1, 3, 0,            /* 0xe9 */
1702                 {{0, 0},
1703                 {3, 3},
1704                 {5, 7},
1705                 {0, 0}
1706                 }
1707         },
1708         {0, 1, 3, 0,            /* 0xea */
1709                 {{1, 1},
1710                 {3, 3},
1711                 {5, 7},
1712                 {0, 0}
1713                 }
1714         },
1715         {1, 1, 3, 0,            /* 0xeb */
1716                 {{0, 1},
1717                 {3, 3},
1718                 {5, 7},
1719                 {0, 0}
1720                 }
1721         },
1722         {0, 1, 2, 0,            /* 0xec */
1723                 {{2, 3},
1724                 {5, 7},
1725                 {0, 0},
1726                 {0, 0}
1727                 }
1728         },
1729         {1, 1, 3, 0,            /* 0xed */
1730                 {{0, 0},
1731                 {2, 3},
1732                 {5, 7},
1733                 {0, 0}
1734                 }
1735         },
1736         {0, 1, 2, 0,            /* 0xee */
1737                 {{1, 3},
1738                 {5, 7},
1739                 {0, 0},
1740                 {0, 0}
1741                 }
1742         },
1743         {1, 1, 2, 0,            /* 0xef */
1744                 {{0, 3},
1745                 {5, 7},
1746                 {0, 0},
1747                 {0, 0}
1748                 }
1749         },
1750         {0, 1, 1, 0,            /* 0xf0 */
1751                 {{4, 7},
1752                 {0, 0},
1753                 {0, 0},
1754                 {0, 0}
1755                 }
1756         },
1757         {1, 1, 2, 0,            /* 0xf1 */
1758                 {{0, 0},
1759                 {4, 7},
1760                 {0, 0},
1761                 {0, 0}
1762                 }
1763         },
1764         {0, 1, 2, 0,            /* 0xf2 */
1765                 {{1, 1},
1766                 {4, 7},
1767                 {0, 0},
1768                 {0, 0}
1769                 }
1770         },
1771         {1, 1, 2, 0,            /* 0xf3 */
1772                 {{0, 1},
1773                 {4, 7},
1774                 {0, 0},
1775                 {0, 0}
1776                 }
1777         },
1778         {0, 1, 2, 0,            /* 0xf4 */
1779                 {{2, 2},
1780                 {4, 7},
1781                 {0, 0},
1782                 {0, 0}
1783                 }
1784         },
1785         {1, 1, 3, 0,            /* 0xf5 */
1786                 {{0, 0},
1787                 {2, 2},
1788                 {4, 7},
1789                 {0, 0}
1790                 }
1791         },
1792         {0, 1, 2, 0,            /* 0xf6 */
1793                 {{1, 2},
1794                 {4, 7},
1795                 {0, 0},
1796                 {0, 0}
1797                 }
1798         },
1799         {1, 1, 2, 0,            /* 0xf7 */
1800                 {{0, 2},
1801                 {4, 7},
1802                 {0, 0},
1803                 {0, 0}
1804                 }
1805         },
1806         {0, 1, 1, 0,            /* 0xf8 */
1807                 {{3, 7},
1808                 {0, 0},
1809                 {0, 0},
1810                 {0, 0}
1811                 }
1812         },
1813         {1, 1, 2, 0,            /* 0xf9 */
1814                 {{0, 0},
1815                 {3, 7},
1816                 {0, 0},
1817                 {0, 0}
1818                 }
1819         },
1820         {0, 1, 2, 0,            /* 0xfa */
1821                 {{1, 1},
1822                 {3, 7},
1823                 {0, 0},
1824                 {0, 0}
1825                 }
1826         },
1827         {1, 1, 2, 0,            /* 0xfb */
1828                 {{0, 1},
1829                 {3, 7},
1830                 {0, 0},
1831                 {0, 0}
1832                 }
1833         },
1834         {0, 1, 1, 0,            /* 0xfc */
1835                 {{2, 7},
1836                 {0, 0},
1837                 {0, 0},
1838                 {0, 0}
1839                 }
1840         },
1841         {1, 1, 2, 0,            /* 0xfd */
1842                 {{0, 0},
1843                 {2, 7},
1844                 {0, 0},
1845                 {0, 0}
1846                 }
1847         },
1848         {0, 1, 1, 0,            /* 0xfe */
1849                 {{1, 7},
1850                 {0, 0},
1851                 {0, 0},
1852                 {0, 0}
1853                 }
1854         },
1855         {1, 1, 1, 0,            /* 0xff */
1856                 {{0, 7},
1857                 {0, 0},
1858                 {0, 0},
1859                 {0, 0}
1860                 }
1861         }
1862 };
1863
1864
1865 int
1866 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1867     int ipv4_addr_legal,
1868     int ipv6_addr_legal,
1869     int loopback_scope,
1870     int ipv4_local_scope,
1871     int local_scope,
1872     int site_scope,
1873     int do_update)
1874 {
1875         if ((loopback_scope == 0) &&
1876             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1877                 /*
1878                  * skip loopback if not in scope *
1879                  */
1880                 return (0);
1881         }
1882         switch (ifa->address.sa.sa_family) {
1883         case AF_INET:
1884                 if (ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = (struct sockaddr_in *)&ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #ifdef INET6
1902         case AF_INET6:
1903                 if (ipv6_addr_legal) {
1904                         struct sockaddr_in6 *sin6;
1905
1906                         /*
1907                          * Must update the flags,  bummer, which means any
1908                          * IFA locks must now be applied HERE <->
1909                          */
1910                         if (do_update) {
1911                                 sctp_gather_internal_ifa_flags(ifa);
1912                         }
1913                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1914                                 return (0);
1915                         }
1916                         /* ok to use deprecated addresses? */
1917                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1918                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1919                                 /* skip unspecifed addresses */
1920                                 return (0);
1921                         }
1922                         if (    /* (local_scope == 0) && */
1923                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                         if ((site_scope == 0) &&
1927                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1928                                 return (0);
1929                         }
1930                 } else {
1931                         return (0);
1932                 }
1933                 break;
1934 #endif
1935         default:
1936                 return (0);
1937         }
1938         return (1);
1939 }
1940
1941 static struct mbuf *
1942 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1943 {
1944         struct sctp_paramhdr *parmh;
1945         struct mbuf *mret;
1946         int len;
1947
1948         if (ifa->address.sa.sa_family == AF_INET) {
1949                 len = sizeof(struct sctp_ipv4addr_param);
1950         } else if (ifa->address.sa.sa_family == AF_INET6) {
1951                 len = sizeof(struct sctp_ipv6addr_param);
1952         } else {
1953                 /* unknown type */
1954                 return (m);
1955         }
1956         if (M_TRAILINGSPACE(m) >= len) {
1957                 /* easy side we just drop it on the end */
1958                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1959                 mret = m;
1960         } else {
1961                 /* Need more space */
1962                 mret = m;
1963                 while (SCTP_BUF_NEXT(mret) != NULL) {
1964                         mret = SCTP_BUF_NEXT(mret);
1965                 }
1966                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1967                 if (SCTP_BUF_NEXT(mret) == NULL) {
1968                         /* We are hosed, can't add more addresses */
1969                         return (m);
1970                 }
1971                 mret = SCTP_BUF_NEXT(mret);
1972                 parmh = mtod(mret, struct sctp_paramhdr *);
1973         }
1974         /* now add the parameter */
1975         switch (ifa->address.sa.sa_family) {
1976         case AF_INET:
1977                 {
1978                         struct sctp_ipv4addr_param *ipv4p;
1979                         struct sockaddr_in *sin;
1980
1981                         sin = (struct sockaddr_in *)&ifa->address.sin;
1982                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1983                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1984                         parmh->param_length = htons(len);
1985                         ipv4p->addr = sin->sin_addr.s_addr;
1986                         SCTP_BUF_LEN(mret) += len;
1987                         break;
1988                 }
1989 #ifdef INET6
1990         case AF_INET6:
1991                 {
1992                         struct sctp_ipv6addr_param *ipv6p;
1993                         struct sockaddr_in6 *sin6;
1994
1995                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1996                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
1997                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
1998                         parmh->param_length = htons(len);
1999                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2000                             sizeof(ipv6p->addr));
2001                         /* clear embedded scope in the address */
2002                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2003                         SCTP_BUF_LEN(mret) += len;
2004                         break;
2005                 }
2006 #endif
2007         default:
2008                 return (m);
2009         }
2010         return (mret);
2011 }
2012
2013
2014 struct mbuf *
2015 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
2016     struct mbuf *m_at, int cnt_inits_to)
2017 {
2018         struct sctp_vrf *vrf = NULL;
2019         int cnt, limit_out = 0, total_count;
2020         uint32_t vrf_id;
2021
2022         vrf_id = inp->def_vrf_id;
2023         SCTP_IPI_ADDR_RLOCK();
2024         vrf = sctp_find_vrf(vrf_id);
2025         if (vrf == NULL) {
2026                 SCTP_IPI_ADDR_RUNLOCK();
2027                 return (m_at);
2028         }
2029         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2030                 struct sctp_ifa *sctp_ifap;
2031                 struct sctp_ifn *sctp_ifnp;
2032
2033                 cnt = cnt_inits_to;
2034                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2035                         limit_out = 1;
2036                         cnt = SCTP_ADDRESS_LIMIT;
2037                         goto skip_count;
2038                 }
2039                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2040                         if ((scope->loopback_scope == 0) &&
2041                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2042                                 /*
2043                                  * Skip loopback devices if loopback_scope
2044                                  * not set
2045                                  */
2046                                 continue;
2047                         }
2048                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2049                                 if (sctp_is_address_in_scope(sctp_ifap,
2050                                     scope->ipv4_addr_legal,
2051                                     scope->ipv6_addr_legal,
2052                                     scope->loopback_scope,
2053                                     scope->ipv4_local_scope,
2054                                     scope->local_scope,
2055                                     scope->site_scope, 1) == 0) {
2056                                         continue;
2057                                 }
2058                                 cnt++;
2059                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2060                                         break;
2061                                 }
2062                         }
2063                         if (cnt > SCTP_ADDRESS_LIMIT) {
2064                                 break;
2065                         }
2066                 }
2067 skip_count:
2068                 if (cnt > 1) {
2069                         total_count = 0;
2070                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2071                                 cnt = 0;
2072                                 if ((scope->loopback_scope == 0) &&
2073                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2074                                         /*
2075                                          * Skip loopback devices if
2076                                          * loopback_scope not set
2077                                          */
2078                                         continue;
2079                                 }
2080                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2081                                         if (sctp_is_address_in_scope(sctp_ifap,
2082                                             scope->ipv4_addr_legal,
2083                                             scope->ipv6_addr_legal,
2084                                             scope->loopback_scope,
2085                                             scope->ipv4_local_scope,
2086                                             scope->local_scope,
2087                                             scope->site_scope, 0) == 0) {
2088                                                 continue;
2089                                         }
2090                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2091                                         if (limit_out) {
2092                                                 cnt++;
2093                                                 total_count++;
2094                                                 if (cnt >= 2) {
2095                                                         /*
2096                                                          * two from each
2097                                                          * address
2098                                                          */
2099                                                         break;
2100                                                 }
2101                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2102                                                         /* No more addresses */
2103                                                         break;
2104                                                 }
2105                                         }
2106                                 }
2107                         }
2108                 }
2109         } else {
2110                 struct sctp_laddr *laddr;
2111
2112                 cnt = cnt_inits_to;
2113                 /* First, how many ? */
2114                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2115                         if (laddr->ifa == NULL) {
2116                                 continue;
2117                         }
2118                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2119                                 /*
2120                                  * Address being deleted by the system, dont
2121                                  * list.
2122                                  */
2123                                 continue;
2124                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2125                                 /*
2126                                  * Address being deleted on this ep don't
2127                                  * list.
2128                                  */
2129                                 continue;
2130                         }
2131                         if (sctp_is_address_in_scope(laddr->ifa,
2132                             scope->ipv4_addr_legal,
2133                             scope->ipv6_addr_legal,
2134                             scope->loopback_scope,
2135                             scope->ipv4_local_scope,
2136                             scope->local_scope,
2137                             scope->site_scope, 1) == 0) {
2138                                 continue;
2139                         }
2140                         cnt++;
2141                 }
2142                 if (cnt > SCTP_ADDRESS_LIMIT) {
2143                         limit_out = 1;
2144                 }
2145                 /*
2146                  * To get through a NAT we only list addresses if we have
2147                  * more than one. That way if you just bind a single address
2148                  * we let the source of the init dictate our address.
2149                  */
2150                 if (cnt > 1) {
2151                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2152                                 cnt = 0;
2153                                 if (laddr->ifa == NULL) {
2154                                         continue;
2155                                 }
2156                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2157                                         continue;
2158
2159                                 if (sctp_is_address_in_scope(laddr->ifa,
2160                                     scope->ipv4_addr_legal,
2161                                     scope->ipv6_addr_legal,
2162                                     scope->loopback_scope,
2163                                     scope->ipv4_local_scope,
2164                                     scope->local_scope,
2165                                     scope->site_scope, 0) == 0) {
2166                                         continue;
2167                                 }
2168                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2169                                 cnt++;
2170                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2171                                         break;
2172                                 }
2173                         }
2174                 }
2175         }
2176         SCTP_IPI_ADDR_RUNLOCK();
2177         return (m_at);
2178 }
2179
2180 static struct sctp_ifa *
2181 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2182     uint8_t dest_is_loop,
2183     uint8_t dest_is_priv,
2184     sa_family_t fam)
2185 {
2186         uint8_t dest_is_global = 0;
2187
2188         /* dest_is_priv is true if destination is a private address */
2189         /* dest_is_loop is true if destination is a loopback addresses */
2190
2191         /**
2192          * Here we determine if its a preferred address. A preferred address
2193          * means it is the same scope or higher scope then the destination.
2194          * L = loopback, P = private, G = global
2195          * -----------------------------------------
2196          *    src    |  dest | result
2197          *  ----------------------------------------
2198          *     L     |    L  |    yes
2199          *  -----------------------------------------
2200          *     P     |    L  |    yes-v4 no-v6
2201          *  -----------------------------------------
2202          *     G     |    L  |    yes-v4 no-v6
2203          *  -----------------------------------------
2204          *     L     |    P  |    no
2205          *  -----------------------------------------
2206          *     P     |    P  |    yes
2207          *  -----------------------------------------
2208          *     G     |    P  |    no
2209          *   -----------------------------------------
2210          *     L     |    G  |    no
2211          *   -----------------------------------------
2212          *     P     |    G  |    no
2213          *    -----------------------------------------
2214          *     G     |    G  |    yes
2215          *    -----------------------------------------
2216          */
2217
2218         if (ifa->address.sa.sa_family != fam) {
2219                 /* forget mis-matched family */
2220                 return (NULL);
2221         }
2222         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2223                 dest_is_global = 1;
2224         }
2225         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2226         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2227         /* Ok the address may be ok */
2228         if (fam == AF_INET6) {
2229                 /* ok to use deprecated addresses? no lets not! */
2230                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2231                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2232                         return (NULL);
2233                 }
2234                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2235                         if (dest_is_loop) {
2236                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2237                                 return (NULL);
2238                         }
2239                 }
2240                 if (ifa->src_is_glob) {
2241                         if (dest_is_loop) {
2242                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2243                                 return (NULL);
2244                         }
2245                 }
2246         }
2247         /*
2248          * Now that we know what is what, implement or table this could in
2249          * theory be done slicker (it used to be), but this is
2250          * straightforward and easier to validate :-)
2251          */
2252         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2253             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2254         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2255             dest_is_loop, dest_is_priv, dest_is_global);
2256
2257         if ((ifa->src_is_loop) && (dest_is_priv)) {
2258                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2259                 return (NULL);
2260         }
2261         if ((ifa->src_is_glob) && (dest_is_priv)) {
2262                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2263                 return (NULL);
2264         }
2265         if ((ifa->src_is_loop) && (dest_is_global)) {
2266                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2267                 return (NULL);
2268         }
2269         if ((ifa->src_is_priv) && (dest_is_global)) {
2270                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2271                 return (NULL);
2272         }
2273         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2274         /* its a preferred address */
2275         return (ifa);
2276 }
2277
2278 static struct sctp_ifa *
2279 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2280     uint8_t dest_is_loop,
2281     uint8_t dest_is_priv,
2282     sa_family_t fam)
2283 {
2284         uint8_t dest_is_global = 0;
2285
2286         /*
2287          * Here we determine if its a acceptable address. A acceptable
2288          * address means it is the same scope or higher scope but we can
2289          * allow for NAT which means its ok to have a global dest and a
2290          * private src.
2291          *
2292          * L = loopback, P = private, G = global
2293          * ----------------------------------------- src    |  dest | result
2294          * ----------------------------------------- L     |   L   |    yes
2295          * ----------------------------------------- P     |   L   |
2296          * yes-v4 no-v6 ----------------------------------------- G     |
2297          * L   |    yes ----------------------------------------- L     |
2298          * P   |    no ----------------------------------------- P     |   P
2299          * |    yes ----------------------------------------- G     |   P
2300          * |    yes - May not work -----------------------------------------
2301          * L     |   G   |    no ----------------------------------------- P
2302          * |   G   |    yes - May not work
2303          * ----------------------------------------- G     |   G   |    yes
2304          * -----------------------------------------
2305          */
2306
2307         if (ifa->address.sa.sa_family != fam) {
2308                 /* forget non matching family */
2309                 return (NULL);
2310         }
2311         /* Ok the address may be ok */
2312         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2313                 dest_is_global = 1;
2314         }
2315         if (fam == AF_INET6) {
2316                 /* ok to use deprecated addresses? */
2317                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2318                         return (NULL);
2319                 }
2320                 if (ifa->src_is_priv) {
2321                         /* Special case, linklocal to loop */
2322                         if (dest_is_loop)
2323                                 return (NULL);
2324                 }
2325         }
2326         /*
2327          * Now that we know what is what, implement our table. This could in
2328          * theory be done slicker (it used to be), but this is
2329          * straightforward and easier to validate :-)
2330          */
2331         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2332                 return (NULL);
2333         }
2334         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2335                 return (NULL);
2336         }
2337         /* its an acceptable address */
2338         return (ifa);
2339 }
2340
2341 int
2342 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2343 {
2344         struct sctp_laddr *laddr;
2345
2346         if (stcb == NULL) {
2347                 /* There are no restrictions, no TCB :-) */
2348                 return (0);
2349         }
2350         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2351                 if (laddr->ifa == NULL) {
2352                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2353                             __FUNCTION__);
2354                         continue;
2355                 }
2356                 if (laddr->ifa == ifa) {
2357                         /* Yes it is on the list */
2358                         return (1);
2359                 }
2360         }
2361         return (0);
2362 }
2363
2364
2365 int
2366 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2367 {
2368         struct sctp_laddr *laddr;
2369
2370         if (ifa == NULL)
2371                 return (0);
2372         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2373                 if (laddr->ifa == NULL) {
2374                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2375                             __FUNCTION__);
2376                         continue;
2377                 }
2378                 if ((laddr->ifa == ifa) && laddr->action == 0)
2379                         /* same pointer */
2380                         return (1);
2381         }
2382         return (0);
2383 }
2384
2385
2386
2387 static struct sctp_ifa *
2388 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2389     sctp_route_t * ro,
2390     uint32_t vrf_id,
2391     int non_asoc_addr_ok,
2392     uint8_t dest_is_priv,
2393     uint8_t dest_is_loop,
2394     sa_family_t fam)
2395 {
2396         struct sctp_laddr *laddr, *starting_point;
2397         void *ifn;
2398         int resettotop = 0;
2399         struct sctp_ifn *sctp_ifn;
2400         struct sctp_ifa *sctp_ifa, *sifa;
2401         struct sctp_vrf *vrf;
2402         uint32_t ifn_index;
2403
2404         vrf = sctp_find_vrf(vrf_id);
2405         if (vrf == NULL)
2406                 return (NULL);
2407
2408         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2409         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2410         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2411         /*
2412          * first question, is the ifn we will emit on in our list, if so, we
2413          * want such an address. Note that we first looked for a preferred
2414          * address.
2415          */
2416         if (sctp_ifn) {
2417                 /* is a preferred one on the interface we route out? */
2418                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2419                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2420                             (non_asoc_addr_ok == 0))
2421                                 continue;
2422                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2423                             dest_is_loop,
2424                             dest_is_priv, fam);
2425                         if (sifa == NULL)
2426                                 continue;
2427                         if (sctp_is_addr_in_ep(inp, sifa)) {
2428                                 atomic_add_int(&sifa->refcount, 1);
2429                                 return (sifa);
2430                         }
2431                 }
2432         }
2433         /*
2434          * ok, now we now need to find one on the list of the addresses. We
2435          * can't get one on the emitting interface so let's find first a
2436          * preferred one. If not that an acceptable one otherwise... we
2437          * return NULL.
2438          */
2439         starting_point = inp->next_addr_touse;
2440 once_again:
2441         if (inp->next_addr_touse == NULL) {
2442                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2443                 resettotop = 1;
2444         }
2445         for (laddr = inp->next_addr_touse; laddr;
2446             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2447                 if (laddr->ifa == NULL) {
2448                         /* address has been removed */
2449                         continue;
2450                 }
2451                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2452                         /* address is being deleted */
2453                         continue;
2454                 }
2455                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2456                     dest_is_priv, fam);
2457                 if (sifa == NULL)
2458                         continue;
2459                 atomic_add_int(&sifa->refcount, 1);
2460                 return (sifa);
2461         }
2462         if (resettotop == 0) {
2463                 inp->next_addr_touse = NULL;
2464                 goto once_again;
2465         }
2466         inp->next_addr_touse = starting_point;
2467         resettotop = 0;
2468 once_again_too:
2469         if (inp->next_addr_touse == NULL) {
2470                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2471                 resettotop = 1;
2472         }
2473         /* ok, what about an acceptable address in the inp */
2474         for (laddr = inp->next_addr_touse; laddr;
2475             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2476                 if (laddr->ifa == NULL) {
2477                         /* address has been removed */
2478                         continue;
2479                 }
2480                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2481                         /* address is being deleted */
2482                         continue;
2483                 }
2484                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2485                     dest_is_priv, fam);
2486                 if (sifa == NULL)
2487                         continue;
2488                 atomic_add_int(&sifa->refcount, 1);
2489                 return (sifa);
2490         }
2491         if (resettotop == 0) {
2492                 inp->next_addr_touse = NULL;
2493                 goto once_again_too;
2494         }
2495         /*
2496          * no address bound can be a source for the destination we are in
2497          * trouble
2498          */
2499         return (NULL);
2500 }
2501
2502
2503
2504 static struct sctp_ifa *
2505 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2506     struct sctp_tcb *stcb,
2507     struct sctp_nets *net,
2508     sctp_route_t * ro,
2509     uint32_t vrf_id,
2510     uint8_t dest_is_priv,
2511     uint8_t dest_is_loop,
2512     int non_asoc_addr_ok,
2513     sa_family_t fam)
2514 {
2515         struct sctp_laddr *laddr, *starting_point;
2516         void *ifn;
2517         struct sctp_ifn *sctp_ifn;
2518         struct sctp_ifa *sctp_ifa, *sifa;
2519         uint8_t start_at_beginning = 0;
2520         struct sctp_vrf *vrf;
2521         uint32_t ifn_index;
2522
2523         /*
2524          * first question, is the ifn we will emit on in our list, if so, we
2525          * want that one.
2526          */
2527         vrf = sctp_find_vrf(vrf_id);
2528         if (vrf == NULL)
2529                 return (NULL);
2530
2531         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2532         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2533         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2534
2535         /*
2536          * first question, is the ifn we will emit on in our list?  If so,
2537          * we want that one. First we look for a preferred. Second, we go
2538          * for an acceptable.
2539          */
2540         if (sctp_ifn) {
2541                 /* first try for a preferred address on the ep */
2542                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2543                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2544                                 continue;
2545                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2546                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2547                                 if (sifa == NULL)
2548                                         continue;
2549                                 if (((non_asoc_addr_ok == 0) &&
2550                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2551                                     (non_asoc_addr_ok &&
2552                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2553                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2554                                         /* on the no-no list */
2555                                         continue;
2556                                 }
2557                                 atomic_add_int(&sifa->refcount, 1);
2558                                 return (sifa);
2559                         }
2560                 }
2561                 /* next try for an acceptable address on the ep */
2562                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2563                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2564                                 continue;
2565                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2566                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2567                                 if (sifa == NULL)
2568                                         continue;
2569                                 if (((non_asoc_addr_ok == 0) &&
2570                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2571                                     (non_asoc_addr_ok &&
2572                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2573                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2574                                         /* on the no-no list */
2575                                         continue;
2576                                 }
2577                                 atomic_add_int(&sifa->refcount, 1);
2578                                 return (sifa);
2579                         }
2580                 }
2581
2582         }
2583         /*
2584          * if we can't find one like that then we must look at all addresses
2585          * bound to pick one at first preferable then secondly acceptable.
2586          */
2587         starting_point = stcb->asoc.last_used_address;
2588 sctp_from_the_top:
2589         if (stcb->asoc.last_used_address == NULL) {
2590                 start_at_beginning = 1;
2591                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2592         }
2593         /* search beginning with the last used address */
2594         for (laddr = stcb->asoc.last_used_address; laddr;
2595             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2596                 if (laddr->ifa == NULL) {
2597                         /* address has been removed */
2598                         continue;
2599                 }
2600                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2601                         /* address is being deleted */
2602                         continue;
2603                 }
2604                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2605                 if (sifa == NULL)
2606                         continue;
2607                 if (((non_asoc_addr_ok == 0) &&
2608                     (sctp_is_addr_restricted(stcb, sifa))) ||
2609                     (non_asoc_addr_ok &&
2610                     (sctp_is_addr_restricted(stcb, sifa)) &&
2611                     (!sctp_is_addr_pending(stcb, sifa)))) {
2612                         /* on the no-no list */
2613                         continue;
2614                 }
2615                 stcb->asoc.last_used_address = laddr;
2616                 atomic_add_int(&sifa->refcount, 1);
2617                 return (sifa);
2618         }
2619         if (start_at_beginning == 0) {
2620                 stcb->asoc.last_used_address = NULL;
2621                 goto sctp_from_the_top;
2622         }
2623         /* now try for any higher scope than the destination */
2624         stcb->asoc.last_used_address = starting_point;
2625         start_at_beginning = 0;
2626 sctp_from_the_top2:
2627         if (stcb->asoc.last_used_address == NULL) {
2628                 start_at_beginning = 1;
2629                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2630         }
2631         /* search beginning with the last used address */
2632         for (laddr = stcb->asoc.last_used_address; laddr;
2633             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2634                 if (laddr->ifa == NULL) {
2635                         /* address has been removed */
2636                         continue;
2637                 }
2638                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2639                         /* address is being deleted */
2640                         continue;
2641                 }
2642                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2643                     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_top2;
2661         }
2662         return (NULL);
2663 }
2664
2665 static struct sctp_ifa *
2666 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2667     struct sctp_tcb *stcb,
2668     int non_asoc_addr_ok,
2669     uint8_t dest_is_loop,
2670     uint8_t dest_is_priv,
2671     int addr_wanted,
2672     sa_family_t fam,
2673     sctp_route_t * ro
2674 )
2675 {
2676         struct sctp_ifa *ifa, *sifa;
2677         int num_eligible_addr = 0;
2678
2679 #ifdef INET6
2680         struct sockaddr_in6 sin6, lsa6;
2681
2682         if (fam == AF_INET6) {
2683                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2684                 (void)sa6_recoverscope(&sin6);
2685         }
2686 #endif                          /* INET6 */
2687         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2688                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2689                     (non_asoc_addr_ok == 0))
2690                         continue;
2691                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2692                     dest_is_priv, fam);
2693                 if (sifa == NULL)
2694                         continue;
2695 #ifdef INET6
2696                 if (fam == AF_INET6 &&
2697                     dest_is_loop &&
2698                     sifa->src_is_loop && sifa->src_is_priv) {
2699                         /*
2700                          * don't allow fe80::1 to be a src on loop ::1, we
2701                          * don't list it to the peer so we will get an
2702                          * abort.
2703                          */
2704                         continue;
2705                 }
2706                 if (fam == AF_INET6 &&
2707                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2708                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2709                         /*
2710                          * link-local <-> link-local must belong to the same
2711                          * scope.
2712                          */
2713                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2714                         (void)sa6_recoverscope(&lsa6);
2715                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2716                                 continue;
2717                         }
2718                 }
2719 #endif                          /* INET6 */
2720
2721                 /*
2722                  * Check if the IPv6 address matches to next-hop. In the
2723                  * mobile case, old IPv6 address may be not deleted from the
2724                  * interface. Then, the interface has previous and new
2725                  * addresses.  We should use one corresponding to the
2726                  * next-hop.  (by micchie)
2727                  */
2728 #ifdef INET6
2729                 if (stcb && fam == AF_INET6 &&
2730                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2731                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2732                             == 0) {
2733                                 continue;
2734                         }
2735                 }
2736 #endif
2737                 /* Avoid topologically incorrect IPv4 address */
2738                 if (stcb && fam == AF_INET &&
2739                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2740                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2741                                 continue;
2742                         }
2743                 }
2744                 if (stcb) {
2745                         if (sctp_is_address_in_scope(ifa,
2746                             stcb->asoc.ipv4_addr_legal,
2747                             stcb->asoc.ipv6_addr_legal,
2748                             stcb->asoc.loopback_scope,
2749                             stcb->asoc.ipv4_local_scope,
2750                             stcb->asoc.local_scope,
2751                             stcb->asoc.site_scope, 0) == 0) {
2752                                 continue;
2753                         }
2754                         if (((non_asoc_addr_ok == 0) &&
2755                             (sctp_is_addr_restricted(stcb, sifa))) ||
2756                             (non_asoc_addr_ok &&
2757                             (sctp_is_addr_restricted(stcb, sifa)) &&
2758                             (!sctp_is_addr_pending(stcb, sifa)))) {
2759                                 /*
2760                                  * It is restricted for some reason..
2761                                  * probably not yet added.
2762                                  */
2763                                 continue;
2764                         }
2765                 }
2766                 if (num_eligible_addr >= addr_wanted) {
2767                         return (sifa);
2768                 }
2769                 num_eligible_addr++;
2770         }
2771         return (NULL);
2772 }
2773
2774
2775 static int
2776 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2777     struct sctp_tcb *stcb,
2778     int non_asoc_addr_ok,
2779     uint8_t dest_is_loop,
2780     uint8_t dest_is_priv,
2781     sa_family_t fam)
2782 {
2783         struct sctp_ifa *ifa, *sifa;
2784         int num_eligible_addr = 0;
2785
2786         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2787                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2788                     (non_asoc_addr_ok == 0)) {
2789                         continue;
2790                 }
2791                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2792                     dest_is_priv, fam);
2793                 if (sifa == NULL) {
2794                         continue;
2795                 }
2796                 if (stcb) {
2797                         if (sctp_is_address_in_scope(ifa,
2798                             stcb->asoc.ipv4_addr_legal,
2799                             stcb->asoc.ipv6_addr_legal,
2800                             stcb->asoc.loopback_scope,
2801                             stcb->asoc.ipv4_local_scope,
2802                             stcb->asoc.local_scope,
2803                             stcb->asoc.site_scope, 0) == 0) {
2804                                 continue;
2805                         }
2806                         if (((non_asoc_addr_ok == 0) &&
2807                             (sctp_is_addr_restricted(stcb, sifa))) ||
2808                             (non_asoc_addr_ok &&
2809                             (sctp_is_addr_restricted(stcb, sifa)) &&
2810                             (!sctp_is_addr_pending(stcb, sifa)))) {
2811                                 /*
2812                                  * It is restricted for some reason..
2813                                  * probably not yet added.
2814                                  */
2815                                 continue;
2816                         }
2817                 }
2818                 num_eligible_addr++;
2819         }
2820         return (num_eligible_addr);
2821 }
2822
2823 static struct sctp_ifa *
2824 sctp_choose_boundall(struct sctp_inpcb *inp,
2825     struct sctp_tcb *stcb,
2826     struct sctp_nets *net,
2827     sctp_route_t * ro,
2828     uint32_t vrf_id,
2829     uint8_t dest_is_priv,
2830     uint8_t dest_is_loop,
2831     int non_asoc_addr_ok,
2832     sa_family_t fam)
2833 {
2834         int cur_addr_num = 0, num_preferred = 0;
2835         void *ifn;
2836         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2837         struct sctp_ifa *sctp_ifa, *sifa;
2838         uint32_t ifn_index;
2839         struct sctp_vrf *vrf;
2840
2841         /*-
2842          * For boundall we can use any address in the association.
2843          * If non_asoc_addr_ok is set we can use any address (at least in
2844          * theory). So we look for preferred addresses first. If we find one,
2845          * we use it. Otherwise we next try to get an address on the
2846          * interface, which we should be able to do (unless non_asoc_addr_ok
2847          * is false and we are routed out that way). In these cases where we
2848          * can't use the address of the interface we go through all the
2849          * ifn's looking for an address we can use and fill that in. Punting
2850          * means we send back address 0, which will probably cause problems
2851          * actually since then IP will fill in the address of the route ifn,
2852          * which means we probably already rejected it.. i.e. here comes an
2853          * abort :-<.
2854          */
2855         vrf = sctp_find_vrf(vrf_id);
2856         if (vrf == NULL)
2857                 return (NULL);
2858
2859         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2860         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2861         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2862         if (sctp_ifn == NULL) {
2863                 /* ?? We don't have this guy ?? */
2864                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2865                 goto bound_all_plan_b;
2866         }
2867         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2868             ifn_index, sctp_ifn->ifn_name);
2869
2870         if (net) {
2871                 cur_addr_num = net->indx_of_eligible_next_to_use;
2872         }
2873         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2874             stcb,
2875             non_asoc_addr_ok,
2876             dest_is_loop,
2877             dest_is_priv, fam);
2878         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2879             num_preferred, sctp_ifn->ifn_name);
2880         if (num_preferred == 0) {
2881                 /*
2882                  * no eligible addresses, we must use some other interface
2883                  * address if we can find one.
2884                  */
2885                 goto bound_all_plan_b;
2886         }
2887         /*
2888          * Ok we have num_eligible_addr set with how many we can use, this
2889          * may vary from call to call due to addresses being deprecated
2890          * etc..
2891          */
2892         if (cur_addr_num >= num_preferred) {
2893                 cur_addr_num = 0;
2894         }
2895         /*
2896          * select the nth address from the list (where cur_addr_num is the
2897          * nth) and 0 is the first one, 1 is the second one etc...
2898          */
2899         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2900
2901         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2902             dest_is_priv, cur_addr_num, fam, ro);
2903
2904         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2905         if (sctp_ifa) {
2906                 atomic_add_int(&sctp_ifa->refcount, 1);
2907                 if (net) {
2908                         /* save off where the next one we will want */
2909                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2910                 }
2911                 return (sctp_ifa);
2912         }
2913         /*
2914          * plan_b: Look at all interfaces and find a preferred address. If
2915          * no preferred fall through to plan_c.
2916          */
2917 bound_all_plan_b:
2918         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2919         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2920                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2921                     sctp_ifn->ifn_name);
2922                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2923                         /* wrong base scope */
2924                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2925                         continue;
2926                 }
2927                 if ((sctp_ifn == looked_at) && looked_at) {
2928                         /* already looked at this guy */
2929                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2930                         continue;
2931                 }
2932                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2933                     dest_is_loop, dest_is_priv, fam);
2934                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2935                     "Found ifn:%p %d preferred source addresses\n",
2936                     ifn, num_preferred);
2937                 if (num_preferred == 0) {
2938                         /* None on this interface. */
2939                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2940                         continue;
2941                 }
2942                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2943                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2944                     num_preferred, sctp_ifn, cur_addr_num);
2945
2946                 /*
2947                  * Ok we have num_eligible_addr set with how many we can
2948                  * use, this may vary from call to call due to addresses
2949                  * being deprecated etc..
2950                  */
2951                 if (cur_addr_num >= num_preferred) {
2952                         cur_addr_num = 0;
2953                 }
2954                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2955                     dest_is_priv, cur_addr_num, fam, ro);
2956                 if (sifa == NULL)
2957                         continue;
2958                 if (net) {
2959                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2960                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2961                             cur_addr_num);
2962                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2963                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2964                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2965                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2966                 }
2967                 atomic_add_int(&sifa->refcount, 1);
2968                 return (sifa);
2969
2970         }
2971
2972         /* plan_c: do we have an acceptable address on the emit interface */
2973         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
2974         if (emit_ifn == NULL) {
2975                 goto plan_d;
2976         }
2977         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
2978                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2979                     (non_asoc_addr_ok == 0))
2980                         continue;
2981                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
2982                     dest_is_priv, fam);
2983                 if (sifa == NULL)
2984                         continue;
2985                 if (stcb) {
2986                         if (sctp_is_address_in_scope(sifa,
2987                             stcb->asoc.ipv4_addr_legal,
2988                             stcb->asoc.ipv6_addr_legal,
2989                             stcb->asoc.loopback_scope,
2990                             stcb->asoc.ipv4_local_scope,
2991                             stcb->asoc.local_scope,
2992                             stcb->asoc.site_scope, 0) == 0) {
2993                                 continue;
2994                         }
2995                         if (((non_asoc_addr_ok == 0) &&
2996                             (sctp_is_addr_restricted(stcb, sifa))) ||
2997                             (non_asoc_addr_ok &&
2998                             (sctp_is_addr_restricted(stcb, sifa)) &&
2999                             (!sctp_is_addr_pending(stcb, sifa)))) {
3000                                 /*
3001                                  * It is restricted for some reason..
3002                                  * probably not yet added.
3003                                  */
3004                                 continue;
3005                         }
3006                 }
3007                 atomic_add_int(&sifa->refcount, 1);
3008                 return (sifa);
3009         }
3010 plan_d:
3011         /*
3012          * plan_d: We are in trouble. No preferred address on the emit
3013          * interface. And not even a preferred address on all interfaces. Go
3014          * out and see if we can find an acceptable address somewhere
3015          * amongst all interfaces.
3016          */
3017         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
3018         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3019                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3020                         /* wrong base scope */
3021                         continue;
3022                 }
3023                 if ((sctp_ifn == looked_at) && looked_at)
3024                         /* already looked at this guy */
3025                         continue;
3026
3027                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3028                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3029                             (non_asoc_addr_ok == 0))
3030                                 continue;
3031                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3032                             dest_is_loop,
3033                             dest_is_priv, fam);
3034                         if (sifa == NULL)
3035                                 continue;
3036                         if (stcb) {
3037                                 if (sctp_is_address_in_scope(sifa,
3038                                     stcb->asoc.ipv4_addr_legal,
3039                                     stcb->asoc.ipv6_addr_legal,
3040                                     stcb->asoc.loopback_scope,
3041                                     stcb->asoc.ipv4_local_scope,
3042                                     stcb->asoc.local_scope,
3043                                     stcb->asoc.site_scope, 0) == 0) {
3044                                         continue;
3045                                 }
3046                                 if (((non_asoc_addr_ok == 0) &&
3047                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3048                                     (non_asoc_addr_ok &&
3049                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3050                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3051                                         /*
3052                                          * It is restricted for some
3053                                          * reason.. probably not yet added.
3054                                          */
3055                                         continue;
3056                                 }
3057                         }
3058                         atomic_add_int(&sifa->refcount, 1);
3059                         return (sifa);
3060                 }
3061         }
3062         /*
3063          * Ok we can find NO address to source from that is not on our
3064          * restricted list and non_asoc_address is NOT ok, or it is on our
3065          * restricted list. We can't source to it :-(
3066          */
3067         return (NULL);
3068 }
3069
3070
3071
3072 /* tcb may be NULL */
3073 struct sctp_ifa *
3074 sctp_source_address_selection(struct sctp_inpcb *inp,
3075     struct sctp_tcb *stcb,
3076     sctp_route_t * ro,
3077     struct sctp_nets *net,
3078     int non_asoc_addr_ok, uint32_t vrf_id)
3079 {
3080         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3081
3082 #ifdef INET6
3083         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3084
3085 #endif
3086         struct sctp_ifa *answer;
3087         uint8_t dest_is_priv, dest_is_loop;
3088         sa_family_t fam;
3089
3090         /*-
3091          * Rules: - Find the route if needed, cache if I can. - Look at
3092          * interface address in route, Is it in the bound list. If so we
3093          * have the best source. - If not we must rotate amongst the
3094          * addresses.
3095          *
3096          * Cavets and issues
3097          *
3098          * Do we need to pay attention to scope. We can have a private address
3099          * or a global address we are sourcing or sending to. So if we draw
3100          * it out
3101          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3102          * For V4
3103          * ------------------------------------------
3104          *      source     *      dest  *  result
3105          * -----------------------------------------
3106          * <a>  Private    *    Global  *  NAT
3107          * -----------------------------------------
3108          * <b>  Private    *    Private *  No problem
3109          * -----------------------------------------
3110          * <c>  Global     *    Private *  Huh, How will this work?
3111          * -----------------------------------------
3112          * <d>  Global     *    Global  *  No Problem
3113          *------------------------------------------
3114          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3115          * For V6
3116          *------------------------------------------
3117          *      source     *      dest  *  result
3118          * -----------------------------------------
3119          * <a>  Linklocal  *    Global  *
3120          * -----------------------------------------
3121          * <b>  Linklocal  * Linklocal  *  No problem
3122          * -----------------------------------------
3123          * <c>  Global     * Linklocal  *  Huh, How will this work?
3124          * -----------------------------------------
3125          * <d>  Global     *    Global  *  No Problem
3126          *------------------------------------------
3127          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3128          *
3129          * And then we add to that what happens if there are multiple addresses
3130          * assigned to an interface. Remember the ifa on a ifn is a linked
3131          * list of addresses. So one interface can have more than one IP
3132          * address. What happens if we have both a private and a global
3133          * address? Do we then use context of destination to sort out which
3134          * one is best? And what about NAT's sending P->G may get you a NAT
3135          * translation, or should you select the G thats on the interface in
3136          * preference.
3137          *
3138          * Decisions:
3139          *
3140          * - count the number of addresses on the interface.
3141          * - if it is one, no problem except case <c>.
3142          *   For <a> we will assume a NAT out there.
3143          * - if there are more than one, then we need to worry about scope P
3144          *   or G. We should prefer G -> G and P -> P if possible.
3145          *   Then as a secondary fall back to mixed types G->P being a last
3146          *   ditch one.
3147          * - The above all works for bound all, but bound specific we need to
3148          *   use the same concept but instead only consider the bound
3149          *   addresses. If the bound set is NOT assigned to the interface then
3150          *   we must use rotation amongst the bound addresses..
3151          */
3152         if (ro->ro_rt == NULL) {
3153                 /*
3154                  * Need a route to cache.
3155                  */
3156                 SCTP_RTALLOC(ro, vrf_id);
3157         }
3158         if (ro->ro_rt == NULL) {
3159                 return (NULL);
3160         }
3161         fam = to->sin_family;
3162         dest_is_priv = dest_is_loop = 0;
3163         /* Setup our scopes for the destination */
3164         switch (fam) {
3165         case AF_INET:
3166                 /* Scope based on outbound address */
3167                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3168                         dest_is_loop = 1;
3169                         if (net != NULL) {
3170                                 /* mark it as local */
3171                                 net->addr_is_local = 1;
3172                         }
3173                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3174                         dest_is_priv = 1;
3175                 }
3176                 break;
3177 #ifdef INET6
3178         case AF_INET6:
3179                 /* Scope based on outbound address */
3180                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3181                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3182                         /*
3183                          * If the address is a loopback address, which
3184                          * consists of "::1" OR "fe80::1%lo0", we are
3185                          * loopback scope. But we don't use dest_is_priv
3186                          * (link local addresses).
3187                          */
3188                         dest_is_loop = 1;
3189                         if (net != NULL) {
3190                                 /* mark it as local */
3191                                 net->addr_is_local = 1;
3192                         }
3193                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3194                         dest_is_priv = 1;
3195                 }
3196                 break;
3197 #endif
3198         }
3199         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3200         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
3201         SCTP_IPI_ADDR_RLOCK();
3202         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3203                 /*
3204                  * Bound all case
3205                  */
3206                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3207                     dest_is_priv, dest_is_loop,
3208                     non_asoc_addr_ok, fam);
3209                 SCTP_IPI_ADDR_RUNLOCK();
3210                 return (answer);
3211         }
3212         /*
3213          * Subset bound case
3214          */
3215         if (stcb) {
3216                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3217                     vrf_id, dest_is_priv,
3218                     dest_is_loop,
3219                     non_asoc_addr_ok, fam);
3220         } else {
3221                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3222                     non_asoc_addr_ok,
3223                     dest_is_priv,
3224                     dest_is_loop, fam);
3225         }
3226         SCTP_IPI_ADDR_RUNLOCK();
3227         return (answer);
3228 }
3229
3230 static int
3231 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
3232 {
3233         struct cmsghdr cmh;
3234         int tlen, at;
3235
3236         tlen = SCTP_BUF_LEN(control);
3237         at = 0;
3238         /*
3239          * Independent of how many mbufs, find the c_type inside the control
3240          * structure and copy out the data.
3241          */
3242         while (at < tlen) {
3243                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3244                         /* not enough room for one more we are done. */
3245                         return (0);
3246                 }
3247                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3248                 if (((int)cmh.cmsg_len + at) > tlen) {
3249                         /*
3250                          * this is real messed up since there is not enough
3251                          * data here to cover the cmsg header. We are done.
3252                          */
3253                         return (0);
3254                 }
3255                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3256                     (c_type == cmh.cmsg_type)) {
3257                         /* found the one we want, copy it out */
3258                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
3259                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3260                                 /*
3261                                  * space of cmsg_len after header not big
3262                                  * enough
3263                                  */
3264                                 return (0);
3265                         }
3266                         m_copydata(control, at, cpsize, data);
3267                         return (1);
3268                 } else {
3269                         at += CMSG_ALIGN(cmh.cmsg_len);
3270                         if (cmh.cmsg_len == 0) {
3271                                 break;
3272                         }
3273                 }
3274         }
3275         /* not found */
3276         return (0);
3277 }
3278
3279 static struct mbuf *
3280 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3281     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3282 {
3283         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3284         struct sctp_state_cookie *stc;
3285         struct sctp_paramhdr *ph;
3286         uint8_t *foo;
3287         int sig_offset;
3288         uint16_t cookie_sz;
3289
3290         mret = NULL;
3291         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3292             sizeof(struct sctp_paramhdr)), 0,
3293             M_DONTWAIT, 1, MT_DATA);
3294         if (mret == NULL) {
3295                 return (NULL);
3296         }
3297         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3298         if (copy_init == NULL) {
3299                 sctp_m_freem(mret);
3300                 return (NULL);
3301         }
3302 #ifdef SCTP_MBUF_LOGGING
3303         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3304                 struct mbuf *mat;
3305
3306                 mat = copy_init;
3307                 while (mat) {
3308                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3309                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3310                         }
3311                         mat = SCTP_BUF_NEXT(mat);
3312                 }
3313         }
3314 #endif
3315         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3316             M_DONTWAIT);
3317         if (copy_initack == NULL) {
3318                 sctp_m_freem(mret);
3319                 sctp_m_freem(copy_init);
3320                 return (NULL);
3321         }
3322 #ifdef SCTP_MBUF_LOGGING
3323         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3324                 struct mbuf *mat;
3325
3326                 mat = copy_initack;
3327                 while (mat) {
3328                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3329                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3330                         }
3331                         mat = SCTP_BUF_NEXT(mat);
3332                 }
3333         }
3334 #endif
3335         /* easy side we just drop it on the end */
3336         ph = mtod(mret, struct sctp_paramhdr *);
3337         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3338             sizeof(struct sctp_paramhdr);
3339         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3340             sizeof(struct sctp_paramhdr));
3341         ph->param_type = htons(SCTP_STATE_COOKIE);
3342         ph->param_length = 0;   /* fill in at the end */
3343         /* Fill in the stc cookie data */
3344         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3345
3346         /* tack the INIT and then the INIT-ACK onto the chain */
3347         cookie_sz = 0;
3348         m_at = mret;
3349         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3350                 cookie_sz += SCTP_BUF_LEN(m_at);
3351                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3352                         SCTP_BUF_NEXT(m_at) = copy_init;
3353                         break;
3354                 }
3355         }
3356
3357         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3358                 cookie_sz += SCTP_BUF_LEN(m_at);
3359                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3360                         SCTP_BUF_NEXT(m_at) = copy_initack;
3361                         break;
3362                 }
3363         }
3364
3365         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3366                 cookie_sz += SCTP_BUF_LEN(m_at);
3367                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3368                         break;
3369                 }
3370         }
3371         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3372         if (sig == NULL) {
3373                 /* no space, so free the entire chain */
3374                 sctp_m_freem(mret);
3375                 return (NULL);
3376         }
3377         SCTP_BUF_LEN(sig) = 0;
3378         SCTP_BUF_NEXT(m_at) = sig;
3379         sig_offset = 0;
3380         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3381         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3382         *signature = foo;
3383         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3384         cookie_sz += SCTP_SIGNATURE_SIZE;
3385         ph->param_length = htons(cookie_sz);
3386         return (mret);
3387 }
3388
3389
3390 static uint8_t
3391 sctp_get_ect(struct sctp_tcb *stcb,
3392     struct sctp_tmit_chunk *chk)
3393 {
3394         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3395                 return (SCTP_ECT0_BIT);
3396         } else {
3397                 return (0);
3398         }
3399 }
3400
3401 static int
3402 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3403     struct sctp_tcb *stcb,      /* may be NULL */
3404     struct sctp_nets *net,
3405     struct sockaddr *to,
3406     struct mbuf *m,
3407     uint32_t auth_offset,
3408     struct sctp_auth_chunk *auth,
3409     uint16_t auth_keyid,
3410     int nofragment_flag,
3411     int ecn_ok,
3412     struct sctp_tmit_chunk *chk,
3413     int out_of_asoc_ok,
3414     uint16_t src_port,
3415     uint16_t dest_port,
3416     uint32_t v_tag,
3417     uint16_t port,
3418     int so_locked,
3419 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3420     SCTP_UNUSED
3421 #endif
3422     union sctp_sockstore *over_addr,
3423     struct mbuf *init
3424 )
3425 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3426 {
3427         /*
3428          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
3429          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
3430          * structure: - fill in the HMAC digest of any AUTH chunk in the
3431          * packet. - calculate and fill in the SCTP checksum. - prepend an
3432          * IP address header. - if boundall use INADDR_ANY. - if
3433          * boundspecific do source address selection. - set fragmentation
3434          * option for ipV4. - On return from IP output, check/adjust mtu
3435          * size of output interface and smallest_mtu size as well.
3436          */
3437         /* Will need ifdefs around this */
3438         struct mbuf *o_pak;
3439         struct mbuf *newm;
3440         struct sctphdr *sctphdr;
3441         int packet_length;
3442         int ret;
3443         uint32_t vrf_id;
3444         sctp_route_t *ro = NULL;
3445         struct udphdr *udp = NULL;
3446
3447 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3448         struct socket *so = NULL;
3449
3450 #endif
3451
3452         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3453                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3454                 sctp_m_freem(m);
3455                 return (EFAULT);
3456         }
3457         if (stcb) {
3458                 vrf_id = stcb->asoc.vrf_id;
3459         } else {
3460                 vrf_id = inp->def_vrf_id;
3461         }
3462
3463         /* fill in the HMAC digest for any AUTH chunk in the packet */
3464         if ((auth != NULL) && (stcb != NULL)) {
3465                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3466         }
3467         if (to->sa_family == AF_INET) {
3468                 struct ip *ip = NULL;
3469                 sctp_route_t iproute;
3470                 uint8_t tos_value;
3471                 int len;
3472
3473                 len = sizeof(struct ip) + sizeof(struct sctphdr);
3474                 if (port) {
3475                         len += sizeof(struct udphdr);
3476                 }
3477                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3478                 if (newm == NULL) {
3479                         sctp_m_freem(m);
3480                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3481                         return (ENOMEM);
3482                 }
3483                 SCTP_ALIGN_TO_END(newm, len);
3484                 SCTP_BUF_LEN(newm) = len;
3485                 SCTP_BUF_NEXT(newm) = m;
3486                 m = newm;
3487                 if (net != NULL) {
3488 #ifdef INVARIANTS
3489                         if (net->flowidset == 0) {
3490                                 panic("Flow ID not set");
3491                         }
3492 #endif
3493                         m->m_pkthdr.flowid = net->flowid;
3494                         m->m_flags |= M_FLOWID;
3495                 } else {
3496                         if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3497                                 m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3498                                 m->m_flags |= M_FLOWID;
3499                         }
3500                 }
3501                 packet_length = sctp_calculate_len(m);
3502                 ip = mtod(m, struct ip *);
3503                 ip->ip_v = IPVERSION;
3504                 ip->ip_hl = (sizeof(struct ip) >> 2);
3505                 if (net) {
3506                         tos_value = net->tos_flowlabel & 0x000000ff;
3507                 } else {
3508                         tos_value = inp->ip_inp.inp.inp_ip_tos;
3509                 }
3510                 if ((nofragment_flag) && (port == 0)) {
3511                         ip->ip_off = IP_DF;
3512                 } else
3513                         ip->ip_off = 0;
3514
3515                 /* FreeBSD has a function for ip_id's */
3516                 ip->ip_id = ip_newid();
3517
3518                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3519                 ip->ip_len = packet_length;
3520                 ip->ip_tos = tos_value & 0xfc;
3521                 if (ecn_ok) {
3522                         ip->ip_tos |= sctp_get_ect(stcb, chk);
3523                 }
3524                 if (port) {
3525                         ip->ip_p = IPPROTO_UDP;
3526                 } else {
3527                         ip->ip_p = IPPROTO_SCTP;
3528                 }
3529                 ip->ip_sum = 0;
3530                 if (net == NULL) {
3531                         ro = &iproute;
3532                         memset(&iproute, 0, sizeof(iproute));
3533                         memcpy(&ro->ro_dst, to, to->sa_len);
3534                 } else {
3535                         ro = (sctp_route_t *) & net->ro;
3536                 }
3537                 /* Now the address selection part */
3538                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3539
3540                 /* call the routine to select the src address */
3541                 if (net && out_of_asoc_ok == 0) {
3542                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3543                                 sctp_free_ifa(net->ro._s_addr);
3544                                 net->ro._s_addr = NULL;
3545                                 net->src_addr_selected = 0;
3546                                 if (ro->ro_rt) {
3547                                         RTFREE(ro->ro_rt);
3548                                         ro->ro_rt = NULL;
3549                                 }
3550                         }
3551                         if (net->src_addr_selected == 0) {
3552                                 /* Cache the source address */
3553                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3554                                     ro, net, 0,
3555                                     vrf_id);
3556                                 net->src_addr_selected = 1;
3557                         }
3558                         if (net->ro._s_addr == NULL) {
3559                                 /* No route to host */
3560                                 net->src_addr_selected = 0;
3561                                 goto no_route;
3562                         }
3563                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
3564                 } else {
3565                         if (over_addr == NULL) {
3566                                 struct sctp_ifa *_lsrc;
3567
3568                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3569                                     net,
3570                                     out_of_asoc_ok,
3571                                     vrf_id);
3572                                 if (_lsrc == NULL) {
3573                                         goto no_route;
3574                                 }
3575                                 ip->ip_src = _lsrc->address.sin.sin_addr;
3576                                 sctp_free_ifa(_lsrc);
3577                         } else {
3578                                 ip->ip_src = over_addr->sin.sin_addr;
3579                                 SCTP_RTALLOC(ro, vrf_id);
3580                         }
3581                 }
3582                 if (port) {
3583                         udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
3584                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3585                         udp->uh_dport = port;
3586                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
3587                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
3588                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3589                 } else {
3590                         sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
3591                 }
3592
3593                 sctphdr->src_port = src_port;
3594                 sctphdr->dest_port = dest_port;
3595                 sctphdr->v_tag = v_tag;
3596                 sctphdr->checksum = 0;
3597
3598                 /*
3599                  * If source address selection fails and we find no route
3600                  * then the ip_output should fail as well with a
3601                  * NO_ROUTE_TO_HOST type error. We probably should catch
3602                  * that somewhere and abort the association right away
3603                  * (assuming this is an INIT being sent).
3604                  */
3605                 if ((ro->ro_rt == NULL)) {
3606                         /*
3607                          * src addr selection failed to find a route (or
3608                          * valid source addr), so we can't get there from
3609                          * here (yet)!
3610                          */
3611         no_route:
3612                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
3613                             "%s: dropped packet - no valid source addr\n",
3614                             __FUNCTION__);
3615                         if (net) {
3616                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
3617                                     "Destination was ");
3618                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
3619                                     &net->ro._l_addr.sa);
3620                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3621                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3622                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3623                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3624                                                     stcb,
3625                                                     SCTP_FAILED_THRESHOLD,
3626                                                     (void *)net,
3627                                                     so_locked);
3628                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3629                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
3630                                                 /*
3631                                                  * JRS 5/14/07 - If a
3632                                                  * destination is
3633                                                  * unreachable, the PF bit
3634                                                  * is turned off.  This
3635                                                  * allows an unambiguous use
3636                                                  * of the PF bit for
3637                                                  * destinations that are
3638                                                  * reachable but potentially
3639                                                  * failed. If the
3640                                                  * destination is set to the
3641                                                  * unreachable state, also
3642                                                  * set the destination to
3643                                                  * the PF state.
3644                                                  */
3645                                                 /*
3646                                                  * Add debug message here if
3647                                                  * destination is not in PF
3648                                                  * state.
3649                                                  */
3650                                                 /*
3651                                                  * Stop any running T3
3652                                                  * timers here?
3653                                                  */
3654                                                 if ((stcb->asoc.sctp_cmt_on_off > 0) &&
3655                                                     (stcb->asoc.sctp_cmt_pf > 0)) {
3656                                                         net->dest_state &= ~SCTP_ADDR_PF;
3657                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
3658                                                             net);
3659                                                 }
3660                                         }
3661                                 }
3662                                 if (stcb) {
3663                                         if (net == stcb->asoc.primary_destination) {
3664                                                 /* need a new primary */
3665                                                 struct sctp_nets *alt;
3666
3667                                                 alt = sctp_find_alternate_net(stcb, net, 0);
3668                                                 if (alt != net) {
3669                                                         if (sctp_set_primary_addr(stcb,
3670                                                             (struct sockaddr *)NULL,
3671                                                             alt) == 0) {
3672                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
3673                                                                 if (net->ro._s_addr) {
3674                                                                         sctp_free_ifa(net->ro._s_addr);
3675                                                                         net->ro._s_addr = NULL;
3676                                                                 }
3677                                                                 net->src_addr_selected = 0;
3678                                                         }
3679                                                 }
3680                                         }
3681                                 }
3682                         }
3683                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3684                         sctp_m_freem(m);
3685                         return (EHOSTUNREACH);
3686                 }
3687                 if (ro != &iproute) {
3688                         memcpy(&iproute, ro, sizeof(*ro));
3689                 }
3690                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
3691                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
3692                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
3693                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
3694                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
3695                     ro->ro_rt);
3696
3697                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
3698                         /* failed to prepend data, give up */
3699                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3700                         sctp_m_freem(m);
3701                         return (ENOMEM);
3702                 }
3703 #ifdef  SCTP_PACKET_LOGGING
3704                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
3705                         sctp_packet_log(m, packet_length);
3706 #endif
3707                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
3708                 if (port) {
3709 #if defined(SCTP_WITH_NO_CSUM)
3710                         SCTP_STAT_INCR(sctps_sendnocrc);
3711 #else
3712                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
3713                             (stcb) &&
3714                             (stcb->asoc.loopback_scope))) {
3715                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
3716                                 SCTP_STAT_INCR(sctps_sendswcrc);
3717                         } else {
3718                                 SCTP_STAT_INCR(sctps_sendnocrc);
3719                         }
3720 #endif
3721                         SCTP_ENABLE_UDP_CSUM(o_pak);
3722                 } else {
3723 #if defined(SCTP_WITH_NO_CSUM)
3724                         SCTP_STAT_INCR(sctps_sendnocrc);
3725 #else
3726                         m->m_pkthdr.csum_flags = CSUM_SCTP;
3727                         m->m_pkthdr.csum_data = 0;
3728                         SCTP_STAT_INCR(sctps_sendhwcrc);
3729 #endif
3730                 }
3731                 /* send it out.  table id is taken from stcb */
3732 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3733                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3734                         so = SCTP_INP_SO(inp);
3735                         SCTP_SOCKET_UNLOCK(so, 0);
3736                 }
3737 #endif
3738                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
3739 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3740                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
3741                         atomic_add_int(&stcb->asoc.refcnt, 1);
3742                         SCTP_TCB_UNLOCK(stcb);
3743                         SCTP_SOCKET_LOCK(so, 0);
3744                         SCTP_TCB_LOCK(stcb);
3745                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3746                 }
3747 #endif
3748                 SCTP_STAT_INCR(sctps_sendpackets);
3749                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
3750                 if (ret)
3751                         SCTP_STAT_INCR(sctps_senderrors);
3752
3753                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
3754                 if (net == NULL) {
3755                         /* free tempy routes */
3756                         if (ro->ro_rt) {
3757                                 RTFREE(ro->ro_rt);
3758                                 ro->ro_rt = NULL;
3759                         }
3760                 } else {
3761                         /* PMTU check versus smallest asoc MTU goes here */
3762                         if ((ro->ro_rt != NULL) &&
3763                             (net->ro._s_addr)) {
3764                                 uint32_t mtu;
3765
3766                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
3767                                 if (net->port) {
3768                                         mtu -= sizeof(struct udphdr);
3769                                 }
3770                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
3771                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
3772                                         net->mtu = mtu;
3773                                 }
3774                         } else if (ro->ro_rt == NULL) {
3775                                 /* route was freed */
3776                                 if (net->ro._s_addr &&
3777                                     net->src_addr_selected) {
3778                                         sctp_free_ifa(net->ro._s_addr);
3779                                         net->ro._s_addr = NULL;
3780                                 }
3781                                 net->src_addr_selected = 0;
3782                         }
3783                 }
3784                 return (ret);
3785         }
3786 #ifdef INET6
3787         else if (to->sa_family == AF_INET6) {
3788                 uint32_t flowlabel;
3789                 struct ip6_hdr *ip6h;
3790                 struct route_in6 ip6route;
3791                 struct ifnet *ifp;
3792                 u_char flowTop;
3793                 uint16_t flowBottom;
3794                 u_char tosBottom, tosTop;
3795                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
3796                 int prev_scope = 0;
3797                 struct sockaddr_in6 lsa6_storage;
3798                 int error;
3799                 u_short prev_port = 0;
3800                 int len;
3801
3802                 if (net != NULL) {
3803                         flowlabel = net->tos_flowlabel;
3804                 } else {
3805                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
3806                 }
3807
3808                 len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
3809                 if (port) {
3810                         len += sizeof(struct udphdr);
3811                 }
3812                 newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3813                 if (newm == NULL) {
3814                         sctp_m_freem(m);
3815                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3816                         return (ENOMEM);
3817                 }
3818                 SCTP_ALIGN_TO_END(newm, len);
3819                 SCTP_BUF_LEN(newm) = len;
3820                 SCTP_BUF_NEXT(newm) = m;
3821                 m = newm;
3822                 if (net != NULL) {
3823 #ifdef INVARIANTS
3824                         if (net->flowidset == 0) {
3825                                 panic("Flow ID not set");
3826                         }
3827 #endif
3828                         m->m_pkthdr.flowid = net->flowid;
3829                         m->m_flags |= M_FLOWID;
3830                 } else {
3831                         if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3832                                 m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3833                                 m->m_flags |= M_FLOWID;
3834                         }
3835                 }
3836                 packet_length = sctp_calculate_len(m);
3837
3838                 ip6h = mtod(m, struct ip6_hdr *);
3839                 /*
3840                  * We assume here that inp_flow is in host byte order within
3841                  * the TCB!
3842                  */
3843                 flowBottom = flowlabel & 0x0000ffff;
3844                 flowTop = ((flowlabel & 0x000f0000) >> 16);
3845                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
3846                 /* protect *sin6 from overwrite */
3847                 sin6 = (struct sockaddr_in6 *)to;
3848                 tmp = *sin6;
3849                 sin6 = &tmp;
3850
3851                 /* KAME hack: embed scopeid */
3852                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3853                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3854                         return (EINVAL);
3855                 }
3856                 if (net == NULL) {
3857                         memset(&ip6route, 0, sizeof(ip6route));
3858                         ro = (sctp_route_t *) & ip6route;
3859                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
3860                 } else {
3861                         ro = (sctp_route_t *) & net->ro;
3862                 }
3863                 tosBottom = (((struct in6pcb *)inp)->in6p_flowinfo & 0x0c);
3864                 if (ecn_ok) {
3865                         tosBottom |= sctp_get_ect(stcb, chk);
3866                 }
3867                 tosBottom <<= 4;
3868                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
3869                 if (port) {
3870                         ip6h->ip6_nxt = IPPROTO_UDP;
3871                 } else {
3872                         ip6h->ip6_nxt = IPPROTO_SCTP;
3873                 }
3874                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
3875                 ip6h->ip6_dst = sin6->sin6_addr;
3876
3877                 /*
3878                  * Add SRC address selection here: we can only reuse to a
3879                  * limited degree the kame src-addr-sel, since we can try
3880                  * their selection but it may not be bound.
3881                  */
3882                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
3883                 lsa6_tmp.sin6_family = AF_INET6;
3884                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
3885                 lsa6 = &lsa6_tmp;
3886                 if (net && out_of_asoc_ok == 0) {
3887                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3888                                 sctp_free_ifa(net->ro._s_addr);
3889                                 net->ro._s_addr = NULL;
3890                                 net->src_addr_selected = 0;
3891                                 if (ro->ro_rt) {
3892                                         RTFREE(ro->ro_rt);
3893                                         ro->ro_rt = NULL;
3894                                 }
3895                         }
3896                         if (net->src_addr_selected == 0) {
3897                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
3898                                 /* KAME hack: embed scopeid */
3899                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3900                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3901                                         return (EINVAL);
3902                                 }
3903                                 /* Cache the source address */
3904                                 net->ro._s_addr = sctp_source_address_selection(inp,
3905                                     stcb,
3906                                     ro,
3907                                     net,
3908                                     0,
3909                                     vrf_id);
3910                                 (void)sa6_recoverscope(sin6);
3911                                 net->src_addr_selected = 1;
3912                         }
3913                         if (net->ro._s_addr == NULL) {
3914                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
3915                                 net->src_addr_selected = 0;
3916                                 goto no_route;
3917                         }
3918                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
3919                 } else {
3920                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
3921                         /* KAME hack: embed scopeid */
3922                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
3923                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
3924                                 return (EINVAL);
3925                         }
3926                         if (over_addr == NULL) {
3927                                 struct sctp_ifa *_lsrc;
3928
3929                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
3930                                     net,
3931                                     out_of_asoc_ok,
3932                                     vrf_id);
3933                                 if (_lsrc == NULL) {
3934                                         goto no_route;
3935                                 }
3936                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
3937                                 sctp_free_ifa(_lsrc);
3938                         } else {
3939                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
3940                                 SCTP_RTALLOC(ro, vrf_id);
3941                         }
3942                         (void)sa6_recoverscope(sin6);
3943                 }
3944                 lsa6->sin6_port = inp->sctp_lport;
3945
3946                 if (ro->ro_rt == NULL) {
3947                         /*
3948                          * src addr selection failed to find a route (or
3949                          * valid source addr), so we can't get there from
3950                          * here!
3951                          */
3952                         goto no_route;
3953                 }
3954                 /*
3955                  * XXX: sa6 may not have a valid sin6_scope_id in the
3956                  * non-SCOPEDROUTING case.
3957                  */
3958                 bzero(&lsa6_storage, sizeof(lsa6_storage));
3959                 lsa6_storage.sin6_family = AF_INET6;
3960                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
3961                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3962                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
3963                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
3964                         sctp_m_freem(m);
3965                         return (error);
3966                 }
3967                 /* XXX */
3968                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
3969                 lsa6_storage.sin6_port = inp->sctp_lport;
3970                 lsa6 = &lsa6_storage;
3971                 ip6h->ip6_src = lsa6->sin6_addr;
3972
3973                 if (port) {
3974                         udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3975                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
3976                         udp->uh_dport = port;
3977                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
3978                         udp->uh_sum = 0;
3979                         sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
3980                 } else {
3981                         sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
3982                 }
3983
3984                 sctphdr->src_port = src_port;
3985                 sctphdr->dest_port = dest_port;
3986                 sctphdr->v_tag = v_tag;
3987                 sctphdr->checksum = 0;
3988
3989                 /*
3990                  * We set the hop limit now since there is a good chance
3991                  * that our ro pointer is now filled
3992                  */
3993                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
3994                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
3995
3996 #ifdef SCTP_DEBUG
3997                 /* Copy to be sure something bad is not happening */
3998                 sin6->sin6_addr = ip6h->ip6_dst;
3999                 lsa6->sin6_addr = ip6h->ip6_src;
4000 #endif
4001
4002                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4003                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4004                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4005                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4006                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4007                 if (net) {
4008                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4009                         /* preserve the port and scope for link local send */
4010                         prev_scope = sin6->sin6_scope_id;
4011                         prev_port = sin6->sin6_port;
4012                 }
4013                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4014                         /* failed to prepend data, give up */
4015                         sctp_m_freem(m);
4016                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4017                         return (ENOMEM);
4018                 }
4019 #ifdef  SCTP_PACKET_LOGGING
4020                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4021                         sctp_packet_log(m, packet_length);
4022 #endif
4023                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4024                 if (port) {
4025 #if defined(SCTP_WITH_NO_CSUM)
4026                         SCTP_STAT_INCR(sctps_sendnocrc);
4027 #else
4028                         if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4029                             (stcb) &&
4030                             (stcb->asoc.loopback_scope))) {
4031                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4032                                 SCTP_STAT_INCR(sctps_sendswcrc);
4033                         } else {
4034                                 SCTP_STAT_INCR(sctps_sendnocrc);
4035                         }
4036 #endif
4037                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4038                                 udp->uh_sum = 0xffff;
4039                         }
4040                 } else {
4041 #if defined(SCTP_WITH_NO_CSUM)
4042                         SCTP_STAT_INCR(sctps_sendnocrc);
4043 #else
4044                         m->m_pkthdr.csum_flags = CSUM_SCTP;
4045                         m->m_pkthdr.csum_data = 0;
4046                         SCTP_STAT_INCR(sctps_sendhwcrc);
4047 #endif
4048                 }
4049                 /* send it out. table id is taken from stcb */
4050 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4051                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4052                         so = SCTP_INP_SO(inp);
4053                         SCTP_SOCKET_UNLOCK(so, 0);
4054                 }
4055 #endif
4056                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4057 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4058                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4059                         atomic_add_int(&stcb->asoc.refcnt, 1);
4060                         SCTP_TCB_UNLOCK(stcb);
4061                         SCTP_SOCKET_LOCK(so, 0);
4062                         SCTP_TCB_LOCK(stcb);
4063                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
4064                 }
4065 #endif
4066                 if (net) {
4067                         /* for link local this must be done */
4068                         sin6->sin6_scope_id = prev_scope;
4069                         sin6->sin6_port = prev_port;
4070                 }
4071                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4072                 SCTP_STAT_INCR(sctps_sendpackets);
4073                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4074                 if (ret) {
4075                         SCTP_STAT_INCR(sctps_senderrors);
4076                 }
4077                 if (net == NULL) {
4078                         /* Now if we had a temp route free it */
4079                         if (ro->ro_rt) {
4080                                 RTFREE(ro->ro_rt);
4081                         }
4082                 } else {
4083                         /* PMTU check versus smallest asoc MTU goes here */
4084                         if (ro->ro_rt == NULL) {
4085                                 /* Route was freed */
4086                                 if (net->ro._s_addr &&
4087                                     net->src_addr_selected) {
4088                                         sctp_free_ifa(net->ro._s_addr);
4089                                         net->ro._s_addr = NULL;
4090                                 }
4091                                 net->src_addr_selected = 0;
4092                         }
4093                         if ((ro->ro_rt != NULL) &&
4094                             (net->ro._s_addr)) {
4095                                 uint32_t mtu;
4096
4097                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4098                                 if (mtu &&
4099                                     (stcb->asoc.smallest_mtu > mtu)) {
4100                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4101                                         net->mtu = mtu;
4102                                         if (net->port) {
4103                                                 net->mtu -= sizeof(struct udphdr);
4104                                         }
4105                                 }
4106                         } else if (ifp) {
4107                                 if (ND_IFINFO(ifp)->linkmtu &&
4108                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4109                                         sctp_mtu_size_reset(inp,
4110                                             &stcb->asoc,
4111                                             ND_IFINFO(ifp)->linkmtu);
4112                                 }
4113                         }
4114                 }
4115                 return (ret);
4116         }
4117 #endif
4118         else {
4119                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4120                     ((struct sockaddr *)to)->sa_family);
4121                 sctp_m_freem(m);
4122                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4123                 return (EFAULT);
4124         }
4125 }
4126
4127
4128 void
4129 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4130 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4131     SCTP_UNUSED
4132 #endif
4133 )
4134 {
4135         struct mbuf *m, *m_at, *mp_last;
4136         struct sctp_nets *net;
4137         struct sctp_init_chunk *init;
4138         struct sctp_supported_addr_param *sup_addr;
4139         struct sctp_adaptation_layer_indication *ali;
4140         struct sctp_ecn_supported_param *ecn;
4141         struct sctp_prsctp_supported_param *prsctp;
4142         struct sctp_supported_chunk_types_param *pr_supported;
4143         int cnt_inits_to = 0;
4144         int padval, ret;
4145         int num_ext;
4146         int p_len;
4147
4148         /* INIT's always go to the primary (and usually ONLY address) */
4149         mp_last = NULL;
4150         net = stcb->asoc.primary_destination;
4151         if (net == NULL) {
4152                 net = TAILQ_FIRST(&stcb->asoc.nets);
4153                 if (net == NULL) {
4154                         /* TSNH */
4155                         return;
4156                 }
4157                 /* we confirm any address we send an INIT to */
4158                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4159                 (void)sctp_set_primary_addr(stcb, NULL, net);
4160         } else {
4161                 /* we confirm any address we send an INIT to */
4162                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4163         }
4164         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4165 #ifdef INET6
4166         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4167                 /*
4168                  * special hook, if we are sending to link local it will not
4169                  * show up in our private address count.
4170                  */
4171                 struct sockaddr_in6 *sin6l;
4172
4173                 sin6l = &net->ro._l_addr.sin6;
4174                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4175                         cnt_inits_to = 1;
4176         }
4177 #endif
4178         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4179                 /* This case should not happen */
4180                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4181                 return;
4182         }
4183         /* start the INIT timer */
4184         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4185
4186         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4187         if (m == NULL) {
4188                 /* No memory, INIT timer will re-attempt. */
4189                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4190                 return;
4191         }
4192         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4193         /*
4194          * assume peer supports asconf in order to be able to queue local
4195          * address changes while an INIT is in flight and before the assoc
4196          * is established.
4197          */
4198         stcb->asoc.peer_supports_asconf = 1;
4199         /* Now lets put the SCTP header in place */
4200         init = mtod(m, struct sctp_init_chunk *);
4201         /* now the chunk header */
4202         init->ch.chunk_type = SCTP_INITIATION;
4203         init->ch.chunk_flags = 0;
4204         /* fill in later from mbuf we build */
4205         init->ch.chunk_length = 0;
4206         /* place in my tag */
4207         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4208         /* set up some of the credits. */
4209         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4210             SCTP_MINIMAL_RWND));
4211
4212         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4213         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4214         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4215         /* now the address restriction */
4216         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4217             sizeof(*init));
4218         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4219 #ifdef INET6
4220         /* we support 2 types: IPv6/IPv4 */
4221         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4222         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4223         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4224 #else
4225         /* we support 1 type: IPv4 */
4226         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4227         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4228         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4229 #endif
4230         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4231         /* adaptation layer indication parameter */
4232         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4233         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4234         ali->ph.param_length = htons(sizeof(*ali));
4235         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4236         SCTP_BUF_LEN(m) += sizeof(*ali);
4237         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4238
4239         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4240                 /* Add NAT friendly parameter */
4241                 struct sctp_paramhdr *ph;
4242
4243                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4244                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4245                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4246                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4247                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4248         }
4249         /* now any cookie time extensions */
4250         if (stcb->asoc.cookie_preserve_req) {
4251                 struct sctp_cookie_perserve_param *cookie_preserve;
4252
4253                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4254                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4255                 cookie_preserve->ph.param_length = htons(
4256                     sizeof(*cookie_preserve));
4257                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4258                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4259                 ecn = (struct sctp_ecn_supported_param *)(
4260                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4261                 stcb->asoc.cookie_preserve_req = 0;
4262         }
4263         /* ECN parameter */
4264         if (stcb->asoc.ecn_allowed == 1) {
4265                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4266                 ecn->ph.param_length = htons(sizeof(*ecn));
4267                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4268                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4269                     sizeof(*ecn));
4270         } else {
4271                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4272         }
4273         /* And now tell the peer we do pr-sctp */
4274         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4275         prsctp->ph.param_length = htons(sizeof(*prsctp));
4276         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4277
4278         /* And now tell the peer we do all the extensions */
4279         pr_supported = (struct sctp_supported_chunk_types_param *)
4280             ((caddr_t)prsctp + sizeof(*prsctp));
4281         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4282         num_ext = 0;
4283         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4284         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4285         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4286         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4287         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4288         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4289                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4290         }
4291         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4292                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4293         }
4294         p_len = sizeof(*pr_supported) + num_ext;
4295         pr_supported->ph.param_length = htons(p_len);
4296         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4297         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4298
4299
4300         /* add authentication parameters */
4301         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4302                 struct sctp_auth_random *randp;
4303                 struct sctp_auth_hmac_algo *hmacs;
4304                 struct sctp_auth_chunk_list *chunks;
4305
4306                 /* attach RANDOM parameter, if available */
4307                 if (stcb->asoc.authinfo.random != NULL) {
4308                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4309                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4310                         /* random key already contains the header */
4311                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4312                         /* zero out any padding required */
4313                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4314                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4315                 }
4316                 /* add HMAC_ALGO parameter */
4317                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4318                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4319                     (uint8_t *) hmacs->hmac_ids);
4320                 if (p_len > 0) {
4321                         p_len += sizeof(*hmacs);
4322                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4323                         hmacs->ph.param_length = htons(p_len);
4324                         /* zero out any padding required */
4325                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4326                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4327                 }
4328                 /* add CHUNKS parameter */
4329                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4330                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4331                     chunks->chunk_types);
4332                 if (p_len > 0) {
4333                         p_len += sizeof(*chunks);
4334                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4335                         chunks->ph.param_length = htons(p_len);
4336                         /* zero out any padding required */
4337                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4338                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4339                 }
4340         }
4341         m_at = m;
4342         /* now the addresses */
4343         {
4344                 struct sctp_scoping scp;
4345
4346                 /*
4347                  * To optimize this we could put the scoping stuff into a
4348                  * structure and remove the individual uint8's from the
4349                  * assoc structure. Then we could just sifa in the address
4350                  * within the stcb.. but for now this is a quick hack to get
4351                  * the address stuff teased apart.
4352                  */
4353                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4354                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4355                 scp.loopback_scope = stcb->asoc.loopback_scope;
4356                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4357                 scp.local_scope = stcb->asoc.local_scope;
4358                 scp.site_scope = stcb->asoc.site_scope;
4359
4360                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
4361         }
4362
4363         /* calulate the size and update pkt header and chunk header */
4364         p_len = 0;
4365         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4366                 if (SCTP_BUF_NEXT(m_at) == NULL)
4367                         mp_last = m_at;
4368                 p_len += SCTP_BUF_LEN(m_at);
4369         }
4370         init->ch.chunk_length = htons(p_len);
4371         /*
4372          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4373          * here since the timer will drive a retranmission.
4374          */
4375
4376         /* I don't expect this to execute but we will be safe here */
4377         padval = p_len % 4;
4378         if ((padval) && (mp_last)) {
4379                 /*
4380                  * The compiler worries that mp_last may not be set even
4381                  * though I think it is impossible :-> however we add
4382                  * mp_last here just in case.
4383                  */
4384                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4385                 if (ret) {
4386                         /* Houston we have a problem, no space */
4387                         sctp_m_freem(m);
4388                         return;
4389                 }
4390                 p_len += padval;
4391         }
4392         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4393         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4394             (struct sockaddr *)&net->ro._l_addr,
4395             m, 0, NULL, 0, 0, 0, NULL, 0,
4396             inp->sctp_lport, stcb->rport, htonl(0),
4397             net->port, so_locked, NULL, NULL);
4398         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4399         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4400         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4401 }
4402
4403 struct mbuf *
4404 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4405     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4406 {
4407         /*
4408          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4409          * being equal to the beginning of the params i.e. (iphlen +
4410          * sizeof(struct sctp_init_msg) parse through the parameters to the
4411          * end of the mbuf verifying that all parameters are known.
4412          *
4413          * For unknown parameters build and return a mbuf with
4414          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4415          * processing this chunk stop, and set *abort_processing to 1.
4416          *
4417          * By having param_offset be pre-set to where parameters begin it is
4418          * hoped that this routine may be reused in the future by new
4419          * features.
4420          */
4421         struct sctp_paramhdr *phdr, params;
4422
4423         struct mbuf *mat, *op_err;
4424         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4425         int at, limit, pad_needed;
4426         uint16_t ptype, plen, padded_size;
4427         int err_at;
4428
4429         *abort_processing = 0;
4430         mat = in_initpkt;
4431         err_at = 0;
4432         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4433         at = param_offset;
4434         op_err = NULL;
4435         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4436         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4437         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4438                 ptype = ntohs(phdr->param_type);
4439                 plen = ntohs(phdr->param_length);
4440                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4441                         /* wacked parameter */
4442                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4443                         goto invalid_size;
4444                 }
4445                 limit -= SCTP_SIZE32(plen);
4446                 /*-
4447                  * All parameters for all chunks that we know/understand are
4448                  * listed here. We process them other places and make
4449                  * appropriate stop actions per the upper bits. However this
4450                  * is the generic routine processor's can call to get back
4451                  * an operr.. to either incorporate (init-ack) or send.
4452                  */
4453                 padded_size = SCTP_SIZE32(plen);
4454                 switch (ptype) {
4455                         /* Param's with variable size */
4456                 case SCTP_HEARTBEAT_INFO:
4457                 case SCTP_STATE_COOKIE:
4458                 case SCTP_UNRECOG_PARAM:
4459                 case SCTP_ERROR_CAUSE_IND:
4460                         /* ok skip fwd */
4461                         at += padded_size;
4462                         break;
4463                         /* Param's with variable size within a range */
4464                 case SCTP_CHUNK_LIST:
4465                 case SCTP_SUPPORTED_CHUNK_EXT:
4466                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4467                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4468                                 goto invalid_size;
4469                         }
4470                         at += padded_size;
4471                         break;
4472                 case SCTP_SUPPORTED_ADDRTYPE:
4473                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4474                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4475                                 goto invalid_size;
4476                         }
4477                         at += padded_size;
4478                         break;
4479                 case SCTP_RANDOM:
4480                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4481                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4482                                 goto invalid_size;
4483                         }
4484                         at += padded_size;
4485                         break;
4486                 case SCTP_SET_PRIM_ADDR:
4487                 case SCTP_DEL_IP_ADDRESS:
4488                 case SCTP_ADD_IP_ADDRESS:
4489                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4490                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4491                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4492                                 goto invalid_size;
4493                         }
4494                         at += padded_size;
4495                         break;
4496                         /* Param's with a fixed size */
4497                 case SCTP_IPV4_ADDRESS:
4498                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4499                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4500                                 goto invalid_size;
4501                         }
4502                         at += padded_size;
4503                         break;
4504                 case SCTP_IPV6_ADDRESS:
4505                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4506                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4507                                 goto invalid_size;
4508                         }
4509                         at += padded_size;
4510                         break;
4511                 case SCTP_COOKIE_PRESERVE:
4512                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4513                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4514                                 goto invalid_size;
4515                         }
4516                         at += padded_size;
4517                         break;
4518                 case SCTP_HAS_NAT_SUPPORT:
4519                         *nat_friendly = 1;
4520                         /* fall through */
4521                 case SCTP_PRSCTP_SUPPORTED:
4522
4523                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4524                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4525                                 goto invalid_size;
4526                         }
4527                         at += padded_size;
4528                         break;
4529                 case SCTP_ECN_CAPABLE:
4530                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4531                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4532                                 goto invalid_size;
4533                         }
4534                         at += padded_size;
4535                         break;
4536                 case SCTP_ULP_ADAPTATION:
4537                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4538                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4539                                 goto invalid_size;
4540                         }
4541                         at += padded_size;
4542                         break;
4543                 case SCTP_SUCCESS_REPORT:
4544                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4545                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4546                                 goto invalid_size;
4547                         }
4548                         at += padded_size;
4549                         break;
4550                 case SCTP_HOSTNAME_ADDRESS:
4551                         {
4552                                 /* We can NOT handle HOST NAME addresses!! */
4553                                 int l_len;
4554
4555                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4556                                 *abort_processing = 1;
4557                                 if (op_err == NULL) {
4558                                         /* Ok need to try to get a mbuf */
4559 #ifdef INET6
4560                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4561 #else
4562                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4563 #endif
4564                                         l_len += plen;
4565                                         l_len += sizeof(struct sctp_paramhdr);
4566                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4567                                         if (op_err) {
4568                                                 SCTP_BUF_LEN(op_err) = 0;
4569                                                 /*
4570                                                  * pre-reserve space for ip
4571                                                  * and sctp header  and
4572                                                  * chunk hdr
4573                                                  */
4574 #ifdef INET6
4575                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4576 #else
4577                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4578 #endif
4579                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4580                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4581                                         }
4582                                 }
4583                                 if (op_err) {
4584                                         /* If we have space */
4585                                         struct sctp_paramhdr s;
4586
4587                                         if (err_at % 4) {
4588                                                 uint32_t cpthis = 0;
4589
4590                                                 pad_needed = 4 - (err_at % 4);
4591                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4592                                                 err_at += pad_needed;
4593                                         }
4594                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
4595                                         s.param_length = htons(sizeof(s) + plen);
4596                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4597                                         err_at += sizeof(s);
4598                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4599                                         if (phdr == NULL) {
4600                                                 sctp_m_freem(op_err);
4601                                                 /*
4602                                                  * we are out of memory but
4603                                                  * we still need to have a
4604                                                  * look at what to do (the
4605                                                  * system is in trouble
4606                                                  * though).
4607                                                  */
4608                                                 return (NULL);
4609                                         }
4610                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4611                                         err_at += plen;
4612                                 }
4613                                 return (op_err);
4614                                 break;
4615                         }
4616                 default:
4617                         /*
4618                          * we do not recognize the parameter figure out what
4619                          * we do.
4620                          */
4621                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
4622                         if ((ptype & 0x4000) == 0x4000) {
4623                                 /* Report bit is set?? */
4624                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
4625                                 if (op_err == NULL) {
4626                                         int l_len;
4627
4628                                         /* Ok need to try to get an mbuf */
4629 #ifdef INET6
4630                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4631 #else
4632                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4633 #endif
4634                                         l_len += plen;
4635                                         l_len += sizeof(struct sctp_paramhdr);
4636                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4637                                         if (op_err) {
4638                                                 SCTP_BUF_LEN(op_err) = 0;
4639 #ifdef INET6
4640                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4641 #else
4642                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4643 #endif
4644                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4645                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4646                                         }
4647                                 }
4648                                 if (op_err) {
4649                                         /* If we have space */
4650                                         struct sctp_paramhdr s;
4651
4652                                         if (err_at % 4) {
4653                                                 uint32_t cpthis = 0;
4654
4655                                                 pad_needed = 4 - (err_at % 4);
4656                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4657                                                 err_at += pad_needed;
4658                                         }
4659                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
4660                                         s.param_length = htons(sizeof(s) + plen);
4661                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4662                                         err_at += sizeof(s);
4663                                         if (plen > sizeof(tempbuf)) {
4664                                                 plen = sizeof(tempbuf);
4665                                         }
4666                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
4667                                         if (phdr == NULL) {
4668                                                 sctp_m_freem(op_err);
4669                                                 /*
4670                                                  * we are out of memory but
4671                                                  * we still need to have a
4672                                                  * look at what to do (the
4673                                                  * system is in trouble
4674                                                  * though).
4675                                                  */
4676                                                 op_err = NULL;
4677                                                 goto more_processing;
4678                                         }
4679                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
4680                                         err_at += plen;
4681                                 }
4682                         }
4683         more_processing:
4684                         if ((ptype & 0x8000) == 0x0000) {
4685                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
4686                                 return (op_err);
4687                         } else {
4688                                 /* skip this chunk and continue processing */
4689                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
4690                                 at += SCTP_SIZE32(plen);
4691                         }
4692                         break;
4693
4694                 }
4695                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4696         }
4697         return (op_err);
4698 invalid_size:
4699         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
4700         *abort_processing = 1;
4701         if ((op_err == NULL) && phdr) {
4702                 int l_len;
4703
4704 #ifdef INET6
4705                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4706 #else
4707                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4708 #endif
4709                 l_len += (2 * sizeof(struct sctp_paramhdr));
4710                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4711                 if (op_err) {
4712                         SCTP_BUF_LEN(op_err) = 0;
4713 #ifdef INET6
4714                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4715 #else
4716                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4717 #endif
4718                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
4719                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
4720                 }
4721         }
4722         if ((op_err) && phdr) {
4723                 struct sctp_paramhdr s;
4724
4725                 if (err_at % 4) {
4726                         uint32_t cpthis = 0;
4727
4728                         pad_needed = 4 - (err_at % 4);
4729                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
4730                         err_at += pad_needed;
4731                 }
4732                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
4733                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
4734                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
4735                 err_at += sizeof(s);
4736                 /* Only copy back the p-hdr that caused the issue */
4737                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
4738         }
4739         return (op_err);
4740 }
4741
4742 static int
4743 sctp_are_there_new_addresses(struct sctp_association *asoc,
4744     struct mbuf *in_initpkt, int iphlen, int offset)
4745 {
4746         /*
4747          * Given a INIT packet, look through the packet to verify that there
4748          * are NO new addresses. As we go through the parameters add reports
4749          * of any un-understood parameters that require an error.  Also we
4750          * must return (1) to drop the packet if we see a un-understood
4751          * parameter that tells us to drop the chunk.
4752          */
4753         struct sockaddr_in sin4, *sa4;
4754
4755 #ifdef INET6
4756         struct sockaddr_in6 sin6, *sa6;
4757
4758 #endif
4759         struct sockaddr *sa_touse;
4760         struct sockaddr *sa;
4761         struct sctp_paramhdr *phdr, params;
4762         struct ip *iph;
4763
4764 #ifdef INET6
4765         struct ip6_hdr *ip6h;
4766
4767 #endif
4768         struct mbuf *mat;
4769         uint16_t ptype, plen;
4770         int err_at;
4771         uint8_t fnd;
4772         struct sctp_nets *net;
4773
4774         memset(&sin4, 0, sizeof(sin4));
4775 #ifdef INET6
4776         memset(&sin6, 0, sizeof(sin6));
4777 #endif
4778         sin4.sin_family = AF_INET;
4779         sin4.sin_len = sizeof(sin4);
4780 #ifdef INET6
4781         sin6.sin6_family = AF_INET6;
4782         sin6.sin6_len = sizeof(sin6);
4783 #endif
4784         sa_touse = NULL;
4785         /* First what about the src address of the pkt ? */
4786         iph = mtod(in_initpkt, struct ip *);
4787         switch (iph->ip_v) {
4788         case IPVERSION:
4789                 /* source addr is IPv4 */
4790                 sin4.sin_addr = iph->ip_src;
4791                 sa_touse = (struct sockaddr *)&sin4;
4792                 break;
4793 #ifdef INET6
4794         case IPV6_VERSION >> 4:
4795                 /* source addr is IPv6 */
4796                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
4797                 sin6.sin6_addr = ip6h->ip6_src;
4798                 sa_touse = (struct sockaddr *)&sin6;
4799                 break;
4800 #endif
4801         default:
4802                 return (1);
4803         }
4804
4805         fnd = 0;
4806         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4807                 sa = (struct sockaddr *)&net->ro._l_addr;
4808                 if (sa->sa_family == sa_touse->sa_family) {
4809                         if (sa->sa_family == AF_INET) {
4810                                 sa4 = (struct sockaddr_in *)sa;
4811                                 if (sa4->sin_addr.s_addr ==
4812                                     sin4.sin_addr.s_addr) {
4813                                         fnd = 1;
4814                                         break;
4815                                 }
4816                         }
4817 #ifdef INET6
4818                         if (sa->sa_family == AF_INET6) {
4819                                 sa6 = (struct sockaddr_in6 *)sa;
4820                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
4821                                     &sin6)) {
4822                                         fnd = 1;
4823                                         break;
4824                                 }
4825                         }
4826 #endif
4827                 }
4828         }
4829         if (fnd == 0) {
4830                 /* New address added! no need to look futher. */
4831                 return (1);
4832         }
4833         /* Ok so far lets munge through the rest of the packet */
4834         mat = in_initpkt;
4835         err_at = 0;
4836         sa_touse = NULL;
4837         offset += sizeof(struct sctp_init_chunk);
4838         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4839         while (phdr) {
4840                 ptype = ntohs(phdr->param_type);
4841                 plen = ntohs(phdr->param_length);
4842                 if (ptype == SCTP_IPV4_ADDRESS) {
4843                         struct sctp_ipv4addr_param *p4, p4_buf;
4844
4845                         phdr = sctp_get_next_param(mat, offset,
4846                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
4847                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
4848                             phdr == NULL) {
4849                                 return (1);
4850                         }
4851                         p4 = (struct sctp_ipv4addr_param *)phdr;
4852                         sin4.sin_addr.s_addr = p4->addr;
4853                         sa_touse = (struct sockaddr *)&sin4;
4854                 } else if (ptype == SCTP_IPV6_ADDRESS) {
4855                         struct sctp_ipv6addr_param *p6, p6_buf;
4856
4857                         phdr = sctp_get_next_param(mat, offset,
4858                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
4859                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
4860                             phdr == NULL) {
4861                                 return (1);
4862                         }
4863                         p6 = (struct sctp_ipv6addr_param *)phdr;
4864 #ifdef INET6
4865                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
4866                             sizeof(p6->addr));
4867 #endif
4868                         sa_touse = (struct sockaddr *)&sin4;
4869                 }
4870                 if (sa_touse) {
4871                         /* ok, sa_touse points to one to check */
4872                         fnd = 0;
4873                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
4874                                 sa = (struct sockaddr *)&net->ro._l_addr;
4875                                 if (sa->sa_family != sa_touse->sa_family) {
4876                                         continue;
4877                                 }
4878                                 if (sa->sa_family == AF_INET) {
4879                                         sa4 = (struct sockaddr_in *)sa;
4880                                         if (sa4->sin_addr.s_addr ==
4881                                             sin4.sin_addr.s_addr) {
4882                                                 fnd = 1;
4883                                                 break;
4884                                         }
4885                                 }
4886 #ifdef INET6
4887                                 if (sa->sa_family == AF_INET6) {
4888                                         sa6 = (struct sockaddr_in6 *)sa;
4889                                         if (SCTP6_ARE_ADDR_EQUAL(
4890                                             sa6, &sin6)) {
4891                                                 fnd = 1;
4892                                                 break;
4893                                         }
4894                                 }
4895 #endif
4896                         }
4897                         if (!fnd) {
4898                                 /* New addr added! no need to look further */
4899                                 return (1);
4900                         }
4901                 }
4902                 offset += SCTP_SIZE32(plen);
4903                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
4904         }
4905         return (0);
4906 }
4907
4908 /*
4909  * Given a MBUF chain that was sent into us containing an INIT. Build a
4910  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
4911  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
4912  * message (i.e. the struct sctp_init_msg).
4913  */
4914 void
4915 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
4916     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
4917     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
4918 {
4919         struct sctp_association *asoc;
4920         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
4921         struct sctp_init_ack_chunk *initack;
4922         struct sctp_adaptation_layer_indication *ali;
4923         struct sctp_ecn_supported_param *ecn;
4924         struct sctp_prsctp_supported_param *prsctp;
4925         struct sctp_supported_chunk_types_param *pr_supported;
4926         union sctp_sockstore store, store1, *over_addr;
4927         struct sockaddr_in *sin, *to_sin;
4928
4929 #ifdef INET6
4930         struct sockaddr_in6 *sin6, *to_sin6;
4931
4932 #endif
4933         struct ip *iph;
4934
4935 #ifdef INET6
4936         struct ip6_hdr *ip6;
4937
4938 #endif
4939         struct sockaddr *to;
4940         struct sctp_state_cookie stc;
4941         struct sctp_nets *net = NULL;
4942         uint8_t *signature = NULL;
4943         int cnt_inits_to = 0;
4944         uint16_t his_limit, i_want;
4945         int abort_flag, padval;
4946         int num_ext;
4947         int p_len;
4948         int nat_friendly = 0;
4949         struct socket *so;
4950
4951         if (stcb)
4952                 asoc = &stcb->asoc;
4953         else
4954                 asoc = NULL;
4955         mp_last = NULL;
4956         if ((asoc != NULL) &&
4957             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
4958             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
4959                 /* new addresses, out of here in non-cookie-wait states */
4960                 /*
4961                  * Send a ABORT, we don't add the new address error clause
4962                  * though we even set the T bit and copy in the 0 tag.. this
4963                  * looks no different than if no listener was present.
4964                  */
4965                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
4966                 return;
4967         }
4968         abort_flag = 0;
4969         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
4970             (offset + sizeof(struct sctp_init_chunk)),
4971             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
4972         if (abort_flag) {
4973 do_a_abort:
4974                 sctp_send_abort(init_pkt, iphlen, sh,
4975                     init_chk->init.initiate_tag, op_err, vrf_id, port);
4976                 return;
4977         }
4978         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4979         if (m == NULL) {
4980                 /* No memory, INIT timer will re-attempt. */
4981                 if (op_err)
4982                         sctp_m_freem(op_err);
4983                 return;
4984         }
4985         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4986
4987         /* the time I built cookie */
4988         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
4989
4990         /* populate any tie tags */
4991         if (asoc != NULL) {
4992                 /* unlock before tag selections */
4993                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
4994                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
4995                 stc.cookie_life = asoc->cookie_life;
4996                 net = asoc->primary_destination;
4997         } else {
4998                 stc.tie_tag_my_vtag = 0;
4999                 stc.tie_tag_peer_vtag = 0;
5000                 /* life I will award this cookie */
5001                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5002         }
5003
5004         /* copy in the ports for later check */
5005         stc.myport = sh->dest_port;
5006         stc.peerport = sh->src_port;
5007
5008         /*
5009          * If we wanted to honor cookie life extentions, we would add to
5010          * stc.cookie_life. For now we should NOT honor any extension
5011          */
5012         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5013         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5014                 struct inpcb *in_inp;
5015
5016                 /* Its a V6 socket */
5017                 in_inp = (struct inpcb *)inp;
5018                 stc.ipv6_addr_legal = 1;
5019                 /* Now look at the binding flag to see if V4 will be legal */
5020                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5021                         stc.ipv4_addr_legal = 1;
5022                 } else {
5023                         /* V4 addresses are NOT legal on the association */
5024                         stc.ipv4_addr_legal = 0;
5025                 }
5026         } else {
5027                 /* Its a V4 socket, no - V6 */
5028                 stc.ipv4_addr_legal = 1;
5029                 stc.ipv6_addr_legal = 0;
5030         }
5031
5032 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5033         stc.ipv4_scope = 1;
5034 #else
5035         stc.ipv4_scope = 0;
5036 #endif
5037         /* now for scope setup */
5038         memset((caddr_t)&store, 0, sizeof(store));
5039         memset((caddr_t)&store1, 0, sizeof(store1));
5040         sin = &store.sin;
5041         to_sin = &store1.sin;
5042 #ifdef INET6
5043         sin6 = &store.sin6;
5044         to_sin6 = &store1.sin6;
5045 #endif
5046         iph = mtod(init_pkt, struct ip *);
5047         /* establish the to_addr's */
5048         switch (iph->ip_v) {
5049         case IPVERSION:
5050                 to_sin->sin_port = sh->dest_port;
5051                 to_sin->sin_family = AF_INET;
5052                 to_sin->sin_len = sizeof(struct sockaddr_in);
5053                 to_sin->sin_addr = iph->ip_dst;
5054                 break;
5055 #ifdef INET6
5056         case IPV6_VERSION >> 4:
5057                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5058                 to_sin6->sin6_addr = ip6->ip6_dst;
5059                 to_sin6->sin6_scope_id = 0;
5060                 to_sin6->sin6_port = sh->dest_port;
5061                 to_sin6->sin6_family = AF_INET6;
5062                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5063                 break;
5064 #endif
5065         default:
5066                 goto do_a_abort;
5067                 break;
5068         };
5069
5070         if (net == NULL) {
5071                 to = (struct sockaddr *)&store;
5072                 switch (iph->ip_v) {
5073                 case IPVERSION:
5074                         {
5075                                 sin->sin_family = AF_INET;
5076                                 sin->sin_len = sizeof(struct sockaddr_in);
5077                                 sin->sin_port = sh->src_port;
5078                                 sin->sin_addr = iph->ip_src;
5079                                 /* lookup address */
5080                                 stc.address[0] = sin->sin_addr.s_addr;
5081                                 stc.address[1] = 0;
5082                                 stc.address[2] = 0;
5083                                 stc.address[3] = 0;
5084                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5085                                 /* local from address */
5086                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5087                                 stc.laddress[1] = 0;
5088                                 stc.laddress[2] = 0;
5089                                 stc.laddress[3] = 0;
5090                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5091                                 /* scope_id is only for v6 */
5092                                 stc.scope_id = 0;
5093 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5094                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5095                                         stc.ipv4_scope = 1;
5096                                 }
5097 #else
5098                                 stc.ipv4_scope = 1;
5099 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5100                                 /* Must use the address in this case */
5101                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5102                                         stc.loopback_scope = 1;
5103                                         stc.ipv4_scope = 1;
5104                                         stc.site_scope = 1;
5105                                         stc.local_scope = 0;
5106                                 }
5107                                 break;
5108                         }
5109 #ifdef INET6
5110                 case IPV6_VERSION >> 4:
5111                         {
5112                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5113                                 sin6->sin6_family = AF_INET6;
5114                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5115                                 sin6->sin6_port = sh->src_port;
5116                                 sin6->sin6_addr = ip6->ip6_src;
5117                                 /* lookup address */
5118                                 memcpy(&stc.address, &sin6->sin6_addr,
5119                                     sizeof(struct in6_addr));
5120                                 sin6->sin6_scope_id = 0;
5121                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5122                                 stc.scope_id = 0;
5123                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5124                                         /*
5125                                          * FIX ME: does this have scope from
5126                                          * rcvif?
5127                                          */
5128                                         (void)sa6_recoverscope(sin6);
5129                                         stc.scope_id = sin6->sin6_scope_id;
5130                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5131                                         stc.loopback_scope = 1;
5132                                         stc.local_scope = 0;
5133                                         stc.site_scope = 1;
5134                                         stc.ipv4_scope = 1;
5135                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5136                                         /*
5137                                          * If the new destination is a
5138                                          * LINK_LOCAL we must have common
5139                                          * both site and local scope. Don't
5140                                          * set local scope though since we
5141                                          * must depend on the source to be
5142                                          * added implicitly. We cannot
5143                                          * assure just because we share one
5144                                          * link that all links are common.
5145                                          */
5146                                         stc.local_scope = 0;
5147                                         stc.site_scope = 1;
5148                                         stc.ipv4_scope = 1;
5149                                         /*
5150                                          * we start counting for the private
5151                                          * address stuff at 1. since the
5152                                          * link local we source from won't
5153                                          * show up in our scoped count.
5154                                          */
5155                                         cnt_inits_to = 1;
5156                                         /*
5157                                          * pull out the scope_id from
5158                                          * incoming pkt
5159                                          */
5160                                         /*
5161                                          * FIX ME: does this have scope from
5162                                          * rcvif?
5163                                          */
5164                                         (void)sa6_recoverscope(sin6);
5165                                         stc.scope_id = sin6->sin6_scope_id;
5166                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5167                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5168                                         /*
5169                                          * If the new destination is
5170                                          * SITE_LOCAL then we must have site
5171                                          * scope in common.
5172                                          */
5173                                         stc.site_scope = 1;
5174                                 }
5175                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5176                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5177                                 break;
5178                         }
5179 #endif
5180                 default:
5181                         /* TSNH */
5182                         goto do_a_abort;
5183                         break;
5184                 }
5185         } else {
5186                 /* set the scope per the existing tcb */
5187
5188 #ifdef INET6
5189                 struct sctp_nets *lnet;
5190
5191 #endif
5192
5193                 stc.loopback_scope = asoc->loopback_scope;
5194                 stc.ipv4_scope = asoc->ipv4_local_scope;
5195                 stc.site_scope = asoc->site_scope;
5196                 stc.local_scope = asoc->local_scope;
5197 #ifdef INET6
5198                 /* Why do we not consider IPv4 LL addresses? */
5199                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5200                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5201                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5202                                         /*
5203                                          * if we have a LL address, start
5204                                          * counting at 1.
5205                                          */
5206                                         cnt_inits_to = 1;
5207                                 }
5208                         }
5209                 }
5210 #endif
5211                 /* use the net pointer */
5212                 to = (struct sockaddr *)&net->ro._l_addr;
5213                 switch (to->sa_family) {
5214                 case AF_INET:
5215                         sin = (struct sockaddr_in *)to;
5216                         stc.address[0] = sin->sin_addr.s_addr;
5217                         stc.address[1] = 0;
5218                         stc.address[2] = 0;
5219                         stc.address[3] = 0;
5220                         stc.addr_type = SCTP_IPV4_ADDRESS;
5221                         if (net->src_addr_selected == 0) {
5222                                 /*
5223                                  * strange case here, the INIT should have
5224                                  * did the selection.
5225                                  */
5226                                 net->ro._s_addr = sctp_source_address_selection(inp,
5227                                     stcb, (sctp_route_t *) & net->ro,
5228                                     net, 0, vrf_id);
5229                                 if (net->ro._s_addr == NULL)
5230                                         return;
5231
5232                                 net->src_addr_selected = 1;
5233
5234                         }
5235                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5236                         stc.laddress[1] = 0;
5237                         stc.laddress[2] = 0;
5238                         stc.laddress[3] = 0;
5239                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5240                         break;
5241 #ifdef INET6
5242                 case AF_INET6:
5243                         sin6 = (struct sockaddr_in6 *)to;
5244                         memcpy(&stc.address, &sin6->sin6_addr,
5245                             sizeof(struct in6_addr));
5246                         stc.addr_type = SCTP_IPV6_ADDRESS;
5247                         if (net->src_addr_selected == 0) {
5248                                 /*
5249                                  * strange case here, the INIT should have
5250                                  * did the selection.
5251                                  */
5252                                 net->ro._s_addr = sctp_source_address_selection(inp,
5253                                     stcb, (sctp_route_t *) & net->ro,
5254                                     net, 0, vrf_id);
5255                                 if (net->ro._s_addr == NULL)
5256                                         return;
5257
5258                                 net->src_addr_selected = 1;
5259                         }
5260                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5261                             sizeof(struct in6_addr));
5262                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5263                         break;
5264 #endif
5265                 }
5266         }
5267         /* Now lets put the SCTP header in place */
5268         initack = mtod(m, struct sctp_init_ack_chunk *);
5269         /* Save it off for quick ref */
5270         stc.peers_vtag = init_chk->init.initiate_tag;
5271         /* who are we */
5272         memcpy(stc.identification, SCTP_VERSION_STRING,
5273             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5274         /* now the chunk header */
5275         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5276         initack->ch.chunk_flags = 0;
5277         /* fill in later from mbuf we build */
5278         initack->ch.chunk_length = 0;
5279         /* place in my tag */
5280         if ((asoc != NULL) &&
5281             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5282             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5283             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5284                 /* re-use the v-tags and init-seq here */
5285                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5286                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5287         } else {
5288                 uint32_t vtag, itsn;
5289
5290                 if (hold_inp_lock) {
5291                         SCTP_INP_INCR_REF(inp);
5292                         SCTP_INP_RUNLOCK(inp);
5293                 }
5294                 if (asoc) {
5295                         atomic_add_int(&asoc->refcnt, 1);
5296                         SCTP_TCB_UNLOCK(stcb);
5297         new_tag:
5298                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5299                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5300                                 /*
5301                                  * Got a duplicate vtag on some guy behind a
5302                                  * nat make sure we don't use it.
5303                                  */
5304                                 goto new_tag;
5305                         }
5306                         initack->init.initiate_tag = htonl(vtag);
5307                         /* get a TSN to use too */
5308                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5309                         initack->init.initial_tsn = htonl(itsn);
5310                         SCTP_TCB_LOCK(stcb);
5311                         atomic_add_int(&asoc->refcnt, -1);
5312                 } else {
5313                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5314                         initack->init.initiate_tag = htonl(vtag);
5315                         /* get a TSN to use too */
5316                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5317                 }
5318                 if (hold_inp_lock) {
5319                         SCTP_INP_RLOCK(inp);
5320                         SCTP_INP_DECR_REF(inp);
5321                 }
5322         }
5323         /* save away my tag to */
5324         stc.my_vtag = initack->init.initiate_tag;
5325
5326         /* set up some of the credits. */
5327         so = inp->sctp_socket;
5328         if (so == NULL) {
5329                 /* memory problem */
5330                 sctp_m_freem(m);
5331                 return;
5332         } else {
5333                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5334         }
5335         /* set what I want */
5336         his_limit = ntohs(init_chk->init.num_inbound_streams);
5337         /* choose what I want */
5338         if (asoc != NULL) {
5339                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5340                         i_want = asoc->streamoutcnt;
5341                 } else {
5342                         i_want = inp->sctp_ep.pre_open_stream_count;
5343                 }
5344         } else {
5345                 i_want = inp->sctp_ep.pre_open_stream_count;
5346         }
5347         if (his_limit < i_want) {
5348                 /* I Want more :< */
5349                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5350         } else {
5351                 /* I can have what I want :> */
5352                 initack->init.num_outbound_streams = htons(i_want);
5353         }
5354         /* tell him his limt. */
5355         initack->init.num_inbound_streams =
5356             htons(inp->sctp_ep.max_open_streams_intome);
5357
5358         /* adaptation layer indication parameter */
5359         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5360         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5361         ali->ph.param_length = htons(sizeof(*ali));
5362         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5363         SCTP_BUF_LEN(m) += sizeof(*ali);
5364         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5365
5366         /* ECN parameter */
5367         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5368             (inp->sctp_ecn_enable == 1)) {
5369                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5370                 ecn->ph.param_length = htons(sizeof(*ecn));
5371                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5372
5373                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5374                     sizeof(*ecn));
5375         } else {
5376                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5377         }
5378         /* And now tell the peer we do  pr-sctp */
5379         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5380         prsctp->ph.param_length = htons(sizeof(*prsctp));
5381         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5382         if (nat_friendly) {
5383                 /* Add NAT friendly parameter */
5384                 struct sctp_paramhdr *ph;
5385
5386                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5387                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5388                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5389                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5390         }
5391         /* And now tell the peer we do all the extensions */
5392         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5393         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5394         num_ext = 0;
5395         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5396         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5397         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5398         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5399         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5400         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5401                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5402         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5403                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5404         p_len = sizeof(*pr_supported) + num_ext;
5405         pr_supported->ph.param_length = htons(p_len);
5406         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5407         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5408
5409         /* add authentication parameters */
5410         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5411                 struct sctp_auth_random *randp;
5412                 struct sctp_auth_hmac_algo *hmacs;
5413                 struct sctp_auth_chunk_list *chunks;
5414                 uint16_t random_len;
5415
5416                 /* generate and add RANDOM parameter */
5417                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5418                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5419                 randp->ph.param_type = htons(SCTP_RANDOM);
5420                 p_len = sizeof(*randp) + random_len;
5421                 randp->ph.param_length = htons(p_len);
5422                 SCTP_READ_RANDOM(randp->random_data, random_len);
5423                 /* zero out any padding required */
5424                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5425                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5426
5427                 /* add HMAC_ALGO parameter */
5428                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5429                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5430                     (uint8_t *) hmacs->hmac_ids);
5431                 if (p_len > 0) {
5432                         p_len += sizeof(*hmacs);
5433                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5434                         hmacs->ph.param_length = htons(p_len);
5435                         /* zero out any padding required */
5436                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5437                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5438                 }
5439                 /* add CHUNKS parameter */
5440                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5441                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5442                     chunks->chunk_types);
5443                 if (p_len > 0) {
5444                         p_len += sizeof(*chunks);
5445                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5446                         chunks->ph.param_length = htons(p_len);
5447                         /* zero out any padding required */
5448                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5449                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5450                 }
5451         }
5452         m_at = m;
5453         /* now the addresses */
5454         {
5455                 struct sctp_scoping scp;
5456
5457                 /*
5458                  * To optimize this we could put the scoping stuff into a
5459                  * structure and remove the individual uint8's from the stc
5460                  * structure. Then we could just sifa in the address within
5461                  * the stc.. but for now this is a quick hack to get the
5462                  * address stuff teased apart.
5463                  */
5464                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5465                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5466                 scp.loopback_scope = stc.loopback_scope;
5467                 scp.ipv4_local_scope = stc.ipv4_scope;
5468                 scp.local_scope = stc.local_scope;
5469                 scp.site_scope = stc.site_scope;
5470                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
5471         }
5472
5473         /* tack on the operational error if present */
5474         if (op_err) {
5475                 struct mbuf *ol;
5476                 int llen;
5477
5478                 llen = 0;
5479                 ol = op_err;
5480                 while (ol) {
5481                         llen += SCTP_BUF_LEN(ol);
5482                         ol = SCTP_BUF_NEXT(ol);
5483                 }
5484                 if (llen % 4) {
5485                         /* must add a pad to the param */
5486                         uint32_t cpthis = 0;
5487                         int padlen;
5488
5489                         padlen = 4 - (llen % 4);
5490                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5491                 }
5492                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5493                         m_at = SCTP_BUF_NEXT(m_at);
5494                 }
5495                 SCTP_BUF_NEXT(m_at) = op_err;
5496                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5497                         m_at = SCTP_BUF_NEXT(m_at);
5498                 }
5499         }
5500         /* pre-calulate the size and update pkt header and chunk header */
5501         p_len = 0;
5502         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5503                 p_len += SCTP_BUF_LEN(m_tmp);
5504                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5505                         /* m_tmp should now point to last one */
5506                         break;
5507                 }
5508         }
5509
5510         /* Now we must build a cookie */
5511         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5512         if (m_cookie == NULL) {
5513                 /* memory problem */
5514                 sctp_m_freem(m);
5515                 return;
5516         }
5517         /* Now append the cookie to the end and update the space/size */
5518         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5519
5520         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5521                 p_len += SCTP_BUF_LEN(m_tmp);
5522                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5523                         /* m_tmp should now point to last one */
5524                         mp_last = m_tmp;
5525                         break;
5526                 }
5527         }
5528         /*
5529          * Place in the size, but we don't include the last pad (if any) in
5530          * the INIT-ACK.
5531          */
5532         initack->ch.chunk_length = htons(p_len);
5533
5534         /*
5535          * Time to sign the cookie, we don't sign over the cookie signature
5536          * though thus we set trailer.
5537          */
5538         (void)sctp_hmac_m(SCTP_HMAC,
5539             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5540             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5541             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5542         /*
5543          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5544          * here since the timer will drive a retranmission.
5545          */
5546         padval = p_len % 4;
5547         if ((padval) && (mp_last)) {
5548                 /* see my previous comments on mp_last */
5549                 int ret;
5550
5551                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
5552                 if (ret) {
5553                         /* Houston we have a problem, no space */
5554                         sctp_m_freem(m);
5555                         return;
5556                 }
5557                 p_len += padval;
5558         }
5559         if (stc.loopback_scope) {
5560                 over_addr = &store1;
5561         } else {
5562                 over_addr = NULL;
5563         }
5564
5565         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5566             0, NULL, 0,
5567             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5568             port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
5569         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5570 }
5571
5572
5573 static void
5574 sctp_prune_prsctp(struct sctp_tcb *stcb,
5575     struct sctp_association *asoc,
5576     struct sctp_sndrcvinfo *srcv,
5577     int dataout)
5578 {
5579         int freed_spc = 0;
5580         struct sctp_tmit_chunk *chk, *nchk;
5581
5582         SCTP_TCB_LOCK_ASSERT(stcb);
5583         if ((asoc->peer_supports_prsctp) &&
5584             (asoc->sent_queue_cnt_removeable > 0)) {
5585                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5586                         /*
5587                          * Look for chunks marked with the PR_SCTP flag AND
5588                          * the buffer space flag. If the one being sent is
5589                          * equal or greater priority then purge the old one
5590                          * and free some space.
5591                          */
5592                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5593                                 /*
5594                                  * This one is PR-SCTP AND buffer space
5595                                  * limited type
5596                                  */
5597                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5598                                         /*
5599                                          * Lower numbers equates to higher
5600                                          * priority so if the one we are
5601                                          * looking at has a larger or equal
5602                                          * priority we want to drop the data
5603                                          * and NOT retransmit it.
5604                                          */
5605                                         if (chk->data) {
5606                                                 /*
5607                                                  * We release the book_size
5608                                                  * if the mbuf is here
5609                                                  */
5610                                                 int ret_spc;
5611                                                 int cause;
5612
5613                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5614                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
5615                                                 else
5616                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
5617                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5618                                                     cause,
5619                                                     SCTP_SO_LOCKED);
5620                                                 freed_spc += ret_spc;
5621                                                 if (freed_spc >= dataout) {
5622                                                         return;
5623                                                 }
5624                                         }       /* if chunk was present */
5625                                 }       /* if of sufficent priority */
5626                         }       /* if chunk has enabled */
5627                 }               /* tailqforeach */
5628
5629                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
5630                         /* Here we must move to the sent queue and mark */
5631                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5632                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5633                                         if (chk->data) {
5634                                                 /*
5635                                                  * We release the book_size
5636                                                  * if the mbuf is here
5637                                                  */
5638                                                 int ret_spc;
5639
5640                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5641                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
5642                                                     SCTP_SO_LOCKED);
5643
5644                                                 freed_spc += ret_spc;
5645                                                 if (freed_spc >= dataout) {
5646                                                         return;
5647                                                 }
5648                                         }       /* end if chk->data */
5649                                 }       /* end if right class */
5650                         }       /* end if chk pr-sctp */
5651                 }               /* tailqforeachsafe (chk) */
5652         }                       /* if enabled in asoc */
5653 }
5654
5655 int
5656 sctp_get_frag_point(struct sctp_tcb *stcb,
5657     struct sctp_association *asoc)
5658 {
5659         int siz, ovh;
5660
5661         /*
5662          * For endpoints that have both v6 and v4 addresses we must reserve
5663          * room for the ipv6 header, for those that are only dealing with V4
5664          * we use a larger frag point.
5665          */
5666         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5667                 ovh = SCTP_MED_OVERHEAD;
5668         } else {
5669                 ovh = SCTP_MED_V4_OVERHEAD;
5670         }
5671
5672         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
5673                 siz = asoc->smallest_mtu - ovh;
5674         else
5675                 siz = (stcb->asoc.sctp_frag_point - ovh);
5676         /*
5677          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
5678          */
5679         /* A data chunk MUST fit in a cluster */
5680         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
5681         /* } */
5682
5683         /* adjust for an AUTH chunk if DATA requires auth */
5684         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
5685                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
5686
5687         if (siz % 4) {
5688                 /* make it an even word boundary please */
5689                 siz -= (siz % 4);
5690         }
5691         return (siz);
5692 }
5693
5694 static void
5695 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
5696 {
5697         sp->pr_sctp_on = 0;
5698         /*
5699          * We assume that the user wants PR_SCTP_TTL if the user provides a
5700          * positive lifetime but does not specify any PR_SCTP policy. This
5701          * is a BAD assumption and causes problems at least with the
5702          * U-Vancovers MPI folks. I will change this to be no policy means
5703          * NO PR-SCTP.
5704          */
5705         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
5706                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
5707                 sp->pr_sctp_on = 1;
5708         } else {
5709                 return;
5710         }
5711         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
5712         case CHUNK_FLAGS_PR_SCTP_BUF:
5713                 /*
5714                  * Time to live is a priority stored in tv_sec when doing
5715                  * the buffer drop thing.
5716                  */
5717                 sp->ts.tv_sec = sp->timetolive;
5718                 sp->ts.tv_usec = 0;
5719                 break;
5720         case CHUNK_FLAGS_PR_SCTP_TTL:
5721                 {
5722                         struct timeval tv;
5723
5724                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5725                         tv.tv_sec = sp->timetolive / 1000;
5726                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
5727                         /*
5728                          * TODO sctp_constants.h needs alternative time
5729                          * macros when _KERNEL is undefined.
5730                          */
5731                         timevaladd(&sp->ts, &tv);
5732                 }
5733                 break;
5734         case CHUNK_FLAGS_PR_SCTP_RTX:
5735                 /*
5736                  * Time to live is a the number or retransmissions stored in
5737                  * tv_sec.
5738                  */
5739                 sp->ts.tv_sec = sp->timetolive;
5740                 sp->ts.tv_usec = 0;
5741                 break;
5742         default:
5743                 SCTPDBG(SCTP_DEBUG_USRREQ1,
5744                     "Unknown PR_SCTP policy %u.\n",
5745                     PR_SCTP_POLICY(sp->sinfo_flags));
5746                 break;
5747         }
5748 }
5749
5750 static int
5751 sctp_msg_append(struct sctp_tcb *stcb,
5752     struct sctp_nets *net,
5753     struct mbuf *m,
5754     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
5755 {
5756         int error = 0, holds_lock;
5757         struct mbuf *at;
5758         struct sctp_stream_queue_pending *sp = NULL;
5759         struct sctp_stream_out *strm;
5760
5761         /*
5762          * Given an mbuf chain, put it into the association send queue and
5763          * place it on the wheel
5764          */
5765         holds_lock = hold_stcb_lock;
5766         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
5767                 /* Invalid stream number */
5768                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5769                 error = EINVAL;
5770                 goto out_now;
5771         }
5772         if ((stcb->asoc.stream_locked) &&
5773             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
5774                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
5775                 error = EINVAL;
5776                 goto out_now;
5777         }
5778         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
5779         /* Now can we send this? */
5780         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
5781             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
5782             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
5783             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
5784                 /* got data while shutting down */
5785                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
5786                 error = ECONNRESET;
5787                 goto out_now;
5788         }
5789         sctp_alloc_a_strmoq(stcb, sp);
5790         if (sp == NULL) {
5791                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
5792                 error = ENOMEM;
5793                 goto out_now;
5794         }
5795         sp->sinfo_flags = srcv->sinfo_flags;
5796         sp->timetolive = srcv->sinfo_timetolive;
5797         sp->ppid = srcv->sinfo_ppid;
5798         sp->context = srcv->sinfo_context;
5799         sp->strseq = 0;
5800         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
5801                 sp->net = net;
5802                 atomic_add_int(&sp->net->ref_count, 1);
5803         } else {
5804                 sp->net = NULL;
5805         }
5806         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
5807         sp->stream = srcv->sinfo_stream;
5808         sp->msg_is_complete = 1;
5809         sp->sender_all_done = 1;
5810         sp->some_taken = 0;
5811         sp->data = m;
5812         sp->tail_mbuf = NULL;
5813         sp->length = 0;
5814         at = m;
5815         sctp_set_prsctp_policy(sp);
5816         /*
5817          * We could in theory (for sendall) sifa the length in, but we would
5818          * still have to hunt through the chain since we need to setup the
5819          * tail_mbuf
5820          */
5821         while (at) {
5822                 if (SCTP_BUF_NEXT(at) == NULL)
5823                         sp->tail_mbuf = at;
5824                 sp->length += SCTP_BUF_LEN(at);
5825                 at = SCTP_BUF_NEXT(at);
5826         }
5827         SCTP_TCB_SEND_LOCK(stcb);
5828         sctp_snd_sb_alloc(stcb, sp->length);
5829         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
5830         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
5831         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
5832                 sp->strseq = strm->next_sequence_sent;
5833                 strm->next_sequence_sent++;
5834         }
5835         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
5836         m = NULL;
5837         SCTP_TCB_SEND_UNLOCK(stcb);
5838 out_now:
5839         if (m) {
5840                 sctp_m_freem(m);
5841         }
5842         return (error);
5843 }
5844
5845
5846 static struct mbuf *
5847 sctp_copy_mbufchain(struct mbuf *clonechain,
5848     struct mbuf *outchain,
5849     struct mbuf **endofchain,
5850     int can_take_mbuf,
5851     int sizeofcpy,
5852     uint8_t copy_by_ref)
5853 {
5854         struct mbuf *m;
5855         struct mbuf *appendchain;
5856         caddr_t cp;
5857         int len;
5858
5859         if (endofchain == NULL) {
5860                 /* error */
5861 error_out:
5862                 if (outchain)
5863                         sctp_m_freem(outchain);
5864                 return (NULL);
5865         }
5866         if (can_take_mbuf) {
5867                 appendchain = clonechain;
5868         } else {
5869                 if (!copy_by_ref &&
5870                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
5871                     ) {
5872                         /* Its not in a cluster */
5873                         if (*endofchain == NULL) {
5874                                 /* lets get a mbuf cluster */
5875                                 if (outchain == NULL) {
5876                                         /* This is the general case */
5877                         new_mbuf:
5878                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5879                                         if (outchain == NULL) {
5880                                                 goto error_out;
5881                                         }
5882                                         SCTP_BUF_LEN(outchain) = 0;
5883                                         *endofchain = outchain;
5884                                         /* get the prepend space */
5885                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
5886                                 } else {
5887                                         /*
5888                                          * We really should not get a NULL
5889                                          * in endofchain
5890                                          */
5891                                         /* find end */
5892                                         m = outchain;
5893                                         while (m) {
5894                                                 if (SCTP_BUF_NEXT(m) == NULL) {
5895                                                         *endofchain = m;
5896                                                         break;
5897                                                 }
5898                                                 m = SCTP_BUF_NEXT(m);
5899                                         }
5900                                         /* sanity */
5901                                         if (*endofchain == NULL) {
5902                                                 /*
5903                                                  * huh, TSNH XXX maybe we
5904                                                  * should panic
5905                                                  */
5906                                                 sctp_m_freem(outchain);
5907                                                 goto new_mbuf;
5908                                         }
5909                                 }
5910                                 /* get the new end of length */
5911                                 len = M_TRAILINGSPACE(*endofchain);
5912                         } else {
5913                                 /* how much is left at the end? */
5914                                 len = M_TRAILINGSPACE(*endofchain);
5915                         }
5916                         /* Find the end of the data, for appending */
5917                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
5918
5919                         /* Now lets copy it out */
5920                         if (len >= sizeofcpy) {
5921                                 /* It all fits, copy it in */
5922                                 m_copydata(clonechain, 0, sizeofcpy, cp);
5923                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5924                         } else {
5925                                 /* fill up the end of the chain */
5926                                 if (len > 0) {
5927                                         m_copydata(clonechain, 0, len, cp);
5928                                         SCTP_BUF_LEN((*endofchain)) += len;
5929                                         /* now we need another one */
5930                                         sizeofcpy -= len;
5931                                 }
5932                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
5933                                 if (m == NULL) {
5934                                         /* We failed */
5935                                         goto error_out;
5936                                 }
5937                                 SCTP_BUF_NEXT((*endofchain)) = m;
5938                                 *endofchain = m;
5939                                 cp = mtod((*endofchain), caddr_t);
5940                                 m_copydata(clonechain, len, sizeofcpy, cp);
5941                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
5942                         }
5943                         return (outchain);
5944                 } else {
5945                         /* copy the old fashion way */
5946                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
5947 #ifdef SCTP_MBUF_LOGGING
5948                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5949                                 struct mbuf *mat;
5950
5951                                 mat = appendchain;
5952                                 while (mat) {
5953                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5954                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5955                                         }
5956                                         mat = SCTP_BUF_NEXT(mat);
5957                                 }
5958                         }
5959 #endif
5960                 }
5961         }
5962         if (appendchain == NULL) {
5963                 /* error */
5964                 if (outchain)
5965                         sctp_m_freem(outchain);
5966                 return (NULL);
5967         }
5968         if (outchain) {
5969                 /* tack on to the end */
5970                 if (*endofchain != NULL) {
5971                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
5972                 } else {
5973                         m = outchain;
5974                         while (m) {
5975                                 if (SCTP_BUF_NEXT(m) == NULL) {
5976                                         SCTP_BUF_NEXT(m) = appendchain;
5977                                         break;
5978                                 }
5979                                 m = SCTP_BUF_NEXT(m);
5980                         }
5981                 }
5982                 /*
5983                  * save off the end and update the end-chain postion
5984                  */
5985                 m = appendchain;
5986                 while (m) {
5987                         if (SCTP_BUF_NEXT(m) == NULL) {
5988                                 *endofchain = m;
5989                                 break;
5990                         }
5991                         m = SCTP_BUF_NEXT(m);
5992                 }
5993                 return (outchain);
5994         } else {
5995                 /* save off the end and update the end-chain postion */
5996                 m = appendchain;
5997                 while (m) {
5998                         if (SCTP_BUF_NEXT(m) == NULL) {
5999                                 *endofchain = m;
6000                                 break;
6001                         }
6002                         m = SCTP_BUF_NEXT(m);
6003                 }
6004                 return (appendchain);
6005         }
6006 }
6007
6008 int
6009 sctp_med_chunk_output(struct sctp_inpcb *inp,
6010     struct sctp_tcb *stcb,
6011     struct sctp_association *asoc,
6012     int *num_out,
6013     int *reason_code,
6014     int control_only, int from_where,
6015     struct timeval *now, int *now_filled, int frag_point, int so_locked
6016 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6017     SCTP_UNUSED
6018 #endif
6019 );
6020
6021 static void
6022 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6023     uint32_t val)
6024 {
6025         struct sctp_copy_all *ca;
6026         struct mbuf *m;
6027         int ret = 0;
6028         int added_control = 0;
6029         int un_sent, do_chunk_output = 1;
6030         struct sctp_association *asoc;
6031
6032         ca = (struct sctp_copy_all *)ptr;
6033         if (ca->m == NULL) {
6034                 return;
6035         }
6036         if (ca->inp != inp) {
6037                 /* TSNH */
6038                 return;
6039         }
6040         if ((ca->m) && ca->sndlen) {
6041                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6042                 if (m == NULL) {
6043                         /* can't copy so we are done */
6044                         ca->cnt_failed++;
6045                         return;
6046                 }
6047 #ifdef SCTP_MBUF_LOGGING
6048                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6049                         struct mbuf *mat;
6050
6051                         mat = m;
6052                         while (mat) {
6053                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6054                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6055                                 }
6056                                 mat = SCTP_BUF_NEXT(mat);
6057                         }
6058                 }
6059 #endif
6060         } else {
6061                 m = NULL;
6062         }
6063         SCTP_TCB_LOCK_ASSERT(stcb);
6064         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6065                 /* Abort this assoc with m as the user defined reason */
6066                 if (m) {
6067                         struct sctp_paramhdr *ph;
6068
6069                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6070                         if (m) {
6071                                 ph = mtod(m, struct sctp_paramhdr *);
6072                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6073                                 ph->param_length = htons(ca->sndlen);
6074                         }
6075                         /*
6076                          * We add one here to keep the assoc from
6077                          * dis-appearing on us.
6078                          */
6079                         atomic_add_int(&stcb->asoc.refcnt, 1);
6080                         sctp_abort_an_association(inp, stcb,
6081                             SCTP_RESPONSE_TO_USER_REQ,
6082                             m, SCTP_SO_NOT_LOCKED);
6083                         /*
6084                          * sctp_abort_an_association calls sctp_free_asoc()
6085                          * free association will NOT free it since we
6086                          * incremented the refcnt .. we do this to prevent
6087                          * it being freed and things getting tricky since we
6088                          * could end up (from free_asoc) calling inpcb_free
6089                          * which would get a recursive lock call to the
6090                          * iterator lock.. But as a consequence of that the
6091                          * stcb will return to us un-locked.. since
6092                          * free_asoc returns with either no TCB or the TCB
6093                          * unlocked, we must relock.. to unlock in the
6094                          * iterator timer :-0
6095                          */
6096                         SCTP_TCB_LOCK(stcb);
6097                         atomic_add_int(&stcb->asoc.refcnt, -1);
6098                         goto no_chunk_output;
6099                 }
6100         } else {
6101                 if (m) {
6102                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
6103                             &ca->sndrcv, 1);
6104                 }
6105                 asoc = &stcb->asoc;
6106                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6107                         /* shutdown this assoc */
6108                         int cnt;
6109
6110                         cnt = sctp_is_there_unsent_data(stcb);
6111
6112                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6113                             TAILQ_EMPTY(&asoc->sent_queue) &&
6114                             (cnt == 0)) {
6115                                 if (asoc->locked_on_sending) {
6116                                         goto abort_anyway;
6117                                 }
6118                                 /*
6119                                  * there is nothing queued to send, so I'm
6120                                  * done...
6121                                  */
6122                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6123                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6124                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6125                                         /*
6126                                          * only send SHUTDOWN the first time
6127                                          * through
6128                                          */
6129                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
6130                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6131                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6132                                         }
6133                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6134                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6135                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6136                                             asoc->primary_destination);
6137                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6138                                             asoc->primary_destination);
6139                                         added_control = 1;
6140                                         do_chunk_output = 0;
6141                                 }
6142                         } else {
6143                                 /*
6144                                  * we still got (or just got) data to send,
6145                                  * so set SHUTDOWN_PENDING
6146                                  */
6147                                 /*
6148                                  * XXX sockets draft says that SCTP_EOF
6149                                  * should be sent with no data.  currently,
6150                                  * we will allow user data to be sent first
6151                                  * and move to SHUTDOWN-PENDING
6152                                  */
6153                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6154                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6155                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6156                                         if (asoc->locked_on_sending) {
6157                                                 /*
6158                                                  * Locked to send out the
6159                                                  * data
6160                                                  */
6161                                                 struct sctp_stream_queue_pending *sp;
6162
6163                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6164                                                 if (sp) {
6165                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6166                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6167                                                 }
6168                                         }
6169                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6170                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6171                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6172                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6173                                 abort_anyway:
6174                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6175                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6176                                                     SCTP_RESPONSE_TO_USER_REQ,
6177                                                     NULL, SCTP_SO_NOT_LOCKED);
6178                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6179                                                 goto no_chunk_output;
6180                                         }
6181                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6182                                             asoc->primary_destination);
6183                                 }
6184                         }
6185
6186                 }
6187         }
6188         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6189             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6190
6191         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6192             (stcb->asoc.total_flight > 0) &&
6193             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6194             ) {
6195                 do_chunk_output = 0;
6196         }
6197         if (do_chunk_output)
6198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6199         else if (added_control) {
6200                 int num_out = 0, reason = 0, now_filled = 0;
6201                 struct timeval now;
6202                 int frag_point;
6203
6204                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6205                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6206                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6207         }
6208 no_chunk_output:
6209         if (ret) {
6210                 ca->cnt_failed++;
6211         } else {
6212                 ca->cnt_sent++;
6213         }
6214 }
6215
6216 static void
6217 sctp_sendall_completes(void *ptr, uint32_t val)
6218 {
6219         struct sctp_copy_all *ca;
6220
6221         ca = (struct sctp_copy_all *)ptr;
6222         /*
6223          * Do a notify here? Kacheong suggests that the notify be done at
6224          * the send time.. so you would push up a notification if any send
6225          * failed. Don't know if this is feasable since the only failures we
6226          * have is "memory" related and if you cannot get an mbuf to send
6227          * the data you surely can't get an mbuf to send up to notify the
6228          * user you can't send the data :->
6229          */
6230
6231         /* now free everything */
6232         sctp_m_freem(ca->m);
6233         SCTP_FREE(ca, SCTP_M_COPYAL);
6234 }
6235
6236
6237 #define MC_ALIGN(m, len) do {                                           \
6238         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6239 } while (0)
6240
6241
6242
6243 static struct mbuf *
6244 sctp_copy_out_all(struct uio *uio, int len)
6245 {
6246         struct mbuf *ret, *at;
6247         int left, willcpy, cancpy, error;
6248
6249         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6250         if (ret == NULL) {
6251                 /* TSNH */
6252                 return (NULL);
6253         }
6254         left = len;
6255         SCTP_BUF_LEN(ret) = 0;
6256         /* save space for the data chunk header */
6257         cancpy = M_TRAILINGSPACE(ret);
6258         willcpy = min(cancpy, left);
6259         at = ret;
6260         while (left > 0) {
6261                 /* Align data to the end */
6262                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6263                 if (error) {
6264         err_out_now:
6265                         sctp_m_freem(at);
6266                         return (NULL);
6267                 }
6268                 SCTP_BUF_LEN(at) = willcpy;
6269                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6270                 left -= willcpy;
6271                 if (left > 0) {
6272                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6273                         if (SCTP_BUF_NEXT(at) == NULL) {
6274                                 goto err_out_now;
6275                         }
6276                         at = SCTP_BUF_NEXT(at);
6277                         SCTP_BUF_LEN(at) = 0;
6278                         cancpy = M_TRAILINGSPACE(at);
6279                         willcpy = min(cancpy, left);
6280                 }
6281         }
6282         return (ret);
6283 }
6284
6285 static int
6286 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6287     struct sctp_sndrcvinfo *srcv)
6288 {
6289         int ret;
6290         struct sctp_copy_all *ca;
6291
6292         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6293             SCTP_M_COPYAL);
6294         if (ca == NULL) {
6295                 sctp_m_freem(m);
6296                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6297                 return (ENOMEM);
6298         }
6299         memset(ca, 0, sizeof(struct sctp_copy_all));
6300
6301         ca->inp = inp;
6302         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6303         /*
6304          * take off the sendall flag, it would be bad if we failed to do
6305          * this :-0
6306          */
6307         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6308         /* get length and mbuf chain */
6309         if (uio) {
6310                 ca->sndlen = uio->uio_resid;
6311                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6312                 if (ca->m == NULL) {
6313                         SCTP_FREE(ca, SCTP_M_COPYAL);
6314                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6315                         return (ENOMEM);
6316                 }
6317         } else {
6318                 /* Gather the length of the send */
6319                 struct mbuf *mat;
6320
6321                 mat = m;
6322                 ca->sndlen = 0;
6323                 while (m) {
6324                         ca->sndlen += SCTP_BUF_LEN(m);
6325                         m = SCTP_BUF_NEXT(m);
6326                 }
6327                 ca->m = mat;
6328         }
6329         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6330             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6331             SCTP_ASOC_ANY_STATE,
6332             (void *)ca, 0,
6333             sctp_sendall_completes, inp, 1);
6334         if (ret) {
6335                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6336                 SCTP_FREE(ca, SCTP_M_COPYAL);
6337                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6338                 return (EFAULT);
6339         }
6340         return (0);
6341 }
6342
6343
6344 void
6345 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6346 {
6347         struct sctp_tmit_chunk *chk, *nchk;
6348
6349         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6350                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6351                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6352                         if (chk->data) {
6353                                 sctp_m_freem(chk->data);
6354                                 chk->data = NULL;
6355                         }
6356                         asoc->ctrl_queue_cnt--;
6357                         sctp_free_a_chunk(stcb, chk);
6358                 }
6359         }
6360 }
6361
6362 void
6363 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6364 {
6365         struct sctp_association *asoc;
6366         struct sctp_tmit_chunk *chk, *nchk;
6367         struct sctp_asconf_chunk *acp;
6368
6369         asoc = &stcb->asoc;
6370         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6371                 /* find SCTP_ASCONF chunk in queue */
6372                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6373                         if (chk->data) {
6374                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6375                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6376                                         /* Not Acked yet */
6377                                         break;
6378                                 }
6379                         }
6380                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6381                         if (chk->data) {
6382                                 sctp_m_freem(chk->data);
6383                                 chk->data = NULL;
6384                         }
6385                         asoc->ctrl_queue_cnt--;
6386                         sctp_free_a_chunk(stcb, chk);
6387                 }
6388         }
6389 }
6390
6391
6392 static void
6393 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6394     struct sctp_association *asoc,
6395     struct sctp_tmit_chunk **data_list,
6396     int bundle_at,
6397     struct sctp_nets *net)
6398 {
6399         int i;
6400         struct sctp_tmit_chunk *tp1;
6401
6402         for (i = 0; i < bundle_at; i++) {
6403                 /* off of the send queue */
6404                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6405                 asoc->send_queue_cnt--;
6406                 if (i > 0) {
6407                         /*
6408                          * Any chunk NOT 0 you zap the time chunk 0 gets
6409                          * zapped or set based on if a RTO measurment is
6410                          * needed.
6411                          */
6412                         data_list[i]->do_rtt = 0;
6413                 }
6414                 /* record time */
6415                 data_list[i]->sent_rcv_time = net->last_sent_time;
6416                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6417                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6418                 if (data_list[i]->whoTo == NULL) {
6419                         data_list[i]->whoTo = net;
6420                         atomic_add_int(&net->ref_count, 1);
6421                 }
6422                 /* on to the sent queue */
6423                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6424                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6425                         struct sctp_tmit_chunk *tpp;
6426
6427                         /* need to move back */
6428         back_up_more:
6429                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6430                         if (tpp == NULL) {
6431                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6432                                 goto all_done;
6433                         }
6434                         tp1 = tpp;
6435                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6436                                 goto back_up_more;
6437                         }
6438                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6439                 } else {
6440                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6441                             data_list[i],
6442                             sctp_next);
6443                 }
6444 all_done:
6445                 /* This does not lower until the cum-ack passes it */
6446                 asoc->sent_queue_cnt++;
6447                 if ((asoc->peers_rwnd <= 0) &&
6448                     (asoc->total_flight == 0) &&
6449                     (bundle_at == 1)) {
6450                         /* Mark the chunk as being a window probe */
6451                         SCTP_STAT_INCR(sctps_windowprobed);
6452                 }
6453 #ifdef SCTP_AUDITING_ENABLED
6454                 sctp_audit_log(0xC2, 3);
6455 #endif
6456                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6457                 data_list[i]->snd_count = 1;
6458                 data_list[i]->rec.data.chunk_was_revoked = 0;
6459                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6460                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6461                             data_list[i]->whoTo->flight_size,
6462                             data_list[i]->book_size,
6463                             (uintptr_t) data_list[i]->whoTo,
6464                             data_list[i]->rec.data.TSN_seq);
6465                 }
6466                 sctp_flight_size_increase(data_list[i]);
6467                 sctp_total_flight_increase(stcb, data_list[i]);
6468                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6469                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6470                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6471                 }
6472                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6473                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6474                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6475                         /* SWS sender side engages */
6476                         asoc->peers_rwnd = 0;
6477                 }
6478         }
6479         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6480                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6481         }
6482 }
6483
6484 static void
6485 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
6486 {
6487         struct sctp_tmit_chunk *chk, *nchk;
6488
6489         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6490                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6491                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6492                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6493                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6494                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6495                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6496                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6497                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6498                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6499                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6500                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6501                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6502                         /* Stray chunks must be cleaned up */
6503         clean_up_anyway:
6504                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6505                         if (chk->data) {
6506                                 sctp_m_freem(chk->data);
6507                                 chk->data = NULL;
6508                         }
6509                         asoc->ctrl_queue_cnt--;
6510                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6511                                 asoc->fwd_tsn_cnt--;
6512                         sctp_free_a_chunk(stcb, chk);
6513                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6514                         /* special handling, we must look into the param */
6515                         if (chk != asoc->str_reset) {
6516                                 goto clean_up_anyway;
6517                         }
6518                 }
6519         }
6520 }
6521
6522
6523 static int
6524 sctp_can_we_split_this(struct sctp_tcb *stcb,
6525     uint32_t length,
6526     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6527 {
6528         /*
6529          * Make a decision on if I should split a msg into multiple parts.
6530          * This is only asked of incomplete messages.
6531          */
6532         if (eeor_on) {
6533                 /*
6534                  * If we are doing EEOR we need to always send it if its the
6535                  * entire thing, since it might be all the guy is putting in
6536                  * the hopper.
6537                  */
6538                 if (goal_mtu >= length) {
6539                         /*-
6540                          * If we have data outstanding,
6541                          * we get another chance when the sack
6542                          * arrives to transmit - wait for more data
6543                          */
6544                         if (stcb->asoc.total_flight == 0) {
6545                                 /*
6546                                  * If nothing is in flight, we zero the
6547                                  * packet counter.
6548                                  */
6549                                 return (length);
6550                         }
6551                         return (0);
6552
6553                 } else {
6554                         /* You can fill the rest */
6555                         return (goal_mtu);
6556                 }
6557         }
6558         /*-
6559          * For those strange folk that make the send buffer
6560          * smaller than our fragmentation point, we can't
6561          * get a full msg in so we have to allow splitting.
6562          */
6563         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6564                 return (length);
6565         }
6566         if ((length <= goal_mtu) ||
6567             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6568                 /* Sub-optimial residual don't split in non-eeor mode. */
6569                 return (0);
6570         }
6571         /*
6572          * If we reach here length is larger than the goal_mtu. Do we wish
6573          * to split it for the sake of packet putting together?
6574          */
6575         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6576                 /* Its ok to split it */
6577                 return (min(goal_mtu, frag_point));
6578         }
6579         /* Nope, can't split */
6580         return (0);
6581
6582 }
6583
6584 static uint32_t
6585 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6586     struct sctp_stream_out *strq,
6587     uint32_t goal_mtu,
6588     uint32_t frag_point,
6589     int *locked,
6590     int *giveup,
6591     int eeor_mode,
6592     int *bail)
6593 {
6594         /* Move from the stream to the send_queue keeping track of the total */
6595         struct sctp_association *asoc;
6596         struct sctp_stream_queue_pending *sp;
6597         struct sctp_tmit_chunk *chk;
6598         struct sctp_data_chunk *dchkh;
6599         uint32_t to_move, length;
6600         uint8_t rcv_flags = 0;
6601         uint8_t some_taken;
6602         uint8_t send_lock_up = 0;
6603
6604         SCTP_TCB_LOCK_ASSERT(stcb);
6605         asoc = &stcb->asoc;
6606 one_more_time:
6607         /* sa_ignore FREED_MEMORY */
6608         sp = TAILQ_FIRST(&strq->outqueue);
6609         if (sp == NULL) {
6610                 *locked = 0;
6611                 if (send_lock_up == 0) {
6612                         SCTP_TCB_SEND_LOCK(stcb);
6613                         send_lock_up = 1;
6614                 }
6615                 sp = TAILQ_FIRST(&strq->outqueue);
6616                 if (sp) {
6617                         goto one_more_time;
6618                 }
6619                 if (strq->last_msg_incomplete) {
6620                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
6621                             strq->stream_no,
6622                             strq->last_msg_incomplete);
6623                         strq->last_msg_incomplete = 0;
6624                 }
6625                 to_move = 0;
6626                 if (send_lock_up) {
6627                         SCTP_TCB_SEND_UNLOCK(stcb);
6628                         send_lock_up = 0;
6629                 }
6630                 goto out_of;
6631         }
6632         if ((sp->msg_is_complete) && (sp->length == 0)) {
6633                 if (sp->sender_all_done) {
6634                         /*
6635                          * We are doing differed cleanup. Last time through
6636                          * when we took all the data the sender_all_done was
6637                          * not set.
6638                          */
6639                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
6640                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
6641                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
6642                                     sp->sender_all_done,
6643                                     sp->length,
6644                                     sp->msg_is_complete,
6645                                     sp->put_last_out,
6646                                     send_lock_up);
6647                         }
6648                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
6649                                 SCTP_TCB_SEND_LOCK(stcb);
6650                                 send_lock_up = 1;
6651                         }
6652                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
6653                         TAILQ_REMOVE(&strq->outqueue, sp, next);
6654                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
6655                         if (sp->net) {
6656                                 sctp_free_remote_addr(sp->net);
6657                                 sp->net = NULL;
6658                         }
6659                         if (sp->data) {
6660                                 sctp_m_freem(sp->data);
6661                                 sp->data = NULL;
6662                         }
6663                         sctp_free_a_strmoq(stcb, sp);
6664                         /* we can't be locked to it */
6665                         *locked = 0;
6666                         stcb->asoc.locked_on_sending = NULL;
6667                         if (send_lock_up) {
6668                                 SCTP_TCB_SEND_UNLOCK(stcb);
6669                                 send_lock_up = 0;
6670                         }
6671                         /* back to get the next msg */
6672                         goto one_more_time;
6673                 } else {
6674                         /*
6675                          * sender just finished this but still holds a
6676                          * reference
6677                          */
6678                         *locked = 1;
6679                         *giveup = 1;
6680                         to_move = 0;
6681                         goto out_of;
6682                 }
6683         } else {
6684                 /* is there some to get */
6685                 if (sp->length == 0) {
6686                         /* no */
6687                         *locked = 1;
6688                         *giveup = 1;
6689                         to_move = 0;
6690                         goto out_of;
6691                 } else if (sp->discard_rest) {
6692                         if (send_lock_up == 0) {
6693                                 SCTP_TCB_SEND_LOCK(stcb);
6694                                 send_lock_up = 1;
6695                         }
6696                         /* Whack down the size */
6697                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
6698                         if ((stcb->sctp_socket != NULL) && \
6699                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
6700                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
6701                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
6702                         }
6703                         if (sp->data) {
6704                                 sctp_m_freem(sp->data);
6705                                 sp->data = NULL;
6706                                 sp->tail_mbuf = NULL;
6707                         }
6708                         sp->length = 0;
6709                         sp->some_taken = 1;
6710                         *locked = 1;
6711                         *giveup = 1;
6712                         to_move = 0;
6713                         goto out_of;
6714                 }
6715         }
6716         some_taken = sp->some_taken;
6717         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
6718                 sp->msg_is_complete = 1;
6719         }
6720 re_look:
6721         length = sp->length;
6722         if (sp->msg_is_complete) {
6723                 /* The message is complete */
6724                 to_move = min(length, frag_point);
6725                 if (to_move == length) {
6726                         /* All of it fits in the MTU */
6727                         if (sp->some_taken) {
6728                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
6729                                 sp->put_last_out = 1;
6730                         } else {
6731                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
6732                                 sp->put_last_out = 1;
6733                         }
6734                 } else {
6735                         /* Not all of it fits, we fragment */
6736                         if (sp->some_taken == 0) {
6737                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6738                         }
6739                         sp->some_taken = 1;
6740                 }
6741         } else {
6742                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
6743                 if (to_move) {
6744                         /*-
6745                          * We use a snapshot of length in case it
6746                          * is expanding during the compare.
6747                          */
6748                         uint32_t llen;
6749
6750                         llen = length;
6751                         if (to_move >= llen) {
6752                                 to_move = llen;
6753                                 if (send_lock_up == 0) {
6754                                         /*-
6755                                          * We are taking all of an incomplete msg
6756                                          * thus we need a send lock.
6757                                          */
6758                                         SCTP_TCB_SEND_LOCK(stcb);
6759                                         send_lock_up = 1;
6760                                         if (sp->msg_is_complete) {
6761                                                 /*
6762                                                  * the sender finished the
6763                                                  * msg
6764                                                  */
6765                                                 goto re_look;
6766                                         }
6767                                 }
6768                         }
6769                         if (sp->some_taken == 0) {
6770                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
6771                                 sp->some_taken = 1;
6772                         }
6773                 } else {
6774                         /* Nothing to take. */
6775                         if (sp->some_taken) {
6776                                 *locked = 1;
6777                         }
6778                         *giveup = 1;
6779                         to_move = 0;
6780                         goto out_of;
6781                 }
6782         }
6783
6784         /* If we reach here, we can copy out a chunk */
6785         sctp_alloc_a_chunk(stcb, chk);
6786         if (chk == NULL) {
6787                 /* No chunk memory */
6788                 *giveup = 1;
6789                 to_move = 0;
6790                 goto out_of;
6791         }
6792         /*
6793          * Setup for unordered if needed by looking at the user sent info
6794          * flags.
6795          */
6796         if (sp->sinfo_flags & SCTP_UNORDERED) {
6797                 rcv_flags |= SCTP_DATA_UNORDERED;
6798         }
6799         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
6800             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
6801                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
6802         }
6803         /* clear out the chunk before setting up */
6804         memset(chk, 0, sizeof(*chk));
6805         chk->rec.data.rcv_flags = rcv_flags;
6806
6807         if (to_move >= length) {
6808                 /* we think we can steal the whole thing */
6809                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
6810                         SCTP_TCB_SEND_LOCK(stcb);
6811                         send_lock_up = 1;
6812                 }
6813                 if (to_move < sp->length) {
6814                         /* bail, it changed */
6815                         goto dont_do_it;
6816                 }
6817                 chk->data = sp->data;
6818                 chk->last_mbuf = sp->tail_mbuf;
6819                 /* register the stealing */
6820                 sp->data = sp->tail_mbuf = NULL;
6821         } else {
6822                 struct mbuf *m;
6823
6824 dont_do_it:
6825                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
6826                 chk->last_mbuf = NULL;
6827                 if (chk->data == NULL) {
6828                         sp->some_taken = some_taken;
6829                         sctp_free_a_chunk(stcb, chk);
6830                         *bail = 1;
6831                         to_move = 0;
6832                         goto out_of;
6833                 }
6834 #ifdef SCTP_MBUF_LOGGING
6835                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6836                         struct mbuf *mat;
6837
6838                         mat = chk->data;
6839                         while (mat) {
6840                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6841                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6842                                 }
6843                                 mat = SCTP_BUF_NEXT(mat);
6844                         }
6845                 }
6846 #endif
6847                 /* Pull off the data */
6848                 m_adj(sp->data, to_move);
6849                 /* Now lets work our way down and compact it */
6850                 m = sp->data;
6851                 while (m && (SCTP_BUF_LEN(m) == 0)) {
6852                         sp->data = SCTP_BUF_NEXT(m);
6853                         SCTP_BUF_NEXT(m) = NULL;
6854                         if (sp->tail_mbuf == m) {
6855                                 /*-
6856                                  * Freeing tail? TSNH since
6857                                  * we supposedly were taking less
6858                                  * than the sp->length.
6859                                  */
6860 #ifdef INVARIANTS
6861                                 panic("Huh, freing tail? - TSNH");
6862 #else
6863                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
6864                                 sp->tail_mbuf = sp->data = NULL;
6865                                 sp->length = 0;
6866 #endif
6867
6868                         }
6869                         sctp_m_free(m);
6870                         m = sp->data;
6871                 }
6872         }
6873         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
6874                 chk->copy_by_ref = 1;
6875         } else {
6876                 chk->copy_by_ref = 0;
6877         }
6878         /*
6879          * get last_mbuf and counts of mb useage This is ugly but hopefully
6880          * its only one mbuf.
6881          */
6882         if (chk->last_mbuf == NULL) {
6883                 chk->last_mbuf = chk->data;
6884                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
6885                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
6886                 }
6887         }
6888         if (to_move > length) {
6889                 /*- This should not happen either
6890                  * since we always lower to_move to the size
6891                  * of sp->length if its larger.
6892                  */
6893 #ifdef INVARIANTS
6894                 panic("Huh, how can to_move be larger?");
6895 #else
6896                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
6897                 sp->length = 0;
6898 #endif
6899         } else {
6900                 atomic_subtract_int(&sp->length, to_move);
6901         }
6902         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
6903                 /* Not enough room for a chunk header, get some */
6904                 struct mbuf *m;
6905
6906                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
6907                 if (m == NULL) {
6908                         /*
6909                          * we're in trouble here. _PREPEND below will free
6910                          * all the data if there is no leading space, so we
6911                          * must put the data back and restore.
6912                          */
6913                         if (send_lock_up == 0) {
6914                                 SCTP_TCB_SEND_LOCK(stcb);
6915                                 send_lock_up = 1;
6916                         }
6917                         if (chk->data == NULL) {
6918                                 /* unsteal the data */
6919                                 sp->data = chk->data;
6920                                 sp->tail_mbuf = chk->last_mbuf;
6921                         } else {
6922                                 struct mbuf *m_tmp;
6923
6924                                 /* reassemble the data */
6925                                 m_tmp = sp->data;
6926                                 sp->data = chk->data;
6927                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
6928                         }
6929                         sp->some_taken = some_taken;
6930                         atomic_add_int(&sp->length, to_move);
6931                         chk->data = NULL;
6932                         *bail = 1;
6933                         sctp_free_a_chunk(stcb, chk);
6934                         to_move = 0;
6935                         goto out_of;
6936                 } else {
6937                         SCTP_BUF_LEN(m) = 0;
6938                         SCTP_BUF_NEXT(m) = chk->data;
6939                         chk->data = m;
6940                         M_ALIGN(chk->data, 4);
6941                 }
6942         }
6943         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
6944         if (chk->data == NULL) {
6945                 /* HELP, TSNH since we assured it would not above? */
6946 #ifdef INVARIANTS
6947                 panic("prepend failes HELP?");
6948 #else
6949                 SCTP_PRINTF("prepend fails HELP?\n");
6950                 sctp_free_a_chunk(stcb, chk);
6951 #endif
6952                 *bail = 1;
6953                 to_move = 0;
6954                 goto out_of;
6955         }
6956         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
6957         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
6958         chk->book_size_scale = 0;
6959         chk->sent = SCTP_DATAGRAM_UNSENT;
6960
6961         chk->flags = 0;
6962         chk->asoc = &stcb->asoc;
6963         chk->pad_inplace = 0;
6964         chk->no_fr_allowed = 0;
6965         chk->rec.data.stream_seq = sp->strseq;
6966         chk->rec.data.stream_number = sp->stream;
6967         chk->rec.data.payloadtype = sp->ppid;
6968         chk->rec.data.context = sp->context;
6969         chk->rec.data.doing_fast_retransmit = 0;
6970
6971         chk->rec.data.timetodrop = sp->ts;
6972         chk->flags = sp->act_flags;
6973
6974         if (sp->net) {
6975                 chk->whoTo = sp->net;
6976                 atomic_add_int(&chk->whoTo->ref_count, 1);
6977         } else
6978                 chk->whoTo = NULL;
6979
6980         if (sp->holds_key_ref) {
6981                 chk->auth_keyid = sp->auth_keyid;
6982                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
6983                 chk->holds_key_ref = 1;
6984         }
6985         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
6986         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
6987                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
6988                     (uintptr_t) stcb, sp->length,
6989                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
6990                     chk->rec.data.TSN_seq);
6991         }
6992         dchkh = mtod(chk->data, struct sctp_data_chunk *);
6993         /*
6994          * Put the rest of the things in place now. Size was done earlier in
6995          * previous loop prior to padding.
6996          */
6997
6998 #ifdef SCTP_ASOCLOG_OF_TSNS
6999         SCTP_TCB_LOCK_ASSERT(stcb);
7000         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7001                 asoc->tsn_out_at = 0;
7002                 asoc->tsn_out_wrapped = 1;
7003         }
7004         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7005         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7006         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7007         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7008         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7009         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7010         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7011         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7012         asoc->tsn_out_at++;
7013 #endif
7014
7015         dchkh->ch.chunk_type = SCTP_DATA;
7016         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7017         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7018         dchkh->dp.stream_id = htons(strq->stream_no);
7019         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7020         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7021         dchkh->ch.chunk_length = htons(chk->send_size);
7022         /* Now advance the chk->send_size by the actual pad needed. */
7023         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7024                 /* need a pad */
7025                 struct mbuf *lm;
7026                 int pads;
7027
7028                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7029                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7030                         chk->pad_inplace = 1;
7031                 }
7032                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7033                         /* pad added an mbuf */
7034                         chk->last_mbuf = lm;
7035                 }
7036                 chk->send_size += pads;
7037         }
7038         /* We only re-set the policy if it is on */
7039         if (sp->pr_sctp_on) {
7040                 sctp_set_prsctp_policy(sp);
7041                 asoc->pr_sctp_cnt++;
7042                 chk->pr_sctp_on = 1;
7043         } else {
7044                 chk->pr_sctp_on = 0;
7045         }
7046         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7047                 /* All done pull and kill the message */
7048                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7049                 if (sp->put_last_out == 0) {
7050                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7051                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7052                             sp->sender_all_done,
7053                             sp->length,
7054                             sp->msg_is_complete,
7055                             sp->put_last_out,
7056                             send_lock_up);
7057                 }
7058                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7059                         SCTP_TCB_SEND_LOCK(stcb);
7060                         send_lock_up = 1;
7061                 }
7062                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7063                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7064                 if (sp->net) {
7065                         sctp_free_remote_addr(sp->net);
7066                         sp->net = NULL;
7067                 }
7068                 if (sp->data) {
7069                         sctp_m_freem(sp->data);
7070                         sp->data = NULL;
7071                 }
7072                 sctp_free_a_strmoq(stcb, sp);
7073
7074                 /* we can't be locked to it */
7075                 *locked = 0;
7076                 stcb->asoc.locked_on_sending = NULL;
7077         } else {
7078                 /* more to go, we are locked */
7079                 *locked = 1;
7080         }
7081         asoc->chunks_on_out_queue++;
7082         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7083         asoc->send_queue_cnt++;
7084 out_of:
7085         if (send_lock_up) {
7086                 SCTP_TCB_SEND_UNLOCK(stcb);
7087                 send_lock_up = 0;
7088         }
7089         return (to_move);
7090 }
7091
7092
7093 static void
7094 sctp_fill_outqueue(struct sctp_tcb *stcb,
7095     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
7096 {
7097         struct sctp_association *asoc;
7098         struct sctp_stream_out *strq, *strqn;
7099         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7100         int locked, giveup;
7101
7102         SCTP_TCB_LOCK_ASSERT(stcb);
7103         asoc = &stcb->asoc;
7104 #ifdef INET6
7105         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7106                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7107         } else {
7108                 /* ?? not sure what else to do */
7109                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7110         }
7111 #else
7112         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7113 #endif
7114         /* Need an allowance for the data chunk header too */
7115         goal_mtu -= sizeof(struct sctp_data_chunk);
7116
7117         /* must make even word boundary */
7118         goal_mtu &= 0xfffffffc;
7119         if (asoc->locked_on_sending) {
7120                 /* We are stuck on one stream until the message completes. */
7121                 strq = asoc->locked_on_sending;
7122                 locked = 1;
7123         } else {
7124                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7125                 locked = 0;
7126         }
7127         strqn = strq;
7128         while ((goal_mtu > 0) && strq) {
7129                 giveup = 0;
7130                 bail = 0;
7131                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7132                     &giveup, eeor_mode, &bail);
7133                 if (moved_how_much)
7134                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7135
7136                 if (locked) {
7137                         asoc->locked_on_sending = strq;
7138                         if ((moved_how_much == 0) || (giveup) || bail)
7139                                 /* no more to move for now */
7140                                 break;
7141                 } else {
7142                         asoc->locked_on_sending = NULL;
7143                         if ((giveup) || bail) {
7144                                 break;
7145                         }
7146                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7147                         if (strq == NULL) {
7148                                 break;
7149                         }
7150                 }
7151                 total_moved += moved_how_much;
7152                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7153                 goal_mtu &= 0xfffffffc;
7154         }
7155         if (bail)
7156                 *quit_now = 1;
7157
7158         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7159
7160         if (total_moved == 0) {
7161                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7162                     (net == stcb->asoc.primary_destination)) {
7163                         /* ran dry for primary network net */
7164                         SCTP_STAT_INCR(sctps_primary_randry);
7165                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7166                         /* ran dry with CMT on */
7167                         SCTP_STAT_INCR(sctps_cmt_randry);
7168                 }
7169         }
7170 }
7171
7172 void
7173 sctp_fix_ecn_echo(struct sctp_association *asoc)
7174 {
7175         struct sctp_tmit_chunk *chk;
7176
7177         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7178                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7179                         chk->sent = SCTP_DATAGRAM_UNSENT;
7180                 }
7181         }
7182 }
7183
7184 void
7185 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7186 {
7187         struct sctp_association *asoc;
7188         struct sctp_tmit_chunk *chk;
7189         struct sctp_stream_queue_pending *sp;
7190         unsigned int i;
7191
7192         if (net == NULL) {
7193                 return;
7194         }
7195         asoc = &stcb->asoc;
7196         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7197                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7198                         if (sp->net == net) {
7199                                 sctp_free_remote_addr(sp->net);
7200                                 sp->net = NULL;
7201                         }
7202                 }
7203         }
7204         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7205                 if (chk->whoTo == net) {
7206                         sctp_free_remote_addr(chk->whoTo);
7207                         chk->whoTo = NULL;
7208                 }
7209         }
7210 }
7211
7212 int
7213 sctp_med_chunk_output(struct sctp_inpcb *inp,
7214     struct sctp_tcb *stcb,
7215     struct sctp_association *asoc,
7216     int *num_out,
7217     int *reason_code,
7218     int control_only, int from_where,
7219     struct timeval *now, int *now_filled, int frag_point, int so_locked
7220 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7221     SCTP_UNUSED
7222 #endif
7223 )
7224 {
7225         /*
7226          * Ok this is the generic chunk service queue. we must do the
7227          * following: - Service the stream queue that is next, moving any
7228          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7229          * LAST to the out queue in one pass) and assigning TSN's - Check to
7230          * see if the cwnd/rwnd allows any output, if so we go ahead and
7231          * fomulate and send the low level chunks. Making sure to combine
7232          * any control in the control chunk queue also.
7233          */
7234         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7235         struct mbuf *outchain, *endoutchain;
7236         struct sctp_tmit_chunk *chk, *nchk;
7237
7238         /* temp arrays for unlinking */
7239         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7240         int no_fragmentflg, error;
7241         unsigned int max_rwnd_per_dest, max_send_per_dest;
7242         int one_chunk, hbflag, skip_data_for_this_net;
7243         int asconf, cookie, no_out_cnt;
7244         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7245         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7246         int tsns_sent = 0;
7247         uint32_t auth_offset = 0;
7248         struct sctp_auth_chunk *auth = NULL;
7249         uint16_t auth_keyid;
7250         int override_ok = 1;
7251         int data_auth_reqd = 0;
7252
7253         /*
7254          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7255          * destination.
7256          */
7257         int pf_hbflag = 0;
7258         int quit_now = 0;
7259
7260         *num_out = 0;
7261         auth_keyid = stcb->asoc.authinfo.active_keyid;
7262
7263         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7264             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7265             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7266                 eeor_mode = 1;
7267         } else {
7268                 eeor_mode = 0;
7269         }
7270         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7271         /*
7272          * First lets prime the pump. For each destination, if there is room
7273          * in the flight size, attempt to pull an MTU's worth out of the
7274          * stream queues into the general send_queue
7275          */
7276 #ifdef SCTP_AUDITING_ENABLED
7277         sctp_audit_log(0xC2, 2);
7278 #endif
7279         SCTP_TCB_LOCK_ASSERT(stcb);
7280         hbflag = 0;
7281         if ((control_only) || (asoc->stream_reset_outstanding))
7282                 no_data_chunks = 1;
7283         else
7284                 no_data_chunks = 0;
7285
7286         /* Nothing to possible to send? */
7287         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7288             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7289             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7290             TAILQ_EMPTY(&asoc->send_queue) &&
7291             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7292 nothing_to_send:
7293                 *reason_code = 9;
7294                 return (0);
7295         }
7296         if (asoc->peers_rwnd == 0) {
7297                 /* No room in peers rwnd */
7298                 *reason_code = 1;
7299                 if (asoc->total_flight > 0) {
7300                         /* we are allowed one chunk in flight */
7301                         no_data_chunks = 1;
7302                 }
7303         }
7304         if (stcb->asoc.ecn_echo_cnt_onq) {
7305                 /* Record where a sack goes, if any */
7306                 if (no_data_chunks &&
7307                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7308                         /* Nothing but ECNe to send - we don't do that */
7309                         goto nothing_to_send;
7310                 }
7311                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7312                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7313                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7314                                 sack_goes_to = chk->whoTo;
7315                                 break;
7316                         }
7317                 }
7318         }
7319         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7320         if (stcb->sctp_socket)
7321                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7322         else
7323                 max_send_per_dest = 0;
7324         if ((no_data_chunks == 0) &&
7325             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7326                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7327                         /*
7328                          * This for loop we are in takes in each net, if
7329                          * its's got space in cwnd and has data sent to it
7330                          * (when CMT is off) then it calls
7331                          * sctp_fill_outqueue for the net. This gets data on
7332                          * the send queue for that network.
7333                          *
7334                          * In sctp_fill_outqueue TSN's are assigned and data is
7335                          * copied out of the stream buffers. Note mostly
7336                          * copy by reference (we hope).
7337                          */
7338                         net->window_probe = 0;
7339                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ||
7340                             (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
7341                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7342                                         sctp_log_cwnd(stcb, net, 1,
7343                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7344                                 }
7345                                 continue;
7346                         }
7347                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7348                             (net->flight_size == 0)) {
7349                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7350                         }
7351                         if ((asoc->sctp_cmt_on_off == 0) &&
7352                             (asoc->primary_destination != net) &&
7353                             (net->ref_count < 2)) {
7354                                 /* nothing can be in queue for this guy */
7355                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7356                                         sctp_log_cwnd(stcb, net, 2,
7357                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7358                                 }
7359                                 continue;
7360                         }
7361                         if (net->flight_size >= net->cwnd) {
7362                                 /* skip this network, no room - can't fill */
7363                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7364                                         sctp_log_cwnd(stcb, net, 3,
7365                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7366                                 }
7367                                 continue;
7368                         }
7369                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7370                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7371                         }
7372                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
7373                         if (quit_now) {
7374                                 /* memory alloc failure */
7375                                 no_data_chunks = 1;
7376                                 break;
7377                         }
7378                 }
7379         }
7380         /* now service each destination and send out what we can for it */
7381         /* Nothing to send? */
7382         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7383             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7384             TAILQ_EMPTY(&asoc->send_queue)) {
7385                 *reason_code = 8;
7386                 return (0);
7387         }
7388         if (asoc->sctp_cmt_on_off > 0) {
7389                 /* get the last start point */
7390                 start_at = asoc->last_net_cmt_send_started;
7391                 if (start_at == NULL) {
7392                         /* null so to beginning */
7393                         start_at = TAILQ_FIRST(&asoc->nets);
7394                 } else {
7395                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7396                         if (start_at == NULL) {
7397                                 start_at = TAILQ_FIRST(&asoc->nets);
7398                         }
7399                 }
7400                 asoc->last_net_cmt_send_started = start_at;
7401         } else {
7402                 start_at = TAILQ_FIRST(&asoc->nets);
7403         }
7404         old_start_at = NULL;
7405 again_one_more_time:
7406         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7407                 /* how much can we send? */
7408                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7409                 if (old_start_at && (old_start_at == net)) {
7410                         /* through list ocmpletely. */
7411                         break;
7412                 }
7413                 tsns_sent = 0xa;
7414                 if ((asoc->sctp_cmt_on_off == 0) &&
7415                     (asoc->primary_destination != net) &&
7416                     (net->ref_count < 2)) {
7417                         /*
7418                          * Ref-count of 1 so we cannot have data or control
7419                          * queued to this address. Skip it (non-CMT).
7420                          */
7421                         continue;
7422                 }
7423                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7424                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7425                     (net->flight_size >= net->cwnd)) {
7426                         /*
7427                          * Nothing on control or asconf and flight is full,
7428                          * we can skip even in the CMT case.
7429                          */
7430                         continue;
7431                 }
7432                 ctl_cnt = bundle_at = 0;
7433                 endoutchain = outchain = NULL;
7434                 no_fragmentflg = 1;
7435                 one_chunk = 0;
7436                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7437                         skip_data_for_this_net = 1;
7438                 } else {
7439                         skip_data_for_this_net = 0;
7440                 }
7441                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7442                         /*
7443                          * if we have a route and an ifp check to see if we
7444                          * have room to send to this guy
7445                          */
7446                         struct ifnet *ifp;
7447
7448                         ifp = net->ro.ro_rt->rt_ifp;
7449                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7450                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7451                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7452                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7453                                 }
7454                                 continue;
7455                         }
7456                 }
7457                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7458                 case AF_INET:
7459                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7460                         break;
7461 #ifdef INET6
7462                 case AF_INET6:
7463                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7464                         break;
7465 #endif
7466                 default:
7467                         /* TSNH */
7468                         mtu = net->mtu;
7469                         break;
7470                 }
7471                 mx_mtu = mtu;
7472                 to_out = 0;
7473                 if (mtu > asoc->peers_rwnd) {
7474                         if (asoc->total_flight > 0) {
7475                                 /* We have a packet in flight somewhere */
7476                                 r_mtu = asoc->peers_rwnd;
7477                         } else {
7478                                 /* We are always allowed to send one MTU out */
7479                                 one_chunk = 1;
7480                                 r_mtu = mtu;
7481                         }
7482                 } else {
7483                         r_mtu = mtu;
7484                 }
7485                 /************************/
7486                 /* ASCONF transmission */
7487                 /************************/
7488                 /* Now first lets go through the asconf queue */
7489                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7490                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7491                                 continue;
7492                         }
7493                         if (chk->whoTo != net) {
7494                                 /*
7495                                  * No, not sent to the network we are
7496                                  * looking at
7497                                  */
7498                                 break;
7499                         }
7500                         if (chk->data == NULL) {
7501                                 break;
7502                         }
7503                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7504                             chk->sent != SCTP_DATAGRAM_RESEND) {
7505                                 break;
7506                         }
7507                         /*
7508                          * if no AUTH is yet included and this chunk
7509                          * requires it, make sure to account for it.  We
7510                          * don't apply the size until the AUTH chunk is
7511                          * actually added below in case there is no room for
7512                          * this chunk. NOTE: we overload the use of "omtu"
7513                          * here
7514                          */
7515                         if ((auth == NULL) &&
7516                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7517                             stcb->asoc.peer_auth_chunks)) {
7518                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7519                         } else
7520                                 omtu = 0;
7521                         /* Here we do NOT factor the r_mtu */
7522                         if ((chk->send_size < (int)(mtu - omtu)) ||
7523                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7524                                 /*
7525                                  * We probably should glom the mbuf chain
7526                                  * from the chk->data for control but the
7527                                  * problem is it becomes yet one more level
7528                                  * of tracking to do if for some reason
7529                                  * output fails. Then I have got to
7530                                  * reconstruct the merged control chain.. el
7531                                  * yucko.. for now we take the easy way and
7532                                  * do the copy
7533                                  */
7534                                 /*
7535                                  * Add an AUTH chunk, if chunk requires it
7536                                  * save the offset into the chain for AUTH
7537                                  */
7538                                 if ((auth == NULL) &&
7539                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7540                                     stcb->asoc.peer_auth_chunks))) {
7541                                         outchain = sctp_add_auth_chunk(outchain,
7542                                             &endoutchain,
7543                                             &auth,
7544                                             &auth_offset,
7545                                             stcb,
7546                                             chk->rec.chunk_id.id);
7547                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7548                                 }
7549                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7550                                     (int)chk->rec.chunk_id.can_take_data,
7551                                     chk->send_size, chk->copy_by_ref);
7552                                 if (outchain == NULL) {
7553                                         *reason_code = 8;
7554                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7555                                         return (ENOMEM);
7556                                 }
7557                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7558                                 /* update our MTU size */
7559                                 if (mtu > (chk->send_size + omtu))
7560                                         mtu -= (chk->send_size + omtu);
7561                                 else
7562                                         mtu = 0;
7563                                 to_out += (chk->send_size + omtu);
7564                                 /* Do clear IP_DF ? */
7565                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7566                                         no_fragmentflg = 0;
7567                                 }
7568                                 if (chk->rec.chunk_id.can_take_data)
7569                                         chk->data = NULL;
7570                                 /*
7571                                  * set hb flag since we can use these for
7572                                  * RTO
7573                                  */
7574                                 hbflag = 1;
7575                                 asconf = 1;
7576                                 /*
7577                                  * should sysctl this: don't bundle data
7578                                  * with ASCONF since it requires AUTH
7579                                  */
7580                                 no_data_chunks = 1;
7581                                 chk->sent = SCTP_DATAGRAM_SENT;
7582                                 chk->snd_count++;
7583                                 if (mtu == 0) {
7584                                         /*
7585                                          * Ok we are out of room but we can
7586                                          * output without effecting the
7587                                          * flight size since this little guy
7588                                          * is a control only packet.
7589                                          */
7590                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7591                                         /*
7592                                          * do NOT clear the asconf flag as
7593                                          * it is used to do appropriate
7594                                          * source address selection.
7595                                          */
7596                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7597                                             (struct sockaddr *)&net->ro._l_addr,
7598                                             outchain, auth_offset, auth,
7599                                             stcb->asoc.authinfo.active_keyid,
7600                                             no_fragmentflg, 0, NULL, asconf,
7601                                             inp->sctp_lport, stcb->rport,
7602                                             htonl(stcb->asoc.peer_vtag),
7603                                             net->port, so_locked, NULL, NULL))) {
7604                                                 if (error == ENOBUFS) {
7605                                                         asoc->ifp_had_enobuf = 1;
7606                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7607                                                 }
7608                                                 if (from_where == 0) {
7609                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7610                                                 }
7611                                                 if (*now_filled == 0) {
7612                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7613                                                         *now_filled = 1;
7614                                                         *now = net->last_sent_time;
7615                                                 } else {
7616                                                         net->last_sent_time = *now;
7617                                                 }
7618                                                 hbflag = 0;
7619                                                 /* error, could not output */
7620                                                 if (error == EHOSTUNREACH) {
7621                                                         /*
7622                                                          * Destination went
7623                                                          * unreachable
7624                                                          * during this send
7625                                                          */
7626                                                         sctp_move_chunks_from_net(stcb, net);
7627                                                 }
7628                                                 *reason_code = 7;
7629                                                 continue;
7630                                         } else
7631                                                 asoc->ifp_had_enobuf = 0;
7632                                         if (*now_filled == 0) {
7633                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7634                                                 *now_filled = 1;
7635                                                 *now = net->last_sent_time;
7636                                         } else {
7637                                                 net->last_sent_time = *now;
7638                                         }
7639                                         hbflag = 0;
7640                                         /*
7641                                          * increase the number we sent, if a
7642                                          * cookie is sent we don't tell them
7643                                          * any was sent out.
7644                                          */
7645                                         outchain = endoutchain = NULL;
7646                                         auth = NULL;
7647                                         auth_offset = 0;
7648                                         if (!no_out_cnt)
7649                                                 *num_out += ctl_cnt;
7650                                         /* recalc a clean slate and setup */
7651                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7652                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7653                                         } else {
7654                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7655                                         }
7656                                         to_out = 0;
7657                                         no_fragmentflg = 1;
7658                                 }
7659                         }
7660                 }
7661                 /************************/
7662                 /* Control transmission */
7663                 /************************/
7664                 /* Now first lets go through the control queue */
7665                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7666                         if ((sack_goes_to) &&
7667                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
7668                             (chk->whoTo != sack_goes_to)) {
7669                                 /*
7670                                  * if we have a sack in queue, and we are
7671                                  * looking at an ecn echo that is NOT queued
7672                                  * to where the sack is going..
7673                                  */
7674                                 if (chk->whoTo == net) {
7675                                         /*
7676                                          * Don't transmit it to where its
7677                                          * going (current net)
7678                                          */
7679                                         continue;
7680                                 } else if (sack_goes_to == net) {
7681                                         /*
7682                                          * But do transmit it to this
7683                                          * address
7684                                          */
7685                                         goto skip_net_check;
7686                                 }
7687                         }
7688                         if (chk->whoTo != net) {
7689                                 /*
7690                                  * No, not sent to the network we are
7691                                  * looking at
7692                                  */
7693                                 continue;
7694                         }
7695         skip_net_check:
7696                         if (chk->data == NULL) {
7697                                 continue;
7698                         }
7699                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
7700                                 /*
7701                                  * It must be unsent. Cookies and ASCONF's
7702                                  * hang around but there timers will force
7703                                  * when marked for resend.
7704                                  */
7705                                 continue;
7706                         }
7707                         /*
7708                          * if no AUTH is yet included and this chunk
7709                          * requires it, make sure to account for it.  We
7710                          * don't apply the size until the AUTH chunk is
7711                          * actually added below in case there is no room for
7712                          * this chunk. NOTE: we overload the use of "omtu"
7713                          * here
7714                          */
7715                         if ((auth == NULL) &&
7716                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7717                             stcb->asoc.peer_auth_chunks)) {
7718                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7719                         } else
7720                                 omtu = 0;
7721                         /* Here we do NOT factor the r_mtu */
7722                         if ((chk->send_size <= (int)(mtu - omtu)) ||
7723                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7724                                 /*
7725                                  * We probably should glom the mbuf chain
7726                                  * from the chk->data for control but the
7727                                  * problem is it becomes yet one more level
7728                                  * of tracking to do if for some reason
7729                                  * output fails. Then I have got to
7730                                  * reconstruct the merged control chain.. el
7731                                  * yucko.. for now we take the easy way and
7732                                  * do the copy
7733                                  */
7734                                 /*
7735                                  * Add an AUTH chunk, if chunk requires it
7736                                  * save the offset into the chain for AUTH
7737                                  */
7738                                 if ((auth == NULL) &&
7739                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7740                                     stcb->asoc.peer_auth_chunks))) {
7741                                         outchain = sctp_add_auth_chunk(outchain,
7742                                             &endoutchain,
7743                                             &auth,
7744                                             &auth_offset,
7745                                             stcb,
7746                                             chk->rec.chunk_id.id);
7747                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7748                                 }
7749                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7750                                     (int)chk->rec.chunk_id.can_take_data,
7751                                     chk->send_size, chk->copy_by_ref);
7752                                 if (outchain == NULL) {
7753                                         *reason_code = 8;
7754                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7755                                         return (ENOMEM);
7756                                 }
7757                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7758                                 /* update our MTU size */
7759                                 if (mtu > (chk->send_size + omtu))
7760                                         mtu -= (chk->send_size + omtu);
7761                                 else
7762                                         mtu = 0;
7763                                 to_out += (chk->send_size + omtu);
7764                                 /* Do clear IP_DF ? */
7765                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7766                                         no_fragmentflg = 0;
7767                                 }
7768                                 if (chk->rec.chunk_id.can_take_data)
7769                                         chk->data = NULL;
7770                                 /* Mark things to be removed, if needed */
7771                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7772                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7773                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7774                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7775                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7776                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7777                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7778                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7779                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7780                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7781                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7782
7783                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
7784                                                 hbflag = 1;
7785                                                 /*
7786                                                  * JRS 5/14/07 - Set the
7787                                                  * flag to say a heartbeat
7788                                                  * is being sent.
7789                                                  */
7790                                                 pf_hbflag = 1;
7791                                         }
7792                                         /* remove these chunks at the end */
7793                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7794                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7795                                                 /* turn off the timer */
7796                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
7797                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
7798                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
7799                                                 }
7800                                         }
7801                                         ctl_cnt++;
7802                                 } else {
7803                                         /*
7804                                          * Other chunks, since they have
7805                                          * timers running (i.e. COOKIE) we
7806                                          * just "trust" that it gets sent or
7807                                          * retransmitted.
7808                                          */
7809                                         ctl_cnt++;
7810                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
7811                                                 cookie = 1;
7812                                                 no_out_cnt = 1;
7813                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7814                                                 /*
7815                                                  * Increment ecne send count
7816                                                  * here this means we may be
7817                                                  * over-zealous in our
7818                                                  * counting if the send
7819                                                  * fails, but its the best
7820                                                  * place to do it (we used
7821                                                  * to do it in the queue of
7822                                                  * the chunk, but that did
7823                                                  * not tell how many times
7824                                                  * it was sent.
7825                                                  */
7826                                                 SCTP_STAT_INCR(sctps_sendecne);
7827                                         }
7828                                         chk->sent = SCTP_DATAGRAM_SENT;
7829                                         chk->snd_count++;
7830                                 }
7831                                 if (mtu == 0) {
7832                                         /*
7833                                          * Ok we are out of room but we can
7834                                          * output without effecting the
7835                                          * flight size since this little guy
7836                                          * is a control only packet.
7837                                          */
7838                                         if (asconf) {
7839                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
7840                                                 /*
7841                                                  * do NOT clear the asconf
7842                                                  * flag as it is used to do
7843                                                  * appropriate source
7844                                                  * address selection.
7845                                                  */
7846                                         }
7847                                         if (cookie) {
7848                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
7849                                                 cookie = 0;
7850                                         }
7851                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
7852                                             (struct sockaddr *)&net->ro._l_addr,
7853                                             outchain,
7854                                             auth_offset, auth,
7855                                             stcb->asoc.authinfo.active_keyid,
7856                                             no_fragmentflg, 0, NULL, asconf,
7857                                             inp->sctp_lport, stcb->rport,
7858                                             htonl(stcb->asoc.peer_vtag),
7859                                             net->port, so_locked, NULL, NULL))) {
7860                                                 if (error == ENOBUFS) {
7861                                                         asoc->ifp_had_enobuf = 1;
7862                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
7863                                                 }
7864                                                 if (from_where == 0) {
7865                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
7866                                                 }
7867                                                 /* error, could not output */
7868                                                 if (hbflag) {
7869                                                         if (*now_filled == 0) {
7870                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7871                                                                 *now_filled = 1;
7872                                                                 *now = net->last_sent_time;
7873                                                         } else {
7874                                                                 net->last_sent_time = *now;
7875                                                         }
7876                                                         hbflag = 0;
7877                                                 }
7878                                                 if (error == EHOSTUNREACH) {
7879                                                         /*
7880                                                          * Destination went
7881                                                          * unreachable
7882                                                          * during this send
7883                                                          */
7884                                                         sctp_move_chunks_from_net(stcb, net);
7885                                                 }
7886                                                 *reason_code = 7;
7887                                                 continue;
7888                                         } else
7889                                                 asoc->ifp_had_enobuf = 0;
7890                                         /* Only HB or ASCONF advances time */
7891                                         if (hbflag) {
7892                                                 if (*now_filled == 0) {
7893                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
7894                                                         *now_filled = 1;
7895                                                         *now = net->last_sent_time;
7896                                                 } else {
7897                                                         net->last_sent_time = *now;
7898                                                 }
7899                                                 hbflag = 0;
7900                                         }
7901                                         /*
7902                                          * increase the number we sent, if a
7903                                          * cookie is sent we don't tell them
7904                                          * any was sent out.
7905                                          */
7906                                         outchain = endoutchain = NULL;
7907                                         auth = NULL;
7908                                         auth_offset = 0;
7909                                         if (!no_out_cnt)
7910                                                 *num_out += ctl_cnt;
7911                                         /* recalc a clean slate and setup */
7912                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
7913                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
7914                                         } else {
7915                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
7916                                         }
7917                                         to_out = 0;
7918                                         no_fragmentflg = 1;
7919                                 }
7920                         }
7921                 }
7922                 /* JRI: if dest is in PF state, do not send data to it */
7923                 if ((asoc->sctp_cmt_on_off > 0) &&
7924                     (asoc->sctp_cmt_pf > 0) &&
7925                     (net->dest_state & SCTP_ADDR_PF)) {
7926                         goto no_data_fill;
7927                 }
7928                 if (net->flight_size >= net->cwnd) {
7929                         goto no_data_fill;
7930                 }
7931                 if ((asoc->sctp_cmt_on_off > 0) &&
7932                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
7933                     (net->flight_size > max_rwnd_per_dest)) {
7934                         goto no_data_fill;
7935                 }
7936                 /*
7937                  * We need a specific accounting for the usage of the send
7938                  * buffer. We also need to check the number of messages per
7939                  * net. For now, this is better than nothing and it disabled
7940                  * by default...
7941                  */
7942                 if ((asoc->sctp_cmt_on_off > 0) &&
7943                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
7944                     (max_send_per_dest > 0) &&
7945                     (net->flight_size > max_send_per_dest)) {
7946                         goto no_data_fill;
7947                 }
7948                 /*********************/
7949                 /* Data transmission */
7950                 /*********************/
7951                 /*
7952                  * if AUTH for DATA is required and no AUTH has been added
7953                  * yet, account for this in the mtu now... if no data can be
7954                  * bundled, this adjustment won't matter anyways since the
7955                  * packet will be going out...
7956                  */
7957                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
7958                     stcb->asoc.peer_auth_chunks);
7959                 if (data_auth_reqd && (auth == NULL)) {
7960                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7961                 }
7962                 /* now lets add any data within the MTU constraints */
7963                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7964                 case AF_INET:
7965                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
7966                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7967                         else
7968                                 omtu = 0;
7969                         break;
7970 #ifdef INET6
7971                 case AF_INET6:
7972                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
7973                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7974                         else
7975                                 omtu = 0;
7976                         break;
7977 #endif
7978                 default:
7979                         /* TSNH */
7980                         omtu = 0;
7981                         break;
7982                 }
7983                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
7984                     (skip_data_for_this_net == 0)) ||
7985                     (cookie)) {
7986                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
7987                                 if (no_data_chunks) {
7988                                         /* let only control go out */
7989                                         *reason_code = 1;
7990                                         break;
7991                                 }
7992                                 if (net->flight_size >= net->cwnd) {
7993                                         /* skip this net, no room for data */
7994                                         *reason_code = 2;
7995                                         break;
7996                                 }
7997                                 if ((chk->whoTo != NULL) &&
7998                                     (chk->whoTo != net)) {
7999                                         /* Don't send the chunk on this net */
8000                                         continue;
8001                                 }
8002                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8003                                         /*-
8004                                          * strange, we have a chunk that is
8005                                          * to big for its destination and
8006                                          * yet no fragment ok flag.
8007                                          * Something went wrong when the
8008                                          * PMTU changed...we did not mark
8009                                          * this chunk for some reason?? I
8010                                          * will fix it here by letting IP
8011                                          * fragment it for now and printing
8012                                          * a warning. This really should not
8013                                          * happen ...
8014                                          */
8015                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8016                                             chk->send_size, mtu);
8017                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8018                                 }
8019                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8020                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8021                                         struct sctp_data_chunk *dchkh;
8022
8023                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8024                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8025                                 }
8026                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8027                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8028                                         /* ok we will add this one */
8029
8030                                         /*
8031                                          * Add an AUTH chunk, if chunk
8032                                          * requires it, save the offset into
8033                                          * the chain for AUTH
8034                                          */
8035                                         if (data_auth_reqd) {
8036                                                 if (auth == NULL) {
8037                                                         outchain = sctp_add_auth_chunk(outchain,
8038                                                             &endoutchain,
8039                                                             &auth,
8040                                                             &auth_offset,
8041                                                             stcb,
8042                                                             SCTP_DATA);
8043                                                         auth_keyid = chk->auth_keyid;
8044                                                         override_ok = 0;
8045                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8046                                                 } else if (override_ok) {
8047                                                         /*
8048                                                          * use this data's
8049                                                          * keyid
8050                                                          */
8051                                                         auth_keyid = chk->auth_keyid;
8052                                                         override_ok = 0;
8053                                                 } else if (auth_keyid != chk->auth_keyid) {
8054                                                         /*
8055                                                          * different keyid,
8056                                                          * so done bundling
8057                                                          */
8058                                                         break;
8059                                                 }
8060                                         }
8061                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8062                                             chk->send_size, chk->copy_by_ref);
8063                                         if (outchain == NULL) {
8064                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8065                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8066                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8067                                                 }
8068                                                 *reason_code = 3;
8069                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8070                                                 return (ENOMEM);
8071                                         }
8072                                         /* upate our MTU size */
8073                                         /* Do clear IP_DF ? */
8074                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8075                                                 no_fragmentflg = 0;
8076                                         }
8077                                         /* unsigned subtraction of mtu */
8078                                         if (mtu > chk->send_size)
8079                                                 mtu -= chk->send_size;
8080                                         else
8081                                                 mtu = 0;
8082                                         /* unsigned subtraction of r_mtu */
8083                                         if (r_mtu > chk->send_size)
8084                                                 r_mtu -= chk->send_size;
8085                                         else
8086                                                 r_mtu = 0;
8087
8088                                         to_out += chk->send_size;
8089                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8090 #ifdef INVARIANTS
8091                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8092 #else
8093                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8094                                                     mx_mtu, to_out);
8095 #endif
8096                                         }
8097                                         chk->window_probe = 0;
8098                                         data_list[bundle_at++] = chk;
8099                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8100                                                 mtu = 0;
8101                                                 break;
8102                                         }
8103                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8104                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8105                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8106                                                 } else {
8107                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8108                                                 }
8109                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8110                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8111                                                         /*
8112                                                          * Count number of
8113                                                          * user msg's that
8114                                                          * were fragmented
8115                                                          * we do this by
8116                                                          * counting when we
8117                                                          * see a LAST
8118                                                          * fragment only.
8119                                                          */
8120                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8121                                         }
8122                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8123                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8124                                                         data_list[0]->window_probe = 1;
8125                                                         net->window_probe = 1;
8126                                                 }
8127                                                 break;
8128                                         }
8129                                 } else {
8130                                         /*
8131                                          * Must be sent in order of the
8132                                          * TSN's (on a network)
8133                                          */
8134                                         break;
8135                                 }
8136                         }       /* for (chunk gather loop for this net) */
8137                 }               /* if asoc.state OPEN */
8138 no_data_fill:
8139                 /* Is there something to send for this destination? */
8140                 if (outchain) {
8141                         /* We may need to start a control timer or two */
8142                         if (asconf) {
8143                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8144                                     stcb, net);
8145                                 /*
8146                                  * do NOT clear the asconf flag as it is
8147                                  * used to do appropriate source address
8148                                  * selection.
8149                                  */
8150                         }
8151                         if (cookie) {
8152                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8153                                 cookie = 0;
8154                         }
8155                         /* must start a send timer if data is being sent */
8156                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8157                                 /*
8158                                  * no timer running on this destination
8159                                  * restart it.
8160                                  */
8161                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8162                         } else if ((asoc->sctp_cmt_on_off > 0) &&
8163                                     (asoc->sctp_cmt_pf > 0) &&
8164                                     pf_hbflag &&
8165                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
8166                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8167                                 /*
8168                                  * JRS 5/14/07 - If a HB has been sent to a
8169                                  * PF destination and no T3 timer is
8170                                  * currently running, start the T3 timer to
8171                                  * track the HBs that were sent.
8172                                  */
8173                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8174                         }
8175                         /* Now send it, if there is anything to send :> */
8176                         if ((error = sctp_lowlevel_chunk_output(inp,
8177                             stcb,
8178                             net,
8179                             (struct sockaddr *)&net->ro._l_addr,
8180                             outchain,
8181                             auth_offset,
8182                             auth,
8183                             auth_keyid,
8184                             no_fragmentflg,
8185                             bundle_at,
8186                             data_list[0],
8187                             asconf,
8188                             inp->sctp_lport, stcb->rport,
8189                             htonl(stcb->asoc.peer_vtag),
8190                             net->port, so_locked, NULL, NULL))) {
8191                                 /* error, we could not output */
8192                                 if (error == ENOBUFS) {
8193                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8194                                         asoc->ifp_had_enobuf = 1;
8195                                 }
8196                                 if (from_where == 0) {
8197                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8198                                 }
8199                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8200                                 if (hbflag) {
8201                                         if (*now_filled == 0) {
8202                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8203                                                 *now_filled = 1;
8204                                                 *now = net->last_sent_time;
8205                                         } else {
8206                                                 net->last_sent_time = *now;
8207                                         }
8208                                         hbflag = 0;
8209                                 }
8210                                 if (error == EHOSTUNREACH) {
8211                                         /*
8212                                          * Destination went unreachable
8213                                          * during this send
8214                                          */
8215                                         sctp_move_chunks_from_net(stcb, net);
8216                                 }
8217                                 *reason_code = 6;
8218                                 /*-
8219                                  * I add this line to be paranoid. As far as
8220                                  * I can tell the continue, takes us back to
8221                                  * the top of the for, but just to make sure
8222                                  * I will reset these again here.
8223                                  */
8224                                 ctl_cnt = bundle_at = 0;
8225                                 continue;       /* This takes us back to the
8226                                                  * for() for the nets. */
8227                         } else {
8228                                 asoc->ifp_had_enobuf = 0;
8229                         }
8230                         outchain = endoutchain = NULL;
8231                         auth = NULL;
8232                         auth_offset = 0;
8233                         if (bundle_at || hbflag) {
8234                                 /* For data/asconf and hb set time */
8235                                 if (*now_filled == 0) {
8236                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8237                                         *now_filled = 1;
8238                                         *now = net->last_sent_time;
8239                                 } else {
8240                                         net->last_sent_time = *now;
8241                                 }
8242                         }
8243                         if (!no_out_cnt) {
8244                                 *num_out += (ctl_cnt + bundle_at);
8245                         }
8246                         if (bundle_at) {
8247                                 /* setup for a RTO measurement */
8248                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8249                                 /* fill time if not already filled */
8250                                 if (*now_filled == 0) {
8251                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8252                                         *now_filled = 1;
8253                                         *now = asoc->time_last_sent;
8254                                 } else {
8255                                         asoc->time_last_sent = *now;
8256                                 }
8257                                 if (net->rto_needed) {
8258                                         data_list[0]->do_rtt = 1;
8259                                         net->rto_needed = 0;
8260                                 }
8261                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8262                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8263                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
8264                                         if (net->flight_size < net->cwnd) {
8265                                                 /* start or restart it */
8266                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8267                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8268                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
8269                                                 }
8270                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
8271                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
8272                                         } else {
8273                                                 /* stop it if its running */
8274                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
8275                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
8276                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
8277                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
8278                                                 }
8279                                         }
8280                                 }
8281                         }
8282                         if (one_chunk) {
8283                                 break;
8284                         }
8285                 }
8286                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8287                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8288                 }
8289         }
8290         if (old_start_at == NULL) {
8291                 old_start_at = start_at;
8292                 start_at = TAILQ_FIRST(&asoc->nets);
8293                 if (old_start_at)
8294                         goto again_one_more_time;
8295         }
8296         /*
8297          * At the end there should be no NON timed chunks hanging on this
8298          * queue.
8299          */
8300         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8301                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8302         }
8303         if ((*num_out == 0) && (*reason_code == 0)) {
8304                 *reason_code = 4;
8305         } else {
8306                 *reason_code = 5;
8307         }
8308         sctp_clean_up_ctl(stcb, asoc);
8309         return (0);
8310 }
8311
8312 void
8313 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8314 {
8315         /*-
8316          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8317          * the control chunk queue.
8318          */
8319         struct sctp_chunkhdr *hdr;
8320         struct sctp_tmit_chunk *chk;
8321         struct mbuf *mat;
8322
8323         SCTP_TCB_LOCK_ASSERT(stcb);
8324         sctp_alloc_a_chunk(stcb, chk);
8325         if (chk == NULL) {
8326                 /* no memory */
8327                 sctp_m_freem(op_err);
8328                 return;
8329         }
8330         chk->copy_by_ref = 0;
8331         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8332         if (op_err == NULL) {
8333                 sctp_free_a_chunk(stcb, chk);
8334                 return;
8335         }
8336         chk->send_size = 0;
8337         mat = op_err;
8338         while (mat != NULL) {
8339                 chk->send_size += SCTP_BUF_LEN(mat);
8340                 mat = SCTP_BUF_NEXT(mat);
8341         }
8342         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8343         chk->rec.chunk_id.can_take_data = 1;
8344         chk->sent = SCTP_DATAGRAM_UNSENT;
8345         chk->snd_count = 0;
8346         chk->flags = 0;
8347         chk->asoc = &stcb->asoc;
8348         chk->data = op_err;
8349         chk->whoTo = chk->asoc->primary_destination;
8350         atomic_add_int(&chk->whoTo->ref_count, 1);
8351         hdr = mtod(op_err, struct sctp_chunkhdr *);
8352         hdr->chunk_type = SCTP_OPERATION_ERROR;
8353         hdr->chunk_flags = 0;
8354         hdr->chunk_length = htons(chk->send_size);
8355         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8356             chk,
8357             sctp_next);
8358         chk->asoc->ctrl_queue_cnt++;
8359 }
8360
8361 int
8362 sctp_send_cookie_echo(struct mbuf *m,
8363     int offset,
8364     struct sctp_tcb *stcb,
8365     struct sctp_nets *net)
8366 {
8367         /*-
8368          * pull out the cookie and put it at the front of the control chunk
8369          * queue.
8370          */
8371         int at;
8372         struct mbuf *cookie;
8373         struct sctp_paramhdr parm, *phdr;
8374         struct sctp_chunkhdr *hdr;
8375         struct sctp_tmit_chunk *chk;
8376         uint16_t ptype, plen;
8377
8378         /* First find the cookie in the param area */
8379         cookie = NULL;
8380         at = offset + sizeof(struct sctp_init_chunk);
8381
8382         SCTP_TCB_LOCK_ASSERT(stcb);
8383         do {
8384                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8385                 if (phdr == NULL) {
8386                         return (-3);
8387                 }
8388                 ptype = ntohs(phdr->param_type);
8389                 plen = ntohs(phdr->param_length);
8390                 if (ptype == SCTP_STATE_COOKIE) {
8391                         int pad;
8392
8393                         /* found the cookie */
8394                         if ((pad = (plen % 4))) {
8395                                 plen += 4 - pad;
8396                         }
8397                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8398                         if (cookie == NULL) {
8399                                 /* No memory */
8400                                 return (-2);
8401                         }
8402 #ifdef SCTP_MBUF_LOGGING
8403                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8404                                 struct mbuf *mat;
8405
8406                                 mat = cookie;
8407                                 while (mat) {
8408                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8409                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8410                                         }
8411                                         mat = SCTP_BUF_NEXT(mat);
8412                                 }
8413                         }
8414 #endif
8415                         break;
8416                 }
8417                 at += SCTP_SIZE32(plen);
8418         } while (phdr);
8419         if (cookie == NULL) {
8420                 /* Did not find the cookie */
8421                 return (-3);
8422         }
8423         /* ok, we got the cookie lets change it into a cookie echo chunk */
8424
8425         /* first the change from param to cookie */
8426         hdr = mtod(cookie, struct sctp_chunkhdr *);
8427         hdr->chunk_type = SCTP_COOKIE_ECHO;
8428         hdr->chunk_flags = 0;
8429         /* get the chunk stuff now and place it in the FRONT of the queue */
8430         sctp_alloc_a_chunk(stcb, chk);
8431         if (chk == NULL) {
8432                 /* no memory */
8433                 sctp_m_freem(cookie);
8434                 return (-5);
8435         }
8436         chk->copy_by_ref = 0;
8437         chk->send_size = plen;
8438         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8439         chk->rec.chunk_id.can_take_data = 0;
8440         chk->sent = SCTP_DATAGRAM_UNSENT;
8441         chk->snd_count = 0;
8442         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8443         chk->asoc = &stcb->asoc;
8444         chk->data = cookie;
8445         chk->whoTo = chk->asoc->primary_destination;
8446         atomic_add_int(&chk->whoTo->ref_count, 1);
8447         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8448         chk->asoc->ctrl_queue_cnt++;
8449         return (0);
8450 }
8451
8452 void
8453 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8454     struct mbuf *m,
8455     int offset,
8456     int chk_length,
8457     struct sctp_nets *net)
8458 {
8459         /*
8460          * take a HB request and make it into a HB ack and send it.
8461          */
8462         struct mbuf *outchain;
8463         struct sctp_chunkhdr *chdr;
8464         struct sctp_tmit_chunk *chk;
8465
8466
8467         if (net == NULL)
8468                 /* must have a net pointer */
8469                 return;
8470
8471         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8472         if (outchain == NULL) {
8473                 /* gak out of memory */
8474                 return;
8475         }
8476 #ifdef SCTP_MBUF_LOGGING
8477         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8478                 struct mbuf *mat;
8479
8480                 mat = outchain;
8481                 while (mat) {
8482                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8483                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8484                         }
8485                         mat = SCTP_BUF_NEXT(mat);
8486                 }
8487         }
8488 #endif
8489         chdr = mtod(outchain, struct sctp_chunkhdr *);
8490         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8491         chdr->chunk_flags = 0;
8492         if (chk_length % 4) {
8493                 /* need pad */
8494                 uint32_t cpthis = 0;
8495                 int padlen;
8496
8497                 padlen = 4 - (chk_length % 4);
8498                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8499         }
8500         sctp_alloc_a_chunk(stcb, chk);
8501         if (chk == NULL) {
8502                 /* no memory */
8503                 sctp_m_freem(outchain);
8504                 return;
8505         }
8506         chk->copy_by_ref = 0;
8507         chk->send_size = chk_length;
8508         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8509         chk->rec.chunk_id.can_take_data = 1;
8510         chk->sent = SCTP_DATAGRAM_UNSENT;
8511         chk->snd_count = 0;
8512         chk->flags = 0;
8513         chk->asoc = &stcb->asoc;
8514         chk->data = outchain;
8515         chk->whoTo = net;
8516         atomic_add_int(&chk->whoTo->ref_count, 1);
8517         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8518         chk->asoc->ctrl_queue_cnt++;
8519 }
8520
8521 void
8522 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8523 {
8524         /* formulate and queue a cookie-ack back to sender */
8525         struct mbuf *cookie_ack;
8526         struct sctp_chunkhdr *hdr;
8527         struct sctp_tmit_chunk *chk;
8528
8529         cookie_ack = NULL;
8530         SCTP_TCB_LOCK_ASSERT(stcb);
8531
8532         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8533         if (cookie_ack == NULL) {
8534                 /* no mbuf's */
8535                 return;
8536         }
8537         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8538         sctp_alloc_a_chunk(stcb, chk);
8539         if (chk == NULL) {
8540                 /* no memory */
8541                 sctp_m_freem(cookie_ack);
8542                 return;
8543         }
8544         chk->copy_by_ref = 0;
8545         chk->send_size = sizeof(struct sctp_chunkhdr);
8546         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8547         chk->rec.chunk_id.can_take_data = 1;
8548         chk->sent = SCTP_DATAGRAM_UNSENT;
8549         chk->snd_count = 0;
8550         chk->flags = 0;
8551         chk->asoc = &stcb->asoc;
8552         chk->data = cookie_ack;
8553         if (chk->asoc->last_control_chunk_from != NULL) {
8554                 chk->whoTo = chk->asoc->last_control_chunk_from;
8555         } else {
8556                 chk->whoTo = chk->asoc->primary_destination;
8557         }
8558         atomic_add_int(&chk->whoTo->ref_count, 1);
8559         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8560         hdr->chunk_type = SCTP_COOKIE_ACK;
8561         hdr->chunk_flags = 0;
8562         hdr->chunk_length = htons(chk->send_size);
8563         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8564         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8565         chk->asoc->ctrl_queue_cnt++;
8566         return;
8567 }
8568
8569
8570 void
8571 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8572 {
8573         /* formulate and queue a SHUTDOWN-ACK back to the sender */
8574         struct mbuf *m_shutdown_ack;
8575         struct sctp_shutdown_ack_chunk *ack_cp;
8576         struct sctp_tmit_chunk *chk;
8577
8578         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8579         if (m_shutdown_ack == NULL) {
8580                 /* no mbuf's */
8581                 return;
8582         }
8583         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
8584         sctp_alloc_a_chunk(stcb, chk);
8585         if (chk == NULL) {
8586                 /* no memory */
8587                 sctp_m_freem(m_shutdown_ack);
8588                 return;
8589         }
8590         chk->copy_by_ref = 0;
8591         chk->send_size = sizeof(struct sctp_chunkhdr);
8592         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
8593         chk->rec.chunk_id.can_take_data = 1;
8594         chk->sent = SCTP_DATAGRAM_UNSENT;
8595         chk->snd_count = 0;
8596         chk->flags = 0;
8597         chk->asoc = &stcb->asoc;
8598         chk->data = m_shutdown_ack;
8599         chk->whoTo = net;
8600         atomic_add_int(&net->ref_count, 1);
8601
8602         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
8603         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
8604         ack_cp->ch.chunk_flags = 0;
8605         ack_cp->ch.chunk_length = htons(chk->send_size);
8606         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
8607         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8608         chk->asoc->ctrl_queue_cnt++;
8609         return;
8610 }
8611
8612 void
8613 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
8614 {
8615         /* formulate and queue a SHUTDOWN to the sender */
8616         struct mbuf *m_shutdown;
8617         struct sctp_shutdown_chunk *shutdown_cp;
8618         struct sctp_tmit_chunk *chk;
8619
8620         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
8621         if (m_shutdown == NULL) {
8622                 /* no mbuf's */
8623                 return;
8624         }
8625         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
8626         sctp_alloc_a_chunk(stcb, chk);
8627         if (chk == NULL) {
8628                 /* no memory */
8629                 sctp_m_freem(m_shutdown);
8630                 return;
8631         }
8632         chk->copy_by_ref = 0;
8633         chk->send_size = sizeof(struct sctp_shutdown_chunk);
8634         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
8635         chk->rec.chunk_id.can_take_data = 1;
8636         chk->sent = SCTP_DATAGRAM_UNSENT;
8637         chk->snd_count = 0;
8638         chk->flags = 0;
8639         chk->asoc = &stcb->asoc;
8640         chk->data = m_shutdown;
8641         chk->whoTo = net;
8642         atomic_add_int(&net->ref_count, 1);
8643
8644         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
8645         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
8646         shutdown_cp->ch.chunk_flags = 0;
8647         shutdown_cp->ch.chunk_length = htons(chk->send_size);
8648         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
8649         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
8650         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8651         chk->asoc->ctrl_queue_cnt++;
8652         return;
8653 }
8654
8655 void
8656 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
8657 {
8658         /*
8659          * formulate and queue an ASCONF to the peer. ASCONF parameters
8660          * should be queued on the assoc queue.
8661          */
8662         struct sctp_tmit_chunk *chk;
8663         struct mbuf *m_asconf;
8664         int len;
8665
8666         SCTP_TCB_LOCK_ASSERT(stcb);
8667
8668         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
8669             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
8670                 /* can't send a new one if there is one in flight already */
8671                 return;
8672         }
8673         /* compose an ASCONF chunk, maximum length is PMTU */
8674         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
8675         if (m_asconf == NULL) {
8676                 return;
8677         }
8678         sctp_alloc_a_chunk(stcb, chk);
8679         if (chk == NULL) {
8680                 /* no memory */
8681                 sctp_m_freem(m_asconf);
8682                 return;
8683         }
8684         chk->copy_by_ref = 0;
8685         chk->data = m_asconf;
8686         chk->send_size = len;
8687         chk->rec.chunk_id.id = SCTP_ASCONF;
8688         chk->rec.chunk_id.can_take_data = 0;
8689         chk->sent = SCTP_DATAGRAM_UNSENT;
8690         chk->snd_count = 0;
8691         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8692         chk->asoc = &stcb->asoc;
8693         chk->whoTo = net;
8694         atomic_add_int(&chk->whoTo->ref_count, 1);
8695         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
8696         chk->asoc->ctrl_queue_cnt++;
8697         return;
8698 }
8699
8700 void
8701 sctp_send_asconf_ack(struct sctp_tcb *stcb)
8702 {
8703         /*
8704          * formulate and queue a asconf-ack back to sender. the asconf-ack
8705          * must be stored in the tcb.
8706          */
8707         struct sctp_tmit_chunk *chk;
8708         struct sctp_asconf_ack *ack, *latest_ack;
8709         struct mbuf *m_ack, *m;
8710         struct sctp_nets *net = NULL;
8711
8712         SCTP_TCB_LOCK_ASSERT(stcb);
8713         /* Get the latest ASCONF-ACK */
8714         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
8715         if (latest_ack == NULL) {
8716                 return;
8717         }
8718         if (latest_ack->last_sent_to != NULL &&
8719             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
8720                 /* we're doing a retransmission */
8721                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
8722                 if (net == NULL) {
8723                         /* no alternate */
8724                         if (stcb->asoc.last_control_chunk_from == NULL)
8725                                 net = stcb->asoc.primary_destination;
8726                         else
8727                                 net = stcb->asoc.last_control_chunk_from;
8728                 }
8729         } else {
8730                 /* normal case */
8731                 if (stcb->asoc.last_control_chunk_from == NULL)
8732                         net = stcb->asoc.primary_destination;
8733                 else
8734                         net = stcb->asoc.last_control_chunk_from;
8735         }
8736         latest_ack->last_sent_to = net;
8737
8738         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
8739                 if (ack->data == NULL) {
8740                         continue;
8741                 }
8742                 /* copy the asconf_ack */
8743                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
8744                 if (m_ack == NULL) {
8745                         /* couldn't copy it */
8746                         return;
8747                 }
8748 #ifdef SCTP_MBUF_LOGGING
8749                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8750                         struct mbuf *mat;
8751
8752                         mat = m_ack;
8753                         while (mat) {
8754                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
8755                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8756                                 }
8757                                 mat = SCTP_BUF_NEXT(mat);
8758                         }
8759                 }
8760 #endif
8761
8762                 sctp_alloc_a_chunk(stcb, chk);
8763                 if (chk == NULL) {
8764                         /* no memory */
8765                         if (m_ack)
8766                                 sctp_m_freem(m_ack);
8767                         return;
8768                 }
8769                 chk->copy_by_ref = 0;
8770
8771                 chk->whoTo = net;
8772                 chk->data = m_ack;
8773                 chk->send_size = 0;
8774                 /* Get size */
8775                 m = m_ack;
8776                 chk->send_size = ack->len;
8777                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
8778                 chk->rec.chunk_id.can_take_data = 1;
8779                 chk->sent = SCTP_DATAGRAM_UNSENT;
8780                 chk->snd_count = 0;
8781                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
8782                 chk->asoc = &stcb->asoc;
8783                 atomic_add_int(&chk->whoTo->ref_count, 1);
8784
8785                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8786                 chk->asoc->ctrl_queue_cnt++;
8787         }
8788         return;
8789 }
8790
8791
8792 static int
8793 sctp_chunk_retransmission(struct sctp_inpcb *inp,
8794     struct sctp_tcb *stcb,
8795     struct sctp_association *asoc,
8796     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
8797 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
8798     SCTP_UNUSED
8799 #endif
8800 )
8801 {
8802         /*-
8803          * send out one MTU of retransmission. If fast_retransmit is
8804          * happening we ignore the cwnd. Otherwise we obey the cwnd and
8805          * rwnd. For a Cookie or Asconf in the control chunk queue we
8806          * retransmit them by themselves.
8807          *
8808          * For data chunks we will pick out the lowest TSN's in the sent_queue
8809          * marked for resend and bundle them all together (up to a MTU of
8810          * destination). The address to send to should have been
8811          * selected/changed where the retransmission was marked (i.e. in FR
8812          * or t3-timeout routines).
8813          */
8814         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
8815         struct sctp_tmit_chunk *chk, *fwd;
8816         struct mbuf *m, *endofchain;
8817         struct sctp_nets *net = NULL;
8818         uint32_t tsns_sent = 0;
8819         int no_fragmentflg, bundle_at, cnt_thru;
8820         unsigned int mtu;
8821         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
8822         struct sctp_auth_chunk *auth = NULL;
8823         uint32_t auth_offset = 0;
8824         uint16_t auth_keyid;
8825         int override_ok = 1;
8826         int data_auth_reqd = 0;
8827         uint32_t dmtu = 0;
8828
8829         SCTP_TCB_LOCK_ASSERT(stcb);
8830         tmr_started = ctl_cnt = bundle_at = error = 0;
8831         no_fragmentflg = 1;
8832         fwd_tsn = 0;
8833         *cnt_out = 0;
8834         fwd = NULL;
8835         endofchain = m = NULL;
8836         auth_keyid = stcb->asoc.authinfo.active_keyid;
8837 #ifdef SCTP_AUDITING_ENABLED
8838         sctp_audit_log(0xC3, 1);
8839 #endif
8840         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
8841             (TAILQ_EMPTY(&asoc->control_send_queue))) {
8842                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
8843                     asoc->sent_queue_retran_cnt);
8844                 asoc->sent_queue_cnt = 0;
8845                 asoc->sent_queue_cnt_removeable = 0;
8846                 /* send back 0/0 so we enter normal transmission */
8847                 *cnt_out = 0;
8848                 return (0);
8849         }
8850         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8851                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
8852                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
8853                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
8854                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
8855                                 continue;
8856                         }
8857                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
8858                                 if (chk != asoc->str_reset) {
8859                                         /*
8860                                          * not eligible for retran if its
8861                                          * not ours
8862                                          */
8863                                         continue;
8864                                 }
8865                         }
8866                         ctl_cnt++;
8867                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
8868                                 fwd_tsn = 1;
8869                                 fwd = chk;
8870                         }
8871                         /*
8872                          * Add an AUTH chunk, if chunk requires it save the
8873                          * offset into the chain for AUTH
8874                          */
8875                         if ((auth == NULL) &&
8876                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8877                             stcb->asoc.peer_auth_chunks))) {
8878                                 m = sctp_add_auth_chunk(m, &endofchain,
8879                                     &auth, &auth_offset,
8880                                     stcb,
8881                                     chk->rec.chunk_id.id);
8882                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8883                         }
8884                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
8885                         break;
8886                 }
8887         }
8888         one_chunk = 0;
8889         cnt_thru = 0;
8890         /* do we have control chunks to retransmit? */
8891         if (m != NULL) {
8892                 /* Start a timer no matter if we suceed or fail */
8893                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8894                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
8895                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
8896                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
8897                 chk->snd_count++;       /* update our count */
8898                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
8899                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
8900                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
8901                     no_fragmentflg, 0, NULL, 0,
8902                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
8903                     chk->whoTo->port, so_locked, NULL, NULL))) {
8904                         SCTP_STAT_INCR(sctps_lowlevelerr);
8905                         return (error);
8906                 }
8907                 m = endofchain = NULL;
8908                 auth = NULL;
8909                 auth_offset = 0;
8910                 /*
8911                  * We don't want to mark the net->sent time here since this
8912                  * we use this for HB and retrans cannot measure RTT
8913                  */
8914                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
8915                 *cnt_out += 1;
8916                 chk->sent = SCTP_DATAGRAM_SENT;
8917                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
8918                 if (fwd_tsn == 0) {
8919                         return (0);
8920                 } else {
8921                         /* Clean up the fwd-tsn list */
8922                         sctp_clean_up_ctl(stcb, asoc);
8923                         return (0);
8924                 }
8925         }
8926         /*
8927          * Ok, it is just data retransmission we need to do or that and a
8928          * fwd-tsn with it all.
8929          */
8930         if (TAILQ_EMPTY(&asoc->sent_queue)) {
8931                 return (SCTP_RETRAN_DONE);
8932         }
8933         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
8934             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
8935                 /* not yet open, resend the cookie and that is it */
8936                 return (1);
8937         }
8938 #ifdef SCTP_AUDITING_ENABLED
8939         sctp_auditing(20, inp, stcb, NULL);
8940 #endif
8941         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
8942         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
8943                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
8944                         /* No, not sent to this net or not ready for rtx */
8945                         continue;
8946                 }
8947                 if (chk->data == NULL) {
8948                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
8949                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
8950                         continue;
8951                 }
8952                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
8953                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
8954                         /* Gak, we have exceeded max unlucky retran, abort! */
8955                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
8956                             chk->snd_count,
8957                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
8958                         atomic_add_int(&stcb->asoc.refcnt, 1);
8959                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
8960                         SCTP_TCB_LOCK(stcb);
8961                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
8962                         return (SCTP_RETRAN_EXIT);
8963                 }
8964                 /* pick up the net */
8965                 net = chk->whoTo;
8966                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8967                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8968                 } else {
8969                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8970                 }
8971
8972                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
8973                         /* No room in peers rwnd */
8974                         uint32_t tsn;
8975
8976                         tsn = asoc->last_acked_seq + 1;
8977                         if (tsn == chk->rec.data.TSN_seq) {
8978                                 /*
8979                                  * we make a special exception for this
8980                                  * case. The peer has no rwnd but is missing
8981                                  * the lowest chunk.. which is probably what
8982                                  * is holding up the rwnd.
8983                                  */
8984                                 goto one_chunk_around;
8985                         }
8986                         return (1);
8987                 }
8988 one_chunk_around:
8989                 if (asoc->peers_rwnd < mtu) {
8990                         one_chunk = 1;
8991                         if ((asoc->peers_rwnd == 0) &&
8992                             (asoc->total_flight == 0)) {
8993                                 chk->window_probe = 1;
8994                                 chk->whoTo->window_probe = 1;
8995                         }
8996                 }
8997 #ifdef SCTP_AUDITING_ENABLED
8998                 sctp_audit_log(0xC3, 2);
8999 #endif
9000                 bundle_at = 0;
9001                 m = NULL;
9002                 net->fast_retran_ip = 0;
9003                 if (chk->rec.data.doing_fast_retransmit == 0) {
9004                         /*
9005                          * if no FR in progress skip destination that have
9006                          * flight_size > cwnd.
9007                          */
9008                         if (net->flight_size >= net->cwnd) {
9009                                 continue;
9010                         }
9011                 } else {
9012                         /*
9013                          * Mark the destination net to have FR recovery
9014                          * limits put on it.
9015                          */
9016                         *fr_done = 1;
9017                         net->fast_retran_ip = 1;
9018                 }
9019
9020                 /*
9021                  * if no AUTH is yet included and this chunk requires it,
9022                  * make sure to account for it.  We don't apply the size
9023                  * until the AUTH chunk is actually added below in case
9024                  * there is no room for this chunk.
9025                  */
9026                 if (data_auth_reqd && (auth == NULL)) {
9027                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9028                 } else
9029                         dmtu = 0;
9030
9031                 if ((chk->send_size <= (mtu - dmtu)) ||
9032                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9033                         /* ok we will add this one */
9034                         if (data_auth_reqd) {
9035                                 if (auth == NULL) {
9036                                         m = sctp_add_auth_chunk(m,
9037                                             &endofchain,
9038                                             &auth,
9039                                             &auth_offset,
9040                                             stcb,
9041                                             SCTP_DATA);
9042                                         auth_keyid = chk->auth_keyid;
9043                                         override_ok = 0;
9044                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9045                                 } else if (override_ok) {
9046                                         auth_keyid = chk->auth_keyid;
9047                                         override_ok = 0;
9048                                 } else if (chk->auth_keyid != auth_keyid) {
9049                                         /* different keyid, so done bundling */
9050                                         break;
9051                                 }
9052                         }
9053                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9054                         if (m == NULL) {
9055                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9056                                 return (ENOMEM);
9057                         }
9058                         /* Do clear IP_DF ? */
9059                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9060                                 no_fragmentflg = 0;
9061                         }
9062                         /* upate our MTU size */
9063                         if (mtu > (chk->send_size + dmtu))
9064                                 mtu -= (chk->send_size + dmtu);
9065                         else
9066                                 mtu = 0;
9067                         data_list[bundle_at++] = chk;
9068                         if (one_chunk && (asoc->total_flight <= 0)) {
9069                                 SCTP_STAT_INCR(sctps_windowprobed);
9070                         }
9071                 }
9072                 if (one_chunk == 0) {
9073                         /*
9074                          * now are there anymore forward from chk to pick
9075                          * up?
9076                          */
9077                         fwd = TAILQ_NEXT(chk, sctp_next);
9078                         while (fwd) {
9079                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9080                                         /* Nope, not for retran */
9081                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9082                                         continue;
9083                                 }
9084                                 if (fwd->whoTo != net) {
9085                                         /* Nope, not the net in question */
9086                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9087                                         continue;
9088                                 }
9089                                 if (data_auth_reqd && (auth == NULL)) {
9090                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9091                                 } else
9092                                         dmtu = 0;
9093                                 if (fwd->send_size <= (mtu - dmtu)) {
9094                                         if (data_auth_reqd) {
9095                                                 if (auth == NULL) {
9096                                                         m = sctp_add_auth_chunk(m,
9097                                                             &endofchain,
9098                                                             &auth,
9099                                                             &auth_offset,
9100                                                             stcb,
9101                                                             SCTP_DATA);
9102                                                         auth_keyid = fwd->auth_keyid;
9103                                                         override_ok = 0;
9104                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9105                                                 } else if (override_ok) {
9106                                                         auth_keyid = fwd->auth_keyid;
9107                                                         override_ok = 0;
9108                                                 } else if (fwd->auth_keyid != auth_keyid) {
9109                                                         /*
9110                                                          * different keyid,
9111                                                          * so done bundling
9112                                                          */
9113                                                         break;
9114                                                 }
9115                                         }
9116                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9117                                         if (m == NULL) {
9118                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9119                                                 return (ENOMEM);
9120                                         }
9121                                         /* Do clear IP_DF ? */
9122                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9123                                                 no_fragmentflg = 0;
9124                                         }
9125                                         /* upate our MTU size */
9126                                         if (mtu > (fwd->send_size + dmtu))
9127                                                 mtu -= (fwd->send_size + dmtu);
9128                                         else
9129                                                 mtu = 0;
9130                                         data_list[bundle_at++] = fwd;
9131                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9132                                                 break;
9133                                         }
9134                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9135                                 } else {
9136                                         /* can't fit so we are done */
9137                                         break;
9138                                 }
9139                         }
9140                 }
9141                 /* Is there something to send for this destination? */
9142                 if (m) {
9143                         /*
9144                          * No matter if we fail/or suceed we should start a
9145                          * timer. A failure is like a lost IP packet :-)
9146                          */
9147                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9148                                 /*
9149                                  * no timer running on this destination
9150                                  * restart it.
9151                                  */
9152                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9153                                 tmr_started = 1;
9154                         }
9155                         /* Now lets send it, if there is anything to send :> */
9156                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9157                             (struct sockaddr *)&net->ro._l_addr, m,
9158                             auth_offset, auth, auth_keyid,
9159                             no_fragmentflg, 0, NULL, 0,
9160                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9161                             net->port, so_locked, NULL, NULL))) {
9162                                 /* error, we could not output */
9163                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9164                                 return (error);
9165                         }
9166                         m = endofchain = NULL;
9167                         auth = NULL;
9168                         auth_offset = 0;
9169                         /* For HB's */
9170                         /*
9171                          * We don't want to mark the net->sent time here
9172                          * since this we use this for HB and retrans cannot
9173                          * measure RTT
9174                          */
9175                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9176
9177                         /* For auto-close */
9178                         cnt_thru++;
9179                         if (*now_filled == 0) {
9180                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9181                                 *now = asoc->time_last_sent;
9182                                 *now_filled = 1;
9183                         } else {
9184                                 asoc->time_last_sent = *now;
9185                         }
9186                         *cnt_out += bundle_at;
9187 #ifdef SCTP_AUDITING_ENABLED
9188                         sctp_audit_log(0xC4, bundle_at);
9189 #endif
9190                         if (bundle_at) {
9191                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9192                         }
9193                         for (i = 0; i < bundle_at; i++) {
9194                                 SCTP_STAT_INCR(sctps_sendretransdata);
9195                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9196                                 /*
9197                                  * When we have a revoked data, and we
9198                                  * retransmit it, then we clear the revoked
9199                                  * flag since this flag dictates if we
9200                                  * subtracted from the fs
9201                                  */
9202                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9203                                         /* Deflate the cwnd */
9204                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9205                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9206                                 }
9207                                 data_list[i]->snd_count++;
9208                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9209                                 /* record the time */
9210                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9211                                 if (data_list[i]->book_size_scale) {
9212                                         /*
9213                                          * need to double the book size on
9214                                          * this one
9215                                          */
9216                                         data_list[i]->book_size_scale = 0;
9217                                         /*
9218                                          * Since we double the booksize, we
9219                                          * must also double the output queue
9220                                          * size, since this get shrunk when
9221                                          * we free by this amount.
9222                                          */
9223                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9224                                         data_list[i]->book_size *= 2;
9225
9226
9227                                 } else {
9228                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9229                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9230                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9231                                         }
9232                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9233                                             (uint32_t) (data_list[i]->send_size +
9234                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9235                                 }
9236                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9237                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9238                                             data_list[i]->whoTo->flight_size,
9239                                             data_list[i]->book_size,
9240                                             (uintptr_t) data_list[i]->whoTo,
9241                                             data_list[i]->rec.data.TSN_seq);
9242                                 }
9243                                 sctp_flight_size_increase(data_list[i]);
9244                                 sctp_total_flight_increase(stcb, data_list[i]);
9245                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9246                                         /* SWS sender side engages */
9247                                         asoc->peers_rwnd = 0;
9248                                 }
9249                                 if ((i == 0) &&
9250                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9251                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9252                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9253                                             (tmr_started == 0)) {
9254                                                 /*-
9255                                                  * ok we just fast-retrans'd
9256                                                  * the lowest TSN, i.e the
9257                                                  * first on the list. In
9258                                                  * this case we want to give
9259                                                  * some more time to get a
9260                                                  * SACK back without a
9261                                                  * t3-expiring.
9262                                                  */
9263                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9264                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9265                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9266                                         }
9267                                 }
9268                         }
9269                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9270                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9271                         }
9272 #ifdef SCTP_AUDITING_ENABLED
9273                         sctp_auditing(21, inp, stcb, NULL);
9274 #endif
9275                 } else {
9276                         /* None will fit */
9277                         return (1);
9278                 }
9279                 if (asoc->sent_queue_retran_cnt <= 0) {
9280                         /* all done we have no more to retran */
9281                         asoc->sent_queue_retran_cnt = 0;
9282                         break;
9283                 }
9284                 if (one_chunk) {
9285                         /* No more room in rwnd */
9286                         return (1);
9287                 }
9288                 /* stop the for loop here. we sent out a packet */
9289                 break;
9290         }
9291         return (0);
9292 }
9293
9294
9295 static int
9296 sctp_timer_validation(struct sctp_inpcb *inp,
9297     struct sctp_tcb *stcb,
9298     struct sctp_association *asoc,
9299     int ret)
9300 {
9301         struct sctp_nets *net;
9302
9303         /* Validate that a timer is running somewhere */
9304         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9305                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9306                         /* Here is a timer */
9307                         return (ret);
9308                 }
9309         }
9310         SCTP_TCB_LOCK_ASSERT(stcb);
9311         /* Gak, we did not have a timer somewhere */
9312         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9313         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9314         return (ret);
9315 }
9316
9317 void
9318 sctp_chunk_output(struct sctp_inpcb *inp,
9319     struct sctp_tcb *stcb,
9320     int from_where,
9321     int so_locked
9322 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9323     SCTP_UNUSED
9324 #endif
9325 )
9326 {
9327         /*-
9328          * Ok this is the generic chunk service queue. we must do the
9329          * following:
9330          * - See if there are retransmits pending, if so we must
9331          *   do these first.
9332          * - Service the stream queue that is next, moving any
9333          *   message (note I must get a complete message i.e.
9334          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9335          *   TSN's
9336          * - Check to see if the cwnd/rwnd allows any output, if so we
9337          *   go ahead and fomulate and send the low level chunks. Making sure
9338          *   to combine any control in the control chunk queue also.
9339          */
9340         struct sctp_association *asoc;
9341         struct sctp_nets *net;
9342         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9343         unsigned int burst_cnt = 0;
9344         struct timeval now;
9345         int now_filled = 0;
9346         int nagle_on = 0;
9347         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9348         int un_sent = 0;
9349         int fr_done;
9350         unsigned int tot_frs = 0;
9351
9352         asoc = &stcb->asoc;
9353         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9354                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9355                         nagle_on = 0;
9356                 } else {
9357                         nagle_on = 1;
9358                 }
9359         }
9360         SCTP_TCB_LOCK_ASSERT(stcb);
9361
9362         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9363
9364         if ((un_sent <= 0) &&
9365             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9366             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9367             (asoc->sent_queue_retran_cnt == 0)) {
9368                 /* Nothing to do unless there is something to be sent left */
9369                 return;
9370         }
9371         /*
9372          * Do we have something to send, data or control AND a sack timer
9373          * running, if so piggy-back the sack.
9374          */
9375         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9376                 sctp_send_sack(stcb);
9377                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9378         }
9379         while (asoc->sent_queue_retran_cnt) {
9380                 /*-
9381                  * Ok, it is retransmission time only, we send out only ONE
9382                  * packet with a single call off to the retran code.
9383                  */
9384                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9385                         /*-
9386                          * Special hook for handling cookiess discarded
9387                          * by peer that carried data. Send cookie-ack only
9388                          * and then the next call with get the retran's.
9389                          */
9390                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9391                             from_where,
9392                             &now, &now_filled, frag_point, so_locked);
9393                         return;
9394                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9395                         /* if its not from a HB then do it */
9396                         fr_done = 0;
9397                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9398                         if (fr_done) {
9399                                 tot_frs++;
9400                         }
9401                 } else {
9402                         /*
9403                          * its from any other place, we don't allow retran
9404                          * output (only control)
9405                          */
9406                         ret = 1;
9407                 }
9408                 if (ret > 0) {
9409                         /* Can't send anymore */
9410                         /*-
9411                          * now lets push out control by calling med-level
9412                          * output once. this assures that we WILL send HB's
9413                          * if queued too.
9414                          */
9415                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9416                             from_where,
9417                             &now, &now_filled, frag_point, so_locked);
9418 #ifdef SCTP_AUDITING_ENABLED
9419                         sctp_auditing(8, inp, stcb, NULL);
9420 #endif
9421                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9422                         return;
9423                 }
9424                 if (ret < 0) {
9425                         /*-
9426                          * The count was off.. retran is not happening so do
9427                          * the normal retransmission.
9428                          */
9429 #ifdef SCTP_AUDITING_ENABLED
9430                         sctp_auditing(9, inp, stcb, NULL);
9431 #endif
9432                         if (ret == SCTP_RETRAN_EXIT) {
9433                                 return;
9434                         }
9435                         break;
9436                 }
9437                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9438                         /* Only one transmission allowed out of a timeout */
9439 #ifdef SCTP_AUDITING_ENABLED
9440                         sctp_auditing(10, inp, stcb, NULL);
9441 #endif
9442                         /* Push out any control */
9443                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9444                             &now, &now_filled, frag_point, so_locked);
9445                         return;
9446                 }
9447                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9448                         /* Hit FR burst limit */
9449                         return;
9450                 }
9451                 if ((num_out == 0) && (ret == 0)) {
9452                         /* No more retrans to send */
9453                         break;
9454                 }
9455         }
9456 #ifdef SCTP_AUDITING_ENABLED
9457         sctp_auditing(12, inp, stcb, NULL);
9458 #endif
9459         /* Check for bad destinations, if they exist move chunks around. */
9460         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9461                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
9462                     SCTP_ADDR_NOT_REACHABLE) {
9463                         /*-
9464                          * if possible move things off of this address we
9465                          * still may send below due to the dormant state but
9466                          * we try to find an alternate address to send to
9467                          * and if we have one we move all queued data on the
9468                          * out wheel to this alternate address.
9469                          */
9470                         if (net->ref_count > 1)
9471                                 sctp_move_chunks_from_net(stcb, net);
9472                 } else if ((asoc->sctp_cmt_on_off > 0) &&
9473                             (asoc->sctp_cmt_pf > 0) &&
9474                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
9475                         /*
9476                          * JRS 5/14/07 - If CMT PF is on and the current
9477                          * destination is in PF state, move all queued data
9478                          * to an alternate desination.
9479                          */
9480                         if (net->ref_count > 1)
9481                                 sctp_move_chunks_from_net(stcb, net);
9482                 } else {
9483                         /*-
9484                          * if ((asoc->sat_network) || (net->addr_is_local))
9485                          * { burst_limit = asoc->max_burst *
9486                          * SCTP_SAT_NETWORK_BURST_INCR; }
9487                          */
9488                         if (asoc->max_burst > 0) {
9489                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9490                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9491                                                 /*
9492                                                  * JRS - Use the congestion
9493                                                  * control given in the
9494                                                  * congestion control module
9495                                                  */
9496                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9497                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9498                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9499                                                 }
9500                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9501                                         }
9502                                         net->fast_retran_ip = 0;
9503                                 } else {
9504                                         if (net->flight_size == 0) {
9505                                                 /*
9506                                                  * Should be decaying the
9507                                                  * cwnd here
9508                                                  */
9509                                                 ;
9510                                         }
9511                                 }
9512                         }
9513                 }
9514
9515         }
9516         burst_cnt = 0;
9517         do {
9518                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9519                     &reason_code, 0, from_where,
9520                     &now, &now_filled, frag_point, so_locked);
9521                 if (error) {
9522                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9523                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9524                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9525                         }
9526                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9527                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9528                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9529                         }
9530                         break;
9531                 }
9532                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9533
9534                 tot_out += num_out;
9535                 burst_cnt++;
9536                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9537                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9538                         if (num_out == 0) {
9539                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9540                         }
9541                 }
9542                 if (nagle_on) {
9543                         /*-
9544                          * When nagle is on, we look at how much is un_sent, then
9545                          * if its smaller than an MTU and we have data in
9546                          * flight we stop.
9547                          */
9548                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9549                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9550                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9551                             (stcb->asoc.total_flight > 0)) {
9552                                 break;
9553                         }
9554                 }
9555                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
9556                     TAILQ_EMPTY(&asoc->send_queue) &&
9557                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
9558                         /* Nothing left to send */
9559                         break;
9560                 }
9561                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
9562                         /* Nothing left to send */
9563                         break;
9564                 }
9565         } while (num_out &&
9566             ((asoc->max_burst == 0) ||
9567             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
9568             (burst_cnt < asoc->max_burst)));
9569
9570         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
9571                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
9572                         SCTP_STAT_INCR(sctps_maxburstqueued);
9573                         asoc->burst_limit_applied = 1;
9574                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9575                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
9576                         }
9577                 } else {
9578                         asoc->burst_limit_applied = 0;
9579                 }
9580         }
9581         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9582                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
9583         }
9584         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
9585             tot_out);
9586
9587         /*-
9588          * Now we need to clean up the control chunk chain if a ECNE is on
9589          * it. It must be marked as UNSENT again so next call will continue
9590          * to send it until such time that we get a CWR, to remove it.
9591          */
9592         if (stcb->asoc.ecn_echo_cnt_onq)
9593                 sctp_fix_ecn_echo(asoc);
9594         return;
9595 }
9596
9597
9598 int
9599 sctp_output(inp, m, addr, control, p, flags)
9600         struct sctp_inpcb *inp;
9601         struct mbuf *m;
9602         struct sockaddr *addr;
9603         struct mbuf *control;
9604         struct thread *p;
9605         int flags;
9606 {
9607         if (inp == NULL) {
9608                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9609                 return (EINVAL);
9610         }
9611         if (inp->sctp_socket == NULL) {
9612                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
9613                 return (EINVAL);
9614         }
9615         return (sctp_sosend(inp->sctp_socket,
9616             addr,
9617             (struct uio *)NULL,
9618             m,
9619             control,
9620             flags, p
9621             ));
9622 }
9623
9624 void
9625 send_forward_tsn(struct sctp_tcb *stcb,
9626     struct sctp_association *asoc)
9627 {
9628         struct sctp_tmit_chunk *chk;
9629         struct sctp_forward_tsn_chunk *fwdtsn;
9630         uint32_t advance_peer_ack_point;
9631
9632         SCTP_TCB_LOCK_ASSERT(stcb);
9633         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9634                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9635                         /* mark it to unsent */
9636                         chk->sent = SCTP_DATAGRAM_UNSENT;
9637                         chk->snd_count = 0;
9638                         /* Do we correct its output location? */
9639                         if (chk->whoTo != asoc->primary_destination) {
9640                                 sctp_free_remote_addr(chk->whoTo);
9641                                 chk->whoTo = asoc->primary_destination;
9642                                 atomic_add_int(&chk->whoTo->ref_count, 1);
9643                         }
9644                         goto sctp_fill_in_rest;
9645                 }
9646         }
9647         /* Ok if we reach here we must build one */
9648         sctp_alloc_a_chunk(stcb, chk);
9649         if (chk == NULL) {
9650                 return;
9651         }
9652         asoc->fwd_tsn_cnt++;
9653         chk->copy_by_ref = 0;
9654         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
9655         chk->rec.chunk_id.can_take_data = 0;
9656         chk->asoc = asoc;
9657         chk->whoTo = NULL;
9658         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
9659         if (chk->data == NULL) {
9660                 sctp_free_a_chunk(stcb, chk);
9661                 return;
9662         }
9663         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
9664         chk->sent = SCTP_DATAGRAM_UNSENT;
9665         chk->snd_count = 0;
9666         chk->whoTo = asoc->primary_destination;
9667         atomic_add_int(&chk->whoTo->ref_count, 1);
9668         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
9669         asoc->ctrl_queue_cnt++;
9670 sctp_fill_in_rest:
9671         /*-
9672          * Here we go through and fill out the part that deals with
9673          * stream/seq of the ones we skip.
9674          */
9675         SCTP_BUF_LEN(chk->data) = 0;
9676         {
9677                 struct sctp_tmit_chunk *at, *tp1, *last;
9678                 struct sctp_strseq *strseq;
9679                 unsigned int cnt_of_space, i, ovh;
9680                 unsigned int space_needed;
9681                 unsigned int cnt_of_skipped = 0;
9682
9683                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
9684                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
9685                                 /* no more to look at */
9686                                 break;
9687                         }
9688                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9689                                 /* We don't report these */
9690                                 continue;
9691                         }
9692                         cnt_of_skipped++;
9693                 }
9694                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
9695                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
9696
9697                 cnt_of_space = M_TRAILINGSPACE(chk->data);
9698
9699                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9700                         ovh = SCTP_MIN_OVERHEAD;
9701                 } else {
9702                         ovh = SCTP_MIN_V4_OVERHEAD;
9703                 }
9704                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
9705                         /* trim to a mtu size */
9706                         cnt_of_space = asoc->smallest_mtu - ovh;
9707                 }
9708                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9709                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9710                             0xff, 0, cnt_of_skipped,
9711                             asoc->advanced_peer_ack_point);
9712
9713                 }
9714                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
9715                 if (cnt_of_space < space_needed) {
9716                         /*-
9717                          * ok we must trim down the chunk by lowering the
9718                          * advance peer ack point.
9719                          */
9720                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9721                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9722                                     0xff, 0xff, cnt_of_space,
9723                                     space_needed);
9724                         }
9725                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
9726                         cnt_of_skipped /= sizeof(struct sctp_strseq);
9727                         /*-
9728                          * Go through and find the TSN that will be the one
9729                          * we report.
9730                          */
9731                         at = TAILQ_FIRST(&asoc->sent_queue);
9732                         for (i = 0; i < cnt_of_skipped; i++) {
9733                                 tp1 = TAILQ_NEXT(at, sctp_next);
9734                                 if (tp1 == NULL) {
9735                                         break;
9736                                 }
9737                                 at = tp1;
9738                         }
9739                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
9740                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
9741                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
9742                                     asoc->advanced_peer_ack_point);
9743                         }
9744                         last = at;
9745                         /*-
9746                          * last now points to last one I can report, update
9747                          * peer ack point
9748                          */
9749                         if (last)
9750                                 advance_peer_ack_point = last->rec.data.TSN_seq;
9751                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
9752                             cnt_of_skipped * sizeof(struct sctp_strseq);
9753                 }
9754                 chk->send_size = space_needed;
9755                 /* Setup the chunk */
9756                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
9757                 fwdtsn->ch.chunk_length = htons(chk->send_size);
9758                 fwdtsn->ch.chunk_flags = 0;
9759                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
9760                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
9761                 SCTP_BUF_LEN(chk->data) = chk->send_size;
9762                 fwdtsn++;
9763                 /*-
9764                  * Move pointer to after the fwdtsn and transfer to the
9765                  * strseq pointer.
9766                  */
9767                 strseq = (struct sctp_strseq *)fwdtsn;
9768                 /*-
9769                  * Now populate the strseq list. This is done blindly
9770                  * without pulling out duplicate stream info. This is
9771                  * inefficent but won't harm the process since the peer will
9772                  * look at these in sequence and will thus release anything.
9773                  * It could mean we exceed the PMTU and chop off some that
9774                  * we could have included.. but this is unlikely (aka 1432/4
9775                  * would mean 300+ stream seq's would have to be reported in
9776                  * one FWD-TSN. With a bit of work we can later FIX this to
9777                  * optimize and pull out duplcates.. but it does add more
9778                  * overhead. So for now... not!
9779                  */
9780                 at = TAILQ_FIRST(&asoc->sent_queue);
9781                 for (i = 0; i < cnt_of_skipped; i++) {
9782                         tp1 = TAILQ_NEXT(at, sctp_next);
9783                         if (tp1 == NULL)
9784                                 break;
9785                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
9786                                 /* We don't report these */
9787                                 i--;
9788                                 at = tp1;
9789                                 continue;
9790                         }
9791                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
9792                                 at->rec.data.fwd_tsn_cnt = 0;
9793                         }
9794                         strseq->stream = ntohs(at->rec.data.stream_number);
9795                         strseq->sequence = ntohs(at->rec.data.stream_seq);
9796                         strseq++;
9797                         at = tp1;
9798                 }
9799         }
9800         return;
9801
9802 }
9803
9804 void
9805 sctp_send_sack(struct sctp_tcb *stcb)
9806 {
9807         /*-
9808          * Queue up a SACK or NR-SACK in the control queue.
9809          * We must first check to see if a SACK or NR-SACK is
9810          * somehow on the control queue.
9811          * If so, we will take and and remove the old one.
9812          */
9813         struct sctp_association *asoc;
9814         struct sctp_tmit_chunk *chk, *a_chk;
9815         struct sctp_sack_chunk *sack;
9816         struct sctp_nr_sack_chunk *nr_sack;
9817         struct sctp_gap_ack_block *gap_descriptor;
9818         struct sack_track *selector;
9819         int mergeable = 0;
9820         int offset;
9821         caddr_t limit;
9822         uint32_t *dup;
9823         int limit_reached = 0;
9824         unsigned int i, siz, j;
9825         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
9826         int num_dups = 0;
9827         int space_req;
9828         uint32_t highest_tsn;
9829         uint8_t flags;
9830         uint8_t type;
9831         uint8_t tsn_map;
9832
9833         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
9834             (stcb->asoc.peer_supports_nr_sack == 1)) {
9835                 type = SCTP_NR_SELECTIVE_ACK;
9836         } else {
9837                 type = SCTP_SELECTIVE_ACK;
9838         }
9839         a_chk = NULL;
9840         asoc = &stcb->asoc;
9841         SCTP_TCB_LOCK_ASSERT(stcb);
9842         if (asoc->last_data_chunk_from == NULL) {
9843                 /* Hmm we never received anything */
9844                 return;
9845         }
9846         sctp_slide_mapping_arrays(stcb);
9847         sctp_set_rwnd(stcb, asoc);
9848         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9849                 if (chk->rec.chunk_id.id == type) {
9850                         /* Hmm, found a sack already on queue, remove it */
9851                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
9852                         asoc->ctrl_queue_cnt--;
9853                         a_chk = chk;
9854                         if (a_chk->data) {
9855                                 sctp_m_freem(a_chk->data);
9856                                 a_chk->data = NULL;
9857                         }
9858                         sctp_free_remote_addr(a_chk->whoTo);
9859                         a_chk->whoTo = NULL;
9860                         break;
9861                 }
9862         }
9863         if (a_chk == NULL) {
9864                 sctp_alloc_a_chunk(stcb, a_chk);
9865                 if (a_chk == NULL) {
9866                         /* No memory so we drop the idea, and set a timer */
9867                         if (stcb->asoc.delayed_ack) {
9868                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9869                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
9870                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9871                                     stcb->sctp_ep, stcb, NULL);
9872                         } else {
9873                                 stcb->asoc.send_sack = 1;
9874                         }
9875                         return;
9876                 }
9877                 a_chk->copy_by_ref = 0;
9878                 a_chk->rec.chunk_id.id = type;
9879                 a_chk->rec.chunk_id.can_take_data = 1;
9880         }
9881         /* Clear our pkt counts */
9882         asoc->data_pkts_seen = 0;
9883
9884         a_chk->asoc = asoc;
9885         a_chk->snd_count = 0;
9886         a_chk->send_size = 0;   /* fill in later */
9887         a_chk->sent = SCTP_DATAGRAM_UNSENT;
9888         a_chk->whoTo = NULL;
9889
9890         if ((asoc->numduptsns) ||
9891             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) {
9892                 /*-
9893                  * Ok, we have some duplicates or the destination for the
9894                  * sack is unreachable, lets see if we can select an
9895                  * alternate than asoc->last_data_chunk_from
9896                  */
9897                 if ((!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)) &&
9898                     (asoc->used_alt_onsack > asoc->numnets)) {
9899                         /* We used an alt last time, don't this time */
9900                         a_chk->whoTo = NULL;
9901                 } else {
9902                         asoc->used_alt_onsack++;
9903                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
9904                 }
9905                 if (a_chk->whoTo == NULL) {
9906                         /* Nope, no alternate */
9907                         a_chk->whoTo = asoc->last_data_chunk_from;
9908                         asoc->used_alt_onsack = 0;
9909                 }
9910         } else {
9911                 /*
9912                  * No duplicates so we use the last place we received data
9913                  * from.
9914                  */
9915                 asoc->used_alt_onsack = 0;
9916                 a_chk->whoTo = asoc->last_data_chunk_from;
9917         }
9918         if (a_chk->whoTo) {
9919                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
9920         }
9921         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
9922                 highest_tsn = asoc->highest_tsn_inside_map;
9923         } else {
9924                 highest_tsn = asoc->highest_tsn_inside_nr_map;
9925         }
9926         if (highest_tsn == asoc->cumulative_tsn) {
9927                 /* no gaps */
9928                 if (type == SCTP_SELECTIVE_ACK) {
9929                         space_req = sizeof(struct sctp_sack_chunk);
9930                 } else {
9931                         space_req = sizeof(struct sctp_nr_sack_chunk);
9932                 }
9933         } else {
9934                 /* gaps get a cluster */
9935                 space_req = MCLBYTES;
9936         }
9937         /* Ok now lets formulate a MBUF with our sack */
9938         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
9939         if ((a_chk->data == NULL) ||
9940             (a_chk->whoTo == NULL)) {
9941                 /* rats, no mbuf memory */
9942                 if (a_chk->data) {
9943                         /* was a problem with the destination */
9944                         sctp_m_freem(a_chk->data);
9945                         a_chk->data = NULL;
9946                 }
9947                 sctp_free_a_chunk(stcb, a_chk);
9948                 /* sa_ignore NO_NULL_CHK */
9949                 if (stcb->asoc.delayed_ack) {
9950                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
9951                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
9952                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
9953                             stcb->sctp_ep, stcb, NULL);
9954                 } else {
9955                         stcb->asoc.send_sack = 1;
9956                 }
9957                 return;
9958         }
9959         /* ok, lets go through and fill it in */
9960         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
9961         space = M_TRAILINGSPACE(a_chk->data);
9962         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
9963                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
9964         }
9965         limit = mtod(a_chk->data, caddr_t);
9966         limit += space;
9967
9968         flags = 0;
9969
9970         if ((asoc->sctp_cmt_on_off > 0) &&
9971             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
9972                 /*-
9973                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
9974                  * received, then set high bit to 1, else 0. Reset
9975                  * pkts_rcvd.
9976                  */
9977                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
9978                 asoc->cmt_dac_pkts_rcvd = 0;
9979         }
9980 #ifdef SCTP_ASOCLOG_OF_TSNS
9981         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
9982         stcb->asoc.cumack_log_atsnt++;
9983         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
9984                 stcb->asoc.cumack_log_atsnt = 0;
9985         }
9986 #endif
9987         /* reset the readers interpretation */
9988         stcb->freed_by_sorcv_sincelast = 0;
9989
9990         if (type == SCTP_SELECTIVE_ACK) {
9991                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
9992                 nr_sack = NULL;
9993                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
9994                 if (highest_tsn > asoc->mapping_array_base_tsn) {
9995                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
9996                 } else {
9997                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
9998                 }
9999         } else {
10000                 sack = NULL;
10001                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10002                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10003                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10004                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10005                 } else {
10006                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10007                 }
10008         }
10009
10010         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10011                 offset = 1;
10012         } else {
10013                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10014         }
10015         if (((type == SCTP_SELECTIVE_ACK) &&
10016             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10017             ((type == SCTP_NR_SELECTIVE_ACK) &&
10018             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10019                 /* we have a gap .. maybe */
10020                 for (i = 0; i < siz; i++) {
10021                         tsn_map = asoc->mapping_array[i];
10022                         if (type == SCTP_SELECTIVE_ACK) {
10023                                 tsn_map |= asoc->nr_mapping_array[i];
10024                         }
10025                         if (i == 0) {
10026                                 /*
10027                                  * Clear all bits corresponding to TSNs
10028                                  * smaller or equal to the cumulative TSN.
10029                                  */
10030                                 tsn_map &= (~0 << (1 - offset));
10031                         }
10032                         selector = &sack_array[tsn_map];
10033                         if (mergeable && selector->right_edge) {
10034                                 /*
10035                                  * Backup, left and right edges were ok to
10036                                  * merge.
10037                                  */
10038                                 num_gap_blocks--;
10039                                 gap_descriptor--;
10040                         }
10041                         if (selector->num_entries == 0)
10042                                 mergeable = 0;
10043                         else {
10044                                 for (j = 0; j < selector->num_entries; j++) {
10045                                         if (mergeable && selector->right_edge) {
10046                                                 /*
10047                                                  * do a merge by NOT setting
10048                                                  * the left side
10049                                                  */
10050                                                 mergeable = 0;
10051                                         } else {
10052                                                 /*
10053                                                  * no merge, set the left
10054                                                  * side
10055                                                  */
10056                                                 mergeable = 0;
10057                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10058                                         }
10059                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10060                                         num_gap_blocks++;
10061                                         gap_descriptor++;
10062                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10063                                                 /* no more room */
10064                                                 limit_reached = 1;
10065                                                 break;
10066                                         }
10067                                 }
10068                                 if (selector->left_edge) {
10069                                         mergeable = 1;
10070                                 }
10071                         }
10072                         if (limit_reached) {
10073                                 /* Reached the limit stop */
10074                                 break;
10075                         }
10076                         offset += 8;
10077                 }
10078         }
10079         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10080             (limit_reached == 0)) {
10081
10082                 mergeable = 0;
10083
10084                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10085                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10086                 } else {
10087                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10088                 }
10089
10090                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10091                         offset = 1;
10092                 } else {
10093                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10094                 }
10095                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10096                         /* we have a gap .. maybe */
10097                         for (i = 0; i < siz; i++) {
10098                                 tsn_map = asoc->nr_mapping_array[i];
10099                                 if (i == 0) {
10100                                         /*
10101                                          * Clear all bits corresponding to
10102                                          * TSNs smaller or equal to the
10103                                          * cumulative TSN.
10104                                          */
10105                                         tsn_map &= (~0 << (1 - offset));
10106                                 }
10107                                 selector = &sack_array[tsn_map];
10108                                 if (mergeable && selector->right_edge) {
10109                                         /*
10110                                          * Backup, left and right edges were
10111                                          * ok to merge.
10112                                          */
10113                                         num_nr_gap_blocks--;
10114                                         gap_descriptor--;
10115                                 }
10116                                 if (selector->num_entries == 0)
10117                                         mergeable = 0;
10118                                 else {
10119                                         for (j = 0; j < selector->num_entries; j++) {
10120                                                 if (mergeable && selector->right_edge) {
10121                                                         /*
10122                                                          * do a merge by NOT
10123                                                          * setting the left
10124                                                          * side
10125                                                          */
10126                                                         mergeable = 0;
10127                                                 } else {
10128                                                         /*
10129                                                          * no merge, set the
10130                                                          * left side
10131                                                          */
10132                                                         mergeable = 0;
10133                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10134                                                 }
10135                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10136                                                 num_nr_gap_blocks++;
10137                                                 gap_descriptor++;
10138                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10139                                                         /* no more room */
10140                                                         limit_reached = 1;
10141                                                         break;
10142                                                 }
10143                                         }
10144                                         if (selector->left_edge) {
10145                                                 mergeable = 1;
10146                                         }
10147                                 }
10148                                 if (limit_reached) {
10149                                         /* Reached the limit stop */
10150                                         break;
10151                                 }
10152                                 offset += 8;
10153                         }
10154                 }
10155         }
10156         /* now we must add any dups we are going to report. */
10157         if ((limit_reached == 0) && (asoc->numduptsns)) {
10158                 dup = (uint32_t *) gap_descriptor;
10159                 for (i = 0; i < asoc->numduptsns; i++) {
10160                         *dup = htonl(asoc->dup_tsns[i]);
10161                         dup++;
10162                         num_dups++;
10163                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10164                                 /* no more room */
10165                                 break;
10166                         }
10167                 }
10168                 asoc->numduptsns = 0;
10169         }
10170         /*
10171          * now that the chunk is prepared queue it to the control chunk
10172          * queue.
10173          */
10174         if (type == SCTP_SELECTIVE_ACK) {
10175                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10176                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10177                     num_dups * sizeof(int32_t);
10178                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10179                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10180                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10181                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10182                 sack->sack.num_dup_tsns = htons(num_dups);
10183                 sack->ch.chunk_type = type;
10184                 sack->ch.chunk_flags = flags;
10185                 sack->ch.chunk_length = htons(a_chk->send_size);
10186         } else {
10187                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10188                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10189                     num_dups * sizeof(int32_t);
10190                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10191                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10192                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10193                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10194                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10195                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10196                 nr_sack->nr_sack.reserved = 0;
10197                 nr_sack->ch.chunk_type = type;
10198                 nr_sack->ch.chunk_flags = flags;
10199                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10200         }
10201         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10202         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10203         asoc->ctrl_queue_cnt++;
10204         asoc->send_sack = 0;
10205         SCTP_STAT_INCR(sctps_sendsacks);
10206         return;
10207 }
10208
10209 void
10210 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10211 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10212     SCTP_UNUSED
10213 #endif
10214 )
10215 {
10216         struct mbuf *m_abort;
10217         struct mbuf *m_out = NULL, *m_end = NULL;
10218         struct sctp_abort_chunk *abort = NULL;
10219         int sz;
10220         uint32_t auth_offset = 0;
10221         struct sctp_auth_chunk *auth = NULL;
10222
10223         /*-
10224          * Add an AUTH chunk, if chunk requires it and save the offset into
10225          * the chain for AUTH
10226          */
10227         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10228             stcb->asoc.peer_auth_chunks)) {
10229                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10230                     stcb, SCTP_ABORT_ASSOCIATION);
10231                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10232         }
10233         SCTP_TCB_LOCK_ASSERT(stcb);
10234         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10235         if (m_abort == NULL) {
10236                 /* no mbuf's */
10237                 if (m_out)
10238                         sctp_m_freem(m_out);
10239                 return;
10240         }
10241         /* link in any error */
10242         SCTP_BUF_NEXT(m_abort) = operr;
10243         sz = 0;
10244         if (operr) {
10245                 struct mbuf *n;
10246
10247                 n = operr;
10248                 while (n) {
10249                         sz += SCTP_BUF_LEN(n);
10250                         n = SCTP_BUF_NEXT(n);
10251                 }
10252         }
10253         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10254         if (m_out == NULL) {
10255                 /* NO Auth chunk prepended, so reserve space in front */
10256                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10257                 m_out = m_abort;
10258         } else {
10259                 /* Put AUTH chunk at the front of the chain */
10260                 SCTP_BUF_NEXT(m_end) = m_abort;
10261         }
10262
10263         /* fill in the ABORT chunk */
10264         abort = mtod(m_abort, struct sctp_abort_chunk *);
10265         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10266         abort->ch.chunk_flags = 0;
10267         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10268
10269         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
10270             stcb->asoc.primary_destination,
10271             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
10272             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10273             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10274             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10275         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10276 }
10277
10278 void
10279 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10280     struct sctp_nets *net,
10281     int reflect_vtag)
10282 {
10283         /* formulate and SEND a SHUTDOWN-COMPLETE */
10284         struct mbuf *m_shutdown_comp;
10285         struct sctp_shutdown_complete_chunk *shutdown_complete;
10286         uint32_t vtag;
10287         uint8_t flags;
10288
10289         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10290         if (m_shutdown_comp == NULL) {
10291                 /* no mbuf's */
10292                 return;
10293         }
10294         if (reflect_vtag) {
10295                 flags = SCTP_HAD_NO_TCB;
10296                 vtag = stcb->asoc.my_vtag;
10297         } else {
10298                 flags = 0;
10299                 vtag = stcb->asoc.peer_vtag;
10300         }
10301         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10302         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10303         shutdown_complete->ch.chunk_flags = flags;
10304         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10305         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10306         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10307             (struct sockaddr *)&net->ro._l_addr,
10308             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10309             stcb->sctp_ep->sctp_lport, stcb->rport,
10310             htonl(vtag),
10311             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10312         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10313         return;
10314 }
10315
10316 void
10317 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10318     uint32_t vrf_id, uint16_t port)
10319 {
10320         /* formulate and SEND a SHUTDOWN-COMPLETE */
10321         struct mbuf *o_pak;
10322         struct mbuf *mout;
10323         struct ip *iph, *iph_out;
10324         struct udphdr *udp = NULL;
10325
10326 #ifdef INET6
10327         struct ip6_hdr *ip6, *ip6_out;
10328
10329 #endif
10330         int offset_out, len, mlen;
10331         struct sctp_shutdown_complete_msg *comp_cp;
10332
10333         iph = mtod(m, struct ip *);
10334         switch (iph->ip_v) {
10335         case IPVERSION:
10336                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10337                 break;
10338 #ifdef INET6
10339         case IPV6_VERSION >> 4:
10340                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10341                 break;
10342 #endif
10343         default:
10344                 return;
10345         }
10346         if (port) {
10347                 len += sizeof(struct udphdr);
10348         }
10349         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10350         if (mout == NULL) {
10351                 return;
10352         }
10353         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10354         SCTP_BUF_LEN(mout) = len;
10355         SCTP_BUF_NEXT(mout) = NULL;
10356         if (m->m_flags & M_FLOWID) {
10357                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10358                 mout->m_flags |= M_FLOWID;
10359         }
10360         iph_out = NULL;
10361 #ifdef INET6
10362         ip6_out = NULL;
10363 #endif
10364         offset_out = 0;
10365
10366         switch (iph->ip_v) {
10367         case IPVERSION:
10368                 iph_out = mtod(mout, struct ip *);
10369
10370                 /* Fill in the IP header for the ABORT */
10371                 iph_out->ip_v = IPVERSION;
10372                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10373                 iph_out->ip_tos = (u_char)0;
10374                 iph_out->ip_id = 0;
10375                 iph_out->ip_off = 0;
10376                 iph_out->ip_ttl = MAXTTL;
10377                 if (port) {
10378                         iph_out->ip_p = IPPROTO_UDP;
10379                 } else {
10380                         iph_out->ip_p = IPPROTO_SCTP;
10381                 }
10382                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10383                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10384
10385                 /* let IP layer calculate this */
10386                 iph_out->ip_sum = 0;
10387                 offset_out += sizeof(*iph_out);
10388                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10389                     (caddr_t)iph_out + offset_out);
10390                 break;
10391 #ifdef INET6
10392         case IPV6_VERSION >> 4:
10393                 ip6 = (struct ip6_hdr *)iph;
10394                 ip6_out = mtod(mout, struct ip6_hdr *);
10395
10396                 /* Fill in the IPv6 header for the ABORT */
10397                 ip6_out->ip6_flow = ip6->ip6_flow;
10398                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10399                 if (port) {
10400                         ip6_out->ip6_nxt = IPPROTO_UDP;
10401                 } else {
10402                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10403                 }
10404                 ip6_out->ip6_src = ip6->ip6_dst;
10405                 ip6_out->ip6_dst = ip6->ip6_src;
10406                 /*
10407                  * ?? The old code had both the iph len + payload, I think
10408                  * this is wrong and would never have worked
10409                  */
10410                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10411                 offset_out += sizeof(*ip6_out);
10412                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10413                     (caddr_t)ip6_out + offset_out);
10414                 break;
10415 #endif                          /* INET6 */
10416         default:
10417                 /* Currently not supported. */
10418                 sctp_m_freem(mout);
10419                 return;
10420         }
10421         if (port) {
10422                 udp = (struct udphdr *)comp_cp;
10423                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10424                 udp->uh_dport = port;
10425                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10426                 if (iph_out)
10427                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10428                 offset_out += sizeof(struct udphdr);
10429                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10430         }
10431         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10432                 /* no mbuf's */
10433                 sctp_m_freem(mout);
10434                 return;
10435         }
10436         /* Now copy in and fill in the ABORT tags etc. */
10437         comp_cp->sh.src_port = sh->dest_port;
10438         comp_cp->sh.dest_port = sh->src_port;
10439         comp_cp->sh.checksum = 0;
10440         comp_cp->sh.v_tag = sh->v_tag;
10441         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10442         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10443         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10444
10445         if (iph_out != NULL) {
10446                 sctp_route_t ro;
10447                 int ret;
10448
10449                 mlen = SCTP_BUF_LEN(mout);
10450                 bzero(&ro, sizeof ro);
10451                 /* set IPv4 length */
10452                 iph_out->ip_len = mlen;
10453 #ifdef  SCTP_PACKET_LOGGING
10454                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10455                         sctp_packet_log(mout, mlen);
10456 #endif
10457                 if (port) {
10458 #if defined(SCTP_WITH_NO_CSUM)
10459                         SCTP_STAT_INCR(sctps_sendnocrc);
10460 #else
10461                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10462                         SCTP_STAT_INCR(sctps_sendswcrc);
10463 #endif
10464                         SCTP_ENABLE_UDP_CSUM(mout);
10465                 } else {
10466 #if defined(SCTP_WITH_NO_CSUM)
10467                         SCTP_STAT_INCR(sctps_sendnocrc);
10468 #else
10469                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10470                         mout->m_pkthdr.csum_data = 0;
10471                         SCTP_STAT_INCR(sctps_sendhwcrc);
10472 #endif
10473                 }
10474                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10475                 /* out it goes */
10476                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
10477
10478                 /* Free the route if we got one back */
10479                 if (ro.ro_rt)
10480                         RTFREE(ro.ro_rt);
10481         }
10482 #ifdef INET6
10483         if (ip6_out != NULL) {
10484                 struct route_in6 ro;
10485                 int ret;
10486                 struct ifnet *ifp = NULL;
10487
10488                 bzero(&ro, sizeof(ro));
10489                 mlen = SCTP_BUF_LEN(mout);
10490 #ifdef  SCTP_PACKET_LOGGING
10491                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10492                         sctp_packet_log(mout, mlen);
10493 #endif
10494                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10495                 if (port) {
10496 #if defined(SCTP_WITH_NO_CSUM)
10497                         SCTP_STAT_INCR(sctps_sendnocrc);
10498 #else
10499                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
10500                         SCTP_STAT_INCR(sctps_sendswcrc);
10501 #endif
10502                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
10503                                 udp->uh_sum = 0xffff;
10504                         }
10505                 } else {
10506 #if defined(SCTP_WITH_NO_CSUM)
10507                         SCTP_STAT_INCR(sctps_sendnocrc);
10508 #else
10509                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10510                         mout->m_pkthdr.csum_data = 0;
10511                         SCTP_STAT_INCR(sctps_sendhwcrc);
10512 #endif
10513                 }
10514                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
10515
10516                 /* Free the route if we got one back */
10517                 if (ro.ro_rt)
10518                         RTFREE(ro.ro_rt);
10519         }
10520 #endif
10521         SCTP_STAT_INCR(sctps_sendpackets);
10522         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10523         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10524         return;
10525
10526 }
10527
10528 static struct sctp_nets *
10529 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
10530 {
10531         struct sctp_nets *net, *hnet;
10532         int ms_goneby, highest_ms, state_overide = 0;
10533
10534         (void)SCTP_GETTIME_TIMEVAL(now);
10535         highest_ms = 0;
10536         hnet = NULL;
10537         SCTP_TCB_LOCK_ASSERT(stcb);
10538         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
10539                 if (
10540                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
10541                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
10542                     ) {
10543                         /*
10544                          * Skip this guy from consideration if HB is off AND
10545                          * its confirmed
10546                          */
10547                         continue;
10548                 }
10549                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
10550                         /* skip this dest net from consideration */
10551                         continue;
10552                 }
10553                 if (net->last_sent_time.tv_sec) {
10554                         /* Sent to so we subtract */
10555                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
10556                 } else
10557                         /* Never been sent to */
10558                         ms_goneby = 0x7fffffff;
10559                 /*-
10560                  * When the address state is unconfirmed but still
10561                  * considered reachable, we HB at a higher rate. Once it
10562                  * goes confirmed OR reaches the "unreachable" state, thenw
10563                  * we cut it back to HB at a more normal pace.
10564                  */
10565                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
10566                         state_overide = 1;
10567                 } else {
10568                         state_overide = 0;
10569                 }
10570
10571                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
10572                     (ms_goneby > highest_ms)) {
10573                         highest_ms = ms_goneby;
10574                         hnet = net;
10575                 }
10576         }
10577         if (hnet &&
10578             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
10579                 state_overide = 1;
10580         } else {
10581                 state_overide = 0;
10582         }
10583
10584         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
10585                 /*-
10586                  * Found the one with longest delay bounds OR it is
10587                  * unconfirmed and still not marked unreachable.
10588                  */
10589                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
10590 #ifdef SCTP_DEBUG
10591                 if (hnet) {
10592                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
10593                             (struct sockaddr *)&hnet->ro._l_addr);
10594                 } else {
10595                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
10596                 }
10597 #endif
10598                 /* update the timer now */
10599                 hnet->last_sent_time = *now;
10600                 return (hnet);
10601         }
10602         /* Nothing to HB */
10603         return (NULL);
10604 }
10605
10606 int
10607 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
10608 {
10609         struct sctp_tmit_chunk *chk;
10610         struct sctp_nets *net;
10611         struct sctp_heartbeat_chunk *hb;
10612         struct timeval now;
10613         struct sockaddr_in *sin;
10614         struct sockaddr_in6 *sin6;
10615
10616         SCTP_TCB_LOCK_ASSERT(stcb);
10617         if (user_req == 0) {
10618                 net = sctp_select_hb_destination(stcb, &now);
10619                 if (net == NULL) {
10620                         /*-
10621                          * All our busy none to send to, just start the
10622                          * timer again.
10623                          */
10624                         if (stcb->asoc.state == 0) {
10625                                 return (0);
10626                         }
10627                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
10628                             stcb->sctp_ep,
10629                             stcb,
10630                             net);
10631                         return (0);
10632                 }
10633         } else {
10634                 net = u_net;
10635                 if (net == NULL) {
10636                         return (0);
10637                 }
10638                 (void)SCTP_GETTIME_TIMEVAL(&now);
10639         }
10640         sin = (struct sockaddr_in *)&net->ro._l_addr;
10641         if (sin->sin_family != AF_INET) {
10642                 if (sin->sin_family != AF_INET6) {
10643                         /* huh */
10644                         return (0);
10645                 }
10646         }
10647         sctp_alloc_a_chunk(stcb, chk);
10648         if (chk == NULL) {
10649                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
10650                 return (0);
10651         }
10652         chk->copy_by_ref = 0;
10653         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
10654         chk->rec.chunk_id.can_take_data = 1;
10655         chk->asoc = &stcb->asoc;
10656         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
10657
10658         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10659         if (chk->data == NULL) {
10660                 sctp_free_a_chunk(stcb, chk);
10661                 return (0);
10662         }
10663         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10664         SCTP_BUF_LEN(chk->data) = chk->send_size;
10665         chk->sent = SCTP_DATAGRAM_UNSENT;
10666         chk->snd_count = 0;
10667         chk->whoTo = net;
10668         atomic_add_int(&chk->whoTo->ref_count, 1);
10669         /* Now we have a mbuf that we can fill in with the details */
10670         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
10671         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
10672         /* fill out chunk header */
10673         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
10674         hb->ch.chunk_flags = 0;
10675         hb->ch.chunk_length = htons(chk->send_size);
10676         /* Fill out hb parameter */
10677         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
10678         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
10679         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
10680         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
10681         /* Did our user request this one, put it in */
10682         hb->heartbeat.hb_info.user_req = user_req;
10683         hb->heartbeat.hb_info.addr_family = sin->sin_family;
10684         hb->heartbeat.hb_info.addr_len = sin->sin_len;
10685         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
10686                 /*
10687                  * we only take from the entropy pool if the address is not
10688                  * confirmed.
10689                  */
10690                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10691                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
10692         } else {
10693                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
10694                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
10695         }
10696         if (sin->sin_family == AF_INET) {
10697                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
10698         } else if (sin->sin_family == AF_INET6) {
10699                 /* We leave the scope the way it is in our lookup table. */
10700                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
10701                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
10702         } else {
10703                 /* huh compiler bug */
10704                 return (0);
10705         }
10706
10707         /*
10708          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
10709          * PF-heartbeats.  Because of this, threshold management is done by
10710          * the t3 timer handler, and does not need to be done upon the send
10711          * of a PF-heartbeat. If CMT PF is on and the destination to which a
10712          * heartbeat is being sent is in PF state, do NOT do threshold
10713          * management.
10714          */
10715         if ((stcb->asoc.sctp_cmt_pf == 0) ||
10716             ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
10717                 /* ok we have a destination that needs a beat */
10718                 /* lets do the theshold management Qiaobing style */
10719                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
10720                     stcb->asoc.max_send_times)) {
10721                         /*-
10722                          * we have lost the association, in a way this is
10723                          * quite bad since we really are one less time since
10724                          * we really did not send yet. This is the down side
10725                          * to the Q's style as defined in the RFC and not my
10726                          * alternate style defined in the RFC.
10727                          */
10728                         if (chk->data != NULL) {
10729                                 sctp_m_freem(chk->data);
10730                                 chk->data = NULL;
10731                         }
10732                         /*
10733                          * Here we do NOT use the macro since the
10734                          * association is now gone.
10735                          */
10736                         if (chk->whoTo) {
10737                                 sctp_free_remote_addr(chk->whoTo);
10738                                 chk->whoTo = NULL;
10739                         }
10740                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
10741                         return (-1);
10742                 }
10743         }
10744         net->hb_responded = 0;
10745         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10746         stcb->asoc.ctrl_queue_cnt++;
10747         SCTP_STAT_INCR(sctps_sendheartbeat);
10748         /*-
10749          * Call directly med level routine to put out the chunk. It will
10750          * always tumble out control chunks aka HB but it may even tumble
10751          * out data too.
10752          */
10753         return (1);
10754 }
10755
10756 void
10757 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
10758     uint32_t high_tsn)
10759 {
10760         struct sctp_association *asoc;
10761         struct sctp_ecne_chunk *ecne;
10762         struct sctp_tmit_chunk *chk;
10763
10764         asoc = &stcb->asoc;
10765         SCTP_TCB_LOCK_ASSERT(stcb);
10766         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10767                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
10768                         /* found a previous ECN_ECHO update it if needed */
10769                         uint32_t cnt, ctsn;
10770
10771                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10772                         ctsn = ntohl(ecne->tsn);
10773                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
10774                                 ecne->tsn = htonl(high_tsn);
10775                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
10776                         }
10777                         cnt = ntohl(ecne->num_pkts_since_cwr);
10778                         cnt++;
10779                         ecne->num_pkts_since_cwr = htonl(cnt);
10780                         return;
10781                 }
10782         }
10783         /* nope could not find one to update so we must build one */
10784         sctp_alloc_a_chunk(stcb, chk);
10785         if (chk == NULL) {
10786                 return;
10787         }
10788         chk->copy_by_ref = 0;
10789         SCTP_STAT_INCR(sctps_queue_upd_ecne);
10790         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
10791         chk->rec.chunk_id.can_take_data = 0;
10792         chk->asoc = &stcb->asoc;
10793         chk->send_size = sizeof(struct sctp_ecne_chunk);
10794         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10795         if (chk->data == NULL) {
10796                 sctp_free_a_chunk(stcb, chk);
10797                 return;
10798         }
10799         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10800         SCTP_BUF_LEN(chk->data) = chk->send_size;
10801         chk->sent = SCTP_DATAGRAM_UNSENT;
10802         chk->snd_count = 0;
10803         chk->whoTo = net;
10804         atomic_add_int(&chk->whoTo->ref_count, 1);
10805         stcb->asoc.ecn_echo_cnt_onq++;
10806         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
10807         ecne->ch.chunk_type = SCTP_ECN_ECHO;
10808         ecne->ch.chunk_flags = 0;
10809         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
10810         ecne->tsn = htonl(high_tsn);
10811         ecne->num_pkts_since_cwr = htonl(1);
10812         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
10813         asoc->ctrl_queue_cnt++;
10814 }
10815
10816 void
10817 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
10818     struct mbuf *m, int iphlen, int bad_crc)
10819 {
10820         struct sctp_association *asoc;
10821         struct sctp_pktdrop_chunk *drp;
10822         struct sctp_tmit_chunk *chk;
10823         uint8_t *datap;
10824         int len;
10825         int was_trunc = 0;
10826         struct ip *iph;
10827
10828 #ifdef INET6
10829         struct ip6_hdr *ip6h;
10830
10831 #endif
10832         int fullsz = 0, extra = 0;
10833         long spc;
10834         int offset;
10835         struct sctp_chunkhdr *ch, chunk_buf;
10836         unsigned int chk_length;
10837
10838         if (!stcb) {
10839                 return;
10840         }
10841         asoc = &stcb->asoc;
10842         SCTP_TCB_LOCK_ASSERT(stcb);
10843         if (asoc->peer_supports_pktdrop == 0) {
10844                 /*-
10845                  * peer must declare support before I send one.
10846                  */
10847                 return;
10848         }
10849         if (stcb->sctp_socket == NULL) {
10850                 return;
10851         }
10852         sctp_alloc_a_chunk(stcb, chk);
10853         if (chk == NULL) {
10854                 return;
10855         }
10856         chk->copy_by_ref = 0;
10857         iph = mtod(m, struct ip *);
10858         if (iph == NULL) {
10859                 sctp_free_a_chunk(stcb, chk);
10860                 return;
10861         }
10862         switch (iph->ip_v) {
10863         case IPVERSION:
10864                 /* IPv4 */
10865                 len = chk->send_size = iph->ip_len;
10866                 break;
10867 #ifdef INET6
10868         case IPV6_VERSION >> 4:
10869                 /* IPv6 */
10870                 ip6h = mtod(m, struct ip6_hdr *);
10871                 len = chk->send_size = htons(ip6h->ip6_plen);
10872                 break;
10873 #endif
10874         default:
10875                 return;
10876         }
10877         /* Validate that we do not have an ABORT in here. */
10878         offset = iphlen + sizeof(struct sctphdr);
10879         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10880             sizeof(*ch), (uint8_t *) & chunk_buf);
10881         while (ch != NULL) {
10882                 chk_length = ntohs(ch->chunk_length);
10883                 if (chk_length < sizeof(*ch)) {
10884                         /* break to abort land */
10885                         break;
10886                 }
10887                 switch (ch->chunk_type) {
10888                 case SCTP_PACKET_DROPPED:
10889                 case SCTP_ABORT_ASSOCIATION:
10890                 case SCTP_INITIATION_ACK:
10891                         /**
10892                          * We don't respond with an PKT-DROP to an ABORT
10893                          * or PKT-DROP. We also do not respond to an
10894                          * INIT-ACK, because we can't know if the initiation
10895                          * tag is correct or not.
10896                          */
10897                         sctp_free_a_chunk(stcb, chk);
10898                         return;
10899                 default:
10900                         break;
10901                 }
10902                 offset += SCTP_SIZE32(chk_length);
10903                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10904                     sizeof(*ch), (uint8_t *) & chunk_buf);
10905         }
10906
10907         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10908             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10909                 /*
10910                  * only send 1 mtu worth, trim off the excess on the end.
10911                  */
10912                 fullsz = len - extra;
10913                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10914                 was_trunc = 1;
10915         }
10916         chk->asoc = &stcb->asoc;
10917         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10918         if (chk->data == NULL) {
10919 jump_out:
10920                 sctp_free_a_chunk(stcb, chk);
10921                 return;
10922         }
10923         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10924         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10925         if (drp == NULL) {
10926                 sctp_m_freem(chk->data);
10927                 chk->data = NULL;
10928                 goto jump_out;
10929         }
10930         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10931             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10932         chk->book_size_scale = 0;
10933         if (was_trunc) {
10934                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10935                 drp->trunc_len = htons(fullsz);
10936                 /*
10937                  * Len is already adjusted to size minus overhead above take
10938                  * out the pkt_drop chunk itself from it.
10939                  */
10940                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10941                 len = chk->send_size;
10942         } else {
10943                 /* no truncation needed */
10944                 drp->ch.chunk_flags = 0;
10945                 drp->trunc_len = htons(0);
10946         }
10947         if (bad_crc) {
10948                 drp->ch.chunk_flags |= SCTP_BADCRC;
10949         }
10950         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10951         SCTP_BUF_LEN(chk->data) = chk->send_size;
10952         chk->sent = SCTP_DATAGRAM_UNSENT;
10953         chk->snd_count = 0;
10954         if (net) {
10955                 /* we should hit here */
10956                 chk->whoTo = net;
10957         } else {
10958                 chk->whoTo = asoc->primary_destination;
10959         }
10960         atomic_add_int(&chk->whoTo->ref_count, 1);
10961         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10962         chk->rec.chunk_id.can_take_data = 1;
10963         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10964         drp->ch.chunk_length = htons(chk->send_size);
10965         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10966         if (spc < 0) {
10967                 spc = 0;
10968         }
10969         drp->bottle_bw = htonl(spc);
10970         if (asoc->my_rwnd) {
10971                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10972                     asoc->size_on_all_streams +
10973                     asoc->my_rwnd_control_len +
10974                     stcb->sctp_socket->so_rcv.sb_cc);
10975         } else {
10976                 /*-
10977                  * If my rwnd is 0, possibly from mbuf depletion as well as
10978                  * space used, tell the peer there is NO space aka onq == bw
10979                  */
10980                 drp->current_onq = htonl(spc);
10981         }
10982         drp->reserved = 0;
10983         datap = drp->data;
10984         m_copydata(m, iphlen, len, (caddr_t)datap);
10985         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10986         asoc->ctrl_queue_cnt++;
10987 }
10988
10989 void
10990 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
10991 {
10992         struct sctp_association *asoc;
10993         struct sctp_cwr_chunk *cwr;
10994         struct sctp_tmit_chunk *chk;
10995
10996         asoc = &stcb->asoc;
10997         SCTP_TCB_LOCK_ASSERT(stcb);
10998
10999
11000         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11001                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11002                         /*
11003                          * found a previous CWR queued to same destination
11004                          * update it if needed
11005                          */
11006                         uint32_t ctsn;
11007
11008                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11009                         ctsn = ntohl(cwr->tsn);
11010                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11011                                 cwr->tsn = htonl(high_tsn);
11012                         }
11013                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11014                                 /* Make sure override is carried */
11015                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11016                         }
11017                         return;
11018                 }
11019         }
11020         sctp_alloc_a_chunk(stcb, chk);
11021         if (chk == NULL) {
11022                 return;
11023         }
11024         chk->copy_by_ref = 0;
11025         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11026         chk->rec.chunk_id.can_take_data = 1;
11027         chk->asoc = &stcb->asoc;
11028         chk->send_size = sizeof(struct sctp_cwr_chunk);
11029         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11030         if (chk->data == NULL) {
11031                 sctp_free_a_chunk(stcb, chk);
11032                 return;
11033         }
11034         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11035         SCTP_BUF_LEN(chk->data) = chk->send_size;
11036         chk->sent = SCTP_DATAGRAM_UNSENT;
11037         chk->snd_count = 0;
11038         chk->whoTo = net;
11039         atomic_add_int(&chk->whoTo->ref_count, 1);
11040         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11041         cwr->ch.chunk_type = SCTP_ECN_CWR;
11042         cwr->ch.chunk_flags = override;
11043         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11044         cwr->tsn = htonl(high_tsn);
11045         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11046         asoc->ctrl_queue_cnt++;
11047 }
11048
11049 void
11050 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11051     int number_entries, uint16_t * list,
11052     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11053 {
11054         int len, old_len, i;
11055         struct sctp_stream_reset_out_request *req_out;
11056         struct sctp_chunkhdr *ch;
11057
11058         ch = mtod(chk->data, struct sctp_chunkhdr *);
11059
11060
11061         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11062
11063         /* get to new offset for the param. */
11064         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11065         /* now how long will this param be? */
11066         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11067         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11068         req_out->ph.param_length = htons(len);
11069         req_out->request_seq = htonl(seq);
11070         req_out->response_seq = htonl(resp_seq);
11071         req_out->send_reset_at_tsn = htonl(last_sent);
11072         if (number_entries) {
11073                 for (i = 0; i < number_entries; i++) {
11074                         req_out->list_of_streams[i] = htons(list[i]);
11075                 }
11076         }
11077         if (SCTP_SIZE32(len) > len) {
11078                 /*-
11079                  * Need to worry about the pad we may end up adding to the
11080                  * end. This is easy since the struct is either aligned to 4
11081                  * bytes or 2 bytes off.
11082                  */
11083                 req_out->list_of_streams[number_entries] = 0;
11084         }
11085         /* now fix the chunk length */
11086         ch->chunk_length = htons(len + old_len);
11087         chk->book_size = len + old_len;
11088         chk->book_size_scale = 0;
11089         chk->send_size = SCTP_SIZE32(chk->book_size);
11090         SCTP_BUF_LEN(chk->data) = chk->send_size;
11091         return;
11092 }
11093
11094
11095 void
11096 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11097     int number_entries, uint16_t * list,
11098     uint32_t seq)
11099 {
11100         int len, old_len, i;
11101         struct sctp_stream_reset_in_request *req_in;
11102         struct sctp_chunkhdr *ch;
11103
11104         ch = mtod(chk->data, struct sctp_chunkhdr *);
11105
11106
11107         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11108
11109         /* get to new offset for the param. */
11110         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11111         /* now how long will this param be? */
11112         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11113         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11114         req_in->ph.param_length = htons(len);
11115         req_in->request_seq = htonl(seq);
11116         if (number_entries) {
11117                 for (i = 0; i < number_entries; i++) {
11118                         req_in->list_of_streams[i] = htons(list[i]);
11119                 }
11120         }
11121         if (SCTP_SIZE32(len) > len) {
11122                 /*-
11123                  * Need to worry about the pad we may end up adding to the
11124                  * end. This is easy since the struct is either aligned to 4
11125                  * bytes or 2 bytes off.
11126                  */
11127                 req_in->list_of_streams[number_entries] = 0;
11128         }
11129         /* now fix the chunk length */
11130         ch->chunk_length = htons(len + old_len);
11131         chk->book_size = len + old_len;
11132         chk->book_size_scale = 0;
11133         chk->send_size = SCTP_SIZE32(chk->book_size);
11134         SCTP_BUF_LEN(chk->data) = chk->send_size;
11135         return;
11136 }
11137
11138
11139 void
11140 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11141     uint32_t seq)
11142 {
11143         int len, old_len;
11144         struct sctp_stream_reset_tsn_request *req_tsn;
11145         struct sctp_chunkhdr *ch;
11146
11147         ch = mtod(chk->data, struct sctp_chunkhdr *);
11148
11149
11150         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11151
11152         /* get to new offset for the param. */
11153         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11154         /* now how long will this param be? */
11155         len = sizeof(struct sctp_stream_reset_tsn_request);
11156         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11157         req_tsn->ph.param_length = htons(len);
11158         req_tsn->request_seq = htonl(seq);
11159
11160         /* now fix the chunk length */
11161         ch->chunk_length = htons(len + old_len);
11162         chk->send_size = len + old_len;
11163         chk->book_size = SCTP_SIZE32(chk->send_size);
11164         chk->book_size_scale = 0;
11165         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11166         return;
11167 }
11168
11169 void
11170 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11171     uint32_t resp_seq, uint32_t result)
11172 {
11173         int len, old_len;
11174         struct sctp_stream_reset_response *resp;
11175         struct sctp_chunkhdr *ch;
11176
11177         ch = mtod(chk->data, struct sctp_chunkhdr *);
11178
11179
11180         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11181
11182         /* get to new offset for the param. */
11183         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11184         /* now how long will this param be? */
11185         len = sizeof(struct sctp_stream_reset_response);
11186         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11187         resp->ph.param_length = htons(len);
11188         resp->response_seq = htonl(resp_seq);
11189         resp->result = ntohl(result);
11190
11191         /* now fix the chunk length */
11192         ch->chunk_length = htons(len + old_len);
11193         chk->book_size = len + old_len;
11194         chk->book_size_scale = 0;
11195         chk->send_size = SCTP_SIZE32(chk->book_size);
11196         SCTP_BUF_LEN(chk->data) = chk->send_size;
11197         return;
11198
11199 }
11200
11201
11202 void
11203 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11204     uint32_t resp_seq, uint32_t result,
11205     uint32_t send_una, uint32_t recv_next)
11206 {
11207         int len, old_len;
11208         struct sctp_stream_reset_response_tsn *resp;
11209         struct sctp_chunkhdr *ch;
11210
11211         ch = mtod(chk->data, struct sctp_chunkhdr *);
11212
11213
11214         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11215
11216         /* get to new offset for the param. */
11217         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11218         /* now how long will this param be? */
11219         len = sizeof(struct sctp_stream_reset_response_tsn);
11220         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11221         resp->ph.param_length = htons(len);
11222         resp->response_seq = htonl(resp_seq);
11223         resp->result = htonl(result);
11224         resp->senders_next_tsn = htonl(send_una);
11225         resp->receivers_next_tsn = htonl(recv_next);
11226
11227         /* now fix the chunk length */
11228         ch->chunk_length = htons(len + old_len);
11229         chk->book_size = len + old_len;
11230         chk->send_size = SCTP_SIZE32(chk->book_size);
11231         chk->book_size_scale = 0;
11232         SCTP_BUF_LEN(chk->data) = chk->send_size;
11233         return;
11234 }
11235
11236 static void
11237 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11238     uint32_t seq,
11239     uint16_t adding)
11240 {
11241         int len, old_len;
11242         struct sctp_chunkhdr *ch;
11243         struct sctp_stream_reset_add_strm *addstr;
11244
11245         ch = mtod(chk->data, struct sctp_chunkhdr *);
11246         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11247
11248         /* get to new offset for the param. */
11249         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11250         /* now how long will this param be? */
11251         len = sizeof(struct sctp_stream_reset_add_strm);
11252
11253         /* Fill it out. */
11254         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11255         addstr->ph.param_length = htons(len);
11256         addstr->request_seq = htonl(seq);
11257         addstr->number_of_streams = htons(adding);
11258         addstr->reserved = 0;
11259
11260         /* now fix the chunk length */
11261         ch->chunk_length = htons(len + old_len);
11262         chk->send_size = len + old_len;
11263         chk->book_size = SCTP_SIZE32(chk->send_size);
11264         chk->book_size_scale = 0;
11265         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11266         return;
11267 }
11268
11269 int
11270 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11271     int number_entries, uint16_t * list,
11272     uint8_t send_out_req,
11273     uint32_t resp_seq,
11274     uint8_t send_in_req,
11275     uint8_t send_tsn_req,
11276     uint8_t add_stream,
11277     uint16_t adding
11278 )
11279 {
11280
11281         struct sctp_association *asoc;
11282         struct sctp_tmit_chunk *chk;
11283         struct sctp_chunkhdr *ch;
11284         uint32_t seq;
11285
11286         asoc = &stcb->asoc;
11287         if (asoc->stream_reset_outstanding) {
11288                 /*-
11289                  * Already one pending, must get ACK back to clear the flag.
11290                  */
11291                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11292                 return (EBUSY);
11293         }
11294         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11295             (add_stream == 0)) {
11296                 /* nothing to do */
11297                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11298                 return (EINVAL);
11299         }
11300         if (send_tsn_req && (send_out_req || send_in_req)) {
11301                 /* error, can't do that */
11302                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11303                 return (EINVAL);
11304         }
11305         sctp_alloc_a_chunk(stcb, chk);
11306         if (chk == NULL) {
11307                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11308                 return (ENOMEM);
11309         }
11310         chk->copy_by_ref = 0;
11311         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11312         chk->rec.chunk_id.can_take_data = 0;
11313         chk->asoc = &stcb->asoc;
11314         chk->book_size = sizeof(struct sctp_chunkhdr);
11315         chk->send_size = SCTP_SIZE32(chk->book_size);
11316         chk->book_size_scale = 0;
11317
11318         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11319         if (chk->data == NULL) {
11320                 sctp_free_a_chunk(stcb, chk);
11321                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11322                 return (ENOMEM);
11323         }
11324         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11325
11326         /* setup chunk parameters */
11327         chk->sent = SCTP_DATAGRAM_UNSENT;
11328         chk->snd_count = 0;
11329         chk->whoTo = asoc->primary_destination;
11330         atomic_add_int(&chk->whoTo->ref_count, 1);
11331
11332         ch = mtod(chk->data, struct sctp_chunkhdr *);
11333         ch->chunk_type = SCTP_STREAM_RESET;
11334         ch->chunk_flags = 0;
11335         ch->chunk_length = htons(chk->book_size);
11336         SCTP_BUF_LEN(chk->data) = chk->send_size;
11337
11338         seq = stcb->asoc.str_reset_seq_out;
11339         if (send_out_req) {
11340                 sctp_add_stream_reset_out(chk, number_entries, list,
11341                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11342                 asoc->stream_reset_out_is_outstanding = 1;
11343                 seq++;
11344                 asoc->stream_reset_outstanding++;
11345         }
11346         if (add_stream) {
11347                 sctp_add_a_stream(chk, seq, adding);
11348                 seq++;
11349                 asoc->stream_reset_outstanding++;
11350         }
11351         if (send_in_req) {
11352                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11353                 asoc->stream_reset_outstanding++;
11354         }
11355         if (send_tsn_req) {
11356                 sctp_add_stream_reset_tsn(chk, seq);
11357                 asoc->stream_reset_outstanding++;
11358         }
11359         asoc->str_reset = chk;
11360
11361         /* insert the chunk for sending */
11362         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11363             chk,
11364             sctp_next);
11365         asoc->ctrl_queue_cnt++;
11366         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11367         return (0);
11368 }
11369
11370 void
11371 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11372     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11373 {
11374         /*-
11375          * Formulate the abort message, and send it back down.
11376          */
11377         struct mbuf *o_pak;
11378         struct mbuf *mout;
11379         struct sctp_abort_msg *abm;
11380         struct ip *iph, *iph_out;
11381         struct udphdr *udp;
11382
11383 #ifdef INET6
11384         struct ip6_hdr *ip6, *ip6_out;
11385
11386 #endif
11387         int iphlen_out, len;
11388
11389         /* don't respond to ABORT with ABORT */
11390         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11391                 if (err_cause)
11392                         sctp_m_freem(err_cause);
11393                 return;
11394         }
11395         iph = mtod(m, struct ip *);
11396         switch (iph->ip_v) {
11397         case IPVERSION:
11398                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11399                 break;
11400 #ifdef INET6
11401         case IPV6_VERSION >> 4:
11402                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11403                 break;
11404 #endif
11405         default:
11406                 if (err_cause) {
11407                         sctp_m_freem(err_cause);
11408                 }
11409                 return;
11410         }
11411         if (port) {
11412                 len += sizeof(struct udphdr);
11413         }
11414         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11415         if (mout == NULL) {
11416                 if (err_cause) {
11417                         sctp_m_freem(err_cause);
11418                 }
11419                 return;
11420         }
11421         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11422         SCTP_BUF_LEN(mout) = len;
11423         SCTP_BUF_NEXT(mout) = err_cause;
11424         if (m->m_flags & M_FLOWID) {
11425                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11426                 mout->m_flags |= M_FLOWID;
11427         }
11428         iph_out = NULL;
11429 #ifdef INET6
11430         ip6_out = NULL;
11431 #endif
11432         switch (iph->ip_v) {
11433         case IPVERSION:
11434                 iph_out = mtod(mout, struct ip *);
11435
11436                 /* Fill in the IP header for the ABORT */
11437                 iph_out->ip_v = IPVERSION;
11438                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11439                 iph_out->ip_tos = (u_char)0;
11440                 iph_out->ip_id = 0;
11441                 iph_out->ip_off = 0;
11442                 iph_out->ip_ttl = MAXTTL;
11443                 if (port) {
11444                         iph_out->ip_p = IPPROTO_UDP;
11445                 } else {
11446                         iph_out->ip_p = IPPROTO_SCTP;
11447                 }
11448                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11449                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11450                 /* let IP layer calculate this */
11451                 iph_out->ip_sum = 0;
11452
11453                 iphlen_out = sizeof(*iph_out);
11454                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11455                 break;
11456 #ifdef INET6
11457         case IPV6_VERSION >> 4:
11458                 ip6 = (struct ip6_hdr *)iph;
11459                 ip6_out = mtod(mout, struct ip6_hdr *);
11460
11461                 /* Fill in the IP6 header for the ABORT */
11462                 ip6_out->ip6_flow = ip6->ip6_flow;
11463                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11464                 if (port) {
11465                         ip6_out->ip6_nxt = IPPROTO_UDP;
11466                 } else {
11467                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11468                 }
11469                 ip6_out->ip6_src = ip6->ip6_dst;
11470                 ip6_out->ip6_dst = ip6->ip6_src;
11471
11472                 iphlen_out = sizeof(*ip6_out);
11473                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11474                 break;
11475 #endif                          /* INET6 */
11476         default:
11477                 /* Currently not supported */
11478                 sctp_m_freem(mout);
11479                 return;
11480         }
11481
11482         udp = (struct udphdr *)abm;
11483         if (port) {
11484                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11485                 udp->uh_dport = port;
11486                 /* set udp->uh_ulen later */
11487                 udp->uh_sum = 0;
11488                 iphlen_out += sizeof(struct udphdr);
11489                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11490         }
11491         abm->sh.src_port = sh->dest_port;
11492         abm->sh.dest_port = sh->src_port;
11493         abm->sh.checksum = 0;
11494         if (vtag == 0) {
11495                 abm->sh.v_tag = sh->v_tag;
11496                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11497         } else {
11498                 abm->sh.v_tag = htonl(vtag);
11499                 abm->msg.ch.chunk_flags = 0;
11500         }
11501         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11502
11503         if (err_cause) {
11504                 struct mbuf *m_tmp = err_cause;
11505                 int err_len = 0;
11506
11507                 /* get length of the err_cause chain */
11508                 while (m_tmp != NULL) {
11509                         err_len += SCTP_BUF_LEN(m_tmp);
11510                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11511                 }
11512                 len = SCTP_BUF_LEN(mout) + err_len;
11513                 if (err_len % 4) {
11514                         /* need pad at end of chunk */
11515                         uint32_t cpthis = 0;
11516                         int padlen;
11517
11518                         padlen = 4 - (len % 4);
11519                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11520                         len += padlen;
11521                 }
11522                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11523         } else {
11524                 len = SCTP_BUF_LEN(mout);
11525                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11526         }
11527
11528         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11529                 /* no mbuf's */
11530                 sctp_m_freem(mout);
11531                 return;
11532         }
11533         if (iph_out != NULL) {
11534                 sctp_route_t ro;
11535                 int ret;
11536
11537                 /* zap the stack pointer to the route */
11538                 bzero(&ro, sizeof ro);
11539                 if (port) {
11540                         udp->uh_ulen = htons(len - sizeof(struct ip));
11541                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11542                 }
11543                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11544                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11545                 /* set IPv4 length */
11546                 iph_out->ip_len = len;
11547                 /* out it goes */
11548 #ifdef  SCTP_PACKET_LOGGING
11549                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11550                         sctp_packet_log(mout, len);
11551 #endif
11552                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11553                 if (port) {
11554 #if defined(SCTP_WITH_NO_CSUM)
11555                         SCTP_STAT_INCR(sctps_sendnocrc);
11556 #else
11557                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11558                         SCTP_STAT_INCR(sctps_sendswcrc);
11559 #endif
11560                         SCTP_ENABLE_UDP_CSUM(o_pak);
11561                 } else {
11562 #if defined(SCTP_WITH_NO_CSUM)
11563                         SCTP_STAT_INCR(sctps_sendnocrc);
11564 #else
11565                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11566                         mout->m_pkthdr.csum_data = 0;
11567                         SCTP_STAT_INCR(sctps_sendhwcrc);
11568 #endif
11569                 }
11570                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11571
11572                 /* Free the route if we got one back */
11573                 if (ro.ro_rt)
11574                         RTFREE(ro.ro_rt);
11575         }
11576 #ifdef INET6
11577         if (ip6_out != NULL) {
11578                 struct route_in6 ro;
11579                 int ret;
11580                 struct ifnet *ifp = NULL;
11581
11582                 /* zap the stack pointer to the route */
11583                 bzero(&ro, sizeof(ro));
11584                 if (port) {
11585                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11586                 }
11587                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
11588                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
11589                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11590 #ifdef  SCTP_PACKET_LOGGING
11591                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11592                         sctp_packet_log(mout, len);
11593 #endif
11594                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11595                 if (port) {
11596 #if defined(SCTP_WITH_NO_CSUM)
11597                         SCTP_STAT_INCR(sctps_sendnocrc);
11598 #else
11599                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11600                         SCTP_STAT_INCR(sctps_sendswcrc);
11601 #endif
11602                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11603                                 udp->uh_sum = 0xffff;
11604                         }
11605                 } else {
11606 #if defined(SCTP_WITH_NO_CSUM)
11607                         SCTP_STAT_INCR(sctps_sendnocrc);
11608 #else
11609                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11610                         mout->m_pkthdr.csum_data = 0;
11611                         SCTP_STAT_INCR(sctps_sendhwcrc);
11612 #endif
11613                 }
11614                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11615
11616                 /* Free the route if we got one back */
11617                 if (ro.ro_rt)
11618                         RTFREE(ro.ro_rt);
11619         }
11620 #endif
11621         SCTP_STAT_INCR(sctps_sendpackets);
11622         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11623         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11624 }
11625
11626 void
11627 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
11628     uint32_t vrf_id, uint16_t port)
11629 {
11630         struct mbuf *o_pak;
11631         struct sctphdr *sh, *sh_out;
11632         struct sctp_chunkhdr *ch;
11633         struct ip *iph, *iph_out;
11634         struct udphdr *udp = NULL;
11635         struct mbuf *mout;
11636
11637 #ifdef INET6
11638         struct ip6_hdr *ip6, *ip6_out;
11639
11640 #endif
11641         int iphlen_out, len;
11642
11643         iph = mtod(m, struct ip *);
11644         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
11645         switch (iph->ip_v) {
11646         case IPVERSION:
11647                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11648                 break;
11649 #ifdef INET6
11650         case IPV6_VERSION >> 4:
11651                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
11652                 break;
11653 #endif
11654         default:
11655                 if (scm) {
11656                         sctp_m_freem(scm);
11657                 }
11658                 return;
11659         }
11660         if (port) {
11661                 len += sizeof(struct udphdr);
11662         }
11663         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11664         if (mout == NULL) {
11665                 if (scm) {
11666                         sctp_m_freem(scm);
11667                 }
11668                 return;
11669         }
11670         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11671         SCTP_BUF_LEN(mout) = len;
11672         SCTP_BUF_NEXT(mout) = scm;
11673         if (m->m_flags & M_FLOWID) {
11674                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11675                 mout->m_flags |= M_FLOWID;
11676         }
11677         iph_out = NULL;
11678 #ifdef INET6
11679         ip6_out = NULL;
11680 #endif
11681         switch (iph->ip_v) {
11682         case IPVERSION:
11683                 iph_out = mtod(mout, struct ip *);
11684
11685                 /* Fill in the IP header for the ABORT */
11686                 iph_out->ip_v = IPVERSION;
11687                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11688                 iph_out->ip_tos = (u_char)0;
11689                 iph_out->ip_id = 0;
11690                 iph_out->ip_off = 0;
11691                 iph_out->ip_ttl = MAXTTL;
11692                 if (port) {
11693                         iph_out->ip_p = IPPROTO_UDP;
11694                 } else {
11695                         iph_out->ip_p = IPPROTO_SCTP;
11696                 }
11697                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11698                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11699                 /* let IP layer calculate this */
11700                 iph_out->ip_sum = 0;
11701
11702                 iphlen_out = sizeof(struct ip);
11703                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
11704                 break;
11705 #ifdef INET6
11706         case IPV6_VERSION >> 4:
11707                 ip6 = (struct ip6_hdr *)iph;
11708                 ip6_out = mtod(mout, struct ip6_hdr *);
11709
11710                 /* Fill in the IP6 header for the ABORT */
11711                 ip6_out->ip6_flow = ip6->ip6_flow;
11712                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11713                 if (port) {
11714                         ip6_out->ip6_nxt = IPPROTO_UDP;
11715                 } else {
11716                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11717                 }
11718                 ip6_out->ip6_src = ip6->ip6_dst;
11719                 ip6_out->ip6_dst = ip6->ip6_src;
11720
11721                 iphlen_out = sizeof(struct ip6_hdr);
11722                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
11723                 break;
11724 #endif                          /* INET6 */
11725         default:
11726                 /* Currently not supported */
11727                 sctp_m_freem(mout);
11728                 return;
11729         }
11730
11731         udp = (struct udphdr *)sh_out;
11732         if (port) {
11733                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11734                 udp->uh_dport = port;
11735                 /* set udp->uh_ulen later */
11736                 udp->uh_sum = 0;
11737                 iphlen_out += sizeof(struct udphdr);
11738                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
11739         }
11740         sh_out->src_port = sh->dest_port;
11741         sh_out->dest_port = sh->src_port;
11742         sh_out->v_tag = vtag;
11743         sh_out->checksum = 0;
11744
11745         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
11746         ch->chunk_type = SCTP_OPERATION_ERROR;
11747         ch->chunk_flags = 0;
11748
11749         if (scm) {
11750                 struct mbuf *m_tmp = scm;
11751                 int cause_len = 0;
11752
11753                 /* get length of the err_cause chain */
11754                 while (m_tmp != NULL) {
11755                         cause_len += SCTP_BUF_LEN(m_tmp);
11756                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11757                 }
11758                 len = SCTP_BUF_LEN(mout) + cause_len;
11759                 if (cause_len % 4) {
11760                         /* need pad at end of chunk */
11761                         uint32_t cpthis = 0;
11762                         int padlen;
11763
11764                         padlen = 4 - (len % 4);
11765                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11766                         len += padlen;
11767                 }
11768                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11769         } else {
11770                 len = SCTP_BUF_LEN(mout);
11771                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
11772         }
11773
11774         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11775                 /* no mbuf's */
11776                 sctp_m_freem(mout);
11777                 return;
11778         }
11779         if (iph_out != NULL) {
11780                 sctp_route_t ro;
11781                 int ret;
11782
11783                 /* zap the stack pointer to the route */
11784                 bzero(&ro, sizeof ro);
11785                 if (port) {
11786                         udp->uh_ulen = htons(len - sizeof(struct ip));
11787                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11788                 }
11789                 /* set IPv4 length */
11790                 iph_out->ip_len = len;
11791                 /* out it goes */
11792 #ifdef  SCTP_PACKET_LOGGING
11793                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11794                         sctp_packet_log(mout, len);
11795 #endif
11796                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11797                 if (port) {
11798 #if defined(SCTP_WITH_NO_CSUM)
11799                         SCTP_STAT_INCR(sctps_sendnocrc);
11800 #else
11801                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
11802                         SCTP_STAT_INCR(sctps_sendswcrc);
11803 #endif
11804                         SCTP_ENABLE_UDP_CSUM(o_pak);
11805                 } else {
11806 #if defined(SCTP_WITH_NO_CSUM)
11807                         SCTP_STAT_INCR(sctps_sendnocrc);
11808 #else
11809                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11810                         mout->m_pkthdr.csum_data = 0;
11811                         SCTP_STAT_INCR(sctps_sendhwcrc);
11812 #endif
11813                 }
11814                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11815
11816                 /* Free the route if we got one back */
11817                 if (ro.ro_rt)
11818                         RTFREE(ro.ro_rt);
11819         }
11820 #ifdef INET6
11821         if (ip6_out != NULL) {
11822                 struct route_in6 ro;
11823                 int ret;
11824                 struct ifnet *ifp = NULL;
11825
11826                 /* zap the stack pointer to the route */
11827                 bzero(&ro, sizeof(ro));
11828                 if (port) {
11829                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
11830                 }
11831                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
11832 #ifdef  SCTP_PACKET_LOGGING
11833                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11834                         sctp_packet_log(mout, len);
11835 #endif
11836                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11837                 if (port) {
11838 #if defined(SCTP_WITH_NO_CSUM)
11839                         SCTP_STAT_INCR(sctps_sendnocrc);
11840 #else
11841                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11842                         SCTP_STAT_INCR(sctps_sendswcrc);
11843 #endif
11844                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11845                                 udp->uh_sum = 0xffff;
11846                         }
11847                 } else {
11848 #if defined(SCTP_WITH_NO_CSUM)
11849                         SCTP_STAT_INCR(sctps_sendnocrc);
11850 #else
11851                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11852                         mout->m_pkthdr.csum_data = 0;
11853                         SCTP_STAT_INCR(sctps_sendhwcrc);
11854 #endif
11855                 }
11856                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11857
11858                 /* Free the route if we got one back */
11859                 if (ro.ro_rt)
11860                         RTFREE(ro.ro_rt);
11861         }
11862 #endif
11863         SCTP_STAT_INCR(sctps_sendpackets);
11864         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11865         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11866 }
11867
11868 static struct mbuf *
11869 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
11870     struct uio *uio,
11871     struct sctp_sndrcvinfo *srcv,
11872     int max_send_len,
11873     int user_marks_eor,
11874     int *error,
11875     uint32_t * sndout,
11876     struct mbuf **new_tail)
11877 {
11878         struct mbuf *m;
11879
11880         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11881             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11882         if (m == NULL) {
11883                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11884                 *error = ENOMEM;
11885         } else {
11886                 *sndout = m_length(m, NULL);
11887                 *new_tail = m_last(m);
11888         }
11889         return (m);
11890 }
11891
11892 static int
11893 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11894     struct uio *uio,
11895     int resv_upfront)
11896 {
11897         int left;
11898
11899         left = sp->length;
11900         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11901             resv_upfront, 0);
11902         if (sp->data == NULL) {
11903                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11904                 return (ENOMEM);
11905         }
11906         sp->tail_mbuf = m_last(sp->data);
11907         return (0);
11908 }
11909
11910
11911
11912 static struct sctp_stream_queue_pending *
11913 sctp_copy_it_in(struct sctp_tcb *stcb,
11914     struct sctp_association *asoc,
11915     struct sctp_sndrcvinfo *srcv,
11916     struct uio *uio,
11917     struct sctp_nets *net,
11918     int max_send_len,
11919     int user_marks_eor,
11920     int *error,
11921     int non_blocking)
11922 {
11923         /*-
11924          * This routine must be very careful in its work. Protocol
11925          * processing is up and running so care must be taken to spl...()
11926          * when you need to do something that may effect the stcb/asoc. The
11927          * sb is locked however. When data is copied the protocol processing
11928          * should be enabled since this is a slower operation...
11929          */
11930         struct sctp_stream_queue_pending *sp = NULL;
11931         int resv_in_first;
11932
11933         *error = 0;
11934         /* Now can we send this? */
11935         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11936             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11937             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11938             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11939                 /* got data while shutting down */
11940                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11941                 *error = ECONNRESET;
11942                 goto out_now;
11943         }
11944         sctp_alloc_a_strmoq(stcb, sp);
11945         if (sp == NULL) {
11946                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11947                 *error = ENOMEM;
11948                 goto out_now;
11949         }
11950         sp->act_flags = 0;
11951         sp->sender_all_done = 0;
11952         sp->sinfo_flags = srcv->sinfo_flags;
11953         sp->timetolive = srcv->sinfo_timetolive;
11954         sp->ppid = srcv->sinfo_ppid;
11955         sp->context = srcv->sinfo_context;
11956         sp->strseq = 0;
11957         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11958
11959         sp->stream = srcv->sinfo_stream;
11960         sp->length = min(uio->uio_resid, max_send_len);
11961         if ((sp->length == (uint32_t) uio->uio_resid) &&
11962             ((user_marks_eor == 0) ||
11963             (srcv->sinfo_flags & SCTP_EOF) ||
11964             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11965                 sp->msg_is_complete = 1;
11966         } else {
11967                 sp->msg_is_complete = 0;
11968         }
11969         sp->sender_all_done = 0;
11970         sp->some_taken = 0;
11971         sp->put_last_out = 0;
11972         resv_in_first = sizeof(struct sctp_data_chunk);
11973         sp->data = sp->tail_mbuf = NULL;
11974         if (sp->length == 0) {
11975                 *error = 0;
11976                 goto skip_copy;
11977         }
11978         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
11979         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
11980                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
11981                 sp->holds_key_ref = 1;
11982         }
11983         *error = sctp_copy_one(sp, uio, resv_in_first);
11984 skip_copy:
11985         if (*error) {
11986                 sctp_free_a_strmoq(stcb, sp);
11987                 sp = NULL;
11988         } else {
11989                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
11990                         sp->net = net;
11991                         atomic_add_int(&sp->net->ref_count, 1);
11992                 } else {
11993                         sp->net = NULL;
11994                 }
11995                 sctp_set_prsctp_policy(sp);
11996         }
11997 out_now:
11998         return (sp);
11999 }
12000
12001
12002 int
12003 sctp_sosend(struct socket *so,
12004     struct sockaddr *addr,
12005     struct uio *uio,
12006     struct mbuf *top,
12007     struct mbuf *control,
12008     int flags,
12009     struct thread *p
12010 )
12011 {
12012         int error, use_rcvinfo = 0;
12013         struct sctp_sndrcvinfo srcv;
12014         struct sockaddr *addr_to_use;
12015
12016 #if defined(INET) && defined(INET6)
12017         struct sockaddr_in sin;
12018
12019 #endif
12020
12021         if (control) {
12022                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12023                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
12024                     sizeof(srcv))) {
12025                         /* got one */
12026                         use_rcvinfo = 1;
12027                 }
12028         }
12029         addr_to_use = addr;
12030 #if defined(INET) && defined(INET6)
12031         if ((addr) && (addr->sa_family == AF_INET6)) {
12032                 struct sockaddr_in6 *sin6;
12033
12034                 sin6 = (struct sockaddr_in6 *)addr;
12035                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12036                         in6_sin6_2_sin(&sin, sin6);
12037                         addr_to_use = (struct sockaddr *)&sin;
12038                 }
12039         }
12040 #endif
12041         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12042             control,
12043             flags,
12044             use_rcvinfo ? &srcv : NULL
12045             ,p
12046             );
12047         return (error);
12048 }
12049
12050
12051 int
12052 sctp_lower_sosend(struct socket *so,
12053     struct sockaddr *addr,
12054     struct uio *uio,
12055     struct mbuf *i_pak,
12056     struct mbuf *control,
12057     int flags,
12058     struct sctp_sndrcvinfo *srcv
12059     ,
12060     struct thread *p
12061 )
12062 {
12063         unsigned int sndlen = 0, max_len;
12064         int error, len;
12065         struct mbuf *top = NULL;
12066         int queue_only = 0, queue_only_for_init = 0;
12067         int free_cnt_applied = 0;
12068         int un_sent;
12069         int now_filled = 0;
12070         unsigned int inqueue_bytes = 0;
12071         struct sctp_block_entry be;
12072         struct sctp_inpcb *inp;
12073         struct sctp_tcb *stcb = NULL;
12074         struct timeval now;
12075         struct sctp_nets *net;
12076         struct sctp_association *asoc;
12077         struct sctp_inpcb *t_inp;
12078         int user_marks_eor;
12079         int create_lock_applied = 0;
12080         int nagle_applies = 0;
12081         int some_on_control = 0;
12082         int got_all_of_the_send = 0;
12083         int hold_tcblock = 0;
12084         int non_blocking = 0;
12085         uint32_t local_add_more, local_soresv = 0;
12086         uint16_t port;
12087         uint16_t sinfo_flags;
12088         sctp_assoc_t sinfo_assoc_id;
12089
12090         error = 0;
12091         net = NULL;
12092         stcb = NULL;
12093         asoc = NULL;
12094
12095         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12096         if (inp == NULL) {
12097                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12098                 error = EINVAL;
12099                 if (i_pak) {
12100                         SCTP_RELEASE_PKT(i_pak);
12101                 }
12102                 return (error);
12103         }
12104         if ((uio == NULL) && (i_pak == NULL)) {
12105                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12106                 return (EINVAL);
12107         }
12108         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12109         atomic_add_int(&inp->total_sends, 1);
12110         if (uio) {
12111                 if (uio->uio_resid < 0) {
12112                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12113                         return (EINVAL);
12114                 }
12115                 sndlen = uio->uio_resid;
12116         } else {
12117                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12118                 sndlen = SCTP_HEADER_LEN(i_pak);
12119         }
12120         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12121             addr,
12122             sndlen);
12123         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12124             (inp->sctp_socket->so_qlimit)) {
12125                 /* The listener can NOT send */
12126                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12127                 error = ENOTCONN;
12128                 goto out_unlocked;
12129         }
12130         /**
12131          * Pre-screen address, if one is given the sin-len
12132          * must be set correctly!
12133          */
12134         if (addr) {
12135                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12136
12137                 switch (raddr->sa.sa_family) {
12138 #if defined(INET)
12139                 case AF_INET:
12140                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12141                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12142                                 error = EINVAL;
12143                                 goto out_unlocked;
12144                         }
12145                         port = raddr->sin.sin_port;
12146                         break;
12147 #endif
12148 #if defined(INET6)
12149                 case AF_INET6:
12150                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12151                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12152                                 error = EINVAL;
12153                                 goto out_unlocked;
12154                         }
12155                         port = raddr->sin6.sin6_port;
12156                         break;
12157 #endif
12158                 default:
12159                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12160                         error = EAFNOSUPPORT;
12161                         goto out_unlocked;
12162                 }
12163         } else
12164                 port = 0;
12165
12166         if (srcv) {
12167                 sinfo_flags = srcv->sinfo_flags;
12168                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12169                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12170                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12171                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12172                         error = EINVAL;
12173                         goto out_unlocked;
12174                 }
12175                 if (srcv->sinfo_flags)
12176                         SCTP_STAT_INCR(sctps_sends_with_flags);
12177         } else {
12178                 sinfo_flags = inp->def_send.sinfo_flags;
12179                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12180         }
12181         if (sinfo_flags & SCTP_SENDALL) {
12182                 /* its a sendall */
12183                 error = sctp_sendall(inp, uio, top, srcv);
12184                 top = NULL;
12185                 goto out_unlocked;
12186         }
12187         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12188                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12189                 error = EINVAL;
12190                 goto out_unlocked;
12191         }
12192         /* now we must find the assoc */
12193         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12194             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12195                 SCTP_INP_RLOCK(inp);
12196                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12197                 if (stcb == NULL) {
12198                         SCTP_INP_RUNLOCK(inp);
12199                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12200                         error = ENOTCONN;
12201                         goto out_unlocked;
12202                 }
12203                 SCTP_TCB_LOCK(stcb);
12204                 hold_tcblock = 1;
12205                 SCTP_INP_RUNLOCK(inp);
12206         } else if (sinfo_assoc_id) {
12207                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12208         } else if (addr) {
12209                 /*-
12210                  * Since we did not use findep we must
12211                  * increment it, and if we don't find a tcb
12212                  * decrement it.
12213                  */
12214                 SCTP_INP_WLOCK(inp);
12215                 SCTP_INP_INCR_REF(inp);
12216                 SCTP_INP_WUNLOCK(inp);
12217                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12218                 if (stcb == NULL) {
12219                         SCTP_INP_WLOCK(inp);
12220                         SCTP_INP_DECR_REF(inp);
12221                         SCTP_INP_WUNLOCK(inp);
12222                 } else {
12223                         hold_tcblock = 1;
12224                 }
12225         }
12226         if ((stcb == NULL) && (addr)) {
12227                 /* Possible implicit send? */
12228                 SCTP_ASOC_CREATE_LOCK(inp);
12229                 create_lock_applied = 1;
12230                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12231                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12232                         /* Should I really unlock ? */
12233                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12234                         error = EINVAL;
12235                         goto out_unlocked;
12236
12237                 }
12238                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12239                     (addr->sa_family == AF_INET6)) {
12240                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12241                         error = EINVAL;
12242                         goto out_unlocked;
12243                 }
12244                 SCTP_INP_WLOCK(inp);
12245                 SCTP_INP_INCR_REF(inp);
12246                 SCTP_INP_WUNLOCK(inp);
12247                 /* With the lock applied look again */
12248                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12249                 if (stcb == NULL) {
12250                         SCTP_INP_WLOCK(inp);
12251                         SCTP_INP_DECR_REF(inp);
12252                         SCTP_INP_WUNLOCK(inp);
12253                 } else {
12254                         hold_tcblock = 1;
12255                 }
12256                 if (t_inp != inp) {
12257                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12258                         error = ENOTCONN;
12259                         goto out_unlocked;
12260                 }
12261         }
12262         if (stcb == NULL) {
12263                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
12264                     (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12265                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12266                         error = ENOTCONN;
12267                         goto out_unlocked;
12268                 }
12269                 if (addr == NULL) {
12270                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12271                         error = ENOENT;
12272                         goto out_unlocked;
12273                 } else {
12274                         /*
12275                          * UDP style, we must go ahead and start the INIT
12276                          * process
12277                          */
12278                         uint32_t vrf_id;
12279
12280                         if ((sinfo_flags & SCTP_ABORT) ||
12281                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12282                                 /*-
12283                                  * User asks to abort a non-existant assoc,
12284                                  * or EOF a non-existant assoc with no data
12285                                  */
12286                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12287                                 error = ENOENT;
12288                                 goto out_unlocked;
12289                         }
12290                         /* get an asoc/stcb struct */
12291                         vrf_id = inp->def_vrf_id;
12292 #ifdef INVARIANTS
12293                         if (create_lock_applied == 0) {
12294                                 panic("Error, should hold create lock and I don't?");
12295                         }
12296 #endif
12297                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12298                             p
12299                             );
12300                         if (stcb == NULL) {
12301                                 /* Error is setup for us in the call */
12302                                 goto out_unlocked;
12303                         }
12304                         if (create_lock_applied) {
12305                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12306                                 create_lock_applied = 0;
12307                         } else {
12308                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12309                         }
12310                         /*
12311                          * Turn on queue only flag to prevent data from
12312                          * being sent
12313                          */
12314                         queue_only = 1;
12315                         asoc = &stcb->asoc;
12316                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12317                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12318
12319                         /* initialize authentication params for the assoc */
12320                         sctp_initialize_auth_params(inp, stcb);
12321
12322                         if (control) {
12323                                 /*
12324                                  * see if a init structure exists in cmsg
12325                                  * headers
12326                                  */
12327                                 struct sctp_initmsg initm;
12328                                 int i;
12329
12330                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
12331                                     sizeof(initm))) {
12332                                         /*
12333                                          * we have an INIT override of the
12334                                          * default
12335                                          */
12336                                         if (initm.sinit_max_attempts)
12337                                                 asoc->max_init_times = initm.sinit_max_attempts;
12338                                         if (initm.sinit_num_ostreams)
12339                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
12340                                         if (initm.sinit_max_instreams)
12341                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
12342                                         if (initm.sinit_max_init_timeo)
12343                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
12344                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
12345                                                 struct sctp_stream_out *tmp_str;
12346                                                 int had_lock = 0;
12347
12348                                                 /* Default is NOT correct */
12349                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
12350                                                     asoc->streamoutcnt, asoc->pre_open_streams);
12351                                                 /*
12352                                                  * What happens if this
12353                                                  * fails? we panic ...
12354                                                  */
12355
12356                                                 if (hold_tcblock) {
12357                                                         had_lock = 1;
12358                                                         SCTP_TCB_UNLOCK(stcb);
12359                                                 }
12360                                                 SCTP_MALLOC(tmp_str,
12361                                                     struct sctp_stream_out *,
12362                                                     (asoc->pre_open_streams *
12363                                                     sizeof(struct sctp_stream_out)),
12364                                                     SCTP_M_STRMO);
12365                                                 if (had_lock) {
12366                                                         SCTP_TCB_LOCK(stcb);
12367                                                 }
12368                                                 if (tmp_str != NULL) {
12369                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
12370                                                         asoc->strmout = tmp_str;
12371                                                         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
12372                                                 } else {
12373                                                         asoc->pre_open_streams = asoc->streamoutcnt;
12374                                                 }
12375                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
12376                                                         /*-
12377                                                          * inbound side must be set
12378                                                          * to 0xffff, also NOTE when
12379                                                          * we get the INIT-ACK back
12380                                                          * (for INIT sender) we MUST
12381                                                          * reduce the count
12382                                                          * (streamoutcnt) but first
12383                                                          * check if we sent to any
12384                                                          * of the upper streams that
12385                                                          * were dropped (if some
12386                                                          * were). Those that were
12387                                                          * dropped must be notified
12388                                                          * to the upper layer as
12389                                                          * failed to send.
12390                                                          */
12391                                                         asoc->strmout[i].next_sequence_sent = 0x0;
12392                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
12393                                                         asoc->strmout[i].stream_no = i;
12394                                                         asoc->strmout[i].last_msg_incomplete = 0;
12395                                                         asoc->ss_functions.sctp_ss_init_stream(&asoc->strmout[i], NULL);
12396                                                 }
12397                                         }
12398                                 }
12399                         }
12400                         hold_tcblock = 1;
12401                         /* out with the INIT */
12402                         queue_only_for_init = 1;
12403                         /*-
12404                          * we may want to dig in after this call and adjust the MTU
12405                          * value. It defaulted to 1500 (constant) but the ro
12406                          * structure may now have an update and thus we may need to
12407                          * change it BEFORE we append the message.
12408                          */
12409                 }
12410         } else
12411                 asoc = &stcb->asoc;
12412         if (srcv == NULL)
12413                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12414         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12415                 if (addr)
12416                         net = sctp_findnet(stcb, addr);
12417                 else
12418                         net = NULL;
12419                 if ((net == NULL) ||
12420                     ((port != 0) && (port != stcb->rport))) {
12421                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12422                         error = EINVAL;
12423                         goto out_unlocked;
12424                 }
12425         } else {
12426                 net = stcb->asoc.primary_destination;
12427         }
12428         atomic_add_int(&stcb->total_sends, 1);
12429         /* Keep the stcb from being freed under our feet */
12430         atomic_add_int(&asoc->refcnt, 1);
12431         free_cnt_applied = 1;
12432
12433         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12434                 if (sndlen > asoc->smallest_mtu) {
12435                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12436                         error = EMSGSIZE;
12437                         goto out_unlocked;
12438                 }
12439         }
12440         if ((SCTP_SO_IS_NBIO(so)
12441             || (flags & MSG_NBIO)
12442             )) {
12443                 non_blocking = 1;
12444         }
12445         /* would we block? */
12446         if (non_blocking) {
12447                 if (hold_tcblock == 0) {
12448                         SCTP_TCB_LOCK(stcb);
12449                         hold_tcblock = 1;
12450                 }
12451                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12452                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12453                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12454                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12455                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12456                                 error = EMSGSIZE;
12457                         else
12458                                 error = EWOULDBLOCK;
12459                         goto out_unlocked;
12460                 }
12461                 stcb->asoc.sb_send_resv += sndlen;
12462                 SCTP_TCB_UNLOCK(stcb);
12463                 hold_tcblock = 0;
12464         } else {
12465                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12466         }
12467         local_soresv = sndlen;
12468         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12469                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12470                 error = ECONNRESET;
12471                 goto out_unlocked;
12472         }
12473         if (create_lock_applied) {
12474                 SCTP_ASOC_CREATE_UNLOCK(inp);
12475                 create_lock_applied = 0;
12476         }
12477         if (asoc->stream_reset_outstanding) {
12478                 /*
12479                  * Can't queue any data while stream reset is underway.
12480                  */
12481                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12482                 error = EAGAIN;
12483                 goto out_unlocked;
12484         }
12485         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12486             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12487                 queue_only = 1;
12488         }
12489         /* we are now done with all control */
12490         if (control) {
12491                 sctp_m_freem(control);
12492                 control = NULL;
12493         }
12494         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12495             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12496             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12497             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12498                 if (srcv->sinfo_flags & SCTP_ABORT) {
12499                         ;
12500                 } else {
12501                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12502                         error = ECONNRESET;
12503                         goto out_unlocked;
12504                 }
12505         }
12506         /* Ok, we will attempt a msgsnd :> */
12507         if (p) {
12508                 p->td_ru.ru_msgsnd++;
12509         }
12510         /* Are we aborting? */
12511         if (srcv->sinfo_flags & SCTP_ABORT) {
12512                 struct mbuf *mm;
12513                 int tot_demand, tot_out = 0, max_out;
12514
12515                 SCTP_STAT_INCR(sctps_sends_with_abort);
12516                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12517                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12518                         /* It has to be up before we abort */
12519                         /* how big is the user initiated abort? */
12520                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12521                         error = EINVAL;
12522                         goto out;
12523                 }
12524                 if (hold_tcblock) {
12525                         SCTP_TCB_UNLOCK(stcb);
12526                         hold_tcblock = 0;
12527                 }
12528                 if (top) {
12529                         struct mbuf *cntm = NULL;
12530
12531                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12532                         if (sndlen != 0) {
12533                                 cntm = top;
12534                                 while (cntm) {
12535                                         tot_out += SCTP_BUF_LEN(cntm);
12536                                         cntm = SCTP_BUF_NEXT(cntm);
12537                                 }
12538                         }
12539                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12540                 } else {
12541                         /* Must fit in a MTU */
12542                         tot_out = sndlen;
12543                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12544                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12545                                 /* To big */
12546                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12547                                 error = EMSGSIZE;
12548                                 goto out;
12549                         }
12550                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12551                 }
12552                 if (mm == NULL) {
12553                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12554                         error = ENOMEM;
12555                         goto out;
12556                 }
12557                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12558                 max_out -= sizeof(struct sctp_abort_msg);
12559                 if (tot_out > max_out) {
12560                         tot_out = max_out;
12561                 }
12562                 if (mm) {
12563                         struct sctp_paramhdr *ph;
12564
12565                         /* now move forward the data pointer */
12566                         ph = mtod(mm, struct sctp_paramhdr *);
12567                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12568                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12569                         ph++;
12570                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12571                         if (top == NULL) {
12572                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12573                                 if (error) {
12574                                         /*-
12575                                          * Here if we can't get his data we
12576                                          * still abort we just don't get to
12577                                          * send the users note :-0
12578                                          */
12579                                         sctp_m_freem(mm);
12580                                         mm = NULL;
12581                                 }
12582                         } else {
12583                                 if (sndlen != 0) {
12584                                         SCTP_BUF_NEXT(mm) = top;
12585                                 }
12586                         }
12587                 }
12588                 if (hold_tcblock == 0) {
12589                         SCTP_TCB_LOCK(stcb);
12590                         hold_tcblock = 1;
12591                 }
12592                 atomic_add_int(&stcb->asoc.refcnt, -1);
12593                 free_cnt_applied = 0;
12594                 /* release this lock, otherwise we hang on ourselves */
12595                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12596                     SCTP_RESPONSE_TO_USER_REQ,
12597                     mm, SCTP_SO_LOCKED);
12598                 /* now relock the stcb so everything is sane */
12599                 hold_tcblock = 0;
12600                 stcb = NULL;
12601                 /*
12602                  * In this case top is already chained to mm avoid double
12603                  * free, since we free it below if top != NULL and driver
12604                  * would free it after sending the packet out
12605                  */
12606                 if (sndlen != 0) {
12607                         top = NULL;
12608                 }
12609                 goto out_unlocked;
12610         }
12611         /* Calculate the maximum we can send */
12612         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12613         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12614                 if (non_blocking) {
12615                         /* we already checked for non-blocking above. */
12616                         max_len = sndlen;
12617                 } else {
12618                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12619                 }
12620         } else {
12621                 max_len = 0;
12622         }
12623         if (hold_tcblock) {
12624                 SCTP_TCB_UNLOCK(stcb);
12625                 hold_tcblock = 0;
12626         }
12627         /* Is the stream no. valid? */
12628         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12629                 /* Invalid stream number */
12630                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12631                 error = EINVAL;
12632                 goto out_unlocked;
12633         }
12634         if (asoc->strmout == NULL) {
12635                 /* huh? software error */
12636                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12637                 error = EFAULT;
12638                 goto out_unlocked;
12639         }
12640         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12641         if ((user_marks_eor == 0) &&
12642             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12643                 /* It will NEVER fit */
12644                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12645                 error = EMSGSIZE;
12646                 goto out_unlocked;
12647         }
12648         if ((uio == NULL) && user_marks_eor) {
12649                 /*-
12650                  * We do not support eeor mode for
12651                  * sending with mbuf chains (like sendfile).
12652                  */
12653                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12654                 error = EINVAL;
12655                 goto out_unlocked;
12656         }
12657         if (user_marks_eor) {
12658                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12659         } else {
12660                 /*-
12661                  * For non-eeor the whole message must fit in
12662                  * the socket send buffer.
12663                  */
12664                 local_add_more = sndlen;
12665         }
12666         len = 0;
12667         if (non_blocking) {
12668                 goto skip_preblock;
12669         }
12670         if (((max_len <= local_add_more) &&
12671             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12672             (max_len == 0) ||
12673             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12674                 /* No room right now ! */
12675                 SOCKBUF_LOCK(&so->so_snd);
12676                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12677                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12678                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12679                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12680                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12681                             inqueue_bytes,
12682                             local_add_more,
12683                             stcb->asoc.stream_queue_cnt,
12684                             stcb->asoc.chunks_on_out_queue,
12685                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12686                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12687                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
12688                         }
12689                         be.error = 0;
12690                         stcb->block_entry = &be;
12691                         error = sbwait(&so->so_snd);
12692                         stcb->block_entry = NULL;
12693                         if (error || so->so_error || be.error) {
12694                                 if (error == 0) {
12695                                         if (so->so_error)
12696                                                 error = so->so_error;
12697                                         if (be.error) {
12698                                                 error = be.error;
12699                                         }
12700                                 }
12701                                 SOCKBUF_UNLOCK(&so->so_snd);
12702                                 goto out_unlocked;
12703                         }
12704                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12705                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12706                                     so, asoc, stcb->asoc.total_output_queue_size);
12707                         }
12708                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12709                                 goto out_unlocked;
12710                         }
12711                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12712                 }
12713                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12714                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12715                 } else {
12716                         max_len = 0;
12717                 }
12718                 SOCKBUF_UNLOCK(&so->so_snd);
12719         }
12720 skip_preblock:
12721         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12722                 goto out_unlocked;
12723         }
12724         /*
12725          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12726          * case NOTE: uio will be null when top/mbuf is passed
12727          */
12728         if (sndlen == 0) {
12729                 if (srcv->sinfo_flags & SCTP_EOF) {
12730                         got_all_of_the_send = 1;
12731                         goto dataless_eof;
12732                 } else {
12733                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12734                         error = EINVAL;
12735                         goto out;
12736                 }
12737         }
12738         if (top == NULL) {
12739                 struct sctp_stream_queue_pending *sp;
12740                 struct sctp_stream_out *strm;
12741                 uint32_t sndout;
12742
12743                 SCTP_TCB_SEND_LOCK(stcb);
12744                 if ((asoc->stream_locked) &&
12745                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12746                         SCTP_TCB_SEND_UNLOCK(stcb);
12747                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12748                         error = EINVAL;
12749                         goto out;
12750                 }
12751                 SCTP_TCB_SEND_UNLOCK(stcb);
12752
12753                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12754                 if (strm->last_msg_incomplete == 0) {
12755         do_a_copy_in:
12756                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
12757                         if ((sp == NULL) || (error)) {
12758                                 goto out;
12759                         }
12760                         SCTP_TCB_SEND_LOCK(stcb);
12761                         if (sp->msg_is_complete) {
12762                                 strm->last_msg_incomplete = 0;
12763                                 asoc->stream_locked = 0;
12764                         } else {
12765                                 /*
12766                                  * Just got locked to this guy in case of an
12767                                  * interrupt.
12768                                  */
12769                                 strm->last_msg_incomplete = 1;
12770                                 asoc->stream_locked = 1;
12771                                 asoc->stream_locked_on = srcv->sinfo_stream;
12772                                 sp->sender_all_done = 0;
12773                         }
12774                         sctp_snd_sb_alloc(stcb, sp->length);
12775                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12776                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12777                                 sp->strseq = strm->next_sequence_sent;
12778                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12779                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12780                                             (uintptr_t) stcb, sp->length,
12781                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12782                                 }
12783                                 strm->next_sequence_sent++;
12784                         } else {
12785                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12786                         }
12787                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12788                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12789                         SCTP_TCB_SEND_UNLOCK(stcb);
12790                 } else {
12791                         SCTP_TCB_SEND_LOCK(stcb);
12792                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12793                         SCTP_TCB_SEND_UNLOCK(stcb);
12794                         if (sp == NULL) {
12795                                 /* ???? Huh ??? last msg is gone */
12796 #ifdef INVARIANTS
12797                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12798 #else
12799                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12800                                 strm->last_msg_incomplete = 0;
12801 #endif
12802                                 goto do_a_copy_in;
12803
12804                         }
12805                 }
12806                 while (uio->uio_resid > 0) {
12807                         /* How much room do we have? */
12808                         struct mbuf *new_tail, *mm;
12809
12810                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12811                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12812                         else
12813                                 max_len = 0;
12814
12815                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12816                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12817                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12818                                 sndout = 0;
12819                                 new_tail = NULL;
12820                                 if (hold_tcblock) {
12821                                         SCTP_TCB_UNLOCK(stcb);
12822                                         hold_tcblock = 0;
12823                                 }
12824                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
12825                                 if ((mm == NULL) || error) {
12826                                         if (mm) {
12827                                                 sctp_m_freem(mm);
12828                                         }
12829                                         goto out;
12830                                 }
12831                                 /* Update the mbuf and count */
12832                                 SCTP_TCB_SEND_LOCK(stcb);
12833                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12834                                         /*
12835                                          * we need to get out. Peer probably
12836                                          * aborted.
12837                                          */
12838                                         sctp_m_freem(mm);
12839                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12840                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12841                                                 error = ECONNRESET;
12842                                         }
12843                                         SCTP_TCB_SEND_UNLOCK(stcb);
12844                                         goto out;
12845                                 }
12846                                 if (sp->tail_mbuf) {
12847                                         /* tack it to the end */
12848                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12849                                         sp->tail_mbuf = new_tail;
12850                                 } else {
12851                                         /* A stolen mbuf */
12852                                         sp->data = mm;
12853                                         sp->tail_mbuf = new_tail;
12854                                 }
12855                                 sctp_snd_sb_alloc(stcb, sndout);
12856                                 atomic_add_int(&sp->length, sndout);
12857                                 len += sndout;
12858
12859                                 /* Did we reach EOR? */
12860                                 if ((uio->uio_resid == 0) &&
12861                                     ((user_marks_eor == 0) ||
12862                                     (srcv->sinfo_flags & SCTP_EOF) ||
12863                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12864                                         sp->msg_is_complete = 1;
12865                                 } else {
12866                                         sp->msg_is_complete = 0;
12867                                 }
12868                                 SCTP_TCB_SEND_UNLOCK(stcb);
12869                         }
12870                         if (uio->uio_resid == 0) {
12871                                 /* got it all? */
12872                                 continue;
12873                         }
12874                         /* PR-SCTP? */
12875                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12876                                 /*
12877                                  * This is ugly but we must assure locking
12878                                  * order
12879                                  */
12880                                 if (hold_tcblock == 0) {
12881                                         SCTP_TCB_LOCK(stcb);
12882                                         hold_tcblock = 1;
12883                                 }
12884                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12885                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12886                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12887                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12888                                 else
12889                                         max_len = 0;
12890                                 if (max_len > 0) {
12891                                         continue;
12892                                 }
12893                                 SCTP_TCB_UNLOCK(stcb);
12894                                 hold_tcblock = 0;
12895                         }
12896                         /* wait for space now */
12897                         if (non_blocking) {
12898                                 /* Non-blocking io in place out */
12899                                 goto skip_out_eof;
12900                         }
12901                         /* What about the INIT, send it maybe */
12902                         if (queue_only_for_init) {
12903                                 if (hold_tcblock == 0) {
12904                                         SCTP_TCB_LOCK(stcb);
12905                                         hold_tcblock = 1;
12906                                 }
12907                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12908                                         /* a collision took us forward? */
12909                                         queue_only = 0;
12910                                 } else {
12911                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12912                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12913                                         queue_only = 1;
12914                                 }
12915                         }
12916                         if ((net->flight_size > net->cwnd) &&
12917                             (asoc->sctp_cmt_on_off == 0)) {
12918                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12919                                 queue_only = 1;
12920                         } else if (asoc->ifp_had_enobuf) {
12921                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12922                                 if (net->flight_size > (2 * net->mtu)) {
12923                                         queue_only = 1;
12924                                 }
12925                                 asoc->ifp_had_enobuf = 0;
12926                         }
12927                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12928                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12929                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12930                             (stcb->asoc.total_flight > 0) &&
12931                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12932                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12933
12934                                 /*-
12935                                  * Ok, Nagle is set on and we have data outstanding.
12936                                  * Don't send anything and let SACKs drive out the
12937                                  * data unless wen have a "full" segment to send.
12938                                  */
12939                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12940                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12941                                 }
12942                                 SCTP_STAT_INCR(sctps_naglequeued);
12943                                 nagle_applies = 1;
12944                         } else {
12945                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12946                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12947                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12948                                 }
12949                                 SCTP_STAT_INCR(sctps_naglesent);
12950                                 nagle_applies = 0;
12951                         }
12952                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12953
12954                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12955                                     nagle_applies, un_sent);
12956                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12957                                     stcb->asoc.total_flight,
12958                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12959                         }
12960                         if (queue_only_for_init)
12961                                 queue_only_for_init = 0;
12962                         if ((queue_only == 0) && (nagle_applies == 0)) {
12963                                 /*-
12964                                  * need to start chunk output
12965                                  * before blocking.. note that if
12966                                  * a lock is already applied, then
12967                                  * the input via the net is happening
12968                                  * and I don't need to start output :-D
12969                                  */
12970                                 if (hold_tcblock == 0) {
12971                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12972                                                 hold_tcblock = 1;
12973                                                 sctp_chunk_output(inp,
12974                                                     stcb,
12975                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12976                                         }
12977                                 } else {
12978                                         sctp_chunk_output(inp,
12979                                             stcb,
12980                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12981                                 }
12982                                 if (hold_tcblock == 1) {
12983                                         SCTP_TCB_UNLOCK(stcb);
12984                                         hold_tcblock = 0;
12985                                 }
12986                         }
12987                         SOCKBUF_LOCK(&so->so_snd);
12988                         /*-
12989                          * This is a bit strange, but I think it will
12990                          * work. The total_output_queue_size is locked and
12991                          * protected by the TCB_LOCK, which we just released.
12992                          * There is a race that can occur between releasing it
12993                          * above, and me getting the socket lock, where sacks
12994                          * come in but we have not put the SB_WAIT on the
12995                          * so_snd buffer to get the wakeup. After the LOCK
12996                          * is applied the sack_processing will also need to
12997                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12998                          * once we have the socket buffer lock if we recheck the
12999                          * size we KNOW we will get to sleep safely with the
13000                          * wakeup flag in place.
13001                          */
13002                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13003                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13004                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13005                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13006                                             so, asoc, uio->uio_resid);
13007                                 }
13008                                 be.error = 0;
13009                                 stcb->block_entry = &be;
13010                                 error = sbwait(&so->so_snd);
13011                                 stcb->block_entry = NULL;
13012
13013                                 if (error || so->so_error || be.error) {
13014                                         if (error == 0) {
13015                                                 if (so->so_error)
13016                                                         error = so->so_error;
13017                                                 if (be.error) {
13018                                                         error = be.error;
13019                                                 }
13020                                         }
13021                                         SOCKBUF_UNLOCK(&so->so_snd);
13022                                         goto out_unlocked;
13023                                 }
13024                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13025                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13026                                             so, asoc, stcb->asoc.total_output_queue_size);
13027                                 }
13028                         }
13029                         SOCKBUF_UNLOCK(&so->so_snd);
13030                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13031                                 goto out_unlocked;
13032                         }
13033                 }
13034                 SCTP_TCB_SEND_LOCK(stcb);
13035                 if (sp) {
13036                         if (sp->msg_is_complete == 0) {
13037                                 strm->last_msg_incomplete = 1;
13038                                 asoc->stream_locked = 1;
13039                                 asoc->stream_locked_on = srcv->sinfo_stream;
13040                         } else {
13041                                 sp->sender_all_done = 1;
13042                                 strm->last_msg_incomplete = 0;
13043                                 asoc->stream_locked = 0;
13044                         }
13045                 } else {
13046                         SCTP_PRINTF("Huh no sp TSNH?\n");
13047                         strm->last_msg_incomplete = 0;
13048                         asoc->stream_locked = 0;
13049                 }
13050                 SCTP_TCB_SEND_UNLOCK(stcb);
13051                 if (uio->uio_resid == 0) {
13052                         got_all_of_the_send = 1;
13053                 }
13054         } else {
13055                 /* We send in a 0, since we do NOT have any locks */
13056                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13057                 top = NULL;
13058                 if (srcv->sinfo_flags & SCTP_EOF) {
13059                         /*
13060                          * This should only happen for Panda for the mbuf
13061                          * send case, which does NOT yet support EEOR mode.
13062                          * Thus, we can just set this flag to do the proper
13063                          * EOF handling.
13064                          */
13065                         got_all_of_the_send = 1;
13066                 }
13067         }
13068         if (error) {
13069                 goto out;
13070         }
13071 dataless_eof:
13072         /* EOF thing ? */
13073         if ((srcv->sinfo_flags & SCTP_EOF) &&
13074             (got_all_of_the_send == 1) &&
13075             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13076                 int cnt;
13077
13078                 SCTP_STAT_INCR(sctps_sends_with_eof);
13079                 error = 0;
13080                 if (hold_tcblock == 0) {
13081                         SCTP_TCB_LOCK(stcb);
13082                         hold_tcblock = 1;
13083                 }
13084                 cnt = sctp_is_there_unsent_data(stcb);
13085                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13086                     TAILQ_EMPTY(&asoc->sent_queue) &&
13087                     (cnt == 0)) {
13088                         if (asoc->locked_on_sending) {
13089                                 goto abort_anyway;
13090                         }
13091                         /* there is nothing queued to send, so I'm done... */
13092                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13093                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13094                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13095                                 /* only send SHUTDOWN the first time through */
13096                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
13097                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13098                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13099                                 }
13100                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13101                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13102                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13103                                     asoc->primary_destination);
13104                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13105                                     asoc->primary_destination);
13106                         }
13107                 } else {
13108                         /*-
13109                          * we still got (or just got) data to send, so set
13110                          * SHUTDOWN_PENDING
13111                          */
13112                         /*-
13113                          * XXX sockets draft says that SCTP_EOF should be
13114                          * sent with no data.  currently, we will allow user
13115                          * data to be sent first and move to
13116                          * SHUTDOWN-PENDING
13117                          */
13118                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13119                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13120                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13121                                 if (hold_tcblock == 0) {
13122                                         SCTP_TCB_LOCK(stcb);
13123                                         hold_tcblock = 1;
13124                                 }
13125                                 if (asoc->locked_on_sending) {
13126                                         /* Locked to send out the data */
13127                                         struct sctp_stream_queue_pending *sp;
13128
13129                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13130                                         if (sp) {
13131                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13132                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13133                                         }
13134                                 }
13135                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13136                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13137                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13138                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13139                         abort_anyway:
13140                                         if (free_cnt_applied) {
13141                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13142                                                 free_cnt_applied = 0;
13143                                         }
13144                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13145                                             SCTP_RESPONSE_TO_USER_REQ,
13146                                             NULL, SCTP_SO_LOCKED);
13147                                         /*
13148                                          * now relock the stcb so everything
13149                                          * is sane
13150                                          */
13151                                         hold_tcblock = 0;
13152                                         stcb = NULL;
13153                                         goto out;
13154                                 }
13155                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13156                                     asoc->primary_destination);
13157                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13158                         }
13159                 }
13160         }
13161 skip_out_eof:
13162         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13163                 some_on_control = 1;
13164         }
13165         if (queue_only_for_init) {
13166                 if (hold_tcblock == 0) {
13167                         SCTP_TCB_LOCK(stcb);
13168                         hold_tcblock = 1;
13169                 }
13170                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13171                         /* a collision took us forward? */
13172                         queue_only = 0;
13173                 } else {
13174                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13175                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13176                         queue_only = 1;
13177                 }
13178         }
13179         if ((net->flight_size > net->cwnd) &&
13180             (stcb->asoc.sctp_cmt_on_off == 0)) {
13181                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13182                 queue_only = 1;
13183         } else if (asoc->ifp_had_enobuf) {
13184                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13185                 if (net->flight_size > (2 * net->mtu)) {
13186                         queue_only = 1;
13187                 }
13188                 asoc->ifp_had_enobuf = 0;
13189         }
13190         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13191             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13192         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13193             (stcb->asoc.total_flight > 0) &&
13194             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13195             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13196                 /*-
13197                  * Ok, Nagle is set on and we have data outstanding.
13198                  * Don't send anything and let SACKs drive out the
13199                  * data unless wen have a "full" segment to send.
13200                  */
13201                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13202                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13203                 }
13204                 SCTP_STAT_INCR(sctps_naglequeued);
13205                 nagle_applies = 1;
13206         } else {
13207                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13208                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13209                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13210                 }
13211                 SCTP_STAT_INCR(sctps_naglesent);
13212                 nagle_applies = 0;
13213         }
13214         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13215                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13216                     nagle_applies, un_sent);
13217                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13218                     stcb->asoc.total_flight,
13219                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13220         }
13221         if (queue_only_for_init)
13222                 queue_only_for_init = 0;
13223         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13224                 /* we can attempt to send too. */
13225                 if (hold_tcblock == 0) {
13226                         /*
13227                          * If there is activity recv'ing sacks no need to
13228                          * send
13229                          */
13230                         if (SCTP_TCB_TRYLOCK(stcb)) {
13231                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13232                                 hold_tcblock = 1;
13233                         }
13234                 } else {
13235                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13236                 }
13237         } else if ((queue_only == 0) &&
13238                     (stcb->asoc.peers_rwnd == 0) &&
13239             (stcb->asoc.total_flight == 0)) {
13240                 /* We get to have a probe outstanding */
13241                 if (hold_tcblock == 0) {
13242                         hold_tcblock = 1;
13243                         SCTP_TCB_LOCK(stcb);
13244                 }
13245                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13246         } else if (some_on_control) {
13247                 int num_out, reason, frag_point;
13248
13249                 /* Here we do control only */
13250                 if (hold_tcblock == 0) {
13251                         hold_tcblock = 1;
13252                         SCTP_TCB_LOCK(stcb);
13253                 }
13254                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13255                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13256                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13257         }
13258         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13259             queue_only, stcb->asoc.peers_rwnd, un_sent,
13260             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13261             stcb->asoc.total_output_queue_size, error);
13262
13263 out:
13264 out_unlocked:
13265
13266         if (local_soresv && stcb) {
13267                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13268                 local_soresv = 0;
13269         }
13270         if (create_lock_applied) {
13271                 SCTP_ASOC_CREATE_UNLOCK(inp);
13272                 create_lock_applied = 0;
13273         }
13274         if ((stcb) && hold_tcblock) {
13275                 SCTP_TCB_UNLOCK(stcb);
13276         }
13277         if (stcb && free_cnt_applied) {
13278                 atomic_add_int(&stcb->asoc.refcnt, -1);
13279         }
13280 #ifdef INVARIANTS
13281         if (stcb) {
13282                 if (mtx_owned(&stcb->tcb_mtx)) {
13283                         panic("Leaving with tcb mtx owned?");
13284                 }
13285                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13286                         panic("Leaving with tcb send mtx owned?");
13287                 }
13288         }
13289 #endif
13290 #ifdef INVARIANTS
13291         if (inp) {
13292                 sctp_validate_no_locks(inp);
13293         } else {
13294                 printf("Warning - inp is NULL so cant validate locks\n");
13295         }
13296 #endif
13297         if (top) {
13298                 sctp_m_freem(top);
13299         }
13300         if (control) {
13301                 sctp_m_freem(control);
13302         }
13303         return (error);
13304 }
13305
13306
13307 /*
13308  * generate an AUTHentication chunk, if required
13309  */
13310 struct mbuf *
13311 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13312     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13313     struct sctp_tcb *stcb, uint8_t chunk)
13314 {
13315         struct mbuf *m_auth;
13316         struct sctp_auth_chunk *auth;
13317         int chunk_len;
13318
13319         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13320             (stcb == NULL))
13321                 return (m);
13322
13323         /* sysctl disabled auth? */
13324         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13325                 return (m);
13326
13327         /* peer doesn't do auth... */
13328         if (!stcb->asoc.peer_supports_auth) {
13329                 return (m);
13330         }
13331         /* does the requested chunk require auth? */
13332         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13333                 return (m);
13334         }
13335         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13336         if (m_auth == NULL) {
13337                 /* no mbuf's */
13338                 return (m);
13339         }
13340         /* reserve some space if this will be the first mbuf */
13341         if (m == NULL)
13342                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13343         /* fill in the AUTH chunk details */
13344         auth = mtod(m_auth, struct sctp_auth_chunk *);
13345         bzero(auth, sizeof(*auth));
13346         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13347         auth->ch.chunk_flags = 0;
13348         chunk_len = sizeof(*auth) +
13349             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13350         auth->ch.chunk_length = htons(chunk_len);
13351         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13352         /* key id and hmac digest will be computed and filled in upon send */
13353
13354         /* save the offset where the auth was inserted into the chain */
13355         if (m != NULL) {
13356                 struct mbuf *cn;
13357
13358                 *offset = 0;
13359                 cn = m;
13360                 while (cn) {
13361                         *offset += SCTP_BUF_LEN(cn);
13362                         cn = SCTP_BUF_NEXT(cn);
13363                 }
13364         } else
13365                 *offset = 0;
13366
13367         /* update length and return pointer to the auth chunk */
13368         SCTP_BUF_LEN(m_auth) = chunk_len;
13369         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13370         if (auth_ret != NULL)
13371                 *auth_ret = auth;
13372
13373         return (m);
13374 }
13375
13376 #ifdef INET6
13377 int
13378 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13379 {
13380         struct nd_prefix *pfx = NULL;
13381         struct nd_pfxrouter *pfxrtr = NULL;
13382         struct sockaddr_in6 gw6;
13383
13384         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13385                 return (0);
13386
13387         /* get prefix entry of address */
13388         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13389                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13390                         continue;
13391                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13392                     &src6->sin6_addr, &pfx->ndpr_mask))
13393                         break;
13394         }
13395         /* no prefix entry in the prefix list */
13396         if (pfx == NULL) {
13397                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13398                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13399                 return (0);
13400         }
13401         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13402         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13403
13404         /* search installed gateway from prefix entry */
13405         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13406             pfxrtr->pfr_next) {
13407                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13408                 gw6.sin6_family = AF_INET6;
13409                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13410                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13411                     sizeof(struct in6_addr));
13412                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13413                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13414                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13415                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13416                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13417                     ro->ro_rt->rt_gateway)) {
13418                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13419                         return (1);
13420                 }
13421         }
13422         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13423         return (0);
13424 }
13425
13426 #endif
13427
13428 int
13429 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13430 {
13431         struct sockaddr_in *sin, *mask;
13432         struct ifaddr *ifa;
13433         struct in_addr srcnetaddr, gwnetaddr;
13434
13435         if (ro == NULL || ro->ro_rt == NULL ||
13436             sifa->address.sa.sa_family != AF_INET) {
13437                 return (0);
13438         }
13439         ifa = (struct ifaddr *)sifa->ifa;
13440         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13441         sin = (struct sockaddr_in *)&sifa->address.sin;
13442         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13443         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13444         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13445         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13446
13447         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13448         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13449         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13450         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13451         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13452         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13453                 return (1);
13454         }
13455         return (0);
13456 }