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 #ifdef INET
1884         case AF_INET:
1885                 if (ipv4_addr_legal) {
1886                         struct sockaddr_in *sin;
1887
1888                         sin = (struct sockaddr_in *)&ifa->address.sin;
1889                         if (sin->sin_addr.s_addr == 0) {
1890                                 /* not in scope , unspecified */
1891                                 return (0);
1892                         }
1893                         if ((ipv4_local_scope == 0) &&
1894                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1895                                 /* private address not in scope */
1896                                 return (0);
1897                         }
1898                 } else {
1899                         return (0);
1900                 }
1901                 break;
1902 #endif
1903 #ifdef INET6
1904         case AF_INET6:
1905                 if (ipv6_addr_legal) {
1906                         struct sockaddr_in6 *sin6;
1907
1908                         /*
1909                          * Must update the flags,  bummer, which means any
1910                          * IFA locks must now be applied HERE <->
1911                          */
1912                         if (do_update) {
1913                                 sctp_gather_internal_ifa_flags(ifa);
1914                         }
1915                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1916                                 return (0);
1917                         }
1918                         /* ok to use deprecated addresses? */
1919                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1920                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1921                                 /* skip unspecifed addresses */
1922                                 return (0);
1923                         }
1924                         if (    /* (local_scope == 0) && */
1925                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1926                                 return (0);
1927                         }
1928                         if ((site_scope == 0) &&
1929                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1930                                 return (0);
1931                         }
1932                 } else {
1933                         return (0);
1934                 }
1935                 break;
1936 #endif
1937         default:
1938                 return (0);
1939         }
1940         return (1);
1941 }
1942
1943 static struct mbuf *
1944 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1945 {
1946         struct sctp_paramhdr *parmh;
1947         struct mbuf *mret;
1948         int len;
1949
1950         switch (ifa->address.sa.sa_family) {
1951 #ifdef INET
1952         case AF_INET:
1953                 len = sizeof(struct sctp_ipv4addr_param);
1954                 break;
1955 #endif
1956 #ifdef INET6
1957         case AF_INET6:
1958                 len = sizeof(struct sctp_ipv6addr_param);
1959                 break;
1960 #endif
1961         default:
1962                 return (m);
1963         }
1964         if (M_TRAILINGSPACE(m) >= len) {
1965                 /* easy side we just drop it on the end */
1966                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1967                 mret = m;
1968         } else {
1969                 /* Need more space */
1970                 mret = m;
1971                 while (SCTP_BUF_NEXT(mret) != NULL) {
1972                         mret = SCTP_BUF_NEXT(mret);
1973                 }
1974                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1975                 if (SCTP_BUF_NEXT(mret) == NULL) {
1976                         /* We are hosed, can't add more addresses */
1977                         return (m);
1978                 }
1979                 mret = SCTP_BUF_NEXT(mret);
1980                 parmh = mtod(mret, struct sctp_paramhdr *);
1981         }
1982         /* now add the parameter */
1983         switch (ifa->address.sa.sa_family) {
1984 #ifdef INET
1985         case AF_INET:
1986                 {
1987                         struct sctp_ipv4addr_param *ipv4p;
1988                         struct sockaddr_in *sin;
1989
1990                         sin = (struct sockaddr_in *)&ifa->address.sin;
1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1993                         parmh->param_length = htons(len);
1994                         ipv4p->addr = sin->sin_addr.s_addr;
1995                         SCTP_BUF_LEN(mret) += len;
1996                         break;
1997                 }
1998 #endif
1999 #ifdef INET6
2000         case AF_INET6:
2001                 {
2002                         struct sctp_ipv6addr_param *ipv6p;
2003                         struct sockaddr_in6 *sin6;
2004
2005                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2008                         parmh->param_length = htons(len);
2009                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2010                             sizeof(ipv6p->addr));
2011                         /* clear embedded scope in the address */
2012                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2013                         SCTP_BUF_LEN(mret) += len;
2014                         break;
2015                 }
2016 #endif
2017         default:
2018                 return (m);
2019         }
2020         return (mret);
2021 }
2022
2023
2024 struct mbuf *
2025 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2026     struct sctp_scoping *scope,
2027     struct mbuf *m_at, int cnt_inits_to)
2028 {
2029         struct sctp_vrf *vrf = NULL;
2030         int cnt, limit_out = 0, total_count;
2031         uint32_t vrf_id;
2032
2033         vrf_id = inp->def_vrf_id;
2034         SCTP_IPI_ADDR_RLOCK();
2035         vrf = sctp_find_vrf(vrf_id);
2036         if (vrf == NULL) {
2037                 SCTP_IPI_ADDR_RUNLOCK();
2038                 return (m_at);
2039         }
2040         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2041                 struct sctp_ifa *sctp_ifap;
2042                 struct sctp_ifn *sctp_ifnp;
2043
2044                 cnt = cnt_inits_to;
2045                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2046                         limit_out = 1;
2047                         cnt = SCTP_ADDRESS_LIMIT;
2048                         goto skip_count;
2049                 }
2050                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2051                         if ((scope->loopback_scope == 0) &&
2052                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2053                                 /*
2054                                  * Skip loopback devices if loopback_scope
2055                                  * not set
2056                                  */
2057                                 continue;
2058                         }
2059                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2060                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2061                                         continue;
2062                                 }
2063                                 if (sctp_is_address_in_scope(sctp_ifap,
2064                                     scope->ipv4_addr_legal,
2065                                     scope->ipv6_addr_legal,
2066                                     scope->loopback_scope,
2067                                     scope->ipv4_local_scope,
2068                                     scope->local_scope,
2069                                     scope->site_scope, 1) == 0) {
2070                                         continue;
2071                                 }
2072                                 cnt++;
2073                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2074                                         break;
2075                                 }
2076                         }
2077                         if (cnt > SCTP_ADDRESS_LIMIT) {
2078                                 break;
2079                         }
2080                 }
2081 skip_count:
2082                 if (cnt > 1) {
2083                         total_count = 0;
2084                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2085                                 cnt = 0;
2086                                 if ((scope->loopback_scope == 0) &&
2087                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2088                                         /*
2089                                          * Skip loopback devices if
2090                                          * loopback_scope not set
2091                                          */
2092                                         continue;
2093                                 }
2094                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2095                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2096                                                 continue;
2097                                         }
2098                                         if (sctp_is_address_in_scope(sctp_ifap,
2099                                             scope->ipv4_addr_legal,
2100                                             scope->ipv6_addr_legal,
2101                                             scope->loopback_scope,
2102                                             scope->ipv4_local_scope,
2103                                             scope->local_scope,
2104                                             scope->site_scope, 0) == 0) {
2105                                                 continue;
2106                                         }
2107                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2108                                         if (limit_out) {
2109                                                 cnt++;
2110                                                 total_count++;
2111                                                 if (cnt >= 2) {
2112                                                         /*
2113                                                          * two from each
2114                                                          * address
2115                                                          */
2116                                                         break;
2117                                                 }
2118                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2119                                                         /* No more addresses */
2120                                                         break;
2121                                                 }
2122                                         }
2123                                 }
2124                         }
2125                 }
2126         } else {
2127                 struct sctp_laddr *laddr;
2128
2129                 cnt = cnt_inits_to;
2130                 /* First, how many ? */
2131                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2132                         if (laddr->ifa == NULL) {
2133                                 continue;
2134                         }
2135                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2136                                 /*
2137                                  * Address being deleted by the system, dont
2138                                  * list.
2139                                  */
2140                                 continue;
2141                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2142                                 /*
2143                                  * Address being deleted on this ep don't
2144                                  * list.
2145                                  */
2146                                 continue;
2147                         }
2148                         if (sctp_is_address_in_scope(laddr->ifa,
2149                             scope->ipv4_addr_legal,
2150                             scope->ipv6_addr_legal,
2151                             scope->loopback_scope,
2152                             scope->ipv4_local_scope,
2153                             scope->local_scope,
2154                             scope->site_scope, 1) == 0) {
2155                                 continue;
2156                         }
2157                         cnt++;
2158                 }
2159                 if (cnt > SCTP_ADDRESS_LIMIT) {
2160                         limit_out = 1;
2161                 }
2162                 /*
2163                  * To get through a NAT we only list addresses if we have
2164                  * more than one. That way if you just bind a single address
2165                  * we let the source of the init dictate our address.
2166                  */
2167                 if (cnt > 1) {
2168                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2169                                 cnt = 0;
2170                                 if (laddr->ifa == NULL) {
2171                                         continue;
2172                                 }
2173                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2174                                         continue;
2175
2176                                 if (sctp_is_address_in_scope(laddr->ifa,
2177                                     scope->ipv4_addr_legal,
2178                                     scope->ipv6_addr_legal,
2179                                     scope->loopback_scope,
2180                                     scope->ipv4_local_scope,
2181                                     scope->local_scope,
2182                                     scope->site_scope, 0) == 0) {
2183                                         continue;
2184                                 }
2185                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2186                                 cnt++;
2187                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2188                                         break;
2189                                 }
2190                         }
2191                 }
2192         }
2193         SCTP_IPI_ADDR_RUNLOCK();
2194         return (m_at);
2195 }
2196
2197 static struct sctp_ifa *
2198 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2199     uint8_t dest_is_loop,
2200     uint8_t dest_is_priv,
2201     sa_family_t fam)
2202 {
2203         uint8_t dest_is_global = 0;
2204
2205         /* dest_is_priv is true if destination is a private address */
2206         /* dest_is_loop is true if destination is a loopback addresses */
2207
2208         /**
2209          * Here we determine if its a preferred address. A preferred address
2210          * means it is the same scope or higher scope then the destination.
2211          * L = loopback, P = private, G = global
2212          * -----------------------------------------
2213          *    src    |  dest | result
2214          *  ----------------------------------------
2215          *     L     |    L  |    yes
2216          *  -----------------------------------------
2217          *     P     |    L  |    yes-v4 no-v6
2218          *  -----------------------------------------
2219          *     G     |    L  |    yes-v4 no-v6
2220          *  -----------------------------------------
2221          *     L     |    P  |    no
2222          *  -----------------------------------------
2223          *     P     |    P  |    yes
2224          *  -----------------------------------------
2225          *     G     |    P  |    no
2226          *   -----------------------------------------
2227          *     L     |    G  |    no
2228          *   -----------------------------------------
2229          *     P     |    G  |    no
2230          *    -----------------------------------------
2231          *     G     |    G  |    yes
2232          *    -----------------------------------------
2233          */
2234
2235         if (ifa->address.sa.sa_family != fam) {
2236                 /* forget mis-matched family */
2237                 return (NULL);
2238         }
2239         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2240                 dest_is_global = 1;
2241         }
2242         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2243         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2244         /* Ok the address may be ok */
2245 #ifdef INET6
2246         if (fam == AF_INET6) {
2247                 /* ok to use deprecated addresses? no lets not! */
2248                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2249                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2250                         return (NULL);
2251                 }
2252                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2253                         if (dest_is_loop) {
2254                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2255                                 return (NULL);
2256                         }
2257                 }
2258                 if (ifa->src_is_glob) {
2259                         if (dest_is_loop) {
2260                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2261                                 return (NULL);
2262                         }
2263                 }
2264         }
2265 #endif
2266         /*
2267          * Now that we know what is what, implement or table this could in
2268          * theory be done slicker (it used to be), but this is
2269          * straightforward and easier to validate :-)
2270          */
2271         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2272             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2273         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2274             dest_is_loop, dest_is_priv, dest_is_global);
2275
2276         if ((ifa->src_is_loop) && (dest_is_priv)) {
2277                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2278                 return (NULL);
2279         }
2280         if ((ifa->src_is_glob) && (dest_is_priv)) {
2281                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2282                 return (NULL);
2283         }
2284         if ((ifa->src_is_loop) && (dest_is_global)) {
2285                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2286                 return (NULL);
2287         }
2288         if ((ifa->src_is_priv) && (dest_is_global)) {
2289                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2290                 return (NULL);
2291         }
2292         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2293         /* its a preferred address */
2294         return (ifa);
2295 }
2296
2297 static struct sctp_ifa *
2298 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2299     uint8_t dest_is_loop,
2300     uint8_t dest_is_priv,
2301     sa_family_t fam)
2302 {
2303         uint8_t dest_is_global = 0;
2304
2305         /**
2306          * Here we determine if its a acceptable address. A acceptable
2307          * address means it is the same scope or higher scope but we can
2308          * allow for NAT which means its ok to have a global dest and a
2309          * private src.
2310          *
2311          * L = loopback, P = private, G = global
2312          * -----------------------------------------
2313          *  src    |  dest | result
2314          * -----------------------------------------
2315          *   L     |   L   |    yes
2316          *  -----------------------------------------
2317          *   P     |   L   |    yes-v4 no-v6
2318          *  -----------------------------------------
2319          *   G     |   L   |    yes
2320          * -----------------------------------------
2321          *   L     |   P   |    no
2322          * -----------------------------------------
2323          *   P     |   P   |    yes
2324          * -----------------------------------------
2325          *   G     |   P   |    yes - May not work
2326          * -----------------------------------------
2327          *   L     |   G   |    no
2328          * -----------------------------------------
2329          *   P     |   G   |    yes - May not work
2330          * -----------------------------------------
2331          *   G     |   G   |    yes
2332          * -----------------------------------------
2333          */
2334
2335         if (ifa->address.sa.sa_family != fam) {
2336                 /* forget non matching family */
2337                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2338                     ifa->address.sa.sa_family, fam);
2339                 return (NULL);
2340         }
2341         /* Ok the address may be ok */
2342         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2343         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2344             dest_is_loop, dest_is_priv);
2345         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2346                 dest_is_global = 1;
2347         }
2348 #ifdef INET6
2349         if (fam == AF_INET6) {
2350                 /* ok to use deprecated addresses? */
2351                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2352                         return (NULL);
2353                 }
2354                 if (ifa->src_is_priv) {
2355                         /* Special case, linklocal to loop */
2356                         if (dest_is_loop)
2357                                 return (NULL);
2358                 }
2359         }
2360 #endif
2361         /*
2362          * Now that we know what is what, implement our table. This could in
2363          * theory be done slicker (it used to be), but this is
2364          * straightforward and easier to validate :-)
2365          */
2366         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2367             ifa->src_is_loop,
2368             dest_is_priv);
2369         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2370                 return (NULL);
2371         }
2372         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2373             ifa->src_is_loop,
2374             dest_is_global);
2375         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2376                 return (NULL);
2377         }
2378         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2379         /* its an acceptable address */
2380         return (ifa);
2381 }
2382
2383 int
2384 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2385 {
2386         struct sctp_laddr *laddr;
2387
2388         if (stcb == NULL) {
2389                 /* There are no restrictions, no TCB :-) */
2390                 return (0);
2391         }
2392         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2393                 if (laddr->ifa == NULL) {
2394                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2395                             __FUNCTION__);
2396                         continue;
2397                 }
2398                 if (laddr->ifa == ifa) {
2399                         /* Yes it is on the list */
2400                         return (1);
2401                 }
2402         }
2403         return (0);
2404 }
2405
2406
2407 int
2408 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2409 {
2410         struct sctp_laddr *laddr;
2411
2412         if (ifa == NULL)
2413                 return (0);
2414         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2415                 if (laddr->ifa == NULL) {
2416                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2417                             __FUNCTION__);
2418                         continue;
2419                 }
2420                 if ((laddr->ifa == ifa) && laddr->action == 0)
2421                         /* same pointer */
2422                         return (1);
2423         }
2424         return (0);
2425 }
2426
2427
2428
2429 static struct sctp_ifa *
2430 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2431     sctp_route_t * ro,
2432     uint32_t vrf_id,
2433     int non_asoc_addr_ok,
2434     uint8_t dest_is_priv,
2435     uint8_t dest_is_loop,
2436     sa_family_t fam)
2437 {
2438         struct sctp_laddr *laddr, *starting_point;
2439         void *ifn;
2440         int resettotop = 0;
2441         struct sctp_ifn *sctp_ifn;
2442         struct sctp_ifa *sctp_ifa, *sifa;
2443         struct sctp_vrf *vrf;
2444         uint32_t ifn_index;
2445
2446         vrf = sctp_find_vrf(vrf_id);
2447         if (vrf == NULL)
2448                 return (NULL);
2449
2450         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2451         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2452         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2453         /*
2454          * first question, is the ifn we will emit on in our list, if so, we
2455          * want such an address. Note that we first looked for a preferred
2456          * address.
2457          */
2458         if (sctp_ifn) {
2459                 /* is a preferred one on the interface we route out? */
2460                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2461                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2462                             (non_asoc_addr_ok == 0))
2463                                 continue;
2464                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2465                             dest_is_loop,
2466                             dest_is_priv, fam);
2467                         if (sifa == NULL)
2468                                 continue;
2469                         if (sctp_is_addr_in_ep(inp, sifa)) {
2470                                 atomic_add_int(&sifa->refcount, 1);
2471                                 return (sifa);
2472                         }
2473                 }
2474         }
2475         /*
2476          * ok, now we now need to find one on the list of the addresses. We
2477          * can't get one on the emitting interface so let's find first a
2478          * preferred one. If not that an acceptable one otherwise... we
2479          * return NULL.
2480          */
2481         starting_point = inp->next_addr_touse;
2482 once_again:
2483         if (inp->next_addr_touse == NULL) {
2484                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2485                 resettotop = 1;
2486         }
2487         for (laddr = inp->next_addr_touse; laddr;
2488             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2489                 if (laddr->ifa == NULL) {
2490                         /* address has been removed */
2491                         continue;
2492                 }
2493                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2494                         /* address is being deleted */
2495                         continue;
2496                 }
2497                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2498                     dest_is_priv, fam);
2499                 if (sifa == NULL)
2500                         continue;
2501                 atomic_add_int(&sifa->refcount, 1);
2502                 return (sifa);
2503         }
2504         if (resettotop == 0) {
2505                 inp->next_addr_touse = NULL;
2506                 goto once_again;
2507         }
2508         inp->next_addr_touse = starting_point;
2509         resettotop = 0;
2510 once_again_too:
2511         if (inp->next_addr_touse == NULL) {
2512                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2513                 resettotop = 1;
2514         }
2515         /* ok, what about an acceptable address in the inp */
2516         for (laddr = inp->next_addr_touse; laddr;
2517             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2518                 if (laddr->ifa == NULL) {
2519                         /* address has been removed */
2520                         continue;
2521                 }
2522                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2523                         /* address is being deleted */
2524                         continue;
2525                 }
2526                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2527                     dest_is_priv, fam);
2528                 if (sifa == NULL)
2529                         continue;
2530                 atomic_add_int(&sifa->refcount, 1);
2531                 return (sifa);
2532         }
2533         if (resettotop == 0) {
2534                 inp->next_addr_touse = NULL;
2535                 goto once_again_too;
2536         }
2537         /*
2538          * no address bound can be a source for the destination we are in
2539          * trouble
2540          */
2541         return (NULL);
2542 }
2543
2544
2545
2546 static struct sctp_ifa *
2547 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2548     struct sctp_tcb *stcb,
2549     struct sctp_nets *net,
2550     sctp_route_t * ro,
2551     uint32_t vrf_id,
2552     uint8_t dest_is_priv,
2553     uint8_t dest_is_loop,
2554     int non_asoc_addr_ok,
2555     sa_family_t fam)
2556 {
2557         struct sctp_laddr *laddr, *starting_point;
2558         void *ifn;
2559         struct sctp_ifn *sctp_ifn;
2560         struct sctp_ifa *sctp_ifa, *sifa;
2561         uint8_t start_at_beginning = 0;
2562         struct sctp_vrf *vrf;
2563         uint32_t ifn_index;
2564
2565         /*
2566          * first question, is the ifn we will emit on in our list, if so, we
2567          * want that one.
2568          */
2569         vrf = sctp_find_vrf(vrf_id);
2570         if (vrf == NULL)
2571                 return (NULL);
2572
2573         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2574         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2575         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2576
2577         /*
2578          * first question, is the ifn we will emit on in our list?  If so,
2579          * we want that one. First we look for a preferred. Second, we go
2580          * for an acceptable.
2581          */
2582         if (sctp_ifn) {
2583                 /* first try for a preferred address on the ep */
2584                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2585                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2586                                 continue;
2587                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2588                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2589                                 if (sifa == NULL)
2590                                         continue;
2591                                 if (((non_asoc_addr_ok == 0) &&
2592                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2593                                     (non_asoc_addr_ok &&
2594                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2595                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2596                                         /* on the no-no list */
2597                                         continue;
2598                                 }
2599                                 atomic_add_int(&sifa->refcount, 1);
2600                                 return (sifa);
2601                         }
2602                 }
2603                 /* next try for an acceptable address on the ep */
2604                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2605                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2606                                 continue;
2607                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2608                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2609                                 if (sifa == NULL)
2610                                         continue;
2611                                 if (((non_asoc_addr_ok == 0) &&
2612                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2613                                     (non_asoc_addr_ok &&
2614                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2615                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2616                                         /* on the no-no list */
2617                                         continue;
2618                                 }
2619                                 atomic_add_int(&sifa->refcount, 1);
2620                                 return (sifa);
2621                         }
2622                 }
2623
2624         }
2625         /*
2626          * if we can't find one like that then we must look at all addresses
2627          * bound to pick one at first preferable then secondly acceptable.
2628          */
2629         starting_point = stcb->asoc.last_used_address;
2630 sctp_from_the_top:
2631         if (stcb->asoc.last_used_address == NULL) {
2632                 start_at_beginning = 1;
2633                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2634         }
2635         /* search beginning with the last used address */
2636         for (laddr = stcb->asoc.last_used_address; laddr;
2637             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2638                 if (laddr->ifa == NULL) {
2639                         /* address has been removed */
2640                         continue;
2641                 }
2642                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2643                         /* address is being deleted */
2644                         continue;
2645                 }
2646                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2647                 if (sifa == NULL)
2648                         continue;
2649                 if (((non_asoc_addr_ok == 0) &&
2650                     (sctp_is_addr_restricted(stcb, sifa))) ||
2651                     (non_asoc_addr_ok &&
2652                     (sctp_is_addr_restricted(stcb, sifa)) &&
2653                     (!sctp_is_addr_pending(stcb, sifa)))) {
2654                         /* on the no-no list */
2655                         continue;
2656                 }
2657                 stcb->asoc.last_used_address = laddr;
2658                 atomic_add_int(&sifa->refcount, 1);
2659                 return (sifa);
2660         }
2661         if (start_at_beginning == 0) {
2662                 stcb->asoc.last_used_address = NULL;
2663                 goto sctp_from_the_top;
2664         }
2665         /* now try for any higher scope than the destination */
2666         stcb->asoc.last_used_address = starting_point;
2667         start_at_beginning = 0;
2668 sctp_from_the_top2:
2669         if (stcb->asoc.last_used_address == NULL) {
2670                 start_at_beginning = 1;
2671                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2672         }
2673         /* search beginning with the last used address */
2674         for (laddr = stcb->asoc.last_used_address; laddr;
2675             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2676                 if (laddr->ifa == NULL) {
2677                         /* address has been removed */
2678                         continue;
2679                 }
2680                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2681                         /* address is being deleted */
2682                         continue;
2683                 }
2684                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2685                     dest_is_priv, fam);
2686                 if (sifa == NULL)
2687                         continue;
2688                 if (((non_asoc_addr_ok == 0) &&
2689                     (sctp_is_addr_restricted(stcb, sifa))) ||
2690                     (non_asoc_addr_ok &&
2691                     (sctp_is_addr_restricted(stcb, sifa)) &&
2692                     (!sctp_is_addr_pending(stcb, sifa)))) {
2693                         /* on the no-no list */
2694                         continue;
2695                 }
2696                 stcb->asoc.last_used_address = laddr;
2697                 atomic_add_int(&sifa->refcount, 1);
2698                 return (sifa);
2699         }
2700         if (start_at_beginning == 0) {
2701                 stcb->asoc.last_used_address = NULL;
2702                 goto sctp_from_the_top2;
2703         }
2704         return (NULL);
2705 }
2706
2707 static struct sctp_ifa *
2708 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2709     struct sctp_tcb *stcb,
2710     int non_asoc_addr_ok,
2711     uint8_t dest_is_loop,
2712     uint8_t dest_is_priv,
2713     int addr_wanted,
2714     sa_family_t fam,
2715     sctp_route_t * ro
2716 )
2717 {
2718         struct sctp_ifa *ifa, *sifa;
2719         int num_eligible_addr = 0;
2720
2721 #ifdef INET6
2722         struct sockaddr_in6 sin6, lsa6;
2723
2724         if (fam == AF_INET6) {
2725                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2726                 (void)sa6_recoverscope(&sin6);
2727         }
2728 #endif                          /* INET6 */
2729         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2730                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2731                     (non_asoc_addr_ok == 0))
2732                         continue;
2733                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2734                     dest_is_priv, fam);
2735                 if (sifa == NULL)
2736                         continue;
2737 #ifdef INET6
2738                 if (fam == AF_INET6 &&
2739                     dest_is_loop &&
2740                     sifa->src_is_loop && sifa->src_is_priv) {
2741                         /*
2742                          * don't allow fe80::1 to be a src on loop ::1, we
2743                          * don't list it to the peer so we will get an
2744                          * abort.
2745                          */
2746                         continue;
2747                 }
2748                 if (fam == AF_INET6 &&
2749                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2750                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2751                         /*
2752                          * link-local <-> link-local must belong to the same
2753                          * scope.
2754                          */
2755                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2756                         (void)sa6_recoverscope(&lsa6);
2757                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2758                                 continue;
2759                         }
2760                 }
2761 #endif                          /* INET6 */
2762
2763                 /*
2764                  * Check if the IPv6 address matches to next-hop. In the
2765                  * mobile case, old IPv6 address may be not deleted from the
2766                  * interface. Then, the interface has previous and new
2767                  * addresses.  We should use one corresponding to the
2768                  * next-hop.  (by micchie)
2769                  */
2770 #ifdef INET6
2771                 if (stcb && fam == AF_INET6 &&
2772                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2773                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2774                             == 0) {
2775                                 continue;
2776                         }
2777                 }
2778 #endif
2779 #ifdef INET
2780                 /* Avoid topologically incorrect IPv4 address */
2781                 if (stcb && fam == AF_INET &&
2782                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2783                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2784                                 continue;
2785                         }
2786                 }
2787 #endif
2788                 if (stcb) {
2789                         if (sctp_is_address_in_scope(ifa,
2790                             stcb->asoc.ipv4_addr_legal,
2791                             stcb->asoc.ipv6_addr_legal,
2792                             stcb->asoc.loopback_scope,
2793                             stcb->asoc.ipv4_local_scope,
2794                             stcb->asoc.local_scope,
2795                             stcb->asoc.site_scope, 0) == 0) {
2796                                 continue;
2797                         }
2798                         if (((non_asoc_addr_ok == 0) &&
2799                             (sctp_is_addr_restricted(stcb, sifa))) ||
2800                             (non_asoc_addr_ok &&
2801                             (sctp_is_addr_restricted(stcb, sifa)) &&
2802                             (!sctp_is_addr_pending(stcb, sifa)))) {
2803                                 /*
2804                                  * It is restricted for some reason..
2805                                  * probably not yet added.
2806                                  */
2807                                 continue;
2808                         }
2809                 }
2810                 if (num_eligible_addr >= addr_wanted) {
2811                         return (sifa);
2812                 }
2813                 num_eligible_addr++;
2814         }
2815         return (NULL);
2816 }
2817
2818
2819 static int
2820 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2821     struct sctp_tcb *stcb,
2822     int non_asoc_addr_ok,
2823     uint8_t dest_is_loop,
2824     uint8_t dest_is_priv,
2825     sa_family_t fam)
2826 {
2827         struct sctp_ifa *ifa, *sifa;
2828         int num_eligible_addr = 0;
2829
2830         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2831                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2832                     (non_asoc_addr_ok == 0)) {
2833                         continue;
2834                 }
2835                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2836                     dest_is_priv, fam);
2837                 if (sifa == NULL) {
2838                         continue;
2839                 }
2840                 if (stcb) {
2841                         if (sctp_is_address_in_scope(ifa,
2842                             stcb->asoc.ipv4_addr_legal,
2843                             stcb->asoc.ipv6_addr_legal,
2844                             stcb->asoc.loopback_scope,
2845                             stcb->asoc.ipv4_local_scope,
2846                             stcb->asoc.local_scope,
2847                             stcb->asoc.site_scope, 0) == 0) {
2848                                 continue;
2849                         }
2850                         if (((non_asoc_addr_ok == 0) &&
2851                             (sctp_is_addr_restricted(stcb, sifa))) ||
2852                             (non_asoc_addr_ok &&
2853                             (sctp_is_addr_restricted(stcb, sifa)) &&
2854                             (!sctp_is_addr_pending(stcb, sifa)))) {
2855                                 /*
2856                                  * It is restricted for some reason..
2857                                  * probably not yet added.
2858                                  */
2859                                 continue;
2860                         }
2861                 }
2862                 num_eligible_addr++;
2863         }
2864         return (num_eligible_addr);
2865 }
2866
2867 static struct sctp_ifa *
2868 sctp_choose_boundall(struct sctp_inpcb *inp,
2869     struct sctp_tcb *stcb,
2870     struct sctp_nets *net,
2871     sctp_route_t * ro,
2872     uint32_t vrf_id,
2873     uint8_t dest_is_priv,
2874     uint8_t dest_is_loop,
2875     int non_asoc_addr_ok,
2876     sa_family_t fam)
2877 {
2878         int cur_addr_num = 0, num_preferred = 0;
2879         void *ifn;
2880         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2881         struct sctp_ifa *sctp_ifa, *sifa;
2882         uint32_t ifn_index;
2883         struct sctp_vrf *vrf;
2884
2885 #ifdef INET
2886         int retried = 0;
2887
2888 #endif
2889         /*-
2890          * For boundall we can use any address in the association.
2891          * If non_asoc_addr_ok is set we can use any address (at least in
2892          * theory). So we look for preferred addresses first. If we find one,
2893          * we use it. Otherwise we next try to get an address on the
2894          * interface, which we should be able to do (unless non_asoc_addr_ok
2895          * is false and we are routed out that way). In these cases where we
2896          * can't use the address of the interface we go through all the
2897          * ifn's looking for an address we can use and fill that in. Punting
2898          * means we send back address 0, which will probably cause problems
2899          * actually since then IP will fill in the address of the route ifn,
2900          * which means we probably already rejected it.. i.e. here comes an
2901          * abort :-<.
2902          */
2903         vrf = sctp_find_vrf(vrf_id);
2904         if (vrf == NULL)
2905                 return (NULL);
2906
2907         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2908         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2909         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2910         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2911         if (sctp_ifn == NULL) {
2912                 /* ?? We don't have this guy ?? */
2913                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2914                 goto bound_all_plan_b;
2915         }
2916         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2917             ifn_index, sctp_ifn->ifn_name);
2918
2919         if (net) {
2920                 cur_addr_num = net->indx_of_eligible_next_to_use;
2921         }
2922         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2923             stcb,
2924             non_asoc_addr_ok,
2925             dest_is_loop,
2926             dest_is_priv, fam);
2927         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2928             num_preferred, sctp_ifn->ifn_name);
2929         if (num_preferred == 0) {
2930                 /*
2931                  * no eligible addresses, we must use some other interface
2932                  * address if we can find one.
2933                  */
2934                 goto bound_all_plan_b;
2935         }
2936         /*
2937          * Ok we have num_eligible_addr set with how many we can use, this
2938          * may vary from call to call due to addresses being deprecated
2939          * etc..
2940          */
2941         if (cur_addr_num >= num_preferred) {
2942                 cur_addr_num = 0;
2943         }
2944         /*
2945          * select the nth address from the list (where cur_addr_num is the
2946          * nth) and 0 is the first one, 1 is the second one etc...
2947          */
2948         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2949
2950         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2951             dest_is_priv, cur_addr_num, fam, ro);
2952
2953         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2954         if (sctp_ifa) {
2955                 atomic_add_int(&sctp_ifa->refcount, 1);
2956                 if (net) {
2957                         /* save off where the next one we will want */
2958                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2959                 }
2960                 return (sctp_ifa);
2961         }
2962         /*
2963          * plan_b: Look at all interfaces and find a preferred address. If
2964          * no preferred fall through to plan_c.
2965          */
2966 bound_all_plan_b:
2967         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2968         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2969                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2970                     sctp_ifn->ifn_name);
2971                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2972                         /* wrong base scope */
2973                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2974                         continue;
2975                 }
2976                 if ((sctp_ifn == looked_at) && looked_at) {
2977                         /* already looked at this guy */
2978                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2979                         continue;
2980                 }
2981                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2982                     dest_is_loop, dest_is_priv, fam);
2983                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2984                     "Found ifn:%p %d preferred source addresses\n",
2985                     ifn, num_preferred);
2986                 if (num_preferred == 0) {
2987                         /* None on this interface. */
2988                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2989                         continue;
2990                 }
2991                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2992                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2993                     num_preferred, sctp_ifn, cur_addr_num);
2994
2995                 /*
2996                  * Ok we have num_eligible_addr set with how many we can
2997                  * use, this may vary from call to call due to addresses
2998                  * being deprecated etc..
2999                  */
3000                 if (cur_addr_num >= num_preferred) {
3001                         cur_addr_num = 0;
3002                 }
3003                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
3004                     dest_is_priv, cur_addr_num, fam, ro);
3005                 if (sifa == NULL)
3006                         continue;
3007                 if (net) {
3008                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3009                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3010                             cur_addr_num);
3011                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3012                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3013                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3014                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3015                 }
3016                 atomic_add_int(&sifa->refcount, 1);
3017                 return (sifa);
3018         }
3019 #ifdef INET
3020 again_with_private_addresses_allowed:
3021 #endif
3022         /* plan_c: do we have an acceptable address on the emit interface */
3023         sifa = NULL;
3024         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3025         if (emit_ifn == NULL) {
3026                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3027                 goto plan_d;
3028         }
3029         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3030                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3031                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3032                     (non_asoc_addr_ok == 0)) {
3033                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3034                         continue;
3035                 }
3036                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3037                     dest_is_priv, fam);
3038                 if (sifa == NULL) {
3039                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3040                         continue;
3041                 }
3042                 if (stcb) {
3043                         if (sctp_is_address_in_scope(sifa,
3044                             stcb->asoc.ipv4_addr_legal,
3045                             stcb->asoc.ipv6_addr_legal,
3046                             stcb->asoc.loopback_scope,
3047                             stcb->asoc.ipv4_local_scope,
3048                             stcb->asoc.local_scope,
3049                             stcb->asoc.site_scope, 0) == 0) {
3050                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3051                                 sifa = NULL;
3052                                 continue;
3053                         }
3054                         if (((non_asoc_addr_ok == 0) &&
3055                             (sctp_is_addr_restricted(stcb, sifa))) ||
3056                             (non_asoc_addr_ok &&
3057                             (sctp_is_addr_restricted(stcb, sifa)) &&
3058                             (!sctp_is_addr_pending(stcb, sifa)))) {
3059                                 /*
3060                                  * It is restricted for some reason..
3061                                  * probably not yet added.
3062                                  */
3063                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3064                                 sifa = NULL;
3065                                 continue;
3066                         }
3067                 } else {
3068                         printf("Stcb is null - no print\n");
3069                 }
3070                 atomic_add_int(&sifa->refcount, 1);
3071                 goto out;
3072         }
3073 plan_d:
3074         /*
3075          * plan_d: We are in trouble. No preferred address on the emit
3076          * interface. And not even a preferred address on all interfaces. Go
3077          * out and see if we can find an acceptable address somewhere
3078          * amongst all interfaces.
3079          */
3080         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3081         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3082                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3083                         /* wrong base scope */
3084                         continue;
3085                 }
3086                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3087                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3088                             (non_asoc_addr_ok == 0))
3089                                 continue;
3090                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3091                             dest_is_loop,
3092                             dest_is_priv, fam);
3093                         if (sifa == NULL)
3094                                 continue;
3095                         if (stcb) {
3096                                 if (sctp_is_address_in_scope(sifa,
3097                                     stcb->asoc.ipv4_addr_legal,
3098                                     stcb->asoc.ipv6_addr_legal,
3099                                     stcb->asoc.loopback_scope,
3100                                     stcb->asoc.ipv4_local_scope,
3101                                     stcb->asoc.local_scope,
3102                                     stcb->asoc.site_scope, 0) == 0) {
3103                                         sifa = NULL;
3104                                         continue;
3105                                 }
3106                                 if (((non_asoc_addr_ok == 0) &&
3107                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3108                                     (non_asoc_addr_ok &&
3109                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3110                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3111                                         /*
3112                                          * It is restricted for some
3113                                          * reason.. probably not yet added.
3114                                          */
3115                                         sifa = NULL;
3116                                         continue;
3117                                 }
3118                         }
3119                         goto out;
3120                 }
3121         }
3122 #ifdef INET
3123         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3124                 stcb->asoc.ipv4_local_scope = 1;
3125                 retried = 1;
3126                 goto again_with_private_addresses_allowed;
3127         } else if (retried == 1) {
3128                 stcb->asoc.ipv4_local_scope = 0;
3129         }
3130 #endif
3131 out:
3132 #ifdef INET
3133         if (sifa) {
3134                 if (retried == 1) {
3135                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3136                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3137                                         /* wrong base scope */
3138                                         continue;
3139                                 }
3140                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3141                                         struct sctp_ifa *tmp_sifa;
3142
3143                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3144                                             (non_asoc_addr_ok == 0))
3145                                                 continue;
3146                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3147                                             dest_is_loop,
3148                                             dest_is_priv, fam);
3149                                         if (tmp_sifa == NULL) {
3150                                                 continue;
3151                                         }
3152                                         if (tmp_sifa == sifa) {
3153                                                 continue;
3154                                         }
3155                                         if (stcb) {
3156                                                 if (sctp_is_address_in_scope(tmp_sifa,
3157                                                     stcb->asoc.ipv4_addr_legal,
3158                                                     stcb->asoc.ipv6_addr_legal,
3159                                                     stcb->asoc.loopback_scope,
3160                                                     stcb->asoc.ipv4_local_scope,
3161                                                     stcb->asoc.local_scope,
3162                                                     stcb->asoc.site_scope, 0) == 0) {
3163                                                         continue;
3164                                                 }
3165                                                 if (((non_asoc_addr_ok == 0) &&
3166                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3167                                                     (non_asoc_addr_ok &&
3168                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3169                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3170                                                         /*
3171                                                          * It is restricted
3172                                                          * for some reason..
3173                                                          * probably not yet
3174                                                          * added.
3175                                                          */
3176                                                         continue;
3177                                                 }
3178                                         }
3179                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3180                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3181                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3182                                         }
3183                                 }
3184                         }
3185                 }
3186                 atomic_add_int(&sifa->refcount, 1);
3187         }
3188 #endif
3189         return (sifa);
3190 }
3191
3192
3193
3194 /* tcb may be NULL */
3195 struct sctp_ifa *
3196 sctp_source_address_selection(struct sctp_inpcb *inp,
3197     struct sctp_tcb *stcb,
3198     sctp_route_t * ro,
3199     struct sctp_nets *net,
3200     int non_asoc_addr_ok, uint32_t vrf_id)
3201 {
3202         struct sctp_ifa *answer;
3203         uint8_t dest_is_priv, dest_is_loop;
3204         sa_family_t fam;
3205
3206 #ifdef INET
3207         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3208
3209 #endif
3210 #ifdef INET6
3211         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3212
3213 #endif
3214
3215         /**
3216          * Rules: - Find the route if needed, cache if I can. - Look at
3217          * interface address in route, Is it in the bound list. If so we
3218          * have the best source. - If not we must rotate amongst the
3219          * addresses.
3220          *
3221          * Cavets and issues
3222          *
3223          * Do we need to pay attention to scope. We can have a private address
3224          * or a global address we are sourcing or sending to. So if we draw
3225          * it out
3226          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3227          * For V4
3228          * ------------------------------------------
3229          *      source     *      dest  *  result
3230          * -----------------------------------------
3231          * <a>  Private    *    Global  *  NAT
3232          * -----------------------------------------
3233          * <b>  Private    *    Private *  No problem
3234          * -----------------------------------------
3235          * <c>  Global     *    Private *  Huh, How will this work?
3236          * -----------------------------------------
3237          * <d>  Global     *    Global  *  No Problem
3238          *------------------------------------------
3239          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3240          * For V6
3241          *------------------------------------------
3242          *      source     *      dest  *  result
3243          * -----------------------------------------
3244          * <a>  Linklocal  *    Global  *
3245          * -----------------------------------------
3246          * <b>  Linklocal  * Linklocal  *  No problem
3247          * -----------------------------------------
3248          * <c>  Global     * Linklocal  *  Huh, How will this work?
3249          * -----------------------------------------
3250          * <d>  Global     *    Global  *  No Problem
3251          *------------------------------------------
3252          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3253          *
3254          * And then we add to that what happens if there are multiple addresses
3255          * assigned to an interface. Remember the ifa on a ifn is a linked
3256          * list of addresses. So one interface can have more than one IP
3257          * address. What happens if we have both a private and a global
3258          * address? Do we then use context of destination to sort out which
3259          * one is best? And what about NAT's sending P->G may get you a NAT
3260          * translation, or should you select the G thats on the interface in
3261          * preference.
3262          *
3263          * Decisions:
3264          *
3265          * - count the number of addresses on the interface.
3266          * - if it is one, no problem except case <c>.
3267          *   For <a> we will assume a NAT out there.
3268          * - if there are more than one, then we need to worry about scope P
3269          *   or G. We should prefer G -> G and P -> P if possible.
3270          *   Then as a secondary fall back to mixed types G->P being a last
3271          *   ditch one.
3272          * - The above all works for bound all, but bound specific we need to
3273          *   use the same concept but instead only consider the bound
3274          *   addresses. If the bound set is NOT assigned to the interface then
3275          *   we must use rotation amongst the bound addresses..
3276          */
3277         if (ro->ro_rt == NULL) {
3278                 /*
3279                  * Need a route to cache.
3280                  */
3281                 SCTP_RTALLOC(ro, vrf_id);
3282         }
3283         if (ro->ro_rt == NULL) {
3284                 return (NULL);
3285         }
3286         fam = ro->ro_dst.sa_family;
3287         dest_is_priv = dest_is_loop = 0;
3288         /* Setup our scopes for the destination */
3289         switch (fam) {
3290 #ifdef INET
3291         case AF_INET:
3292                 /* Scope based on outbound address */
3293                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3294                         dest_is_loop = 1;
3295                         if (net != NULL) {
3296                                 /* mark it as local */
3297                                 net->addr_is_local = 1;
3298                         }
3299                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3300                         dest_is_priv = 1;
3301                 }
3302                 break;
3303 #endif
3304 #ifdef INET6
3305         case AF_INET6:
3306                 /* Scope based on outbound address */
3307                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3308                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3309                         /*
3310                          * If the address is a loopback address, which
3311                          * consists of "::1" OR "fe80::1%lo0", we are
3312                          * loopback scope. But we don't use dest_is_priv
3313                          * (link local addresses).
3314                          */
3315                         dest_is_loop = 1;
3316                         if (net != NULL) {
3317                                 /* mark it as local */
3318                                 net->addr_is_local = 1;
3319                         }
3320                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3321                         dest_is_priv = 1;
3322                 }
3323                 break;
3324 #endif
3325         }
3326         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3327         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3328         SCTP_IPI_ADDR_RLOCK();
3329         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3330                 /*
3331                  * Bound all case
3332                  */
3333                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3334                     dest_is_priv, dest_is_loop,
3335                     non_asoc_addr_ok, fam);
3336                 SCTP_IPI_ADDR_RUNLOCK();
3337                 return (answer);
3338         }
3339         /*
3340          * Subset bound case
3341          */
3342         if (stcb) {
3343                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
3344                     vrf_id, dest_is_priv,
3345                     dest_is_loop,
3346                     non_asoc_addr_ok, fam);
3347         } else {
3348                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3349                     non_asoc_addr_ok,
3350                     dest_is_priv,
3351                     dest_is_loop, fam);
3352         }
3353         SCTP_IPI_ADDR_RUNLOCK();
3354         return (answer);
3355 }
3356
3357 static int
3358 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3359 {
3360         struct cmsghdr cmh;
3361         int tlen, at, found;
3362         struct sctp_sndinfo sndinfo;
3363         struct sctp_prinfo prinfo;
3364         struct sctp_authinfo authinfo;
3365
3366         tlen = SCTP_BUF_LEN(control);
3367         at = 0;
3368         found = 0;
3369         /*
3370          * Independent of how many mbufs, find the c_type inside the control
3371          * structure and copy out the data.
3372          */
3373         while (at < tlen) {
3374                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3375                         /* There is not enough room for one more. */
3376                         return (found);
3377                 }
3378                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3379                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3380                         /* We dont't have a complete CMSG header. */
3381                         return (found);
3382                 }
3383                 if (((int)cmh.cmsg_len + at) > tlen) {
3384                         /* We don't have the complete CMSG. */
3385                         return (found);
3386                 }
3387                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3388                     ((c_type == cmh.cmsg_type) ||
3389                     ((c_type == SCTP_SNDRCV) &&
3390                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3391                     (cmh.cmsg_type == SCTP_PRINFO) ||
3392                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3393                         if (c_type == cmh.cmsg_type) {
3394                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3395                                         return (found);
3396                                 }
3397                                 /* It is exactly what we want. Copy it out. */
3398                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3399                                 return (1);
3400                         } else {
3401                                 struct sctp_sndrcvinfo *sndrcvinfo;
3402
3403                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3404                                 if (found == 0) {
3405                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3406                                                 return (found);
3407                                         }
3408                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3409                                 }
3410                                 switch (cmh.cmsg_type) {
3411                                 case SCTP_SNDINFO:
3412                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3413                                                 return (found);
3414                                         }
3415                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3416                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3417                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3418                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3419                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3420                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3421                                         break;
3422                                 case SCTP_PRINFO:
3423                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3424                                                 return (found);
3425                                         }
3426                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3427                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3428                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3429                                         break;
3430                                 case SCTP_AUTHINFO:
3431                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3432                                                 return (found);
3433                                         }
3434                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3435                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3436                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keyid;
3437                                         break;
3438                                 default:
3439                                         return (found);
3440                                 }
3441                                 found = 1;
3442                         }
3443                 }
3444                 at += CMSG_ALIGN(cmh.cmsg_len);
3445         }
3446         return (found);
3447 }
3448
3449 static int
3450 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3451 {
3452         struct cmsghdr cmh;
3453         int tlen, at;
3454         struct sctp_initmsg initmsg;
3455
3456 #ifdef INET
3457         struct sockaddr_in sin;
3458
3459 #endif
3460 #ifdef INET6
3461         struct sockaddr_in6 sin6;
3462
3463 #endif
3464
3465         tlen = SCTP_BUF_LEN(control);
3466         at = 0;
3467         while (at < tlen) {
3468                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3469                         /* There is not enough room for one more. */
3470                         *error = EINVAL;
3471                         return (1);
3472                 }
3473                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3474                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3475                         /* We dont't have a complete CMSG header. */
3476                         *error = EINVAL;
3477                         return (1);
3478                 }
3479                 if (((int)cmh.cmsg_len + at) > tlen) {
3480                         /* We don't have the complete CMSG. */
3481                         *error = EINVAL;
3482                         return (1);
3483                 }
3484                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3485                         switch (cmh.cmsg_type) {
3486                         case SCTP_INIT:
3487                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3488                                         *error = EINVAL;
3489                                         return (1);
3490                                 }
3491                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3492                                 if (initmsg.sinit_max_attempts)
3493                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3494                                 if (initmsg.sinit_num_ostreams)
3495                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3496                                 if (initmsg.sinit_max_instreams)
3497                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3498                                 if (initmsg.sinit_max_init_timeo)
3499                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3500                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3501                                         struct sctp_stream_out *tmp_str;
3502                                         unsigned int i;
3503
3504                                         /* Default is NOT correct */
3505                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3506                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3507                                         SCTP_TCB_UNLOCK(stcb);
3508                                         SCTP_MALLOC(tmp_str,
3509                                             struct sctp_stream_out *,
3510                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3511                                             SCTP_M_STRMO);
3512                                         SCTP_TCB_LOCK(stcb);
3513                                         if (tmp_str != NULL) {
3514                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3515                                                 stcb->asoc.strmout = tmp_str;
3516                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3517                                         } else {
3518                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3519                                         }
3520                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3521                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3522                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3523                                                 stcb->asoc.strmout[i].stream_no = i;
3524                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3525                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3526                                         }
3527                                 }
3528                                 break;
3529 #ifdef INET
3530                         case SCTP_DSTADDRV4:
3531                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3532                                         *error = EINVAL;
3533                                         return (1);
3534                                 }
3535                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3536                                 sin.sin_family = AF_INET;
3537                                 sin.sin_len = sizeof(struct sockaddr_in);
3538                                 sin.sin_port = stcb->rport;
3539                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3540                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3541                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3542                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3543                                         *error = EINVAL;
3544                                         return (1);
3545                                 }
3546                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3547                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3548                                         *error = ENOBUFS;
3549                                         return (1);
3550                                 }
3551                                 break;
3552 #endif
3553 #ifdef INET6
3554                         case SCTP_DSTADDRV6:
3555                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3556                                         *error = EINVAL;
3557                                         return (1);
3558                                 }
3559                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3560                                 sin6.sin6_family = AF_INET6;
3561                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3562                                 sin6.sin6_port = stcb->rport;
3563                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3564                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3565                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3566                                         *error = EINVAL;
3567                                         return (1);
3568                                 }
3569 #ifdef INET
3570                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3571                                         in6_sin6_2_sin(&sin, &sin6);
3572                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3573                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3574                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3575                                                 *error = EINVAL;
3576                                                 return (1);
3577                                         }
3578                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3579                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3580                                                 *error = ENOBUFS;
3581                                                 return (1);
3582                                         }
3583                                 } else
3584 #endif
3585                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3586                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3587                                         *error = ENOBUFS;
3588                                         return (1);
3589                                 }
3590                                 break;
3591 #endif
3592                         default:
3593                                 break;
3594                         }
3595                 }
3596                 at += CMSG_ALIGN(cmh.cmsg_len);
3597         }
3598         return (0);
3599 }
3600
3601 static struct sctp_tcb *
3602 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3603     in_port_t port,
3604     struct mbuf *control,
3605     struct sctp_nets **net_p,
3606     int *error)
3607 {
3608         struct cmsghdr cmh;
3609         int tlen, at;
3610         struct sctp_tcb *stcb;
3611         struct sockaddr *addr;
3612
3613 #ifdef INET
3614         struct sockaddr_in sin;
3615
3616 #endif
3617 #ifdef INET6
3618         struct sockaddr_in6 sin6;
3619
3620 #endif
3621
3622         tlen = SCTP_BUF_LEN(control);
3623         at = 0;
3624         while (at < tlen) {
3625                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3626                         /* There is not enough room for one more. */
3627                         *error = EINVAL;
3628                         return (NULL);
3629                 }
3630                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3631                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3632                         /* We dont't have a complete CMSG header. */
3633                         *error = EINVAL;
3634                         return (NULL);
3635                 }
3636                 if (((int)cmh.cmsg_len + at) > tlen) {
3637                         /* We don't have the complete CMSG. */
3638                         *error = EINVAL;
3639                         return (NULL);
3640                 }
3641                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3642                         switch (cmh.cmsg_type) {
3643 #ifdef INET
3644                         case SCTP_DSTADDRV4:
3645                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3646                                         *error = EINVAL;
3647                                         return (NULL);
3648                                 }
3649                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3650                                 sin.sin_family = AF_INET;
3651                                 sin.sin_len = sizeof(struct sockaddr_in);
3652                                 sin.sin_port = port;
3653                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3654                                 addr = (struct sockaddr *)&sin;
3655                                 break;
3656 #endif
3657 #ifdef INET6
3658                         case SCTP_DSTADDRV6:
3659                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3660                                         *error = EINVAL;
3661                                         return (NULL);
3662                                 }
3663                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3664                                 sin6.sin6_family = AF_INET6;
3665                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3666                                 sin6.sin6_port = port;
3667                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3668 #ifdef INET
3669                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3670                                         in6_sin6_2_sin(&sin, &sin6);
3671                                         addr = (struct sockaddr *)&sin;
3672                                 } else
3673 #endif
3674                                         addr = (struct sockaddr *)&sin6;
3675                                 break;
3676 #endif
3677                         default:
3678                                 addr = NULL;
3679                                 break;
3680                         }
3681                         if (addr) {
3682                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3683                                 if (stcb != NULL) {
3684                                         return (stcb);
3685                                 }
3686                         }
3687                 }
3688                 at += CMSG_ALIGN(cmh.cmsg_len);
3689         }
3690         return (NULL);
3691 }
3692
3693 static struct mbuf *
3694 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
3695     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3696 {
3697         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3698         struct sctp_state_cookie *stc;
3699         struct sctp_paramhdr *ph;
3700         uint8_t *foo;
3701         int sig_offset;
3702         uint16_t cookie_sz;
3703
3704         mret = NULL;
3705         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3706             sizeof(struct sctp_paramhdr)), 0,
3707             M_DONTWAIT, 1, MT_DATA);
3708         if (mret == NULL) {
3709                 return (NULL);
3710         }
3711         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3712         if (copy_init == NULL) {
3713                 sctp_m_freem(mret);
3714                 return (NULL);
3715         }
3716 #ifdef SCTP_MBUF_LOGGING
3717         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3718                 struct mbuf *mat;
3719
3720                 mat = copy_init;
3721                 while (mat) {
3722                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3723                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3724                         }
3725                         mat = SCTP_BUF_NEXT(mat);
3726                 }
3727         }
3728 #endif
3729         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3730             M_DONTWAIT);
3731         if (copy_initack == NULL) {
3732                 sctp_m_freem(mret);
3733                 sctp_m_freem(copy_init);
3734                 return (NULL);
3735         }
3736 #ifdef SCTP_MBUF_LOGGING
3737         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3738                 struct mbuf *mat;
3739
3740                 mat = copy_initack;
3741                 while (mat) {
3742                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3743                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3744                         }
3745                         mat = SCTP_BUF_NEXT(mat);
3746                 }
3747         }
3748 #endif
3749         /* easy side we just drop it on the end */
3750         ph = mtod(mret, struct sctp_paramhdr *);
3751         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3752             sizeof(struct sctp_paramhdr);
3753         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3754             sizeof(struct sctp_paramhdr));
3755         ph->param_type = htons(SCTP_STATE_COOKIE);
3756         ph->param_length = 0;   /* fill in at the end */
3757         /* Fill in the stc cookie data */
3758         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3759
3760         /* tack the INIT and then the INIT-ACK onto the chain */
3761         cookie_sz = 0;
3762         m_at = mret;
3763         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3764                 cookie_sz += SCTP_BUF_LEN(m_at);
3765                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3766                         SCTP_BUF_NEXT(m_at) = copy_init;
3767                         break;
3768                 }
3769         }
3770
3771         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3772                 cookie_sz += SCTP_BUF_LEN(m_at);
3773                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3774                         SCTP_BUF_NEXT(m_at) = copy_initack;
3775                         break;
3776                 }
3777         }
3778
3779         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3780                 cookie_sz += SCTP_BUF_LEN(m_at);
3781                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3782                         break;
3783                 }
3784         }
3785         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3786         if (sig == NULL) {
3787                 /* no space, so free the entire chain */
3788                 sctp_m_freem(mret);
3789                 return (NULL);
3790         }
3791         SCTP_BUF_LEN(sig) = 0;
3792         SCTP_BUF_NEXT(m_at) = sig;
3793         sig_offset = 0;
3794         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3795         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3796         *signature = foo;
3797         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3798         cookie_sz += SCTP_SIGNATURE_SIZE;
3799         ph->param_length = htons(cookie_sz);
3800         return (mret);
3801 }
3802
3803
3804 static uint8_t
3805 sctp_get_ect(struct sctp_tcb *stcb,
3806     struct sctp_tmit_chunk *chk)
3807 {
3808         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3809                 return (SCTP_ECT0_BIT);
3810         } else {
3811                 return (0);
3812         }
3813 }
3814
3815 static void
3816 sctp_handle_no_route(struct sctp_tcb *stcb,
3817     struct sctp_nets *net,
3818     int so_locked)
3819 {
3820         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3821
3822         if (net) {
3823                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3824                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3825                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3826                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3827                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3828                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3829                                     stcb,
3830                                     SCTP_FAILED_THRESHOLD,
3831                                     (void *)net,
3832                                     so_locked);
3833                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3834                                 net->dest_state &= ~SCTP_ADDR_PF;
3835                         }
3836                 }
3837                 if (stcb) {
3838                         if (net == stcb->asoc.primary_destination) {
3839                                 /* need a new primary */
3840                                 struct sctp_nets *alt;
3841
3842                                 alt = sctp_find_alternate_net(stcb, net, 0);
3843                                 if (alt != net) {
3844                                         if (stcb->asoc.alternate) {
3845                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3846                                         }
3847                                         stcb->asoc.alternate = alt;
3848                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3849                                         if (net->ro._s_addr) {
3850                                                 sctp_free_ifa(net->ro._s_addr);
3851                                                 net->ro._s_addr = NULL;
3852                                         }
3853                                         net->src_addr_selected = 0;
3854                                 }
3855                         }
3856                 }
3857         }
3858 }
3859
3860 static int
3861 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3862     struct sctp_tcb *stcb,      /* may be NULL */
3863     struct sctp_nets *net,
3864     struct sockaddr *to,
3865     struct mbuf *m,
3866     uint32_t auth_offset,
3867     struct sctp_auth_chunk *auth,
3868     uint16_t auth_keyid,
3869     int nofragment_flag,
3870     int ecn_ok,
3871     struct sctp_tmit_chunk *chk,
3872     int out_of_asoc_ok,
3873     uint16_t src_port,
3874     uint16_t dest_port,
3875     uint32_t v_tag,
3876     uint16_t port,
3877     int so_locked,
3878 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3879     SCTP_UNUSED
3880 #endif
3881     union sctp_sockstore *over_addr,
3882     struct mbuf *init
3883 )
3884 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3885 {
3886         /**
3887          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3888          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3889          * - fill in the HMAC digest of any AUTH chunk in the packet.
3890          * - calculate and fill in the SCTP checksum.
3891          * - prepend an IP address header.
3892          * - if boundall use INADDR_ANY.
3893          * - if boundspecific do source address selection.
3894          * - set fragmentation option for ipV4.
3895          * - On return from IP output, check/adjust mtu size of output
3896          *   interface and smallest_mtu size as well.
3897          */
3898         /* Will need ifdefs around this */
3899         struct mbuf *o_pak;
3900         struct mbuf *newm;
3901         struct sctphdr *sctphdr;
3902         int packet_length;
3903         int ret;
3904         uint32_t vrf_id;
3905         sctp_route_t *ro = NULL;
3906         struct udphdr *udp = NULL;
3907         uint8_t tos_value;
3908
3909 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3910         struct socket *so = NULL;
3911
3912 #endif
3913
3914         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3915                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3916                 sctp_m_freem(m);
3917                 return (EFAULT);
3918         }
3919         if (stcb) {
3920                 vrf_id = stcb->asoc.vrf_id;
3921         } else {
3922                 vrf_id = inp->def_vrf_id;
3923         }
3924
3925         /* fill in the HMAC digest for any AUTH chunk in the packet */
3926         if ((auth != NULL) && (stcb != NULL)) {
3927                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3928         }
3929         if (net) {
3930                 tos_value = net->dscp;
3931         } else if (stcb) {
3932                 tos_value = stcb->asoc.default_dscp;
3933         } else {
3934                 tos_value = inp->sctp_ep.default_dscp;
3935         }
3936
3937         switch (to->sa_family) {
3938 #ifdef INET
3939         case AF_INET:
3940                 {
3941                         struct ip *ip = NULL;
3942                         sctp_route_t iproute;
3943                         int len;
3944
3945                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3946                         if (port) {
3947                                 len += sizeof(struct udphdr);
3948                         }
3949                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3950                         if (newm == NULL) {
3951                                 sctp_m_freem(m);
3952                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3953                                 return (ENOMEM);
3954                         }
3955                         SCTP_ALIGN_TO_END(newm, len);
3956                         SCTP_BUF_LEN(newm) = len;
3957                         SCTP_BUF_NEXT(newm) = m;
3958                         m = newm;
3959                         if (net != NULL) {
3960 #ifdef INVARIANTS
3961                                 if (net->flowidset == 0) {
3962                                         panic("Flow ID not set");
3963                                 }
3964 #endif
3965                                 m->m_pkthdr.flowid = net->flowid;
3966                                 m->m_flags |= M_FLOWID;
3967                         } else {
3968                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3969                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3970                                         m->m_flags |= M_FLOWID;
3971                                 }
3972                         }
3973                         packet_length = sctp_calculate_len(m);
3974                         ip = mtod(m, struct ip *);
3975                         ip->ip_v = IPVERSION;
3976                         ip->ip_hl = (sizeof(struct ip) >> 2);
3977                         if (tos_value == 0) {
3978                                 /*
3979                                  * This means especially, that it is not set
3980                                  * at the SCTP layer. So use the value from
3981                                  * the IP layer.
3982                                  */
3983                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3984                         }
3985                         tos_value &= 0xfc;
3986                         if (ecn_ok) {
3987                                 tos_value |= sctp_get_ect(stcb, chk);
3988                         }
3989                         if ((nofragment_flag) && (port == 0)) {
3990                                 ip->ip_off = IP_DF;
3991                         } else
3992                                 ip->ip_off = 0;
3993
3994                         /* FreeBSD has a function for ip_id's */
3995                         ip->ip_id = ip_newid();
3996
3997                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3998                         ip->ip_len = packet_length;
3999                         ip->ip_tos = tos_value;
4000                         if (port) {
4001                                 ip->ip_p = IPPROTO_UDP;
4002                         } else {
4003                                 ip->ip_p = IPPROTO_SCTP;
4004                         }
4005                         ip->ip_sum = 0;
4006                         if (net == NULL) {
4007                                 ro = &iproute;
4008                                 memset(&iproute, 0, sizeof(iproute));
4009                                 memcpy(&ro->ro_dst, to, to->sa_len);
4010                         } else {
4011                                 ro = (sctp_route_t *) & net->ro;
4012                         }
4013                         /* Now the address selection part */
4014                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4015
4016                         /* call the routine to select the src address */
4017                         if (net && out_of_asoc_ok == 0) {
4018                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4019                                         sctp_free_ifa(net->ro._s_addr);
4020                                         net->ro._s_addr = NULL;
4021                                         net->src_addr_selected = 0;
4022                                         if (ro->ro_rt) {
4023                                                 RTFREE(ro->ro_rt);
4024                                                 ro->ro_rt = NULL;
4025                                         }
4026                                 }
4027                                 if (net->src_addr_selected == 0) {
4028                                         /* Cache the source address */
4029                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4030                                             ro, net, 0,
4031                                             vrf_id);
4032                                         net->src_addr_selected = 1;
4033                                 }
4034                                 if (net->ro._s_addr == NULL) {
4035                                         /* No route to host */
4036                                         net->src_addr_selected = 0;
4037                                         sctp_handle_no_route(stcb, net, so_locked);
4038                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4039                                         sctp_m_freem(m);
4040                                         return (EHOSTUNREACH);
4041                                 }
4042                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4043                         } else {
4044                                 if (over_addr == NULL) {
4045                                         struct sctp_ifa *_lsrc;
4046
4047                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4048                                             net,
4049                                             out_of_asoc_ok,
4050                                             vrf_id);
4051                                         if (_lsrc == NULL) {
4052                                                 sctp_handle_no_route(stcb, net, so_locked);
4053                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4054                                                 sctp_m_freem(m);
4055                                                 return (EHOSTUNREACH);
4056                                         }
4057                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4058                                         sctp_free_ifa(_lsrc);
4059                                 } else {
4060                                         ip->ip_src = over_addr->sin.sin_addr;
4061                                         SCTP_RTALLOC(ro, vrf_id);
4062                                 }
4063                         }
4064                         if (port) {
4065                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4066                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4067                                 udp->uh_dport = port;
4068                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4069                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4070                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4071                         } else {
4072                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4073                         }
4074
4075                         sctphdr->src_port = src_port;
4076                         sctphdr->dest_port = dest_port;
4077                         sctphdr->v_tag = v_tag;
4078                         sctphdr->checksum = 0;
4079
4080                         /*
4081                          * If source address selection fails and we find no
4082                          * route then the ip_output should fail as well with
4083                          * a NO_ROUTE_TO_HOST type error. We probably should
4084                          * catch that somewhere and abort the association
4085                          * right away (assuming this is an INIT being sent).
4086                          */
4087                         if (ro->ro_rt == NULL) {
4088                                 /*
4089                                  * src addr selection failed to find a route
4090                                  * (or valid source addr), so we can't get
4091                                  * there from here (yet)!
4092                                  */
4093                                 sctp_handle_no_route(stcb, net, so_locked);
4094                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4095                                 sctp_m_freem(m);
4096                                 return (EHOSTUNREACH);
4097                         }
4098                         if (ro != &iproute) {
4099                                 memcpy(&iproute, ro, sizeof(*ro));
4100                         }
4101                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4102                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4103                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4104                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4105                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4106                             ro->ro_rt);
4107
4108                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4109                                 /* failed to prepend data, give up */
4110                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4111                                 sctp_m_freem(m);
4112                                 return (ENOMEM);
4113                         }
4114 #ifdef  SCTP_PACKET_LOGGING
4115                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4116                                 sctp_packet_log(m, packet_length);
4117 #endif
4118                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4119                         if (port) {
4120 #if defined(SCTP_WITH_NO_CSUM)
4121                                 SCTP_STAT_INCR(sctps_sendnocrc);
4122 #else
4123                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4124                                     (stcb) &&
4125                                     (stcb->asoc.loopback_scope))) {
4126                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4127                                         SCTP_STAT_INCR(sctps_sendswcrc);
4128                                 } else {
4129                                         SCTP_STAT_INCR(sctps_sendnocrc);
4130                                 }
4131 #endif
4132                                 SCTP_ENABLE_UDP_CSUM(o_pak);
4133                         } else {
4134 #if defined(SCTP_WITH_NO_CSUM)
4135                                 SCTP_STAT_INCR(sctps_sendnocrc);
4136 #else
4137                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4138                                 m->m_pkthdr.csum_data = 0;
4139                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4140 #endif
4141                         }
4142                         /* send it out.  table id is taken from stcb */
4143 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4144                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4145                                 so = SCTP_INP_SO(inp);
4146                                 SCTP_SOCKET_UNLOCK(so, 0);
4147                         }
4148 #endif
4149                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4150 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4151                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4152                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4153                                 SCTP_TCB_UNLOCK(stcb);
4154                                 SCTP_SOCKET_LOCK(so, 0);
4155                                 SCTP_TCB_LOCK(stcb);
4156                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4157                         }
4158 #endif
4159                         SCTP_STAT_INCR(sctps_sendpackets);
4160                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4161                         if (ret)
4162                                 SCTP_STAT_INCR(sctps_senderrors);
4163
4164                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4165                         if (net == NULL) {
4166                                 /* free tempy routes */
4167                                 if (ro->ro_rt) {
4168                                         RTFREE(ro->ro_rt);
4169                                         ro->ro_rt = NULL;
4170                                 }
4171                         } else {
4172                                 /*
4173                                  * PMTU check versus smallest asoc MTU goes
4174                                  * here
4175                                  */
4176                                 if ((ro->ro_rt != NULL) &&
4177                                     (net->ro._s_addr)) {
4178                                         uint32_t mtu;
4179
4180                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4181                                         if (net->port) {
4182                                                 mtu -= sizeof(struct udphdr);
4183                                         }
4184                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4185                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4186                                                 net->mtu = mtu;
4187                                         }
4188                                 } else if (ro->ro_rt == NULL) {
4189                                         /* route was freed */
4190                                         if (net->ro._s_addr &&
4191                                             net->src_addr_selected) {
4192                                                 sctp_free_ifa(net->ro._s_addr);
4193                                                 net->ro._s_addr = NULL;
4194                                         }
4195                                         net->src_addr_selected = 0;
4196                                 }
4197                         }
4198                         return (ret);
4199                 }
4200 #endif
4201 #ifdef INET6
4202         case AF_INET6:
4203                 {
4204                         uint32_t flowlabel, flowinfo;
4205                         struct ip6_hdr *ip6h;
4206                         struct route_in6 ip6route;
4207                         struct ifnet *ifp;
4208                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4209                         int prev_scope = 0;
4210                         struct sockaddr_in6 lsa6_storage;
4211                         int error;
4212                         u_short prev_port = 0;
4213                         int len;
4214
4215                         if (net) {
4216                                 flowlabel = net->flowlabel;
4217                         } else if (stcb) {
4218                                 flowlabel = stcb->asoc.default_flowlabel;
4219                         } else {
4220                                 flowlabel = inp->sctp_ep.default_flowlabel;
4221                         }
4222                         if (flowlabel == 0) {
4223                                 /*
4224                                  * This means especially, that it is not set
4225                                  * at the SCTP layer. So use the value from
4226                                  * the IP layer.
4227                                  */
4228                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4229                         }
4230                         flowlabel &= 0x000fffff;
4231                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4232                         if (port) {
4233                                 len += sizeof(struct udphdr);
4234                         }
4235                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4236                         if (newm == NULL) {
4237                                 sctp_m_freem(m);
4238                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4239                                 return (ENOMEM);
4240                         }
4241                         SCTP_ALIGN_TO_END(newm, len);
4242                         SCTP_BUF_LEN(newm) = len;
4243                         SCTP_BUF_NEXT(newm) = m;
4244                         m = newm;
4245                         if (net != NULL) {
4246 #ifdef INVARIANTS
4247                                 if (net->flowidset == 0) {
4248                                         panic("Flow ID not set");
4249                                 }
4250 #endif
4251                                 m->m_pkthdr.flowid = net->flowid;
4252                                 m->m_flags |= M_FLOWID;
4253                         } else {
4254                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
4255                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
4256                                         m->m_flags |= M_FLOWID;
4257                                 }
4258                         }
4259                         packet_length = sctp_calculate_len(m);
4260
4261                         ip6h = mtod(m, struct ip6_hdr *);
4262                         /* protect *sin6 from overwrite */
4263                         sin6 = (struct sockaddr_in6 *)to;
4264                         tmp = *sin6;
4265                         sin6 = &tmp;
4266
4267                         /* KAME hack: embed scopeid */
4268                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4269                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4270                                 return (EINVAL);
4271                         }
4272                         if (net == NULL) {
4273                                 memset(&ip6route, 0, sizeof(ip6route));
4274                                 ro = (sctp_route_t *) & ip6route;
4275                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4276                         } else {
4277                                 ro = (sctp_route_t *) & net->ro;
4278                         }
4279                         /*
4280                          * We assume here that inp_flow is in host byte
4281                          * order within the TCB!
4282                          */
4283                         if (tos_value == 0) {
4284                                 /*
4285                                  * This means especially, that it is not set
4286                                  * at the SCTP layer. So use the value from
4287                                  * the IP layer.
4288                                  */
4289                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4290                         }
4291                         tos_value &= 0xfc;
4292                         if (ecn_ok) {
4293                                 tos_value |= sctp_get_ect(stcb, chk);
4294                         }
4295                         flowinfo = 0x06;
4296                         flowinfo <<= 8;
4297                         flowinfo |= tos_value;
4298                         flowinfo <<= 20;
4299                         flowinfo |= flowlabel;
4300                         ip6h->ip6_flow = htonl(flowinfo);
4301                         if (port) {
4302                                 ip6h->ip6_nxt = IPPROTO_UDP;
4303                         } else {
4304                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4305                         }
4306                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4307                         ip6h->ip6_dst = sin6->sin6_addr;
4308
4309                         /*
4310                          * Add SRC address selection here: we can only reuse
4311                          * to a limited degree the kame src-addr-sel, since
4312                          * we can try their selection but it may not be
4313                          * bound.
4314                          */
4315                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4316                         lsa6_tmp.sin6_family = AF_INET6;
4317                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4318                         lsa6 = &lsa6_tmp;
4319                         if (net && out_of_asoc_ok == 0) {
4320                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4321                                         sctp_free_ifa(net->ro._s_addr);
4322                                         net->ro._s_addr = NULL;
4323                                         net->src_addr_selected = 0;
4324                                         if (ro->ro_rt) {
4325                                                 RTFREE(ro->ro_rt);
4326                                                 ro->ro_rt = NULL;
4327                                         }
4328                                 }
4329                                 if (net->src_addr_selected == 0) {
4330                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4331                                         /* KAME hack: embed scopeid */
4332                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4333                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4334                                                 return (EINVAL);
4335                                         }
4336                                         /* Cache the source address */
4337                                         net->ro._s_addr = sctp_source_address_selection(inp,
4338                                             stcb,
4339                                             ro,
4340                                             net,
4341                                             0,
4342                                             vrf_id);
4343                                         (void)sa6_recoverscope(sin6);
4344                                         net->src_addr_selected = 1;
4345                                 }
4346                                 if (net->ro._s_addr == NULL) {
4347                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4348                                         net->src_addr_selected = 0;
4349                                         sctp_handle_no_route(stcb, net, so_locked);
4350                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4351                                         sctp_m_freem(m);
4352                                         return (EHOSTUNREACH);
4353                                 }
4354                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4355                         } else {
4356                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4357                                 /* KAME hack: embed scopeid */
4358                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4359                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4360                                         return (EINVAL);
4361                                 }
4362                                 if (over_addr == NULL) {
4363                                         struct sctp_ifa *_lsrc;
4364
4365                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4366                                             net,
4367                                             out_of_asoc_ok,
4368                                             vrf_id);
4369                                         if (_lsrc == NULL) {
4370                                                 sctp_handle_no_route(stcb, net, so_locked);
4371                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4372                                                 sctp_m_freem(m);
4373                                                 return (EHOSTUNREACH);
4374                                         }
4375                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4376                                         sctp_free_ifa(_lsrc);
4377                                 } else {
4378                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4379                                         SCTP_RTALLOC(ro, vrf_id);
4380                                 }
4381                                 (void)sa6_recoverscope(sin6);
4382                         }
4383                         lsa6->sin6_port = inp->sctp_lport;
4384
4385                         if (ro->ro_rt == NULL) {
4386                                 /*
4387                                  * src addr selection failed to find a route
4388                                  * (or valid source addr), so we can't get
4389                                  * there from here!
4390                                  */
4391                                 sctp_handle_no_route(stcb, net, so_locked);
4392                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4393                                 sctp_m_freem(m);
4394                                 return (EHOSTUNREACH);
4395                         }
4396                         /*
4397                          * XXX: sa6 may not have a valid sin6_scope_id in
4398                          * the non-SCOPEDROUTING case.
4399                          */
4400                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4401                         lsa6_storage.sin6_family = AF_INET6;
4402                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4403                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4404                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4405                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4406                                 sctp_m_freem(m);
4407                                 return (error);
4408                         }
4409                         /* XXX */
4410                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4411                         lsa6_storage.sin6_port = inp->sctp_lport;
4412                         lsa6 = &lsa6_storage;
4413                         ip6h->ip6_src = lsa6->sin6_addr;
4414
4415                         if (port) {
4416                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4417                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4418                                 udp->uh_dport = port;
4419                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4420                                 udp->uh_sum = 0;
4421                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4422                         } else {
4423                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4424                         }
4425
4426                         sctphdr->src_port = src_port;
4427                         sctphdr->dest_port = dest_port;
4428                         sctphdr->v_tag = v_tag;
4429                         sctphdr->checksum = 0;
4430
4431                         /*
4432                          * We set the hop limit now since there is a good
4433                          * chance that our ro pointer is now filled
4434                          */
4435                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4436                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4437
4438 #ifdef SCTP_DEBUG
4439                         /* Copy to be sure something bad is not happening */
4440                         sin6->sin6_addr = ip6h->ip6_dst;
4441                         lsa6->sin6_addr = ip6h->ip6_src;
4442 #endif
4443
4444                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4445                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4446                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4447                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4448                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4449                         if (net) {
4450                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4451                                 /*
4452                                  * preserve the port and scope for link
4453                                  * local send
4454                                  */
4455                                 prev_scope = sin6->sin6_scope_id;
4456                                 prev_port = sin6->sin6_port;
4457                         }
4458                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4459                                 /* failed to prepend data, give up */
4460                                 sctp_m_freem(m);
4461                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4462                                 return (ENOMEM);
4463                         }
4464 #ifdef  SCTP_PACKET_LOGGING
4465                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4466                                 sctp_packet_log(m, packet_length);
4467 #endif
4468                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4469                         if (port) {
4470 #if defined(SCTP_WITH_NO_CSUM)
4471                                 SCTP_STAT_INCR(sctps_sendnocrc);
4472 #else
4473                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4474                                     (stcb) &&
4475                                     (stcb->asoc.loopback_scope))) {
4476                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4477                                         SCTP_STAT_INCR(sctps_sendswcrc);
4478                                 } else {
4479                                         SCTP_STAT_INCR(sctps_sendnocrc);
4480                                 }
4481 #endif
4482                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4483                                         udp->uh_sum = 0xffff;
4484                                 }
4485                         } else {
4486 #if defined(SCTP_WITH_NO_CSUM)
4487                                 SCTP_STAT_INCR(sctps_sendnocrc);
4488 #else
4489                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4490                                 m->m_pkthdr.csum_data = 0;
4491                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4492 #endif
4493                         }
4494                         /* send it out. table id is taken from stcb */
4495 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4496                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4497                                 so = SCTP_INP_SO(inp);
4498                                 SCTP_SOCKET_UNLOCK(so, 0);
4499                         }
4500 #endif
4501                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4502 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4503                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4504                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4505                                 SCTP_TCB_UNLOCK(stcb);
4506                                 SCTP_SOCKET_LOCK(so, 0);
4507                                 SCTP_TCB_LOCK(stcb);
4508                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4509                         }
4510 #endif
4511                         if (net) {
4512                                 /* for link local this must be done */
4513                                 sin6->sin6_scope_id = prev_scope;
4514                                 sin6->sin6_port = prev_port;
4515                         }
4516                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4517                         SCTP_STAT_INCR(sctps_sendpackets);
4518                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4519                         if (ret) {
4520                                 SCTP_STAT_INCR(sctps_senderrors);
4521                         }
4522                         if (net == NULL) {
4523                                 /* Now if we had a temp route free it */
4524                                 if (ro->ro_rt) {
4525                                         RTFREE(ro->ro_rt);
4526                                 }
4527                         } else {
4528                                 /*
4529                                  * PMTU check versus smallest asoc MTU goes
4530                                  * here
4531                                  */
4532                                 if (ro->ro_rt == NULL) {
4533                                         /* Route was freed */
4534                                         if (net->ro._s_addr &&
4535                                             net->src_addr_selected) {
4536                                                 sctp_free_ifa(net->ro._s_addr);
4537                                                 net->ro._s_addr = NULL;
4538                                         }
4539                                         net->src_addr_selected = 0;
4540                                 }
4541                                 if ((ro->ro_rt != NULL) &&
4542                                     (net->ro._s_addr)) {
4543                                         uint32_t mtu;
4544
4545                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4546                                         if (mtu &&
4547                                             (stcb->asoc.smallest_mtu > mtu)) {
4548                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4549                                                 net->mtu = mtu;
4550                                                 if (net->port) {
4551                                                         net->mtu -= sizeof(struct udphdr);
4552                                                 }
4553                                         }
4554                                 } else if (ifp) {
4555                                         if (ND_IFINFO(ifp)->linkmtu &&
4556                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4557                                                 sctp_mtu_size_reset(inp,
4558                                                     &stcb->asoc,
4559                                                     ND_IFINFO(ifp)->linkmtu);
4560                                         }
4561                                 }
4562                         }
4563                         return (ret);
4564                 }
4565 #endif
4566         default:
4567                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4568                     ((struct sockaddr *)to)->sa_family);
4569                 sctp_m_freem(m);
4570                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4571                 return (EFAULT);
4572         }
4573 }
4574
4575
4576 void
4577 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4578 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4579     SCTP_UNUSED
4580 #endif
4581 )
4582 {
4583         struct mbuf *m, *m_at, *mp_last;
4584         struct sctp_nets *net;
4585         struct sctp_init_chunk *init;
4586         struct sctp_supported_addr_param *sup_addr;
4587         struct sctp_adaptation_layer_indication *ali;
4588         struct sctp_ecn_supported_param *ecn;
4589         struct sctp_prsctp_supported_param *prsctp;
4590         struct sctp_supported_chunk_types_param *pr_supported;
4591         int cnt_inits_to = 0;
4592         int padval, ret;
4593         int num_ext;
4594         int p_len;
4595
4596         /* INIT's always go to the primary (and usually ONLY address) */
4597         mp_last = NULL;
4598         net = stcb->asoc.primary_destination;
4599         if (net == NULL) {
4600                 net = TAILQ_FIRST(&stcb->asoc.nets);
4601                 if (net == NULL) {
4602                         /* TSNH */
4603                         return;
4604                 }
4605                 /* we confirm any address we send an INIT to */
4606                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4607                 (void)sctp_set_primary_addr(stcb, NULL, net);
4608         } else {
4609                 /* we confirm any address we send an INIT to */
4610                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4611         }
4612         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4613 #ifdef INET6
4614         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4615                 /*
4616                  * special hook, if we are sending to link local it will not
4617                  * show up in our private address count.
4618                  */
4619                 struct sockaddr_in6 *sin6l;
4620
4621                 sin6l = &net->ro._l_addr.sin6;
4622                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4623                         cnt_inits_to = 1;
4624         }
4625 #endif
4626         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4627                 /* This case should not happen */
4628                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4629                 return;
4630         }
4631         /* start the INIT timer */
4632         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4633
4634         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4635         if (m == NULL) {
4636                 /* No memory, INIT timer will re-attempt. */
4637                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4638                 return;
4639         }
4640         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4641         /*
4642          * assume peer supports asconf in order to be able to queue local
4643          * address changes while an INIT is in flight and before the assoc
4644          * is established.
4645          */
4646         stcb->asoc.peer_supports_asconf = 1;
4647         /* Now lets put the SCTP header in place */
4648         init = mtod(m, struct sctp_init_chunk *);
4649         /* now the chunk header */
4650         init->ch.chunk_type = SCTP_INITIATION;
4651         init->ch.chunk_flags = 0;
4652         /* fill in later from mbuf we build */
4653         init->ch.chunk_length = 0;
4654         /* place in my tag */
4655         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4656         /* set up some of the credits. */
4657         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4658             SCTP_MINIMAL_RWND));
4659
4660         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4661         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4662         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4663         /* now the address restriction */
4664         /* XXX Should we take the address family of the socket into account? */
4665         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4666             sizeof(*init));
4667         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4668 #ifdef INET6
4669 #ifdef INET
4670         /* we support 2 types: IPv4/IPv6 */
4671         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
4672         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4673         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4674 #else
4675         /* we support 1 type: IPv6 */
4676         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4677         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4678         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4679 #endif
4680 #else
4681         /* we support 1 type: IPv4 */
4682         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
4683         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4684         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4685 #endif
4686         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
4687         /* adaptation layer indication parameter */
4688         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
4689         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4690         ali->ph.param_length = htons(sizeof(*ali));
4691         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4692         SCTP_BUF_LEN(m) += sizeof(*ali);
4693         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4694
4695         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4696                 /* Add NAT friendly parameter */
4697                 struct sctp_paramhdr *ph;
4698
4699                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4700                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4701                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4702                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4703                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4704         }
4705         /* now any cookie time extensions */
4706         if (stcb->asoc.cookie_preserve_req) {
4707                 struct sctp_cookie_perserve_param *cookie_preserve;
4708
4709                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4710                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4711                 cookie_preserve->ph.param_length = htons(
4712                     sizeof(*cookie_preserve));
4713                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4714                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4715                 ecn = (struct sctp_ecn_supported_param *)(
4716                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4717                 stcb->asoc.cookie_preserve_req = 0;
4718         }
4719         /* ECN parameter */
4720         if (stcb->asoc.ecn_allowed == 1) {
4721                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4722                 ecn->ph.param_length = htons(sizeof(*ecn));
4723                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4724                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4725                     sizeof(*ecn));
4726         } else {
4727                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4728         }
4729         /* And now tell the peer we do pr-sctp */
4730         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4731         prsctp->ph.param_length = htons(sizeof(*prsctp));
4732         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4733
4734         /* And now tell the peer we do all the extensions */
4735         pr_supported = (struct sctp_supported_chunk_types_param *)
4736             ((caddr_t)prsctp + sizeof(*prsctp));
4737         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4738         num_ext = 0;
4739         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4740         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4741         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4742         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4743         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4744         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4745                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4746         }
4747         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4748                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4749         }
4750         p_len = sizeof(*pr_supported) + num_ext;
4751         pr_supported->ph.param_length = htons(p_len);
4752         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4753         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4754
4755
4756         /* add authentication parameters */
4757         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4758                 struct sctp_auth_random *randp;
4759                 struct sctp_auth_hmac_algo *hmacs;
4760                 struct sctp_auth_chunk_list *chunks;
4761
4762                 /* attach RANDOM parameter, if available */
4763                 if (stcb->asoc.authinfo.random != NULL) {
4764                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4765                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4766                         /* random key already contains the header */
4767                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4768                         /* zero out any padding required */
4769                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4770                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4771                 }
4772                 /* add HMAC_ALGO parameter */
4773                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4774                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4775                     (uint8_t *) hmacs->hmac_ids);
4776                 if (p_len > 0) {
4777                         p_len += sizeof(*hmacs);
4778                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4779                         hmacs->ph.param_length = htons(p_len);
4780                         /* zero out any padding required */
4781                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4782                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4783                 }
4784                 /* add CHUNKS parameter */
4785                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4786                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4787                     chunks->chunk_types);
4788                 if (p_len > 0) {
4789                         p_len += sizeof(*chunks);
4790                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4791                         chunks->ph.param_length = htons(p_len);
4792                         /* zero out any padding required */
4793                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4794                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4795                 }
4796         }
4797         m_at = m;
4798         /* now the addresses */
4799         {
4800                 struct sctp_scoping scp;
4801
4802                 /*
4803                  * To optimize this we could put the scoping stuff into a
4804                  * structure and remove the individual uint8's from the
4805                  * assoc structure. Then we could just sifa in the address
4806                  * within the stcb.. but for now this is a quick hack to get
4807                  * the address stuff teased apart.
4808                  */
4809                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4810                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4811                 scp.loopback_scope = stcb->asoc.loopback_scope;
4812                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4813                 scp.local_scope = stcb->asoc.local_scope;
4814                 scp.site_scope = stcb->asoc.site_scope;
4815
4816                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
4817         }
4818
4819         /* calulate the size and update pkt header and chunk header */
4820         p_len = 0;
4821         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4822                 if (SCTP_BUF_NEXT(m_at) == NULL)
4823                         mp_last = m_at;
4824                 p_len += SCTP_BUF_LEN(m_at);
4825         }
4826         init->ch.chunk_length = htons(p_len);
4827         /*
4828          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4829          * here since the timer will drive a retranmission.
4830          */
4831
4832         /* I don't expect this to execute but we will be safe here */
4833         padval = p_len % 4;
4834         if ((padval) && (mp_last)) {
4835                 /*
4836                  * The compiler worries that mp_last may not be set even
4837                  * though I think it is impossible :-> however we add
4838                  * mp_last here just in case.
4839                  */
4840                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4841                 if (ret) {
4842                         /* Houston we have a problem, no space */
4843                         sctp_m_freem(m);
4844                         return;
4845                 }
4846                 p_len += padval;
4847         }
4848         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4849         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4850             (struct sockaddr *)&net->ro._l_addr,
4851             m, 0, NULL, 0, 0, 0, NULL, 0,
4852             inp->sctp_lport, stcb->rport, htonl(0),
4853             net->port, so_locked, NULL, NULL);
4854         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4855         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4856         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4857 }
4858
4859 struct mbuf *
4860 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4861     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4862 {
4863         /*
4864          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4865          * being equal to the beginning of the params i.e. (iphlen +
4866          * sizeof(struct sctp_init_msg) parse through the parameters to the
4867          * end of the mbuf verifying that all parameters are known.
4868          *
4869          * For unknown parameters build and return a mbuf with
4870          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4871          * processing this chunk stop, and set *abort_processing to 1.
4872          *
4873          * By having param_offset be pre-set to where parameters begin it is
4874          * hoped that this routine may be reused in the future by new
4875          * features.
4876          */
4877         struct sctp_paramhdr *phdr, params;
4878
4879         struct mbuf *mat, *op_err;
4880         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4881         int at, limit, pad_needed;
4882         uint16_t ptype, plen, padded_size;
4883         int err_at;
4884
4885         *abort_processing = 0;
4886         mat = in_initpkt;
4887         err_at = 0;
4888         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4889         at = param_offset;
4890         op_err = NULL;
4891         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4892         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4893         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4894                 ptype = ntohs(phdr->param_type);
4895                 plen = ntohs(phdr->param_length);
4896                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4897                         /* wacked parameter */
4898                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4899                         goto invalid_size;
4900                 }
4901                 limit -= SCTP_SIZE32(plen);
4902                 /*-
4903                  * All parameters for all chunks that we know/understand are
4904                  * listed here. We process them other places and make
4905                  * appropriate stop actions per the upper bits. However this
4906                  * is the generic routine processor's can call to get back
4907                  * an operr.. to either incorporate (init-ack) or send.
4908                  */
4909                 padded_size = SCTP_SIZE32(plen);
4910                 switch (ptype) {
4911                         /* Param's with variable size */
4912                 case SCTP_HEARTBEAT_INFO:
4913                 case SCTP_STATE_COOKIE:
4914                 case SCTP_UNRECOG_PARAM:
4915                 case SCTP_ERROR_CAUSE_IND:
4916                         /* ok skip fwd */
4917                         at += padded_size;
4918                         break;
4919                         /* Param's with variable size within a range */
4920                 case SCTP_CHUNK_LIST:
4921                 case SCTP_SUPPORTED_CHUNK_EXT:
4922                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4923                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4924                                 goto invalid_size;
4925                         }
4926                         at += padded_size;
4927                         break;
4928                 case SCTP_SUPPORTED_ADDRTYPE:
4929                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4930                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4931                                 goto invalid_size;
4932                         }
4933                         at += padded_size;
4934                         break;
4935                 case SCTP_RANDOM:
4936                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4937                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4938                                 goto invalid_size;
4939                         }
4940                         at += padded_size;
4941                         break;
4942                 case SCTP_SET_PRIM_ADDR:
4943                 case SCTP_DEL_IP_ADDRESS:
4944                 case SCTP_ADD_IP_ADDRESS:
4945                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4946                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4947                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4948                                 goto invalid_size;
4949                         }
4950                         at += padded_size;
4951                         break;
4952                         /* Param's with a fixed size */
4953                 case SCTP_IPV4_ADDRESS:
4954                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4955                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4956                                 goto invalid_size;
4957                         }
4958                         at += padded_size;
4959                         break;
4960                 case SCTP_IPV6_ADDRESS:
4961                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4962                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4963                                 goto invalid_size;
4964                         }
4965                         at += padded_size;
4966                         break;
4967                 case SCTP_COOKIE_PRESERVE:
4968                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4969                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4970                                 goto invalid_size;
4971                         }
4972                         at += padded_size;
4973                         break;
4974                 case SCTP_HAS_NAT_SUPPORT:
4975                         *nat_friendly = 1;
4976                         /* fall through */
4977                 case SCTP_PRSCTP_SUPPORTED:
4978
4979                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4981                                 goto invalid_size;
4982                         }
4983                         at += padded_size;
4984                         break;
4985                 case SCTP_ECN_CAPABLE:
4986                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4988                                 goto invalid_size;
4989                         }
4990                         at += padded_size;
4991                         break;
4992                 case SCTP_ULP_ADAPTATION:
4993                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4994                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4995                                 goto invalid_size;
4996                         }
4997                         at += padded_size;
4998                         break;
4999                 case SCTP_SUCCESS_REPORT:
5000                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5001                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5002                                 goto invalid_size;
5003                         }
5004                         at += padded_size;
5005                         break;
5006                 case SCTP_HOSTNAME_ADDRESS:
5007                         {
5008                                 /* We can NOT handle HOST NAME addresses!! */
5009                                 int l_len;
5010
5011                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5012                                 *abort_processing = 1;
5013                                 if (op_err == NULL) {
5014                                         /* Ok need to try to get a mbuf */
5015 #ifdef INET6
5016                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5017 #else
5018                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5019 #endif
5020                                         l_len += plen;
5021                                         l_len += sizeof(struct sctp_paramhdr);
5022                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5023                                         if (op_err) {
5024                                                 SCTP_BUF_LEN(op_err) = 0;
5025                                                 /*
5026                                                  * pre-reserve space for ip
5027                                                  * and sctp header  and
5028                                                  * chunk hdr
5029                                                  */
5030 #ifdef INET6
5031                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5032 #else
5033                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5034 #endif
5035                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5036                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5037                                         }
5038                                 }
5039                                 if (op_err) {
5040                                         /* If we have space */
5041                                         struct sctp_paramhdr s;
5042
5043                                         if (err_at % 4) {
5044                                                 uint32_t cpthis = 0;
5045
5046                                                 pad_needed = 4 - (err_at % 4);
5047                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5048                                                 err_at += pad_needed;
5049                                         }
5050                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5051                                         s.param_length = htons(sizeof(s) + plen);
5052                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5053                                         err_at += sizeof(s);
5054                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5055                                         if (phdr == NULL) {
5056                                                 sctp_m_freem(op_err);
5057                                                 /*
5058                                                  * we are out of memory but
5059                                                  * we still need to have a
5060                                                  * look at what to do (the
5061                                                  * system is in trouble
5062                                                  * though).
5063                                                  */
5064                                                 return (NULL);
5065                                         }
5066                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5067                                         err_at += plen;
5068                                 }
5069                                 return (op_err);
5070                                 break;
5071                         }
5072                 default:
5073                         /*
5074                          * we do not recognize the parameter figure out what
5075                          * we do.
5076                          */
5077                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5078                         if ((ptype & 0x4000) == 0x4000) {
5079                                 /* Report bit is set?? */
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5081                                 if (op_err == NULL) {
5082                                         int l_len;
5083
5084                                         /* Ok need to try to get an mbuf */
5085 #ifdef INET6
5086                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5087 #else
5088                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5089 #endif
5090                                         l_len += plen;
5091                                         l_len += sizeof(struct sctp_paramhdr);
5092                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5093                                         if (op_err) {
5094                                                 SCTP_BUF_LEN(op_err) = 0;
5095 #ifdef INET6
5096                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5097 #else
5098                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5099 #endif
5100                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5101                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5102                                         }
5103                                 }
5104                                 if (op_err) {
5105                                         /* If we have space */
5106                                         struct sctp_paramhdr s;
5107
5108                                         if (err_at % 4) {
5109                                                 uint32_t cpthis = 0;
5110
5111                                                 pad_needed = 4 - (err_at % 4);
5112                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5113                                                 err_at += pad_needed;
5114                                         }
5115                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5116                                         s.param_length = htons(sizeof(s) + plen);
5117                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5118                                         err_at += sizeof(s);
5119                                         if (plen > sizeof(tempbuf)) {
5120                                                 plen = sizeof(tempbuf);
5121                                         }
5122                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5123                                         if (phdr == NULL) {
5124                                                 sctp_m_freem(op_err);
5125                                                 /*
5126                                                  * we are out of memory but
5127                                                  * we still need to have a
5128                                                  * look at what to do (the
5129                                                  * system is in trouble
5130                                                  * though).
5131                                                  */
5132                                                 op_err = NULL;
5133                                                 goto more_processing;
5134                                         }
5135                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5136                                         err_at += plen;
5137                                 }
5138                         }
5139         more_processing:
5140                         if ((ptype & 0x8000) == 0x0000) {
5141                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5142                                 return (op_err);
5143                         } else {
5144                                 /* skip this chunk and continue processing */
5145                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5146                                 at += SCTP_SIZE32(plen);
5147                         }
5148                         break;
5149
5150                 }
5151                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5152         }
5153         return (op_err);
5154 invalid_size:
5155         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5156         *abort_processing = 1;
5157         if ((op_err == NULL) && phdr) {
5158                 int l_len;
5159
5160 #ifdef INET6
5161                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5162 #else
5163                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5164 #endif
5165                 l_len += (2 * sizeof(struct sctp_paramhdr));
5166                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5167                 if (op_err) {
5168                         SCTP_BUF_LEN(op_err) = 0;
5169 #ifdef INET6
5170                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5171 #else
5172                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5173 #endif
5174                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5175                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5176                 }
5177         }
5178         if ((op_err) && phdr) {
5179                 struct sctp_paramhdr s;
5180
5181                 if (err_at % 4) {
5182                         uint32_t cpthis = 0;
5183
5184                         pad_needed = 4 - (err_at % 4);
5185                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5186                         err_at += pad_needed;
5187                 }
5188                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5189                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5190                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5191                 err_at += sizeof(s);
5192                 /* Only copy back the p-hdr that caused the issue */
5193                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5194         }
5195         return (op_err);
5196 }
5197
5198 static int
5199 sctp_are_there_new_addresses(struct sctp_association *asoc,
5200     struct mbuf *in_initpkt, int iphlen, int offset)
5201 {
5202         /*
5203          * Given a INIT packet, look through the packet to verify that there
5204          * are NO new addresses. As we go through the parameters add reports
5205          * of any un-understood parameters that require an error.  Also we
5206          * must return (1) to drop the packet if we see a un-understood
5207          * parameter that tells us to drop the chunk.
5208          */
5209         struct sockaddr *sa_touse;
5210         struct sockaddr *sa;
5211         struct sctp_paramhdr *phdr, params;
5212         uint16_t ptype, plen;
5213         uint8_t fnd;
5214         struct sctp_nets *net;
5215         struct ip *iph;
5216
5217 #ifdef INET
5218         struct sockaddr_in sin4, *sa4;
5219
5220 #endif
5221 #ifdef INET6
5222         struct sockaddr_in6 sin6, *sa6;
5223         struct ip6_hdr *ip6h;
5224
5225 #endif
5226
5227 #ifdef INET
5228         memset(&sin4, 0, sizeof(sin4));
5229         sin4.sin_family = AF_INET;
5230         sin4.sin_len = sizeof(sin4);
5231 #endif
5232 #ifdef INET6
5233         memset(&sin6, 0, sizeof(sin6));
5234         sin6.sin6_family = AF_INET6;
5235         sin6.sin6_len = sizeof(sin6);
5236 #endif
5237         sa_touse = NULL;
5238         /* First what about the src address of the pkt ? */
5239         iph = mtod(in_initpkt, struct ip *);
5240         switch (iph->ip_v) {
5241 #ifdef INET
5242         case IPVERSION:
5243                 /* source addr is IPv4 */
5244                 sin4.sin_addr = iph->ip_src;
5245                 sa_touse = (struct sockaddr *)&sin4;
5246                 break;
5247 #endif
5248 #ifdef INET6
5249         case IPV6_VERSION >> 4:
5250                 /* source addr is IPv6 */
5251                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5252                 sin6.sin6_addr = ip6h->ip6_src;
5253                 sa_touse = (struct sockaddr *)&sin6;
5254                 break;
5255 #endif
5256         default:
5257                 return (1);
5258         }
5259
5260         fnd = 0;
5261         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5262                 sa = (struct sockaddr *)&net->ro._l_addr;
5263                 if (sa->sa_family == sa_touse->sa_family) {
5264 #ifdef INET
5265                         if (sa->sa_family == AF_INET) {
5266                                 sa4 = (struct sockaddr_in *)sa;
5267                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5268                                         fnd = 1;
5269                                         break;
5270                                 }
5271                         }
5272 #endif
5273 #ifdef INET6
5274                         if (sa->sa_family == AF_INET6) {
5275                                 sa6 = (struct sockaddr_in6 *)sa;
5276                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5277                                         fnd = 1;
5278                                         break;
5279                                 }
5280                         }
5281 #endif
5282                 }
5283         }
5284         if (fnd == 0) {
5285                 /* New address added! no need to look futher. */
5286                 return (1);
5287         }
5288         /* Ok so far lets munge through the rest of the packet */
5289         offset += sizeof(struct sctp_init_chunk);
5290         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5291         while (phdr) {
5292                 sa_touse = NULL;
5293                 ptype = ntohs(phdr->param_type);
5294                 plen = ntohs(phdr->param_length);
5295                 switch (ptype) {
5296 #ifdef INET
5297                 case SCTP_IPV4_ADDRESS:
5298                         {
5299                                 struct sctp_ipv4addr_param *p4, p4_buf;
5300
5301                                 phdr = sctp_get_next_param(in_initpkt, offset,
5302                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5303                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5304                                     phdr == NULL) {
5305                                         return (1);
5306                                 }
5307                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5308                                 sin4.sin_addr.s_addr = p4->addr;
5309                                 sa_touse = (struct sockaddr *)&sin4;
5310                         }
5311 #endif
5312 #ifdef INET6
5313                 case SCTP_IPV6_ADDRESS:
5314                         {
5315                                 struct sctp_ipv6addr_param *p6, p6_buf;
5316
5317                                 phdr = sctp_get_next_param(in_initpkt, offset,
5318                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5319                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5320                                     phdr == NULL) {
5321                                         return (1);
5322                                 }
5323                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5324                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5325                                     sizeof(p6->addr));
5326                                 sa_touse = (struct sockaddr *)&sin6;
5327                         }
5328 #endif
5329                 default:
5330                         sa_touse = NULL;
5331                 }
5332                 if (sa_touse) {
5333                         /* ok, sa_touse points to one to check */
5334                         fnd = 0;
5335                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5336                                 sa = (struct sockaddr *)&net->ro._l_addr;
5337                                 if (sa->sa_family != sa_touse->sa_family) {
5338                                         continue;
5339                                 }
5340 #ifdef INET
5341                                 if (sa->sa_family == AF_INET) {
5342                                         sa4 = (struct sockaddr_in *)sa;
5343                                         if (sa4->sin_addr.s_addr ==
5344                                             sin4.sin_addr.s_addr) {
5345                                                 fnd = 1;
5346                                                 break;
5347                                         }
5348                                 }
5349 #endif
5350 #ifdef INET6
5351                                 if (sa->sa_family == AF_INET6) {
5352                                         sa6 = (struct sockaddr_in6 *)sa;
5353                                         if (SCTP6_ARE_ADDR_EQUAL(
5354                                             sa6, &sin6)) {
5355                                                 fnd = 1;
5356                                                 break;
5357                                         }
5358                                 }
5359 #endif
5360                         }
5361                         if (!fnd) {
5362                                 /* New addr added! no need to look further */
5363                                 return (1);
5364                         }
5365                 }
5366                 offset += SCTP_SIZE32(plen);
5367                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5368         }
5369         return (0);
5370 }
5371
5372 /*
5373  * Given a MBUF chain that was sent into us containing an INIT. Build a
5374  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5375  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5376  * message (i.e. the struct sctp_init_msg).
5377  */
5378 void
5379 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5380     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
5381     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5382 {
5383         struct sctp_association *asoc;
5384         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5385         struct sctp_init_ack_chunk *initack;
5386         struct sctp_adaptation_layer_indication *ali;
5387         struct sctp_ecn_supported_param *ecn;
5388         struct sctp_prsctp_supported_param *prsctp;
5389         struct sctp_supported_chunk_types_param *pr_supported;
5390         union sctp_sockstore store, store1, *over_addr;
5391
5392 #ifdef INET
5393         struct sockaddr_in *sin, *to_sin;
5394
5395 #endif
5396 #ifdef INET6
5397         struct sockaddr_in6 *sin6, *to_sin6;
5398
5399 #endif
5400         struct ip *iph;
5401
5402 #ifdef INET6
5403         struct ip6_hdr *ip6;
5404
5405 #endif
5406         struct sockaddr *to;
5407         struct sctp_state_cookie stc;
5408         struct sctp_nets *net = NULL;
5409         uint8_t *signature = NULL;
5410         int cnt_inits_to = 0;
5411         uint16_t his_limit, i_want;
5412         int abort_flag, padval;
5413         int num_ext;
5414         int p_len;
5415         int nat_friendly = 0;
5416         struct socket *so;
5417
5418         if (stcb)
5419                 asoc = &stcb->asoc;
5420         else
5421                 asoc = NULL;
5422         mp_last = NULL;
5423         if ((asoc != NULL) &&
5424             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5425             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
5426                 /* new addresses, out of here in non-cookie-wait states */
5427                 /*
5428                  * Send a ABORT, we don't add the new address error clause
5429                  * though we even set the T bit and copy in the 0 tag.. this
5430                  * looks no different than if no listener was present.
5431                  */
5432                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5433                 return;
5434         }
5435         abort_flag = 0;
5436         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5437             (offset + sizeof(struct sctp_init_chunk)),
5438             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5439         if (abort_flag) {
5440 do_a_abort:
5441                 sctp_send_abort(init_pkt, iphlen, sh,
5442                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5443                 return;
5444         }
5445         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5446         if (m == NULL) {
5447                 /* No memory, INIT timer will re-attempt. */
5448                 if (op_err)
5449                         sctp_m_freem(op_err);
5450                 return;
5451         }
5452         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5453
5454         /* the time I built cookie */
5455         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5456
5457         /* populate any tie tags */
5458         if (asoc != NULL) {
5459                 /* unlock before tag selections */
5460                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5461                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5462                 stc.cookie_life = asoc->cookie_life;
5463                 net = asoc->primary_destination;
5464         } else {
5465                 stc.tie_tag_my_vtag = 0;
5466                 stc.tie_tag_peer_vtag = 0;
5467                 /* life I will award this cookie */
5468                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5469         }
5470
5471         /* copy in the ports for later check */
5472         stc.myport = sh->dest_port;
5473         stc.peerport = sh->src_port;
5474
5475         /*
5476          * If we wanted to honor cookie life extentions, we would add to
5477          * stc.cookie_life. For now we should NOT honor any extension
5478          */
5479         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5480         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5481                 struct inpcb *in_inp;
5482
5483                 /* Its a V6 socket */
5484                 in_inp = (struct inpcb *)inp;
5485                 stc.ipv6_addr_legal = 1;
5486                 /* Now look at the binding flag to see if V4 will be legal */
5487                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5488                         stc.ipv4_addr_legal = 1;
5489                 } else {
5490                         /* V4 addresses are NOT legal on the association */
5491                         stc.ipv4_addr_legal = 0;
5492                 }
5493         } else {
5494                 /* Its a V4 socket, no - V6 */
5495                 stc.ipv4_addr_legal = 1;
5496                 stc.ipv6_addr_legal = 0;
5497         }
5498
5499 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5500         stc.ipv4_scope = 1;
5501 #else
5502         stc.ipv4_scope = 0;
5503 #endif
5504         /* now for scope setup */
5505         memset((caddr_t)&store, 0, sizeof(store));
5506         memset((caddr_t)&store1, 0, sizeof(store1));
5507 #ifdef INET
5508         sin = &store.sin;
5509         to_sin = &store1.sin;
5510 #endif
5511 #ifdef INET6
5512         sin6 = &store.sin6;
5513         to_sin6 = &store1.sin6;
5514 #endif
5515         iph = mtod(init_pkt, struct ip *);
5516         /* establish the to_addr's */
5517         switch (iph->ip_v) {
5518 #ifdef INET
5519         case IPVERSION:
5520                 to_sin->sin_port = sh->dest_port;
5521                 to_sin->sin_family = AF_INET;
5522                 to_sin->sin_len = sizeof(struct sockaddr_in);
5523                 to_sin->sin_addr = iph->ip_dst;
5524                 break;
5525 #endif
5526 #ifdef INET6
5527         case IPV6_VERSION >> 4:
5528                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5529                 to_sin6->sin6_addr = ip6->ip6_dst;
5530                 to_sin6->sin6_scope_id = 0;
5531                 to_sin6->sin6_port = sh->dest_port;
5532                 to_sin6->sin6_family = AF_INET6;
5533                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5534                 break;
5535 #endif
5536         default:
5537                 goto do_a_abort;
5538                 break;
5539         };
5540
5541         if (net == NULL) {
5542                 to = (struct sockaddr *)&store;
5543                 switch (iph->ip_v) {
5544 #ifdef INET
5545                 case IPVERSION:
5546                         {
5547                                 sin->sin_family = AF_INET;
5548                                 sin->sin_len = sizeof(struct sockaddr_in);
5549                                 sin->sin_port = sh->src_port;
5550                                 sin->sin_addr = iph->ip_src;
5551                                 /* lookup address */
5552                                 stc.address[0] = sin->sin_addr.s_addr;
5553                                 stc.address[1] = 0;
5554                                 stc.address[2] = 0;
5555                                 stc.address[3] = 0;
5556                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5557                                 /* local from address */
5558                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5559                                 stc.laddress[1] = 0;
5560                                 stc.laddress[2] = 0;
5561                                 stc.laddress[3] = 0;
5562                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5563                                 /* scope_id is only for v6 */
5564                                 stc.scope_id = 0;
5565 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5566                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5567                                         stc.ipv4_scope = 1;
5568                                 }
5569 #else
5570                                 stc.ipv4_scope = 1;
5571 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5572                                 /* Must use the address in this case */
5573                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5574                                         stc.loopback_scope = 1;
5575                                         stc.ipv4_scope = 1;
5576                                         stc.site_scope = 1;
5577                                         stc.local_scope = 0;
5578                                 }
5579                                 break;
5580                         }
5581 #endif
5582 #ifdef INET6
5583                 case IPV6_VERSION >> 4:
5584                         {
5585                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5586                                 sin6->sin6_family = AF_INET6;
5587                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5588                                 sin6->sin6_port = sh->src_port;
5589                                 sin6->sin6_addr = ip6->ip6_src;
5590                                 /* lookup address */
5591                                 memcpy(&stc.address, &sin6->sin6_addr,
5592                                     sizeof(struct in6_addr));
5593                                 sin6->sin6_scope_id = 0;
5594                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5595                                 stc.scope_id = 0;
5596                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5597                                         /*
5598                                          * FIX ME: does this have scope from
5599                                          * rcvif?
5600                                          */
5601                                         (void)sa6_recoverscope(sin6);
5602                                         stc.scope_id = sin6->sin6_scope_id;
5603                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5604                                         stc.loopback_scope = 1;
5605                                         stc.local_scope = 0;
5606                                         stc.site_scope = 1;
5607                                         stc.ipv4_scope = 1;
5608                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5609                                         /*
5610                                          * If the new destination is a
5611                                          * LINK_LOCAL we must have common
5612                                          * both site and local scope. Don't
5613                                          * set local scope though since we
5614                                          * must depend on the source to be
5615                                          * added implicitly. We cannot
5616                                          * assure just because we share one
5617                                          * link that all links are common.
5618                                          */
5619                                         stc.local_scope = 0;
5620                                         stc.site_scope = 1;
5621                                         stc.ipv4_scope = 1;
5622                                         /*
5623                                          * we start counting for the private
5624                                          * address stuff at 1. since the
5625                                          * link local we source from won't
5626                                          * show up in our scoped count.
5627                                          */
5628                                         cnt_inits_to = 1;
5629                                         /*
5630                                          * pull out the scope_id from
5631                                          * incoming pkt
5632                                          */
5633                                         /*
5634                                          * FIX ME: does this have scope from
5635                                          * rcvif?
5636                                          */
5637                                         (void)sa6_recoverscope(sin6);
5638                                         stc.scope_id = sin6->sin6_scope_id;
5639                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5640                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5641                                         /*
5642                                          * If the new destination is
5643                                          * SITE_LOCAL then we must have site
5644                                          * scope in common.
5645                                          */
5646                                         stc.site_scope = 1;
5647                                 }
5648                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5649                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5650                                 break;
5651                         }
5652 #endif
5653                 default:
5654                         /* TSNH */
5655                         goto do_a_abort;
5656                         break;
5657                 }
5658         } else {
5659                 /* set the scope per the existing tcb */
5660
5661 #ifdef INET6
5662                 struct sctp_nets *lnet;
5663
5664 #endif
5665
5666                 stc.loopback_scope = asoc->loopback_scope;
5667                 stc.ipv4_scope = asoc->ipv4_local_scope;
5668                 stc.site_scope = asoc->site_scope;
5669                 stc.local_scope = asoc->local_scope;
5670 #ifdef INET6
5671                 /* Why do we not consider IPv4 LL addresses? */
5672                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5673                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5674                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5675                                         /*
5676                                          * if we have a LL address, start
5677                                          * counting at 1.
5678                                          */
5679                                         cnt_inits_to = 1;
5680                                 }
5681                         }
5682                 }
5683 #endif
5684                 /* use the net pointer */
5685                 to = (struct sockaddr *)&net->ro._l_addr;
5686                 switch (to->sa_family) {
5687 #ifdef INET
5688                 case AF_INET:
5689                         sin = (struct sockaddr_in *)to;
5690                         stc.address[0] = sin->sin_addr.s_addr;
5691                         stc.address[1] = 0;
5692                         stc.address[2] = 0;
5693                         stc.address[3] = 0;
5694                         stc.addr_type = SCTP_IPV4_ADDRESS;
5695                         if (net->src_addr_selected == 0) {
5696                                 /*
5697                                  * strange case here, the INIT should have
5698                                  * did the selection.
5699                                  */
5700                                 net->ro._s_addr = sctp_source_address_selection(inp,
5701                                     stcb, (sctp_route_t *) & net->ro,
5702                                     net, 0, vrf_id);
5703                                 if (net->ro._s_addr == NULL)
5704                                         return;
5705
5706                                 net->src_addr_selected = 1;
5707
5708                         }
5709                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5710                         stc.laddress[1] = 0;
5711                         stc.laddress[2] = 0;
5712                         stc.laddress[3] = 0;
5713                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5714                         break;
5715 #endif
5716 #ifdef INET6
5717                 case AF_INET6:
5718                         sin6 = (struct sockaddr_in6 *)to;
5719                         memcpy(&stc.address, &sin6->sin6_addr,
5720                             sizeof(struct in6_addr));
5721                         stc.addr_type = SCTP_IPV6_ADDRESS;
5722                         if (net->src_addr_selected == 0) {
5723                                 /*
5724                                  * strange case here, the INIT should have
5725                                  * did the selection.
5726                                  */
5727                                 net->ro._s_addr = sctp_source_address_selection(inp,
5728                                     stcb, (sctp_route_t *) & net->ro,
5729                                     net, 0, vrf_id);
5730                                 if (net->ro._s_addr == NULL)
5731                                         return;
5732
5733                                 net->src_addr_selected = 1;
5734                         }
5735                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5736                             sizeof(struct in6_addr));
5737                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5738                         break;
5739 #endif
5740                 }
5741         }
5742         /* Now lets put the SCTP header in place */
5743         initack = mtod(m, struct sctp_init_ack_chunk *);
5744         /* Save it off for quick ref */
5745         stc.peers_vtag = init_chk->init.initiate_tag;
5746         /* who are we */
5747         memcpy(stc.identification, SCTP_VERSION_STRING,
5748             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5749         /* now the chunk header */
5750         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5751         initack->ch.chunk_flags = 0;
5752         /* fill in later from mbuf we build */
5753         initack->ch.chunk_length = 0;
5754         /* place in my tag */
5755         if ((asoc != NULL) &&
5756             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5757             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5758             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5759                 /* re-use the v-tags and init-seq here */
5760                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5761                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5762         } else {
5763                 uint32_t vtag, itsn;
5764
5765                 if (hold_inp_lock) {
5766                         SCTP_INP_INCR_REF(inp);
5767                         SCTP_INP_RUNLOCK(inp);
5768                 }
5769                 if (asoc) {
5770                         atomic_add_int(&asoc->refcnt, 1);
5771                         SCTP_TCB_UNLOCK(stcb);
5772         new_tag:
5773                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5774                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5775                                 /*
5776                                  * Got a duplicate vtag on some guy behind a
5777                                  * nat make sure we don't use it.
5778                                  */
5779                                 goto new_tag;
5780                         }
5781                         initack->init.initiate_tag = htonl(vtag);
5782                         /* get a TSN to use too */
5783                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5784                         initack->init.initial_tsn = htonl(itsn);
5785                         SCTP_TCB_LOCK(stcb);
5786                         atomic_add_int(&asoc->refcnt, -1);
5787                 } else {
5788                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5789                         initack->init.initiate_tag = htonl(vtag);
5790                         /* get a TSN to use too */
5791                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5792                 }
5793                 if (hold_inp_lock) {
5794                         SCTP_INP_RLOCK(inp);
5795                         SCTP_INP_DECR_REF(inp);
5796                 }
5797         }
5798         /* save away my tag to */
5799         stc.my_vtag = initack->init.initiate_tag;
5800
5801         /* set up some of the credits. */
5802         so = inp->sctp_socket;
5803         if (so == NULL) {
5804                 /* memory problem */
5805                 sctp_m_freem(m);
5806                 return;
5807         } else {
5808                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5809         }
5810         /* set what I want */
5811         his_limit = ntohs(init_chk->init.num_inbound_streams);
5812         /* choose what I want */
5813         if (asoc != NULL) {
5814                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5815                         i_want = asoc->streamoutcnt;
5816                 } else {
5817                         i_want = inp->sctp_ep.pre_open_stream_count;
5818                 }
5819         } else {
5820                 i_want = inp->sctp_ep.pre_open_stream_count;
5821         }
5822         if (his_limit < i_want) {
5823                 /* I Want more :< */
5824                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5825         } else {
5826                 /* I can have what I want :> */
5827                 initack->init.num_outbound_streams = htons(i_want);
5828         }
5829         /* tell him his limt. */
5830         initack->init.num_inbound_streams =
5831             htons(inp->sctp_ep.max_open_streams_intome);
5832
5833         /* adaptation layer indication parameter */
5834         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5835         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5836         ali->ph.param_length = htons(sizeof(*ali));
5837         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5838         SCTP_BUF_LEN(m) += sizeof(*ali);
5839         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5840
5841         /* ECN parameter */
5842         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5843             (inp->sctp_ecn_enable == 1)) {
5844                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5845                 ecn->ph.param_length = htons(sizeof(*ecn));
5846                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5847
5848                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5849                     sizeof(*ecn));
5850         } else {
5851                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5852         }
5853         /* And now tell the peer we do  pr-sctp */
5854         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5855         prsctp->ph.param_length = htons(sizeof(*prsctp));
5856         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5857         if (nat_friendly) {
5858                 /* Add NAT friendly parameter */
5859                 struct sctp_paramhdr *ph;
5860
5861                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5862                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5863                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5864                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5865         }
5866         /* And now tell the peer we do all the extensions */
5867         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5868         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5869         num_ext = 0;
5870         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5871         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5872         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5873         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5874         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5875         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5876                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5877         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5878                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5879         p_len = sizeof(*pr_supported) + num_ext;
5880         pr_supported->ph.param_length = htons(p_len);
5881         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5882         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5883
5884         /* add authentication parameters */
5885         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5886                 struct sctp_auth_random *randp;
5887                 struct sctp_auth_hmac_algo *hmacs;
5888                 struct sctp_auth_chunk_list *chunks;
5889                 uint16_t random_len;
5890
5891                 /* generate and add RANDOM parameter */
5892                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5893                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5894                 randp->ph.param_type = htons(SCTP_RANDOM);
5895                 p_len = sizeof(*randp) + random_len;
5896                 randp->ph.param_length = htons(p_len);
5897                 SCTP_READ_RANDOM(randp->random_data, random_len);
5898                 /* zero out any padding required */
5899                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5900                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5901
5902                 /* add HMAC_ALGO parameter */
5903                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5904                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5905                     (uint8_t *) hmacs->hmac_ids);
5906                 if (p_len > 0) {
5907                         p_len += sizeof(*hmacs);
5908                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5909                         hmacs->ph.param_length = htons(p_len);
5910                         /* zero out any padding required */
5911                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5912                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5913                 }
5914                 /* add CHUNKS parameter */
5915                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5916                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5917                     chunks->chunk_types);
5918                 if (p_len > 0) {
5919                         p_len += sizeof(*chunks);
5920                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5921                         chunks->ph.param_length = htons(p_len);
5922                         /* zero out any padding required */
5923                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5924                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5925                 }
5926         }
5927         m_at = m;
5928         /* now the addresses */
5929         {
5930                 struct sctp_scoping scp;
5931
5932                 /*
5933                  * To optimize this we could put the scoping stuff into a
5934                  * structure and remove the individual uint8's from the stc
5935                  * structure. Then we could just sifa in the address within
5936                  * the stc.. but for now this is a quick hack to get the
5937                  * address stuff teased apart.
5938                  */
5939                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5940                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5941                 scp.loopback_scope = stc.loopback_scope;
5942                 scp.ipv4_local_scope = stc.ipv4_scope;
5943                 scp.local_scope = stc.local_scope;
5944                 scp.site_scope = stc.site_scope;
5945                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5946         }
5947
5948         /* tack on the operational error if present */
5949         if (op_err) {
5950                 struct mbuf *ol;
5951                 int llen;
5952
5953                 llen = 0;
5954                 ol = op_err;
5955                 while (ol) {
5956                         llen += SCTP_BUF_LEN(ol);
5957                         ol = SCTP_BUF_NEXT(ol);
5958                 }
5959                 if (llen % 4) {
5960                         /* must add a pad to the param */
5961                         uint32_t cpthis = 0;
5962                         int padlen;
5963
5964                         padlen = 4 - (llen % 4);
5965                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5966                 }
5967                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5968                         m_at = SCTP_BUF_NEXT(m_at);
5969                 }
5970                 SCTP_BUF_NEXT(m_at) = op_err;
5971                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5972                         m_at = SCTP_BUF_NEXT(m_at);
5973                 }
5974         }
5975         /* pre-calulate the size and update pkt header and chunk header */
5976         p_len = 0;
5977         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5978                 p_len += SCTP_BUF_LEN(m_tmp);
5979                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5980                         /* m_tmp should now point to last one */
5981                         break;
5982                 }
5983         }
5984
5985         /* Now we must build a cookie */
5986         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m, 0, &stc, &signature);
5987         if (m_cookie == NULL) {
5988                 /* memory problem */
5989                 sctp_m_freem(m);
5990                 return;
5991         }
5992         /* Now append the cookie to the end and update the space/size */
5993         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5994
5995         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5996                 p_len += SCTP_BUF_LEN(m_tmp);
5997                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5998                         /* m_tmp should now point to last one */
5999                         mp_last = m_tmp;
6000                         break;
6001                 }
6002         }
6003         /*
6004          * Place in the size, but we don't include the last pad (if any) in
6005          * the INIT-ACK.
6006          */
6007         initack->ch.chunk_length = htons(p_len);
6008
6009         /*
6010          * Time to sign the cookie, we don't sign over the cookie signature
6011          * though thus we set trailer.
6012          */
6013         (void)sctp_hmac_m(SCTP_HMAC,
6014             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6015             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6016             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6017         /*
6018          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6019          * here since the timer will drive a retranmission.
6020          */
6021         padval = p_len % 4;
6022         if ((padval) && (mp_last)) {
6023                 /* see my previous comments on mp_last */
6024                 int ret;
6025
6026                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
6027                 if (ret) {
6028                         /* Houston we have a problem, no space */
6029                         sctp_m_freem(m);
6030                         return;
6031                 }
6032                 p_len += padval;
6033         }
6034         if (stc.loopback_scope) {
6035                 over_addr = &store1;
6036         } else {
6037                 over_addr = NULL;
6038         }
6039
6040         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6041             0, NULL, 0,
6042             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6043             port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
6044         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6045 }
6046
6047
6048 static void
6049 sctp_prune_prsctp(struct sctp_tcb *stcb,
6050     struct sctp_association *asoc,
6051     struct sctp_sndrcvinfo *srcv,
6052     int dataout)
6053 {
6054         int freed_spc = 0;
6055         struct sctp_tmit_chunk *chk, *nchk;
6056
6057         SCTP_TCB_LOCK_ASSERT(stcb);
6058         if ((asoc->peer_supports_prsctp) &&
6059             (asoc->sent_queue_cnt_removeable > 0)) {
6060                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6061                         /*
6062                          * Look for chunks marked with the PR_SCTP flag AND
6063                          * the buffer space flag. If the one being sent is
6064                          * equal or greater priority then purge the old one
6065                          * and free some space.
6066                          */
6067                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6068                                 /*
6069                                  * This one is PR-SCTP AND buffer space
6070                                  * limited type
6071                                  */
6072                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6073                                         /*
6074                                          * Lower numbers equates to higher
6075                                          * priority so if the one we are
6076                                          * looking at has a larger or equal
6077                                          * priority we want to drop the data
6078                                          * and NOT retransmit it.
6079                                          */
6080                                         if (chk->data) {
6081                                                 /*
6082                                                  * We release the book_size
6083                                                  * if the mbuf is here
6084                                                  */
6085                                                 int ret_spc;
6086                                                 int cause;
6087
6088                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6089                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
6090                                                 else
6091                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
6092                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6093                                                     cause,
6094                                                     SCTP_SO_LOCKED);
6095                                                 freed_spc += ret_spc;
6096                                                 if (freed_spc >= dataout) {
6097                                                         return;
6098                                                 }
6099                                         }       /* if chunk was present */
6100                                 }       /* if of sufficent priority */
6101                         }       /* if chunk has enabled */
6102                 }               /* tailqforeach */
6103
6104                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6105                         /* Here we must move to the sent queue and mark */
6106                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6107                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6108                                         if (chk->data) {
6109                                                 /*
6110                                                  * We release the book_size
6111                                                  * if the mbuf is here
6112                                                  */
6113                                                 int ret_spc;
6114
6115                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6116                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
6117                                                     SCTP_SO_LOCKED);
6118
6119                                                 freed_spc += ret_spc;
6120                                                 if (freed_spc >= dataout) {
6121                                                         return;
6122                                                 }
6123                                         }       /* end if chk->data */
6124                                 }       /* end if right class */
6125                         }       /* end if chk pr-sctp */
6126                 }               /* tailqforeachsafe (chk) */
6127         }                       /* if enabled in asoc */
6128 }
6129
6130 int
6131 sctp_get_frag_point(struct sctp_tcb *stcb,
6132     struct sctp_association *asoc)
6133 {
6134         int siz, ovh;
6135
6136         /*
6137          * For endpoints that have both v6 and v4 addresses we must reserve
6138          * room for the ipv6 header, for those that are only dealing with V4
6139          * we use a larger frag point.
6140          */
6141         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6142                 ovh = SCTP_MED_OVERHEAD;
6143         } else {
6144                 ovh = SCTP_MED_V4_OVERHEAD;
6145         }
6146
6147         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6148                 siz = asoc->smallest_mtu - ovh;
6149         else
6150                 siz = (stcb->asoc.sctp_frag_point - ovh);
6151         /*
6152          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6153          */
6154         /* A data chunk MUST fit in a cluster */
6155         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6156         /* } */
6157
6158         /* adjust for an AUTH chunk if DATA requires auth */
6159         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6160                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6161
6162         if (siz % 4) {
6163                 /* make it an even word boundary please */
6164                 siz -= (siz % 4);
6165         }
6166         return (siz);
6167 }
6168
6169 static void
6170 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6171 {
6172         sp->pr_sctp_on = 0;
6173         /*
6174          * We assume that the user wants PR_SCTP_TTL if the user provides a
6175          * positive lifetime but does not specify any PR_SCTP policy. This
6176          * is a BAD assumption and causes problems at least with the
6177          * U-Vancovers MPI folks. I will change this to be no policy means
6178          * NO PR-SCTP.
6179          */
6180         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6181                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6182                 sp->pr_sctp_on = 1;
6183         } else {
6184                 return;
6185         }
6186         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6187         case CHUNK_FLAGS_PR_SCTP_BUF:
6188                 /*
6189                  * Time to live is a priority stored in tv_sec when doing
6190                  * the buffer drop thing.
6191                  */
6192                 sp->ts.tv_sec = sp->timetolive;
6193                 sp->ts.tv_usec = 0;
6194                 break;
6195         case CHUNK_FLAGS_PR_SCTP_TTL:
6196                 {
6197                         struct timeval tv;
6198
6199                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6200                         tv.tv_sec = sp->timetolive / 1000;
6201                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6202                         /*
6203                          * TODO sctp_constants.h needs alternative time
6204                          * macros when _KERNEL is undefined.
6205                          */
6206                         timevaladd(&sp->ts, &tv);
6207                 }
6208                 break;
6209         case CHUNK_FLAGS_PR_SCTP_RTX:
6210                 /*
6211                  * Time to live is a the number or retransmissions stored in
6212                  * tv_sec.
6213                  */
6214                 sp->ts.tv_sec = sp->timetolive;
6215                 sp->ts.tv_usec = 0;
6216                 break;
6217         default:
6218                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6219                     "Unknown PR_SCTP policy %u.\n",
6220                     PR_SCTP_POLICY(sp->sinfo_flags));
6221                 break;
6222         }
6223 }
6224
6225 static int
6226 sctp_msg_append(struct sctp_tcb *stcb,
6227     struct sctp_nets *net,
6228     struct mbuf *m,
6229     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6230 {
6231         int error = 0, holds_lock;
6232         struct mbuf *at;
6233         struct sctp_stream_queue_pending *sp = NULL;
6234         struct sctp_stream_out *strm;
6235
6236         /*
6237          * Given an mbuf chain, put it into the association send queue and
6238          * place it on the wheel
6239          */
6240         holds_lock = hold_stcb_lock;
6241         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6242                 /* Invalid stream number */
6243                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6244                 error = EINVAL;
6245                 goto out_now;
6246         }
6247         if ((stcb->asoc.stream_locked) &&
6248             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6249                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6250                 error = EINVAL;
6251                 goto out_now;
6252         }
6253         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6254         /* Now can we send this? */
6255         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6256             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6257             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6258             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6259                 /* got data while shutting down */
6260                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6261                 error = ECONNRESET;
6262                 goto out_now;
6263         }
6264         sctp_alloc_a_strmoq(stcb, sp);
6265         if (sp == NULL) {
6266                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6267                 error = ENOMEM;
6268                 goto out_now;
6269         }
6270         sp->sinfo_flags = srcv->sinfo_flags;
6271         sp->timetolive = srcv->sinfo_timetolive;
6272         sp->ppid = srcv->sinfo_ppid;
6273         sp->context = srcv->sinfo_context;
6274         sp->strseq = 0;
6275         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6276                 sp->net = net;
6277                 atomic_add_int(&sp->net->ref_count, 1);
6278         } else {
6279                 sp->net = NULL;
6280         }
6281         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6282         sp->stream = srcv->sinfo_stream;
6283         sp->msg_is_complete = 1;
6284         sp->sender_all_done = 1;
6285         sp->some_taken = 0;
6286         sp->data = m;
6287         sp->tail_mbuf = NULL;
6288         sctp_set_prsctp_policy(sp);
6289         /*
6290          * We could in theory (for sendall) sifa the length in, but we would
6291          * still have to hunt through the chain since we need to setup the
6292          * tail_mbuf
6293          */
6294         sp->length = 0;
6295         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6296                 if (SCTP_BUF_NEXT(at) == NULL)
6297                         sp->tail_mbuf = at;
6298                 sp->length += SCTP_BUF_LEN(at);
6299         }
6300         if (srcv->sinfo_keynumber_valid) {
6301                 sp->auth_keyid = srcv->sinfo_keynumber;
6302         } else {
6303                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6304         }
6305         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6306                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6307                 sp->holds_key_ref = 1;
6308         }
6309         SCTP_TCB_SEND_LOCK(stcb);
6310         sctp_snd_sb_alloc(stcb, sp->length);
6311         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6312         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6313         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6314                 sp->strseq = strm->next_sequence_sent;
6315                 strm->next_sequence_sent++;
6316         }
6317         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6318         m = NULL;
6319         SCTP_TCB_SEND_UNLOCK(stcb);
6320 out_now:
6321         if (m) {
6322                 sctp_m_freem(m);
6323         }
6324         return (error);
6325 }
6326
6327
6328 static struct mbuf *
6329 sctp_copy_mbufchain(struct mbuf *clonechain,
6330     struct mbuf *outchain,
6331     struct mbuf **endofchain,
6332     int can_take_mbuf,
6333     int sizeofcpy,
6334     uint8_t copy_by_ref)
6335 {
6336         struct mbuf *m;
6337         struct mbuf *appendchain;
6338         caddr_t cp;
6339         int len;
6340
6341         if (endofchain == NULL) {
6342                 /* error */
6343 error_out:
6344                 if (outchain)
6345                         sctp_m_freem(outchain);
6346                 return (NULL);
6347         }
6348         if (can_take_mbuf) {
6349                 appendchain = clonechain;
6350         } else {
6351                 if (!copy_by_ref &&
6352                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6353                     ) {
6354                         /* Its not in a cluster */
6355                         if (*endofchain == NULL) {
6356                                 /* lets get a mbuf cluster */
6357                                 if (outchain == NULL) {
6358                                         /* This is the general case */
6359                         new_mbuf:
6360                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6361                                         if (outchain == NULL) {
6362                                                 goto error_out;
6363                                         }
6364                                         SCTP_BUF_LEN(outchain) = 0;
6365                                         *endofchain = outchain;
6366                                         /* get the prepend space */
6367                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6368                                 } else {
6369                                         /*
6370                                          * We really should not get a NULL
6371                                          * in endofchain
6372                                          */
6373                                         /* find end */
6374                                         m = outchain;
6375                                         while (m) {
6376                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6377                                                         *endofchain = m;
6378                                                         break;
6379                                                 }
6380                                                 m = SCTP_BUF_NEXT(m);
6381                                         }
6382                                         /* sanity */
6383                                         if (*endofchain == NULL) {
6384                                                 /*
6385                                                  * huh, TSNH XXX maybe we
6386                                                  * should panic
6387                                                  */
6388                                                 sctp_m_freem(outchain);
6389                                                 goto new_mbuf;
6390                                         }
6391                                 }
6392                                 /* get the new end of length */
6393                                 len = M_TRAILINGSPACE(*endofchain);
6394                         } else {
6395                                 /* how much is left at the end? */
6396                                 len = M_TRAILINGSPACE(*endofchain);
6397                         }
6398                         /* Find the end of the data, for appending */
6399                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6400
6401                         /* Now lets copy it out */
6402                         if (len >= sizeofcpy) {
6403                                 /* It all fits, copy it in */
6404                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6405                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6406                         } else {
6407                                 /* fill up the end of the chain */
6408                                 if (len > 0) {
6409                                         m_copydata(clonechain, 0, len, cp);
6410                                         SCTP_BUF_LEN((*endofchain)) += len;
6411                                         /* now we need another one */
6412                                         sizeofcpy -= len;
6413                                 }
6414                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6415                                 if (m == NULL) {
6416                                         /* We failed */
6417                                         goto error_out;
6418                                 }
6419                                 SCTP_BUF_NEXT((*endofchain)) = m;
6420                                 *endofchain = m;
6421                                 cp = mtod((*endofchain), caddr_t);
6422                                 m_copydata(clonechain, len, sizeofcpy, cp);
6423                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6424                         }
6425                         return (outchain);
6426                 } else {
6427                         /* copy the old fashion way */
6428                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6429 #ifdef SCTP_MBUF_LOGGING
6430                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6431                                 struct mbuf *mat;
6432
6433                                 mat = appendchain;
6434                                 while (mat) {
6435                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6436                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6437                                         }
6438                                         mat = SCTP_BUF_NEXT(mat);
6439                                 }
6440                         }
6441 #endif
6442                 }
6443         }
6444         if (appendchain == NULL) {
6445                 /* error */
6446                 if (outchain)
6447                         sctp_m_freem(outchain);
6448                 return (NULL);
6449         }
6450         if (outchain) {
6451                 /* tack on to the end */
6452                 if (*endofchain != NULL) {
6453                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6454                 } else {
6455                         m = outchain;
6456                         while (m) {
6457                                 if (SCTP_BUF_NEXT(m) == NULL) {
6458                                         SCTP_BUF_NEXT(m) = appendchain;
6459                                         break;
6460                                 }
6461                                 m = SCTP_BUF_NEXT(m);
6462                         }
6463                 }
6464                 /*
6465                  * save off the end and update the end-chain postion
6466                  */
6467                 m = appendchain;
6468                 while (m) {
6469                         if (SCTP_BUF_NEXT(m) == NULL) {
6470                                 *endofchain = m;
6471                                 break;
6472                         }
6473                         m = SCTP_BUF_NEXT(m);
6474                 }
6475                 return (outchain);
6476         } else {
6477                 /* save off the end and update the end-chain postion */
6478                 m = appendchain;
6479                 while (m) {
6480                         if (SCTP_BUF_NEXT(m) == NULL) {
6481                                 *endofchain = m;
6482                                 break;
6483                         }
6484                         m = SCTP_BUF_NEXT(m);
6485                 }
6486                 return (appendchain);
6487         }
6488 }
6489
6490 int
6491 sctp_med_chunk_output(struct sctp_inpcb *inp,
6492     struct sctp_tcb *stcb,
6493     struct sctp_association *asoc,
6494     int *num_out,
6495     int *reason_code,
6496     int control_only, int from_where,
6497     struct timeval *now, int *now_filled, int frag_point, int so_locked
6498 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6499     SCTP_UNUSED
6500 #endif
6501 );
6502
6503 static void
6504 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6505     uint32_t val)
6506 {
6507         struct sctp_copy_all *ca;
6508         struct mbuf *m;
6509         int ret = 0;
6510         int added_control = 0;
6511         int un_sent, do_chunk_output = 1;
6512         struct sctp_association *asoc;
6513         struct sctp_nets *net;
6514
6515         ca = (struct sctp_copy_all *)ptr;
6516         if (ca->m == NULL) {
6517                 return;
6518         }
6519         if (ca->inp != inp) {
6520                 /* TSNH */
6521                 return;
6522         }
6523         if ((ca->m) && ca->sndlen) {
6524                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6525                 if (m == NULL) {
6526                         /* can't copy so we are done */
6527                         ca->cnt_failed++;
6528                         return;
6529                 }
6530 #ifdef SCTP_MBUF_LOGGING
6531                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6532                         struct mbuf *mat;
6533
6534                         mat = m;
6535                         while (mat) {
6536                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6537                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6538                                 }
6539                                 mat = SCTP_BUF_NEXT(mat);
6540                         }
6541                 }
6542 #endif
6543         } else {
6544                 m = NULL;
6545         }
6546         SCTP_TCB_LOCK_ASSERT(stcb);
6547         if (stcb->asoc.alternate) {
6548                 net = stcb->asoc.alternate;
6549         } else {
6550                 net = stcb->asoc.primary_destination;
6551         }
6552         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6553                 /* Abort this assoc with m as the user defined reason */
6554                 if (m) {
6555                         struct sctp_paramhdr *ph;
6556
6557                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6558                         if (m) {
6559                                 ph = mtod(m, struct sctp_paramhdr *);
6560                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6561                                 ph->param_length = htons(ca->sndlen);
6562                         }
6563                         /*
6564                          * We add one here to keep the assoc from
6565                          * dis-appearing on us.
6566                          */
6567                         atomic_add_int(&stcb->asoc.refcnt, 1);
6568                         sctp_abort_an_association(inp, stcb,
6569                             SCTP_RESPONSE_TO_USER_REQ,
6570                             m, SCTP_SO_NOT_LOCKED);
6571                         /*
6572                          * sctp_abort_an_association calls sctp_free_asoc()
6573                          * free association will NOT free it since we
6574                          * incremented the refcnt .. we do this to prevent
6575                          * it being freed and things getting tricky since we
6576                          * could end up (from free_asoc) calling inpcb_free
6577                          * which would get a recursive lock call to the
6578                          * iterator lock.. But as a consequence of that the
6579                          * stcb will return to us un-locked.. since
6580                          * free_asoc returns with either no TCB or the TCB
6581                          * unlocked, we must relock.. to unlock in the
6582                          * iterator timer :-0
6583                          */
6584                         SCTP_TCB_LOCK(stcb);
6585                         atomic_add_int(&stcb->asoc.refcnt, -1);
6586                         goto no_chunk_output;
6587                 }
6588         } else {
6589                 if (m) {
6590                         ret = sctp_msg_append(stcb, net, m,
6591                             &ca->sndrcv, 1);
6592                 }
6593                 asoc = &stcb->asoc;
6594                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6595                         /* shutdown this assoc */
6596                         int cnt;
6597
6598                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6599
6600                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6601                             TAILQ_EMPTY(&asoc->sent_queue) &&
6602                             (cnt == 0)) {
6603                                 if (asoc->locked_on_sending) {
6604                                         goto abort_anyway;
6605                                 }
6606                                 /*
6607                                  * there is nothing queued to send, so I'm
6608                                  * done...
6609                                  */
6610                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6611                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6612                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6613                                         /*
6614                                          * only send SHUTDOWN the first time
6615                                          * through
6616                                          */
6617                                         sctp_send_shutdown(stcb, net);
6618                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6619                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6620                                         }
6621                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6622                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6623                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6624                                             net);
6625                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6626                                             asoc->primary_destination);
6627                                         added_control = 1;
6628                                         do_chunk_output = 0;
6629                                 }
6630                         } else {
6631                                 /*
6632                                  * we still got (or just got) data to send,
6633                                  * so set SHUTDOWN_PENDING
6634                                  */
6635                                 /*
6636                                  * XXX sockets draft says that SCTP_EOF
6637                                  * should be sent with no data.  currently,
6638                                  * we will allow user data to be sent first
6639                                  * and move to SHUTDOWN-PENDING
6640                                  */
6641                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6642                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6643                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6644                                         if (asoc->locked_on_sending) {
6645                                                 /*
6646                                                  * Locked to send out the
6647                                                  * data
6648                                                  */
6649                                                 struct sctp_stream_queue_pending *sp;
6650
6651                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6652                                                 if (sp) {
6653                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6654                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6655                                                 }
6656                                         }
6657                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6658                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6659                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6660                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6661                                 abort_anyway:
6662                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6663                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6664                                                     SCTP_RESPONSE_TO_USER_REQ,
6665                                                     NULL, SCTP_SO_NOT_LOCKED);
6666                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6667                                                 goto no_chunk_output;
6668                                         }
6669                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6670                                             asoc->primary_destination);
6671                                 }
6672                         }
6673
6674                 }
6675         }
6676         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6677             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6678
6679         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6680             (stcb->asoc.total_flight > 0) &&
6681             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6682             ) {
6683                 do_chunk_output = 0;
6684         }
6685         if (do_chunk_output)
6686                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6687         else if (added_control) {
6688                 int num_out = 0, reason = 0, now_filled = 0;
6689                 struct timeval now;
6690                 int frag_point;
6691
6692                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6693                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6694                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6695         }
6696 no_chunk_output:
6697         if (ret) {
6698                 ca->cnt_failed++;
6699         } else {
6700                 ca->cnt_sent++;
6701         }
6702 }
6703
6704 static void
6705 sctp_sendall_completes(void *ptr, uint32_t val)
6706 {
6707         struct sctp_copy_all *ca;
6708
6709         ca = (struct sctp_copy_all *)ptr;
6710         /*
6711          * Do a notify here? Kacheong suggests that the notify be done at
6712          * the send time.. so you would push up a notification if any send
6713          * failed. Don't know if this is feasable since the only failures we
6714          * have is "memory" related and if you cannot get an mbuf to send
6715          * the data you surely can't get an mbuf to send up to notify the
6716          * user you can't send the data :->
6717          */
6718
6719         /* now free everything */
6720         sctp_m_freem(ca->m);
6721         SCTP_FREE(ca, SCTP_M_COPYAL);
6722 }
6723
6724
6725 #define MC_ALIGN(m, len) do {                                           \
6726         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6727 } while (0)
6728
6729
6730
6731 static struct mbuf *
6732 sctp_copy_out_all(struct uio *uio, int len)
6733 {
6734         struct mbuf *ret, *at;
6735         int left, willcpy, cancpy, error;
6736
6737         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6738         if (ret == NULL) {
6739                 /* TSNH */
6740                 return (NULL);
6741         }
6742         left = len;
6743         SCTP_BUF_LEN(ret) = 0;
6744         /* save space for the data chunk header */
6745         cancpy = M_TRAILINGSPACE(ret);
6746         willcpy = min(cancpy, left);
6747         at = ret;
6748         while (left > 0) {
6749                 /* Align data to the end */
6750                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6751                 if (error) {
6752         err_out_now:
6753                         sctp_m_freem(at);
6754                         return (NULL);
6755                 }
6756                 SCTP_BUF_LEN(at) = willcpy;
6757                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6758                 left -= willcpy;
6759                 if (left > 0) {
6760                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6761                         if (SCTP_BUF_NEXT(at) == NULL) {
6762                                 goto err_out_now;
6763                         }
6764                         at = SCTP_BUF_NEXT(at);
6765                         SCTP_BUF_LEN(at) = 0;
6766                         cancpy = M_TRAILINGSPACE(at);
6767                         willcpy = min(cancpy, left);
6768                 }
6769         }
6770         return (ret);
6771 }
6772
6773 static int
6774 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6775     struct sctp_sndrcvinfo *srcv)
6776 {
6777         int ret;
6778         struct sctp_copy_all *ca;
6779
6780         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6781             SCTP_M_COPYAL);
6782         if (ca == NULL) {
6783                 sctp_m_freem(m);
6784                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6785                 return (ENOMEM);
6786         }
6787         memset(ca, 0, sizeof(struct sctp_copy_all));
6788
6789         ca->inp = inp;
6790         if (srcv) {
6791                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6792         }
6793         /*
6794          * take off the sendall flag, it would be bad if we failed to do
6795          * this :-0
6796          */
6797         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6798         /* get length and mbuf chain */
6799         if (uio) {
6800                 ca->sndlen = uio->uio_resid;
6801                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6802                 if (ca->m == NULL) {
6803                         SCTP_FREE(ca, SCTP_M_COPYAL);
6804                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6805                         return (ENOMEM);
6806                 }
6807         } else {
6808                 /* Gather the length of the send */
6809                 struct mbuf *mat;
6810
6811                 mat = m;
6812                 ca->sndlen = 0;
6813                 while (m) {
6814                         ca->sndlen += SCTP_BUF_LEN(m);
6815                         m = SCTP_BUF_NEXT(m);
6816                 }
6817                 ca->m = mat;
6818         }
6819         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6820             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6821             SCTP_ASOC_ANY_STATE,
6822             (void *)ca, 0,
6823             sctp_sendall_completes, inp, 1);
6824         if (ret) {
6825                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6826                 SCTP_FREE(ca, SCTP_M_COPYAL);
6827                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6828                 return (EFAULT);
6829         }
6830         return (0);
6831 }
6832
6833
6834 void
6835 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6836 {
6837         struct sctp_tmit_chunk *chk, *nchk;
6838
6839         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6840                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6841                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6842                         if (chk->data) {
6843                                 sctp_m_freem(chk->data);
6844                                 chk->data = NULL;
6845                         }
6846                         asoc->ctrl_queue_cnt--;
6847                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6848                 }
6849         }
6850 }
6851
6852 void
6853 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6854 {
6855         struct sctp_association *asoc;
6856         struct sctp_tmit_chunk *chk, *nchk;
6857         struct sctp_asconf_chunk *acp;
6858
6859         asoc = &stcb->asoc;
6860         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6861                 /* find SCTP_ASCONF chunk in queue */
6862                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6863                         if (chk->data) {
6864                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6865                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6866                                         /* Not Acked yet */
6867                                         break;
6868                                 }
6869                         }
6870                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6871                         if (chk->data) {
6872                                 sctp_m_freem(chk->data);
6873                                 chk->data = NULL;
6874                         }
6875                         asoc->ctrl_queue_cnt--;
6876                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6877                 }
6878         }
6879 }
6880
6881
6882 static void
6883 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6884     struct sctp_association *asoc,
6885     struct sctp_tmit_chunk **data_list,
6886     int bundle_at,
6887     struct sctp_nets *net)
6888 {
6889         int i;
6890         struct sctp_tmit_chunk *tp1;
6891
6892         for (i = 0; i < bundle_at; i++) {
6893                 /* off of the send queue */
6894                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6895                 asoc->send_queue_cnt--;
6896                 if (i > 0) {
6897                         /*
6898                          * Any chunk NOT 0 you zap the time chunk 0 gets
6899                          * zapped or set based on if a RTO measurment is
6900                          * needed.
6901                          */
6902                         data_list[i]->do_rtt = 0;
6903                 }
6904                 /* record time */
6905                 data_list[i]->sent_rcv_time = net->last_sent_time;
6906                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6907                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6908                 if (data_list[i]->whoTo == NULL) {
6909                         data_list[i]->whoTo = net;
6910                         atomic_add_int(&net->ref_count, 1);
6911                 }
6912                 /* on to the sent queue */
6913                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6914                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6915                         struct sctp_tmit_chunk *tpp;
6916
6917                         /* need to move back */
6918         back_up_more:
6919                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6920                         if (tpp == NULL) {
6921                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6922                                 goto all_done;
6923                         }
6924                         tp1 = tpp;
6925                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6926                                 goto back_up_more;
6927                         }
6928                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6929                 } else {
6930                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6931                             data_list[i],
6932                             sctp_next);
6933                 }
6934 all_done:
6935                 /* This does not lower until the cum-ack passes it */
6936                 asoc->sent_queue_cnt++;
6937                 if ((asoc->peers_rwnd <= 0) &&
6938                     (asoc->total_flight == 0) &&
6939                     (bundle_at == 1)) {
6940                         /* Mark the chunk as being a window probe */
6941                         SCTP_STAT_INCR(sctps_windowprobed);
6942                 }
6943 #ifdef SCTP_AUDITING_ENABLED
6944                 sctp_audit_log(0xC2, 3);
6945 #endif
6946                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6947                 data_list[i]->snd_count = 1;
6948                 data_list[i]->rec.data.chunk_was_revoked = 0;
6949                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6950                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6951                             data_list[i]->whoTo->flight_size,
6952                             data_list[i]->book_size,
6953                             (uintptr_t) data_list[i]->whoTo,
6954                             data_list[i]->rec.data.TSN_seq);
6955                 }
6956                 sctp_flight_size_increase(data_list[i]);
6957                 sctp_total_flight_increase(stcb, data_list[i]);
6958                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6959                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6960                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6961                 }
6962                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6963                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6964                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6965                         /* SWS sender side engages */
6966                         asoc->peers_rwnd = 0;
6967                 }
6968         }
6969         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6970                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6971         }
6972 }
6973
6974 static void
6975 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6976 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6977     SCTP_UNUSED
6978 #endif
6979 )
6980 {
6981         struct sctp_tmit_chunk *chk, *nchk;
6982
6983         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6984                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6985                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6986                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6987                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6988                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6989                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6990                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6991                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6992                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6993                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6994                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6995                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6996                         /* Stray chunks must be cleaned up */
6997         clean_up_anyway:
6998                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6999                         if (chk->data) {
7000                                 sctp_m_freem(chk->data);
7001                                 chk->data = NULL;
7002                         }
7003                         asoc->ctrl_queue_cnt--;
7004                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7005                                 asoc->fwd_tsn_cnt--;
7006                         sctp_free_a_chunk(stcb, chk, so_locked);
7007                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7008                         /* special handling, we must look into the param */
7009                         if (chk != asoc->str_reset) {
7010                                 goto clean_up_anyway;
7011                         }
7012                 }
7013         }
7014 }
7015
7016
7017 static int
7018 sctp_can_we_split_this(struct sctp_tcb *stcb,
7019     uint32_t length,
7020     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7021 {
7022         /*
7023          * Make a decision on if I should split a msg into multiple parts.
7024          * This is only asked of incomplete messages.
7025          */
7026         if (eeor_on) {
7027                 /*
7028                  * If we are doing EEOR we need to always send it if its the
7029                  * entire thing, since it might be all the guy is putting in
7030                  * the hopper.
7031                  */
7032                 if (goal_mtu >= length) {
7033                         /*-
7034                          * If we have data outstanding,
7035                          * we get another chance when the sack
7036                          * arrives to transmit - wait for more data
7037                          */
7038                         if (stcb->asoc.total_flight == 0) {
7039                                 /*
7040                                  * If nothing is in flight, we zero the
7041                                  * packet counter.
7042                                  */
7043                                 return (length);
7044                         }
7045                         return (0);
7046
7047                 } else {
7048                         /* You can fill the rest */
7049                         return (goal_mtu);
7050                 }
7051         }
7052         /*-
7053          * For those strange folk that make the send buffer
7054          * smaller than our fragmentation point, we can't
7055          * get a full msg in so we have to allow splitting.
7056          */
7057         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7058                 return (length);
7059         }
7060         if ((length <= goal_mtu) ||
7061             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7062                 /* Sub-optimial residual don't split in non-eeor mode. */
7063                 return (0);
7064         }
7065         /*
7066          * If we reach here length is larger than the goal_mtu. Do we wish
7067          * to split it for the sake of packet putting together?
7068          */
7069         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7070                 /* Its ok to split it */
7071                 return (min(goal_mtu, frag_point));
7072         }
7073         /* Nope, can't split */
7074         return (0);
7075
7076 }
7077
7078 static uint32_t
7079 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7080     struct sctp_stream_out *strq,
7081     uint32_t goal_mtu,
7082     uint32_t frag_point,
7083     int *locked,
7084     int *giveup,
7085     int eeor_mode,
7086     int *bail,
7087     int so_locked
7088 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7089     SCTP_UNUSED
7090 #endif
7091 )
7092 {
7093         /* Move from the stream to the send_queue keeping track of the total */
7094         struct sctp_association *asoc;
7095         struct sctp_stream_queue_pending *sp;
7096         struct sctp_tmit_chunk *chk;
7097         struct sctp_data_chunk *dchkh;
7098         uint32_t to_move, length;
7099         uint8_t rcv_flags = 0;
7100         uint8_t some_taken;
7101         uint8_t send_lock_up = 0;
7102
7103         SCTP_TCB_LOCK_ASSERT(stcb);
7104         asoc = &stcb->asoc;
7105 one_more_time:
7106         /* sa_ignore FREED_MEMORY */
7107         sp = TAILQ_FIRST(&strq->outqueue);
7108         if (sp == NULL) {
7109                 *locked = 0;
7110                 if (send_lock_up == 0) {
7111                         SCTP_TCB_SEND_LOCK(stcb);
7112                         send_lock_up = 1;
7113                 }
7114                 sp = TAILQ_FIRST(&strq->outqueue);
7115                 if (sp) {
7116                         goto one_more_time;
7117                 }
7118                 if (strq->last_msg_incomplete) {
7119                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7120                             strq->stream_no,
7121                             strq->last_msg_incomplete);
7122                         strq->last_msg_incomplete = 0;
7123                 }
7124                 to_move = 0;
7125                 if (send_lock_up) {
7126                         SCTP_TCB_SEND_UNLOCK(stcb);
7127                         send_lock_up = 0;
7128                 }
7129                 goto out_of;
7130         }
7131         if ((sp->msg_is_complete) && (sp->length == 0)) {
7132                 if (sp->sender_all_done) {
7133                         /*
7134                          * We are doing differed cleanup. Last time through
7135                          * when we took all the data the sender_all_done was
7136                          * not set.
7137                          */
7138                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7139                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7140                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7141                                     sp->sender_all_done,
7142                                     sp->length,
7143                                     sp->msg_is_complete,
7144                                     sp->put_last_out,
7145                                     send_lock_up);
7146                         }
7147                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7148                                 SCTP_TCB_SEND_LOCK(stcb);
7149                                 send_lock_up = 1;
7150                         }
7151                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7152                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7153                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7154                         if (sp->net) {
7155                                 sctp_free_remote_addr(sp->net);
7156                                 sp->net = NULL;
7157                         }
7158                         if (sp->data) {
7159                                 sctp_m_freem(sp->data);
7160                                 sp->data = NULL;
7161                         }
7162                         sctp_free_a_strmoq(stcb, sp, so_locked);
7163                         /* we can't be locked to it */
7164                         *locked = 0;
7165                         stcb->asoc.locked_on_sending = NULL;
7166                         if (send_lock_up) {
7167                                 SCTP_TCB_SEND_UNLOCK(stcb);
7168                                 send_lock_up = 0;
7169                         }
7170                         /* back to get the next msg */
7171                         goto one_more_time;
7172                 } else {
7173                         /*
7174                          * sender just finished this but still holds a
7175                          * reference
7176                          */
7177                         *locked = 1;
7178                         *giveup = 1;
7179                         to_move = 0;
7180                         goto out_of;
7181                 }
7182         } else {
7183                 /* is there some to get */
7184                 if (sp->length == 0) {
7185                         /* no */
7186                         *locked = 1;
7187                         *giveup = 1;
7188                         to_move = 0;
7189                         goto out_of;
7190                 } else if (sp->discard_rest) {
7191                         if (send_lock_up == 0) {
7192                                 SCTP_TCB_SEND_LOCK(stcb);
7193                                 send_lock_up = 1;
7194                         }
7195                         /* Whack down the size */
7196                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7197                         if ((stcb->sctp_socket != NULL) && \
7198                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7199                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7200                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7201                         }
7202                         if (sp->data) {
7203                                 sctp_m_freem(sp->data);
7204                                 sp->data = NULL;
7205                                 sp->tail_mbuf = NULL;
7206                         }
7207                         sp->length = 0;
7208                         sp->some_taken = 1;
7209                         *locked = 1;
7210                         *giveup = 1;
7211                         to_move = 0;
7212                         goto out_of;
7213                 }
7214         }
7215         some_taken = sp->some_taken;
7216         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7217                 sp->msg_is_complete = 1;
7218         }
7219 re_look:
7220         length = sp->length;
7221         if (sp->msg_is_complete) {
7222                 /* The message is complete */
7223                 to_move = min(length, frag_point);
7224                 if (to_move == length) {
7225                         /* All of it fits in the MTU */
7226                         if (sp->some_taken) {
7227                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7228                                 sp->put_last_out = 1;
7229                         } else {
7230                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7231                                 sp->put_last_out = 1;
7232                         }
7233                 } else {
7234                         /* Not all of it fits, we fragment */
7235                         if (sp->some_taken == 0) {
7236                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7237                         }
7238                         sp->some_taken = 1;
7239                 }
7240         } else {
7241                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7242                 if (to_move) {
7243                         /*-
7244                          * We use a snapshot of length in case it
7245                          * is expanding during the compare.
7246                          */
7247                         uint32_t llen;
7248
7249                         llen = length;
7250                         if (to_move >= llen) {
7251                                 to_move = llen;
7252                                 if (send_lock_up == 0) {
7253                                         /*-
7254                                          * We are taking all of an incomplete msg
7255                                          * thus we need a send lock.
7256                                          */
7257                                         SCTP_TCB_SEND_LOCK(stcb);
7258                                         send_lock_up = 1;
7259                                         if (sp->msg_is_complete) {
7260                                                 /*
7261                                                  * the sender finished the
7262                                                  * msg
7263                                                  */
7264                                                 goto re_look;
7265                                         }
7266                                 }
7267                         }
7268                         if (sp->some_taken == 0) {
7269                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7270                                 sp->some_taken = 1;
7271                         }
7272                 } else {
7273                         /* Nothing to take. */
7274                         if (sp->some_taken) {
7275                                 *locked = 1;
7276                         }
7277                         *giveup = 1;
7278                         to_move = 0;
7279                         goto out_of;
7280                 }
7281         }
7282
7283         /* If we reach here, we can copy out a chunk */
7284         sctp_alloc_a_chunk(stcb, chk);
7285         if (chk == NULL) {
7286                 /* No chunk memory */
7287                 *giveup = 1;
7288                 to_move = 0;
7289                 goto out_of;
7290         }
7291         /*
7292          * Setup for unordered if needed by looking at the user sent info
7293          * flags.
7294          */
7295         if (sp->sinfo_flags & SCTP_UNORDERED) {
7296                 rcv_flags |= SCTP_DATA_UNORDERED;
7297         }
7298         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7299             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7300                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7301         }
7302         /* clear out the chunk before setting up */
7303         memset(chk, 0, sizeof(*chk));
7304         chk->rec.data.rcv_flags = rcv_flags;
7305
7306         if (to_move >= length) {
7307                 /* we think we can steal the whole thing */
7308                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7309                         SCTP_TCB_SEND_LOCK(stcb);
7310                         send_lock_up = 1;
7311                 }
7312                 if (to_move < sp->length) {
7313                         /* bail, it changed */
7314                         goto dont_do_it;
7315                 }
7316                 chk->data = sp->data;
7317                 chk->last_mbuf = sp->tail_mbuf;
7318                 /* register the stealing */
7319                 sp->data = sp->tail_mbuf = NULL;
7320         } else {
7321                 struct mbuf *m;
7322
7323 dont_do_it:
7324                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7325                 chk->last_mbuf = NULL;
7326                 if (chk->data == NULL) {
7327                         sp->some_taken = some_taken;
7328                         sctp_free_a_chunk(stcb, chk, so_locked);
7329                         *bail = 1;
7330                         to_move = 0;
7331                         goto out_of;
7332                 }
7333 #ifdef SCTP_MBUF_LOGGING
7334                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7335                         struct mbuf *mat;
7336
7337                         mat = chk->data;
7338                         while (mat) {
7339                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7340                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7341                                 }
7342                                 mat = SCTP_BUF_NEXT(mat);
7343                         }
7344                 }
7345 #endif
7346                 /* Pull off the data */
7347                 m_adj(sp->data, to_move);
7348                 /* Now lets work our way down and compact it */
7349                 m = sp->data;
7350                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7351                         sp->data = SCTP_BUF_NEXT(m);
7352                         SCTP_BUF_NEXT(m) = NULL;
7353                         if (sp->tail_mbuf == m) {
7354                                 /*-
7355                                  * Freeing tail? TSNH since
7356                                  * we supposedly were taking less
7357                                  * than the sp->length.
7358                                  */
7359 #ifdef INVARIANTS
7360                                 panic("Huh, freing tail? - TSNH");
7361 #else
7362                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7363                                 sp->tail_mbuf = sp->data = NULL;
7364                                 sp->length = 0;
7365 #endif
7366
7367                         }
7368                         sctp_m_free(m);
7369                         m = sp->data;
7370                 }
7371         }
7372         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7373                 chk->copy_by_ref = 1;
7374         } else {
7375                 chk->copy_by_ref = 0;
7376         }
7377         /*
7378          * get last_mbuf and counts of mb useage This is ugly but hopefully
7379          * its only one mbuf.
7380          */
7381         if (chk->last_mbuf == NULL) {
7382                 chk->last_mbuf = chk->data;
7383                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7384                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7385                 }
7386         }
7387         if (to_move > length) {
7388                 /*- This should not happen either
7389                  * since we always lower to_move to the size
7390                  * of sp->length if its larger.
7391                  */
7392 #ifdef INVARIANTS
7393                 panic("Huh, how can to_move be larger?");
7394 #else
7395                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7396                 sp->length = 0;
7397 #endif
7398         } else {
7399                 atomic_subtract_int(&sp->length, to_move);
7400         }
7401         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7402                 /* Not enough room for a chunk header, get some */
7403                 struct mbuf *m;
7404
7405                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7406                 if (m == NULL) {
7407                         /*
7408                          * we're in trouble here. _PREPEND below will free
7409                          * all the data if there is no leading space, so we
7410                          * must put the data back and restore.
7411                          */
7412                         if (send_lock_up == 0) {
7413                                 SCTP_TCB_SEND_LOCK(stcb);
7414                                 send_lock_up = 1;
7415                         }
7416                         if (chk->data == NULL) {
7417                                 /* unsteal the data */
7418                                 sp->data = chk->data;
7419                                 sp->tail_mbuf = chk->last_mbuf;
7420                         } else {
7421                                 struct mbuf *m_tmp;
7422
7423                                 /* reassemble the data */
7424                                 m_tmp = sp->data;
7425                                 sp->data = chk->data;
7426                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7427                         }
7428                         sp->some_taken = some_taken;
7429                         atomic_add_int(&sp->length, to_move);
7430                         chk->data = NULL;
7431                         *bail = 1;
7432                         sctp_free_a_chunk(stcb, chk, so_locked);
7433                         to_move = 0;
7434                         goto out_of;
7435                 } else {
7436                         SCTP_BUF_LEN(m) = 0;
7437                         SCTP_BUF_NEXT(m) = chk->data;
7438                         chk->data = m;
7439                         M_ALIGN(chk->data, 4);
7440                 }
7441         }
7442         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7443         if (chk->data == NULL) {
7444                 /* HELP, TSNH since we assured it would not above? */
7445 #ifdef INVARIANTS
7446                 panic("prepend failes HELP?");
7447 #else
7448                 SCTP_PRINTF("prepend fails HELP?\n");
7449                 sctp_free_a_chunk(stcb, chk, so_locked);
7450 #endif
7451                 *bail = 1;
7452                 to_move = 0;
7453                 goto out_of;
7454         }
7455         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7456         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7457         chk->book_size_scale = 0;
7458         chk->sent = SCTP_DATAGRAM_UNSENT;
7459
7460         chk->flags = 0;
7461         chk->asoc = &stcb->asoc;
7462         chk->pad_inplace = 0;
7463         chk->no_fr_allowed = 0;
7464         chk->rec.data.stream_seq = sp->strseq;
7465         chk->rec.data.stream_number = sp->stream;
7466         chk->rec.data.payloadtype = sp->ppid;
7467         chk->rec.data.context = sp->context;
7468         chk->rec.data.doing_fast_retransmit = 0;
7469
7470         chk->rec.data.timetodrop = sp->ts;
7471         chk->flags = sp->act_flags;
7472
7473         if (sp->net) {
7474                 chk->whoTo = sp->net;
7475                 atomic_add_int(&chk->whoTo->ref_count, 1);
7476         } else
7477                 chk->whoTo = NULL;
7478
7479         if (sp->holds_key_ref) {
7480                 chk->auth_keyid = sp->auth_keyid;
7481                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7482                 chk->holds_key_ref = 1;
7483         }
7484         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7485         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7486                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7487                     (uintptr_t) stcb, sp->length,
7488                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7489                     chk->rec.data.TSN_seq);
7490         }
7491         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7492         /*
7493          * Put the rest of the things in place now. Size was done earlier in
7494          * previous loop prior to padding.
7495          */
7496
7497 #ifdef SCTP_ASOCLOG_OF_TSNS
7498         SCTP_TCB_LOCK_ASSERT(stcb);
7499         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7500                 asoc->tsn_out_at = 0;
7501                 asoc->tsn_out_wrapped = 1;
7502         }
7503         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7504         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7505         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7506         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7507         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7508         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7509         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7510         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7511         asoc->tsn_out_at++;
7512 #endif
7513
7514         dchkh->ch.chunk_type = SCTP_DATA;
7515         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7516         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7517         dchkh->dp.stream_id = htons(strq->stream_no);
7518         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7519         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7520         dchkh->ch.chunk_length = htons(chk->send_size);
7521         /* Now advance the chk->send_size by the actual pad needed. */
7522         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7523                 /* need a pad */
7524                 struct mbuf *lm;
7525                 int pads;
7526
7527                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7528                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7529                         chk->pad_inplace = 1;
7530                 }
7531                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7532                         /* pad added an mbuf */
7533                         chk->last_mbuf = lm;
7534                 }
7535                 chk->send_size += pads;
7536         }
7537         /* We only re-set the policy if it is on */
7538         if (sp->pr_sctp_on) {
7539                 sctp_set_prsctp_policy(sp);
7540                 asoc->pr_sctp_cnt++;
7541                 chk->pr_sctp_on = 1;
7542         } else {
7543                 chk->pr_sctp_on = 0;
7544         }
7545         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7546                 /* All done pull and kill the message */
7547                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7548                 if (sp->put_last_out == 0) {
7549                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7550                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7551                             sp->sender_all_done,
7552                             sp->length,
7553                             sp->msg_is_complete,
7554                             sp->put_last_out,
7555                             send_lock_up);
7556                 }
7557                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7558                         SCTP_TCB_SEND_LOCK(stcb);
7559                         send_lock_up = 1;
7560                 }
7561                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7562                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7563                 if (sp->net) {
7564                         sctp_free_remote_addr(sp->net);
7565                         sp->net = NULL;
7566                 }
7567                 if (sp->data) {
7568                         sctp_m_freem(sp->data);
7569                         sp->data = NULL;
7570                 }
7571                 sctp_free_a_strmoq(stcb, sp, so_locked);
7572
7573                 /* we can't be locked to it */
7574                 *locked = 0;
7575                 stcb->asoc.locked_on_sending = NULL;
7576         } else {
7577                 /* more to go, we are locked */
7578                 *locked = 1;
7579         }
7580         asoc->chunks_on_out_queue++;
7581         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7582         asoc->send_queue_cnt++;
7583 out_of:
7584         if (send_lock_up) {
7585                 SCTP_TCB_SEND_UNLOCK(stcb);
7586                 send_lock_up = 0;
7587         }
7588         return (to_move);
7589 }
7590
7591
7592 static void
7593 sctp_fill_outqueue(struct sctp_tcb *stcb,
7594     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7595 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7596     SCTP_UNUSED
7597 #endif
7598 )
7599 {
7600         struct sctp_association *asoc;
7601         struct sctp_stream_out *strq, *strqn;
7602         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7603         int locked, giveup;
7604
7605         SCTP_TCB_LOCK_ASSERT(stcb);
7606         asoc = &stcb->asoc;
7607 #ifdef INET6
7608         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
7609                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7610         } else {
7611                 /* ?? not sure what else to do */
7612                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7613         }
7614 #else
7615         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7616 #endif
7617         /* Need an allowance for the data chunk header too */
7618         goal_mtu -= sizeof(struct sctp_data_chunk);
7619
7620         /* must make even word boundary */
7621         goal_mtu &= 0xfffffffc;
7622         if (asoc->locked_on_sending) {
7623                 /* We are stuck on one stream until the message completes. */
7624                 strq = asoc->locked_on_sending;
7625                 locked = 1;
7626         } else {
7627                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7628                 locked = 0;
7629         }
7630         strqn = strq;
7631         while ((goal_mtu > 0) && strq) {
7632                 giveup = 0;
7633                 bail = 0;
7634                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7635                     &giveup, eeor_mode, &bail, so_locked);
7636                 if (moved_how_much)
7637                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7638
7639                 if (locked) {
7640                         asoc->locked_on_sending = strq;
7641                         if ((moved_how_much == 0) || (giveup) || bail)
7642                                 /* no more to move for now */
7643                                 break;
7644                 } else {
7645                         asoc->locked_on_sending = NULL;
7646                         if ((giveup) || bail) {
7647                                 break;
7648                         }
7649                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7650                         if (strq == NULL) {
7651                                 break;
7652                         }
7653                 }
7654                 total_moved += moved_how_much;
7655                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7656                 goal_mtu &= 0xfffffffc;
7657         }
7658         if (bail)
7659                 *quit_now = 1;
7660
7661         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7662
7663         if (total_moved == 0) {
7664                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7665                     (net == stcb->asoc.primary_destination)) {
7666                         /* ran dry for primary network net */
7667                         SCTP_STAT_INCR(sctps_primary_randry);
7668                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7669                         /* ran dry with CMT on */
7670                         SCTP_STAT_INCR(sctps_cmt_randry);
7671                 }
7672         }
7673 }
7674
7675 void
7676 sctp_fix_ecn_echo(struct sctp_association *asoc)
7677 {
7678         struct sctp_tmit_chunk *chk;
7679
7680         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7681                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7682                         chk->sent = SCTP_DATAGRAM_UNSENT;
7683                 }
7684         }
7685 }
7686
7687 void
7688 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7689 {
7690         struct sctp_association *asoc;
7691         struct sctp_tmit_chunk *chk;
7692         struct sctp_stream_queue_pending *sp;
7693         unsigned int i;
7694
7695         if (net == NULL) {
7696                 return;
7697         }
7698         asoc = &stcb->asoc;
7699         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7700                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7701                         if (sp->net == net) {
7702                                 sctp_free_remote_addr(sp->net);
7703                                 sp->net = NULL;
7704                         }
7705                 }
7706         }
7707         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7708                 if (chk->whoTo == net) {
7709                         sctp_free_remote_addr(chk->whoTo);
7710                         chk->whoTo = NULL;
7711                 }
7712         }
7713 }
7714
7715 int
7716 sctp_med_chunk_output(struct sctp_inpcb *inp,
7717     struct sctp_tcb *stcb,
7718     struct sctp_association *asoc,
7719     int *num_out,
7720     int *reason_code,
7721     int control_only, int from_where,
7722     struct timeval *now, int *now_filled, int frag_point, int so_locked
7723 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7724     SCTP_UNUSED
7725 #endif
7726 )
7727 {
7728         /*
7729          * Ok this is the generic chunk service queue. we must do the
7730          * following: - Service the stream queue that is next, moving any
7731          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7732          * LAST to the out queue in one pass) and assigning TSN's - Check to
7733          * see if the cwnd/rwnd allows any output, if so we go ahead and
7734          * fomulate and send the low level chunks. Making sure to combine
7735          * any control in the control chunk queue also.
7736          */
7737         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7738         struct mbuf *outchain, *endoutchain;
7739         struct sctp_tmit_chunk *chk, *nchk;
7740
7741         /* temp arrays for unlinking */
7742         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7743         int no_fragmentflg, error;
7744         unsigned int max_rwnd_per_dest, max_send_per_dest;
7745         int one_chunk, hbflag, skip_data_for_this_net;
7746         int asconf, cookie, no_out_cnt;
7747         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7748         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7749         int tsns_sent = 0;
7750         uint32_t auth_offset = 0;
7751         struct sctp_auth_chunk *auth = NULL;
7752         uint16_t auth_keyid;
7753         int override_ok = 1;
7754         int skip_fill_up = 0;
7755         int data_auth_reqd = 0;
7756
7757         /*
7758          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7759          * destination.
7760          */
7761         int quit_now = 0;
7762
7763         *num_out = 0;
7764         auth_keyid = stcb->asoc.authinfo.active_keyid;
7765
7766         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7767             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7768             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7769                 eeor_mode = 1;
7770         } else {
7771                 eeor_mode = 0;
7772         }
7773         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7774         /*
7775          * First lets prime the pump. For each destination, if there is room
7776          * in the flight size, attempt to pull an MTU's worth out of the
7777          * stream queues into the general send_queue
7778          */
7779 #ifdef SCTP_AUDITING_ENABLED
7780         sctp_audit_log(0xC2, 2);
7781 #endif
7782         SCTP_TCB_LOCK_ASSERT(stcb);
7783         hbflag = 0;
7784         if ((control_only) || (asoc->stream_reset_outstanding))
7785                 no_data_chunks = 1;
7786         else
7787                 no_data_chunks = 0;
7788
7789         /* Nothing to possible to send? */
7790         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7791             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7792             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7793             TAILQ_EMPTY(&asoc->send_queue) &&
7794             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7795 nothing_to_send:
7796                 *reason_code = 9;
7797                 return (0);
7798         }
7799         if (asoc->peers_rwnd == 0) {
7800                 /* No room in peers rwnd */
7801                 *reason_code = 1;
7802                 if (asoc->total_flight > 0) {
7803                         /* we are allowed one chunk in flight */
7804                         no_data_chunks = 1;
7805                 }
7806         }
7807         if (stcb->asoc.ecn_echo_cnt_onq) {
7808                 /* Record where a sack goes, if any */
7809                 if (no_data_chunks &&
7810                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7811                         /* Nothing but ECNe to send - we don't do that */
7812                         goto nothing_to_send;
7813                 }
7814                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7815                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7816                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7817                                 sack_goes_to = chk->whoTo;
7818                                 break;
7819                         }
7820                 }
7821         }
7822         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7823         if (stcb->sctp_socket)
7824                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7825         else
7826                 max_send_per_dest = 0;
7827         if (no_data_chunks == 0) {
7828                 /* How many non-directed chunks are there? */
7829                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7830                         if (chk->whoTo == NULL) {
7831                                 /*
7832                                  * We already have non-directed chunks on
7833                                  * the queue, no need to do a fill-up.
7834                                  */
7835                                 skip_fill_up = 1;
7836                                 break;
7837                         }
7838                 }
7839
7840         }
7841         if ((no_data_chunks == 0) &&
7842             (skip_fill_up == 0) &&
7843             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7844                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7845                         /*
7846                          * This for loop we are in takes in each net, if
7847                          * its's got space in cwnd and has data sent to it
7848                          * (when CMT is off) then it calls
7849                          * sctp_fill_outqueue for the net. This gets data on
7850                          * the send queue for that network.
7851                          *
7852                          * In sctp_fill_outqueue TSN's are assigned and data is
7853                          * copied out of the stream buffers. Note mostly
7854                          * copy by reference (we hope).
7855                          */
7856                         net->window_probe = 0;
7857                         if ((net != stcb->asoc.alternate) &&
7858                             ((net->dest_state & SCTP_ADDR_PF) ||
7859                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7860                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7861                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7862                                         sctp_log_cwnd(stcb, net, 1,
7863                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7864                                 }
7865                                 continue;
7866                         }
7867                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7868                             (net->flight_size == 0)) {
7869                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7870                         }
7871                         if (net->flight_size >= net->cwnd) {
7872                                 /* skip this network, no room - can't fill */
7873                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7874                                         sctp_log_cwnd(stcb, net, 3,
7875                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7876                                 }
7877                                 continue;
7878                         }
7879                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7880                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7881                         }
7882                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7883                         if (quit_now) {
7884                                 /* memory alloc failure */
7885                                 no_data_chunks = 1;
7886                                 break;
7887                         }
7888                 }
7889         }
7890         /* now service each destination and send out what we can for it */
7891         /* Nothing to send? */
7892         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7893             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7894             TAILQ_EMPTY(&asoc->send_queue)) {
7895                 *reason_code = 8;
7896                 return (0);
7897         }
7898         if (asoc->sctp_cmt_on_off > 0) {
7899                 /* get the last start point */
7900                 start_at = asoc->last_net_cmt_send_started;
7901                 if (start_at == NULL) {
7902                         /* null so to beginning */
7903                         start_at = TAILQ_FIRST(&asoc->nets);
7904                 } else {
7905                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7906                         if (start_at == NULL) {
7907                                 start_at = TAILQ_FIRST(&asoc->nets);
7908                         }
7909                 }
7910                 asoc->last_net_cmt_send_started = start_at;
7911         } else {
7912                 start_at = TAILQ_FIRST(&asoc->nets);
7913         }
7914         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7915                 if (chk->whoTo == NULL) {
7916                         if (asoc->alternate) {
7917                                 chk->whoTo = asoc->alternate;
7918                         } else {
7919                                 chk->whoTo = asoc->primary_destination;
7920                         }
7921                         atomic_add_int(&chk->whoTo->ref_count, 1);
7922                 }
7923         }
7924         old_start_at = NULL;
7925 again_one_more_time:
7926         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7927                 /* how much can we send? */
7928                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7929                 if (old_start_at && (old_start_at == net)) {
7930                         /* through list ocmpletely. */
7931                         break;
7932                 }
7933                 tsns_sent = 0xa;
7934                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7935                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7936                     (net->flight_size >= net->cwnd)) {
7937                         /*
7938                          * Nothing on control or asconf and flight is full,
7939                          * we can skip even in the CMT case.
7940                          */
7941                         continue;
7942                 }
7943                 ctl_cnt = bundle_at = 0;
7944                 endoutchain = outchain = NULL;
7945                 no_fragmentflg = 1;
7946                 one_chunk = 0;
7947                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7948                         skip_data_for_this_net = 1;
7949                 } else {
7950                         skip_data_for_this_net = 0;
7951                 }
7952                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7953                         /*
7954                          * if we have a route and an ifp check to see if we
7955                          * have room to send to this guy
7956                          */
7957                         struct ifnet *ifp;
7958
7959                         ifp = net->ro.ro_rt->rt_ifp;
7960                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7961                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7962                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7963                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7964                                 }
7965                                 continue;
7966                         }
7967                 }
7968                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7969 #ifdef INET
7970                 case AF_INET:
7971                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7972                         break;
7973 #endif
7974 #ifdef INET6
7975                 case AF_INET6:
7976                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7977                         break;
7978 #endif
7979                 default:
7980                         /* TSNH */
7981                         mtu = net->mtu;
7982                         break;
7983                 }
7984                 mx_mtu = mtu;
7985                 to_out = 0;
7986                 if (mtu > asoc->peers_rwnd) {
7987                         if (asoc->total_flight > 0) {
7988                                 /* We have a packet in flight somewhere */
7989                                 r_mtu = asoc->peers_rwnd;
7990                         } else {
7991                                 /* We are always allowed to send one MTU out */
7992                                 one_chunk = 1;
7993                                 r_mtu = mtu;
7994                         }
7995                 } else {
7996                         r_mtu = mtu;
7997                 }
7998                 /************************/
7999                 /* ASCONF transmission */
8000                 /************************/
8001                 /* Now first lets go through the asconf queue */
8002                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8003                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8004                                 continue;
8005                         }
8006                         if (chk->whoTo == NULL) {
8007                                 if (asoc->alternate == NULL) {
8008                                         if (asoc->primary_destination != net) {
8009                                                 break;
8010                                         }
8011                                 } else {
8012                                         if (asoc->alternate != net) {
8013                                                 break;
8014                                         }
8015                                 }
8016                         } else {
8017                                 if (chk->whoTo != net) {
8018                                         break;
8019                                 }
8020                         }
8021                         if (chk->data == NULL) {
8022                                 break;
8023                         }
8024                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8025                             chk->sent != SCTP_DATAGRAM_RESEND) {
8026                                 break;
8027                         }
8028                         /*
8029                          * if no AUTH is yet included and this chunk
8030                          * requires it, make sure to account for it.  We
8031                          * don't apply the size until the AUTH chunk is
8032                          * actually added below in case there is no room for
8033                          * this chunk. NOTE: we overload the use of "omtu"
8034                          * here
8035                          */
8036                         if ((auth == NULL) &&
8037                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8038                             stcb->asoc.peer_auth_chunks)) {
8039                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8040                         } else
8041                                 omtu = 0;
8042                         /* Here we do NOT factor the r_mtu */
8043                         if ((chk->send_size < (int)(mtu - omtu)) ||
8044                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8045                                 /*
8046                                  * We probably should glom the mbuf chain
8047                                  * from the chk->data for control but the
8048                                  * problem is it becomes yet one more level
8049                                  * of tracking to do if for some reason
8050                                  * output fails. Then I have got to
8051                                  * reconstruct the merged control chain.. el
8052                                  * yucko.. for now we take the easy way and
8053                                  * do the copy
8054                                  */
8055                                 /*
8056                                  * Add an AUTH chunk, if chunk requires it
8057                                  * save the offset into the chain for AUTH
8058                                  */
8059                                 if ((auth == NULL) &&
8060                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8061                                     stcb->asoc.peer_auth_chunks))) {
8062                                         outchain = sctp_add_auth_chunk(outchain,
8063                                             &endoutchain,
8064                                             &auth,
8065                                             &auth_offset,
8066                                             stcb,
8067                                             chk->rec.chunk_id.id);
8068                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8069                                 }
8070                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8071                                     (int)chk->rec.chunk_id.can_take_data,
8072                                     chk->send_size, chk->copy_by_ref);
8073                                 if (outchain == NULL) {
8074                                         *reason_code = 8;
8075                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8076                                         return (ENOMEM);
8077                                 }
8078                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8079                                 /* update our MTU size */
8080                                 if (mtu > (chk->send_size + omtu))
8081                                         mtu -= (chk->send_size + omtu);
8082                                 else
8083                                         mtu = 0;
8084                                 to_out += (chk->send_size + omtu);
8085                                 /* Do clear IP_DF ? */
8086                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8087                                         no_fragmentflg = 0;
8088                                 }
8089                                 if (chk->rec.chunk_id.can_take_data)
8090                                         chk->data = NULL;
8091                                 /*
8092                                  * set hb flag since we can use these for
8093                                  * RTO
8094                                  */
8095                                 hbflag = 1;
8096                                 asconf = 1;
8097                                 /*
8098                                  * should sysctl this: don't bundle data
8099                                  * with ASCONF since it requires AUTH
8100                                  */
8101                                 no_data_chunks = 1;
8102                                 chk->sent = SCTP_DATAGRAM_SENT;
8103                                 if (chk->whoTo == NULL) {
8104                                         chk->whoTo = net;
8105                                         atomic_add_int(&net->ref_count, 1);
8106                                 }
8107                                 chk->snd_count++;
8108                                 if (mtu == 0) {
8109                                         /*
8110                                          * Ok we are out of room but we can
8111                                          * output without effecting the
8112                                          * flight size since this little guy
8113                                          * is a control only packet.
8114                                          */
8115                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8116                                         /*
8117                                          * do NOT clear the asconf flag as
8118                                          * it is used to do appropriate
8119                                          * source address selection.
8120                                          */
8121                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8122                                             (struct sockaddr *)&net->ro._l_addr,
8123                                             outchain, auth_offset, auth,
8124                                             stcb->asoc.authinfo.active_keyid,
8125                                             no_fragmentflg, 0, NULL, asconf,
8126                                             inp->sctp_lport, stcb->rport,
8127                                             htonl(stcb->asoc.peer_vtag),
8128                                             net->port, so_locked, NULL, NULL))) {
8129                                                 if (error == ENOBUFS) {
8130                                                         asoc->ifp_had_enobuf = 1;
8131                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8132                                                 }
8133                                                 if (from_where == 0) {
8134                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8135                                                 }
8136                                                 if (*now_filled == 0) {
8137                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8138                                                         *now_filled = 1;
8139                                                         *now = net->last_sent_time;
8140                                                 } else {
8141                                                         net->last_sent_time = *now;
8142                                                 }
8143                                                 hbflag = 0;
8144                                                 /* error, could not output */
8145                                                 if (error == EHOSTUNREACH) {
8146                                                         /*
8147                                                          * Destination went
8148                                                          * unreachable
8149                                                          * during this send
8150                                                          */
8151                                                         sctp_move_chunks_from_net(stcb, net);
8152                                                 }
8153                                                 *reason_code = 7;
8154                                                 continue;
8155                                         } else
8156                                                 asoc->ifp_had_enobuf = 0;
8157                                         if (*now_filled == 0) {
8158                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8159                                                 *now_filled = 1;
8160                                                 *now = net->last_sent_time;
8161                                         } else {
8162                                                 net->last_sent_time = *now;
8163                                         }
8164                                         hbflag = 0;
8165                                         /*
8166                                          * increase the number we sent, if a
8167                                          * cookie is sent we don't tell them
8168                                          * any was sent out.
8169                                          */
8170                                         outchain = endoutchain = NULL;
8171                                         auth = NULL;
8172                                         auth_offset = 0;
8173                                         if (!no_out_cnt)
8174                                                 *num_out += ctl_cnt;
8175                                         /* recalc a clean slate and setup */
8176                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8177                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8178                                         } else {
8179                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8180                                         }
8181                                         to_out = 0;
8182                                         no_fragmentflg = 1;
8183                                 }
8184                         }
8185                 }
8186                 /************************/
8187                 /* Control transmission */
8188                 /************************/
8189                 /* Now first lets go through the control queue */
8190                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8191                         if ((sack_goes_to) &&
8192                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8193                             (chk->whoTo != sack_goes_to)) {
8194                                 /*
8195                                  * if we have a sack in queue, and we are
8196                                  * looking at an ecn echo that is NOT queued
8197                                  * to where the sack is going..
8198                                  */
8199                                 if (chk->whoTo == net) {
8200                                         /*
8201                                          * Don't transmit it to where its
8202                                          * going (current net)
8203                                          */
8204                                         continue;
8205                                 } else if (sack_goes_to == net) {
8206                                         /*
8207                                          * But do transmit it to this
8208                                          * address
8209                                          */
8210                                         goto skip_net_check;
8211                                 }
8212                         }
8213                         if (chk->whoTo == NULL) {
8214                                 if (asoc->alternate == NULL) {
8215                                         if (asoc->primary_destination != net) {
8216                                                 continue;
8217                                         }
8218                                 } else {
8219                                         if (asoc->alternate != net) {
8220                                                 continue;
8221                                         }
8222                                 }
8223                         } else {
8224                                 if (chk->whoTo != net) {
8225                                         continue;
8226                                 }
8227                         }
8228         skip_net_check:
8229                         if (chk->data == NULL) {
8230                                 continue;
8231                         }
8232                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8233                                 /*
8234                                  * It must be unsent. Cookies and ASCONF's
8235                                  * hang around but there timers will force
8236                                  * when marked for resend.
8237                                  */
8238                                 continue;
8239                         }
8240                         /*
8241                          * if no AUTH is yet included and this chunk
8242                          * requires it, make sure to account for it.  We
8243                          * don't apply the size until the AUTH chunk is
8244                          * actually added below in case there is no room for
8245                          * this chunk. NOTE: we overload the use of "omtu"
8246                          * here
8247                          */
8248                         if ((auth == NULL) &&
8249                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8250                             stcb->asoc.peer_auth_chunks)) {
8251                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8252                         } else
8253                                 omtu = 0;
8254                         /* Here we do NOT factor the r_mtu */
8255                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8256                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8257                                 /*
8258                                  * We probably should glom the mbuf chain
8259                                  * from the chk->data for control but the
8260                                  * problem is it becomes yet one more level
8261                                  * of tracking to do if for some reason
8262                                  * output fails. Then I have got to
8263                                  * reconstruct the merged control chain.. el
8264                                  * yucko.. for now we take the easy way and
8265                                  * do the copy
8266                                  */
8267                                 /*
8268                                  * Add an AUTH chunk, if chunk requires it
8269                                  * save the offset into the chain for AUTH
8270                                  */
8271                                 if ((auth == NULL) &&
8272                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8273                                     stcb->asoc.peer_auth_chunks))) {
8274                                         outchain = sctp_add_auth_chunk(outchain,
8275                                             &endoutchain,
8276                                             &auth,
8277                                             &auth_offset,
8278                                             stcb,
8279                                             chk->rec.chunk_id.id);
8280                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8281                                 }
8282                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8283                                     (int)chk->rec.chunk_id.can_take_data,
8284                                     chk->send_size, chk->copy_by_ref);
8285                                 if (outchain == NULL) {
8286                                         *reason_code = 8;
8287                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8288                                         return (ENOMEM);
8289                                 }
8290                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8291                                 /* update our MTU size */
8292                                 if (mtu > (chk->send_size + omtu))
8293                                         mtu -= (chk->send_size + omtu);
8294                                 else
8295                                         mtu = 0;
8296                                 to_out += (chk->send_size + omtu);
8297                                 /* Do clear IP_DF ? */
8298                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8299                                         no_fragmentflg = 0;
8300                                 }
8301                                 if (chk->rec.chunk_id.can_take_data)
8302                                         chk->data = NULL;
8303                                 /* Mark things to be removed, if needed */
8304                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8305                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8306                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8307                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8308                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8309                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8310                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8311                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8312                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8313                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8314                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8315                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8316                                                 hbflag = 1;
8317                                         }
8318                                         /* remove these chunks at the end */
8319                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8320                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8321                                                 /* turn off the timer */
8322                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8323                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8324                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8325                                                 }
8326                                         }
8327                                         ctl_cnt++;
8328                                 } else {
8329                                         /*
8330                                          * Other chunks, since they have
8331                                          * timers running (i.e. COOKIE) we
8332                                          * just "trust" that it gets sent or
8333                                          * retransmitted.
8334                                          */
8335                                         ctl_cnt++;
8336                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8337                                                 cookie = 1;
8338                                                 no_out_cnt = 1;
8339                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8340                                                 /*
8341                                                  * Increment ecne send count
8342                                                  * here this means we may be
8343                                                  * over-zealous in our
8344                                                  * counting if the send
8345                                                  * fails, but its the best
8346                                                  * place to do it (we used
8347                                                  * to do it in the queue of
8348                                                  * the chunk, but that did
8349                                                  * not tell how many times
8350                                                  * it was sent.
8351                                                  */
8352                                                 SCTP_STAT_INCR(sctps_sendecne);
8353                                         }
8354                                         chk->sent = SCTP_DATAGRAM_SENT;
8355                                         if (chk->whoTo == NULL) {
8356                                                 chk->whoTo = net;
8357                                                 atomic_add_int(&net->ref_count, 1);
8358                                         }
8359                                         chk->snd_count++;
8360                                 }
8361                                 if (mtu == 0) {
8362                                         /*
8363                                          * Ok we are out of room but we can
8364                                          * output without effecting the
8365                                          * flight size since this little guy
8366                                          * is a control only packet.
8367                                          */
8368                                         if (asconf) {
8369                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8370                                                 /*
8371                                                  * do NOT clear the asconf
8372                                                  * flag as it is used to do
8373                                                  * appropriate source
8374                                                  * address selection.
8375                                                  */
8376                                         }
8377                                         if (cookie) {
8378                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8379                                                 cookie = 0;
8380                                         }
8381                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8382                                             (struct sockaddr *)&net->ro._l_addr,
8383                                             outchain,
8384                                             auth_offset, auth,
8385                                             stcb->asoc.authinfo.active_keyid,
8386                                             no_fragmentflg, 0, NULL, asconf,
8387                                             inp->sctp_lport, stcb->rport,
8388                                             htonl(stcb->asoc.peer_vtag),
8389                                             net->port, so_locked, NULL, NULL))) {
8390                                                 if (error == ENOBUFS) {
8391                                                         asoc->ifp_had_enobuf = 1;
8392                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8393                                                 }
8394                                                 if (from_where == 0) {
8395                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8396                                                 }
8397                                                 /* error, could not output */
8398                                                 if (hbflag) {
8399                                                         if (*now_filled == 0) {
8400                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8401                                                                 *now_filled = 1;
8402                                                                 *now = net->last_sent_time;
8403                                                         } else {
8404                                                                 net->last_sent_time = *now;
8405                                                         }
8406                                                         hbflag = 0;
8407                                                 }
8408                                                 if (error == EHOSTUNREACH) {
8409                                                         /*
8410                                                          * Destination went
8411                                                          * unreachable
8412                                                          * during this send
8413                                                          */
8414                                                         sctp_move_chunks_from_net(stcb, net);
8415                                                 }
8416                                                 *reason_code = 7;
8417                                                 continue;
8418                                         } else
8419                                                 asoc->ifp_had_enobuf = 0;
8420                                         /* Only HB or ASCONF advances time */
8421                                         if (hbflag) {
8422                                                 if (*now_filled == 0) {
8423                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8424                                                         *now_filled = 1;
8425                                                         *now = net->last_sent_time;
8426                                                 } else {
8427                                                         net->last_sent_time = *now;
8428                                                 }
8429                                                 hbflag = 0;
8430                                         }
8431                                         /*
8432                                          * increase the number we sent, if a
8433                                          * cookie is sent we don't tell them
8434                                          * any was sent out.
8435                                          */
8436                                         outchain = endoutchain = NULL;
8437                                         auth = NULL;
8438                                         auth_offset = 0;
8439                                         if (!no_out_cnt)
8440                                                 *num_out += ctl_cnt;
8441                                         /* recalc a clean slate and setup */
8442                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8443                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8444                                         } else {
8445                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8446                                         }
8447                                         to_out = 0;
8448                                         no_fragmentflg = 1;
8449                                 }
8450                         }
8451                 }
8452                 /* JRI: if dest is in PF state, do not send data to it */
8453                 if ((asoc->sctp_cmt_on_off > 0) &&
8454                     (net != stcb->asoc.alternate) &&
8455                     (net->dest_state & SCTP_ADDR_PF)) {
8456                         goto no_data_fill;
8457                 }
8458                 if (net->flight_size >= net->cwnd) {
8459                         goto no_data_fill;
8460                 }
8461                 if ((asoc->sctp_cmt_on_off > 0) &&
8462                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8463                     (net->flight_size > max_rwnd_per_dest)) {
8464                         goto no_data_fill;
8465                 }
8466                 /*
8467                  * We need a specific accounting for the usage of the send
8468                  * buffer. We also need to check the number of messages per
8469                  * net. For now, this is better than nothing and it disabled
8470                  * by default...
8471                  */
8472                 if ((asoc->sctp_cmt_on_off > 0) &&
8473                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8474                     (max_send_per_dest > 0) &&
8475                     (net->flight_size > max_send_per_dest)) {
8476                         goto no_data_fill;
8477                 }
8478                 /*********************/
8479                 /* Data transmission */
8480                 /*********************/
8481                 /*
8482                  * if AUTH for DATA is required and no AUTH has been added
8483                  * yet, account for this in the mtu now... if no data can be
8484                  * bundled, this adjustment won't matter anyways since the
8485                  * packet will be going out...
8486                  */
8487                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8488                     stcb->asoc.peer_auth_chunks);
8489                 if (data_auth_reqd && (auth == NULL)) {
8490                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8491                 }
8492                 /* now lets add any data within the MTU constraints */
8493                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8494                 case AF_INET:
8495                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8496                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8497                         else
8498                                 omtu = 0;
8499                         break;
8500 #ifdef INET6
8501                 case AF_INET6:
8502                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8503                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8504                         else
8505                                 omtu = 0;
8506                         break;
8507 #endif
8508                 default:
8509                         /* TSNH */
8510                         omtu = 0;
8511                         break;
8512                 }
8513                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8514                     (skip_data_for_this_net == 0)) ||
8515                     (cookie)) {
8516                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8517                                 if (no_data_chunks) {
8518                                         /* let only control go out */
8519                                         *reason_code = 1;
8520                                         break;
8521                                 }
8522                                 if (net->flight_size >= net->cwnd) {
8523                                         /* skip this net, no room for data */
8524                                         *reason_code = 2;
8525                                         break;
8526                                 }
8527                                 if ((chk->whoTo != NULL) &&
8528                                     (chk->whoTo != net)) {
8529                                         /* Don't send the chunk on this net */
8530                                         continue;
8531                                 }
8532                                 if (asoc->sctp_cmt_on_off == 0) {
8533                                         if ((asoc->alternate) &&
8534                                             (asoc->alternate != net) &&
8535                                             (chk->whoTo == NULL)) {
8536                                                 continue;
8537                                         } else if ((net != asoc->primary_destination) &&
8538                                                     (asoc->alternate == NULL) &&
8539                                             (chk->whoTo == NULL)) {
8540                                                 continue;
8541                                         }
8542                                 }
8543                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8544                                         /*-
8545                                          * strange, we have a chunk that is
8546                                          * to big for its destination and
8547                                          * yet no fragment ok flag.
8548                                          * Something went wrong when the
8549                                          * PMTU changed...we did not mark
8550                                          * this chunk for some reason?? I
8551                                          * will fix it here by letting IP
8552                                          * fragment it for now and printing
8553                                          * a warning. This really should not
8554                                          * happen ...
8555                                          */
8556                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8557                                             chk->send_size, mtu);
8558                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8559                                 }
8560                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8561                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8562                                         struct sctp_data_chunk *dchkh;
8563
8564                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8565                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8566                                 }
8567                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8568                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8569                                         /* ok we will add this one */
8570
8571                                         /*
8572                                          * Add an AUTH chunk, if chunk
8573                                          * requires it, save the offset into
8574                                          * the chain for AUTH
8575                                          */
8576                                         if (data_auth_reqd) {
8577                                                 if (auth == NULL) {
8578                                                         outchain = sctp_add_auth_chunk(outchain,
8579                                                             &endoutchain,
8580                                                             &auth,
8581                                                             &auth_offset,
8582                                                             stcb,
8583                                                             SCTP_DATA);
8584                                                         auth_keyid = chk->auth_keyid;
8585                                                         override_ok = 0;
8586                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8587                                                 } else if (override_ok) {
8588                                                         /*
8589                                                          * use this data's
8590                                                          * keyid
8591                                                          */
8592                                                         auth_keyid = chk->auth_keyid;
8593                                                         override_ok = 0;
8594                                                 } else if (auth_keyid != chk->auth_keyid) {
8595                                                         /*
8596                                                          * different keyid,
8597                                                          * so done bundling
8598                                                          */
8599                                                         break;
8600                                                 }
8601                                         }
8602                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8603                                             chk->send_size, chk->copy_by_ref);
8604                                         if (outchain == NULL) {
8605                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8606                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8607                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8608                                                 }
8609                                                 *reason_code = 3;
8610                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8611                                                 return (ENOMEM);
8612                                         }
8613                                         /* upate our MTU size */
8614                                         /* Do clear IP_DF ? */
8615                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8616                                                 no_fragmentflg = 0;
8617                                         }
8618                                         /* unsigned subtraction of mtu */
8619                                         if (mtu > chk->send_size)
8620                                                 mtu -= chk->send_size;
8621                                         else
8622                                                 mtu = 0;
8623                                         /* unsigned subtraction of r_mtu */
8624                                         if (r_mtu > chk->send_size)
8625                                                 r_mtu -= chk->send_size;
8626                                         else
8627                                                 r_mtu = 0;
8628
8629                                         to_out += chk->send_size;
8630                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8631 #ifdef INVARIANTS
8632                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8633 #else
8634                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8635                                                     mx_mtu, to_out);
8636 #endif
8637                                         }
8638                                         chk->window_probe = 0;
8639                                         data_list[bundle_at++] = chk;
8640                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8641                                                 mtu = 0;
8642                                                 break;
8643                                         }
8644                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8645                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8646                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8647                                                 } else {
8648                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8649                                                 }
8650                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8651                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8652                                                         /*
8653                                                          * Count number of
8654                                                          * user msg's that
8655                                                          * were fragmented
8656                                                          * we do this by
8657                                                          * counting when we
8658                                                          * see a LAST
8659                                                          * fragment only.
8660                                                          */
8661                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8662                                         }
8663                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8664                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8665                                                         data_list[0]->window_probe = 1;
8666                                                         net->window_probe = 1;
8667                                                 }
8668                                                 break;
8669                                         }
8670                                 } else {
8671                                         /*
8672                                          * Must be sent in order of the
8673                                          * TSN's (on a network)
8674                                          */
8675                                         break;
8676                                 }
8677                         }       /* for (chunk gather loop for this net) */
8678                 }               /* if asoc.state OPEN */
8679 no_data_fill:
8680                 /* Is there something to send for this destination? */
8681                 if (outchain) {
8682                         /* We may need to start a control timer or two */
8683                         if (asconf) {
8684                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8685                                     stcb, net);
8686                                 /*
8687                                  * do NOT clear the asconf flag as it is
8688                                  * used to do appropriate source address
8689                                  * selection.
8690                                  */
8691                         }
8692                         if (cookie) {
8693                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8694                                 cookie = 0;
8695                         }
8696                         /* must start a send timer if data is being sent */
8697                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8698                                 /*
8699                                  * no timer running on this destination
8700                                  * restart it.
8701                                  */
8702                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8703                         }
8704                         /* Now send it, if there is anything to send :> */
8705                         if ((error = sctp_lowlevel_chunk_output(inp,
8706                             stcb,
8707                             net,
8708                             (struct sockaddr *)&net->ro._l_addr,
8709                             outchain,
8710                             auth_offset,
8711                             auth,
8712                             auth_keyid,
8713                             no_fragmentflg,
8714                             bundle_at,
8715                             data_list[0],
8716                             asconf,
8717                             inp->sctp_lport, stcb->rport,
8718                             htonl(stcb->asoc.peer_vtag),
8719                             net->port, so_locked, NULL, NULL))) {
8720                                 /* error, we could not output */
8721                                 if (error == ENOBUFS) {
8722                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8723                                         asoc->ifp_had_enobuf = 1;
8724                                 }
8725                                 if (from_where == 0) {
8726                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8727                                 }
8728                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8729                                 if (hbflag) {
8730                                         if (*now_filled == 0) {
8731                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8732                                                 *now_filled = 1;
8733                                                 *now = net->last_sent_time;
8734                                         } else {
8735                                                 net->last_sent_time = *now;
8736                                         }
8737                                         hbflag = 0;
8738                                 }
8739                                 if (error == EHOSTUNREACH) {
8740                                         /*
8741                                          * Destination went unreachable
8742                                          * during this send
8743                                          */
8744                                         sctp_move_chunks_from_net(stcb, net);
8745                                 }
8746                                 *reason_code = 6;
8747                                 /*-
8748                                  * I add this line to be paranoid. As far as
8749                                  * I can tell the continue, takes us back to
8750                                  * the top of the for, but just to make sure
8751                                  * I will reset these again here.
8752                                  */
8753                                 ctl_cnt = bundle_at = 0;
8754                                 continue;       /* This takes us back to the
8755                                                  * for() for the nets. */
8756                         } else {
8757                                 asoc->ifp_had_enobuf = 0;
8758                         }
8759                         outchain = endoutchain = NULL;
8760                         auth = NULL;
8761                         auth_offset = 0;
8762                         if (bundle_at || hbflag) {
8763                                 /* For data/asconf and hb set time */
8764                                 if (*now_filled == 0) {
8765                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8766                                         *now_filled = 1;
8767                                         *now = net->last_sent_time;
8768                                 } else {
8769                                         net->last_sent_time = *now;
8770                                 }
8771                         }
8772                         if (!no_out_cnt) {
8773                                 *num_out += (ctl_cnt + bundle_at);
8774                         }
8775                         if (bundle_at) {
8776                                 /* setup for a RTO measurement */
8777                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8778                                 /* fill time if not already filled */
8779                                 if (*now_filled == 0) {
8780                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8781                                         *now_filled = 1;
8782                                         *now = asoc->time_last_sent;
8783                                 } else {
8784                                         asoc->time_last_sent = *now;
8785                                 }
8786                                 if (net->rto_needed) {
8787                                         data_list[0]->do_rtt = 1;
8788                                         net->rto_needed = 0;
8789                                 }
8790                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8791                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8792                         }
8793                         if (one_chunk) {
8794                                 break;
8795                         }
8796                 }
8797                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8798                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8799                 }
8800         }
8801         if (old_start_at == NULL) {
8802                 old_start_at = start_at;
8803                 start_at = TAILQ_FIRST(&asoc->nets);
8804                 if (old_start_at)
8805                         goto again_one_more_time;
8806         }
8807         /*
8808          * At the end there should be no NON timed chunks hanging on this
8809          * queue.
8810          */
8811         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8812                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8813         }
8814         if ((*num_out == 0) && (*reason_code == 0)) {
8815                 *reason_code = 4;
8816         } else {
8817                 *reason_code = 5;
8818         }
8819         sctp_clean_up_ctl(stcb, asoc, so_locked);
8820         return (0);
8821 }
8822
8823 void
8824 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8825 {
8826         /*-
8827          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8828          * the control chunk queue.
8829          */
8830         struct sctp_chunkhdr *hdr;
8831         struct sctp_tmit_chunk *chk;
8832         struct mbuf *mat;
8833
8834         SCTP_TCB_LOCK_ASSERT(stcb);
8835         sctp_alloc_a_chunk(stcb, chk);
8836         if (chk == NULL) {
8837                 /* no memory */
8838                 sctp_m_freem(op_err);
8839                 return;
8840         }
8841         chk->copy_by_ref = 0;
8842         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8843         if (op_err == NULL) {
8844                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8845                 return;
8846         }
8847         chk->send_size = 0;
8848         mat = op_err;
8849         while (mat != NULL) {
8850                 chk->send_size += SCTP_BUF_LEN(mat);
8851                 mat = SCTP_BUF_NEXT(mat);
8852         }
8853         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8854         chk->rec.chunk_id.can_take_data = 1;
8855         chk->sent = SCTP_DATAGRAM_UNSENT;
8856         chk->snd_count = 0;
8857         chk->flags = 0;
8858         chk->asoc = &stcb->asoc;
8859         chk->data = op_err;
8860         chk->whoTo = NULL;
8861         hdr = mtod(op_err, struct sctp_chunkhdr *);
8862         hdr->chunk_type = SCTP_OPERATION_ERROR;
8863         hdr->chunk_flags = 0;
8864         hdr->chunk_length = htons(chk->send_size);
8865         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8866             chk,
8867             sctp_next);
8868         chk->asoc->ctrl_queue_cnt++;
8869 }
8870
8871 int
8872 sctp_send_cookie_echo(struct mbuf *m,
8873     int offset,
8874     struct sctp_tcb *stcb,
8875     struct sctp_nets *net)
8876 {
8877         /*-
8878          * pull out the cookie and put it at the front of the control chunk
8879          * queue.
8880          */
8881         int at;
8882         struct mbuf *cookie;
8883         struct sctp_paramhdr parm, *phdr;
8884         struct sctp_chunkhdr *hdr;
8885         struct sctp_tmit_chunk *chk;
8886         uint16_t ptype, plen;
8887
8888         /* First find the cookie in the param area */
8889         cookie = NULL;
8890         at = offset + sizeof(struct sctp_init_chunk);
8891
8892         SCTP_TCB_LOCK_ASSERT(stcb);
8893         do {
8894                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8895                 if (phdr == NULL) {
8896                         return (-3);
8897                 }
8898                 ptype = ntohs(phdr->param_type);
8899                 plen = ntohs(phdr->param_length);
8900                 if (ptype == SCTP_STATE_COOKIE) {
8901                         int pad;
8902
8903                         /* found the cookie */
8904                         if ((pad = (plen % 4))) {
8905                                 plen += 4 - pad;
8906                         }
8907                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8908                         if (cookie == NULL) {
8909                                 /* No memory */
8910                                 return (-2);
8911                         }
8912 #ifdef SCTP_MBUF_LOGGING
8913                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8914                                 struct mbuf *mat;
8915
8916                                 mat = cookie;
8917                                 while (mat) {
8918                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8919                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8920                                         }
8921                                         mat = SCTP_BUF_NEXT(mat);
8922                                 }
8923                         }
8924 #endif
8925                         break;
8926                 }
8927                 at += SCTP_SIZE32(plen);
8928         } while (phdr);
8929         if (cookie == NULL) {
8930                 /* Did not find the cookie */
8931                 return (-3);
8932         }
8933         /* ok, we got the cookie lets change it into a cookie echo chunk */
8934
8935         /* first the change from param to cookie */
8936         hdr = mtod(cookie, struct sctp_chunkhdr *);
8937         hdr->chunk_type = SCTP_COOKIE_ECHO;
8938         hdr->chunk_flags = 0;
8939         /* get the chunk stuff now and place it in the FRONT of the queue */
8940         sctp_alloc_a_chunk(stcb, chk);
8941         if (chk == NULL) {
8942                 /* no memory */
8943                 sctp_m_freem(cookie);
8944                 return (-5);
8945         }
8946         chk->copy_by_ref = 0;
8947         chk->send_size = plen;
8948         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8949         chk->rec.chunk_id.can_take_data = 0;
8950         chk->sent = SCTP_DATAGRAM_UNSENT;
8951         chk->snd_count = 0;
8952         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8953         chk->asoc = &stcb->asoc;
8954         chk->data = cookie;
8955         chk->whoTo = net;
8956         atomic_add_int(&chk->whoTo->ref_count, 1);
8957         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8958         chk->asoc->ctrl_queue_cnt++;
8959         return (0);
8960 }
8961
8962 void
8963 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8964     struct mbuf *m,
8965     int offset,
8966     int chk_length,
8967     struct sctp_nets *net)
8968 {
8969         /*
8970          * take a HB request and make it into a HB ack and send it.
8971          */
8972         struct mbuf *outchain;
8973         struct sctp_chunkhdr *chdr;
8974         struct sctp_tmit_chunk *chk;
8975
8976
8977         if (net == NULL)
8978                 /* must have a net pointer */
8979                 return;
8980
8981         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8982         if (outchain == NULL) {
8983                 /* gak out of memory */
8984                 return;
8985         }
8986 #ifdef SCTP_MBUF_LOGGING
8987         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8988                 struct mbuf *mat;
8989
8990                 mat = outchain;
8991                 while (mat) {
8992                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8993                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8994                         }
8995                         mat = SCTP_BUF_NEXT(mat);
8996                 }
8997         }
8998 #endif
8999         chdr = mtod(outchain, struct sctp_chunkhdr *);
9000         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9001         chdr->chunk_flags = 0;
9002         if (chk_length % 4) {
9003                 /* need pad */
9004                 uint32_t cpthis = 0;
9005                 int padlen;
9006
9007                 padlen = 4 - (chk_length % 4);
9008                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9009         }
9010         sctp_alloc_a_chunk(stcb, chk);
9011         if (chk == NULL) {
9012                 /* no memory */
9013                 sctp_m_freem(outchain);
9014                 return;
9015         }
9016         chk->copy_by_ref = 0;
9017         chk->send_size = chk_length;
9018         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9019         chk->rec.chunk_id.can_take_data = 1;
9020         chk->sent = SCTP_DATAGRAM_UNSENT;
9021         chk->snd_count = 0;
9022         chk->flags = 0;
9023         chk->asoc = &stcb->asoc;
9024         chk->data = outchain;
9025         chk->whoTo = net;
9026         atomic_add_int(&chk->whoTo->ref_count, 1);
9027         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9028         chk->asoc->ctrl_queue_cnt++;
9029 }
9030
9031 void
9032 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9033 {
9034         /* formulate and queue a cookie-ack back to sender */
9035         struct mbuf *cookie_ack;
9036         struct sctp_chunkhdr *hdr;
9037         struct sctp_tmit_chunk *chk;
9038
9039         cookie_ack = NULL;
9040         SCTP_TCB_LOCK_ASSERT(stcb);
9041
9042         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9043         if (cookie_ack == NULL) {
9044                 /* no mbuf's */
9045                 return;
9046         }
9047         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9048         sctp_alloc_a_chunk(stcb, chk);
9049         if (chk == NULL) {
9050                 /* no memory */
9051                 sctp_m_freem(cookie_ack);
9052                 return;
9053         }
9054         chk->copy_by_ref = 0;
9055         chk->send_size = sizeof(struct sctp_chunkhdr);
9056         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9057         chk->rec.chunk_id.can_take_data = 1;
9058         chk->sent = SCTP_DATAGRAM_UNSENT;
9059         chk->snd_count = 0;
9060         chk->flags = 0;
9061         chk->asoc = &stcb->asoc;
9062         chk->data = cookie_ack;
9063         if (chk->asoc->last_control_chunk_from != NULL) {
9064                 chk->whoTo = chk->asoc->last_control_chunk_from;
9065                 atomic_add_int(&chk->whoTo->ref_count, 1);
9066         } else {
9067                 chk->whoTo = NULL;
9068         }
9069         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9070         hdr->chunk_type = SCTP_COOKIE_ACK;
9071         hdr->chunk_flags = 0;
9072         hdr->chunk_length = htons(chk->send_size);
9073         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9074         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9075         chk->asoc->ctrl_queue_cnt++;
9076         return;
9077 }
9078
9079
9080 void
9081 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9082 {
9083         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9084         struct mbuf *m_shutdown_ack;
9085         struct sctp_shutdown_ack_chunk *ack_cp;
9086         struct sctp_tmit_chunk *chk;
9087
9088         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9089         if (m_shutdown_ack == NULL) {
9090                 /* no mbuf's */
9091                 return;
9092         }
9093         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9094         sctp_alloc_a_chunk(stcb, chk);
9095         if (chk == NULL) {
9096                 /* no memory */
9097                 sctp_m_freem(m_shutdown_ack);
9098                 return;
9099         }
9100         chk->copy_by_ref = 0;
9101         chk->send_size = sizeof(struct sctp_chunkhdr);
9102         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9103         chk->rec.chunk_id.can_take_data = 1;
9104         chk->sent = SCTP_DATAGRAM_UNSENT;
9105         chk->snd_count = 0;
9106         chk->flags = 0;
9107         chk->asoc = &stcb->asoc;
9108         chk->data = m_shutdown_ack;
9109         chk->whoTo = net;
9110         if (chk->whoTo) {
9111                 atomic_add_int(&chk->whoTo->ref_count, 1);
9112         }
9113         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9114         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9115         ack_cp->ch.chunk_flags = 0;
9116         ack_cp->ch.chunk_length = htons(chk->send_size);
9117         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9118         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9119         chk->asoc->ctrl_queue_cnt++;
9120         return;
9121 }
9122
9123 void
9124 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9125 {
9126         /* formulate and queue a SHUTDOWN to the sender */
9127         struct mbuf *m_shutdown;
9128         struct sctp_shutdown_chunk *shutdown_cp;
9129         struct sctp_tmit_chunk *chk;
9130
9131         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9132         if (m_shutdown == NULL) {
9133                 /* no mbuf's */
9134                 return;
9135         }
9136         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9137         sctp_alloc_a_chunk(stcb, chk);
9138         if (chk == NULL) {
9139                 /* no memory */
9140                 sctp_m_freem(m_shutdown);
9141                 return;
9142         }
9143         chk->copy_by_ref = 0;
9144         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9145         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9146         chk->rec.chunk_id.can_take_data = 1;
9147         chk->sent = SCTP_DATAGRAM_UNSENT;
9148         chk->snd_count = 0;
9149         chk->flags = 0;
9150         chk->asoc = &stcb->asoc;
9151         chk->data = m_shutdown;
9152         chk->whoTo = net;
9153         if (chk->whoTo) {
9154                 atomic_add_int(&chk->whoTo->ref_count, 1);
9155         }
9156         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9157         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9158         shutdown_cp->ch.chunk_flags = 0;
9159         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9160         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9161         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9162         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9163         chk->asoc->ctrl_queue_cnt++;
9164         return;
9165 }
9166
9167 void
9168 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9169 {
9170         /*
9171          * formulate and queue an ASCONF to the peer. ASCONF parameters
9172          * should be queued on the assoc queue.
9173          */
9174         struct sctp_tmit_chunk *chk;
9175         struct mbuf *m_asconf;
9176         int len;
9177
9178         SCTP_TCB_LOCK_ASSERT(stcb);
9179
9180         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9181             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9182                 /* can't send a new one if there is one in flight already */
9183                 return;
9184         }
9185         /* compose an ASCONF chunk, maximum length is PMTU */
9186         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9187         if (m_asconf == NULL) {
9188                 return;
9189         }
9190         sctp_alloc_a_chunk(stcb, chk);
9191         if (chk == NULL) {
9192                 /* no memory */
9193                 sctp_m_freem(m_asconf);
9194                 return;
9195         }
9196         chk->copy_by_ref = 0;
9197         chk->data = m_asconf;
9198         chk->send_size = len;
9199         chk->rec.chunk_id.id = SCTP_ASCONF;
9200         chk->rec.chunk_id.can_take_data = 0;
9201         chk->sent = SCTP_DATAGRAM_UNSENT;
9202         chk->snd_count = 0;
9203         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9204         chk->asoc = &stcb->asoc;
9205         chk->whoTo = net;
9206         if (chk->whoTo) {
9207                 atomic_add_int(&chk->whoTo->ref_count, 1);
9208         }
9209         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9210         chk->asoc->ctrl_queue_cnt++;
9211         return;
9212 }
9213
9214 void
9215 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9216 {
9217         /*
9218          * formulate and queue a asconf-ack back to sender. the asconf-ack
9219          * must be stored in the tcb.
9220          */
9221         struct sctp_tmit_chunk *chk;
9222         struct sctp_asconf_ack *ack, *latest_ack;
9223         struct mbuf *m_ack, *m;
9224         struct sctp_nets *net = NULL;
9225
9226         SCTP_TCB_LOCK_ASSERT(stcb);
9227         /* Get the latest ASCONF-ACK */
9228         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9229         if (latest_ack == NULL) {
9230                 return;
9231         }
9232         if (latest_ack->last_sent_to != NULL &&
9233             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9234                 /* we're doing a retransmission */
9235                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9236                 if (net == NULL) {
9237                         /* no alternate */
9238                         if (stcb->asoc.last_control_chunk_from == NULL) {
9239                                 if (stcb->asoc.alternate) {
9240                                         net = stcb->asoc.alternate;
9241                                 } else {
9242                                         net = stcb->asoc.primary_destination;
9243                                 }
9244                         } else {
9245                                 net = stcb->asoc.last_control_chunk_from;
9246                         }
9247                 }
9248         } else {
9249                 /* normal case */
9250                 if (stcb->asoc.last_control_chunk_from == NULL) {
9251                         if (stcb->asoc.alternate) {
9252                                 net = stcb->asoc.alternate;
9253                         } else {
9254                                 net = stcb->asoc.primary_destination;
9255                         }
9256                 } else {
9257                         net = stcb->asoc.last_control_chunk_from;
9258                 }
9259         }
9260         latest_ack->last_sent_to = net;
9261
9262         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9263                 if (ack->data == NULL) {
9264                         continue;
9265                 }
9266                 /* copy the asconf_ack */
9267                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9268                 if (m_ack == NULL) {
9269                         /* couldn't copy it */
9270                         return;
9271                 }
9272 #ifdef SCTP_MBUF_LOGGING
9273                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9274                         struct mbuf *mat;
9275
9276                         mat = m_ack;
9277                         while (mat) {
9278                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9279                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9280                                 }
9281                                 mat = SCTP_BUF_NEXT(mat);
9282                         }
9283                 }
9284 #endif
9285
9286                 sctp_alloc_a_chunk(stcb, chk);
9287                 if (chk == NULL) {
9288                         /* no memory */
9289                         if (m_ack)
9290                                 sctp_m_freem(m_ack);
9291                         return;
9292                 }
9293                 chk->copy_by_ref = 0;
9294
9295                 chk->whoTo = net;
9296                 if (chk->whoTo) {
9297                         atomic_add_int(&chk->whoTo->ref_count, 1);
9298                 }
9299                 chk->data = m_ack;
9300                 chk->send_size = 0;
9301                 /* Get size */
9302                 m = m_ack;
9303                 chk->send_size = ack->len;
9304                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9305                 chk->rec.chunk_id.can_take_data = 1;
9306                 chk->sent = SCTP_DATAGRAM_UNSENT;
9307                 chk->snd_count = 0;
9308                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9309                 chk->asoc = &stcb->asoc;
9310
9311                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9312                 chk->asoc->ctrl_queue_cnt++;
9313         }
9314         return;
9315 }
9316
9317
9318 static int
9319 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9320     struct sctp_tcb *stcb,
9321     struct sctp_association *asoc,
9322     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9323 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9324     SCTP_UNUSED
9325 #endif
9326 )
9327 {
9328         /*-
9329          * send out one MTU of retransmission. If fast_retransmit is
9330          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9331          * rwnd. For a Cookie or Asconf in the control chunk queue we
9332          * retransmit them by themselves.
9333          *
9334          * For data chunks we will pick out the lowest TSN's in the sent_queue
9335          * marked for resend and bundle them all together (up to a MTU of
9336          * destination). The address to send to should have been
9337          * selected/changed where the retransmission was marked (i.e. in FR
9338          * or t3-timeout routines).
9339          */
9340         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9341         struct sctp_tmit_chunk *chk, *fwd;
9342         struct mbuf *m, *endofchain;
9343         struct sctp_nets *net = NULL;
9344         uint32_t tsns_sent = 0;
9345         int no_fragmentflg, bundle_at, cnt_thru;
9346         unsigned int mtu;
9347         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9348         struct sctp_auth_chunk *auth = NULL;
9349         uint32_t auth_offset = 0;
9350         uint16_t auth_keyid;
9351         int override_ok = 1;
9352         int data_auth_reqd = 0;
9353         uint32_t dmtu = 0;
9354
9355         SCTP_TCB_LOCK_ASSERT(stcb);
9356         tmr_started = ctl_cnt = bundle_at = error = 0;
9357         no_fragmentflg = 1;
9358         fwd_tsn = 0;
9359         *cnt_out = 0;
9360         fwd = NULL;
9361         endofchain = m = NULL;
9362         auth_keyid = stcb->asoc.authinfo.active_keyid;
9363 #ifdef SCTP_AUDITING_ENABLED
9364         sctp_audit_log(0xC3, 1);
9365 #endif
9366         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9367             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9368                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9369                     asoc->sent_queue_retran_cnt);
9370                 asoc->sent_queue_cnt = 0;
9371                 asoc->sent_queue_cnt_removeable = 0;
9372                 /* send back 0/0 so we enter normal transmission */
9373                 *cnt_out = 0;
9374                 return (0);
9375         }
9376         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9377                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9378                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9379                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9380                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9381                                 continue;
9382                         }
9383                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9384                                 if (chk != asoc->str_reset) {
9385                                         /*
9386                                          * not eligible for retran if its
9387                                          * not ours
9388                                          */
9389                                         continue;
9390                                 }
9391                         }
9392                         ctl_cnt++;
9393                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9394                                 fwd_tsn = 1;
9395                                 fwd = chk;
9396                         }
9397                         /*
9398                          * Add an AUTH chunk, if chunk requires it save the
9399                          * offset into the chain for AUTH
9400                          */
9401                         if ((auth == NULL) &&
9402                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9403                             stcb->asoc.peer_auth_chunks))) {
9404                                 m = sctp_add_auth_chunk(m, &endofchain,
9405                                     &auth, &auth_offset,
9406                                     stcb,
9407                                     chk->rec.chunk_id.id);
9408                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9409                         }
9410                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9411                         break;
9412                 }
9413         }
9414         one_chunk = 0;
9415         cnt_thru = 0;
9416         /* do we have control chunks to retransmit? */
9417         if (m != NULL) {
9418                 /* Start a timer no matter if we suceed or fail */
9419                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9420                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9421                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9422                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9423                 chk->snd_count++;       /* update our count */
9424                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9425                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9426                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9427                     no_fragmentflg, 0, NULL, 0,
9428                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9429                     chk->whoTo->port, so_locked, NULL, NULL))) {
9430                         SCTP_STAT_INCR(sctps_lowlevelerr);
9431                         return (error);
9432                 }
9433                 m = endofchain = NULL;
9434                 auth = NULL;
9435                 auth_offset = 0;
9436                 /*
9437                  * We don't want to mark the net->sent time here since this
9438                  * we use this for HB and retrans cannot measure RTT
9439                  */
9440                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9441                 *cnt_out += 1;
9442                 chk->sent = SCTP_DATAGRAM_SENT;
9443                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9444                 if (fwd_tsn == 0) {
9445                         return (0);
9446                 } else {
9447                         /* Clean up the fwd-tsn list */
9448                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9449                         return (0);
9450                 }
9451         }
9452         /*
9453          * Ok, it is just data retransmission we need to do or that and a
9454          * fwd-tsn with it all.
9455          */
9456         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9457                 return (SCTP_RETRAN_DONE);
9458         }
9459         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9460             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9461                 /* not yet open, resend the cookie and that is it */
9462                 return (1);
9463         }
9464 #ifdef SCTP_AUDITING_ENABLED
9465         sctp_auditing(20, inp, stcb, NULL);
9466 #endif
9467         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9468         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9469                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9470                         /* No, not sent to this net or not ready for rtx */
9471                         continue;
9472                 }
9473                 if (chk->data == NULL) {
9474                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9475                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9476                         continue;
9477                 }
9478                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9479                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9480                         /* Gak, we have exceeded max unlucky retran, abort! */
9481                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9482                             chk->snd_count,
9483                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9484                         atomic_add_int(&stcb->asoc.refcnt, 1);
9485                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9486                         SCTP_TCB_LOCK(stcb);
9487                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9488                         return (SCTP_RETRAN_EXIT);
9489                 }
9490                 /* pick up the net */
9491                 net = chk->whoTo;
9492                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9493                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9494                 } else {
9495                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9496                 }
9497
9498                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9499                         /* No room in peers rwnd */
9500                         uint32_t tsn;
9501
9502                         tsn = asoc->last_acked_seq + 1;
9503                         if (tsn == chk->rec.data.TSN_seq) {
9504                                 /*
9505                                  * we make a special exception for this
9506                                  * case. The peer has no rwnd but is missing
9507                                  * the lowest chunk.. which is probably what
9508                                  * is holding up the rwnd.
9509                                  */
9510                                 goto one_chunk_around;
9511                         }
9512                         return (1);
9513                 }
9514 one_chunk_around:
9515                 if (asoc->peers_rwnd < mtu) {
9516                         one_chunk = 1;
9517                         if ((asoc->peers_rwnd == 0) &&
9518                             (asoc->total_flight == 0)) {
9519                                 chk->window_probe = 1;
9520                                 chk->whoTo->window_probe = 1;
9521                         }
9522                 }
9523 #ifdef SCTP_AUDITING_ENABLED
9524                 sctp_audit_log(0xC3, 2);
9525 #endif
9526                 bundle_at = 0;
9527                 m = NULL;
9528                 net->fast_retran_ip = 0;
9529                 if (chk->rec.data.doing_fast_retransmit == 0) {
9530                         /*
9531                          * if no FR in progress skip destination that have
9532                          * flight_size > cwnd.
9533                          */
9534                         if (net->flight_size >= net->cwnd) {
9535                                 continue;
9536                         }
9537                 } else {
9538                         /*
9539                          * Mark the destination net to have FR recovery
9540                          * limits put on it.
9541                          */
9542                         *fr_done = 1;
9543                         net->fast_retran_ip = 1;
9544                 }
9545
9546                 /*
9547                  * if no AUTH is yet included and this chunk requires it,
9548                  * make sure to account for it.  We don't apply the size
9549                  * until the AUTH chunk is actually added below in case
9550                  * there is no room for this chunk.
9551                  */
9552                 if (data_auth_reqd && (auth == NULL)) {
9553                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9554                 } else
9555                         dmtu = 0;
9556
9557                 if ((chk->send_size <= (mtu - dmtu)) ||
9558                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9559                         /* ok we will add this one */
9560                         if (data_auth_reqd) {
9561                                 if (auth == NULL) {
9562                                         m = sctp_add_auth_chunk(m,
9563                                             &endofchain,
9564                                             &auth,
9565                                             &auth_offset,
9566                                             stcb,
9567                                             SCTP_DATA);
9568                                         auth_keyid = chk->auth_keyid;
9569                                         override_ok = 0;
9570                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9571                                 } else if (override_ok) {
9572                                         auth_keyid = chk->auth_keyid;
9573                                         override_ok = 0;
9574                                 } else if (chk->auth_keyid != auth_keyid) {
9575                                         /* different keyid, so done bundling */
9576                                         break;
9577                                 }
9578                         }
9579                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9580                         if (m == NULL) {
9581                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9582                                 return (ENOMEM);
9583                         }
9584                         /* Do clear IP_DF ? */
9585                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9586                                 no_fragmentflg = 0;
9587                         }
9588                         /* upate our MTU size */
9589                         if (mtu > (chk->send_size + dmtu))
9590                                 mtu -= (chk->send_size + dmtu);
9591                         else
9592                                 mtu = 0;
9593                         data_list[bundle_at++] = chk;
9594                         if (one_chunk && (asoc->total_flight <= 0)) {
9595                                 SCTP_STAT_INCR(sctps_windowprobed);
9596                         }
9597                 }
9598                 if (one_chunk == 0) {
9599                         /*
9600                          * now are there anymore forward from chk to pick
9601                          * up?
9602                          */
9603                         fwd = TAILQ_NEXT(chk, sctp_next);
9604                         while (fwd) {
9605                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9606                                         /* Nope, not for retran */
9607                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9608                                         continue;
9609                                 }
9610                                 if (fwd->whoTo != net) {
9611                                         /* Nope, not the net in question */
9612                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9613                                         continue;
9614                                 }
9615                                 if (data_auth_reqd && (auth == NULL)) {
9616                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9617                                 } else
9618                                         dmtu = 0;
9619                                 if (fwd->send_size <= (mtu - dmtu)) {
9620                                         if (data_auth_reqd) {
9621                                                 if (auth == NULL) {
9622                                                         m = sctp_add_auth_chunk(m,
9623                                                             &endofchain,
9624                                                             &auth,
9625                                                             &auth_offset,
9626                                                             stcb,
9627                                                             SCTP_DATA);
9628                                                         auth_keyid = fwd->auth_keyid;
9629                                                         override_ok = 0;
9630                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9631                                                 } else if (override_ok) {
9632                                                         auth_keyid = fwd->auth_keyid;
9633                                                         override_ok = 0;
9634                                                 } else if (fwd->auth_keyid != auth_keyid) {
9635                                                         /*
9636                                                          * different keyid,
9637                                                          * so done bundling
9638                                                          */
9639                                                         break;
9640                                                 }
9641                                         }
9642                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9643                                         if (m == NULL) {
9644                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9645                                                 return (ENOMEM);
9646                                         }
9647                                         /* Do clear IP_DF ? */
9648                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9649                                                 no_fragmentflg = 0;
9650                                         }
9651                                         /* upate our MTU size */
9652                                         if (mtu > (fwd->send_size + dmtu))
9653                                                 mtu -= (fwd->send_size + dmtu);
9654                                         else
9655                                                 mtu = 0;
9656                                         data_list[bundle_at++] = fwd;
9657                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9658                                                 break;
9659                                         }
9660                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9661                                 } else {
9662                                         /* can't fit so we are done */
9663                                         break;
9664                                 }
9665                         }
9666                 }
9667                 /* Is there something to send for this destination? */
9668                 if (m) {
9669                         /*
9670                          * No matter if we fail/or suceed we should start a
9671                          * timer. A failure is like a lost IP packet :-)
9672                          */
9673                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9674                                 /*
9675                                  * no timer running on this destination
9676                                  * restart it.
9677                                  */
9678                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9679                                 tmr_started = 1;
9680                         }
9681                         /* Now lets send it, if there is anything to send :> */
9682                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9683                             (struct sockaddr *)&net->ro._l_addr, m,
9684                             auth_offset, auth, auth_keyid,
9685                             no_fragmentflg, 0, NULL, 0,
9686                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9687                             net->port, so_locked, NULL, NULL))) {
9688                                 /* error, we could not output */
9689                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9690                                 return (error);
9691                         }
9692                         m = endofchain = NULL;
9693                         auth = NULL;
9694                         auth_offset = 0;
9695                         /* For HB's */
9696                         /*
9697                          * We don't want to mark the net->sent time here
9698                          * since this we use this for HB and retrans cannot
9699                          * measure RTT
9700                          */
9701                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9702
9703                         /* For auto-close */
9704                         cnt_thru++;
9705                         if (*now_filled == 0) {
9706                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9707                                 *now = asoc->time_last_sent;
9708                                 *now_filled = 1;
9709                         } else {
9710                                 asoc->time_last_sent = *now;
9711                         }
9712                         *cnt_out += bundle_at;
9713 #ifdef SCTP_AUDITING_ENABLED
9714                         sctp_audit_log(0xC4, bundle_at);
9715 #endif
9716                         if (bundle_at) {
9717                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9718                         }
9719                         for (i = 0; i < bundle_at; i++) {
9720                                 SCTP_STAT_INCR(sctps_sendretransdata);
9721                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9722                                 /*
9723                                  * When we have a revoked data, and we
9724                                  * retransmit it, then we clear the revoked
9725                                  * flag since this flag dictates if we
9726                                  * subtracted from the fs
9727                                  */
9728                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9729                                         /* Deflate the cwnd */
9730                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9731                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9732                                 }
9733                                 data_list[i]->snd_count++;
9734                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9735                                 /* record the time */
9736                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9737                                 if (data_list[i]->book_size_scale) {
9738                                         /*
9739                                          * need to double the book size on
9740                                          * this one
9741                                          */
9742                                         data_list[i]->book_size_scale = 0;
9743                                         /*
9744                                          * Since we double the booksize, we
9745                                          * must also double the output queue
9746                                          * size, since this get shrunk when
9747                                          * we free by this amount.
9748                                          */
9749                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9750                                         data_list[i]->book_size *= 2;
9751
9752
9753                                 } else {
9754                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9755                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9756                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9757                                         }
9758                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9759                                             (uint32_t) (data_list[i]->send_size +
9760                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9761                                 }
9762                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9763                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9764                                             data_list[i]->whoTo->flight_size,
9765                                             data_list[i]->book_size,
9766                                             (uintptr_t) data_list[i]->whoTo,
9767                                             data_list[i]->rec.data.TSN_seq);
9768                                 }
9769                                 sctp_flight_size_increase(data_list[i]);
9770                                 sctp_total_flight_increase(stcb, data_list[i]);
9771                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9772                                         /* SWS sender side engages */
9773                                         asoc->peers_rwnd = 0;
9774                                 }
9775                                 if ((i == 0) &&
9776                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9777                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9778                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9779                                             (tmr_started == 0)) {
9780                                                 /*-
9781                                                  * ok we just fast-retrans'd
9782                                                  * the lowest TSN, i.e the
9783                                                  * first on the list. In
9784                                                  * this case we want to give
9785                                                  * some more time to get a
9786                                                  * SACK back without a
9787                                                  * t3-expiring.
9788                                                  */
9789                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9790                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9791                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9792                                         }
9793                                 }
9794                         }
9795                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9796                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9797                         }
9798 #ifdef SCTP_AUDITING_ENABLED
9799                         sctp_auditing(21, inp, stcb, NULL);
9800 #endif
9801                 } else {
9802                         /* None will fit */
9803                         return (1);
9804                 }
9805                 if (asoc->sent_queue_retran_cnt <= 0) {
9806                         /* all done we have no more to retran */
9807                         asoc->sent_queue_retran_cnt = 0;
9808                         break;
9809                 }
9810                 if (one_chunk) {
9811                         /* No more room in rwnd */
9812                         return (1);
9813                 }
9814                 /* stop the for loop here. we sent out a packet */
9815                 break;
9816         }
9817         return (0);
9818 }
9819
9820
9821 static int
9822 sctp_timer_validation(struct sctp_inpcb *inp,
9823     struct sctp_tcb *stcb,
9824     struct sctp_association *asoc,
9825     int ret)
9826 {
9827         struct sctp_nets *net;
9828
9829         /* Validate that a timer is running somewhere */
9830         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9831                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9832                         /* Here is a timer */
9833                         return (ret);
9834                 }
9835         }
9836         SCTP_TCB_LOCK_ASSERT(stcb);
9837         /* Gak, we did not have a timer somewhere */
9838         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9839         if (asoc->alternate) {
9840                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9841         } else {
9842                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9843         }
9844         return (ret);
9845 }
9846
9847 void
9848 sctp_chunk_output(struct sctp_inpcb *inp,
9849     struct sctp_tcb *stcb,
9850     int from_where,
9851     int so_locked
9852 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9853     SCTP_UNUSED
9854 #endif
9855 )
9856 {
9857         /*-
9858          * Ok this is the generic chunk service queue. we must do the
9859          * following:
9860          * - See if there are retransmits pending, if so we must
9861          *   do these first.
9862          * - Service the stream queue that is next, moving any
9863          *   message (note I must get a complete message i.e.
9864          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9865          *   TSN's
9866          * - Check to see if the cwnd/rwnd allows any output, if so we
9867          *   go ahead and fomulate and send the low level chunks. Making sure
9868          *   to combine any control in the control chunk queue also.
9869          */
9870         struct sctp_association *asoc;
9871         struct sctp_nets *net;
9872         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9873         unsigned int burst_cnt = 0;
9874         struct timeval now;
9875         int now_filled = 0;
9876         int nagle_on;
9877         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9878         int un_sent = 0;
9879         int fr_done;
9880         unsigned int tot_frs = 0;
9881
9882         asoc = &stcb->asoc;
9883         /* The Nagle algorithm is only applied when handling a send call. */
9884         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9885                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9886                         nagle_on = 0;
9887                 } else {
9888                         nagle_on = 1;
9889                 }
9890         } else {
9891                 nagle_on = 0;
9892         }
9893         SCTP_TCB_LOCK_ASSERT(stcb);
9894
9895         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9896
9897         if ((un_sent <= 0) &&
9898             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9899             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9900             (asoc->sent_queue_retran_cnt == 0)) {
9901                 /* Nothing to do unless there is something to be sent left */
9902                 return;
9903         }
9904         /*
9905          * Do we have something to send, data or control AND a sack timer
9906          * running, if so piggy-back the sack.
9907          */
9908         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9909                 sctp_send_sack(stcb, so_locked);
9910                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9911         }
9912         while (asoc->sent_queue_retran_cnt) {
9913                 /*-
9914                  * Ok, it is retransmission time only, we send out only ONE
9915                  * packet with a single call off to the retran code.
9916                  */
9917                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9918                         /*-
9919                          * Special hook for handling cookiess discarded
9920                          * by peer that carried data. Send cookie-ack only
9921                          * and then the next call with get the retran's.
9922                          */
9923                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9924                             from_where,
9925                             &now, &now_filled, frag_point, so_locked);
9926                         return;
9927                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9928                         /* if its not from a HB then do it */
9929                         fr_done = 0;
9930                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9931                         if (fr_done) {
9932                                 tot_frs++;
9933                         }
9934                 } else {
9935                         /*
9936                          * its from any other place, we don't allow retran
9937                          * output (only control)
9938                          */
9939                         ret = 1;
9940                 }
9941                 if (ret > 0) {
9942                         /* Can't send anymore */
9943                         /*-
9944                          * now lets push out control by calling med-level
9945                          * output once. this assures that we WILL send HB's
9946                          * if queued too.
9947                          */
9948                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9949                             from_where,
9950                             &now, &now_filled, frag_point, so_locked);
9951 #ifdef SCTP_AUDITING_ENABLED
9952                         sctp_auditing(8, inp, stcb, NULL);
9953 #endif
9954                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9955                         return;
9956                 }
9957                 if (ret < 0) {
9958                         /*-
9959                          * The count was off.. retran is not happening so do
9960                          * the normal retransmission.
9961                          */
9962 #ifdef SCTP_AUDITING_ENABLED
9963                         sctp_auditing(9, inp, stcb, NULL);
9964 #endif
9965                         if (ret == SCTP_RETRAN_EXIT) {
9966                                 return;
9967                         }
9968                         break;
9969                 }
9970                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9971                         /* Only one transmission allowed out of a timeout */
9972 #ifdef SCTP_AUDITING_ENABLED
9973                         sctp_auditing(10, inp, stcb, NULL);
9974 #endif
9975                         /* Push out any control */
9976                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9977                             &now, &now_filled, frag_point, so_locked);
9978                         return;
9979                 }
9980                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9981                         /* Hit FR burst limit */
9982                         return;
9983                 }
9984                 if ((num_out == 0) && (ret == 0)) {
9985                         /* No more retrans to send */
9986                         break;
9987                 }
9988         }
9989 #ifdef SCTP_AUDITING_ENABLED
9990         sctp_auditing(12, inp, stcb, NULL);
9991 #endif
9992         /* Check for bad destinations, if they exist move chunks around. */
9993         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9994                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9995                         /*-
9996                          * if possible move things off of this address we
9997                          * still may send below due to the dormant state but
9998                          * we try to find an alternate address to send to
9999                          * and if we have one we move all queued data on the
10000                          * out wheel to this alternate address.
10001                          */
10002                         if (net->ref_count > 1)
10003                                 sctp_move_chunks_from_net(stcb, net);
10004                 } else {
10005                         /*-
10006                          * if ((asoc->sat_network) || (net->addr_is_local))
10007                          * { burst_limit = asoc->max_burst *
10008                          * SCTP_SAT_NETWORK_BURST_INCR; }
10009                          */
10010                         if (asoc->max_burst > 0) {
10011                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10012                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10013                                                 /*
10014                                                  * JRS - Use the congestion
10015                                                  * control given in the
10016                                                  * congestion control module
10017                                                  */
10018                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10019                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10020                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10021                                                 }
10022                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10023                                         }
10024                                         net->fast_retran_ip = 0;
10025                                 } else {
10026                                         if (net->flight_size == 0) {
10027                                                 /*
10028                                                  * Should be decaying the
10029                                                  * cwnd here
10030                                                  */
10031                                                 ;
10032                                         }
10033                                 }
10034                         }
10035                 }
10036
10037         }
10038         burst_cnt = 0;
10039         do {
10040                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10041                     &reason_code, 0, from_where,
10042                     &now, &now_filled, frag_point, so_locked);
10043                 if (error) {
10044                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10045                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10046                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10047                         }
10048                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10049                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10050                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10051                         }
10052                         break;
10053                 }
10054                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10055
10056                 tot_out += num_out;
10057                 burst_cnt++;
10058                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10059                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10060                         if (num_out == 0) {
10061                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10062                         }
10063                 }
10064                 if (nagle_on) {
10065                         /*
10066                          * When the Nagle algorithm is used, look at how
10067                          * much is unsent, then if its smaller than an MTU
10068                          * and we have data in flight we stop, except if we
10069                          * are handling a fragmented user message.
10070                          */
10071                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10072                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10073                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10074                             (stcb->asoc.total_flight > 0) &&
10075                             ((stcb->asoc.locked_on_sending == NULL) ||
10076                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10077                                 break;
10078                         }
10079                 }
10080                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10081                     TAILQ_EMPTY(&asoc->send_queue) &&
10082                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10083                         /* Nothing left to send */
10084                         break;
10085                 }
10086                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10087                         /* Nothing left to send */
10088                         break;
10089                 }
10090         } while (num_out &&
10091             ((asoc->max_burst == 0) ||
10092             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10093             (burst_cnt < asoc->max_burst)));
10094
10095         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10096                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10097                         SCTP_STAT_INCR(sctps_maxburstqueued);
10098                         asoc->burst_limit_applied = 1;
10099                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10100                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10101                         }
10102                 } else {
10103                         asoc->burst_limit_applied = 0;
10104                 }
10105         }
10106         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10107                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10108         }
10109         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10110             tot_out);
10111
10112         /*-
10113          * Now we need to clean up the control chunk chain if a ECNE is on
10114          * it. It must be marked as UNSENT again so next call will continue
10115          * to send it until such time that we get a CWR, to remove it.
10116          */
10117         if (stcb->asoc.ecn_echo_cnt_onq)
10118                 sctp_fix_ecn_echo(asoc);
10119         return;
10120 }
10121
10122
10123 int
10124 sctp_output(inp, m, addr, control, p, flags)
10125         struct sctp_inpcb *inp;
10126         struct mbuf *m;
10127         struct sockaddr *addr;
10128         struct mbuf *control;
10129         struct thread *p;
10130         int flags;
10131 {
10132         if (inp == NULL) {
10133                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10134                 return (EINVAL);
10135         }
10136         if (inp->sctp_socket == NULL) {
10137                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10138                 return (EINVAL);
10139         }
10140         return (sctp_sosend(inp->sctp_socket,
10141             addr,
10142             (struct uio *)NULL,
10143             m,
10144             control,
10145             flags, p
10146             ));
10147 }
10148
10149 void
10150 send_forward_tsn(struct sctp_tcb *stcb,
10151     struct sctp_association *asoc)
10152 {
10153         struct sctp_tmit_chunk *chk;
10154         struct sctp_forward_tsn_chunk *fwdtsn;
10155         uint32_t advance_peer_ack_point;
10156
10157         SCTP_TCB_LOCK_ASSERT(stcb);
10158         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10159                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10160                         /* mark it to unsent */
10161                         chk->sent = SCTP_DATAGRAM_UNSENT;
10162                         chk->snd_count = 0;
10163                         /* Do we correct its output location? */
10164                         if (chk->whoTo) {
10165                                 sctp_free_remote_addr(chk->whoTo);
10166                                 chk->whoTo = NULL;
10167                         }
10168                         goto sctp_fill_in_rest;
10169                 }
10170         }
10171         /* Ok if we reach here we must build one */
10172         sctp_alloc_a_chunk(stcb, chk);
10173         if (chk == NULL) {
10174                 return;
10175         }
10176         asoc->fwd_tsn_cnt++;
10177         chk->copy_by_ref = 0;
10178         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10179         chk->rec.chunk_id.can_take_data = 0;
10180         chk->asoc = asoc;
10181         chk->whoTo = NULL;
10182         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10183         if (chk->data == NULL) {
10184                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10185                 return;
10186         }
10187         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10188         chk->sent = SCTP_DATAGRAM_UNSENT;
10189         chk->snd_count = 0;
10190         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10191         asoc->ctrl_queue_cnt++;
10192 sctp_fill_in_rest:
10193         /*-
10194          * Here we go through and fill out the part that deals with
10195          * stream/seq of the ones we skip.
10196          */
10197         SCTP_BUF_LEN(chk->data) = 0;
10198         {
10199                 struct sctp_tmit_chunk *at, *tp1, *last;
10200                 struct sctp_strseq *strseq;
10201                 unsigned int cnt_of_space, i, ovh;
10202                 unsigned int space_needed;
10203                 unsigned int cnt_of_skipped = 0;
10204
10205                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10206                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10207                                 /* no more to look at */
10208                                 break;
10209                         }
10210                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10211                                 /* We don't report these */
10212                                 continue;
10213                         }
10214                         cnt_of_skipped++;
10215                 }
10216                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10217                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10218
10219                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10220
10221                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10222                         ovh = SCTP_MIN_OVERHEAD;
10223                 } else {
10224                         ovh = SCTP_MIN_V4_OVERHEAD;
10225                 }
10226                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10227                         /* trim to a mtu size */
10228                         cnt_of_space = asoc->smallest_mtu - ovh;
10229                 }
10230                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10231                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10232                             0xff, 0, cnt_of_skipped,
10233                             asoc->advanced_peer_ack_point);
10234
10235                 }
10236                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10237                 if (cnt_of_space < space_needed) {
10238                         /*-
10239                          * ok we must trim down the chunk by lowering the
10240                          * advance peer ack point.
10241                          */
10242                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10243                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10244                                     0xff, 0xff, cnt_of_space,
10245                                     space_needed);
10246                         }
10247                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10248                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10249                         /*-
10250                          * Go through and find the TSN that will be the one
10251                          * we report.
10252                          */
10253                         at = TAILQ_FIRST(&asoc->sent_queue);
10254                         for (i = 0; i < cnt_of_skipped; i++) {
10255                                 tp1 = TAILQ_NEXT(at, sctp_next);
10256                                 if (tp1 == NULL) {
10257                                         break;
10258                                 }
10259                                 at = tp1;
10260                         }
10261                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10262                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10263                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10264                                     asoc->advanced_peer_ack_point);
10265                         }
10266                         last = at;
10267                         /*-
10268                          * last now points to last one I can report, update
10269                          * peer ack point
10270                          */
10271                         if (last)
10272                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10273                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10274                             cnt_of_skipped * sizeof(struct sctp_strseq);
10275                 }
10276                 chk->send_size = space_needed;
10277                 /* Setup the chunk */
10278                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10279                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10280                 fwdtsn->ch.chunk_flags = 0;
10281                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10282                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10283                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10284                 fwdtsn++;
10285                 /*-
10286                  * Move pointer to after the fwdtsn and transfer to the
10287                  * strseq pointer.
10288                  */
10289                 strseq = (struct sctp_strseq *)fwdtsn;
10290                 /*-
10291                  * Now populate the strseq list. This is done blindly
10292                  * without pulling out duplicate stream info. This is
10293                  * inefficent but won't harm the process since the peer will
10294                  * look at these in sequence and will thus release anything.
10295                  * It could mean we exceed the PMTU and chop off some that
10296                  * we could have included.. but this is unlikely (aka 1432/4
10297                  * would mean 300+ stream seq's would have to be reported in
10298                  * one FWD-TSN. With a bit of work we can later FIX this to
10299                  * optimize and pull out duplcates.. but it does add more
10300                  * overhead. So for now... not!
10301                  */
10302                 at = TAILQ_FIRST(&asoc->sent_queue);
10303                 for (i = 0; i < cnt_of_skipped; i++) {
10304                         tp1 = TAILQ_NEXT(at, sctp_next);
10305                         if (tp1 == NULL)
10306                                 break;
10307                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10308                                 /* We don't report these */
10309                                 i--;
10310                                 at = tp1;
10311                                 continue;
10312                         }
10313                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10314                                 at->rec.data.fwd_tsn_cnt = 0;
10315                         }
10316                         strseq->stream = ntohs(at->rec.data.stream_number);
10317                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10318                         strseq++;
10319                         at = tp1;
10320                 }
10321         }
10322         return;
10323
10324 }
10325
10326 void
10327 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10328 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10329     SCTP_UNUSED
10330 #endif
10331 )
10332 {
10333         /*-
10334          * Queue up a SACK or NR-SACK in the control queue.
10335          * We must first check to see if a SACK or NR-SACK is
10336          * somehow on the control queue.
10337          * If so, we will take and and remove the old one.
10338          */
10339         struct sctp_association *asoc;
10340         struct sctp_tmit_chunk *chk, *a_chk;
10341         struct sctp_sack_chunk *sack;
10342         struct sctp_nr_sack_chunk *nr_sack;
10343         struct sctp_gap_ack_block *gap_descriptor;
10344         struct sack_track *selector;
10345         int mergeable = 0;
10346         int offset;
10347         caddr_t limit;
10348         uint32_t *dup;
10349         int limit_reached = 0;
10350         unsigned int i, siz, j;
10351         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10352         int num_dups = 0;
10353         int space_req;
10354         uint32_t highest_tsn;
10355         uint8_t flags;
10356         uint8_t type;
10357         uint8_t tsn_map;
10358
10359         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10360             (stcb->asoc.peer_supports_nr_sack == 1)) {
10361                 type = SCTP_NR_SELECTIVE_ACK;
10362         } else {
10363                 type = SCTP_SELECTIVE_ACK;
10364         }
10365         a_chk = NULL;
10366         asoc = &stcb->asoc;
10367         SCTP_TCB_LOCK_ASSERT(stcb);
10368         if (asoc->last_data_chunk_from == NULL) {
10369                 /* Hmm we never received anything */
10370                 return;
10371         }
10372         sctp_slide_mapping_arrays(stcb);
10373         sctp_set_rwnd(stcb, asoc);
10374         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10375                 if (chk->rec.chunk_id.id == type) {
10376                         /* Hmm, found a sack already on queue, remove it */
10377                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10378                         asoc->ctrl_queue_cnt--;
10379                         a_chk = chk;
10380                         if (a_chk->data) {
10381                                 sctp_m_freem(a_chk->data);
10382                                 a_chk->data = NULL;
10383                         }
10384                         if (a_chk->whoTo) {
10385                                 sctp_free_remote_addr(a_chk->whoTo);
10386                                 a_chk->whoTo = NULL;
10387                         }
10388                         break;
10389                 }
10390         }
10391         if (a_chk == NULL) {
10392                 sctp_alloc_a_chunk(stcb, a_chk);
10393                 if (a_chk == NULL) {
10394                         /* No memory so we drop the idea, and set a timer */
10395                         if (stcb->asoc.delayed_ack) {
10396                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10397                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10398                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10399                                     stcb->sctp_ep, stcb, NULL);
10400                         } else {
10401                                 stcb->asoc.send_sack = 1;
10402                         }
10403                         return;
10404                 }
10405                 a_chk->copy_by_ref = 0;
10406                 a_chk->rec.chunk_id.id = type;
10407                 a_chk->rec.chunk_id.can_take_data = 1;
10408         }
10409         /* Clear our pkt counts */
10410         asoc->data_pkts_seen = 0;
10411
10412         a_chk->asoc = asoc;
10413         a_chk->snd_count = 0;
10414         a_chk->send_size = 0;   /* fill in later */
10415         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10416         a_chk->whoTo = NULL;
10417
10418         if ((asoc->numduptsns) ||
10419             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10420                 /*-
10421                  * Ok, we have some duplicates or the destination for the
10422                  * sack is unreachable, lets see if we can select an
10423                  * alternate than asoc->last_data_chunk_from
10424                  */
10425                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10426                     (asoc->used_alt_onsack > asoc->numnets)) {
10427                         /* We used an alt last time, don't this time */
10428                         a_chk->whoTo = NULL;
10429                 } else {
10430                         asoc->used_alt_onsack++;
10431                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10432                 }
10433                 if (a_chk->whoTo == NULL) {
10434                         /* Nope, no alternate */
10435                         a_chk->whoTo = asoc->last_data_chunk_from;
10436                         asoc->used_alt_onsack = 0;
10437                 }
10438         } else {
10439                 /*
10440                  * No duplicates so we use the last place we received data
10441                  * from.
10442                  */
10443                 asoc->used_alt_onsack = 0;
10444                 a_chk->whoTo = asoc->last_data_chunk_from;
10445         }
10446         if (a_chk->whoTo) {
10447                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10448         }
10449         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10450                 highest_tsn = asoc->highest_tsn_inside_map;
10451         } else {
10452                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10453         }
10454         if (highest_tsn == asoc->cumulative_tsn) {
10455                 /* no gaps */
10456                 if (type == SCTP_SELECTIVE_ACK) {
10457                         space_req = sizeof(struct sctp_sack_chunk);
10458                 } else {
10459                         space_req = sizeof(struct sctp_nr_sack_chunk);
10460                 }
10461         } else {
10462                 /* gaps get a cluster */
10463                 space_req = MCLBYTES;
10464         }
10465         /* Ok now lets formulate a MBUF with our sack */
10466         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10467         if ((a_chk->data == NULL) ||
10468             (a_chk->whoTo == NULL)) {
10469                 /* rats, no mbuf memory */
10470                 if (a_chk->data) {
10471                         /* was a problem with the destination */
10472                         sctp_m_freem(a_chk->data);
10473                         a_chk->data = NULL;
10474                 }
10475                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10476                 /* sa_ignore NO_NULL_CHK */
10477                 if (stcb->asoc.delayed_ack) {
10478                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10479                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10480                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10481                             stcb->sctp_ep, stcb, NULL);
10482                 } else {
10483                         stcb->asoc.send_sack = 1;
10484                 }
10485                 return;
10486         }
10487         /* ok, lets go through and fill it in */
10488         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10489         space = M_TRAILINGSPACE(a_chk->data);
10490         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10491                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10492         }
10493         limit = mtod(a_chk->data, caddr_t);
10494         limit += space;
10495
10496         flags = 0;
10497
10498         if ((asoc->sctp_cmt_on_off > 0) &&
10499             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10500                 /*-
10501                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10502                  * received, then set high bit to 1, else 0. Reset
10503                  * pkts_rcvd.
10504                  */
10505                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10506                 asoc->cmt_dac_pkts_rcvd = 0;
10507         }
10508 #ifdef SCTP_ASOCLOG_OF_TSNS
10509         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10510         stcb->asoc.cumack_log_atsnt++;
10511         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10512                 stcb->asoc.cumack_log_atsnt = 0;
10513         }
10514 #endif
10515         /* reset the readers interpretation */
10516         stcb->freed_by_sorcv_sincelast = 0;
10517
10518         if (type == SCTP_SELECTIVE_ACK) {
10519                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10520                 nr_sack = NULL;
10521                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10522                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10523                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10524                 } else {
10525                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10526                 }
10527         } else {
10528                 sack = NULL;
10529                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10530                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10531                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10532                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10533                 } else {
10534                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10535                 }
10536         }
10537
10538         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10539                 offset = 1;
10540         } else {
10541                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10542         }
10543         if (((type == SCTP_SELECTIVE_ACK) &&
10544             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10545             ((type == SCTP_NR_SELECTIVE_ACK) &&
10546             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10547                 /* we have a gap .. maybe */
10548                 for (i = 0; i < siz; i++) {
10549                         tsn_map = asoc->mapping_array[i];
10550                         if (type == SCTP_SELECTIVE_ACK) {
10551                                 tsn_map |= asoc->nr_mapping_array[i];
10552                         }
10553                         if (i == 0) {
10554                                 /*
10555                                  * Clear all bits corresponding to TSNs
10556                                  * smaller or equal to the cumulative TSN.
10557                                  */
10558                                 tsn_map &= (~0 << (1 - offset));
10559                         }
10560                         selector = &sack_array[tsn_map];
10561                         if (mergeable && selector->right_edge) {
10562                                 /*
10563                                  * Backup, left and right edges were ok to
10564                                  * merge.
10565                                  */
10566                                 num_gap_blocks--;
10567                                 gap_descriptor--;
10568                         }
10569                         if (selector->num_entries == 0)
10570                                 mergeable = 0;
10571                         else {
10572                                 for (j = 0; j < selector->num_entries; j++) {
10573                                         if (mergeable && selector->right_edge) {
10574                                                 /*
10575                                                  * do a merge by NOT setting
10576                                                  * the left side
10577                                                  */
10578                                                 mergeable = 0;
10579                                         } else {
10580                                                 /*
10581                                                  * no merge, set the left
10582                                                  * side
10583                                                  */
10584                                                 mergeable = 0;
10585                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10586                                         }
10587                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10588                                         num_gap_blocks++;
10589                                         gap_descriptor++;
10590                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10591                                                 /* no more room */
10592                                                 limit_reached = 1;
10593                                                 break;
10594                                         }
10595                                 }
10596                                 if (selector->left_edge) {
10597                                         mergeable = 1;
10598                                 }
10599                         }
10600                         if (limit_reached) {
10601                                 /* Reached the limit stop */
10602                                 break;
10603                         }
10604                         offset += 8;
10605                 }
10606         }
10607         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10608             (limit_reached == 0)) {
10609
10610                 mergeable = 0;
10611
10612                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10613                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10614                 } else {
10615                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10616                 }
10617
10618                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10619                         offset = 1;
10620                 } else {
10621                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10622                 }
10623                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10624                         /* we have a gap .. maybe */
10625                         for (i = 0; i < siz; i++) {
10626                                 tsn_map = asoc->nr_mapping_array[i];
10627                                 if (i == 0) {
10628                                         /*
10629                                          * Clear all bits corresponding to
10630                                          * TSNs smaller or equal to the
10631                                          * cumulative TSN.
10632                                          */
10633                                         tsn_map &= (~0 << (1 - offset));
10634                                 }
10635                                 selector = &sack_array[tsn_map];
10636                                 if (mergeable && selector->right_edge) {
10637                                         /*
10638                                          * Backup, left and right edges were
10639                                          * ok to merge.
10640                                          */
10641                                         num_nr_gap_blocks--;
10642                                         gap_descriptor--;
10643                                 }
10644                                 if (selector->num_entries == 0)
10645                                         mergeable = 0;
10646                                 else {
10647                                         for (j = 0; j < selector->num_entries; j++) {
10648                                                 if (mergeable && selector->right_edge) {
10649                                                         /*
10650                                                          * do a merge by NOT
10651                                                          * setting the left
10652                                                          * side
10653                                                          */
10654                                                         mergeable = 0;
10655                                                 } else {
10656                                                         /*
10657                                                          * no merge, set the
10658                                                          * left side
10659                                                          */
10660                                                         mergeable = 0;
10661                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10662                                                 }
10663                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10664                                                 num_nr_gap_blocks++;
10665                                                 gap_descriptor++;
10666                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10667                                                         /* no more room */
10668                                                         limit_reached = 1;
10669                                                         break;
10670                                                 }
10671                                         }
10672                                         if (selector->left_edge) {
10673                                                 mergeable = 1;
10674                                         }
10675                                 }
10676                                 if (limit_reached) {
10677                                         /* Reached the limit stop */
10678                                         break;
10679                                 }
10680                                 offset += 8;
10681                         }
10682                 }
10683         }
10684         /* now we must add any dups we are going to report. */
10685         if ((limit_reached == 0) && (asoc->numduptsns)) {
10686                 dup = (uint32_t *) gap_descriptor;
10687                 for (i = 0; i < asoc->numduptsns; i++) {
10688                         *dup = htonl(asoc->dup_tsns[i]);
10689                         dup++;
10690                         num_dups++;
10691                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10692                                 /* no more room */
10693                                 break;
10694                         }
10695                 }
10696                 asoc->numduptsns = 0;
10697         }
10698         /*
10699          * now that the chunk is prepared queue it to the control chunk
10700          * queue.
10701          */
10702         if (type == SCTP_SELECTIVE_ACK) {
10703                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10704                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10705                     num_dups * sizeof(int32_t);
10706                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10707                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10708                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10709                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10710                 sack->sack.num_dup_tsns = htons(num_dups);
10711                 sack->ch.chunk_type = type;
10712                 sack->ch.chunk_flags = flags;
10713                 sack->ch.chunk_length = htons(a_chk->send_size);
10714         } else {
10715                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10716                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10717                     num_dups * sizeof(int32_t);
10718                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10719                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10720                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10721                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10722                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10723                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10724                 nr_sack->nr_sack.reserved = 0;
10725                 nr_sack->ch.chunk_type = type;
10726                 nr_sack->ch.chunk_flags = flags;
10727                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10728         }
10729         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10730         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10731         asoc->ctrl_queue_cnt++;
10732         asoc->send_sack = 0;
10733         SCTP_STAT_INCR(sctps_sendsacks);
10734         return;
10735 }
10736
10737 void
10738 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10739 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10740     SCTP_UNUSED
10741 #endif
10742 )
10743 {
10744         struct mbuf *m_abort;
10745         struct mbuf *m_out = NULL, *m_end = NULL;
10746         struct sctp_abort_chunk *abort = NULL;
10747         int sz;
10748         uint32_t auth_offset = 0;
10749         struct sctp_auth_chunk *auth = NULL;
10750         struct sctp_nets *net;
10751
10752         /*-
10753          * Add an AUTH chunk, if chunk requires it and save the offset into
10754          * the chain for AUTH
10755          */
10756         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10757             stcb->asoc.peer_auth_chunks)) {
10758                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10759                     stcb, SCTP_ABORT_ASSOCIATION);
10760                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10761         }
10762         SCTP_TCB_LOCK_ASSERT(stcb);
10763         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10764         if (m_abort == NULL) {
10765                 /* no mbuf's */
10766                 if (m_out)
10767                         sctp_m_freem(m_out);
10768                 return;
10769         }
10770         /* link in any error */
10771         SCTP_BUF_NEXT(m_abort) = operr;
10772         sz = 0;
10773         if (operr) {
10774                 struct mbuf *n;
10775
10776                 n = operr;
10777                 while (n) {
10778                         sz += SCTP_BUF_LEN(n);
10779                         n = SCTP_BUF_NEXT(n);
10780                 }
10781         }
10782         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10783         if (m_out == NULL) {
10784                 /* NO Auth chunk prepended, so reserve space in front */
10785                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10786                 m_out = m_abort;
10787         } else {
10788                 /* Put AUTH chunk at the front of the chain */
10789                 SCTP_BUF_NEXT(m_end) = m_abort;
10790         }
10791         if (stcb->asoc.alternate) {
10792                 net = stcb->asoc.alternate;
10793         } else {
10794                 net = stcb->asoc.primary_destination;
10795         }
10796         /* fill in the ABORT chunk */
10797         abort = mtod(m_abort, struct sctp_abort_chunk *);
10798         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10799         abort->ch.chunk_flags = 0;
10800         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10801
10802         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10803             (struct sockaddr *)&net->ro._l_addr,
10804             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10805             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10806             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10807         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10808 }
10809
10810 void
10811 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10812     struct sctp_nets *net,
10813     int reflect_vtag)
10814 {
10815         /* formulate and SEND a SHUTDOWN-COMPLETE */
10816         struct mbuf *m_shutdown_comp;
10817         struct sctp_shutdown_complete_chunk *shutdown_complete;
10818         uint32_t vtag;
10819         uint8_t flags;
10820
10821         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10822         if (m_shutdown_comp == NULL) {
10823                 /* no mbuf's */
10824                 return;
10825         }
10826         if (reflect_vtag) {
10827                 flags = SCTP_HAD_NO_TCB;
10828                 vtag = stcb->asoc.my_vtag;
10829         } else {
10830                 flags = 0;
10831                 vtag = stcb->asoc.peer_vtag;
10832         }
10833         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10834         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10835         shutdown_complete->ch.chunk_flags = flags;
10836         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10837         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10838         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10839             (struct sockaddr *)&net->ro._l_addr,
10840             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10841             stcb->sctp_ep->sctp_lport, stcb->rport,
10842             htonl(vtag),
10843             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10844         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10845         return;
10846 }
10847
10848 void
10849 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10850     uint32_t vrf_id, uint16_t port)
10851 {
10852         /* formulate and SEND a SHUTDOWN-COMPLETE */
10853         struct mbuf *o_pak;
10854         struct mbuf *mout;
10855         struct ip *iph;
10856         struct udphdr *udp = NULL;
10857         int offset_out, len, mlen;
10858         struct sctp_shutdown_complete_msg *comp_cp;
10859
10860 #ifdef INET
10861         struct ip *iph_out;
10862
10863 #endif
10864 #ifdef INET6
10865         struct ip6_hdr *ip6, *ip6_out;
10866
10867 #endif
10868
10869         iph = mtod(m, struct ip *);
10870         switch (iph->ip_v) {
10871 #ifdef INET
10872         case IPVERSION:
10873                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10874                 break;
10875 #endif
10876 #ifdef INET6
10877         case IPV6_VERSION >> 4:
10878                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10879                 break;
10880 #endif
10881         default:
10882                 return;
10883         }
10884         if (port) {
10885                 len += sizeof(struct udphdr);
10886         }
10887         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10888         if (mout == NULL) {
10889                 return;
10890         }
10891         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10892         SCTP_BUF_LEN(mout) = len;
10893         SCTP_BUF_NEXT(mout) = NULL;
10894         if (m->m_flags & M_FLOWID) {
10895                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10896                 mout->m_flags |= M_FLOWID;
10897         }
10898 #ifdef INET
10899         iph_out = NULL;
10900 #endif
10901 #ifdef INET6
10902         ip6_out = NULL;
10903 #endif
10904         offset_out = 0;
10905
10906         switch (iph->ip_v) {
10907 #ifdef INET
10908         case IPVERSION:
10909                 iph_out = mtod(mout, struct ip *);
10910
10911                 /* Fill in the IP header for the ABORT */
10912                 iph_out->ip_v = IPVERSION;
10913                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10914                 iph_out->ip_tos = (u_char)0;
10915                 iph_out->ip_id = 0;
10916                 iph_out->ip_off = 0;
10917                 iph_out->ip_ttl = MAXTTL;
10918                 if (port) {
10919                         iph_out->ip_p = IPPROTO_UDP;
10920                 } else {
10921                         iph_out->ip_p = IPPROTO_SCTP;
10922                 }
10923                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10924                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10925
10926                 /* let IP layer calculate this */
10927                 iph_out->ip_sum = 0;
10928                 offset_out += sizeof(*iph_out);
10929                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10930                     (caddr_t)iph_out + offset_out);
10931                 break;
10932 #endif
10933 #ifdef INET6
10934         case IPV6_VERSION >> 4:
10935                 ip6 = (struct ip6_hdr *)iph;
10936                 ip6_out = mtod(mout, struct ip6_hdr *);
10937
10938                 /* Fill in the IPv6 header for the ABORT */
10939                 ip6_out->ip6_flow = ip6->ip6_flow;
10940                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10941                 if (port) {
10942                         ip6_out->ip6_nxt = IPPROTO_UDP;
10943                 } else {
10944                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10945                 }
10946                 ip6_out->ip6_src = ip6->ip6_dst;
10947                 ip6_out->ip6_dst = ip6->ip6_src;
10948                 /*
10949                  * ?? The old code had both the iph len + payload, I think
10950                  * this is wrong and would never have worked
10951                  */
10952                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10953                 offset_out += sizeof(*ip6_out);
10954                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10955                     (caddr_t)ip6_out + offset_out);
10956                 break;
10957 #endif                          /* INET6 */
10958         default:
10959                 /* Currently not supported. */
10960                 sctp_m_freem(mout);
10961                 return;
10962         }
10963         if (port) {
10964                 udp = (struct udphdr *)comp_cp;
10965                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10966                 udp->uh_dport = port;
10967                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10968 #ifdef INET
10969                 if (iph_out)
10970                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10971 #endif
10972                 offset_out += sizeof(struct udphdr);
10973                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10974         }
10975         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10976                 /* no mbuf's */
10977                 sctp_m_freem(mout);
10978                 return;
10979         }
10980         /* Now copy in and fill in the ABORT tags etc. */
10981         comp_cp->sh.src_port = sh->dest_port;
10982         comp_cp->sh.dest_port = sh->src_port;
10983         comp_cp->sh.checksum = 0;
10984         comp_cp->sh.v_tag = sh->v_tag;
10985         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10986         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10987         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10988
10989 #ifdef INET
10990         if (iph_out != NULL) {
10991                 sctp_route_t ro;
10992                 int ret;
10993
10994                 mlen = SCTP_BUF_LEN(mout);
10995                 bzero(&ro, sizeof ro);
10996                 /* set IPv4 length */
10997                 iph_out->ip_len = mlen;
10998 #ifdef  SCTP_PACKET_LOGGING
10999                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11000                         sctp_packet_log(mout, mlen);
11001 #endif
11002                 if (port) {
11003 #if defined(SCTP_WITH_NO_CSUM)
11004                         SCTP_STAT_INCR(sctps_sendnocrc);
11005 #else
11006                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
11007                         SCTP_STAT_INCR(sctps_sendswcrc);
11008 #endif
11009                         SCTP_ENABLE_UDP_CSUM(mout);
11010                 } else {
11011 #if defined(SCTP_WITH_NO_CSUM)
11012                         SCTP_STAT_INCR(sctps_sendnocrc);
11013 #else
11014                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11015                         mout->m_pkthdr.csum_data = 0;
11016                         SCTP_STAT_INCR(sctps_sendhwcrc);
11017 #endif
11018                 }
11019                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11020                 /* out it goes */
11021                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11022
11023                 /* Free the route if we got one back */
11024                 if (ro.ro_rt)
11025                         RTFREE(ro.ro_rt);
11026         }
11027 #endif
11028 #ifdef INET6
11029         if (ip6_out != NULL) {
11030                 struct route_in6 ro;
11031                 int ret;
11032                 struct ifnet *ifp = NULL;
11033
11034                 bzero(&ro, sizeof(ro));
11035                 mlen = SCTP_BUF_LEN(mout);
11036 #ifdef  SCTP_PACKET_LOGGING
11037                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11038                         sctp_packet_log(mout, mlen);
11039 #endif
11040                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11041                 if (port) {
11042 #if defined(SCTP_WITH_NO_CSUM)
11043                         SCTP_STAT_INCR(sctps_sendnocrc);
11044 #else
11045                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11046                         SCTP_STAT_INCR(sctps_sendswcrc);
11047 #endif
11048                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
11049                                 udp->uh_sum = 0xffff;
11050                         }
11051                 } else {
11052 #if defined(SCTP_WITH_NO_CSUM)
11053                         SCTP_STAT_INCR(sctps_sendnocrc);
11054 #else
11055                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11056                         mout->m_pkthdr.csum_data = 0;
11057                         SCTP_STAT_INCR(sctps_sendhwcrc);
11058 #endif
11059                 }
11060                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11061
11062                 /* Free the route if we got one back */
11063                 if (ro.ro_rt)
11064                         RTFREE(ro.ro_rt);
11065         }
11066 #endif
11067         SCTP_STAT_INCR(sctps_sendpackets);
11068         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11069         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11070         return;
11071
11072 }
11073
11074 void
11075 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11076 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11077     SCTP_UNUSED
11078 #endif
11079 )
11080 {
11081         struct sctp_tmit_chunk *chk;
11082         struct sctp_heartbeat_chunk *hb;
11083         struct timeval now;
11084
11085         SCTP_TCB_LOCK_ASSERT(stcb);
11086         if (net == NULL) {
11087                 return;
11088         }
11089         (void)SCTP_GETTIME_TIMEVAL(&now);
11090         switch (net->ro._l_addr.sa.sa_family) {
11091 #ifdef INET
11092         case AF_INET:
11093                 break;
11094 #endif
11095 #ifdef INET6
11096         case AF_INET6:
11097                 break;
11098 #endif
11099         default:
11100                 return;
11101         }
11102         sctp_alloc_a_chunk(stcb, chk);
11103         if (chk == NULL) {
11104                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11105                 return;
11106         }
11107         chk->copy_by_ref = 0;
11108         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11109         chk->rec.chunk_id.can_take_data = 1;
11110         chk->asoc = &stcb->asoc;
11111         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11112
11113         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11114         if (chk->data == NULL) {
11115                 sctp_free_a_chunk(stcb, chk, so_locked);
11116                 return;
11117         }
11118         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11119         SCTP_BUF_LEN(chk->data) = chk->send_size;
11120         chk->sent = SCTP_DATAGRAM_UNSENT;
11121         chk->snd_count = 0;
11122         chk->whoTo = net;
11123         atomic_add_int(&chk->whoTo->ref_count, 1);
11124         /* Now we have a mbuf that we can fill in with the details */
11125         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11126         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11127         /* fill out chunk header */
11128         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11129         hb->ch.chunk_flags = 0;
11130         hb->ch.chunk_length = htons(chk->send_size);
11131         /* Fill out hb parameter */
11132         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11133         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11134         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11135         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11136         /* Did our user request this one, put it in */
11137         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11138         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11139         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11140                 /*
11141                  * we only take from the entropy pool if the address is not
11142                  * confirmed.
11143                  */
11144                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11145                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11146         } else {
11147                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11148                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11149         }
11150         switch (net->ro._l_addr.sa.sa_family) {
11151 #ifdef INET
11152         case AF_INET:
11153                 memcpy(hb->heartbeat.hb_info.address,
11154                     &net->ro._l_addr.sin.sin_addr,
11155                     sizeof(net->ro._l_addr.sin.sin_addr));
11156                 break;
11157 #endif
11158 #ifdef INET6
11159         case AF_INET6:
11160                 memcpy(hb->heartbeat.hb_info.address,
11161                     &net->ro._l_addr.sin6.sin6_addr,
11162                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11163                 break;
11164 #endif
11165         default:
11166                 return;
11167                 break;
11168         }
11169         net->hb_responded = 0;
11170         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11171         stcb->asoc.ctrl_queue_cnt++;
11172         SCTP_STAT_INCR(sctps_sendheartbeat);
11173         return;
11174 }
11175
11176 void
11177 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11178     uint32_t high_tsn)
11179 {
11180         struct sctp_association *asoc;
11181         struct sctp_ecne_chunk *ecne;
11182         struct sctp_tmit_chunk *chk;
11183
11184         if (net == NULL) {
11185                 return;
11186         }
11187         asoc = &stcb->asoc;
11188         SCTP_TCB_LOCK_ASSERT(stcb);
11189         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11190                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11191                         /* found a previous ECN_ECHO update it if needed */
11192                         uint32_t cnt, ctsn;
11193
11194                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11195                         ctsn = ntohl(ecne->tsn);
11196                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11197                                 ecne->tsn = htonl(high_tsn);
11198                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11199                         }
11200                         cnt = ntohl(ecne->num_pkts_since_cwr);
11201                         cnt++;
11202                         ecne->num_pkts_since_cwr = htonl(cnt);
11203                         return;
11204                 }
11205         }
11206         /* nope could not find one to update so we must build one */
11207         sctp_alloc_a_chunk(stcb, chk);
11208         if (chk == NULL) {
11209                 return;
11210         }
11211         chk->copy_by_ref = 0;
11212         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11213         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11214         chk->rec.chunk_id.can_take_data = 0;
11215         chk->asoc = &stcb->asoc;
11216         chk->send_size = sizeof(struct sctp_ecne_chunk);
11217         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11218         if (chk->data == NULL) {
11219                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11220                 return;
11221         }
11222         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11223         SCTP_BUF_LEN(chk->data) = chk->send_size;
11224         chk->sent = SCTP_DATAGRAM_UNSENT;
11225         chk->snd_count = 0;
11226         chk->whoTo = net;
11227         atomic_add_int(&chk->whoTo->ref_count, 1);
11228
11229         stcb->asoc.ecn_echo_cnt_onq++;
11230         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11231         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11232         ecne->ch.chunk_flags = 0;
11233         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11234         ecne->tsn = htonl(high_tsn);
11235         ecne->num_pkts_since_cwr = htonl(1);
11236         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11237         asoc->ctrl_queue_cnt++;
11238 }
11239
11240 void
11241 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11242     struct mbuf *m, int iphlen, int bad_crc)
11243 {
11244         struct sctp_association *asoc;
11245         struct sctp_pktdrop_chunk *drp;
11246         struct sctp_tmit_chunk *chk;
11247         uint8_t *datap;
11248         int len;
11249         int was_trunc = 0;
11250         struct ip *iph;
11251
11252 #ifdef INET6
11253         struct ip6_hdr *ip6h;
11254
11255 #endif
11256         int fullsz = 0, extra = 0;
11257         long spc;
11258         int offset;
11259         struct sctp_chunkhdr *ch, chunk_buf;
11260         unsigned int chk_length;
11261
11262         if (!stcb) {
11263                 return;
11264         }
11265         asoc = &stcb->asoc;
11266         SCTP_TCB_LOCK_ASSERT(stcb);
11267         if (asoc->peer_supports_pktdrop == 0) {
11268                 /*-
11269                  * peer must declare support before I send one.
11270                  */
11271                 return;
11272         }
11273         if (stcb->sctp_socket == NULL) {
11274                 return;
11275         }
11276         sctp_alloc_a_chunk(stcb, chk);
11277         if (chk == NULL) {
11278                 return;
11279         }
11280         chk->copy_by_ref = 0;
11281         iph = mtod(m, struct ip *);
11282         if (iph == NULL) {
11283                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11284                 return;
11285         }
11286         switch (iph->ip_v) {
11287 #ifdef INET
11288         case IPVERSION:
11289                 /* IPv4 */
11290                 len = chk->send_size = iph->ip_len;
11291                 break;
11292 #endif
11293 #ifdef INET6
11294         case IPV6_VERSION >> 4:
11295                 /* IPv6 */
11296                 ip6h = mtod(m, struct ip6_hdr *);
11297                 len = chk->send_size = htons(ip6h->ip6_plen);
11298                 break;
11299 #endif
11300         default:
11301                 return;
11302         }
11303         /* Validate that we do not have an ABORT in here. */
11304         offset = iphlen + sizeof(struct sctphdr);
11305         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11306             sizeof(*ch), (uint8_t *) & chunk_buf);
11307         while (ch != NULL) {
11308                 chk_length = ntohs(ch->chunk_length);
11309                 if (chk_length < sizeof(*ch)) {
11310                         /* break to abort land */
11311                         break;
11312                 }
11313                 switch (ch->chunk_type) {
11314                 case SCTP_PACKET_DROPPED:
11315                 case SCTP_ABORT_ASSOCIATION:
11316                 case SCTP_INITIATION_ACK:
11317                         /**
11318                          * We don't respond with an PKT-DROP to an ABORT
11319                          * or PKT-DROP. We also do not respond to an
11320                          * INIT-ACK, because we can't know if the initiation
11321                          * tag is correct or not.
11322                          */
11323                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11324                         return;
11325                 default:
11326                         break;
11327                 }
11328                 offset += SCTP_SIZE32(chk_length);
11329                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11330                     sizeof(*ch), (uint8_t *) & chunk_buf);
11331         }
11332
11333         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11334             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11335                 /*
11336                  * only send 1 mtu worth, trim off the excess on the end.
11337                  */
11338                 fullsz = len - extra;
11339                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11340                 was_trunc = 1;
11341         }
11342         chk->asoc = &stcb->asoc;
11343         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11344         if (chk->data == NULL) {
11345 jump_out:
11346                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11347                 return;
11348         }
11349         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11350         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11351         if (drp == NULL) {
11352                 sctp_m_freem(chk->data);
11353                 chk->data = NULL;
11354                 goto jump_out;
11355         }
11356         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11357             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11358         chk->book_size_scale = 0;
11359         if (was_trunc) {
11360                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11361                 drp->trunc_len = htons(fullsz);
11362                 /*
11363                  * Len is already adjusted to size minus overhead above take
11364                  * out the pkt_drop chunk itself from it.
11365                  */
11366                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11367                 len = chk->send_size;
11368         } else {
11369                 /* no truncation needed */
11370                 drp->ch.chunk_flags = 0;
11371                 drp->trunc_len = htons(0);
11372         }
11373         if (bad_crc) {
11374                 drp->ch.chunk_flags |= SCTP_BADCRC;
11375         }
11376         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11377         SCTP_BUF_LEN(chk->data) = chk->send_size;
11378         chk->sent = SCTP_DATAGRAM_UNSENT;
11379         chk->snd_count = 0;
11380         if (net) {
11381                 /* we should hit here */
11382                 chk->whoTo = net;
11383                 atomic_add_int(&chk->whoTo->ref_count, 1);
11384         } else {
11385                 chk->whoTo = NULL;
11386         }
11387         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11388         chk->rec.chunk_id.can_take_data = 1;
11389         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11390         drp->ch.chunk_length = htons(chk->send_size);
11391         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11392         if (spc < 0) {
11393                 spc = 0;
11394         }
11395         drp->bottle_bw = htonl(spc);
11396         if (asoc->my_rwnd) {
11397                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11398                     asoc->size_on_all_streams +
11399                     asoc->my_rwnd_control_len +
11400                     stcb->sctp_socket->so_rcv.sb_cc);
11401         } else {
11402                 /*-
11403                  * If my rwnd is 0, possibly from mbuf depletion as well as
11404                  * space used, tell the peer there is NO space aka onq == bw
11405                  */
11406                 drp->current_onq = htonl(spc);
11407         }
11408         drp->reserved = 0;
11409         datap = drp->data;
11410         m_copydata(m, iphlen, len, (caddr_t)datap);
11411         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11412         asoc->ctrl_queue_cnt++;
11413 }
11414
11415 void
11416 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11417 {
11418         struct sctp_association *asoc;
11419         struct sctp_cwr_chunk *cwr;
11420         struct sctp_tmit_chunk *chk;
11421
11422         asoc = &stcb->asoc;
11423         SCTP_TCB_LOCK_ASSERT(stcb);
11424         if (net == NULL) {
11425                 return;
11426         }
11427         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11428                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11429                         /*
11430                          * found a previous CWR queued to same destination
11431                          * update it if needed
11432                          */
11433                         uint32_t ctsn;
11434
11435                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11436                         ctsn = ntohl(cwr->tsn);
11437                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11438                                 cwr->tsn = htonl(high_tsn);
11439                         }
11440                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11441                                 /* Make sure override is carried */
11442                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11443                         }
11444                         return;
11445                 }
11446         }
11447         sctp_alloc_a_chunk(stcb, chk);
11448         if (chk == NULL) {
11449                 return;
11450         }
11451         chk->copy_by_ref = 0;
11452         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11453         chk->rec.chunk_id.can_take_data = 1;
11454         chk->asoc = &stcb->asoc;
11455         chk->send_size = sizeof(struct sctp_cwr_chunk);
11456         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11457         if (chk->data == NULL) {
11458                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11459                 return;
11460         }
11461         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11462         SCTP_BUF_LEN(chk->data) = chk->send_size;
11463         chk->sent = SCTP_DATAGRAM_UNSENT;
11464         chk->snd_count = 0;
11465         chk->whoTo = net;
11466         atomic_add_int(&chk->whoTo->ref_count, 1);
11467         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11468         cwr->ch.chunk_type = SCTP_ECN_CWR;
11469         cwr->ch.chunk_flags = override;
11470         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11471         cwr->tsn = htonl(high_tsn);
11472         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11473         asoc->ctrl_queue_cnt++;
11474 }
11475
11476 void
11477 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11478     int number_entries, uint16_t * list,
11479     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11480 {
11481         int len, old_len, i;
11482         struct sctp_stream_reset_out_request *req_out;
11483         struct sctp_chunkhdr *ch;
11484
11485         ch = mtod(chk->data, struct sctp_chunkhdr *);
11486
11487
11488         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11489
11490         /* get to new offset for the param. */
11491         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11492         /* now how long will this param be? */
11493         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11494         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11495         req_out->ph.param_length = htons(len);
11496         req_out->request_seq = htonl(seq);
11497         req_out->response_seq = htonl(resp_seq);
11498         req_out->send_reset_at_tsn = htonl(last_sent);
11499         if (number_entries) {
11500                 for (i = 0; i < number_entries; i++) {
11501                         req_out->list_of_streams[i] = htons(list[i]);
11502                 }
11503         }
11504         if (SCTP_SIZE32(len) > len) {
11505                 /*-
11506                  * Need to worry about the pad we may end up adding to the
11507                  * end. This is easy since the struct is either aligned to 4
11508                  * bytes or 2 bytes off.
11509                  */
11510                 req_out->list_of_streams[number_entries] = 0;
11511         }
11512         /* now fix the chunk length */
11513         ch->chunk_length = htons(len + old_len);
11514         chk->book_size = len + old_len;
11515         chk->book_size_scale = 0;
11516         chk->send_size = SCTP_SIZE32(chk->book_size);
11517         SCTP_BUF_LEN(chk->data) = chk->send_size;
11518         return;
11519 }
11520
11521
11522 void
11523 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11524     int number_entries, uint16_t * list,
11525     uint32_t seq)
11526 {
11527         int len, old_len, i;
11528         struct sctp_stream_reset_in_request *req_in;
11529         struct sctp_chunkhdr *ch;
11530
11531         ch = mtod(chk->data, struct sctp_chunkhdr *);
11532
11533
11534         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11535
11536         /* get to new offset for the param. */
11537         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11538         /* now how long will this param be? */
11539         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11540         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11541         req_in->ph.param_length = htons(len);
11542         req_in->request_seq = htonl(seq);
11543         if (number_entries) {
11544                 for (i = 0; i < number_entries; i++) {
11545                         req_in->list_of_streams[i] = htons(list[i]);
11546                 }
11547         }
11548         if (SCTP_SIZE32(len) > len) {
11549                 /*-
11550                  * Need to worry about the pad we may end up adding to the
11551                  * end. This is easy since the struct is either aligned to 4
11552                  * bytes or 2 bytes off.
11553                  */
11554                 req_in->list_of_streams[number_entries] = 0;
11555         }
11556         /* now fix the chunk length */
11557         ch->chunk_length = htons(len + old_len);
11558         chk->book_size = len + old_len;
11559         chk->book_size_scale = 0;
11560         chk->send_size = SCTP_SIZE32(chk->book_size);
11561         SCTP_BUF_LEN(chk->data) = chk->send_size;
11562         return;
11563 }
11564
11565
11566 void
11567 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11568     uint32_t seq)
11569 {
11570         int len, old_len;
11571         struct sctp_stream_reset_tsn_request *req_tsn;
11572         struct sctp_chunkhdr *ch;
11573
11574         ch = mtod(chk->data, struct sctp_chunkhdr *);
11575
11576
11577         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11578
11579         /* get to new offset for the param. */
11580         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11581         /* now how long will this param be? */
11582         len = sizeof(struct sctp_stream_reset_tsn_request);
11583         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11584         req_tsn->ph.param_length = htons(len);
11585         req_tsn->request_seq = htonl(seq);
11586
11587         /* now fix the chunk length */
11588         ch->chunk_length = htons(len + old_len);
11589         chk->send_size = len + old_len;
11590         chk->book_size = SCTP_SIZE32(chk->send_size);
11591         chk->book_size_scale = 0;
11592         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11593         return;
11594 }
11595
11596 void
11597 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11598     uint32_t resp_seq, uint32_t result)
11599 {
11600         int len, old_len;
11601         struct sctp_stream_reset_response *resp;
11602         struct sctp_chunkhdr *ch;
11603
11604         ch = mtod(chk->data, struct sctp_chunkhdr *);
11605
11606
11607         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11608
11609         /* get to new offset for the param. */
11610         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11611         /* now how long will this param be? */
11612         len = sizeof(struct sctp_stream_reset_response);
11613         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11614         resp->ph.param_length = htons(len);
11615         resp->response_seq = htonl(resp_seq);
11616         resp->result = ntohl(result);
11617
11618         /* now fix the chunk length */
11619         ch->chunk_length = htons(len + old_len);
11620         chk->book_size = len + old_len;
11621         chk->book_size_scale = 0;
11622         chk->send_size = SCTP_SIZE32(chk->book_size);
11623         SCTP_BUF_LEN(chk->data) = chk->send_size;
11624         return;
11625
11626 }
11627
11628
11629 void
11630 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11631     uint32_t resp_seq, uint32_t result,
11632     uint32_t send_una, uint32_t recv_next)
11633 {
11634         int len, old_len;
11635         struct sctp_stream_reset_response_tsn *resp;
11636         struct sctp_chunkhdr *ch;
11637
11638         ch = mtod(chk->data, struct sctp_chunkhdr *);
11639
11640
11641         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11642
11643         /* get to new offset for the param. */
11644         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11645         /* now how long will this param be? */
11646         len = sizeof(struct sctp_stream_reset_response_tsn);
11647         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11648         resp->ph.param_length = htons(len);
11649         resp->response_seq = htonl(resp_seq);
11650         resp->result = htonl(result);
11651         resp->senders_next_tsn = htonl(send_una);
11652         resp->receivers_next_tsn = htonl(recv_next);
11653
11654         /* now fix the chunk length */
11655         ch->chunk_length = htons(len + old_len);
11656         chk->book_size = len + old_len;
11657         chk->send_size = SCTP_SIZE32(chk->book_size);
11658         chk->book_size_scale = 0;
11659         SCTP_BUF_LEN(chk->data) = chk->send_size;
11660         return;
11661 }
11662
11663 static void
11664 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11665     uint32_t seq,
11666     uint16_t adding)
11667 {
11668         int len, old_len;
11669         struct sctp_chunkhdr *ch;
11670         struct sctp_stream_reset_add_strm *addstr;
11671
11672         ch = mtod(chk->data, struct sctp_chunkhdr *);
11673         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11674
11675         /* get to new offset for the param. */
11676         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11677         /* now how long will this param be? */
11678         len = sizeof(struct sctp_stream_reset_add_strm);
11679
11680         /* Fill it out. */
11681         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11682         addstr->ph.param_length = htons(len);
11683         addstr->request_seq = htonl(seq);
11684         addstr->number_of_streams = htons(adding);
11685         addstr->reserved = 0;
11686
11687         /* now fix the chunk length */
11688         ch->chunk_length = htons(len + old_len);
11689         chk->send_size = len + old_len;
11690         chk->book_size = SCTP_SIZE32(chk->send_size);
11691         chk->book_size_scale = 0;
11692         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11693         return;
11694 }
11695
11696 int
11697 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11698     int number_entries, uint16_t * list,
11699     uint8_t send_out_req,
11700     uint32_t resp_seq,
11701     uint8_t send_in_req,
11702     uint8_t send_tsn_req,
11703     uint8_t add_stream,
11704     uint16_t adding
11705 )
11706 {
11707
11708         struct sctp_association *asoc;
11709         struct sctp_tmit_chunk *chk;
11710         struct sctp_chunkhdr *ch;
11711         uint32_t seq;
11712
11713         asoc = &stcb->asoc;
11714         if (asoc->stream_reset_outstanding) {
11715                 /*-
11716                  * Already one pending, must get ACK back to clear the flag.
11717                  */
11718                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11719                 return (EBUSY);
11720         }
11721         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11722             (add_stream == 0)) {
11723                 /* nothing to do */
11724                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11725                 return (EINVAL);
11726         }
11727         if (send_tsn_req && (send_out_req || send_in_req)) {
11728                 /* error, can't do that */
11729                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11730                 return (EINVAL);
11731         }
11732         sctp_alloc_a_chunk(stcb, chk);
11733         if (chk == NULL) {
11734                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11735                 return (ENOMEM);
11736         }
11737         chk->copy_by_ref = 0;
11738         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11739         chk->rec.chunk_id.can_take_data = 0;
11740         chk->asoc = &stcb->asoc;
11741         chk->book_size = sizeof(struct sctp_chunkhdr);
11742         chk->send_size = SCTP_SIZE32(chk->book_size);
11743         chk->book_size_scale = 0;
11744
11745         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11746         if (chk->data == NULL) {
11747                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11748                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11749                 return (ENOMEM);
11750         }
11751         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11752
11753         /* setup chunk parameters */
11754         chk->sent = SCTP_DATAGRAM_UNSENT;
11755         chk->snd_count = 0;
11756         if (stcb->asoc.alternate) {
11757                 chk->whoTo = stcb->asoc.alternate;
11758         } else {
11759                 chk->whoTo = stcb->asoc.primary_destination;
11760         }
11761         atomic_add_int(&chk->whoTo->ref_count, 1);
11762         ch = mtod(chk->data, struct sctp_chunkhdr *);
11763         ch->chunk_type = SCTP_STREAM_RESET;
11764         ch->chunk_flags = 0;
11765         ch->chunk_length = htons(chk->book_size);
11766         SCTP_BUF_LEN(chk->data) = chk->send_size;
11767
11768         seq = stcb->asoc.str_reset_seq_out;
11769         if (send_out_req) {
11770                 sctp_add_stream_reset_out(chk, number_entries, list,
11771                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11772                 asoc->stream_reset_out_is_outstanding = 1;
11773                 seq++;
11774                 asoc->stream_reset_outstanding++;
11775         }
11776         if (add_stream) {
11777                 sctp_add_a_stream(chk, seq, adding);
11778                 seq++;
11779                 asoc->stream_reset_outstanding++;
11780         }
11781         if (send_in_req) {
11782                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11783                 asoc->stream_reset_outstanding++;
11784         }
11785         if (send_tsn_req) {
11786                 sctp_add_stream_reset_tsn(chk, seq);
11787                 asoc->stream_reset_outstanding++;
11788         }
11789         asoc->str_reset = chk;
11790
11791         /* insert the chunk for sending */
11792         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11793             chk,
11794             sctp_next);
11795         asoc->ctrl_queue_cnt++;
11796         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11797         return (0);
11798 }
11799
11800 void
11801 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11802     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11803 {
11804         /*-
11805          * Formulate the abort message, and send it back down.
11806          */
11807         struct mbuf *o_pak;
11808         struct mbuf *mout;
11809         struct sctp_abort_msg *abm;
11810         struct ip *iph;
11811         struct udphdr *udp;
11812         int iphlen_out, len;
11813
11814 #ifdef INET
11815         struct ip *iph_out;
11816
11817 #endif
11818 #ifdef INET6
11819         struct ip6_hdr *ip6, *ip6_out;
11820
11821 #endif
11822
11823         /* don't respond to ABORT with ABORT */
11824         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11825                 if (err_cause)
11826                         sctp_m_freem(err_cause);
11827                 return;
11828         }
11829         iph = mtod(m, struct ip *);
11830         switch (iph->ip_v) {
11831 #ifdef INET
11832         case IPVERSION:
11833                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11834                 break;
11835 #endif
11836 #ifdef INET6
11837         case IPV6_VERSION >> 4:
11838                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11839                 break;
11840 #endif
11841         default:
11842                 if (err_cause) {
11843                         sctp_m_freem(err_cause);
11844                 }
11845                 return;
11846         }
11847         if (port) {
11848                 len += sizeof(struct udphdr);
11849         }
11850         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11851         if (mout == NULL) {
11852                 if (err_cause) {
11853                         sctp_m_freem(err_cause);
11854                 }
11855                 return;
11856         }
11857         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11858         SCTP_BUF_LEN(mout) = len;
11859         SCTP_BUF_NEXT(mout) = err_cause;
11860         if (m->m_flags & M_FLOWID) {
11861                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11862                 mout->m_flags |= M_FLOWID;
11863         }
11864 #ifdef INET
11865         iph_out = NULL;
11866 #endif
11867 #ifdef INET6
11868         ip6_out = NULL;
11869 #endif
11870         switch (iph->ip_v) {
11871 #ifdef INET
11872         case IPVERSION:
11873                 iph_out = mtod(mout, struct ip *);
11874
11875                 /* Fill in the IP header for the ABORT */
11876                 iph_out->ip_v = IPVERSION;
11877                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11878                 iph_out->ip_tos = (u_char)0;
11879                 iph_out->ip_id = 0;
11880                 iph_out->ip_off = 0;
11881                 iph_out->ip_ttl = MAXTTL;
11882                 if (port) {
11883                         iph_out->ip_p = IPPROTO_UDP;
11884                 } else {
11885                         iph_out->ip_p = IPPROTO_SCTP;
11886                 }
11887                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11888                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11889                 /* let IP layer calculate this */
11890                 iph_out->ip_sum = 0;
11891
11892                 iphlen_out = sizeof(*iph_out);
11893                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11894                 break;
11895 #endif
11896 #ifdef INET6
11897         case IPV6_VERSION >> 4:
11898                 ip6 = (struct ip6_hdr *)iph;
11899                 ip6_out = mtod(mout, struct ip6_hdr *);
11900
11901                 /* Fill in the IP6 header for the ABORT */
11902                 ip6_out->ip6_flow = ip6->ip6_flow;
11903                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11904                 if (port) {
11905                         ip6_out->ip6_nxt = IPPROTO_UDP;
11906                 } else {
11907                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11908                 }
11909                 ip6_out->ip6_src = ip6->ip6_dst;
11910                 ip6_out->ip6_dst = ip6->ip6_src;
11911
11912                 iphlen_out = sizeof(*ip6_out);
11913                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11914                 break;
11915 #endif                          /* INET6 */
11916         default:
11917                 /* Currently not supported */
11918                 sctp_m_freem(mout);
11919                 return;
11920         }
11921
11922         udp = (struct udphdr *)abm;
11923         if (port) {
11924                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11925                 udp->uh_dport = port;
11926                 /* set udp->uh_ulen later */
11927                 udp->uh_sum = 0;
11928                 iphlen_out += sizeof(struct udphdr);
11929                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11930         }
11931         abm->sh.src_port = sh->dest_port;
11932         abm->sh.dest_port = sh->src_port;
11933         abm->sh.checksum = 0;
11934         if (vtag == 0) {
11935                 abm->sh.v_tag = sh->v_tag;
11936                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11937         } else {
11938                 abm->sh.v_tag = htonl(vtag);
11939                 abm->msg.ch.chunk_flags = 0;
11940         }
11941         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11942
11943         if (err_cause) {
11944                 struct mbuf *m_tmp = err_cause;
11945                 int err_len = 0;
11946
11947                 /* get length of the err_cause chain */
11948                 while (m_tmp != NULL) {
11949                         err_len += SCTP_BUF_LEN(m_tmp);
11950                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11951                 }
11952                 len = SCTP_BUF_LEN(mout) + err_len;
11953                 if (err_len % 4) {
11954                         /* need pad at end of chunk */
11955                         uint32_t cpthis = 0;
11956                         int padlen;
11957
11958                         padlen = 4 - (len % 4);
11959                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11960                         len += padlen;
11961                 }
11962                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11963         } else {
11964                 len = SCTP_BUF_LEN(mout);
11965                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11966         }
11967
11968         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11969                 /* no mbuf's */
11970                 sctp_m_freem(mout);
11971                 return;
11972         }
11973 #ifdef INET
11974         if (iph_out != NULL) {
11975                 sctp_route_t ro;
11976                 int ret;
11977
11978                 /* zap the stack pointer to the route */
11979                 bzero(&ro, sizeof ro);
11980                 if (port) {
11981                         udp->uh_ulen = htons(len - sizeof(struct ip));
11982                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11983                 }
11984                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11985                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11986                 /* set IPv4 length */
11987                 iph_out->ip_len = len;
11988                 /* out it goes */
11989 #ifdef  SCTP_PACKET_LOGGING
11990                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11991                         sctp_packet_log(mout, len);
11992 #endif
11993                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11994                 if (port) {
11995 #if defined(SCTP_WITH_NO_CSUM)
11996                         SCTP_STAT_INCR(sctps_sendnocrc);
11997 #else
11998                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11999                         SCTP_STAT_INCR(sctps_sendswcrc);
12000 #endif
12001                         SCTP_ENABLE_UDP_CSUM(o_pak);
12002                 } else {
12003 #if defined(SCTP_WITH_NO_CSUM)
12004                         SCTP_STAT_INCR(sctps_sendnocrc);
12005 #else
12006                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12007                         mout->m_pkthdr.csum_data = 0;
12008                         SCTP_STAT_INCR(sctps_sendhwcrc);
12009 #endif
12010                 }
12011                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12012
12013                 /* Free the route if we got one back */
12014                 if (ro.ro_rt)
12015                         RTFREE(ro.ro_rt);
12016         }
12017 #endif
12018 #ifdef INET6
12019         if (ip6_out != NULL) {
12020                 struct route_in6 ro;
12021                 int ret;
12022                 struct ifnet *ifp = NULL;
12023
12024                 /* zap the stack pointer to the route */
12025                 bzero(&ro, sizeof(ro));
12026                 if (port) {
12027                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12028                 }
12029                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
12030                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
12031                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12032 #ifdef  SCTP_PACKET_LOGGING
12033                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12034                         sctp_packet_log(mout, len);
12035 #endif
12036                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12037                 if (port) {
12038 #if defined(SCTP_WITH_NO_CSUM)
12039                         SCTP_STAT_INCR(sctps_sendnocrc);
12040 #else
12041                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12042                         SCTP_STAT_INCR(sctps_sendswcrc);
12043 #endif
12044                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12045                                 udp->uh_sum = 0xffff;
12046                         }
12047                 } else {
12048 #if defined(SCTP_WITH_NO_CSUM)
12049                         SCTP_STAT_INCR(sctps_sendnocrc);
12050 #else
12051                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12052                         mout->m_pkthdr.csum_data = 0;
12053                         SCTP_STAT_INCR(sctps_sendhwcrc);
12054 #endif
12055                 }
12056                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12057
12058                 /* Free the route if we got one back */
12059                 if (ro.ro_rt)
12060                         RTFREE(ro.ro_rt);
12061         }
12062 #endif
12063         SCTP_STAT_INCR(sctps_sendpackets);
12064         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12065         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12066 }
12067
12068 void
12069 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12070     uint32_t vrf_id, uint16_t port)
12071 {
12072         struct mbuf *o_pak;
12073         struct sctphdr *sh, *sh_out;
12074         struct sctp_chunkhdr *ch;
12075         struct ip *iph;
12076         struct udphdr *udp = NULL;
12077         struct mbuf *mout;
12078         int iphlen_out, len;
12079
12080 #ifdef INET
12081         struct ip *iph_out;
12082
12083 #endif
12084 #ifdef INET6
12085         struct ip6_hdr *ip6, *ip6_out;
12086
12087 #endif
12088
12089         iph = mtod(m, struct ip *);
12090         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12091         switch (iph->ip_v) {
12092 #ifdef INET
12093         case IPVERSION:
12094                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12095                 break;
12096 #endif
12097 #ifdef INET6
12098         case IPV6_VERSION >> 4:
12099                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12100                 break;
12101 #endif
12102         default:
12103                 if (scm) {
12104                         sctp_m_freem(scm);
12105                 }
12106                 return;
12107         }
12108         if (port) {
12109                 len += sizeof(struct udphdr);
12110         }
12111         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12112         if (mout == NULL) {
12113                 if (scm) {
12114                         sctp_m_freem(scm);
12115                 }
12116                 return;
12117         }
12118         SCTP_BUF_RESV_UF(mout, max_linkhdr);
12119         SCTP_BUF_LEN(mout) = len;
12120         SCTP_BUF_NEXT(mout) = scm;
12121         if (m->m_flags & M_FLOWID) {
12122                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12123                 mout->m_flags |= M_FLOWID;
12124         }
12125 #ifdef INET
12126         iph_out = NULL;
12127 #endif
12128 #ifdef INET6
12129         ip6_out = NULL;
12130 #endif
12131         switch (iph->ip_v) {
12132 #ifdef INET
12133         case IPVERSION:
12134                 iph_out = mtod(mout, struct ip *);
12135
12136                 /* Fill in the IP header for the ABORT */
12137                 iph_out->ip_v = IPVERSION;
12138                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12139                 iph_out->ip_tos = (u_char)0;
12140                 iph_out->ip_id = 0;
12141                 iph_out->ip_off = 0;
12142                 iph_out->ip_ttl = MAXTTL;
12143                 if (port) {
12144                         iph_out->ip_p = IPPROTO_UDP;
12145                 } else {
12146                         iph_out->ip_p = IPPROTO_SCTP;
12147                 }
12148                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12149                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12150                 /* let IP layer calculate this */
12151                 iph_out->ip_sum = 0;
12152
12153                 iphlen_out = sizeof(struct ip);
12154                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12155                 break;
12156 #endif
12157 #ifdef INET6
12158         case IPV6_VERSION >> 4:
12159                 ip6 = (struct ip6_hdr *)iph;
12160                 ip6_out = mtod(mout, struct ip6_hdr *);
12161
12162                 /* Fill in the IP6 header for the ABORT */
12163                 ip6_out->ip6_flow = ip6->ip6_flow;
12164                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12165                 if (port) {
12166                         ip6_out->ip6_nxt = IPPROTO_UDP;
12167                 } else {
12168                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12169                 }
12170                 ip6_out->ip6_src = ip6->ip6_dst;
12171                 ip6_out->ip6_dst = ip6->ip6_src;
12172
12173                 iphlen_out = sizeof(struct ip6_hdr);
12174                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12175                 break;
12176 #endif                          /* INET6 */
12177         default:
12178                 /* Currently not supported */
12179                 sctp_m_freem(mout);
12180                 return;
12181         }
12182
12183         udp = (struct udphdr *)sh_out;
12184         if (port) {
12185                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12186                 udp->uh_dport = port;
12187                 /* set udp->uh_ulen later */
12188                 udp->uh_sum = 0;
12189                 iphlen_out += sizeof(struct udphdr);
12190                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12191         }
12192         sh_out->src_port = sh->dest_port;
12193         sh_out->dest_port = sh->src_port;
12194         sh_out->v_tag = vtag;
12195         sh_out->checksum = 0;
12196
12197         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12198         ch->chunk_type = SCTP_OPERATION_ERROR;
12199         ch->chunk_flags = 0;
12200
12201         if (scm) {
12202                 struct mbuf *m_tmp = scm;
12203                 int cause_len = 0;
12204
12205                 /* get length of the err_cause chain */
12206                 while (m_tmp != NULL) {
12207                         cause_len += SCTP_BUF_LEN(m_tmp);
12208                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12209                 }
12210                 len = SCTP_BUF_LEN(mout) + cause_len;
12211                 if (cause_len % 4) {
12212                         /* need pad at end of chunk */
12213                         uint32_t cpthis = 0;
12214                         int padlen;
12215
12216                         padlen = 4 - (len % 4);
12217                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12218                         len += padlen;
12219                 }
12220                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12221         } else {
12222                 len = SCTP_BUF_LEN(mout);
12223                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12224         }
12225
12226         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12227                 /* no mbuf's */
12228                 sctp_m_freem(mout);
12229                 return;
12230         }
12231 #ifdef INET
12232         if (iph_out != NULL) {
12233                 sctp_route_t ro;
12234                 int ret;
12235
12236                 /* zap the stack pointer to the route */
12237                 bzero(&ro, sizeof ro);
12238                 if (port) {
12239                         udp->uh_ulen = htons(len - sizeof(struct ip));
12240                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12241                 }
12242                 /* set IPv4 length */
12243                 iph_out->ip_len = len;
12244                 /* out it goes */
12245 #ifdef  SCTP_PACKET_LOGGING
12246                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12247                         sctp_packet_log(mout, len);
12248 #endif
12249                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12250                 if (port) {
12251 #if defined(SCTP_WITH_NO_CSUM)
12252                         SCTP_STAT_INCR(sctps_sendnocrc);
12253 #else
12254                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12255                         SCTP_STAT_INCR(sctps_sendswcrc);
12256 #endif
12257                         SCTP_ENABLE_UDP_CSUM(o_pak);
12258                 } else {
12259 #if defined(SCTP_WITH_NO_CSUM)
12260                         SCTP_STAT_INCR(sctps_sendnocrc);
12261 #else
12262                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12263                         mout->m_pkthdr.csum_data = 0;
12264                         SCTP_STAT_INCR(sctps_sendhwcrc);
12265 #endif
12266                 }
12267                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12268
12269                 /* Free the route if we got one back */
12270                 if (ro.ro_rt)
12271                         RTFREE(ro.ro_rt);
12272         }
12273 #endif
12274 #ifdef INET6
12275         if (ip6_out != NULL) {
12276                 struct route_in6 ro;
12277                 int ret;
12278                 struct ifnet *ifp = NULL;
12279
12280                 /* zap the stack pointer to the route */
12281                 bzero(&ro, sizeof(ro));
12282                 if (port) {
12283                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12284                 }
12285                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12286 #ifdef  SCTP_PACKET_LOGGING
12287                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12288                         sctp_packet_log(mout, len);
12289 #endif
12290                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12291                 if (port) {
12292 #if defined(SCTP_WITH_NO_CSUM)
12293                         SCTP_STAT_INCR(sctps_sendnocrc);
12294 #else
12295                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12296                         SCTP_STAT_INCR(sctps_sendswcrc);
12297 #endif
12298                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12299                                 udp->uh_sum = 0xffff;
12300                         }
12301                 } else {
12302 #if defined(SCTP_WITH_NO_CSUM)
12303                         SCTP_STAT_INCR(sctps_sendnocrc);
12304 #else
12305                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12306                         mout->m_pkthdr.csum_data = 0;
12307                         SCTP_STAT_INCR(sctps_sendhwcrc);
12308 #endif
12309                 }
12310                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12311
12312                 /* Free the route if we got one back */
12313                 if (ro.ro_rt)
12314                         RTFREE(ro.ro_rt);
12315         }
12316 #endif
12317         SCTP_STAT_INCR(sctps_sendpackets);
12318         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12319         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12320 }
12321
12322 static struct mbuf *
12323 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
12324     struct uio *uio,
12325     struct sctp_sndrcvinfo *srcv,
12326     int max_send_len,
12327     int user_marks_eor,
12328     int *error,
12329     uint32_t * sndout,
12330     struct mbuf **new_tail)
12331 {
12332         struct mbuf *m;
12333
12334         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12335             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12336         if (m == NULL) {
12337                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12338                 *error = ENOMEM;
12339         } else {
12340                 *sndout = m_length(m, NULL);
12341                 *new_tail = m_last(m);
12342         }
12343         return (m);
12344 }
12345
12346 static int
12347 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12348     struct uio *uio,
12349     int resv_upfront)
12350 {
12351         int left;
12352
12353         left = sp->length;
12354         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12355             resv_upfront, 0);
12356         if (sp->data == NULL) {
12357                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12358                 return (ENOMEM);
12359         }
12360         sp->tail_mbuf = m_last(sp->data);
12361         return (0);
12362 }
12363
12364
12365
12366 static struct sctp_stream_queue_pending *
12367 sctp_copy_it_in(struct sctp_tcb *stcb,
12368     struct sctp_association *asoc,
12369     struct sctp_sndrcvinfo *srcv,
12370     struct uio *uio,
12371     struct sctp_nets *net,
12372     int max_send_len,
12373     int user_marks_eor,
12374     int *error,
12375     int non_blocking)
12376 {
12377         /*-
12378          * This routine must be very careful in its work. Protocol
12379          * processing is up and running so care must be taken to spl...()
12380          * when you need to do something that may effect the stcb/asoc. The
12381          * sb is locked however. When data is copied the protocol processing
12382          * should be enabled since this is a slower operation...
12383          */
12384         struct sctp_stream_queue_pending *sp = NULL;
12385         int resv_in_first;
12386
12387         *error = 0;
12388         /* Now can we send this? */
12389         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12390             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12391             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12392             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12393                 /* got data while shutting down */
12394                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12395                 *error = ECONNRESET;
12396                 goto out_now;
12397         }
12398         sctp_alloc_a_strmoq(stcb, sp);
12399         if (sp == NULL) {
12400                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12401                 *error = ENOMEM;
12402                 goto out_now;
12403         }
12404         sp->act_flags = 0;
12405         sp->sender_all_done = 0;
12406         sp->sinfo_flags = srcv->sinfo_flags;
12407         sp->timetolive = srcv->sinfo_timetolive;
12408         sp->ppid = srcv->sinfo_ppid;
12409         sp->context = srcv->sinfo_context;
12410         sp->strseq = 0;
12411         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12412
12413         sp->stream = srcv->sinfo_stream;
12414         sp->length = min(uio->uio_resid, max_send_len);
12415         if ((sp->length == (uint32_t) uio->uio_resid) &&
12416             ((user_marks_eor == 0) ||
12417             (srcv->sinfo_flags & SCTP_EOF) ||
12418             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12419                 sp->msg_is_complete = 1;
12420         } else {
12421                 sp->msg_is_complete = 0;
12422         }
12423         sp->sender_all_done = 0;
12424         sp->some_taken = 0;
12425         sp->put_last_out = 0;
12426         resv_in_first = sizeof(struct sctp_data_chunk);
12427         sp->data = sp->tail_mbuf = NULL;
12428         if (sp->length == 0) {
12429                 *error = 0;
12430                 goto skip_copy;
12431         }
12432         if (srcv->sinfo_keynumber_valid) {
12433                 sp->auth_keyid = srcv->sinfo_keynumber;
12434         } else {
12435                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12436         }
12437         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12438                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12439                 sp->holds_key_ref = 1;
12440         }
12441         *error = sctp_copy_one(sp, uio, resv_in_first);
12442 skip_copy:
12443         if (*error) {
12444                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12445                 sp = NULL;
12446         } else {
12447                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12448                         sp->net = net;
12449                         atomic_add_int(&sp->net->ref_count, 1);
12450                 } else {
12451                         sp->net = NULL;
12452                 }
12453                 sctp_set_prsctp_policy(sp);
12454         }
12455 out_now:
12456         return (sp);
12457 }
12458
12459
12460 int
12461 sctp_sosend(struct socket *so,
12462     struct sockaddr *addr,
12463     struct uio *uio,
12464     struct mbuf *top,
12465     struct mbuf *control,
12466     int flags,
12467     struct thread *p
12468 )
12469 {
12470         int error, use_sndinfo = 0;
12471         struct sctp_sndrcvinfo sndrcvninfo;
12472         struct sockaddr *addr_to_use;
12473
12474 #if defined(INET) && defined(INET6)
12475         struct sockaddr_in sin;
12476
12477 #endif
12478
12479         if (control) {
12480                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12481                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12482                     sizeof(sndrcvninfo))) {
12483                         /* got one */
12484                         use_sndinfo = 1;
12485                 }
12486         }
12487         addr_to_use = addr;
12488 #if defined(INET) && defined(INET6)
12489         if ((addr) && (addr->sa_family == AF_INET6)) {
12490                 struct sockaddr_in6 *sin6;
12491
12492                 sin6 = (struct sockaddr_in6 *)addr;
12493                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12494                         in6_sin6_2_sin(&sin, sin6);
12495                         addr_to_use = (struct sockaddr *)&sin;
12496                 }
12497         }
12498 #endif
12499         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12500             control,
12501             flags,
12502             use_sndinfo ? &sndrcvninfo : NULL
12503             ,p
12504             );
12505         return (error);
12506 }
12507
12508
12509 int
12510 sctp_lower_sosend(struct socket *so,
12511     struct sockaddr *addr,
12512     struct uio *uio,
12513     struct mbuf *i_pak,
12514     struct mbuf *control,
12515     int flags,
12516     struct sctp_sndrcvinfo *srcv
12517     ,
12518     struct thread *p
12519 )
12520 {
12521         unsigned int sndlen = 0, max_len;
12522         int error, len;
12523         struct mbuf *top = NULL;
12524         int queue_only = 0, queue_only_for_init = 0;
12525         int free_cnt_applied = 0;
12526         int un_sent;
12527         int now_filled = 0;
12528         unsigned int inqueue_bytes = 0;
12529         struct sctp_block_entry be;
12530         struct sctp_inpcb *inp;
12531         struct sctp_tcb *stcb = NULL;
12532         struct timeval now;
12533         struct sctp_nets *net;
12534         struct sctp_association *asoc;
12535         struct sctp_inpcb *t_inp;
12536         int user_marks_eor;
12537         int create_lock_applied = 0;
12538         int nagle_applies = 0;
12539         int some_on_control = 0;
12540         int got_all_of_the_send = 0;
12541         int hold_tcblock = 0;
12542         int non_blocking = 0;
12543         uint32_t local_add_more, local_soresv = 0;
12544         uint16_t port;
12545         uint16_t sinfo_flags;
12546         sctp_assoc_t sinfo_assoc_id;
12547
12548         error = 0;
12549         net = NULL;
12550         stcb = NULL;
12551         asoc = NULL;
12552
12553         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12554         if (inp == NULL) {
12555                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12556                 error = EINVAL;
12557                 if (i_pak) {
12558                         SCTP_RELEASE_PKT(i_pak);
12559                 }
12560                 return (error);
12561         }
12562         if ((uio == NULL) && (i_pak == NULL)) {
12563                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12564                 return (EINVAL);
12565         }
12566         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12567         atomic_add_int(&inp->total_sends, 1);
12568         if (uio) {
12569                 if (uio->uio_resid < 0) {
12570                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12571                         return (EINVAL);
12572                 }
12573                 sndlen = uio->uio_resid;
12574         } else {
12575                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12576                 sndlen = SCTP_HEADER_LEN(i_pak);
12577         }
12578         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12579             addr,
12580             sndlen);
12581         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12582             (inp->sctp_socket->so_qlimit)) {
12583                 /* The listener can NOT send */
12584                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12585                 error = ENOTCONN;
12586                 goto out_unlocked;
12587         }
12588         /**
12589          * Pre-screen address, if one is given the sin-len
12590          * must be set correctly!
12591          */
12592         if (addr) {
12593                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12594
12595                 switch (raddr->sa.sa_family) {
12596 #if defined(INET)
12597                 case AF_INET:
12598                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12599                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12600                                 error = EINVAL;
12601                                 goto out_unlocked;
12602                         }
12603                         port = raddr->sin.sin_port;
12604                         break;
12605 #endif
12606 #if defined(INET6)
12607                 case AF_INET6:
12608                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12609                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12610                                 error = EINVAL;
12611                                 goto out_unlocked;
12612                         }
12613                         port = raddr->sin6.sin6_port;
12614                         break;
12615 #endif
12616                 default:
12617                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12618                         error = EAFNOSUPPORT;
12619                         goto out_unlocked;
12620                 }
12621         } else
12622                 port = 0;
12623
12624         if (srcv) {
12625                 sinfo_flags = srcv->sinfo_flags;
12626                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12627                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12628                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12629                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12630                         error = EINVAL;
12631                         goto out_unlocked;
12632                 }
12633                 if (srcv->sinfo_flags)
12634                         SCTP_STAT_INCR(sctps_sends_with_flags);
12635         } else {
12636                 sinfo_flags = inp->def_send.sinfo_flags;
12637                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12638         }
12639         if (sinfo_flags & SCTP_SENDALL) {
12640                 /* its a sendall */
12641                 error = sctp_sendall(inp, uio, top, srcv);
12642                 top = NULL;
12643                 goto out_unlocked;
12644         }
12645         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12646                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12647                 error = EINVAL;
12648                 goto out_unlocked;
12649         }
12650         /* now we must find the assoc */
12651         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12652             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12653                 SCTP_INP_RLOCK(inp);
12654                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12655                 if (stcb) {
12656                         SCTP_TCB_LOCK(stcb);
12657                         hold_tcblock = 1;
12658                 }
12659                 SCTP_INP_RUNLOCK(inp);
12660         } else if (sinfo_assoc_id) {
12661                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12662         } else if (addr) {
12663                 /*-
12664                  * Since we did not use findep we must
12665                  * increment it, and if we don't find a tcb
12666                  * decrement it.
12667                  */
12668                 SCTP_INP_WLOCK(inp);
12669                 SCTP_INP_INCR_REF(inp);
12670                 SCTP_INP_WUNLOCK(inp);
12671                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12672                 if (stcb == NULL) {
12673                         SCTP_INP_WLOCK(inp);
12674                         SCTP_INP_DECR_REF(inp);
12675                         SCTP_INP_WUNLOCK(inp);
12676                 } else {
12677                         hold_tcblock = 1;
12678                 }
12679         }
12680         if ((stcb == NULL) && (addr)) {
12681                 /* Possible implicit send? */
12682                 SCTP_ASOC_CREATE_LOCK(inp);
12683                 create_lock_applied = 1;
12684                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12685                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12686                         /* Should I really unlock ? */
12687                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12688                         error = EINVAL;
12689                         goto out_unlocked;
12690
12691                 }
12692                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12693                     (addr->sa_family == AF_INET6)) {
12694                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12695                         error = EINVAL;
12696                         goto out_unlocked;
12697                 }
12698                 SCTP_INP_WLOCK(inp);
12699                 SCTP_INP_INCR_REF(inp);
12700                 SCTP_INP_WUNLOCK(inp);
12701                 /* With the lock applied look again */
12702                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12703                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12704                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12705                 }
12706                 if (stcb == NULL) {
12707                         SCTP_INP_WLOCK(inp);
12708                         SCTP_INP_DECR_REF(inp);
12709                         SCTP_INP_WUNLOCK(inp);
12710                 } else {
12711                         hold_tcblock = 1;
12712                 }
12713                 if (error) {
12714                         goto out_unlocked;
12715                 }
12716                 if (t_inp != inp) {
12717                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12718                         error = ENOTCONN;
12719                         goto out_unlocked;
12720                 }
12721         }
12722         if (stcb == NULL) {
12723                 if (addr == NULL) {
12724                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12725                         error = ENOENT;
12726                         goto out_unlocked;
12727                 } else {
12728                         /* We must go ahead and start the INIT process */
12729                         uint32_t vrf_id;
12730
12731                         if ((sinfo_flags & SCTP_ABORT) ||
12732                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12733                                 /*-
12734                                  * User asks to abort a non-existant assoc,
12735                                  * or EOF a non-existant assoc with no data
12736                                  */
12737                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12738                                 error = ENOENT;
12739                                 goto out_unlocked;
12740                         }
12741                         /* get an asoc/stcb struct */
12742                         vrf_id = inp->def_vrf_id;
12743 #ifdef INVARIANTS
12744                         if (create_lock_applied == 0) {
12745                                 panic("Error, should hold create lock and I don't?");
12746                         }
12747 #endif
12748                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12749                             p
12750                             );
12751                         if (stcb == NULL) {
12752                                 /* Error is setup for us in the call */
12753                                 goto out_unlocked;
12754                         }
12755                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12756                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12757                                 /*
12758                                  * Set the connected flag so we can queue
12759                                  * data
12760                                  */
12761                                 soisconnecting(so);
12762                         }
12763                         hold_tcblock = 1;
12764                         if (create_lock_applied) {
12765                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12766                                 create_lock_applied = 0;
12767                         } else {
12768                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12769                         }
12770                         /*
12771                          * Turn on queue only flag to prevent data from
12772                          * being sent
12773                          */
12774                         queue_only = 1;
12775                         asoc = &stcb->asoc;
12776                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12777                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12778
12779                         /* initialize authentication params for the assoc */
12780                         sctp_initialize_auth_params(inp, stcb);
12781
12782                         if (control) {
12783                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12784                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12785                                         hold_tcblock = 0;
12786                                         stcb = NULL;
12787                                         goto out_unlocked;
12788                                 }
12789                         }
12790                         /* out with the INIT */
12791                         queue_only_for_init = 1;
12792                         /*-
12793                          * we may want to dig in after this call and adjust the MTU
12794                          * value. It defaulted to 1500 (constant) but the ro
12795                          * structure may now have an update and thus we may need to
12796                          * change it BEFORE we append the message.
12797                          */
12798                 }
12799         } else
12800                 asoc = &stcb->asoc;
12801         if (srcv == NULL)
12802                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12803         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12804                 if (addr)
12805                         net = sctp_findnet(stcb, addr);
12806                 else
12807                         net = NULL;
12808                 if ((net == NULL) ||
12809                     ((port != 0) && (port != stcb->rport))) {
12810                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12811                         error = EINVAL;
12812                         goto out_unlocked;
12813                 }
12814         } else {
12815                 if (stcb->asoc.alternate) {
12816                         net = stcb->asoc.alternate;
12817                 } else {
12818                         net = stcb->asoc.primary_destination;
12819                 }
12820         }
12821         atomic_add_int(&stcb->total_sends, 1);
12822         /* Keep the stcb from being freed under our feet */
12823         atomic_add_int(&asoc->refcnt, 1);
12824         free_cnt_applied = 1;
12825
12826         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12827                 if (sndlen > asoc->smallest_mtu) {
12828                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12829                         error = EMSGSIZE;
12830                         goto out_unlocked;
12831                 }
12832         }
12833         if ((SCTP_SO_IS_NBIO(so)
12834             || (flags & MSG_NBIO)
12835             )) {
12836                 non_blocking = 1;
12837         }
12838         /* would we block? */
12839         if (non_blocking) {
12840                 if (hold_tcblock == 0) {
12841                         SCTP_TCB_LOCK(stcb);
12842                         hold_tcblock = 1;
12843                 }
12844                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12845                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12846                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12847                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12848                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12849                                 error = EMSGSIZE;
12850                         else
12851                                 error = EWOULDBLOCK;
12852                         goto out_unlocked;
12853                 }
12854                 stcb->asoc.sb_send_resv += sndlen;
12855                 SCTP_TCB_UNLOCK(stcb);
12856                 hold_tcblock = 0;
12857         } else {
12858                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12859         }
12860         local_soresv = sndlen;
12861         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12862                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12863                 error = ECONNRESET;
12864                 goto out_unlocked;
12865         }
12866         if (create_lock_applied) {
12867                 SCTP_ASOC_CREATE_UNLOCK(inp);
12868                 create_lock_applied = 0;
12869         }
12870         if (asoc->stream_reset_outstanding) {
12871                 /*
12872                  * Can't queue any data while stream reset is underway.
12873                  */
12874                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12875                 error = EAGAIN;
12876                 goto out_unlocked;
12877         }
12878         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12879             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12880                 queue_only = 1;
12881         }
12882         /* we are now done with all control */
12883         if (control) {
12884                 sctp_m_freem(control);
12885                 control = NULL;
12886         }
12887         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12888             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12889             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12890             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12891                 if (srcv->sinfo_flags & SCTP_ABORT) {
12892                         ;
12893                 } else {
12894                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12895                         error = ECONNRESET;
12896                         goto out_unlocked;
12897                 }
12898         }
12899         /* Ok, we will attempt a msgsnd :> */
12900         if (p) {
12901                 p->td_ru.ru_msgsnd++;
12902         }
12903         /* Are we aborting? */
12904         if (srcv->sinfo_flags & SCTP_ABORT) {
12905                 struct mbuf *mm;
12906                 int tot_demand, tot_out = 0, max_out;
12907
12908                 SCTP_STAT_INCR(sctps_sends_with_abort);
12909                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12910                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12911                         /* It has to be up before we abort */
12912                         /* how big is the user initiated abort? */
12913                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12914                         error = EINVAL;
12915                         goto out;
12916                 }
12917                 if (hold_tcblock) {
12918                         SCTP_TCB_UNLOCK(stcb);
12919                         hold_tcblock = 0;
12920                 }
12921                 if (top) {
12922                         struct mbuf *cntm = NULL;
12923
12924                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12925                         if (sndlen != 0) {
12926                                 cntm = top;
12927                                 while (cntm) {
12928                                         tot_out += SCTP_BUF_LEN(cntm);
12929                                         cntm = SCTP_BUF_NEXT(cntm);
12930                                 }
12931                         }
12932                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12933                 } else {
12934                         /* Must fit in a MTU */
12935                         tot_out = sndlen;
12936                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12937                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12938                                 /* To big */
12939                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12940                                 error = EMSGSIZE;
12941                                 goto out;
12942                         }
12943                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12944                 }
12945                 if (mm == NULL) {
12946                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12947                         error = ENOMEM;
12948                         goto out;
12949                 }
12950                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12951                 max_out -= sizeof(struct sctp_abort_msg);
12952                 if (tot_out > max_out) {
12953                         tot_out = max_out;
12954                 }
12955                 if (mm) {
12956                         struct sctp_paramhdr *ph;
12957
12958                         /* now move forward the data pointer */
12959                         ph = mtod(mm, struct sctp_paramhdr *);
12960                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12961                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12962                         ph++;
12963                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12964                         if (top == NULL) {
12965                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12966                                 if (error) {
12967                                         /*-
12968                                          * Here if we can't get his data we
12969                                          * still abort we just don't get to
12970                                          * send the users note :-0
12971                                          */
12972                                         sctp_m_freem(mm);
12973                                         mm = NULL;
12974                                 }
12975                         } else {
12976                                 if (sndlen != 0) {
12977                                         SCTP_BUF_NEXT(mm) = top;
12978                                 }
12979                         }
12980                 }
12981                 if (hold_tcblock == 0) {
12982                         SCTP_TCB_LOCK(stcb);
12983                         hold_tcblock = 1;
12984                 }
12985                 atomic_add_int(&stcb->asoc.refcnt, -1);
12986                 free_cnt_applied = 0;
12987                 /* release this lock, otherwise we hang on ourselves */
12988                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12989                     SCTP_RESPONSE_TO_USER_REQ,
12990                     mm, SCTP_SO_LOCKED);
12991                 /* now relock the stcb so everything is sane */
12992                 hold_tcblock = 0;
12993                 stcb = NULL;
12994                 /*
12995                  * In this case top is already chained to mm avoid double
12996                  * free, since we free it below if top != NULL and driver
12997                  * would free it after sending the packet out
12998                  */
12999                 if (sndlen != 0) {
13000                         top = NULL;
13001                 }
13002                 goto out_unlocked;
13003         }
13004         /* Calculate the maximum we can send */
13005         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13006         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13007                 if (non_blocking) {
13008                         /* we already checked for non-blocking above. */
13009                         max_len = sndlen;
13010                 } else {
13011                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13012                 }
13013         } else {
13014                 max_len = 0;
13015         }
13016         if (hold_tcblock) {
13017                 SCTP_TCB_UNLOCK(stcb);
13018                 hold_tcblock = 0;
13019         }
13020         /* Is the stream no. valid? */
13021         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
13022                 /* Invalid stream number */
13023                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13024                 error = EINVAL;
13025                 goto out_unlocked;
13026         }
13027         if (asoc->strmout == NULL) {
13028                 /* huh? software error */
13029                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13030                 error = EFAULT;
13031                 goto out_unlocked;
13032         }
13033         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13034         if ((user_marks_eor == 0) &&
13035             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13036                 /* It will NEVER fit */
13037                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13038                 error = EMSGSIZE;
13039                 goto out_unlocked;
13040         }
13041         if ((uio == NULL) && user_marks_eor) {
13042                 /*-
13043                  * We do not support eeor mode for
13044                  * sending with mbuf chains (like sendfile).
13045                  */
13046                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13047                 error = EINVAL;
13048                 goto out_unlocked;
13049         }
13050         if (user_marks_eor) {
13051                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13052         } else {
13053                 /*-
13054                  * For non-eeor the whole message must fit in
13055                  * the socket send buffer.
13056                  */
13057                 local_add_more = sndlen;
13058         }
13059         len = 0;
13060         if (non_blocking) {
13061                 goto skip_preblock;
13062         }
13063         if (((max_len <= local_add_more) &&
13064             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13065             (max_len == 0) ||
13066             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13067                 /* No room right now ! */
13068                 SOCKBUF_LOCK(&so->so_snd);
13069                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13070                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13071                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13072                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13073                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13074                             inqueue_bytes,
13075                             local_add_more,
13076                             stcb->asoc.stream_queue_cnt,
13077                             stcb->asoc.chunks_on_out_queue,
13078                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13079                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13080                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
13081                         }
13082                         be.error = 0;
13083                         stcb->block_entry = &be;
13084                         error = sbwait(&so->so_snd);
13085                         stcb->block_entry = NULL;
13086                         if (error || so->so_error || be.error) {
13087                                 if (error == 0) {
13088                                         if (so->so_error)
13089                                                 error = so->so_error;
13090                                         if (be.error) {
13091                                                 error = be.error;
13092                                         }
13093                                 }
13094                                 SOCKBUF_UNLOCK(&so->so_snd);
13095                                 goto out_unlocked;
13096                         }
13097                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13098                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13099                                     so, asoc, stcb->asoc.total_output_queue_size);
13100                         }
13101                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13102                                 goto out_unlocked;
13103                         }
13104                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13105                 }
13106                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13107                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13108                 } else {
13109                         max_len = 0;
13110                 }
13111                 SOCKBUF_UNLOCK(&so->so_snd);
13112         }
13113 skip_preblock:
13114         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13115                 goto out_unlocked;
13116         }
13117         /*
13118          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13119          * case NOTE: uio will be null when top/mbuf is passed
13120          */
13121         if (sndlen == 0) {
13122                 if (srcv->sinfo_flags & SCTP_EOF) {
13123                         got_all_of_the_send = 1;
13124                         goto dataless_eof;
13125                 } else {
13126                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13127                         error = EINVAL;
13128                         goto out;
13129                 }
13130         }
13131         if (top == NULL) {
13132                 struct sctp_stream_queue_pending *sp;
13133                 struct sctp_stream_out *strm;
13134                 uint32_t sndout;
13135
13136                 SCTP_TCB_SEND_LOCK(stcb);
13137                 if ((asoc->stream_locked) &&
13138                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13139                         SCTP_TCB_SEND_UNLOCK(stcb);
13140                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13141                         error = EINVAL;
13142                         goto out;
13143                 }
13144                 SCTP_TCB_SEND_UNLOCK(stcb);
13145
13146                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13147                 if (strm->last_msg_incomplete == 0) {
13148         do_a_copy_in:
13149                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
13150                         if ((sp == NULL) || (error)) {
13151                                 goto out;
13152                         }
13153                         SCTP_TCB_SEND_LOCK(stcb);
13154                         if (sp->msg_is_complete) {
13155                                 strm->last_msg_incomplete = 0;
13156                                 asoc->stream_locked = 0;
13157                         } else {
13158                                 /*
13159                                  * Just got locked to this guy in case of an
13160                                  * interrupt.
13161                                  */
13162                                 strm->last_msg_incomplete = 1;
13163                                 asoc->stream_locked = 1;
13164                                 asoc->stream_locked_on = srcv->sinfo_stream;
13165                                 sp->sender_all_done = 0;
13166                         }
13167                         sctp_snd_sb_alloc(stcb, sp->length);
13168                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13169                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13170                                 sp->strseq = strm->next_sequence_sent;
13171                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13172                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13173                                             (uintptr_t) stcb, sp->length,
13174                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13175                                 }
13176                                 strm->next_sequence_sent++;
13177                         } else {
13178                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13179                         }
13180                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13181                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13182                         SCTP_TCB_SEND_UNLOCK(stcb);
13183                 } else {
13184                         SCTP_TCB_SEND_LOCK(stcb);
13185                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13186                         SCTP_TCB_SEND_UNLOCK(stcb);
13187                         if (sp == NULL) {
13188                                 /* ???? Huh ??? last msg is gone */
13189 #ifdef INVARIANTS
13190                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13191 #else
13192                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13193                                 strm->last_msg_incomplete = 0;
13194 #endif
13195                                 goto do_a_copy_in;
13196
13197                         }
13198                 }
13199                 while (uio->uio_resid > 0) {
13200                         /* How much room do we have? */
13201                         struct mbuf *new_tail, *mm;
13202
13203                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13204                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13205                         else
13206                                 max_len = 0;
13207
13208                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13209                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13210                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13211                                 sndout = 0;
13212                                 new_tail = NULL;
13213                                 if (hold_tcblock) {
13214                                         SCTP_TCB_UNLOCK(stcb);
13215                                         hold_tcblock = 0;
13216                                 }
13217                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
13218                                 if ((mm == NULL) || error) {
13219                                         if (mm) {
13220                                                 sctp_m_freem(mm);
13221                                         }
13222                                         goto out;
13223                                 }
13224                                 /* Update the mbuf and count */
13225                                 SCTP_TCB_SEND_LOCK(stcb);
13226                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13227                                         /*
13228                                          * we need to get out. Peer probably
13229                                          * aborted.
13230                                          */
13231                                         sctp_m_freem(mm);
13232                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13233                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13234                                                 error = ECONNRESET;
13235                                         }
13236                                         SCTP_TCB_SEND_UNLOCK(stcb);
13237                                         goto out;
13238                                 }
13239                                 if (sp->tail_mbuf) {
13240                                         /* tack it to the end */
13241                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13242                                         sp->tail_mbuf = new_tail;
13243                                 } else {
13244                                         /* A stolen mbuf */
13245                                         sp->data = mm;
13246                                         sp->tail_mbuf = new_tail;
13247                                 }
13248                                 sctp_snd_sb_alloc(stcb, sndout);
13249                                 atomic_add_int(&sp->length, sndout);
13250                                 len += sndout;
13251
13252                                 /* Did we reach EOR? */
13253                                 if ((uio->uio_resid == 0) &&
13254                                     ((user_marks_eor == 0) ||
13255                                     (srcv->sinfo_flags & SCTP_EOF) ||
13256                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13257                                         sp->msg_is_complete = 1;
13258                                 } else {
13259                                         sp->msg_is_complete = 0;
13260                                 }
13261                                 SCTP_TCB_SEND_UNLOCK(stcb);
13262                         }
13263                         if (uio->uio_resid == 0) {
13264                                 /* got it all? */
13265                                 continue;
13266                         }
13267                         /* PR-SCTP? */
13268                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13269                                 /*
13270                                  * This is ugly but we must assure locking
13271                                  * order
13272                                  */
13273                                 if (hold_tcblock == 0) {
13274                                         SCTP_TCB_LOCK(stcb);
13275                                         hold_tcblock = 1;
13276                                 }
13277                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13278                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13279                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13280                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13281                                 else
13282                                         max_len = 0;
13283                                 if (max_len > 0) {
13284                                         continue;
13285                                 }
13286                                 SCTP_TCB_UNLOCK(stcb);
13287                                 hold_tcblock = 0;
13288                         }
13289                         /* wait for space now */
13290                         if (non_blocking) {
13291                                 /* Non-blocking io in place out */
13292                                 goto skip_out_eof;
13293                         }
13294                         /* What about the INIT, send it maybe */
13295                         if (queue_only_for_init) {
13296                                 if (hold_tcblock == 0) {
13297                                         SCTP_TCB_LOCK(stcb);
13298                                         hold_tcblock = 1;
13299                                 }
13300                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13301                                         /* a collision took us forward? */
13302                                         queue_only = 0;
13303                                 } else {
13304                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13305                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13306                                         queue_only = 1;
13307                                 }
13308                         }
13309                         if ((net->flight_size > net->cwnd) &&
13310                             (asoc->sctp_cmt_on_off == 0)) {
13311                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13312                                 queue_only = 1;
13313                         } else if (asoc->ifp_had_enobuf) {
13314                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13315                                 if (net->flight_size > (2 * net->mtu)) {
13316                                         queue_only = 1;
13317                                 }
13318                                 asoc->ifp_had_enobuf = 0;
13319                         }
13320                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13321                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13322                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13323                             (stcb->asoc.total_flight > 0) &&
13324                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13325                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13326
13327                                 /*-
13328                                  * Ok, Nagle is set on and we have data outstanding.
13329                                  * Don't send anything and let SACKs drive out the
13330                                  * data unless wen have a "full" segment to send.
13331                                  */
13332                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13333                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13334                                 }
13335                                 SCTP_STAT_INCR(sctps_naglequeued);
13336                                 nagle_applies = 1;
13337                         } else {
13338                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13339                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13340                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13341                                 }
13342                                 SCTP_STAT_INCR(sctps_naglesent);
13343                                 nagle_applies = 0;
13344                         }
13345                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13346
13347                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13348                                     nagle_applies, un_sent);
13349                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13350                                     stcb->asoc.total_flight,
13351                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13352                         }
13353                         if (queue_only_for_init)
13354                                 queue_only_for_init = 0;
13355                         if ((queue_only == 0) && (nagle_applies == 0)) {
13356                                 /*-
13357                                  * need to start chunk output
13358                                  * before blocking.. note that if
13359                                  * a lock is already applied, then
13360                                  * the input via the net is happening
13361                                  * and I don't need to start output :-D
13362                                  */
13363                                 if (hold_tcblock == 0) {
13364                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13365                                                 hold_tcblock = 1;
13366                                                 sctp_chunk_output(inp,
13367                                                     stcb,
13368                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13369                                         }
13370                                 } else {
13371                                         sctp_chunk_output(inp,
13372                                             stcb,
13373                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13374                                 }
13375                                 if (hold_tcblock == 1) {
13376                                         SCTP_TCB_UNLOCK(stcb);
13377                                         hold_tcblock = 0;
13378                                 }
13379                         }
13380                         SOCKBUF_LOCK(&so->so_snd);
13381                         /*-
13382                          * This is a bit strange, but I think it will
13383                          * work. The total_output_queue_size is locked and
13384                          * protected by the TCB_LOCK, which we just released.
13385                          * There is a race that can occur between releasing it
13386                          * above, and me getting the socket lock, where sacks
13387                          * come in but we have not put the SB_WAIT on the
13388                          * so_snd buffer to get the wakeup. After the LOCK
13389                          * is applied the sack_processing will also need to
13390                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13391                          * once we have the socket buffer lock if we recheck the
13392                          * size we KNOW we will get to sleep safely with the
13393                          * wakeup flag in place.
13394                          */
13395                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13396                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13397                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13398                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13399                                             so, asoc, uio->uio_resid);
13400                                 }
13401                                 be.error = 0;
13402                                 stcb->block_entry = &be;
13403                                 error = sbwait(&so->so_snd);
13404                                 stcb->block_entry = NULL;
13405
13406                                 if (error || so->so_error || be.error) {
13407                                         if (error == 0) {
13408                                                 if (so->so_error)
13409                                                         error = so->so_error;
13410                                                 if (be.error) {
13411                                                         error = be.error;
13412                                                 }
13413                                         }
13414                                         SOCKBUF_UNLOCK(&so->so_snd);
13415                                         goto out_unlocked;
13416                                 }
13417                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13418                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13419                                             so, asoc, stcb->asoc.total_output_queue_size);
13420                                 }
13421                         }
13422                         SOCKBUF_UNLOCK(&so->so_snd);
13423                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13424                                 goto out_unlocked;
13425                         }
13426                 }
13427                 SCTP_TCB_SEND_LOCK(stcb);
13428                 if (sp) {
13429                         if (sp->msg_is_complete == 0) {
13430                                 strm->last_msg_incomplete = 1;
13431                                 asoc->stream_locked = 1;
13432                                 asoc->stream_locked_on = srcv->sinfo_stream;
13433                         } else {
13434                                 sp->sender_all_done = 1;
13435                                 strm->last_msg_incomplete = 0;
13436                                 asoc->stream_locked = 0;
13437                         }
13438                 } else {
13439                         SCTP_PRINTF("Huh no sp TSNH?\n");
13440                         strm->last_msg_incomplete = 0;
13441                         asoc->stream_locked = 0;
13442                 }
13443                 SCTP_TCB_SEND_UNLOCK(stcb);
13444                 if (uio->uio_resid == 0) {
13445                         got_all_of_the_send = 1;
13446                 }
13447         } else {
13448                 /* We send in a 0, since we do NOT have any locks */
13449                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13450                 top = NULL;
13451                 if (srcv->sinfo_flags & SCTP_EOF) {
13452                         /*
13453                          * This should only happen for Panda for the mbuf
13454                          * send case, which does NOT yet support EEOR mode.
13455                          * Thus, we can just set this flag to do the proper
13456                          * EOF handling.
13457                          */
13458                         got_all_of_the_send = 1;
13459                 }
13460         }
13461         if (error) {
13462                 goto out;
13463         }
13464 dataless_eof:
13465         /* EOF thing ? */
13466         if ((srcv->sinfo_flags & SCTP_EOF) &&
13467             (got_all_of_the_send == 1) &&
13468             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13469                 int cnt;
13470
13471                 SCTP_STAT_INCR(sctps_sends_with_eof);
13472                 error = 0;
13473                 if (hold_tcblock == 0) {
13474                         SCTP_TCB_LOCK(stcb);
13475                         hold_tcblock = 1;
13476                 }
13477                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13478                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13479                     TAILQ_EMPTY(&asoc->sent_queue) &&
13480                     (cnt == 0)) {
13481                         if (asoc->locked_on_sending) {
13482                                 goto abort_anyway;
13483                         }
13484                         /* there is nothing queued to send, so I'm done... */
13485                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13486                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13487                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13488                                 struct sctp_nets *netp;
13489
13490                                 if (stcb->asoc.alternate) {
13491                                         netp = stcb->asoc.alternate;
13492                                 } else {
13493                                         netp = stcb->asoc.primary_destination;
13494                                 }
13495                                 /* only send SHUTDOWN the first time through */
13496                                 sctp_send_shutdown(stcb, netp);
13497                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13498                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13499                                 }
13500                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13501                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13502                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13503                                     netp);
13504                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13505                                     asoc->primary_destination);
13506                         }
13507                 } else {
13508                         /*-
13509                          * we still got (or just got) data to send, so set
13510                          * SHUTDOWN_PENDING
13511                          */
13512                         /*-
13513                          * XXX sockets draft says that SCTP_EOF should be
13514                          * sent with no data.  currently, we will allow user
13515                          * data to be sent first and move to
13516                          * SHUTDOWN-PENDING
13517                          */
13518                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13519                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13520                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13521                                 if (hold_tcblock == 0) {
13522                                         SCTP_TCB_LOCK(stcb);
13523                                         hold_tcblock = 1;
13524                                 }
13525                                 if (asoc->locked_on_sending) {
13526                                         /* Locked to send out the data */
13527                                         struct sctp_stream_queue_pending *sp;
13528
13529                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13530                                         if (sp) {
13531                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13532                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13533                                         }
13534                                 }
13535                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13536                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13537                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13538                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13539                         abort_anyway:
13540                                         if (free_cnt_applied) {
13541                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13542                                                 free_cnt_applied = 0;
13543                                         }
13544                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13545                                             SCTP_RESPONSE_TO_USER_REQ,
13546                                             NULL, SCTP_SO_LOCKED);
13547                                         /*
13548                                          * now relock the stcb so everything
13549                                          * is sane
13550                                          */
13551                                         hold_tcblock = 0;
13552                                         stcb = NULL;
13553                                         goto out;
13554                                 }
13555                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13556                                     asoc->primary_destination);
13557                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13558                         }
13559                 }
13560         }
13561 skip_out_eof:
13562         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13563                 some_on_control = 1;
13564         }
13565         if (queue_only_for_init) {
13566                 if (hold_tcblock == 0) {
13567                         SCTP_TCB_LOCK(stcb);
13568                         hold_tcblock = 1;
13569                 }
13570                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13571                         /* a collision took us forward? */
13572                         queue_only = 0;
13573                 } else {
13574                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13575                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13576                         queue_only = 1;
13577                 }
13578         }
13579         if ((net->flight_size > net->cwnd) &&
13580             (stcb->asoc.sctp_cmt_on_off == 0)) {
13581                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13582                 queue_only = 1;
13583         } else if (asoc->ifp_had_enobuf) {
13584                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13585                 if (net->flight_size > (2 * net->mtu)) {
13586                         queue_only = 1;
13587                 }
13588                 asoc->ifp_had_enobuf = 0;
13589         }
13590         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13591             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13592         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13593             (stcb->asoc.total_flight > 0) &&
13594             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13595             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13596                 /*-
13597                  * Ok, Nagle is set on and we have data outstanding.
13598                  * Don't send anything and let SACKs drive out the
13599                  * data unless wen have a "full" segment to send.
13600                  */
13601                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13602                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13603                 }
13604                 SCTP_STAT_INCR(sctps_naglequeued);
13605                 nagle_applies = 1;
13606         } else {
13607                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13608                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13609                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13610                 }
13611                 SCTP_STAT_INCR(sctps_naglesent);
13612                 nagle_applies = 0;
13613         }
13614         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13615                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13616                     nagle_applies, un_sent);
13617                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13618                     stcb->asoc.total_flight,
13619                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13620         }
13621         if (queue_only_for_init)
13622                 queue_only_for_init = 0;
13623         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13624                 /* we can attempt to send too. */
13625                 if (hold_tcblock == 0) {
13626                         /*
13627                          * If there is activity recv'ing sacks no need to
13628                          * send
13629                          */
13630                         if (SCTP_TCB_TRYLOCK(stcb)) {
13631                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13632                                 hold_tcblock = 1;
13633                         }
13634                 } else {
13635                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13636                 }
13637         } else if ((queue_only == 0) &&
13638                     (stcb->asoc.peers_rwnd == 0) &&
13639             (stcb->asoc.total_flight == 0)) {
13640                 /* We get to have a probe outstanding */
13641                 if (hold_tcblock == 0) {
13642                         hold_tcblock = 1;
13643                         SCTP_TCB_LOCK(stcb);
13644                 }
13645                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13646         } else if (some_on_control) {
13647                 int num_out, reason, frag_point;
13648
13649                 /* Here we do control only */
13650                 if (hold_tcblock == 0) {
13651                         hold_tcblock = 1;
13652                         SCTP_TCB_LOCK(stcb);
13653                 }
13654                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13655                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13656                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13657         }
13658         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13659             queue_only, stcb->asoc.peers_rwnd, un_sent,
13660             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13661             stcb->asoc.total_output_queue_size, error);
13662
13663 out:
13664 out_unlocked:
13665
13666         if (local_soresv && stcb) {
13667                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13668                 local_soresv = 0;
13669         }
13670         if (create_lock_applied) {
13671                 SCTP_ASOC_CREATE_UNLOCK(inp);
13672                 create_lock_applied = 0;
13673         }
13674         if ((stcb) && hold_tcblock) {
13675                 SCTP_TCB_UNLOCK(stcb);
13676         }
13677         if (stcb && free_cnt_applied) {
13678                 atomic_add_int(&stcb->asoc.refcnt, -1);
13679         }
13680 #ifdef INVARIANTS
13681         if (stcb) {
13682                 if (mtx_owned(&stcb->tcb_mtx)) {
13683                         panic("Leaving with tcb mtx owned?");
13684                 }
13685                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13686                         panic("Leaving with tcb send mtx owned?");
13687                 }
13688         }
13689 #endif
13690 #ifdef INVARIANTS
13691         if (inp) {
13692                 sctp_validate_no_locks(inp);
13693         } else {
13694                 printf("Warning - inp is NULL so cant validate locks\n");
13695         }
13696 #endif
13697         if (top) {
13698                 sctp_m_freem(top);
13699         }
13700         if (control) {
13701                 sctp_m_freem(control);
13702         }
13703         return (error);
13704 }
13705
13706
13707 /*
13708  * generate an AUTHentication chunk, if required
13709  */
13710 struct mbuf *
13711 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13712     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13713     struct sctp_tcb *stcb, uint8_t chunk)
13714 {
13715         struct mbuf *m_auth;
13716         struct sctp_auth_chunk *auth;
13717         int chunk_len;
13718
13719         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13720             (stcb == NULL))
13721                 return (m);
13722
13723         /* sysctl disabled auth? */
13724         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13725                 return (m);
13726
13727         /* peer doesn't do auth... */
13728         if (!stcb->asoc.peer_supports_auth) {
13729                 return (m);
13730         }
13731         /* does the requested chunk require auth? */
13732         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13733                 return (m);
13734         }
13735         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13736         if (m_auth == NULL) {
13737                 /* no mbuf's */
13738                 return (m);
13739         }
13740         /* reserve some space if this will be the first mbuf */
13741         if (m == NULL)
13742                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13743         /* fill in the AUTH chunk details */
13744         auth = mtod(m_auth, struct sctp_auth_chunk *);
13745         bzero(auth, sizeof(*auth));
13746         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13747         auth->ch.chunk_flags = 0;
13748         chunk_len = sizeof(*auth) +
13749             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13750         auth->ch.chunk_length = htons(chunk_len);
13751         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13752         /* key id and hmac digest will be computed and filled in upon send */
13753
13754         /* save the offset where the auth was inserted into the chain */
13755         if (m != NULL) {
13756                 struct mbuf *cn;
13757
13758                 *offset = 0;
13759                 cn = m;
13760                 while (cn) {
13761                         *offset += SCTP_BUF_LEN(cn);
13762                         cn = SCTP_BUF_NEXT(cn);
13763                 }
13764         } else
13765                 *offset = 0;
13766
13767         /* update length and return pointer to the auth chunk */
13768         SCTP_BUF_LEN(m_auth) = chunk_len;
13769         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13770         if (auth_ret != NULL)
13771                 *auth_ret = auth;
13772
13773         return (m);
13774 }
13775
13776 #ifdef INET6
13777 int
13778 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13779 {
13780         struct nd_prefix *pfx = NULL;
13781         struct nd_pfxrouter *pfxrtr = NULL;
13782         struct sockaddr_in6 gw6;
13783
13784         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13785                 return (0);
13786
13787         /* get prefix entry of address */
13788         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13789                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13790                         continue;
13791                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13792                     &src6->sin6_addr, &pfx->ndpr_mask))
13793                         break;
13794         }
13795         /* no prefix entry in the prefix list */
13796         if (pfx == NULL) {
13797                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13798                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13799                 return (0);
13800         }
13801         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13802         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13803
13804         /* search installed gateway from prefix entry */
13805         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13806             pfxrtr->pfr_next) {
13807                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13808                 gw6.sin6_family = AF_INET6;
13809                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13810                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13811                     sizeof(struct in6_addr));
13812                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13813                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13814                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13815                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13816                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13817                     ro->ro_rt->rt_gateway)) {
13818                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13819                         return (1);
13820                 }
13821         }
13822         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13823         return (0);
13824 }
13825
13826 #endif
13827
13828 int
13829 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13830 {
13831 #ifdef INET
13832         struct sockaddr_in *sin, *mask;
13833         struct ifaddr *ifa;
13834         struct in_addr srcnetaddr, gwnetaddr;
13835
13836         if (ro == NULL || ro->ro_rt == NULL ||
13837             sifa->address.sa.sa_family != AF_INET) {
13838                 return (0);
13839         }
13840         ifa = (struct ifaddr *)sifa->ifa;
13841         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13842         sin = (struct sockaddr_in *)&sifa->address.sin;
13843         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13844         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13845         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13846         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13847
13848         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13849         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13850         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13851         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13852         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13853         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13854                 return (1);
13855         }
13856 #endif
13857         return (0);
13858 }