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 != net) {
8007                                 /*
8008                                  * No, not sent to the network we are
8009                                  * looking at
8010                                  */
8011                                 break;
8012                         }
8013                         if (chk->data == NULL) {
8014                                 break;
8015                         }
8016                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8017                             chk->sent != SCTP_DATAGRAM_RESEND) {
8018                                 break;
8019                         }
8020                         /*
8021                          * if no AUTH is yet included and this chunk
8022                          * requires it, make sure to account for it.  We
8023                          * don't apply the size until the AUTH chunk is
8024                          * actually added below in case there is no room for
8025                          * this chunk. NOTE: we overload the use of "omtu"
8026                          * here
8027                          */
8028                         if ((auth == NULL) &&
8029                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8030                             stcb->asoc.peer_auth_chunks)) {
8031                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8032                         } else
8033                                 omtu = 0;
8034                         /* Here we do NOT factor the r_mtu */
8035                         if ((chk->send_size < (int)(mtu - omtu)) ||
8036                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8037                                 /*
8038                                  * We probably should glom the mbuf chain
8039                                  * from the chk->data for control but the
8040                                  * problem is it becomes yet one more level
8041                                  * of tracking to do if for some reason
8042                                  * output fails. Then I have got to
8043                                  * reconstruct the merged control chain.. el
8044                                  * yucko.. for now we take the easy way and
8045                                  * do the copy
8046                                  */
8047                                 /*
8048                                  * Add an AUTH chunk, if chunk requires it
8049                                  * save the offset into the chain for AUTH
8050                                  */
8051                                 if ((auth == NULL) &&
8052                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8053                                     stcb->asoc.peer_auth_chunks))) {
8054                                         outchain = sctp_add_auth_chunk(outchain,
8055                                             &endoutchain,
8056                                             &auth,
8057                                             &auth_offset,
8058                                             stcb,
8059                                             chk->rec.chunk_id.id);
8060                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8061                                 }
8062                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8063                                     (int)chk->rec.chunk_id.can_take_data,
8064                                     chk->send_size, chk->copy_by_ref);
8065                                 if (outchain == NULL) {
8066                                         *reason_code = 8;
8067                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8068                                         return (ENOMEM);
8069                                 }
8070                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8071                                 /* update our MTU size */
8072                                 if (mtu > (chk->send_size + omtu))
8073                                         mtu -= (chk->send_size + omtu);
8074                                 else
8075                                         mtu = 0;
8076                                 to_out += (chk->send_size + omtu);
8077                                 /* Do clear IP_DF ? */
8078                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8079                                         no_fragmentflg = 0;
8080                                 }
8081                                 if (chk->rec.chunk_id.can_take_data)
8082                                         chk->data = NULL;
8083                                 /*
8084                                  * set hb flag since we can use these for
8085                                  * RTO
8086                                  */
8087                                 hbflag = 1;
8088                                 asconf = 1;
8089                                 /*
8090                                  * should sysctl this: don't bundle data
8091                                  * with ASCONF since it requires AUTH
8092                                  */
8093                                 no_data_chunks = 1;
8094                                 chk->sent = SCTP_DATAGRAM_SENT;
8095                                 chk->snd_count++;
8096                                 if (mtu == 0) {
8097                                         /*
8098                                          * Ok we are out of room but we can
8099                                          * output without effecting the
8100                                          * flight size since this little guy
8101                                          * is a control only packet.
8102                                          */
8103                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8104                                         /*
8105                                          * do NOT clear the asconf flag as
8106                                          * it is used to do appropriate
8107                                          * source address selection.
8108                                          */
8109                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8110                                             (struct sockaddr *)&net->ro._l_addr,
8111                                             outchain, auth_offset, auth,
8112                                             stcb->asoc.authinfo.active_keyid,
8113                                             no_fragmentflg, 0, NULL, asconf,
8114                                             inp->sctp_lport, stcb->rport,
8115                                             htonl(stcb->asoc.peer_vtag),
8116                                             net->port, so_locked, NULL, NULL))) {
8117                                                 if (error == ENOBUFS) {
8118                                                         asoc->ifp_had_enobuf = 1;
8119                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8120                                                 }
8121                                                 if (from_where == 0) {
8122                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8123                                                 }
8124                                                 if (*now_filled == 0) {
8125                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8126                                                         *now_filled = 1;
8127                                                         *now = net->last_sent_time;
8128                                                 } else {
8129                                                         net->last_sent_time = *now;
8130                                                 }
8131                                                 hbflag = 0;
8132                                                 /* error, could not output */
8133                                                 if (error == EHOSTUNREACH) {
8134                                                         /*
8135                                                          * Destination went
8136                                                          * unreachable
8137                                                          * during this send
8138                                                          */
8139                                                         sctp_move_chunks_from_net(stcb, net);
8140                                                 }
8141                                                 *reason_code = 7;
8142                                                 continue;
8143                                         } else
8144                                                 asoc->ifp_had_enobuf = 0;
8145                                         if (*now_filled == 0) {
8146                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8147                                                 *now_filled = 1;
8148                                                 *now = net->last_sent_time;
8149                                         } else {
8150                                                 net->last_sent_time = *now;
8151                                         }
8152                                         hbflag = 0;
8153                                         /*
8154                                          * increase the number we sent, if a
8155                                          * cookie is sent we don't tell them
8156                                          * any was sent out.
8157                                          */
8158                                         outchain = endoutchain = NULL;
8159                                         auth = NULL;
8160                                         auth_offset = 0;
8161                                         if (!no_out_cnt)
8162                                                 *num_out += ctl_cnt;
8163                                         /* recalc a clean slate and setup */
8164                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8165                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8166                                         } else {
8167                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8168                                         }
8169                                         to_out = 0;
8170                                         no_fragmentflg = 1;
8171                                 }
8172                         }
8173                 }
8174                 /************************/
8175                 /* Control transmission */
8176                 /************************/
8177                 /* Now first lets go through the control queue */
8178                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8179                         if ((sack_goes_to) &&
8180                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8181                             (chk->whoTo != sack_goes_to)) {
8182                                 /*
8183                                  * if we have a sack in queue, and we are
8184                                  * looking at an ecn echo that is NOT queued
8185                                  * to where the sack is going..
8186                                  */
8187                                 if (chk->whoTo == net) {
8188                                         /*
8189                                          * Don't transmit it to where its
8190                                          * going (current net)
8191                                          */
8192                                         continue;
8193                                 } else if (sack_goes_to == net) {
8194                                         /*
8195                                          * But do transmit it to this
8196                                          * address
8197                                          */
8198                                         goto skip_net_check;
8199                                 }
8200                         }
8201                         if (chk->whoTo != net) {
8202                                 /*
8203                                  * No, not sent to the network we are
8204                                  * looking at
8205                                  */
8206                                 continue;
8207                         }
8208         skip_net_check:
8209                         if (chk->data == NULL) {
8210                                 continue;
8211                         }
8212                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8213                                 /*
8214                                  * It must be unsent. Cookies and ASCONF's
8215                                  * hang around but there timers will force
8216                                  * when marked for resend.
8217                                  */
8218                                 continue;
8219                         }
8220                         /*
8221                          * if no AUTH is yet included and this chunk
8222                          * requires it, make sure to account for it.  We
8223                          * don't apply the size until the AUTH chunk is
8224                          * actually added below in case there is no room for
8225                          * this chunk. NOTE: we overload the use of "omtu"
8226                          * here
8227                          */
8228                         if ((auth == NULL) &&
8229                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8230                             stcb->asoc.peer_auth_chunks)) {
8231                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8232                         } else
8233                                 omtu = 0;
8234                         /* Here we do NOT factor the r_mtu */
8235                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8236                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8237                                 /*
8238                                  * We probably should glom the mbuf chain
8239                                  * from the chk->data for control but the
8240                                  * problem is it becomes yet one more level
8241                                  * of tracking to do if for some reason
8242                                  * output fails. Then I have got to
8243                                  * reconstruct the merged control chain.. el
8244                                  * yucko.. for now we take the easy way and
8245                                  * do the copy
8246                                  */
8247                                 /*
8248                                  * Add an AUTH chunk, if chunk requires it
8249                                  * save the offset into the chain for AUTH
8250                                  */
8251                                 if ((auth == NULL) &&
8252                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8253                                     stcb->asoc.peer_auth_chunks))) {
8254                                         outchain = sctp_add_auth_chunk(outchain,
8255                                             &endoutchain,
8256                                             &auth,
8257                                             &auth_offset,
8258                                             stcb,
8259                                             chk->rec.chunk_id.id);
8260                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8261                                 }
8262                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8263                                     (int)chk->rec.chunk_id.can_take_data,
8264                                     chk->send_size, chk->copy_by_ref);
8265                                 if (outchain == NULL) {
8266                                         *reason_code = 8;
8267                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8268                                         return (ENOMEM);
8269                                 }
8270                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8271                                 /* update our MTU size */
8272                                 if (mtu > (chk->send_size + omtu))
8273                                         mtu -= (chk->send_size + omtu);
8274                                 else
8275                                         mtu = 0;
8276                                 to_out += (chk->send_size + omtu);
8277                                 /* Do clear IP_DF ? */
8278                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8279                                         no_fragmentflg = 0;
8280                                 }
8281                                 if (chk->rec.chunk_id.can_take_data)
8282                                         chk->data = NULL;
8283                                 /* Mark things to be removed, if needed */
8284                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8285                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8286                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8287                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8288                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8289                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8290                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8291                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8292                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8293                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8294                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8295                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8296                                                 hbflag = 1;
8297                                         }
8298                                         /* remove these chunks at the end */
8299                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8300                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8301                                                 /* turn off the timer */
8302                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8303                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8304                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8305                                                 }
8306                                         }
8307                                         ctl_cnt++;
8308                                 } else {
8309                                         /*
8310                                          * Other chunks, since they have
8311                                          * timers running (i.e. COOKIE) we
8312                                          * just "trust" that it gets sent or
8313                                          * retransmitted.
8314                                          */
8315                                         ctl_cnt++;
8316                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8317                                                 cookie = 1;
8318                                                 no_out_cnt = 1;
8319                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8320                                                 /*
8321                                                  * Increment ecne send count
8322                                                  * here this means we may be
8323                                                  * over-zealous in our
8324                                                  * counting if the send
8325                                                  * fails, but its the best
8326                                                  * place to do it (we used
8327                                                  * to do it in the queue of
8328                                                  * the chunk, but that did
8329                                                  * not tell how many times
8330                                                  * it was sent.
8331                                                  */
8332                                                 SCTP_STAT_INCR(sctps_sendecne);
8333                                         }
8334                                         chk->sent = SCTP_DATAGRAM_SENT;
8335                                         chk->snd_count++;
8336                                 }
8337                                 if (mtu == 0) {
8338                                         /*
8339                                          * Ok we are out of room but we can
8340                                          * output without effecting the
8341                                          * flight size since this little guy
8342                                          * is a control only packet.
8343                                          */
8344                                         if (asconf) {
8345                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8346                                                 /*
8347                                                  * do NOT clear the asconf
8348                                                  * flag as it is used to do
8349                                                  * appropriate source
8350                                                  * address selection.
8351                                                  */
8352                                         }
8353                                         if (cookie) {
8354                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8355                                                 cookie = 0;
8356                                         }
8357                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8358                                             (struct sockaddr *)&net->ro._l_addr,
8359                                             outchain,
8360                                             auth_offset, auth,
8361                                             stcb->asoc.authinfo.active_keyid,
8362                                             no_fragmentflg, 0, NULL, asconf,
8363                                             inp->sctp_lport, stcb->rport,
8364                                             htonl(stcb->asoc.peer_vtag),
8365                                             net->port, so_locked, NULL, NULL))) {
8366                                                 if (error == ENOBUFS) {
8367                                                         asoc->ifp_had_enobuf = 1;
8368                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8369                                                 }
8370                                                 if (from_where == 0) {
8371                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8372                                                 }
8373                                                 /* error, could not output */
8374                                                 if (hbflag) {
8375                                                         if (*now_filled == 0) {
8376                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8377                                                                 *now_filled = 1;
8378                                                                 *now = net->last_sent_time;
8379                                                         } else {
8380                                                                 net->last_sent_time = *now;
8381                                                         }
8382                                                         hbflag = 0;
8383                                                 }
8384                                                 if (error == EHOSTUNREACH) {
8385                                                         /*
8386                                                          * Destination went
8387                                                          * unreachable
8388                                                          * during this send
8389                                                          */
8390                                                         sctp_move_chunks_from_net(stcb, net);
8391                                                 }
8392                                                 *reason_code = 7;
8393                                                 continue;
8394                                         } else
8395                                                 asoc->ifp_had_enobuf = 0;
8396                                         /* Only HB or ASCONF advances time */
8397                                         if (hbflag) {
8398                                                 if (*now_filled == 0) {
8399                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8400                                                         *now_filled = 1;
8401                                                         *now = net->last_sent_time;
8402                                                 } else {
8403                                                         net->last_sent_time = *now;
8404                                                 }
8405                                                 hbflag = 0;
8406                                         }
8407                                         /*
8408                                          * increase the number we sent, if a
8409                                          * cookie is sent we don't tell them
8410                                          * any was sent out.
8411                                          */
8412                                         outchain = endoutchain = NULL;
8413                                         auth = NULL;
8414                                         auth_offset = 0;
8415                                         if (!no_out_cnt)
8416                                                 *num_out += ctl_cnt;
8417                                         /* recalc a clean slate and setup */
8418                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
8419                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
8420                                         } else {
8421                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
8422                                         }
8423                                         to_out = 0;
8424                                         no_fragmentflg = 1;
8425                                 }
8426                         }
8427                 }
8428                 /* JRI: if dest is in PF state, do not send data to it */
8429                 if ((asoc->sctp_cmt_on_off > 0) &&
8430                     (net != stcb->asoc.alternate) &&
8431                     (net->dest_state & SCTP_ADDR_PF)) {
8432                         goto no_data_fill;
8433                 }
8434                 if (net->flight_size >= net->cwnd) {
8435                         goto no_data_fill;
8436                 }
8437                 if ((asoc->sctp_cmt_on_off > 0) &&
8438                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8439                     (net->flight_size > max_rwnd_per_dest)) {
8440                         goto no_data_fill;
8441                 }
8442                 /*
8443                  * We need a specific accounting for the usage of the send
8444                  * buffer. We also need to check the number of messages per
8445                  * net. For now, this is better than nothing and it disabled
8446                  * by default...
8447                  */
8448                 if ((asoc->sctp_cmt_on_off > 0) &&
8449                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8450                     (max_send_per_dest > 0) &&
8451                     (net->flight_size > max_send_per_dest)) {
8452                         goto no_data_fill;
8453                 }
8454                 /*********************/
8455                 /* Data transmission */
8456                 /*********************/
8457                 /*
8458                  * if AUTH for DATA is required and no AUTH has been added
8459                  * yet, account for this in the mtu now... if no data can be
8460                  * bundled, this adjustment won't matter anyways since the
8461                  * packet will be going out...
8462                  */
8463                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8464                     stcb->asoc.peer_auth_chunks);
8465                 if (data_auth_reqd && (auth == NULL)) {
8466                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8467                 }
8468                 /* now lets add any data within the MTU constraints */
8469                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8470                 case AF_INET:
8471                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8472                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8473                         else
8474                                 omtu = 0;
8475                         break;
8476 #ifdef INET6
8477                 case AF_INET6:
8478                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8479                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8480                         else
8481                                 omtu = 0;
8482                         break;
8483 #endif
8484                 default:
8485                         /* TSNH */
8486                         omtu = 0;
8487                         break;
8488                 }
8489                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8490                     (skip_data_for_this_net == 0)) ||
8491                     (cookie)) {
8492                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8493                                 if (no_data_chunks) {
8494                                         /* let only control go out */
8495                                         *reason_code = 1;
8496                                         break;
8497                                 }
8498                                 if (net->flight_size >= net->cwnd) {
8499                                         /* skip this net, no room for data */
8500                                         *reason_code = 2;
8501                                         break;
8502                                 }
8503                                 if ((chk->whoTo != NULL) &&
8504                                     (chk->whoTo != net)) {
8505                                         /* Don't send the chunk on this net */
8506                                         continue;
8507                                 }
8508                                 if (asoc->sctp_cmt_on_off == 0) {
8509                                         if ((asoc->alternate) &&
8510                                             (asoc->alternate != net) &&
8511                                             (chk->whoTo == NULL)) {
8512                                                 continue;
8513                                         } else if ((net != asoc->primary_destination) &&
8514                                                     (asoc->alternate == NULL) &&
8515                                             (chk->whoTo == NULL)) {
8516                                                 continue;
8517                                         }
8518                                 }
8519                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8520                                         /*-
8521                                          * strange, we have a chunk that is
8522                                          * to big for its destination and
8523                                          * yet no fragment ok flag.
8524                                          * Something went wrong when the
8525                                          * PMTU changed...we did not mark
8526                                          * this chunk for some reason?? I
8527                                          * will fix it here by letting IP
8528                                          * fragment it for now and printing
8529                                          * a warning. This really should not
8530                                          * happen ...
8531                                          */
8532                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8533                                             chk->send_size, mtu);
8534                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8535                                 }
8536                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8537                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8538                                         struct sctp_data_chunk *dchkh;
8539
8540                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8541                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8542                                 }
8543                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8544                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8545                                         /* ok we will add this one */
8546
8547                                         /*
8548                                          * Add an AUTH chunk, if chunk
8549                                          * requires it, save the offset into
8550                                          * the chain for AUTH
8551                                          */
8552                                         if (data_auth_reqd) {
8553                                                 if (auth == NULL) {
8554                                                         outchain = sctp_add_auth_chunk(outchain,
8555                                                             &endoutchain,
8556                                                             &auth,
8557                                                             &auth_offset,
8558                                                             stcb,
8559                                                             SCTP_DATA);
8560                                                         auth_keyid = chk->auth_keyid;
8561                                                         override_ok = 0;
8562                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8563                                                 } else if (override_ok) {
8564                                                         /*
8565                                                          * use this data's
8566                                                          * keyid
8567                                                          */
8568                                                         auth_keyid = chk->auth_keyid;
8569                                                         override_ok = 0;
8570                                                 } else if (auth_keyid != chk->auth_keyid) {
8571                                                         /*
8572                                                          * different keyid,
8573                                                          * so done bundling
8574                                                          */
8575                                                         break;
8576                                                 }
8577                                         }
8578                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8579                                             chk->send_size, chk->copy_by_ref);
8580                                         if (outchain == NULL) {
8581                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8582                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8583                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8584                                                 }
8585                                                 *reason_code = 3;
8586                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8587                                                 return (ENOMEM);
8588                                         }
8589                                         /* upate our MTU size */
8590                                         /* Do clear IP_DF ? */
8591                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8592                                                 no_fragmentflg = 0;
8593                                         }
8594                                         /* unsigned subtraction of mtu */
8595                                         if (mtu > chk->send_size)
8596                                                 mtu -= chk->send_size;
8597                                         else
8598                                                 mtu = 0;
8599                                         /* unsigned subtraction of r_mtu */
8600                                         if (r_mtu > chk->send_size)
8601                                                 r_mtu -= chk->send_size;
8602                                         else
8603                                                 r_mtu = 0;
8604
8605                                         to_out += chk->send_size;
8606                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8607 #ifdef INVARIANTS
8608                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8609 #else
8610                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8611                                                     mx_mtu, to_out);
8612 #endif
8613                                         }
8614                                         chk->window_probe = 0;
8615                                         data_list[bundle_at++] = chk;
8616                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8617                                                 mtu = 0;
8618                                                 break;
8619                                         }
8620                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8621                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8622                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8623                                                 } else {
8624                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8625                                                 }
8626                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8627                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8628                                                         /*
8629                                                          * Count number of
8630                                                          * user msg's that
8631                                                          * were fragmented
8632                                                          * we do this by
8633                                                          * counting when we
8634                                                          * see a LAST
8635                                                          * fragment only.
8636                                                          */
8637                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8638                                         }
8639                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8640                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8641                                                         data_list[0]->window_probe = 1;
8642                                                         net->window_probe = 1;
8643                                                 }
8644                                                 break;
8645                                         }
8646                                 } else {
8647                                         /*
8648                                          * Must be sent in order of the
8649                                          * TSN's (on a network)
8650                                          */
8651                                         break;
8652                                 }
8653                         }       /* for (chunk gather loop for this net) */
8654                 }               /* if asoc.state OPEN */
8655 no_data_fill:
8656                 /* Is there something to send for this destination? */
8657                 if (outchain) {
8658                         /* We may need to start a control timer or two */
8659                         if (asconf) {
8660                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8661                                     stcb, net);
8662                                 /*
8663                                  * do NOT clear the asconf flag as it is
8664                                  * used to do appropriate source address
8665                                  * selection.
8666                                  */
8667                         }
8668                         if (cookie) {
8669                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8670                                 cookie = 0;
8671                         }
8672                         /* must start a send timer if data is being sent */
8673                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8674                                 /*
8675                                  * no timer running on this destination
8676                                  * restart it.
8677                                  */
8678                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8679                         }
8680                         /* Now send it, if there is anything to send :> */
8681                         if ((error = sctp_lowlevel_chunk_output(inp,
8682                             stcb,
8683                             net,
8684                             (struct sockaddr *)&net->ro._l_addr,
8685                             outchain,
8686                             auth_offset,
8687                             auth,
8688                             auth_keyid,
8689                             no_fragmentflg,
8690                             bundle_at,
8691                             data_list[0],
8692                             asconf,
8693                             inp->sctp_lport, stcb->rport,
8694                             htonl(stcb->asoc.peer_vtag),
8695                             net->port, so_locked, NULL, NULL))) {
8696                                 /* error, we could not output */
8697                                 if (error == ENOBUFS) {
8698                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8699                                         asoc->ifp_had_enobuf = 1;
8700                                 }
8701                                 if (from_where == 0) {
8702                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8703                                 }
8704                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8705                                 if (hbflag) {
8706                                         if (*now_filled == 0) {
8707                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8708                                                 *now_filled = 1;
8709                                                 *now = net->last_sent_time;
8710                                         } else {
8711                                                 net->last_sent_time = *now;
8712                                         }
8713                                         hbflag = 0;
8714                                 }
8715                                 if (error == EHOSTUNREACH) {
8716                                         /*
8717                                          * Destination went unreachable
8718                                          * during this send
8719                                          */
8720                                         sctp_move_chunks_from_net(stcb, net);
8721                                 }
8722                                 *reason_code = 6;
8723                                 /*-
8724                                  * I add this line to be paranoid. As far as
8725                                  * I can tell the continue, takes us back to
8726                                  * the top of the for, but just to make sure
8727                                  * I will reset these again here.
8728                                  */
8729                                 ctl_cnt = bundle_at = 0;
8730                                 continue;       /* This takes us back to the
8731                                                  * for() for the nets. */
8732                         } else {
8733                                 asoc->ifp_had_enobuf = 0;
8734                         }
8735                         outchain = endoutchain = NULL;
8736                         auth = NULL;
8737                         auth_offset = 0;
8738                         if (bundle_at || hbflag) {
8739                                 /* For data/asconf and hb set time */
8740                                 if (*now_filled == 0) {
8741                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8742                                         *now_filled = 1;
8743                                         *now = net->last_sent_time;
8744                                 } else {
8745                                         net->last_sent_time = *now;
8746                                 }
8747                         }
8748                         if (!no_out_cnt) {
8749                                 *num_out += (ctl_cnt + bundle_at);
8750                         }
8751                         if (bundle_at) {
8752                                 /* setup for a RTO measurement */
8753                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8754                                 /* fill time if not already filled */
8755                                 if (*now_filled == 0) {
8756                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8757                                         *now_filled = 1;
8758                                         *now = asoc->time_last_sent;
8759                                 } else {
8760                                         asoc->time_last_sent = *now;
8761                                 }
8762                                 if (net->rto_needed) {
8763                                         data_list[0]->do_rtt = 1;
8764                                         net->rto_needed = 0;
8765                                 }
8766                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8767                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8768                         }
8769                         if (one_chunk) {
8770                                 break;
8771                         }
8772                 }
8773                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8774                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8775                 }
8776         }
8777         if (old_start_at == NULL) {
8778                 old_start_at = start_at;
8779                 start_at = TAILQ_FIRST(&asoc->nets);
8780                 if (old_start_at)
8781                         goto again_one_more_time;
8782         }
8783         /*
8784          * At the end there should be no NON timed chunks hanging on this
8785          * queue.
8786          */
8787         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8788                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8789         }
8790         if ((*num_out == 0) && (*reason_code == 0)) {
8791                 *reason_code = 4;
8792         } else {
8793                 *reason_code = 5;
8794         }
8795         sctp_clean_up_ctl(stcb, asoc, so_locked);
8796         return (0);
8797 }
8798
8799 void
8800 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8801 {
8802         /*-
8803          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8804          * the control chunk queue.
8805          */
8806         struct sctp_chunkhdr *hdr;
8807         struct sctp_tmit_chunk *chk;
8808         struct mbuf *mat;
8809
8810         SCTP_TCB_LOCK_ASSERT(stcb);
8811         sctp_alloc_a_chunk(stcb, chk);
8812         if (chk == NULL) {
8813                 /* no memory */
8814                 sctp_m_freem(op_err);
8815                 return;
8816         }
8817         chk->copy_by_ref = 0;
8818         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8819         if (op_err == NULL) {
8820                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8821                 return;
8822         }
8823         chk->send_size = 0;
8824         mat = op_err;
8825         while (mat != NULL) {
8826                 chk->send_size += SCTP_BUF_LEN(mat);
8827                 mat = SCTP_BUF_NEXT(mat);
8828         }
8829         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8830         chk->rec.chunk_id.can_take_data = 1;
8831         chk->sent = SCTP_DATAGRAM_UNSENT;
8832         chk->snd_count = 0;
8833         chk->flags = 0;
8834         chk->asoc = &stcb->asoc;
8835         chk->data = op_err;
8836         chk->whoTo = NULL;
8837         hdr = mtod(op_err, struct sctp_chunkhdr *);
8838         hdr->chunk_type = SCTP_OPERATION_ERROR;
8839         hdr->chunk_flags = 0;
8840         hdr->chunk_length = htons(chk->send_size);
8841         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8842             chk,
8843             sctp_next);
8844         chk->asoc->ctrl_queue_cnt++;
8845 }
8846
8847 int
8848 sctp_send_cookie_echo(struct mbuf *m,
8849     int offset,
8850     struct sctp_tcb *stcb,
8851     struct sctp_nets *net)
8852 {
8853         /*-
8854          * pull out the cookie and put it at the front of the control chunk
8855          * queue.
8856          */
8857         int at;
8858         struct mbuf *cookie;
8859         struct sctp_paramhdr parm, *phdr;
8860         struct sctp_chunkhdr *hdr;
8861         struct sctp_tmit_chunk *chk;
8862         uint16_t ptype, plen;
8863
8864         /* First find the cookie in the param area */
8865         cookie = NULL;
8866         at = offset + sizeof(struct sctp_init_chunk);
8867
8868         SCTP_TCB_LOCK_ASSERT(stcb);
8869         do {
8870                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8871                 if (phdr == NULL) {
8872                         return (-3);
8873                 }
8874                 ptype = ntohs(phdr->param_type);
8875                 plen = ntohs(phdr->param_length);
8876                 if (ptype == SCTP_STATE_COOKIE) {
8877                         int pad;
8878
8879                         /* found the cookie */
8880                         if ((pad = (plen % 4))) {
8881                                 plen += 4 - pad;
8882                         }
8883                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8884                         if (cookie == NULL) {
8885                                 /* No memory */
8886                                 return (-2);
8887                         }
8888 #ifdef SCTP_MBUF_LOGGING
8889                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8890                                 struct mbuf *mat;
8891
8892                                 mat = cookie;
8893                                 while (mat) {
8894                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8895                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8896                                         }
8897                                         mat = SCTP_BUF_NEXT(mat);
8898                                 }
8899                         }
8900 #endif
8901                         break;
8902                 }
8903                 at += SCTP_SIZE32(plen);
8904         } while (phdr);
8905         if (cookie == NULL) {
8906                 /* Did not find the cookie */
8907                 return (-3);
8908         }
8909         /* ok, we got the cookie lets change it into a cookie echo chunk */
8910
8911         /* first the change from param to cookie */
8912         hdr = mtod(cookie, struct sctp_chunkhdr *);
8913         hdr->chunk_type = SCTP_COOKIE_ECHO;
8914         hdr->chunk_flags = 0;
8915         /* get the chunk stuff now and place it in the FRONT of the queue */
8916         sctp_alloc_a_chunk(stcb, chk);
8917         if (chk == NULL) {
8918                 /* no memory */
8919                 sctp_m_freem(cookie);
8920                 return (-5);
8921         }
8922         chk->copy_by_ref = 0;
8923         chk->send_size = plen;
8924         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8925         chk->rec.chunk_id.can_take_data = 0;
8926         chk->sent = SCTP_DATAGRAM_UNSENT;
8927         chk->snd_count = 0;
8928         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8929         chk->asoc = &stcb->asoc;
8930         chk->data = cookie;
8931         chk->whoTo = net;
8932         atomic_add_int(&chk->whoTo->ref_count, 1);
8933         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8934         chk->asoc->ctrl_queue_cnt++;
8935         return (0);
8936 }
8937
8938 void
8939 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8940     struct mbuf *m,
8941     int offset,
8942     int chk_length,
8943     struct sctp_nets *net)
8944 {
8945         /*
8946          * take a HB request and make it into a HB ack and send it.
8947          */
8948         struct mbuf *outchain;
8949         struct sctp_chunkhdr *chdr;
8950         struct sctp_tmit_chunk *chk;
8951
8952
8953         if (net == NULL)
8954                 /* must have a net pointer */
8955                 return;
8956
8957         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8958         if (outchain == NULL) {
8959                 /* gak out of memory */
8960                 return;
8961         }
8962 #ifdef SCTP_MBUF_LOGGING
8963         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8964                 struct mbuf *mat;
8965
8966                 mat = outchain;
8967                 while (mat) {
8968                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8969                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8970                         }
8971                         mat = SCTP_BUF_NEXT(mat);
8972                 }
8973         }
8974 #endif
8975         chdr = mtod(outchain, struct sctp_chunkhdr *);
8976         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8977         chdr->chunk_flags = 0;
8978         if (chk_length % 4) {
8979                 /* need pad */
8980                 uint32_t cpthis = 0;
8981                 int padlen;
8982
8983                 padlen = 4 - (chk_length % 4);
8984                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8985         }
8986         sctp_alloc_a_chunk(stcb, chk);
8987         if (chk == NULL) {
8988                 /* no memory */
8989                 sctp_m_freem(outchain);
8990                 return;
8991         }
8992         chk->copy_by_ref = 0;
8993         chk->send_size = chk_length;
8994         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8995         chk->rec.chunk_id.can_take_data = 1;
8996         chk->sent = SCTP_DATAGRAM_UNSENT;
8997         chk->snd_count = 0;
8998         chk->flags = 0;
8999         chk->asoc = &stcb->asoc;
9000         chk->data = outchain;
9001         chk->whoTo = net;
9002         atomic_add_int(&chk->whoTo->ref_count, 1);
9003         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9004         chk->asoc->ctrl_queue_cnt++;
9005 }
9006
9007 void
9008 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9009 {
9010         /* formulate and queue a cookie-ack back to sender */
9011         struct mbuf *cookie_ack;
9012         struct sctp_chunkhdr *hdr;
9013         struct sctp_tmit_chunk *chk;
9014
9015         cookie_ack = NULL;
9016         SCTP_TCB_LOCK_ASSERT(stcb);
9017
9018         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9019         if (cookie_ack == NULL) {
9020                 /* no mbuf's */
9021                 return;
9022         }
9023         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9024         sctp_alloc_a_chunk(stcb, chk);
9025         if (chk == NULL) {
9026                 /* no memory */
9027                 sctp_m_freem(cookie_ack);
9028                 return;
9029         }
9030         chk->copy_by_ref = 0;
9031         chk->send_size = sizeof(struct sctp_chunkhdr);
9032         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9033         chk->rec.chunk_id.can_take_data = 1;
9034         chk->sent = SCTP_DATAGRAM_UNSENT;
9035         chk->snd_count = 0;
9036         chk->flags = 0;
9037         chk->asoc = &stcb->asoc;
9038         chk->data = cookie_ack;
9039         if (chk->asoc->last_control_chunk_from != NULL) {
9040                 chk->whoTo = chk->asoc->last_control_chunk_from;
9041                 atomic_add_int(&chk->whoTo->ref_count, 1);
9042         } else {
9043                 chk->whoTo = NULL;
9044         }
9045         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9046         hdr->chunk_type = SCTP_COOKIE_ACK;
9047         hdr->chunk_flags = 0;
9048         hdr->chunk_length = htons(chk->send_size);
9049         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9050         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9051         chk->asoc->ctrl_queue_cnt++;
9052         return;
9053 }
9054
9055
9056 void
9057 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9058 {
9059         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9060         struct mbuf *m_shutdown_ack;
9061         struct sctp_shutdown_ack_chunk *ack_cp;
9062         struct sctp_tmit_chunk *chk;
9063
9064         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9065         if (m_shutdown_ack == NULL) {
9066                 /* no mbuf's */
9067                 return;
9068         }
9069         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9070         sctp_alloc_a_chunk(stcb, chk);
9071         if (chk == NULL) {
9072                 /* no memory */
9073                 sctp_m_freem(m_shutdown_ack);
9074                 return;
9075         }
9076         chk->copy_by_ref = 0;
9077         chk->send_size = sizeof(struct sctp_chunkhdr);
9078         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9079         chk->rec.chunk_id.can_take_data = 1;
9080         chk->sent = SCTP_DATAGRAM_UNSENT;
9081         chk->snd_count = 0;
9082         chk->flags = 0;
9083         chk->asoc = &stcb->asoc;
9084         chk->data = m_shutdown_ack;
9085         chk->whoTo = net;
9086         if (chk->whoTo) {
9087                 atomic_add_int(&chk->whoTo->ref_count, 1);
9088         }
9089         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9090         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9091         ack_cp->ch.chunk_flags = 0;
9092         ack_cp->ch.chunk_length = htons(chk->send_size);
9093         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9094         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9095         chk->asoc->ctrl_queue_cnt++;
9096         return;
9097 }
9098
9099 void
9100 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9101 {
9102         /* formulate and queue a SHUTDOWN to the sender */
9103         struct mbuf *m_shutdown;
9104         struct sctp_shutdown_chunk *shutdown_cp;
9105         struct sctp_tmit_chunk *chk;
9106
9107         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9108         if (m_shutdown == NULL) {
9109                 /* no mbuf's */
9110                 return;
9111         }
9112         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9113         sctp_alloc_a_chunk(stcb, chk);
9114         if (chk == NULL) {
9115                 /* no memory */
9116                 sctp_m_freem(m_shutdown);
9117                 return;
9118         }
9119         chk->copy_by_ref = 0;
9120         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9121         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9122         chk->rec.chunk_id.can_take_data = 1;
9123         chk->sent = SCTP_DATAGRAM_UNSENT;
9124         chk->snd_count = 0;
9125         chk->flags = 0;
9126         chk->asoc = &stcb->asoc;
9127         chk->data = m_shutdown;
9128         chk->whoTo = net;
9129         if (chk->whoTo) {
9130                 atomic_add_int(&chk->whoTo->ref_count, 1);
9131         }
9132         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9133         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9134         shutdown_cp->ch.chunk_flags = 0;
9135         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9136         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9137         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9138         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9139         chk->asoc->ctrl_queue_cnt++;
9140         return;
9141 }
9142
9143 void
9144 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9145 {
9146         /*
9147          * formulate and queue an ASCONF to the peer. ASCONF parameters
9148          * should be queued on the assoc queue.
9149          */
9150         struct sctp_tmit_chunk *chk;
9151         struct mbuf *m_asconf;
9152         int len;
9153
9154         SCTP_TCB_LOCK_ASSERT(stcb);
9155
9156         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9157             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9158                 /* can't send a new one if there is one in flight already */
9159                 return;
9160         }
9161         /* compose an ASCONF chunk, maximum length is PMTU */
9162         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9163         if (m_asconf == NULL) {
9164                 return;
9165         }
9166         sctp_alloc_a_chunk(stcb, chk);
9167         if (chk == NULL) {
9168                 /* no memory */
9169                 sctp_m_freem(m_asconf);
9170                 return;
9171         }
9172         chk->copy_by_ref = 0;
9173         chk->data = m_asconf;
9174         chk->send_size = len;
9175         chk->rec.chunk_id.id = SCTP_ASCONF;
9176         chk->rec.chunk_id.can_take_data = 0;
9177         chk->sent = SCTP_DATAGRAM_UNSENT;
9178         chk->snd_count = 0;
9179         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9180         chk->asoc = &stcb->asoc;
9181         chk->whoTo = net;
9182         if (chk->whoTo) {
9183                 atomic_add_int(&chk->whoTo->ref_count, 1);
9184         }
9185         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9186         chk->asoc->ctrl_queue_cnt++;
9187         return;
9188 }
9189
9190 void
9191 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9192 {
9193         /*
9194          * formulate and queue a asconf-ack back to sender. the asconf-ack
9195          * must be stored in the tcb.
9196          */
9197         struct sctp_tmit_chunk *chk;
9198         struct sctp_asconf_ack *ack, *latest_ack;
9199         struct mbuf *m_ack, *m;
9200         struct sctp_nets *net = NULL;
9201
9202         SCTP_TCB_LOCK_ASSERT(stcb);
9203         /* Get the latest ASCONF-ACK */
9204         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9205         if (latest_ack == NULL) {
9206                 return;
9207         }
9208         if (latest_ack->last_sent_to != NULL &&
9209             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9210                 /* we're doing a retransmission */
9211                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9212                 if (net == NULL) {
9213                         /* no alternate */
9214                         if (stcb->asoc.last_control_chunk_from == NULL) {
9215                                 if (stcb->asoc.alternate) {
9216                                         net = stcb->asoc.alternate;
9217                                 } else {
9218                                         net = stcb->asoc.primary_destination;
9219                                 }
9220                         } else {
9221                                 net = stcb->asoc.last_control_chunk_from;
9222                         }
9223                 }
9224         } else {
9225                 /* normal case */
9226                 if (stcb->asoc.last_control_chunk_from == NULL) {
9227                         if (stcb->asoc.alternate) {
9228                                 net = stcb->asoc.alternate;
9229                         } else {
9230                                 net = stcb->asoc.primary_destination;
9231                         }
9232                 } else {
9233                         net = stcb->asoc.last_control_chunk_from;
9234                 }
9235         }
9236         latest_ack->last_sent_to = net;
9237
9238         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9239                 if (ack->data == NULL) {
9240                         continue;
9241                 }
9242                 /* copy the asconf_ack */
9243                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9244                 if (m_ack == NULL) {
9245                         /* couldn't copy it */
9246                         return;
9247                 }
9248 #ifdef SCTP_MBUF_LOGGING
9249                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9250                         struct mbuf *mat;
9251
9252                         mat = m_ack;
9253                         while (mat) {
9254                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9255                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9256                                 }
9257                                 mat = SCTP_BUF_NEXT(mat);
9258                         }
9259                 }
9260 #endif
9261
9262                 sctp_alloc_a_chunk(stcb, chk);
9263                 if (chk == NULL) {
9264                         /* no memory */
9265                         if (m_ack)
9266                                 sctp_m_freem(m_ack);
9267                         return;
9268                 }
9269                 chk->copy_by_ref = 0;
9270
9271                 chk->whoTo = net;
9272                 if (chk->whoTo) {
9273                         atomic_add_int(&chk->whoTo->ref_count, 1);
9274                 }
9275                 chk->data = m_ack;
9276                 chk->send_size = 0;
9277                 /* Get size */
9278                 m = m_ack;
9279                 chk->send_size = ack->len;
9280                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9281                 chk->rec.chunk_id.can_take_data = 1;
9282                 chk->sent = SCTP_DATAGRAM_UNSENT;
9283                 chk->snd_count = 0;
9284                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9285                 chk->asoc = &stcb->asoc;
9286
9287                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9288                 chk->asoc->ctrl_queue_cnt++;
9289         }
9290         return;
9291 }
9292
9293
9294 static int
9295 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9296     struct sctp_tcb *stcb,
9297     struct sctp_association *asoc,
9298     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9299 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9300     SCTP_UNUSED
9301 #endif
9302 )
9303 {
9304         /*-
9305          * send out one MTU of retransmission. If fast_retransmit is
9306          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9307          * rwnd. For a Cookie or Asconf in the control chunk queue we
9308          * retransmit them by themselves.
9309          *
9310          * For data chunks we will pick out the lowest TSN's in the sent_queue
9311          * marked for resend and bundle them all together (up to a MTU of
9312          * destination). The address to send to should have been
9313          * selected/changed where the retransmission was marked (i.e. in FR
9314          * or t3-timeout routines).
9315          */
9316         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9317         struct sctp_tmit_chunk *chk, *fwd;
9318         struct mbuf *m, *endofchain;
9319         struct sctp_nets *net = NULL;
9320         uint32_t tsns_sent = 0;
9321         int no_fragmentflg, bundle_at, cnt_thru;
9322         unsigned int mtu;
9323         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9324         struct sctp_auth_chunk *auth = NULL;
9325         uint32_t auth_offset = 0;
9326         uint16_t auth_keyid;
9327         int override_ok = 1;
9328         int data_auth_reqd = 0;
9329         uint32_t dmtu = 0;
9330
9331         SCTP_TCB_LOCK_ASSERT(stcb);
9332         tmr_started = ctl_cnt = bundle_at = error = 0;
9333         no_fragmentflg = 1;
9334         fwd_tsn = 0;
9335         *cnt_out = 0;
9336         fwd = NULL;
9337         endofchain = m = NULL;
9338         auth_keyid = stcb->asoc.authinfo.active_keyid;
9339 #ifdef SCTP_AUDITING_ENABLED
9340         sctp_audit_log(0xC3, 1);
9341 #endif
9342         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9343             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9344                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9345                     asoc->sent_queue_retran_cnt);
9346                 asoc->sent_queue_cnt = 0;
9347                 asoc->sent_queue_cnt_removeable = 0;
9348                 /* send back 0/0 so we enter normal transmission */
9349                 *cnt_out = 0;
9350                 return (0);
9351         }
9352         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9353                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9354                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9355                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9356                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9357                                 continue;
9358                         }
9359                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9360                                 if (chk != asoc->str_reset) {
9361                                         /*
9362                                          * not eligible for retran if its
9363                                          * not ours
9364                                          */
9365                                         continue;
9366                                 }
9367                         }
9368                         ctl_cnt++;
9369                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9370                                 fwd_tsn = 1;
9371                                 fwd = chk;
9372                         }
9373                         /*
9374                          * Add an AUTH chunk, if chunk requires it save the
9375                          * offset into the chain for AUTH
9376                          */
9377                         if ((auth == NULL) &&
9378                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9379                             stcb->asoc.peer_auth_chunks))) {
9380                                 m = sctp_add_auth_chunk(m, &endofchain,
9381                                     &auth, &auth_offset,
9382                                     stcb,
9383                                     chk->rec.chunk_id.id);
9384                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9385                         }
9386                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9387                         break;
9388                 }
9389         }
9390         one_chunk = 0;
9391         cnt_thru = 0;
9392         /* do we have control chunks to retransmit? */
9393         if (m != NULL) {
9394                 /* Start a timer no matter if we suceed or fail */
9395                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9396                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9397                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9398                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9399                 chk->snd_count++;       /* update our count */
9400                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9401                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9402                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9403                     no_fragmentflg, 0, NULL, 0,
9404                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9405                     chk->whoTo->port, so_locked, NULL, NULL))) {
9406                         SCTP_STAT_INCR(sctps_lowlevelerr);
9407                         return (error);
9408                 }
9409                 m = endofchain = NULL;
9410                 auth = NULL;
9411                 auth_offset = 0;
9412                 /*
9413                  * We don't want to mark the net->sent time here since this
9414                  * we use this for HB and retrans cannot measure RTT
9415                  */
9416                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9417                 *cnt_out += 1;
9418                 chk->sent = SCTP_DATAGRAM_SENT;
9419                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9420                 if (fwd_tsn == 0) {
9421                         return (0);
9422                 } else {
9423                         /* Clean up the fwd-tsn list */
9424                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9425                         return (0);
9426                 }
9427         }
9428         /*
9429          * Ok, it is just data retransmission we need to do or that and a
9430          * fwd-tsn with it all.
9431          */
9432         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9433                 return (SCTP_RETRAN_DONE);
9434         }
9435         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9436             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9437                 /* not yet open, resend the cookie and that is it */
9438                 return (1);
9439         }
9440 #ifdef SCTP_AUDITING_ENABLED
9441         sctp_auditing(20, inp, stcb, NULL);
9442 #endif
9443         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9444         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9445                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9446                         /* No, not sent to this net or not ready for rtx */
9447                         continue;
9448                 }
9449                 if (chk->data == NULL) {
9450                         printf("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9451                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9452                         continue;
9453                 }
9454                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9455                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9456                         /* Gak, we have exceeded max unlucky retran, abort! */
9457                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9458                             chk->snd_count,
9459                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9460                         atomic_add_int(&stcb->asoc.refcnt, 1);
9461                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
9462                         SCTP_TCB_LOCK(stcb);
9463                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9464                         return (SCTP_RETRAN_EXIT);
9465                 }
9466                 /* pick up the net */
9467                 net = chk->whoTo;
9468                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
9469                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
9470                 } else {
9471                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9472                 }
9473
9474                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9475                         /* No room in peers rwnd */
9476                         uint32_t tsn;
9477
9478                         tsn = asoc->last_acked_seq + 1;
9479                         if (tsn == chk->rec.data.TSN_seq) {
9480                                 /*
9481                                  * we make a special exception for this
9482                                  * case. The peer has no rwnd but is missing
9483                                  * the lowest chunk.. which is probably what
9484                                  * is holding up the rwnd.
9485                                  */
9486                                 goto one_chunk_around;
9487                         }
9488                         return (1);
9489                 }
9490 one_chunk_around:
9491                 if (asoc->peers_rwnd < mtu) {
9492                         one_chunk = 1;
9493                         if ((asoc->peers_rwnd == 0) &&
9494                             (asoc->total_flight == 0)) {
9495                                 chk->window_probe = 1;
9496                                 chk->whoTo->window_probe = 1;
9497                         }
9498                 }
9499 #ifdef SCTP_AUDITING_ENABLED
9500                 sctp_audit_log(0xC3, 2);
9501 #endif
9502                 bundle_at = 0;
9503                 m = NULL;
9504                 net->fast_retran_ip = 0;
9505                 if (chk->rec.data.doing_fast_retransmit == 0) {
9506                         /*
9507                          * if no FR in progress skip destination that have
9508                          * flight_size > cwnd.
9509                          */
9510                         if (net->flight_size >= net->cwnd) {
9511                                 continue;
9512                         }
9513                 } else {
9514                         /*
9515                          * Mark the destination net to have FR recovery
9516                          * limits put on it.
9517                          */
9518                         *fr_done = 1;
9519                         net->fast_retran_ip = 1;
9520                 }
9521
9522                 /*
9523                  * if no AUTH is yet included and this chunk requires it,
9524                  * make sure to account for it.  We don't apply the size
9525                  * until the AUTH chunk is actually added below in case
9526                  * there is no room for this chunk.
9527                  */
9528                 if (data_auth_reqd && (auth == NULL)) {
9529                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9530                 } else
9531                         dmtu = 0;
9532
9533                 if ((chk->send_size <= (mtu - dmtu)) ||
9534                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9535                         /* ok we will add this one */
9536                         if (data_auth_reqd) {
9537                                 if (auth == NULL) {
9538                                         m = sctp_add_auth_chunk(m,
9539                                             &endofchain,
9540                                             &auth,
9541                                             &auth_offset,
9542                                             stcb,
9543                                             SCTP_DATA);
9544                                         auth_keyid = chk->auth_keyid;
9545                                         override_ok = 0;
9546                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9547                                 } else if (override_ok) {
9548                                         auth_keyid = chk->auth_keyid;
9549                                         override_ok = 0;
9550                                 } else if (chk->auth_keyid != auth_keyid) {
9551                                         /* different keyid, so done bundling */
9552                                         break;
9553                                 }
9554                         }
9555                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9556                         if (m == NULL) {
9557                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9558                                 return (ENOMEM);
9559                         }
9560                         /* Do clear IP_DF ? */
9561                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9562                                 no_fragmentflg = 0;
9563                         }
9564                         /* upate our MTU size */
9565                         if (mtu > (chk->send_size + dmtu))
9566                                 mtu -= (chk->send_size + dmtu);
9567                         else
9568                                 mtu = 0;
9569                         data_list[bundle_at++] = chk;
9570                         if (one_chunk && (asoc->total_flight <= 0)) {
9571                                 SCTP_STAT_INCR(sctps_windowprobed);
9572                         }
9573                 }
9574                 if (one_chunk == 0) {
9575                         /*
9576                          * now are there anymore forward from chk to pick
9577                          * up?
9578                          */
9579                         fwd = TAILQ_NEXT(chk, sctp_next);
9580                         while (fwd) {
9581                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9582                                         /* Nope, not for retran */
9583                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9584                                         continue;
9585                                 }
9586                                 if (fwd->whoTo != net) {
9587                                         /* Nope, not the net in question */
9588                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9589                                         continue;
9590                                 }
9591                                 if (data_auth_reqd && (auth == NULL)) {
9592                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9593                                 } else
9594                                         dmtu = 0;
9595                                 if (fwd->send_size <= (mtu - dmtu)) {
9596                                         if (data_auth_reqd) {
9597                                                 if (auth == NULL) {
9598                                                         m = sctp_add_auth_chunk(m,
9599                                                             &endofchain,
9600                                                             &auth,
9601                                                             &auth_offset,
9602                                                             stcb,
9603                                                             SCTP_DATA);
9604                                                         auth_keyid = fwd->auth_keyid;
9605                                                         override_ok = 0;
9606                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9607                                                 } else if (override_ok) {
9608                                                         auth_keyid = fwd->auth_keyid;
9609                                                         override_ok = 0;
9610                                                 } else if (fwd->auth_keyid != auth_keyid) {
9611                                                         /*
9612                                                          * different keyid,
9613                                                          * so done bundling
9614                                                          */
9615                                                         break;
9616                                                 }
9617                                         }
9618                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9619                                         if (m == NULL) {
9620                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9621                                                 return (ENOMEM);
9622                                         }
9623                                         /* Do clear IP_DF ? */
9624                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9625                                                 no_fragmentflg = 0;
9626                                         }
9627                                         /* upate our MTU size */
9628                                         if (mtu > (fwd->send_size + dmtu))
9629                                                 mtu -= (fwd->send_size + dmtu);
9630                                         else
9631                                                 mtu = 0;
9632                                         data_list[bundle_at++] = fwd;
9633                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9634                                                 break;
9635                                         }
9636                                         fwd = TAILQ_NEXT(fwd, sctp_next);
9637                                 } else {
9638                                         /* can't fit so we are done */
9639                                         break;
9640                                 }
9641                         }
9642                 }
9643                 /* Is there something to send for this destination? */
9644                 if (m) {
9645                         /*
9646                          * No matter if we fail/or suceed we should start a
9647                          * timer. A failure is like a lost IP packet :-)
9648                          */
9649                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9650                                 /*
9651                                  * no timer running on this destination
9652                                  * restart it.
9653                                  */
9654                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9655                                 tmr_started = 1;
9656                         }
9657                         /* Now lets send it, if there is anything to send :> */
9658                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9659                             (struct sockaddr *)&net->ro._l_addr, m,
9660                             auth_offset, auth, auth_keyid,
9661                             no_fragmentflg, 0, NULL, 0,
9662                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9663                             net->port, so_locked, NULL, NULL))) {
9664                                 /* error, we could not output */
9665                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9666                                 return (error);
9667                         }
9668                         m = endofchain = NULL;
9669                         auth = NULL;
9670                         auth_offset = 0;
9671                         /* For HB's */
9672                         /*
9673                          * We don't want to mark the net->sent time here
9674                          * since this we use this for HB and retrans cannot
9675                          * measure RTT
9676                          */
9677                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9678
9679                         /* For auto-close */
9680                         cnt_thru++;
9681                         if (*now_filled == 0) {
9682                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9683                                 *now = asoc->time_last_sent;
9684                                 *now_filled = 1;
9685                         } else {
9686                                 asoc->time_last_sent = *now;
9687                         }
9688                         *cnt_out += bundle_at;
9689 #ifdef SCTP_AUDITING_ENABLED
9690                         sctp_audit_log(0xC4, bundle_at);
9691 #endif
9692                         if (bundle_at) {
9693                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9694                         }
9695                         for (i = 0; i < bundle_at; i++) {
9696                                 SCTP_STAT_INCR(sctps_sendretransdata);
9697                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9698                                 /*
9699                                  * When we have a revoked data, and we
9700                                  * retransmit it, then we clear the revoked
9701                                  * flag since this flag dictates if we
9702                                  * subtracted from the fs
9703                                  */
9704                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9705                                         /* Deflate the cwnd */
9706                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9707                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9708                                 }
9709                                 data_list[i]->snd_count++;
9710                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9711                                 /* record the time */
9712                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9713                                 if (data_list[i]->book_size_scale) {
9714                                         /*
9715                                          * need to double the book size on
9716                                          * this one
9717                                          */
9718                                         data_list[i]->book_size_scale = 0;
9719                                         /*
9720                                          * Since we double the booksize, we
9721                                          * must also double the output queue
9722                                          * size, since this get shrunk when
9723                                          * we free by this amount.
9724                                          */
9725                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9726                                         data_list[i]->book_size *= 2;
9727
9728
9729                                 } else {
9730                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9731                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9732                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9733                                         }
9734                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9735                                             (uint32_t) (data_list[i]->send_size +
9736                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9737                                 }
9738                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9739                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9740                                             data_list[i]->whoTo->flight_size,
9741                                             data_list[i]->book_size,
9742                                             (uintptr_t) data_list[i]->whoTo,
9743                                             data_list[i]->rec.data.TSN_seq);
9744                                 }
9745                                 sctp_flight_size_increase(data_list[i]);
9746                                 sctp_total_flight_increase(stcb, data_list[i]);
9747                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9748                                         /* SWS sender side engages */
9749                                         asoc->peers_rwnd = 0;
9750                                 }
9751                                 if ((i == 0) &&
9752                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9753                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9754                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9755                                             (tmr_started == 0)) {
9756                                                 /*-
9757                                                  * ok we just fast-retrans'd
9758                                                  * the lowest TSN, i.e the
9759                                                  * first on the list. In
9760                                                  * this case we want to give
9761                                                  * some more time to get a
9762                                                  * SACK back without a
9763                                                  * t3-expiring.
9764                                                  */
9765                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9766                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9767                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9768                                         }
9769                                 }
9770                         }
9771                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9772                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9773                         }
9774 #ifdef SCTP_AUDITING_ENABLED
9775                         sctp_auditing(21, inp, stcb, NULL);
9776 #endif
9777                 } else {
9778                         /* None will fit */
9779                         return (1);
9780                 }
9781                 if (asoc->sent_queue_retran_cnt <= 0) {
9782                         /* all done we have no more to retran */
9783                         asoc->sent_queue_retran_cnt = 0;
9784                         break;
9785                 }
9786                 if (one_chunk) {
9787                         /* No more room in rwnd */
9788                         return (1);
9789                 }
9790                 /* stop the for loop here. we sent out a packet */
9791                 break;
9792         }
9793         return (0);
9794 }
9795
9796
9797 static int
9798 sctp_timer_validation(struct sctp_inpcb *inp,
9799     struct sctp_tcb *stcb,
9800     struct sctp_association *asoc,
9801     int ret)
9802 {
9803         struct sctp_nets *net;
9804
9805         /* Validate that a timer is running somewhere */
9806         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9807                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9808                         /* Here is a timer */
9809                         return (ret);
9810                 }
9811         }
9812         SCTP_TCB_LOCK_ASSERT(stcb);
9813         /* Gak, we did not have a timer somewhere */
9814         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9815         if (asoc->alternate) {
9816                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9817         } else {
9818                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9819         }
9820         return (ret);
9821 }
9822
9823 void
9824 sctp_chunk_output(struct sctp_inpcb *inp,
9825     struct sctp_tcb *stcb,
9826     int from_where,
9827     int so_locked
9828 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9829     SCTP_UNUSED
9830 #endif
9831 )
9832 {
9833         /*-
9834          * Ok this is the generic chunk service queue. we must do the
9835          * following:
9836          * - See if there are retransmits pending, if so we must
9837          *   do these first.
9838          * - Service the stream queue that is next, moving any
9839          *   message (note I must get a complete message i.e.
9840          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9841          *   TSN's
9842          * - Check to see if the cwnd/rwnd allows any output, if so we
9843          *   go ahead and fomulate and send the low level chunks. Making sure
9844          *   to combine any control in the control chunk queue also.
9845          */
9846         struct sctp_association *asoc;
9847         struct sctp_nets *net;
9848         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9849         unsigned int burst_cnt = 0;
9850         struct timeval now;
9851         int now_filled = 0;
9852         int nagle_on;
9853         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9854         int un_sent = 0;
9855         int fr_done;
9856         unsigned int tot_frs = 0;
9857
9858         asoc = &stcb->asoc;
9859         /* The Nagle algorithm is only applied when handling a send call. */
9860         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9861                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9862                         nagle_on = 0;
9863                 } else {
9864                         nagle_on = 1;
9865                 }
9866         } else {
9867                 nagle_on = 0;
9868         }
9869         SCTP_TCB_LOCK_ASSERT(stcb);
9870
9871         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9872
9873         if ((un_sent <= 0) &&
9874             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9875             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9876             (asoc->sent_queue_retran_cnt == 0)) {
9877                 /* Nothing to do unless there is something to be sent left */
9878                 return;
9879         }
9880         /*
9881          * Do we have something to send, data or control AND a sack timer
9882          * running, if so piggy-back the sack.
9883          */
9884         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9885                 sctp_send_sack(stcb, so_locked);
9886                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9887         }
9888         while (asoc->sent_queue_retran_cnt) {
9889                 /*-
9890                  * Ok, it is retransmission time only, we send out only ONE
9891                  * packet with a single call off to the retran code.
9892                  */
9893                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9894                         /*-
9895                          * Special hook for handling cookiess discarded
9896                          * by peer that carried data. Send cookie-ack only
9897                          * and then the next call with get the retran's.
9898                          */
9899                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9900                             from_where,
9901                             &now, &now_filled, frag_point, so_locked);
9902                         return;
9903                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9904                         /* if its not from a HB then do it */
9905                         fr_done = 0;
9906                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9907                         if (fr_done) {
9908                                 tot_frs++;
9909                         }
9910                 } else {
9911                         /*
9912                          * its from any other place, we don't allow retran
9913                          * output (only control)
9914                          */
9915                         ret = 1;
9916                 }
9917                 if (ret > 0) {
9918                         /* Can't send anymore */
9919                         /*-
9920                          * now lets push out control by calling med-level
9921                          * output once. this assures that we WILL send HB's
9922                          * if queued too.
9923                          */
9924                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9925                             from_where,
9926                             &now, &now_filled, frag_point, so_locked);
9927 #ifdef SCTP_AUDITING_ENABLED
9928                         sctp_auditing(8, inp, stcb, NULL);
9929 #endif
9930                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
9931                         return;
9932                 }
9933                 if (ret < 0) {
9934                         /*-
9935                          * The count was off.. retran is not happening so do
9936                          * the normal retransmission.
9937                          */
9938 #ifdef SCTP_AUDITING_ENABLED
9939                         sctp_auditing(9, inp, stcb, NULL);
9940 #endif
9941                         if (ret == SCTP_RETRAN_EXIT) {
9942                                 return;
9943                         }
9944                         break;
9945                 }
9946                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9947                         /* Only one transmission allowed out of a timeout */
9948 #ifdef SCTP_AUDITING_ENABLED
9949                         sctp_auditing(10, inp, stcb, NULL);
9950 #endif
9951                         /* Push out any control */
9952                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9953                             &now, &now_filled, frag_point, so_locked);
9954                         return;
9955                 }
9956                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9957                         /* Hit FR burst limit */
9958                         return;
9959                 }
9960                 if ((num_out == 0) && (ret == 0)) {
9961                         /* No more retrans to send */
9962                         break;
9963                 }
9964         }
9965 #ifdef SCTP_AUDITING_ENABLED
9966         sctp_auditing(12, inp, stcb, NULL);
9967 #endif
9968         /* Check for bad destinations, if they exist move chunks around. */
9969         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9970                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9971                         /*-
9972                          * if possible move things off of this address we
9973                          * still may send below due to the dormant state but
9974                          * we try to find an alternate address to send to
9975                          * and if we have one we move all queued data on the
9976                          * out wheel to this alternate address.
9977                          */
9978                         if (net->ref_count > 1)
9979                                 sctp_move_chunks_from_net(stcb, net);
9980                 } else {
9981                         /*-
9982                          * if ((asoc->sat_network) || (net->addr_is_local))
9983                          * { burst_limit = asoc->max_burst *
9984                          * SCTP_SAT_NETWORK_BURST_INCR; }
9985                          */
9986                         if (asoc->max_burst > 0) {
9987                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9988                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9989                                                 /*
9990                                                  * JRS - Use the congestion
9991                                                  * control given in the
9992                                                  * congestion control module
9993                                                  */
9994                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9995                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9996                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9997                                                 }
9998                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9999                                         }
10000                                         net->fast_retran_ip = 0;
10001                                 } else {
10002                                         if (net->flight_size == 0) {
10003                                                 /*
10004                                                  * Should be decaying the
10005                                                  * cwnd here
10006                                                  */
10007                                                 ;
10008                                         }
10009                                 }
10010                         }
10011                 }
10012
10013         }
10014         burst_cnt = 0;
10015         do {
10016                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10017                     &reason_code, 0, from_where,
10018                     &now, &now_filled, frag_point, so_locked);
10019                 if (error) {
10020                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10021                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10022                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10023                         }
10024                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10025                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10026                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10027                         }
10028                         break;
10029                 }
10030                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10031
10032                 tot_out += num_out;
10033                 burst_cnt++;
10034                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10035                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10036                         if (num_out == 0) {
10037                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10038                         }
10039                 }
10040                 if (nagle_on) {
10041                         /*
10042                          * When the Nagle algorithm is used, look at how
10043                          * much is unsent, then if its smaller than an MTU
10044                          * and we have data in flight we stop, except if we
10045                          * are handling a fragmented user message.
10046                          */
10047                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10048                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10049                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10050                             (stcb->asoc.total_flight > 0) &&
10051                             ((stcb->asoc.locked_on_sending == NULL) ||
10052                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10053                                 break;
10054                         }
10055                 }
10056                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10057                     TAILQ_EMPTY(&asoc->send_queue) &&
10058                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10059                         /* Nothing left to send */
10060                         break;
10061                 }
10062                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10063                         /* Nothing left to send */
10064                         break;
10065                 }
10066         } while (num_out &&
10067             ((asoc->max_burst == 0) ||
10068             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10069             (burst_cnt < asoc->max_burst)));
10070
10071         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10072                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10073                         SCTP_STAT_INCR(sctps_maxburstqueued);
10074                         asoc->burst_limit_applied = 1;
10075                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10076                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10077                         }
10078                 } else {
10079                         asoc->burst_limit_applied = 0;
10080                 }
10081         }
10082         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10083                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10084         }
10085         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10086             tot_out);
10087
10088         /*-
10089          * Now we need to clean up the control chunk chain if a ECNE is on
10090          * it. It must be marked as UNSENT again so next call will continue
10091          * to send it until such time that we get a CWR, to remove it.
10092          */
10093         if (stcb->asoc.ecn_echo_cnt_onq)
10094                 sctp_fix_ecn_echo(asoc);
10095         return;
10096 }
10097
10098
10099 int
10100 sctp_output(inp, m, addr, control, p, flags)
10101         struct sctp_inpcb *inp;
10102         struct mbuf *m;
10103         struct sockaddr *addr;
10104         struct mbuf *control;
10105         struct thread *p;
10106         int flags;
10107 {
10108         if (inp == NULL) {
10109                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10110                 return (EINVAL);
10111         }
10112         if (inp->sctp_socket == NULL) {
10113                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10114                 return (EINVAL);
10115         }
10116         return (sctp_sosend(inp->sctp_socket,
10117             addr,
10118             (struct uio *)NULL,
10119             m,
10120             control,
10121             flags, p
10122             ));
10123 }
10124
10125 void
10126 send_forward_tsn(struct sctp_tcb *stcb,
10127     struct sctp_association *asoc)
10128 {
10129         struct sctp_tmit_chunk *chk;
10130         struct sctp_forward_tsn_chunk *fwdtsn;
10131         uint32_t advance_peer_ack_point;
10132
10133         SCTP_TCB_LOCK_ASSERT(stcb);
10134         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10135                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10136                         /* mark it to unsent */
10137                         chk->sent = SCTP_DATAGRAM_UNSENT;
10138                         chk->snd_count = 0;
10139                         /* Do we correct its output location? */
10140                         if (chk->whoTo) {
10141                                 sctp_free_remote_addr(chk->whoTo);
10142                                 chk->whoTo = NULL;
10143                         }
10144                         goto sctp_fill_in_rest;
10145                 }
10146         }
10147         /* Ok if we reach here we must build one */
10148         sctp_alloc_a_chunk(stcb, chk);
10149         if (chk == NULL) {
10150                 return;
10151         }
10152         asoc->fwd_tsn_cnt++;
10153         chk->copy_by_ref = 0;
10154         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10155         chk->rec.chunk_id.can_take_data = 0;
10156         chk->asoc = asoc;
10157         chk->whoTo = NULL;
10158         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10159         if (chk->data == NULL) {
10160                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10161                 return;
10162         }
10163         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10164         chk->sent = SCTP_DATAGRAM_UNSENT;
10165         chk->snd_count = 0;
10166         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10167         asoc->ctrl_queue_cnt++;
10168 sctp_fill_in_rest:
10169         /*-
10170          * Here we go through and fill out the part that deals with
10171          * stream/seq of the ones we skip.
10172          */
10173         SCTP_BUF_LEN(chk->data) = 0;
10174         {
10175                 struct sctp_tmit_chunk *at, *tp1, *last;
10176                 struct sctp_strseq *strseq;
10177                 unsigned int cnt_of_space, i, ovh;
10178                 unsigned int space_needed;
10179                 unsigned int cnt_of_skipped = 0;
10180
10181                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10182                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10183                                 /* no more to look at */
10184                                 break;
10185                         }
10186                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10187                                 /* We don't report these */
10188                                 continue;
10189                         }
10190                         cnt_of_skipped++;
10191                 }
10192                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10193                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10194
10195                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10196
10197                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10198                         ovh = SCTP_MIN_OVERHEAD;
10199                 } else {
10200                         ovh = SCTP_MIN_V4_OVERHEAD;
10201                 }
10202                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10203                         /* trim to a mtu size */
10204                         cnt_of_space = asoc->smallest_mtu - ovh;
10205                 }
10206                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10207                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10208                             0xff, 0, cnt_of_skipped,
10209                             asoc->advanced_peer_ack_point);
10210
10211                 }
10212                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10213                 if (cnt_of_space < space_needed) {
10214                         /*-
10215                          * ok we must trim down the chunk by lowering the
10216                          * advance peer ack point.
10217                          */
10218                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10219                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10220                                     0xff, 0xff, cnt_of_space,
10221                                     space_needed);
10222                         }
10223                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10224                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10225                         /*-
10226                          * Go through and find the TSN that will be the one
10227                          * we report.
10228                          */
10229                         at = TAILQ_FIRST(&asoc->sent_queue);
10230                         for (i = 0; i < cnt_of_skipped; i++) {
10231                                 tp1 = TAILQ_NEXT(at, sctp_next);
10232                                 if (tp1 == NULL) {
10233                                         break;
10234                                 }
10235                                 at = tp1;
10236                         }
10237                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10238                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10239                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10240                                     asoc->advanced_peer_ack_point);
10241                         }
10242                         last = at;
10243                         /*-
10244                          * last now points to last one I can report, update
10245                          * peer ack point
10246                          */
10247                         if (last)
10248                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10249                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10250                             cnt_of_skipped * sizeof(struct sctp_strseq);
10251                 }
10252                 chk->send_size = space_needed;
10253                 /* Setup the chunk */
10254                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10255                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10256                 fwdtsn->ch.chunk_flags = 0;
10257                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10258                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10259                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10260                 fwdtsn++;
10261                 /*-
10262                  * Move pointer to after the fwdtsn and transfer to the
10263                  * strseq pointer.
10264                  */
10265                 strseq = (struct sctp_strseq *)fwdtsn;
10266                 /*-
10267                  * Now populate the strseq list. This is done blindly
10268                  * without pulling out duplicate stream info. This is
10269                  * inefficent but won't harm the process since the peer will
10270                  * look at these in sequence and will thus release anything.
10271                  * It could mean we exceed the PMTU and chop off some that
10272                  * we could have included.. but this is unlikely (aka 1432/4
10273                  * would mean 300+ stream seq's would have to be reported in
10274                  * one FWD-TSN. With a bit of work we can later FIX this to
10275                  * optimize and pull out duplcates.. but it does add more
10276                  * overhead. So for now... not!
10277                  */
10278                 at = TAILQ_FIRST(&asoc->sent_queue);
10279                 for (i = 0; i < cnt_of_skipped; i++) {
10280                         tp1 = TAILQ_NEXT(at, sctp_next);
10281                         if (tp1 == NULL)
10282                                 break;
10283                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10284                                 /* We don't report these */
10285                                 i--;
10286                                 at = tp1;
10287                                 continue;
10288                         }
10289                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10290                                 at->rec.data.fwd_tsn_cnt = 0;
10291                         }
10292                         strseq->stream = ntohs(at->rec.data.stream_number);
10293                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10294                         strseq++;
10295                         at = tp1;
10296                 }
10297         }
10298         return;
10299
10300 }
10301
10302 void
10303 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10304 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10305     SCTP_UNUSED
10306 #endif
10307 )
10308 {
10309         /*-
10310          * Queue up a SACK or NR-SACK in the control queue.
10311          * We must first check to see if a SACK or NR-SACK is
10312          * somehow on the control queue.
10313          * If so, we will take and and remove the old one.
10314          */
10315         struct sctp_association *asoc;
10316         struct sctp_tmit_chunk *chk, *a_chk;
10317         struct sctp_sack_chunk *sack;
10318         struct sctp_nr_sack_chunk *nr_sack;
10319         struct sctp_gap_ack_block *gap_descriptor;
10320         struct sack_track *selector;
10321         int mergeable = 0;
10322         int offset;
10323         caddr_t limit;
10324         uint32_t *dup;
10325         int limit_reached = 0;
10326         unsigned int i, siz, j;
10327         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10328         int num_dups = 0;
10329         int space_req;
10330         uint32_t highest_tsn;
10331         uint8_t flags;
10332         uint8_t type;
10333         uint8_t tsn_map;
10334
10335         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10336             (stcb->asoc.peer_supports_nr_sack == 1)) {
10337                 type = SCTP_NR_SELECTIVE_ACK;
10338         } else {
10339                 type = SCTP_SELECTIVE_ACK;
10340         }
10341         a_chk = NULL;
10342         asoc = &stcb->asoc;
10343         SCTP_TCB_LOCK_ASSERT(stcb);
10344         if (asoc->last_data_chunk_from == NULL) {
10345                 /* Hmm we never received anything */
10346                 return;
10347         }
10348         sctp_slide_mapping_arrays(stcb);
10349         sctp_set_rwnd(stcb, asoc);
10350         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10351                 if (chk->rec.chunk_id.id == type) {
10352                         /* Hmm, found a sack already on queue, remove it */
10353                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10354                         asoc->ctrl_queue_cnt--;
10355                         a_chk = chk;
10356                         if (a_chk->data) {
10357                                 sctp_m_freem(a_chk->data);
10358                                 a_chk->data = NULL;
10359                         }
10360                         if (a_chk->whoTo) {
10361                                 sctp_free_remote_addr(a_chk->whoTo);
10362                                 a_chk->whoTo = NULL;
10363                         }
10364                         break;
10365                 }
10366         }
10367         if (a_chk == NULL) {
10368                 sctp_alloc_a_chunk(stcb, a_chk);
10369                 if (a_chk == NULL) {
10370                         /* No memory so we drop the idea, and set a timer */
10371                         if (stcb->asoc.delayed_ack) {
10372                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10373                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10374                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10375                                     stcb->sctp_ep, stcb, NULL);
10376                         } else {
10377                                 stcb->asoc.send_sack = 1;
10378                         }
10379                         return;
10380                 }
10381                 a_chk->copy_by_ref = 0;
10382                 a_chk->rec.chunk_id.id = type;
10383                 a_chk->rec.chunk_id.can_take_data = 1;
10384         }
10385         /* Clear our pkt counts */
10386         asoc->data_pkts_seen = 0;
10387
10388         a_chk->asoc = asoc;
10389         a_chk->snd_count = 0;
10390         a_chk->send_size = 0;   /* fill in later */
10391         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10392         a_chk->whoTo = NULL;
10393
10394         if ((asoc->numduptsns) ||
10395             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10396                 /*-
10397                  * Ok, we have some duplicates or the destination for the
10398                  * sack is unreachable, lets see if we can select an
10399                  * alternate than asoc->last_data_chunk_from
10400                  */
10401                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10402                     (asoc->used_alt_onsack > asoc->numnets)) {
10403                         /* We used an alt last time, don't this time */
10404                         a_chk->whoTo = NULL;
10405                 } else {
10406                         asoc->used_alt_onsack++;
10407                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10408                 }
10409                 if (a_chk->whoTo == NULL) {
10410                         /* Nope, no alternate */
10411                         a_chk->whoTo = asoc->last_data_chunk_from;
10412                         asoc->used_alt_onsack = 0;
10413                 }
10414         } else {
10415                 /*
10416                  * No duplicates so we use the last place we received data
10417                  * from.
10418                  */
10419                 asoc->used_alt_onsack = 0;
10420                 a_chk->whoTo = asoc->last_data_chunk_from;
10421         }
10422         if (a_chk->whoTo) {
10423                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10424         }
10425         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10426                 highest_tsn = asoc->highest_tsn_inside_map;
10427         } else {
10428                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10429         }
10430         if (highest_tsn == asoc->cumulative_tsn) {
10431                 /* no gaps */
10432                 if (type == SCTP_SELECTIVE_ACK) {
10433                         space_req = sizeof(struct sctp_sack_chunk);
10434                 } else {
10435                         space_req = sizeof(struct sctp_nr_sack_chunk);
10436                 }
10437         } else {
10438                 /* gaps get a cluster */
10439                 space_req = MCLBYTES;
10440         }
10441         /* Ok now lets formulate a MBUF with our sack */
10442         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10443         if ((a_chk->data == NULL) ||
10444             (a_chk->whoTo == NULL)) {
10445                 /* rats, no mbuf memory */
10446                 if (a_chk->data) {
10447                         /* was a problem with the destination */
10448                         sctp_m_freem(a_chk->data);
10449                         a_chk->data = NULL;
10450                 }
10451                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10452                 /* sa_ignore NO_NULL_CHK */
10453                 if (stcb->asoc.delayed_ack) {
10454                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10455                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10456                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10457                             stcb->sctp_ep, stcb, NULL);
10458                 } else {
10459                         stcb->asoc.send_sack = 1;
10460                 }
10461                 return;
10462         }
10463         /* ok, lets go through and fill it in */
10464         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10465         space = M_TRAILINGSPACE(a_chk->data);
10466         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10467                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10468         }
10469         limit = mtod(a_chk->data, caddr_t);
10470         limit += space;
10471
10472         flags = 0;
10473
10474         if ((asoc->sctp_cmt_on_off > 0) &&
10475             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10476                 /*-
10477                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10478                  * received, then set high bit to 1, else 0. Reset
10479                  * pkts_rcvd.
10480                  */
10481                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10482                 asoc->cmt_dac_pkts_rcvd = 0;
10483         }
10484 #ifdef SCTP_ASOCLOG_OF_TSNS
10485         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10486         stcb->asoc.cumack_log_atsnt++;
10487         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10488                 stcb->asoc.cumack_log_atsnt = 0;
10489         }
10490 #endif
10491         /* reset the readers interpretation */
10492         stcb->freed_by_sorcv_sincelast = 0;
10493
10494         if (type == SCTP_SELECTIVE_ACK) {
10495                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10496                 nr_sack = NULL;
10497                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10498                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10499                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10500                 } else {
10501                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10502                 }
10503         } else {
10504                 sack = NULL;
10505                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10506                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10507                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10508                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10509                 } else {
10510                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10511                 }
10512         }
10513
10514         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10515                 offset = 1;
10516         } else {
10517                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10518         }
10519         if (((type == SCTP_SELECTIVE_ACK) &&
10520             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10521             ((type == SCTP_NR_SELECTIVE_ACK) &&
10522             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10523                 /* we have a gap .. maybe */
10524                 for (i = 0; i < siz; i++) {
10525                         tsn_map = asoc->mapping_array[i];
10526                         if (type == SCTP_SELECTIVE_ACK) {
10527                                 tsn_map |= asoc->nr_mapping_array[i];
10528                         }
10529                         if (i == 0) {
10530                                 /*
10531                                  * Clear all bits corresponding to TSNs
10532                                  * smaller or equal to the cumulative TSN.
10533                                  */
10534                                 tsn_map &= (~0 << (1 - offset));
10535                         }
10536                         selector = &sack_array[tsn_map];
10537                         if (mergeable && selector->right_edge) {
10538                                 /*
10539                                  * Backup, left and right edges were ok to
10540                                  * merge.
10541                                  */
10542                                 num_gap_blocks--;
10543                                 gap_descriptor--;
10544                         }
10545                         if (selector->num_entries == 0)
10546                                 mergeable = 0;
10547                         else {
10548                                 for (j = 0; j < selector->num_entries; j++) {
10549                                         if (mergeable && selector->right_edge) {
10550                                                 /*
10551                                                  * do a merge by NOT setting
10552                                                  * the left side
10553                                                  */
10554                                                 mergeable = 0;
10555                                         } else {
10556                                                 /*
10557                                                  * no merge, set the left
10558                                                  * side
10559                                                  */
10560                                                 mergeable = 0;
10561                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10562                                         }
10563                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10564                                         num_gap_blocks++;
10565                                         gap_descriptor++;
10566                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10567                                                 /* no more room */
10568                                                 limit_reached = 1;
10569                                                 break;
10570                                         }
10571                                 }
10572                                 if (selector->left_edge) {
10573                                         mergeable = 1;
10574                                 }
10575                         }
10576                         if (limit_reached) {
10577                                 /* Reached the limit stop */
10578                                 break;
10579                         }
10580                         offset += 8;
10581                 }
10582         }
10583         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10584             (limit_reached == 0)) {
10585
10586                 mergeable = 0;
10587
10588                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10589                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10590                 } else {
10591                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10592                 }
10593
10594                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10595                         offset = 1;
10596                 } else {
10597                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10598                 }
10599                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10600                         /* we have a gap .. maybe */
10601                         for (i = 0; i < siz; i++) {
10602                                 tsn_map = asoc->nr_mapping_array[i];
10603                                 if (i == 0) {
10604                                         /*
10605                                          * Clear all bits corresponding to
10606                                          * TSNs smaller or equal to the
10607                                          * cumulative TSN.
10608                                          */
10609                                         tsn_map &= (~0 << (1 - offset));
10610                                 }
10611                                 selector = &sack_array[tsn_map];
10612                                 if (mergeable && selector->right_edge) {
10613                                         /*
10614                                          * Backup, left and right edges were
10615                                          * ok to merge.
10616                                          */
10617                                         num_nr_gap_blocks--;
10618                                         gap_descriptor--;
10619                                 }
10620                                 if (selector->num_entries == 0)
10621                                         mergeable = 0;
10622                                 else {
10623                                         for (j = 0; j < selector->num_entries; j++) {
10624                                                 if (mergeable && selector->right_edge) {
10625                                                         /*
10626                                                          * do a merge by NOT
10627                                                          * setting the left
10628                                                          * side
10629                                                          */
10630                                                         mergeable = 0;
10631                                                 } else {
10632                                                         /*
10633                                                          * no merge, set the
10634                                                          * left side
10635                                                          */
10636                                                         mergeable = 0;
10637                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10638                                                 }
10639                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10640                                                 num_nr_gap_blocks++;
10641                                                 gap_descriptor++;
10642                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10643                                                         /* no more room */
10644                                                         limit_reached = 1;
10645                                                         break;
10646                                                 }
10647                                         }
10648                                         if (selector->left_edge) {
10649                                                 mergeable = 1;
10650                                         }
10651                                 }
10652                                 if (limit_reached) {
10653                                         /* Reached the limit stop */
10654                                         break;
10655                                 }
10656                                 offset += 8;
10657                         }
10658                 }
10659         }
10660         /* now we must add any dups we are going to report. */
10661         if ((limit_reached == 0) && (asoc->numduptsns)) {
10662                 dup = (uint32_t *) gap_descriptor;
10663                 for (i = 0; i < asoc->numduptsns; i++) {
10664                         *dup = htonl(asoc->dup_tsns[i]);
10665                         dup++;
10666                         num_dups++;
10667                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10668                                 /* no more room */
10669                                 break;
10670                         }
10671                 }
10672                 asoc->numduptsns = 0;
10673         }
10674         /*
10675          * now that the chunk is prepared queue it to the control chunk
10676          * queue.
10677          */
10678         if (type == SCTP_SELECTIVE_ACK) {
10679                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10680                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10681                     num_dups * sizeof(int32_t);
10682                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10683                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10684                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10685                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10686                 sack->sack.num_dup_tsns = htons(num_dups);
10687                 sack->ch.chunk_type = type;
10688                 sack->ch.chunk_flags = flags;
10689                 sack->ch.chunk_length = htons(a_chk->send_size);
10690         } else {
10691                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10692                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10693                     num_dups * sizeof(int32_t);
10694                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10695                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10696                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10697                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10698                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10699                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10700                 nr_sack->nr_sack.reserved = 0;
10701                 nr_sack->ch.chunk_type = type;
10702                 nr_sack->ch.chunk_flags = flags;
10703                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10704         }
10705         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10706         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10707         asoc->ctrl_queue_cnt++;
10708         asoc->send_sack = 0;
10709         SCTP_STAT_INCR(sctps_sendsacks);
10710         return;
10711 }
10712
10713 void
10714 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10715 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10716     SCTP_UNUSED
10717 #endif
10718 )
10719 {
10720         struct mbuf *m_abort;
10721         struct mbuf *m_out = NULL, *m_end = NULL;
10722         struct sctp_abort_chunk *abort = NULL;
10723         int sz;
10724         uint32_t auth_offset = 0;
10725         struct sctp_auth_chunk *auth = NULL;
10726         struct sctp_nets *net;
10727
10728         /*-
10729          * Add an AUTH chunk, if chunk requires it and save the offset into
10730          * the chain for AUTH
10731          */
10732         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10733             stcb->asoc.peer_auth_chunks)) {
10734                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10735                     stcb, SCTP_ABORT_ASSOCIATION);
10736                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10737         }
10738         SCTP_TCB_LOCK_ASSERT(stcb);
10739         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10740         if (m_abort == NULL) {
10741                 /* no mbuf's */
10742                 if (m_out)
10743                         sctp_m_freem(m_out);
10744                 return;
10745         }
10746         /* link in any error */
10747         SCTP_BUF_NEXT(m_abort) = operr;
10748         sz = 0;
10749         if (operr) {
10750                 struct mbuf *n;
10751
10752                 n = operr;
10753                 while (n) {
10754                         sz += SCTP_BUF_LEN(n);
10755                         n = SCTP_BUF_NEXT(n);
10756                 }
10757         }
10758         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10759         if (m_out == NULL) {
10760                 /* NO Auth chunk prepended, so reserve space in front */
10761                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10762                 m_out = m_abort;
10763         } else {
10764                 /* Put AUTH chunk at the front of the chain */
10765                 SCTP_BUF_NEXT(m_end) = m_abort;
10766         }
10767         if (stcb->asoc.alternate) {
10768                 net = stcb->asoc.alternate;
10769         } else {
10770                 net = stcb->asoc.primary_destination;
10771         }
10772         /* fill in the ABORT chunk */
10773         abort = mtod(m_abort, struct sctp_abort_chunk *);
10774         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10775         abort->ch.chunk_flags = 0;
10776         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10777
10778         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10779             (struct sockaddr *)&net->ro._l_addr,
10780             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0,
10781             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10782             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10783         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10784 }
10785
10786 void
10787 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10788     struct sctp_nets *net,
10789     int reflect_vtag)
10790 {
10791         /* formulate and SEND a SHUTDOWN-COMPLETE */
10792         struct mbuf *m_shutdown_comp;
10793         struct sctp_shutdown_complete_chunk *shutdown_complete;
10794         uint32_t vtag;
10795         uint8_t flags;
10796
10797         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10798         if (m_shutdown_comp == NULL) {
10799                 /* no mbuf's */
10800                 return;
10801         }
10802         if (reflect_vtag) {
10803                 flags = SCTP_HAD_NO_TCB;
10804                 vtag = stcb->asoc.my_vtag;
10805         } else {
10806                 flags = 0;
10807                 vtag = stcb->asoc.peer_vtag;
10808         }
10809         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10810         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10811         shutdown_complete->ch.chunk_flags = flags;
10812         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10813         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10814         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10815             (struct sockaddr *)&net->ro._l_addr,
10816             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0,
10817             stcb->sctp_ep->sctp_lport, stcb->rport,
10818             htonl(vtag),
10819             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10820         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10821         return;
10822 }
10823
10824 void
10825 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
10826     uint32_t vrf_id, uint16_t port)
10827 {
10828         /* formulate and SEND a SHUTDOWN-COMPLETE */
10829         struct mbuf *o_pak;
10830         struct mbuf *mout;
10831         struct ip *iph;
10832         struct udphdr *udp = NULL;
10833         int offset_out, len, mlen;
10834         struct sctp_shutdown_complete_msg *comp_cp;
10835
10836 #ifdef INET
10837         struct ip *iph_out;
10838
10839 #endif
10840 #ifdef INET6
10841         struct ip6_hdr *ip6, *ip6_out;
10842
10843 #endif
10844
10845         iph = mtod(m, struct ip *);
10846         switch (iph->ip_v) {
10847 #ifdef INET
10848         case IPVERSION:
10849                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10850                 break;
10851 #endif
10852 #ifdef INET6
10853         case IPV6_VERSION >> 4:
10854                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10855                 break;
10856 #endif
10857         default:
10858                 return;
10859         }
10860         if (port) {
10861                 len += sizeof(struct udphdr);
10862         }
10863         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10864         if (mout == NULL) {
10865                 return;
10866         }
10867         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10868         SCTP_BUF_LEN(mout) = len;
10869         SCTP_BUF_NEXT(mout) = NULL;
10870         if (m->m_flags & M_FLOWID) {
10871                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10872                 mout->m_flags |= M_FLOWID;
10873         }
10874 #ifdef INET
10875         iph_out = NULL;
10876 #endif
10877 #ifdef INET6
10878         ip6_out = NULL;
10879 #endif
10880         offset_out = 0;
10881
10882         switch (iph->ip_v) {
10883 #ifdef INET
10884         case IPVERSION:
10885                 iph_out = mtod(mout, struct ip *);
10886
10887                 /* Fill in the IP header for the ABORT */
10888                 iph_out->ip_v = IPVERSION;
10889                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10890                 iph_out->ip_tos = (u_char)0;
10891                 iph_out->ip_id = 0;
10892                 iph_out->ip_off = 0;
10893                 iph_out->ip_ttl = MAXTTL;
10894                 if (port) {
10895                         iph_out->ip_p = IPPROTO_UDP;
10896                 } else {
10897                         iph_out->ip_p = IPPROTO_SCTP;
10898                 }
10899                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10900                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10901
10902                 /* let IP layer calculate this */
10903                 iph_out->ip_sum = 0;
10904                 offset_out += sizeof(*iph_out);
10905                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10906                     (caddr_t)iph_out + offset_out);
10907                 break;
10908 #endif
10909 #ifdef INET6
10910         case IPV6_VERSION >> 4:
10911                 ip6 = (struct ip6_hdr *)iph;
10912                 ip6_out = mtod(mout, struct ip6_hdr *);
10913
10914                 /* Fill in the IPv6 header for the ABORT */
10915                 ip6_out->ip6_flow = ip6->ip6_flow;
10916                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10917                 if (port) {
10918                         ip6_out->ip6_nxt = IPPROTO_UDP;
10919                 } else {
10920                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10921                 }
10922                 ip6_out->ip6_src = ip6->ip6_dst;
10923                 ip6_out->ip6_dst = ip6->ip6_src;
10924                 /*
10925                  * ?? The old code had both the iph len + payload, I think
10926                  * this is wrong and would never have worked
10927                  */
10928                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10929                 offset_out += sizeof(*ip6_out);
10930                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10931                     (caddr_t)ip6_out + offset_out);
10932                 break;
10933 #endif                          /* INET6 */
10934         default:
10935                 /* Currently not supported. */
10936                 sctp_m_freem(mout);
10937                 return;
10938         }
10939         if (port) {
10940                 udp = (struct udphdr *)comp_cp;
10941                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10942                 udp->uh_dport = port;
10943                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10944 #ifdef INET
10945                 if (iph_out)
10946                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10947 #endif
10948                 offset_out += sizeof(struct udphdr);
10949                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10950         }
10951         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10952                 /* no mbuf's */
10953                 sctp_m_freem(mout);
10954                 return;
10955         }
10956         /* Now copy in and fill in the ABORT tags etc. */
10957         comp_cp->sh.src_port = sh->dest_port;
10958         comp_cp->sh.dest_port = sh->src_port;
10959         comp_cp->sh.checksum = 0;
10960         comp_cp->sh.v_tag = sh->v_tag;
10961         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
10962         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10963         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10964
10965 #ifdef INET
10966         if (iph_out != NULL) {
10967                 sctp_route_t ro;
10968                 int ret;
10969
10970                 mlen = SCTP_BUF_LEN(mout);
10971                 bzero(&ro, sizeof ro);
10972                 /* set IPv4 length */
10973                 iph_out->ip_len = mlen;
10974 #ifdef  SCTP_PACKET_LOGGING
10975                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
10976                         sctp_packet_log(mout, mlen);
10977 #endif
10978                 if (port) {
10979 #if defined(SCTP_WITH_NO_CSUM)
10980                         SCTP_STAT_INCR(sctps_sendnocrc);
10981 #else
10982                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
10983                         SCTP_STAT_INCR(sctps_sendswcrc);
10984 #endif
10985                         SCTP_ENABLE_UDP_CSUM(mout);
10986                 } else {
10987 #if defined(SCTP_WITH_NO_CSUM)
10988                         SCTP_STAT_INCR(sctps_sendnocrc);
10989 #else
10990                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
10991                         mout->m_pkthdr.csum_data = 0;
10992                         SCTP_STAT_INCR(sctps_sendhwcrc);
10993 #endif
10994                 }
10995                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
10996                 /* out it goes */
10997                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
10998
10999                 /* Free the route if we got one back */
11000                 if (ro.ro_rt)
11001                         RTFREE(ro.ro_rt);
11002         }
11003 #endif
11004 #ifdef INET6
11005         if (ip6_out != NULL) {
11006                 struct route_in6 ro;
11007                 int ret;
11008                 struct ifnet *ifp = NULL;
11009
11010                 bzero(&ro, sizeof(ro));
11011                 mlen = SCTP_BUF_LEN(mout);
11012 #ifdef  SCTP_PACKET_LOGGING
11013                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11014                         sctp_packet_log(mout, mlen);
11015 #endif
11016                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11017                 if (port) {
11018 #if defined(SCTP_WITH_NO_CSUM)
11019                         SCTP_STAT_INCR(sctps_sendnocrc);
11020 #else
11021                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11022                         SCTP_STAT_INCR(sctps_sendswcrc);
11023 #endif
11024                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
11025                                 udp->uh_sum = 0xffff;
11026                         }
11027                 } else {
11028 #if defined(SCTP_WITH_NO_CSUM)
11029                         SCTP_STAT_INCR(sctps_sendnocrc);
11030 #else
11031                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11032                         mout->m_pkthdr.csum_data = 0;
11033                         SCTP_STAT_INCR(sctps_sendhwcrc);
11034 #endif
11035                 }
11036                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11037
11038                 /* Free the route if we got one back */
11039                 if (ro.ro_rt)
11040                         RTFREE(ro.ro_rt);
11041         }
11042 #endif
11043         SCTP_STAT_INCR(sctps_sendpackets);
11044         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11045         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11046         return;
11047
11048 }
11049
11050 void
11051 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11052 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11053     SCTP_UNUSED
11054 #endif
11055 )
11056 {
11057         struct sctp_tmit_chunk *chk;
11058         struct sctp_heartbeat_chunk *hb;
11059         struct timeval now;
11060
11061         SCTP_TCB_LOCK_ASSERT(stcb);
11062         if (net == NULL) {
11063                 return;
11064         }
11065         (void)SCTP_GETTIME_TIMEVAL(&now);
11066         switch (net->ro._l_addr.sa.sa_family) {
11067 #ifdef INET
11068         case AF_INET:
11069                 break;
11070 #endif
11071 #ifdef INET6
11072         case AF_INET6:
11073                 break;
11074 #endif
11075         default:
11076                 return;
11077         }
11078         sctp_alloc_a_chunk(stcb, chk);
11079         if (chk == NULL) {
11080                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11081                 return;
11082         }
11083         chk->copy_by_ref = 0;
11084         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11085         chk->rec.chunk_id.can_take_data = 1;
11086         chk->asoc = &stcb->asoc;
11087         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11088
11089         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11090         if (chk->data == NULL) {
11091                 sctp_free_a_chunk(stcb, chk, so_locked);
11092                 return;
11093         }
11094         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11095         SCTP_BUF_LEN(chk->data) = chk->send_size;
11096         chk->sent = SCTP_DATAGRAM_UNSENT;
11097         chk->snd_count = 0;
11098         chk->whoTo = net;
11099         atomic_add_int(&chk->whoTo->ref_count, 1);
11100         /* Now we have a mbuf that we can fill in with the details */
11101         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11102         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11103         /* fill out chunk header */
11104         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11105         hb->ch.chunk_flags = 0;
11106         hb->ch.chunk_length = htons(chk->send_size);
11107         /* Fill out hb parameter */
11108         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11109         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11110         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11111         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11112         /* Did our user request this one, put it in */
11113         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11114         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11115         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11116                 /*
11117                  * we only take from the entropy pool if the address is not
11118                  * confirmed.
11119                  */
11120                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11121                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11122         } else {
11123                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11124                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11125         }
11126         switch (net->ro._l_addr.sa.sa_family) {
11127 #ifdef INET
11128         case AF_INET:
11129                 memcpy(hb->heartbeat.hb_info.address,
11130                     &net->ro._l_addr.sin.sin_addr,
11131                     sizeof(net->ro._l_addr.sin.sin_addr));
11132                 break;
11133 #endif
11134 #ifdef INET6
11135         case AF_INET6:
11136                 memcpy(hb->heartbeat.hb_info.address,
11137                     &net->ro._l_addr.sin6.sin6_addr,
11138                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11139                 break;
11140 #endif
11141         default:
11142                 return;
11143                 break;
11144         }
11145         net->hb_responded = 0;
11146         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11147         stcb->asoc.ctrl_queue_cnt++;
11148         SCTP_STAT_INCR(sctps_sendheartbeat);
11149         return;
11150 }
11151
11152 void
11153 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11154     uint32_t high_tsn)
11155 {
11156         struct sctp_association *asoc;
11157         struct sctp_ecne_chunk *ecne;
11158         struct sctp_tmit_chunk *chk;
11159
11160         if (net == NULL) {
11161                 return;
11162         }
11163         asoc = &stcb->asoc;
11164         SCTP_TCB_LOCK_ASSERT(stcb);
11165         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11166                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11167                         /* found a previous ECN_ECHO update it if needed */
11168                         uint32_t cnt, ctsn;
11169
11170                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11171                         ctsn = ntohl(ecne->tsn);
11172                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11173                                 ecne->tsn = htonl(high_tsn);
11174                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11175                         }
11176                         cnt = ntohl(ecne->num_pkts_since_cwr);
11177                         cnt++;
11178                         ecne->num_pkts_since_cwr = htonl(cnt);
11179                         return;
11180                 }
11181         }
11182         /* nope could not find one to update so we must build one */
11183         sctp_alloc_a_chunk(stcb, chk);
11184         if (chk == NULL) {
11185                 return;
11186         }
11187         chk->copy_by_ref = 0;
11188         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11189         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11190         chk->rec.chunk_id.can_take_data = 0;
11191         chk->asoc = &stcb->asoc;
11192         chk->send_size = sizeof(struct sctp_ecne_chunk);
11193         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11194         if (chk->data == NULL) {
11195                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11196                 return;
11197         }
11198         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11199         SCTP_BUF_LEN(chk->data) = chk->send_size;
11200         chk->sent = SCTP_DATAGRAM_UNSENT;
11201         chk->snd_count = 0;
11202         chk->whoTo = net;
11203         atomic_add_int(&chk->whoTo->ref_count, 1);
11204
11205         stcb->asoc.ecn_echo_cnt_onq++;
11206         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11207         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11208         ecne->ch.chunk_flags = 0;
11209         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11210         ecne->tsn = htonl(high_tsn);
11211         ecne->num_pkts_since_cwr = htonl(1);
11212         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11213         asoc->ctrl_queue_cnt++;
11214 }
11215
11216 void
11217 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11218     struct mbuf *m, int iphlen, int bad_crc)
11219 {
11220         struct sctp_association *asoc;
11221         struct sctp_pktdrop_chunk *drp;
11222         struct sctp_tmit_chunk *chk;
11223         uint8_t *datap;
11224         int len;
11225         int was_trunc = 0;
11226         struct ip *iph;
11227
11228 #ifdef INET6
11229         struct ip6_hdr *ip6h;
11230
11231 #endif
11232         int fullsz = 0, extra = 0;
11233         long spc;
11234         int offset;
11235         struct sctp_chunkhdr *ch, chunk_buf;
11236         unsigned int chk_length;
11237
11238         if (!stcb) {
11239                 return;
11240         }
11241         asoc = &stcb->asoc;
11242         SCTP_TCB_LOCK_ASSERT(stcb);
11243         if (asoc->peer_supports_pktdrop == 0) {
11244                 /*-
11245                  * peer must declare support before I send one.
11246                  */
11247                 return;
11248         }
11249         if (stcb->sctp_socket == NULL) {
11250                 return;
11251         }
11252         sctp_alloc_a_chunk(stcb, chk);
11253         if (chk == NULL) {
11254                 return;
11255         }
11256         chk->copy_by_ref = 0;
11257         iph = mtod(m, struct ip *);
11258         if (iph == NULL) {
11259                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11260                 return;
11261         }
11262         switch (iph->ip_v) {
11263 #ifdef INET
11264         case IPVERSION:
11265                 /* IPv4 */
11266                 len = chk->send_size = iph->ip_len;
11267                 break;
11268 #endif
11269 #ifdef INET6
11270         case IPV6_VERSION >> 4:
11271                 /* IPv6 */
11272                 ip6h = mtod(m, struct ip6_hdr *);
11273                 len = chk->send_size = htons(ip6h->ip6_plen);
11274                 break;
11275 #endif
11276         default:
11277                 return;
11278         }
11279         /* Validate that we do not have an ABORT in here. */
11280         offset = iphlen + sizeof(struct sctphdr);
11281         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11282             sizeof(*ch), (uint8_t *) & chunk_buf);
11283         while (ch != NULL) {
11284                 chk_length = ntohs(ch->chunk_length);
11285                 if (chk_length < sizeof(*ch)) {
11286                         /* break to abort land */
11287                         break;
11288                 }
11289                 switch (ch->chunk_type) {
11290                 case SCTP_PACKET_DROPPED:
11291                 case SCTP_ABORT_ASSOCIATION:
11292                 case SCTP_INITIATION_ACK:
11293                         /**
11294                          * We don't respond with an PKT-DROP to an ABORT
11295                          * or PKT-DROP. We also do not respond to an
11296                          * INIT-ACK, because we can't know if the initiation
11297                          * tag is correct or not.
11298                          */
11299                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11300                         return;
11301                 default:
11302                         break;
11303                 }
11304                 offset += SCTP_SIZE32(chk_length);
11305                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11306                     sizeof(*ch), (uint8_t *) & chunk_buf);
11307         }
11308
11309         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11310             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11311                 /*
11312                  * only send 1 mtu worth, trim off the excess on the end.
11313                  */
11314                 fullsz = len - extra;
11315                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11316                 was_trunc = 1;
11317         }
11318         chk->asoc = &stcb->asoc;
11319         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11320         if (chk->data == NULL) {
11321 jump_out:
11322                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11323                 return;
11324         }
11325         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11326         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11327         if (drp == NULL) {
11328                 sctp_m_freem(chk->data);
11329                 chk->data = NULL;
11330                 goto jump_out;
11331         }
11332         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11333             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11334         chk->book_size_scale = 0;
11335         if (was_trunc) {
11336                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11337                 drp->trunc_len = htons(fullsz);
11338                 /*
11339                  * Len is already adjusted to size minus overhead above take
11340                  * out the pkt_drop chunk itself from it.
11341                  */
11342                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11343                 len = chk->send_size;
11344         } else {
11345                 /* no truncation needed */
11346                 drp->ch.chunk_flags = 0;
11347                 drp->trunc_len = htons(0);
11348         }
11349         if (bad_crc) {
11350                 drp->ch.chunk_flags |= SCTP_BADCRC;
11351         }
11352         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11353         SCTP_BUF_LEN(chk->data) = chk->send_size;
11354         chk->sent = SCTP_DATAGRAM_UNSENT;
11355         chk->snd_count = 0;
11356         if (net) {
11357                 /* we should hit here */
11358                 chk->whoTo = net;
11359                 atomic_add_int(&chk->whoTo->ref_count, 1);
11360         } else {
11361                 chk->whoTo = NULL;
11362         }
11363         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11364         chk->rec.chunk_id.can_take_data = 1;
11365         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11366         drp->ch.chunk_length = htons(chk->send_size);
11367         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11368         if (spc < 0) {
11369                 spc = 0;
11370         }
11371         drp->bottle_bw = htonl(spc);
11372         if (asoc->my_rwnd) {
11373                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11374                     asoc->size_on_all_streams +
11375                     asoc->my_rwnd_control_len +
11376                     stcb->sctp_socket->so_rcv.sb_cc);
11377         } else {
11378                 /*-
11379                  * If my rwnd is 0, possibly from mbuf depletion as well as
11380                  * space used, tell the peer there is NO space aka onq == bw
11381                  */
11382                 drp->current_onq = htonl(spc);
11383         }
11384         drp->reserved = 0;
11385         datap = drp->data;
11386         m_copydata(m, iphlen, len, (caddr_t)datap);
11387         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11388         asoc->ctrl_queue_cnt++;
11389 }
11390
11391 void
11392 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11393 {
11394         struct sctp_association *asoc;
11395         struct sctp_cwr_chunk *cwr;
11396         struct sctp_tmit_chunk *chk;
11397
11398         asoc = &stcb->asoc;
11399         SCTP_TCB_LOCK_ASSERT(stcb);
11400         if (net == NULL) {
11401                 return;
11402         }
11403         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11404                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11405                         /*
11406                          * found a previous CWR queued to same destination
11407                          * update it if needed
11408                          */
11409                         uint32_t ctsn;
11410
11411                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11412                         ctsn = ntohl(cwr->tsn);
11413                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11414                                 cwr->tsn = htonl(high_tsn);
11415                         }
11416                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11417                                 /* Make sure override is carried */
11418                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11419                         }
11420                         return;
11421                 }
11422         }
11423         sctp_alloc_a_chunk(stcb, chk);
11424         if (chk == NULL) {
11425                 return;
11426         }
11427         chk->copy_by_ref = 0;
11428         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11429         chk->rec.chunk_id.can_take_data = 1;
11430         chk->asoc = &stcb->asoc;
11431         chk->send_size = sizeof(struct sctp_cwr_chunk);
11432         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11433         if (chk->data == NULL) {
11434                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11435                 return;
11436         }
11437         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11438         SCTP_BUF_LEN(chk->data) = chk->send_size;
11439         chk->sent = SCTP_DATAGRAM_UNSENT;
11440         chk->snd_count = 0;
11441         chk->whoTo = net;
11442         atomic_add_int(&chk->whoTo->ref_count, 1);
11443         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11444         cwr->ch.chunk_type = SCTP_ECN_CWR;
11445         cwr->ch.chunk_flags = override;
11446         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11447         cwr->tsn = htonl(high_tsn);
11448         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11449         asoc->ctrl_queue_cnt++;
11450 }
11451
11452 void
11453 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11454     int number_entries, uint16_t * list,
11455     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11456 {
11457         int len, old_len, i;
11458         struct sctp_stream_reset_out_request *req_out;
11459         struct sctp_chunkhdr *ch;
11460
11461         ch = mtod(chk->data, struct sctp_chunkhdr *);
11462
11463
11464         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11465
11466         /* get to new offset for the param. */
11467         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11468         /* now how long will this param be? */
11469         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11470         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11471         req_out->ph.param_length = htons(len);
11472         req_out->request_seq = htonl(seq);
11473         req_out->response_seq = htonl(resp_seq);
11474         req_out->send_reset_at_tsn = htonl(last_sent);
11475         if (number_entries) {
11476                 for (i = 0; i < number_entries; i++) {
11477                         req_out->list_of_streams[i] = htons(list[i]);
11478                 }
11479         }
11480         if (SCTP_SIZE32(len) > len) {
11481                 /*-
11482                  * Need to worry about the pad we may end up adding to the
11483                  * end. This is easy since the struct is either aligned to 4
11484                  * bytes or 2 bytes off.
11485                  */
11486                 req_out->list_of_streams[number_entries] = 0;
11487         }
11488         /* now fix the chunk length */
11489         ch->chunk_length = htons(len + old_len);
11490         chk->book_size = len + old_len;
11491         chk->book_size_scale = 0;
11492         chk->send_size = SCTP_SIZE32(chk->book_size);
11493         SCTP_BUF_LEN(chk->data) = chk->send_size;
11494         return;
11495 }
11496
11497
11498 void
11499 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11500     int number_entries, uint16_t * list,
11501     uint32_t seq)
11502 {
11503         int len, old_len, i;
11504         struct sctp_stream_reset_in_request *req_in;
11505         struct sctp_chunkhdr *ch;
11506
11507         ch = mtod(chk->data, struct sctp_chunkhdr *);
11508
11509
11510         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11511
11512         /* get to new offset for the param. */
11513         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11514         /* now how long will this param be? */
11515         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11516         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11517         req_in->ph.param_length = htons(len);
11518         req_in->request_seq = htonl(seq);
11519         if (number_entries) {
11520                 for (i = 0; i < number_entries; i++) {
11521                         req_in->list_of_streams[i] = htons(list[i]);
11522                 }
11523         }
11524         if (SCTP_SIZE32(len) > len) {
11525                 /*-
11526                  * Need to worry about the pad we may end up adding to the
11527                  * end. This is easy since the struct is either aligned to 4
11528                  * bytes or 2 bytes off.
11529                  */
11530                 req_in->list_of_streams[number_entries] = 0;
11531         }
11532         /* now fix the chunk length */
11533         ch->chunk_length = htons(len + old_len);
11534         chk->book_size = len + old_len;
11535         chk->book_size_scale = 0;
11536         chk->send_size = SCTP_SIZE32(chk->book_size);
11537         SCTP_BUF_LEN(chk->data) = chk->send_size;
11538         return;
11539 }
11540
11541
11542 void
11543 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11544     uint32_t seq)
11545 {
11546         int len, old_len;
11547         struct sctp_stream_reset_tsn_request *req_tsn;
11548         struct sctp_chunkhdr *ch;
11549
11550         ch = mtod(chk->data, struct sctp_chunkhdr *);
11551
11552
11553         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11554
11555         /* get to new offset for the param. */
11556         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11557         /* now how long will this param be? */
11558         len = sizeof(struct sctp_stream_reset_tsn_request);
11559         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11560         req_tsn->ph.param_length = htons(len);
11561         req_tsn->request_seq = htonl(seq);
11562
11563         /* now fix the chunk length */
11564         ch->chunk_length = htons(len + old_len);
11565         chk->send_size = len + old_len;
11566         chk->book_size = SCTP_SIZE32(chk->send_size);
11567         chk->book_size_scale = 0;
11568         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11569         return;
11570 }
11571
11572 void
11573 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11574     uint32_t resp_seq, uint32_t result)
11575 {
11576         int len, old_len;
11577         struct sctp_stream_reset_response *resp;
11578         struct sctp_chunkhdr *ch;
11579
11580         ch = mtod(chk->data, struct sctp_chunkhdr *);
11581
11582
11583         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11584
11585         /* get to new offset for the param. */
11586         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11587         /* now how long will this param be? */
11588         len = sizeof(struct sctp_stream_reset_response);
11589         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11590         resp->ph.param_length = htons(len);
11591         resp->response_seq = htonl(resp_seq);
11592         resp->result = ntohl(result);
11593
11594         /* now fix the chunk length */
11595         ch->chunk_length = htons(len + old_len);
11596         chk->book_size = len + old_len;
11597         chk->book_size_scale = 0;
11598         chk->send_size = SCTP_SIZE32(chk->book_size);
11599         SCTP_BUF_LEN(chk->data) = chk->send_size;
11600         return;
11601
11602 }
11603
11604
11605 void
11606 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11607     uint32_t resp_seq, uint32_t result,
11608     uint32_t send_una, uint32_t recv_next)
11609 {
11610         int len, old_len;
11611         struct sctp_stream_reset_response_tsn *resp;
11612         struct sctp_chunkhdr *ch;
11613
11614         ch = mtod(chk->data, struct sctp_chunkhdr *);
11615
11616
11617         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11618
11619         /* get to new offset for the param. */
11620         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11621         /* now how long will this param be? */
11622         len = sizeof(struct sctp_stream_reset_response_tsn);
11623         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11624         resp->ph.param_length = htons(len);
11625         resp->response_seq = htonl(resp_seq);
11626         resp->result = htonl(result);
11627         resp->senders_next_tsn = htonl(send_una);
11628         resp->receivers_next_tsn = htonl(recv_next);
11629
11630         /* now fix the chunk length */
11631         ch->chunk_length = htons(len + old_len);
11632         chk->book_size = len + old_len;
11633         chk->send_size = SCTP_SIZE32(chk->book_size);
11634         chk->book_size_scale = 0;
11635         SCTP_BUF_LEN(chk->data) = chk->send_size;
11636         return;
11637 }
11638
11639 static void
11640 sctp_add_a_stream(struct sctp_tmit_chunk *chk,
11641     uint32_t seq,
11642     uint16_t adding)
11643 {
11644         int len, old_len;
11645         struct sctp_chunkhdr *ch;
11646         struct sctp_stream_reset_add_strm *addstr;
11647
11648         ch = mtod(chk->data, struct sctp_chunkhdr *);
11649         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11650
11651         /* get to new offset for the param. */
11652         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11653         /* now how long will this param be? */
11654         len = sizeof(struct sctp_stream_reset_add_strm);
11655
11656         /* Fill it out. */
11657         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_STREAMS);
11658         addstr->ph.param_length = htons(len);
11659         addstr->request_seq = htonl(seq);
11660         addstr->number_of_streams = htons(adding);
11661         addstr->reserved = 0;
11662
11663         /* now fix the chunk length */
11664         ch->chunk_length = htons(len + old_len);
11665         chk->send_size = len + old_len;
11666         chk->book_size = SCTP_SIZE32(chk->send_size);
11667         chk->book_size_scale = 0;
11668         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11669         return;
11670 }
11671
11672 int
11673 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11674     int number_entries, uint16_t * list,
11675     uint8_t send_out_req,
11676     uint32_t resp_seq,
11677     uint8_t send_in_req,
11678     uint8_t send_tsn_req,
11679     uint8_t add_stream,
11680     uint16_t adding
11681 )
11682 {
11683
11684         struct sctp_association *asoc;
11685         struct sctp_tmit_chunk *chk;
11686         struct sctp_chunkhdr *ch;
11687         uint32_t seq;
11688
11689         asoc = &stcb->asoc;
11690         if (asoc->stream_reset_outstanding) {
11691                 /*-
11692                  * Already one pending, must get ACK back to clear the flag.
11693                  */
11694                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11695                 return (EBUSY);
11696         }
11697         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11698             (add_stream == 0)) {
11699                 /* nothing to do */
11700                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11701                 return (EINVAL);
11702         }
11703         if (send_tsn_req && (send_out_req || send_in_req)) {
11704                 /* error, can't do that */
11705                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11706                 return (EINVAL);
11707         }
11708         sctp_alloc_a_chunk(stcb, chk);
11709         if (chk == NULL) {
11710                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11711                 return (ENOMEM);
11712         }
11713         chk->copy_by_ref = 0;
11714         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11715         chk->rec.chunk_id.can_take_data = 0;
11716         chk->asoc = &stcb->asoc;
11717         chk->book_size = sizeof(struct sctp_chunkhdr);
11718         chk->send_size = SCTP_SIZE32(chk->book_size);
11719         chk->book_size_scale = 0;
11720
11721         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11722         if (chk->data == NULL) {
11723                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11724                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11725                 return (ENOMEM);
11726         }
11727         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11728
11729         /* setup chunk parameters */
11730         chk->sent = SCTP_DATAGRAM_UNSENT;
11731         chk->snd_count = 0;
11732         if (stcb->asoc.alternate) {
11733                 chk->whoTo = stcb->asoc.alternate;
11734         } else {
11735                 chk->whoTo = stcb->asoc.primary_destination;
11736         }
11737         atomic_add_int(&chk->whoTo->ref_count, 1);
11738         ch = mtod(chk->data, struct sctp_chunkhdr *);
11739         ch->chunk_type = SCTP_STREAM_RESET;
11740         ch->chunk_flags = 0;
11741         ch->chunk_length = htons(chk->book_size);
11742         SCTP_BUF_LEN(chk->data) = chk->send_size;
11743
11744         seq = stcb->asoc.str_reset_seq_out;
11745         if (send_out_req) {
11746                 sctp_add_stream_reset_out(chk, number_entries, list,
11747                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
11748                 asoc->stream_reset_out_is_outstanding = 1;
11749                 seq++;
11750                 asoc->stream_reset_outstanding++;
11751         }
11752         if (add_stream) {
11753                 sctp_add_a_stream(chk, seq, adding);
11754                 seq++;
11755                 asoc->stream_reset_outstanding++;
11756         }
11757         if (send_in_req) {
11758                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11759                 asoc->stream_reset_outstanding++;
11760         }
11761         if (send_tsn_req) {
11762                 sctp_add_stream_reset_tsn(chk, seq);
11763                 asoc->stream_reset_outstanding++;
11764         }
11765         asoc->str_reset = chk;
11766
11767         /* insert the chunk for sending */
11768         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11769             chk,
11770             sctp_next);
11771         asoc->ctrl_queue_cnt++;
11772         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11773         return (0);
11774 }
11775
11776 void
11777 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11778     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11779 {
11780         /*-
11781          * Formulate the abort message, and send it back down.
11782          */
11783         struct mbuf *o_pak;
11784         struct mbuf *mout;
11785         struct sctp_abort_msg *abm;
11786         struct ip *iph;
11787         struct udphdr *udp;
11788         int iphlen_out, len;
11789
11790 #ifdef INET
11791         struct ip *iph_out;
11792
11793 #endif
11794 #ifdef INET6
11795         struct ip6_hdr *ip6, *ip6_out;
11796
11797 #endif
11798
11799         /* don't respond to ABORT with ABORT */
11800         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11801                 if (err_cause)
11802                         sctp_m_freem(err_cause);
11803                 return;
11804         }
11805         iph = mtod(m, struct ip *);
11806         switch (iph->ip_v) {
11807 #ifdef INET
11808         case IPVERSION:
11809                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11810                 break;
11811 #endif
11812 #ifdef INET6
11813         case IPV6_VERSION >> 4:
11814                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11815                 break;
11816 #endif
11817         default:
11818                 if (err_cause) {
11819                         sctp_m_freem(err_cause);
11820                 }
11821                 return;
11822         }
11823         if (port) {
11824                 len += sizeof(struct udphdr);
11825         }
11826         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11827         if (mout == NULL) {
11828                 if (err_cause) {
11829                         sctp_m_freem(err_cause);
11830                 }
11831                 return;
11832         }
11833         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11834         SCTP_BUF_LEN(mout) = len;
11835         SCTP_BUF_NEXT(mout) = err_cause;
11836         if (m->m_flags & M_FLOWID) {
11837                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11838                 mout->m_flags |= M_FLOWID;
11839         }
11840 #ifdef INET
11841         iph_out = NULL;
11842 #endif
11843 #ifdef INET6
11844         ip6_out = NULL;
11845 #endif
11846         switch (iph->ip_v) {
11847 #ifdef INET
11848         case IPVERSION:
11849                 iph_out = mtod(mout, struct ip *);
11850
11851                 /* Fill in the IP header for the ABORT */
11852                 iph_out->ip_v = IPVERSION;
11853                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11854                 iph_out->ip_tos = (u_char)0;
11855                 iph_out->ip_id = 0;
11856                 iph_out->ip_off = 0;
11857                 iph_out->ip_ttl = MAXTTL;
11858                 if (port) {
11859                         iph_out->ip_p = IPPROTO_UDP;
11860                 } else {
11861                         iph_out->ip_p = IPPROTO_SCTP;
11862                 }
11863                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11864                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11865                 /* let IP layer calculate this */
11866                 iph_out->ip_sum = 0;
11867
11868                 iphlen_out = sizeof(*iph_out);
11869                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
11870                 break;
11871 #endif
11872 #ifdef INET6
11873         case IPV6_VERSION >> 4:
11874                 ip6 = (struct ip6_hdr *)iph;
11875                 ip6_out = mtod(mout, struct ip6_hdr *);
11876
11877                 /* Fill in the IP6 header for the ABORT */
11878                 ip6_out->ip6_flow = ip6->ip6_flow;
11879                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11880                 if (port) {
11881                         ip6_out->ip6_nxt = IPPROTO_UDP;
11882                 } else {
11883                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11884                 }
11885                 ip6_out->ip6_src = ip6->ip6_dst;
11886                 ip6_out->ip6_dst = ip6->ip6_src;
11887
11888                 iphlen_out = sizeof(*ip6_out);
11889                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
11890                 break;
11891 #endif                          /* INET6 */
11892         default:
11893                 /* Currently not supported */
11894                 sctp_m_freem(mout);
11895                 return;
11896         }
11897
11898         udp = (struct udphdr *)abm;
11899         if (port) {
11900                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11901                 udp->uh_dport = port;
11902                 /* set udp->uh_ulen later */
11903                 udp->uh_sum = 0;
11904                 iphlen_out += sizeof(struct udphdr);
11905                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
11906         }
11907         abm->sh.src_port = sh->dest_port;
11908         abm->sh.dest_port = sh->src_port;
11909         abm->sh.checksum = 0;
11910         if (vtag == 0) {
11911                 abm->sh.v_tag = sh->v_tag;
11912                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
11913         } else {
11914                 abm->sh.v_tag = htonl(vtag);
11915                 abm->msg.ch.chunk_flags = 0;
11916         }
11917         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11918
11919         if (err_cause) {
11920                 struct mbuf *m_tmp = err_cause;
11921                 int err_len = 0;
11922
11923                 /* get length of the err_cause chain */
11924                 while (m_tmp != NULL) {
11925                         err_len += SCTP_BUF_LEN(m_tmp);
11926                         m_tmp = SCTP_BUF_NEXT(m_tmp);
11927                 }
11928                 len = SCTP_BUF_LEN(mout) + err_len;
11929                 if (err_len % 4) {
11930                         /* need pad at end of chunk */
11931                         uint32_t cpthis = 0;
11932                         int padlen;
11933
11934                         padlen = 4 - (len % 4);
11935                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
11936                         len += padlen;
11937                 }
11938                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
11939         } else {
11940                 len = SCTP_BUF_LEN(mout);
11941                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
11942         }
11943
11944         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11945                 /* no mbuf's */
11946                 sctp_m_freem(mout);
11947                 return;
11948         }
11949 #ifdef INET
11950         if (iph_out != NULL) {
11951                 sctp_route_t ro;
11952                 int ret;
11953
11954                 /* zap the stack pointer to the route */
11955                 bzero(&ro, sizeof ro);
11956                 if (port) {
11957                         udp->uh_ulen = htons(len - sizeof(struct ip));
11958                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11959                 }
11960                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
11961                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
11962                 /* set IPv4 length */
11963                 iph_out->ip_len = len;
11964                 /* out it goes */
11965 #ifdef  SCTP_PACKET_LOGGING
11966                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11967                         sctp_packet_log(mout, len);
11968 #endif
11969                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
11970                 if (port) {
11971 #if defined(SCTP_WITH_NO_CSUM)
11972                         SCTP_STAT_INCR(sctps_sendnocrc);
11973 #else
11974                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
11975                         SCTP_STAT_INCR(sctps_sendswcrc);
11976 #endif
11977                         SCTP_ENABLE_UDP_CSUM(o_pak);
11978                 } else {
11979 #if defined(SCTP_WITH_NO_CSUM)
11980                         SCTP_STAT_INCR(sctps_sendnocrc);
11981 #else
11982                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11983                         mout->m_pkthdr.csum_data = 0;
11984                         SCTP_STAT_INCR(sctps_sendhwcrc);
11985 #endif
11986                 }
11987                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11988
11989                 /* Free the route if we got one back */
11990                 if (ro.ro_rt)
11991                         RTFREE(ro.ro_rt);
11992         }
11993 #endif
11994 #ifdef INET6
11995         if (ip6_out != NULL) {
11996                 struct route_in6 ro;
11997                 int ret;
11998                 struct ifnet *ifp = NULL;
11999
12000                 /* zap the stack pointer to the route */
12001                 bzero(&ro, sizeof(ro));
12002                 if (port) {
12003                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12004                 }
12005                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
12006                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
12007                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12008 #ifdef  SCTP_PACKET_LOGGING
12009                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12010                         sctp_packet_log(mout, len);
12011 #endif
12012                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12013                 if (port) {
12014 #if defined(SCTP_WITH_NO_CSUM)
12015                         SCTP_STAT_INCR(sctps_sendnocrc);
12016 #else
12017                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12018                         SCTP_STAT_INCR(sctps_sendswcrc);
12019 #endif
12020                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12021                                 udp->uh_sum = 0xffff;
12022                         }
12023                 } else {
12024 #if defined(SCTP_WITH_NO_CSUM)
12025                         SCTP_STAT_INCR(sctps_sendnocrc);
12026 #else
12027                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12028                         mout->m_pkthdr.csum_data = 0;
12029                         SCTP_STAT_INCR(sctps_sendhwcrc);
12030 #endif
12031                 }
12032                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12033
12034                 /* Free the route if we got one back */
12035                 if (ro.ro_rt)
12036                         RTFREE(ro.ro_rt);
12037         }
12038 #endif
12039         SCTP_STAT_INCR(sctps_sendpackets);
12040         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12041         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12042 }
12043
12044 void
12045 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12046     uint32_t vrf_id, uint16_t port)
12047 {
12048         struct mbuf *o_pak;
12049         struct sctphdr *sh, *sh_out;
12050         struct sctp_chunkhdr *ch;
12051         struct ip *iph;
12052         struct udphdr *udp = NULL;
12053         struct mbuf *mout;
12054         int iphlen_out, len;
12055
12056 #ifdef INET
12057         struct ip *iph_out;
12058
12059 #endif
12060 #ifdef INET6
12061         struct ip6_hdr *ip6, *ip6_out;
12062
12063 #endif
12064
12065         iph = mtod(m, struct ip *);
12066         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12067         switch (iph->ip_v) {
12068 #ifdef INET
12069         case IPVERSION:
12070                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12071                 break;
12072 #endif
12073 #ifdef INET6
12074         case IPV6_VERSION >> 4:
12075                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12076                 break;
12077 #endif
12078         default:
12079                 if (scm) {
12080                         sctp_m_freem(scm);
12081                 }
12082                 return;
12083         }
12084         if (port) {
12085                 len += sizeof(struct udphdr);
12086         }
12087         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12088         if (mout == NULL) {
12089                 if (scm) {
12090                         sctp_m_freem(scm);
12091                 }
12092                 return;
12093         }
12094         SCTP_BUF_RESV_UF(mout, max_linkhdr);
12095         SCTP_BUF_LEN(mout) = len;
12096         SCTP_BUF_NEXT(mout) = scm;
12097         if (m->m_flags & M_FLOWID) {
12098                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12099                 mout->m_flags |= M_FLOWID;
12100         }
12101 #ifdef INET
12102         iph_out = NULL;
12103 #endif
12104 #ifdef INET6
12105         ip6_out = NULL;
12106 #endif
12107         switch (iph->ip_v) {
12108 #ifdef INET
12109         case IPVERSION:
12110                 iph_out = mtod(mout, struct ip *);
12111
12112                 /* Fill in the IP header for the ABORT */
12113                 iph_out->ip_v = IPVERSION;
12114                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12115                 iph_out->ip_tos = (u_char)0;
12116                 iph_out->ip_id = 0;
12117                 iph_out->ip_off = 0;
12118                 iph_out->ip_ttl = MAXTTL;
12119                 if (port) {
12120                         iph_out->ip_p = IPPROTO_UDP;
12121                 } else {
12122                         iph_out->ip_p = IPPROTO_SCTP;
12123                 }
12124                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12125                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12126                 /* let IP layer calculate this */
12127                 iph_out->ip_sum = 0;
12128
12129                 iphlen_out = sizeof(struct ip);
12130                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12131                 break;
12132 #endif
12133 #ifdef INET6
12134         case IPV6_VERSION >> 4:
12135                 ip6 = (struct ip6_hdr *)iph;
12136                 ip6_out = mtod(mout, struct ip6_hdr *);
12137
12138                 /* Fill in the IP6 header for the ABORT */
12139                 ip6_out->ip6_flow = ip6->ip6_flow;
12140                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12141                 if (port) {
12142                         ip6_out->ip6_nxt = IPPROTO_UDP;
12143                 } else {
12144                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12145                 }
12146                 ip6_out->ip6_src = ip6->ip6_dst;
12147                 ip6_out->ip6_dst = ip6->ip6_src;
12148
12149                 iphlen_out = sizeof(struct ip6_hdr);
12150                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12151                 break;
12152 #endif                          /* INET6 */
12153         default:
12154                 /* Currently not supported */
12155                 sctp_m_freem(mout);
12156                 return;
12157         }
12158
12159         udp = (struct udphdr *)sh_out;
12160         if (port) {
12161                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12162                 udp->uh_dport = port;
12163                 /* set udp->uh_ulen later */
12164                 udp->uh_sum = 0;
12165                 iphlen_out += sizeof(struct udphdr);
12166                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12167         }
12168         sh_out->src_port = sh->dest_port;
12169         sh_out->dest_port = sh->src_port;
12170         sh_out->v_tag = vtag;
12171         sh_out->checksum = 0;
12172
12173         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12174         ch->chunk_type = SCTP_OPERATION_ERROR;
12175         ch->chunk_flags = 0;
12176
12177         if (scm) {
12178                 struct mbuf *m_tmp = scm;
12179                 int cause_len = 0;
12180
12181                 /* get length of the err_cause chain */
12182                 while (m_tmp != NULL) {
12183                         cause_len += SCTP_BUF_LEN(m_tmp);
12184                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12185                 }
12186                 len = SCTP_BUF_LEN(mout) + cause_len;
12187                 if (cause_len % 4) {
12188                         /* need pad at end of chunk */
12189                         uint32_t cpthis = 0;
12190                         int padlen;
12191
12192                         padlen = 4 - (len % 4);
12193                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12194                         len += padlen;
12195                 }
12196                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12197         } else {
12198                 len = SCTP_BUF_LEN(mout);
12199                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12200         }
12201
12202         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12203                 /* no mbuf's */
12204                 sctp_m_freem(mout);
12205                 return;
12206         }
12207 #ifdef INET
12208         if (iph_out != NULL) {
12209                 sctp_route_t ro;
12210                 int ret;
12211
12212                 /* zap the stack pointer to the route */
12213                 bzero(&ro, sizeof ro);
12214                 if (port) {
12215                         udp->uh_ulen = htons(len - sizeof(struct ip));
12216                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12217                 }
12218                 /* set IPv4 length */
12219                 iph_out->ip_len = len;
12220                 /* out it goes */
12221 #ifdef  SCTP_PACKET_LOGGING
12222                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12223                         sctp_packet_log(mout, len);
12224 #endif
12225                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12226                 if (port) {
12227 #if defined(SCTP_WITH_NO_CSUM)
12228                         SCTP_STAT_INCR(sctps_sendnocrc);
12229 #else
12230                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12231                         SCTP_STAT_INCR(sctps_sendswcrc);
12232 #endif
12233                         SCTP_ENABLE_UDP_CSUM(o_pak);
12234                 } else {
12235 #if defined(SCTP_WITH_NO_CSUM)
12236                         SCTP_STAT_INCR(sctps_sendnocrc);
12237 #else
12238                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12239                         mout->m_pkthdr.csum_data = 0;
12240                         SCTP_STAT_INCR(sctps_sendhwcrc);
12241 #endif
12242                 }
12243                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12244
12245                 /* Free the route if we got one back */
12246                 if (ro.ro_rt)
12247                         RTFREE(ro.ro_rt);
12248         }
12249 #endif
12250 #ifdef INET6
12251         if (ip6_out != NULL) {
12252                 struct route_in6 ro;
12253                 int ret;
12254                 struct ifnet *ifp = NULL;
12255
12256                 /* zap the stack pointer to the route */
12257                 bzero(&ro, sizeof(ro));
12258                 if (port) {
12259                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12260                 }
12261                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12262 #ifdef  SCTP_PACKET_LOGGING
12263                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12264                         sctp_packet_log(mout, len);
12265 #endif
12266                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12267                 if (port) {
12268 #if defined(SCTP_WITH_NO_CSUM)
12269                         SCTP_STAT_INCR(sctps_sendnocrc);
12270 #else
12271                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12272                         SCTP_STAT_INCR(sctps_sendswcrc);
12273 #endif
12274                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12275                                 udp->uh_sum = 0xffff;
12276                         }
12277                 } else {
12278 #if defined(SCTP_WITH_NO_CSUM)
12279                         SCTP_STAT_INCR(sctps_sendnocrc);
12280 #else
12281                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12282                         mout->m_pkthdr.csum_data = 0;
12283                         SCTP_STAT_INCR(sctps_sendhwcrc);
12284 #endif
12285                 }
12286                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12287
12288                 /* Free the route if we got one back */
12289                 if (ro.ro_rt)
12290                         RTFREE(ro.ro_rt);
12291         }
12292 #endif
12293         SCTP_STAT_INCR(sctps_sendpackets);
12294         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12295         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12296 }
12297
12298 static struct mbuf *
12299 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
12300     struct uio *uio,
12301     struct sctp_sndrcvinfo *srcv,
12302     int max_send_len,
12303     int user_marks_eor,
12304     int *error,
12305     uint32_t * sndout,
12306     struct mbuf **new_tail)
12307 {
12308         struct mbuf *m;
12309
12310         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12311             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12312         if (m == NULL) {
12313                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12314                 *error = ENOMEM;
12315         } else {
12316                 *sndout = m_length(m, NULL);
12317                 *new_tail = m_last(m);
12318         }
12319         return (m);
12320 }
12321
12322 static int
12323 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12324     struct uio *uio,
12325     int resv_upfront)
12326 {
12327         int left;
12328
12329         left = sp->length;
12330         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12331             resv_upfront, 0);
12332         if (sp->data == NULL) {
12333                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12334                 return (ENOMEM);
12335         }
12336         sp->tail_mbuf = m_last(sp->data);
12337         return (0);
12338 }
12339
12340
12341
12342 static struct sctp_stream_queue_pending *
12343 sctp_copy_it_in(struct sctp_tcb *stcb,
12344     struct sctp_association *asoc,
12345     struct sctp_sndrcvinfo *srcv,
12346     struct uio *uio,
12347     struct sctp_nets *net,
12348     int max_send_len,
12349     int user_marks_eor,
12350     int *error,
12351     int non_blocking)
12352 {
12353         /*-
12354          * This routine must be very careful in its work. Protocol
12355          * processing is up and running so care must be taken to spl...()
12356          * when you need to do something that may effect the stcb/asoc. The
12357          * sb is locked however. When data is copied the protocol processing
12358          * should be enabled since this is a slower operation...
12359          */
12360         struct sctp_stream_queue_pending *sp = NULL;
12361         int resv_in_first;
12362
12363         *error = 0;
12364         /* Now can we send this? */
12365         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12366             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12367             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12368             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12369                 /* got data while shutting down */
12370                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12371                 *error = ECONNRESET;
12372                 goto out_now;
12373         }
12374         sctp_alloc_a_strmoq(stcb, sp);
12375         if (sp == NULL) {
12376                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12377                 *error = ENOMEM;
12378                 goto out_now;
12379         }
12380         sp->act_flags = 0;
12381         sp->sender_all_done = 0;
12382         sp->sinfo_flags = srcv->sinfo_flags;
12383         sp->timetolive = srcv->sinfo_timetolive;
12384         sp->ppid = srcv->sinfo_ppid;
12385         sp->context = srcv->sinfo_context;
12386         sp->strseq = 0;
12387         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12388
12389         sp->stream = srcv->sinfo_stream;
12390         sp->length = min(uio->uio_resid, max_send_len);
12391         if ((sp->length == (uint32_t) uio->uio_resid) &&
12392             ((user_marks_eor == 0) ||
12393             (srcv->sinfo_flags & SCTP_EOF) ||
12394             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12395                 sp->msg_is_complete = 1;
12396         } else {
12397                 sp->msg_is_complete = 0;
12398         }
12399         sp->sender_all_done = 0;
12400         sp->some_taken = 0;
12401         sp->put_last_out = 0;
12402         resv_in_first = sizeof(struct sctp_data_chunk);
12403         sp->data = sp->tail_mbuf = NULL;
12404         if (sp->length == 0) {
12405                 *error = 0;
12406                 goto skip_copy;
12407         }
12408         if (srcv->sinfo_keynumber_valid) {
12409                 sp->auth_keyid = srcv->sinfo_keynumber;
12410         } else {
12411                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12412         }
12413         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12414                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12415                 sp->holds_key_ref = 1;
12416         }
12417         *error = sctp_copy_one(sp, uio, resv_in_first);
12418 skip_copy:
12419         if (*error) {
12420                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12421                 sp = NULL;
12422         } else {
12423                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12424                         sp->net = net;
12425                         atomic_add_int(&sp->net->ref_count, 1);
12426                 } else {
12427                         sp->net = NULL;
12428                 }
12429                 sctp_set_prsctp_policy(sp);
12430         }
12431 out_now:
12432         return (sp);
12433 }
12434
12435
12436 int
12437 sctp_sosend(struct socket *so,
12438     struct sockaddr *addr,
12439     struct uio *uio,
12440     struct mbuf *top,
12441     struct mbuf *control,
12442     int flags,
12443     struct thread *p
12444 )
12445 {
12446         int error, use_sndinfo = 0;
12447         struct sctp_sndrcvinfo sndrcvninfo;
12448         struct sockaddr *addr_to_use;
12449
12450 #if defined(INET) && defined(INET6)
12451         struct sockaddr_in sin;
12452
12453 #endif
12454
12455         if (control) {
12456                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12457                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12458                     sizeof(sndrcvninfo))) {
12459                         /* got one */
12460                         use_sndinfo = 1;
12461                 }
12462         }
12463         addr_to_use = addr;
12464 #if defined(INET) && defined(INET6)
12465         if ((addr) && (addr->sa_family == AF_INET6)) {
12466                 struct sockaddr_in6 *sin6;
12467
12468                 sin6 = (struct sockaddr_in6 *)addr;
12469                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12470                         in6_sin6_2_sin(&sin, sin6);
12471                         addr_to_use = (struct sockaddr *)&sin;
12472                 }
12473         }
12474 #endif
12475         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12476             control,
12477             flags,
12478             use_sndinfo ? &sndrcvninfo : NULL
12479             ,p
12480             );
12481         return (error);
12482 }
12483
12484
12485 int
12486 sctp_lower_sosend(struct socket *so,
12487     struct sockaddr *addr,
12488     struct uio *uio,
12489     struct mbuf *i_pak,
12490     struct mbuf *control,
12491     int flags,
12492     struct sctp_sndrcvinfo *srcv
12493     ,
12494     struct thread *p
12495 )
12496 {
12497         unsigned int sndlen = 0, max_len;
12498         int error, len;
12499         struct mbuf *top = NULL;
12500         int queue_only = 0, queue_only_for_init = 0;
12501         int free_cnt_applied = 0;
12502         int un_sent;
12503         int now_filled = 0;
12504         unsigned int inqueue_bytes = 0;
12505         struct sctp_block_entry be;
12506         struct sctp_inpcb *inp;
12507         struct sctp_tcb *stcb = NULL;
12508         struct timeval now;
12509         struct sctp_nets *net;
12510         struct sctp_association *asoc;
12511         struct sctp_inpcb *t_inp;
12512         int user_marks_eor;
12513         int create_lock_applied = 0;
12514         int nagle_applies = 0;
12515         int some_on_control = 0;
12516         int got_all_of_the_send = 0;
12517         int hold_tcblock = 0;
12518         int non_blocking = 0;
12519         uint32_t local_add_more, local_soresv = 0;
12520         uint16_t port;
12521         uint16_t sinfo_flags;
12522         sctp_assoc_t sinfo_assoc_id;
12523
12524         error = 0;
12525         net = NULL;
12526         stcb = NULL;
12527         asoc = NULL;
12528
12529         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12530         if (inp == NULL) {
12531                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12532                 error = EINVAL;
12533                 if (i_pak) {
12534                         SCTP_RELEASE_PKT(i_pak);
12535                 }
12536                 return (error);
12537         }
12538         if ((uio == NULL) && (i_pak == NULL)) {
12539                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12540                 return (EINVAL);
12541         }
12542         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12543         atomic_add_int(&inp->total_sends, 1);
12544         if (uio) {
12545                 if (uio->uio_resid < 0) {
12546                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12547                         return (EINVAL);
12548                 }
12549                 sndlen = uio->uio_resid;
12550         } else {
12551                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12552                 sndlen = SCTP_HEADER_LEN(i_pak);
12553         }
12554         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12555             addr,
12556             sndlen);
12557         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12558             (inp->sctp_socket->so_qlimit)) {
12559                 /* The listener can NOT send */
12560                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12561                 error = ENOTCONN;
12562                 goto out_unlocked;
12563         }
12564         /**
12565          * Pre-screen address, if one is given the sin-len
12566          * must be set correctly!
12567          */
12568         if (addr) {
12569                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12570
12571                 switch (raddr->sa.sa_family) {
12572 #if defined(INET)
12573                 case AF_INET:
12574                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12575                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12576                                 error = EINVAL;
12577                                 goto out_unlocked;
12578                         }
12579                         port = raddr->sin.sin_port;
12580                         break;
12581 #endif
12582 #if defined(INET6)
12583                 case AF_INET6:
12584                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12585                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12586                                 error = EINVAL;
12587                                 goto out_unlocked;
12588                         }
12589                         port = raddr->sin6.sin6_port;
12590                         break;
12591 #endif
12592                 default:
12593                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12594                         error = EAFNOSUPPORT;
12595                         goto out_unlocked;
12596                 }
12597         } else
12598                 port = 0;
12599
12600         if (srcv) {
12601                 sinfo_flags = srcv->sinfo_flags;
12602                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12603                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12604                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12605                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                         error = EINVAL;
12607                         goto out_unlocked;
12608                 }
12609                 if (srcv->sinfo_flags)
12610                         SCTP_STAT_INCR(sctps_sends_with_flags);
12611         } else {
12612                 sinfo_flags = inp->def_send.sinfo_flags;
12613                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12614         }
12615         if (sinfo_flags & SCTP_SENDALL) {
12616                 /* its a sendall */
12617                 error = sctp_sendall(inp, uio, top, srcv);
12618                 top = NULL;
12619                 goto out_unlocked;
12620         }
12621         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12622                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12623                 error = EINVAL;
12624                 goto out_unlocked;
12625         }
12626         /* now we must find the assoc */
12627         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12628             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12629                 SCTP_INP_RLOCK(inp);
12630                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12631                 if (stcb) {
12632                         SCTP_TCB_LOCK(stcb);
12633                         hold_tcblock = 1;
12634                 }
12635                 SCTP_INP_RUNLOCK(inp);
12636         } else if (sinfo_assoc_id) {
12637                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12638         } else if (addr) {
12639                 /*-
12640                  * Since we did not use findep we must
12641                  * increment it, and if we don't find a tcb
12642                  * decrement it.
12643                  */
12644                 SCTP_INP_WLOCK(inp);
12645                 SCTP_INP_INCR_REF(inp);
12646                 SCTP_INP_WUNLOCK(inp);
12647                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12648                 if (stcb == NULL) {
12649                         SCTP_INP_WLOCK(inp);
12650                         SCTP_INP_DECR_REF(inp);
12651                         SCTP_INP_WUNLOCK(inp);
12652                 } else {
12653                         hold_tcblock = 1;
12654                 }
12655         }
12656         if ((stcb == NULL) && (addr)) {
12657                 /* Possible implicit send? */
12658                 SCTP_ASOC_CREATE_LOCK(inp);
12659                 create_lock_applied = 1;
12660                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12661                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12662                         /* Should I really unlock ? */
12663                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12664                         error = EINVAL;
12665                         goto out_unlocked;
12666
12667                 }
12668                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12669                     (addr->sa_family == AF_INET6)) {
12670                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12671                         error = EINVAL;
12672                         goto out_unlocked;
12673                 }
12674                 SCTP_INP_WLOCK(inp);
12675                 SCTP_INP_INCR_REF(inp);
12676                 SCTP_INP_WUNLOCK(inp);
12677                 /* With the lock applied look again */
12678                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12679                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12680                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12681                 }
12682                 if (stcb == NULL) {
12683                         SCTP_INP_WLOCK(inp);
12684                         SCTP_INP_DECR_REF(inp);
12685                         SCTP_INP_WUNLOCK(inp);
12686                 } else {
12687                         hold_tcblock = 1;
12688                 }
12689                 if (error) {
12690                         goto out_unlocked;
12691                 }
12692                 if (t_inp != inp) {
12693                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12694                         error = ENOTCONN;
12695                         goto out_unlocked;
12696                 }
12697         }
12698         if (stcb == NULL) {
12699                 if (addr == NULL) {
12700                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12701                         error = ENOENT;
12702                         goto out_unlocked;
12703                 } else {
12704                         /* We must go ahead and start the INIT process */
12705                         uint32_t vrf_id;
12706
12707                         if ((sinfo_flags & SCTP_ABORT) ||
12708                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12709                                 /*-
12710                                  * User asks to abort a non-existant assoc,
12711                                  * or EOF a non-existant assoc with no data
12712                                  */
12713                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12714                                 error = ENOENT;
12715                                 goto out_unlocked;
12716                         }
12717                         /* get an asoc/stcb struct */
12718                         vrf_id = inp->def_vrf_id;
12719 #ifdef INVARIANTS
12720                         if (create_lock_applied == 0) {
12721                                 panic("Error, should hold create lock and I don't?");
12722                         }
12723 #endif
12724                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12725                             p
12726                             );
12727                         if (stcb == NULL) {
12728                                 /* Error is setup for us in the call */
12729                                 goto out_unlocked;
12730                         }
12731                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12732                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12733                                 /*
12734                                  * Set the connected flag so we can queue
12735                                  * data
12736                                  */
12737                                 soisconnecting(so);
12738                         }
12739                         hold_tcblock = 1;
12740                         if (create_lock_applied) {
12741                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12742                                 create_lock_applied = 0;
12743                         } else {
12744                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12745                         }
12746                         /*
12747                          * Turn on queue only flag to prevent data from
12748                          * being sent
12749                          */
12750                         queue_only = 1;
12751                         asoc = &stcb->asoc;
12752                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12753                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12754
12755                         /* initialize authentication params for the assoc */
12756                         sctp_initialize_auth_params(inp, stcb);
12757
12758                         if (control) {
12759                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12760                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12761                                         hold_tcblock = 0;
12762                                         stcb = NULL;
12763                                         goto out_unlocked;
12764                                 }
12765                         }
12766                         /* out with the INIT */
12767                         queue_only_for_init = 1;
12768                         /*-
12769                          * we may want to dig in after this call and adjust the MTU
12770                          * value. It defaulted to 1500 (constant) but the ro
12771                          * structure may now have an update and thus we may need to
12772                          * change it BEFORE we append the message.
12773                          */
12774                 }
12775         } else
12776                 asoc = &stcb->asoc;
12777         if (srcv == NULL)
12778                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12779         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12780                 if (addr)
12781                         net = sctp_findnet(stcb, addr);
12782                 else
12783                         net = NULL;
12784                 if ((net == NULL) ||
12785                     ((port != 0) && (port != stcb->rport))) {
12786                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12787                         error = EINVAL;
12788                         goto out_unlocked;
12789                 }
12790         } else {
12791                 if (stcb->asoc.alternate) {
12792                         net = stcb->asoc.alternate;
12793                 } else {
12794                         net = stcb->asoc.primary_destination;
12795                 }
12796         }
12797         atomic_add_int(&stcb->total_sends, 1);
12798         /* Keep the stcb from being freed under our feet */
12799         atomic_add_int(&asoc->refcnt, 1);
12800         free_cnt_applied = 1;
12801
12802         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12803                 if (sndlen > asoc->smallest_mtu) {
12804                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12805                         error = EMSGSIZE;
12806                         goto out_unlocked;
12807                 }
12808         }
12809         if ((SCTP_SO_IS_NBIO(so)
12810             || (flags & MSG_NBIO)
12811             )) {
12812                 non_blocking = 1;
12813         }
12814         /* would we block? */
12815         if (non_blocking) {
12816                 if (hold_tcblock == 0) {
12817                         SCTP_TCB_LOCK(stcb);
12818                         hold_tcblock = 1;
12819                 }
12820                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12821                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12822                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12823                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12824                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12825                                 error = EMSGSIZE;
12826                         else
12827                                 error = EWOULDBLOCK;
12828                         goto out_unlocked;
12829                 }
12830                 stcb->asoc.sb_send_resv += sndlen;
12831                 SCTP_TCB_UNLOCK(stcb);
12832                 hold_tcblock = 0;
12833         } else {
12834                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12835         }
12836         local_soresv = sndlen;
12837         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12838                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12839                 error = ECONNRESET;
12840                 goto out_unlocked;
12841         }
12842         if (create_lock_applied) {
12843                 SCTP_ASOC_CREATE_UNLOCK(inp);
12844                 create_lock_applied = 0;
12845         }
12846         if (asoc->stream_reset_outstanding) {
12847                 /*
12848                  * Can't queue any data while stream reset is underway.
12849                  */
12850                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12851                 error = EAGAIN;
12852                 goto out_unlocked;
12853         }
12854         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12855             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12856                 queue_only = 1;
12857         }
12858         /* we are now done with all control */
12859         if (control) {
12860                 sctp_m_freem(control);
12861                 control = NULL;
12862         }
12863         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12864             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12865             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12866             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12867                 if (srcv->sinfo_flags & SCTP_ABORT) {
12868                         ;
12869                 } else {
12870                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12871                         error = ECONNRESET;
12872                         goto out_unlocked;
12873                 }
12874         }
12875         /* Ok, we will attempt a msgsnd :> */
12876         if (p) {
12877                 p->td_ru.ru_msgsnd++;
12878         }
12879         /* Are we aborting? */
12880         if (srcv->sinfo_flags & SCTP_ABORT) {
12881                 struct mbuf *mm;
12882                 int tot_demand, tot_out = 0, max_out;
12883
12884                 SCTP_STAT_INCR(sctps_sends_with_abort);
12885                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12886                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12887                         /* It has to be up before we abort */
12888                         /* how big is the user initiated abort? */
12889                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12890                         error = EINVAL;
12891                         goto out;
12892                 }
12893                 if (hold_tcblock) {
12894                         SCTP_TCB_UNLOCK(stcb);
12895                         hold_tcblock = 0;
12896                 }
12897                 if (top) {
12898                         struct mbuf *cntm = NULL;
12899
12900                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
12901                         if (sndlen != 0) {
12902                                 cntm = top;
12903                                 while (cntm) {
12904                                         tot_out += SCTP_BUF_LEN(cntm);
12905                                         cntm = SCTP_BUF_NEXT(cntm);
12906                                 }
12907                         }
12908                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12909                 } else {
12910                         /* Must fit in a MTU */
12911                         tot_out = sndlen;
12912                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12913                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12914                                 /* To big */
12915                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12916                                 error = EMSGSIZE;
12917                                 goto out;
12918                         }
12919                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12920                 }
12921                 if (mm == NULL) {
12922                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12923                         error = ENOMEM;
12924                         goto out;
12925                 }
12926                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12927                 max_out -= sizeof(struct sctp_abort_msg);
12928                 if (tot_out > max_out) {
12929                         tot_out = max_out;
12930                 }
12931                 if (mm) {
12932                         struct sctp_paramhdr *ph;
12933
12934                         /* now move forward the data pointer */
12935                         ph = mtod(mm, struct sctp_paramhdr *);
12936                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12937                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12938                         ph++;
12939                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12940                         if (top == NULL) {
12941                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12942                                 if (error) {
12943                                         /*-
12944                                          * Here if we can't get his data we
12945                                          * still abort we just don't get to
12946                                          * send the users note :-0
12947                                          */
12948                                         sctp_m_freem(mm);
12949                                         mm = NULL;
12950                                 }
12951                         } else {
12952                                 if (sndlen != 0) {
12953                                         SCTP_BUF_NEXT(mm) = top;
12954                                 }
12955                         }
12956                 }
12957                 if (hold_tcblock == 0) {
12958                         SCTP_TCB_LOCK(stcb);
12959                         hold_tcblock = 1;
12960                 }
12961                 atomic_add_int(&stcb->asoc.refcnt, -1);
12962                 free_cnt_applied = 0;
12963                 /* release this lock, otherwise we hang on ourselves */
12964                 sctp_abort_an_association(stcb->sctp_ep, stcb,
12965                     SCTP_RESPONSE_TO_USER_REQ,
12966                     mm, SCTP_SO_LOCKED);
12967                 /* now relock the stcb so everything is sane */
12968                 hold_tcblock = 0;
12969                 stcb = NULL;
12970                 /*
12971                  * In this case top is already chained to mm avoid double
12972                  * free, since we free it below if top != NULL and driver
12973                  * would free it after sending the packet out
12974                  */
12975                 if (sndlen != 0) {
12976                         top = NULL;
12977                 }
12978                 goto out_unlocked;
12979         }
12980         /* Calculate the maximum we can send */
12981         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12982         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12983                 if (non_blocking) {
12984                         /* we already checked for non-blocking above. */
12985                         max_len = sndlen;
12986                 } else {
12987                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12988                 }
12989         } else {
12990                 max_len = 0;
12991         }
12992         if (hold_tcblock) {
12993                 SCTP_TCB_UNLOCK(stcb);
12994                 hold_tcblock = 0;
12995         }
12996         /* Is the stream no. valid? */
12997         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12998                 /* Invalid stream number */
12999                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13000                 error = EINVAL;
13001                 goto out_unlocked;
13002         }
13003         if (asoc->strmout == NULL) {
13004                 /* huh? software error */
13005                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13006                 error = EFAULT;
13007                 goto out_unlocked;
13008         }
13009         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13010         if ((user_marks_eor == 0) &&
13011             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13012                 /* It will NEVER fit */
13013                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13014                 error = EMSGSIZE;
13015                 goto out_unlocked;
13016         }
13017         if ((uio == NULL) && user_marks_eor) {
13018                 /*-
13019                  * We do not support eeor mode for
13020                  * sending with mbuf chains (like sendfile).
13021                  */
13022                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13023                 error = EINVAL;
13024                 goto out_unlocked;
13025         }
13026         if (user_marks_eor) {
13027                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13028         } else {
13029                 /*-
13030                  * For non-eeor the whole message must fit in
13031                  * the socket send buffer.
13032                  */
13033                 local_add_more = sndlen;
13034         }
13035         len = 0;
13036         if (non_blocking) {
13037                 goto skip_preblock;
13038         }
13039         if (((max_len <= local_add_more) &&
13040             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13041             (max_len == 0) ||
13042             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13043                 /* No room right now ! */
13044                 SOCKBUF_LOCK(&so->so_snd);
13045                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13046                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13047                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13048                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13049                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13050                             inqueue_bytes,
13051                             local_add_more,
13052                             stcb->asoc.stream_queue_cnt,
13053                             stcb->asoc.chunks_on_out_queue,
13054                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13055                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13056                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
13057                         }
13058                         be.error = 0;
13059                         stcb->block_entry = &be;
13060                         error = sbwait(&so->so_snd);
13061                         stcb->block_entry = NULL;
13062                         if (error || so->so_error || be.error) {
13063                                 if (error == 0) {
13064                                         if (so->so_error)
13065                                                 error = so->so_error;
13066                                         if (be.error) {
13067                                                 error = be.error;
13068                                         }
13069                                 }
13070                                 SOCKBUF_UNLOCK(&so->so_snd);
13071                                 goto out_unlocked;
13072                         }
13073                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13074                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13075                                     so, asoc, stcb->asoc.total_output_queue_size);
13076                         }
13077                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13078                                 goto out_unlocked;
13079                         }
13080                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13081                 }
13082                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13083                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13084                 } else {
13085                         max_len = 0;
13086                 }
13087                 SOCKBUF_UNLOCK(&so->so_snd);
13088         }
13089 skip_preblock:
13090         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13091                 goto out_unlocked;
13092         }
13093         /*
13094          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13095          * case NOTE: uio will be null when top/mbuf is passed
13096          */
13097         if (sndlen == 0) {
13098                 if (srcv->sinfo_flags & SCTP_EOF) {
13099                         got_all_of_the_send = 1;
13100                         goto dataless_eof;
13101                 } else {
13102                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13103                         error = EINVAL;
13104                         goto out;
13105                 }
13106         }
13107         if (top == NULL) {
13108                 struct sctp_stream_queue_pending *sp;
13109                 struct sctp_stream_out *strm;
13110                 uint32_t sndout;
13111
13112                 SCTP_TCB_SEND_LOCK(stcb);
13113                 if ((asoc->stream_locked) &&
13114                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13115                         SCTP_TCB_SEND_UNLOCK(stcb);
13116                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13117                         error = EINVAL;
13118                         goto out;
13119                 }
13120                 SCTP_TCB_SEND_UNLOCK(stcb);
13121
13122                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13123                 if (strm->last_msg_incomplete == 0) {
13124         do_a_copy_in:
13125                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
13126                         if ((sp == NULL) || (error)) {
13127                                 goto out;
13128                         }
13129                         SCTP_TCB_SEND_LOCK(stcb);
13130                         if (sp->msg_is_complete) {
13131                                 strm->last_msg_incomplete = 0;
13132                                 asoc->stream_locked = 0;
13133                         } else {
13134                                 /*
13135                                  * Just got locked to this guy in case of an
13136                                  * interrupt.
13137                                  */
13138                                 strm->last_msg_incomplete = 1;
13139                                 asoc->stream_locked = 1;
13140                                 asoc->stream_locked_on = srcv->sinfo_stream;
13141                                 sp->sender_all_done = 0;
13142                         }
13143                         sctp_snd_sb_alloc(stcb, sp->length);
13144                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13145                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13146                                 sp->strseq = strm->next_sequence_sent;
13147                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13148                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13149                                             (uintptr_t) stcb, sp->length,
13150                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13151                                 }
13152                                 strm->next_sequence_sent++;
13153                         } else {
13154                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13155                         }
13156                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13157                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13158                         SCTP_TCB_SEND_UNLOCK(stcb);
13159                 } else {
13160                         SCTP_TCB_SEND_LOCK(stcb);
13161                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13162                         SCTP_TCB_SEND_UNLOCK(stcb);
13163                         if (sp == NULL) {
13164                                 /* ???? Huh ??? last msg is gone */
13165 #ifdef INVARIANTS
13166                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13167 #else
13168                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13169                                 strm->last_msg_incomplete = 0;
13170 #endif
13171                                 goto do_a_copy_in;
13172
13173                         }
13174                 }
13175                 while (uio->uio_resid > 0) {
13176                         /* How much room do we have? */
13177                         struct mbuf *new_tail, *mm;
13178
13179                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13180                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13181                         else
13182                                 max_len = 0;
13183
13184                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13185                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13186                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13187                                 sndout = 0;
13188                                 new_tail = NULL;
13189                                 if (hold_tcblock) {
13190                                         SCTP_TCB_UNLOCK(stcb);
13191                                         hold_tcblock = 0;
13192                                 }
13193                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
13194                                 if ((mm == NULL) || error) {
13195                                         if (mm) {
13196                                                 sctp_m_freem(mm);
13197                                         }
13198                                         goto out;
13199                                 }
13200                                 /* Update the mbuf and count */
13201                                 SCTP_TCB_SEND_LOCK(stcb);
13202                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13203                                         /*
13204                                          * we need to get out. Peer probably
13205                                          * aborted.
13206                                          */
13207                                         sctp_m_freem(mm);
13208                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13209                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13210                                                 error = ECONNRESET;
13211                                         }
13212                                         SCTP_TCB_SEND_UNLOCK(stcb);
13213                                         goto out;
13214                                 }
13215                                 if (sp->tail_mbuf) {
13216                                         /* tack it to the end */
13217                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13218                                         sp->tail_mbuf = new_tail;
13219                                 } else {
13220                                         /* A stolen mbuf */
13221                                         sp->data = mm;
13222                                         sp->tail_mbuf = new_tail;
13223                                 }
13224                                 sctp_snd_sb_alloc(stcb, sndout);
13225                                 atomic_add_int(&sp->length, sndout);
13226                                 len += sndout;
13227
13228                                 /* Did we reach EOR? */
13229                                 if ((uio->uio_resid == 0) &&
13230                                     ((user_marks_eor == 0) ||
13231                                     (srcv->sinfo_flags & SCTP_EOF) ||
13232                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13233                                         sp->msg_is_complete = 1;
13234                                 } else {
13235                                         sp->msg_is_complete = 0;
13236                                 }
13237                                 SCTP_TCB_SEND_UNLOCK(stcb);
13238                         }
13239                         if (uio->uio_resid == 0) {
13240                                 /* got it all? */
13241                                 continue;
13242                         }
13243                         /* PR-SCTP? */
13244                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13245                                 /*
13246                                  * This is ugly but we must assure locking
13247                                  * order
13248                                  */
13249                                 if (hold_tcblock == 0) {
13250                                         SCTP_TCB_LOCK(stcb);
13251                                         hold_tcblock = 1;
13252                                 }
13253                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13254                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13255                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13256                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13257                                 else
13258                                         max_len = 0;
13259                                 if (max_len > 0) {
13260                                         continue;
13261                                 }
13262                                 SCTP_TCB_UNLOCK(stcb);
13263                                 hold_tcblock = 0;
13264                         }
13265                         /* wait for space now */
13266                         if (non_blocking) {
13267                                 /* Non-blocking io in place out */
13268                                 goto skip_out_eof;
13269                         }
13270                         /* What about the INIT, send it maybe */
13271                         if (queue_only_for_init) {
13272                                 if (hold_tcblock == 0) {
13273                                         SCTP_TCB_LOCK(stcb);
13274                                         hold_tcblock = 1;
13275                                 }
13276                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13277                                         /* a collision took us forward? */
13278                                         queue_only = 0;
13279                                 } else {
13280                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13281                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13282                                         queue_only = 1;
13283                                 }
13284                         }
13285                         if ((net->flight_size > net->cwnd) &&
13286                             (asoc->sctp_cmt_on_off == 0)) {
13287                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13288                                 queue_only = 1;
13289                         } else if (asoc->ifp_had_enobuf) {
13290                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13291                                 if (net->flight_size > (2 * net->mtu)) {
13292                                         queue_only = 1;
13293                                 }
13294                                 asoc->ifp_had_enobuf = 0;
13295                         }
13296                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13297                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13298                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13299                             (stcb->asoc.total_flight > 0) &&
13300                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13301                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13302
13303                                 /*-
13304                                  * Ok, Nagle is set on and we have data outstanding.
13305                                  * Don't send anything and let SACKs drive out the
13306                                  * data unless wen have a "full" segment to send.
13307                                  */
13308                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13309                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13310                                 }
13311                                 SCTP_STAT_INCR(sctps_naglequeued);
13312                                 nagle_applies = 1;
13313                         } else {
13314                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13315                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13316                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13317                                 }
13318                                 SCTP_STAT_INCR(sctps_naglesent);
13319                                 nagle_applies = 0;
13320                         }
13321                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13322
13323                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13324                                     nagle_applies, un_sent);
13325                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13326                                     stcb->asoc.total_flight,
13327                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13328                         }
13329                         if (queue_only_for_init)
13330                                 queue_only_for_init = 0;
13331                         if ((queue_only == 0) && (nagle_applies == 0)) {
13332                                 /*-
13333                                  * need to start chunk output
13334                                  * before blocking.. note that if
13335                                  * a lock is already applied, then
13336                                  * the input via the net is happening
13337                                  * and I don't need to start output :-D
13338                                  */
13339                                 if (hold_tcblock == 0) {
13340                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13341                                                 hold_tcblock = 1;
13342                                                 sctp_chunk_output(inp,
13343                                                     stcb,
13344                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13345                                         }
13346                                 } else {
13347                                         sctp_chunk_output(inp,
13348                                             stcb,
13349                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13350                                 }
13351                                 if (hold_tcblock == 1) {
13352                                         SCTP_TCB_UNLOCK(stcb);
13353                                         hold_tcblock = 0;
13354                                 }
13355                         }
13356                         SOCKBUF_LOCK(&so->so_snd);
13357                         /*-
13358                          * This is a bit strange, but I think it will
13359                          * work. The total_output_queue_size is locked and
13360                          * protected by the TCB_LOCK, which we just released.
13361                          * There is a race that can occur between releasing it
13362                          * above, and me getting the socket lock, where sacks
13363                          * come in but we have not put the SB_WAIT on the
13364                          * so_snd buffer to get the wakeup. After the LOCK
13365                          * is applied the sack_processing will also need to
13366                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13367                          * once we have the socket buffer lock if we recheck the
13368                          * size we KNOW we will get to sleep safely with the
13369                          * wakeup flag in place.
13370                          */
13371                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13372                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13373                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13374                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13375                                             so, asoc, uio->uio_resid);
13376                                 }
13377                                 be.error = 0;
13378                                 stcb->block_entry = &be;
13379                                 error = sbwait(&so->so_snd);
13380                                 stcb->block_entry = NULL;
13381
13382                                 if (error || so->so_error || be.error) {
13383                                         if (error == 0) {
13384                                                 if (so->so_error)
13385                                                         error = so->so_error;
13386                                                 if (be.error) {
13387                                                         error = be.error;
13388                                                 }
13389                                         }
13390                                         SOCKBUF_UNLOCK(&so->so_snd);
13391                                         goto out_unlocked;
13392                                 }
13393                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13394                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13395                                             so, asoc, stcb->asoc.total_output_queue_size);
13396                                 }
13397                         }
13398                         SOCKBUF_UNLOCK(&so->so_snd);
13399                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13400                                 goto out_unlocked;
13401                         }
13402                 }
13403                 SCTP_TCB_SEND_LOCK(stcb);
13404                 if (sp) {
13405                         if (sp->msg_is_complete == 0) {
13406                                 strm->last_msg_incomplete = 1;
13407                                 asoc->stream_locked = 1;
13408                                 asoc->stream_locked_on = srcv->sinfo_stream;
13409                         } else {
13410                                 sp->sender_all_done = 1;
13411                                 strm->last_msg_incomplete = 0;
13412                                 asoc->stream_locked = 0;
13413                         }
13414                 } else {
13415                         SCTP_PRINTF("Huh no sp TSNH?\n");
13416                         strm->last_msg_incomplete = 0;
13417                         asoc->stream_locked = 0;
13418                 }
13419                 SCTP_TCB_SEND_UNLOCK(stcb);
13420                 if (uio->uio_resid == 0) {
13421                         got_all_of_the_send = 1;
13422                 }
13423         } else {
13424                 /* We send in a 0, since we do NOT have any locks */
13425                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13426                 top = NULL;
13427                 if (srcv->sinfo_flags & SCTP_EOF) {
13428                         /*
13429                          * This should only happen for Panda for the mbuf
13430                          * send case, which does NOT yet support EEOR mode.
13431                          * Thus, we can just set this flag to do the proper
13432                          * EOF handling.
13433                          */
13434                         got_all_of_the_send = 1;
13435                 }
13436         }
13437         if (error) {
13438                 goto out;
13439         }
13440 dataless_eof:
13441         /* EOF thing ? */
13442         if ((srcv->sinfo_flags & SCTP_EOF) &&
13443             (got_all_of_the_send == 1) &&
13444             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
13445                 int cnt;
13446
13447                 SCTP_STAT_INCR(sctps_sends_with_eof);
13448                 error = 0;
13449                 if (hold_tcblock == 0) {
13450                         SCTP_TCB_LOCK(stcb);
13451                         hold_tcblock = 1;
13452                 }
13453                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13454                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13455                     TAILQ_EMPTY(&asoc->sent_queue) &&
13456                     (cnt == 0)) {
13457                         if (asoc->locked_on_sending) {
13458                                 goto abort_anyway;
13459                         }
13460                         /* there is nothing queued to send, so I'm done... */
13461                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13462                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13463                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13464                                 struct sctp_nets *netp;
13465
13466                                 if (stcb->asoc.alternate) {
13467                                         netp = stcb->asoc.alternate;
13468                                 } else {
13469                                         netp = stcb->asoc.primary_destination;
13470                                 }
13471                                 /* only send SHUTDOWN the first time through */
13472                                 sctp_send_shutdown(stcb, netp);
13473                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13474                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13475                                 }
13476                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13477                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13478                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13479                                     netp);
13480                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13481                                     asoc->primary_destination);
13482                         }
13483                 } else {
13484                         /*-
13485                          * we still got (or just got) data to send, so set
13486                          * SHUTDOWN_PENDING
13487                          */
13488                         /*-
13489                          * XXX sockets draft says that SCTP_EOF should be
13490                          * sent with no data.  currently, we will allow user
13491                          * data to be sent first and move to
13492                          * SHUTDOWN-PENDING
13493                          */
13494                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13495                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13496                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13497                                 if (hold_tcblock == 0) {
13498                                         SCTP_TCB_LOCK(stcb);
13499                                         hold_tcblock = 1;
13500                                 }
13501                                 if (asoc->locked_on_sending) {
13502                                         /* Locked to send out the data */
13503                                         struct sctp_stream_queue_pending *sp;
13504
13505                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13506                                         if (sp) {
13507                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13508                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13509                                         }
13510                                 }
13511                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13512                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13513                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13514                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13515                         abort_anyway:
13516                                         if (free_cnt_applied) {
13517                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13518                                                 free_cnt_applied = 0;
13519                                         }
13520                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13521                                             SCTP_RESPONSE_TO_USER_REQ,
13522                                             NULL, SCTP_SO_LOCKED);
13523                                         /*
13524                                          * now relock the stcb so everything
13525                                          * is sane
13526                                          */
13527                                         hold_tcblock = 0;
13528                                         stcb = NULL;
13529                                         goto out;
13530                                 }
13531                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13532                                     asoc->primary_destination);
13533                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13534                         }
13535                 }
13536         }
13537 skip_out_eof:
13538         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13539                 some_on_control = 1;
13540         }
13541         if (queue_only_for_init) {
13542                 if (hold_tcblock == 0) {
13543                         SCTP_TCB_LOCK(stcb);
13544                         hold_tcblock = 1;
13545                 }
13546                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13547                         /* a collision took us forward? */
13548                         queue_only = 0;
13549                 } else {
13550                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13551                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13552                         queue_only = 1;
13553                 }
13554         }
13555         if ((net->flight_size > net->cwnd) &&
13556             (stcb->asoc.sctp_cmt_on_off == 0)) {
13557                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13558                 queue_only = 1;
13559         } else if (asoc->ifp_had_enobuf) {
13560                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13561                 if (net->flight_size > (2 * net->mtu)) {
13562                         queue_only = 1;
13563                 }
13564                 asoc->ifp_had_enobuf = 0;
13565         }
13566         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13567             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13568         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13569             (stcb->asoc.total_flight > 0) &&
13570             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13571             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13572                 /*-
13573                  * Ok, Nagle is set on and we have data outstanding.
13574                  * Don't send anything and let SACKs drive out the
13575                  * data unless wen have a "full" segment to send.
13576                  */
13577                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13578                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13579                 }
13580                 SCTP_STAT_INCR(sctps_naglequeued);
13581                 nagle_applies = 1;
13582         } else {
13583                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13584                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13585                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13586                 }
13587                 SCTP_STAT_INCR(sctps_naglesent);
13588                 nagle_applies = 0;
13589         }
13590         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13591                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13592                     nagle_applies, un_sent);
13593                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13594                     stcb->asoc.total_flight,
13595                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13596         }
13597         if (queue_only_for_init)
13598                 queue_only_for_init = 0;
13599         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13600                 /* we can attempt to send too. */
13601                 if (hold_tcblock == 0) {
13602                         /*
13603                          * If there is activity recv'ing sacks no need to
13604                          * send
13605                          */
13606                         if (SCTP_TCB_TRYLOCK(stcb)) {
13607                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13608                                 hold_tcblock = 1;
13609                         }
13610                 } else {
13611                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13612                 }
13613         } else if ((queue_only == 0) &&
13614                     (stcb->asoc.peers_rwnd == 0) &&
13615             (stcb->asoc.total_flight == 0)) {
13616                 /* We get to have a probe outstanding */
13617                 if (hold_tcblock == 0) {
13618                         hold_tcblock = 1;
13619                         SCTP_TCB_LOCK(stcb);
13620                 }
13621                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13622         } else if (some_on_control) {
13623                 int num_out, reason, frag_point;
13624
13625                 /* Here we do control only */
13626                 if (hold_tcblock == 0) {
13627                         hold_tcblock = 1;
13628                         SCTP_TCB_LOCK(stcb);
13629                 }
13630                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13631                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13632                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13633         }
13634         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13635             queue_only, stcb->asoc.peers_rwnd, un_sent,
13636             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13637             stcb->asoc.total_output_queue_size, error);
13638
13639 out:
13640 out_unlocked:
13641
13642         if (local_soresv && stcb) {
13643                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13644                 local_soresv = 0;
13645         }
13646         if (create_lock_applied) {
13647                 SCTP_ASOC_CREATE_UNLOCK(inp);
13648                 create_lock_applied = 0;
13649         }
13650         if ((stcb) && hold_tcblock) {
13651                 SCTP_TCB_UNLOCK(stcb);
13652         }
13653         if (stcb && free_cnt_applied) {
13654                 atomic_add_int(&stcb->asoc.refcnt, -1);
13655         }
13656 #ifdef INVARIANTS
13657         if (stcb) {
13658                 if (mtx_owned(&stcb->tcb_mtx)) {
13659                         panic("Leaving with tcb mtx owned?");
13660                 }
13661                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13662                         panic("Leaving with tcb send mtx owned?");
13663                 }
13664         }
13665 #endif
13666 #ifdef INVARIANTS
13667         if (inp) {
13668                 sctp_validate_no_locks(inp);
13669         } else {
13670                 printf("Warning - inp is NULL so cant validate locks\n");
13671         }
13672 #endif
13673         if (top) {
13674                 sctp_m_freem(top);
13675         }
13676         if (control) {
13677                 sctp_m_freem(control);
13678         }
13679         return (error);
13680 }
13681
13682
13683 /*
13684  * generate an AUTHentication chunk, if required
13685  */
13686 struct mbuf *
13687 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13688     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13689     struct sctp_tcb *stcb, uint8_t chunk)
13690 {
13691         struct mbuf *m_auth;
13692         struct sctp_auth_chunk *auth;
13693         int chunk_len;
13694
13695         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13696             (stcb == NULL))
13697                 return (m);
13698
13699         /* sysctl disabled auth? */
13700         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13701                 return (m);
13702
13703         /* peer doesn't do auth... */
13704         if (!stcb->asoc.peer_supports_auth) {
13705                 return (m);
13706         }
13707         /* does the requested chunk require auth? */
13708         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13709                 return (m);
13710         }
13711         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13712         if (m_auth == NULL) {
13713                 /* no mbuf's */
13714                 return (m);
13715         }
13716         /* reserve some space if this will be the first mbuf */
13717         if (m == NULL)
13718                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13719         /* fill in the AUTH chunk details */
13720         auth = mtod(m_auth, struct sctp_auth_chunk *);
13721         bzero(auth, sizeof(*auth));
13722         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13723         auth->ch.chunk_flags = 0;
13724         chunk_len = sizeof(*auth) +
13725             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13726         auth->ch.chunk_length = htons(chunk_len);
13727         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13728         /* key id and hmac digest will be computed and filled in upon send */
13729
13730         /* save the offset where the auth was inserted into the chain */
13731         if (m != NULL) {
13732                 struct mbuf *cn;
13733
13734                 *offset = 0;
13735                 cn = m;
13736                 while (cn) {
13737                         *offset += SCTP_BUF_LEN(cn);
13738                         cn = SCTP_BUF_NEXT(cn);
13739                 }
13740         } else
13741                 *offset = 0;
13742
13743         /* update length and return pointer to the auth chunk */
13744         SCTP_BUF_LEN(m_auth) = chunk_len;
13745         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13746         if (auth_ret != NULL)
13747                 *auth_ret = auth;
13748
13749         return (m);
13750 }
13751
13752 #ifdef INET6
13753 int
13754 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13755 {
13756         struct nd_prefix *pfx = NULL;
13757         struct nd_pfxrouter *pfxrtr = NULL;
13758         struct sockaddr_in6 gw6;
13759
13760         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13761                 return (0);
13762
13763         /* get prefix entry of address */
13764         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13765                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13766                         continue;
13767                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13768                     &src6->sin6_addr, &pfx->ndpr_mask))
13769                         break;
13770         }
13771         /* no prefix entry in the prefix list */
13772         if (pfx == NULL) {
13773                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13774                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13775                 return (0);
13776         }
13777         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13778         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13779
13780         /* search installed gateway from prefix entry */
13781         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
13782             pfxrtr->pfr_next) {
13783                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13784                 gw6.sin6_family = AF_INET6;
13785                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13786                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13787                     sizeof(struct in6_addr));
13788                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13789                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13790                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13791                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13792                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13793                     ro->ro_rt->rt_gateway)) {
13794                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13795                         return (1);
13796                 }
13797         }
13798         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13799         return (0);
13800 }
13801
13802 #endif
13803
13804 int
13805 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13806 {
13807 #ifdef INET
13808         struct sockaddr_in *sin, *mask;
13809         struct ifaddr *ifa;
13810         struct in_addr srcnetaddr, gwnetaddr;
13811
13812         if (ro == NULL || ro->ro_rt == NULL ||
13813             sifa->address.sa.sa_family != AF_INET) {
13814                 return (0);
13815         }
13816         ifa = (struct ifaddr *)sifa->ifa;
13817         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13818         sin = (struct sockaddr_in *)&sifa->address.sin;
13819         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13820         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13821         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13822         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13823
13824         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13825         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13826         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13827         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13828         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13829         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13830                 return (1);
13831         }
13832 #endif
13833         return (0);
13834 }