net/tipc/msg.h

   1 /*
   2  * net/tipc/msg.h: Include file for TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2007, 2014-2015 Ericsson AB
   5  * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #ifndef _TIPC_MSG_H
  38 #define _TIPC_MSG_H
  39
  40 #include <linux/tipc.h>
  41 #include "core.h"
  42
  43 /*
  44  * Constants and routines used to read and write TIPC payload message headers
  45  *
  46  * Note: Some items are also used with TIPC internal message headers
  47  */
  48 #define TIPC_VERSION              2
  49 struct plist;
  50
  51 /*
  52  * Payload message users are defined in TIPC's public API:
  53  * - TIPC_LOW_IMPORTANCE
  54  * - TIPC_MEDIUM_IMPORTANCE
  55  * - TIPC_HIGH_IMPORTANCE
  56  * - TIPC_CRITICAL_IMPORTANCE
  57  */
  58 #define TIPC_SYSTEM_IMPORTANCE  4
  59
  60
  61 /*
  62  * Payload message types
  63  */
  64 #define TIPC_CONN_MSG           0
  65 #define TIPC_MCAST_MSG          1
  66 #define TIPC_NAMED_MSG          2
  67 #define TIPC_DIRECT_MSG         3
  68
  69 /*
  70  * Internal message users
  71  */
  72 #define  BCAST_PROTOCOL       5
  73 #define  MSG_BUNDLER          6
  74 #define  LINK_PROTOCOL        7
  75 #define  CONN_MANAGER         8
  76 #define  TUNNEL_PROTOCOL      10
  77 #define  NAME_DISTRIBUTOR     11
  78 #define  MSG_FRAGMENTER       12
  79 #define  LINK_CONFIG          13
  80 #define  SOCK_WAKEUP          14       /* pseudo user */
  81
  82 /*
  83  * Message header sizes
  84  */
  85 #define SHORT_H_SIZE              24    /* In-cluster basic payload message */
  86 #define BASIC_H_SIZE              32    /* Basic payload message */
  87 #define NAMED_H_SIZE              40    /* Named payload message */
  88 #define MCAST_H_SIZE              44    /* Multicast payload message */
  89 #define INT_H_SIZE                40    /* Internal messages */
  90 #define MIN_H_SIZE                24    /* Smallest legal TIPC header size */
  91 #define MAX_H_SIZE                60    /* Largest possible TIPC header size */
  92
  93 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
  94
  95 #define TIPC_MEDIA_INFO_OFFSET  5
  96
  97 struct tipc_skb_cb {
  98         u32 bytes_read;
  99         struct sk_buff *tail;
 100         bool validated;
 101         u16 chain_imp;
 102         u16 ackers;
 103 };
 104
 105 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 106
 107 struct tipc_msg {
 108         __be32 hdr[15];
 109 };
 110
 111 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 112 {
 113         return (struct tipc_msg *)skb->data;
 114 }
 115
 116 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 117 {
 118         return ntohl(m->hdr[pos]);
 119 }
 120
 121 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 122 {
 123         m->hdr[w] = htonl(val);
 124 }
 125
 126 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 127 {
 128         return (msg_word(m, w) >> pos) & mask;
 129 }
 130
 131 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 132                                 u32 pos, u32 mask, u32 val)
 133 {
 134         val = (val & mask) << pos;
 135         mask = mask << pos;
 136         m->hdr[w] &= ~htonl(mask);
 137         m->hdr[w] |= htonl(val);
 138 }
 139
 140 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 141 {
 142         u32 temp = msg->hdr[a];
 143
 144         msg->hdr[a] = msg->hdr[b];
 145         msg->hdr[b] = temp;
 146 }
 147
 148 /*
 149  * Word 0
 150  */
 151 static inline u32 msg_version(struct tipc_msg *m)
 152 {
 153         return msg_bits(m, 0, 29, 7);
 154 }
 155
 156 static inline void msg_set_version(struct tipc_msg *m)
 157 {
 158         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 159 }
 160
 161 static inline u32 msg_user(struct tipc_msg *m)
 162 {
 163         return msg_bits(m, 0, 25, 0xf);
 164 }
 165
 166 static inline u32 msg_isdata(struct tipc_msg *m)
 167 {
 168         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 169 }
 170
 171 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 172 {
 173         msg_set_bits(m, 0, 25, 0xf, n);
 174 }
 175
 176 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 177 {
 178         return msg_bits(m, 0, 21, 0xf) << 2;
 179 }
 180
 181 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 182 {
 183         msg_set_bits(m, 0, 21, 0xf, n>>2);
 184 }
 185
 186 static inline u32 msg_size(struct tipc_msg *m)
 187 {
 188         return msg_bits(m, 0, 0, 0x1ffff);
 189 }
 190
 191 static inline u32 msg_data_sz(struct tipc_msg *m)
 192 {
 193         return msg_size(m) - msg_hdr_sz(m);
 194 }
 195
 196 static inline int msg_non_seq(struct tipc_msg *m)
 197 {
 198         return msg_bits(m, 0, 20, 1);
 199 }
 200
 201 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 202 {
 203         msg_set_bits(m, 0, 20, 1, n);
 204 }
 205
 206 static inline int msg_dest_droppable(struct tipc_msg *m)
 207 {
 208         return msg_bits(m, 0, 19, 1);
 209 }
 210
 211 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 212 {
 213         msg_set_bits(m, 0, 19, 1, d);
 214 }
 215
 216 static inline int msg_src_droppable(struct tipc_msg *m)
 217 {
 218         return msg_bits(m, 0, 18, 1);
 219 }
 220
 221 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 222 {
 223         msg_set_bits(m, 0, 18, 1, d);
 224 }
 225
 226 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 227 {
 228         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 229 }
 230
 231 static inline unchar *msg_data(struct tipc_msg *m)
 232 {
 233         return ((unchar *)m) + msg_hdr_sz(m);
 234 }
 235
 236 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 237 {
 238         return (struct tipc_msg *)msg_data(m);
 239 }
 240
 241 /*
 242  * Word 1
 243  */
 244 static inline u32 msg_type(struct tipc_msg *m)
 245 {
 246         return msg_bits(m, 1, 29, 0x7);
 247 }
 248
 249 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 250 {
 251         msg_set_bits(m, 1, 29, 0x7, n);
 252 }
 253
 254 static inline u32 msg_named(struct tipc_msg *m)
 255 {
 256         return msg_type(m) == TIPC_NAMED_MSG;
 257 }
 258
 259 static inline u32 msg_mcast(struct tipc_msg *m)
 260 {
 261         return msg_type(m) == TIPC_MCAST_MSG;
 262 }
 263
 264 static inline u32 msg_connected(struct tipc_msg *m)
 265 {
 266         return msg_type(m) == TIPC_CONN_MSG;
 267 }
 268
 269 static inline u32 msg_errcode(struct tipc_msg *m)
 270 {
 271         return msg_bits(m, 1, 25, 0xf);
 272 }
 273
 274 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 275 {
 276         msg_set_bits(m, 1, 25, 0xf, err);
 277 }
 278
 279 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 280 {
 281         return msg_bits(m, 1, 21, 0xf);
 282 }
 283
 284 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 285 {
 286         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 287 }
 288
 289 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 290 {
 291         msg_set_bits(m, 1, 21, 0xf, 0);
 292 }
 293
 294 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 295 {
 296         return msg_bits(m, 1, 19, 0x3);
 297 }
 298
 299 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 300 {
 301         msg_set_bits(m, 1, 19, 0x3, n);
 302 }
 303
 304 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 305 {
 306         return msg_bits(m, 1, 0, 0xffff);
 307 }
 308
 309 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 310 {
 311         msg_set_bits(m, 1, 0, 0xffff, n);
 312 }
 313
 314
 315 /*
 316  * Word 2
 317  */
 318 static inline u16 msg_ack(struct tipc_msg *m)
 319 {
 320         return msg_bits(m, 2, 16, 0xffff);
 321 }
 322
 323 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 324 {
 325         msg_set_bits(m, 2, 16, 0xffff, n);
 326 }
 327
 328 static inline u16 msg_seqno(struct tipc_msg *m)
 329 {
 330         return msg_bits(m, 2, 0, 0xffff);
 331 }
 332
 333 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 334 {
 335         msg_set_bits(m, 2, 0, 0xffff, n);
 336 }
 337
 338 /*
 339  * Words 3-10
 340  */
 341 static inline u32 msg_importance(struct tipc_msg *m)
 342 {
 343         int usr = msg_user(m);
 344
 345         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 346                 return usr;
 347         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 348                 return msg_bits(m, 9, 0, 0x7);
 349         return TIPC_SYSTEM_IMPORTANCE;
 350 }
 351
 352 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 353 {
 354         int usr = msg_user(m);
 355
 356         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 357                 msg_set_bits(m, 9, 0, 0x7, i);
 358         else if (i < TIPC_SYSTEM_IMPORTANCE)
 359                 msg_set_user(m, i);
 360         else
 361                 pr_warn("Trying to set illegal importance in message\n");
 362 }
 363
 364 static inline u32 msg_prevnode(struct tipc_msg *m)
 365 {
 366         return msg_word(m, 3);
 367 }
 368
 369 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 370 {
 371         msg_set_word(m, 3, a);
 372 }
 373
 374 static inline u32 msg_origport(struct tipc_msg *m)
 375 {
 376         if (msg_user(m) == MSG_FRAGMENTER)
 377                 m = msg_get_wrapped(m);
 378         return msg_word(m, 4);
 379 }
 380
 381 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 382 {
 383         msg_set_word(m, 4, p);
 384 }
 385
 386 static inline u32 msg_destport(struct tipc_msg *m)
 387 {
 388         return msg_word(m, 5);
 389 }
 390
 391 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 392 {
 393         msg_set_word(m, 5, p);
 394 }
 395
 396 static inline u32 msg_mc_netid(struct tipc_msg *m)
 397 {
 398         return msg_word(m, 5);
 399 }
 400
 401 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 402 {
 403         msg_set_word(m, 5, p);
 404 }
 405
 406 static inline int msg_short(struct tipc_msg *m)
 407 {
 408         return msg_hdr_sz(m) == SHORT_H_SIZE;
 409 }
 410
 411 static inline u32 msg_orignode(struct tipc_msg *m)
 412 {
 413         if (likely(msg_short(m)))
 414                 return msg_prevnode(m);
 415         return msg_word(m, 6);
 416 }
 417
 418 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 419 {
 420         msg_set_word(m, 6, a);
 421 }
 422
 423 static inline u32 msg_destnode(struct tipc_msg *m)
 424 {
 425         return msg_word(m, 7);
 426 }
 427
 428 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 429 {
 430         msg_set_word(m, 7, a);
 431 }
 432
 433 static inline u32 msg_nametype(struct tipc_msg *m)
 434 {
 435         return msg_word(m, 8);
 436 }
 437
 438 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 439 {
 440         msg_set_word(m, 8, n);
 441 }
 442
 443 static inline u32 msg_nameinst(struct tipc_msg *m)
 444 {
 445         return msg_word(m, 9);
 446 }
 447
 448 static inline u32 msg_namelower(struct tipc_msg *m)
 449 {
 450         return msg_nameinst(m);
 451 }
 452
 453 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 454 {
 455         msg_set_word(m, 9, n);
 456 }
 457
 458 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 459 {
 460         msg_set_namelower(m, n);
 461 }
 462
 463 static inline u32 msg_nameupper(struct tipc_msg *m)
 464 {
 465         return msg_word(m, 10);
 466 }
 467
 468 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 469 {
 470         msg_set_word(m, 10, n);
 471 }
 472
 473 /*
 474  * Constants and routines used to read and write TIPC internal message headers
 475  */
 476
 477 /*
 478  *  Connection management protocol message types
 479  */
 480 #define CONN_PROBE        0
 481 #define CONN_PROBE_REPLY  1
 482 #define CONN_ACK          2
 483
 484 /*
 485  * Name distributor message types
 486  */
 487 #define PUBLICATION       0
 488 #define WITHDRAWAL        1
 489
 490 /*
 491  * Segmentation message types
 492  */
 493 #define FIRST_FRAGMENT          0
 494 #define FRAGMENT                1
 495 #define LAST_FRAGMENT           2
 496
 497 /*
 498  * Link management protocol message types
 499  */
 500 #define STATE_MSG               0
 501 #define RESET_MSG               1
 502 #define ACTIVATE_MSG            2
 503
 504 /*
 505  * Changeover tunnel message types
 506  */
 507 #define SYNCH_MSG               0
 508 #define FAILOVER_MSG            1
 509
 510 /*
 511  * Config protocol message types
 512  */
 513 #define DSC_REQ_MSG             0
 514 #define DSC_RESP_MSG            1
 515
 516 /*
 517  * Word 1
 518  */
 519 static inline u32 msg_seq_gap(struct tipc_msg *m)
 520 {
 521         return msg_bits(m, 1, 16, 0x1fff);
 522 }
 523
 524 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 525 {
 526         msg_set_bits(m, 1, 16, 0x1fff, n);
 527 }
 528
 529 static inline u32 msg_node_sig(struct tipc_msg *m)
 530 {
 531         return msg_bits(m, 1, 0, 0xffff);
 532 }
 533
 534 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 535 {
 536         msg_set_bits(m, 1, 0, 0xffff, n);
 537 }
 538
 539 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 540 {
 541         return msg_bits(m, 1, 15, 0x1fff);
 542 }
 543
 544 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 545 {
 546         msg_set_bits(m, 1, 15, 0x1fff, n);
 547 }
 548
 549 /*
 550  * Word 2
 551  */
 552 static inline u32 msg_dest_domain(struct tipc_msg *m)
 553 {
 554         return msg_word(m, 2);
 555 }
 556
 557 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 558 {
 559         msg_set_word(m, 2, n);
 560 }
 561
 562 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 563 {
 564         return msg_bits(m, 2, 16, 0xffff);
 565 }
 566
 567 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 568 {
 569         msg_set_bits(m, 2, 16, 0xffff, n);
 570 }
 571
 572 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 573 {
 574         return msg_bits(m, 2, 0, 0xffff);
 575 }
 576
 577 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 578 {
 579         msg_set_bits(m, 2, 0, 0xffff, n);
 580 }
 581
 582
 583 /*
 584  * Word 4
 585  */
 586 static inline u32 msg_last_bcast(struct tipc_msg *m)
 587 {
 588         return msg_bits(m, 4, 16, 0xffff);
 589 }
 590
 591 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 592 {
 593         return msg_last_bcast(m) + 1;
 594 }
 595
 596 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 597 {
 598         msg_set_bits(m, 4, 16, 0xffff, n);
 599 }
 600
 601 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 602 {
 603         msg_set_bits(m, 4, 16, 0xffff, n);
 604 }
 605
 606
 607 static inline u16 msg_next_sent(struct tipc_msg *m)
 608 {
 609         return msg_bits(m, 4, 0, 0xffff);
 610 }
 611
 612 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 613 {
 614         msg_set_bits(m, 4, 0, 0xffff, n);
 615 }
 616
 617 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 618 {
 619         msg_set_bits(m, 4, 0, 0xffff, n);
 620 }
 621
 622 static inline u32 msg_bc_netid(struct tipc_msg *m)
 623 {
 624         return msg_word(m, 4);
 625 }
 626
 627 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 628 {
 629         msg_set_word(m, 4, id);
 630 }
 631
 632 static inline u32 msg_link_selector(struct tipc_msg *m)
 633 {
 634         if (msg_user(m) == MSG_FRAGMENTER)
 635                 m = (void *)msg_data(m);
 636         return msg_bits(m, 4, 0, 1);
 637 }
 638
 639 /*
 640  * Word 5
 641  */
 642 static inline u16 msg_session(struct tipc_msg *m)
 643 {
 644         return msg_bits(m, 5, 16, 0xffff);
 645 }
 646
 647 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 648 {
 649         msg_set_bits(m, 5, 16, 0xffff, n);
 650 }
 651
 652 static inline u32 msg_probe(struct tipc_msg *m)
 653 {
 654         return msg_bits(m, 5, 0, 1);
 655 }
 656
 657 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 658 {
 659         msg_set_bits(m, 5, 0, 1, val);
 660 }
 661
 662 static inline char msg_net_plane(struct tipc_msg *m)
 663 {
 664         return msg_bits(m, 5, 1, 7) + 'A';
 665 }
 666
 667 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 668 {
 669         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 670 }
 671
 672 static inline u32 msg_linkprio(struct tipc_msg *m)
 673 {
 674         return msg_bits(m, 5, 4, 0x1f);
 675 }
 676
 677 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 678 {
 679         msg_set_bits(m, 5, 4, 0x1f, n);
 680 }
 681
 682 static inline u32 msg_bearer_id(struct tipc_msg *m)
 683 {
 684         return msg_bits(m, 5, 9, 0x7);
 685 }
 686
 687 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 688 {
 689         msg_set_bits(m, 5, 9, 0x7, n);
 690 }
 691
 692 static inline u32 msg_redundant_link(struct tipc_msg *m)
 693 {
 694         return msg_bits(m, 5, 12, 0x1);
 695 }
 696
 697 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 698 {
 699         msg_set_bits(m, 5, 12, 0x1, r);
 700 }
 701
 702 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 703 {
 704         return msg_bits(m, 5, 13, 0x1);
 705 }
 706
 707 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 708 {
 709         msg_set_bits(m, 5, 13, 0x1, s);
 710 }
 711
 712 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
 713 {
 714         switch (msg_user(m)) {
 715         case BCAST_PROTOCOL:
 716         case NAME_DISTRIBUTOR:
 717         case LINK_PROTOCOL:
 718                 return msg_bits(m, 5, 14, 0x1);
 719         default:
 720                 return false;
 721         }
 722 }
 723
 724 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
 725 {
 726         msg_set_bits(m, 5, 14, 0x1, invalid);
 727 }
 728
 729 static inline char *msg_media_addr(struct tipc_msg *m)
 730 {
 731         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 732 }
 733
 734 static inline u32 msg_bc_gap(struct tipc_msg *m)
 735 {
 736         return msg_bits(m, 8, 0, 0x3ff);
 737 }
 738
 739 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
 740 {
 741         msg_set_bits(m, 8, 0, 0x3ff, n);
 742 }
 743
 744 /*
 745  * Word 9
 746  */
 747 static inline u16 msg_msgcnt(struct tipc_msg *m)
 748 {
 749         return msg_bits(m, 9, 16, 0xffff);
 750 }
 751
 752 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 753 {
 754         msg_set_bits(m, 9, 16, 0xffff, n);
 755 }
 756
 757 static inline u32 msg_conn_ack(struct tipc_msg *m)
 758 {
 759         return msg_bits(m, 9, 16, 0xffff);
 760 }
 761
 762 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 763 {
 764         msg_set_bits(m, 9, 16, 0xffff, n);
 765 }
 766
 767 static inline u32 msg_adv_win(struct tipc_msg *m)
 768 {
 769         return msg_bits(m, 9, 0, 0xffff);
 770 }
 771
 772 static inline void msg_set_adv_win(struct tipc_msg *m, u32 n)
 773 {
 774         msg_set_bits(m, 9, 0, 0xffff, n);
 775 }
 776
 777 static inline u32 msg_max_pkt(struct tipc_msg *m)
 778 {
 779         return msg_bits(m, 9, 16, 0xffff) * 4;
 780 }
 781
 782 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 783 {
 784         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 785 }
 786
 787 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 788 {
 789         return msg_bits(m, 9, 0, 0xffff);
 790 }
 791
 792 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 793 {
 794         msg_set_bits(m, 9, 0, 0xffff, n);
 795 }
 796
 797 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
 798 {
 799         if (likely(msg_user(m) != LINK_PROTOCOL))
 800                 return true;
 801         if (msg_type(m) == STATE_MSG)
 802                 return true;
 803         return false;
 804 }
 805
 806 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
 807 {
 808         if (msg_peer_link_is_up(m))
 809                 return true;
 810         return msg_redundant_link(m);
 811 }
 812
 813 static inline bool msg_is_reset(struct tipc_msg *hdr)
 814 {
 815         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
 816 }
 817
 818 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
 819 bool tipc_msg_validate(struct sk_buff *skb);
 820 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
 821 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 822                    u32 hsize, u32 destnode);
 823 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 824                                 uint data_sz, u32 dnode, u32 onode,
 825                                 u32 dport, u32 oport, int errcode);
 826 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 827 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
 828 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
 829                           u32 mtu, u32 dnode);
 830 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 831 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 832                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 833 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
 834 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
 835 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
 836                         struct sk_buff_head *cpy);
 837 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
 838                              struct sk_buff *skb);
 839
 840 static inline u16 buf_seqno(struct sk_buff *skb)
 841 {
 842         return msg_seqno(buf_msg(skb));
 843 }
 844
 845 /* tipc_skb_peek(): peek and reserve first buffer in list
 846  * @list: list to be peeked in
 847  * Returns pointer to first buffer in list, if any
 848  */
 849 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
 850                                             spinlock_t *lock)
 851 {
 852         struct sk_buff *skb;
 853
 854         spin_lock_bh(lock);
 855         skb = skb_peek(list);
 856         if (skb)
 857                 skb_get(skb);
 858         spin_unlock_bh(lock);
 859         return skb;
 860 }
 861
 862 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
 863  *                       up to and including 'filter'.
 864  * Note: ignoring previously tried destinations minimizes the risk of
 865  *       contention on the socket lock
 866  * @list: list to be peeked in
 867  * @filter: last destination to be ignored from search
 868  * Returns a destination port number, of applicable.
 869  */
 870 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
 871 {
 872         struct sk_buff *skb;
 873         u32 dport = 0;
 874         bool ignore = true;
 875
 876         spin_lock_bh(&list->lock);
 877         skb_queue_walk(list, skb) {
 878                 dport = msg_destport(buf_msg(skb));
 879                 if (!filter || skb_queue_is_last(list, skb))
 880                         break;
 881                 if (dport == filter)
 882                         ignore = false;
 883                 else if (!ignore)
 884                         break;
 885         }
 886         spin_unlock_bh(&list->lock);
 887         return dport;
 888 }
 889
 890 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
 891  * @list: list to be unlinked from
 892  * @dport: selection criteria for buffer to unlink
 893  */
 894 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
 895                                                u32 dport)
 896 {
 897         struct sk_buff *_skb, *tmp, *skb = NULL;
 898
 899         spin_lock_bh(&list->lock);
 900         skb_queue_walk_safe(list, _skb, tmp) {
 901                 if (msg_destport(buf_msg(_skb)) == dport) {
 902                         __skb_unlink(_skb, list);
 903                         skb = _skb;
 904                         break;
 905                 }
 906         }
 907         spin_unlock_bh(&list->lock);
 908         return skb;
 909 }
 910
 911 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
 912  * @list: the new list to append. Not lock protected
 913  * @head: target list. Lock protected.
 914  */
 915 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
 916                                               struct sk_buff_head *head)
 917 {
 918         spin_lock_bh(&head->lock);
 919         skb_queue_splice_tail(list, head);
 920         spin_unlock_bh(&head->lock);
 921 }
 922
 923 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
 924  * @list: the new list to add. Lock protected. Will be reinitialized
 925  * @head: target list. Lock protected.
 926  */
 927 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
 928                                                    struct sk_buff_head *head)
 929 {
 930         struct sk_buff_head tmp;
 931
 932         __skb_queue_head_init(&tmp);
 933
 934         spin_lock_bh(&list->lock);
 935         skb_queue_splice_tail_init(list, &tmp);
 936         spin_unlock_bh(&list->lock);
 937         tipc_skb_queue_splice_tail(&tmp, head);
 938 }
 939
 940 #endif