net/tipc/msg.h

   1 /*
   2  * net/tipc/msg.h: Include file for TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2006, Ericsson AB
   5  * Copyright (c) 2005, 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 "core.h"
  41
  42 #define TIPC_VERSION              2
  43 #define DATA_LOW                  TIPC_LOW_IMPORTANCE
  44 #define DATA_MEDIUM               TIPC_MEDIUM_IMPORTANCE
  45 #define DATA_HIGH                 TIPC_HIGH_IMPORTANCE
  46 #define DATA_CRITICAL             TIPC_CRITICAL_IMPORTANCE
  47 #define SHORT_H_SIZE              24    /* Connected,in cluster */
  48 #define DIR_MSG_H_SIZE            32    /* Directly addressed messages */
  49 #define CONN_MSG_H_SIZE           36    /* Routed connected msgs*/
  50 #define LONG_H_SIZE               40    /* Named Messages */
  51 #define MCAST_H_SIZE              44    /* Multicast messages */
  52 #define MAX_H_SIZE                60    /* Inclusive full options */
  53 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
  54 #define LINK_CONFIG               13
  55
  56
  57 /*
  58                 TIPC user data message header format, version 2
  59
  60         - Fundamental definitions available to privileged TIPC users
  61           are located in tipc_msg.h.
  62         - Remaining definitions available to TIPC internal users appear below.
  63 */
  64
  65
  66 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
  67 {
  68         m->hdr[w] = htonl(val);
  69 }
  70
  71 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
  72                                 u32 pos, u32 mask, u32 val)
  73 {
  74         u32 word = msg_word(m,w) & ~(mask << pos);
  75         msg_set_word(m, w, (word |= (val << pos)));
  76 }
  77
  78 /*
  79  * Word 0
  80  */
  81
  82 static inline u32 msg_version(struct tipc_msg *m)
  83 {
  84         return msg_bits(m, 0, 29, 7);
  85 }
  86
  87 static inline void msg_set_version(struct tipc_msg *m)
  88 {
  89         msg_set_bits(m, 0, 29, 0xf, TIPC_VERSION);
  90 }
  91
  92 static inline u32 msg_user(struct tipc_msg *m)
  93 {
  94         return msg_bits(m, 0, 25, 0xf);
  95 }
  96
  97 static inline u32 msg_isdata(struct tipc_msg *m)
  98 {
  99         return (msg_user(m) <= DATA_CRITICAL);
 100 }
 101
 102 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 103 {
 104         msg_set_bits(m, 0, 25, 0xf, n);
 105 }
 106
 107 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 108 {
 109         msg_set_user(m, i);
 110 }
 111
 112 static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n)
 113 {
 114         msg_set_bits(m, 0, 21, 0xf, n>>2);
 115 }
 116
 117 static inline int msg_non_seq(struct tipc_msg *m)
 118 {
 119         return msg_bits(m, 0, 20, 1);
 120 }
 121
 122 static inline void msg_set_non_seq(struct tipc_msg *m)
 123 {
 124         msg_set_bits(m, 0, 20, 1, 1);
 125 }
 126
 127 static inline int msg_dest_droppable(struct tipc_msg *m)
 128 {
 129         return msg_bits(m, 0, 19, 1);
 130 }
 131
 132 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 133 {
 134         msg_set_bits(m, 0, 19, 1, d);
 135 }
 136
 137 static inline int msg_src_droppable(struct tipc_msg *m)
 138 {
 139         return msg_bits(m, 0, 18, 1);
 140 }
 141
 142 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 143 {
 144         msg_set_bits(m, 0, 18, 1, d);
 145 }
 146
 147 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 148 {
 149         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 150 }
 151
 152
 153 /*
 154  * Word 1
 155  */
 156
 157 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 158 {
 159         msg_set_bits(m, 1, 29, 0x7, n);
 160 }
 161
 162 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 163 {
 164         msg_set_bits(m, 1, 25, 0xf, err);
 165 }
 166
 167 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 168 {
 169         return msg_bits(m, 1, 21, 0xf);
 170 }
 171
 172 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 173 {
 174         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 175 }
 176
 177 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 178 {
 179         msg_set_bits(m, 1, 21, 0xf, 0);
 180 }
 181
 182 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 183 {
 184         return msg_bits(m, 1, 19, 0x3);
 185 }
 186
 187 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 188 {
 189         msg_set_bits(m, 1, 19, 0x3, n);
 190 }
 191
 192 static inline void msg_set_options(struct tipc_msg *m, const char *opt, u32 sz)
 193 {
 194         u32 hsz = msg_hdr_sz(m);
 195         char *to = (char *)&m->hdr[hsz/4];
 196
 197         if ((hsz < DIR_MSG_H_SIZE) || ((hsz + sz) > MAX_H_SIZE))
 198                 return;
 199         msg_set_bits(m, 1, 16, 0x7, (hsz - 28)/4);
 200         msg_set_hdr_sz(m, hsz + sz);
 201         memcpy(to, opt, sz);
 202 }
 203
 204 static inline u32 msg_bcast_ack(struct tipc_msg *m)
 205 {
 206         return msg_bits(m, 1, 0, 0xffff);
 207 }
 208
 209 static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
 210 {
 211         msg_set_bits(m, 1, 0, 0xffff, n);
 212 }
 213
 214
 215 /*
 216  * Word 2
 217  */
 218
 219 static inline u32 msg_ack(struct tipc_msg *m)
 220 {
 221         return msg_bits(m, 2, 16, 0xffff);
 222 }
 223
 224 static inline void msg_set_ack(struct tipc_msg *m, u32 n)
 225 {
 226         msg_set_bits(m, 2, 16, 0xffff, n);
 227 }
 228
 229 static inline u32 msg_seqno(struct tipc_msg *m)
 230 {
 231         return msg_bits(m, 2, 0, 0xffff);
 232 }
 233
 234 static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
 235 {
 236         msg_set_bits(m, 2, 0, 0xffff, n);
 237 }
 238
 239
 240 /*
 241  * Words 3-10
 242  */
 243
 244
 245 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 246 {
 247         msg_set_word(m, 3, a);
 248 }
 249
 250 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 251 {
 252         msg_set_word(m, 4, p);
 253 }
 254
 255 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 256 {
 257         msg_set_word(m, 5, p);
 258 }
 259
 260 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 261 {
 262         msg_set_word(m, 5, p);
 263 }
 264
 265 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 266 {
 267         msg_set_word(m, 6, a);
 268 }
 269
 270 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 271 {
 272         msg_set_word(m, 7, a);
 273 }
 274
 275 static inline int msg_is_dest(struct tipc_msg *m, u32 d)
 276 {
 277         return(msg_short(m) || (msg_destnode(m) == d));
 278 }
 279
 280 static inline u32 msg_routed(struct tipc_msg *m)
 281 {
 282         if (likely(msg_short(m)))
 283                 return 0;
 284         return(msg_destnode(m) ^ msg_orignode(m)) >> 11;
 285 }
 286
 287 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 288 {
 289         msg_set_word(m, 8, n);
 290 }
 291
 292 static inline u32 msg_transp_seqno(struct tipc_msg *m)
 293 {
 294         return msg_word(m, 8);
 295 }
 296
 297 static inline void msg_set_timestamp(struct tipc_msg *m, u32 n)
 298 {
 299         msg_set_word(m, 8, n);
 300 }
 301
 302 static inline u32 msg_timestamp(struct tipc_msg *m)
 303 {
 304         return msg_word(m, 8);
 305 }
 306
 307 static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n)
 308 {
 309         msg_set_word(m, 8, n);
 310 }
 311
 312 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 313 {
 314         msg_set_word(m, 9, n);
 315 }
 316
 317 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 318 {
 319         msg_set_namelower(m, n);
 320 }
 321
 322 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 323 {
 324         msg_set_word(m, 10, n);
 325 }
 326
 327 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 328 {
 329         return (struct tipc_msg *)msg_data(m);
 330 }
 331
 332 static inline void msg_expand(struct tipc_msg *m, u32 destnode)
 333 {
 334         if (!msg_short(m))
 335                 return;
 336         msg_set_hdr_sz(m, LONG_H_SIZE);
 337         msg_set_orignode(m, msg_prevnode(m));
 338         msg_set_destnode(m, destnode);
 339         memset(&m->hdr[8], 0, 12);
 340 }
 341
 342
 343
 344 /*
 345                 TIPC internal message header format, version 2
 346
 347        1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0
 348       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 349    w0:|vers |msg usr|hdr sz |n|resrv|            packet size          |
 350       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 351    w1:|m typ|rsv=0|   sequence gap    |       broadcast ack no        |
 352       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 353    w2:| link level ack no/bc_gap_from |     seq no / bcast_gap_to     |
 354       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 355    w3:|                       previous node                           |
 356       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 357    w4:|  next sent broadcast/fragm no | next sent pkt/ fragm msg no   |
 358       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 359    w5:|          session no           |rsv=0|r|berid|link prio|netpl|p|
 360       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 361    w6:|                      originating node                         |
 362       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 363    w7:|                      destination node                         |
 364       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 365    w8:|                   transport sequence number                   |
 366       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 367    w9:|   msg count / bcast tag       |       link tolerance          |
 368       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 369       \                                                               \
 370       /                     User Specific Data                        /
 371       \                                                               \
 372       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 373
 374       NB: CONN_MANAGER use data message format. LINK_CONFIG has own format.
 375 */
 376
 377 /*
 378  * Internal users
 379  */
 380
 381 #define  BCAST_PROTOCOL       5
 382 #define  MSG_BUNDLER          6
 383 #define  LINK_PROTOCOL        7
 384 #define  CONN_MANAGER         8
 385 #define  ROUTE_DISTRIBUTOR    9
 386 #define  CHANGEOVER_PROTOCOL  10
 387 #define  NAME_DISTRIBUTOR     11
 388 #define  MSG_FRAGMENTER       12
 389 #define  LINK_CONFIG          13
 390 #define  INT_H_SIZE           40
 391 #define  DSC_H_SIZE           40
 392
 393 /*
 394  *  Connection management protocol messages
 395  */
 396
 397 #define CONN_PROBE        0
 398 #define CONN_PROBE_REPLY  1
 399 #define CONN_ACK          2
 400
 401 /*
 402  * Name distributor messages
 403  */
 404
 405 #define PUBLICATION       0
 406 #define WITHDRAWAL        1
 407
 408
 409 /*
 410  * Word 1
 411  */
 412
 413 static inline u32 msg_seq_gap(struct tipc_msg *m)
 414 {
 415         return msg_bits(m, 1, 16, 0xff);
 416 }
 417
 418 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 419 {
 420         msg_set_bits(m, 1, 16, 0xff, n);
 421 }
 422
 423 static inline u32 msg_req_links(struct tipc_msg *m)
 424 {
 425         return msg_bits(m, 1, 16, 0xfff);
 426 }
 427
 428 static inline void msg_set_req_links(struct tipc_msg *m, u32 n)
 429 {
 430         msg_set_bits(m, 1, 16, 0xfff, n);
 431 }
 432
 433
 434 /*
 435  * Word 2
 436  */
 437
 438 static inline u32 msg_dest_domain(struct tipc_msg *m)
 439 {
 440         return msg_word(m, 2);
 441 }
 442
 443 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 444 {
 445         msg_set_word(m, 2, n);
 446 }
 447
 448 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 449 {
 450         return msg_bits(m, 2, 16, 0xffff);
 451 }
 452
 453 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 454 {
 455         msg_set_bits(m, 2, 16, 0xffff, n);
 456 }
 457
 458 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 459 {
 460         return msg_bits(m, 2, 0, 0xffff);
 461 }
 462
 463 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 464 {
 465         msg_set_bits(m, 2, 0, 0xffff, n);
 466 }
 467
 468
 469 /*
 470  * Word 4
 471  */
 472
 473 static inline u32 msg_last_bcast(struct tipc_msg *m)
 474 {
 475         return msg_bits(m, 4, 16, 0xffff);
 476 }
 477
 478 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 479 {
 480         msg_set_bits(m, 4, 16, 0xffff, n);
 481 }
 482
 483
 484 static inline u32 msg_fragm_no(struct tipc_msg *m)
 485 {
 486         return msg_bits(m, 4, 16, 0xffff);
 487 }
 488
 489 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 490 {
 491         msg_set_bits(m, 4, 16, 0xffff, n);
 492 }
 493
 494
 495 static inline u32 msg_next_sent(struct tipc_msg *m)
 496 {
 497         return msg_bits(m, 4, 0, 0xffff);
 498 }
 499
 500 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
 501 {
 502         msg_set_bits(m, 4, 0, 0xffff, n);
 503 }
 504
 505
 506 static inline u32 msg_long_msgno(struct tipc_msg *m)
 507 {
 508         return msg_bits(m, 4, 0, 0xffff);
 509 }
 510
 511 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 512 {
 513         msg_set_bits(m, 4, 0, 0xffff, n);
 514 }
 515
 516 static inline u32 msg_bc_netid(struct tipc_msg *m)
 517 {
 518         return msg_word(m, 4);
 519 }
 520
 521 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 522 {
 523         msg_set_word(m, 4, id);
 524 }
 525
 526 static inline u32 msg_link_selector(struct tipc_msg *m)
 527 {
 528         return msg_bits(m, 4, 0, 1);
 529 }
 530
 531 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
 532 {
 533         msg_set_bits(m, 4, 0, 1, (n & 1));
 534 }
 535
 536 /*
 537  * Word 5
 538  */
 539
 540 static inline u32 msg_session(struct tipc_msg *m)
 541 {
 542         return msg_bits(m, 5, 16, 0xffff);
 543 }
 544
 545 static inline void msg_set_session(struct tipc_msg *m, u32 n)
 546 {
 547         msg_set_bits(m, 5, 16, 0xffff, n);
 548 }
 549
 550 static inline u32 msg_probe(struct tipc_msg *m)
 551 {
 552         return msg_bits(m, 5, 0, 1);
 553 }
 554
 555 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 556 {
 557         msg_set_bits(m, 5, 0, 1, (val & 1));
 558 }
 559
 560 static inline char msg_net_plane(struct tipc_msg *m)
 561 {
 562         return msg_bits(m, 5, 1, 7) + 'A';
 563 }
 564
 565 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 566 {
 567         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 568 }
 569
 570 static inline u32 msg_linkprio(struct tipc_msg *m)
 571 {
 572         return msg_bits(m, 5, 4, 0x1f);
 573 }
 574
 575 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 576 {
 577         msg_set_bits(m, 5, 4, 0x1f, n);
 578 }
 579
 580 static inline u32 msg_bearer_id(struct tipc_msg *m)
 581 {
 582         return msg_bits(m, 5, 9, 0x7);
 583 }
 584
 585 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 586 {
 587         msg_set_bits(m, 5, 9, 0x7, n);
 588 }
 589
 590 static inline u32 msg_redundant_link(struct tipc_msg *m)
 591 {
 592         return msg_bits(m, 5, 12, 0x1);
 593 }
 594
 595 static inline void msg_set_redundant_link(struct tipc_msg *m)
 596 {
 597         msg_set_bits(m, 5, 12, 0x1, 1);
 598 }
 599
 600 static inline void msg_clear_redundant_link(struct tipc_msg *m)
 601 {
 602         msg_set_bits(m, 5, 12, 0x1, 0);
 603 }
 604
 605
 606 /*
 607  * Word 9
 608  */
 609
 610 static inline u32 msg_msgcnt(struct tipc_msg *m)
 611 {
 612         return msg_bits(m, 9, 16, 0xffff);
 613 }
 614
 615 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
 616 {
 617         msg_set_bits(m, 9, 16, 0xffff, n);
 618 }
 619
 620 static inline u32 msg_bcast_tag(struct tipc_msg *m)
 621 {
 622         return msg_bits(m, 9, 16, 0xffff);
 623 }
 624
 625 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
 626 {
 627         msg_set_bits(m, 9, 16, 0xffff, n);
 628 }
 629
 630 static inline u32 msg_max_pkt(struct tipc_msg *m)
 631 {
 632         return (msg_bits(m, 9, 16, 0xffff) * 4);
 633 }
 634
 635 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 636 {
 637         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 638 }
 639
 640 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 641 {
 642         return msg_bits(m, 9, 0, 0xffff);
 643 }
 644
 645 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 646 {
 647         msg_set_bits(m, 9, 0, 0xffff, n);
 648 }
 649
 650 /*
 651  * Routing table message data
 652  */
 653
 654
 655 static inline u32 msg_remote_node(struct tipc_msg *m)
 656 {
 657         return msg_word(m, msg_hdr_sz(m)/4);
 658 }
 659
 660 static inline void msg_set_remote_node(struct tipc_msg *m, u32 a)
 661 {
 662         msg_set_word(m, msg_hdr_sz(m)/4, a);
 663 }
 664
 665 static inline int msg_dataoctet(struct tipc_msg *m, u32 pos)
 666 {
 667         return(msg_data(m)[pos + 4] != 0);
 668 }
 669
 670 static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos)
 671 {
 672         msg_data(m)[pos + 4] = 1;
 673 }
 674
 675 /*
 676  * Segmentation message types
 677  */
 678
 679 #define FIRST_FRAGMENT     0
 680 #define FRAGMENT           1
 681 #define LAST_FRAGMENT      2
 682
 683 /*
 684  * Link management protocol message types
 685  */
 686
 687 #define STATE_MSG       0
 688 #define RESET_MSG       1
 689 #define ACTIVATE_MSG    2
 690
 691 /*
 692  * Changeover tunnel message types
 693  */
 694 #define DUPLICATE_MSG    0
 695 #define ORIGINAL_MSG     1
 696
 697 /*
 698  * Routing table message types
 699  */
 700 #define EXT_ROUTING_TABLE    0
 701 #define LOCAL_ROUTING_TABLE  1
 702 #define SLAVE_ROUTING_TABLE  2
 703 #define ROUTE_ADDITION       3
 704 #define ROUTE_REMOVAL        4
 705
 706 /*
 707  * Config protocol message types
 708  */
 709
 710 #define DSC_REQ_MSG          0
 711 #define DSC_RESP_MSG         1
 712
 713 static inline u32 msg_tot_importance(struct tipc_msg *m)
 714 {
 715         if (likely(msg_isdata(m))) {
 716                 if (likely(msg_orignode(m) == tipc_own_addr))
 717                         return msg_importance(m);
 718                 return msg_importance(m) + 4;
 719         }
 720         if ((msg_user(m) == MSG_FRAGMENTER)  &&
 721             (msg_type(m) == FIRST_FRAGMENT))
 722                 return msg_importance(msg_get_wrapped(m));
 723         return msg_importance(m);
 724 }
 725
 726
 727 static inline void msg_init(struct tipc_msg *m, u32 user, u32 type,
 728                             u32 err, u32 hsize, u32 destnode)
 729 {
 730         memset(m, 0, hsize);
 731         msg_set_version(m);
 732         msg_set_user(m, user);
 733         msg_set_hdr_sz(m, hsize);
 734         msg_set_size(m, hsize);
 735         msg_set_prevnode(m, tipc_own_addr);
 736         msg_set_type(m, type);
 737         msg_set_errcode(m, err);
 738         if (!msg_short(m)) {
 739                 msg_set_orignode(m, tipc_own_addr);
 740                 msg_set_destnode(m, destnode);
 741         }
 742 }
 743
 744 /**
 745  * msg_calc_data_size - determine total data size for message
 746  */
 747
 748 static inline int msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
 749 {
 750         int dsz = 0;
 751         int i;
 752
 753         for (i = 0; i < num_sect; i++)
 754                 dsz += msg_sect[i].iov_len;
 755         return dsz;
 756 }
 757
 758 /**
 759  * msg_build - create message using specified header and data
 760  *
 761  * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
 762  *
 763  * Returns message data size or errno
 764  */
 765
 766 static inline int msg_build(struct tipc_msg *hdr,
 767                             struct iovec const *msg_sect, u32 num_sect,
 768                             int max_size, int usrmem, struct sk_buff** buf)
 769 {
 770         int dsz, sz, hsz, pos, res, cnt;
 771
 772         dsz = msg_calc_data_size(msg_sect, num_sect);
 773         if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
 774                 *buf = NULL;
 775                 return -EINVAL;
 776         }
 777
 778         pos = hsz = msg_hdr_sz(hdr);
 779         sz = hsz + dsz;
 780         msg_set_size(hdr, sz);
 781         if (unlikely(sz > max_size)) {
 782                 *buf = NULL;
 783                 return dsz;
 784         }
 785
 786         *buf = buf_acquire(sz);
 787         if (!(*buf))
 788                 return -ENOMEM;
 789         memcpy((*buf)->data, (unchar *)hdr, hsz);
 790         for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
 791                 if (likely(usrmem))
 792                         res = !copy_from_user((*buf)->data + pos,
 793                                               msg_sect[cnt].iov_base,
 794                                               msg_sect[cnt].iov_len);
 795                 else
 796                         memcpy((*buf)->data + pos, msg_sect[cnt].iov_base,
 797                                msg_sect[cnt].iov_len);
 798                 pos += msg_sect[cnt].iov_len;
 799         }
 800         if (likely(res))
 801                 return dsz;
 802
 803         buf_discard(*buf);
 804         *buf = NULL;
 805         return -EFAULT;
 806 }
 807
 808 static inline void msg_set_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
 809 {
 810         memcpy(&((int *)m)[5], a, sizeof(*a));
 811 }
 812
 813 static inline void msg_get_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
 814 {
 815         memcpy(a, &((int*)m)[5], sizeof(*a));
 816 }
 817
 818 #endif