net/tipc/msg.h

   1 /*
   2  * net/tipc/msg.h: Include file for TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2007, Ericsson AB
   5  * Copyright (c) 2005-2007, 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         val = (val & mask) << pos;
  75         m->hdr[w] &= ~htonl(mask << pos);
  76         m->hdr[w] |= htonl(val);
  77 }
  78
  79 /*
  80  * Word 0
  81  */
  82
  83 static inline u32 msg_version(struct tipc_msg *m)
  84 {
  85         return msg_bits(m, 0, 29, 7);
  86 }
  87
  88 static inline void msg_set_version(struct tipc_msg *m)
  89 {
  90         msg_set_bits(m, 0, 29, 0xf, TIPC_VERSION);
  91 }
  92
  93 static inline u32 msg_user(struct tipc_msg *m)
  94 {
  95         return msg_bits(m, 0, 25, 0xf);
  96 }
  97
  98 static inline u32 msg_isdata(struct tipc_msg *m)
  99 {
 100         return (msg_user(m) <= DATA_CRITICAL);
 101 }
 102
 103 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 104 {
 105         msg_set_bits(m, 0, 25, 0xf, n);
 106 }
 107
 108 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 109 {
 110         msg_set_user(m, i);
 111 }
 112
 113 static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n)
 114 {
 115         msg_set_bits(m, 0, 21, 0xf, n>>2);
 116 }
 117
 118 static inline int msg_non_seq(struct tipc_msg *m)
 119 {
 120         return msg_bits(m, 0, 20, 1);
 121 }
 122
 123 static inline void msg_set_non_seq(struct tipc_msg *m)
 124 {
 125         msg_set_bits(m, 0, 20, 1, 1);
 126 }
 127
 128 static inline int msg_dest_droppable(struct tipc_msg *m)
 129 {
 130         return msg_bits(m, 0, 19, 1);
 131 }
 132
 133 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 134 {
 135         msg_set_bits(m, 0, 19, 1, d);
 136 }
 137
 138 static inline int msg_src_droppable(struct tipc_msg *m)
 139 {
 140         return msg_bits(m, 0, 18, 1);
 141 }
 142
 143 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 144 {
 145         msg_set_bits(m, 0, 18, 1, d);
 146 }
 147
 148 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 149 {
 150         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 151 }
 152
 153
 154 /*
 155  * Word 1
 156  */
 157
 158 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 159 {
 160         msg_set_bits(m, 1, 29, 0x7, n);
 161 }
 162
 163 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 164 {
 165         msg_set_bits(m, 1, 25, 0xf, err);
 166 }
 167
 168 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 169 {
 170         return msg_bits(m, 1, 21, 0xf);
 171 }
 172
 173 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 174 {
 175         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 176 }
 177
 178 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 179 {
 180         msg_set_bits(m, 1, 21, 0xf, 0);
 181 }
 182
 183 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 184 {
 185         return msg_bits(m, 1, 19, 0x3);
 186 }
 187
 188 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 189 {
 190         msg_set_bits(m, 1, 19, 0x3, n);
 191 }
 192
 193 static inline void msg_set_options(struct tipc_msg *m, const char *opt, u32 sz)
 194 {
 195         u32 hsz = msg_hdr_sz(m);
 196         char *to = (char *)&m->hdr[hsz/4];
 197
 198         if ((hsz < DIR_MSG_H_SIZE) || ((hsz + sz) > MAX_H_SIZE))
 199                 return;
 200         msg_set_bits(m, 1, 16, 0x7, (hsz - 28)/4);
 201         msg_set_hdr_sz(m, hsz + sz);
 202         memcpy(to, opt, sz);
 203 }
 204
 205 static inline u32 msg_bcast_ack(struct tipc_msg *m)
 206 {
 207         return msg_bits(m, 1, 0, 0xffff);
 208 }
 209
 210 static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
 211 {
 212         msg_set_bits(m, 1, 0, 0xffff, n);
 213 }
 214
 215
 216 /*
 217  * Word 2
 218  */
 219
 220 static inline u32 msg_ack(struct tipc_msg *m)
 221 {
 222         return msg_bits(m, 2, 16, 0xffff);
 223 }
 224
 225 static inline void msg_set_ack(struct tipc_msg *m, u32 n)
 226 {
 227         msg_set_bits(m, 2, 16, 0xffff, n);
 228 }
 229
 230 static inline u32 msg_seqno(struct tipc_msg *m)
 231 {
 232         return msg_bits(m, 2, 0, 0xffff);
 233 }
 234
 235 static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
 236 {
 237         msg_set_bits(m, 2, 0, 0xffff, n);
 238 }
 239
 240
 241 /*
 242  * Words 3-10
 243  */
 244
 245
 246 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 247 {
 248         msg_set_word(m, 3, a);
 249 }
 250
 251 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 252 {
 253         msg_set_word(m, 4, p);
 254 }
 255
 256 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 257 {
 258         msg_set_word(m, 5, p);
 259 }
 260
 261 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 262 {
 263         msg_set_word(m, 5, p);
 264 }
 265
 266 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 267 {
 268         msg_set_word(m, 6, a);
 269 }
 270
 271 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 272 {
 273         msg_set_word(m, 7, a);
 274 }
 275
 276 static inline int msg_is_dest(struct tipc_msg *m, u32 d)
 277 {
 278         return(msg_short(m) || (msg_destnode(m) == d));
 279 }
 280
 281 static inline u32 msg_routed(struct tipc_msg *m)
 282 {
 283         if (likely(msg_short(m)))
 284                 return 0;
 285         return(msg_destnode(m) ^ msg_orignode(m)) >> 11;
 286 }
 287
 288 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 289 {
 290         msg_set_word(m, 8, n);
 291 }
 292
 293 static inline u32 msg_transp_seqno(struct tipc_msg *m)
 294 {
 295         return msg_word(m, 8);
 296 }
 297
 298 static inline void msg_set_timestamp(struct tipc_msg *m, u32 n)
 299 {
 300         msg_set_word(m, 8, n);
 301 }
 302
 303 static inline u32 msg_timestamp(struct tipc_msg *m)
 304 {
 305         return msg_word(m, 8);
 306 }
 307
 308 static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n)
 309 {
 310         msg_set_word(m, 8, n);
 311 }
 312
 313 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 314 {
 315         msg_set_word(m, 9, n);
 316 }
 317
 318 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 319 {
 320         msg_set_namelower(m, n);
 321 }
 322
 323 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 324 {
 325         msg_set_word(m, 10, n);
 326 }
 327
 328 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 329 {
 330         return (struct tipc_msg *)msg_data(m);
 331 }
 332
 333 static inline void msg_expand(struct tipc_msg *m, u32 destnode)
 334 {
 335         if (!msg_short(m))
 336                 return;
 337         msg_set_hdr_sz(m, LONG_H_SIZE);
 338         msg_set_orignode(m, msg_prevnode(m));
 339         msg_set_destnode(m, destnode);
 340         memset(&m->hdr[8], 0, 12);
 341 }
 342
 343
 344
 345 /*
 346                 TIPC internal message header format, version 2
 347
 348        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
 349       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 350    w0:|vers |msg usr|hdr sz |n|resrv|            packet size          |
 351       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 352    w1:|m typ|rsv=0|   sequence gap    |       broadcast ack no        |
 353       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 354    w2:| link level ack no/bc_gap_from |     seq no / bcast_gap_to     |
 355       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 356    w3:|                       previous node                           |
 357       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 358    w4:|  next sent broadcast/fragm no | next sent pkt/ fragm msg no   |
 359       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 360    w5:|          session no           |rsv=0|r|berid|link prio|netpl|p|
 361       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 362    w6:|                      originating node                         |
 363       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 364    w7:|                      destination node                         |
 365       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 366    w8:|                   transport sequence number                   |
 367       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 368    w9:|   msg count / bcast tag       |       link tolerance          |
 369       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 370       \                                                               \
 371       /                     User Specific Data                        /
 372       \                                                               \
 373       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 374
 375       NB: CONN_MANAGER use data message format. LINK_CONFIG has own format.
 376 */
 377
 378 /*
 379  * Internal users
 380  */
 381
 382 #define  BCAST_PROTOCOL       5
 383 #define  MSG_BUNDLER          6
 384 #define  LINK_PROTOCOL        7
 385 #define  CONN_MANAGER         8
 386 #define  ROUTE_DISTRIBUTOR    9
 387 #define  CHANGEOVER_PROTOCOL  10
 388 #define  NAME_DISTRIBUTOR     11
 389 #define  MSG_FRAGMENTER       12
 390 #define  LINK_CONFIG          13
 391 #define  INT_H_SIZE           40
 392 #define  DSC_H_SIZE           40
 393
 394 /*
 395  *  Connection management protocol messages
 396  */
 397
 398 #define CONN_PROBE        0
 399 #define CONN_PROBE_REPLY  1
 400 #define CONN_ACK          2
 401
 402 /*
 403  * Name distributor messages
 404  */
 405
 406 #define PUBLICATION       0
 407 #define WITHDRAWAL        1
 408
 409
 410 /*
 411  * Word 1
 412  */
 413
 414 static inline u32 msg_seq_gap(struct tipc_msg *m)
 415 {
 416         return msg_bits(m, 1, 16, 0xff);
 417 }
 418
 419 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 420 {
 421         msg_set_bits(m, 1, 16, 0xff, n);
 422 }
 423
 424 static inline u32 msg_req_links(struct tipc_msg *m)
 425 {
 426         return msg_bits(m, 1, 16, 0xfff);
 427 }
 428
 429 static inline void msg_set_req_links(struct tipc_msg *m, u32 n)
 430 {
 431         msg_set_bits(m, 1, 16, 0xfff, n);
 432 }
 433
 434
 435 /*
 436  * Word 2
 437  */
 438
 439 static inline u32 msg_dest_domain(struct tipc_msg *m)
 440 {
 441         return msg_word(m, 2);
 442 }
 443
 444 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 445 {
 446         msg_set_word(m, 2, n);
 447 }
 448
 449 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 450 {
 451         return msg_bits(m, 2, 16, 0xffff);
 452 }
 453
 454 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 455 {
 456         msg_set_bits(m, 2, 16, 0xffff, n);
 457 }
 458
 459 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 460 {
 461         return msg_bits(m, 2, 0, 0xffff);
 462 }
 463
 464 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 465 {
 466         msg_set_bits(m, 2, 0, 0xffff, n);
 467 }
 468
 469
 470 /*
 471  * Word 4
 472  */
 473
 474 static inline u32 msg_last_bcast(struct tipc_msg *m)
 475 {
 476         return msg_bits(m, 4, 16, 0xffff);
 477 }
 478
 479 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 480 {
 481         msg_set_bits(m, 4, 16, 0xffff, n);
 482 }
 483
 484
 485 static inline u32 msg_fragm_no(struct tipc_msg *m)
 486 {
 487         return msg_bits(m, 4, 16, 0xffff);
 488 }
 489
 490 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 491 {
 492         msg_set_bits(m, 4, 16, 0xffff, n);
 493 }
 494
 495
 496 static inline u32 msg_next_sent(struct tipc_msg *m)
 497 {
 498         return msg_bits(m, 4, 0, 0xffff);
 499 }
 500
 501 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
 502 {
 503         msg_set_bits(m, 4, 0, 0xffff, n);
 504 }
 505
 506
 507 static inline u32 msg_long_msgno(struct tipc_msg *m)
 508 {
 509         return msg_bits(m, 4, 0, 0xffff);
 510 }
 511
 512 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 513 {
 514         msg_set_bits(m, 4, 0, 0xffff, n);
 515 }
 516
 517 static inline u32 msg_bc_netid(struct tipc_msg *m)
 518 {
 519         return msg_word(m, 4);
 520 }
 521
 522 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 523 {
 524         msg_set_word(m, 4, id);
 525 }
 526
 527 static inline u32 msg_link_selector(struct tipc_msg *m)
 528 {
 529         return msg_bits(m, 4, 0, 1);
 530 }
 531
 532 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
 533 {
 534         msg_set_bits(m, 4, 0, 1, (n & 1));
 535 }
 536
 537 /*
 538  * Word 5
 539  */
 540
 541 static inline u32 msg_session(struct tipc_msg *m)
 542 {
 543         return msg_bits(m, 5, 16, 0xffff);
 544 }
 545
 546 static inline void msg_set_session(struct tipc_msg *m, u32 n)
 547 {
 548         msg_set_bits(m, 5, 16, 0xffff, n);
 549 }
 550
 551 static inline u32 msg_probe(struct tipc_msg *m)
 552 {
 553         return msg_bits(m, 5, 0, 1);
 554 }
 555
 556 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 557 {
 558         msg_set_bits(m, 5, 0, 1, (val & 1));
 559 }
 560
 561 static inline char msg_net_plane(struct tipc_msg *m)
 562 {
 563         return msg_bits(m, 5, 1, 7) + 'A';
 564 }
 565
 566 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 567 {
 568         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 569 }
 570
 571 static inline u32 msg_linkprio(struct tipc_msg *m)
 572 {
 573         return msg_bits(m, 5, 4, 0x1f);
 574 }
 575
 576 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 577 {
 578         msg_set_bits(m, 5, 4, 0x1f, n);
 579 }
 580
 581 static inline u32 msg_bearer_id(struct tipc_msg *m)
 582 {
 583         return msg_bits(m, 5, 9, 0x7);
 584 }
 585
 586 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 587 {
 588         msg_set_bits(m, 5, 9, 0x7, n);
 589 }
 590
 591 static inline u32 msg_redundant_link(struct tipc_msg *m)
 592 {
 593         return msg_bits(m, 5, 12, 0x1);
 594 }
 595
 596 static inline void msg_set_redundant_link(struct tipc_msg *m)
 597 {
 598         msg_set_bits(m, 5, 12, 0x1, 1);
 599 }
 600
 601 static inline void msg_clear_redundant_link(struct tipc_msg *m)
 602 {
 603         msg_set_bits(m, 5, 12, 0x1, 0);
 604 }
 605
 606
 607 /*
 608  * Word 9
 609  */
 610
 611 static inline u32 msg_msgcnt(struct tipc_msg *m)
 612 {
 613         return msg_bits(m, 9, 16, 0xffff);
 614 }
 615
 616 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
 617 {
 618         msg_set_bits(m, 9, 16, 0xffff, n);
 619 }
 620
 621 static inline u32 msg_bcast_tag(struct tipc_msg *m)
 622 {
 623         return msg_bits(m, 9, 16, 0xffff);
 624 }
 625
 626 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
 627 {
 628         msg_set_bits(m, 9, 16, 0xffff, n);
 629 }
 630
 631 static inline u32 msg_max_pkt(struct tipc_msg *m)
 632 {
 633         return (msg_bits(m, 9, 16, 0xffff) * 4);
 634 }
 635
 636 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 637 {
 638         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 639 }
 640
 641 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 642 {
 643         return msg_bits(m, 9, 0, 0xffff);
 644 }
 645
 646 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 647 {
 648         msg_set_bits(m, 9, 0, 0xffff, n);
 649 }
 650
 651 /*
 652  * Routing table message data
 653  */
 654
 655
 656 static inline u32 msg_remote_node(struct tipc_msg *m)
 657 {
 658         return msg_word(m, msg_hdr_sz(m)/4);
 659 }
 660
 661 static inline void msg_set_remote_node(struct tipc_msg *m, u32 a)
 662 {
 663         msg_set_word(m, msg_hdr_sz(m)/4, a);
 664 }
 665
 666 static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos)
 667 {
 668         msg_data(m)[pos + 4] = 1;
 669 }
 670
 671 /*
 672  * Segmentation message types
 673  */
 674
 675 #define FIRST_FRAGMENT     0
 676 #define FRAGMENT           1
 677 #define LAST_FRAGMENT      2
 678
 679 /*
 680  * Link management protocol message types
 681  */
 682
 683 #define STATE_MSG       0
 684 #define RESET_MSG       1
 685 #define ACTIVATE_MSG    2
 686
 687 /*
 688  * Changeover tunnel message types
 689  */
 690 #define DUPLICATE_MSG    0
 691 #define ORIGINAL_MSG     1
 692
 693 /*
 694  * Routing table message types
 695  */
 696 #define EXT_ROUTING_TABLE    0
 697 #define LOCAL_ROUTING_TABLE  1
 698 #define SLAVE_ROUTING_TABLE  2
 699 #define ROUTE_ADDITION       3
 700 #define ROUTE_REMOVAL        4
 701
 702 /*
 703  * Config protocol message types
 704  */
 705
 706 #define DSC_REQ_MSG          0
 707 #define DSC_RESP_MSG         1
 708
 709 static inline u32 msg_tot_importance(struct tipc_msg *m)
 710 {
 711         if (likely(msg_isdata(m))) {
 712                 if (likely(msg_orignode(m) == tipc_own_addr))
 713                         return msg_importance(m);
 714                 return msg_importance(m) + 4;
 715         }
 716         if ((msg_user(m) == MSG_FRAGMENTER)  &&
 717             (msg_type(m) == FIRST_FRAGMENT))
 718                 return msg_importance(msg_get_wrapped(m));
 719         return msg_importance(m);
 720 }
 721
 722
 723 static inline void msg_init(struct tipc_msg *m, u32 user, u32 type,
 724                             u32 err, u32 hsize, u32 destnode)
 725 {
 726         memset(m, 0, hsize);
 727         msg_set_version(m);
 728         msg_set_user(m, user);
 729         msg_set_hdr_sz(m, hsize);
 730         msg_set_size(m, hsize);
 731         msg_set_prevnode(m, tipc_own_addr);
 732         msg_set_type(m, type);
 733         msg_set_errcode(m, err);
 734         if (!msg_short(m)) {
 735                 msg_set_orignode(m, tipc_own_addr);
 736                 msg_set_destnode(m, destnode);
 737         }
 738 }
 739
 740 /**
 741  * msg_calc_data_size - determine total data size for message
 742  */
 743
 744 static inline int msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
 745 {
 746         int dsz = 0;
 747         int i;
 748
 749         for (i = 0; i < num_sect; i++)
 750                 dsz += msg_sect[i].iov_len;
 751         return dsz;
 752 }
 753
 754 /**
 755  * msg_build - create message using specified header and data
 756  *
 757  * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
 758  *
 759  * Returns message data size or errno
 760  */
 761
 762 static inline int msg_build(struct tipc_msg *hdr,
 763                             struct iovec const *msg_sect, u32 num_sect,
 764                             int max_size, int usrmem, struct sk_buff** buf)
 765 {
 766         int dsz, sz, hsz, pos, res, cnt;
 767
 768         dsz = msg_calc_data_size(msg_sect, num_sect);
 769         if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
 770                 *buf = NULL;
 771                 return -EINVAL;
 772         }
 773
 774         pos = hsz = msg_hdr_sz(hdr);
 775         sz = hsz + dsz;
 776         msg_set_size(hdr, sz);
 777         if (unlikely(sz > max_size)) {
 778                 *buf = NULL;
 779                 return dsz;
 780         }
 781
 782         *buf = buf_acquire(sz);
 783         if (!(*buf))
 784                 return -ENOMEM;
 785         skb_copy_to_linear_data(*buf, hdr, hsz);
 786         for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
 787                 if (likely(usrmem))
 788                         res = !copy_from_user((*buf)->data + pos,
 789                                               msg_sect[cnt].iov_base,
 790                                               msg_sect[cnt].iov_len);
 791                 else
 792                         skb_copy_to_linear_data_offset(*buf, pos,
 793                                                        msg_sect[cnt].iov_base,
 794                                                        msg_sect[cnt].iov_len);
 795                 pos += msg_sect[cnt].iov_len;
 796         }
 797         if (likely(res))
 798                 return dsz;
 799
 800         buf_discard(*buf);
 801         *buf = NULL;
 802         return -EFAULT;
 803 }
 804
 805 static inline void msg_set_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
 806 {
 807         memcpy(&((int *)m)[5], a, sizeof(*a));
 808 }
 809
 810 static inline void msg_get_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
 811 {
 812         memcpy(a, &((int*)m)[5], sizeof(*a));
 813 }
 814
 815 #endif