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         void *handle;
  99         struct sk_buff *tail;
 100         bool validated;
 101         bool wakeup_pending;
 102         u16 chain_sz;
 103         u16 chain_imp;
 104         u16 ackers;
 105 };
 106
 107 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 108
 109 struct tipc_msg {
 110         __be32 hdr[15];
 111 };
 112
 113 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 114 {
 115         return (struct tipc_msg *)skb->data;
 116 }
 117
 118 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 119 {
 120         return ntohl(m->hdr[pos]);
 121 }
 122
 123 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 124 {
 125         m->hdr[w] = htonl(val);
 126 }
 127
 128 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 129 {
 130         return (msg_word(m, w) >> pos) & mask;
 131 }
 132
 133 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 134                                 u32 pos, u32 mask, u32 val)
 135 {
 136         val = (val & mask) << pos;
 137         mask = mask << pos;
 138         m->hdr[w] &= ~htonl(mask);
 139         m->hdr[w] |= htonl(val);
 140 }
 141
 142 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 143 {
 144         u32 temp = msg->hdr[a];
 145
 146         msg->hdr[a] = msg->hdr[b];
 147         msg->hdr[b] = temp;
 148 }
 149
 150 /*
 151  * Word 0
 152  */
 153 static inline u32 msg_version(struct tipc_msg *m)
 154 {
 155         return msg_bits(m, 0, 29, 7);
 156 }
 157
 158 static inline void msg_set_version(struct tipc_msg *m)
 159 {
 160         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 161 }
 162
 163 static inline u32 msg_user(struct tipc_msg *m)
 164 {
 165         return msg_bits(m, 0, 25, 0xf);
 166 }
 167
 168 static inline u32 msg_isdata(struct tipc_msg *m)
 169 {
 170         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 171 }
 172
 173 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 174 {
 175         msg_set_bits(m, 0, 25, 0xf, n);
 176 }
 177
 178 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 179 {
 180         return msg_bits(m, 0, 21, 0xf) << 2;
 181 }
 182
 183 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 184 {
 185         msg_set_bits(m, 0, 21, 0xf, n>>2);
 186 }
 187
 188 static inline u32 msg_size(struct tipc_msg *m)
 189 {
 190         return msg_bits(m, 0, 0, 0x1ffff);
 191 }
 192
 193 static inline u32 msg_data_sz(struct tipc_msg *m)
 194 {
 195         return msg_size(m) - msg_hdr_sz(m);
 196 }
 197
 198 static inline int msg_non_seq(struct tipc_msg *m)
 199 {
 200         return msg_bits(m, 0, 20, 1);
 201 }
 202
 203 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 204 {
 205         msg_set_bits(m, 0, 20, 1, n);
 206 }
 207
 208 static inline int msg_dest_droppable(struct tipc_msg *m)
 209 {
 210         return msg_bits(m, 0, 19, 1);
 211 }
 212
 213 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 214 {
 215         msg_set_bits(m, 0, 19, 1, d);
 216 }
 217
 218 static inline int msg_src_droppable(struct tipc_msg *m)
 219 {
 220         return msg_bits(m, 0, 18, 1);
 221 }
 222
 223 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 224 {
 225         msg_set_bits(m, 0, 18, 1, d);
 226 }
 227
 228 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 229 {
 230         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 231 }
 232
 233 static inline unchar *msg_data(struct tipc_msg *m)
 234 {
 235         return ((unchar *)m) + msg_hdr_sz(m);
 236 }
 237
 238 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 239 {
 240         return (struct tipc_msg *)msg_data(m);
 241 }
 242
 243 /*
 244  * Word 1
 245  */
 246 static inline u32 msg_type(struct tipc_msg *m)
 247 {
 248         return msg_bits(m, 1, 29, 0x7);
 249 }
 250
 251 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 252 {
 253         msg_set_bits(m, 1, 29, 0x7, n);
 254 }
 255
 256 static inline u32 msg_named(struct tipc_msg *m)
 257 {
 258         return msg_type(m) == TIPC_NAMED_MSG;
 259 }
 260
 261 static inline u32 msg_mcast(struct tipc_msg *m)
 262 {
 263         return msg_type(m) == TIPC_MCAST_MSG;
 264 }
 265
 266 static inline u32 msg_connected(struct tipc_msg *m)
 267 {
 268         return msg_type(m) == TIPC_CONN_MSG;
 269 }
 270
 271 static inline u32 msg_errcode(struct tipc_msg *m)
 272 {
 273         return msg_bits(m, 1, 25, 0xf);
 274 }
 275
 276 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 277 {
 278         msg_set_bits(m, 1, 25, 0xf, err);
 279 }
 280
 281 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 282 {
 283         return msg_bits(m, 1, 21, 0xf);
 284 }
 285
 286 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 287 {
 288         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 289 }
 290
 291 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 292 {
 293         msg_set_bits(m, 1, 21, 0xf, 0);
 294 }
 295
 296 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 297 {
 298         return msg_bits(m, 1, 19, 0x3);
 299 }
 300
 301 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 302 {
 303         msg_set_bits(m, 1, 19, 0x3, n);
 304 }
 305
 306 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 307 {
 308         return msg_bits(m, 1, 0, 0xffff);
 309 }
 310
 311 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 312 {
 313         msg_set_bits(m, 1, 0, 0xffff, n);
 314 }
 315
 316
 317 /*
 318  * Word 2
 319  */
 320 static inline u16 msg_ack(struct tipc_msg *m)
 321 {
 322         return msg_bits(m, 2, 16, 0xffff);
 323 }
 324
 325 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 326 {
 327         msg_set_bits(m, 2, 16, 0xffff, n);
 328 }
 329
 330 static inline u16 msg_seqno(struct tipc_msg *m)
 331 {
 332         return msg_bits(m, 2, 0, 0xffff);
 333 }
 334
 335 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 336 {
 337         msg_set_bits(m, 2, 0, 0xffff, n);
 338 }
 339
 340 /*
 341  * Words 3-10
 342  */
 343 static inline u32 msg_importance(struct tipc_msg *m)
 344 {
 345         int usr = msg_user(m);
 346
 347         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 348                 return usr;
 349         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 350                 return msg_bits(m, 9, 0, 0x7);
 351         return TIPC_SYSTEM_IMPORTANCE;
 352 }
 353
 354 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 355 {
 356         int usr = msg_user(m);
 357
 358         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 359                 msg_set_bits(m, 9, 0, 0x7, i);
 360         else if (i < TIPC_SYSTEM_IMPORTANCE)
 361                 msg_set_user(m, i);
 362         else
 363                 pr_warn("Trying to set illegal importance in message\n");
 364 }
 365
 366 static inline u32 msg_prevnode(struct tipc_msg *m)
 367 {
 368         return msg_word(m, 3);
 369 }
 370
 371 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 372 {
 373         msg_set_word(m, 3, a);
 374 }
 375
 376 static inline u32 msg_origport(struct tipc_msg *m)
 377 {
 378         if (msg_user(m) == MSG_FRAGMENTER)
 379                 m = msg_get_wrapped(m);
 380         return msg_word(m, 4);
 381 }
 382
 383 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 384 {
 385         msg_set_word(m, 4, p);
 386 }
 387
 388 static inline u32 msg_destport(struct tipc_msg *m)
 389 {
 390         return msg_word(m, 5);
 391 }
 392
 393 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 394 {
 395         msg_set_word(m, 5, p);
 396 }
 397
 398 static inline u32 msg_mc_netid(struct tipc_msg *m)
 399 {
 400         return msg_word(m, 5);
 401 }
 402
 403 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 404 {
 405         msg_set_word(m, 5, p);
 406 }
 407
 408 static inline int msg_short(struct tipc_msg *m)
 409 {
 410         return msg_hdr_sz(m) == SHORT_H_SIZE;
 411 }
 412
 413 static inline u32 msg_orignode(struct tipc_msg *m)
 414 {
 415         if (likely(msg_short(m)))
 416                 return msg_prevnode(m);
 417         return msg_word(m, 6);
 418 }
 419
 420 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 421 {
 422         msg_set_word(m, 6, a);
 423 }
 424
 425 static inline u32 msg_destnode(struct tipc_msg *m)
 426 {
 427         return msg_word(m, 7);
 428 }
 429
 430 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 431 {
 432         msg_set_word(m, 7, a);
 433 }
 434
 435 static inline u32 msg_nametype(struct tipc_msg *m)
 436 {
 437         return msg_word(m, 8);
 438 }
 439
 440 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 441 {
 442         msg_set_word(m, 8, n);
 443 }
 444
 445 static inline u32 msg_nameinst(struct tipc_msg *m)
 446 {
 447         return msg_word(m, 9);
 448 }
 449
 450 static inline u32 msg_namelower(struct tipc_msg *m)
 451 {
 452         return msg_nameinst(m);
 453 }
 454
 455 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 456 {
 457         msg_set_word(m, 9, n);
 458 }
 459
 460 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 461 {
 462         msg_set_namelower(m, n);
 463 }
 464
 465 static inline u32 msg_nameupper(struct tipc_msg *m)
 466 {
 467         return msg_word(m, 10);
 468 }
 469
 470 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 471 {
 472         msg_set_word(m, 10, n);
 473 }
 474
 475 /*
 476  * Constants and routines used to read and write TIPC internal message headers
 477  */
 478
 479 /*
 480  *  Connection management protocol message types
 481  */
 482 #define CONN_PROBE        0
 483 #define CONN_PROBE_REPLY  1
 484 #define CONN_ACK          2
 485
 486 /*
 487  * Name distributor message types
 488  */
 489 #define PUBLICATION       0
 490 #define WITHDRAWAL        1
 491
 492 /*
 493  * Segmentation message types
 494  */
 495 #define FIRST_FRAGMENT          0
 496 #define FRAGMENT                1
 497 #define LAST_FRAGMENT           2
 498
 499 /*
 500  * Link management protocol message types
 501  */
 502 #define STATE_MSG               0
 503 #define RESET_MSG               1
 504 #define ACTIVATE_MSG            2
 505
 506 /*
 507  * Changeover tunnel message types
 508  */
 509 #define SYNCH_MSG               0
 510 #define FAILOVER_MSG            1
 511
 512 /*
 513  * Config protocol message types
 514  */
 515 #define DSC_REQ_MSG             0
 516 #define DSC_RESP_MSG            1
 517
 518 /*
 519  * Word 1
 520  */
 521 static inline u32 msg_seq_gap(struct tipc_msg *m)
 522 {
 523         return msg_bits(m, 1, 16, 0x1fff);
 524 }
 525
 526 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 527 {
 528         msg_set_bits(m, 1, 16, 0x1fff, n);
 529 }
 530
 531 static inline u32 msg_node_sig(struct tipc_msg *m)
 532 {
 533         return msg_bits(m, 1, 0, 0xffff);
 534 }
 535
 536 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 537 {
 538         msg_set_bits(m, 1, 0, 0xffff, n);
 539 }
 540
 541 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 542 {
 543         return msg_bits(m, 1, 15, 0x1fff);
 544 }
 545
 546 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 547 {
 548         msg_set_bits(m, 1, 15, 0x1fff, n);
 549 }
 550
 551 /*
 552  * Word 2
 553  */
 554 static inline u32 msg_dest_domain(struct tipc_msg *m)
 555 {
 556         return msg_word(m, 2);
 557 }
 558
 559 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 560 {
 561         msg_set_word(m, 2, n);
 562 }
 563
 564 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 565 {
 566         return msg_bits(m, 2, 16, 0xffff);
 567 }
 568
 569 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 570 {
 571         msg_set_bits(m, 2, 16, 0xffff, n);
 572 }
 573
 574 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 575 {
 576         return msg_bits(m, 2, 0, 0xffff);
 577 }
 578
 579 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 580 {
 581         msg_set_bits(m, 2, 0, 0xffff, n);
 582 }
 583
 584
 585 /*
 586  * Word 4
 587  */
 588 static inline u32 msg_last_bcast(struct tipc_msg *m)
 589 {
 590         return msg_bits(m, 4, 16, 0xffff);
 591 }
 592
 593 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 594 {
 595         return msg_last_bcast(m) + 1;
 596 }
 597
 598 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 599 {
 600         msg_set_bits(m, 4, 16, 0xffff, n);
 601 }
 602
 603 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 604 {
 605         msg_set_bits(m, 4, 16, 0xffff, n);
 606 }
 607
 608
 609 static inline u16 msg_next_sent(struct tipc_msg *m)
 610 {
 611         return msg_bits(m, 4, 0, 0xffff);
 612 }
 613
 614 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 615 {
 616         msg_set_bits(m, 4, 0, 0xffff, n);
 617 }
 618
 619 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 620 {
 621         msg_set_bits(m, 4, 0, 0xffff, n);
 622 }
 623
 624 static inline u32 msg_bc_netid(struct tipc_msg *m)
 625 {
 626         return msg_word(m, 4);
 627 }
 628
 629 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 630 {
 631         msg_set_word(m, 4, id);
 632 }
 633
 634 static inline u32 msg_link_selector(struct tipc_msg *m)
 635 {
 636         return msg_bits(m, 4, 0, 1);
 637 }
 638
 639 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
 640 {
 641         msg_set_bits(m, 4, 0, 1, n);
 642 }
 643
 644 /*
 645  * Word 5
 646  */
 647 static inline u16 msg_session(struct tipc_msg *m)
 648 {
 649         return msg_bits(m, 5, 16, 0xffff);
 650 }
 651
 652 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 653 {
 654         msg_set_bits(m, 5, 16, 0xffff, n);
 655 }
 656
 657 static inline u32 msg_probe(struct tipc_msg *m)
 658 {
 659         return msg_bits(m, 5, 0, 1);
 660 }
 661
 662 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 663 {
 664         msg_set_bits(m, 5, 0, 1, val);
 665 }
 666
 667 static inline char msg_net_plane(struct tipc_msg *m)
 668 {
 669         return msg_bits(m, 5, 1, 7) + 'A';
 670 }
 671
 672 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 673 {
 674         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 675 }
 676
 677 static inline u32 msg_linkprio(struct tipc_msg *m)
 678 {
 679         return msg_bits(m, 5, 4, 0x1f);
 680 }
 681
 682 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 683 {
 684         msg_set_bits(m, 5, 4, 0x1f, n);
 685 }
 686
 687 static inline u32 msg_bearer_id(struct tipc_msg *m)
 688 {
 689         return msg_bits(m, 5, 9, 0x7);
 690 }
 691
 692 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 693 {
 694         msg_set_bits(m, 5, 9, 0x7, n);
 695 }
 696
 697 static inline u32 msg_redundant_link(struct tipc_msg *m)
 698 {
 699         return msg_bits(m, 5, 12, 0x1);
 700 }
 701
 702 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 703 {
 704         msg_set_bits(m, 5, 12, 0x1, r);
 705 }
 706
 707 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 708 {
 709         return msg_bits(m, 5, 13, 0x1);
 710 }
 711
 712 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 713 {
 714         msg_set_bits(m, 5, 13, 0x1, s);
 715 }
 716
 717 static inline char *msg_media_addr(struct tipc_msg *m)
 718 {
 719         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 720 }
 721
 722 /*
 723  * Word 9
 724  */
 725 static inline u16 msg_msgcnt(struct tipc_msg *m)
 726 {
 727         return msg_bits(m, 9, 16, 0xffff);
 728 }
 729
 730 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 731 {
 732         msg_set_bits(m, 9, 16, 0xffff, n);
 733 }
 734
 735 static inline u32 msg_conn_ack(struct tipc_msg *m)
 736 {
 737         return msg_bits(m, 9, 16, 0xffff);
 738 }
 739
 740 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 741 {
 742         msg_set_bits(m, 9, 16, 0xffff, n);
 743 }
 744
 745 static inline u32 msg_adv_win(struct tipc_msg *m)
 746 {
 747         return msg_bits(m, 9, 0, 0xffff);
 748 }
 749
 750 static inline void msg_set_adv_win(struct tipc_msg *m, u32 n)
 751 {
 752         msg_set_bits(m, 9, 0, 0xffff, n);
 753 }
 754
 755 static inline u32 msg_max_pkt(struct tipc_msg *m)
 756 {
 757         return msg_bits(m, 9, 16, 0xffff) * 4;
 758 }
 759
 760 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 761 {
 762         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 763 }
 764
 765 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 766 {
 767         return msg_bits(m, 9, 0, 0xffff);
 768 }
 769
 770 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 771 {
 772         msg_set_bits(m, 9, 0, 0xffff, n);
 773 }
 774
 775 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
 776 {
 777         if (likely(msg_user(m) != LINK_PROTOCOL))
 778                 return true;
 779         if (msg_type(m) == STATE_MSG)
 780                 return true;
 781         return false;
 782 }
 783
 784 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
 785 {
 786         if (msg_peer_link_is_up(m))
 787                 return true;
 788         return msg_redundant_link(m);
 789 }
 790
 791 static inline bool msg_is_reset(struct tipc_msg *hdr)
 792 {
 793         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
 794 }
 795
 796 struct sk_buff *tipc_buf_acquire(u32 size);
 797 bool tipc_msg_validate(struct sk_buff *skb);
 798 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
 799 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 800                    u32 hsize, u32 destnode);
 801 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 802                                 uint data_sz, u32 dnode, u32 onode,
 803                                 u32 dport, u32 oport, int errcode);
 804 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 805 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
 806 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
 807                           u32 mtu, u32 dnode);
 808 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 809 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 810                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 811 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
 812 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
 813 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
 814                              struct sk_buff *skb);
 815
 816 static inline u16 buf_seqno(struct sk_buff *skb)
 817 {
 818         return msg_seqno(buf_msg(skb));
 819 }
 820
 821 /* tipc_skb_peek(): peek and reserve first buffer in list
 822  * @list: list to be peeked in
 823  * Returns pointer to first buffer in list, if any
 824  */
 825 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
 826                                             spinlock_t *lock)
 827 {
 828         struct sk_buff *skb;
 829
 830         spin_lock_bh(lock);
 831         skb = skb_peek(list);
 832         if (skb)
 833                 skb_get(skb);
 834         spin_unlock_bh(lock);
 835         return skb;
 836 }
 837
 838 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
 839  *                       up to and including 'filter'.
 840  * Note: ignoring previously tried destinations minimizes the risk of
 841  *       contention on the socket lock
 842  * @list: list to be peeked in
 843  * @filter: last destination to be ignored from search
 844  * Returns a destination port number, of applicable.
 845  */
 846 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
 847 {
 848         struct sk_buff *skb;
 849         u32 dport = 0;
 850         bool ignore = true;
 851
 852         spin_lock_bh(&list->lock);
 853         skb_queue_walk(list, skb) {
 854                 dport = msg_destport(buf_msg(skb));
 855                 if (!filter || skb_queue_is_last(list, skb))
 856                         break;
 857                 if (dport == filter)
 858                         ignore = false;
 859                 else if (!ignore)
 860                         break;
 861         }
 862         spin_unlock_bh(&list->lock);
 863         return dport;
 864 }
 865
 866 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
 867  * @list: list to be unlinked from
 868  * @dport: selection criteria for buffer to unlink
 869  */
 870 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
 871                                                u32 dport)
 872 {
 873         struct sk_buff *_skb, *tmp, *skb = NULL;
 874
 875         spin_lock_bh(&list->lock);
 876         skb_queue_walk_safe(list, _skb, tmp) {
 877                 if (msg_destport(buf_msg(_skb)) == dport) {
 878                         __skb_unlink(_skb, list);
 879                         skb = _skb;
 880                         break;
 881                 }
 882         }
 883         spin_unlock_bh(&list->lock);
 884         return skb;
 885 }
 886
 887 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
 888  * @list: the new list to append. Not lock protected
 889  * @head: target list. Lock protected.
 890  */
 891 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
 892                                               struct sk_buff_head *head)
 893 {
 894         spin_lock_bh(&head->lock);
 895         skb_queue_splice_tail(list, head);
 896         spin_unlock_bh(&head->lock);
 897 }
 898
 899 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
 900  * @list: the new list to add. Lock protected. Will be reinitialized
 901  * @head: target list. Lock protected.
 902  */
 903 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
 904                                                    struct sk_buff_head *head)
 905 {
 906         struct sk_buff_head tmp;
 907
 908         __skb_queue_head_init(&tmp);
 909
 910         spin_lock_bh(&list->lock);
 911         skb_queue_splice_tail_init(list, &tmp);
 912         spin_unlock_bh(&list->lock);
 913         tipc_skb_queue_splice_tail(&tmp, head);
 914 }
 915
 916 #endif