net/tipc/msg.h

   1 /*
   2  * net/tipc/msg.h: Include file for TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2007, 2014-2017 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 #define TIPC_GRP_MEMBER_EVT     4
  69 #define TIPC_GRP_BCAST_MSG      5
  70 #define TIPC_GRP_UCAST_MSG      6
  71
  72 /*
  73  * Internal message users
  74  */
  75 #define  BCAST_PROTOCOL       5
  76 #define  MSG_BUNDLER          6
  77 #define  LINK_PROTOCOL        7
  78 #define  CONN_MANAGER         8
  79 #define  GROUP_PROTOCOL       9
  80 #define  TUNNEL_PROTOCOL      10
  81 #define  NAME_DISTRIBUTOR     11
  82 #define  MSG_FRAGMENTER       12
  83 #define  LINK_CONFIG          13
  84 #define  SOCK_WAKEUP          14       /* pseudo user */
  85 #define  TOP_SRV              15       /* pseudo user */
  86
  87 /*
  88  * Message header sizes
  89  */
  90 #define SHORT_H_SIZE              24    /* In-cluster basic payload message */
  91 #define BASIC_H_SIZE              32    /* Basic payload message */
  92 #define NAMED_H_SIZE              40    /* Named payload message */
  93 #define MCAST_H_SIZE              44    /* Multicast payload message */
  94 #define GROUP_H_SIZE              44    /* Group payload message */
  95 #define INT_H_SIZE                40    /* Internal messages */
  96 #define MIN_H_SIZE                24    /* Smallest legal TIPC header size */
  97 #define MAX_H_SIZE                60    /* Largest possible TIPC header size */
  98
  99 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
 100
 101 #define TIPC_MEDIA_INFO_OFFSET  5
 102
 103 struct tipc_skb_cb {
 104         u32 bytes_read;
 105         u32 orig_member;
 106         struct sk_buff *tail;
 107         bool validated;
 108         u16 chain_imp;
 109         u16 ackers;
 110 };
 111
 112 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 113
 114 struct tipc_msg {
 115         __be32 hdr[15];
 116 };
 117
 118 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 119 {
 120         return (struct tipc_msg *)skb->data;
 121 }
 122
 123 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 124 {
 125         return ntohl(m->hdr[pos]);
 126 }
 127
 128 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 129 {
 130         m->hdr[w] = htonl(val);
 131 }
 132
 133 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 134 {
 135         return (msg_word(m, w) >> pos) & mask;
 136 }
 137
 138 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 139                                 u32 pos, u32 mask, u32 val)
 140 {
 141         val = (val & mask) << pos;
 142         mask = mask << pos;
 143         m->hdr[w] &= ~htonl(mask);
 144         m->hdr[w] |= htonl(val);
 145 }
 146
 147 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 148 {
 149         u32 temp = msg->hdr[a];
 150
 151         msg->hdr[a] = msg->hdr[b];
 152         msg->hdr[b] = temp;
 153 }
 154
 155 /*
 156  * Word 0
 157  */
 158 static inline u32 msg_version(struct tipc_msg *m)
 159 {
 160         return msg_bits(m, 0, 29, 7);
 161 }
 162
 163 static inline void msg_set_version(struct tipc_msg *m)
 164 {
 165         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 166 }
 167
 168 static inline u32 msg_user(struct tipc_msg *m)
 169 {
 170         return msg_bits(m, 0, 25, 0xf);
 171 }
 172
 173 static inline u32 msg_isdata(struct tipc_msg *m)
 174 {
 175         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 176 }
 177
 178 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 179 {
 180         msg_set_bits(m, 0, 25, 0xf, n);
 181 }
 182
 183 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 184 {
 185         return msg_bits(m, 0, 21, 0xf) << 2;
 186 }
 187
 188 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 189 {
 190         msg_set_bits(m, 0, 21, 0xf, n>>2);
 191 }
 192
 193 static inline u32 msg_size(struct tipc_msg *m)
 194 {
 195         return msg_bits(m, 0, 0, 0x1ffff);
 196 }
 197
 198 static inline u32 msg_data_sz(struct tipc_msg *m)
 199 {
 200         return msg_size(m) - msg_hdr_sz(m);
 201 }
 202
 203 static inline int msg_non_seq(struct tipc_msg *m)
 204 {
 205         return msg_bits(m, 0, 20, 1);
 206 }
 207
 208 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 209 {
 210         msg_set_bits(m, 0, 20, 1, n);
 211 }
 212
 213 static inline int msg_dest_droppable(struct tipc_msg *m)
 214 {
 215         return msg_bits(m, 0, 19, 1);
 216 }
 217
 218 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 219 {
 220         msg_set_bits(m, 0, 19, 1, d);
 221 }
 222
 223 static inline int msg_src_droppable(struct tipc_msg *m)
 224 {
 225         return msg_bits(m, 0, 18, 1);
 226 }
 227
 228 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 229 {
 230         msg_set_bits(m, 0, 18, 1, d);
 231 }
 232
 233 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 234 {
 235         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 236 }
 237
 238 static inline unchar *msg_data(struct tipc_msg *m)
 239 {
 240         return ((unchar *)m) + msg_hdr_sz(m);
 241 }
 242
 243 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 244 {
 245         return (struct tipc_msg *)msg_data(m);
 246 }
 247
 248 /*
 249  * Word 1
 250  */
 251 static inline u32 msg_type(struct tipc_msg *m)
 252 {
 253         return msg_bits(m, 1, 29, 0x7);
 254 }
 255
 256 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 257 {
 258         msg_set_bits(m, 1, 29, 0x7, n);
 259 }
 260
 261 static inline int msg_in_group(struct tipc_msg *m)
 262 {
 263         int mtyp = msg_type(m);
 264
 265         return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
 266 }
 267
 268 static inline bool msg_is_grp_evt(struct tipc_msg *m)
 269 {
 270         return msg_type(m) == TIPC_GRP_MEMBER_EVT;
 271 }
 272
 273 static inline u32 msg_named(struct tipc_msg *m)
 274 {
 275         return msg_type(m) == TIPC_NAMED_MSG;
 276 }
 277
 278 static inline u32 msg_mcast(struct tipc_msg *m)
 279 {
 280         int mtyp = msg_type(m);
 281
 282         return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG));
 283 }
 284
 285 static inline u32 msg_connected(struct tipc_msg *m)
 286 {
 287         return msg_type(m) == TIPC_CONN_MSG;
 288 }
 289
 290 static inline u32 msg_errcode(struct tipc_msg *m)
 291 {
 292         return msg_bits(m, 1, 25, 0xf);
 293 }
 294
 295 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 296 {
 297         msg_set_bits(m, 1, 25, 0xf, err);
 298 }
 299
 300 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 301 {
 302         return msg_bits(m, 1, 21, 0xf);
 303 }
 304
 305 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 306 {
 307         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 308 }
 309
 310 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 311 {
 312         msg_set_bits(m, 1, 21, 0xf, 0);
 313 }
 314
 315 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 316 {
 317         return msg_bits(m, 1, 19, 0x3);
 318 }
 319
 320 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 321 {
 322         msg_set_bits(m, 1, 19, 0x3, n);
 323 }
 324
 325 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 326 {
 327         return msg_bits(m, 1, 0, 0xffff);
 328 }
 329
 330 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 331 {
 332         msg_set_bits(m, 1, 0, 0xffff, n);
 333 }
 334
 335
 336 /*
 337  * Word 2
 338  */
 339 static inline u16 msg_ack(struct tipc_msg *m)
 340 {
 341         return msg_bits(m, 2, 16, 0xffff);
 342 }
 343
 344 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 345 {
 346         msg_set_bits(m, 2, 16, 0xffff, n);
 347 }
 348
 349 static inline u16 msg_seqno(struct tipc_msg *m)
 350 {
 351         return msg_bits(m, 2, 0, 0xffff);
 352 }
 353
 354 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 355 {
 356         msg_set_bits(m, 2, 0, 0xffff, n);
 357 }
 358
 359 /*
 360  * Words 3-10
 361  */
 362 static inline u32 msg_importance(struct tipc_msg *m)
 363 {
 364         int usr = msg_user(m);
 365
 366         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 367                 return usr;
 368         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 369                 return msg_bits(m, 9, 0, 0x7);
 370         return TIPC_SYSTEM_IMPORTANCE;
 371 }
 372
 373 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 374 {
 375         int usr = msg_user(m);
 376
 377         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 378                 msg_set_bits(m, 9, 0, 0x7, i);
 379         else if (i < TIPC_SYSTEM_IMPORTANCE)
 380                 msg_set_user(m, i);
 381         else
 382                 pr_warn("Trying to set illegal importance in message\n");
 383 }
 384
 385 static inline u32 msg_prevnode(struct tipc_msg *m)
 386 {
 387         return msg_word(m, 3);
 388 }
 389
 390 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 391 {
 392         msg_set_word(m, 3, a);
 393 }
 394
 395 static inline u32 msg_origport(struct tipc_msg *m)
 396 {
 397         if (msg_user(m) == MSG_FRAGMENTER)
 398                 m = msg_get_wrapped(m);
 399         return msg_word(m, 4);
 400 }
 401
 402 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 403 {
 404         msg_set_word(m, 4, p);
 405 }
 406
 407 static inline u32 msg_destport(struct tipc_msg *m)
 408 {
 409         return msg_word(m, 5);
 410 }
 411
 412 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 413 {
 414         msg_set_word(m, 5, p);
 415 }
 416
 417 static inline u32 msg_mc_netid(struct tipc_msg *m)
 418 {
 419         return msg_word(m, 5);
 420 }
 421
 422 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 423 {
 424         msg_set_word(m, 5, p);
 425 }
 426
 427 static inline int msg_short(struct tipc_msg *m)
 428 {
 429         return msg_hdr_sz(m) == SHORT_H_SIZE;
 430 }
 431
 432 static inline u32 msg_orignode(struct tipc_msg *m)
 433 {
 434         if (likely(msg_short(m)))
 435                 return msg_prevnode(m);
 436         return msg_word(m, 6);
 437 }
 438
 439 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 440 {
 441         msg_set_word(m, 6, a);
 442 }
 443
 444 static inline u32 msg_destnode(struct tipc_msg *m)
 445 {
 446         return msg_word(m, 7);
 447 }
 448
 449 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 450 {
 451         msg_set_word(m, 7, a);
 452 }
 453
 454 static inline u32 msg_nametype(struct tipc_msg *m)
 455 {
 456         return msg_word(m, 8);
 457 }
 458
 459 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 460 {
 461         msg_set_word(m, 8, n);
 462 }
 463
 464 static inline u32 msg_nameinst(struct tipc_msg *m)
 465 {
 466         return msg_word(m, 9);
 467 }
 468
 469 static inline u32 msg_namelower(struct tipc_msg *m)
 470 {
 471         return msg_nameinst(m);
 472 }
 473
 474 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 475 {
 476         msg_set_word(m, 9, n);
 477 }
 478
 479 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 480 {
 481         msg_set_namelower(m, n);
 482 }
 483
 484 static inline u32 msg_nameupper(struct tipc_msg *m)
 485 {
 486         return msg_word(m, 10);
 487 }
 488
 489 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 490 {
 491         msg_set_word(m, 10, n);
 492 }
 493
 494 /*
 495  * Constants and routines used to read and write TIPC internal message headers
 496  */
 497
 498 /*
 499  *  Connection management protocol message types
 500  */
 501 #define CONN_PROBE        0
 502 #define CONN_PROBE_REPLY  1
 503 #define CONN_ACK          2
 504
 505 /*
 506  * Name distributor message types
 507  */
 508 #define PUBLICATION       0
 509 #define WITHDRAWAL        1
 510
 511 /*
 512  * Segmentation message types
 513  */
 514 #define FIRST_FRAGMENT          0
 515 #define FRAGMENT                1
 516 #define LAST_FRAGMENT           2
 517
 518 /*
 519  * Link management protocol message types
 520  */
 521 #define STATE_MSG               0
 522 #define RESET_MSG               1
 523 #define ACTIVATE_MSG            2
 524
 525 /*
 526  * Changeover tunnel message types
 527  */
 528 #define SYNCH_MSG               0
 529 #define FAILOVER_MSG            1
 530
 531 /*
 532  * Config protocol message types
 533  */
 534 #define DSC_REQ_MSG             0
 535 #define DSC_RESP_MSG            1
 536
 537 /*
 538  * Group protocol message types
 539  */
 540 #define GRP_JOIN_MSG         0
 541 #define GRP_LEAVE_MSG        1
 542 #define GRP_ADV_MSG          2
 543
 544 /*
 545  * Word 1
 546  */
 547 static inline u32 msg_seq_gap(struct tipc_msg *m)
 548 {
 549         return msg_bits(m, 1, 16, 0x1fff);
 550 }
 551
 552 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 553 {
 554         msg_set_bits(m, 1, 16, 0x1fff, n);
 555 }
 556
 557 static inline u32 msg_node_sig(struct tipc_msg *m)
 558 {
 559         return msg_bits(m, 1, 0, 0xffff);
 560 }
 561
 562 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 563 {
 564         msg_set_bits(m, 1, 0, 0xffff, n);
 565 }
 566
 567 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 568 {
 569         return msg_bits(m, 1, 15, 0x1fff);
 570 }
 571
 572 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 573 {
 574         msg_set_bits(m, 1, 15, 0x1fff, n);
 575 }
 576
 577 /*
 578  * Word 2
 579  */
 580 static inline u32 msg_dest_domain(struct tipc_msg *m)
 581 {
 582         return msg_word(m, 2);
 583 }
 584
 585 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 586 {
 587         msg_set_word(m, 2, n);
 588 }
 589
 590 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 591 {
 592         return msg_bits(m, 2, 16, 0xffff);
 593 }
 594
 595 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 596 {
 597         msg_set_bits(m, 2, 16, 0xffff, n);
 598 }
 599
 600 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 601 {
 602         return msg_bits(m, 2, 0, 0xffff);
 603 }
 604
 605 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 606 {
 607         msg_set_bits(m, 2, 0, 0xffff, n);
 608 }
 609
 610
 611 /*
 612  * Word 4
 613  */
 614 static inline u32 msg_last_bcast(struct tipc_msg *m)
 615 {
 616         return msg_bits(m, 4, 16, 0xffff);
 617 }
 618
 619 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 620 {
 621         return msg_last_bcast(m) + 1;
 622 }
 623
 624 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 625 {
 626         msg_set_bits(m, 4, 16, 0xffff, n);
 627 }
 628
 629 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 630 {
 631         msg_set_bits(m, 4, 16, 0xffff, n);
 632 }
 633
 634
 635 static inline u16 msg_next_sent(struct tipc_msg *m)
 636 {
 637         return msg_bits(m, 4, 0, 0xffff);
 638 }
 639
 640 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 641 {
 642         msg_set_bits(m, 4, 0, 0xffff, n);
 643 }
 644
 645 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 646 {
 647         msg_set_bits(m, 4, 0, 0xffff, n);
 648 }
 649
 650 static inline u32 msg_bc_netid(struct tipc_msg *m)
 651 {
 652         return msg_word(m, 4);
 653 }
 654
 655 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 656 {
 657         msg_set_word(m, 4, id);
 658 }
 659
 660 static inline u32 msg_link_selector(struct tipc_msg *m)
 661 {
 662         if (msg_user(m) == MSG_FRAGMENTER)
 663                 m = (void *)msg_data(m);
 664         return msg_bits(m, 4, 0, 1);
 665 }
 666
 667 /*
 668  * Word 5
 669  */
 670 static inline u16 msg_session(struct tipc_msg *m)
 671 {
 672         return msg_bits(m, 5, 16, 0xffff);
 673 }
 674
 675 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 676 {
 677         msg_set_bits(m, 5, 16, 0xffff, n);
 678 }
 679
 680 static inline u32 msg_probe(struct tipc_msg *m)
 681 {
 682         return msg_bits(m, 5, 0, 1);
 683 }
 684
 685 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 686 {
 687         msg_set_bits(m, 5, 0, 1, val);
 688 }
 689
 690 static inline char msg_net_plane(struct tipc_msg *m)
 691 {
 692         return msg_bits(m, 5, 1, 7) + 'A';
 693 }
 694
 695 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 696 {
 697         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 698 }
 699
 700 static inline u32 msg_linkprio(struct tipc_msg *m)
 701 {
 702         return msg_bits(m, 5, 4, 0x1f);
 703 }
 704
 705 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 706 {
 707         msg_set_bits(m, 5, 4, 0x1f, n);
 708 }
 709
 710 static inline u32 msg_bearer_id(struct tipc_msg *m)
 711 {
 712         return msg_bits(m, 5, 9, 0x7);
 713 }
 714
 715 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 716 {
 717         msg_set_bits(m, 5, 9, 0x7, n);
 718 }
 719
 720 static inline u32 msg_redundant_link(struct tipc_msg *m)
 721 {
 722         return msg_bits(m, 5, 12, 0x1);
 723 }
 724
 725 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 726 {
 727         msg_set_bits(m, 5, 12, 0x1, r);
 728 }
 729
 730 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 731 {
 732         return msg_bits(m, 5, 13, 0x1);
 733 }
 734
 735 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 736 {
 737         msg_set_bits(m, 5, 13, 0x1, s);
 738 }
 739
 740 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
 741 {
 742         switch (msg_user(m)) {
 743         case BCAST_PROTOCOL:
 744         case NAME_DISTRIBUTOR:
 745         case LINK_PROTOCOL:
 746                 return msg_bits(m, 5, 14, 0x1);
 747         default:
 748                 return false;
 749         }
 750 }
 751
 752 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
 753 {
 754         msg_set_bits(m, 5, 14, 0x1, invalid);
 755 }
 756
 757 static inline char *msg_media_addr(struct tipc_msg *m)
 758 {
 759         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 760 }
 761
 762 static inline u32 msg_bc_gap(struct tipc_msg *m)
 763 {
 764         return msg_bits(m, 8, 0, 0x3ff);
 765 }
 766
 767 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
 768 {
 769         msg_set_bits(m, 8, 0, 0x3ff, n);
 770 }
 771
 772 /*
 773  * Word 9
 774  */
 775 static inline u16 msg_msgcnt(struct tipc_msg *m)
 776 {
 777         return msg_bits(m, 9, 16, 0xffff);
 778 }
 779
 780 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 781 {
 782         msg_set_bits(m, 9, 16, 0xffff, n);
 783 }
 784
 785 static inline u32 msg_conn_ack(struct tipc_msg *m)
 786 {
 787         return msg_bits(m, 9, 16, 0xffff);
 788 }
 789
 790 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 791 {
 792         msg_set_bits(m, 9, 16, 0xffff, n);
 793 }
 794
 795 static inline u16 msg_adv_win(struct tipc_msg *m)
 796 {
 797         return msg_bits(m, 9, 0, 0xffff);
 798 }
 799
 800 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
 801 {
 802         msg_set_bits(m, 9, 0, 0xffff, n);
 803 }
 804
 805 static inline u32 msg_max_pkt(struct tipc_msg *m)
 806 {
 807         return msg_bits(m, 9, 16, 0xffff) * 4;
 808 }
 809
 810 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 811 {
 812         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 813 }
 814
 815 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 816 {
 817         return msg_bits(m, 9, 0, 0xffff);
 818 }
 819
 820 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 821 {
 822         msg_set_bits(m, 9, 0, 0xffff, n);
 823 }
 824
 825 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
 826 {
 827         return msg_bits(m, 9, 16, 0xffff);
 828 }
 829
 830 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
 831 {
 832         msg_set_bits(m, 9, 16, 0xffff, n);
 833 }
 834
 835 /* Word 10
 836  */
 837 static inline u16 msg_grp_evt(struct tipc_msg *m)
 838 {
 839         return msg_bits(m, 10, 0, 0x3);
 840 }
 841
 842 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
 843 {
 844         msg_set_bits(m, 10, 0, 0x3, n);
 845 }
 846
 847 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
 848 {
 849         return msg_bits(m, 10, 16, 0xffff);
 850 }
 851
 852 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
 853 {
 854         msg_set_bits(m, 10, 16, 0xffff, n);
 855 }
 856
 857 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
 858 {
 859         if (likely(msg_user(m) != LINK_PROTOCOL))
 860                 return true;
 861         if (msg_type(m) == STATE_MSG)
 862                 return true;
 863         return false;
 864 }
 865
 866 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
 867 {
 868         if (msg_peer_link_is_up(m))
 869                 return true;
 870         return msg_redundant_link(m);
 871 }
 872
 873 static inline bool msg_is_reset(struct tipc_msg *hdr)
 874 {
 875         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
 876 }
 877
 878 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
 879 bool tipc_msg_validate(struct sk_buff *skb);
 880 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
 881 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
 882                      struct sk_buff_head *xmitq);
 883 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 884                    u32 hsize, u32 destnode);
 885 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 886                                 uint data_sz, u32 dnode, u32 onode,
 887                                 u32 dport, u32 oport, int errcode);
 888 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 889 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
 890 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
 891                           u32 mtu, u32 dnode);
 892 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 893 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 894                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 895 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
 896 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
 897 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
 898                         struct sk_buff_head *cpy);
 899 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
 900                              struct sk_buff *skb);
 901
 902 static inline u16 buf_seqno(struct sk_buff *skb)
 903 {
 904         return msg_seqno(buf_msg(skb));
 905 }
 906
 907 /* tipc_skb_peek(): peek and reserve first buffer in list
 908  * @list: list to be peeked in
 909  * Returns pointer to first buffer in list, if any
 910  */
 911 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
 912                                             spinlock_t *lock)
 913 {
 914         struct sk_buff *skb;
 915
 916         spin_lock_bh(lock);
 917         skb = skb_peek(list);
 918         if (skb)
 919                 skb_get(skb);
 920         spin_unlock_bh(lock);
 921         return skb;
 922 }
 923
 924 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
 925  *                       up to and including 'filter'.
 926  * Note: ignoring previously tried destinations minimizes the risk of
 927  *       contention on the socket lock
 928  * @list: list to be peeked in
 929  * @filter: last destination to be ignored from search
 930  * Returns a destination port number, of applicable.
 931  */
 932 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
 933 {
 934         struct sk_buff *skb;
 935         u32 dport = 0;
 936         bool ignore = true;
 937
 938         spin_lock_bh(&list->lock);
 939         skb_queue_walk(list, skb) {
 940                 dport = msg_destport(buf_msg(skb));
 941                 if (!filter || skb_queue_is_last(list, skb))
 942                         break;
 943                 if (dport == filter)
 944                         ignore = false;
 945                 else if (!ignore)
 946                         break;
 947         }
 948         spin_unlock_bh(&list->lock);
 949         return dport;
 950 }
 951
 952 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
 953  * @list: list to be unlinked from
 954  * @dport: selection criteria for buffer to unlink
 955  */
 956 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
 957                                                u32 dport)
 958 {
 959         struct sk_buff *_skb, *tmp, *skb = NULL;
 960
 961         spin_lock_bh(&list->lock);
 962         skb_queue_walk_safe(list, _skb, tmp) {
 963                 if (msg_destport(buf_msg(_skb)) == dport) {
 964                         __skb_unlink(_skb, list);
 965                         skb = _skb;
 966                         break;
 967                 }
 968         }
 969         spin_unlock_bh(&list->lock);
 970         return skb;
 971 }
 972
 973 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
 974  * @list: the new list to append. Not lock protected
 975  * @head: target list. Lock protected.
 976  */
 977 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
 978                                               struct sk_buff_head *head)
 979 {
 980         spin_lock_bh(&head->lock);
 981         skb_queue_splice_tail(list, head);
 982         spin_unlock_bh(&head->lock);
 983 }
 984
 985 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
 986  * @list: the new list to add. Lock protected. Will be reinitialized
 987  * @head: target list. Lock protected.
 988  */
 989 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
 990                                                    struct sk_buff_head *head)
 991 {
 992         struct sk_buff_head tmp;
 993
 994         __skb_queue_head_init(&tmp);
 995
 996         spin_lock_bh(&list->lock);
 997         skb_queue_splice_tail_init(list, &tmp);
 998         spin_unlock_bh(&list->lock);
 999         tipc_skb_queue_splice_tail(&tmp, head);
1000 }
1001
1002 #endif