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_MCAST_MSG      6
  71 #define TIPC_GRP_UCAST_MSG      7
  72
  73 /*
  74  * Internal message users
  75  */
  76 #define  BCAST_PROTOCOL       5
  77 #define  MSG_BUNDLER          6
  78 #define  LINK_PROTOCOL        7
  79 #define  CONN_MANAGER         8
  80 #define  GROUP_PROTOCOL       9
  81 #define  TUNNEL_PROTOCOL      10
  82 #define  NAME_DISTRIBUTOR     11
  83 #define  MSG_FRAGMENTER       12
  84 #define  LINK_CONFIG          13
  85 #define  SOCK_WAKEUP          14       /* pseudo user */
  86 #define  TOP_SRV              15       /* pseudo user */
  87
  88 /*
  89  * Message header sizes
  90  */
  91 #define SHORT_H_SIZE              24    /* In-cluster basic payload message */
  92 #define BASIC_H_SIZE              32    /* Basic payload message */
  93 #define NAMED_H_SIZE              40    /* Named payload message */
  94 #define MCAST_H_SIZE              44    /* Multicast payload message */
  95 #define GROUP_H_SIZE              44    /* Group payload message */
  96 #define INT_H_SIZE                40    /* Internal messages */
  97 #define MIN_H_SIZE                24    /* Smallest legal TIPC header size */
  98 #define MAX_H_SIZE                60    /* Largest possible TIPC header size */
  99
 100 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
 101 #define FB_MTU                  3744
 102 #define TIPC_MEDIA_INFO_OFFSET  5
 103
 104 struct tipc_skb_cb {
 105         u32 bytes_read;
 106         u32 orig_member;
 107         struct sk_buff *tail;
 108         bool validated;
 109         u16 chain_imp;
 110         u16 ackers;
 111 };
 112
 113 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 114
 115 struct tipc_msg {
 116         __be32 hdr[15];
 117 };
 118
 119 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 120 {
 121         return (struct tipc_msg *)skb->data;
 122 }
 123
 124 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 125 {
 126         return ntohl(m->hdr[pos]);
 127 }
 128
 129 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 130 {
 131         m->hdr[w] = htonl(val);
 132 }
 133
 134 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 135 {
 136         return (msg_word(m, w) >> pos) & mask;
 137 }
 138
 139 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 140                                 u32 pos, u32 mask, u32 val)
 141 {
 142         val = (val & mask) << pos;
 143         mask = mask << pos;
 144         m->hdr[w] &= ~htonl(mask);
 145         m->hdr[w] |= htonl(val);
 146 }
 147
 148 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 149 {
 150         u32 temp = msg->hdr[a];
 151
 152         msg->hdr[a] = msg->hdr[b];
 153         msg->hdr[b] = temp;
 154 }
 155
 156 /*
 157  * Word 0
 158  */
 159 static inline u32 msg_version(struct tipc_msg *m)
 160 {
 161         return msg_bits(m, 0, 29, 7);
 162 }
 163
 164 static inline void msg_set_version(struct tipc_msg *m)
 165 {
 166         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 167 }
 168
 169 static inline u32 msg_user(struct tipc_msg *m)
 170 {
 171         return msg_bits(m, 0, 25, 0xf);
 172 }
 173
 174 static inline u32 msg_isdata(struct tipc_msg *m)
 175 {
 176         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 177 }
 178
 179 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 180 {
 181         msg_set_bits(m, 0, 25, 0xf, n);
 182 }
 183
 184 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 185 {
 186         return msg_bits(m, 0, 21, 0xf) << 2;
 187 }
 188
 189 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 190 {
 191         msg_set_bits(m, 0, 21, 0xf, n>>2);
 192 }
 193
 194 static inline u32 msg_size(struct tipc_msg *m)
 195 {
 196         return msg_bits(m, 0, 0, 0x1ffff);
 197 }
 198
 199 static inline u32 msg_blocks(struct tipc_msg *m)
 200 {
 201         return (msg_size(m) / 1024) + 1;
 202 }
 203
 204 static inline u32 msg_data_sz(struct tipc_msg *m)
 205 {
 206         return msg_size(m) - msg_hdr_sz(m);
 207 }
 208
 209 static inline int msg_non_seq(struct tipc_msg *m)
 210 {
 211         return msg_bits(m, 0, 20, 1);
 212 }
 213
 214 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 215 {
 216         msg_set_bits(m, 0, 20, 1, n);
 217 }
 218
 219 static inline int msg_is_syn(struct tipc_msg *m)
 220 {
 221         return msg_bits(m, 0, 17, 1);
 222 }
 223
 224 static inline void msg_set_syn(struct tipc_msg *m, u32 d)
 225 {
 226         msg_set_bits(m, 0, 17, 1, d);
 227 }
 228
 229 static inline int msg_dest_droppable(struct tipc_msg *m)
 230 {
 231         return msg_bits(m, 0, 19, 1);
 232 }
 233
 234 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 235 {
 236         msg_set_bits(m, 0, 19, 1, d);
 237 }
 238
 239 static inline int msg_is_keepalive(struct tipc_msg *m)
 240 {
 241         return msg_bits(m, 0, 19, 1);
 242 }
 243
 244 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
 245 {
 246         msg_set_bits(m, 0, 19, 1, d);
 247 }
 248
 249 static inline int msg_src_droppable(struct tipc_msg *m)
 250 {
 251         return msg_bits(m, 0, 18, 1);
 252 }
 253
 254 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 255 {
 256         msg_set_bits(m, 0, 18, 1, d);
 257 }
 258
 259 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 260 {
 261         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 262 }
 263
 264 static inline unchar *msg_data(struct tipc_msg *m)
 265 {
 266         return ((unchar *)m) + msg_hdr_sz(m);
 267 }
 268
 269 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 270 {
 271         return (struct tipc_msg *)msg_data(m);
 272 }
 273
 274 /*
 275  * Word 1
 276  */
 277 static inline u32 msg_type(struct tipc_msg *m)
 278 {
 279         return msg_bits(m, 1, 29, 0x7);
 280 }
 281
 282 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 283 {
 284         msg_set_bits(m, 1, 29, 0x7, n);
 285 }
 286
 287 static inline int msg_in_group(struct tipc_msg *m)
 288 {
 289         int mtyp = msg_type(m);
 290
 291         return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
 292 }
 293
 294 static inline bool msg_is_grp_evt(struct tipc_msg *m)
 295 {
 296         return msg_type(m) == TIPC_GRP_MEMBER_EVT;
 297 }
 298
 299 static inline u32 msg_named(struct tipc_msg *m)
 300 {
 301         return msg_type(m) == TIPC_NAMED_MSG;
 302 }
 303
 304 static inline u32 msg_mcast(struct tipc_msg *m)
 305 {
 306         int mtyp = msg_type(m);
 307
 308         return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
 309                 (mtyp == TIPC_GRP_MCAST_MSG));
 310 }
 311
 312 static inline u32 msg_connected(struct tipc_msg *m)
 313 {
 314         return msg_type(m) == TIPC_CONN_MSG;
 315 }
 316
 317 static inline u32 msg_errcode(struct tipc_msg *m)
 318 {
 319         return msg_bits(m, 1, 25, 0xf);
 320 }
 321
 322 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 323 {
 324         msg_set_bits(m, 1, 25, 0xf, err);
 325 }
 326
 327 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 328 {
 329         return msg_bits(m, 1, 21, 0xf);
 330 }
 331
 332 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 333 {
 334         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 335 }
 336
 337 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 338 {
 339         msg_set_bits(m, 1, 21, 0xf, 0);
 340 }
 341
 342 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 343 {
 344         return msg_bits(m, 1, 19, 0x3);
 345 }
 346
 347 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 348 {
 349         msg_set_bits(m, 1, 19, 0x3, n);
 350 }
 351
 352 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 353 {
 354         return msg_bits(m, 1, 0, 0xffff);
 355 }
 356
 357 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 358 {
 359         msg_set_bits(m, 1, 0, 0xffff, n);
 360 }
 361
 362
 363 /*
 364  * Word 2
 365  */
 366 static inline u16 msg_ack(struct tipc_msg *m)
 367 {
 368         return msg_bits(m, 2, 16, 0xffff);
 369 }
 370
 371 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 372 {
 373         msg_set_bits(m, 2, 16, 0xffff, n);
 374 }
 375
 376 static inline u16 msg_seqno(struct tipc_msg *m)
 377 {
 378         return msg_bits(m, 2, 0, 0xffff);
 379 }
 380
 381 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 382 {
 383         msg_set_bits(m, 2, 0, 0xffff, n);
 384 }
 385
 386 /*
 387  * Words 3-10
 388  */
 389 static inline u32 msg_importance(struct tipc_msg *m)
 390 {
 391         int usr = msg_user(m);
 392
 393         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 394                 return usr;
 395         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 396                 return msg_bits(m, 9, 0, 0x7);
 397         return TIPC_SYSTEM_IMPORTANCE;
 398 }
 399
 400 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 401 {
 402         int usr = msg_user(m);
 403
 404         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 405                 msg_set_bits(m, 9, 0, 0x7, i);
 406         else if (i < TIPC_SYSTEM_IMPORTANCE)
 407                 msg_set_user(m, i);
 408         else
 409                 pr_warn("Trying to set illegal importance in message\n");
 410 }
 411
 412 static inline u32 msg_prevnode(struct tipc_msg *m)
 413 {
 414         return msg_word(m, 3);
 415 }
 416
 417 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 418 {
 419         msg_set_word(m, 3, a);
 420 }
 421
 422 static inline u32 msg_origport(struct tipc_msg *m)
 423 {
 424         if (msg_user(m) == MSG_FRAGMENTER)
 425                 m = msg_get_wrapped(m);
 426         return msg_word(m, 4);
 427 }
 428
 429 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 430 {
 431         msg_set_word(m, 4, p);
 432 }
 433
 434 static inline u32 msg_destport(struct tipc_msg *m)
 435 {
 436         return msg_word(m, 5);
 437 }
 438
 439 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 440 {
 441         msg_set_word(m, 5, p);
 442 }
 443
 444 static inline u32 msg_mc_netid(struct tipc_msg *m)
 445 {
 446         return msg_word(m, 5);
 447 }
 448
 449 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 450 {
 451         msg_set_word(m, 5, p);
 452 }
 453
 454 static inline int msg_short(struct tipc_msg *m)
 455 {
 456         return msg_hdr_sz(m) == SHORT_H_SIZE;
 457 }
 458
 459 static inline u32 msg_orignode(struct tipc_msg *m)
 460 {
 461         if (likely(msg_short(m)))
 462                 return msg_prevnode(m);
 463         return msg_word(m, 6);
 464 }
 465
 466 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 467 {
 468         msg_set_word(m, 6, a);
 469 }
 470
 471 static inline u32 msg_destnode(struct tipc_msg *m)
 472 {
 473         return msg_word(m, 7);
 474 }
 475
 476 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 477 {
 478         msg_set_word(m, 7, a);
 479 }
 480
 481 static inline u32 msg_nametype(struct tipc_msg *m)
 482 {
 483         return msg_word(m, 8);
 484 }
 485
 486 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 487 {
 488         msg_set_word(m, 8, n);
 489 }
 490
 491 static inline u32 msg_nameinst(struct tipc_msg *m)
 492 {
 493         return msg_word(m, 9);
 494 }
 495
 496 static inline u32 msg_namelower(struct tipc_msg *m)
 497 {
 498         return msg_nameinst(m);
 499 }
 500
 501 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 502 {
 503         msg_set_word(m, 9, n);
 504 }
 505
 506 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 507 {
 508         msg_set_namelower(m, n);
 509 }
 510
 511 static inline u32 msg_nameupper(struct tipc_msg *m)
 512 {
 513         return msg_word(m, 10);
 514 }
 515
 516 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 517 {
 518         msg_set_word(m, 10, n);
 519 }
 520
 521 /*
 522  * Constants and routines used to read and write TIPC internal message headers
 523  */
 524
 525 /*
 526  *  Connection management protocol message types
 527  */
 528 #define CONN_PROBE        0
 529 #define CONN_PROBE_REPLY  1
 530 #define CONN_ACK          2
 531
 532 /*
 533  * Name distributor message types
 534  */
 535 #define PUBLICATION       0
 536 #define WITHDRAWAL        1
 537
 538 /*
 539  * Segmentation message types
 540  */
 541 #define FIRST_FRAGMENT          0
 542 #define FRAGMENT                1
 543 #define LAST_FRAGMENT           2
 544
 545 /*
 546  * Link management protocol message types
 547  */
 548 #define STATE_MSG               0
 549 #define RESET_MSG               1
 550 #define ACTIVATE_MSG            2
 551
 552 /*
 553  * Changeover tunnel message types
 554  */
 555 #define SYNCH_MSG               0
 556 #define FAILOVER_MSG            1
 557
 558 /*
 559  * Config protocol message types
 560  */
 561 #define DSC_REQ_MSG             0
 562 #define DSC_RESP_MSG            1
 563 #define DSC_TRIAL_MSG           2
 564 #define DSC_TRIAL_FAIL_MSG      3
 565
 566 /*
 567  * Group protocol message types
 568  */
 569 #define GRP_JOIN_MSG         0
 570 #define GRP_LEAVE_MSG        1
 571 #define GRP_ADV_MSG          2
 572 #define GRP_ACK_MSG          3
 573 #define GRP_RECLAIM_MSG      4
 574 #define GRP_REMIT_MSG        5
 575
 576 /*
 577  * Word 1
 578  */
 579 static inline u32 msg_seq_gap(struct tipc_msg *m)
 580 {
 581         return msg_bits(m, 1, 16, 0x1fff);
 582 }
 583
 584 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 585 {
 586         msg_set_bits(m, 1, 16, 0x1fff, n);
 587 }
 588
 589 static inline u32 msg_node_sig(struct tipc_msg *m)
 590 {
 591         return msg_bits(m, 1, 0, 0xffff);
 592 }
 593
 594 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 595 {
 596         msg_set_bits(m, 1, 0, 0xffff, n);
 597 }
 598
 599 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 600 {
 601         return msg_bits(m, 1, 15, 0x1fff);
 602 }
 603
 604 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 605 {
 606         msg_set_bits(m, 1, 15, 0x1fff, n);
 607 }
 608
 609 /*
 610  * Word 2
 611  */
 612 static inline u32 msg_dest_domain(struct tipc_msg *m)
 613 {
 614         return msg_word(m, 2);
 615 }
 616
 617 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 618 {
 619         msg_set_word(m, 2, n);
 620 }
 621
 622 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 623 {
 624         return msg_bits(m, 2, 16, 0xffff);
 625 }
 626
 627 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 628 {
 629         msg_set_bits(m, 2, 16, 0xffff, n);
 630 }
 631
 632 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 633 {
 634         return msg_bits(m, 2, 0, 0xffff);
 635 }
 636
 637 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 638 {
 639         msg_set_bits(m, 2, 0, 0xffff, n);
 640 }
 641
 642 /*
 643  * Word 4
 644  */
 645 static inline u32 msg_last_bcast(struct tipc_msg *m)
 646 {
 647         return msg_bits(m, 4, 16, 0xffff);
 648 }
 649
 650 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 651 {
 652         return msg_last_bcast(m) + 1;
 653 }
 654
 655 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 656 {
 657         msg_set_bits(m, 4, 16, 0xffff, n);
 658 }
 659
 660 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 661 {
 662         msg_set_bits(m, 4, 16, 0xffff, n);
 663 }
 664
 665
 666 static inline u16 msg_next_sent(struct tipc_msg *m)
 667 {
 668         return msg_bits(m, 4, 0, 0xffff);
 669 }
 670
 671 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 672 {
 673         msg_set_bits(m, 4, 0, 0xffff, n);
 674 }
 675
 676 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 677 {
 678         msg_set_bits(m, 4, 0, 0xffff, n);
 679 }
 680
 681 static inline u32 msg_bc_netid(struct tipc_msg *m)
 682 {
 683         return msg_word(m, 4);
 684 }
 685
 686 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 687 {
 688         msg_set_word(m, 4, id);
 689 }
 690
 691 static inline u32 msg_link_selector(struct tipc_msg *m)
 692 {
 693         if (msg_user(m) == MSG_FRAGMENTER)
 694                 m = (void *)msg_data(m);
 695         return msg_bits(m, 4, 0, 1);
 696 }
 697
 698 /*
 699  * Word 5
 700  */
 701 static inline u16 msg_session(struct tipc_msg *m)
 702 {
 703         return msg_bits(m, 5, 16, 0xffff);
 704 }
 705
 706 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 707 {
 708         msg_set_bits(m, 5, 16, 0xffff, n);
 709 }
 710
 711 static inline u32 msg_probe(struct tipc_msg *m)
 712 {
 713         return msg_bits(m, 5, 0, 1);
 714 }
 715
 716 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 717 {
 718         msg_set_bits(m, 5, 0, 1, val);
 719 }
 720
 721 static inline char msg_net_plane(struct tipc_msg *m)
 722 {
 723         return msg_bits(m, 5, 1, 7) + 'A';
 724 }
 725
 726 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 727 {
 728         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 729 }
 730
 731 static inline u32 msg_linkprio(struct tipc_msg *m)
 732 {
 733         return msg_bits(m, 5, 4, 0x1f);
 734 }
 735
 736 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 737 {
 738         msg_set_bits(m, 5, 4, 0x1f, n);
 739 }
 740
 741 static inline u32 msg_bearer_id(struct tipc_msg *m)
 742 {
 743         return msg_bits(m, 5, 9, 0x7);
 744 }
 745
 746 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 747 {
 748         msg_set_bits(m, 5, 9, 0x7, n);
 749 }
 750
 751 static inline u32 msg_redundant_link(struct tipc_msg *m)
 752 {
 753         return msg_bits(m, 5, 12, 0x1);
 754 }
 755
 756 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 757 {
 758         msg_set_bits(m, 5, 12, 0x1, r);
 759 }
 760
 761 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 762 {
 763         return msg_bits(m, 5, 13, 0x1);
 764 }
 765
 766 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 767 {
 768         msg_set_bits(m, 5, 13, 0x1, s);
 769 }
 770
 771 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
 772 {
 773         switch (msg_user(m)) {
 774         case BCAST_PROTOCOL:
 775         case NAME_DISTRIBUTOR:
 776         case LINK_PROTOCOL:
 777                 return msg_bits(m, 5, 14, 0x1);
 778         default:
 779                 return false;
 780         }
 781 }
 782
 783 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
 784 {
 785         msg_set_bits(m, 5, 14, 0x1, invalid);
 786 }
 787
 788 static inline char *msg_media_addr(struct tipc_msg *m)
 789 {
 790         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 791 }
 792
 793 static inline u32 msg_bc_gap(struct tipc_msg *m)
 794 {
 795         return msg_bits(m, 8, 0, 0x3ff);
 796 }
 797
 798 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
 799 {
 800         msg_set_bits(m, 8, 0, 0x3ff, n);
 801 }
 802
 803 /*
 804  * Word 9
 805  */
 806 static inline u16 msg_msgcnt(struct tipc_msg *m)
 807 {
 808         return msg_bits(m, 9, 16, 0xffff);
 809 }
 810
 811 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 812 {
 813         msg_set_bits(m, 9, 16, 0xffff, n);
 814 }
 815
 816 static inline u32 msg_conn_ack(struct tipc_msg *m)
 817 {
 818         return msg_bits(m, 9, 16, 0xffff);
 819 }
 820
 821 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 822 {
 823         msg_set_bits(m, 9, 16, 0xffff, n);
 824 }
 825
 826 static inline u16 msg_adv_win(struct tipc_msg *m)
 827 {
 828         return msg_bits(m, 9, 0, 0xffff);
 829 }
 830
 831 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
 832 {
 833         msg_set_bits(m, 9, 0, 0xffff, n);
 834 }
 835
 836 static inline u32 msg_max_pkt(struct tipc_msg *m)
 837 {
 838         return msg_bits(m, 9, 16, 0xffff) * 4;
 839 }
 840
 841 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 842 {
 843         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 844 }
 845
 846 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 847 {
 848         return msg_bits(m, 9, 0, 0xffff);
 849 }
 850
 851 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 852 {
 853         msg_set_bits(m, 9, 0, 0xffff, n);
 854 }
 855
 856 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
 857 {
 858         return msg_bits(m, 9, 16, 0xffff);
 859 }
 860
 861 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
 862 {
 863         msg_set_bits(m, 9, 16, 0xffff, n);
 864 }
 865
 866 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
 867 {
 868         return msg_bits(m, 9, 16, 0xffff);
 869 }
 870
 871 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
 872 {
 873         msg_set_bits(m, 9, 16, 0xffff, n);
 874 }
 875
 876 static inline u16 msg_grp_remitted(struct tipc_msg *m)
 877 {
 878         return msg_bits(m, 9, 16, 0xffff);
 879 }
 880
 881 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
 882 {
 883         msg_set_bits(m, 9, 16, 0xffff, n);
 884 }
 885
 886 /* Word 10
 887  */
 888 static inline u16 msg_grp_evt(struct tipc_msg *m)
 889 {
 890         return msg_bits(m, 10, 0, 0x3);
 891 }
 892
 893 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
 894 {
 895         msg_set_bits(m, 10, 0, 0x3, n);
 896 }
 897
 898 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
 899 {
 900         return msg_bits(m, 10, 0, 0x1);
 901 }
 902
 903 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
 904 {
 905         msg_set_bits(m, 10, 0, 0x1, n);
 906 }
 907
 908 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
 909 {
 910         return msg_bits(m, 10, 16, 0xffff);
 911 }
 912
 913 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
 914 {
 915         msg_set_bits(m, 10, 16, 0xffff, n);
 916 }
 917
 918 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
 919 {
 920         if (likely(msg_user(m) != LINK_PROTOCOL))
 921                 return true;
 922         if (msg_type(m) == STATE_MSG)
 923                 return true;
 924         return false;
 925 }
 926
 927 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
 928 {
 929         if (msg_peer_link_is_up(m))
 930                 return true;
 931         return msg_redundant_link(m);
 932 }
 933
 934 static inline bool msg_is_reset(struct tipc_msg *hdr)
 935 {
 936         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
 937 }
 938
 939 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
 940 {
 941         return msg_word(m, 14);
 942 }
 943
 944 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
 945 {
 946         msg_set_word(m, 14, n);
 947 }
 948
 949 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
 950 {
 951         memcpy(msg_data(hdr), id, 16);
 952 }
 953
 954 static inline u8 *msg_node_id(struct tipc_msg *hdr)
 955 {
 956         return (u8 *)msg_data(hdr);
 957 }
 958
 959 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
 960 bool tipc_msg_validate(struct sk_buff **_skb);
 961 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
 962 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
 963                      struct sk_buff_head *xmitq);
 964 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 965                    u32 hsize, u32 destnode);
 966 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 967                                 uint data_sz, u32 dnode, u32 onode,
 968                                 u32 dport, u32 oport, int errcode);
 969 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 970 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
 971 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
 972                           u32 mtu, u32 dnode);
 973 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 974 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 975                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 976 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
 977 bool tipc_msg_assemble(struct sk_buff_head *list);
 978 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
 979 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
 980                         struct sk_buff_head *cpy);
 981 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
 982                              struct sk_buff *skb);
 983 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
 984
 985 static inline u16 buf_seqno(struct sk_buff *skb)
 986 {
 987         return msg_seqno(buf_msg(skb));
 988 }
 989
 990 static inline int buf_roundup_len(struct sk_buff *skb)
 991 {
 992         return (skb->len / 1024 + 1) * 1024;
 993 }
 994
 995 /* tipc_skb_peek(): peek and reserve first buffer in list
 996  * @list: list to be peeked in
 997  * Returns pointer to first buffer in list, if any
 998  */
 999 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1000                                             spinlock_t *lock)
1001 {
1002         struct sk_buff *skb;
1003
1004         spin_lock_bh(lock);
1005         skb = skb_peek(list);
1006         if (skb)
1007                 skb_get(skb);
1008         spin_unlock_bh(lock);
1009         return skb;
1010 }
1011
1012 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1013  *                       up to and including 'filter'.
1014  * Note: ignoring previously tried destinations minimizes the risk of
1015  *       contention on the socket lock
1016  * @list: list to be peeked in
1017  * @filter: last destination to be ignored from search
1018  * Returns a destination port number, of applicable.
1019  */
1020 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1021 {
1022         struct sk_buff *skb;
1023         u32 dport = 0;
1024         bool ignore = true;
1025
1026         spin_lock_bh(&list->lock);
1027         skb_queue_walk(list, skb) {
1028                 dport = msg_destport(buf_msg(skb));
1029                 if (!filter || skb_queue_is_last(list, skb))
1030                         break;
1031                 if (dport == filter)
1032                         ignore = false;
1033                 else if (!ignore)
1034                         break;
1035         }
1036         spin_unlock_bh(&list->lock);
1037         return dport;
1038 }
1039
1040 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1041  * @list: list to be unlinked from
1042  * @dport: selection criteria for buffer to unlink
1043  */
1044 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1045                                                u32 dport)
1046 {
1047         struct sk_buff *_skb, *tmp, *skb = NULL;
1048
1049         spin_lock_bh(&list->lock);
1050         skb_queue_walk_safe(list, _skb, tmp) {
1051                 if (msg_destport(buf_msg(_skb)) == dport) {
1052                         __skb_unlink(_skb, list);
1053                         skb = _skb;
1054                         break;
1055                 }
1056         }
1057         spin_unlock_bh(&list->lock);
1058         return skb;
1059 }
1060
1061 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1062  * @list: the new list to append. Not lock protected
1063  * @head: target list. Lock protected.
1064  */
1065 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1066                                               struct sk_buff_head *head)
1067 {
1068         spin_lock_bh(&head->lock);
1069         skb_queue_splice_tail(list, head);
1070         spin_unlock_bh(&head->lock);
1071 }
1072
1073 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1074  * @list: the new list to add. Lock protected. Will be reinitialized
1075  * @head: target list. Lock protected.
1076  */
1077 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1078                                                    struct sk_buff_head *head)
1079 {
1080         struct sk_buff_head tmp;
1081
1082         __skb_queue_head_init(&tmp);
1083
1084         spin_lock_bh(&list->lock);
1085         skb_queue_splice_tail_init(list, &tmp);
1086         spin_unlock_bh(&list->lock);
1087         tipc_skb_queue_splice_tail(&tmp, head);
1088 }
1089
1090 #endif