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         unsigned long nxt_retr;
 109         bool validated;
 110         u16 chain_imp;
 111         u16 ackers;
 112 };
 113
 114 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 115
 116 struct tipc_msg {
 117         __be32 hdr[15];
 118 };
 119
 120 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 121 {
 122         return (struct tipc_msg *)skb->data;
 123 }
 124
 125 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 126 {
 127         return ntohl(m->hdr[pos]);
 128 }
 129
 130 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 131 {
 132         m->hdr[w] = htonl(val);
 133 }
 134
 135 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 136 {
 137         return (msg_word(m, w) >> pos) & mask;
 138 }
 139
 140 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 141                                 u32 pos, u32 mask, u32 val)
 142 {
 143         val = (val & mask) << pos;
 144         mask = mask << pos;
 145         m->hdr[w] &= ~htonl(mask);
 146         m->hdr[w] |= htonl(val);
 147 }
 148
 149 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 150 {
 151         u32 temp = msg->hdr[a];
 152
 153         msg->hdr[a] = msg->hdr[b];
 154         msg->hdr[b] = temp;
 155 }
 156
 157 /*
 158  * Word 0
 159  */
 160 static inline u32 msg_version(struct tipc_msg *m)
 161 {
 162         return msg_bits(m, 0, 29, 7);
 163 }
 164
 165 static inline void msg_set_version(struct tipc_msg *m)
 166 {
 167         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 168 }
 169
 170 static inline u32 msg_user(struct tipc_msg *m)
 171 {
 172         return msg_bits(m, 0, 25, 0xf);
 173 }
 174
 175 static inline u32 msg_isdata(struct tipc_msg *m)
 176 {
 177         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 178 }
 179
 180 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 181 {
 182         msg_set_bits(m, 0, 25, 0xf, n);
 183 }
 184
 185 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 186 {
 187         return msg_bits(m, 0, 21, 0xf) << 2;
 188 }
 189
 190 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 191 {
 192         msg_set_bits(m, 0, 21, 0xf, n>>2);
 193 }
 194
 195 static inline u32 msg_size(struct tipc_msg *m)
 196 {
 197         return msg_bits(m, 0, 0, 0x1ffff);
 198 }
 199
 200 static inline u32 msg_blocks(struct tipc_msg *m)
 201 {
 202         return (msg_size(m) / 1024) + 1;
 203 }
 204
 205 static inline u32 msg_data_sz(struct tipc_msg *m)
 206 {
 207         return msg_size(m) - msg_hdr_sz(m);
 208 }
 209
 210 static inline int msg_non_seq(struct tipc_msg *m)
 211 {
 212         return msg_bits(m, 0, 20, 1);
 213 }
 214
 215 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 216 {
 217         msg_set_bits(m, 0, 20, 1, n);
 218 }
 219
 220 static inline int msg_is_syn(struct tipc_msg *m)
 221 {
 222         return msg_bits(m, 0, 17, 1);
 223 }
 224
 225 static inline void msg_set_syn(struct tipc_msg *m, u32 d)
 226 {
 227         msg_set_bits(m, 0, 17, 1, d);
 228 }
 229
 230 static inline int msg_dest_droppable(struct tipc_msg *m)
 231 {
 232         return msg_bits(m, 0, 19, 1);
 233 }
 234
 235 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 236 {
 237         msg_set_bits(m, 0, 19, 1, d);
 238 }
 239
 240 static inline int msg_is_keepalive(struct tipc_msg *m)
 241 {
 242         return msg_bits(m, 0, 19, 1);
 243 }
 244
 245 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
 246 {
 247         msg_set_bits(m, 0, 19, 1, d);
 248 }
 249
 250 static inline int msg_src_droppable(struct tipc_msg *m)
 251 {
 252         return msg_bits(m, 0, 18, 1);
 253 }
 254
 255 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 256 {
 257         msg_set_bits(m, 0, 18, 1, d);
 258 }
 259
 260 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 261 {
 262         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 263 }
 264
 265 static inline unchar *msg_data(struct tipc_msg *m)
 266 {
 267         return ((unchar *)m) + msg_hdr_sz(m);
 268 }
 269
 270 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 271 {
 272         return (struct tipc_msg *)msg_data(m);
 273 }
 274
 275 /*
 276  * Word 1
 277  */
 278 static inline u32 msg_type(struct tipc_msg *m)
 279 {
 280         return msg_bits(m, 1, 29, 0x7);
 281 }
 282
 283 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 284 {
 285         msg_set_bits(m, 1, 29, 0x7, n);
 286 }
 287
 288 static inline int msg_in_group(struct tipc_msg *m)
 289 {
 290         int mtyp = msg_type(m);
 291
 292         return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
 293 }
 294
 295 static inline bool msg_is_grp_evt(struct tipc_msg *m)
 296 {
 297         return msg_type(m) == TIPC_GRP_MEMBER_EVT;
 298 }
 299
 300 static inline u32 msg_named(struct tipc_msg *m)
 301 {
 302         return msg_type(m) == TIPC_NAMED_MSG;
 303 }
 304
 305 static inline u32 msg_mcast(struct tipc_msg *m)
 306 {
 307         int mtyp = msg_type(m);
 308
 309         return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
 310                 (mtyp == TIPC_GRP_MCAST_MSG));
 311 }
 312
 313 static inline u32 msg_connected(struct tipc_msg *m)
 314 {
 315         return msg_type(m) == TIPC_CONN_MSG;
 316 }
 317
 318 static inline u32 msg_errcode(struct tipc_msg *m)
 319 {
 320         return msg_bits(m, 1, 25, 0xf);
 321 }
 322
 323 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 324 {
 325         msg_set_bits(m, 1, 25, 0xf, err);
 326 }
 327
 328 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 329 {
 330         return msg_bits(m, 1, 21, 0xf);
 331 }
 332
 333 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 334 {
 335         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 336 }
 337
 338 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 339 {
 340         msg_set_bits(m, 1, 21, 0xf, 0);
 341 }
 342
 343 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 344 {
 345         return msg_bits(m, 1, 19, 0x3);
 346 }
 347
 348 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 349 {
 350         msg_set_bits(m, 1, 19, 0x3, n);
 351 }
 352
 353 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 354 {
 355         return msg_bits(m, 1, 0, 0xffff);
 356 }
 357
 358 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 359 {
 360         msg_set_bits(m, 1, 0, 0xffff, n);
 361 }
 362
 363
 364 /*
 365  * Word 2
 366  */
 367 static inline u16 msg_ack(struct tipc_msg *m)
 368 {
 369         return msg_bits(m, 2, 16, 0xffff);
 370 }
 371
 372 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 373 {
 374         msg_set_bits(m, 2, 16, 0xffff, n);
 375 }
 376
 377 static inline u16 msg_seqno(struct tipc_msg *m)
 378 {
 379         return msg_bits(m, 2, 0, 0xffff);
 380 }
 381
 382 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 383 {
 384         msg_set_bits(m, 2, 0, 0xffff, n);
 385 }
 386
 387 /*
 388  * Words 3-10
 389  */
 390 static inline u32 msg_importance(struct tipc_msg *m)
 391 {
 392         int usr = msg_user(m);
 393
 394         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 395                 return usr;
 396         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 397                 return msg_bits(m, 9, 0, 0x7);
 398         return TIPC_SYSTEM_IMPORTANCE;
 399 }
 400
 401 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 402 {
 403         int usr = msg_user(m);
 404
 405         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 406                 msg_set_bits(m, 9, 0, 0x7, i);
 407         else if (i < TIPC_SYSTEM_IMPORTANCE)
 408                 msg_set_user(m, i);
 409         else
 410                 pr_warn("Trying to set illegal importance in message\n");
 411 }
 412
 413 static inline u32 msg_prevnode(struct tipc_msg *m)
 414 {
 415         return msg_word(m, 3);
 416 }
 417
 418 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 419 {
 420         msg_set_word(m, 3, a);
 421 }
 422
 423 static inline u32 msg_origport(struct tipc_msg *m)
 424 {
 425         if (msg_user(m) == MSG_FRAGMENTER)
 426                 m = msg_get_wrapped(m);
 427         return msg_word(m, 4);
 428 }
 429
 430 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 431 {
 432         msg_set_word(m, 4, p);
 433 }
 434
 435 static inline u32 msg_destport(struct tipc_msg *m)
 436 {
 437         return msg_word(m, 5);
 438 }
 439
 440 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 441 {
 442         msg_set_word(m, 5, p);
 443 }
 444
 445 static inline u32 msg_mc_netid(struct tipc_msg *m)
 446 {
 447         return msg_word(m, 5);
 448 }
 449
 450 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 451 {
 452         msg_set_word(m, 5, p);
 453 }
 454
 455 static inline int msg_short(struct tipc_msg *m)
 456 {
 457         return msg_hdr_sz(m) == SHORT_H_SIZE;
 458 }
 459
 460 static inline u32 msg_orignode(struct tipc_msg *m)
 461 {
 462         if (likely(msg_short(m)))
 463                 return msg_prevnode(m);
 464         return msg_word(m, 6);
 465 }
 466
 467 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 468 {
 469         msg_set_word(m, 6, a);
 470 }
 471
 472 static inline u32 msg_destnode(struct tipc_msg *m)
 473 {
 474         return msg_word(m, 7);
 475 }
 476
 477 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 478 {
 479         msg_set_word(m, 7, a);
 480 }
 481
 482 static inline u32 msg_nametype(struct tipc_msg *m)
 483 {
 484         return msg_word(m, 8);
 485 }
 486
 487 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 488 {
 489         msg_set_word(m, 8, n);
 490 }
 491
 492 static inline u32 msg_nameinst(struct tipc_msg *m)
 493 {
 494         return msg_word(m, 9);
 495 }
 496
 497 static inline u32 msg_namelower(struct tipc_msg *m)
 498 {
 499         return msg_nameinst(m);
 500 }
 501
 502 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 503 {
 504         msg_set_word(m, 9, n);
 505 }
 506
 507 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 508 {
 509         msg_set_namelower(m, n);
 510 }
 511
 512 static inline u32 msg_nameupper(struct tipc_msg *m)
 513 {
 514         return msg_word(m, 10);
 515 }
 516
 517 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 518 {
 519         msg_set_word(m, 10, n);
 520 }
 521
 522 /*
 523  * Constants and routines used to read and write TIPC internal message headers
 524  */
 525
 526 /*
 527  *  Connection management protocol message types
 528  */
 529 #define CONN_PROBE        0
 530 #define CONN_PROBE_REPLY  1
 531 #define CONN_ACK          2
 532
 533 /*
 534  * Name distributor message types
 535  */
 536 #define PUBLICATION       0
 537 #define WITHDRAWAL        1
 538
 539 /*
 540  * Segmentation message types
 541  */
 542 #define FIRST_FRAGMENT          0
 543 #define FRAGMENT                1
 544 #define LAST_FRAGMENT           2
 545
 546 /*
 547  * Link management protocol message types
 548  */
 549 #define STATE_MSG               0
 550 #define RESET_MSG               1
 551 #define ACTIVATE_MSG            2
 552
 553 /*
 554  * Changeover tunnel message types
 555  */
 556 #define SYNCH_MSG               0
 557 #define FAILOVER_MSG            1
 558
 559 /*
 560  * Config protocol message types
 561  */
 562 #define DSC_REQ_MSG             0
 563 #define DSC_RESP_MSG            1
 564 #define DSC_TRIAL_MSG           2
 565 #define DSC_TRIAL_FAIL_MSG      3
 566
 567 /*
 568  * Group protocol message types
 569  */
 570 #define GRP_JOIN_MSG         0
 571 #define GRP_LEAVE_MSG        1
 572 #define GRP_ADV_MSG          2
 573 #define GRP_ACK_MSG          3
 574 #define GRP_RECLAIM_MSG      4
 575 #define GRP_REMIT_MSG        5
 576
 577 /*
 578  * Word 1
 579  */
 580 static inline u32 msg_seq_gap(struct tipc_msg *m)
 581 {
 582         return msg_bits(m, 1, 16, 0x1fff);
 583 }
 584
 585 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 586 {
 587         msg_set_bits(m, 1, 16, 0x1fff, n);
 588 }
 589
 590 static inline u32 msg_node_sig(struct tipc_msg *m)
 591 {
 592         return msg_bits(m, 1, 0, 0xffff);
 593 }
 594
 595 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 596 {
 597         msg_set_bits(m, 1, 0, 0xffff, n);
 598 }
 599
 600 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 601 {
 602         return msg_bits(m, 1, 15, 0x1fff);
 603 }
 604
 605 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 606 {
 607         msg_set_bits(m, 1, 15, 0x1fff, n);
 608 }
 609
 610 /*
 611  * Word 2
 612  */
 613 static inline u32 msg_dest_domain(struct tipc_msg *m)
 614 {
 615         return msg_word(m, 2);
 616 }
 617
 618 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 619 {
 620         msg_set_word(m, 2, n);
 621 }
 622
 623 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 624 {
 625         return msg_bits(m, 2, 16, 0xffff);
 626 }
 627
 628 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 629 {
 630         msg_set_bits(m, 2, 16, 0xffff, n);
 631 }
 632
 633 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 634 {
 635         return msg_bits(m, 2, 0, 0xffff);
 636 }
 637
 638 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 639 {
 640         msg_set_bits(m, 2, 0, 0xffff, n);
 641 }
 642
 643 /*
 644  * Word 4
 645  */
 646 static inline u32 msg_last_bcast(struct tipc_msg *m)
 647 {
 648         return msg_bits(m, 4, 16, 0xffff);
 649 }
 650
 651 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 652 {
 653         return msg_last_bcast(m) + 1;
 654 }
 655
 656 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 657 {
 658         msg_set_bits(m, 4, 16, 0xffff, n);
 659 }
 660
 661 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 662 {
 663         msg_set_bits(m, 4, 16, 0xffff, n);
 664 }
 665
 666
 667 static inline u16 msg_next_sent(struct tipc_msg *m)
 668 {
 669         return msg_bits(m, 4, 0, 0xffff);
 670 }
 671
 672 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 673 {
 674         msg_set_bits(m, 4, 0, 0xffff, n);
 675 }
 676
 677 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 678 {
 679         msg_set_bits(m, 4, 0, 0xffff, n);
 680 }
 681
 682 static inline u32 msg_bc_netid(struct tipc_msg *m)
 683 {
 684         return msg_word(m, 4);
 685 }
 686
 687 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 688 {
 689         msg_set_word(m, 4, id);
 690 }
 691
 692 static inline u32 msg_link_selector(struct tipc_msg *m)
 693 {
 694         if (msg_user(m) == MSG_FRAGMENTER)
 695                 m = (void *)msg_data(m);
 696         return msg_bits(m, 4, 0, 1);
 697 }
 698
 699 /*
 700  * Word 5
 701  */
 702 static inline u16 msg_session(struct tipc_msg *m)
 703 {
 704         return msg_bits(m, 5, 16, 0xffff);
 705 }
 706
 707 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 708 {
 709         msg_set_bits(m, 5, 16, 0xffff, n);
 710 }
 711
 712 static inline u32 msg_probe(struct tipc_msg *m)
 713 {
 714         return msg_bits(m, 5, 0, 1);
 715 }
 716
 717 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 718 {
 719         msg_set_bits(m, 5, 0, 1, val);
 720 }
 721
 722 static inline char msg_net_plane(struct tipc_msg *m)
 723 {
 724         return msg_bits(m, 5, 1, 7) + 'A';
 725 }
 726
 727 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 728 {
 729         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 730 }
 731
 732 static inline u32 msg_linkprio(struct tipc_msg *m)
 733 {
 734         return msg_bits(m, 5, 4, 0x1f);
 735 }
 736
 737 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 738 {
 739         msg_set_bits(m, 5, 4, 0x1f, n);
 740 }
 741
 742 static inline u32 msg_bearer_id(struct tipc_msg *m)
 743 {
 744         return msg_bits(m, 5, 9, 0x7);
 745 }
 746
 747 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 748 {
 749         msg_set_bits(m, 5, 9, 0x7, n);
 750 }
 751
 752 static inline u32 msg_redundant_link(struct tipc_msg *m)
 753 {
 754         return msg_bits(m, 5, 12, 0x1);
 755 }
 756
 757 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 758 {
 759         msg_set_bits(m, 5, 12, 0x1, r);
 760 }
 761
 762 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 763 {
 764         return msg_bits(m, 5, 13, 0x1);
 765 }
 766
 767 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 768 {
 769         msg_set_bits(m, 5, 13, 0x1, s);
 770 }
 771
 772 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
 773 {
 774         switch (msg_user(m)) {
 775         case BCAST_PROTOCOL:
 776         case NAME_DISTRIBUTOR:
 777         case LINK_PROTOCOL:
 778                 return msg_bits(m, 5, 14, 0x1);
 779         default:
 780                 return false;
 781         }
 782 }
 783
 784 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
 785 {
 786         msg_set_bits(m, 5, 14, 0x1, invalid);
 787 }
 788
 789 static inline char *msg_media_addr(struct tipc_msg *m)
 790 {
 791         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 792 }
 793
 794 static inline u32 msg_bc_gap(struct tipc_msg *m)
 795 {
 796         return msg_bits(m, 8, 0, 0x3ff);
 797 }
 798
 799 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
 800 {
 801         msg_set_bits(m, 8, 0, 0x3ff, n);
 802 }
 803
 804 /*
 805  * Word 9
 806  */
 807 static inline u16 msg_msgcnt(struct tipc_msg *m)
 808 {
 809         return msg_bits(m, 9, 16, 0xffff);
 810 }
 811
 812 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 813 {
 814         msg_set_bits(m, 9, 16, 0xffff, n);
 815 }
 816
 817 static inline u32 msg_conn_ack(struct tipc_msg *m)
 818 {
 819         return msg_bits(m, 9, 16, 0xffff);
 820 }
 821
 822 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 823 {
 824         msg_set_bits(m, 9, 16, 0xffff, n);
 825 }
 826
 827 static inline u16 msg_adv_win(struct tipc_msg *m)
 828 {
 829         return msg_bits(m, 9, 0, 0xffff);
 830 }
 831
 832 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
 833 {
 834         msg_set_bits(m, 9, 0, 0xffff, n);
 835 }
 836
 837 static inline u32 msg_max_pkt(struct tipc_msg *m)
 838 {
 839         return msg_bits(m, 9, 16, 0xffff) * 4;
 840 }
 841
 842 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 843 {
 844         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 845 }
 846
 847 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 848 {
 849         return msg_bits(m, 9, 0, 0xffff);
 850 }
 851
 852 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 853 {
 854         msg_set_bits(m, 9, 0, 0xffff, n);
 855 }
 856
 857 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
 858 {
 859         return msg_bits(m, 9, 16, 0xffff);
 860 }
 861
 862 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
 863 {
 864         msg_set_bits(m, 9, 16, 0xffff, n);
 865 }
 866
 867 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
 868 {
 869         return msg_bits(m, 9, 16, 0xffff);
 870 }
 871
 872 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
 873 {
 874         msg_set_bits(m, 9, 16, 0xffff, n);
 875 }
 876
 877 static inline u16 msg_grp_remitted(struct tipc_msg *m)
 878 {
 879         return msg_bits(m, 9, 16, 0xffff);
 880 }
 881
 882 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
 883 {
 884         msg_set_bits(m, 9, 16, 0xffff, n);
 885 }
 886
 887 /* Word 10
 888  */
 889 static inline u16 msg_grp_evt(struct tipc_msg *m)
 890 {
 891         return msg_bits(m, 10, 0, 0x3);
 892 }
 893
 894 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
 895 {
 896         msg_set_bits(m, 10, 0, 0x3, n);
 897 }
 898
 899 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
 900 {
 901         return msg_bits(m, 10, 0, 0x1);
 902 }
 903
 904 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
 905 {
 906         msg_set_bits(m, 10, 0, 0x1, n);
 907 }
 908
 909 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
 910 {
 911         return msg_bits(m, 10, 16, 0xffff);
 912 }
 913
 914 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
 915 {
 916         msg_set_bits(m, 10, 16, 0xffff, n);
 917 }
 918
 919 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
 920 {
 921         if (likely(msg_user(m) != LINK_PROTOCOL))
 922                 return true;
 923         if (msg_type(m) == STATE_MSG)
 924                 return true;
 925         return false;
 926 }
 927
 928 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
 929 {
 930         if (msg_peer_link_is_up(m))
 931                 return true;
 932         return msg_redundant_link(m);
 933 }
 934
 935 static inline bool msg_is_reset(struct tipc_msg *hdr)
 936 {
 937         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
 938 }
 939
 940 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
 941 {
 942         return msg_word(m, 14);
 943 }
 944
 945 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
 946 {
 947         msg_set_word(m, 14, n);
 948 }
 949
 950 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
 951 {
 952         memcpy(msg_data(hdr), id, 16);
 953 }
 954
 955 static inline u8 *msg_node_id(struct tipc_msg *hdr)
 956 {
 957         return (u8 *)msg_data(hdr);
 958 }
 959
 960 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
 961 bool tipc_msg_validate(struct sk_buff **_skb);
 962 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
 963 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
 964                      struct sk_buff_head *xmitq);
 965 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 966                    u32 hsize, u32 destnode);
 967 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 968                                 uint data_sz, u32 dnode, u32 onode,
 969                                 u32 dport, u32 oport, int errcode);
 970 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 971 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
 972 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
 973                           u32 mtu, u32 dnode);
 974 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 975 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 976                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 977 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
 978 bool tipc_msg_assemble(struct sk_buff_head *list);
 979 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
 980 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
 981                         struct sk_buff_head *cpy);
 982 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
 983                              struct sk_buff *skb);
 984 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
 985
 986 static inline u16 buf_seqno(struct sk_buff *skb)
 987 {
 988         return msg_seqno(buf_msg(skb));
 989 }
 990
 991 static inline int buf_roundup_len(struct sk_buff *skb)
 992 {
 993         return (skb->len / 1024 + 1) * 1024;
 994 }
 995
 996 /* tipc_skb_peek(): peek and reserve first buffer in list
 997  * @list: list to be peeked in
 998  * Returns pointer to first buffer in list, if any
 999  */
1000 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1001                                             spinlock_t *lock)
1002 {
1003         struct sk_buff *skb;
1004
1005         spin_lock_bh(lock);
1006         skb = skb_peek(list);
1007         if (skb)
1008                 skb_get(skb);
1009         spin_unlock_bh(lock);
1010         return skb;
1011 }
1012
1013 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1014  *                       up to and including 'filter'.
1015  * Note: ignoring previously tried destinations minimizes the risk of
1016  *       contention on the socket lock
1017  * @list: list to be peeked in
1018  * @filter: last destination to be ignored from search
1019  * Returns a destination port number, of applicable.
1020  */
1021 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1022 {
1023         struct sk_buff *skb;
1024         u32 dport = 0;
1025         bool ignore = true;
1026
1027         spin_lock_bh(&list->lock);
1028         skb_queue_walk(list, skb) {
1029                 dport = msg_destport(buf_msg(skb));
1030                 if (!filter || skb_queue_is_last(list, skb))
1031                         break;
1032                 if (dport == filter)
1033                         ignore = false;
1034                 else if (!ignore)
1035                         break;
1036         }
1037         spin_unlock_bh(&list->lock);
1038         return dport;
1039 }
1040
1041 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1042  * @list: list to be unlinked from
1043  * @dport: selection criteria for buffer to unlink
1044  */
1045 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1046                                                u32 dport)
1047 {
1048         struct sk_buff *_skb, *tmp, *skb = NULL;
1049
1050         spin_lock_bh(&list->lock);
1051         skb_queue_walk_safe(list, _skb, tmp) {
1052                 if (msg_destport(buf_msg(_skb)) == dport) {
1053                         __skb_unlink(_skb, list);
1054                         skb = _skb;
1055                         break;
1056                 }
1057         }
1058         spin_unlock_bh(&list->lock);
1059         return skb;
1060 }
1061
1062 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1063  * @list: the new list to append. Not lock protected
1064  * @head: target list. Lock protected.
1065  */
1066 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1067                                               struct sk_buff_head *head)
1068 {
1069         spin_lock_bh(&head->lock);
1070         skb_queue_splice_tail(list, head);
1071         spin_unlock_bh(&head->lock);
1072 }
1073
1074 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1075  * @list: the new list to add. Lock protected. Will be reinitialized
1076  * @head: target list. Lock protected.
1077  */
1078 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1079                                                    struct sk_buff_head *head)
1080 {
1081         struct sk_buff_head tmp;
1082
1083         __skb_queue_head_init(&tmp);
1084
1085         spin_lock_bh(&list->lock);
1086         skb_queue_splice_tail_init(list, &tmp);
1087         spin_unlock_bh(&list->lock);
1088         tipc_skb_queue_splice_tail(&tmp, head);
1089 }
1090
1091 #endif