net/tipc/msg.h

   1 /*
   2  * net/tipc/msg.h: Include file for TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2007, 2014-2015 Ericsson AB
   5  * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #ifndef _TIPC_MSG_H
  38 #define _TIPC_MSG_H
  39
  40 #include <linux/tipc.h>
  41
  42 /*
  43  * Constants and routines used to read and write TIPC payload message headers
  44  *
  45  * Note: Some items are also used with TIPC internal message headers
  46  */
  47 #define TIPC_VERSION              2
  48 struct plist;
  49
  50 /*
  51  * Payload message users are defined in TIPC's public API:
  52  * - TIPC_LOW_IMPORTANCE
  53  * - TIPC_MEDIUM_IMPORTANCE
  54  * - TIPC_HIGH_IMPORTANCE
  55  * - TIPC_CRITICAL_IMPORTANCE
  56  */
  57 #define TIPC_SYSTEM_IMPORTANCE  4
  58
  59
  60 /*
  61  * Payload message types
  62  */
  63 #define TIPC_CONN_MSG           0
  64 #define TIPC_MCAST_MSG          1
  65 #define TIPC_NAMED_MSG          2
  66 #define TIPC_DIRECT_MSG         3
  67
  68 /*
  69  * Internal message users
  70  */
  71 #define  BCAST_PROTOCOL       5
  72 #define  MSG_BUNDLER          6
  73 #define  LINK_PROTOCOL        7
  74 #define  CONN_MANAGER         8
  75 #define  TUNNEL_PROTOCOL      10
  76 #define  NAME_DISTRIBUTOR     11
  77 #define  MSG_FRAGMENTER       12
  78 #define  LINK_CONFIG          13
  79 #define  SOCK_WAKEUP          14       /* pseudo user */
  80
  81 /*
  82  * Message header sizes
  83  */
  84 #define SHORT_H_SIZE              24    /* In-cluster basic payload message */
  85 #define BASIC_H_SIZE              32    /* Basic payload message */
  86 #define NAMED_H_SIZE              40    /* Named payload message */
  87 #define MCAST_H_SIZE              44    /* Multicast payload message */
  88 #define INT_H_SIZE                40    /* Internal messages */
  89 #define MIN_H_SIZE                24    /* Smallest legal TIPC header size */
  90 #define MAX_H_SIZE                60    /* Largest possible TIPC header size */
  91
  92 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
  93
  94 #define TIPC_MEDIA_INFO_OFFSET  5
  95
  96 /**
  97  * TIPC message buffer code
  98  *
  99  * TIPC message buffer headroom reserves space for the worst-case
 100  * link-level device header (in case the message is sent off-node).
 101  *
 102  * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields
 103  *       are word aligned for quicker access
 104  */
 105 #define BUF_HEADROOM (LL_MAX_HEADER + 48)
 106
 107 struct tipc_skb_cb {
 108         void *handle;
 109         struct sk_buff *tail;
 110         bool validated;
 111         bool wakeup_pending;
 112         bool bundling;
 113         u16 chain_sz;
 114         u16 chain_imp;
 115 };
 116
 117 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 118
 119 struct tipc_msg {
 120         __be32 hdr[15];
 121 };
 122
 123 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 124 {
 125         return (struct tipc_msg *)skb->data;
 126 }
 127
 128 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 129 {
 130         return ntohl(m->hdr[pos]);
 131 }
 132
 133 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 134 {
 135         m->hdr[w] = htonl(val);
 136 }
 137
 138 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 139 {
 140         return (msg_word(m, w) >> pos) & mask;
 141 }
 142
 143 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 144                                 u32 pos, u32 mask, u32 val)
 145 {
 146         val = (val & mask) << pos;
 147         mask = mask << pos;
 148         m->hdr[w] &= ~htonl(mask);
 149         m->hdr[w] |= htonl(val);
 150 }
 151
 152 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 153 {
 154         u32 temp = msg->hdr[a];
 155
 156         msg->hdr[a] = msg->hdr[b];
 157         msg->hdr[b] = temp;
 158 }
 159
 160 /*
 161  * Word 0
 162  */
 163 static inline u32 msg_version(struct tipc_msg *m)
 164 {
 165         return msg_bits(m, 0, 29, 7);
 166 }
 167
 168 static inline void msg_set_version(struct tipc_msg *m)
 169 {
 170         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 171 }
 172
 173 static inline u32 msg_user(struct tipc_msg *m)
 174 {
 175         return msg_bits(m, 0, 25, 0xf);
 176 }
 177
 178 static inline u32 msg_isdata(struct tipc_msg *m)
 179 {
 180         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 181 }
 182
 183 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 184 {
 185         msg_set_bits(m, 0, 25, 0xf, n);
 186 }
 187
 188 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 189 {
 190         return msg_bits(m, 0, 21, 0xf) << 2;
 191 }
 192
 193 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 194 {
 195         msg_set_bits(m, 0, 21, 0xf, n>>2);
 196 }
 197
 198 static inline u32 msg_size(struct tipc_msg *m)
 199 {
 200         return msg_bits(m, 0, 0, 0x1ffff);
 201 }
 202
 203 static inline u32 msg_data_sz(struct tipc_msg *m)
 204 {
 205         return msg_size(m) - msg_hdr_sz(m);
 206 }
 207
 208 static inline int msg_non_seq(struct tipc_msg *m)
 209 {
 210         return msg_bits(m, 0, 20, 1);
 211 }
 212
 213 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 214 {
 215         msg_set_bits(m, 0, 20, 1, n);
 216 }
 217
 218 static inline int msg_dest_droppable(struct tipc_msg *m)
 219 {
 220         return msg_bits(m, 0, 19, 1);
 221 }
 222
 223 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 224 {
 225         msg_set_bits(m, 0, 19, 1, d);
 226 }
 227
 228 static inline int msg_src_droppable(struct tipc_msg *m)
 229 {
 230         return msg_bits(m, 0, 18, 1);
 231 }
 232
 233 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 234 {
 235         msg_set_bits(m, 0, 18, 1, d);
 236 }
 237
 238 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 239 {
 240         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 241 }
 242
 243 static inline unchar *msg_data(struct tipc_msg *m)
 244 {
 245         return ((unchar *)m) + msg_hdr_sz(m);
 246 }
 247
 248 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 249 {
 250         return (struct tipc_msg *)msg_data(m);
 251 }
 252
 253 /*
 254  * Word 1
 255  */
 256 static inline u32 msg_type(struct tipc_msg *m)
 257 {
 258         return msg_bits(m, 1, 29, 0x7);
 259 }
 260
 261 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 262 {
 263         msg_set_bits(m, 1, 29, 0x7, n);
 264 }
 265
 266 static inline u32 msg_named(struct tipc_msg *m)
 267 {
 268         return msg_type(m) == TIPC_NAMED_MSG;
 269 }
 270
 271 static inline u32 msg_mcast(struct tipc_msg *m)
 272 {
 273         return msg_type(m) == TIPC_MCAST_MSG;
 274 }
 275
 276 static inline u32 msg_connected(struct tipc_msg *m)
 277 {
 278         return msg_type(m) == TIPC_CONN_MSG;
 279 }
 280
 281 static inline u32 msg_errcode(struct tipc_msg *m)
 282 {
 283         return msg_bits(m, 1, 25, 0xf);
 284 }
 285
 286 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 287 {
 288         msg_set_bits(m, 1, 25, 0xf, err);
 289 }
 290
 291 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 292 {
 293         return msg_bits(m, 1, 21, 0xf);
 294 }
 295
 296 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 297 {
 298         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 299 }
 300
 301 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 302 {
 303         msg_set_bits(m, 1, 21, 0xf, 0);
 304 }
 305
 306 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 307 {
 308         return msg_bits(m, 1, 19, 0x3);
 309 }
 310
 311 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 312 {
 313         msg_set_bits(m, 1, 19, 0x3, n);
 314 }
 315
 316 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 317 {
 318         return msg_bits(m, 1, 0, 0xffff);
 319 }
 320
 321 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 322 {
 323         msg_set_bits(m, 1, 0, 0xffff, n);
 324 }
 325
 326
 327 /*
 328  * Word 2
 329  */
 330 static inline u16 msg_ack(struct tipc_msg *m)
 331 {
 332         return msg_bits(m, 2, 16, 0xffff);
 333 }
 334
 335 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 336 {
 337         msg_set_bits(m, 2, 16, 0xffff, n);
 338 }
 339
 340 static inline u16 msg_seqno(struct tipc_msg *m)
 341 {
 342         return msg_bits(m, 2, 0, 0xffff);
 343 }
 344
 345 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 346 {
 347         msg_set_bits(m, 2, 0, 0xffff, n);
 348 }
 349
 350 /*
 351  * Words 3-10
 352  */
 353 static inline u32 msg_importance(struct tipc_msg *m)
 354 {
 355         int usr = msg_user(m);
 356
 357         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 358                 return usr;
 359         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 360                 return msg_bits(m, 5, 13, 0x7);
 361         return TIPC_SYSTEM_IMPORTANCE;
 362 }
 363
 364 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 365 {
 366         int usr = msg_user(m);
 367
 368         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 369                 msg_set_bits(m, 5, 13, 0x7, i);
 370         else if (i < TIPC_SYSTEM_IMPORTANCE)
 371                 msg_set_user(m, i);
 372         else
 373                 pr_warn("Trying to set illegal importance in message\n");
 374 }
 375
 376 static inline u32 msg_prevnode(struct tipc_msg *m)
 377 {
 378         return msg_word(m, 3);
 379 }
 380
 381 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 382 {
 383         msg_set_word(m, 3, a);
 384 }
 385
 386 static inline u32 msg_origport(struct tipc_msg *m)
 387 {
 388         if (msg_user(m) == MSG_FRAGMENTER)
 389                 m = msg_get_wrapped(m);
 390         return msg_word(m, 4);
 391 }
 392
 393 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 394 {
 395         msg_set_word(m, 4, p);
 396 }
 397
 398 static inline u32 msg_destport(struct tipc_msg *m)
 399 {
 400         return msg_word(m, 5);
 401 }
 402
 403 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 404 {
 405         msg_set_word(m, 5, p);
 406 }
 407
 408 static inline u32 msg_mc_netid(struct tipc_msg *m)
 409 {
 410         return msg_word(m, 5);
 411 }
 412
 413 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 414 {
 415         msg_set_word(m, 5, p);
 416 }
 417
 418 static inline int msg_short(struct tipc_msg *m)
 419 {
 420         return msg_hdr_sz(m) == SHORT_H_SIZE;
 421 }
 422
 423 static inline u32 msg_orignode(struct tipc_msg *m)
 424 {
 425         if (likely(msg_short(m)))
 426                 return msg_prevnode(m);
 427         return msg_word(m, 6);
 428 }
 429
 430 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 431 {
 432         msg_set_word(m, 6, a);
 433 }
 434
 435 static inline u32 msg_destnode(struct tipc_msg *m)
 436 {
 437         return msg_word(m, 7);
 438 }
 439
 440 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 441 {
 442         msg_set_word(m, 7, a);
 443 }
 444
 445 static inline u32 msg_nametype(struct tipc_msg *m)
 446 {
 447         return msg_word(m, 8);
 448 }
 449
 450 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 451 {
 452         msg_set_word(m, 8, n);
 453 }
 454
 455 static inline u32 msg_nameinst(struct tipc_msg *m)
 456 {
 457         return msg_word(m, 9);
 458 }
 459
 460 static inline u32 msg_namelower(struct tipc_msg *m)
 461 {
 462         return msg_nameinst(m);
 463 }
 464
 465 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 466 {
 467         msg_set_word(m, 9, n);
 468 }
 469
 470 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 471 {
 472         msg_set_namelower(m, n);
 473 }
 474
 475 static inline u32 msg_nameupper(struct tipc_msg *m)
 476 {
 477         return msg_word(m, 10);
 478 }
 479
 480 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 481 {
 482         msg_set_word(m, 10, n);
 483 }
 484
 485 /*
 486  * Constants and routines used to read and write TIPC internal message headers
 487  */
 488
 489 /*
 490  *  Connection management protocol message types
 491  */
 492 #define CONN_PROBE        0
 493 #define CONN_PROBE_REPLY  1
 494 #define CONN_ACK          2
 495
 496 /*
 497  * Name distributor message types
 498  */
 499 #define PUBLICATION       0
 500 #define WITHDRAWAL        1
 501
 502 /*
 503  * Segmentation message types
 504  */
 505 #define FIRST_FRAGMENT          0
 506 #define FRAGMENT                1
 507 #define LAST_FRAGMENT           2
 508
 509 /*
 510  * Link management protocol message types
 511  */
 512 #define STATE_MSG               0
 513 #define RESET_MSG               1
 514 #define ACTIVATE_MSG            2
 515
 516 /*
 517  * Changeover tunnel message types
 518  */
 519 #define SYNCH_MSG               0
 520 #define FAILOVER_MSG            1
 521
 522 /*
 523  * Config protocol message types
 524  */
 525 #define DSC_REQ_MSG             0
 526 #define DSC_RESP_MSG            1
 527
 528 /*
 529  * Word 1
 530  */
 531 static inline u32 msg_seq_gap(struct tipc_msg *m)
 532 {
 533         return msg_bits(m, 1, 16, 0x1fff);
 534 }
 535
 536 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 537 {
 538         msg_set_bits(m, 1, 16, 0x1fff, n);
 539 }
 540
 541 static inline u32 msg_node_sig(struct tipc_msg *m)
 542 {
 543         return msg_bits(m, 1, 0, 0xffff);
 544 }
 545
 546 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 547 {
 548         msg_set_bits(m, 1, 0, 0xffff, n);
 549 }
 550
 551 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 552 {
 553         return msg_bits(m, 1, 15, 0x1fff);
 554 }
 555
 556 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 557 {
 558         msg_set_bits(m, 1, 15, 0x1fff, n);
 559 }
 560
 561 static inline bool msg_dup(struct tipc_msg *m)
 562 {
 563         if (likely(msg_user(m) != TUNNEL_PROTOCOL))
 564                 return false;
 565         if (msg_type(m) != SYNCH_MSG)
 566                 return false;
 567         return true;
 568 }
 569
 570 /*
 571  * Word 2
 572  */
 573 static inline u32 msg_dest_domain(struct tipc_msg *m)
 574 {
 575         return msg_word(m, 2);
 576 }
 577
 578 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 579 {
 580         msg_set_word(m, 2, n);
 581 }
 582
 583 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 584 {
 585         return msg_bits(m, 2, 16, 0xffff);
 586 }
 587
 588 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 589 {
 590         msg_set_bits(m, 2, 16, 0xffff, n);
 591 }
 592
 593 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 594 {
 595         return msg_bits(m, 2, 0, 0xffff);
 596 }
 597
 598 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 599 {
 600         msg_set_bits(m, 2, 0, 0xffff, n);
 601 }
 602
 603
 604 /*
 605  * Word 4
 606  */
 607 static inline u32 msg_last_bcast(struct tipc_msg *m)
 608 {
 609         return msg_bits(m, 4, 16, 0xffff);
 610 }
 611
 612 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 613 {
 614         msg_set_bits(m, 4, 16, 0xffff, n);
 615 }
 616
 617 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 618 {
 619         msg_set_bits(m, 4, 16, 0xffff, n);
 620 }
 621
 622
 623 static inline u32 msg_next_sent(struct tipc_msg *m)
 624 {
 625         return msg_bits(m, 4, 0, 0xffff);
 626 }
 627
 628 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
 629 {
 630         msg_set_bits(m, 4, 0, 0xffff, n);
 631 }
 632
 633 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 634 {
 635         msg_set_bits(m, 4, 0, 0xffff, n);
 636 }
 637
 638 static inline u32 msg_bc_netid(struct tipc_msg *m)
 639 {
 640         return msg_word(m, 4);
 641 }
 642
 643 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 644 {
 645         msg_set_word(m, 4, id);
 646 }
 647
 648 static inline u32 msg_link_selector(struct tipc_msg *m)
 649 {
 650         return msg_bits(m, 4, 0, 1);
 651 }
 652
 653 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
 654 {
 655         msg_set_bits(m, 4, 0, 1, n);
 656 }
 657
 658 /*
 659  * Word 5
 660  */
 661 static inline u32 msg_session(struct tipc_msg *m)
 662 {
 663         return msg_bits(m, 5, 16, 0xffff);
 664 }
 665
 666 static inline void msg_set_session(struct tipc_msg *m, u32 n)
 667 {
 668         msg_set_bits(m, 5, 16, 0xffff, n);
 669 }
 670
 671 static inline u32 msg_probe(struct tipc_msg *m)
 672 {
 673         return msg_bits(m, 5, 0, 1);
 674 }
 675
 676 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 677 {
 678         msg_set_bits(m, 5, 0, 1, val);
 679 }
 680
 681 static inline char msg_net_plane(struct tipc_msg *m)
 682 {
 683         return msg_bits(m, 5, 1, 7) + 'A';
 684 }
 685
 686 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 687 {
 688         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 689 }
 690
 691 static inline u32 msg_linkprio(struct tipc_msg *m)
 692 {
 693         return msg_bits(m, 5, 4, 0x1f);
 694 }
 695
 696 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 697 {
 698         msg_set_bits(m, 5, 4, 0x1f, n);
 699 }
 700
 701 static inline u32 msg_bearer_id(struct tipc_msg *m)
 702 {
 703         return msg_bits(m, 5, 9, 0x7);
 704 }
 705
 706 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 707 {
 708         msg_set_bits(m, 5, 9, 0x7, n);
 709 }
 710
 711 static inline u32 msg_redundant_link(struct tipc_msg *m)
 712 {
 713         return msg_bits(m, 5, 12, 0x1);
 714 }
 715
 716 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 717 {
 718         msg_set_bits(m, 5, 12, 0x1, r);
 719 }
 720
 721 static inline char *msg_media_addr(struct tipc_msg *m)
 722 {
 723         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 724 }
 725
 726 /*
 727  * Word 9
 728  */
 729 static inline u32 msg_msgcnt(struct tipc_msg *m)
 730 {
 731         return msg_bits(m, 9, 16, 0xffff);
 732 }
 733
 734 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
 735 {
 736         msg_set_bits(m, 9, 16, 0xffff, n);
 737 }
 738
 739 static inline u32 msg_bcast_tag(struct tipc_msg *m)
 740 {
 741         return msg_bits(m, 9, 16, 0xffff);
 742 }
 743
 744 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
 745 {
 746         msg_set_bits(m, 9, 16, 0xffff, n);
 747 }
 748
 749 static inline u32 msg_max_pkt(struct tipc_msg *m)
 750 {
 751         return msg_bits(m, 9, 16, 0xffff) * 4;
 752 }
 753
 754 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 755 {
 756         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 757 }
 758
 759 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 760 {
 761         return msg_bits(m, 9, 0, 0xffff);
 762 }
 763
 764 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 765 {
 766         msg_set_bits(m, 9, 0, 0xffff, n);
 767 }
 768
 769 struct sk_buff *tipc_buf_acquire(u32 size);
 770 bool tipc_msg_validate(struct sk_buff *skb);
 771 bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
 772                       int err);
 773 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 774                    u32 hsize, u32 destnode);
 775 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 776                                 uint data_sz, u32 dnode, u32 onode,
 777                                 u32 dport, u32 oport, int errcode);
 778 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 779 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
 780 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
 781                           u32 mtu, u32 dnode);
 782 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 783 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 784                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 785 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, u32 *dnode,
 786                           int *err);
 787 struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list);
 788
 789 static inline u16 buf_seqno(struct sk_buff *skb)
 790 {
 791         return msg_seqno(buf_msg(skb));
 792 }
 793
 794 /* tipc_skb_peek(): peek and reserve first buffer in list
 795  * @list: list to be peeked in
 796  * Returns pointer to first buffer in list, if any
 797  */
 798 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
 799                                             spinlock_t *lock)
 800 {
 801         struct sk_buff *skb;
 802
 803         spin_lock_bh(lock);
 804         skb = skb_peek(list);
 805         if (skb)
 806                 skb_get(skb);
 807         spin_unlock_bh(lock);
 808         return skb;
 809 }
 810
 811 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
 812  *                       up to and including 'filter'.
 813  * Note: ignoring previously tried destinations minimizes the risk of
 814  *       contention on the socket lock
 815  * @list: list to be peeked in
 816  * @filter: last destination to be ignored from search
 817  * Returns a destination port number, of applicable.
 818  */
 819 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
 820 {
 821         struct sk_buff *skb;
 822         u32 dport = 0;
 823         bool ignore = true;
 824
 825         spin_lock_bh(&list->lock);
 826         skb_queue_walk(list, skb) {
 827                 dport = msg_destport(buf_msg(skb));
 828                 if (!filter || skb_queue_is_last(list, skb))
 829                         break;
 830                 if (dport == filter)
 831                         ignore = false;
 832                 else if (!ignore)
 833                         break;
 834         }
 835         spin_unlock_bh(&list->lock);
 836         return dport;
 837 }
 838
 839 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
 840  * @list: list to be unlinked from
 841  * @dport: selection criteria for buffer to unlink
 842  */
 843 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
 844                                                u32 dport)
 845 {
 846         struct sk_buff *_skb, *tmp, *skb = NULL;
 847
 848         spin_lock_bh(&list->lock);
 849         skb_queue_walk_safe(list, _skb, tmp) {
 850                 if (msg_destport(buf_msg(_skb)) == dport) {
 851                         __skb_unlink(_skb, list);
 852                         skb = _skb;
 853                         break;
 854                 }
 855         }
 856         spin_unlock_bh(&list->lock);
 857         return skb;
 858 }
 859
 860 /* tipc_skb_queue_tail(): add buffer to tail of list;
 861  * @list: list to be appended to
 862  * @skb: buffer to append. Always appended
 863  * @dport: the destination port of the buffer
 864  * returns true if dport differs from previous destination
 865  */
 866 static inline bool tipc_skb_queue_tail(struct sk_buff_head *list,
 867                                        struct sk_buff *skb, u32 dport)
 868 {
 869         struct sk_buff *_skb = NULL;
 870         bool rv = false;
 871
 872         spin_lock_bh(&list->lock);
 873         _skb = skb_peek_tail(list);
 874         if (!_skb || (msg_destport(buf_msg(_skb)) != dport) ||
 875             (skb_queue_len(list) > 32))
 876                 rv = true;
 877         __skb_queue_tail(list, skb);
 878         spin_unlock_bh(&list->lock);
 879         return rv;
 880 }
 881
 882 #endif