net/tipc/msg.h

   1 /*
   2  * net/tipc/msg.h: Include file for TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2007, 2014, 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
  58 /*
  59  * Payload message types
  60  */
  61 #define TIPC_CONN_MSG           0
  62 #define TIPC_MCAST_MSG          1
  63 #define TIPC_NAMED_MSG          2
  64 #define TIPC_DIRECT_MSG         3
  65
  66 /*
  67  * Message header sizes
  68  */
  69 #define SHORT_H_SIZE              24    /* In-cluster basic payload message */
  70 #define BASIC_H_SIZE              32    /* Basic payload message */
  71 #define NAMED_H_SIZE              40    /* Named payload message */
  72 #define MCAST_H_SIZE              44    /* Multicast payload message */
  73 #define INT_H_SIZE                40    /* Internal messages */
  74 #define MIN_H_SIZE                24    /* Smallest legal TIPC header size */
  75 #define MAX_H_SIZE                60    /* Largest possible TIPC header size */
  76
  77 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
  78
  79 #define TIPC_MEDIA_ADDR_OFFSET  5
  80
  81 /**
  82  * TIPC message buffer code
  83  *
  84  * TIPC message buffer headroom reserves space for the worst-case
  85  * link-level device header (in case the message is sent off-node).
  86  *
  87  * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields
  88  *       are word aligned for quicker access
  89  */
  90 #define BUF_HEADROOM LL_MAX_HEADER
  91
  92 struct tipc_skb_cb {
  93         void *handle;
  94         struct sk_buff *tail;
  95         bool deferred;
  96         bool wakeup_pending;
  97         bool bundling;
  98         u16 chain_sz;
  99         u16 chain_imp;
 100 };
 101
 102 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 103
 104 struct tipc_msg {
 105         __be32 hdr[15];
 106 };
 107
 108 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 109 {
 110         return (struct tipc_msg *)skb->data;
 111 }
 112
 113 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 114 {
 115         return ntohl(m->hdr[pos]);
 116 }
 117
 118 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 119 {
 120         m->hdr[w] = htonl(val);
 121 }
 122
 123 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 124 {
 125         return (msg_word(m, w) >> pos) & mask;
 126 }
 127
 128 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 129                                 u32 pos, u32 mask, u32 val)
 130 {
 131         val = (val & mask) << pos;
 132         mask = mask << pos;
 133         m->hdr[w] &= ~htonl(mask);
 134         m->hdr[w] |= htonl(val);
 135 }
 136
 137 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 138 {
 139         u32 temp = msg->hdr[a];
 140
 141         msg->hdr[a] = msg->hdr[b];
 142         msg->hdr[b] = temp;
 143 }
 144
 145 /*
 146  * Word 0
 147  */
 148 static inline u32 msg_version(struct tipc_msg *m)
 149 {
 150         return msg_bits(m, 0, 29, 7);
 151 }
 152
 153 static inline void msg_set_version(struct tipc_msg *m)
 154 {
 155         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 156 }
 157
 158 static inline u32 msg_user(struct tipc_msg *m)
 159 {
 160         return msg_bits(m, 0, 25, 0xf);
 161 }
 162
 163 static inline u32 msg_isdata(struct tipc_msg *m)
 164 {
 165         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 166 }
 167
 168 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 169 {
 170         msg_set_bits(m, 0, 25, 0xf, n);
 171 }
 172
 173 static inline u32 msg_importance(struct tipc_msg *m)
 174 {
 175         return msg_bits(m, 0, 25, 0xf);
 176 }
 177
 178 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 179 {
 180         msg_set_user(m, i);
 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
 239 /*
 240  * Word 1
 241  */
 242 static inline u32 msg_type(struct tipc_msg *m)
 243 {
 244         return msg_bits(m, 1, 29, 0x7);
 245 }
 246
 247 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 248 {
 249         msg_set_bits(m, 1, 29, 0x7, n);
 250 }
 251
 252 static inline u32 msg_named(struct tipc_msg *m)
 253 {
 254         return msg_type(m) == TIPC_NAMED_MSG;
 255 }
 256
 257 static inline u32 msg_mcast(struct tipc_msg *m)
 258 {
 259         return msg_type(m) == TIPC_MCAST_MSG;
 260 }
 261
 262 static inline u32 msg_connected(struct tipc_msg *m)
 263 {
 264         return msg_type(m) == TIPC_CONN_MSG;
 265 }
 266
 267 static inline u32 msg_errcode(struct tipc_msg *m)
 268 {
 269         return msg_bits(m, 1, 25, 0xf);
 270 }
 271
 272 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 273 {
 274         msg_set_bits(m, 1, 25, 0xf, err);
 275 }
 276
 277 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 278 {
 279         return msg_bits(m, 1, 21, 0xf);
 280 }
 281
 282 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 283 {
 284         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 285 }
 286
 287 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 288 {
 289         msg_set_bits(m, 1, 21, 0xf, 0);
 290 }
 291
 292 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 293 {
 294         return msg_bits(m, 1, 19, 0x3);
 295 }
 296
 297 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 298 {
 299         msg_set_bits(m, 1, 19, 0x3, n);
 300 }
 301
 302 static inline u32 msg_bcast_ack(struct tipc_msg *m)
 303 {
 304         return msg_bits(m, 1, 0, 0xffff);
 305 }
 306
 307 static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
 308 {
 309         msg_set_bits(m, 1, 0, 0xffff, n);
 310 }
 311
 312
 313 /*
 314  * Word 2
 315  */
 316 static inline u32 msg_ack(struct tipc_msg *m)
 317 {
 318         return msg_bits(m, 2, 16, 0xffff);
 319 }
 320
 321 static inline void msg_set_ack(struct tipc_msg *m, u32 n)
 322 {
 323         msg_set_bits(m, 2, 16, 0xffff, n);
 324 }
 325
 326 static inline u32 msg_seqno(struct tipc_msg *m)
 327 {
 328         return msg_bits(m, 2, 0, 0xffff);
 329 }
 330
 331 static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
 332 {
 333         msg_set_bits(m, 2, 0, 0xffff, n);
 334 }
 335
 336 /*
 337  * Words 3-10
 338  */
 339 static inline u32 msg_prevnode(struct tipc_msg *m)
 340 {
 341         return msg_word(m, 3);
 342 }
 343
 344 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 345 {
 346         msg_set_word(m, 3, a);
 347 }
 348
 349 static inline u32 msg_origport(struct tipc_msg *m)
 350 {
 351         return msg_word(m, 4);
 352 }
 353
 354 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 355 {
 356         msg_set_word(m, 4, p);
 357 }
 358
 359 static inline u32 msg_destport(struct tipc_msg *m)
 360 {
 361         return msg_word(m, 5);
 362 }
 363
 364 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 365 {
 366         msg_set_word(m, 5, p);
 367 }
 368
 369 static inline u32 msg_mc_netid(struct tipc_msg *m)
 370 {
 371         return msg_word(m, 5);
 372 }
 373
 374 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 375 {
 376         msg_set_word(m, 5, p);
 377 }
 378
 379 static inline int msg_short(struct tipc_msg *m)
 380 {
 381         return msg_hdr_sz(m) == SHORT_H_SIZE;
 382 }
 383
 384 static inline u32 msg_orignode(struct tipc_msg *m)
 385 {
 386         if (likely(msg_short(m)))
 387                 return msg_prevnode(m);
 388         return msg_word(m, 6);
 389 }
 390
 391 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 392 {
 393         msg_set_word(m, 6, a);
 394 }
 395
 396 static inline u32 msg_destnode(struct tipc_msg *m)
 397 {
 398         return msg_word(m, 7);
 399 }
 400
 401 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 402 {
 403         msg_set_word(m, 7, a);
 404 }
 405
 406 static inline u32 msg_nametype(struct tipc_msg *m)
 407 {
 408         return msg_word(m, 8);
 409 }
 410
 411 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 412 {
 413         msg_set_word(m, 8, n);
 414 }
 415
 416 static inline u32 msg_nameinst(struct tipc_msg *m)
 417 {
 418         return msg_word(m, 9);
 419 }
 420
 421 static inline u32 msg_namelower(struct tipc_msg *m)
 422 {
 423         return msg_nameinst(m);
 424 }
 425
 426 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 427 {
 428         msg_set_word(m, 9, n);
 429 }
 430
 431 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 432 {
 433         msg_set_namelower(m, n);
 434 }
 435
 436 static inline u32 msg_nameupper(struct tipc_msg *m)
 437 {
 438         return msg_word(m, 10);
 439 }
 440
 441 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 442 {
 443         msg_set_word(m, 10, n);
 444 }
 445
 446 static inline unchar *msg_data(struct tipc_msg *m)
 447 {
 448         return ((unchar *)m) + msg_hdr_sz(m);
 449 }
 450
 451 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
 452 {
 453         return (struct tipc_msg *)msg_data(m);
 454 }
 455
 456 /*
 457  * Constants and routines used to read and write TIPC internal message headers
 458  */
 459
 460 /*
 461  * Internal message users
 462  */
 463 #define  BCAST_PROTOCOL       5
 464 #define  MSG_BUNDLER          6
 465 #define  LINK_PROTOCOL        7
 466 #define  CONN_MANAGER         8
 467 #define  ROUTE_DISTRIBUTOR    9         /* obsoleted */
 468 #define  CHANGEOVER_PROTOCOL  10
 469 #define  NAME_DISTRIBUTOR     11
 470 #define  MSG_FRAGMENTER       12
 471 #define  LINK_CONFIG          13
 472 #define  SOCK_WAKEUP          14       /* pseudo user */
 473
 474 /*
 475  *  Connection management protocol message types
 476  */
 477 #define CONN_PROBE        0
 478 #define CONN_PROBE_REPLY  1
 479 #define CONN_ACK          2
 480
 481 /*
 482  * Name distributor message types
 483  */
 484 #define PUBLICATION       0
 485 #define WITHDRAWAL        1
 486
 487 /*
 488  * Segmentation message types
 489  */
 490 #define FIRST_FRAGMENT          0
 491 #define FRAGMENT                1
 492 #define LAST_FRAGMENT           2
 493
 494 /*
 495  * Link management protocol message types
 496  */
 497 #define STATE_MSG               0
 498 #define RESET_MSG               1
 499 #define ACTIVATE_MSG            2
 500
 501 /*
 502  * Changeover tunnel message types
 503  */
 504 #define DUPLICATE_MSG           0
 505 #define ORIGINAL_MSG            1
 506
 507 /*
 508  * Config protocol message types
 509  */
 510 #define DSC_REQ_MSG             0
 511 #define DSC_RESP_MSG            1
 512
 513
 514 /*
 515  * Word 1
 516  */
 517 static inline u32 msg_seq_gap(struct tipc_msg *m)
 518 {
 519         return msg_bits(m, 1, 16, 0x1fff);
 520 }
 521
 522 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 523 {
 524         msg_set_bits(m, 1, 16, 0x1fff, n);
 525 }
 526
 527 static inline u32 msg_node_sig(struct tipc_msg *m)
 528 {
 529         return msg_bits(m, 1, 0, 0xffff);
 530 }
 531
 532 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 533 {
 534         msg_set_bits(m, 1, 0, 0xffff, n);
 535 }
 536
 537
 538 /*
 539  * Word 2
 540  */
 541 static inline u32 msg_dest_domain(struct tipc_msg *m)
 542 {
 543         return msg_word(m, 2);
 544 }
 545
 546 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 547 {
 548         msg_set_word(m, 2, n);
 549 }
 550
 551 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 552 {
 553         return msg_bits(m, 2, 16, 0xffff);
 554 }
 555
 556 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 557 {
 558         msg_set_bits(m, 2, 16, 0xffff, n);
 559 }
 560
 561 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 562 {
 563         return msg_bits(m, 2, 0, 0xffff);
 564 }
 565
 566 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 567 {
 568         msg_set_bits(m, 2, 0, 0xffff, n);
 569 }
 570
 571
 572 /*
 573  * Word 4
 574  */
 575 static inline u32 msg_last_bcast(struct tipc_msg *m)
 576 {
 577         return msg_bits(m, 4, 16, 0xffff);
 578 }
 579
 580 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 581 {
 582         msg_set_bits(m, 4, 16, 0xffff, n);
 583 }
 584
 585 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 586 {
 587         msg_set_bits(m, 4, 16, 0xffff, n);
 588 }
 589
 590
 591 static inline u32 msg_next_sent(struct tipc_msg *m)
 592 {
 593         return msg_bits(m, 4, 0, 0xffff);
 594 }
 595
 596 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
 597 {
 598         msg_set_bits(m, 4, 0, 0xffff, n);
 599 }
 600
 601 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 602 {
 603         msg_set_bits(m, 4, 0, 0xffff, n);
 604 }
 605
 606 static inline u32 msg_bc_netid(struct tipc_msg *m)
 607 {
 608         return msg_word(m, 4);
 609 }
 610
 611 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 612 {
 613         msg_set_word(m, 4, id);
 614 }
 615
 616 static inline u32 msg_link_selector(struct tipc_msg *m)
 617 {
 618         return msg_bits(m, 4, 0, 1);
 619 }
 620
 621 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
 622 {
 623         msg_set_bits(m, 4, 0, 1, n);
 624 }
 625
 626 /*
 627  * Word 5
 628  */
 629 static inline u32 msg_session(struct tipc_msg *m)
 630 {
 631         return msg_bits(m, 5, 16, 0xffff);
 632 }
 633
 634 static inline void msg_set_session(struct tipc_msg *m, u32 n)
 635 {
 636         msg_set_bits(m, 5, 16, 0xffff, n);
 637 }
 638
 639 static inline u32 msg_probe(struct tipc_msg *m)
 640 {
 641         return msg_bits(m, 5, 0, 1);
 642 }
 643
 644 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 645 {
 646         msg_set_bits(m, 5, 0, 1, val);
 647 }
 648
 649 static inline char msg_net_plane(struct tipc_msg *m)
 650 {
 651         return msg_bits(m, 5, 1, 7) + 'A';
 652 }
 653
 654 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 655 {
 656         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 657 }
 658
 659 static inline u32 msg_linkprio(struct tipc_msg *m)
 660 {
 661         return msg_bits(m, 5, 4, 0x1f);
 662 }
 663
 664 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 665 {
 666         msg_set_bits(m, 5, 4, 0x1f, n);
 667 }
 668
 669 static inline u32 msg_bearer_id(struct tipc_msg *m)
 670 {
 671         return msg_bits(m, 5, 9, 0x7);
 672 }
 673
 674 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 675 {
 676         msg_set_bits(m, 5, 9, 0x7, n);
 677 }
 678
 679 static inline u32 msg_redundant_link(struct tipc_msg *m)
 680 {
 681         return msg_bits(m, 5, 12, 0x1);
 682 }
 683
 684 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 685 {
 686         msg_set_bits(m, 5, 12, 0x1, r);
 687 }
 688
 689 static inline char *msg_media_addr(struct tipc_msg *m)
 690 {
 691         return (char *)&m->hdr[TIPC_MEDIA_ADDR_OFFSET];
 692 }
 693
 694 /*
 695  * Word 9
 696  */
 697 static inline u32 msg_msgcnt(struct tipc_msg *m)
 698 {
 699         return msg_bits(m, 9, 16, 0xffff);
 700 }
 701
 702 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
 703 {
 704         msg_set_bits(m, 9, 16, 0xffff, n);
 705 }
 706
 707 static inline u32 msg_bcast_tag(struct tipc_msg *m)
 708 {
 709         return msg_bits(m, 9, 16, 0xffff);
 710 }
 711
 712 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
 713 {
 714         msg_set_bits(m, 9, 16, 0xffff, n);
 715 }
 716
 717 static inline u32 msg_max_pkt(struct tipc_msg *m)
 718 {
 719         return msg_bits(m, 9, 16, 0xffff) * 4;
 720 }
 721
 722 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 723 {
 724         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 725 }
 726
 727 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 728 {
 729         return msg_bits(m, 9, 0, 0xffff);
 730 }
 731
 732 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 733 {
 734         msg_set_bits(m, 9, 0, 0xffff, n);
 735 }
 736
 737 static inline u32 tipc_msg_tot_importance(struct tipc_msg *m)
 738 {
 739         if ((msg_user(m) == MSG_FRAGMENTER) && (msg_type(m) == FIRST_FRAGMENT))
 740                 return msg_importance(msg_get_wrapped(m));
 741         return msg_importance(m);
 742 }
 743
 744 static inline u32 msg_tot_origport(struct tipc_msg *m)
 745 {
 746         if ((msg_user(m) == MSG_FRAGMENTER) && (msg_type(m) == FIRST_FRAGMENT))
 747                 return msg_origport(msg_get_wrapped(m));
 748         return msg_origport(m);
 749 }
 750
 751 struct sk_buff *tipc_buf_acquire(u32 size);
 752 bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
 753                       int err);
 754 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 755                    u32 hsize, u32 destnode);
 756 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 757                                 uint data_sz, u32 dnode, u32 onode,
 758                                 u32 dport, u32 oport, int errcode);
 759 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 760 bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu);
 761 bool tipc_msg_make_bundle(struct sk_buff_head *list,
 762                           struct sk_buff *skb, u32 mtu, u32 dnode);
 763 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 764 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 765                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 766 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, u32 *dnode,
 767                           int *err);
 768 struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list);
 769
 770 /* tipc_skb_peek(): peek and reserve first buffer in list
 771  * @list: list to be peeked in
 772  * Returns pointer to first buffer in list, if any
 773  */
 774 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
 775                                             spinlock_t *lock)
 776 {
 777         struct sk_buff *skb;
 778
 779         spin_lock_bh(lock);
 780         skb = skb_peek(list);
 781         if (skb)
 782                 skb_get(skb);
 783         spin_unlock_bh(lock);
 784         return skb;
 785 }
 786
 787 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
 788  *                       up to and including 'filter'.
 789  * Note: ignoring previously tried destinations minimizes the risk of
 790  *       contention on the socket lock
 791  * @list: list to be peeked in
 792  * @filter: last destination to be ignored from search
 793  * Returns a destination port number, of applicable.
 794  */
 795 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
 796 {
 797         struct sk_buff *skb;
 798         u32 dport = 0;
 799         bool ignore = true;
 800
 801         spin_lock_bh(&list->lock);
 802         skb_queue_walk(list, skb) {
 803                 dport = msg_destport(buf_msg(skb));
 804                 if (!filter || skb_queue_is_last(list, skb))
 805                         break;
 806                 if (dport == filter)
 807                         ignore = false;
 808                 else if (!ignore)
 809                         break;
 810         }
 811         spin_unlock_bh(&list->lock);
 812         return dport;
 813 }
 814
 815 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
 816  * @list: list to be unlinked from
 817  * @dport: selection criteria for buffer to unlink
 818  */
 819 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
 820                                                u32 dport)
 821 {
 822         struct sk_buff *_skb, *tmp, *skb = NULL;
 823
 824         spin_lock_bh(&list->lock);
 825         skb_queue_walk_safe(list, _skb, tmp) {
 826                 if (msg_destport(buf_msg(_skb)) == dport) {
 827                         __skb_unlink(_skb, list);
 828                         skb = _skb;
 829                         break;
 830                 }
 831         }
 832         spin_unlock_bh(&list->lock);
 833         return skb;
 834 }
 835
 836 /* tipc_skb_queue_tail(): add buffer to tail of list;
 837  * @list: list to be appended to
 838  * @skb: buffer to append. Always appended
 839  * @dport: the destination port of the buffer
 840  * returns true if dport differs from previous destination
 841  */
 842 static inline bool tipc_skb_queue_tail(struct sk_buff_head *list,
 843                                        struct sk_buff *skb, u32 dport)
 844 {
 845         struct sk_buff *_skb = NULL;
 846         bool rv = false;
 847
 848         spin_lock_bh(&list->lock);
 849         _skb = skb_peek_tail(list);
 850         if (!_skb || (msg_destport(buf_msg(_skb)) != dport) ||
 851             (skb_queue_len(list) > 32))
 852                 rv = true;
 853         __skb_queue_tail(list, skb);
 854         spin_unlock_bh(&list->lock);
 855         return rv;
 856 }
 857
 858 #endif