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 /* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
 364  * link peer session number
 365  */
 366 static inline bool msg_dest_session_valid(struct tipc_msg *m)
 367 {
 368         return msg_bits(m, 1, 16, 0x1);
 369 }
 370
 371 static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
 372 {
 373         msg_set_bits(m, 1, 16, 0x1, valid);
 374 }
 375
 376 static inline u16 msg_dest_session(struct tipc_msg *m)
 377 {
 378         return msg_bits(m, 1, 0, 0xffff);
 379 }
 380
 381 static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
 382 {
 383         msg_set_bits(m, 1, 0, 0xffff, n);
 384 }
 385
 386 /*
 387  * Word 2
 388  */
 389 static inline u16 msg_ack(struct tipc_msg *m)
 390 {
 391         return msg_bits(m, 2, 16, 0xffff);
 392 }
 393
 394 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 395 {
 396         msg_set_bits(m, 2, 16, 0xffff, n);
 397 }
 398
 399 static inline u16 msg_seqno(struct tipc_msg *m)
 400 {
 401         return msg_bits(m, 2, 0, 0xffff);
 402 }
 403
 404 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 405 {
 406         msg_set_bits(m, 2, 0, 0xffff, n);
 407 }
 408
 409 /*
 410  * Words 3-10
 411  */
 412 static inline u32 msg_importance(struct tipc_msg *m)
 413 {
 414         int usr = msg_user(m);
 415
 416         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 417                 return usr;
 418         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 419                 return msg_bits(m, 9, 0, 0x7);
 420         return TIPC_SYSTEM_IMPORTANCE;
 421 }
 422
 423 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 424 {
 425         int usr = msg_user(m);
 426
 427         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 428                 msg_set_bits(m, 9, 0, 0x7, i);
 429         else if (i < TIPC_SYSTEM_IMPORTANCE)
 430                 msg_set_user(m, i);
 431         else
 432                 pr_warn("Trying to set illegal importance in message\n");
 433 }
 434
 435 static inline u32 msg_prevnode(struct tipc_msg *m)
 436 {
 437         return msg_word(m, 3);
 438 }
 439
 440 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 441 {
 442         msg_set_word(m, 3, a);
 443 }
 444
 445 static inline u32 msg_origport(struct tipc_msg *m)
 446 {
 447         if (msg_user(m) == MSG_FRAGMENTER)
 448                 m = msg_get_wrapped(m);
 449         return msg_word(m, 4);
 450 }
 451
 452 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 453 {
 454         msg_set_word(m, 4, p);
 455 }
 456
 457 static inline u32 msg_destport(struct tipc_msg *m)
 458 {
 459         return msg_word(m, 5);
 460 }
 461
 462 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 463 {
 464         msg_set_word(m, 5, p);
 465 }
 466
 467 static inline u32 msg_mc_netid(struct tipc_msg *m)
 468 {
 469         return msg_word(m, 5);
 470 }
 471
 472 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 473 {
 474         msg_set_word(m, 5, p);
 475 }
 476
 477 static inline int msg_short(struct tipc_msg *m)
 478 {
 479         return msg_hdr_sz(m) == SHORT_H_SIZE;
 480 }
 481
 482 static inline u32 msg_orignode(struct tipc_msg *m)
 483 {
 484         if (likely(msg_short(m)))
 485                 return msg_prevnode(m);
 486         return msg_word(m, 6);
 487 }
 488
 489 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 490 {
 491         msg_set_word(m, 6, a);
 492 }
 493
 494 static inline u32 msg_destnode(struct tipc_msg *m)
 495 {
 496         return msg_word(m, 7);
 497 }
 498
 499 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 500 {
 501         msg_set_word(m, 7, a);
 502 }
 503
 504 static inline u32 msg_nametype(struct tipc_msg *m)
 505 {
 506         return msg_word(m, 8);
 507 }
 508
 509 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 510 {
 511         msg_set_word(m, 8, n);
 512 }
 513
 514 static inline u32 msg_nameinst(struct tipc_msg *m)
 515 {
 516         return msg_word(m, 9);
 517 }
 518
 519 static inline u32 msg_namelower(struct tipc_msg *m)
 520 {
 521         return msg_nameinst(m);
 522 }
 523
 524 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 525 {
 526         msg_set_word(m, 9, n);
 527 }
 528
 529 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 530 {
 531         msg_set_namelower(m, n);
 532 }
 533
 534 static inline u32 msg_nameupper(struct tipc_msg *m)
 535 {
 536         return msg_word(m, 10);
 537 }
 538
 539 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 540 {
 541         msg_set_word(m, 10, n);
 542 }
 543
 544 /*
 545  * Constants and routines used to read and write TIPC internal message headers
 546  */
 547
 548 /*
 549  *  Connection management protocol message types
 550  */
 551 #define CONN_PROBE        0
 552 #define CONN_PROBE_REPLY  1
 553 #define CONN_ACK          2
 554
 555 /*
 556  * Name distributor message types
 557  */
 558 #define PUBLICATION       0
 559 #define WITHDRAWAL        1
 560
 561 /*
 562  * Segmentation message types
 563  */
 564 #define FIRST_FRAGMENT          0
 565 #define FRAGMENT                1
 566 #define LAST_FRAGMENT           2
 567
 568 /*
 569  * Link management protocol message types
 570  */
 571 #define STATE_MSG               0
 572 #define RESET_MSG               1
 573 #define ACTIVATE_MSG            2
 574
 575 /*
 576  * Changeover tunnel message types
 577  */
 578 #define SYNCH_MSG               0
 579 #define FAILOVER_MSG            1
 580
 581 /*
 582  * Config protocol message types
 583  */
 584 #define DSC_REQ_MSG             0
 585 #define DSC_RESP_MSG            1
 586 #define DSC_TRIAL_MSG           2
 587 #define DSC_TRIAL_FAIL_MSG      3
 588
 589 /*
 590  * Group protocol message types
 591  */
 592 #define GRP_JOIN_MSG         0
 593 #define GRP_LEAVE_MSG        1
 594 #define GRP_ADV_MSG          2
 595 #define GRP_ACK_MSG          3
 596 #define GRP_RECLAIM_MSG      4
 597 #define GRP_REMIT_MSG        5
 598
 599 /*
 600  * Word 1
 601  */
 602 static inline u32 msg_seq_gap(struct tipc_msg *m)
 603 {
 604         return msg_bits(m, 1, 16, 0x1fff);
 605 }
 606
 607 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 608 {
 609         msg_set_bits(m, 1, 16, 0x1fff, n);
 610 }
 611
 612 static inline u32 msg_node_sig(struct tipc_msg *m)
 613 {
 614         return msg_bits(m, 1, 0, 0xffff);
 615 }
 616
 617 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 618 {
 619         msg_set_bits(m, 1, 0, 0xffff, n);
 620 }
 621
 622 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 623 {
 624         return msg_bits(m, 1, 15, 0x1fff);
 625 }
 626
 627 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 628 {
 629         msg_set_bits(m, 1, 15, 0x1fff, n);
 630 }
 631
 632 /*
 633  * Word 2
 634  */
 635 static inline u32 msg_dest_domain(struct tipc_msg *m)
 636 {
 637         return msg_word(m, 2);
 638 }
 639
 640 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 641 {
 642         msg_set_word(m, 2, n);
 643 }
 644
 645 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 646 {
 647         return msg_bits(m, 2, 16, 0xffff);
 648 }
 649
 650 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 651 {
 652         msg_set_bits(m, 2, 16, 0xffff, n);
 653 }
 654
 655 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 656 {
 657         return msg_bits(m, 2, 0, 0xffff);
 658 }
 659
 660 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 661 {
 662         msg_set_bits(m, 2, 0, 0xffff, n);
 663 }
 664
 665 /*
 666  * Word 4
 667  */
 668 static inline u32 msg_last_bcast(struct tipc_msg *m)
 669 {
 670         return msg_bits(m, 4, 16, 0xffff);
 671 }
 672
 673 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 674 {
 675         return msg_last_bcast(m) + 1;
 676 }
 677
 678 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 679 {
 680         msg_set_bits(m, 4, 16, 0xffff, n);
 681 }
 682
 683 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 684 {
 685         msg_set_bits(m, 4, 16, 0xffff, n);
 686 }
 687
 688
 689 static inline u16 msg_next_sent(struct tipc_msg *m)
 690 {
 691         return msg_bits(m, 4, 0, 0xffff);
 692 }
 693
 694 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 695 {
 696         msg_set_bits(m, 4, 0, 0xffff, n);
 697 }
 698
 699 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 700 {
 701         msg_set_bits(m, 4, 0, 0xffff, n);
 702 }
 703
 704 static inline u32 msg_bc_netid(struct tipc_msg *m)
 705 {
 706         return msg_word(m, 4);
 707 }
 708
 709 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 710 {
 711         msg_set_word(m, 4, id);
 712 }
 713
 714 static inline u32 msg_link_selector(struct tipc_msg *m)
 715 {
 716         if (msg_user(m) == MSG_FRAGMENTER)
 717                 m = (void *)msg_data(m);
 718         return msg_bits(m, 4, 0, 1);
 719 }
 720
 721 /*
 722  * Word 5
 723  */
 724 static inline u16 msg_session(struct tipc_msg *m)
 725 {
 726         return msg_bits(m, 5, 16, 0xffff);
 727 }
 728
 729 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 730 {
 731         msg_set_bits(m, 5, 16, 0xffff, n);
 732 }
 733
 734 static inline u32 msg_probe(struct tipc_msg *m)
 735 {
 736         return msg_bits(m, 5, 0, 1);
 737 }
 738
 739 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 740 {
 741         msg_set_bits(m, 5, 0, 1, val);
 742 }
 743
 744 static inline char msg_net_plane(struct tipc_msg *m)
 745 {
 746         return msg_bits(m, 5, 1, 7) + 'A';
 747 }
 748
 749 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 750 {
 751         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 752 }
 753
 754 static inline u32 msg_linkprio(struct tipc_msg *m)
 755 {
 756         return msg_bits(m, 5, 4, 0x1f);
 757 }
 758
 759 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 760 {
 761         msg_set_bits(m, 5, 4, 0x1f, n);
 762 }
 763
 764 static inline u32 msg_bearer_id(struct tipc_msg *m)
 765 {
 766         return msg_bits(m, 5, 9, 0x7);
 767 }
 768
 769 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 770 {
 771         msg_set_bits(m, 5, 9, 0x7, n);
 772 }
 773
 774 static inline u32 msg_redundant_link(struct tipc_msg *m)
 775 {
 776         return msg_bits(m, 5, 12, 0x1);
 777 }
 778
 779 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 780 {
 781         msg_set_bits(m, 5, 12, 0x1, r);
 782 }
 783
 784 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 785 {
 786         return msg_bits(m, 5, 13, 0x1);
 787 }
 788
 789 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 790 {
 791         msg_set_bits(m, 5, 13, 0x1, s);
 792 }
 793
 794 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
 795 {
 796         switch (msg_user(m)) {
 797         case BCAST_PROTOCOL:
 798         case NAME_DISTRIBUTOR:
 799         case LINK_PROTOCOL:
 800                 return msg_bits(m, 5, 14, 0x1);
 801         default:
 802                 return false;
 803         }
 804 }
 805
 806 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
 807 {
 808         msg_set_bits(m, 5, 14, 0x1, invalid);
 809 }
 810
 811 static inline char *msg_media_addr(struct tipc_msg *m)
 812 {
 813         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 814 }
 815
 816 static inline u32 msg_bc_gap(struct tipc_msg *m)
 817 {
 818         return msg_bits(m, 8, 0, 0x3ff);
 819 }
 820
 821 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
 822 {
 823         msg_set_bits(m, 8, 0, 0x3ff, n);
 824 }
 825
 826 /*
 827  * Word 9
 828  */
 829 static inline u16 msg_msgcnt(struct tipc_msg *m)
 830 {
 831         return msg_bits(m, 9, 16, 0xffff);
 832 }
 833
 834 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 835 {
 836         msg_set_bits(m, 9, 16, 0xffff, n);
 837 }
 838
 839 static inline u32 msg_conn_ack(struct tipc_msg *m)
 840 {
 841         return msg_bits(m, 9, 16, 0xffff);
 842 }
 843
 844 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 845 {
 846         msg_set_bits(m, 9, 16, 0xffff, n);
 847 }
 848
 849 static inline u16 msg_adv_win(struct tipc_msg *m)
 850 {
 851         return msg_bits(m, 9, 0, 0xffff);
 852 }
 853
 854 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
 855 {
 856         msg_set_bits(m, 9, 0, 0xffff, n);
 857 }
 858
 859 static inline u32 msg_max_pkt(struct tipc_msg *m)
 860 {
 861         return msg_bits(m, 9, 16, 0xffff) * 4;
 862 }
 863
 864 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 865 {
 866         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 867 }
 868
 869 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 870 {
 871         return msg_bits(m, 9, 0, 0xffff);
 872 }
 873
 874 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 875 {
 876         msg_set_bits(m, 9, 0, 0xffff, n);
 877 }
 878
 879 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
 880 {
 881         return msg_bits(m, 9, 16, 0xffff);
 882 }
 883
 884 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
 885 {
 886         msg_set_bits(m, 9, 16, 0xffff, n);
 887 }
 888
 889 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
 890 {
 891         return msg_bits(m, 9, 16, 0xffff);
 892 }
 893
 894 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
 895 {
 896         msg_set_bits(m, 9, 16, 0xffff, n);
 897 }
 898
 899 static inline u16 msg_grp_remitted(struct tipc_msg *m)
 900 {
 901         return msg_bits(m, 9, 16, 0xffff);
 902 }
 903
 904 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
 905 {
 906         msg_set_bits(m, 9, 16, 0xffff, n);
 907 }
 908
 909 /* Word 10
 910  */
 911 static inline u16 msg_grp_evt(struct tipc_msg *m)
 912 {
 913         return msg_bits(m, 10, 0, 0x3);
 914 }
 915
 916 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
 917 {
 918         msg_set_bits(m, 10, 0, 0x3, n);
 919 }
 920
 921 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
 922 {
 923         return msg_bits(m, 10, 0, 0x1);
 924 }
 925
 926 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
 927 {
 928         msg_set_bits(m, 10, 0, 0x1, n);
 929 }
 930
 931 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
 932 {
 933         return msg_bits(m, 10, 16, 0xffff);
 934 }
 935
 936 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
 937 {
 938         msg_set_bits(m, 10, 16, 0xffff, n);
 939 }
 940
 941 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
 942 {
 943         if (likely(msg_user(m) != LINK_PROTOCOL))
 944                 return true;
 945         if (msg_type(m) == STATE_MSG)
 946                 return true;
 947         return false;
 948 }
 949
 950 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
 951 {
 952         if (msg_peer_link_is_up(m))
 953                 return true;
 954         return msg_redundant_link(m);
 955 }
 956
 957 static inline bool msg_is_reset(struct tipc_msg *hdr)
 958 {
 959         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
 960 }
 961
 962 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
 963 {
 964         return msg_word(m, 14);
 965 }
 966
 967 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
 968 {
 969         msg_set_word(m, 14, n);
 970 }
 971
 972 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
 973 {
 974         memcpy(msg_data(hdr), id, 16);
 975 }
 976
 977 static inline u8 *msg_node_id(struct tipc_msg *hdr)
 978 {
 979         return (u8 *)msg_data(hdr);
 980 }
 981
 982 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
 983 bool tipc_msg_validate(struct sk_buff **_skb);
 984 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
 985 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
 986                      struct sk_buff_head *xmitq);
 987 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
 988                    u32 hsize, u32 destnode);
 989 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 990                                 uint data_sz, u32 dnode, u32 onode,
 991                                 u32 dport, u32 oport, int errcode);
 992 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
 993 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
 994 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
 995                           u32 mtu, u32 dnode);
 996 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 997 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 998                    int offset, int dsz, int mtu, struct sk_buff_head *list);
 999 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
1000 bool tipc_msg_assemble(struct sk_buff_head *list);
1001 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
1002 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
1003                         struct sk_buff_head *cpy);
1004 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
1005                              struct sk_buff *skb);
1006 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
1007
1008 static inline u16 buf_seqno(struct sk_buff *skb)
1009 {
1010         return msg_seqno(buf_msg(skb));
1011 }
1012
1013 static inline int buf_roundup_len(struct sk_buff *skb)
1014 {
1015         return (skb->len / 1024 + 1) * 1024;
1016 }
1017
1018 /* tipc_skb_peek(): peek and reserve first buffer in list
1019  * @list: list to be peeked in
1020  * Returns pointer to first buffer in list, if any
1021  */
1022 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1023                                             spinlock_t *lock)
1024 {
1025         struct sk_buff *skb;
1026
1027         spin_lock_bh(lock);
1028         skb = skb_peek(list);
1029         if (skb)
1030                 skb_get(skb);
1031         spin_unlock_bh(lock);
1032         return skb;
1033 }
1034
1035 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1036  *                       up to and including 'filter'.
1037  * Note: ignoring previously tried destinations minimizes the risk of
1038  *       contention on the socket lock
1039  * @list: list to be peeked in
1040  * @filter: last destination to be ignored from search
1041  * Returns a destination port number, of applicable.
1042  */
1043 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1044 {
1045         struct sk_buff *skb;
1046         u32 dport = 0;
1047         bool ignore = true;
1048
1049         spin_lock_bh(&list->lock);
1050         skb_queue_walk(list, skb) {
1051                 dport = msg_destport(buf_msg(skb));
1052                 if (!filter || skb_queue_is_last(list, skb))
1053                         break;
1054                 if (dport == filter)
1055                         ignore = false;
1056                 else if (!ignore)
1057                         break;
1058         }
1059         spin_unlock_bh(&list->lock);
1060         return dport;
1061 }
1062
1063 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1064  * @list: list to be unlinked from
1065  * @dport: selection criteria for buffer to unlink
1066  */
1067 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1068                                                u32 dport)
1069 {
1070         struct sk_buff *_skb, *tmp, *skb = NULL;
1071
1072         spin_lock_bh(&list->lock);
1073         skb_queue_walk_safe(list, _skb, tmp) {
1074                 if (msg_destport(buf_msg(_skb)) == dport) {
1075                         __skb_unlink(_skb, list);
1076                         skb = _skb;
1077                         break;
1078                 }
1079         }
1080         spin_unlock_bh(&list->lock);
1081         return skb;
1082 }
1083
1084 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1085  * @list: the new list to append. Not lock protected
1086  * @head: target list. Lock protected.
1087  */
1088 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1089                                               struct sk_buff_head *head)
1090 {
1091         spin_lock_bh(&head->lock);
1092         skb_queue_splice_tail(list, head);
1093         spin_unlock_bh(&head->lock);
1094 }
1095
1096 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1097  * @list: the new list to add. Lock protected. Will be reinitialized
1098  * @head: target list. Lock protected.
1099  */
1100 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1101                                                    struct sk_buff_head *head)
1102 {
1103         struct sk_buff_head tmp;
1104
1105         __skb_queue_head_init(&tmp);
1106
1107         spin_lock_bh(&list->lock);
1108         skb_queue_splice_tail_init(list, &tmp);
1109         spin_unlock_bh(&list->lock);
1110         tipc_skb_queue_splice_tail(&tmp, head);
1111 }
1112
1113 #endif