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         struct sk_buff *tail;
 106         unsigned long nxt_retr;
 107         unsigned long retr_stamp;
 108         u32 bytes_read;
 109         u32 orig_member;
 110         u16 chain_imp;
 111         u16 ackers;
 112         u16 retr_cnt;
 113         bool validated;
 114 };
 115
 116 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 117
 118 struct tipc_msg {
 119         __be32 hdr[15];
 120 };
 121
 122 /* struct tipc_gap_ack - TIPC Gap ACK block
 123  * @ack: seqno of the last consecutive packet in link deferdq
 124  * @gap: number of gap packets since the last ack
 125  *
 126  * E.g:
 127  *       link deferdq: 1 2 3 4      10 11      13 14 15       20
 128  * --> Gap ACK blocks:      <4, 5>,   <11, 1>,      <15, 4>, <20, 0>
 129  */
 130 struct tipc_gap_ack {
 131         __be16 ack;
 132         __be16 gap;
 133 };
 134
 135 /* struct tipc_gap_ack_blks
 136  * @len: actual length of the record
 137  * @gack_cnt: number of Gap ACK blocks in the record
 138  * @gacks: array of Gap ACK blocks
 139  */
 140 struct tipc_gap_ack_blks {
 141         __be16 len;
 142         u8 gack_cnt;
 143         u8 reserved;
 144         struct tipc_gap_ack gacks[];
 145 };
 146
 147 #define tipc_gap_ack_blks_sz(n) (sizeof(struct tipc_gap_ack_blks) + \
 148                                  sizeof(struct tipc_gap_ack) * (n))
 149
 150 #define MAX_GAP_ACK_BLKS        32
 151 #define MAX_GAP_ACK_BLKS_SZ     tipc_gap_ack_blks_sz(MAX_GAP_ACK_BLKS)
 152
 153 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 154 {
 155         return (struct tipc_msg *)skb->data;
 156 }
 157
 158 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
 159 {
 160         return ntohl(m->hdr[pos]);
 161 }
 162
 163 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
 164 {
 165         m->hdr[w] = htonl(val);
 166 }
 167
 168 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
 169 {
 170         return (msg_word(m, w) >> pos) & mask;
 171 }
 172
 173 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 174                                 u32 pos, u32 mask, u32 val)
 175 {
 176         val = (val & mask) << pos;
 177         mask = mask << pos;
 178         m->hdr[w] &= ~htonl(mask);
 179         m->hdr[w] |= htonl(val);
 180 }
 181
 182 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
 183 {
 184         u32 temp = msg->hdr[a];
 185
 186         msg->hdr[a] = msg->hdr[b];
 187         msg->hdr[b] = temp;
 188 }
 189
 190 /*
 191  * Word 0
 192  */
 193 static inline u32 msg_version(struct tipc_msg *m)
 194 {
 195         return msg_bits(m, 0, 29, 7);
 196 }
 197
 198 static inline void msg_set_version(struct tipc_msg *m)
 199 {
 200         msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 201 }
 202
 203 static inline u32 msg_user(struct tipc_msg *m)
 204 {
 205         return msg_bits(m, 0, 25, 0xf);
 206 }
 207
 208 static inline u32 msg_isdata(struct tipc_msg *m)
 209 {
 210         return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
 211 }
 212
 213 static inline void msg_set_user(struct tipc_msg *m, u32 n)
 214 {
 215         msg_set_bits(m, 0, 25, 0xf, n);
 216 }
 217
 218 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 219 {
 220         return msg_bits(m, 0, 21, 0xf) << 2;
 221 }
 222
 223 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
 224 {
 225         msg_set_bits(m, 0, 21, 0xf, n>>2);
 226 }
 227
 228 static inline u32 msg_size(struct tipc_msg *m)
 229 {
 230         return msg_bits(m, 0, 0, 0x1ffff);
 231 }
 232
 233 static inline u32 msg_blocks(struct tipc_msg *m)
 234 {
 235         return (msg_size(m) / 1024) + 1;
 236 }
 237
 238 static inline u32 msg_data_sz(struct tipc_msg *m)
 239 {
 240         return msg_size(m) - msg_hdr_sz(m);
 241 }
 242
 243 static inline int msg_non_seq(struct tipc_msg *m)
 244 {
 245         return msg_bits(m, 0, 20, 1);
 246 }
 247
 248 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
 249 {
 250         msg_set_bits(m, 0, 20, 1, n);
 251 }
 252
 253 static inline int msg_is_syn(struct tipc_msg *m)
 254 {
 255         return msg_bits(m, 0, 17, 1);
 256 }
 257
 258 static inline void msg_set_syn(struct tipc_msg *m, u32 d)
 259 {
 260         msg_set_bits(m, 0, 17, 1, d);
 261 }
 262
 263 static inline int msg_dest_droppable(struct tipc_msg *m)
 264 {
 265         return msg_bits(m, 0, 19, 1);
 266 }
 267
 268 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
 269 {
 270         msg_set_bits(m, 0, 19, 1, d);
 271 }
 272
 273 static inline int msg_is_keepalive(struct tipc_msg *m)
 274 {
 275         return msg_bits(m, 0, 19, 1);
 276 }
 277
 278 static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
 279 {
 280         msg_set_bits(m, 0, 19, 1, d);
 281 }
 282
 283 static inline int msg_src_droppable(struct tipc_msg *m)
 284 {
 285         return msg_bits(m, 0, 18, 1);
 286 }
 287
 288 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
 289 {
 290         msg_set_bits(m, 0, 18, 1, d);
 291 }
 292
 293 static inline bool msg_is_rcast(struct tipc_msg *m)
 294 {
 295         return msg_bits(m, 0, 18, 0x1);
 296 }
 297
 298 static inline void msg_set_is_rcast(struct tipc_msg *m, bool d)
 299 {
 300         msg_set_bits(m, 0, 18, 0x1, d);
 301 }
 302
 303 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
 304 {
 305         m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
 306 }
 307
 308 static inline unchar *msg_data(struct tipc_msg *m)
 309 {
 310         return ((unchar *)m) + msg_hdr_sz(m);
 311 }
 312
 313 static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m)
 314 {
 315         return (struct tipc_msg *)msg_data(m);
 316 }
 317
 318 /*
 319  * Word 1
 320  */
 321 static inline u32 msg_type(struct tipc_msg *m)
 322 {
 323         return msg_bits(m, 1, 29, 0x7);
 324 }
 325
 326 static inline void msg_set_type(struct tipc_msg *m, u32 n)
 327 {
 328         msg_set_bits(m, 1, 29, 0x7, n);
 329 }
 330
 331 static inline int msg_in_group(struct tipc_msg *m)
 332 {
 333         int mtyp = msg_type(m);
 334
 335         return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
 336 }
 337
 338 static inline bool msg_is_grp_evt(struct tipc_msg *m)
 339 {
 340         return msg_type(m) == TIPC_GRP_MEMBER_EVT;
 341 }
 342
 343 static inline u32 msg_named(struct tipc_msg *m)
 344 {
 345         return msg_type(m) == TIPC_NAMED_MSG;
 346 }
 347
 348 static inline u32 msg_mcast(struct tipc_msg *m)
 349 {
 350         int mtyp = msg_type(m);
 351
 352         return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
 353                 (mtyp == TIPC_GRP_MCAST_MSG));
 354 }
 355
 356 static inline u32 msg_connected(struct tipc_msg *m)
 357 {
 358         return msg_type(m) == TIPC_CONN_MSG;
 359 }
 360
 361 static inline u32 msg_errcode(struct tipc_msg *m)
 362 {
 363         return msg_bits(m, 1, 25, 0xf);
 364 }
 365
 366 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
 367 {
 368         msg_set_bits(m, 1, 25, 0xf, err);
 369 }
 370
 371 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
 372 {
 373         return msg_bits(m, 1, 21, 0xf);
 374 }
 375
 376 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
 377 {
 378         msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
 379 }
 380
 381 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
 382 {
 383         msg_set_bits(m, 1, 21, 0xf, 0);
 384 }
 385
 386 static inline u32 msg_lookup_scope(struct tipc_msg *m)
 387 {
 388         return msg_bits(m, 1, 19, 0x3);
 389 }
 390
 391 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 392 {
 393         msg_set_bits(m, 1, 19, 0x3, n);
 394 }
 395
 396 static inline u16 msg_bcast_ack(struct tipc_msg *m)
 397 {
 398         return msg_bits(m, 1, 0, 0xffff);
 399 }
 400
 401 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 402 {
 403         msg_set_bits(m, 1, 0, 0xffff, n);
 404 }
 405
 406 /* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
 407  * link peer session number
 408  */
 409 static inline bool msg_dest_session_valid(struct tipc_msg *m)
 410 {
 411         return msg_bits(m, 1, 16, 0x1);
 412 }
 413
 414 static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
 415 {
 416         msg_set_bits(m, 1, 16, 0x1, valid);
 417 }
 418
 419 static inline u16 msg_dest_session(struct tipc_msg *m)
 420 {
 421         return msg_bits(m, 1, 0, 0xffff);
 422 }
 423
 424 static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
 425 {
 426         msg_set_bits(m, 1, 0, 0xffff, n);
 427 }
 428
 429 /*
 430  * Word 2
 431  */
 432 static inline u16 msg_ack(struct tipc_msg *m)
 433 {
 434         return msg_bits(m, 2, 16, 0xffff);
 435 }
 436
 437 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 438 {
 439         msg_set_bits(m, 2, 16, 0xffff, n);
 440 }
 441
 442 static inline u16 msg_seqno(struct tipc_msg *m)
 443 {
 444         return msg_bits(m, 2, 0, 0xffff);
 445 }
 446
 447 static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 448 {
 449         msg_set_bits(m, 2, 0, 0xffff, n);
 450 }
 451
 452 /*
 453  * Words 3-10
 454  */
 455 static inline u32 msg_importance(struct tipc_msg *m)
 456 {
 457         int usr = msg_user(m);
 458
 459         if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
 460                 return usr;
 461         if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 462                 return msg_bits(m, 9, 0, 0x7);
 463         return TIPC_SYSTEM_IMPORTANCE;
 464 }
 465
 466 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 467 {
 468         int usr = msg_user(m);
 469
 470         if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 471                 msg_set_bits(m, 9, 0, 0x7, i);
 472         else if (i < TIPC_SYSTEM_IMPORTANCE)
 473                 msg_set_user(m, i);
 474         else
 475                 pr_warn("Trying to set illegal importance in message\n");
 476 }
 477
 478 static inline u32 msg_prevnode(struct tipc_msg *m)
 479 {
 480         return msg_word(m, 3);
 481 }
 482
 483 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
 484 {
 485         msg_set_word(m, 3, a);
 486 }
 487
 488 static inline u32 msg_origport(struct tipc_msg *m)
 489 {
 490         if (msg_user(m) == MSG_FRAGMENTER)
 491                 m = msg_inner_hdr(m);
 492         return msg_word(m, 4);
 493 }
 494
 495 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
 496 {
 497         msg_set_word(m, 4, p);
 498 }
 499
 500 static inline u32 msg_destport(struct tipc_msg *m)
 501 {
 502         return msg_word(m, 5);
 503 }
 504
 505 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
 506 {
 507         msg_set_word(m, 5, p);
 508 }
 509
 510 static inline u32 msg_mc_netid(struct tipc_msg *m)
 511 {
 512         return msg_word(m, 5);
 513 }
 514
 515 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
 516 {
 517         msg_set_word(m, 5, p);
 518 }
 519
 520 static inline int msg_short(struct tipc_msg *m)
 521 {
 522         return msg_hdr_sz(m) == SHORT_H_SIZE;
 523 }
 524
 525 static inline u32 msg_orignode(struct tipc_msg *m)
 526 {
 527         if (likely(msg_short(m)))
 528                 return msg_prevnode(m);
 529         return msg_word(m, 6);
 530 }
 531
 532 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
 533 {
 534         msg_set_word(m, 6, a);
 535 }
 536
 537 static inline u32 msg_destnode(struct tipc_msg *m)
 538 {
 539         return msg_word(m, 7);
 540 }
 541
 542 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
 543 {
 544         msg_set_word(m, 7, a);
 545 }
 546
 547 static inline u32 msg_nametype(struct tipc_msg *m)
 548 {
 549         return msg_word(m, 8);
 550 }
 551
 552 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
 553 {
 554         msg_set_word(m, 8, n);
 555 }
 556
 557 static inline u32 msg_nameinst(struct tipc_msg *m)
 558 {
 559         return msg_word(m, 9);
 560 }
 561
 562 static inline u32 msg_namelower(struct tipc_msg *m)
 563 {
 564         return msg_nameinst(m);
 565 }
 566
 567 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
 568 {
 569         msg_set_word(m, 9, n);
 570 }
 571
 572 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
 573 {
 574         msg_set_namelower(m, n);
 575 }
 576
 577 static inline u32 msg_nameupper(struct tipc_msg *m)
 578 {
 579         return msg_word(m, 10);
 580 }
 581
 582 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
 583 {
 584         msg_set_word(m, 10, n);
 585 }
 586
 587 /*
 588  * Constants and routines used to read and write TIPC internal message headers
 589  */
 590
 591 /*
 592  *  Connection management protocol message types
 593  */
 594 #define CONN_PROBE        0
 595 #define CONN_PROBE_REPLY  1
 596 #define CONN_ACK          2
 597
 598 /*
 599  * Name distributor message types
 600  */
 601 #define PUBLICATION       0
 602 #define WITHDRAWAL        1
 603
 604 /*
 605  * Segmentation message types
 606  */
 607 #define FIRST_FRAGMENT          0
 608 #define FRAGMENT                1
 609 #define LAST_FRAGMENT           2
 610
 611 /*
 612  * Link management protocol message types
 613  */
 614 #define STATE_MSG               0
 615 #define RESET_MSG               1
 616 #define ACTIVATE_MSG            2
 617
 618 /*
 619  * Changeover tunnel message types
 620  */
 621 #define SYNCH_MSG               0
 622 #define FAILOVER_MSG            1
 623
 624 /*
 625  * Config protocol message types
 626  */
 627 #define DSC_REQ_MSG             0
 628 #define DSC_RESP_MSG            1
 629 #define DSC_TRIAL_MSG           2
 630 #define DSC_TRIAL_FAIL_MSG      3
 631
 632 /*
 633  * Group protocol message types
 634  */
 635 #define GRP_JOIN_MSG         0
 636 #define GRP_LEAVE_MSG        1
 637 #define GRP_ADV_MSG          2
 638 #define GRP_ACK_MSG          3
 639 #define GRP_RECLAIM_MSG      4
 640 #define GRP_REMIT_MSG        5
 641
 642 /*
 643  * Word 1
 644  */
 645 static inline u32 msg_seq_gap(struct tipc_msg *m)
 646 {
 647         return msg_bits(m, 1, 16, 0x1fff);
 648 }
 649
 650 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 651 {
 652         msg_set_bits(m, 1, 16, 0x1fff, n);
 653 }
 654
 655 static inline u32 msg_node_sig(struct tipc_msg *m)
 656 {
 657         return msg_bits(m, 1, 0, 0xffff);
 658 }
 659
 660 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 661 {
 662         msg_set_bits(m, 1, 0, 0xffff, n);
 663 }
 664
 665 static inline u32 msg_node_capabilities(struct tipc_msg *m)
 666 {
 667         return msg_bits(m, 1, 15, 0x1fff);
 668 }
 669
 670 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
 671 {
 672         msg_set_bits(m, 1, 15, 0x1fff, n);
 673 }
 674
 675 /*
 676  * Word 2
 677  */
 678 static inline u32 msg_dest_domain(struct tipc_msg *m)
 679 {
 680         return msg_word(m, 2);
 681 }
 682
 683 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 684 {
 685         msg_set_word(m, 2, n);
 686 }
 687
 688 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 689 {
 690         return msg_bits(m, 2, 16, 0xffff);
 691 }
 692
 693 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 694 {
 695         msg_set_bits(m, 2, 16, 0xffff, n);
 696 }
 697
 698 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 699 {
 700         return msg_bits(m, 2, 0, 0xffff);
 701 }
 702
 703 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 704 {
 705         msg_set_bits(m, 2, 0, 0xffff, n);
 706 }
 707
 708 /*
 709  * Word 4
 710  */
 711 static inline u32 msg_last_bcast(struct tipc_msg *m)
 712 {
 713         return msg_bits(m, 4, 16, 0xffff);
 714 }
 715
 716 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
 717 {
 718         return msg_last_bcast(m) + 1;
 719 }
 720
 721 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 722 {
 723         msg_set_bits(m, 4, 16, 0xffff, n);
 724 }
 725
 726 static inline u32 msg_nof_fragms(struct tipc_msg *m)
 727 {
 728         return msg_bits(m, 4, 0, 0xffff);
 729 }
 730
 731 static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n)
 732 {
 733         msg_set_bits(m, 4, 0, 0xffff, n);
 734 }
 735
 736 static inline u32 msg_fragm_no(struct tipc_msg *m)
 737 {
 738         return msg_bits(m, 4, 16, 0xffff);
 739 }
 740
 741 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 742 {
 743         msg_set_bits(m, 4, 16, 0xffff, n);
 744 }
 745
 746 static inline u16 msg_next_sent(struct tipc_msg *m)
 747 {
 748         return msg_bits(m, 4, 0, 0xffff);
 749 }
 750
 751 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
 752 {
 753         msg_set_bits(m, 4, 0, 0xffff, n);
 754 }
 755
 756 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 757 {
 758         msg_set_bits(m, 4, 0, 0xffff, n);
 759 }
 760
 761 static inline u32 msg_bc_netid(struct tipc_msg *m)
 762 {
 763         return msg_word(m, 4);
 764 }
 765
 766 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 767 {
 768         msg_set_word(m, 4, id);
 769 }
 770
 771 static inline u32 msg_link_selector(struct tipc_msg *m)
 772 {
 773         if (msg_user(m) == MSG_FRAGMENTER)
 774                 m = (void *)msg_data(m);
 775         return msg_bits(m, 4, 0, 1);
 776 }
 777
 778 /*
 779  * Word 5
 780  */
 781 static inline u16 msg_session(struct tipc_msg *m)
 782 {
 783         return msg_bits(m, 5, 16, 0xffff);
 784 }
 785
 786 static inline void msg_set_session(struct tipc_msg *m, u16 n)
 787 {
 788         msg_set_bits(m, 5, 16, 0xffff, n);
 789 }
 790
 791 static inline u32 msg_probe(struct tipc_msg *m)
 792 {
 793         return msg_bits(m, 5, 0, 1);
 794 }
 795
 796 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 797 {
 798         msg_set_bits(m, 5, 0, 1, val);
 799 }
 800
 801 static inline char msg_net_plane(struct tipc_msg *m)
 802 {
 803         return msg_bits(m, 5, 1, 7) + 'A';
 804 }
 805
 806 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 807 {
 808         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 809 }
 810
 811 static inline u32 msg_linkprio(struct tipc_msg *m)
 812 {
 813         return msg_bits(m, 5, 4, 0x1f);
 814 }
 815
 816 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 817 {
 818         msg_set_bits(m, 5, 4, 0x1f, n);
 819 }
 820
 821 static inline u32 msg_bearer_id(struct tipc_msg *m)
 822 {
 823         return msg_bits(m, 5, 9, 0x7);
 824 }
 825
 826 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 827 {
 828         msg_set_bits(m, 5, 9, 0x7, n);
 829 }
 830
 831 static inline u32 msg_redundant_link(struct tipc_msg *m)
 832 {
 833         return msg_bits(m, 5, 12, 0x1);
 834 }
 835
 836 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 837 {
 838         msg_set_bits(m, 5, 12, 0x1, r);
 839 }
 840
 841 static inline u32 msg_peer_stopping(struct tipc_msg *m)
 842 {
 843         return msg_bits(m, 5, 13, 0x1);
 844 }
 845
 846 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
 847 {
 848         msg_set_bits(m, 5, 13, 0x1, s);
 849 }
 850
 851 static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
 852 {
 853         switch (msg_user(m)) {
 854         case BCAST_PROTOCOL:
 855         case NAME_DISTRIBUTOR:
 856         case LINK_PROTOCOL:
 857                 return msg_bits(m, 5, 14, 0x1);
 858         default:
 859                 return false;
 860         }
 861 }
 862
 863 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
 864 {
 865         msg_set_bits(m, 5, 14, 0x1, invalid);
 866 }
 867
 868 static inline char *msg_media_addr(struct tipc_msg *m)
 869 {
 870         return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
 871 }
 872
 873 static inline u32 msg_bc_gap(struct tipc_msg *m)
 874 {
 875         return msg_bits(m, 8, 0, 0x3ff);
 876 }
 877
 878 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
 879 {
 880         msg_set_bits(m, 8, 0, 0x3ff, n);
 881 }
 882
 883 /*
 884  * Word 9
 885  */
 886 static inline u16 msg_msgcnt(struct tipc_msg *m)
 887 {
 888         return msg_bits(m, 9, 16, 0xffff);
 889 }
 890
 891 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
 892 {
 893         msg_set_bits(m, 9, 16, 0xffff, n);
 894 }
 895
 896 static inline u16 msg_syncpt(struct tipc_msg *m)
 897 {
 898         return msg_bits(m, 9, 16, 0xffff);
 899 }
 900
 901 static inline void msg_set_syncpt(struct tipc_msg *m, u16 n)
 902 {
 903         msg_set_bits(m, 9, 16, 0xffff, n);
 904 }
 905
 906 static inline u32 msg_conn_ack(struct tipc_msg *m)
 907 {
 908         return msg_bits(m, 9, 16, 0xffff);
 909 }
 910
 911 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
 912 {
 913         msg_set_bits(m, 9, 16, 0xffff, n);
 914 }
 915
 916 static inline u16 msg_adv_win(struct tipc_msg *m)
 917 {
 918         return msg_bits(m, 9, 0, 0xffff);
 919 }
 920
 921 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
 922 {
 923         msg_set_bits(m, 9, 0, 0xffff, n);
 924 }
 925
 926 static inline u32 msg_max_pkt(struct tipc_msg *m)
 927 {
 928         return msg_bits(m, 9, 16, 0xffff) * 4;
 929 }
 930
 931 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 932 {
 933         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 934 }
 935
 936 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 937 {
 938         return msg_bits(m, 9, 0, 0xffff);
 939 }
 940
 941 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 942 {
 943         msg_set_bits(m, 9, 0, 0xffff, n);
 944 }
 945
 946 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
 947 {
 948         return msg_bits(m, 9, 16, 0xffff);
 949 }
 950
 951 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
 952 {
 953         msg_set_bits(m, 9, 16, 0xffff, n);
 954 }
 955
 956 static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
 957 {
 958         return msg_bits(m, 9, 16, 0xffff);
 959 }
 960
 961 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
 962 {
 963         msg_set_bits(m, 9, 16, 0xffff, n);
 964 }
 965
 966 static inline u16 msg_grp_remitted(struct tipc_msg *m)
 967 {
 968         return msg_bits(m, 9, 16, 0xffff);
 969 }
 970
 971 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
 972 {
 973         msg_set_bits(m, 9, 16, 0xffff, n);
 974 }
 975
 976 /* Word 10
 977  */
 978 static inline u16 msg_grp_evt(struct tipc_msg *m)
 979 {
 980         return msg_bits(m, 10, 0, 0x3);
 981 }
 982
 983 static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
 984 {
 985         msg_set_bits(m, 10, 0, 0x3, n);
 986 }
 987
 988 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
 989 {
 990         return msg_bits(m, 10, 0, 0x1);
 991 }
 992
 993 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
 994 {
 995         msg_set_bits(m, 10, 0, 0x1, n);
 996 }
 997
 998 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
 999 {
1000         return msg_bits(m, 10, 16, 0xffff);
1001 }
1002
1003 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
1004 {
1005         msg_set_bits(m, 10, 16, 0xffff, n);
1006 }
1007
1008 static inline bool msg_peer_link_is_up(struct tipc_msg *m)
1009 {
1010         if (likely(msg_user(m) != LINK_PROTOCOL))
1011                 return true;
1012         if (msg_type(m) == STATE_MSG)
1013                 return true;
1014         return false;
1015 }
1016
1017 static inline bool msg_peer_node_is_up(struct tipc_msg *m)
1018 {
1019         if (msg_peer_link_is_up(m))
1020                 return true;
1021         return msg_redundant_link(m);
1022 }
1023
1024 static inline bool msg_is_reset(struct tipc_msg *hdr)
1025 {
1026         return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
1027 }
1028
1029 static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
1030 {
1031         return msg_word(m, 14);
1032 }
1033
1034 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
1035 {
1036         msg_set_word(m, 14, n);
1037 }
1038
1039 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
1040 {
1041         memcpy(msg_data(hdr), id, 16);
1042 }
1043
1044 static inline u8 *msg_node_id(struct tipc_msg *hdr)
1045 {
1046         return (u8 *)msg_data(hdr);
1047 }
1048
1049 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
1050 bool tipc_msg_validate(struct sk_buff **_skb);
1051 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
1052 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
1053                      struct sk_buff_head *xmitq);
1054 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
1055                    u32 hsize, u32 destnode);
1056 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
1057                                 uint data_sz, u32 dnode, u32 onode,
1058                                 u32 dport, u32 oport, int errcode);
1059 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
1060 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
1061 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
1062                           u32 mtu, u32 dnode);
1063 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
1064 int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr,
1065                       int pktmax, struct sk_buff_head *frags);
1066 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
1067                    int offset, int dsz, int mtu, struct sk_buff_head *list);
1068 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
1069 bool tipc_msg_assemble(struct sk_buff_head *list);
1070 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
1071 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
1072                         struct sk_buff_head *cpy);
1073 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
1074                              struct sk_buff *skb);
1075 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);
1076
1077 static inline u16 buf_seqno(struct sk_buff *skb)
1078 {
1079         return msg_seqno(buf_msg(skb));
1080 }
1081
1082 static inline int buf_roundup_len(struct sk_buff *skb)
1083 {
1084         return (skb->len / 1024 + 1) * 1024;
1085 }
1086
1087 /* tipc_skb_peek(): peek and reserve first buffer in list
1088  * @list: list to be peeked in
1089  * Returns pointer to first buffer in list, if any
1090  */
1091 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
1092                                             spinlock_t *lock)
1093 {
1094         struct sk_buff *skb;
1095
1096         spin_lock_bh(lock);
1097         skb = skb_peek(list);
1098         if (skb)
1099                 skb_get(skb);
1100         spin_unlock_bh(lock);
1101         return skb;
1102 }
1103
1104 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations
1105  *                       up to and including 'filter'.
1106  * Note: ignoring previously tried destinations minimizes the risk of
1107  *       contention on the socket lock
1108  * @list: list to be peeked in
1109  * @filter: last destination to be ignored from search
1110  * Returns a destination port number, of applicable.
1111  */
1112 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
1113 {
1114         struct sk_buff *skb;
1115         u32 dport = 0;
1116         bool ignore = true;
1117
1118         spin_lock_bh(&list->lock);
1119         skb_queue_walk(list, skb) {
1120                 dport = msg_destport(buf_msg(skb));
1121                 if (!filter || skb_queue_is_last(list, skb))
1122                         break;
1123                 if (dport == filter)
1124                         ignore = false;
1125                 else if (!ignore)
1126                         break;
1127         }
1128         spin_unlock_bh(&list->lock);
1129         return dport;
1130 }
1131
1132 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
1133  * @list: list to be unlinked from
1134  * @dport: selection criteria for buffer to unlink
1135  */
1136 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
1137                                                u32 dport)
1138 {
1139         struct sk_buff *_skb, *tmp, *skb = NULL;
1140
1141         spin_lock_bh(&list->lock);
1142         skb_queue_walk_safe(list, _skb, tmp) {
1143                 if (msg_destport(buf_msg(_skb)) == dport) {
1144                         __skb_unlink(_skb, list);
1145                         skb = _skb;
1146                         break;
1147                 }
1148         }
1149         spin_unlock_bh(&list->lock);
1150         return skb;
1151 }
1152
1153 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list
1154  * @list: the new list to append. Not lock protected
1155  * @head: target list. Lock protected.
1156  */
1157 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
1158                                               struct sk_buff_head *head)
1159 {
1160         spin_lock_bh(&head->lock);
1161         skb_queue_splice_tail(list, head);
1162         spin_unlock_bh(&head->lock);
1163 }
1164
1165 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
1166  * @list: the new list to add. Lock protected. Will be reinitialized
1167  * @head: target list. Lock protected.
1168  */
1169 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
1170                                                    struct sk_buff_head *head)
1171 {
1172         struct sk_buff_head tmp;
1173
1174         __skb_queue_head_init(&tmp);
1175
1176         spin_lock_bh(&list->lock);
1177         skb_queue_splice_tail_init(list, &tmp);
1178         spin_unlock_bh(&list->lock);
1179         tipc_skb_queue_splice_tail(&tmp, head);
1180 }
1181
1182 /* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
1183  * @list: list to be dequeued from
1184  * @seqno: seqno of the expected msg
1185  *
1186  * returns skb dequeued from the list if its seqno is less than or equal to
1187  * the expected one, otherwise the skb is still hold
1188  *
1189  * Note: must be used with appropriate locks held only
1190  */
1191 static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
1192                                                  u16 seqno)
1193 {
1194         struct sk_buff *skb = skb_peek(list);
1195
1196         if (skb && less_eq(buf_seqno(skb), seqno)) {
1197                 __skb_unlink(skb, list);
1198                 return skb;
1199         }
1200         return NULL;
1201 }
1202
1203 #endif