1/* 2 * net/tipc/msg.h: Include file for TIPC message header routines 3 * 4 * Copyright (c) 2000-2007, 2014-2015 Ericsson AB 5 * Copyright (c) 2005-2008, 2010-2011, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37#ifndef _TIPC_MSG_H 38#define _TIPC_MSG_H 39 40#include <linux/tipc.h> 41#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 49struct 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 69/* 70 * Internal message users 71 */ 72#define BCAST_PROTOCOL 5 73#define MSG_BUNDLER 6 74#define LINK_PROTOCOL 7 75#define CONN_MANAGER 8 76#define TUNNEL_PROTOCOL 10 77#define NAME_DISTRIBUTOR 11 78#define MSG_FRAGMENTER 12 79#define LINK_CONFIG 13 80#define SOCK_WAKEUP 14 /* pseudo user */ 81 82/* 83 * Message header sizes 84 */ 85#define SHORT_H_SIZE 24 /* In-cluster basic payload message */ 86#define BASIC_H_SIZE 32 /* Basic payload message */ 87#define NAMED_H_SIZE 40 /* Named payload message */ 88#define MCAST_H_SIZE 44 /* Multicast payload message */ 89#define INT_H_SIZE 40 /* Internal messages */ 90#define MIN_H_SIZE 24 /* Smallest legal TIPC header size */ 91#define MAX_H_SIZE 60 /* Largest possible TIPC header size */ 92 93#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE) 94 95#define TIPC_MEDIA_INFO_OFFSET 5 96 97/** 98 * TIPC message buffer code 99 * 100 * TIPC message buffer headroom reserves space for the worst-case 101 * link-level device header (in case the message is sent off-node). 102 * 103 * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields 104 * are word aligned for quicker access 105 */ 106#define BUF_HEADROOM (LL_MAX_HEADER + 48) 107 108struct tipc_skb_cb { 109 void *handle; 110 struct sk_buff *tail; 111 bool validated; 112 bool wakeup_pending; 113 u16 chain_sz; 114 u16 chain_imp; 115 u16 ackers; 116}; 117 118#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0])) 119 120struct tipc_msg { 121 __be32 hdr[15]; 122}; 123 124static inline struct tipc_msg *buf_msg(struct sk_buff *skb) 125{ 126 return (struct tipc_msg *)skb->data; 127} 128 129static inline u32 msg_word(struct tipc_msg *m, u32 pos) 130{ 131 return ntohl(m->hdr[pos]); 132} 133 134static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val) 135{ 136 m->hdr[w] = htonl(val); 137} 138 139static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask) 140{ 141 return (msg_word(m, w) >> pos) & mask; 142} 143 144static inline void msg_set_bits(struct tipc_msg *m, u32 w, 145 u32 pos, u32 mask, u32 val) 146{ 147 val = (val & mask) << pos; 148 mask = mask << pos; 149 m->hdr[w] &= ~htonl(mask); 150 m->hdr[w] |= htonl(val); 151} 152 153static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b) 154{ 155 u32 temp = msg->hdr[a]; 156 157 msg->hdr[a] = msg->hdr[b]; 158 msg->hdr[b] = temp; 159} 160 161/* 162 * Word 0 163 */ 164static inline u32 msg_version(struct tipc_msg *m) 165{ 166 return msg_bits(m, 0, 29, 7); 167} 168 169static inline void msg_set_version(struct tipc_msg *m) 170{ 171 msg_set_bits(m, 0, 29, 7, TIPC_VERSION); 172} 173 174static inline u32 msg_user(struct tipc_msg *m) 175{ 176 return msg_bits(m, 0, 25, 0xf); 177} 178 179static inline u32 msg_isdata(struct tipc_msg *m) 180{ 181 return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE; 182} 183 184static inline void msg_set_user(struct tipc_msg *m, u32 n) 185{ 186 msg_set_bits(m, 0, 25, 0xf, n); 187} 188 189static inline u32 msg_hdr_sz(struct tipc_msg *m) 190{ 191 return msg_bits(m, 0, 21, 0xf) << 2; 192} 193 194static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n) 195{ 196 msg_set_bits(m, 0, 21, 0xf, n>>2); 197} 198 199static inline u32 msg_size(struct tipc_msg *m) 200{ 201 return msg_bits(m, 0, 0, 0x1ffff); 202} 203 204static inline u32 msg_data_sz(struct tipc_msg *m) 205{ 206 return msg_size(m) - msg_hdr_sz(m); 207} 208 209static inline int msg_non_seq(struct tipc_msg *m) 210{ 211 return msg_bits(m, 0, 20, 1); 212} 213 214static inline void msg_set_non_seq(struct tipc_msg *m, u32 n) 215{ 216 msg_set_bits(m, 0, 20, 1, n); 217} 218 219static inline int msg_dest_droppable(struct tipc_msg *m) 220{ 221 return msg_bits(m, 0, 19, 1); 222} 223 224static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d) 225{ 226 msg_set_bits(m, 0, 19, 1, d); 227} 228 229static inline int msg_src_droppable(struct tipc_msg *m) 230{ 231 return msg_bits(m, 0, 18, 1); 232} 233 234static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d) 235{ 236 msg_set_bits(m, 0, 18, 1, d); 237} 238 239static inline void msg_set_size(struct tipc_msg *m, u32 sz) 240{ 241 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz); 242} 243 244static inline unchar *msg_data(struct tipc_msg *m) 245{ 246 return ((unchar *)m) + msg_hdr_sz(m); 247} 248 249static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m) 250{ 251 return (struct tipc_msg *)msg_data(m); 252} 253 254/* 255 * Word 1 256 */ 257static inline u32 msg_type(struct tipc_msg *m) 258{ 259 return msg_bits(m, 1, 29, 0x7); 260} 261 262static inline void msg_set_type(struct tipc_msg *m, u32 n) 263{ 264 msg_set_bits(m, 1, 29, 0x7, n); 265} 266 267static inline u32 msg_named(struct tipc_msg *m) 268{ 269 return msg_type(m) == TIPC_NAMED_MSG; 270} 271 272static inline u32 msg_mcast(struct tipc_msg *m) 273{ 274 return msg_type(m) == TIPC_MCAST_MSG; 275} 276 277static inline u32 msg_connected(struct tipc_msg *m) 278{ 279 return msg_type(m) == TIPC_CONN_MSG; 280} 281 282static inline u32 msg_errcode(struct tipc_msg *m) 283{ 284 return msg_bits(m, 1, 25, 0xf); 285} 286 287static inline void msg_set_errcode(struct tipc_msg *m, u32 err) 288{ 289 msg_set_bits(m, 1, 25, 0xf, err); 290} 291 292static inline u32 msg_reroute_cnt(struct tipc_msg *m) 293{ 294 return msg_bits(m, 1, 21, 0xf); 295} 296 297static inline void msg_incr_reroute_cnt(struct tipc_msg *m) 298{ 299 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1); 300} 301 302static inline void msg_reset_reroute_cnt(struct tipc_msg *m) 303{ 304 msg_set_bits(m, 1, 21, 0xf, 0); 305} 306 307static inline u32 msg_lookup_scope(struct tipc_msg *m) 308{ 309 return msg_bits(m, 1, 19, 0x3); 310} 311 312static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n) 313{ 314 msg_set_bits(m, 1, 19, 0x3, n); 315} 316 317static inline u16 msg_bcast_ack(struct tipc_msg *m) 318{ 319 return msg_bits(m, 1, 0, 0xffff); 320} 321 322static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n) 323{ 324 msg_set_bits(m, 1, 0, 0xffff, n); 325} 326 327 328/* 329 * Word 2 330 */ 331static inline u16 msg_ack(struct tipc_msg *m) 332{ 333 return msg_bits(m, 2, 16, 0xffff); 334} 335 336static inline void msg_set_ack(struct tipc_msg *m, u16 n) 337{ 338 msg_set_bits(m, 2, 16, 0xffff, n); 339} 340 341static inline u16 msg_seqno(struct tipc_msg *m) 342{ 343 return msg_bits(m, 2, 0, 0xffff); 344} 345 346static inline void msg_set_seqno(struct tipc_msg *m, u16 n) 347{ 348 msg_set_bits(m, 2, 0, 0xffff, n); 349} 350 351/* 352 * Words 3-10 353 */ 354static inline u32 msg_importance(struct tipc_msg *m) 355{ 356 int usr = msg_user(m); 357 358 if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m))) 359 return usr; 360 if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)) 361 return msg_bits(m, 9, 0, 0x7); 362 return TIPC_SYSTEM_IMPORTANCE; 363} 364 365static inline void msg_set_importance(struct tipc_msg *m, u32 i) 366{ 367 int usr = msg_user(m); 368 369 if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))) 370 msg_set_bits(m, 9, 0, 0x7, i); 371 else if (i < TIPC_SYSTEM_IMPORTANCE) 372 msg_set_user(m, i); 373 else 374 pr_warn("Trying to set illegal importance in message\n"); 375} 376 377static inline u32 msg_prevnode(struct tipc_msg *m) 378{ 379 return msg_word(m, 3); 380} 381 382static inline void msg_set_prevnode(struct tipc_msg *m, u32 a) 383{ 384 msg_set_word(m, 3, a); 385} 386 387static inline u32 msg_origport(struct tipc_msg *m) 388{ 389 if (msg_user(m) == MSG_FRAGMENTER) 390 m = msg_get_wrapped(m); 391 return msg_word(m, 4); 392} 393 394static inline void msg_set_origport(struct tipc_msg *m, u32 p) 395{ 396 msg_set_word(m, 4, p); 397} 398 399static inline u32 msg_destport(struct tipc_msg *m) 400{ 401 return msg_word(m, 5); 402} 403 404static inline void msg_set_destport(struct tipc_msg *m, u32 p) 405{ 406 msg_set_word(m, 5, p); 407} 408 409static inline u32 msg_mc_netid(struct tipc_msg *m) 410{ 411 return msg_word(m, 5); 412} 413 414static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p) 415{ 416 msg_set_word(m, 5, p); 417} 418 419static inline int msg_short(struct tipc_msg *m) 420{ 421 return msg_hdr_sz(m) == SHORT_H_SIZE; 422} 423 424static inline u32 msg_orignode(struct tipc_msg *m) 425{ 426 if (likely(msg_short(m))) 427 return msg_prevnode(m); 428 return msg_word(m, 6); 429} 430 431static inline void msg_set_orignode(struct tipc_msg *m, u32 a) 432{ 433 msg_set_word(m, 6, a); 434} 435 436static inline u32 msg_destnode(struct tipc_msg *m) 437{ 438 return msg_word(m, 7); 439} 440 441static inline void msg_set_destnode(struct tipc_msg *m, u32 a) 442{ 443 msg_set_word(m, 7, a); 444} 445 446static inline u32 msg_nametype(struct tipc_msg *m) 447{ 448 return msg_word(m, 8); 449} 450 451static inline void msg_set_nametype(struct tipc_msg *m, u32 n) 452{ 453 msg_set_word(m, 8, n); 454} 455 456static inline u32 msg_nameinst(struct tipc_msg *m) 457{ 458 return msg_word(m, 9); 459} 460 461static inline u32 msg_namelower(struct tipc_msg *m) 462{ 463 return msg_nameinst(m); 464} 465 466static inline void msg_set_namelower(struct tipc_msg *m, u32 n) 467{ 468 msg_set_word(m, 9, n); 469} 470 471static inline void msg_set_nameinst(struct tipc_msg *m, u32 n) 472{ 473 msg_set_namelower(m, n); 474} 475 476static inline u32 msg_nameupper(struct tipc_msg *m) 477{ 478 return msg_word(m, 10); 479} 480 481static inline void msg_set_nameupper(struct tipc_msg *m, u32 n) 482{ 483 msg_set_word(m, 10, n); 484} 485 486/* 487 * Constants and routines used to read and write TIPC internal message headers 488 */ 489 490/* 491 * Connection management protocol message types 492 */ 493#define CONN_PROBE 0 494#define CONN_PROBE_REPLY 1 495#define CONN_ACK 2 496 497/* 498 * Name distributor message types 499 */ 500#define PUBLICATION 0 501#define WITHDRAWAL 1 502 503/* 504 * Segmentation message types 505 */ 506#define FIRST_FRAGMENT 0 507#define FRAGMENT 1 508#define LAST_FRAGMENT 2 509 510/* 511 * Link management protocol message types 512 */ 513#define STATE_MSG 0 514#define RESET_MSG 1 515#define ACTIVATE_MSG 2 516 517/* 518 * Changeover tunnel message types 519 */ 520#define SYNCH_MSG 0 521#define FAILOVER_MSG 1 522 523/* 524 * Config protocol message types 525 */ 526#define DSC_REQ_MSG 0 527#define DSC_RESP_MSG 1 528 529/* 530 * Word 1 531 */ 532static inline u32 msg_seq_gap(struct tipc_msg *m) 533{ 534 return msg_bits(m, 1, 16, 0x1fff); 535} 536 537static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n) 538{ 539 msg_set_bits(m, 1, 16, 0x1fff, n); 540} 541 542static inline u32 msg_node_sig(struct tipc_msg *m) 543{ 544 return msg_bits(m, 1, 0, 0xffff); 545} 546 547static inline void msg_set_node_sig(struct tipc_msg *m, u32 n) 548{ 549 msg_set_bits(m, 1, 0, 0xffff, n); 550} 551 552static inline u32 msg_node_capabilities(struct tipc_msg *m) 553{ 554 return msg_bits(m, 1, 15, 0x1fff); 555} 556 557static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n) 558{ 559 msg_set_bits(m, 1, 15, 0x1fff, n); 560} 561 562/* 563 * Word 2 564 */ 565static inline u32 msg_dest_domain(struct tipc_msg *m) 566{ 567 return msg_word(m, 2); 568} 569 570static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n) 571{ 572 msg_set_word(m, 2, n); 573} 574 575static inline u32 msg_bcgap_after(struct tipc_msg *m) 576{ 577 return msg_bits(m, 2, 16, 0xffff); 578} 579 580static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n) 581{ 582 msg_set_bits(m, 2, 16, 0xffff, n); 583} 584 585static inline u32 msg_bcgap_to(struct tipc_msg *m) 586{ 587 return msg_bits(m, 2, 0, 0xffff); 588} 589 590static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n) 591{ 592 msg_set_bits(m, 2, 0, 0xffff, n); 593} 594 595 596/* 597 * Word 4 598 */ 599static inline u32 msg_last_bcast(struct tipc_msg *m) 600{ 601 return msg_bits(m, 4, 16, 0xffff); 602} 603 604static inline u32 msg_bc_snd_nxt(struct tipc_msg *m) 605{ 606 return msg_last_bcast(m) + 1; 607} 608 609static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n) 610{ 611 msg_set_bits(m, 4, 16, 0xffff, n); 612} 613 614static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n) 615{ 616 msg_set_bits(m, 4, 16, 0xffff, n); 617} 618 619 620static inline u16 msg_next_sent(struct tipc_msg *m) 621{ 622 return msg_bits(m, 4, 0, 0xffff); 623} 624 625static inline void msg_set_next_sent(struct tipc_msg *m, u16 n) 626{ 627 msg_set_bits(m, 4, 0, 0xffff, n); 628} 629 630static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n) 631{ 632 msg_set_bits(m, 4, 0, 0xffff, n); 633} 634 635static inline u32 msg_bc_netid(struct tipc_msg *m) 636{ 637 return msg_word(m, 4); 638} 639 640static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id) 641{ 642 msg_set_word(m, 4, id); 643} 644 645static inline u32 msg_link_selector(struct tipc_msg *m) 646{ 647 return msg_bits(m, 4, 0, 1); 648} 649 650static inline void msg_set_link_selector(struct tipc_msg *m, u32 n) 651{ 652 msg_set_bits(m, 4, 0, 1, n); 653} 654 655/* 656 * Word 5 657 */ 658static inline u16 msg_session(struct tipc_msg *m) 659{ 660 return msg_bits(m, 5, 16, 0xffff); 661} 662 663static inline void msg_set_session(struct tipc_msg *m, u16 n) 664{ 665 msg_set_bits(m, 5, 16, 0xffff, n); 666} 667 668static inline u32 msg_probe(struct tipc_msg *m) 669{ 670 return msg_bits(m, 5, 0, 1); 671} 672 673static inline void msg_set_probe(struct tipc_msg *m, u32 val) 674{ 675 msg_set_bits(m, 5, 0, 1, val); 676} 677 678static inline char msg_net_plane(struct tipc_msg *m) 679{ 680 return msg_bits(m, 5, 1, 7) + 'A'; 681} 682 683static inline void msg_set_net_plane(struct tipc_msg *m, char n) 684{ 685 msg_set_bits(m, 5, 1, 7, (n - 'A')); 686} 687 688static inline u32 msg_linkprio(struct tipc_msg *m) 689{ 690 return msg_bits(m, 5, 4, 0x1f); 691} 692 693static inline void msg_set_linkprio(struct tipc_msg *m, u32 n) 694{ 695 msg_set_bits(m, 5, 4, 0x1f, n); 696} 697 698static inline u32 msg_bearer_id(struct tipc_msg *m) 699{ 700 return msg_bits(m, 5, 9, 0x7); 701} 702 703static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n) 704{ 705 msg_set_bits(m, 5, 9, 0x7, n); 706} 707 708static inline u32 msg_redundant_link(struct tipc_msg *m) 709{ 710 return msg_bits(m, 5, 12, 0x1); 711} 712 713static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r) 714{ 715 msg_set_bits(m, 5, 12, 0x1, r); 716} 717 718static inline char *msg_media_addr(struct tipc_msg *m) 719{ 720 return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET]; 721} 722 723/* 724 * Word 9 725 */ 726static inline u16 msg_msgcnt(struct tipc_msg *m) 727{ 728 return msg_bits(m, 9, 16, 0xffff); 729} 730 731static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n) 732{ 733 msg_set_bits(m, 9, 16, 0xffff, n); 734} 735 736static inline u32 msg_bcast_tag(struct tipc_msg *m) 737{ 738 return msg_bits(m, 9, 16, 0xffff); 739} 740 741static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n) 742{ 743 msg_set_bits(m, 9, 16, 0xffff, n); 744} 745 746static inline u32 msg_max_pkt(struct tipc_msg *m) 747{ 748 return msg_bits(m, 9, 16, 0xffff) * 4; 749} 750 751static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n) 752{ 753 msg_set_bits(m, 9, 16, 0xffff, (n / 4)); 754} 755 756static inline u32 msg_link_tolerance(struct tipc_msg *m) 757{ 758 return msg_bits(m, 9, 0, 0xffff); 759} 760 761static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n) 762{ 763 msg_set_bits(m, 9, 0, 0xffff, n); 764} 765 766static inline bool msg_peer_link_is_up(struct tipc_msg *m) 767{ 768 if (likely(msg_user(m) != LINK_PROTOCOL)) 769 return true; 770 if (msg_type(m) == STATE_MSG) 771 return true; 772 return false; 773} 774 775static inline bool msg_peer_node_is_up(struct tipc_msg *m) 776{ 777 if (msg_peer_link_is_up(m)) 778 return true; 779 return msg_redundant_link(m); 780} 781 782struct sk_buff *tipc_buf_acquire(u32 size); 783bool tipc_msg_validate(struct sk_buff *skb); 784bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err); 785void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type, 786 u32 hsize, u32 destnode); 787struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz, 788 uint data_sz, u32 dnode, u32 onode, 789 u32 dport, u32 oport, int errcode); 790int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf); 791bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu); 792bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg, 793 u32 mtu, u32 dnode); 794bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos); 795int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, 796 int offset, int dsz, int mtu, struct sk_buff_head *list); 797bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err); 798bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq); 799void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno, 800 struct sk_buff *skb); 801 802static inline u16 buf_seqno(struct sk_buff *skb) 803{ 804 return msg_seqno(buf_msg(skb)); 805} 806 807/* tipc_skb_peek(): peek and reserve first buffer in list 808 * @list: list to be peeked in 809 * Returns pointer to first buffer in list, if any 810 */ 811static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list, 812 spinlock_t *lock) 813{ 814 struct sk_buff *skb; 815 816 spin_lock_bh(lock); 817 skb = skb_peek(list); 818 if (skb) 819 skb_get(skb); 820 spin_unlock_bh(lock); 821 return skb; 822} 823 824/* tipc_skb_peek_port(): find a destination port, ignoring all destinations 825 * up to and including 'filter'. 826 * Note: ignoring previously tried destinations minimizes the risk of 827 * contention on the socket lock 828 * @list: list to be peeked in 829 * @filter: last destination to be ignored from search 830 * Returns a destination port number, of applicable. 831 */ 832static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter) 833{ 834 struct sk_buff *skb; 835 u32 dport = 0; 836 bool ignore = true; 837 838 spin_lock_bh(&list->lock); 839 skb_queue_walk(list, skb) { 840 dport = msg_destport(buf_msg(skb)); 841 if (!filter || skb_queue_is_last(list, skb)) 842 break; 843 if (dport == filter) 844 ignore = false; 845 else if (!ignore) 846 break; 847 } 848 spin_unlock_bh(&list->lock); 849 return dport; 850} 851 852/* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list 853 * @list: list to be unlinked from 854 * @dport: selection criteria for buffer to unlink 855 */ 856static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list, 857 u32 dport) 858{ 859 struct sk_buff *_skb, *tmp, *skb = NULL; 860 861 spin_lock_bh(&list->lock); 862 skb_queue_walk_safe(list, _skb, tmp) { 863 if (msg_destport(buf_msg(_skb)) == dport) { 864 __skb_unlink(_skb, list); 865 skb = _skb; 866 break; 867 } 868 } 869 spin_unlock_bh(&list->lock); 870 return skb; 871} 872 873/* tipc_skb_queue_splice_tail - append an skb list to lock protected list 874 * @list: the new list to append. Not lock protected 875 * @head: target list. Lock protected. 876 */ 877static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list, 878 struct sk_buff_head *head) 879{ 880 spin_lock_bh(&head->lock); 881 skb_queue_splice_tail(list, head); 882 spin_unlock_bh(&head->lock); 883} 884 885/* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists 886 * @list: the new list to add. Lock protected. Will be reinitialized 887 * @head: target list. Lock protected. 888 */ 889static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list, 890 struct sk_buff_head *head) 891{ 892 struct sk_buff_head tmp; 893 894 __skb_queue_head_init(&tmp); 895 896 spin_lock_bh(&list->lock); 897 skb_queue_splice_tail_init(list, &tmp); 898 spin_unlock_bh(&list->lock); 899 tipc_skb_queue_splice_tail(&tmp, head); 900} 901 902#endif 903