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 int msg_ack_required(struct tipc_msg *m) 294 { 295 return msg_bits(m, 0, 18, 1); 296 } 297 298 static inline void msg_set_ack_required(struct tipc_msg *m, u32 d) 299 { 300 msg_set_bits(m, 0, 18, 1, d); 301 } 302 303 static inline bool msg_is_rcast(struct tipc_msg *m) 304 { 305 return msg_bits(m, 0, 18, 0x1); 306 } 307 308 static inline void msg_set_is_rcast(struct tipc_msg *m, bool d) 309 { 310 msg_set_bits(m, 0, 18, 0x1, d); 311 } 312 313 static inline void msg_set_size(struct tipc_msg *m, u32 sz) 314 { 315 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz); 316 } 317 318 static inline unchar *msg_data(struct tipc_msg *m) 319 { 320 return ((unchar *)m) + msg_hdr_sz(m); 321 } 322 323 static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m) 324 { 325 return (struct tipc_msg *)msg_data(m); 326 } 327 328 /* 329 * Word 1 330 */ 331 static inline u32 msg_type(struct tipc_msg *m) 332 { 333 return msg_bits(m, 1, 29, 0x7); 334 } 335 336 static inline void msg_set_type(struct tipc_msg *m, u32 n) 337 { 338 msg_set_bits(m, 1, 29, 0x7, n); 339 } 340 341 static inline int msg_in_group(struct tipc_msg *m) 342 { 343 int mtyp = msg_type(m); 344 345 return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG; 346 } 347 348 static inline bool msg_is_grp_evt(struct tipc_msg *m) 349 { 350 return msg_type(m) == TIPC_GRP_MEMBER_EVT; 351 } 352 353 static inline u32 msg_named(struct tipc_msg *m) 354 { 355 return msg_type(m) == TIPC_NAMED_MSG; 356 } 357 358 static inline u32 msg_mcast(struct tipc_msg *m) 359 { 360 int mtyp = msg_type(m); 361 362 return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) || 363 (mtyp == TIPC_GRP_MCAST_MSG)); 364 } 365 366 static inline u32 msg_connected(struct tipc_msg *m) 367 { 368 return msg_type(m) == TIPC_CONN_MSG; 369 } 370 371 static inline u32 msg_errcode(struct tipc_msg *m) 372 { 373 return msg_bits(m, 1, 25, 0xf); 374 } 375 376 static inline void msg_set_errcode(struct tipc_msg *m, u32 err) 377 { 378 msg_set_bits(m, 1, 25, 0xf, err); 379 } 380 381 static inline u32 msg_reroute_cnt(struct tipc_msg *m) 382 { 383 return msg_bits(m, 1, 21, 0xf); 384 } 385 386 static inline void msg_incr_reroute_cnt(struct tipc_msg *m) 387 { 388 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1); 389 } 390 391 static inline void msg_reset_reroute_cnt(struct tipc_msg *m) 392 { 393 msg_set_bits(m, 1, 21, 0xf, 0); 394 } 395 396 static inline u32 msg_lookup_scope(struct tipc_msg *m) 397 { 398 return msg_bits(m, 1, 19, 0x3); 399 } 400 401 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n) 402 { 403 msg_set_bits(m, 1, 19, 0x3, n); 404 } 405 406 static inline u16 msg_bcast_ack(struct tipc_msg *m) 407 { 408 return msg_bits(m, 1, 0, 0xffff); 409 } 410 411 static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n) 412 { 413 msg_set_bits(m, 1, 0, 0xffff, n); 414 } 415 416 /* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch 417 * link peer session number 418 */ 419 static inline bool msg_dest_session_valid(struct tipc_msg *m) 420 { 421 return msg_bits(m, 1, 16, 0x1); 422 } 423 424 static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid) 425 { 426 msg_set_bits(m, 1, 16, 0x1, valid); 427 } 428 429 static inline u16 msg_dest_session(struct tipc_msg *m) 430 { 431 return msg_bits(m, 1, 0, 0xffff); 432 } 433 434 static inline void msg_set_dest_session(struct tipc_msg *m, u16 n) 435 { 436 msg_set_bits(m, 1, 0, 0xffff, n); 437 } 438 439 /* 440 * Word 2 441 */ 442 static inline u16 msg_ack(struct tipc_msg *m) 443 { 444 return msg_bits(m, 2, 16, 0xffff); 445 } 446 447 static inline void msg_set_ack(struct tipc_msg *m, u16 n) 448 { 449 msg_set_bits(m, 2, 16, 0xffff, n); 450 } 451 452 static inline u16 msg_seqno(struct tipc_msg *m) 453 { 454 return msg_bits(m, 2, 0, 0xffff); 455 } 456 457 static inline void msg_set_seqno(struct tipc_msg *m, u16 n) 458 { 459 msg_set_bits(m, 2, 0, 0xffff, n); 460 } 461 462 /* 463 * Words 3-10 464 */ 465 static inline u32 msg_importance(struct tipc_msg *m) 466 { 467 int usr = msg_user(m); 468 469 if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m))) 470 return usr; 471 if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)) 472 return msg_bits(m, 9, 0, 0x7); 473 return TIPC_SYSTEM_IMPORTANCE; 474 } 475 476 static inline void msg_set_importance(struct tipc_msg *m, u32 i) 477 { 478 int usr = msg_user(m); 479 480 if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))) 481 msg_set_bits(m, 9, 0, 0x7, i); 482 else if (i < TIPC_SYSTEM_IMPORTANCE) 483 msg_set_user(m, i); 484 else 485 pr_warn("Trying to set illegal importance in message\n"); 486 } 487 488 static inline u32 msg_prevnode(struct tipc_msg *m) 489 { 490 return msg_word(m, 3); 491 } 492 493 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a) 494 { 495 msg_set_word(m, 3, a); 496 } 497 498 static inline u32 msg_origport(struct tipc_msg *m) 499 { 500 if (msg_user(m) == MSG_FRAGMENTER) 501 m = msg_inner_hdr(m); 502 return msg_word(m, 4); 503 } 504 505 static inline void msg_set_origport(struct tipc_msg *m, u32 p) 506 { 507 msg_set_word(m, 4, p); 508 } 509 510 static inline u32 msg_destport(struct tipc_msg *m) 511 { 512 return msg_word(m, 5); 513 } 514 515 static inline void msg_set_destport(struct tipc_msg *m, u32 p) 516 { 517 msg_set_word(m, 5, p); 518 } 519 520 static inline u32 msg_mc_netid(struct tipc_msg *m) 521 { 522 return msg_word(m, 5); 523 } 524 525 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p) 526 { 527 msg_set_word(m, 5, p); 528 } 529 530 static inline int msg_short(struct tipc_msg *m) 531 { 532 return msg_hdr_sz(m) == SHORT_H_SIZE; 533 } 534 535 static inline u32 msg_orignode(struct tipc_msg *m) 536 { 537 if (likely(msg_short(m))) 538 return msg_prevnode(m); 539 return msg_word(m, 6); 540 } 541 542 static inline void msg_set_orignode(struct tipc_msg *m, u32 a) 543 { 544 msg_set_word(m, 6, a); 545 } 546 547 static inline u32 msg_destnode(struct tipc_msg *m) 548 { 549 return msg_word(m, 7); 550 } 551 552 static inline void msg_set_destnode(struct tipc_msg *m, u32 a) 553 { 554 msg_set_word(m, 7, a); 555 } 556 557 static inline u32 msg_nametype(struct tipc_msg *m) 558 { 559 return msg_word(m, 8); 560 } 561 562 static inline void msg_set_nametype(struct tipc_msg *m, u32 n) 563 { 564 msg_set_word(m, 8, n); 565 } 566 567 static inline u32 msg_nameinst(struct tipc_msg *m) 568 { 569 return msg_word(m, 9); 570 } 571 572 static inline u32 msg_namelower(struct tipc_msg *m) 573 { 574 return msg_nameinst(m); 575 } 576 577 static inline void msg_set_namelower(struct tipc_msg *m, u32 n) 578 { 579 msg_set_word(m, 9, n); 580 } 581 582 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n) 583 { 584 msg_set_namelower(m, n); 585 } 586 587 static inline u32 msg_nameupper(struct tipc_msg *m) 588 { 589 return msg_word(m, 10); 590 } 591 592 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n) 593 { 594 msg_set_word(m, 10, n); 595 } 596 597 /* 598 * Constants and routines used to read and write TIPC internal message headers 599 */ 600 601 /* 602 * Connection management protocol message types 603 */ 604 #define CONN_PROBE 0 605 #define CONN_PROBE_REPLY 1 606 #define CONN_ACK 2 607 608 /* 609 * Name distributor message types 610 */ 611 #define PUBLICATION 0 612 #define WITHDRAWAL 1 613 614 /* 615 * Segmentation message types 616 */ 617 #define FIRST_FRAGMENT 0 618 #define FRAGMENT 1 619 #define LAST_FRAGMENT 2 620 621 /* 622 * Link management protocol message types 623 */ 624 #define STATE_MSG 0 625 #define RESET_MSG 1 626 #define ACTIVATE_MSG 2 627 628 /* 629 * Changeover tunnel message types 630 */ 631 #define SYNCH_MSG 0 632 #define FAILOVER_MSG 1 633 634 /* 635 * Config protocol message types 636 */ 637 #define DSC_REQ_MSG 0 638 #define DSC_RESP_MSG 1 639 #define DSC_TRIAL_MSG 2 640 #define DSC_TRIAL_FAIL_MSG 3 641 642 /* 643 * Group protocol message types 644 */ 645 #define GRP_JOIN_MSG 0 646 #define GRP_LEAVE_MSG 1 647 #define GRP_ADV_MSG 2 648 #define GRP_ACK_MSG 3 649 #define GRP_RECLAIM_MSG 4 650 #define GRP_REMIT_MSG 5 651 652 /* 653 * Word 1 654 */ 655 static inline u32 msg_seq_gap(struct tipc_msg *m) 656 { 657 return msg_bits(m, 1, 16, 0x1fff); 658 } 659 660 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n) 661 { 662 msg_set_bits(m, 1, 16, 0x1fff, n); 663 } 664 665 static inline u32 msg_node_sig(struct tipc_msg *m) 666 { 667 return msg_bits(m, 1, 0, 0xffff); 668 } 669 670 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n) 671 { 672 msg_set_bits(m, 1, 0, 0xffff, n); 673 } 674 675 static inline u32 msg_node_capabilities(struct tipc_msg *m) 676 { 677 return msg_bits(m, 1, 15, 0x1fff); 678 } 679 680 static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n) 681 { 682 msg_set_bits(m, 1, 15, 0x1fff, n); 683 } 684 685 /* 686 * Word 2 687 */ 688 static inline u32 msg_dest_domain(struct tipc_msg *m) 689 { 690 return msg_word(m, 2); 691 } 692 693 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n) 694 { 695 msg_set_word(m, 2, n); 696 } 697 698 static inline u32 msg_bcgap_after(struct tipc_msg *m) 699 { 700 return msg_bits(m, 2, 16, 0xffff); 701 } 702 703 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n) 704 { 705 msg_set_bits(m, 2, 16, 0xffff, n); 706 } 707 708 static inline u32 msg_bcgap_to(struct tipc_msg *m) 709 { 710 return msg_bits(m, 2, 0, 0xffff); 711 } 712 713 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n) 714 { 715 msg_set_bits(m, 2, 0, 0xffff, n); 716 } 717 718 /* 719 * Word 4 720 */ 721 static inline u32 msg_last_bcast(struct tipc_msg *m) 722 { 723 return msg_bits(m, 4, 16, 0xffff); 724 } 725 726 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m) 727 { 728 return msg_last_bcast(m) + 1; 729 } 730 731 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n) 732 { 733 msg_set_bits(m, 4, 16, 0xffff, n); 734 } 735 736 static inline u32 msg_nof_fragms(struct tipc_msg *m) 737 { 738 return msg_bits(m, 4, 0, 0xffff); 739 } 740 741 static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n) 742 { 743 msg_set_bits(m, 4, 0, 0xffff, n); 744 } 745 746 static inline u32 msg_fragm_no(struct tipc_msg *m) 747 { 748 return msg_bits(m, 4, 16, 0xffff); 749 } 750 751 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n) 752 { 753 msg_set_bits(m, 4, 16, 0xffff, n); 754 } 755 756 static inline u16 msg_next_sent(struct tipc_msg *m) 757 { 758 return msg_bits(m, 4, 0, 0xffff); 759 } 760 761 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n) 762 { 763 msg_set_bits(m, 4, 0, 0xffff, n); 764 } 765 766 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n) 767 { 768 msg_set_bits(m, 4, 0, 0xffff, n); 769 } 770 771 static inline u32 msg_bc_netid(struct tipc_msg *m) 772 { 773 return msg_word(m, 4); 774 } 775 776 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id) 777 { 778 msg_set_word(m, 4, id); 779 } 780 781 static inline u32 msg_link_selector(struct tipc_msg *m) 782 { 783 if (msg_user(m) == MSG_FRAGMENTER) 784 m = (void *)msg_data(m); 785 return msg_bits(m, 4, 0, 1); 786 } 787 788 /* 789 * Word 5 790 */ 791 static inline u16 msg_session(struct tipc_msg *m) 792 { 793 return msg_bits(m, 5, 16, 0xffff); 794 } 795 796 static inline void msg_set_session(struct tipc_msg *m, u16 n) 797 { 798 msg_set_bits(m, 5, 16, 0xffff, n); 799 } 800 801 static inline u32 msg_probe(struct tipc_msg *m) 802 { 803 return msg_bits(m, 5, 0, 1); 804 } 805 806 static inline void msg_set_probe(struct tipc_msg *m, u32 val) 807 { 808 msg_set_bits(m, 5, 0, 1, val); 809 } 810 811 static inline char msg_net_plane(struct tipc_msg *m) 812 { 813 return msg_bits(m, 5, 1, 7) + 'A'; 814 } 815 816 static inline void msg_set_net_plane(struct tipc_msg *m, char n) 817 { 818 msg_set_bits(m, 5, 1, 7, (n - 'A')); 819 } 820 821 static inline u32 msg_linkprio(struct tipc_msg *m) 822 { 823 return msg_bits(m, 5, 4, 0x1f); 824 } 825 826 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n) 827 { 828 msg_set_bits(m, 5, 4, 0x1f, n); 829 } 830 831 static inline u32 msg_bearer_id(struct tipc_msg *m) 832 { 833 return msg_bits(m, 5, 9, 0x7); 834 } 835 836 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n) 837 { 838 msg_set_bits(m, 5, 9, 0x7, n); 839 } 840 841 static inline u32 msg_redundant_link(struct tipc_msg *m) 842 { 843 return msg_bits(m, 5, 12, 0x1); 844 } 845 846 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r) 847 { 848 msg_set_bits(m, 5, 12, 0x1, r); 849 } 850 851 static inline u32 msg_peer_stopping(struct tipc_msg *m) 852 { 853 return msg_bits(m, 5, 13, 0x1); 854 } 855 856 static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s) 857 { 858 msg_set_bits(m, 5, 13, 0x1, s); 859 } 860 861 static inline bool msg_bc_ack_invalid(struct tipc_msg *m) 862 { 863 switch (msg_user(m)) { 864 case BCAST_PROTOCOL: 865 case NAME_DISTRIBUTOR: 866 case LINK_PROTOCOL: 867 return msg_bits(m, 5, 14, 0x1); 868 default: 869 return false; 870 } 871 } 872 873 static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid) 874 { 875 msg_set_bits(m, 5, 14, 0x1, invalid); 876 } 877 878 static inline char *msg_media_addr(struct tipc_msg *m) 879 { 880 return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET]; 881 } 882 883 static inline u32 msg_bc_gap(struct tipc_msg *m) 884 { 885 return msg_bits(m, 8, 0, 0x3ff); 886 } 887 888 static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n) 889 { 890 msg_set_bits(m, 8, 0, 0x3ff, n); 891 } 892 893 /* 894 * Word 9 895 */ 896 static inline u16 msg_msgcnt(struct tipc_msg *m) 897 { 898 return msg_bits(m, 9, 16, 0xffff); 899 } 900 901 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n) 902 { 903 msg_set_bits(m, 9, 16, 0xffff, n); 904 } 905 906 static inline u16 msg_syncpt(struct tipc_msg *m) 907 { 908 return msg_bits(m, 9, 16, 0xffff); 909 } 910 911 static inline void msg_set_syncpt(struct tipc_msg *m, u16 n) 912 { 913 msg_set_bits(m, 9, 16, 0xffff, n); 914 } 915 916 static inline u32 msg_conn_ack(struct tipc_msg *m) 917 { 918 return msg_bits(m, 9, 16, 0xffff); 919 } 920 921 static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n) 922 { 923 msg_set_bits(m, 9, 16, 0xffff, n); 924 } 925 926 static inline u16 msg_adv_win(struct tipc_msg *m) 927 { 928 return msg_bits(m, 9, 0, 0xffff); 929 } 930 931 static inline void msg_set_adv_win(struct tipc_msg *m, u16 n) 932 { 933 msg_set_bits(m, 9, 0, 0xffff, n); 934 } 935 936 static inline u32 msg_max_pkt(struct tipc_msg *m) 937 { 938 return msg_bits(m, 9, 16, 0xffff) * 4; 939 } 940 941 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n) 942 { 943 msg_set_bits(m, 9, 16, 0xffff, (n / 4)); 944 } 945 946 static inline u32 msg_link_tolerance(struct tipc_msg *m) 947 { 948 return msg_bits(m, 9, 0, 0xffff); 949 } 950 951 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n) 952 { 953 msg_set_bits(m, 9, 0, 0xffff, n); 954 } 955 956 static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m) 957 { 958 return msg_bits(m, 9, 16, 0xffff); 959 } 960 961 static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n) 962 { 963 msg_set_bits(m, 9, 16, 0xffff, n); 964 } 965 966 static inline u16 msg_grp_bc_acked(struct tipc_msg *m) 967 { 968 return msg_bits(m, 9, 16, 0xffff); 969 } 970 971 static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n) 972 { 973 msg_set_bits(m, 9, 16, 0xffff, n); 974 } 975 976 static inline u16 msg_grp_remitted(struct tipc_msg *m) 977 { 978 return msg_bits(m, 9, 16, 0xffff); 979 } 980 981 static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n) 982 { 983 msg_set_bits(m, 9, 16, 0xffff, n); 984 } 985 986 /* Word 10 987 */ 988 static inline u16 msg_grp_evt(struct tipc_msg *m) 989 { 990 return msg_bits(m, 10, 0, 0x3); 991 } 992 993 static inline void msg_set_grp_evt(struct tipc_msg *m, int n) 994 { 995 msg_set_bits(m, 10, 0, 0x3, n); 996 } 997 998 static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m) 999 { 1000 return msg_bits(m, 10, 0, 0x1); 1001 } 1002 1003 static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n) 1004 { 1005 msg_set_bits(m, 10, 0, 0x1, n); 1006 } 1007 1008 static inline u16 msg_grp_bc_seqno(struct tipc_msg *m) 1009 { 1010 return msg_bits(m, 10, 16, 0xffff); 1011 } 1012 1013 static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n) 1014 { 1015 msg_set_bits(m, 10, 16, 0xffff, n); 1016 } 1017 1018 static inline bool msg_peer_link_is_up(struct tipc_msg *m) 1019 { 1020 if (likely(msg_user(m) != LINK_PROTOCOL)) 1021 return true; 1022 if (msg_type(m) == STATE_MSG) 1023 return true; 1024 return false; 1025 } 1026 1027 static inline bool msg_peer_node_is_up(struct tipc_msg *m) 1028 { 1029 if (msg_peer_link_is_up(m)) 1030 return true; 1031 return msg_redundant_link(m); 1032 } 1033 1034 static inline bool msg_is_reset(struct tipc_msg *hdr) 1035 { 1036 return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG); 1037 } 1038 1039 /* Word 13 1040 */ 1041 static inline void msg_set_peer_net_hash(struct tipc_msg *m, u32 n) 1042 { 1043 msg_set_word(m, 13, n); 1044 } 1045 1046 static inline u32 msg_peer_net_hash(struct tipc_msg *m) 1047 { 1048 return msg_word(m, 13); 1049 } 1050 1051 /* Word 14 1052 */ 1053 static inline u32 msg_sugg_node_addr(struct tipc_msg *m) 1054 { 1055 return msg_word(m, 14); 1056 } 1057 1058 static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n) 1059 { 1060 msg_set_word(m, 14, n); 1061 } 1062 1063 static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id) 1064 { 1065 memcpy(msg_data(hdr), id, 16); 1066 } 1067 1068 static inline u8 *msg_node_id(struct tipc_msg *hdr) 1069 { 1070 return (u8 *)msg_data(hdr); 1071 } 1072 1073 struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp); 1074 bool tipc_msg_validate(struct sk_buff **_skb); 1075 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err); 1076 void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb, 1077 struct sk_buff_head *xmitq); 1078 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type, 1079 u32 hsize, u32 destnode); 1080 struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz, 1081 uint data_sz, u32 dnode, u32 onode, 1082 u32 dport, u32 oport, int errcode); 1083 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf); 1084 bool tipc_msg_try_bundle(struct sk_buff *tskb, struct sk_buff **skb, u32 mss, 1085 u32 dnode, bool *new_bundle); 1086 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos); 1087 int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr, 1088 int pktmax, struct sk_buff_head *frags); 1089 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, 1090 int offset, int dsz, int mtu, struct sk_buff_head *list); 1091 int tipc_msg_append(struct tipc_msg *hdr, struct msghdr *m, int dlen, 1092 int mss, struct sk_buff_head *txq); 1093 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err); 1094 bool tipc_msg_assemble(struct sk_buff_head *list); 1095 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq); 1096 bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg, 1097 struct sk_buff_head *cpy); 1098 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno, 1099 struct sk_buff *skb); 1100 bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy); 1101 1102 static inline u16 buf_seqno(struct sk_buff *skb) 1103 { 1104 return msg_seqno(buf_msg(skb)); 1105 } 1106 1107 static inline int buf_roundup_len(struct sk_buff *skb) 1108 { 1109 return (skb->len / 1024 + 1) * 1024; 1110 } 1111 1112 /* tipc_skb_peek(): peek and reserve first buffer in list 1113 * @list: list to be peeked in 1114 * Returns pointer to first buffer in list, if any 1115 */ 1116 static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list, 1117 spinlock_t *lock) 1118 { 1119 struct sk_buff *skb; 1120 1121 spin_lock_bh(lock); 1122 skb = skb_peek(list); 1123 if (skb) 1124 skb_get(skb); 1125 spin_unlock_bh(lock); 1126 return skb; 1127 } 1128 1129 /* tipc_skb_peek_port(): find a destination port, ignoring all destinations 1130 * up to and including 'filter'. 1131 * Note: ignoring previously tried destinations minimizes the risk of 1132 * contention on the socket lock 1133 * @list: list to be peeked in 1134 * @filter: last destination to be ignored from search 1135 * Returns a destination port number, of applicable. 1136 */ 1137 static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter) 1138 { 1139 struct sk_buff *skb; 1140 u32 dport = 0; 1141 bool ignore = true; 1142 1143 spin_lock_bh(&list->lock); 1144 skb_queue_walk(list, skb) { 1145 dport = msg_destport(buf_msg(skb)); 1146 if (!filter || skb_queue_is_last(list, skb)) 1147 break; 1148 if (dport == filter) 1149 ignore = false; 1150 else if (!ignore) 1151 break; 1152 } 1153 spin_unlock_bh(&list->lock); 1154 return dport; 1155 } 1156 1157 /* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list 1158 * @list: list to be unlinked from 1159 * @dport: selection criteria for buffer to unlink 1160 */ 1161 static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list, 1162 u32 dport) 1163 { 1164 struct sk_buff *_skb, *tmp, *skb = NULL; 1165 1166 spin_lock_bh(&list->lock); 1167 skb_queue_walk_safe(list, _skb, tmp) { 1168 if (msg_destport(buf_msg(_skb)) == dport) { 1169 __skb_unlink(_skb, list); 1170 skb = _skb; 1171 break; 1172 } 1173 } 1174 spin_unlock_bh(&list->lock); 1175 return skb; 1176 } 1177 1178 /* tipc_skb_queue_splice_tail - append an skb list to lock protected list 1179 * @list: the new list to append. Not lock protected 1180 * @head: target list. Lock protected. 1181 */ 1182 static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list, 1183 struct sk_buff_head *head) 1184 { 1185 spin_lock_bh(&head->lock); 1186 skb_queue_splice_tail(list, head); 1187 spin_unlock_bh(&head->lock); 1188 } 1189 1190 /* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists 1191 * @list: the new list to add. Lock protected. Will be reinitialized 1192 * @head: target list. Lock protected. 1193 */ 1194 static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list, 1195 struct sk_buff_head *head) 1196 { 1197 struct sk_buff_head tmp; 1198 1199 __skb_queue_head_init(&tmp); 1200 1201 spin_lock_bh(&list->lock); 1202 skb_queue_splice_tail_init(list, &tmp); 1203 spin_unlock_bh(&list->lock); 1204 tipc_skb_queue_splice_tail(&tmp, head); 1205 } 1206 1207 /* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno 1208 * @list: list to be dequeued from 1209 * @seqno: seqno of the expected msg 1210 * 1211 * returns skb dequeued from the list if its seqno is less than or equal to 1212 * the expected one, otherwise the skb is still hold 1213 * 1214 * Note: must be used with appropriate locks held only 1215 */ 1216 static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list, 1217 u16 seqno) 1218 { 1219 struct sk_buff *skb = skb_peek(list); 1220 1221 if (skb && less_eq(buf_seqno(skb), seqno)) { 1222 __skb_unlink(skb, list); 1223 return skb; 1224 } 1225 return NULL; 1226 } 1227 1228 #endif 1229