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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
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
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
108 struct 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
120 struct tipc_msg {
121 __be32 hdr[15];
122 };
123
124 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
125 {
126 return (struct tipc_msg *)skb->data;
127 }
128
129 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
130 {
131 return ntohl(m->hdr[pos]);
132 }
133
134 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
135 {
136 m->hdr[w] = htonl(val);
137 }
138
139 static 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
144 static 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
153 static 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 */
164 static inline u32 msg_version(struct tipc_msg *m)
165 {
166 return msg_bits(m, 0, 29, 7);
167 }
168
169 static inline void msg_set_version(struct tipc_msg *m)
170 {
171 msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
172 }
173
174 static inline u32 msg_user(struct tipc_msg *m)
175 {
176 return msg_bits(m, 0, 25, 0xf);
177 }
178
179 static inline u32 msg_isdata(struct tipc_msg *m)
180 {
181 return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
182 }
183
184 static inline void msg_set_user(struct tipc_msg *m, u32 n)
185 {
186 msg_set_bits(m, 0, 25, 0xf, n);
187 }
188
189 static inline u32 msg_hdr_sz(struct tipc_msg *m)
190 {
191 return msg_bits(m, 0, 21, 0xf) << 2;
192 }
193
194 static 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
199 static inline u32 msg_size(struct tipc_msg *m)
200 {
201 return msg_bits(m, 0, 0, 0x1ffff);
202 }
203
204 static inline u32 msg_data_sz(struct tipc_msg *m)
205 {
206 return msg_size(m) - msg_hdr_sz(m);
207 }
208
209 static inline int msg_non_seq(struct tipc_msg *m)
210 {
211 return msg_bits(m, 0, 20, 1);
212 }
213
214 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
215 {
216 msg_set_bits(m, 0, 20, 1, n);
217 }
218
219 static inline int msg_dest_droppable(struct tipc_msg *m)
220 {
221 return msg_bits(m, 0, 19, 1);
222 }
223
224 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
225 {
226 msg_set_bits(m, 0, 19, 1, d);
227 }
228
229 static inline int msg_src_droppable(struct tipc_msg *m)
230 {
231 return msg_bits(m, 0, 18, 1);
232 }
233
234 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
235 {
236 msg_set_bits(m, 0, 18, 1, d);
237 }
238
239 static 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
244 static inline unchar *msg_data(struct tipc_msg *m)
245 {
246 return ((unchar *)m) + msg_hdr_sz(m);
247 }
248
249 static 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 */
257 static inline u32 msg_type(struct tipc_msg *m)
258 {
259 return msg_bits(m, 1, 29, 0x7);
260 }
261
262 static inline void msg_set_type(struct tipc_msg *m, u32 n)
263 {
264 msg_set_bits(m, 1, 29, 0x7, n);
265 }
266
267 static inline u32 msg_named(struct tipc_msg *m)
268 {
269 return msg_type(m) == TIPC_NAMED_MSG;
270 }
271
272 static inline u32 msg_mcast(struct tipc_msg *m)
273 {
274 return msg_type(m) == TIPC_MCAST_MSG;
275 }
276
277 static inline u32 msg_connected(struct tipc_msg *m)
278 {
279 return msg_type(m) == TIPC_CONN_MSG;
280 }
281
282 static inline u32 msg_errcode(struct tipc_msg *m)
283 {
284 return msg_bits(m, 1, 25, 0xf);
285 }
286
287 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
288 {
289 msg_set_bits(m, 1, 25, 0xf, err);
290 }
291
292 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
293 {
294 return msg_bits(m, 1, 21, 0xf);
295 }
296
297 static 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
302 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
303 {
304 msg_set_bits(m, 1, 21, 0xf, 0);
305 }
306
307 static inline u32 msg_lookup_scope(struct tipc_msg *m)
308 {
309 return msg_bits(m, 1, 19, 0x3);
310 }
311
312 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
313 {
314 msg_set_bits(m, 1, 19, 0x3, n);
315 }
316
317 static inline u16 msg_bcast_ack(struct tipc_msg *m)
318 {
319 return msg_bits(m, 1, 0, 0xffff);
320 }
321
322 static 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 */
331 static inline u16 msg_ack(struct tipc_msg *m)
332 {
333 return msg_bits(m, 2, 16, 0xffff);
334 }
335
336 static inline void msg_set_ack(struct tipc_msg *m, u16 n)
337 {
338 msg_set_bits(m, 2, 16, 0xffff, n);
339 }
340
341 static inline u16 msg_seqno(struct tipc_msg *m)
342 {
343 return msg_bits(m, 2, 0, 0xffff);
344 }
345
346 static 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 */
354 static 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
365 static 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
377 static inline u32 msg_prevnode(struct tipc_msg *m)
378 {
379 return msg_word(m, 3);
380 }
381
382 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
383 {
384 msg_set_word(m, 3, a);
385 }
386
387 static 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
394 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
395 {
396 msg_set_word(m, 4, p);
397 }
398
399 static inline u32 msg_destport(struct tipc_msg *m)
400 {
401 return msg_word(m, 5);
402 }
403
404 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
405 {
406 msg_set_word(m, 5, p);
407 }
408
409 static inline u32 msg_mc_netid(struct tipc_msg *m)
410 {
411 return msg_word(m, 5);
412 }
413
414 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
415 {
416 msg_set_word(m, 5, p);
417 }
418
419 static inline int msg_short(struct tipc_msg *m)
420 {
421 return msg_hdr_sz(m) == SHORT_H_SIZE;
422 }
423
424 static 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
431 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
432 {
433 msg_set_word(m, 6, a);
434 }
435
436 static inline u32 msg_destnode(struct tipc_msg *m)
437 {
438 return msg_word(m, 7);
439 }
440
441 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
442 {
443 msg_set_word(m, 7, a);
444 }
445
446 static inline u32 msg_nametype(struct tipc_msg *m)
447 {
448 return msg_word(m, 8);
449 }
450
451 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
452 {
453 msg_set_word(m, 8, n);
454 }
455
456 static inline u32 msg_nameinst(struct tipc_msg *m)
457 {
458 return msg_word(m, 9);
459 }
460
461 static inline u32 msg_namelower(struct tipc_msg *m)
462 {
463 return msg_nameinst(m);
464 }
465
466 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
467 {
468 msg_set_word(m, 9, n);
469 }
470
471 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
472 {
473 msg_set_namelower(m, n);
474 }
475
476 static inline u32 msg_nameupper(struct tipc_msg *m)
477 {
478 return msg_word(m, 10);
479 }
480
481 static 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 */
532 static inline u32 msg_seq_gap(struct tipc_msg *m)
533 {
534 return msg_bits(m, 1, 16, 0x1fff);
535 }
536
537 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
538 {
539 msg_set_bits(m, 1, 16, 0x1fff, n);
540 }
541
542 static inline u32 msg_node_sig(struct tipc_msg *m)
543 {
544 return msg_bits(m, 1, 0, 0xffff);
545 }
546
547 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
548 {
549 msg_set_bits(m, 1, 0, 0xffff, n);
550 }
551
552 static inline u32 msg_node_capabilities(struct tipc_msg *m)
553 {
554 return msg_bits(m, 1, 15, 0x1fff);
555 }
556
557 static 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 */
565 static inline u32 msg_dest_domain(struct tipc_msg *m)
566 {
567 return msg_word(m, 2);
568 }
569
570 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
571 {
572 msg_set_word(m, 2, n);
573 }
574
575 static inline u32 msg_bcgap_after(struct tipc_msg *m)
576 {
577 return msg_bits(m, 2, 16, 0xffff);
578 }
579
580 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
581 {
582 msg_set_bits(m, 2, 16, 0xffff, n);
583 }
584
585 static inline u32 msg_bcgap_to(struct tipc_msg *m)
586 {
587 return msg_bits(m, 2, 0, 0xffff);
588 }
589
590 static 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 */
599 static inline u32 msg_last_bcast(struct tipc_msg *m)
600 {
601 return msg_bits(m, 4, 16, 0xffff);
602 }
603
604 static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
605 {
606 return msg_last_bcast(m) + 1;
607 }
608
609 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
610 {
611 msg_set_bits(m, 4, 16, 0xffff, n);
612 }
613
614 static 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
620 static inline u16 msg_next_sent(struct tipc_msg *m)
621 {
622 return msg_bits(m, 4, 0, 0xffff);
623 }
624
625 static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
626 {
627 msg_set_bits(m, 4, 0, 0xffff, n);
628 }
629
630 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
631 {
632 msg_set_bits(m, 4, 0, 0xffff, n);
633 }
634
635 static inline u32 msg_bc_netid(struct tipc_msg *m)
636 {
637 return msg_word(m, 4);
638 }
639
640 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
641 {
642 msg_set_word(m, 4, id);
643 }
644
645 static inline u32 msg_link_selector(struct tipc_msg *m)
646 {
647 return msg_bits(m, 4, 0, 1);
648 }
649
650 static 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 */
658 static inline u16 msg_session(struct tipc_msg *m)
659 {
660 return msg_bits(m, 5, 16, 0xffff);
661 }
662
663 static inline void msg_set_session(struct tipc_msg *m, u16 n)
664 {
665 msg_set_bits(m, 5, 16, 0xffff, n);
666 }
667
668 static inline u32 msg_probe(struct tipc_msg *m)
669 {
670 return msg_bits(m, 5, 0, 1);
671 }
672
673 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
674 {
675 msg_set_bits(m, 5, 0, 1, val);
676 }
677
678 static inline char msg_net_plane(struct tipc_msg *m)
679 {
680 return msg_bits(m, 5, 1, 7) + 'A';
681 }
682
683 static 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
688 static inline u32 msg_linkprio(struct tipc_msg *m)
689 {
690 return msg_bits(m, 5, 4, 0x1f);
691 }
692
693 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
694 {
695 msg_set_bits(m, 5, 4, 0x1f, n);
696 }
697
698 static inline u32 msg_bearer_id(struct tipc_msg *m)
699 {
700 return msg_bits(m, 5, 9, 0x7);
701 }
702
703 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
704 {
705 msg_set_bits(m, 5, 9, 0x7, n);
706 }
707
708 static inline u32 msg_redundant_link(struct tipc_msg *m)
709 {
710 return msg_bits(m, 5, 12, 0x1);
711 }
712
713 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
714 {
715 msg_set_bits(m, 5, 12, 0x1, r);
716 }
717
718 static 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 */
726 static inline u16 msg_msgcnt(struct tipc_msg *m)
727 {
728 return msg_bits(m, 9, 16, 0xffff);
729 }
730
731 static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
732 {
733 msg_set_bits(m, 9, 16, 0xffff, n);
734 }
735
736 static inline u32 msg_bcast_tag(struct tipc_msg *m)
737 {
738 return msg_bits(m, 9, 16, 0xffff);
739 }
740
741 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
742 {
743 msg_set_bits(m, 9, 16, 0xffff, n);
744 }
745
746 static inline u32 msg_max_pkt(struct tipc_msg *m)
747 {
748 return msg_bits(m, 9, 16, 0xffff) * 4;
749 }
750
751 static 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
756 static inline u32 msg_link_tolerance(struct tipc_msg *m)
757 {
758 return msg_bits(m, 9, 0, 0xffff);
759 }
760
761 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
762 {
763 msg_set_bits(m, 9, 0, 0xffff, n);
764 }
765
766 static 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
775 static 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
782 struct sk_buff *tipc_buf_acquire(u32 size);
783 bool tipc_msg_validate(struct sk_buff *skb);
784 bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
785 void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
786 u32 hsize, u32 destnode);
787 struct 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);
790 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
791 bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
792 bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
793 u32 mtu, u32 dnode);
794 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
795 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
796 int offset, int dsz, int mtu, struct sk_buff_head *list);
797 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
798 bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
799 void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
800 struct sk_buff *skb);
801
802 static 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 */
811 static 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 */
832 static 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 */
856 static 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 */
877 static 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 */
889 static 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