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1/*
2 * net/tipc/msg.h: Include file for TIPC message header routines
3 *
4 * Copyright (c) 2000-2007, 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 "bearer.h"
41
42/*
43 * Constants and routines used to read and write TIPC payload message headers
44 *
45 * Note: Some items are also used with TIPC internal message headers
46 */
47
48#define TIPC_VERSION 2
49
50/*
51 * Payload message users are defined in TIPC's public API:
52 * - TIPC_LOW_IMPORTANCE
53 * - TIPC_MEDIUM_IMPORTANCE
54 * - TIPC_HIGH_IMPORTANCE
55 * - TIPC_CRITICAL_IMPORTANCE
56 */
57
58/*
59 * Payload message types
60 */
61
62#define TIPC_CONN_MSG 0
63#define TIPC_MCAST_MSG 1
64#define TIPC_NAMED_MSG 2
65#define TIPC_DIRECT_MSG 3
66
67/*
68 * Message header sizes
69 */
70
71#define SHORT_H_SIZE 24 /* In-cluster basic payload message */
72#define BASIC_H_SIZE 32 /* Basic payload message */
73#define NAMED_H_SIZE 40 /* Named payload message */
74#define MCAST_H_SIZE 44 /* Multicast payload message */
75#define INT_H_SIZE 40 /* Internal messages */
76#define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
77#define MAX_H_SIZE 60 /* Largest possible TIPC header size */
78
79#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
80
81
82struct tipc_msg {
83 __be32 hdr[15];
84};
85
86
87static inline u32 msg_word(struct tipc_msg *m, u32 pos)
88{
89 return ntohl(m->hdr[pos]);
90}
91
92static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
93{
94 m->hdr[w] = htonl(val);
95}
96
97static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
98{
99 return (msg_word(m, w) >> pos) & mask;
100}
101
102static inline void msg_set_bits(struct tipc_msg *m, u32 w,
103 u32 pos, u32 mask, u32 val)
104{
105 val = (val & mask) << pos;
106 mask = mask << pos;
107 m->hdr[w] &= ~htonl(mask);
108 m->hdr[w] |= htonl(val);
109}
110
111static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
112{
113 u32 temp = msg->hdr[a];
114
115 msg->hdr[a] = msg->hdr[b];
116 msg->hdr[b] = temp;
117}
118
119/*
120 * Word 0
121 */
122
123static inline u32 msg_version(struct tipc_msg *m)
124{
125 return msg_bits(m, 0, 29, 7);
126}
127
128static inline void msg_set_version(struct tipc_msg *m)
129{
130 msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
131}
132
133static inline u32 msg_user(struct tipc_msg *m)
134{
135 return msg_bits(m, 0, 25, 0xf);
136}
137
138static inline u32 msg_isdata(struct tipc_msg *m)
139{
140 return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
141}
142
143static inline void msg_set_user(struct tipc_msg *m, u32 n)
144{
145 msg_set_bits(m, 0, 25, 0xf, n);
146}
147
148static inline u32 msg_importance(struct tipc_msg *m)
149{
150 return msg_bits(m, 0, 25, 0xf);
151}
152
153static inline void msg_set_importance(struct tipc_msg *m, u32 i)
154{
155 msg_set_user(m, i);
156}
157
158static inline u32 msg_hdr_sz(struct tipc_msg *m)
159{
160 return msg_bits(m, 0, 21, 0xf) << 2;
161}
162
163static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
164{
165 msg_set_bits(m, 0, 21, 0xf, n>>2);
166}
167
168static inline u32 msg_size(struct tipc_msg *m)
169{
170 return msg_bits(m, 0, 0, 0x1ffff);
171}
172
173static inline u32 msg_data_sz(struct tipc_msg *m)
174{
175 return msg_size(m) - msg_hdr_sz(m);
176}
177
178static inline int msg_non_seq(struct tipc_msg *m)
179{
180 return msg_bits(m, 0, 20, 1);
181}
182
183static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
184{
185 msg_set_bits(m, 0, 20, 1, n);
186}
187
188static inline int msg_dest_droppable(struct tipc_msg *m)
189{
190 return msg_bits(m, 0, 19, 1);
191}
192
193static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
194{
195 msg_set_bits(m, 0, 19, 1, d);
196}
197
198static inline int msg_src_droppable(struct tipc_msg *m)
199{
200 return msg_bits(m, 0, 18, 1);
201}
202
203static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
204{
205 msg_set_bits(m, 0, 18, 1, d);
206}
207
208static inline void msg_set_size(struct tipc_msg *m, u32 sz)
209{
210 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
211}
212
213
214/*
215 * Word 1
216 */
217
218static inline u32 msg_type(struct tipc_msg *m)
219{
220 return msg_bits(m, 1, 29, 0x7);
221}
222
223static inline void msg_set_type(struct tipc_msg *m, u32 n)
224{
225 msg_set_bits(m, 1, 29, 0x7, n);
226}
227
228static inline u32 msg_named(struct tipc_msg *m)
229{
230 return msg_type(m) == TIPC_NAMED_MSG;
231}
232
233static inline u32 msg_mcast(struct tipc_msg *m)
234{
235 return msg_type(m) == TIPC_MCAST_MSG;
236}
237
238static inline u32 msg_connected(struct tipc_msg *m)
239{
240 return msg_type(m) == TIPC_CONN_MSG;
241}
242
243static inline u32 msg_errcode(struct tipc_msg *m)
244{
245 return msg_bits(m, 1, 25, 0xf);
246}
247
248static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
249{
250 msg_set_bits(m, 1, 25, 0xf, err);
251}
252
253static inline u32 msg_reroute_cnt(struct tipc_msg *m)
254{
255 return msg_bits(m, 1, 21, 0xf);
256}
257
258static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
259{
260 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
261}
262
263static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
264{
265 msg_set_bits(m, 1, 21, 0xf, 0);
266}
267
268static inline u32 msg_lookup_scope(struct tipc_msg *m)
269{
270 return msg_bits(m, 1, 19, 0x3);
271}
272
273static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
274{
275 msg_set_bits(m, 1, 19, 0x3, n);
276}
277
278static inline u32 msg_bcast_ack(struct tipc_msg *m)
279{
280 return msg_bits(m, 1, 0, 0xffff);
281}
282
283static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
284{
285 msg_set_bits(m, 1, 0, 0xffff, n);
286}
287
288
289/*
290 * Word 2
291 */
292
293static inline u32 msg_ack(struct tipc_msg *m)
294{
295 return msg_bits(m, 2, 16, 0xffff);
296}
297
298static inline void msg_set_ack(struct tipc_msg *m, u32 n)
299{
300 msg_set_bits(m, 2, 16, 0xffff, n);
301}
302
303static inline u32 msg_seqno(struct tipc_msg *m)
304{
305 return msg_bits(m, 2, 0, 0xffff);
306}
307
308static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
309{
310 msg_set_bits(m, 2, 0, 0xffff, n);
311}
312
313/*
314 * Words 3-10
315 */
316
317
318static inline u32 msg_prevnode(struct tipc_msg *m)
319{
320 return msg_word(m, 3);
321}
322
323static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
324{
325 msg_set_word(m, 3, a);
326}
327
328static inline u32 msg_origport(struct tipc_msg *m)
329{
330 return msg_word(m, 4);
331}
332
333static inline void msg_set_origport(struct tipc_msg *m, u32 p)
334{
335 msg_set_word(m, 4, p);
336}
337
338static inline u32 msg_destport(struct tipc_msg *m)
339{
340 return msg_word(m, 5);
341}
342
343static inline void msg_set_destport(struct tipc_msg *m, u32 p)
344{
345 msg_set_word(m, 5, p);
346}
347
348static inline u32 msg_mc_netid(struct tipc_msg *m)
349{
350 return msg_word(m, 5);
351}
352
353static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
354{
355 msg_set_word(m, 5, p);
356}
357
358static inline int msg_short(struct tipc_msg *m)
359{
360 return msg_hdr_sz(m) == SHORT_H_SIZE;
361}
362
363static inline u32 msg_orignode(struct tipc_msg *m)
364{
365 if (likely(msg_short(m)))
366 return msg_prevnode(m);
367 return msg_word(m, 6);
368}
369
370static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
371{
372 msg_set_word(m, 6, a);
373}
374
375static inline u32 msg_destnode(struct tipc_msg *m)
376{
377 return msg_word(m, 7);
378}
379
380static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
381{
382 msg_set_word(m, 7, a);
383}
384
385static inline int msg_is_dest(struct tipc_msg *m, u32 d)
386{
387 return msg_short(m) || (msg_destnode(m) == d);
388}
389
390static inline u32 msg_nametype(struct tipc_msg *m)
391{
392 return msg_word(m, 8);
393}
394
395static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
396{
397 msg_set_word(m, 8, n);
398}
399
400static inline u32 msg_nameinst(struct tipc_msg *m)
401{
402 return msg_word(m, 9);
403}
404
405static inline u32 msg_namelower(struct tipc_msg *m)
406{
407 return msg_nameinst(m);
408}
409
410static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
411{
412 msg_set_word(m, 9, n);
413}
414
415static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
416{
417 msg_set_namelower(m, n);
418}
419
420static inline u32 msg_nameupper(struct tipc_msg *m)
421{
422 return msg_word(m, 10);
423}
424
425static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
426{
427 msg_set_word(m, 10, n);
428}
429
430static inline unchar *msg_data(struct tipc_msg *m)
431{
432 return ((unchar *)m) + msg_hdr_sz(m);
433}
434
435static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
436{
437 return (struct tipc_msg *)msg_data(m);
438}
439
440
441/*
442 * Constants and routines used to read and write TIPC internal message headers
443 */
444
445/*
446 * Internal message users
447 */
448
449#define BCAST_PROTOCOL 5
450#define MSG_BUNDLER 6
451#define LINK_PROTOCOL 7
452#define CONN_MANAGER 8
453#define ROUTE_DISTRIBUTOR 9 /* obsoleted */
454#define CHANGEOVER_PROTOCOL 10
455#define NAME_DISTRIBUTOR 11
456#define MSG_FRAGMENTER 12
457#define LINK_CONFIG 13
458
459/*
460 * Connection management protocol message types
461 */
462
463#define CONN_PROBE 0
464#define CONN_PROBE_REPLY 1
465#define CONN_ACK 2
466
467/*
468 * Name distributor message types
469 */
470
471#define PUBLICATION 0
472#define WITHDRAWAL 1
473
474/*
475 * Segmentation message types
476 */
477
478#define FIRST_FRAGMENT 0
479#define FRAGMENT 1
480#define LAST_FRAGMENT 2
481
482/*
483 * Link management protocol message types
484 */
485
486#define STATE_MSG 0
487#define RESET_MSG 1
488#define ACTIVATE_MSG 2
489
490/*
491 * Changeover tunnel message types
492 */
493#define DUPLICATE_MSG 0
494#define ORIGINAL_MSG 1
495
496/*
497 * Config protocol message types
498 */
499
500#define DSC_REQ_MSG 0
501#define DSC_RESP_MSG 1
502
503
504/*
505 * Word 1
506 */
507
508static inline u32 msg_seq_gap(struct tipc_msg *m)
509{
510 return msg_bits(m, 1, 16, 0x1fff);
511}
512
513static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
514{
515 msg_set_bits(m, 1, 16, 0x1fff, n);
516}
517
518
519/*
520 * Word 2
521 */
522
523static inline u32 msg_dest_domain(struct tipc_msg *m)
524{
525 return msg_word(m, 2);
526}
527
528static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
529{
530 msg_set_word(m, 2, n);
531}
532
533static inline u32 msg_bcgap_after(struct tipc_msg *m)
534{
535 return msg_bits(m, 2, 16, 0xffff);
536}
537
538static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
539{
540 msg_set_bits(m, 2, 16, 0xffff, n);
541}
542
543static inline u32 msg_bcgap_to(struct tipc_msg *m)
544{
545 return msg_bits(m, 2, 0, 0xffff);
546}
547
548static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
549{
550 msg_set_bits(m, 2, 0, 0xffff, n);
551}
552
553
554/*
555 * Word 4
556 */
557
558static inline u32 msg_last_bcast(struct tipc_msg *m)
559{
560 return msg_bits(m, 4, 16, 0xffff);
561}
562
563static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
564{
565 msg_set_bits(m, 4, 16, 0xffff, n);
566}
567
568
569static inline u32 msg_fragm_no(struct tipc_msg *m)
570{
571 return msg_bits(m, 4, 16, 0xffff);
572}
573
574static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
575{
576 msg_set_bits(m, 4, 16, 0xffff, n);
577}
578
579
580static inline u32 msg_next_sent(struct tipc_msg *m)
581{
582 return msg_bits(m, 4, 0, 0xffff);
583}
584
585static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
586{
587 msg_set_bits(m, 4, 0, 0xffff, n);
588}
589
590
591static inline u32 msg_long_msgno(struct tipc_msg *m)
592{
593 return msg_bits(m, 4, 0, 0xffff);
594}
595
596static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
597{
598 msg_set_bits(m, 4, 0, 0xffff, n);
599}
600
601static inline u32 msg_bc_netid(struct tipc_msg *m)
602{
603 return msg_word(m, 4);
604}
605
606static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
607{
608 msg_set_word(m, 4, id);
609}
610
611static inline u32 msg_link_selector(struct tipc_msg *m)
612{
613 return msg_bits(m, 4, 0, 1);
614}
615
616static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
617{
618 msg_set_bits(m, 4, 0, 1, n);
619}
620
621/*
622 * Word 5
623 */
624
625static inline u32 msg_session(struct tipc_msg *m)
626{
627 return msg_bits(m, 5, 16, 0xffff);
628}
629
630static inline void msg_set_session(struct tipc_msg *m, u32 n)
631{
632 msg_set_bits(m, 5, 16, 0xffff, n);
633}
634
635static inline u32 msg_probe(struct tipc_msg *m)
636{
637 return msg_bits(m, 5, 0, 1);
638}
639
640static inline void msg_set_probe(struct tipc_msg *m, u32 val)
641{
642 msg_set_bits(m, 5, 0, 1, val);
643}
644
645static inline char msg_net_plane(struct tipc_msg *m)
646{
647 return msg_bits(m, 5, 1, 7) + 'A';
648}
649
650static inline void msg_set_net_plane(struct tipc_msg *m, char n)
651{
652 msg_set_bits(m, 5, 1, 7, (n - 'A'));
653}
654
655static inline u32 msg_linkprio(struct tipc_msg *m)
656{
657 return msg_bits(m, 5, 4, 0x1f);
658}
659
660static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
661{
662 msg_set_bits(m, 5, 4, 0x1f, n);
663}
664
665static inline u32 msg_bearer_id(struct tipc_msg *m)
666{
667 return msg_bits(m, 5, 9, 0x7);
668}
669
670static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
671{
672 msg_set_bits(m, 5, 9, 0x7, n);
673}
674
675static inline u32 msg_redundant_link(struct tipc_msg *m)
676{
677 return msg_bits(m, 5, 12, 0x1);
678}
679
680static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
681{
682 msg_set_bits(m, 5, 12, 0x1, r);
683}
684
685
686/*
687 * Word 9
688 */
689
690static inline u32 msg_msgcnt(struct tipc_msg *m)
691{
692 return msg_bits(m, 9, 16, 0xffff);
693}
694
695static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
696{
697 msg_set_bits(m, 9, 16, 0xffff, n);
698}
699
700static inline u32 msg_bcast_tag(struct tipc_msg *m)
701{
702 return msg_bits(m, 9, 16, 0xffff);
703}
704
705static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
706{
707 msg_set_bits(m, 9, 16, 0xffff, n);
708}
709
710static inline u32 msg_max_pkt(struct tipc_msg *m)
711{
712 return msg_bits(m, 9, 16, 0xffff) * 4;
713}
714
715static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
716{
717 msg_set_bits(m, 9, 16, 0xffff, (n / 4));
718}
719
720static inline u32 msg_link_tolerance(struct tipc_msg *m)
721{
722 return msg_bits(m, 9, 0, 0xffff);
723}
724
725static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
726{
727 msg_set_bits(m, 9, 0, 0xffff, n);
728}
729
730u32 tipc_msg_tot_importance(struct tipc_msg *m);
731void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
732 u32 hsize, u32 destnode);
733int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
734 u32 num_sect, unsigned int total_len,
735 int max_size, int usrmem, struct sk_buff **buf);
736
737static inline void msg_set_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
738{
739 memcpy(&((int *)m)[5], a, sizeof(*a));
740}
741
742static inline void msg_get_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
743{
744 memcpy(a, &((int *)m)[5], sizeof(*a));
745}
746
747#endif
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