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[TIPC] Moved configuration interface into tipc_config.h
[deliverable/linux.git] / net / tipc / msg.h
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b97bf3fd
PL		 1/*
2 * net/tipc/msg.h: Include file for TIPC message header routines
3 *
4 * Copyright (c) 2003-2005, Ericsson Research Canada
5 * Copyright (c) 2005, Wind River Systems
6 * Copyright (c) 2005-2006, Ericsson AB
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * Redistributions of source code must retain the above copyright notice, this
13 * list of conditions and the following disclaimer.
14 * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#ifndef _TIPC_MSG_H
35#define _TIPC_MSG_H
36
37#include <net/tipc/tipc_msg.h>
38
39#define TIPC_VERSION 2
40#define DATA_LOW TIPC_LOW_IMPORTANCE
41#define DATA_MEDIUM TIPC_MEDIUM_IMPORTANCE
42#define DATA_HIGH TIPC_HIGH_IMPORTANCE
43#define DATA_CRITICAL TIPC_CRITICAL_IMPORTANCE
44#define SHORT_H_SIZE 24 /* Connected,in cluster */
45#define DIR_MSG_H_SIZE 32 /* Directly addressed messages */
46#define CONN_MSG_H_SIZE 36 /* Routed connected msgs*/
47#define LONG_H_SIZE 40 /* Named Messages */
48#define MCAST_H_SIZE 44 /* Multicast messages */
49#define MAX_H_SIZE 60 /* Inclusive full options */
50#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
51#define LINK_CONFIG 13
52
53
54/*
55 TIPC user data message header format, version 2
56
57 - Fundamental definitions available to privileged TIPC users
58 are located in tipc_msg.h.
59 - Remaining definitions available to TIPC internal users appear below.
60*/
61
62
63static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
64{
65 m->hdr[w] = htonl(val);
66}
67
68static inline void msg_set_bits(struct tipc_msg *m, u32 w,
69 u32 pos, u32 mask, u32 val)
70{
71 u32 word = msg_word(m,w) & ~(mask << pos);
72 msg_set_word(m, w, (word |= (val << pos)));
73}
74
75/*
76 * Word 0
77 */
78
79static inline u32 msg_version(struct tipc_msg *m)
80{
81 return msg_bits(m, 0, 29, 7);
82}
83
84static inline void msg_set_version(struct tipc_msg *m)
85{
86 msg_set_bits(m, 0, 29, 0xf, TIPC_VERSION);
87}
88
89static inline u32 msg_user(struct tipc_msg *m)
90{
91 return msg_bits(m, 0, 25, 0xf);
92}
93
94static inline u32 msg_isdata(struct tipc_msg *m)
95{
96 return (msg_user(m) <= DATA_CRITICAL);
97}
98
99static inline void msg_set_user(struct tipc_msg *m, u32 n)
100{
101 msg_set_bits(m, 0, 25, 0xf, n);
102}
103
104static inline void msg_set_importance(struct tipc_msg *m, u32 i)
105{
106 msg_set_user(m, i);
107}
108
109static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n)
110{
111 msg_set_bits(m, 0, 21, 0xf, n>>2);
112}
113
114static inline int msg_non_seq(struct tipc_msg *m)
115{
116 return msg_bits(m, 0, 20, 1);
117}
118
119static inline void msg_set_non_seq(struct tipc_msg *m)
120{
121 msg_set_bits(m, 0, 20, 1, 1);
122}
123
124static inline int msg_dest_droppable(struct tipc_msg *m)
125{
126 return msg_bits(m, 0, 19, 1);
127}
128
129static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
130{
131 msg_set_bits(m, 0, 19, 1, d);
132}
133
134static inline int msg_src_droppable(struct tipc_msg *m)
135{
136 return msg_bits(m, 0, 18, 1);
137}
138
139static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
140{
141 msg_set_bits(m, 0, 18, 1, d);
142}
143
144static inline void msg_set_size(struct tipc_msg *m, u32 sz)
145{
146 m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
147}
148
149
150/*
151 * Word 1
152 */
153
154static inline void msg_set_type(struct tipc_msg *m, u32 n)
155{
156 msg_set_bits(m, 1, 29, 0x7, n);
157}
158
159static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
160{
161 msg_set_bits(m, 1, 25, 0xf, err);
162}
163
164static inline u32 msg_reroute_cnt(struct tipc_msg *m)
165{
166 return msg_bits(m, 1, 21, 0xf);
167}
168
169static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
170{
171 msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
172}
173
174static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
175{
176 msg_set_bits(m, 1, 21, 0xf, 0);
177}
178
179static inline u32 msg_lookup_scope(struct tipc_msg *m)
180{
181 return msg_bits(m, 1, 19, 0x3);
182}
183
184static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
185{
186 msg_set_bits(m, 1, 19, 0x3, n);
187}
188
189static inline void msg_set_options(struct tipc_msg *m, const char *opt, u32 sz)
190{
191 u32 hsz = msg_hdr_sz(m);
192 char *to = (char *)&m->hdr[hsz/4];
193
194 if ((hsz < DIR_MSG_H_SIZE) || ((hsz + sz) > MAX_H_SIZE))
195 return;
196 msg_set_bits(m, 1, 16, 0x7, (hsz - 28)/4);
197 msg_set_hdr_sz(m, hsz + sz);
198 memcpy(to, opt, sz);
199}
200
201static inline u32 msg_bcast_ack(struct tipc_msg *m)
202{
203 return msg_bits(m, 1, 0, 0xffff);
204}
205
206static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
207{
208 msg_set_bits(m, 1, 0, 0xffff, n);
209}
210
211
212/*
213 * Word 2
214 */
215
216static inline u32 msg_ack(struct tipc_msg *m)
217{
218 return msg_bits(m, 2, 16, 0xffff);
219}
220
221static inline void msg_set_ack(struct tipc_msg *m, u32 n)
222{
223 msg_set_bits(m, 2, 16, 0xffff, n);
224}
225
226static inline u32 msg_seqno(struct tipc_msg *m)
227{
228 return msg_bits(m, 2, 0, 0xffff);
229}
230
231static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
232{
233 msg_set_bits(m, 2, 0, 0xffff, n);
234}
235
236
237/*
238 * Words 3-10
239 */
240
241
242static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
243{
244 msg_set_word(m, 3, a);
245}
246
247static inline void msg_set_origport(struct tipc_msg *m, u32 p)
248{
249 msg_set_word(m, 4, p);
250}
251
252static inline void msg_set_destport(struct tipc_msg *m, u32 p)
253{
254 msg_set_word(m, 5, p);
255}
256
257static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
258{
259 msg_set_word(m, 5, p);
260}
261
262static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
263{
264 msg_set_word(m, 6, a);
265}
266
267static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
268{
269 msg_set_word(m, 7, a);
270}
271
272static inline int msg_is_dest(struct tipc_msg *m, u32 d)
273{
274 return(msg_short(m) || (msg_destnode(m) == d));
275}
276
277static inline u32 msg_routed(struct tipc_msg *m)
278{
279 if (likely(msg_short(m)))
280 return 0;
281 return(msg_destnode(m) ^ msg_orignode(m)) >> 11;
282}
283
284static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
285{
286 msg_set_word(m, 8, n);
287}
288
289static inline u32 msg_transp_seqno(struct tipc_msg *m)
290{
291 return msg_word(m, 8);
292}
293
294static inline void msg_set_timestamp(struct tipc_msg *m, u32 n)
295{
296 msg_set_word(m, 8, n);
297}
298
299static inline u32 msg_timestamp(struct tipc_msg *m)
300{
301 return msg_word(m, 8);
302}
303
304static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n)
305{
306 msg_set_word(m, 8, n);
307}
308
309static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
310{
311 msg_set_word(m, 9, n);
312}
313
314static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
315{
316 msg_set_namelower(m, n);
317}
318
319static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
320{
321 msg_set_word(m, 10, n);
322}
323
324static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
325{
326 return (struct tipc_msg *)msg_data(m);
327}
328
329static inline void msg_expand(struct tipc_msg *m, u32 destnode)
330{
331 if (!msg_short(m))
332 return;
333 msg_set_hdr_sz(m, LONG_H_SIZE);
334 msg_set_orignode(m, msg_prevnode(m));
335 msg_set_destnode(m, destnode);
336 memset(&m->hdr[8], 0, 12);
337}
338
339
340
341/*
342 TIPC internal message header format, version 2
343
344 1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0
345 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
346 w0:|vers |msg usr|hdr sz |n|resrv| packet size |
347 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
348 w1:|m typ|rsv=0| sequence gap | broadcast ack no |
349 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
350 w2:| link level ack no/bc_gap_from | seq no / bcast_gap_to |
351 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
352 w3:| previous node |
353 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
354 w4:| next sent broadcast/fragm no | next sent pkt/ fragm msg no |
355 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
356 w5:| session no |rsv=0|r|berid|link prio|netpl|p|
357 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
358 w6:| originating node |
359 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
360 w7:| destination node |
361 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
362 w8:| transport sequence number |
363 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
364 w9:| msg count / bcast tag | link tolerance |
365 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
366 \ \
367 / User Specific Data /
368 \ \
369 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
370
371 NB: CONN_MANAGER use data message format. LINK_CONFIG has own format.
372*/
373
374/*
375 * Internal users
376 */
377
378#define BCAST_PROTOCOL 5
379#define MSG_BUNDLER 6
380#define LINK_PROTOCOL 7
381#define CONN_MANAGER 8
382#define ROUTE_DISTRIBUTOR 9
383#define CHANGEOVER_PROTOCOL 10
384#define NAME_DISTRIBUTOR 11
385#define MSG_FRAGMENTER 12
386#define LINK_CONFIG 13
387#define INT_H_SIZE 40
388#define DSC_H_SIZE 40
389
390/*
391 * Connection management protocol messages
392 */
393
394#define CONN_PROBE 0
395#define CONN_PROBE_REPLY 1
396#define CONN_ACK 2
397
398/*
399 * Name distributor messages
400 */
401
402#define PUBLICATION 0
403#define WITHDRAWAL 1
404
405
406/*
407 * Word 1
408 */
409
410static inline u32 msg_seq_gap(struct tipc_msg *m)
411{
412 return msg_bits(m, 1, 16, 0xff);
413}
414
415static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
416{
417 msg_set_bits(m, 1, 16, 0xff, n);
418}
419
420static inline u32 msg_req_links(struct tipc_msg *m)
421{
422 return msg_bits(m, 1, 16, 0xfff);
423}
424
425static inline void msg_set_req_links(struct tipc_msg *m, u32 n)
426{
427 msg_set_bits(m, 1, 16, 0xfff, n);
428}
429
430
431/*
432 * Word 2
433 */
434
435static inline u32 msg_dest_domain(struct tipc_msg *m)
436{
437 return msg_word(m, 2);
438}
439
440static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
441{
442 msg_set_word(m, 2, n);
443}
444
445static inline u32 msg_bcgap_after(struct tipc_msg *m)
446{
447 return msg_bits(m, 2, 16, 0xffff);
448}
449
450static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
451{
452 msg_set_bits(m, 2, 16, 0xffff, n);
453}
454
455static inline u32 msg_bcgap_to(struct tipc_msg *m)
456{
457 return msg_bits(m, 2, 0, 0xffff);
458}
459
460static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
461{
462 msg_set_bits(m, 2, 0, 0xffff, n);
463}
464
465
466/*
467 * Word 4
468 */
469
470static inline u32 msg_last_bcast(struct tipc_msg *m)
471{
472 return msg_bits(m, 4, 16, 0xffff);
473}
474
475static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
476{
477 msg_set_bits(m, 4, 16, 0xffff, n);
478}
479
480
481static inline u32 msg_fragm_no(struct tipc_msg *m)
482{
483 return msg_bits(m, 4, 16, 0xffff);
484}
485
486static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
487{
488 msg_set_bits(m, 4, 16, 0xffff, n);
489}
490
491
492static inline u32 msg_next_sent(struct tipc_msg *m)
493{
494 return msg_bits(m, 4, 0, 0xffff);
495}
496
497static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
498{
499 msg_set_bits(m, 4, 0, 0xffff, n);
500}
501
502
503static inline u32 msg_long_msgno(struct tipc_msg *m)
504{
505 return msg_bits(m, 4, 0, 0xffff);
506}
507
508static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
509{
510 msg_set_bits(m, 4, 0, 0xffff, n);
511}
512
513static inline u32 msg_bc_netid(struct tipc_msg *m)
514{
515 return msg_word(m, 4);
516}
517
518static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
519{
520 msg_set_word(m, 4, id);
521}
522
523static inline u32 msg_link_selector(struct tipc_msg *m)
524{
525 return msg_bits(m, 4, 0, 1);
526}
527
528static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
529{
530 msg_set_bits(m, 4, 0, 1, (n & 1));
531}
532
533/*
534 * Word 5
535 */
536
537static inline u32 msg_session(struct tipc_msg *m)
538{
539 return msg_bits(m, 5, 16, 0xffff);
540}
541
542static inline void msg_set_session(struct tipc_msg *m, u32 n)
543{
544 msg_set_bits(m, 5, 16, 0xffff, n);
545}
546
547static inline u32 msg_probe(struct tipc_msg *m)
548{
549 return msg_bits(m, 5, 0, 1);
550}
551
552static inline void msg_set_probe(struct tipc_msg *m, u32 val)
553{
554 msg_set_bits(m, 5, 0, 1, (val & 1));
555}
556
557static inline char msg_net_plane(struct tipc_msg *m)
558{
559 return msg_bits(m, 5, 1, 7) + 'A';
560}
561
562static inline void msg_set_net_plane(struct tipc_msg *m, char n)
563{
564 msg_set_bits(m, 5, 1, 7, (n - 'A'));
565}
566
567static inline u32 msg_linkprio(struct tipc_msg *m)
568{
569 return msg_bits(m, 5, 4, 0x1f);
570}
571
572static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
573{
574 msg_set_bits(m, 5, 4, 0x1f, n);
575}
576
577static inline u32 msg_bearer_id(struct tipc_msg *m)
578{
579 return msg_bits(m, 5, 9, 0x7);
580}
581
582static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
583{
584 msg_set_bits(m, 5, 9, 0x7, n);
585}
586
587static inline u32 msg_redundant_link(struct tipc_msg *m)
588{
589 return msg_bits(m, 5, 12, 0x1);
590}
591
592static inline void msg_set_redundant_link(struct tipc_msg *m)
593{
594 msg_set_bits(m, 5, 12, 0x1, 1);
595}
596
597static inline void msg_clear_redundant_link(struct tipc_msg *m)
598{
599 msg_set_bits(m, 5, 12, 0x1, 0);
600}
601
602
603/*
604 * Word 9
605 */
606
607static inline u32 msg_msgcnt(struct tipc_msg *m)
608{
609 return msg_bits(m, 9, 16, 0xffff);
610}
611
612static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
613{
614 msg_set_bits(m, 9, 16, 0xffff, n);
615}
616
617static inline u32 msg_bcast_tag(struct tipc_msg *m)
618{
619 return msg_bits(m, 9, 16, 0xffff);
620}
621
622static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
623{
624 msg_set_bits(m, 9, 16, 0xffff, n);
625}
626
627static inline u32 msg_max_pkt(struct tipc_msg *m)
628{
629 return (msg_bits(m, 9, 16, 0xffff) * 4);
630}
631
632static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
633{
634 msg_set_bits(m, 9, 16, 0xffff, (n / 4));
635}
636
637static inline u32 msg_link_tolerance(struct tipc_msg *m)
638{
639 return msg_bits(m, 9, 0, 0xffff);
640}
641
642static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
643{
644 msg_set_bits(m, 9, 0, 0xffff, n);
645}
646
647/*
648 * Routing table message data
649 */
650
651
652static inline u32 msg_remote_node(struct tipc_msg *m)
653{
654 return msg_word(m, msg_hdr_sz(m)/4);
655}
656
657static inline void msg_set_remote_node(struct tipc_msg *m, u32 a)
658{
659 msg_set_word(m, msg_hdr_sz(m)/4, a);
660}
661
662static inline int msg_dataoctet(struct tipc_msg *m, u32 pos)
663{
664 return(msg_data(m)[pos + 4] != 0);
665}
666
667static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos)
668{
669 msg_data(m)[pos + 4] = 1;
670}
671
672/*
673 * Segmentation message types
674 */
675
676#define FIRST_FRAGMENT 0
677#define FRAGMENT 1
678#define LAST_FRAGMENT 2
679
680/*
681 * Link management protocol message types
682 */
683
684#define STATE_MSG 0
685#define RESET_MSG 1
686#define ACTIVATE_MSG 2
687
688/*
689 * Changeover tunnel message types
690 */
691#define DUPLICATE_MSG 0
692#define ORIGINAL_MSG 1
693
694/*
695 * Routing table message types
696 */
697#define EXT_ROUTING_TABLE 0
698#define LOCAL_ROUTING_TABLE 1
699#define SLAVE_ROUTING_TABLE 2
700#define ROUTE_ADDITION 3
701#define ROUTE_REMOVAL 4
702
703/*
704 * Config protocol message types
705 */
706
707#define DSC_REQ_MSG 0
708#define DSC_RESP_MSG 1
709
710static inline u32 msg_tot_importance(struct tipc_msg *m)
711{
712 if (likely(msg_isdata(m))) {
713 if (likely(msg_orignode(m) == tipc_own_addr))
714 return msg_importance(m);
715 return msg_importance(m) + 4;
716 }
717 if ((msg_user(m) == MSG_FRAGMENTER) &&
718 (msg_type(m) == FIRST_FRAGMENT))
719 return msg_importance(msg_get_wrapped(m));
720 return msg_importance(m);
721}
722
723
724static inline void msg_init(struct tipc_msg *m, u32 user, u32 type,
725 u32 err, u32 hsize, u32 destnode)
726{
727 memset(m, 0, hsize);
728 msg_set_version(m);
729 msg_set_user(m, user);
730 msg_set_hdr_sz(m, hsize);
731 msg_set_size(m, hsize);
732 msg_set_prevnode(m, tipc_own_addr);
733 msg_set_type(m, type);
734 msg_set_errcode(m, err);
735 if (!msg_short(m)) {
736 msg_set_orignode(m, tipc_own_addr);
737 msg_set_destnode(m, destnode);
738 }
739}
740
741/**
742 * msg_calc_data_size - determine total data size for message
743 */
744
745static inline int msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
746{
747 int dsz = 0;
748 int i;
749
750 for (i = 0; i < num_sect; i++)
751 dsz += msg_sect[i].iov_len;
752 return dsz;
753}
754
755/**
756 * msg_build - create message using specified header and data
757 *
758 * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
759 *
760 * Returns message data size or errno
761 */
762
763static inline int msg_build(struct tipc_msg *hdr,
764 struct iovec const *msg_sect, u32 num_sect,
765 int max_size, int usrmem, struct sk_buff** buf)
766{
767 int dsz, sz, hsz, pos, res, cnt;
768
769 dsz = msg_calc_data_size(msg_sect, num_sect);
770 if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
771 *buf = NULL;
772 return -EINVAL;
773 }
774
775 pos = hsz = msg_hdr_sz(hdr);
776 sz = hsz + dsz;
777 msg_set_size(hdr, sz);
778 if (unlikely(sz > max_size)) {
779 *buf = NULL;
780 return dsz;
781 }
782
783 *buf = buf_acquire(sz);
784 if (!(*buf))
785 return -ENOMEM;
786 memcpy((*buf)->data, (unchar *)hdr, hsz);
787 for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
788 if (likely(usrmem))
789 res = !copy_from_user((*buf)->data + pos,
790 msg_sect[cnt].iov_base,
791 msg_sect[cnt].iov_len);
792 else
793 memcpy((*buf)->data + pos, msg_sect[cnt].iov_base,
794 msg_sect[cnt].iov_len);
795 pos += msg_sect[cnt].iov_len;
796 }
797 if (likely(res))
798 return dsz;
799
800 buf_discard(*buf);
801 *buf = NULL;
802 return -EFAULT;
803}
804
805
806struct tipc_media_addr;
807
808extern void msg_set_media_addr(struct tipc_msg *m,
809 struct tipc_media_addr *a);
810
811extern void msg_get_media_addr(struct tipc_msg *m,
812 struct tipc_media_addr *a);
813
814
815#endif
Linux kernel - Deliverables
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