Root/net/tipc/msg.h

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, 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 "core.h"
41
42#define TIPC_VERSION 2
43
44#define SHORT_H_SIZE 24 /* Connected, in-cluster messages */
45#define DIR_MSG_H_SIZE 32 /* Directly addressed messages */
46#define LONG_H_SIZE 40 /* Named messages */
47#define MCAST_H_SIZE 44 /* Multicast messages */
48#define INT_H_SIZE 40 /* Internal messages */
49#define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
50#define MAX_H_SIZE 60 /* Largest possible TIPC header size */
51
52#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
53
54
55/*
56        TIPC user data message header format, version 2
57
58    - Fundamental definitions available to privileged TIPC users
59      are located in tipc_msg.h.
60    - Remaining definitions available to TIPC internal users appear below.
61*/
62
63
64static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
65{
66    m->hdr[w] = htonl(val);
67}
68
69static inline void msg_set_bits(struct tipc_msg *m, u32 w,
70                u32 pos, u32 mask, u32 val)
71{
72    val = (val & mask) << pos;
73    mask = mask << pos;
74    m->hdr[w] &= ~htonl(mask);
75    m->hdr[w] |= htonl(val);
76}
77
78static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
79{
80    u32 temp = msg->hdr[a];
81
82    msg->hdr[a] = msg->hdr[b];
83    msg->hdr[b] = temp;
84}
85
86/*
87 * Word 0
88 */
89
90static inline u32 msg_version(struct tipc_msg *m)
91{
92    return msg_bits(m, 0, 29, 7);
93}
94
95static inline void msg_set_version(struct tipc_msg *m)
96{
97    msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
98}
99
100static inline u32 msg_user(struct tipc_msg *m)
101{
102    return msg_bits(m, 0, 25, 0xf);
103}
104
105static inline u32 msg_isdata(struct tipc_msg *m)
106{
107    return (msg_user(m) <= TIPC_CRITICAL_IMPORTANCE);
108}
109
110static inline void msg_set_user(struct tipc_msg *m, u32 n)
111{
112    msg_set_bits(m, 0, 25, 0xf, n);
113}
114
115static inline void msg_set_importance(struct tipc_msg *m, u32 i)
116{
117    msg_set_user(m, i);
118}
119
120static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n)
121{
122    msg_set_bits(m, 0, 21, 0xf, n>>2);
123}
124
125static inline int msg_non_seq(struct tipc_msg *m)
126{
127    return msg_bits(m, 0, 20, 1);
128}
129
130static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
131{
132    msg_set_bits(m, 0, 20, 1, n);
133}
134
135static inline int msg_dest_droppable(struct tipc_msg *m)
136{
137    return msg_bits(m, 0, 19, 1);
138}
139
140static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
141{
142    msg_set_bits(m, 0, 19, 1, d);
143}
144
145static inline int msg_src_droppable(struct tipc_msg *m)
146{
147    return msg_bits(m, 0, 18, 1);
148}
149
150static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
151{
152    msg_set_bits(m, 0, 18, 1, d);
153}
154
155static inline void msg_set_size(struct tipc_msg *m, u32 sz)
156{
157    m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
158}
159
160
161/*
162 * Word 1
163 */
164
165static inline void msg_set_type(struct tipc_msg *m, u32 n)
166{
167    msg_set_bits(m, 1, 29, 0x7, n);
168}
169
170static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
171{
172    msg_set_bits(m, 1, 25, 0xf, err);
173}
174
175static inline u32 msg_reroute_cnt(struct tipc_msg *m)
176{
177    return msg_bits(m, 1, 21, 0xf);
178}
179
180static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
181{
182    msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
183}
184
185static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
186{
187    msg_set_bits(m, 1, 21, 0xf, 0);
188}
189
190static inline u32 msg_lookup_scope(struct tipc_msg *m)
191{
192    return msg_bits(m, 1, 19, 0x3);
193}
194
195static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
196{
197    msg_set_bits(m, 1, 19, 0x3, n);
198}
199
200static inline u32 msg_bcast_ack(struct tipc_msg *m)
201{
202    return msg_bits(m, 1, 0, 0xffff);
203}
204
205static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
206{
207    msg_set_bits(m, 1, 0, 0xffff, n);
208}
209
210
211/*
212 * Word 2
213 */
214
215static inline u32 msg_ack(struct tipc_msg *m)
216{
217    return msg_bits(m, 2, 16, 0xffff);
218}
219
220static inline void msg_set_ack(struct tipc_msg *m, u32 n)
221{
222    msg_set_bits(m, 2, 16, 0xffff, n);
223}
224
225static inline u32 msg_seqno(struct tipc_msg *m)
226{
227    return msg_bits(m, 2, 0, 0xffff);
228}
229
230static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
231{
232    msg_set_bits(m, 2, 0, 0xffff, n);
233}
234
235/*
236 * TIPC may utilize the "link ack #" and "link seq #" fields of a short
237 * message header to hold the destination node for the message, since the
238 * normal "dest node" field isn't present. This cache is only referenced
239 * when required, so populating the cache of a longer message header is
240 * harmless (as long as the header has the two link sequence fields present).
241 *
242 * Note: Host byte order is OK here, since the info never goes off-card.
243 */
244
245static inline u32 msg_destnode_cache(struct tipc_msg *m)
246{
247    return m->hdr[2];
248}
249
250static inline void msg_set_destnode_cache(struct tipc_msg *m, u32 dnode)
251{
252    m->hdr[2] = dnode;
253}
254
255/*
256 * Words 3-10
257 */
258
259
260static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
261{
262    msg_set_word(m, 3, a);
263}
264
265static inline void msg_set_origport(struct tipc_msg *m, u32 p)
266{
267    msg_set_word(m, 4, p);
268}
269
270static inline void msg_set_destport(struct tipc_msg *m, u32 p)
271{
272    msg_set_word(m, 5, p);
273}
274
275static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
276{
277    msg_set_word(m, 5, p);
278}
279
280static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
281{
282    msg_set_word(m, 6, a);
283}
284
285static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
286{
287    msg_set_word(m, 7, a);
288}
289
290static inline int msg_is_dest(struct tipc_msg *m, u32 d)
291{
292    return(msg_short(m) || (msg_destnode(m) == d));
293}
294
295static inline u32 msg_routed(struct tipc_msg *m)
296{
297    if (likely(msg_short(m)))
298        return 0;
299    return(msg_destnode(m) ^ msg_orignode(m)) >> 11;
300}
301
302static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
303{
304    msg_set_word(m, 8, n);
305}
306
307static inline u32 msg_transp_seqno(struct tipc_msg *m)
308{
309    return msg_word(m, 8);
310}
311
312static inline void msg_set_timestamp(struct tipc_msg *m, u32 n)
313{
314    msg_set_word(m, 8, n);
315}
316
317static inline u32 msg_timestamp(struct tipc_msg *m)
318{
319    return msg_word(m, 8);
320}
321
322static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n)
323{
324    msg_set_word(m, 8, n);
325}
326
327static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
328{
329    msg_set_word(m, 9, n);
330}
331
332static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
333{
334    msg_set_namelower(m, n);
335}
336
337static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
338{
339    msg_set_word(m, 10, n);
340}
341
342static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
343{
344    return (struct tipc_msg *)msg_data(m);
345}
346
347
348/*
349        TIPC internal message header format, version 2
350
351       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
352      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
353   w0:|vers |msg usr|hdr sz |n|resrv| packet size |
354      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
355   w1:|m typ| sequence gap | broadcast ack no |
356      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
357   w2:| link level ack no/bc_gap_from | seq no / bcast_gap_to |
358      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
359   w3:| previous node |
360      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
361   w4:| next sent broadcast/fragm no | next sent pkt/ fragm msg no |
362      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
363   w5:| session no |rsv=0|r|berid|link prio|netpl|p|
364      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
365   w6:| originating node |
366      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
367   w7:| destination node |
368      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
369   w8:| transport sequence number |
370      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
371   w9:| msg count / bcast tag | link tolerance |
372      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
373      \ \
374      / User Specific Data /
375      \ \
376      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
377
378      NB: CONN_MANAGER use data message format. LINK_CONFIG has own format.
379*/
380
381/*
382 * Internal users
383 */
384
385#define BCAST_PROTOCOL 5
386#define MSG_BUNDLER 6
387#define LINK_PROTOCOL 7
388#define CONN_MANAGER 8
389#define ROUTE_DISTRIBUTOR 9
390#define CHANGEOVER_PROTOCOL 10
391#define NAME_DISTRIBUTOR 11
392#define MSG_FRAGMENTER 12
393#define LINK_CONFIG 13
394#define DSC_H_SIZE 40
395
396/*
397 * Connection management protocol messages
398 */
399
400#define CONN_PROBE 0
401#define CONN_PROBE_REPLY 1
402#define CONN_ACK 2
403
404/*
405 * Name distributor messages
406 */
407
408#define PUBLICATION 0
409#define WITHDRAWAL 1
410
411
412/*
413 * Word 1
414 */
415
416static inline u32 msg_seq_gap(struct tipc_msg *m)
417{
418    return msg_bits(m, 1, 16, 0x1fff);
419}
420
421static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
422{
423    msg_set_bits(m, 1, 16, 0x1fff, n);
424}
425
426static inline u32 msg_req_links(struct tipc_msg *m)
427{
428    return msg_bits(m, 1, 16, 0xfff);
429}
430
431static inline void msg_set_req_links(struct tipc_msg *m, u32 n)
432{
433    msg_set_bits(m, 1, 16, 0xfff, n);
434}
435
436
437/*
438 * Word 2
439 */
440
441static inline u32 msg_dest_domain(struct tipc_msg *m)
442{
443    return msg_word(m, 2);
444}
445
446static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
447{
448    msg_set_word(m, 2, n);
449}
450
451static inline u32 msg_bcgap_after(struct tipc_msg *m)
452{
453    return msg_bits(m, 2, 16, 0xffff);
454}
455
456static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
457{
458    msg_set_bits(m, 2, 16, 0xffff, n);
459}
460
461static inline u32 msg_bcgap_to(struct tipc_msg *m)
462{
463    return msg_bits(m, 2, 0, 0xffff);
464}
465
466static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
467{
468    msg_set_bits(m, 2, 0, 0xffff, n);
469}
470
471
472/*
473 * Word 4
474 */
475
476static inline u32 msg_last_bcast(struct tipc_msg *m)
477{
478    return msg_bits(m, 4, 16, 0xffff);
479}
480
481static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
482{
483    msg_set_bits(m, 4, 16, 0xffff, n);
484}
485
486
487static inline u32 msg_fragm_no(struct tipc_msg *m)
488{
489    return msg_bits(m, 4, 16, 0xffff);
490}
491
492static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
493{
494    msg_set_bits(m, 4, 16, 0xffff, n);
495}
496
497
498static inline u32 msg_next_sent(struct tipc_msg *m)
499{
500    return msg_bits(m, 4, 0, 0xffff);
501}
502
503static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
504{
505    msg_set_bits(m, 4, 0, 0xffff, n);
506}
507
508
509static inline u32 msg_long_msgno(struct tipc_msg *m)
510{
511    return msg_bits(m, 4, 0, 0xffff);
512}
513
514static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
515{
516    msg_set_bits(m, 4, 0, 0xffff, n);
517}
518
519static inline u32 msg_bc_netid(struct tipc_msg *m)
520{
521    return msg_word(m, 4);
522}
523
524static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
525{
526    msg_set_word(m, 4, id);
527}
528
529static inline u32 msg_link_selector(struct tipc_msg *m)
530{
531    return msg_bits(m, 4, 0, 1);
532}
533
534static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
535{
536    msg_set_bits(m, 4, 0, 1, (n & 1));
537}
538
539/*
540 * Word 5
541 */
542
543static inline u32 msg_session(struct tipc_msg *m)
544{
545    return msg_bits(m, 5, 16, 0xffff);
546}
547
548static inline void msg_set_session(struct tipc_msg *m, u32 n)
549{
550    msg_set_bits(m, 5, 16, 0xffff, n);
551}
552
553static inline u32 msg_probe(struct tipc_msg *m)
554{
555    return msg_bits(m, 5, 0, 1);
556}
557
558static inline void msg_set_probe(struct tipc_msg *m, u32 val)
559{
560    msg_set_bits(m, 5, 0, 1, (val & 1));
561}
562
563static inline char msg_net_plane(struct tipc_msg *m)
564{
565    return msg_bits(m, 5, 1, 7) + 'A';
566}
567
568static inline void msg_set_net_plane(struct tipc_msg *m, char n)
569{
570    msg_set_bits(m, 5, 1, 7, (n - 'A'));
571}
572
573static inline u32 msg_linkprio(struct tipc_msg *m)
574{
575    return msg_bits(m, 5, 4, 0x1f);
576}
577
578static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
579{
580    msg_set_bits(m, 5, 4, 0x1f, n);
581}
582
583static inline u32 msg_bearer_id(struct tipc_msg *m)
584{
585    return msg_bits(m, 5, 9, 0x7);
586}
587
588static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
589{
590    msg_set_bits(m, 5, 9, 0x7, n);
591}
592
593static inline u32 msg_redundant_link(struct tipc_msg *m)
594{
595    return msg_bits(m, 5, 12, 0x1);
596}
597
598static inline void msg_set_redundant_link(struct tipc_msg *m)
599{
600    msg_set_bits(m, 5, 12, 0x1, 1);
601}
602
603static inline void msg_clear_redundant_link(struct tipc_msg *m)
604{
605    msg_set_bits(m, 5, 12, 0x1, 0);
606}
607
608
609/*
610 * Word 9
611 */
612
613static inline u32 msg_msgcnt(struct tipc_msg *m)
614{
615    return msg_bits(m, 9, 16, 0xffff);
616}
617
618static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
619{
620    msg_set_bits(m, 9, 16, 0xffff, n);
621}
622
623static inline u32 msg_bcast_tag(struct tipc_msg *m)
624{
625    return msg_bits(m, 9, 16, 0xffff);
626}
627
628static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
629{
630    msg_set_bits(m, 9, 16, 0xffff, n);
631}
632
633static inline u32 msg_max_pkt(struct tipc_msg *m)
634{
635    return (msg_bits(m, 9, 16, 0xffff) * 4);
636}
637
638static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
639{
640    msg_set_bits(m, 9, 16, 0xffff, (n / 4));
641}
642
643static inline u32 msg_link_tolerance(struct tipc_msg *m)
644{
645    return msg_bits(m, 9, 0, 0xffff);
646}
647
648static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
649{
650    msg_set_bits(m, 9, 0, 0xffff, n);
651}
652
653/*
654 * Routing table message data
655 */
656
657
658static inline u32 msg_remote_node(struct tipc_msg *m)
659{
660    return msg_word(m, msg_hdr_sz(m)/4);
661}
662
663static inline void msg_set_remote_node(struct tipc_msg *m, u32 a)
664{
665    msg_set_word(m, msg_hdr_sz(m)/4, a);
666}
667
668static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos)
669{
670    msg_data(m)[pos + 4] = 1;
671}
672
673/*
674 * Segmentation message types
675 */
676
677#define FIRST_FRAGMENT 0
678#define FRAGMENT 1
679#define LAST_FRAGMENT 2
680
681/*
682 * Link management protocol message types
683 */
684
685#define STATE_MSG 0
686#define RESET_MSG 1
687#define ACTIVATE_MSG 2
688
689/*
690 * Changeover tunnel message types
691 */
692#define DUPLICATE_MSG 0
693#define ORIGINAL_MSG 1
694
695/*
696 * Routing table message types
697 */
698#define EXT_ROUTING_TABLE 0
699#define LOCAL_ROUTING_TABLE 1
700#define SLAVE_ROUTING_TABLE 2
701#define ROUTE_ADDITION 3
702#define ROUTE_REMOVAL 4
703
704/*
705 * Config protocol message types
706 */
707
708#define DSC_REQ_MSG 0
709#define DSC_RESP_MSG 1
710
711static inline u32 msg_tot_importance(struct tipc_msg *m)
712{
713    if (likely(msg_isdata(m))) {
714        if (likely(msg_orignode(m) == tipc_own_addr))
715            return msg_importance(m);
716        return msg_importance(m) + 4;
717    }
718    if ((msg_user(m) == MSG_FRAGMENTER) &&
719        (msg_type(m) == FIRST_FRAGMENT))
720        return msg_importance(msg_get_wrapped(m));
721    return msg_importance(m);
722}
723
724
725static inline void msg_init(struct tipc_msg *m, u32 user, u32 type,
726                u32 hsize, u32 destnode)
727{
728    memset(m, 0, hsize);
729    msg_set_version(m);
730    msg_set_user(m, user);
731    msg_set_hdr_sz(m, hsize);
732    msg_set_size(m, hsize);
733    msg_set_prevnode(m, tipc_own_addr);
734    msg_set_type(m, type);
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    skb_copy_to_linear_data(*buf, 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            skb_copy_to_linear_data_offset(*buf, pos,
794                               msg_sect[cnt].iov_base,
795                               msg_sect[cnt].iov_len);
796        pos += msg_sect[cnt].iov_len;
797    }
798    if (likely(res))
799        return dsz;
800
801    buf_discard(*buf);
802    *buf = NULL;
803    return -EFAULT;
804}
805
806static inline void msg_set_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
807{
808    memcpy(&((int *)m)[5], a, sizeof(*a));
809}
810
811static inline void msg_get_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
812{
813    memcpy(a, &((int*)m)[5], sizeof(*a));
814}
815
816#endif
817

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