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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/msg.c: TIPC message header routines | |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 2000-2006, Ericsson AB |
741de3e9 | 5 | * Copyright (c) 2005, 2010-2011, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
b97bf3fd | 38 | #include "msg.h" |
b97bf3fd | 39 | |
23461e83 AS |
40 | u32 tipc_msg_tot_importance(struct tipc_msg *m) |
41 | { | |
42 | if (likely(msg_isdata(m))) { | |
43 | if (likely(msg_orignode(m) == tipc_own_addr)) | |
44 | return msg_importance(m); | |
45 | return msg_importance(m) + 4; | |
46 | } | |
47 | if ((msg_user(m) == MSG_FRAGMENTER) && | |
48 | (msg_type(m) == FIRST_FRAGMENT)) | |
49 | return msg_importance(msg_get_wrapped(m)); | |
50 | return msg_importance(m); | |
51 | } | |
52 | ||
53 | ||
ae8509c4 PG |
54 | void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type, u32 hsize, |
55 | u32 destnode) | |
23461e83 AS |
56 | { |
57 | memset(m, 0, hsize); | |
58 | msg_set_version(m); | |
59 | msg_set_user(m, user); | |
60 | msg_set_hdr_sz(m, hsize); | |
61 | msg_set_size(m, hsize); | |
62 | msg_set_prevnode(m, tipc_own_addr); | |
63 | msg_set_type(m, type); | |
15f4e2b3 AS |
64 | msg_set_orignode(m, tipc_own_addr); |
65 | msg_set_destnode(m, destnode); | |
23461e83 AS |
66 | } |
67 | ||
23461e83 AS |
68 | /** |
69 | * tipc_msg_build - create message using specified header and data | |
70 | * | |
71 | * Note: Caller must not hold any locks in case copy_from_user() is interrupted! | |
72 | * | |
73 | * Returns message data size or errno | |
74 | */ | |
26896904 | 75 | int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect, |
9446b87a | 76 | unsigned int len, int max_size, struct sk_buff **buf) |
23461e83 | 77 | { |
5c0a0fc8 YX |
78 | int dsz, sz, hsz; |
79 | unsigned char *to; | |
23461e83 | 80 | |
9446b87a | 81 | dsz = len; |
5c0a0fc8 | 82 | hsz = msg_hdr_sz(hdr); |
23461e83 AS |
83 | sz = hsz + dsz; |
84 | msg_set_size(hdr, sz); | |
85 | if (unlikely(sz > max_size)) { | |
86 | *buf = NULL; | |
87 | return dsz; | |
88 | } | |
89 | ||
31e3c3f6 | 90 | *buf = tipc_buf_acquire(sz); |
23461e83 AS |
91 | if (!(*buf)) |
92 | return -ENOMEM; | |
93 | skb_copy_to_linear_data(*buf, hdr, hsz); | |
5c0a0fc8 | 94 | to = (*buf)->data + hsz; |
9446b87a | 95 | if (len && memcpy_fromiovecend(to, msg_sect, 0, dsz)) { |
5c0a0fc8 YX |
96 | kfree_skb(*buf); |
97 | *buf = NULL; | |
98 | return -EFAULT; | |
23461e83 | 99 | } |
5c0a0fc8 | 100 | return dsz; |
23461e83 | 101 | } |