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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/msg.c: TIPC message header routines
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 2000-2006, Ericsson AB
Allan Stephens741de3e2011-01-25 13:33:31 -05005 * Copyright (c) 2005, 2010-2011, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "msg.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039
Allan Stephens23461e82010-05-11 14:30:18 +000040u32 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
54void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
55 u32 hsize, u32 destnode)
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);
Allan Stephens15f4e2b2011-05-31 14:35:18 -040064 msg_set_orignode(m, tipc_own_addr);
65 msg_set_destnode(m, destnode);
Allan Stephens23461e82010-05-11 14:30:18 +000066}
67
68/**
Allan Stephens23461e82010-05-11 14:30:18 +000069 * 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 */
Allan Stephens26896902011-04-21 10:42:07 -050075int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
76 u32 num_sect, unsigned int total_len,
Allan Stephens0e659672010-12-31 18:59:32 +000077 int max_size, int usrmem, struct sk_buff **buf)
Allan Stephens23461e82010-05-11 14:30:18 +000078{
79 int dsz, sz, hsz, pos, res, cnt;
80
Allan Stephens26896902011-04-21 10:42:07 -050081 dsz = total_len;
Allan Stephens23461e82010-05-11 14:30:18 +000082 pos = hsz = msg_hdr_sz(hdr);
83 sz = hsz + dsz;
84 msg_set_size(hdr, sz);
85 if (unlikely(sz > max_size)) {
86 *buf = NULL;
87 return dsz;
88 }
89
stephen hemminger31e3c3f2010-10-13 13:20:35 +000090 *buf = tipc_buf_acquire(sz);
Allan Stephens23461e82010-05-11 14:30:18 +000091 if (!(*buf))
92 return -ENOMEM;
93 skb_copy_to_linear_data(*buf, hdr, hsz);
94 for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
95 if (likely(usrmem))
96 res = !copy_from_user((*buf)->data + pos,
97 msg_sect[cnt].iov_base,
98 msg_sect[cnt].iov_len);
99 else
100 skb_copy_to_linear_data_offset(*buf, pos,
101 msg_sect[cnt].iov_base,
102 msg_sect[cnt].iov_len);
103 pos += msg_sect[cnt].iov_len;
104 }
105 if (likely(res))
106 return dsz;
107
Allan Stephens5f6d9122011-11-04 13:24:29 -0400108 kfree_skb(*buf);
Allan Stephens23461e82010-05-11 14:30:18 +0000109 *buf = NULL;
110 return -EFAULT;
111}