112 строки
3.6 KiB
C
112 строки
3.6 KiB
C
/*
|
|
* net/tipc/msg.c: TIPC message header routines
|
|
*
|
|
* Copyright (c) 2000-2006, Ericsson AB
|
|
* Copyright (c) 2005, 2010-2011, Wind River Systems
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "core.h"
|
|
#include "msg.h"
|
|
|
|
u32 tipc_msg_tot_importance(struct tipc_msg *m)
|
|
{
|
|
if (likely(msg_isdata(m))) {
|
|
if (likely(msg_orignode(m) == tipc_own_addr))
|
|
return msg_importance(m);
|
|
return msg_importance(m) + 4;
|
|
}
|
|
if ((msg_user(m) == MSG_FRAGMENTER) &&
|
|
(msg_type(m) == FIRST_FRAGMENT))
|
|
return msg_importance(msg_get_wrapped(m));
|
|
return msg_importance(m);
|
|
}
|
|
|
|
|
|
void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
|
|
u32 hsize, u32 destnode)
|
|
{
|
|
memset(m, 0, hsize);
|
|
msg_set_version(m);
|
|
msg_set_user(m, user);
|
|
msg_set_hdr_sz(m, hsize);
|
|
msg_set_size(m, hsize);
|
|
msg_set_prevnode(m, tipc_own_addr);
|
|
msg_set_type(m, type);
|
|
msg_set_orignode(m, tipc_own_addr);
|
|
msg_set_destnode(m, destnode);
|
|
}
|
|
|
|
/**
|
|
* tipc_msg_build - create message using specified header and data
|
|
*
|
|
* Note: Caller must not hold any locks in case copy_from_user() is interrupted!
|
|
*
|
|
* Returns message data size or errno
|
|
*/
|
|
int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
|
|
u32 num_sect, unsigned int total_len,
|
|
int max_size, int usrmem, struct sk_buff **buf)
|
|
{
|
|
int dsz, sz, hsz, pos, res, cnt;
|
|
|
|
dsz = total_len;
|
|
pos = hsz = msg_hdr_sz(hdr);
|
|
sz = hsz + dsz;
|
|
msg_set_size(hdr, sz);
|
|
if (unlikely(sz > max_size)) {
|
|
*buf = NULL;
|
|
return dsz;
|
|
}
|
|
|
|
*buf = tipc_buf_acquire(sz);
|
|
if (!(*buf))
|
|
return -ENOMEM;
|
|
skb_copy_to_linear_data(*buf, hdr, hsz);
|
|
for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
|
|
if (likely(usrmem))
|
|
res = !copy_from_user((*buf)->data + pos,
|
|
msg_sect[cnt].iov_base,
|
|
msg_sect[cnt].iov_len);
|
|
else
|
|
skb_copy_to_linear_data_offset(*buf, pos,
|
|
msg_sect[cnt].iov_base,
|
|
msg_sect[cnt].iov_len);
|
|
pos += msg_sect[cnt].iov_len;
|
|
}
|
|
if (likely(res))
|
|
return dsz;
|
|
|
|
kfree_skb(*buf);
|
|
*buf = NULL;
|
|
return -EFAULT;
|
|
}
|