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