823 lines
18 KiB
C
823 lines
18 KiB
C
/*
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* net/tipc/msg.h: Include file for TIPC message header routines
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*
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* Copyright (c) 2000-2007, Ericsson AB
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* Copyright (c) 2005-2007, 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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#ifndef _TIPC_MSG_H
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#define _TIPC_MSG_H
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#include "core.h"
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#define TIPC_VERSION 2
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#define DATA_LOW TIPC_LOW_IMPORTANCE
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#define DATA_MEDIUM TIPC_MEDIUM_IMPORTANCE
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#define DATA_HIGH TIPC_HIGH_IMPORTANCE
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#define DATA_CRITICAL TIPC_CRITICAL_IMPORTANCE
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#define SHORT_H_SIZE 24 /* Connected,in cluster */
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#define DIR_MSG_H_SIZE 32 /* Directly addressed messages */
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#define CONN_MSG_H_SIZE 36 /* Routed connected msgs*/
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#define LONG_H_SIZE 40 /* Named Messages */
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#define MCAST_H_SIZE 44 /* Multicast messages */
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#define MAX_H_SIZE 60 /* Inclusive full options */
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#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
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#define LINK_CONFIG 13
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/*
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TIPC user data message header format, version 2
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- Fundamental definitions available to privileged TIPC users
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are located in tipc_msg.h.
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- Remaining definitions available to TIPC internal users appear below.
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*/
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static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
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{
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m->hdr[w] = htonl(val);
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}
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static inline void msg_set_bits(struct tipc_msg *m, u32 w,
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u32 pos, u32 mask, u32 val)
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{
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val = (val & mask) << pos;
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val = htonl(val);
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mask = htonl(mask << pos);
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m->hdr[w] &= ~mask;
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m->hdr[w] |= val;
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}
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/*
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* Word 0
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*/
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static inline u32 msg_version(struct tipc_msg *m)
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{
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return msg_bits(m, 0, 29, 7);
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}
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static inline void msg_set_version(struct tipc_msg *m)
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{
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msg_set_bits(m, 0, 29, 0xf, TIPC_VERSION);
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}
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static inline u32 msg_user(struct tipc_msg *m)
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{
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return msg_bits(m, 0, 25, 0xf);
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}
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static inline u32 msg_isdata(struct tipc_msg *m)
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{
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return (msg_user(m) <= DATA_CRITICAL);
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}
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static inline void msg_set_user(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 0, 25, 0xf, n);
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}
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static inline void msg_set_importance(struct tipc_msg *m, u32 i)
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{
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msg_set_user(m, i);
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}
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static inline void msg_set_hdr_sz(struct tipc_msg *m,u32 n)
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{
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msg_set_bits(m, 0, 21, 0xf, n>>2);
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}
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static inline int msg_non_seq(struct tipc_msg *m)
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{
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return msg_bits(m, 0, 20, 1);
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}
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static inline void msg_set_non_seq(struct tipc_msg *m)
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{
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msg_set_bits(m, 0, 20, 1, 1);
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}
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static inline int msg_dest_droppable(struct tipc_msg *m)
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{
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return msg_bits(m, 0, 19, 1);
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}
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static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
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{
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msg_set_bits(m, 0, 19, 1, d);
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}
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static inline int msg_src_droppable(struct tipc_msg *m)
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{
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return msg_bits(m, 0, 18, 1);
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}
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static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
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{
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msg_set_bits(m, 0, 18, 1, d);
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}
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static inline void msg_set_size(struct tipc_msg *m, u32 sz)
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{
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m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
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}
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/*
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* Word 1
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*/
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static inline void msg_set_type(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 1, 29, 0x7, n);
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}
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static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
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{
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msg_set_bits(m, 1, 25, 0xf, err);
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}
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static inline u32 msg_reroute_cnt(struct tipc_msg *m)
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{
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return msg_bits(m, 1, 21, 0xf);
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}
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static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
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{
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msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
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}
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static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
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{
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msg_set_bits(m, 1, 21, 0xf, 0);
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}
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static inline u32 msg_lookup_scope(struct tipc_msg *m)
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{
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return msg_bits(m, 1, 19, 0x3);
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}
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static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 1, 19, 0x3, n);
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}
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static inline void msg_set_options(struct tipc_msg *m, const char *opt, u32 sz)
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{
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u32 hsz = msg_hdr_sz(m);
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char *to = (char *)&m->hdr[hsz/4];
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if ((hsz < DIR_MSG_H_SIZE) || ((hsz + sz) > MAX_H_SIZE))
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return;
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msg_set_bits(m, 1, 16, 0x7, (hsz - 28)/4);
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msg_set_hdr_sz(m, hsz + sz);
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memcpy(to, opt, sz);
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}
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static inline u32 msg_bcast_ack(struct tipc_msg *m)
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{
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return msg_bits(m, 1, 0, 0xffff);
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}
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static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 1, 0, 0xffff, n);
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}
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/*
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* Word 2
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*/
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static inline u32 msg_ack(struct tipc_msg *m)
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{
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return msg_bits(m, 2, 16, 0xffff);
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}
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static inline void msg_set_ack(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 2, 16, 0xffff, n);
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}
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static inline u32 msg_seqno(struct tipc_msg *m)
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{
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return msg_bits(m, 2, 0, 0xffff);
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}
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static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 2, 0, 0xffff, n);
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}
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/*
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* Words 3-10
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*/
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static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
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{
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msg_set_word(m, 3, a);
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}
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static inline void msg_set_origport(struct tipc_msg *m, u32 p)
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{
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msg_set_word(m, 4, p);
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}
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static inline void msg_set_destport(struct tipc_msg *m, u32 p)
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{
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msg_set_word(m, 5, p);
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}
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static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
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{
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msg_set_word(m, 5, p);
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}
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static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
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{
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msg_set_word(m, 6, a);
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}
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static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
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{
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msg_set_word(m, 7, a);
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}
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static inline int msg_is_dest(struct tipc_msg *m, u32 d)
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{
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return(msg_short(m) || (msg_destnode(m) == d));
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}
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static inline u32 msg_routed(struct tipc_msg *m)
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{
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if (likely(msg_short(m)))
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return 0;
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return(msg_destnode(m) ^ msg_orignode(m)) >> 11;
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}
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static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
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{
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msg_set_word(m, 8, n);
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}
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static inline u32 msg_transp_seqno(struct tipc_msg *m)
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{
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return msg_word(m, 8);
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}
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static inline void msg_set_timestamp(struct tipc_msg *m, u32 n)
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{
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msg_set_word(m, 8, n);
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}
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static inline u32 msg_timestamp(struct tipc_msg *m)
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{
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return msg_word(m, 8);
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}
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static inline void msg_set_transp_seqno(struct tipc_msg *m, u32 n)
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{
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msg_set_word(m, 8, n);
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}
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static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
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{
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msg_set_word(m, 9, n);
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}
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static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
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{
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msg_set_namelower(m, n);
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}
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static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
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{
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msg_set_word(m, 10, n);
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}
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static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
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{
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return (struct tipc_msg *)msg_data(m);
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}
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static inline void msg_expand(struct tipc_msg *m, u32 destnode)
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{
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if (!msg_short(m))
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return;
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msg_set_hdr_sz(m, LONG_H_SIZE);
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msg_set_orignode(m, msg_prevnode(m));
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msg_set_destnode(m, destnode);
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memset(&m->hdr[8], 0, 12);
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}
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/*
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TIPC internal message header format, version 2
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w0:|vers |msg usr|hdr sz |n|resrv| packet size |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w1:|m typ|rsv=0| sequence gap | broadcast ack no |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w2:| link level ack no/bc_gap_from | seq no / bcast_gap_to |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w3:| previous node |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w4:| next sent broadcast/fragm no | next sent pkt/ fragm msg no |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w5:| session no |rsv=0|r|berid|link prio|netpl|p|
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w6:| originating node |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w7:| destination node |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w8:| transport sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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w9:| msg count / bcast tag | link tolerance |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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\ \
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/ User Specific Data /
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\ \
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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NB: CONN_MANAGER use data message format. LINK_CONFIG has own format.
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*/
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/*
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* Internal users
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*/
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#define BCAST_PROTOCOL 5
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#define MSG_BUNDLER 6
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#define LINK_PROTOCOL 7
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#define CONN_MANAGER 8
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#define ROUTE_DISTRIBUTOR 9
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#define CHANGEOVER_PROTOCOL 10
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#define NAME_DISTRIBUTOR 11
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#define MSG_FRAGMENTER 12
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#define LINK_CONFIG 13
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#define INT_H_SIZE 40
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#define DSC_H_SIZE 40
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/*
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* Connection management protocol messages
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*/
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#define CONN_PROBE 0
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#define CONN_PROBE_REPLY 1
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#define CONN_ACK 2
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/*
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* Name distributor messages
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*/
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#define PUBLICATION 0
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#define WITHDRAWAL 1
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/*
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* Word 1
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*/
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static inline u32 msg_seq_gap(struct tipc_msg *m)
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{
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return msg_bits(m, 1, 16, 0xff);
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}
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static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 1, 16, 0xff, n);
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}
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static inline u32 msg_req_links(struct tipc_msg *m)
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{
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return msg_bits(m, 1, 16, 0xfff);
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}
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static inline void msg_set_req_links(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 1, 16, 0xfff, n);
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}
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/*
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* Word 2
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*/
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static inline u32 msg_dest_domain(struct tipc_msg *m)
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{
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return msg_word(m, 2);
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}
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static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
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{
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msg_set_word(m, 2, n);
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}
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static inline u32 msg_bcgap_after(struct tipc_msg *m)
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{
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return msg_bits(m, 2, 16, 0xffff);
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}
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static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 2, 16, 0xffff, n);
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}
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static inline u32 msg_bcgap_to(struct tipc_msg *m)
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{
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return msg_bits(m, 2, 0, 0xffff);
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}
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static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 2, 0, 0xffff, n);
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}
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/*
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* Word 4
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*/
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static inline u32 msg_last_bcast(struct tipc_msg *m)
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{
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return msg_bits(m, 4, 16, 0xffff);
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}
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static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 4, 16, 0xffff, n);
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}
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static inline u32 msg_fragm_no(struct tipc_msg *m)
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{
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return msg_bits(m, 4, 16, 0xffff);
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}
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static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 4, 16, 0xffff, n);
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}
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static inline u32 msg_next_sent(struct tipc_msg *m)
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{
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return msg_bits(m, 4, 0, 0xffff);
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}
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static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 4, 0, 0xffff, n);
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}
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static inline u32 msg_long_msgno(struct tipc_msg *m)
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{
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return msg_bits(m, 4, 0, 0xffff);
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}
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static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
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{
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msg_set_bits(m, 4, 0, 0xffff, n);
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}
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static inline u32 msg_bc_netid(struct tipc_msg *m)
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{
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return msg_word(m, 4);
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}
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static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
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{
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msg_set_word(m, 4, id);
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}
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static inline u32 msg_link_selector(struct tipc_msg *m)
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{
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return msg_bits(m, 4, 0, 1);
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}
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|
|
static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 4, 0, 1, (n & 1));
|
|
}
|
|
|
|
/*
|
|
* Word 5
|
|
*/
|
|
|
|
static inline u32 msg_session(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 5, 16, 0xffff);
|
|
}
|
|
|
|
static inline void msg_set_session(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 5, 16, 0xffff, n);
|
|
}
|
|
|
|
static inline u32 msg_probe(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 5, 0, 1);
|
|
}
|
|
|
|
static inline void msg_set_probe(struct tipc_msg *m, u32 val)
|
|
{
|
|
msg_set_bits(m, 5, 0, 1, (val & 1));
|
|
}
|
|
|
|
static inline char msg_net_plane(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 5, 1, 7) + 'A';
|
|
}
|
|
|
|
static inline void msg_set_net_plane(struct tipc_msg *m, char n)
|
|
{
|
|
msg_set_bits(m, 5, 1, 7, (n - 'A'));
|
|
}
|
|
|
|
static inline u32 msg_linkprio(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 5, 4, 0x1f);
|
|
}
|
|
|
|
static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 5, 4, 0x1f, n);
|
|
}
|
|
|
|
static inline u32 msg_bearer_id(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 5, 9, 0x7);
|
|
}
|
|
|
|
static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 5, 9, 0x7, n);
|
|
}
|
|
|
|
static inline u32 msg_redundant_link(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 5, 12, 0x1);
|
|
}
|
|
|
|
static inline void msg_set_redundant_link(struct tipc_msg *m)
|
|
{
|
|
msg_set_bits(m, 5, 12, 0x1, 1);
|
|
}
|
|
|
|
static inline void msg_clear_redundant_link(struct tipc_msg *m)
|
|
{
|
|
msg_set_bits(m, 5, 12, 0x1, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Word 9
|
|
*/
|
|
|
|
static inline u32 msg_msgcnt(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 9, 16, 0xffff);
|
|
}
|
|
|
|
static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 9, 16, 0xffff, n);
|
|
}
|
|
|
|
static inline u32 msg_bcast_tag(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 9, 16, 0xffff);
|
|
}
|
|
|
|
static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 9, 16, 0xffff, n);
|
|
}
|
|
|
|
static inline u32 msg_max_pkt(struct tipc_msg *m)
|
|
{
|
|
return (msg_bits(m, 9, 16, 0xffff) * 4);
|
|
}
|
|
|
|
static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 9, 16, 0xffff, (n / 4));
|
|
}
|
|
|
|
static inline u32 msg_link_tolerance(struct tipc_msg *m)
|
|
{
|
|
return msg_bits(m, 9, 0, 0xffff);
|
|
}
|
|
|
|
static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
|
|
{
|
|
msg_set_bits(m, 9, 0, 0xffff, n);
|
|
}
|
|
|
|
/*
|
|
* Routing table message data
|
|
*/
|
|
|
|
|
|
static inline u32 msg_remote_node(struct tipc_msg *m)
|
|
{
|
|
return msg_word(m, msg_hdr_sz(m)/4);
|
|
}
|
|
|
|
static inline void msg_set_remote_node(struct tipc_msg *m, u32 a)
|
|
{
|
|
msg_set_word(m, msg_hdr_sz(m)/4, a);
|
|
}
|
|
|
|
static inline int msg_dataoctet(struct tipc_msg *m, u32 pos)
|
|
{
|
|
return(msg_data(m)[pos + 4] != 0);
|
|
}
|
|
|
|
static inline void msg_set_dataoctet(struct tipc_msg *m, u32 pos)
|
|
{
|
|
msg_data(m)[pos + 4] = 1;
|
|
}
|
|
|
|
/*
|
|
* Segmentation message types
|
|
*/
|
|
|
|
#define FIRST_FRAGMENT 0
|
|
#define FRAGMENT 1
|
|
#define LAST_FRAGMENT 2
|
|
|
|
/*
|
|
* Link management protocol message types
|
|
*/
|
|
|
|
#define STATE_MSG 0
|
|
#define RESET_MSG 1
|
|
#define ACTIVATE_MSG 2
|
|
|
|
/*
|
|
* Changeover tunnel message types
|
|
*/
|
|
#define DUPLICATE_MSG 0
|
|
#define ORIGINAL_MSG 1
|
|
|
|
/*
|
|
* Routing table message types
|
|
*/
|
|
#define EXT_ROUTING_TABLE 0
|
|
#define LOCAL_ROUTING_TABLE 1
|
|
#define SLAVE_ROUTING_TABLE 2
|
|
#define ROUTE_ADDITION 3
|
|
#define ROUTE_REMOVAL 4
|
|
|
|
/*
|
|
* Config protocol message types
|
|
*/
|
|
|
|
#define DSC_REQ_MSG 0
|
|
#define DSC_RESP_MSG 1
|
|
|
|
static inline u32 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);
|
|
}
|
|
|
|
|
|
static inline void msg_init(struct tipc_msg *m, u32 user, u32 type,
|
|
u32 err, 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_errcode(m, err);
|
|
if (!msg_short(m)) {
|
|
msg_set_orignode(m, tipc_own_addr);
|
|
msg_set_destnode(m, destnode);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* msg_calc_data_size - determine total data size for message
|
|
*/
|
|
|
|
static inline int msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
|
|
{
|
|
int dsz = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < num_sect; i++)
|
|
dsz += msg_sect[i].iov_len;
|
|
return dsz;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
|
|
static inline int msg_build(struct tipc_msg *hdr,
|
|
struct iovec const *msg_sect, u32 num_sect,
|
|
int max_size, int usrmem, struct sk_buff** buf)
|
|
{
|
|
int dsz, sz, hsz, pos, res, cnt;
|
|
|
|
dsz = msg_calc_data_size(msg_sect, num_sect);
|
|
if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
|
|
*buf = NULL;
|
|
return -EINVAL;
|
|
}
|
|
|
|
pos = hsz = msg_hdr_sz(hdr);
|
|
sz = hsz + dsz;
|
|
msg_set_size(hdr, sz);
|
|
if (unlikely(sz > max_size)) {
|
|
*buf = NULL;
|
|
return dsz;
|
|
}
|
|
|
|
*buf = 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;
|
|
|
|
buf_discard(*buf);
|
|
*buf = NULL;
|
|
return -EFAULT;
|
|
}
|
|
|
|
static inline void msg_set_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
|
|
{
|
|
memcpy(&((int *)m)[5], a, sizeof(*a));
|
|
}
|
|
|
|
static inline void msg_get_media_addr(struct tipc_msg *m, struct tipc_media_addr *a)
|
|
{
|
|
memcpy(a, &((int*)m)[5], sizeof(*a));
|
|
}
|
|
|
|
#endif
|