include/net/tipc/tipc_msg.h

   1 /*
   2  * include/net/tipc/tipc_msg.h: Include file for privileged access to TIPC message headers
   3  *
   4  * Copyright (c) 2003-2006, Ericsson AB
   5  * Copyright (c) 2005, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  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.
  19  *
  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
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #ifndef _NET_TIPC_MSG_H_
  38 #define _NET_TIPC_MSG_H_
  39
  40 #ifdef __KERNEL__
  41
  42 struct tipc_msg {
  43         __be32 hdr[15];
  44 };
  45
  46
  47 /*
  48                 TIPC user data message header format, version 2:
  49
  50
  51        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
  52       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  53    w0:|vers | user  |hdr sz |n|d|s|-|          message size           |
  54       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  55    w1:|mstyp| error |rer cnt|lsc|opt p|      broadcast ack no         |
  56       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  57    w2:|        link level ack no      |   broadcast/link level seq no |
  58       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  59    w3:|                       previous node                           |
  60       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  61    w4:|                      originating port                         |
  62       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  63    w5:|                      destination port                         |
  64       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  65    w6:|                      originating node                         |
  66       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  67    w7:|                      destination node                         |
  68       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  69    w8:|            name type / transport sequence number              |
  70       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  71    w9:|              name instance/multicast lower bound              |
  72       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  73    wA:|                    multicast upper bound                      |
  74       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  75       /                                                               /
  76       \                           options                             \
  77       /                                                               /
  78       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79
  80 */
  81
  82 #define TIPC_CONN_MSG   0
  83 #define TIPC_MCAST_MSG  1
  84 #define TIPC_NAMED_MSG  2
  85 #define TIPC_DIRECT_MSG 3
  86
  87
  88 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
  89 {
  90         return ntohl(m->hdr[pos]);
  91 }
  92
  93 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
  94 {
  95         return (msg_word(m, w) >> pos) & mask;
  96 }
  97
  98 static inline u32 msg_importance(struct tipc_msg *m)
  99 {
 100         return msg_bits(m, 0, 25, 0xf);
 101 }
 102
 103 static inline u32 msg_hdr_sz(struct tipc_msg *m)
 104 {
 105         return msg_bits(m, 0, 21, 0xf) << 2;
 106 }
 107
 108 static inline int msg_short(struct tipc_msg *m)
 109 {
 110         return (msg_hdr_sz(m) == 24);
 111 }
 112
 113 static inline u32 msg_size(struct tipc_msg *m)
 114 {
 115         return msg_bits(m, 0, 0, 0x1ffff);
 116 }
 117
 118 static inline u32 msg_data_sz(struct tipc_msg *m)
 119 {
 120         return (msg_size(m) - msg_hdr_sz(m));
 121 }
 122
 123 static inline unchar *msg_data(struct tipc_msg *m)
 124 {
 125         return ((unchar *)m) + msg_hdr_sz(m);
 126 }
 127
 128 static inline u32 msg_type(struct tipc_msg *m)
 129 {
 130         return msg_bits(m, 1, 29, 0x7);
 131 }
 132
 133 static inline u32 msg_direct(struct tipc_msg *m)
 134 {
 135         return (msg_type(m) == TIPC_DIRECT_MSG);
 136 }
 137
 138 static inline u32 msg_named(struct tipc_msg *m)
 139 {
 140         return (msg_type(m) == TIPC_NAMED_MSG);
 141 }
 142
 143 static inline u32 msg_mcast(struct tipc_msg *m)
 144 {
 145         return (msg_type(m) == TIPC_MCAST_MSG);
 146 }
 147
 148 static inline u32 msg_connected(struct tipc_msg *m)
 149 {
 150         return (msg_type(m) == TIPC_CONN_MSG);
 151 }
 152
 153 static inline u32 msg_errcode(struct tipc_msg *m)
 154 {
 155         return msg_bits(m, 1, 25, 0xf);
 156 }
 157
 158 static inline u32 msg_prevnode(struct tipc_msg *m)
 159 {
 160         return msg_word(m, 3);
 161 }
 162
 163 static inline u32 msg_origport(struct tipc_msg *m)
 164 {
 165         return msg_word(m, 4);
 166 }
 167
 168 static inline u32 msg_destport(struct tipc_msg *m)
 169 {
 170         return msg_word(m, 5);
 171 }
 172
 173 static inline u32 msg_mc_netid(struct tipc_msg *m)
 174 {
 175         return msg_word(m, 5);
 176 }
 177
 178 static inline u32 msg_orignode(struct tipc_msg *m)
 179 {
 180         if (likely(msg_short(m)))
 181                 return msg_prevnode(m);
 182         return msg_word(m, 6);
 183 }
 184
 185 static inline u32 msg_destnode(struct tipc_msg *m)
 186 {
 187         return msg_word(m, 7);
 188 }
 189
 190 static inline u32 msg_nametype(struct tipc_msg *m)
 191 {
 192         return msg_word(m, 8);
 193 }
 194
 195 static inline u32 msg_nameinst(struct tipc_msg *m)
 196 {
 197         return msg_word(m, 9);
 198 }
 199
 200 static inline u32 msg_namelower(struct tipc_msg *m)
 201 {
 202         return msg_nameinst(m);
 203 }
 204
 205 static inline u32 msg_nameupper(struct tipc_msg *m)
 206 {
 207         return msg_word(m, 10);
 208 }
 209
 210 static inline char *msg_options(struct tipc_msg *m, u32 *len)
 211 {
 212         u32 pos = msg_bits(m, 1, 16, 0x7);
 213
 214         if (!pos)
 215                 return 0;
 216         pos = (pos * 4) + 28;
 217         *len = msg_hdr_sz(m) - pos;
 218         return (char *)&m->hdr[pos/4];
 219 }
 220
 221 #endif
 222
 223 #endif