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1 office 1 /**
2 * @file arp_proto.h
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * @section DESCRIPTION
30 *
31 * Definitions for the ARP protocol.
32 */
33  
34 #ifndef BADVPN_ARP_PROTO_H
35 #define BADVPN_ARP_PROTO_H
36  
37 #include <stdint.h>
38  
39 #include <misc/packed.h>
40  
41 #define ARP_HARDWARE_TYPE_ETHERNET 1
42  
43 #define ARP_OPCODE_REQUEST 1
44 #define ARP_OPCODE_REPLY 2
45  
46 B_START_PACKED
47 struct arp_packet {
48 uint16_t hardware_type;
49 uint16_t protocol_type;
50 uint8_t hardware_size;
51 uint8_t protocol_size;
52 uint16_t opcode;
53 uint8_t sender_mac[6];
54 uint32_t sender_ip;
55 uint8_t target_mac[6];
56 uint32_t target_ip;
57 } B_PACKED;
58 B_END_PACKED
59  
60 #endif