1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Our own ICMPv4 header declarations, so we have something that's
* portable and somewhat more readable than a typical system header
* file.
*/
#ifndef __ICMP_HEADERS_H__
#define __ICMP_HEADERS_H__
#include "types.h"
/* Most ICMPv6 message types include a copy of the outbound IP header
* and the first few bytes inside, to allow the receiver to demux by
* TCP/UDP port. The following constant specifies the number of bytes
* of TCP header that we will echo. We echo 8 bytes because that
* is the minimum number of bytes that the Linux TCP stack needs to
* read the source and destination TCP port and TCP sequence number,
* which it needs to properly demux an incoming ICMP packet to a
* specific TCP connection.
*/
#define ICMP_ECHO_BYTES 8
struct icmpv4 {
__u8 type;
__u8 code;
__sum16 checksum;
union {
struct {
__be16 id;
__be16 sequence;
} echo;
__be32 gateway;
struct {
__be16 unused;
__be16 mtu;
} frag; /* PMTU discovery, RFC 1191 */
} message;
};
/* Our own ICMP definitions, since the names vary between platforms. */
/* ICMPv4 types */
#define ICMP_ECHOREPLY 0
#define ICMP_DEST_UNREACH 3
#define ICMP_SOURCE_QUENCH 4
#define ICMP_REDIRECT 5
#define ICMP_ECHO 8
#define ICMP_TIME_EXCEEDED 11
#define ICMP_PARAMETERPROB 12
#define ICMP_TIMESTAMP 13
#define ICMP_TIMESTAMPREPLY 14
#define ICMP_INFO_REQUEST 15
#define ICMP_INFO_REPLY 16
#define ICMP_ADDRESS 17
#define ICMP_ADDRESSREPLY 18
#define NR_ICMP_TYPES 18
/* Codes for ICMP_DEST_UNREACH */
#define ICMP_NET_UNREACH 0
#define ICMP_HOST_UNREACH 1
#define ICMP_PROT_UNREACH 2
#define ICMP_PORT_UNREACH 3
#define ICMP_FRAG_NEEDED 4
#define ICMP_SR_FAILED 5
#define ICMP_NET_UNKNOWN 6
#define ICMP_HOST_UNKNOWN 7
#define ICMP_HOST_ISOLATED 8
#define ICMP_NET_ANO 9
#define ICMP_HOST_ANO 10
#define ICMP_NET_UNR_TOS 11
#define ICMP_HOST_UNR_TOS 12
#define ICMP_PKT_FILTERED 13
#define ICMP_PREC_VIOLATION 14
#define ICMP_PREC_CUTOFF 15
#define NR_ICMP_UNREACH 15
#endif /* __ICMP_HEADERS_H__ */
|
