1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for the ICMP protocol.
8 *
9 * Version: @(#)icmp.h 1.0.3 04/28/93
10 *
11 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18 #ifndef _UAPI_LINUX_ICMP_H
19 #define _UAPI_LINUX_ICMP_H
20
21 #include <linux/types.h>
22
23 #define ICMP_ECHOREPLY 0 /* Echo Reply */
24 #define ICMP_DEST_UNREACH 3 /* Destination Unreachable */
25 #define ICMP_SOURCE_QUENCH 4 /* Source Quench */
26 #define ICMP_REDIRECT 5 /* Redirect (change route) */
27 #define ICMP_ECHO 8 /* Echo Request */
28 #define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
29 #define ICMP_PARAMETERPROB 12 /* Parameter Problem */
30 #define ICMP_TIMESTAMP 13 /* Timestamp Request */
31 #define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
32 #define ICMP_INFO_REQUEST 15 /* Information Request */
33 #define ICMP_INFO_REPLY 16 /* Information Reply */
34 #define ICMP_ADDRESS 17 /* Address Mask Request */
35 #define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
36 #define NR_ICMP_TYPES 18
37
38
39 /* Codes for UNREACH. */
40 #define ICMP_NET_UNREACH 0 /* Network Unreachable */
41 #define ICMP_HOST_UNREACH 1 /* Host Unreachable */
42 #define ICMP_PROT_UNREACH 2 /* Protocol Unreachable */
43 #define ICMP_PORT_UNREACH 3 /* Port Unreachable */
44 #define ICMP_FRAG_NEEDED 4 /* Fragmentation Needed/DF set */
45 #define ICMP_SR_FAILED 5 /* Source Route failed */
46 #define ICMP_NET_UNKNOWN 6
47 #define ICMP_HOST_UNKNOWN 7
48 #define ICMP_HOST_ISOLATED 8
49 #define ICMP_NET_ANO 9
50 #define ICMP_HOST_ANO 10
51 #define ICMP_NET_UNR_TOS 11
52 #define ICMP_HOST_UNR_TOS 12
53 #define ICMP_PKT_FILTERED 13 /* Packet filtered */
54 #define ICMP_PREC_VIOLATION 14 /* Precedence violation */
55 #define ICMP_PREC_CUTOFF 15 /* Precedence cut off */
56 #define NR_ICMP_UNREACH 15 /* instead of hardcoding immediate value */
57
58 /* Codes for REDIRECT. */
59 #define ICMP_REDIR_NET 0 /* Redirect Net */
60 #define ICMP_REDIR_HOST 1 /* Redirect Host */
61 #define ICMP_REDIR_NETTOS 2 /* Redirect Net for TOS */
62 #define ICMP_REDIR_HOSTTOS 3 /* Redirect Host for TOS */
63
64 /* Codes for TIME_EXCEEDED. */
65 #define ICMP_EXC_TTL 0 /* TTL count exceeded */
66 #define ICMP_EXC_FRAGTIME 1 /* Fragment Reass time exceeded */
67
68
69 struct icmphdr {
70 __u8 type;
71 __u8 code;
72 __sum16 checksum;
73 union {
74 struct {
75 __be16 id;
76 __be16 sequence;
77 } echo;
78 __be32 gateway;
79 struct {
80 __be16 __unused;
81 __be16 mtu;
82 } frag;
83 __u8 reserved[4];
84 } un;
85 };
86
87
88 /*
89 * constants for (set|get)sockopt
90 */
91
92 #define ICMP_FILTER 1
93
94 struct icmp_filter {
95 __u32 data;
96 };
97
98
99 #endif /* _UAPI_LINUX_ICMP_H */