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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#include <asm/byteorder.h>
23#include <linux/in.h>
24#include <linux/if.h>
25#include <linux/in6.h>
26
27#define ICMP_ECHOREPLY 0 /* Echo Reply */
28#define ICMP_DEST_UNREACH 3 /* Destination Unreachable */
29#define ICMP_SOURCE_QUENCH 4 /* Source Quench */
30#define ICMP_REDIRECT 5 /* Redirect (change route) */
31#define ICMP_ECHO 8 /* Echo Request */
32#define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
33#define ICMP_PARAMETERPROB 12 /* Parameter Problem */
34#define ICMP_TIMESTAMP 13 /* Timestamp Request */
35#define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
36#define ICMP_INFO_REQUEST 15 /* Information Request */
37#define ICMP_INFO_REPLY 16 /* Information Reply */
38#define ICMP_ADDRESS 17 /* Address Mask Request */
39#define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
40#define NR_ICMP_TYPES 18
41
42
43/* Codes for UNREACH. */
44#define ICMP_NET_UNREACH 0 /* Network Unreachable */
45#define ICMP_HOST_UNREACH 1 /* Host Unreachable */
46#define ICMP_PROT_UNREACH 2 /* Protocol Unreachable */
47#define ICMP_PORT_UNREACH 3 /* Port Unreachable */
48#define ICMP_FRAG_NEEDED 4 /* Fragmentation Needed/DF set */
49#define ICMP_SR_FAILED 5 /* Source Route failed */
50#define ICMP_NET_UNKNOWN 6
51#define ICMP_HOST_UNKNOWN 7
52#define ICMP_HOST_ISOLATED 8
53#define ICMP_NET_ANO 9
54#define ICMP_HOST_ANO 10
55#define ICMP_NET_UNR_TOS 11
56#define ICMP_HOST_UNR_TOS 12
57#define ICMP_PKT_FILTERED 13 /* Packet filtered */
58#define ICMP_PREC_VIOLATION 14 /* Precedence violation */
59#define ICMP_PREC_CUTOFF 15 /* Precedence cut off */
60#define NR_ICMP_UNREACH 15 /* instead of hardcoding immediate value */
61
62/* Codes for REDIRECT. */
63#define ICMP_REDIR_NET 0 /* Redirect Net */
64#define ICMP_REDIR_HOST 1 /* Redirect Host */
65#define ICMP_REDIR_NETTOS 2 /* Redirect Net for TOS */
66#define ICMP_REDIR_HOSTTOS 3 /* Redirect Host for TOS */
67
68/* Codes for TIME_EXCEEDED. */
69#define ICMP_EXC_TTL 0 /* TTL count exceeded */
70#define ICMP_EXC_FRAGTIME 1 /* Fragment Reass time exceeded */
71
72/* Codes for EXT_ECHO (PROBE) */
73#define ICMP_EXT_ECHO 42
74#define ICMP_EXT_ECHOREPLY 43
75#define ICMP_EXT_CODE_MAL_QUERY 1 /* Malformed Query */
76#define ICMP_EXT_CODE_NO_IF 2 /* No such Interface */
77#define ICMP_EXT_CODE_NO_TABLE_ENT 3 /* No such Table Entry */
78#define ICMP_EXT_CODE_MULT_IFS 4 /* Multiple Interfaces Satisfy Query */
79
80/* Constants for EXT_ECHO (PROBE) */
81#define ICMP_EXT_ECHOREPLY_ACTIVE (1 << 2)/* active bit in reply message */
82#define ICMP_EXT_ECHOREPLY_IPV4 (1 << 1)/* ipv4 bit in reply message */
83#define ICMP_EXT_ECHOREPLY_IPV6 1 /* ipv6 bit in reply message */
84#define ICMP_EXT_ECHO_CTYPE_NAME 1
85#define ICMP_EXT_ECHO_CTYPE_INDEX 2
86#define ICMP_EXT_ECHO_CTYPE_ADDR 3
87#define ICMP_AFI_IP 1 /* Address Family Identifier for ipv4 */
88#define ICMP_AFI_IP6 2 /* Address Family Identifier for ipv6 */
89
90struct icmphdr {
91 __u8 type;
92 __u8 code;
93 __sum16 checksum;
94 union {
95 struct {
96 __be16 id;
97 __be16 sequence;
98 } echo;
99 __be32 gateway;
100 struct {
101 __be16 __unused;
102 __be16 mtu;
103 } frag;
104 __u8 reserved[4];
105 } un;
106};
107
108
109/*
110 * constants for (set|get)sockopt
111 */
112
113#define ICMP_FILTER 1
114
115struct icmp_filter {
116 __u32 data;
117};
118
119/* RFC 4884 extension struct: one per message */
120struct icmp_ext_hdr {
121#if defined(__LITTLE_ENDIAN_BITFIELD)
122 __u8 reserved1:4,
123 version:4;
124#elif defined(__BIG_ENDIAN_BITFIELD)
125 __u8 version:4,
126 reserved1:4;
127#else
128#error "Please fix <asm/byteorder.h>"
129#endif
130 __u8 reserved2;
131 __sum16 checksum;
132};
133
134/* RFC 4884 extension object header: one for each object */
135struct icmp_extobj_hdr {
136 __be16 length;
137 __u8 class_num;
138 __u8 class_type;
139};
140
141/* RFC 8335: 2.1 Header for c-type 3 payload */
142struct icmp_ext_echo_ctype3_hdr {
143 __be16 afi;
144 __u8 addrlen;
145 __u8 reserved;
146};
147
148/* RFC 8335: 2.1 Interface Identification Object */
149struct icmp_ext_echo_iio {
150 struct icmp_extobj_hdr extobj_hdr;
151 union {
152 char name[IFNAMSIZ];
153 __be32 ifindex;
154 struct {
155 struct icmp_ext_echo_ctype3_hdr ctype3_hdr;
156 union {
157 struct in_addr ipv4_addr;
158 struct in6_addr ipv6_addr;
159 } ip_addr;
160 } addr;
161 } ident;
162};
163#endif /* _UAPI_LINUX_ICMP_H */