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 _LINUX_ICMP_H
19#define _LINUX_ICMP_H
20
21#include <linux/types.h>
22#include <asm/byteorder.h>
23#include <linux/if.h>
24#include <linux/in6.h>
25
26#define ICMP_ECHOREPLY 0 /* Echo Reply */
27#define ICMP_DEST_UNREACH 3 /* Destination Unreachable */
28#define ICMP_SOURCE_QUENCH 4 /* Source Quench */
29#define ICMP_REDIRECT 5 /* Redirect (change route) */
30#define ICMP_ECHO 8 /* Echo Request */
31#define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
32#define ICMP_PARAMETERPROB 12 /* Parameter Problem */
33#define ICMP_TIMESTAMP 13 /* Timestamp Request */
34#define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
35#define ICMP_INFO_REQUEST 15 /* Information Request */
36#define ICMP_INFO_REPLY 16 /* Information Reply */
37#define ICMP_ADDRESS 17 /* Address Mask Request */
38#define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
39#define NR_ICMP_TYPES 18
40
41
42/* Codes for UNREACH. */
43#define ICMP_NET_UNREACH 0 /* Network Unreachable */
44#define ICMP_HOST_UNREACH 1 /* Host Unreachable */
45#define ICMP_PROT_UNREACH 2 /* Protocol Unreachable */
46#define ICMP_PORT_UNREACH 3 /* Port Unreachable */
47#define ICMP_FRAG_NEEDED 4 /* Fragmentation Needed/DF set */
48#define ICMP_SR_FAILED 5 /* Source Route failed */
49#define ICMP_NET_UNKNOWN 6
50#define ICMP_HOST_UNKNOWN 7
51#define ICMP_HOST_ISOLATED 8
52#define ICMP_NET_ANO 9
53#define ICMP_HOST_ANO 10
54#define ICMP_NET_UNR_TOS 11
55#define ICMP_HOST_UNR_TOS 12
56#define ICMP_PKT_FILTERED 13 /* Packet filtered */
57#define ICMP_PREC_VIOLATION 14 /* Precedence violation */
58#define ICMP_PREC_CUTOFF 15 /* Precedence cut off */
59#define NR_ICMP_UNREACH 15 /* instead of hardcoding immediate value */
60
61/* Codes for REDIRECT. */
62#define ICMP_REDIR_NET 0 /* Redirect Net */
63#define ICMP_REDIR_HOST 1 /* Redirect Host */
64#define ICMP_REDIR_NETTOS 2 /* Redirect Net for TOS */
65#define ICMP_REDIR_HOSTTOS 3 /* Redirect Host for TOS */
66
67/* Codes for TIME_EXCEEDED. */
68#define ICMP_EXC_TTL 0 /* TTL count exceeded */
69#define ICMP_EXC_FRAGTIME 1 /* Fragment Reass time exceeded */
70
71/* Codes for EXT_ECHO (PROBE) */
72#define ICMP_EXT_ECHO 42
73#define ICMP_EXT_ECHOREPLY 43
74#define ICMP_EXT_CODE_MAL_QUERY 1 /* Malformed Query */
75#define ICMP_EXT_CODE_NO_IF 2 /* No such Interface */
76#define ICMP_EXT_CODE_NO_TABLE_ENT 3 /* No such Table Entry */
77#define ICMP_EXT_CODE_MULT_IFS 4 /* Multiple Interfaces Satisfy Query */
78
79/* Constants for EXT_ECHO (PROBE) */
80#define ICMP_EXT_ECHOREPLY_ACTIVE (1 << 2)/* active bit in reply message */
81#define ICMP_EXT_ECHOREPLY_IPV4 (1 << 1)/* ipv4 bit in reply message */
82#define ICMP_EXT_ECHOREPLY_IPV6 1 /* ipv6 bit in reply message */
83#define ICMP_EXT_ECHO_CTYPE_NAME 1
84#define ICMP_EXT_ECHO_CTYPE_INDEX 2
85#define ICMP_EXT_ECHO_CTYPE_ADDR 3
86#define ICMP_AFI_IP 1 /* Address Family Identifier for ipv4 */
87#define ICMP_AFI_IP6 2 /* Address Family Identifier for ipv6 */
88
89struct icmphdr {
90 __u8 type;
91 __u8 code;
92 __sum16 checksum;
93 union {
94 struct {
95 __be16 id;
96 __be16 sequence;
97 } echo;
98 __be32 gateway;
99 struct {
100 __be16 __unused;
101 __be16 mtu;
102 } frag;
103 __u8 reserved[4];
104 } un;
105};
106
107
108/*
109 * constants for (set|get)sockopt
110 */
111
112#define ICMP_FILTER 1
113
114struct icmp_filter {
115 __u32 data;
116};
117
118/* RFC 4884 extension struct: one per message */
119struct icmp_ext_hdr {
120#if defined(__LITTLE_ENDIAN_BITFIELD)
121 __u8 reserved1:4,
122 version:4;
123#elif defined(__BIG_ENDIAN_BITFIELD)
124 __u8 version:4,
125 reserved1:4;
126#else
127#error "Please fix <asm/byteorder.h>"
128#endif
129 __u8 reserved2;
130 __sum16 checksum;
131};
132
133/* RFC 4884 extension object header: one for each object */
134struct icmp_extobj_hdr {
135 __be16 length;
136 __u8 class_num;
137 __u8 class_type;
138};
139
140/* RFC 8335: 2.1 Header for c-type 3 payload */
141struct icmp_ext_echo_ctype3_hdr {
142 __be16 afi;
143 __u8 addrlen;
144 __u8 reserved;
145};
146
147/* RFC 8335: 2.1 Interface Identification Object */
148struct icmp_ext_echo_iio {
149 struct icmp_extobj_hdr extobj_hdr;
150 union {
151 char name[IFNAMSIZ];
152 __be32 ifindex;
153 struct {
154 struct icmp_ext_echo_ctype3_hdr ctype3_hdr;
155 union {
156 __be32 ipv4_addr;
157 struct in6_addr ipv6_addr;
158 } ip_addr;
159 } addr;
160 } ident;
161};
162#endif /* _LINUX_ICMP_H */