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/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 /* _UAPI_LINUX_ICMP_H */ 163