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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 LINUX4 * operating system. INET is implemented using the BSD Socket5 * 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 04/28/9310 *11 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>12 *13 * This program is free software; you can redistribute it and/or14 * modify it under the terms of the GNU General Public License15 * as published by the Free Software Foundation; either version16 * 2 of the License, or (at your option) any later version.17 */18#ifndef _UAPI_LINUX_ICMP_H19#define _UAPI_LINUX_ICMP_H20 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 1840 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 650#define ICMP_HOST_UNKNOWN 751#define ICMP_HOST_ISOLATED 852#define ICMP_NET_ANO 953#define ICMP_HOST_ANO 1054#define ICMP_NET_UNR_TOS 1155#define ICMP_HOST_UNR_TOS 1256#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 4273#define ICMP_EXT_ECHOREPLY 4374#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 184#define ICMP_EXT_ECHO_CTYPE_INDEX 285#define ICMP_EXT_ECHO_CTYPE_ADDR 386#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)sockopt110 */111 112#define ICMP_FILTER 1113 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#else127#error "Please fix <asm/byteorder.h>"128#endif129 __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