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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Definitions for the ICMP protocol.
*
* Version: @(#)icmp.h 1.0.3 04/28/93
*
* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _LINUX_ICMP_H
#define _LINUX_ICMP_H
#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/if.h>
#include <linux/in6.h>
#define ICMP_ECHOREPLY 0 /* Echo Reply */
#define ICMP_DEST_UNREACH 3 /* Destination Unreachable */
#define ICMP_SOURCE_QUENCH 4 /* Source Quench */
#define ICMP_REDIRECT 5 /* Redirect (change route) */
#define ICMP_ECHO 8 /* Echo Request */
#define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
#define ICMP_PARAMETERPROB 12 /* Parameter Problem */
#define ICMP_TIMESTAMP 13 /* Timestamp Request */
#define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
#define ICMP_INFO_REQUEST 15 /* Information Request */
#define ICMP_INFO_REPLY 16 /* Information Reply */
#define ICMP_ADDRESS 17 /* Address Mask Request */
#define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
#define NR_ICMP_TYPES 18
/* Codes for UNREACH. */
#define ICMP_NET_UNREACH 0 /* Network Unreachable */
#define ICMP_HOST_UNREACH 1 /* Host Unreachable */
#define ICMP_PROT_UNREACH 2 /* Protocol Unreachable */
#define ICMP_PORT_UNREACH 3 /* Port Unreachable */
#define ICMP_FRAG_NEEDED 4 /* Fragmentation Needed/DF set */
#define ICMP_SR_FAILED 5 /* Source Route failed */
#define ICMP_NET_UNKNOWN 6
#define ICMP_HOST_UNKNOWN 7
#define ICMP_HOST_ISOLATED 8
#define ICMP_NET_ANO 9
#define ICMP_HOST_ANO 10
#define ICMP_NET_UNR_TOS 11
#define ICMP_HOST_UNR_TOS 12
#define ICMP_PKT_FILTERED 13 /* Packet filtered */
#define ICMP_PREC_VIOLATION 14 /* Precedence violation */
#define ICMP_PREC_CUTOFF 15 /* Precedence cut off */
#define NR_ICMP_UNREACH 15 /* instead of hardcoding immediate value */
/* Codes for REDIRECT. */
#define ICMP_REDIR_NET 0 /* Redirect Net */
#define ICMP_REDIR_HOST 1 /* Redirect Host */
#define ICMP_REDIR_NETTOS 2 /* Redirect Net for TOS */
#define ICMP_REDIR_HOSTTOS 3 /* Redirect Host for TOS */
/* Codes for TIME_EXCEEDED. */
#define ICMP_EXC_TTL 0 /* TTL count exceeded */
#define ICMP_EXC_FRAGTIME 1 /* Fragment Reass time exceeded */
/* Codes for EXT_ECHO (PROBE) */
#define ICMP_EXT_ECHO 42
#define ICMP_EXT_ECHOREPLY 43
#define ICMP_EXT_CODE_MAL_QUERY 1 /* Malformed Query */
#define ICMP_EXT_CODE_NO_IF 2 /* No such Interface */
#define ICMP_EXT_CODE_NO_TABLE_ENT 3 /* No such Table Entry */
#define ICMP_EXT_CODE_MULT_IFS 4 /* Multiple Interfaces Satisfy Query */
/* Constants for EXT_ECHO (PROBE) */
#define ICMP_EXT_ECHOREPLY_ACTIVE (1 << 2)/* active bit in reply message */
#define ICMP_EXT_ECHOREPLY_IPV4 (1 << 1)/* ipv4 bit in reply message */
#define ICMP_EXT_ECHOREPLY_IPV6 1 /* ipv6 bit in reply message */
#define ICMP_EXT_ECHO_CTYPE_NAME 1
#define ICMP_EXT_ECHO_CTYPE_INDEX 2
#define ICMP_EXT_ECHO_CTYPE_ADDR 3
#define ICMP_AFI_IP 1 /* Address Family Identifier for ipv4 */
#define ICMP_AFI_IP6 2 /* Address Family Identifier for ipv6 */
struct icmphdr {
__u8 type;
__u8 code;
__sum16 checksum;
union {
struct {
__be16 id;
__be16 sequence;
} echo;
__be32 gateway;
struct {
__be16 __unused;
__be16 mtu;
} frag;
__u8 reserved[4];
} un;
};
/*
* constants for (set|get)sockopt
*/
#define ICMP_FILTER 1
struct icmp_filter {
__u32 data;
};
/* RFC 4884 extension struct: one per message */
struct icmp_ext_hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u8 reserved1:4,
version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
__u8 version:4,
reserved1:4;
#else
#error "Please fix <asm/byteorder.h>"
#endif
__u8 reserved2;
__sum16 checksum;
};
/* RFC 4884 extension object header: one for each object */
struct icmp_extobj_hdr {
__be16 length;
__u8 class_num;
__u8 class_type;
};
/* RFC 8335: 2.1 Header for c-type 3 payload */
struct icmp_ext_echo_ctype3_hdr {
__be16 afi;
__u8 addrlen;
__u8 reserved;
};
/* RFC 8335: 2.1 Interface Identification Object */
struct icmp_ext_echo_iio {
struct icmp_extobj_hdr extobj_hdr;
union {
char name[IFNAMSIZ];
__be32 ifindex;
struct {
struct icmp_ext_echo_ctype3_hdr ctype3_hdr;
union {
__be32 ipv4_addr;
struct in6_addr ipv6_addr;
} ip_addr;
} addr;
} ident;
};
#endif /* _LINUX_ICMP_H */
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