/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the ICMP protocol.
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*
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* Version: @(#)icmp.h 1.0.3 04/28/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UAPI_LINUX_ICMP_H
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#define _UAPI_LINUX_ICMP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#define ICMP_ECHOREPLY 0 /* Echo Reply */
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#define ICMP_DEST_UNREACH 3 /* Destination Unreachable */
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#define ICMP_SOURCE_QUENCH 4 /* Source Quench */
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#define ICMP_REDIRECT 5 /* Redirect (change route) */
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#define ICMP_ECHO 8 /* Echo Request */
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#define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
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#define ICMP_PARAMETERPROB 12 /* Parameter Problem */
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#define ICMP_TIMESTAMP 13 /* Timestamp Request */
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#define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
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#define ICMP_INFO_REQUEST 15 /* Information Request */
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#define ICMP_INFO_REPLY 16 /* Information Reply */
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#define ICMP_ADDRESS 17 /* Address Mask Request */
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#define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
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#define NR_ICMP_TYPES 18
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/* Codes for UNREACH. */
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#define ICMP_NET_UNREACH 0 /* Network Unreachable */
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#define ICMP_HOST_UNREACH 1 /* Host Unreachable */
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#define ICMP_PROT_UNREACH 2 /* Protocol Unreachable */
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#define ICMP_PORT_UNREACH 3 /* Port Unreachable */
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#define ICMP_FRAG_NEEDED 4 /* Fragmentation Needed/DF set */
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#define ICMP_SR_FAILED 5 /* Source Route failed */
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#define ICMP_NET_UNKNOWN 6
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#define ICMP_HOST_UNKNOWN 7
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#define ICMP_HOST_ISOLATED 8
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#define ICMP_NET_ANO 9
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#define ICMP_HOST_ANO 10
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#define ICMP_NET_UNR_TOS 11
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#define ICMP_HOST_UNR_TOS 12
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#define ICMP_PKT_FILTERED 13 /* Packet filtered */
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#define ICMP_PREC_VIOLATION 14 /* Precedence violation */
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#define ICMP_PREC_CUTOFF 15 /* Precedence cut off */
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#define NR_ICMP_UNREACH 15 /* instead of hardcoding immediate value */
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/* Codes for REDIRECT. */
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#define ICMP_REDIR_NET 0 /* Redirect Net */
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#define ICMP_REDIR_HOST 1 /* Redirect Host */
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#define ICMP_REDIR_NETTOS 2 /* Redirect Net for TOS */
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#define ICMP_REDIR_HOSTTOS 3 /* Redirect Host for TOS */
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/* Codes for TIME_EXCEEDED. */
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#define ICMP_EXC_TTL 0 /* TTL count exceeded */
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#define ICMP_EXC_FRAGTIME 1 /* Fragment Reass time exceeded */
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struct icmphdr {
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__u8 type;
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__u8 code;
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__sum16 checksum;
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union {
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struct {
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__be16 id;
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__be16 sequence;
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} echo;
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__be32 gateway;
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struct {
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__be16 __unused;
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__be16 mtu;
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} frag;
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__u8 reserved[4];
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} un;
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};
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/*
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* constants for (set|get)sockopt
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*/
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#define ICMP_FILTER 1
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struct icmp_filter {
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__u32 data;
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};
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/* RFC 4884 extension struct: one per message */
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struct icmp_ext_hdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 reserved1:4,
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version:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 version:4,
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reserved1:4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 reserved2;
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__sum16 checksum;
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};
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/* RFC 4884 extension object header: one for each object */
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struct icmp_extobj_hdr {
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__be16 length;
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__u8 class_num;
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__u8 class_type;
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};
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#endif /* _UAPI_LINUX_ICMP_H */
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