/* 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 _LINUX_ICMP_H

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#define _LINUX_ICMP_H

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#include <linux/types.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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#endif /* _LINUX_ICMP_H */

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